TWI535941B - Fixing assembly and countersunk-head screw thereof - Google Patents

Description

Locking assembly and countersunk head screw

The present invention relates to a locking assembly, and more particularly to a locking assembly having a countersunk screw.

In order to satisfy consumers' desire to solve the problem of the heavy weight and bulkiness of today's electronic devices, various manufacturers are working to make the structure of electronic devices lighter and thinner. Therefore, under the premise of maintaining the performance of electronic devices, how to reduce the weight and volume has become the goal of various manufacturers.

In order to reduce the weight and volume of the housing of the electronic device, the housing comprises an upper thin plate and a lower thin plate, and the screws are locked to each other by a screw, so as to reduce the volume and reduce the weight thereof. In the prior art, in order to increase the locking force of the screws for the two thin plates, the upper thin plate is provided with a countersunk hole, and the lower thin plate is correspondingly punched with a punching convex hole, and a countersunk screw is attached to the upper thin plate. Wear it in. The countersunk screw has a bevel to match the counterbore of the upper sheet.

However, in order to further improve the locking force of the countersunk screw, the surface area of the counterbore can be increased to increase the contact area between the wall surface of the counterbore and the inclined surface of the countersunk screw, thereby increasing the tight fit of the countersunk screw to the upper plate. effect. Thus, the wall of the counterbore and the axis of the countersunk screw will have a large acute angle. However, the thinner the head of the countersunk screw must be, and the slope of the countersunk screw must be inclined to the axis to match the wall of the counterbore. In addition, in the process of punching the lower sheet, the chamfer of the lower sheet often has a limit value of the lead angle, which is compared with the angle between the wall surface of the counterbore and the axis of the countersunk head screw, and the chamfering and countersunking The shaft of the screw has a small acute angle. When the countersunk screw is locked to the upper and lower plates, the countersunk screws cannot be matched with the countersunk holes and the chamfers. The inclined surface of the countersunk screws can easily interfere with chamfering or squeezing, and the countersunk screws protrude from The upper plate is lowered, which in turn causes a decrease in the overall locking force.

Therefore, the current countersunk screws cannot be matched to the upper and lower sheets at the same time, which causes the countersunk screws to protrude from the upper sheet and the countersunk screws to be easily broken, thereby causing a problem of poor locking force.

In view of the above problems, the present invention discloses a locking assembly and a countersunk head screw thereof, thereby solving the problem of poor locking force in the above locking assembly.

An embodiment of the invention discloses a countersunk screw comprising a threaded portion and a head. The threaded portion has an axis. The head is disposed at one end of the threaded portion and has a first annular wall and a second annular wall. The second annular wall is interposed between the first annular wall and the threaded portion. A first acute angle is sandwiched between the first annular wall and the axial center, and a second acute angle is sandwiched between the second annular wall and the axial center, and the first acute angle is different from the second acute angle.

Another embodiment of the invention discloses a locking assembly, including a a first plate member, a second plate member, and the countersunk screw described above. The first plate has a first surface and a second surface opposite to each other and a counterbore. The counterbore extends through the first surface and the second surface, and the inner diameter of the counterbore tapers from the first surface toward the second surface. The second plate member is disposed on the second surface and includes a body and a pumping column. The body has a third surface and a fourth surface opposite to each other, the third surface faces the second surface, and the extraction column is disposed on the fourth surface. The second plate member has a punching hole corresponding to the counterbore hole and penetrating through the third surface of the body and the fourth surface and the extraction column, and the extraction hole has a chamfered portion adjacent to the third surface . The countersunk screw is threaded through the counterbore and the extraction hole, and the countersunk screw includes a threaded portion and a head. The threaded portion has an axial center, and the head portion is disposed at one end of the threaded portion. The head has a first annular wall and a second annular wall, and the second annular wall is interposed between the first annular wall and the threaded portion. A first acute angle is sandwiched between the first annular wall and the axial center, and a second acute angle is sandwiched between the second annular wall and the axial center, and the first acute angle is different from the second acute angle. The threaded portion is locked to the extraction hole. The second annular wall abuts against the chamfered portion of the extraction hole, and the first annular wall abuts against the wall surface forming the counterbore.

According to the locking assembly and the countersunk head screw disclosed by the present invention, since the countersunk screw has a first annular wall surface and a second annular wall surface, and the first acute angle is different from the second acute angle, when the countersunk screw is worn When the countersunk hole and the extraction hole are provided, the first annular wall surface of the countersunk screw is abutted against the wall surface forming the counterbore hole, and the second annular wall surface of the countersunk screw abuts against the chamfered portion of the extraction hole . In this way, the countersunk screw can be matched to the counterbore and the extraction hole to securely pass through the counterbore And the dental hole, and the countersunk screw does not protrude from the first plate. Therefore, the locking assembly of the present invention and the countersunk head screw solve the problem of poor locking force in the prior art.

The above description of the present invention and the following description of the embodiments of the present invention are intended to illustrate and explain the principles of the invention.

1‧‧‧Locking components

10‧‧‧First board

11‧‧‧ first surface

12‧‧‧ second surface

13‧‧‧ countersunk hole

131‧‧‧First inner wall

132‧‧‧Second inner wall

20‧‧‧Second board

21‧‧‧ body

213‧‧‧ third surface

214‧‧‧ fourth surface

22‧‧‧Drawing column

221‧‧‧ teeth

222‧‧‧ bottom

23‧‧‧Drawing holes

231‧‧‧Chamfering

233‧‧‧ third inner wall

30‧‧‧ countersunk head screws

31‧‧‧Threading Department

312‧‧ ‧ thread

32‧‧‧ head

321‧‧‧First ring wall

322‧‧‧Second ring wall

323‧‧‧ Third ring wall

324‧‧‧ top surface

325‧‧‧ grooves

A‧‧‧Axis

Θ1‧‧‧first acute angle

Θ2‧‧‧second acute angle

1 is a cross-sectional view of a locking assembly in accordance with an embodiment of the present invention.

2 is an exploded cross-sectional view of a locking assembly in accordance with an embodiment of the present invention.

The detailed features and advantages of the present invention are set forth in the Detailed Description of the Detailed Description of the <RTIgt; </ RTI> <RTIgt; </ RTI> </ RTI> </ RTI> <RTIgt; The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but are not intended to limit the scope of the invention.

An embodiment of the present invention provides a locking assembly that can be applied to a housing of an electronic device. The housing may be of a thinner design, but is not intended to limit the scope of the invention.

Please refer to FIG. 1 and FIG. 2 together, wherein FIG. 1 is a schematic cross-sectional view of a locking assembly according to an embodiment of the present invention, and FIG. 2 is an embodiment according to the present invention. An anatomical cutaway view of the locking assembly of the example. One embodiment of the present invention discloses a locking assembly 1 including a first plate member 10, a second plate member 20, and a countersunk head screw 30. The first plate member 10 is disposed on the second plate member 20, and the countersunk head screw 30 is disposed through the first plate member 10 and the second plate member 20. The first plate member 10 and the second plate member 20 are fixedly coupled to each other.

The first plate member 10 of the present embodiment will be described in detail below. The first plate member 10 has a first surface 11 and a second surface 12 opposite to each other and a counterbore 13 . The counterbore 13 extends through the first surface 11 and the second surface 12, and the inner diameter of the counterbore 13 tapers from the first surface 11 toward the second surface 12. In the present embodiment, the counterbore 13 is formed by a milling machine by means of a milling machine, but this processing is not intended to limit the invention.

The second panel 20 of the present embodiment will be described in detail below. The second plate member 20 includes a body 21, a pumping column 22 and a punching hole 23. The body 21 has a third surface 213 and a fourth surface 214 opposite to each other, and the third surface 213 faces the second surface 12 of the first panel 10. The extraction column 22 is disposed on the fourth surface 214. The punching hole 23 corresponds to the counterbore 13 of the first plate member 10 and penetrates through the third surface 213, the fourth surface 214 and the extraction column 22 of the body 21. In the embodiment, the counterbore 13 has a first An inner wall 131 and a second inner wall 132, the first inner wall 131 is interposed between the first surface 11 and the second inner wall 132, and the inner diameter of the second inner wall 132 is tapered from the first inner wall 131 to Second surface 12. again In this embodiment and some other embodiments, the extraction post 22 has a bottom surface 222 that is located on the opposite side of the third surface 213. The punching hole 23 has a chamfered portion 231 adjacent to the third surface 213, a third inner wall 233 adjacent to the bottom surface 222, and a third inner wall 233 having a tooth portion 221. In detail, in the present embodiment, the second plate member 20 is punched out of the extraction hole 23 by press working, and then the aperture of the extraction hole 23 is extended and extended to form the extraction column 22 and chamfering. Part 231.

The countersunk screw 30 of this embodiment will be described in detail below. The countersunk head screw 30 is disposed through the counterbore 13 of the first panel 10 and the extraction aperture 23 of the second panel 20. The countersunk head screw 30 includes a threaded portion 31 and a head portion 32. The threaded portion 31 has an axis A. The head 32 is disposed at one end of the threaded portion 31 and has a first annular wall surface 321 and a second annular wall surface 322. The second annular wall surface 322 is interposed between the first annular wall surface 321 and the threaded portion 31. A first acute angle θ1 is sandwiched between the first annular wall surface 321 and the axial center A, and a second acute angle θ2 is sandwiched between the second annular wall surface 322 and the axial center A, and the first acute angle θ1 is different from the second acute angle θ2. . In more detail, the second acute angle θ2 is larger than the first acute angle θ1 and the threaded portion 31 of the countersunk screw 30 is tightly locked to the extraction hole 23 of the second plate member 20. In addition, when the countersunk head screw 30 is locked to the first plate member 10 and the second plate member 20, the second annular wall surface 322 abuts against the chamfered portion 231 of the extraction hole 23, and the first annular wall surface 321 is abutted. The wall surface of the counterbore 13 (i.e., the first inner wall 131 and the second inner wall 132) is formed. In the present embodiment, the head 32 further has a top surface 324 and a third annular wall surface 323. The top surface 324 is located opposite to the connecting thread portion 31 One side. The top surface 324 has a groove 325. A screwdriver (not shown) can be inserted into the groove 325 to rotate the countersunk screw 30, so that the countersunk screw 30 can be locked or detached to the first plate 10 and the second. Plate 20. Furthermore, the third annular wall surface 323 is interposed between the top surface 324 and the first annular wall surface 321 . The first inner wall 131 corresponds to the third annular wall surface 323, and the top surface 324 does not protrude and is aligned with the first surface 11.

In summary, according to the locking assembly and the countersunk head screw disclosed in the present invention, the countersunk screw has a first annular wall surface and a second annular wall surface, and the first annular wall surface and the axis of the countersunk screw The first acute angle is different from the second acute angle between the second annular wall and the axis. Therefore, the first annular wall surface is matched with the wall surface of the counterbore, and the second annular wall surface is matched with the chamfered portion of the extraction hole so that the countersunk screw does not protrude from the first plate (ie, the top surface is not protruding and cut The first surface is added, and the contact area of the countersunk screw with the first plate and the second plate is increased, so that the countersunk screw is stably penetrated through the counterbore and the hole. Therefore, the locking assembly of the present invention and the countersunk screw thereof solve the problem of poor locking force in the prior art under the design of the thinned casing, and improve the stability of the casing.

While the present invention has been described above in terms of the preferred embodiments thereof, it is not intended to limit the invention, and the invention may be modified and modified without departing from the spirit and scope of the invention. The patent protection scope of the invention is subject to the definition of the scope of the patent application attached to the specification.

1‧‧‧Locking components

10‧‧‧First board

11‧‧‧ first surface

12‧‧‧ second surface

13‧‧‧ countersunk hole

131‧‧‧First inner wall

132‧‧‧Second inner wall

20‧‧‧Second board

21‧‧‧ body

213‧‧‧ third surface

214‧‧‧ fourth surface

22‧‧‧Drawing column

221‧‧‧ teeth

222‧‧‧ bottom

23‧‧‧Drawing holes

231‧‧‧Chamfering

233‧‧‧ third inner wall

30‧‧‧ countersunk head screws

31‧‧‧Threading Department

312‧‧ ‧ thread

32‧‧‧ head

321‧‧‧First ring wall

322‧‧‧Second ring wall

323‧‧‧ Third ring wall

324‧‧‧ top surface

325‧‧‧ grooves

A‧‧‧Axis

Θ1‧‧‧first acute angle

Θ2‧‧‧second acute angle

Claims (7)

a countersunk screw for setting in a countersunk hole, comprising: a threaded portion having an axial center; and a head disposed at one end of the threaded portion, the head having a first annular wall surface and a a second annular wall surface, the second annular wall surface being interposed between the first annular wall surface and the threaded portion, wherein the first annular wall surface and the axial center sandwich a first acute angle, the second annular shape a second acute angle is formed between the wall surface and the axial center, the first acute angle is different from the second acute angle; wherein the head of the countersunk screw has a top surface and a third annular wall surface, the third a ring-shaped wall surface between the top surface and the first annular wall surface, the counterbore having a first inner wall and a second inner wall, the first inner wall being interposed between the first surface and the first Between the two inner walls, the first annular wall faces against the second inner wall, and the first inner wall faces the third annular wall. The countersunk screw of claim 1, wherein the second acute angle is greater than the first acute angle. The countersunk screw of claim 2, wherein the top surface is located opposite to a side connecting the threaded portion, the top mask has a groove, and the head has a third annular wall surface, the third ring type The wall is between the top surface and the first annular wall. A locking component comprising: a first plate member having a first surface and a second surface opposite to each other and a counterbore hole, the counterbore hole penetrating the first surface and the second surface, the inner diameter of the counterbore hole being from the first The surface is tapered toward the second surface; a second plate is disposed on the second surface and includes a body and a pumping column, the body having a third surface and a fourth surface opposite to each other, the third The surface faces the second surface, the extraction column is disposed on the fourth surface, and the second plate has a punching hole corresponding to the counterbore and penetrates the third surface of the body and The fourth surface and the extraction post, and the extraction hole has a chamfered portion adjacent to the third surface; and a countersunk screw penetrating the counterbore hole and the extraction hole, the countersunk head The screw includes a threaded portion and a head portion, the threaded portion has an axial center, the head portion is disposed at one end of the threaded portion, the head portion has a first annular wall surface and a second annular wall surface, the second portion a ring-shaped wall surface between the first annular wall surface and the threaded portion, the first annular wall surface and A first acute angle is sandwiched between the axial centers, and a second acute angle is formed between the second annular wall and the axial center. The first acute angle is different from the second acute angle, and the threaded portion is locked to the punching hole The second annular wall abuts against the chamfered portion of the extraction hole, the first annular wall abuts against a wall surface forming the counterbore; wherein the head of the countersunk screw has a top And a third annular wall having the third annular wall between the top surface and the first annular wall Between the faces, the counterbore has a first inner wall and a second inner wall, the first inner wall being interposed between the first surface and the second inner wall, the first annular wall abutting And the first inner wall faces the third annular wall. The locking assembly of claim 4, wherein the top surface does not protrude from the first surface. The locking assembly of claim 4, wherein the second acute angle is greater than the first acute angle. The locking assembly of claim 4, wherein an inner diameter of the second inner wall tapers from the first inner wall to the second surface.