CN2589723Y

CN2589723Y - Built-in bolt

Info

Publication number: CN2589723Y
Application number: CN 02294421
Authority: CN
Inventors: 谢社长
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-12-19
Filing date: 2002-12-19
Publication date: 2003-12-03
Anticipated expiration: 2012-12-19

Abstract

The utility model relates to a bolt and a nut, particularly a built-in bolt which is provided with the bolt and the nut. The bolt comprises a bolt head and a bolt rod part, and the bolt rod part is provided with a front rod part and a back rod part. The cross-section of the front rod part is in the shape of a ratchet wheel, and the back rod part is provided with screw threads. The nut is provided with a front nut and a back nut, the outside of the screw hole of the front nut is provided with a pair of detents, and one end of each of the detents is provided with a replacement spring. The detents are engaged with the ratchet wheels on the front rod part, and the screw hole of the back nut is engaged with the screw threads on the back rod part. Because the bolt uses two sections of different structures (the ratchet wheels and the screw thread), and the nut correspondingly uses two sections of different structures (the detents and the screw thread), the looseness and falling off of the bolt can be prevented; in addition, through different detent structures, a movable and openable bolt against reverse, looseness and dropping off can be made, as well as a fixed and permanent bolt against reverse, looseness and dropping off can also be made.

Description

Built-in bolt

(1) technical field

The utility model relates to a kind of screw and nut, especially a kind of built-in bolt.

(2) background technique

Existing bolt is made up of screw, nut, is a kind of important fastening Component.But time one is long, and traditional bolt is on the object of motion because vibration, tend to produce loosening, thereby easy to wear, come off, often lead to major accident and unnecessary loss.Some traditional connection sets particularly, the requirement height of fastening and precision pressure, if adopt electric welding to weld, gap enlargement can not be tightened solid again more in the future; If adopt latch fastening, same easily loosening, and screw rod too short not inserting when getting into the cave is oversize inaccurate again.At present, many communal facilitys in city such as power transformer, sewer cover, license plate and other various machinery, also because of adopting general bolt, and stolen in a large number, because only need common small wrench just can steal easily to general bolt.

(3) summary of the invention

The utility model aims to provide a kind of loose or dislocation that is difficult for, and it is loosening or select permanent fastening built-in bolt also can to select to open anti-retrogression according to demand.

Built-in bolt is provided with screw and nut, and screw comprises screw head and screw part, bar portion and back bar portion before screw part is established, and the cross section of preceding bar portion is ratchet shape, and back bar portion is threaded.Nut and back nut before nut is established, a pair of ratchet is established in the screw outside of preceding nut, and an end of ratchet is established Returnning spring, and ratchet matches with the ratchet of preceding bar portion, and the screw of back nut is identical with the screw thread of back bar portion; The other end of ratchet can be fixed or movable, for stationary structure, in the groove before the other end of ratchet is located at outside the nut screw; For movable structure, in the cavity before the other end of ratchet is located at outside the nut screw, ratchet can rotate around jack shaft, and cavity is to preceding nut peripheral hardware penetration hole, in the time of need opening nut with box lunch, only need 1 shaft, the ratchet of ratchet in the preceding nut and screw can be thrown off, to dismantle down bolt.

In order not influence the fastness of bolt, the ratchet of screw part (preceding bar portion) should be than helical thread portion (back bar portion) overstriking, and preceding nut should strengthen, thicken than back nut, so that enough space mounting ratchets are arranged, assurance has enough fastness.

Because screw adopts two sections different structures (ratchet and screw thread), nut is corresponding also to adopt two sections different structures (ratchet and screw thread), so the utility model can prevent loose or dislocation.Pass through different pawl structures, the bolt that makes the utility model both can make movable openable anti-retrogression, become flexible, come off, the bolt that also can make fixed permanent anti-retrogression, becomes flexible, comes off in addition.

(4) description of drawings

Fig. 1 is the utility model embodiment 1 a structural representation.

Fig. 2 is the preceding bar cross section structural drawing of Fig. 1.

Fig. 3 is the preceding nut cross-sectional structure figure of Fig. 1.

Fig. 4 is the back nut cross-sectional structure figure of Fig. 1.

Fig. 5 is preceding nut cross-sectional structure figure of the utility model embodiment 2.

(5) embodiment

Embodiment 1: shown in Fig. 1～4, the utility model is provided with screw 1 and nut 2, and screw 1 comprises screw head 11, preceding bar portion 12 and back bar portion 13, and the cross section of preceding bar portion 12 is ratchet shape, and back bar portion 13 is threaded.Nut 21 and back nut 22 before nut 2 comprises, 1 pair of ratchet 23 is established in screw 211 outsides of preceding nut 21, and an end of ratchet 23 is established Returnning spring 24, and ratchet 23 matches with the ratchet 14 of preceding bar portion 12, and the screw 221 of back nut 22 coincide with the screw thread of back bar portion 13.Before equal big than back nut of diameter and thickness of nut.

Embodiment 2: as shown in Figure 5, present embodiment is made balanced type with different ratchets 26 of preceding nut 21 that are of the embodiment 1, one end 261 is established Returnning spring 24, the other end 262 is movable, movable axis 27 is established in the centre of ratchet 26, ratchet can rotate in the outboard chambers 28 of preceding nut screw 211 freely, and to preceding nut peripheral hardware penetration hole 29, penetration hole 29 communicates with 262 ends of ratchet 26 at cavity 28.Only need depress ratchet end 262, just can make ratchet 14 disengagements of ratchet 26 and preceding bar portion, open bolt again with a shaft.

Claims

1, built-in bolt is provided with screw and nut, and screw comprises screw head and screw part, it is characterized in that screw part establish before bar portion and back bar portion, the cross section of preceding bar portion is ratchet shape, back bar portion is threaded; Nut and back nut before nut is established, a pair of ratchet is established in the screw outside of preceding nut, and an end of ratchet is established Returnning spring, and ratchet matches with the ratchet of preceding bar portion, and the screw of back nut is identical with the screw thread of back bar portion.

2, built-in bolt as claimed in claim 1 is characterized in that the other end of said ratchet is located in the groove in the preceding nut screw outside.

3, built-in bolt as claimed in claim 1 is characterized in that the other end of said ratchet is located in the cavity in the preceding nut screw outside, and ratchet can rotate around jack shaft, and cavity is to preceding nut peripheral hardware penetration hole.

4, built-in bolt as claimed in claim 1 is characterized in that the bore of the ratchet bore partly of the preceding bar portion of said screw greater than the helical thread portion of back bar portion; Before the bore of nut and thickness respectively greater than the bore and the thickness of back nut.