CN110886758A

CN110886758A - Screw with low twist locking torque

Info

Publication number: CN110886758A
Application number: CN201811050211.0A
Authority: CN
Inventors: 苏国材; 苏振荣
Original assignee: Qingda Technology Co Ltd
Current assignee: Qingda Technology Co Ltd; Taiwan Shan Yin International Co Ltd
Priority date: 2018-09-10
Filing date: 2018-09-10
Publication date: 2020-03-17
Anticipated expiration: 2038-09-10
Also published as: CN110886758B

Abstract

The invention provides a screw with low twist lock torsion, which is mainly characterized in that a plurality of cutting threads are arranged on a rod body, each cutting thread is provided with a plurality of cutting grooves, so that a first cutting edge and a second cutting edge are formed, and a groove is concavely arranged at the joint of the first cutting edge and the second cutting edge so as to form two crests.

Description

Screw with low twist locking torque

Technical Field

The present invention relates to a locking member, and more particularly to a screw with low torque.

Background

Referring to fig. 1, a conventional screw 1 includes a rod 11, a screw head 12 disposed at one end of the rod 11, a locking portion 13 disposed at the other end of the rod 11 opposite to the screw head 12, and a plurality of screw threads 14 disposed on the rod 11 and extending toward the locking portion 13; wherein the locking portion 13 is tapered to form a drill tip 131; when in use, the drill tip 131 is pressed against the surface of a locking member (not shown), a rotating torque is applied to the screw head 12 to drill a hole on the locking member by gradually pressing the drill tip 131, and after the locking portion 13 is gradually screwed into the locking member, the screw teeth 14 are connected with the locking portion 13 to cut the locking member, so as to drive the rod body 11 to enter the locking member along with the cutting of the screw teeth 14, thereby completing the locking operation of the screw 1.

However, after practical use, it is found that when the screw 1 is locked on the locking object, the screw 1 can only enter the locking object by the drill tip 131 in an extruding manner at the initial locking stage until the locking portion 13 enters the locking object, the threads 14 can not continue to the locking portion 13 for cutting the locking object, however, the threads 14 cannot effectively destroy the fibers of the locking object, so that the fibers are easily wound on the screw 1, which further results in an increase in the screwing torque force, and the chips generated by the subsequent locking are more likely to be obstructed by the accumulated fibers and cannot be discharged outward in time, so that the screw 1 cannot be screwed inward, which further increases the difficulty of locking, and at this time, if the screw 1 continues to drill down the locking object, it is more likely to cause the situation that the screw 1 is damaged, passivated or broken, or the situation that the locking object is broken, moreover, the screw 1 cannot be engaged with the locking element effectively, so that the screw 1 is easy to loosen, and when the screw 1 is pulled or vibrated by an external force, the screw 1 is easy to loosen, shake or fall off, so that the locking effect of the screw 1 is poor, and the improvement is needed.

Disclosure of Invention

Therefore, an object of the present invention is to provide a screw with low twist-lock torque, which can effectively chop the locked fibers, and is helpful to reduce the twist-lock torque and increase the cutting speed, and simultaneously, can rapidly discharge chips, and achieve better engagement stability after locking.

Therefore, the screw with low twist locking torque force comprises a rod body, a screw head and a locking part which are respectively arranged at two ends of the rod body, and a plurality of cutting screw teeth arranged on the rod body; each cutting screw tooth comprises an upper tooth surface and a lower tooth surface which respectively extend outwards from the rod body, and a plurality of cutting grooves and grooves which are formed at the joint of the upper tooth surface and the lower tooth surface, each cutting groove is provided with a first cutting edge, a second cutting edge connected with the first cutting edges, and a tooth bottom formed at the joint of the first cutting edge and the second cutting edge, and an upper tooth crest and a lower tooth crest are respectively formed at two ends of each groove; therefore, the first cutting edge and the second cutting edge can be matched with the upper crest and the lower crest to rapidly expand the hole at the initial stage of locking, simultaneously effectively chop the fibers of the locking compound to facilitate the entry of the screw by screw locking, not only effectively improve the cutting speed, meanwhile, the situation that the fiber is wound on the rod body is avoided, the torque force of the rotary locking is greatly reduced, in addition, the cutting chips generated during the locking process can be discharged outwards along the cutting threads, the quick chip removal is achieved, the situation that the cutting chips are excessively accumulated to cause the material cracking of the locking object is avoided, furthermore, the cutting grooves and the grooves can accommodate chips which cannot be discharged in time, and meanwhile, partial chips are accumulated at the cutting grooves and the grooves after being locked, so that the stable engagement between the screw and the locking object is promoted, the drawing force is effectively increased, and the engagement stability of screwing the screw is improved.

Drawings

Fig. 1 is a schematic view of a conventional screw.

Fig. 2 is a perspective view of the first preferred embodiment of the present invention.

Fig. 3 is an enlarged view at B in fig. 2.

Fig. 4 is another perspective view of the first preferred embodiment.

Fig. 5 is a schematic cross-sectional view taken along line S-S of fig. 2.

Fig. 6 is a schematic view of the locked state of the first preferred embodiment.

Fig. 7 is a perspective view of a second preferred embodiment of the present invention.

Fig. 8 is an enlarged view at C in fig. 7.

Fig. 9 is a schematic cross-sectional view taken along line S-S of fig. 7.

Description of the symbols:

(publicly known)

1 screw

11-rod body 12 screw head

13 screw thread of locking part 14

131 drill point

(present invention)

3 screw with low rotation locking torque

31 rod body 32 screw head

33 locked part 34 cutting screw thread

35 auxiliary screw thread

331 drill point

341 upper tooth surface 342 lower tooth surface

343 cutting groove 344 is slotted

3411 peaks of upper teeth

3421 lower crest

3431 first cutting edge 3432 second cutting edge

3433 root of tooth

Angle formed by the intersection of the A1 locking parts

Angle formed by upper tooth surface and base line of A2

Angle formed by A3 lower tooth surface and base line

Angle of inclination of a4 first cutting edge

Angle of inclination of a5 second cutting edge

34d outer diameter of cutting screw

Outer diameter of 35d auxiliary screw thread

R1 base line

R2 center line

4-Lock Compound

Detailed Description

These and other aspects, features and advantages of the present invention will become apparent from the following detailed description of preferred embodiments, which is to be read in connection with the accompanying drawings.

Referring to fig. 2, in a preferred embodiment of the present invention, the screw 3 with low torque comprises a rod 31, a head 32 disposed at one end of the rod 31, a locking portion 33 disposed at the other end of the rod 31 opposite to the head 32, and a plurality of cutting threads 34 disposed on the rod 31 and extending toward the locking portion 33; in the embodiment, the locking portion 33 is tapered to form a drill tip 331, and an angle a1 formed by the tapered intersection of the locking portion 33 and the drill tip 331 extending outward is preferably 22 to 26 degrees, in the embodiment, a plurality of auxiliary threads 35 are further disposed on the rod 31, and the auxiliary threads 35 are disposed in a complete thread form, the auxiliary threads 35 are preferably disposed adjacent to the screw head 32, and the cutting threads 34 are disposed in a wave form, as shown in fig. 4, and the cutting threads 34 are preferably disposed adjacent to the locking portion 33, and an outer diameter 34d of the cutting threads 34 is smaller than an outer diameter 35d of the auxiliary threads 35.

Referring to fig. 2 and 3, each cutting thread 34 includes an upper thread surface 341 extending downward from the rod 31, a lower thread surface 342 extending upward from the rod 31, a plurality of slots 343 formed at the junction of the upper thread surface 341 and the lower thread surface 342, and a plurality of slots 344 recessed at the junction of the upper thread surface 341 and the lower thread surface 342, and the center of the slot 344 extends horizontally outward to define a base line R1, in this embodiment, an inclination angle a2 formed by the intersection of the upper thread surface 341 extending outward and the base line R1 is different from an inclination angle A3 formed by the intersection of the lower thread surface 342 extending outward and the base line R1, the inclination angle a2 is preferably 10 degrees, and the inclination angle A3 is preferably 30 degrees.

Referring to fig. 3 and 4, each slot 343 has a first cutting edge 3431, a second cutting edge 3432 connected to the first cutting edge 3431, and a root 3433 formed at the connection between the first cutting edge 3431 and the second cutting edge 3432. referring to fig. 5, the intersection point where the first cutting edge 3431 extends outward and the second cutting edge 3432 extends outward defines a center line R2, and the inclination angle a4 formed by the intersection between the first cutting edge 3431 and the center line R2 is different from the inclination angle a5 formed by the intersection between the second cutting edge 3432 and the center line R2, the inclination angle a4 is preferably 60 degrees, the inclination angle a5 is preferably 30 degrees, and each slot 344 is formed at the connection between the upper tooth surface 341 and the lower tooth surface 342, so that the upper tooth peak 341 and the lower tooth peak 3421 are formed at the two ends of the slot 344, respectively.

Referring to fig. 2 to 6, during the locking operation, a user first presses the drill tip 331 against the surface of a locking member 4 and applies a rotational torque to the screw head 32 to make the drill tip 331 driven by the rotational torque to drill the locking member 4, and at this time, the first cutting edge 3431 and the second cutting edge 3432 are used to match the upper peaks 3411 and the lower peaks 3421 for rotary cutting, so as to not only effectively perform fast reaming on the locking member 4 to improve the overall cutting speed, but also perform multi-angle rotary cutting on the inside of the locking member 4 and effectively destroy the fibers of the locking member 4, thereby effectively preventing the fibers from being wound on the locking member 33 and the rod body 31, further greatly reducing the rotational torque, and discharging the chips generated during the locking process along the cutting threads 34 to achieve the effect of fast chip removal and preventing the locking process from being blocked by the chips, in addition, part of the chips are accumulated between the cutting grooves 343, the cutting grooves 344 and the cutting threads 34 after locking, which is helpful to increase the drawing force and improve the engagement stability of the screw 3.

Referring to fig. 7 to 9, the second preferred embodiment of the present invention still includes the components described in the previous embodiment, and the present embodiment particularly includes: the slots 344 are inwardly opened to extend to the root 3433, so that any two slots 344 are communicated with each other, and therefore, the enlarged slots 344 are not only beneficial to guiding and rapidly discharging chips, but also can accommodate more chips, so as to achieve a tighter engagement between the screw 3 and the locking member 4, thereby improving the pulling force and the engagement stability of screwing the screw 3.

In summary, the screw with low twist-lock torque of the present invention is configured with the cutting grooves and the grooves at the joint of the upper tooth surface and the lower tooth surface to form the first cutting edges, the second cutting edges, the upper peaks and the lower peaks, so that the first cutting edges and the second cutting edges can cooperate with the upper peaks and the lower peaks to rapidly expand the holes, and increase the overall cutting speed, and simultaneously effectively chop the fibers of the locking material to reduce the twist-lock torque, and further cooperate with the cutting grooves and the cutting grooves to properly receive and press part of the chips, thereby increasing the pulling force and improving the engagement stability after screwing.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw with low twist lock torsion comprises a rod body, a screw head arranged at one end of the rod body, a locking part opposite to the screw head and arranged at the other end of the rod body, and a plurality of cutting screw teeth arranged on the rod body and extending towards the locking part; wherein the locking part is tapered to form a drill point; the method is characterized in that:

each cutting screw tooth comprises an upper tooth surface extending downwards from the rod body, a lower tooth surface extending upwards from the rod body, a plurality of cutting grooves formed at the joint of the upper tooth surface and the lower tooth surface, and a plurality of grooves concavely formed at the joint of the upper tooth surface and the lower tooth surface; each cutting groove is provided with a first cutting edge, a second cutting edge connected with the first cutting edges, and a tooth bottom formed at the joint of the first cutting edge and the second cutting edge, a base line is defined in the cutting groove, and an upper tooth crest and a lower tooth crest are respectively formed at two ends of each cutting groove.

2. The screw with low torque of claim 1, wherein the cutting threads are arranged in a wave shape.

3. The screw of claim 1, wherein the slots are inwardly open to the root to connect any two slots to each other.

4. The screw with low torque of rotation lock as claimed in claim 1, wherein the first cutting edge and the second cutting edge are disposed at different angles of inclination.

5. The screw of claim 1, wherein the upper thread surface extends outwardly to meet the base thread at an angle different from an angle at which the lower thread surface extends outwardly to meet the base thread.

6. The screw of claim 1, wherein the shank has a plurality of auxiliary threads, and the auxiliary threads are disposed in a full thread form.