TWI679354B - Screw structure - Google Patents

Abstract

The screw structure of the present invention comprises a screw head, a rod body and a drill tail. The screw head, the rod body and the drill tail are integrally formed. The rod body has a central axis and the drill tail is set as a cone. Column shape, the taper angle of the drill tail is 5 ~ 30 degrees, a drill taper part is set at the end of the drill tail, a drill tip is set at the end of the drill taper part, the drill point is set at a position deviating from the center axis, the drill An asymmetrical one large and one small chip flute extends to the drill tip of the drill cone, and the asymmetrical two cutting edges are formed at the interface between the two chip flutes and the drill cone. The cutting edge is connected to the drill tip, and the included angle of the two drill cutting edges is 60 to 110 degrees. The abutment of the two chip grooves and the periphery of the drill tail forms an asymmetric two cutting edges, and the surface of the drill tail and the screw There is a guide thread extending from the screw joint, and the guide screw is discontinuous after passing through the two chip grooves; by this, the Tanda screw locks the object smoothly and the chip is discharged, and the required torque is small. , Fast and labor-saving locking of objects, screws can easily and completely lock objects.

Description

Screw structure

The present invention relates to a "screw", and more particularly to a screw structure with drilling ability.

The screw is a common fastener. Generally, the screw is cylindrical, and the surface is provided with a thread. The screw can be screwed with the object using the thread. The object must be provided with a screw hole corresponding to the thread before the screw can be used. Smooth screw lock, so there is a screw with the ability to drill, this screw can be used to tap into the object and screw the lock in the situation where the object can not be pre-set screw holes.

The screw structure with drilling ability is different depending on the material of the object to be locked. The smoothness of drilling and chip removal when the screw is locked directly affects the screwing speed and the required torque when the screw is locked. If the design of the screw's own thread can produce a smooth chip removal effect, the drilling speed of the lock must be light and fast, and the required torque is small, otherwise the resistance is large and the lock is slow, and the required torque is also large.

As shown in the first and second figures, it is a conventional screw with drilling ability. The screw 90 includes a screw head 91, a rod body 92 and a drill tail 93. The screw head 91 is used for Connected to the tool, the rod body 92 is integrally extended by the screw head 91, and the periphery is provided with a spirally surrounding screw tooth 921. The drill tail 93 is integrally formed at an end of the rod body 92 away from the screw head 91, and The screw teeth 921 around the periphery of the rod body 92 are connected. A drill cone portion 931 is provided at the end of the drill tail 93, and a drill point 9311 is provided at the end of the drill cone portion 931. The drill point 9311 is located at the center axis of the rod body 92. Position, in addition, there are two symmetrical rows of chip grooves 932 on the periphery of the drill tail 93 extending to the drill point 9311 of the drill cone portion 931. The two rows of chip grooves 932 and the drill cone portion 931 meet to form symmetrical two drill cuts. Edge 933, the two drill cutting edges 933 are connected with the drill point 9311, and the two chip grooves 932 form a symmetrical two cutting edges 934 at the contact with the periphery of the drill tail 93. When performing the screw lock operation, the drill point 9311 of the drill tail 93 of the screw 90 is abutted against the surface of the object, and the tool 90 is used to fit or clamp the screw head 91 of the screw 90, and the screw 90 is rotated by the tool, so that The drill point 9311 performs a drilling operation on the surface of the object. After the linear drill point 9311 is drilled into the surface of the object, it cooperates with the drilling edge 933 and the cutting edge 934 of the tail 93 to perform a drilling operation, which is generated during the drilling process. The chips are moved up and out along the drill tail 93 using the chip discharge groove 932, and then the guide screw 921 is locked in to complete the screwing operation of the screw 90.

However, the conventional screw 90 with drilling ability has a drill tip 9311 set at the central axis of the rod body 92, and two rows of chip grooves 932 are symmetrically arranged, so that the size of the two rows of chip grooves 932 is limited. When the screw 90 is locked into the object, the chip removal is not smooth. The torque to be applied is large, and the speed of locking the object is slow and laborious. In addition, the screw 90 is easily broken due to excessive torque, and the screw 90 cannot be screwed due to poor chip removal. Fully locked in.

In view of the above-mentioned shortcomings of the conventional screw with drilling ability, the inventors of the present invention finally came out of the present invention after considering and experimenting with sample ideas from multiple parties and trial and error corrections and modifications.

The invention provides a screw structure. The screw comprises: a screw head for connecting with a tool; a rod body, which is integrally extended by the screw head, is provided with spiral teeth around the periphery, and the rod body has a central axis. And a drill tail, which is integrally formed at the end of the rod body away from the screw head, the end of the drill tail close to the screw head is set as the first end, and the end of the drill tail far from the screw head is set as the second end , The drill tail is set in a conical column shape that tapers from the first end to the second end, the drill tail has a cone angle, the cone angle is set to 5 ~ 30 degrees, and the drill tail end is provided with a drill cone A drill point is set at the end of the drill cone portion, the drill point is set at a position deviating from the central axis, and a peripheral edge of the drill tail is provided with an asymmetrical one, one small and two rows of chip grooves extending to the drill point. Asymmetrical two cutting edges are formed where the two chip grooves meet the drill cone. The two cutting edges are connected to the drill point. The two cutting edges have an included angle, and the included angle is set to 60 to 110 degrees. And because the drill tip is set at a position deviating from the center axis, the two drill cutting edges extend out of unequal length, and the two rows of chip flutes and Asymmetrical two cutting edges are formed where the peripheral edges of the drill tail meet. A guide screw is extended from the surface of the drill tail to the screw of the screw, and the guide screw is discontinuous after passing through the two rows of chip grooves.

The main purpose of the screw structure of the present invention is that during the locking operation, chip removal is smooth, the required torque is small, the speed of locking the object is fast and labor-saving, and the screw is not easy to break due to excessive torque, and the screw can be easily Fully locked in.

The following is further described in conjunction with the drawings of the preferred embodiment of the present invention, in order to enable those familiar with the related technology of the present invention to implement it according to the statements in this specification.

Referring to the third to seventh figures, the screw structure of the present invention. The screw 1 includes: a screw head 10, a rod body 20 and a drill tail 30.

The screw head 10 is used for connecting with a tool.

The rod body 20 is integrally extended from the screw head 10 and is provided with spiral teeth 21 around the periphery. The rod body 20 has a central axis A.

The drill tail 30 is integrally formed at an end of the rod body 20 away from the screw head 10. An end of the drill tail 30 near the screw head 10 is set as a first end 31, and an end of the drill tail 30 remote from the screw head 10 is provided. For the second end 32, the drill tail 30 is set in a conical column shape that tapers from the first end 31 to the second end 32. The drill tail 30 has a cone angle θ1, and the cone angle θ1 is set to 5 ~ 30 Degrees (the taper angle θ1 of the drill tail 30 in the present embodiment is set to 15 degrees), a drill taper portion 33 is provided at the end of the drill tail 30, and a drill point 331 is provided at the end of the drill taper portion 33, and the drill point 331 is provided at Deviated from the position of the central axis A, the periphery of the drill tail 30 is provided with an asymmetrical one large and one small chip groove 34 extending to the drill tip 331 of the drill cone portion 33, and the two chip grooves 34 and the drill cone portion An asymmetrical two cutting edges 35 are formed at the junction of 33, the two cutting edges 35 are connected to the drill point 331, the two cutting edges 35 have an included angle θ2, and the included angle θ2 of the two cutting edges 35 is set to 60 ~ 110 degrees (the included angle θ2 of the two drill cutting edges 35 is set to 90 degrees in this embodiment), and because the drill point 331 is set at a position deviating from the center axis A, the two drill cutting edges 35 are unequal in length Extending, the two chip flutes 34 and An asymmetrical two cutting edge 36 is formed at the contact of the periphery of the drill tail 30, and a surface of the drill tail 30 is connected with the screw 21 of the screw 20 to extend a guide screw 37, and the guide screw 37 passes through the two The chip discharge groove 34 is discontinuously disconnected.

When the screw 1 of the present invention is locked into the object 2, as shown in the eighth and ninth figures, the drill tip 331 of the tail 30 of the screw 1 is positioned against the surface of the object 2, and the tool is fitted with the screw 10 of the screw 1 Or the clamp is connected, and the tool 1 drives the screw 1 to rotate, so that the drill point 331 performs a drilling operation on the surface of the object 2. After the drill point 331 is drilled into the surface of the object 2, the two asymmetric drills with the drill tail 30 are matched. The cutting edge 35 and the asymmetric two cutting edges 36 perform the drilling operation. At the same time, the chips generated during the drilling process are smoothly discharged by using the asymmetric one large and one small two-row chip groove 34 along the drill tail 30 to move upward. Then, the object 2 is locked with the guide screw 37 and the screw 21 of the guide rod body 20, and the screwing operation of the screw 1 is completed quickly and labor-saving.

From the structure of the above specific embodiment, the following benefits can be obtained:

In the screw structure of the present invention, the drill point 331 is set at a position away from the center axis A, the drill tail 30 is set in a conical column shape, the two chip grooves 34, the two drill cutting edges 35, and the two cutting edges 36 are set asymmetrically. And the two chip grooves 34 form a large one and a small one. In accordance with the drill tail 30, the cone angle θ1 is set to 5-30 degrees, and the angle θ2 of the two drill cutting edges 35 is set to 60-110 degrees, so that the screw 1 locks into the object. 2 Chip removal is smooth, the torque to be applied is small, and the speed of locking the object 2 is fast and labor-saving. At the same time, the screw 1 is not easy to break due to excessive torque, and the screw 1 can be easily locked into the object 2 completely. Improved usability.

[Learning]

90‧‧‧Screw

91‧‧‧Screw head

92‧‧‧ shaft

921‧‧‧Screw

93‧‧‧Drilling

931‧‧‧drill cone

9311‧‧‧Drill Tip

932‧‧‧Chip

933‧‧‧Drilling cutting edge

934‧‧‧ cutting edge

[this invention]

1‧‧‧screw

2‧‧‧ objects

10‧‧‧Screw head

20‧‧‧ Rod

21‧‧‧Screw teeth

30‧‧‧Drilling

31‧‧‧ the first end

32‧‧‧ the second end

33‧‧‧Drill taper

331‧‧‧Drill Tip

34‧‧‧Chip

35‧‧‧Drilling cutting edge

36‧‧‧ cutting edge

37‧‧‧Guide screw

A‧‧‧center axis

The first picture is a perspective view of a conventional screw. The second figure is a plan view of the end of a conventional screw. The third figure is a perspective view of the screw of the present invention. The fourth figure is a plan view of the end of the screw of the present invention. The fifth figure is a side plan view of the screw of the present invention. The sixth figure is a plan view of the other side of the screw of the present invention. The seventh figure is another side plan view of the screw of the present invention. The eighth figure is a schematic view of the operation of locking the object by the screw of the present invention (1). The ninth figure is a schematic view of the operation of locking the object by the screw of the present invention (2).

Claims (3)

A screw structure comprising: a screw head for connecting with a tool; a rod body integrally extended by the screw head, and a peripheral spiral screw thread being provided on the periphery, the rod body having a central axis; and A drill tail is integrally formed at the end of the rod body away from the screw head. The end of the drill tail near the screw head is set as the first end, and the end of the drill tail far from the screw head is set as the second end. The tail is set in a conical column shape that tapers from the first end to the second end. The drill tail has a taper angle, the taper angle is set to 5 ~ 30 degrees, and the drill tail end is provided with a drill cone. The drill A drill point is set at the end of the taper portion, and the drill point is set at a position deviating from the center axis. The periphery of the drill tail is provided with an asymmetrical one, one small and two rows of chip grooves extending to the drill point. The abutment of the chip removal groove and the drill cone part forms an asymmetric two cutting edges. The two cutting edges are connected to the drill point. The two cutting edges have an included angle, and the included angle is set to 60 to 110 degrees. The drill point is set at a position deviating from the center axis, so the two drill cutting edges extend out of unequal length, and the two rows of chip flutes and the periphery of the drill tail An asymmetrical two cutting edge is formed at the edge of the edge, and a segment of a guide screw is extended from the drill tail surface to the screw of the screw, and the guide screw passes through the two rows of chip flutes and is discontinuous. The screw structure according to item 1 of the scope of patent application, wherein the taper angle of the drill tail is preferably 15 degrees. The screw structure according to item 1 of the scope of the patent application, wherein the angle between the two drill cutting edges is preferably 90 degrees.