Garden tractor |
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| 申请号 | US3661212D | 申请日 | 1970-10-22 | 公开(公告)号 | US3661212A | 公开(公告)日 | 1972-05-09 |
| 申请人 | FRED LEE JOHNSON; | 发明人 | JOHNSON FRED LEE; | ||||
| 摘要 | An engine and transmission assembly, within a traction wheel, is suspended by hollow trunnions on which the traction wheel is journalled. An inverted U-shaped yoke, fixed to the trunnions, straddles the wheel and combined draft, stabilizing and steering means connect the yoke to an implement frame for relative tilting about a fore-and-aft axis and for steering the wheel relative to the frame. A reaction member is universally pivoted to the top of the yoke and is connected to the implement frame. Articulated controls for the engine and transmission extend from the implement frame through the hollow trunnions. | ||||||
| 权利要求 | 1. A garden tractor comprising: an implement frame; a traction wheel forwardly of said implement frame and having a power source suspended therein about the axis of said wheel and drivingly connected to said wheel for rotating the same; reaction means interconnecting said power source and said implement frame for preventing rotation of said motor about said wheel axis; draft means joining said wheel and implement frame for pulling said frame forwardly in response to forward rolling motion of said wheel; stabilizing means connected to said wheel and having a pivotal connection, about a fore-and-aft axis on said implement frame; and resilient means between said implement frame and said stabilizing means for yieldably restraining pivotal movement of said wheel about said fore-and-aft axis. 2. A garden tractor as defined in claim 1 wherein said stabilizing means includes a member rigid therewith and extending laterally of said fore-and-aft axis, said resilient means comprising compression springs bearing on opposite sides of said member and reacting against said implement frame, and means for adjusting the compression of said springs. 3. A garden tractor as defined in claim 1 wherein said reaction means includes an inverted U-shaped yoke member straddling the top of said wheel and being rigidly fixed to said power source by journal means at the axis of said wheel, and a beam extending from the upper portion of said yoke to said implement frame, said beam being pivotally connected to said yoke about at least a vertical axis whereby said wheel and yoke may be steered about said vertical axis, relative to said frame. 4. A garden tractor as defined in claim 3 wherein said beam is connected to said implement frame for pivotal movement about a fore-and-aft axis and for limited sliding movement in a fore-and-aft direction. 5. A garden tractor as defined in claim 4 wherein said beam is connected to said yoke by a ball and socket joint. 6. A garden tractor as defined in claim 5 including a heavy weight mass fixed to said power source and positioned adjacent the bottom of said wheel, substantially below the axis thereof. 7. A garden tractor as defined in claim 3 wherein said stabilizing means includes laterally spaced guides extending forwardly from adjacent said implement frame, on opposite sides of said wheel, and links telescopically slidable along said guides and connected at their forward ends to said yoke member adjacent the axis of said wheel. 8. A garden tractor as defined in claim 7 wherein said guides converge forwardly toward said wheel and wherein said links are connected to said yoke by universal pivot means. 9. A garden tractor as defined in claim 3 wherein said draft means includes steering means comprising; a transversely extending lever pivoted, intermediate its ends, to said stabilizing means rearwardly of said wheel; tension members extending from the ends of said lever, on respectively opposite sides of said wheel and connected to said yoke member adjacent said wheel axis; and manually operable means on said implement frame for selectively swinging said lever in either direction about its pivot. 10. A garden tractor as defined in claim 9 wherein said manually operable means comprises a pulley journalled on said implement frame and handle means for rotating said pulley; cable means trained around said pulley with its ends extending forwardly from opposite sides thereof; and means connecting said cable ends to respectively opposite end portions of said transverse lever. 11. A garden tractor comprising: an implement frame; a traction wheel forwardly of said implement frame and having a power source suspended therein about the axis of said wheel and drivingly connected to said wheel for rotating the same; an inverted U-shaped yoke straddling the top of said wheel and having a reaction member pivoted to the top thereof and connected to said implement frame; means interconnecting said power source and said implement frame for preventing rotation of said power source about said wheel axis; articulated draft means extending from said yoke to said implement frame; said power source comprising a sub frame having thereon an internal combustion engine having throttle control means, a reversible power transmission for transmitting power from said engine to said wheel, and transmission control means; hollow tubular trunnions fixed to said sub-frame, on opposite sides thereof, said traction wheel being journalled on said trunnions and said yoke being rigidly secured to the outer ends of said trunnions; and manually operable actuating members on said implement frame and articulated means connected to said actuating members and extending from said actuating members to the top of said yoke then downwardly along the legs of said yoke and through said hollow trunnions and being connected, respectively, to said throttle control means and said transmission control means. 12. A garden tractor ad defined in claim 11 wherein an output shaft on said engine has a pair of drive pulleys fixed thereon and said transmission includes a pair of driven pulleys fixed on a single shaft; a pair of belts trained about respectively opposed drive and driven pulleys but sifficiently loosely to be normally incapable of driving said driven pulleys, one of said belts being crossed between said pulleys; said transmission control means comprising movable idler pulleys adapted to selectively engage and tighten said belts, said idler pulleys being movable in one direction to tighten one belf for drive in one direction and in the other direction to tighten the other belt for reverse drive, an intermediate position of said pulleys leaving both belts loose. 13. A garden tractor as defined in claim 11 including a fuel tank mounted atop said yoke and a fuel line extending downwardly from said tank and through one of said trunnions to said engine. |
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