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1. WO2016154446 - JACK SYSTEM

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[ EN ]

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. A jack apparatus for heavy duty lifting comprising:

a base;

a pair of screw jacks on the base;

a yoke supported for lifting by the screw jacks;

a lifting tube supported on the yoke;

a shaft coupler for simultaneously operating the screw jacks; and

a power unit driving the shaft coupler.

2. The jack apparatus of claim 1, including a housing covering at least the yoke and the shaft coupler and a lower portion of the screw jacks.

3. The jack apparatus of any one of claims 1-2, wherein the lifting tube is removable, and including a plurality of tubes of different lengths that can replace the lifting tube.

4. The jack apparatus of any one of claims 1-3, including a base and a housing covering the jacks and yoke, and wherein the housing defines a top that extends laterally less than 3.5 inches from a center of the lifting tube.

5. The jack apparatus of any one of claims 1-4, including a base and angled braces supporting a vertical orientation of the lifting tube.

6. A jack system comprising: a plurality of the jack apparatus defined in any one of claims 1-5 and including a control operably connected to each of the plurality of jack apparatus for controlling simultaneous operation of the plurality of jack apparatus.

7. A jack apparatus for heavy duty lifting comprising:

a pair of screw jacks;

a yoke having ends supported by the screw jacks and a lower center section;

a lifting tube supported on the center section of the yoke; and

a power unit for simultaneously driving the screw jacks to lift the yoke and lifting tube.

8. The jack apparatus defined in claim 7, wherein each of the screw jacks includes a rotatable driving member for rotating a threaded lifting shaft of each screw jack, the shaft coupler connecting the rotatable driving members of each of the screw jacks.

9. A jack system comprising: a plurality of the jack apparatus defined in any one of claims 7-8 and including a control operably connected to each of the plurality of jack apparatus for controlling simultaneous operation of the plurality of jack apparatus.

10. A jack apparatus for heavy duty lifting comprising:

a base including a base plate, a cylindrical tube section, and angled braces supporting the tube section on the base plate;

at least one screw jack on the base;

a yoke supported for lifting by the at least one screw jack; and

a plurality of lifting tubes having different lengths and adapted to be supported on the yoke with an upper end extending upwardly slidably through the tube section, each of the lifting tubes being releasably supported on the yoke for replacement so that the jack apparatus has different lowest and highest lift points.

11. A jacking system comprising:

at least two jack apparatus for simultaneous operation for heavy duty lifting; each jack apparatus including a pair of screw jacks with a threaded lifting shaft and a rotatable driving member for vertically extending the threaded lifting shaft, a yoke having ends supported by the lifting shafts of the screw jacks and a lower center section, a lifting tube supported on the center section of the yoke, and a power unit for simultaneously driving the screw jacks to lift the yoke and lifting tube; and

a control unit operably connected to each of the power units of each jack apparatus to simultaneously operate each of the jack assemblies an equivalent amount.

12. The jack apparatus of claim 11, wherein the power unit includes an electric motor operably connected to driving nuts on the screw jacks, and wherein the driving nuts and electric motor prevent accidental lowering of the screw jacks if electrical power is lost.

13. A jack system for heavy duty lifting comprising:

a plurality of jacks, each including

a base with at least one screw jack on the base;

a lifting tube supported by the at least one screw jack;

a shaft coupler for operating the at least one screw jack; and an electric drive unit coupled to and configured to drive the shaft coupler; and

a control system operably connected to the electric drive unit of each jack for operating each of the jacks individually or simultaneously, the control system including circuit breakers associated with each of the jacks, the control system being configured to shut down selected ones of jacks if the circuit breaker of a particular one of the jacks indicates a problem.

14. The jack system of claim 13, wherein the at least one screw jack includes a pair of screw jacks and a yoke extending between the screw jacks, and wherein the lifting tube is supported on the yoke.

15. A method for heavy duty lifting comprising:

providing a plurality of jacks, each including

a base with at least one screw jack on the base;

a lifting tube supported by the at least one screw jack;

a shaft coupler for operating the at least one screw jack; and an electric drive unit coupled to and configured to drive the shaft coupler; and

providing a control system operably connected to the electric drive unit of each jack for operating each of the jacks individually or simultaneously, the control system including circuit breakers associated with each of the jacks; and

shutting down all of the jacks if the circuit breaker of one of the jacks indicates a problem.