CN205315438U - Scrape lacquer screw - Google Patents

Abstract

The utility model relates to a paint-scraping screw, which comprises a screw body. The screw body has a cap head and a threaded part. The tail of the threaded part has a blade and a chip removal groove. A straight-through groove inclined at a certain angle to the axis of the screw body and consistent with the screwing direction of the threaded part, the surface of the straight-through groove has an external thread adapted to the external thread of the threaded part. The utility model has a straight-through groove inclined at a certain angle relative to the axis of the screw body in the length direction of the threaded part and consistent with the tightening direction of the threaded part, so that the screw has better paint scraping and chip removal functions. The screw is screwed into the internal thread Finally, the screw has better paint scraping and chip removal functions, and can more effectively scrape off the paint film coating on the surface of the inner thread of the nut, so that the metal contact surface between the screw and the inner thread of the nut is enlarged, and the conductive effect is better .

Description

A paint-scraping screw

technical field

The utility model belongs to the technical field of fasteners, in particular to a paint-scraping screw.

Background technique

The paint-scraping screw is a fastener used for the assembly of auto parts. At the grounding place of the ground wire of the automotive electrical appliance, due to the existence of the paint film in the nut, the electrical appliance and the electrical circuit are not well grounded, which affects the operation of the electrical system. Therefore, when using ordinary screws, it is necessary to scrape off the paint plugged in the nut thread with a tap or special tool before screwing in, and then assemble, which is labor-intensive and time-consuming, and is not suitable for mass production of automobiles. Although there are some paint-scraping bolts in the current market, only part of the paint coating can be scraped off when screwing into the internal thread due to the design of the blade and chip removal groove at the tail end, and the electrical conductivity is not optimal.

Utility model content

The purpose of this utility model is to solve the above technical problems and provide a paint-scraping screw. After being screwed into the internal thread of the nut, the paint film in the nut can be scraped off and discharged, so that the screw is in metal contact with the internal thread of the nut. The larger the surface, the better the conductive effect.

In order to achieve the above object, the utility model adopts the following technical solutions:

A paint-scraping screw, including a screw body, the screw body has a cap head and a threaded part, and there is a non-threaded polished rod part between the cap head and the threaded part for installing a gasket assembly. The tail of the threaded part has a knife edge and a chip removal groove. The length direction of the threaded part has a straight-through groove inclined at a certain angle relative to the axis of the screw body and consistent with the tightening direction of the threaded part. The surface of the straight-through groove has a The external thread of the threaded portion is compatible with the external thread.

There are four through grooves, which are evenly distributed clockwise on the threaded portion.

The inclination angle of the through groove is 5 degrees.

The gasket assembly includes a flat washer and a spring washer, and the spring washer is located between the flat washer and the cap head.

In the utility model, there is a straight-through groove inclined at a certain angle relative to the axis of the screw body in the length direction of the threaded part and consistent with the tightening direction of the threaded part. The external thread of the screw makes the screw have better paint scraping and chip removal functions. After being screwed into the nut, the inclined straight-through groove on the thread part is used to make the paint scraping effect of the screw better and scrape off more effectively. The paint film coating on the surface of the inner thread of the nut increases the metal contact surface between the screw and the inner thread of the nut, and the conductive effect is better.

Description of drawings

Fig. 1 is the schematic diagram of the front view of the paint-scraping screw provided by the embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view along line A-A of Fig. 1 .

detailed description

Below, the substantive features and advantages of the utility model are further described in conjunction with examples, but the utility model is not limited to the listed embodiments.

As shown in Figure 1-2, a paint-scraping screw includes a screw body, the screw body has a cap head 1 and a threaded part 2, and there is a section between the cap head and the threaded part for installing a pad The non-thread polished rod part 3 of the chip assembly, the tail part of the thread part has a knife edge and chip removal groove 6, and the length direction of the thread part 2 has a certain angle with respect to the axis of the screw body and is consistent with the tightening direction of the thread part. A through groove 7 , the surface of the through groove 7 has an external thread adapted to the external thread of the threaded part 2 .

Further, there are four straight-through grooves, and the inclination angles and directions are uniformly distributed clockwise on the threaded part, as shown in Figure 2, thereby forming steps with a certain inclination on the surface of the threaded part surface structure.

It should be noted that the number of the through grooves 7 can also be more than 4 or less than 4, and can be designed according to the size of the screw and the width of the through grooves, such as the number of through grooves When the number is small, its width can be increased, and when the number is large, its width can be reduced.

It should be noted that the straight-through groove 7 runs straight from the tail of the threaded part to the other end—the head end, and runs through the entire threaded structure surface of the threaded part, and the corner of the bottom of the through-through groove 7 and the side wall meet It is a concave arc-shaped transition structure, and the upper part of the side wall of the straight-through groove is connected with the screw thread through the arc-shaped transition structure.

Preferably, the inclination angle of the through groove relative to the screw body is 5 degrees. Certainly, this inclination angle can be adjusted appropriately according to needs, and can be increased or decreased, and the details are not limited.

In the utility model, by adding the straight-through groove 7 which is evenly arranged clockwise and is consistent with the screwing direction of the thread part on the thread part, the screw has better paint scraping and chip removal functions. After the screw is screwed into the internal thread, use The straight-through groove on the thread part is inclined at a certain angle and set clockwise, which makes the paint scraping effect of the screw better, and can scrape off the paint film coating on the inner thread surface of the nut more effectively, so that the metal contact surface between the screw and the inner thread of the nut Larger, better conduction effect.

In addition, since the bottom surface of the clockwise straight-through groove 7 has a corresponding thread structure slightly lower than the external thread of the threaded part, it can also cooperate with the nut without causing the problem of weak connection with the nut.

Wherein, the gasket assembly includes a flat washer 5 and a spring washer 4 , and the spring washer 4 is located between the flat washer 5 and the cap head 1 .

It can be seen that the utility model has a straight-through groove inclined at a certain angle relative to the axis of the screw body in the length direction of the threaded part and consistent with the tightening direction of the threaded part. The external thread that is compatible with the external thread makes the screw have better paint scraping and chip removal functions. After the screw is screwed into the internal thread, the straight-through groove on the thread part that is inclined at a certain angle and set clockwise makes the screw paint scraping effect Better, it can more effectively scrape off the paint film coating on the surface of the inner thread of the nut, so that the metal contact surface between the screw and the inner thread of the nut is enlarged, and the conductive effect is better.

The above is only a preferred embodiment of the utility model, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the utility model, some improvements and modifications can also be made. Retouching should also be regarded as the scope of protection of the present utility model.

Claims (4)

1. scrape paint screw for one kind, including screw, this is stopped, described screw body has cap head portion and threaded portion, there is between described cap head portion and threaded portion one section of non-threaded polished rod portion for installing a shim pack component, the afterbody of described threaded portion has blade and chip area, it is characterized in that, having on the length direction of described threaded portion and tilt certain angle the conduction through concave trough consistent with screwed tight direction relative to screw body axis, the surface of described conduction through concave trough has the external screw thread that the external screw thread with described threaded portion adapts.

2. scrape paint screw according to claim 1, it is characterised in that described conduction through concave trough is four, be uniformly laid on described threaded portion clockwise.

3. according to claim 1 or claim 2 scrape paint screw, it is characterised in that the angle of inclination of described conduction through concave trough is 5 degree.

4. scrape paint screw according to claim 1, it is characterised in that described shim pack component includes plain cushion and spring washer, and described spring washer is between described plain cushion and cap head portion.