CN221503711U - Self-tapping screw - Google Patents

Abstract

The utility model relates to the technical field of screws, in particular to a self-tapping screw, which comprises a screw cap, a screw rod, screw teeth and a spring plate mechanism, wherein the spring plate mechanism comprises a guide groove and a spring plate, the guide groove is arranged in the screw cap, the guide groove comprises a feed inlet, a discharge outlet and a transition section communicated with the feed inlet and the discharge outlet, the feed inlet and the discharge outlet are both arranged on the contact surface of the screw cap and an external mounting surface, the spring plate is arranged in the guide groove in a sliding manner, two ends of the spring plate extend out of the feed inlet and the discharge outlet respectively, the end part of the spring plate is deformed after being contacted with the external mounting surface and presses the external mounting surface, and finally the spring plate is arranged between the external mounting surface and the screw cap in a cushioning manner, so that the technical problem that flanging burrs produced in the prior art are easy to extend out of the screw cap to affect safety and attractive appearance is solved.

Description

Self-tapping screw

Technical Field

The utility model relates to the technical field of screws, in particular to a self-tapping screw.

Background

Self-tapping screws are a type of mechanical part, in particular cylindrical threaded fasteners, consisting of a head and a screw, and are often used for the connection between thin metal plates (steel plates, saw plates, etc.).

But tapping screw easily produces the turn-ups burr when using, and partial turn-ups burr can stretch out the cover face of nut, influences aesthetic property to the turn-ups burr that stretches out easily takes place to cut to hinder, influences the security.

Disclosure of utility model

According to the self-tapping screw, the plurality of groups of guide grooves are formed in the circumferential array of the screw cap, the elastic pieces are arranged in the guide grooves in a sliding mode, the two ends of the elastic pieces extend out of the feed inlet and the discharge outlet respectively, when the screw rod is screwed in, deformation is generated when the two ends of the elastic pieces are in contact with the external contact surface, the elastic pieces coming out of the discharge outlet press down flanging burrs generated in the screwing process, and finally the elastic piece deformation pad is arranged between the screw cap and the external contact surface, so that the technical problem that the safety and the attractiveness are affected because the flanging burrs generated in the prior art are easy to extend out of the covering surface of the screw cap is solved.

In order to achieve the above purpose, the present utility model provides the following technical solutions:

The utility model provides a self-tapping screw, includes nut, screw rod, thread and shell fragment mechanism, shell fragment mechanism includes guide way and shell fragment, the guide way sets up in the nut, the guide way includes feed inlet, discharge gate and intercommunication the feed inlet with the changeover portion of discharge gate, the feed inlet with the discharge gate is all seted up on the contact surface of nut and external installation face, the shell fragment slides and sets up in the guide way and its both ends stretch out respectively the feed inlet with the discharge gate sets up, shell fragment tip and external installation face are contacted the back and are produced deformation and are pressed down external installation face, finally the shell fragment pad is established outside installation face with between the nut.

As an improvement, the nut is provided with a taper shape with a large upper part and a small lower part.

As an improvement, the top end of the nut is provided with a cross groove.

As an improvement, a plurality of groups of elastic sheet mechanisms are circumferentially arranged on the screw cap in an array.

As a modification, the transition section is arranged in a J shape.

As an improvement, the feeding direction of the feeding hole is arranged along the length direction of the screw rod.

As an improvement, the discharge direction of the discharge port is set toward the screw shaft.

As an improvement, the elastic sheet is arranged in the guide groove in a transition fit manner.

The utility model has the beneficial effects that:

(1) When the screw rod is screwed in, one end of the elastic piece at the feed port side is abutted against the external contact surface, the elastic piece at the discharge port side extends out and moves towards the screw rod to contact with the external contact surface, so that the generated flanging burrs are inwards, the flanging burrs cannot extend out of the covering surface of the nut, the attractiveness is ensured, and the safety is improved;

(2) According to the utility model, the elastic sheet can be abutted against the external contact surface, and finally the elastic sheet is arranged between the nut and the external contact surface in a pad manner when the nut is screwed down, so that the gasket is realized, and the loosening phenomenon of the screw can be prevented;

(3) According to the utility model, the elastic sheets are correspondingly arranged in the guide grooves, and then the elastic sheets are circumferentially distributed between the nuts and the external contact surface, so that the stability of screw fixation can be further improved.

In conclusion, the utility model has the advantages of simple structure, convenient use, safe use and the like, and is particularly suitable for the technical field of screws.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

FIG. 2 is a cross-sectional block diagram of the present utility model;

FIG. 3 is a state diagram I of the present utility model;

Fig. 4 is a second state diagram of the present utility model.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Examples:

As shown in fig. 1 and 2, a self-tapping screw comprises a screw cap 1, a screw rod 2, a screw tooth 3 and a spring plate mechanism 4, wherein the spring plate mechanism 4 comprises a guide groove 41 and a spring plate 42, the guide groove 41 is arranged in the screw cap 1, the guide groove 41 comprises a feed inlet 411, a discharge outlet 412 and a transition section 413 communicated with the feed inlet 411 and the discharge outlet 412, the feed inlet 411 and the discharge outlet 412 are both arranged on the contact surface between the screw cap 1 and an external mounting surface, the spring plate 42 is slidably arranged in the guide groove 41, two ends of the spring plate 42 respectively extend out of the feed inlet 411 and the discharge outlet 412, the end part of the spring plate 42 is deformed after being contacted with the external mounting surface and presses the external mounting surface, and finally the spring plate 42 is arranged between the external mounting surface and the screw cap 1 in a pad mode.

Further, the nut 1 is provided with a taper shape with a large upper part and a small lower part.

Further, a cross groove 11 is formed in the top end of the nut 1.

Further, a plurality of groups of elastic sheet mechanisms 4 are circumferentially arranged on the nut 1 in an array.

Further, the transition section 413 is configured in a "J" shape.

Further, the feeding direction of the feeding hole 411 is set along the length direction of the screw shaft 2.

Further, the discharging direction of the discharging hole 412 is set toward the screw shaft 2.

It should be noted that the inlet 411 and the outlet 412 are both formed on the tapered surface of the nut 1, and the inlet 411 is located below the outlet 412.

It should be further noted that, as shown in fig. 3 and fig. 4, when the screw rod 2 is screwed in, the end of the elastic piece on the side of the feed port 411 is first contacted with the external contact surface 5, and the side of the discharge port 412 extends toward the screw rod 2, so that the turned-up burr generated in the screwing process is moved inward when the elastic piece 42 moved out of the discharge port 412 contacts with the external contact surface, and the turned-up burr does not extend out of the coverage area of the nut 1.

It is important to explain that, after the screw rod 2 is screwed completely, the shell fragment 42 can deform and fill up and establish between the nut 1 with outside contact surface 5 plays the effect of gasket, cooperates the array distribution of a plurality of groups shell fragment 42, and then has improved the fixed firmness of screw rod 2, plays locking effect.

Further, the elastic piece 42 is disposed in the guide groove 41 in a transition fit manner.

The working process comprises the following steps:

As shown in fig. 3 and fig. 4, when the screw rod 2 is screwed in, the end of the elastic piece on the side of the feed inlet 411 is contacted with the external contact surface 5, and the side of the discharge outlet 412 extends towards the screw rod 2, so that the elastic piece 42 moved out of the discharge outlet 412 contacts with the external contact surface to move the flanging burr generated in the screwing process inwards, and the flanging burr and the elastic piece 42 are completely pressed below by the nut 1.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the utility model.

Claims (8)

1. The utility model provides a self-tapping screw, its characterized in that includes nut (1), screw pole (2), thread (3) and shell fragment mechanism (4), shell fragment mechanism (4) are including guide way (41) and shell fragment (42), guide way (41) set up in nut (1), guide way (41) are including feed inlet (411), discharge gate (412) and intercommunication feed inlet (411) with changeover portion (413) of discharge gate (412), feed inlet (411) with discharge gate (412) all are seted up on the contact surface of nut (1) and outside installation face, shell fragment (42) slip sets up in guide way (41) and its both ends stretch out respectively feed inlet (411) with discharge gate (412) set up, shell fragment (42) tip and outside installation face are pressed to the outside installation face after contact deformation, finally shell fragment (42) pad is established outside installation face with between nut (1).

2. A tapping screw as in claim 1, wherein the nut (1) is provided in a conical shape with a large top and a small bottom.

3. A tapping screw as claimed in claim 1, characterized in that the top end of the screw cap (1) is provided with a cross-shaped recess (11).

4. A tapping screw as in claim 1, wherein a plurality of sets of said spring means (4) are circumferentially arranged on said nut (1).

5. A tapping screw as claimed in claim 1, wherein the transition section (413) is arranged in a "J" shape.

6. A tapping screw as claimed in claim 1, characterized in that the feed direction of the feed opening (411) is arranged along the length of the screw shaft (2).

7. A tapping screw as claimed in claim 1, characterized in that the tapping direction of the tapping orifice (412) is arranged towards the screw shaft (2).

8. A tapping screw as claimed in claim 1, wherein the spring plate (42) is provided in the guide groove (41) in a transition fit.