DESC:FIELD OF INVENTION:
[0001] The present invention generally relates to a power screw jack with self-locking square thread. More particularly, the present invention relates to a self-locking power jack suitable to handle a heavy gearbox of about 70,000 Kgf. (70-ton) weight for lifting, shifting, and positioning on its foundation top plate.

BACKGROUND OF THE INVENTION:
[0002] Power Screw Jack with self-locking threads is known in a variety of forms. When comparing male and female threads of a fastener, the turns of the male threads are circular about the thread root and bent away from the head end in the axial direction in order to produce special friction.

[0003] A gearbox is provided with a jacking bolt of size M36x3, 450 mm long on all four corners, which is suitable to rest the gearbox on its foundation during positioning and aligning. Gearboxes are required to be lifted and lowered repeatedly by maintaining a controlled position of all six degrees of freedom of equipment, which is not possible with the presently available lifting bolt.

[0004] To overcome the aforesaid problem, a novel self-locking power screw jack is introduced herein.

SUMMARY OF INVENTION:
[0005] The primary object of the present invention is to provide a self-locking power screw jack that is capable of handling the substantial weight of a heavy gearbox, specifically up to 70 tons or 70,000 Kgf.
[0006] Another object of the present invention is to ensure stable positioning of the self-locking power screw jack assembly within the pre-drilled foundation hole.
[0007] Another object of the present invention is to enable simultaneous lifting and lowering of the heavy gearbox by employing all four power screw jacks together.
[0008] Another object of the invention is to extend the utility of the self-locking power screw jack to handle even heavier equipment while maintaining alignment iterations.
[0009] The present invention pertains to a power screw jack with self-locking square thread which is suitable to handle a heavy gearbox of 70-ton weight for lifting, shifting, and positioning on its foundation top plate.
[0010] In an aspect of the present invention, the self-locking power screw jack assembly comprises a power screw having a threaded rod with a screw head is positioned at one end of the threaded rod, wherein the power screw is configured to fit within a pre-drilled foundation hole, a plurality of load bearing attachment is positioned at a corner of a pre-drilled foundation hole,a top locking ring, and a bottom locking ring are affixed to the power screw to secure its position within the pre-drilled foundation hole, a bearing is assembled on top of the threaded rod through a cap packing.
[0011] In an aspect of the present invention, the threaded rod having a self-locking square thread configuration.
[0012] In an aspect of the present invention, the center screw holding nuts are used as a load bearing attachment.
[0013] In an aspect of the present invention, the method for utilizing a self-locking power screw assembly for lifting and lowering a gearbox, comprising of inserting each power screw into a pre-drilled foundation hole, securing the power screw in place using the load bearing attachment at the four corners of the pre-drilled foundation hole, affixing a top locking ring and a bottom locking ring to the power screw to prevent movement within the foundation hole, installing thrust bearing atop each threaded screw using cap packing, rotating plurality of power screws to achieve coordinated lifting and lowering of the gearbox while maintaining precise alignment.
[0014] In an aspect of the present invention, the pre-drilled foundation hole diameter having the diameter of 105 mm.

BRIEF DESCRIPTION OF THE DRAWINGS:
[0015] The invention has other advantages and features which will be more readily apparent from the following detailed description of the invention and the appended claims, when taken in conjunction with the accompanying drawings, in which:

Fig 1A: depicts the power screw of the present invention,
Fig 1B: depicts the power screw jack assembly attached to a gearbox,
Fig 1C: depicts the locking Ring on the Top and bottom of the Foundation Plate,
Fig 1D: depicts the Load Bearing Attachment.

DETAILED DESCRIPTION OF THE INVENTION:
[0016] While the invention has been disclosed with reference to certain embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt to a particular situation or material to the teachings of the invention without departing from its scope.

[0017] Throughout the specification and claims, the following terms take the meanings explicitly associated herein unless the context clearly dictates otherwise. The meaning of "a", "an", and "the" include plural references. The meaning of "in" includes "in" and "on." Referring to the drawings, like numbers indicate like parts throughout the views. Additionally, a reference to the singular includes a reference to the plural unless otherwise stated or inconsistent with the disclosure herein.

[0018] The figures and protocols have been represented where appropriate by conventional representations in the drawings, showing only those specific details that are pertinent to understanding the embodiments of the present invention so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having benefit of the description herein.

[0019] The present invention provides a self-locking power screw jack featuring a square thread configuration, designed specifically to manage the lifting, shifting, and precise positioning of substantial loads, such as a heavyweight gearbox of up to 70 tons.

[0020] As illustrated in Figure 1A to Fig.1D, the self-locking power screw jack assembly 100 consists of a power screw 101 having a threaded rod 10 with a screw head 20 positioned at one end of the threaded rod 10,the power screw 101 is configured to fit within a pre-drilled foundation hole, a plurality of load-bearing attachment 30 positioned at a corner of a pre-drilled foundation hole, a top locking ring 40 and a bottom locking ring 50 affixed to the power screw 101 to secure its position within the pre-drilled foundation hole, a bearing 60 assembled on top of the threaded rod 10 through a cap packing 70.

[0021] The method for utilizing a self-locking power screw assembly 100 for lifting and lowering a gearbox consists of inserting each power screw 101 into a pre-drilled foundation hole, securing the power screw 101 in place using the load bearing attachment 30 at the four corners of the pre-drilled foundation hole, affixing a top locking ring 40 and a bottom locking ring 50 to the power screw 101 to prevent movement within the foundation hole, installing thrust bearing 60 atop each threaded screw using cap packing 70, rotating plurality of power screws 101 to achieve coordinated lifting and lowering of the gearbox while maintaining precise alignment.

[0022] In an embodiment, the power screw 101 consists of a threaded rod 10 with a screw head 20 positioned at one end. The power screw 101 is specifically designed to fit within a pre-drilled foundation hole and forms the core of the lifting mechanism.

[0023] In an embodiment, the plurality of the load bearing attachment 30 is placed at the corners of the pre-drilled foundation hole. the load bearing attachment 30 provides stable points of contact for the assembly within the hole. They distribute the load and prevent tilting or misalignment during the lifting or lowering process.

[0024] In an embodiment, the top locking ring 40 and bottom locking ring 50 are affixed to the power screw 101 to ensure its secure position within the pre-drilled foundation hole. They prevent any movement or displacement of the power screw, enhancing stability and safety during lifting operations.
[0025] In an embodiment, the thrust bearing 60 is assembled on top of the threaded rod 10, this component enhances the smooth rotation of the threaded rod 10 and the cap packing 70 which is positioned atop the thrust bearing 60, further supports the function of the thrust bearing 60 and enhances load distribution. It provides a stable surface for the bearing to rest upon.

[0026] In an embodiment, the power screw 101 is made using EN 24 (40Ni2Cr l Mo 28).

[0027] In another embodiment of the present invention, the self-locking power screw jack assembly 100 is used to handle a heavy gearbox of 70-ton weight for lifting, shifting, and positioning on its foundation plate.

[0028] In yet another embodiment of the present invention, the power screw 101 can be used to fit into a pre-drilled foundation hole of the gearbox with a diameter of 105 mm.

[0029] In still another embodiment of the present invention, the self-locking power screw jack assembly 100 can be used to lift and lower heavier equipment with alignment iterations. It even controls the six degrees of freedom of the equipment.

[0030] In yet another embodiment of the present invention, the self-locking power screw jack assembly 100 can be further used to position a heavy-duty gearbox in its required position without disturbing the internal gear train assembly alignment.

[0031] Although a particular exemplary embodiment of the invention has been disclosed in detail for illustrative purposes, it will be recognized by those skilled in the art that variations or modifications of the disclosed invention, including the rearrangement in the configurations of the parts, changes in steps and their sequences may be possible. Accordingly, the invention is intended to embrace all such alternatives, modifications, and variations as may fall within the spirit and scope of the present invention.

[0032] The foregoing descriptions of specific embodiments of the present invention have been presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously many modifications and variations are possible in light of the above teaching.

ADVANTAGES OF THE INVENTION:
[0033] The present invention provides a power screw jack assembly that is capable of handling up to 70 tons of weight for heavy gearboxes.
[0034] The present invention provides a power screw jack assembly that is easy to assemble and disassemble.
[0035] The present invention provides a power screw jack assembly with the inclusion of a self-locking mechanism that prevents any slippage of the gearbox during lifting or lowering actions, enhancing load security and operational safety.
[0036] The present invention provides a power screw jack assembly that prevents barring and twisting of the heavier equipment casing.
,CLAIMS:1. A self-locking power screw jack assembly 100, comprising:
a power screw 101 having a threaded rod 10 with a screw head 20 positioned at one end of the threaded rod 10, wherein the power screw 101 is configured to fit within a pre-drilled foundation hole;
a plurality of load bearing attachment 30 positioned at a corner of a pre-drilled foundation hole;
a top locking ring 40 and a bottom locking ring 50 affixed to the power screw 101 to secure its position within the pre-drilled foundation hole;
a bearing 60 assembled on top of the threaded rod 10 through a cap packing 70.

2. The self-locking power screw jack assembly 100 as claimed in claim 1, wherein the threaded rod 10 having a self-locking square thread configuration.

3. The self-locking power screw jack assembly 100 as claimed in claim 1, wherein the center screw holding nuts are used as a load bearing attachment 30.

4. A method for utilizing a self-locking power screw assembly 100 for lifting and lowering a gearbox, comprising the steps of:
a) inserting each power screw 101 into a pre-drilled foundation hole,
b) securing the power screw 101 in place using the load bearing attachment 30 at the four corners of the pre-drilled foundation hole,
c) affixing a top locking ring 40 and a bottom locking ring 50 to the power screw 101 to prevent movement within the foundation hole,
d) installing thrust bearing 60 atop each threaded screw using cap packing 70,
e) rotating plurality of power screws 101 to achieve coordinated lifting and lowering of the gearbox while maintaining precise alignment.

5. The method as claimed in claim 4,wherein the pre-drilled foundation hole diameter having the diameter of 105 mm.