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1. WO2020198620 - VÉRIN AUTOBLOQUANT

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

CLAIMS

What is claimed is:

1. A j ack compri sing :

a main body including a cavity;

a lifting actuator supported on the main body and extendable into the cavity;

a lock movably coupled to the main body;

a spring coupled to the lock and biasing the lock into the cavity; and

a lock actuator coupled to the lock and selectively biasing the lock out of the cavity against the biasing force of the spring.

2. The jack of claim 1, wherein the lock is a first lock, the spring is a first spring, and the lock actuator is a first lock actuator, the jack further comprising

a second lock movably coupled to the main body opposite the first lock;

a second spring coupled to the second lock and configured to bias the second lock into the cavity; and

a second lock actuator coupled to the second lock and configured to bias the second lock out of the cavity when supplied with fluid.

3. The jack of claim 1, wherein the main body further comprises a lever moveable between a first position and a second position, wherein fluid is prevented from reaching the lock actuator while the lever is in the first position, and fluid reaches the lock actuator and exerts a fluid force on the lock greater than a spring force exerted by the spring.

4. The jack of claim 1, wherein the lock includes a wheel rotatable relative to the main body and configured to engage a surface of a cribbing member that is supported by the lifting actuator.

5. The jack of claim 1, wherein the cavity is open on a first side and a second side of the main body.

6. The jack of claim 1, further comprising a tray coupled to the main body, the tray having a width substantially equivalent to a width of the cavity.

7. A j ack compri sing :

a main body including a cavity;

a first lock movably coupled to the main body and biased into the cavity;

a second lock movably coupled to the main body and positioned opposite the first lock, the second lock biased into the cavity; and

a main actuator coupled to the main body and movable through the cavity.

8. The jack of claim 7, wherein the main actuator is movable in a direction generally orthogonal with respect to a plane in which at least one of the first lock and the second lock is positioned.

9. The jack of claim 7, wherein a width of the main actuator is less than a distance between the first lock and the second lock are biased into the cavity.

10. The jack of claim 7, further comprising a first spring coupled to the first lock and a second spring coupled to the second lock, the first and second springs applying a spring force to bias the respective first and second locks.

11. The jack of claim 10, further comprising a first cylinder coupled to the first lock and a second cylinder coupled to the second lock, the first cylinder and second cylinder configured to receive a fluid and apply a fluid force directed opposite the spring force to move the first and second locks at least partially out of the cavity.

12. The jack of claim 7, wherein the first lock includes a wheel rotatable relative to the main body and configured to engage a surface of a cribbing member that is supported by the lifting actuator.

13. The jack of claim 7, wherein the cavity is open on a first side and a second side, the cavity configured to receive a cribbing member through the first side to be lifted by the main actuator toward the second side, lifting movement of the cribbing block causing the first lock and second lock to move at least partially out of the cavity.

14. The jack of claim 7, further comprising a tray coupled to the main housing, the tray having a width substantially equivalent to a width of the cavity.

15. A method of supporting a load with a jack, the jack including a main body with a cavity and locks biased into the cavity, the method comprising:

positioning a cribbing block proximate the cavity;

extending a main actuator to engage the cribbing block and lift the cribbing block relative to the cavity;

moving the locks at least partially out of the cavity to allow the cribbing block to pass between the locks;

after the cribbing block passes at least partially between the locks, returning the locks to their initial position; and

supporting the cribbing block on an upper surface of the locks.

16. The method of claim 15, wherein positioning a cribbing block proximate the cavity further includes initially positioning the cribbing block within the cavity.

17. The method of claim 15, further comprising contacting the locks with a tapered outer edge of the cribbing block.

18. The method of claim 15, further comprising supplying a hydraulic fluid to lock actuators coupled to the locks, the lock actuator providing a fluid force to the locks to move the locks at least partially out of the cavity.

19. The method of claim 15, further comprising moving a valve from a first position to a second position in order to provide fluid communication with lock actuators.

20. The method of claim 15, wherein extending the main actuator to engage the cribbing block and lift the cribbing block relative to the cavity further includes lifting the cribbing block off the upper surface of the locks, and wherein the method further includes retracting the main actuator and lowering the cribbing block into the cavity.

21. The method of claim 15, wherein returning the locks to their initial position further includes automatically returning the locks to their initial position.

22. A j ack compri sing :

a main body including an end surface and an opening extending through the end surface along a jack axis;

a jack actuator supported on the main body, the jack actuator extendable and retractable along the jack axis, the jack actuator exerting a lifting force to be transmitted to a supported load; a lock supported for movement on the main body, the lock biased toward a first position in which the lock protrudes at least partially into the opening; and

a lock actuator coupled to the lock and operable to selectively move the lock toward a second position in which the lock does not protrude into the opening.

23. The j ack of claim 22, wherein the j ack actuator is configured to engage a cribbing member for transmitting the lifting force to the supported load, the jack actuator being extendable to lift the cribbing member above the end surface of the main body.

24. The jack of claim 23, wherein the lock is configured to support the cribbing member once the cribbing member has passed at least partially above the end surface.

25. The jack of claim 22, wherein the lock is a first lock, the jack including a second lock positioned adjacent an opposite side of the opening from the first lock relative to the jack axis, the first lock and the second lock oriented in a plane that is orthogonal to the jack axis.

26. The jack of claim 25, wherein the first lock and the second lock are biased inwardly toward one another.

27. The jack of claim 22, wherein the lock is biased toward an extended position in which the lock protrudes inwardly toward the jack axis, wherein operation of the lock actuator retracts the lock.

28. The jack of claim 22, wherein the main body includes a side surface having a side opening configured to receive a cribbing block to facilitate positioning the cribbing block between the lock and the jack actuator.

29. The jack of claim 22, further comprising a valve movable between a first position and a second position, the valve preventing fluid communication between a fluid source and the lock

actuator while in the first position, the valve permitting fluid communication between the fluid source and the lock actuator while in the second position.

30. The jack of claim 29, wherein the valve is a first valve, further comprising a second valve positioned in series with the first valve, the second valve movable between a first position and a second position, the second valve preventing fluid communication between the first valve and the lock actuator while in the first position, the second valve permitting fluid communication between the first valve and the lock actuator while in the second position, the second valve movable to the second position when the jack actuator is within a predetermined distance of a full extension position.

31. The jack of claim 30, further comprising a third valve movable between a first position and a second position, the second valve permitting fluid communication between the lock actuator and a fluid reservoir while in the first position, the second valve preventing fluid communication between the lock actuator and the fluid reservoir while in the second position, the second valve movable to the second position when the jack actuator is within a

predetermined distance of a full extension position.

32. A method for operating a jack to lift a load, the method comprising:

positioning a cribbing member adjacent a main actuator;

extending the main actuator to lift the cribbing member at least partially beyond an end surface of a main body, the cribbing member transmitting a lifting force from the main actuator to the load;

supporting the cribbing member on a lock positioned adjacent the end surface; and retracting the main actuator away from the cribbing member.

33. The method of claim 32, wherein extending the main actuator to lift the cribbing member causes the lock to retract to permit the cribbing member to move past the lock.

34. The method of claim 32, wherein the cribbing member is a first cribbing member, the method further comprising,

after retracting the main actuator, positioning a second cribbing member between the main actuator and the first cribbing member; and

extending the main actuator to lift the second cribbing member beyond the end surface of the main body, the second cribbing member engaging the first cribbing member in a stacked relationship, the second cribbing member and the first cribbing member transmitting a lifting force from the main actuator to the load.

35. A method for operating a jack to lower a supported load, the method comprising:

moving a main actuator to support a cribbing member independent of a lock, the cribbing member transmitting a lifting force from the main actuator to the supported load;

retracting the lock;

moving the main actuator to lower the cribbing member;

extending the lock;

after the cribbing member has been lowered past the lock, removing the cribbing member from the main actuator.

36. The method of claim 35, wherein retracting the lock includes actuating a fluid actuator to move the lock against a biasing force.

37. The method of claim 36, wherein extending the lock includes preventing pressurized fluid from energizing the fluid actuator, thereby causing a biasing force to move the lock to an extended position.

38. The method of claim 35, wherein the cribbing member is a first cribbing member positioned below a second cribbing member in a stacked relationship, wherein after the first cribbing member has been lowered past the lock, the second cribbing member is supported on the lock, the method further comprising,

after removing the first cribbing member, extending the main actuator to support the second cribbing member independent of the lock;

retracting the lock;

retracting the main actuator to lower the second cribbing member;

extending the lock;

after the second cribbing member has been lowered past the lock, removing the second cribbing member from the main actuator.