Adjustable jacking for building template

Abstract

The utility model relates to the technical field of building construction tools, and discloses an adjustable jacking for a building template, which comprises a screw rod, a nut screwed on the screw rod and a bracket fixed at the top of the screw rod, the nut is rotationally connected into the shell, a worm is rotationally connected into the shell, a worm gear is formed on the outer wall of the middle of the nut, and the worm gear is meshed with the worm. The worm gear and the worm can be matched with an electric wrench to work, so that the adjusting efficiency of the bracket can be effectively improved, and the jacking support can be conveniently mounted and dismounted; and meanwhile, the nut can be tightened with smaller force.

Description

Technical Field

[0001] The utility model relates to the technical field of construction tools, and particularly relates to an adjustable jack for building formwork. Background Art

[0002] The existing adjustable jack includes a screw rod, a nut and a bracket. A pair of supporting ears are arranged outside the nut, and the supporting ears are used for rotating the nut so as to adjust the height of the bracket. The adjusting efficiency of the bracket of the existing adjustable jack is relatively low, and the nut is not easy to tighten. Content of the Utility Model

[0003] The purpose of the utility model is to provide an adjustable jack for building formwork. By arranging a worm and a worm gear, it can cooperate with an electric wrench to work, effectively improving the adjusting efficiency of the bracket and facilitating the installation and disassembly of the jack; meanwhile, the nut can be tightened with a smaller force.

[0004] The above technical purpose of the utility model is achieved through the following technical solutions:

[0005] An adjustable jack for building formwork includes a screw rod, a nut screwed on the screw rod, and a bracket fixed at the top of the screw rod; the nut is rotatably connected in a shell, a worm is rotatably connected in the shell, a worm gear is formed on the outer wall of the middle part of the nut, and the worm gear meshes with the worm.

[0006] Through the above technical solution, the worm is driven to rotate by a tool, the worm drives the worm gear to rotate, and the worm gear drives the screw rod to move up or down, so as to realize the installation or disassembly of the jack. If the tool is a power tool, such as an electric wrench, the installation or disassembly efficiency of the jack can be improved. If it is a manual tool, due to the rotation ratio of the worm gear and the worm, the force can be reduced and the locking force can be improved.

[0007] The utility model is further arranged as: the nut further includes two stepped cylindrical bodies arranged up and down;

[0008] A worm gear hole and snap rings on the inner walls at the upper and lower ends of the worm gear hole are formed in the middle of the shell. The inner diameter of the snap ring is in clearance fit with the outer diameter of the small end of the stepped cylindrical body, and the stepped surface of the stepped cylindrical body is placed inside the snap ring;

[0009] The shell further includes a worm hole communicated with one side of the worm gear hole; the worm hole includes a middle large hole and end small holes arranged at both ends of the middle large hole; the length of the middle large hole is in clearance fit with the length of the helical tooth part of the worm; the outer diameter of the two end smooth rods of the worm is in clearance fit with the aperture of the end small holes.

[0010] Through the above technical solution, the nut can only move slightly axially in the housing by the block of the snap ring on the step surface of the stepped cylinder, which can prevent the nut from jamming; the nut can rotate in the housing by the action of the snap ring on the small end of the stepped cylinder;

[0011] The axial movement direction of the spiral tooth part of the worm can be restricted by the step surface between the middle large hole and the end small hole.

[0012] The utility model is further arranged as: the housing is formed by splicing two symmetrically arranged half-housings, which is convenient for installing the nut into the housing. The two half-housings can be connected by screws or fixed by welding.

[0013] The utility model is further arranged as: a pair of support ears are fixed at the extending end of the upper stepped cylinder extending out of the housing. The nut can also be rotated directly by rotating the support ears, retaining the feasibility of manual operation.

[0014] The utility model is further arranged as: a polygonal hole or a polygonal cylinder is formed at the end of the worm. The polygonal hole can be a square hole or a regular hexagonal hole, and the polygonal cylinder can be a regular quadrangular prism or a regular hexagonal prism, etc. The corresponding tool can be installed on an electric wrench and then inserted into the polygonal hole or the polygonal cylinder, so as to drive the worm to rotate by the electric wrench.

[0015] The utility model is further arranged as: a counterbore is formed at the bottom of the lower stepped cylinder, and the diameter of the counterbore is larger than the maximum diameter of the threaded hole of the nut.

[0016] Since the lower stepped cylinder contacts the lower steel pipe, the lower end face of the lower stepped cylinder is prone to deformation. By setting the counterbore, the thread deformation of the nut can be reduced, so as to ensure the smooth rotation of the screw.

[0017] The prominent effect of the utility model is:

[0018] Compared with the prior art, by setting the worm and worm gear, it can cooperate with the electric wrench to work, effectively improving the adjustment efficiency of the bracket and facilitating the installation and disassembly of the jack; at the same time, the nut can be tightened with a smaller force. Brief Description of the Drawings

[0019] Figure 1 is a schematic structural diagram of the utility model;

[0020] Figure 2 is a sectional view of the utility model;

[0021] Figure 3 is Figure 2 a partial enlarged view of A;

[0022] Figure 4 is Figure 3Cross-sectional view taken along line B-B.

[0023] Reference numerals: 10, screw;

[0024] 20, nut; 201, worm gear; 202, stepped cylinder; 203, support ear; 204, counterbore;

[0025] 30, bracket;

[0026] 40, housing; 41, worm; 400, half housing;

[0027] 401, worm gear hole; 402, snap ring; 403, worm hole. Detailed implementation manners

[0028] The following will further describe in detail the specific implementation manners of the present utility model in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0029] The following is a reference Figures 1 to 4 to illustrate the present utility model:

[0030] An adjustable jack for building formwork includes a screw 10, a nut 20 screwed on the screw 10, and a bracket 30 fixed to the top of the screw 10; the nut 20 is rotatably connected in a housing 40, a worm 41 is rotatably connected in the housing 40, a worm gear 201 is formed on the outer wall of the middle part of the nut 20, and the worm gear 201 meshes with the worm 41.

[0031] Drive the worm to rotate through a tool, the worm drives the worm gear to rotate, and the worm gear drives the screw to move up or down, so as to realize the installation or disassembly of the jack. If the tool is a power tool, such as an electric wrench, the installation or disassembly efficiency of the jack can be improved. If it is a manual tool, due to the rotation ratio of the worm gear and the worm, the force can be reduced and the locking force can be improved.

[0032] The nut 20 further includes two stepped cylinders 202 arranged up and down;

[0033] The middle part of the housing 40 is formed with a worm gear hole 401 and snap rings 402 on the inner walls at the upper and lower ends of the worm gear hole 401. The inner diameter of the snap ring 402 is set with a clearance fit with the outer diameter of the small end of the stepped cylinder 202, and the stepped surface of the stepped cylinder 202 is placed inside the snap ring 402;

[0034] The housing 40 further includes a worm hole 403 communicated with one side of the worm gear hole 401; the worm hole 403 includes a middle large hole and end small holes arranged at both ends of the middle large hole; the length of the middle large hole is set with a clearance fit with the length of the helical tooth part of the worm 41; the outer diameter of the smooth rods at both ends of the worm 41 is set with a clearance fit with the aperture of the end small holes.

[0035] The blocking of the stepped surface of the stepped column by the snap ring enables the nut to only move axially to a small extent within the housing, preventing the nut from jamming; the action of the snap ring on the small end of the stepped column enables the nut to rotate within the housing;

[0036] The stepped surface between the middle large hole and the end small hole can limit the axial movement direction of the helical tooth part of the worm.

[0037] The housing 40 is formed by splicing two symmetrically arranged half-housings 400, which is convenient for installing the nut into the housing. The two half-housings can be connected by screws or fixed by welding.

[0038] A pair of lugs 203 are fixed to the protruding end of the upper stepped column 202 extending outside the housing 40. The nut can also be rotated directly by rotating the lugs, retaining the feasibility of manual operation.

[0039] The end of the worm 41 is formed with a polygonal hole 411 or a polygonal column. The polygonal hole can be a square hole, a regular hexagonal hole, etc., and the polygonal column can be a regular quadrangular prism, a regular hexagonal prism, etc. The corresponding tool can be installed on the electric wrench and then inserted into the polygonal hole 411 or the polygonal column, so as to drive the worm to rotate by the electric wrench.

[0040] A counterbore 204 is formed at the bottom of the lower stepped column 202, and the diameter of the counterbore 204 is larger than the maximum diameter of the threaded hole of the nut 20.

[0041] Since the lower stepped column contacts the lower steel pipe, the lower end face of the lower stepped column is prone to deformation. By setting the counterbore, the thread deformation of the nut can be reduced, thus ensuring the smooth rotation of the screw.

[0042] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made. These improvements and modifications made under the above assumptions should also be regarded as the protection scope of the present invention.

Claims

1. An adjustable top support for a building template, comprising a screw rod (10), a nut (20) screwed onto the screw rod (10), and a bracket (30) fixed to the top of the screw rod (10); characterized in that: The nut (20) is rotatably connected in the housing (40), a worm (41) is rotatably connected in the housing (40), a worm wheel (201) is formed on the middle outer wall of the nut (20), and the worm wheel (201) is meshed with the worm wheel (41).

2. The adjustable top support for building formwork according to claim 1, characterized in that: The nut (20) further comprises two stepped columns (202) arranged vertically; A worm gear hole (401) and a snap ring (402) are formed in the middle of the housing (40) on the inner walls at the upper and lower ends of the worm gear hole (401); the inner diameter of the snap ring (402) is arranged to be clearance-matched with the outer diameter of the small end of the step column (202); and the step surface of the step column (202) is placed on the inner side of the snap ring (402); The housing (40) further comprises a worm hole (403) arranged in communication with one side of the worm wheel hole (401); the worm hole (403) comprises a middle large hole and end small holes arranged at both ends of the middle large hole; the length of the middle large hole is arranged to be clearance matched with the length of the spiral tooth portion of the worm (41); the outer diameter of the polished rods at both ends of the worm (41) is clearance matched with the aperture of the end small holes.

3. The adjustable top support for building formwork according to claim 2 is characterized in that: The shell (40) is formed by splicing two symmetrically arranged half shells (400).

4. The adjustable top support for building formwork according to claim 2, characterized in that: A pair of supporting ears (203) are fixed to the protruding end of the upper step column (202) extending outside the housing (40).

5. The adjustable jacking support for building formwork according to claim 2, characterized in that: The end of the worm (41) is formed with a polygonal hole (411) or a polygonal cylinder.

6. The adjustable top support for building formwork according to claim 2, characterized in that: A countersunk hole (204) is formed at the bottom of the lower step column (202), and the diameter of the countersunk hole (204) is larger than the maximum diameter of the threaded hole of the nut (20).

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