IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0738064
(2007-04-20)
|
등록번호 |
US-7730705
(2010-06-29)
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발명자
/ 주소 |
|
출원인 / 주소 |
- Parker-Hannifin Corporation
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대리인 / 주소 |
Renner, Otto, Boisselle & Sklar, LLP
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인용정보 |
피인용 횟수 :
6 인용 특허 :
14 |
초록
▼
A mower deck lift mechanism for a lawn mower includes a mower deck, a linkage mechanism for movably mounting the mower deck to the frame for raising and lowering movement relative to the frame, and an electro-hydraulic actuator assembly connected to the linkage mechanism for raising and lowering the
A mower deck lift mechanism for a lawn mower includes a mower deck, a linkage mechanism for movably mounting the mower deck to the frame for raising and lowering movement relative to the frame, and an electro-hydraulic actuator assembly connected to the linkage mechanism for raising and lowering the mower deck relative to the frame. The actuator assembly is an integrated unit including a hydraulic piston-cylinder assembly connected to the linkage mechanism, a pump for supplying pressurized fluid to the piston-cylinder assembly, and an electric motor for driving the pump.
대표청구항
▼
What is claimed is: 1. A mower deck lift mechanism for a lawn mower having a frame, the mower deck lift mechanism comprising: a mower deck; a linkage mechanism for movably mounting the mower deck to the frame for raising and lowering movement relative to the frame; and an electro-hydraulic actuator
What is claimed is: 1. A mower deck lift mechanism for a lawn mower having a frame, the mower deck lift mechanism comprising: a mower deck; a linkage mechanism for movably mounting the mower deck to the frame for raising and lowering movement relative to the frame; and an electro-hydraulic actuator assembly connected to the linkage mechanism for raising and lowering the mower deck relative to the frame, the actuator assembly including a hydraulic piston-cylinder assembly connected to the linkage mechanism, a pump for supplying pressurized fluid to the piston-cylinder assembly, and an electric motor for driving the pump; and wherein the actuator assembly includes valving that supplies pressurized fluid from the pump to the piston-cylinder assembly when the motor is energized, and returns fluid from the piston-cylinder assembly to a reservoir when the motor is not energized, whereby movement of the piston-cylinder assembly is not inhibited when the motor is not energized, wherein the valving includes a pilot operated check valve assembly including an inlet connected to the outlet of the pump, an outlet connected to a working chamber in the piston-cylinder assembly, a return connected to a reservoir, a pilot valve movable from a first position by fluid pressure at the inlet to a second position connecting the inlet to the outlet for flow of pressurized fluid to the working chamber of the piston-cylinder assembly, and the pilot valve in the first position connecting the working chamber of the piston-cylinder assembly to the return for allowing flow of fluid from the working chamber to the reservoir. 2. A mower deck lift mechanism as set forth in claim 1, wherein the piston-cylinder assembly, pump and motor are an integral unit having a pivot connection for pivotal mounting to the frame of the lawn mower. 3. A mower deck lift mechanism as set forth in claim 2, wherein the pivot connection includes a pair of transversely opposed trunnions. 4. A mower deck lift mechanism as set forth in claim 1, further comprising an adjustable stop for limiting the extent the mower deck can be lowered to an adjustment position while allowing the mower deck to move upwardly from the adjustment position, and wherein the actuator assembly is operable to raise the mower deck to a level that permits adjustment of the adjustable stop under a no load condition. 5. A mower deck lift mechanism as set forth in claim 1, wherein the piston-cylinder assembly includes a piston rod connected to a crank, and the crank is in turn connected to the linkage mechanism such that rotation of the crank effects raising or lowering of the mower deck. 6. A mower deck lift mechanism as set forth in claim 1 wherein the linkage mechanism includes a pair of shafts, each shaft having for rotational movement therewith a lift arm and a connecting arm, the lift arms having distal ends connected to respective hangers from which the mower deck is suspended, and the connecting arms having distal ends connected to a common connector link whereby rotation of one shaft will effect rotation of the other shaft. 7. A mower deck lift mechanism as set forth in claim 6, wherein the piston-cylinder assembly includes a piston rod connected to a crank connected to one of the shafts for raising or lowering of the mower deck. 8. A mower deck lift mechanism as set forth in claim 1, wherein the return has therein an orifice for restricting the rate of flow of fluid to the reservoir for lowering of the mower deck at a controlled rate. 9. A mower deck lift mechanism as set forth in claim 1, in combination with the lawn mower. 10. A combination as set forth in claim 9, wherein the mower deck lift mechanism is mounted to the frame of the lawn mower. 11. A combination as set forth in claim 9, wherein the lawn mower includes a battery, and the electrical motor is connected to the battery by a manually operable switch for connecting and disconnecting the motor to the battery. 12. A combination as set forth in claim 9, further comprising a counterbalancing spring connected between the linkage mechanism and the frame for at least partially counterbalancing the weight of the mower deck. 13. A mower deck lift mechanism for a lawn mower having a frame and a mower deck, the lift mechanism comprising: a linkage mechanism for movably mounting the mower deck to the frame for raising and lowering movement relative to the frame; an actuator assembly connected to the linkage mechanism for raising and lowering the mower deck relative to the frame, the actuator assembly including a hydraulic piston-cylinder assembly connected to the linkage mechanism, a pump for supplying pressurized fluid to the piston-cylinder assembly, and an electric motor for driving the pump; and wherein the actuator assembly includes valving that supplies pressurized fluid from the pump to the piston-cylinder assembly when the motor is energized, and returns fluid from the piston-cylinder assembly to a reservoir when the motor is not energized, whereby movement of the piston-cylinder assembly is not inhibited when the motor is not energized, wherein the valving includes a pilot operated check valve assembly including an inlet connected to the outlet of the pump, an outlet connected to a working chamber in the piston-cylinder assembly, a return connected to a reservoir, a pilot valve movable from a first position by fluid pressure at the inlet to a second position connecting the inlet to the outlet for flow of pressurized fluid to the working chamber of the piston-cylinder assembly, and the pilot valve in the first position connecting the working chamber of the piston-cylinder assembly to the return for allowing flow of fluid from the working chamber to the reservoir. 14. A mower deck lift mechanism as set forth in claim 13, wherein the return has therein an orifice for restricting the rate of flow of fluid to the reservoir for lowering of the mower deck at a controlled rate.
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