CN102644640A

CN102644640A - Bidirectional reverse-propelling fastening bolt

Info

Publication number: CN102644640A
Application number: CN2012101152977A
Authority: CN
Inventors: 朱明龙
Original assignee: 余爱芳
Priority date: 2012-04-10
Filing date: 2012-04-10
Publication date: 2012-08-22

Abstract

The invention relates to a bidirectional reverse-propelling fastening bolt, wherein the current single expansion pipe at the lower end is changed into a two-end expansion pipe; the lower side of a screw cap is manufactured into a converse cone shape; the fastening bolt is used for fastening a screw with an introduction type expansion bolt at the lower end; in the event of guiding the expansion bolt at the lower end of the screw to be wedged in a lower opening of the expansion pipe, the converse cone body at the lower side of the screw cap can also be wedged in an upper opening of the expansion pipe; two ends of the expansion pipe are expanded at the same time so as to be effectively clamped on the inner wall of an installation hole; and the fastening bolt can be prevented from becoming loose because of external force.

Description

Two-way against advancing clamping bolt

Technical field:

The present invention relates to a kind of fastening equipment, especially a kind of two-way against advancing clamping bolt.

Background technique:

Used clamping bolt has only the single expansion in expansion tube lower end at present, when installation, if the internal diameter of mounting hole is too compact, will strengthen difficulty of construction, and all that has been achieved is spoiled even easily screw rod is deflected.But if beat the mounting hole internal diameter looser, again can be in the expansion tube upper end with leaving gap between the mounting hole inwall, if the fastener quality receives powerful external impacts more greatly or often, expansion tube can shake, and long-drawn-outly promptly possibly get loose fully.

Summary of the invention:

In order to eliminate the relevant drawback of existing clamping bolt, the present invention provides a kind of two-way contrary clamping bolt that advances, and it is characterized in that expansion tube two can both expand tightly to block mounting hole.The present invention implements with following mode: 1, the upper/lower terminal with expansion tube all carves the expansion breach; 2, will process the rounding stage body with the corresponding nut downside of introduction formula screw rod that the lower end has an expansion bolt; The external diameter of rounding stage body lower edge is slightly smaller than the expansion tube internal diameter, and its top is equal to the maximum diameter of the expansion bolt that the screw rod lower end had with the external diameter of nut connecting part.Benefit of the present invention is; Can beat the mounting hole internal diameter loose a little during installation with convenient construction; And when rotary nut screw lower end with expansion bolt wedge when advancing the expansion tube end opening; It is suitable for reading that rounding stage body in the nut also can be wedged expansion tube simultaneously, makes the two ends up and down of expansion tube expand equally and be stuck on the mounting hole inwall, guarantees that clamping bolt does not shake.

Description of drawings:

Fig. 1 is existing introduction formula clamping bolt application state figure; Fig. 2 is carved with the expansion tube of expansion breach for two ends; Fig. 3 is the contained nut External view of the present invention; Fig. 4 is the profile in elevation of Fig. 3; Fig. 5 is the contained screw rod External view of the present invention; Fig. 6 is an assembled state schematic representation of the present invention; Fig. 7 is an application state sectional view of the present invention.Among the figure, the 1st, existing nut, the 2nd, introduction formula screw rod, the 3rd, compression spring; The 4th, existing expansion tube, the 5th, expansion tube and mounting hole inwall gap, the 6th, the mounting points basis, the 7th, expansion tube is suitable for reading; The 8th, screw flight, the 9th, introduction formula screw rod carries expansion bolt, and the 10th, the nut outer rim; The 11st, nut rounding stage body end opening, the 12nd, nut inner thread, the 13rd, expansion tube end opening.

Embodiment:

Screw rod shown in Figure 5 held through expansion tube end opening (3) shown in Figure 2 from it wear; Put into mounting hole then; Fastener is inserted in from the screw rod upper end through its mount inlet; Be inserted in compression spring (3) in the screw rod outside being exposed to the fastener mount inlet, again Fig. 3, nut shown in Figure 4 screwed through screw flight (8) from its rounding stage body end opening (11), make the screw rod lower end expansion bolt and nut downside the rounding stage body respectively wedge advance the end opening of expansion tube and suitable for reading.

Claims

1. the two-way contrary clamping bolt that advances is characterized in that the expansion breach all is carved with at the expansion tube two ends in the clamping bolt.

2. according to claim 1 two-way against advancing clamping bolt; It is characterized in that the supporting nut downside of screw rod that carries expansion bolt with the lower end is a rounding stage body, it is suitable for reading and impel expansion tube expansion suitable for reading and be stuck on the mounting hole inwall that expansion tube can be wedged in the lower end of this rounding stage body.