A jack stand apparatus enables operators to screw adjust a load support column relative to a column support base for fully completing load-bearing distances between loads and opposed support surfacing, and thus improving safety of jack stand applications. The various embodiments of the jack stand apparatus according to the present invention may all be said to comprise a shaft support structure, a shaft construction, a pawl assembly, and a screw mechanism. In the preferred embodiment, the shaft construction is a screw type element and includes external threads. A pawl element is cooperable with the external threads, and the screw shaft construction is telescopically positionable relative to the shaft support structure for engaging an overlying load. The pawl element is engagable with the helical threads for preventing downward movement of the screw shaft construction relative to the shaft support structure for supporting loads thereupon.

A pipe jack or jack mechanism. The jack mechanism can include a base structure that can include a substantially vertical support member and a plurality of legs angularly disposed therefrom. An elevation member can be configured to move within the substantially vertical support member. A safety ring that can be generally circular can be disposed about an outer perimeter of the elevation member and can extend outwardly therefrom. An annular lock can be adjustably disposed about the outer perimeter of the elevation member and can be positioned below the safety ring. A stop gap can be positioned between the safety ring and the annular lock. A block cap can be disposed on a bottom portion of the substantially vertical support member to prevent the elevation member from extending beyond an end of the substantially vertical support member.

The present invention relates an elevating apparatus based on a hetero-oriented non-isometric, dual-spiral drive structure, comprising a first carrier and a second carrier, further comprising a first support and a second support that are telescoped together in a manner that they can rotate with respect to each other, the first support is provided with a first recessed portion and a first raised portion that shares the same spiral direction and spiral pitch, the second support is provided with a homo-oriented, isometric, dual-spiral second recessed portion that has a spiral direction different from that of the first recessed portion. The carrier of the present invention is provided in a simply-supported-beam, and the carrier force can be achieved without additional weight, and the operation is stable and reliable.

The present invention relates an elevating apparatus based on a hetero-oriented non-isometric, dual-spiral drive structure, comprising a first carrier and a second carrier, further comprising a first support and a second support that are telescoped together in a manner that they can rotate with respect to each other, the first support is provided with a first recessed portion and a first raised portion that shares the same spiral direction and spiral pitch, the second support is provided with a homo-oriented, isometric, dual-spiral second recessed portion that has a spiral direction different from that of the first recessed portion. The carrier of the present invention is provided in a simply-supported-beam, and the carrier force can be achieved without additional weight, and the operation is stable and reliable.

An up-and-down driving device allows an up-and-down driving unit to move while supporting an object's load, in a support module in which the up-and-down driving unit is movably inserted into an inner space of a fixed housing. The up-and-down driving device includes: a driving means for moving the up-and-down driving unit in an up-and-down direction; a fixed-position compression spring main module including a fixed-position compression spring having one side fixed to a lower end of the housing and the other side supporting the up-and-down driving unit and mounted in a motion direction of the up-and-down driving unit; and a variable-position compression spring supplemental module including a variable-position compression spring having one side mounted rotatably to a side of the housing and the other side fastened rotatably to the up-and-down driving unit and configured to rotate while making a predetermined angle with the motion direction of the up-and-down driving unit.

An up-and-down driving device allows an up-and-down driving unit to move while supporting an object's load, in a support module in which the up-and-down driving unit is movably inserted into an inner space of a fixed housing. The up-and-down driving device includes: a driving means for moving the up-and-down driving unit in an up-and-down direction; a fixed-position compression spring main module including a fixed-position compression spring having one side fixed to a lower end of the housing and the other side supporting the up-and-down driving unit and mounted in a motion direction of the up-and-down driving unit; and a variable-position compression spring supplemental module including a variable-position compression spring having one side mounted rotatably to a side of the housing and the other side fastened rotatably to the up-and-down driving unit and configured to rotate while making a predetermined angle with the motion direction of the up-and-down driving unit.

A pallet and method for supporting a spool for transport or use includes an elongated frame having two opposite ends and two opposite sides which extend between the two opposite ends. The frame includes a support surface within which a spool can be cradled so that the spool rests across the support surface and the barrel of the item is oriented substantially horizontally and normal to the longitudinal axis of the frame. A pair of cooperating members are arranged adjacent the sides of the frame and are cooperable with the spool barrel for placing a spool in condition to be lifted from the support surface. Jack assemblies are interposed between the cooperating members and the frame for lifting the spool from the support surface by way of the jack assemblies.

A pallet and method for supporting a spool for transport or use includes an elongated frame having two opposite ends and two opposite sides which extend between the two opposite ends. The frame includes a support surface within which a spool can be cradled so that the spool rests across the support surface and the barrel of the item is oriented substantially horizontally and normal to the longitudinal axis of the frame. A pair of cooperating members are arranged adjacent the sides of the frame and are cooperable with the spool barrel for placing a spool in condition to be lifted from the support surface. Jack assemblies are interposed between the cooperating members and the frame for lifting the spool from the support surface by way of the jack assemblies.

A transmission assembly includes a hollow spindle, an outer wall of which is provided with an outer thread; a transmission worm disposed in the hollow spindle; a first transmission nut which is thread-fitted with the transmission worm, wherein the hollow spindle is rotatably positioned relative to the first transmission nut in an axial direction, and an external portion of the first transmission nut is provided with a locking structure for limiting the first transmission nut from rotating; a second transmission nut which is thread-fitted with the hollow spindle; a bushing which is bushed outside of the hollow spindle, the second transmission nut being fixedly connected with the bushing; and a guide tube which is rotatably limited in the bushing.

A transmission assembly includes a hollow spindle, an outer wall of which is provided with an outer thread; a transmission worm disposed in the hollow spindle; a first transmission nut which is thread-fitted with the transmission worm, wherein the hollow spindle is rotatably positioned relative to the first transmission nut in an axial direction, and an external portion of the first transmission nut is provided with a locking structure for limiting the first transmission nut from rotating; a second transmission nut which is thread-fitted with the hollow spindle; a bushing which is bushed outside of the hollow spindle, the second transmission nut being fixedly connected with the bushing; and a guide tube which is rotatably limited in the bushing.