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Double-convex-fold expansion bolt

A technology of expansion bolts and bolt bodies, applied in the direction of connecting components, pins, mechanical equipment, etc., can solve problems such as bolts prone to side deflection, and achieve the effect of bearing large tensile force, increasing firmness, and not easy to side deflection.

Inactive Publication Date: 2012-03-21
JIANGSU ZHENYA SPECIAL SCREW
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The frustum-shaped nail head and convex strip of this kind of convex expansion bolt can obtain two kinds of expansion degrees for the expansion sleeve at the same time, and the expansion sleeve is double-extruded and firmly fixed on the surrounding wall of the pre-drilled foundation hole. Such an expansion bolt There is only an expansion force point at its end, and the bolt at the other end of the nut is prone to lateral deviation

Method used

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  • Double-convex-fold expansion bolt
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  • Double-convex-fold expansion bolt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] according to figure 1 It can be seen that the double-convex expansion bolt of the present invention includes a bolt body 1, a nut 2 and an expansion sleeve 3, and the bolt body 1 has a truncated conical nail head 4 with a large end as its end, and the truncated conical nail head 4 is provided with protruding strips 7, both ends of the expansion sleeve 3 are provided with notches 5, and between the nut 2 and the expansion sleeve 3 there is a truncated cone-shaped protrusion set on the bolt body 1 6. The frustum-shaped protrusion 6 is provided with a raised line; the notch 5 is a straight line notch, and the raised line 7 is a straight line; the outer side of the expansion sleeve 3 is provided with an outer anti-skid pattern.

Embodiment 2

[0017] according to figure 2 It can be seen that the double-convex expansion bolt of the present invention includes a bolt body 1, a nut 2 and an expansion sleeve 3, and the bolt body 1 has a truncated conical nail head 4 with a large end as its end, and the truncated conical nail head 4 is provided with protruding strips 7, both ends of the expansion sleeve 3 are provided with notches 5, and between the nut 2 and the expansion sleeve 3 there is a truncated cone-shaped protrusion set on the bolt body 1 6. The frustum-shaped protrusion 6 is provided with a convex line; the notch 5 is a spiral notch, and the convex line 7 is a spiral convex line; the outer side of the expansion sleeve 3 is provided with Anti-slip pattern on the outside.

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PUM

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Abstract

The invention discloses a double-convex-fold expansion bolt, which comprises a bolt body, a nut and an expansion sleeve. The bolt body is provided with a cone-shaped nail head with the large end being as a tail end, and the cone-shaped nail head is provided with a convex bar. The double-convex-fold expansion bolt is characterized in that the two ends of the expansion sleeve are provided with a slot, and a cone-shaped bulge is arranged between the nut and the expansion sleeve, is sleeved on the bolt body and is provided with the convex bar. The invention has the advantages that the bolt has high strength, high pulling force bearing capacity and low cost, can be easily manufactured, can be used conveniently and cannot be deflected easily.

Description

Technical field: [0001] The invention relates to the field of fasteners, in particular to a double convex folding expansion bolt. Background technique: [0002] Existing expansion bolts include a bolt body and matching nuts and expansion sleeves. The bolt body has a large end with a frustum-shaped nail head at its end, and the expansion sleeve has an end near the frustum-shaped nail head. A plurality of longitudinal notches, in other words, one end of the expansion sleeve is divided into a plurality of expansion ribs, and the other end is still in a tubular shape. When in use, the nut is tightened, and the frustum-shaped nail head is pressed into the expansion sleeve from the small end to the large end, forcing its expansion rib to expand and deform in a conical shape. Such an expansion bolt only has an expansion force point at its end to support Poor expansion fastening effect. Chinese patent, Publication No. CN101191513A discloses a convex expansion bolt, including a scr...

Claims

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Application Information

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IPC IPC(8): F16B13/06
Inventor 杭汉林
Owner JIANGSU ZHENYA SPECIAL SCREW
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