CN211343672U

CN211343672U - Keyway type anti-back screw

Info

Publication number: CN211343672U
Application number: CN201922076089.0U
Authority: CN
Inventors: 黄国柱
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-27
Filing date: 2019-11-27
Publication date: 2020-08-25
Anticipated expiration: 2029-11-27

Abstract

The utility model relates to the technical field of fasteners, in particular to a keyway type anti-back screw; it includes the screw and overlaps first nut, the second nut on the screw, its characterized in that: one side of the screw is provided with a key groove, a wedge is detachably embedded in the key groove, the side view of the wedge is L-shaped, the long branch of the wedge is embedded in the key groove, and the short branch of the wedge protrudes out of the screw; the structure is simple, and the key components only comprise a screw, two nuts and a wedge, so the manufacturing cost is low, and the wide use is facilitated; the anti-backing effect is good, the first nut is prevented from loosening and backing through the wedge, the wedge is locked through the second nut, and the fastening effect is good.

Description

Keyway type anti-back screw

Technical Field

The utility model belongs to the technical field of the fastener technique and specifically relates to the keyway formula is prevented moving back the screw.

Background

The anti-back screw is widely applied to the fields of buildings, traffic, machinery and the like as a fastener.

At present, there are various anti-back screws, for example, chinese patent discloses an anti-back screw without loosening, patent No. 01228064X, in which: the anti-slip bolt comprises a bolt, an anti-slip sheet and a nut, wherein the anti-slip sheet and the nut are sleeved on the bolt, a groove is formed in a threaded part of the bolt, a protrusion is arranged on the anti-slip sheet, the protrusion can move back and forth in the groove in the bolt, one end of the nut is provided with a brim, a double-sided patch is further arranged between the anti-slip sheet and the nut, and the anti-slip sheet and the nut can be adhered together through the double-sided patch.

The technical scheme has the following defects that: the anti-return sheet can move along the groove, so that the anti-return sheet is also easily pushed to move when the nut is loosened due to impact, and although the anti-return sheet has a certain friction effect on the rotation of the nut, the anti-return sheet is easy to move back and forth, so that the anti-return sheet is not suitable for being applied to occasions with large vibration, such as mechanical equipment and vehicles.

Disclosure of Invention

The utility model provides a not enough to prior art, the utility model provides a screw is prevented moving back by keyway formula, this screw application is in multiple occasion all difficult not hard up to appear.

The technical scheme of the utility model is that:

keyway formula is prevented moving back the screw, it includes the screw and overlaps first nut, the second nut on the screw, its characterized in that: one side of the screw is provided with a key groove, a wedge is detachably embedded in the key groove, the side view of the wedge is L-shaped, a long branch of the wedge is embedded in the key groove, and a short branch of the wedge protrudes out of the screw.

Further, the first nut is positioned inside the short branch of the wedge, and the second nut is positioned outside the short branch of the wedge, so that the two nuts cannot contact each other.

Furthermore, a plurality of gaskets are sleeved on the screw.

The utility model discloses a theory of operation:

a groove (namely a key groove) is milled on the screw, and the first nut is propped against the key (namely the wedge) on the groove, so that the first nut is prevented from loosening and retreating, and the key is locked by the second nut, so that the first nut is not easy to loosen even under the vibration condition, and finally, the first nut is not easy to influence the second nut after being stressed and is not loosened due to the fact that the first nut is not directly contacted with the second nut.

The utility model has the advantages that: the structure is simple, and the key components only comprise a screw, two nuts and a wedge, so the manufacturing cost is low, and the wide use is facilitated; the anti-backing effect is good, the first nut is prevented from loosening and backing through the wedge, the wedge is locked through the second nut, and the fastening effect is good.

Drawings

Fig. 1 is a schematic structural view of the present invention;

figure 2 is a schematic view of the assembly of the wedge.

In the drawings, 1, screw; 2. a first nut; 3. a second nut; 4. a keyway; 5. a wedge; 6. and (7) a gasket.

Detailed Description

The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:

as shown in fig. 1-2, the keyway type anti-back screw comprises a screw 1, a first nut 2 and a second nut 3 which are sleeved on the screw 1, wherein one side of the screw 1 is provided with a keyway 4, a wedge 5 is detachably embedded in the keyway 4, the wedge 5 is L-shaped in side view, the long branch of the wedge is embedded in the keyway 4, and the short branch of the wedge protrudes out of the screw 1.

The first nut 2 is located inside the short limb of the wedge 4 (in fig. 1, the first nut 2 is located to the left of the short limb of the wedge 4), and the second nut 3 is located outside the short limb of the wedge 4 (in fig. 1, the second nut 3 is located to the right of the short limb of the wedge 4), so that the two nuts cannot contact each other.

The screw 1 is also sleeved with a plurality of gaskets 6.

When the wedge needs to be fixed, the gasket and the first nut are sleeved on the screw, the long branch of the wedge is embedded into the key groove, the second nut is sleeved on the wedge, and the second nut is rotated to abut against the short branch of the wedge, as shown in fig. 2.

Based on the above description, the using method of the present invention (taking the example of connecting two steel plates with through holes as an example):

1) penetrating a screw through the through holes of the two steel plates;

2) then, sleeving the gasket and the first nut once, and locking the gasket through the first nut to enable the gasket to be tightly attached to the steel plate;

3) then the wedge is inserted into the keyway (at this point if the plate is too thick, it is possible that the first nut will occupy a certain position in the keyway, but use will not be affected), and the second nut is tightened against the wedge.

The foregoing embodiments and description have been provided to illustrate the principles and preferred embodiments of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed.

Claims

1. Keyway formula is prevented moving back the screw, it includes the screw and overlaps first nut, the second nut on the screw, its characterized in that: one side of the screw is provided with a key groove, a wedge is detachably embedded in the key groove, the side view of the wedge is L-shaped, a long branch of the wedge is embedded in the key groove, and a short branch of the wedge protrudes out of the screw.

2. The keyway anti-back screw of claim 1, wherein: the first nut is positioned in the short branch of the wedge, and the second nut is positioned outside the short branch of the wedge.

3. The keyway anti-back screw of claim 2, wherein: the screw is also sleeved with a plurality of gaskets.