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US3667304A. Riding lawn mower friction drive. Google Patents

Publication number US3667304A US3667304A US69255A US3667304DA US3667304A US 3667304 A US3667304 A US 3667304A US 69255 A US69255 A US 69255A US 3667304D A US3667304D A US 3667304DA US 3667304 A US3667304 A US 3667304A Authority US United States Prior art keywords roller disc link spring engagement Prior art date 1970-09-03 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired. Lifetime Application number US69255A Inventor Edward W Puffer Howard K Duncan Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Toro Co Original Assignee Outboard Marine Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) 1970-09-03 Filing date 1970-09-03 Publication date 1972-06-06 Priority claimed from US6925570A external-priority 1970-09-03 Application filed by Outboard Marine Corp filed Critical Outboard Marine Corp 1972-06-06 Application granted granted Critical 1972-06-06 Publication of US3667304A publication Critical patent/US3667304A/en 1989-06-06 Anticipated expiration legal-status Critical 1989-06-26 Assigned to LAWN-BOY INC., A CORP OF DELAWARE reassignment LAWN-BOY INC., A CORP OF DELAWARE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: OUTBOARD MARINE CORPORATION, 1994-06-14 Assigned to TORO COMPANY, THE reassignment TORO COMPANY, THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LAWN-BOY INC. Status Expired. Lifetime legal-status Critical Current

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Classifications

A — HUMAN NECESSITIES
A01 — AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
A01D — HARVESTING; MOWING
A01D34/00 — Mowers; Mowing apparatus of harvesters
A01D34/01 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
A01D34/412 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
A01D34/63 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
A01D34/67 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator
A01D34/68 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis hand-guided by a walking operator with motor driven cutters or wheels
A01D34/6806 — Driving mechanisms

A — HUMAN NECESSITIES
A01 — AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
A01D — HARVESTING; MOWING
A01D34/00 — Mowers; Mowing apparatus of harvesters
A01D34/01 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus
A01D34/412 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters
A01D34/63 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis
A01D34/64 — Mowers; Mowing apparatus of harvesters characterised by features relating to the type of cutting apparatus having rotating cutters having cutters rotating about a vertical axis mounted on a vehicle, e.g. a tractor, or drawn by an animal or a vehicle

A — HUMAN NECESSITIES
A01 — AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
A01D — HARVESTING; MOWING
A01D69/00 — Driving mechanisms or parts thereof for harvesters or mowers
A01D69/08 — Clutches

F — MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
F16 — ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
F16H — GEARING
F16H13/00 — Gearing for conveying rotary motion with constant gear ratio by friction between rotary members
F16H13/02 — Gearing for conveying rotary motion with constant gear ratio by friction between rotary members without members having orbital motion

A — HUMAN NECESSITIES
A01 — AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
A01D — HARVESTING; MOWING
A01D2101/00 — Lawn-mowers

Abstract

Disclosed herein is a riding lawn mower including a friction drive comprising a rotatably driven disc mounted on a frame, together with a bracket which supports a roller and which is movable relative to a position locating the roller in driving engagement with the disc and means on the frame for biasing the bracket so as to initially engage the roller with the disc with a first normal force and for subsequently increasing the normal force between the roller and the disc.

Description

[ 1 June6, 1972 [54] RIDING LAWN MOWER FRICTION DRIVE [72] lnventors: Edward W. Puffer, Galesburg; Howard K.

2,942,487 6/1960 Claus.74/197 1,647,413 11/1927 McPherson 74/197 1,492,863 5/1924 Spencer.74/196 Primary E.\’arninerLeonard H. Gerin Attorney-Robert E. Clemency, John W. Michael, Gerritt D. Foster, Robert K. Gerling, Bayard H. Michael, Paul R. Puerner, Joseph A. Gemignani, Andrew 0. Riteris and Spencer B. Michael [5 7] ABSTRACT Disclosed herein is a riding lawn mower including a friction drive comprising a rotatably driven disc mounted on a frame, together with a bracket which supports a roller and which is movable relative to a position locating the roller in driving engagement with the disc and means on the frame for biasing the [56] References cued bracket so as to initially engage the roller with the disc with 21 UNITED STATES PATENTS first normal force and for subsequently increasing the normal force between the roller and the disc. 3,529,482 9/1970 Jackson et a174/197 3,473,622 10/ 1 969 Orr.74/197 X 11 Claims, 5 Drawing Figures.o 24 I ,-/Z 7 I /23.15 4 7 l 1 [I 1 [l0 l ‘1 5 /1 f ‘I w /7 i I [4/ 4f /6/ /l? l t5? ,1 I I.1 11. l

n I l 1 RIDING LAWN MOWER FRICTION DRIVE BACKGROUND OF THE INVENTION The invention relates to friction drives and more particularly to riding lawn mowers or other vehicles including friction drives. In this regard, certain prior lawn mowers have included friction drives of the type including a driving disc which is rotated in a fixed plane by an engine and a driven roller which is movable relative to the disc in directions both forward and away from the disc and along a path which is generally diametrically arranged relative to the disc.

Accordingly, when the roller is engaged with the disc, the roller is rotated by the disc, and power transmission occurs. Disengagement of the roller from the disc serves to discontinue power transmission from the disc to the roller and rotation of the roller ceases. Still further, when the roller is engaged with the disc on any point on one side of the rotational axis of the disc, the drive roller rotates in one direction and when the roller is located in engagement with the disc on the other side of the rotational axis of the disc, the roller rotates in the other direction. Varying the radial distance of the engagement of the roller with the disc from the rotational axis of the disc serves to vary the speed of rotation of the roller with respect to any given disc speed.

Prior constructions have included an operating control lever which was operative to actuate a friction drive of the type above explained between three separate forward drive speed conditions, a neutral condition, and a reverse drive condition. The arrangement was such that when in a neutral condition, the control lever served to disengage the roller from the disc, and while in the forward drive and reverse drive conditions, the roller was biased into engagement with the disc by a spring.

The prior constructions also included a foot operated control link which was operative, when depressed by the operator, to disengage the roller from the driving disc whenever the control lever was in any one of the three forward speed conditions. Thus, in the prior constructions it was possible to disengage the roller from the disc by shifting the control lever to neutral or by depressing a foot pedal whenever the control lever was in any one of the forward drive conditions. Engagement of the roller with the driving disc occurred whenever the control lever was shifted to a drive position or whenever pressure on the foot pedal was relieved in response to the action of the before mentioned spring.

The spring biasing the roller into engagement with the driving disc of the previous constructions was sufficiently strong to maintain engagement during travel over rough terrain and could cause relatively Rapid engagement of the roller with the disc. Particularly at high forward speed conditions, as well as in other drive conditions, such Rapid engagement sometimes could cause relatively quick acceleration. As a consequence, some prior constructions did not enjoy the smoothness of operation as is provided by the construction disclosed hereinafter.

SUMMARY OF THE INVENTION The invention provides a friction drive which is arranged to provide smooth engagement of a rubber wheel or roller with a disc driven by an engine, thereby avoiding unevenness of operation and providing improved control.

A principal object of the invention is the provision of a friction drive including means for biasing a driven roller into engagement with a driving disc with a first normal force and for subsequently increasing the normal force between the roller and the disc to increase effective power transmission through the friction drive and, at the same time, to provide smooth acceleration and control.

Another principal object of the invention is the provision of a riding lawn mower having a friction drive arrangement including a first spring for biasing a roller supporting bracket into a position locating the roller in engagement with the disc, together with a second spring which is operable to increase the normal force between the roller and the disc after initial engagement of the roller with the disc under the influence of the first spring. Preferably the second spring has a spring rate greater than the spring rate of the first spring.

In this last regard, and in accordance with the invention, the riding mower includes a clutch pedal which is movable to a depressed condition and which is connected to a link having a lost motion connection with the bracket supporting the roller. particularly, the link is also connected to the heavy or second spring and is movable relative to the bracket between a first position affording an increase in the bias of the engagement of the roller with the disc under the influence of the heavy spring, and a second position affording movement of the link, in response to foot pedal depression, in the direction effecting movement of the bracket away from the position locating the roller in engagement with the disc and in opposition to the first and second springs. Thus, the heavy spring is connected between the frame and the link so as to urge the link (when the foot pedal is not depressed) to the first position and to increase the bias of the engagement of the roller with the disc and so as to oppose movement of the link when the foot pedal is depressed) from the first position to the second position and to oppose movement of the bracket away from the position locating the roller in engagement with the disc.

Still another principal object of the invention is the provision of a friction drive including a roller which is movable relative to a driving disc and which is provided with an annular weight to increase the inertia of the roller so as to provide smooth starts and smooth continuous power delivery, notwithstanding rough terrain, changes in torque transmission requirements, and any eccentricity which may be present in the roller.

Another object of the invention is the provision of a riding lawn mower which includes an improved friction drive and which will provide a long and useful life.

Still another object of the invention is the provision of a riding mower having a friction drive afiording smoother operation than available in prior machines.

Other objects and advantages of the invention will become known by reference to the following description and accompanying drawings.

DRAWINGS FIG. 1 is a partially broken away, side elevational view of a lawn mower embodying various of the features of the inventron.

GENERAL DESCRIPTION Shown in the drawings is a riding lawn mower 11 which includes a friction drive arrangement 13 (see FIG. 2) embodying various of the features of the invention. specifically,

the lawn mower 11 includes (see FIG. 1) a steerable pair of front wheels 17 and a pair of power driven rear wheels 19 supporting a frame 21 which carries a cutter blade housing 23 intermediate the front and rear wheels. Located rearwardly on the frame 21 is an engine 27 (shown schematically) which powers the rear wheels 19 through the friction drive arrangement 13 of the invention. A control lever 29 movable between three forward speed positions, a neutral position, and one reverse speed position is mounted on the frame 21 and connected to the friction drive arrangement 13. Located on the frame 21 in front of the engine 27 is a seat 31 for the operator.

The front wheels 17 are steerable by a manually operated drive handle 33. In addition, a foot operated clutch pedal 37,

as well as a foot operated brake pedal (not shown) are provided adjacent the front end of the frame 21. In this last regard, the brake foot pedal, when depressed, serves to brake the rear wheels 19 and the clutch foot pedal 37, when depressed, serves to disengage the friction drive arrangement 13. Thus, when the lawn mower is operating in forward drive, depression of both the clutch and foot pedals serves to disengage the drive from the engine 27 to the rear wheels 19 and to simultaneously brake rotation of the rear wheels 19.

The friction drive arrangement 13 comprises a driving disc 41 which is mounted on the frame 21 for rotation by the engine 27 in a fixed generally horizontal plane. Movable relative to positions of engagement with the driving disc is a wheel or roller 43 which preferably has an outer surface of rubber or like material 47 mounted on an annular flange 49 of an otherwise disc-like member 51. In addition, the roller 43 is carried for axial movement on and for common rotation with an axle or shaft 53 rotatably supported by bearings 57 on the opposed legs 59 of a u-shaped bracket 61. In turn, the bracket 61 is unitarily fixed toa sleeve 63 which is journaled for pivotal movement on and relative to a cross shaft 67 rotatably mounted, at its ends, in bearings 69 supported on the frame 21. From the foregoing, the roller 43 is movable into and out of engagement with the driving disc 41 in accordance with the pivotal movement of the bracket 61 and sleeve 63 relative to the cross shaft 67.

The roller 43 is shiftable transversely of the axle 53 by the control lever 29 to provide three forward speed conditions, one neutral condition, and one reverse drive condition by a linkage 71 which includes, at least in part, a collar 73 (See FIG. 4) rotatably mounted relative to a hub 77 on the roller member 51. Pivotally connected to the collar 73 at the diametrically opposite portions thereof are respective links 79 and 81 which are individually pivotally connected to a pair of lever arms 83 and 87 integrally extending (See FIG. 3) from a unitary bell crank 89 including a shaft 88 which connects the lever arms 83 and 87 and which is pivotally mounted transversely of the axle 53 on the connecting web 93 of the U-shaped bracket 61. The bell crank 89 also includes a third arm 97 connected by a universal joint 99 (See FIG. 2) to an actuating rod 111 operable by the control lever 29. Accordingly, control lever movement is operable to shift the roller 43 axially of the axle 53 and relative to the driving disc 41 so as to locate the roller 43, when in the neutral position, in alignment with the rotational axis of the disc 41 and to provide three forward drive roller locations spaced radially with respect to the disc 41 and axially of the axle 53on one side of the neutral position and to provide one rearward drive roller location spaced radially of the disc 41 and axially of the axle 53 on the other side of the neutral position.

In accordance with the invention, means are provided for biasing the roller carrying bracket 61 to a position locating the roller 43 in engagement with the disc 41. As will be further described herein, such means includes a first or light spring l 13 connected, at one end, to a stud 117 on the rearward por-tion of the frame 21 and connected, at its forward end, to a stud 119 extending from an ear or tab 121 fixedly extending from one of the legs 59 of the U-shaped bracket 61 so as to urge the U-shaped bracket 61 in the counterclockwise direction as shown in FIG. 2 to engage the roller 43 with the disc 41. As will be further explained, the means for biasing the roller 43 into engagement with the disc 41 also includes a second spring 123 which has a heavier action than the first spring 113, i.e., for instance, the spring 123 can have a greater spring rate than the spring 113, and which, like the first spring 113 is connected, at its rearward end, to a stud 127 extending from the frame 21 and, at its forward end, as will be explained, to the ear or tab 121.

The studs 117 and 127 extend respectively from separate brackets 118 and 128 which are adjustably fixed on the frame 21 through respective bolted connections so as to permit swinging of the brackets 118 and 128 about the bolted connections to afford adjustment of the tensions in the springs 113 and 123 to provide action in accordance with the invention. Any suitable means can be employed to retain connection of the springs 113 and 123 to the studs 117, 119, and 127 and, as will be explained, to a bent end portion 139 of a rod or link 137.

The control arrangement for the friction drive 13 further includes means operable by the control lever 29 to pivot the U shaped bracket 61 in the clockwise direction (as shown in FIG. 2) so as to disengage the roller 43 from the disc 41. In

this last regard, the sleeve 63 has extending therefrom a fixed arm 129 having, at its outer end, a slot 131. Extending into the slot 131 is an actuating rod 133 which is regulated by the control lever 29 and which is located such that the rod 133 engages the forward end of the slot 131 to pivot the U-shaped bracket 61 in the clockwise direction (as shown in FIG. 2) to disengage the roller 43 from the disc 41 whenever the control lever 29 is in neutral position. When the control lever 29 is shifted from neutral to either of the forward or rearward drive positions, the actuating rod 133 moves rearwardly, permitting the springs 1 13 and 123 to pivot the U-shaped bracket 61 into position engaging the roller 43 with the disc 41.

In addition to the foregoing, as has already been noted, the U-shaped bracket 61 can be swung, in the clockwise direction as shown in FIG. 2, to disengage the roller 43 from the disc 41 by another actuating rod or link 137 which is movable rearwardly and forwardly of the frame and is connected, at its forward end, to the clutch foot pedal 37. At its rearward end, the actuating link 137 is connected to the ear or tab 121 on the U- shaped bracket 61 in such manner so as to afford the advantages of the invention.

In this last regard, and in accordance with the invention, means are provided, when engaging the friction drive arrangement 13 by relieving pressure on the clutch foot pedal 37, for initially engaging the roller 41 with the disc 43 with a relatively small normal force and for subsequently engaging the roller 43 with the disc 41 with a heavier normal force. As a result, some initial slippage is permitted between the roller 43 and the disc 41 to avoid immediate full transmission of power through the friction drive 13 while nevertheless transmitting sufficient power to start the vehicle moving from a non-moving condition in such manner as to provide smooth acceleration and control. The subsequent application of a greater normal force engaging the roller 43 with’ the disc 41 serves to substantially eliminate slippage and to afi’ord full power transmission which occurs more smoothly than if immediate full power transmission occurs through the friction drive arrangement.

Thus, inv accordance with the invention, the second or heavier spring 123 is connected, at its forward end, to a bent end portion 139 of the clutch foot pedal actuating link 137 and’the clutch foot actuating link 137 is connected to the ear 121 by a lost motion arrangement including a fore and aft slot 141 (See FIG. 3) in the ear or tab 121 and projection of the bent end portion 139 of the clutch foot pedal actuating link 137 through the slot 141. Thus, the clutch foot pedal actuating link 137 is biased by the heavy spring 123 toward a position at the rearward end of the slot 141, which biasing action serves to augment the normal force applied by the lighter spring 113 to engage the roller 43 with the disc 41.

The link 137 is movable forwardly incident to initial depression of the clutch foot pedal 37 and in opposition to the heavy spring 123 to a position at the forward end of the slot 141, which position is efiective to swing the U-shaped bracket 61 in a clockwise direction, as shown in FIG. 2, to disengage the roller 43 from the disc 41 in response to continued forward movement of the actuating link 137 occurring incident to continued depression of the clutch foot pedal 37.

Upon gradual release of the clutch foot pedal 37, the heavy spring 123 urges the actuating link 137 rearwardly, thereby permitting counterclockwise pivoting of the U-shaped bracket 61 in response to the action of the light spring 113 into a position engaging the roller 43 with the disc 41 with a relatively light normal force so as to afford partial power transfer and sufficient slippage to provide smooth acceleration. As pressure on the clutch foot pedal 37 is fully removed, and after initial engagement of the roller 43 with the disc 41 in response to the action of the light spring 1 13, the heavy spring 123 causes the bent end portion 139 of the actuating link 137 to move to the rear end of the slot 131. Upon engagement of the bent end portion 139 with the rearward end of the slot 131, the biasing action of the heavier spring 123 serves to bias the U-shaped bracket 61 so as to increase the pressure of the engagement between the roller 43 and the disc 41 to avoid material slippage and to obtain full power transfer.

Accordingly, upon release of pressure on the clutch foot pedal 37, the roller 43 is first slightly engaged with the disc 41 to permit partial power transfer with some slippage by reason of the action of the light spring 1 l3 and thereafter the pressure of the engagement of the roller 43 with the disc 41 is increased by the heavier spring 123 to avoid slippage between the disc 41 and the roller 43 and to obtain full power transfer in a smooth operation withoutjumpiness.

Also in accordance with the invention, the roller 43 is provided with a weight or flywheel in the nature of an inner annular ring or member 151 underlying the annular flange 49 and connected to the disc-like member 51. Accordingly, the ring rotates with the roller 43 and adds an initial rotating inertial load as the roller 43 is engaged with the disc 41. This initial inertial load is effective, as the roller 43 begins to rotate under the action of the spring 113, to create slippage between the roller 43 and the driving disc 41 so as to enhance smooth starting. In addition, the annular ring or weight 151 serves to prevent slippage between the disc 41 and the roller 43 under full speed operating conditions due to the inertial action of the rotating weight or annular ring 151.

Power can be delivered from the axle 53 driven by the roller 43 to the rear drive wheels 19 in any suitable fashion. Thus, in the disclosed construction, the axle 53 includes a sprocket 161 which is connected by a chain 163 to another sprocket 167 on the cross shaft 67 which additionally carries still another sprocket 169 which ultimately drives the rear wheels 19 through another chain drive 171 only partially shown.

A riding lawn mower including a friction drive comprising a frame, a rotatably driven disc mounted on said frame, a roller adapted to be driven by said disc, means on said frame mounting said roller for movement relative to a position locating said roller in driving engagement with said disc, first spring means connected to said frame and to said roller mounting means for biasing said roller mounting means into said position locating said roller in engagement with said disc, link means mounted on said frame for moving said roller mounting means away from said position locating said roller in engagement with said disc, and second spring means connected between said link means and said frame and operable independently of said first spring means to oppose operation of said link means to move said roller mounting means away from said position and, when said roller mounting means is in said position, to increase the bias of the engagement of said roller with said disc beyond the engagement of said roller with said disc provided by the action of said first spring means.

A riding lawn mower in accordance with claim 1 wherein said second spring means has a higher spring rate than the spring rate of said first spring means.

Field Comparison: Swathers, Drum Mowers, and Disc Mowers

a second position affording movement of said link in the direction effecting movement of said roller mounting means away from said position locating said roller in engagement with said disc and in opposition to said first and second spring means. i

A riding lawn mower in accordance with claim 4 including other means for moving said means mounting said roller away from said position engaging said roller with said disc.

A riding lawn mower in accordance with claim 4 and further including a foot pedal mounted on said frame for movement to a depressed position and connected to said link to cause said link to move in opposition to the bias of said second spring means upon depression of said foot pedal.

A friction drive comprising a frame, a rotatably driven disc mounted on said frame, a roller adapted to be driven by said disc, means on said frame mounting said roller for movement relative to a position locating said roller in driving engagement with said disc, means on said frame including first and second sequentially and simultaneously operable springs for biasing said roller mounting means so as to initially engage said roller with said disc with a first normal force and for subsequently increasing the normal force between said roller and said disc.

A friction drive in accordance with claim 7 wherein said first spring is connected to said frame and to said roller mounting means for biasing said roller mounting means into said position locating said roller in engagement with said first disc and said second spring is connected between said frame and said roller mounting means for subsequently increasing the normal force between said roller and said disc after initial engagement of said roller with said disc under the influence of said first spring.

A friction drive in accordance with claim 8 wherein said second spring has a spring rate greater than the spring rate of said first spring.

A friction drive in accordance with claim 8 wherein said means for initially engaging said roller with said disc with a first normal force and for subsequently increasing the normal force between said roller and said disc also includes an actuating link, means connecting said link and saidroller mounting means and providing lost motion of said link relative to said roller mounting means between a first position affording an increase in the bias of the engagement of said roller with said disc in response to the action of said second spring, and a second position affording movement of said link in the direction effecting movement of said roller mounting means away from said position locating said roller in engagement with said disc and in opposition to said first and second springs, and said second spring is connected between said frame and said link to urge said link to said first link position and increase the bias of the engagement of said roller with said disc and to oppose movement of said link from said first position to said second position and movement of said roller mounting means away from said position locating said roller in engagement with said disc.

Claims ( 11 )

A riding lawn mower including a friction drive comprising a frame, a rotatably driven disc mounted on said frame, a roller adapted to be driven by said disc, means on said frame mounting said roller for movement relative to a position locating said roller in driving engagement with said disc, first spring means connected to said frame and to said roller mounting means for biasing said roller mounting means into said position locating said roller in engagement with said disc, link means mounted on said frame for moving said roller mounting means away from said position locating said roller in engagement with said disc, and second spring means connected between said link means and said frame and operable independently of said first spring means to oppose operation of said link means to move said roller mounting means away from said position and, when said roller mounting means is in said position, to increase the bias of the engagement of said roller with said disc beyond the engagement of said roller with said disc provided by the action of said first spring means.

A riding lawn mower in accordance with claim 1 wherein said second spring means has a higher spring rate than the spring rate of said first spring means.

A riding lawn mower in accordance with claim 1 wherein said link means includes an actuating link connected to said second spring means to urge said link to a first link position, means connecting said link and said roller mounting means and providing lost motion of said link relative to said roller mounting means between said first position which affords an increase in the bias of the engagement of said roller with said disc in response to the action of said second spring means, and a second position affording movement of said link in the direction effecting movement of said roller mounting means away from said position locating said roller in engagement with said disc and in opposition to said first and second spring means.

A riding lawn mower in accordance with claim 4 including other means for moving said means mounting said roller away from said position engaging said roller with said disc.

A friction drive comprising a frame, a rotatably driven disc mounted on said frame, a roller adapted to be driven by said disc, means on said frame mounting said roller for movement relative to a position locating said roller in driving engagement with said disc, means on said frame including first and second sequentially and simultaneously operable springs for biasing said roller mounting means so as to initially engage said roller with said disc with a first normal force and for subsequently increasing the normal force between said roller and said disc.

A friction drive in accordance with claim 8 wherein said second spring has a spring rate greater than the spring rate of said first spring.

A friction drIve in accordance with claim 8 wherein said means for initially engaging said roller with said disc with a first normal force and for subsequently increasing the normal force between said roller and said disc also includes an actuating link, means connecting said link and said roller mounting means and providing lost motion of said link relative to said roller mounting means between a first position affording an increase in the bias of the engagement of said roller with said disc in response to the action of said second spring, and a second position affording movement of said link in the direction effecting movement of said roller mounting means away from said position locating said roller in engagement with said disc and in opposition to said first and second springs, and said second spring is connected between said frame and said link to urge said link to said first link position and increase the bias of the engagement of said roller with said disc and to oppose movement of said link from said first position to said second position and movement of said roller mounting means away from said position locating said roller in engagement with said disc.

ID=22087739

Family Applications (1)

Application Number Title Priority Date Filing Date

US69255A Expired. Lifetime US3667304A ( en )

1970-09-03

Riding lawn mower friction drive

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US4173153A ( en )	1977-05-17	1979-11-06	J. I. Case Company	Friction disc transmission
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US20060213703A1 ( en )	2002-04-10	2006-09-28	Long Thomas W	Vehicle drive system with energy recovery system and vehicle mounting same
US20080083206A1 ( en )	2006-10-06	2008-04-10	Miguel Gerardo Verduzco	Gearless rotary vegetation cutter
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US5615540A ( en )	1995-03-04	1997-04-01	Yang; Chen-Chi	Electricity driven device and method for increasing the rotational inertia of a rotary object or the blade of a lawn mower
US6591593B1 ( en )	2000-10-23	2003-07-15	Dennis Brandon	Electric riding lawn mower powered by an internal combustion engine and generator system
US6717281B1 ( en )	2000-10-26	2004-04-06	Dennis Brandon	Electric generator and motor drive system
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US6856035B2 ( en )	2000-10-26	2005-02-15	Dennis Brandon	Electric generator and motor drive system
US6502335B2 ( en )	2001-03-16	2003-01-07	Ariens Company	Friction drive cable shifter
US20030221882A1 ( en )	2002-04-10	2003-12-04	Thomas Long	Vehicle drive system with energy recovery system and vehicle mounting same
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US20080083206A1 ( en )	2006-10-06	2008-04-10	Miguel Gerardo Verduzco	Gearless rotary vegetation cutter
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US9307696B2 ( en )	2010-06-16	2016-04-12	Husqvarna Ab	Lawn mower with a dual-tubular frame
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Legal Events

Owner name: LAWN-BOY INC., A CORP OF DELAWARE, WISCONSIN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:OUTBOARD MARINE CORPORATION,;REEL/FRAME:005277/0255

Effective date: 19900619

Owner name: TORO COMPANY, THE, MINNESOTA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LAWN-BOY INC.;REEL/FRAME:007029/0339

Effective date: 19940318

Disc mowers

The SL mower is rugged, compact and of low construction. Ideal for young plantations with low-hanging fruit. The new precision control allows accurate and gentle sensing of the tree trunk which cannot be damaged thanks.

disc mower RI 60, RI 80

Working width: 0.6, 0.8 m

blades that mow the grass. The blades are guarded by an anti-scalp disc that prevents the blades to mow into the ground. The spring-suspension on the Ø 60 or 80 cm large barrier mower can be continuously.

disc mower REGGIO series

Working width: 6, 9, 12 m

Working machines applied frontally to the tractor, operated by hydraulic power supply and equipped with one or more cutting units. ADVANTAGES Machine suitable for weeds in biological cultures, to avoid the use of chemical herbicides

disc mower LSM 740

Working width: 800 mmPTO speed: 3,500 rpmWeight: 100 kg

The LSM 740 guiding post mower is meant for mowing out guiding posts, safety devices and traffic signs. Two sensor-controlled mowing discs are guided precisely and ensure all-round clean mowing results.

disc mower 16 Max

Working width: 1.45 m

A finish without equal, the 16 Max mowing head is ideally suitable for mowing verges immediately next to the highway. Spoon type flails which are fitted to the rotors assure an exceptional discharge of vegetation, with the same performance.

disc mower

Working width: 1,000 mm

Rear rotational Mower designed as tractor connection. TEHNICAL INFORMATION Working grip. 1000 mm Knife carrier. 1 Number of flying knives. 2 Input revolutions. 540. 800 rev/min Connection. 3 point connection Options.

disc mower T-DCBM series

Working width: 1,626, 2,006, 2,386 mmPower required: 40, 50, 60 chPTO speed: 540 rpm

Minos Rotary Disc Mower is the MOST IDEAL machine type especially for the feed plants growing horizontally such as vetch, white clover, Lotus corniculatus and for reaping all kinds of meadow, pasture.

disc mower FCS 320

Working width: 3.1 m

mistreating the crops and the ground. The cutting system has a working width of 3.10 Mt and is composed of n ° 8 two-blade discs designed with a particular profile to ensure a perfect cut with short and long products.

disc mower

Inter.stump lawn-mower wheel to be applied to shredder for pruning the stem without damaging the dark Serial Features.Inter-row wheel with reentry spring.Hydraulic engine.Hydraulic hoses with quick release couplings

disc mower DM series

Working width: 2.85, 2.45, 3.23, 2.05, 1.67 mPower required: 35, 40, 46, 52, 56 chPTO speed: 540 rpm

This SITREX mowers range, including 4. 5. 6. 7. discs machines, fits the requirements of small and large farms. The DM4 Disc mower, with 4 discs.

disc mower JF 1650 T

Working width: 1,650 mm

self-cleaning cutting system allows the mower to work on laid down and wet forage, keeping the drums rotation free. Another important feature is the safety device automatically activated whenever an obstacle is hit. JF.

disc mower RTMN-FTS

NUMBER OF DISCS kg: 4-5-6-7 OPTION: SQUEEZING ROLLER

disc mower COMBI-D580, COMBI-D580GM

Working width: 5.8 mPower required: 100, 120 chPTO speed: 1,000 rpm

The COMBI-D580 and COMBI-D580GM combined mowers consist of three mowing elements with 5 discs, one frontal and two lateral, for front linkage to a tractor with front P.T.O. The strength of the combined.

disc mower MDN Series

Working width: 2.1, 2.45, 2.85 mPower required: 30, 36, 40 kWPTO speed: 540 rpm

COMPONENTS. Cutting discs and blades are easily accessible by removing six bolts and the sturdy cover to reveal the inner workings of each disc assembly. Tractors ranging in horsepower from 40 to 50.

disc mower Rotex 70

Power required: 10.2 ch

Rotex 70 perfect for maintenance without loss of time of rustic land, brushwood, uncultivated areas or industrial. The sharp blade cuts perfectly the stem of grass, shrubs and brushwood depositing them on the ground evenly over the entire.

disc mower F series

Working width: 2.4, 1.75, 1.9, 2.8, 3 mWeight: 350 kg. 790 kg

disc mower ZRF80

Working width: 80 cm

Working width 80cm High passage, 3 blades per rotor. Width with guard 123 cm. Weight:68 kg Attachment Width:80 cm Acronym:ZRF

disc mower SP-60

The 60 cm wide SP-60 is our smallest and most agile, yet powerful bush cutter that makes mowing a breeze. Based on the patented spiral cutting system, the JAK brush cutter is a versatile and efficient solution to various applications. Thanks.

drum mower ZNTRM series

Working width: 135, 165, 185 cm

Mostly Designed for smaller and middle farms. One of the Most durable designs for Hay Harvesting Mowers. Quick and simple Replacement of blades. Low power Requirements. All in Excellent mowing.

disc mower ZILLA

Working width: 1,016 mm

two blades are attached to the ends of the rotor through angular gear. The lawn mower is based on four running wheels in their swivel casings. The body of the mower can be mounted on the drive chassis.

disc mower KS-220R

Working width: 2.2 m

and trees is one of the care treatment, which you have to regularly repeat on your plantations or in your orchard. KS 220R mower-shredder eliminates the necessity of using herbicides. It can be also used for destroying.

disc mower MF DM M series

Working width: 1.66 m. 9.6 mPower required: 26 ch. 95 chPTO speed: 540, 1,000 rpm

FARMER SERIES. F Ideally suited to farmers with lower horsepower tractors or a limited amount of mowing to carry out, these mowers boast a host of features you would expect to find on larger, more expensive machines. PTO.

disc mower 800, 1000

Working width: 80, 100 cmPTO speed: 3,000 rpmWeight: 370, 541 kg

pulverizing pieces of post-harvest stems and branches on vineyards, orchards, gardens and small fields. Can be used as weed mower if needed. Shreds and mixes the unwanted pieces of stems and branches with soil on.

disc mower R72H

Working width: 72, 84 inPower required: 40 ch. 85 chWeight: 890, 1,075 lb

For 30 years, LuckNow rotary mowers have been know as one of the heaviest rough cut rotary mowers available on the market. Available in 72” 84 cutting width models. Ideal for clearing grass, weeds.

disc mower

Working width: 3 m

Chassis: made in a tubular reinforced structure Width of work: 3m Longitudinal Transport: 2,40m Transmission: from tractor’s PTO connected with the machine by means of a PTO shaft. That shaft is directly connected to a gearbox which drives.

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How to set up a KRONE disc mower

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DM50 DISC MOWER

DM50 Series float spring tension adjustment

Set the float spring to get maximum performance during operation. Adjust properly so the down pressure does not damage crop stubble as the skid shoes pass through the field.

Park stand and arm system

Park stand in park position

Park stand in operating position

The DM50 Series Disc Mower park stand and parking arm work together to transfer the mower’s weight to the cutterbar while in the parked position. This makes the attachment process easier, saving time and frustration.

Park arm in park position

Park arm in operating position

Shear hub assembly serviceability

Oval-shaped disc removed

Cutterbar serviceability is easier on the DM50 Series Disc Mowers. Remove the oval-shaped disc(s) with only four bolts per disc. The shear hub assembly can be serviced by removing the remaining four bolts. This will save time and oil replacement costs by not splitting the entire cutterbar to replace the sheared hubs as required in previous models.

Shear hub assembly on DM50 Series

Take the shear hub assembly off the cutterbar by removing only eight bolts.

Transport lock system

DM50 in transport position

DM50 in operating position

The transport lock system is a simple mechanical system that saves time and ensures safety. Use the rope system to raise the transport lock, engage selective control valve (SCV) 1 to bring the cutterbar into the transport position, and release the rope system to lock for transport.

Outer swath wheel

Add the outer swath wheel to the DM50 Series Disc Mower to achieve separation between cut and uncut crop. By keeping the cut crop out of the uncut crop, cutting is not happening twice, which would reduce overall productivity. The swath wheel is fully adjustable up and down the length of the cutterbar, and it bolts directly to the top frame with U-bolts.

Specifications

Compare the specifications of up to 4 models

Dimensions dm50-disc-mower Current Model Cutting widthSwath widthOperation of cutting anglePer machineShipping (1 unit and crate)CategoryTypeQuantityrpm

2.36 m7.7 ft

1.75 m5.7 ft

/- 25 degree (angle)

442 kg975 lb

998 kg2,200 lb

Category 1, Category 2. iMatch and Quick-Coupler compatible

3-point

Six

3,000 rpm

Sources:

https://patents.google.com/patent/US3667304A/en
https://www.agriexpo.online/agricultural-manufacturer/disc-mower-1268-_3.html
https://rands.com/agriculture-equipment/HayForage-Equipment/Disc-Mowers/dm50-disc-mower

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US3667304A. Riding lawn mower friction drive. Google Patents

Links

Images

Classifications

Abstract

Description

Field Comparison: Swathers, Drum Mowers, and Disc Mowers

Claims ( 11 )

ID=22087739

Family Applications (1)

Cited By (16)

Patent Citations (5)

Cited By (22)

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Disc mowers

disc mower RI 60, RI 80

disc mower REGGIO series

disc mower LSM 740

disc mower 16 Max

disc mower

disc mower T-DCBM series

disc mower FCS 320

disc mower

disc mower DM series

disc mower JF 1650 T

disc mower RTMN-FTS

disc mower COMBI-D580, COMBI-D580GM

disc mower MDN Series

disc mower Rotex 70

disc mower F series

disc mower ZRF80

disc mower SP-60

drum mower ZNTRM series

disc mower ZILLA

disc mower KS-220R

disc mower MF DM M series

disc mower 800, 1000

disc mower R72H

disc mower

How to set up a KRONE disc mower

DM50 DISC MOWER

Park stand and arm system

Shear hub assembly serviceability

Transport lock system

Outer swath wheel

Specifications