CN2396222Y

CN2396222Y - Self-driving expansion screw

Info

Publication number: CN2396222Y
Application number: CN 99212259
Authority: CN
Inventors: 王剑刚
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-26
Filing date: 1999-05-26
Publication date: 2000-09-13
Anticipated expiration: 2009-05-26

Abstract

The utility model relates to a self-driving expansion screw. The self-driving expansion screw is formed by that a self-driving prong is arranged in the front of an expansion head of a screw bolt; the self-driving prong and the sleeve surface of an expansion sleeve are provided with self-driving screw threads which are mutually connected; the screw bolt and the inner sleeve surface on the back of the expansion sleeve are spirally matched; the direction of the spirally matched screw threads is opposite to the direction of the self-driving screw threads, and the tail end of the expansion sleeve is provided with a radial square head; the tail end of the screw bolt is fixedly provided with a threaded rod, and the direction of screw threads of the threaded rod is identical with the direction of the self-driving screw threads; the threaded rod is rotationally provided with a square nut, and the square surface of the square nut is matched with the square surface of the square head. The utility model has the advantages of automatic driving, skid prevention, and backstop. The utility model has the wide application value for the fixation of objects which frequently move and vibrate.

Description

The self tapping swell fixture

The utility model relates to a kind of self tapping swell fixture.

Existing swell fixture is made of bolt, nut and expansion sleeve, and the afterbody of bolt has the screw thread that cooperates with the nut spiral, and the head of bolt has expansion-head, and the head of expansion sleeve has the expanding petal that separates by notch.During use swell fixture is inserted in the hole accomplish fluently in advance, bolt is extracted out made expansion-head, thereby swell fixture is fastened on realize on the hole wall of hole fixing to object the expanding petal distending by screwing nut.The precondition of this fastening means is that the size of hole is thicker than swell fixture; this situation is not have big problem for the fastening of static object; but for some often rock or object fastening of often vibration not too adapt to, finally can cause the loosening of swell fixture and take off.

At above-mentioned the deficiencies in the prior art, the purpose of this utility model is to provide a kind of self tapping swell fixture, to strengthen the fastening ability of swell fixture.

In order to achieve the above object, the technical solution of the utility model is to have adopted a kind of self tapping swell fixture, comprise expansion sleeve and bolt, also has a self tapping tip that matches with the expansion sleeve circumferential surface before the expansion-head of bolt, on this self tapping tip and the expansion condom face the mutual Thread Forming TF that is connected is arranged, in the rear portion of bolt and expansion sleeve between the cover face spiral cooperate, the hand of spiral that this spiral cooperates is opposite with above-mentioned Thread Forming TF direction, at the tail end of expansion sleeve one radially square toes are arranged, tail end at bolt has one section micro screw, the hand of spiral of micro screw is identical with the direction of above-mentioned Thread Forming TF, its spiral shell footpath is less than the spiral shell footpath of bolt, spiral is combined with a square nut on this micro screw, and the square toes of this square nut and above-mentioned square toes match.

The screw length of described square nut can connect a hook by spiral greater than the length of micro screw on the outer screw socket of square nut.

Owing to be provided with Thread Forming TF on self tapping tip of the present utility model and the expansion sleeve face, make the function that the utlity model has tapping screw, for in the hole of some soft materials fixedly the time, bore hole size can be littler, utilize self tapping function of the present utility model to screw in, increased the combination force of the utility model and hole wall, prevented the loosening of swell fixture and withdraw from; For in the Dongting Lake of the hole of some hard materials fixedly the time, Thread Forming TF of the present utility model not only can be used for shooting of swell fixture, also can be used for anti-skidding behind the distending of expanding petal, has prevented the loosening of swell fixture equally and withdraws from.

Below in conjunction with accompanying drawing the utility model is explained and explanation with further:

Fig. 1 is embodiment's 1 an of the present utility model structural representation;

Fig. 2 is embodiment's 2 an of the present utility model structural representation.

Embodiment 1 is as Fig. 1, in the present embodiment, swell fixture is made of bolt 4, expansion sleeve 5, also has a self tapping tip 1 before bolt 4 expansion-head, the front end sleeve face of expanding petal 3 parts of the afterbody of self tapping tip 1 and expansion sleeve 5 coincide naturally, be provided with the Thread Forming TF 2 of forward on the surface of self tapping tip 1 and expansion sleeve 5, at the tail end of expansion sleeve 5 radially six side's square toes 7 are arranged, in the rear portion of bolt 4 and expansion sleeve 5 between the cover face spiral cooperate, the direction of the screw thread 6 that this spiral cooperates be and reverse anti-of screw thread 2.Tail end at bolt 4 is fixed with the together micro screw 11 of center line, plus thread 10 is arranged on the micro screw 11, the spiral shell footpath of plus thread 10 is less than the spiral shell footpath of screw thread 6, spiral is combined with one or six square nuts 8 on micro screw 11, six aspects of six square nuts 8 are corresponding with six aspects of six side's square toes 7 to coincide, and the screw length of six square nuts 8 is grown about one times than the length of micro screw 11.Also can screw in a hook 9 in the afterbody screw socket of six square nuts 8 of present embodiment, be used for the hook object.

Embodiment 2 as shown in Figure 2, the structure situation of present embodiment is with embodiment 1, different are self tapping tip 1 is anti-silk with Thread Forming TF 12 on the expansion sleeve 3, and screw rod 4 be positive silk with the spiral matching thread 13 at expansion sleeve rear portion, and the screw thread 14 on the micro screw 11 be instead thread.In addition, present embodiment has shown not the situation with hook.

With embodiment 1 is that example illustrates using method of the present utility model.During use, on fixed object, hole earlier, square toes 7 and nut 8 suitably less than the radial dimension of expansion sleeve 5, the self tapping tip of swell fixture wedging boring, are blocked with wrench or box spanner then more in the lump in the aperture of boring, be rotated in the forward swell fixture is screwed in, after treating that an expansion sleeve all screws in, block nut 8 separately with wrench again and be rotated in the forward, screw rod 4 is slowly screwed out, thereby the self tapping tip is pressed on four expanding petals 3 on the hole wall in the process that withdraws from, has reached fastening purpose.Thread Forming TF of the present utility model has the effect of shooting with anti-skidding retaining concurrently.

Embodiment 2 usage mode is with embodiment 1, and only the direction that screws out of the direction that is screwed into of swell fixture and bolt 4 is opposite, describes no longer one by one at this.

Claims

1, a kind of self tapping swell fixture, comprise expansion sleeve and bolt, it is characterized in that also having before the expansion-head of bolt a self tapping tip that matches with the expansion sleeve circumferential surface, on this self tapping tip and the expansion condom face the mutual Thread Forming TF that is connected is arranged, in the rear portion of bolt and expansion sleeve between the cover face spiral cooperate, the hand of spiral that this spiral cooperates is opposite with above-mentioned Thread Forming TF direction, at the tail end of expansion sleeve one radially square toes are arranged, tail end at bolt has one section micro screw, the hand of spiral of micro screw is identical with the direction of above-mentioned Thread Forming TF, its spiral shell footpath is less than the spiral shell footpath of bolt, spiral is combined with a square nut on this micro screw, and the square toes of this square nut and above-mentioned square toes match.

2, swell fixture according to claim 1 is characterized in that the length of the screw length of described square nut greater than micro screw, can connect a hook by spiral on the outer screw socket of square nut.