CN2646457Y

CN2646457Y - Stopper expansion bolt

Info

Publication number: CN2646457Y
Application number: CN 03269877
Authority: CN
Inventors: 胡会永
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-09-04
Filing date: 2003-09-04
Publication date: 2004-10-06
Anticipated expiration: 2013-09-04

Abstract

The utility model discloses a backstop expansion bolt used as mechanical connecting piece. The structure is that a screw thread end of the bolt bar is connected with a nut, and the screw thread end of the bolt bar is provided with an axial inner hole and an opening slot; an expanding block is inserted in the hole, and is provided with a push rod. By changing the form of the screw thread of the bolt bar which is connected with the expanding block impelled by the nut, the expanding block will be pushed during the screw in of the nut, and the part exposed out of the screw hole of the nut is opened, thus the nut will be locked. The utility model can prevent effectively the bolt form dismounting by external force, which improves the defensive and protective performance to the components connected, thus being suitable for the connection of component which is easy to be stolen. The connecting piece has simple structure, tight installation without special tools, and very convenient operation.

Description

A kind of retaining EXPANSION ANCHOR BOLTS

Technical field

The utility model relates to a kind of mechanical links, specifically a kind of retaining EXPANSION ANCHOR BOLTS.

Background technique

Existing attachment bolt is that the end at tightening latch has the bolt cap, and the other end car is shaped on screw thread, at this threaded end nut that spins.Because nut can be screwed on arbitrarily and backs out, and does not have stopping function, the therefore effect that can not play anti-theft protection to the mechanism that connected or parts.Traditional expansion bolt is as fastening piece, and fastened body is fastened on the body of wall.Its structure is to be with expand tube outside tightening latch, and the bolt cap end of tightening latch is changed system into tapered protrusion.By the spin tension of nut, the tapered protrusion of tightening latch is strutted the expand tube inner end, thereby EXPANSION ANCHOR BOLTS is fixed on the body of wall at the tightening latch threaded end.This EXPANSION ANCHOR BOLTS can be dismantled, thereby does not have theftproof performance.

The model utility content

The purpose of this utility model just provides a kind of retaining EXPANSION ANCHOR BOLTS that has the anti-theft protection function and use as permanent coupling.

The utility model is achieved in that the retaining EXPANSION ANCHOR BOLTS is made up of tightening latch, expand piece and nut, at the threaded end of the tightening latch nut that spins, the threaded end of tightening latch has axial bore and the opening slot more than three, the grafting taper type piece that expands in the endoporus, reliable nut precession on the piece that expands and push piece that the piece that will expand advances to endoporus.Action principle of the present utility model is analogous to the action principle of the EXPANSION ANCHOR BOLTS of using as fastening piece.Promptly, make the end of this threaded end be decomposed into several lobe parts by holing at the threaded end of tightening latch and establishing out the Qian groove.The piece that will expand inserts the tightening latch endoporus, and nut again spins.Nut advances the piece that expands by push piece in the precession of tightening latch threaded end.Taper type expands piece when being pushed into, and the bar lobe end of gradually the tightening latch threaded end being exposed the nut screw struts.Become big because the bar lobe end of threaded end struts the back diameter, thereby nut can't be withdrawed from.Push piece if will expand again on the piece conceals in the nut, can make bloated piece and nut realize permanent interlocking.

The utility model can prevent effectively that attachment bolt from being unloaded by external force, has improved the defence protective value to institute's coupling member, thereby has been applicable in the connection of easy-stealing part.This connected piece structure is simple, install fastening need not special tool, operate very easy.

Description of drawings

Fig. 1, Fig. 2 are the structural representations of two kinds of implementations of the utility model.

Embodiment

Embodiment 1: as shown in Figure 1, the left end of tightening latch 1 has outside thread, and is drilled with axial bore 1a, and endoporus has tapering.Be processed with opening slot 1b in the endoporus side.Opening slot can have more than three, is divided into several lobe parts with the threaded end with limit, tightening latch hole.The threaded end of tightening latch 1 preferably has four uniform opening slot 1b.Opening slot is too much, can reduce the intensity of tightening latch threaded end bar lobe part, and the retaining of nut is decreased.If 1-2 opening slot only arranged, then can not or be difficult to the bar lobe partly be strutted, thereby can not play the retaining effect by the piece that expands.

The piece 2 that expands is a taper type, and the push piece on the piece that expands is the pin 4 of pegging graft on the convex column outside the piece medial extremity that expands, and the length of pin is greater than the diameter of tightening latch 1, and the pin diameter is less than the width of tightening latch threaded end opening slot.Medial extremity at nut 3 has the annular groove 3a of diameter greater than pin length.When the piece 2 that expands was inserted the endoporus 1a of tightening latch 1 threaded end, the upper and lower end of the pin 4 on the piece front end that expands snapped in respectively in the corresponding opening slot.Spin behind the nut 3, the inboard annular groove 3a on the nut 3 covers the exposed junction of pin 4.Nut promotes pin 4 in precession, drive the endoporus jacking of piece 2 to tightening latch 1 of expanding.The bar lobe end of the tightening latch threaded end that exposes after the nut precession is just strutted gradually by bloated piece.When nut was screwed, himself was also locked by the bar lobe part that threaded end struts.

Embodiment 2: as shown in Figure 2, the structural type of tightening latch 1 and embodiment's 1 is basic identical, and just the identical length of the endoporus 1a degree of depth of threaded end and opening slot 1b is to reducing.The threaded end of tightening latch 1 also preferably has four uniform opening slot 1b.Push piece on the bloated piece 2 is at the pylon 4 of piece 2 outboard ends that expands, and the pylon diameter is less than the screwhole diameter of nut 3, and the sealing of the outboard end of nut 3 is shaped on the cavity 3b of aperture greater than screwhole diameter in medial extremity the inside.The piece 2 that will expand inserts tightening latch 1 threaded end endoporus 1a, the nut 3 that spins, and the pylon 4 of piece 2 outboard ends that expand passes the screw of nut 3, withstands on the cavity inner face of nut 3.Nut promotes pylon 4 in precession, thereby the piece 2 that promotes to expand is to the endoporus 1a of tightening latch 1 jacking.When the bar lobe front end of tightening latch threaded end enters in the cavity 3b in the nut 3, just strutted by bloated piece 2 gradually.When nut was screwed, himself was also locked by the bar lobe part that threaded end struts.

Claims

1, a kind of retaining EXPANSION ANCHOR BOLTS, at the threaded end of tightening latch (1) nut (3) that spins, the threaded end that it is characterized in that tightening latch has axial bore (1a) and the opening slot more than three (1b), the grafting taper type piece (2) that expands in the endoporus (1a), reliable nut (3) precession on the piece that expands and push piece (4) that the piece that will expand advances to endoporus.

2, retaining EXPANSION ANCHOR BOLTS according to claim 1, it is characterized in that the push piece on the bloated piece (2) is the pin (4) of pegging graft on the convex column outside the piece medial extremity that expands, the length of pin is greater than the diameter of tightening latch (1), the pin diameter is less than the width of tightening latch threaded end opening slot (1b), has the annular groove (3a) of diameter greater than pin length at the medial extremity of nut (3).

3, retaining EXPANSION ANCHOR BOLTS according to claim 1, it is characterized in that the push piece on the bloated piece (2) is at the pylon (4) of piece outboard end that expands, the pylon diameter is less than the screwhole diameter of nut (3), the outboard end sealing of nut (3) is shaped on the cavity (3b) of aperture greater than screwhole diameter in medial extremity the inside.

4, retaining EXPANSION ANCHOR BOLTS according to claim 1 and 2 is characterized in that the threaded end of tightening latch (1) has uniform four opening slots (1b).