Expansion screw
An expansion screw and screw technology, which is applied to pins, connecting components, mechanical equipment, etc., can solve the problems of low tension force, complex structure of metal expansion screws, and poor durability, and achieve simple processing, good social benefits, and improved expansion. degree of effect
Inactive Publication Date: 2013-11-20
WUJIANG LILI JIANXING CASTING FACTORY
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Problems solved by technology
[0002] The traditional expansion screw expands through a plastic or metal shell, but the plastic shell type expansion screw has the problem of poor durability and low tension force, while the metal expansion screw has a more complicated structure, and the above two expansion screws do not have self-tapping function of
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Embodiment Construction
[0016] Do further description below in conjunction with accompanying drawing:
[0017] Such as Figure 1~2 As shown, the screw includes a screw tip and a nut end, and a screw-shaped round hole 1 is vertically processed inside the expansion screw from the nut end to a distance L from the screw tip, and the inner wall of the screw-shaped round hole 1 is processed There are threads; the expansion screw runs through several V-shaped grooves 2 symmetrically from the inner wall of the screw-shaped round hole 1 toward the outer wall of the screw with the screw axis as the center, and the tip of the B-shaped groove is toward the bottom tip of the screw; the V-shaped groove 2 The tip and the bottom tip of the screw-shaped hole are on the same level; the screw-shaped hole 1 is a gradually expanding structure from the screw top of the screw to the screw nut top end; the diameter of the screw-shaped hole 1 is L1, and the expansion The diameter of the screw is L2, wherein 2 times of L1 is...
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The invention discloses an expansion screw. Compared with a traditional expansion screw, the expansion screw has the advantage that a screw hole is formed in the screw so that the functions of expansion and fastening can be achieved. The expansion screw is fully made of metal materials. The tapping function is achieved by the expansion screw. Meanwhile, the expansion screw is a whole expansion body and is simple in structure and easy to machine. A plurality of V-shaped grooves are formed in the side face of the expansion screw, so that the tapping function is strengthened and the expansion degree of the expansion screw is improved, the expansion screw is prevented from being damaged by too large expansion force, and damage caused by too large or too small expansion force to the screw is avoided. The value of the length of a screw installation circular through hole occupying the whole screw is further defined and the expansion screw is good in social benefits.
Description
technical field [0001] The invention relates to an expansion screw, which belongs to the field of hardware parts. Background technique [0002] The traditional expansion screw expands through a plastic or metal shell, but the plastic shell type expansion screw has the problem of poor durability and low tension force, while the metal expansion screw has a more complicated structure, and the above two expansion screws do not have self-tapping function. Contents of the invention [0003] The purpose of the present invention is to provide a technical solution that can solve the above problems. [0004] The present invention is realized by following method: [0005] An expansion screw, the screw includes a screw tip and a nut end, a screw-shaped hole is vertically processed inside the expansion screw from the nut end to a distance L from the screw tip, and the inner wall of the screw-shaped hole is processed There are threads. [0006] As a further innovation of the present...
Claims
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IPC IPC(8): F16B13/08
Inventor 谈建兴
Owner WUJIANG LILI JIANXING CASTING FACTORY