Automatic adjustable spreader bar
A device for lifting oversized pieces of material. The device includes a spreader bar capable of attaching to a lifting vehicle. At least two cross members are attached to the spreader bar along with at least one cross-member power source. The at least one cross-member power source is connected to at least one drive mechanism which in turn is connected to at least one of the at least two cross members. A load-pick power source is attached to each of the at least two cross members and well as to at least one load-pick drive mechanism. The at least one load-pick drive mechanism is connected to each of the at least two load pick points, and the cross-member and the load-pick power sources are each electrically connected to an operating or control panel in a cab of the lifting vehicle.
1. A device for lifting oversized pieces of material, the device comprised of:
a spreader bar capable of attaching to a hoisting system of a lifting vehicle;
at least two cross members attached to the spreader bar;
at least one cross-member power source attached to the spreader bar, the at least one cross-member power source connected to at least one drive mechanism;
the at least one drive mechanism connected to at least one of the at least two cross members;
a load-pick power source attached to each of the at least two cross members, the load-pick power source connected to at least one load-pick drive mechanism, the at least one load-pick drive mechanism connected to at least two load pick latching mechanisms which power two load pick points wherein the at least two load pick latching mechanisms are positioned by the load-pick drive mechanism along a length of the cross member so as to vary a distance between the load pick points, thereby allowing the load pick points to engage with a lifting connection on an object to be lifted; and
the cross-member power source and the load-pick power source each electrically connected to an operating panel in a cab of the lifting vehicle.
2. The device of claim 1 , wherein the cross-member power source and the load-pick power source are electric motors.
3. The device of claim 1 , wherein the cross-member power source and the load-pick power source are hydraulic motors.
4. The device of claim 1 , wherein the at least one drive mechanism connected to at least one of the at least two cross members is a chain.
5. The device of claim 1 , wherein the at least one load-pick drive mechanism is a hydraulic cylinder.
6. The device of claim 1 , wherein the cross-member power source and load-pick power source are each electrically connected to an operating panel remote from the lifting device.
7. The device of claim 1 , wherein:
the cross-member power source is connected to a first and a second drive mechanism;
each of the first and second drive mechanisms are connected to a first and a second cross-member, respectively;
a first and a second load-pick power source connected to each of the first and second cross-member, respectively;
the first and second load-pick power sources connected to a first and a second load-pick drive mechanism, respectively; and
the first and second load-pick drive mechanisms connected to a first and second load pick point, respectively.
8. The device of claim 1 , wherein:
each one of the at least two load pick points is connected to a hydraulic actuator;
each of the hydraulic actuators is connected to the at least one load-pick drive mechanism.
9. The device of claim 1 , wherein the drive mechanism is an electric actuator.
10. The device of claim 9 , wherein the electric actuator is an electric linear actuator.
11. The device of claim 1 , wherein each of the at least two load ipick points includes a load-engaging member.
12. The device of claim 11 , wherein the load-engaging member a self-locking hook device.
13. The device of claim 11 , wherein the load-engaging member is a twist-lock type device.