CN216714955U

CN216714955U - Tail cutting screw

Info

Publication number: CN216714955U
Application number: CN202123141609.5U
Authority: CN
Inventors: 黄鲲木
Original assignee: Baoxun Precision Screw Zhejiang Co ltd
Current assignee: Baoxun Precision Screw Zhejiang Co ltd
Priority date: 2021-12-14
Filing date: 2021-12-14
Publication date: 2022-06-10
Anticipated expiration: 2031-12-14

Abstract

The utility model discloses a tail cutting screw, which relates to the technical field of screws and comprises a screw head and a cylinder body, wherein the outer side wall of the cylinder body is provided with a thread groove, the thread groove comprises an upper part and a lower part, the thread pitch of the upper part is different from that of the lower part, the lower end of the outer side wall of the cylinder body is provided with a first groove, two ends of the inner wall of one side of the first groove are provided with second grooves, and the second grooves are directly communicated with the outside. According to the utility model, the thread groove is formed in the outer side wall of the column body and comprises the upper part and the lower part, and the thread pitch of the upper part is different from that of the lower part, so that after the device is completely screwed into the thread hole, the upper part can increase the friction force applied to the device, and the device is prevented from loosening.

Description

Tail cutting screw

Technical Field

The utility model relates to the technical field of screws, in particular to a tail cutting screw.

Background

The screw is a tool for fastening the parts of the object step by utilizing the physics and mathematical principles of the inclined circular rotation and friction of the object. The tail cutting screw is a self-tapping self-cutting screw, and its main feature is that its tail end has cutting groove or open-end receiving groove, so that when it is screwed into the prefabricated hole, it can cut internal thread matched with it, and the chip can not be fallen into the body.

However, in the existing tail cutting screw, when in use, the screw and the thread groove are easy to loosen and separate due to insufficient friction force, and the fastening effect is further influenced. Therefore, it is necessary to provide a tail cutting screw to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to a tail cutting screw, which solves the above problems of the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a tail cutting screw, includes screwhead and cylinder, the lateral wall of cylinder is provided with the thread groove, the thread groove includes upper portion and lower part, and the pitch on upper portion is different with the pitch of lower part, first recess has been seted up to the lateral wall lower extreme of cylinder, the second recess has all been seted up at the both ends of first recess one side inner wall, and the second recess is direct and external intercommunication.

Preferably, the lower end of the column body is fixedly connected with an open end which is arranged in a resulting conical shape.

Preferably, the outer side wall of the tapping end is fixedly connected with a plurality of reamer blades distributed in an annular array, and the upper surface of the screw head is provided with a cross groove.

Preferably, the screw head is arranged to be a truncated cone, and the outer side wall of the screw head is provided with friction lines.

The utility model has the technical effects and advantages that:

1. according to the utility model, the thread groove is formed in the outer side wall of the column body, the thread groove comprises the upper part and the lower part, and the thread pitch of the upper part is different from that of the lower part, so that after the device is completely screwed into the thread hole, the upper part can increase the friction force applied to the device, and the device is prevented from loosening;

2. according to the utility model, the second grooves are formed in the two ends of the inner wall of one side of the first groove, and the open ends of the second grooves are directly communicated with the outside, so that when the device is loosened, the scraps in the inner cavity of the first groove can move to the inner cavity of the second groove under the friction force of the inner wall of the threaded hole, but the scraps can fill the inner cavity of the second groove due to the small size of the second groove, so that the scraps in the inner cavity of the second groove can be greatly extruded with the inner wall of the threaded hole, the friction force applied to the device is further increased, and the possibility of loosening of the device is reduced.

Drawings

Fig. 1 is a schematic front view of the overall structure of the present invention.

Fig. 2 is a perspective view of the overall structure of the present invention.

Fig. 3 is a perspective view of another embodiment of the present invention.

In the figure: 1. a screw head; 2. a cylinder; 3. a thread groove; 4. an upper portion; 5. a lower portion; 6. a first groove; 7. a second groove; 8. opening the hole end; 9. a hole expanding cutter; 10. a cross groove; 11. and (5) rubbing the lines.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example one

The utility model provides a tail cutting screw as shown in figures 1-3, which comprises a screw head 1 and a cylinder 2, wherein the outer side wall of the cylinder 2 is provided with a thread groove 3, the thread groove 3 comprises an upper part 4 and a lower part 5, and the thread pitch of the upper part 4 is smaller than that of the lower part 5, so that after the device is screwed into a threaded hole, the friction force between the upper part 4 and the threaded hole can be increased because the thread pitch of the upper part 4 is smaller than that of the lower part 5, thereby effectively preventing the device from being separated from the threaded hole, and the integral height of the upper part 4 is smaller, so that the self-tapping process of the device can not be hindered.

Secondly, a first groove 6 is formed in the lower end of the outer side wall of the cylinder 2, second grooves 7 are formed in two ends of the inner wall of one side of the first groove 6, and the second grooves 7 are directly communicated with the outside; and when this device reverse unscrewed, the bits end in the first recess 6 removes the inner chamber to second recess 7 under the frictional force effect, nevertheless because the length of two second recesses 7 all is less than the length of first recess 6, consequently can be full of second recess 7 inner chamber filling after the bits end gets into second recess 7 inner chamber, frictional force between this moment bits end and the threaded hole inner wall can increase, and then causes the hindrance to unscrewing of this device to effectively avoid this device to take place to become flexible.

Further, at the lower extreme fixedly connected with trompil end 8 of cylinder 2, trompil end 8 sets up to the conical shape that leads to, and a plurality of ring array distribution's of being reamer 9 of lateral wall fixedly connected with of trompil end 8, and trompil end 8 and reamer 9 set up this device of mainly used and carry out the trompil to the object.

And, set up cross recess 10 on the upper surface of screwhead 1, the setting of cross recess 10 is used for screwing to this device, and screwhead 1 sets up the round platform type that leads to, and friction line 11 has been seted up to the lateral wall of screwhead 1, and after this device was screwed completely in the screwed hole, friction line 11's setting is used for increasing the frictional force between screwhead 1 lateral wall and the object, further avoids this device to become flexible.

Example two

As shown in figure 3, the pitch of upper portion 4 can also be greater than the pitch of lower part 5, can satisfy equally when this device twists threaded hole back, frictional force between upper portion 4 and the screw hole can increase to effectively prevent this device and screw hole separation, the pitch of upper portion 4 only needs to keep different with the pitch of lower part 5 promptly, can ensure that this device is difficult for taking place not hard up after screwing up.

The working principle of the utility model is as follows:

when the device is used, the hole opening end 8 of the device is inserted into a prefabricated hole or is propped against the surface of an object, then the device is screwed in the screwing direction, and the hole expanding cutter 9 on the outer side wall of the hole opening end 8 can expand the prefabricated hole or directly open the surface of the object;

then the lower part 5 carries out self tapping on the hole formed by the device and forms an internal thread until the device is completely inserted into the threaded hole, and the upper part 4 can effectively increase the friction force applied to the device after the device is inserted into the threaded hole due to the fact that the thread pitch of the upper part 4 is different from that of the lower part 5, and therefore the device is effectively prevented from loosening;

moreover, in the process of self-tapping the internal thread of the device, the generated scraps can fall into the inner cavity of the first groove 6, so that the phenomenon that the scraps block the device due to screwing is avoided.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments, or make equivalent substitutions and improvements to part of the technical features of the foregoing embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A tail cutting screw comprises a screw head (1) and a cylinder (2), and is characterized in that: the lateral wall of cylinder (2) is provided with thread groove (3), thread groove (3) include upper portion (4) and lower part (5), and the pitch of upper portion (4) is different with the pitch of lower part (5), first recess (6) have been seted up to the lateral wall lower extreme of cylinder (2), second recess (7) have all been seted up at the both ends of first recess (6) one side inner wall, and second recess (7) are direct and external intercommunication.

2. A screw of claim 1, wherein: the lower extreme fixedly connected with trompil end (8) of cylinder (2), trompil end (8) set up to the conical shape that leads to.

3. A screw of claim 2, wherein: the outer side wall of the open end (8) is fixedly connected with a plurality of expanding cutters (9) distributed in an annular array, and a cross groove (10) is formed in the upper surface of the screw head (1).

4. A screw of claim 3, wherein: the screw head (1) is arranged to be in a truncated cone shape, and the outer side wall of the screw head (1) is provided with friction grains (11).