IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0656504
(2010-02-01)
|
등록번호 |
US-8267222
(2012-09-18)
|
발명자
/ 주소 |
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
12 |
초록
▼
The compact scissors lift includes a chassis having a body, a pair of wheels disposed at one end and a pair of steering wheels at the opposite end; a lifting linkset assembly disposed substantially within the base, the linkset assembly shaped to form space for the steering wheels; a steering system
The compact scissors lift includes a chassis having a body, a pair of wheels disposed at one end and a pair of steering wheels at the opposite end; a lifting linkset assembly disposed substantially within the base, the linkset assembly shaped to form space for the steering wheels; a steering system operatively connected to the steering wheels in front of the linkset assembly; and a deployable safety guard mechanism, on at least one side of the chassis. Having the linkset assembly within the chassis body reduces the overall stow height of the lift to thereby increase access to work areas, decrease physical expenditure on the user, increase stable steering and increase safe operation on potentially hazardous terrain.
대표청구항
▼
1. A compact scissors lift, comprising: a chassis having an elongated body;a pair of follower wheels disposed at one end of the body and a pair of steering wheels disposed at the opposite end of the body, the wheels defining a wheelbase;a lifting linkset assembly disposed substantially within the bo
1. A compact scissors lift, comprising: a chassis having an elongated body;a pair of follower wheels disposed at one end of the body and a pair of steering wheels disposed at the opposite end of the body, the wheels defining a wheelbase;a lifting linkset assembly disposed substantially within the body, the linkset assembly having space for the steering wheels, wherein the linkset assembly has a stepped rectangular shape including a plurality of stacked linksets, each of the linksets includes: (i) a wide width section, a stepped portion, and a small width section, the difference between the widths of the sections providing space for the steering wheel wheels;(ii) an outer lift support frame including a wide width section defining spaced parallel outer support arms and a stepped portion to spaced parallel inner support arms at the small width section;(iii) an inner lifting frame including a wide width section defining spaced parallel outer lifting arms and a stepped portion to spaced parallel inner lifting arms at the small width section, wherein the inner lifting frame is complementary nested inside the outer lift support frame, both frames being of substantially equal length and pivotable with respect to each other about a common pivot located proximate to the stepped portions; and(iv) pivot extensions at opposite ends of both outer support frame and inner lifting frame, the pivot extensions permitting stacked pivoting between linksets or lifting of the platform;a platform operatively disposed on top of the linkset assembly;a hydraulic actuator pivotally disposed within the linkset assembly, the actuator selectively raising and lowering the platform;a steering system operatively connected to the steering wheels in front of the linkset assembly; anda deployable safety guard mechanism attached to at least one side of the chassis body. 2. The compact scissor lift according to claim 1, further comprising a pivotable locking collar on one of the linksets, wherein the hydraulic actuator comprises a hydraulic cylinder detachably mounted to the pivotable locking collar on one of the linksets. 3. The compact scissor lift according to claim 2, wherein the hydraulic cylinder comprises a cylinder body and a piston rod reciprocating within the cylinder body, the cylinder body being detachably mounted to the pivotable locking collar and the piston rod pivotably mounted to one of the other linksets. 4. The compact scissor lift according to claim 2, wherein the hydraulic cylinder comprises a cylinder body and a piston rod reciprocating within the cylinder body, the piston rod being detachably mounted to the pivotable locking collar and the cylinder body pivotably mounted to one of the other linksets. 5. The compact scissor lift according to claim 1, wherein the hydraulic actuator comprises a hydraulic cylinder detachably mounted to a pivotable locking collar on the chassis. 6. The compact scissor lift according to claim 1, wherein the steering system comprises: a steering chassis frame disposed in front of the linkset assembly;a double acting, hydraulic steering cylinder rigidly attached to the steering chassis frame in front of the linkset assembly, the steering cylinder having a steering rod reciprocating therein;a slidable extension connector at each end of the steering rod, the extension connector being adapted to transfer steering input while maintaining steering geometry within a given length of the chassis,a steering tie link operatively connected to a respective extension connector and a steering arm of a respective steering wheel, anda rail system to counterbalance bending forces on the extension connectors during operation;wherein reciprocation of the steering rod concurrently reciprocates the extension connectors causing the tie links to translate and leverage the steering arms and thereby rotate the steering wheels about respective virtual steering axes. 7. The compact scissor lift according to claim 6, wherein the rail system comprises: a pair of elongate slots in the steering chassis frame;a rectangular rail disposed on the steering chassis frame behind each slot and covering the the frame, each slot and corresponding rail forming a T-shaped channel; and a T-shaped slider disposed on each extension connector, the T-shaped slider being adapted to ride within the T-shaped channel;wherein the confined linear movement of the extension connector within the rail system counterbalances the bending forces experienced during operation. 8. The compact scissor lift according to claim 6, wherein the rail system comprises a pair of L-shape rail bars spaced between the steering chassis frame and the steering arms, each rail bar having a stepped ledge upon which a respective extension connector rides, the spacing forming a channel confining the movement of the extension connector to be linear which counterbalances the bending forces experienced during operation. 9. The compact scissor lift according to claim 1, wherein the safety guard mechanism comprises: a female helical screw mounted to a safety guard drive rod, the helical screw having a helical slot formed thereon; anda safety guard fixedly attached to the safety guard drive rod;wherein selective rotation of the helical screw rotates the safety guard between stowed and deployed positions to stabilize the compact scissor lift during operation on an uneven terrain. 10. The compact scissor lift according to claim 9, further comprising a drive mechanism for selective deployment of the safety guard. 11. The compact scissor lift according to claim 10, wherein the drive mechanism comprises: an elongate guard drive bar disposed across a substantial width of the linkset assembly, each end of the drive bar having a follower adapted to ride in the helical slot of a respective helical screw to thereby cause the helical screw to selectively rotate as the follower travels along the helical slot; anda rack and pinion system for driving the guard drive bar. 12. The compact scissor lift according to claim 11, wherein the rack and pinion system comprises: a pair of spaced, elongate driven bars with one end fixedly attached to the guard drive bar, the other end of each driven bar having a lower rack;a reciprocating driver disposed above a respective driven bar, the driver having an upper rack; anda fixed pinion gear meshed between the upper and lower racks;wherein reciprocation of the driver in one direction causes the respective driven bar to reciprocate in the opposite direction. 13. The compact scissor lift according to claim 12, wherein the driver comprises: an L-shaped slider having an upright portion and a horizontal portion;a bore on the upright portion adapted to be pivotably mounted to a linkset of the linkset assembly; andthe upper rack formed on the bottom of the horizontal portion;wherein unfolding and folding of the linkset assembly causes the slider to reciprocate. 14. The compact scissor lift according to claim 13, further comprising a shaped, channel rail for the slider to confine the movement thereof.
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