Self-locking jack
AssigneeEnerpac Heavy Lifting Technology B.V.
InventorsFrank Schiphorst, Bas Geerdink, Jeremy Stubbs
Life of this patent
Estimating the term…
Abstract
A jack includes a main body (14) with a cavity (18). A lifting cylinder (42) is supported on the main body and is extendable into the cavity. A lock (30, 34) is movably coupled to the main body. A spring (38) is coupled to the lock and biases the lock into the cavity. A cylinder (86) is coupled to the lock and biases the lock out of the cavity against the biasing force of the spring.
Claims20
A jack comprising:
- 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 a biasing force of the spring;
- 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 lifting actuator toward the second side, lifting movement of the cribbing member causing the lock to move at least partially out of the cavity.
A jack comprising:
- 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 a biasing force of the spring, 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.
A jack comprising:
- 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, 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 member causing the first lock and the second lock to move at least partially out of the cavity.
A jack comprising:
- 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, 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 main actuator.
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.
Dependencies are inferred from the claim text.