CN2392020Y

CN2392020Y - Four split, strong force upset bolt

Info

Publication number: CN2392020Y
Application number: CN 99229167
Authority: CN
Inventors: 窦小平
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-08-12
Filing date: 1999-08-12
Publication date: 2000-08-16
Anticipated expiration: 2009-08-12

Abstract

The utility model relates to a four-piece type strong force expansion screw which is provided with an expansion tube which is sleeved with a fixed ring on one end and composed of four expansion pieces. The other end of the expansion tube, which is far from the fixed ring, is sleeved with a spring ring, a threaded rod, one end part of which is in a four-side cone shape penetrates through the middle part of the expansion tube, and the threaded end of the threaded rod extends to the external side of the fixed ring. The threaded end outside the fixed ring is provided with a shim and a screw cap, and the position in the expansion tube, which corresponds to the end part of the four-side cone shape threaded rod, is provided with a four-side cone shape hollow cavity. The utility model has the advantages of convenient use, excellent fastening ability, safety and reliability.

Description

The powerful setscrew of four-piece type

The utility model relates to a kind of fastening piece, particularly a kind of setscrew.

Setscrew kind in the market is a lot, as the patent No. is that ZL96204476, name are called the utility model patent of " setscrew ", a kind of setscrew is disclosed, comprise expand tube, screw bolt and nut, it is characterized in that: expand tube is combined by intumescent sheet, the lower end of intumescent sheet and middle part are fixed by retaining ring and elastic steel traveler respectively, and tapered cup nut is arranged in the sliding-groove on expand tube top, and link with bolt.Though above-mentioned patent can overcome the shortcoming that the conventional expanded screw uses effort, tightness difference, in use have hidden danger: tapered cup nut can skid in the expand tube sliding-groove, and bolts and nuts may produce transfer, thereby reliability is not high when using.

The purpose of this utility model be design a kind of use easy and convenient, tightness good and safe and reliable four-piece type brute force setscrew.

The technological scheme that realizes above-mentioned purpose is as follows: the powerful setscrew of four-piece type, have an end and be with the expansion tube of retainer ring, expansion tube is with a spring ring outward away from the other end of retainer ring, one screw rod passes the expansion tube middle part and its threaded end extend out to outside the retainer ring, the outer threaded end of retainer ring is provided with pad and nut, expansion tube is made up of four intumescent sheets, each intumescent sheet end inwall has an inclined-plane, corresponding to intumescent sheet, its thickness is that the end is the thinnest, four intumescent sheets lump together and form a four sides conical cavity, and the screw rod end in the four sides conical cavity of expansion tube corresponds to the four sides taper.

As further technical measures of the present utility model, have the spring ring groove that can embed spring ring on the aforesaid intumescent sheet (11); The intumescent sheet end has the retainer ring groove that can prevent that retainer ring breaks away from.

As further technical measures of the present utility model, aforesaid intumescent sheet (11) outer surface has some roads intumescent sheet groove.

Screw rod of the present utility model end is designed to the four sides interior four sides conical cavity of taper and expansion tube and cooperates, effectively prevent the transfer of screw rod and nut, expansion tube is combined by four intumescent sheets, make the expansion tube expansive force even, the intumescent sheet surface has the intumescent sheet groove, increased the surface friction drag between expansion tube and contact, thus the utlity model has use easy and convenient, tightness good and safe and reliable advantage.

Fig. 1 is the utility model outline drawing;

Fig. 2 is the fractionation structural representation of Fig. 1.

Below in conjunction with accompanying drawing in detail embodiment is described in detail: the powerful setscrew of four-piece type, one end of expansion tube 1 is with retainer ring 2, expansion tube 1 is with spring ring 4 outward away from the other end of retainer ring 2, screw rod 3 passes expansion tube 1 middle part and its threaded end 31 extend out to outside the retainer ring 2, retainer ring 2 outer threaded end 31 are provided with pad 32 and nut 33, expansion tube 1 is made up of four intumescent sheets 11, it is the thinnest inclined-plane 111, end corresponding to its thickness of intumescent sheet that each intumescent sheet 11 end inwall has one, intumescent sheet 11 outer surfaces have some roads 15 4 intumescent sheets of intumescent sheet groove and lump together formation one four sides conical cavity 12, and screw rod 3 ends in the four sides conical cavity 12 of expansion tube 1 correspond to four sides taper 34.Have spring ring groove 13 on each intumescent sheet 11, and its end has retainer ring groove 14.Spring ring 4 embeds in the expansion tube 1 lip-deep spring ring groove 13, and expansion tube 1 relies on retainer ring groove 14 to fix retainer ring 2.

Claims

1, the powerful setscrew of four-piece type, have an end and be with the expansion tube (1) of retainer ring (2), expansion tube (1) is with a spring ring (4) outward away from the other end of retainer ring (2), one screw rod (3) passes expansion tube (1) middle part and its threaded end (31) extend out to outside the retainer ring (2), the outer threaded end (31) of retainer ring (2) is provided with pad (32) and nut (33), it is characterized in that: expansion tube (1) is made up of four intumescent sheets (11), each intumescent sheet (11) end inwall has an inclined-plane (111), corresponding to intumescent sheet, its thickness is that the end is the thinnest, four intumescent sheets lump together and form a four sides conical cavity (12), and screw rod (3) end in the four sides conical cavity (12) of expansion tube (1) corresponds to four sides taper (34).

2, the powerful setscrew of four-piece type according to claim 1 is characterized in that: have the spring ring groove (13) that can embed spring ring (4) on the described intumescent sheet (11); Intumescent sheet (11) end has the retainer ring groove (14) that can prevent that retainer ring (2) breaks away from.

3, the powerful setscrew of four-piece type according to claim 1 and 2, it is characterized in that: described intumescent sheet (11) outer surface has some road intumescent sheet grooves (15).