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Invisible pressing expansion screw

A compact and invisible technology, applied in the direction of connecting components, pins, mechanical equipment, etc., can solve the problems of pedestrians falling, puncturing car tires, unable to form a flat environment, etc., to achieve the effect of maintaining flatness

Active Publication Date: 2011-09-14
睢宁鑫非机械科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

figure 2 Although the pop-up screw has a compression function, the main body screw can also be used twice, but if it is used to fix a suspended workpiece, it is easy to cause the compression spring to get stuck on the workpiece. If it is used to fix a workpiece with a large thickness , the expansion sleeve will still be exposed after disassembly, and cannot form a flat environment, resulting in such figure 1 Pulling out the screws often punctures car tires, causing pedestrians to fall and other safety hazards

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: The main body bolt 1 is integrally formed, the upper casing 4, the compression spring 5, and the expansion tube 2 are sequentially sleeved on the upper part of the screw with a larger diameter of the main body bolt 1, and the frustum-shaped expansion head 3 The internal thread is spirally matched with the external thread of the screw with a smaller diameter at the lower part of the main body bolt 1, such as Figure 5 shown. The structure of the first embodiment is suitable for the case where the diameter of the main body bolt 1 is small, and at this time, there is no special requirement for the equipment for processing the main body bolt 1 with a stepped screw.

Embodiment 2

[0027] Embodiment 2: The stepped screw rod with larger diameter on the upper part of the main body bolt 1 and smaller diameter on the lower part is formed in this way, and an inner sleeve 6 is sleeved on the upper part of the screw rod with uniform diameter, and the inner sleeve 6 is equal to increasing the main body bolt. 1. The diameter of the upper screw; the upper sleeve 4, the compression spring 5 and part of the expansion tube 2 are then sleeved on the inner sleeve 6, and the internal thread of the frustum-shaped expansion head 3 is connected to the lower part of the main body bolt 1 Spiral fit with external thread, such as Figure 8 shown. The structure of the second embodiment is suitable for the case where the diameter of the main body bolt 1 is larger. If the diameter of the main body bolt 1 is larger, directly processing the main body bolt 1 with a stepped screw requires relatively large-scale equipment. In order to save equipment investment, at the same time Energ...

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Abstract

The invention discloses an invisible pressing expansion screw which comprises a main body bolt (1), an upper sleeve (4), a pressing spring (5), an expansion pipe (2) and a round expansion head (3) which are sequentially sleeved on the main body bolt (1), wherein the round expansion head is spirally matched with external screw threads at the lower end part of the main body bolt; and the main body bolt (1), the upper sleeve (4), the pressing spring (5) and the expansion pipe (2) are removably connected together. The pressing spring is concealed in a mounting hole by the invisible pressing expansion screw provided by the invention, and working pieces can not be clamped; the screw is particularly suitable for the mounting construction for fastening thicker projects; and after the invisible pressing expansion screw provided by the invention is removed, the main body bolt can be recycled, the smoothness of the mounting field can be kept, and the screw is environmentally-friendly.

Description

technical field [0001] The invention relates to a fastening screw, in particular to a fastening screw with an invisible compression spring. The fastening screw of the invention is suitable for installing road bridges, guardrails, road pillars, communications, fire protection, venue seats, accessories, etc. Fastening projects such as electrical facilities and steel frame structures, especially suitable for installation projects for fastening thicker workpieces. Background technique [0002] The detonation screw of prior art comprises screw rod, nut, expansion tube, spring meson, flat washer, and its shape structure is as figure 1 As shown, the installation of this kind of pop-up screw is cumbersome, the pressing function is not strong enough, and the main body screw cannot be used repeatedly. No matter after installation or disassembly, the main body screw will expose the long screw head. If it is used to fix the road surface In traffic facilities such as deceleration rubber...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B13/06
CPCF16B13/066F16B13/06
Inventor 温少松
Owner 睢宁鑫非机械科技有限公司
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