CN2541656Y - Check screw fastener - Google Patents

Abstract

The utility model discloses a loose-proof screw thread fastener, wherein resin layers are separately disposed on the surface of an inner screw thread and an outer screw thread of the screw thread fastener, or only the surface of the inner screw thread and the outer screw thread is provided with resin layer. When a screw bolt is screwed on the surface of the inner screw thread of a screw nut, the resin layers are crushed into fractures and are filled in the gap between the inner screw thread and the outer screw thread, thereby the friction force is increased, and the purpose of loose-proofing and fastening is achieved. Compared with the commonly used loose-proof method that a nylon ring is sheathed on the outer screw thread, the utility model has the advantages of good loose-proof effect, easy processing and assembling, and low cost.

Description

The checknut fastening piece

Technical field

The utility model relates to a kind of fastening coupling, refers to a kind of checknut fastening piece especially.

Background technique

The locking of screw thread is the constantly problems of research of people always.Normally used anti-loose method is to adopt double nut or spring washer, yet the anti-loosing effect of this method is not good, and is difficult to it is used in the small-sized threaded fastener (as the threaded fastener of spectacle frame).

At the problems referred to above, a kind of locking mode that adds nylon ring on the outside thread of bolt has appearred, this mode has been overlapped nylon ring owing to adding on outside thread, when it is screwed into internal thread, nylon ring produces resiliently deformable, be compressed between the internal and external threads, form interference fit, thereby reach locking purpose.Yet, though the anti-loosing effect of this mode is fine, when processing and assembling, nylon ring being inserted in comparatively difficulty of outside thread, efficiency of assembling is low, for small-sized bolt, will use Special Equipment usually, and processing cost is very high.

The model utility content

The purpose of this utility model is to provide a kind of efficiency of assembling height, and processing cost is low, and the good checknut fastening piece of anti-loosing effect.

For achieving the above object, the utility model provides a kind of checknut fastening piece, wherein: in thread surface resin layer is arranged.

Described checknut fastening piece, wherein: this resin layer is on the surface of outside thread or internal thread.

Tiny particle is arranged in the resin layer of described checknut fastening piece, and the resin of resin layer is the acrylic acid resin.

After adopting such scheme, because the utility model has resin layer in the thread surface of bolt, after outside thread is screwed into internal thread, the resin layer of thread surface is cracked through pushing, be filled in the gap of internal and external threads, thus the frictional force between the increase screw thread, to reach fastening locking purpose, and it is much higher to add cover nylon ring efficient than on outside thread at thread surface spraying resin layer, has therefore reduced cost greatly; In addition, the utility model can only spray resin layer according to actual needs on outside thread or interior threaded surface, use very convenient.

Description of drawings

Fig. 1 is the sectional view (not being screwed into) of the utility model screw bolt and nut;

Fig. 2 is the cross-sectional schematic after the utility model bolt is screwed into nut;

Fig. 3 is the partial enlarged drawing of Fig. 2;

Fig. 4 is the user mode figure that another embodiment's internal and external threads of the utility model cooperates.

Embodiment

As shown in Figure 1, checknut fastening piece of the present utility model comprises bolt 1 and nut 2, and outside thread 11 surfaces of bolt 1 and internal thread 21 surfaces of nut 2 are coated with one deck resin layer 3 respectively, and this resin layer 3 is after extruding, cracked easily, resin layer 3 is generally the acrylic acid resin.

(cooperate Fig. 2 and shown in Figure 3) when in the internal thread 21 that bolt 1 is screwed into nut 2 with its outside thread 11, because the acrylic acid resin layer 3 of thread surface is cracked after pushing, gap between the internal and external threads is fully filled up, increase the frictional force between internal and external threads, thereby reached fastening locking purpose.

In addition, the utility model can only on outside thread 11 surfaces of bolt 1, or only (for example: when internal thread directly is formed on the body spray resin layers 3 on internal thread 21 surfaces of nut 2 according to actual needs, can't be when its surface spraying resin layer), practical application is very convenient.

Again as shown in Figure 4, be another more effective locking embodiment of the utility model, in the resin layer 3 of screw thread, add tiny particle 4, when outside thread is screwed into internal thread, particle 4 is filled between the internal and external threads along with the cracked of resin layer 3, thereby can further increase the frictional force between the internal and external threads.

Claims (5)

1, a kind of checknut fastening piece is characterized in that: in thread surface resin layer is arranged.

2, checknut fastening piece as claimed in claim 1, it is characterized in that: this resin layer is on external threaded surface.

3, checknut fastening piece as claimed in claim 1, it is characterized in that: this resin layer is on interior threaded surface.

4, checknut fastening piece as claimed in claim 1 is characterized in that: tiny particle is arranged in this resin layer.

5, checknut fastening piece as claimed in claim 1 is characterized in that: the resin of this resin layer is the acrylic acid resin.

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