TWM511559U - Screw - Google Patents

Description

Screw

This creation relates to a screw, especially a screw suitable for use in wood, building materials or the like.

On wooden workpieces including furniture, decoration and construction, wood is used in large quantities or composite wood made of plastic resin and wood chips. The connection between the wooden workpieces is usually locked by screws.

1 shows a conventionally used screw 10 for a wood panel comprising a round shaft 12 and threads 14 provided on the shaft 12. The rod body 12 includes an insertion end 16 and a head end 17, and the insertion end 16 is provided with a cutting groove 18, and the head end 17 is provided with a plurality of ribs 19. When the screw 10 is screwed into the plate to be joined with the insertion end 16, the tail groove 18 can be used to cut the plate so that the thread 14 can be smoothly screwed into the plate, and the rib 19 can be used for reaming so that the head end 17 is buried. Inside the board.

However, the cutting groove 18 of the screw 10 of FIG. 1 extends along the axial direction of the rod body 12, the efficiency of cutting the wood fiber is not high, the screwing torque cannot be improved, the operation is laborious, and the plate is easily generated by the pressing. Cracked. Furthermore, when the screw 10 is screwed into the plate to form a drill hole, the wood chips will overflow from the hole and remain around the surface of the plate, causing the surface of the plate to be uneven. In addition, the thread 14 of the screw 10 of Fig. 1 can only provide a screwing action for forward rotation, and does not have the effect of pulling force and anti-reverse rotation. Therefore, when the screw 10 of Fig. 1 combines the two plates, the screw 10 is often loosened in the pulling direction due to vibration or other factors, causing the locked plate to loosen.

The purpose of the present invention is to provide a screw suitable for use in a sheet material, which can effectively improve the flatness of the surface of the sheet after being locked into the sheet, and can enhance the pulling force of the screw and the anti-rotation function. In addition, the created screws enhance the efficiency of cutting wood fibers to improve the performance of the screws through the sheet.

The screw of the present invention comprises a rod body and a first thread, the rod body comprising an insertion end and a head end separated by a longitudinal axis, the rod body further comprising a straight rod portion between the insertion end and the head end The head end has an outer diameter larger than the straight portion and includes an upper portion and a lower portion. The bottom periphery of the upper portion is provided with a blade portion for cutting the sawdust, and the lower portion abuts the upper end of the straight portion and is formed toward the straight rod. The tapered portion has a tapered shape, the lower portion has a circular peripheral surface, and the lower peripheral surface is provided with a plurality of anti-rotation teeth, and each of the anti-rotation teeth protrudes from the peripheral surface of the lower portion and has a triangular shape The anti-rotation tooth includes a guiding surface and a stopping surface, and an angle between the guiding surface and the surrounding surface of the lower portion is greater than 90 degrees, and a forming surface is formed between the stopping surface and the surrounding surface of the lower portion Groove. The first thread is disposed on the straight portion of the rod body and includes a plurality of threaded teeth, each thread having a first cutting surface facing the insertion end and a second cutting surface facing away from the insertion end, the first cutting surface and the first cutting surface The angle of the horizontal axis is between 25 and 45 degrees, the horizontal axis being perpendicular to the longitudinal axis, and the angle between the second cutting surface and the horizontal axis is between 3 and 23 degrees.

In an embodiment, the peripheral surface of the lower portion is provided with four anti-rotation teeth separated at equal angles along the circumferential direction of the head end, and the guiding surfaces of the anti-rotation teeth are close to the tangent The circumference extends outwardly in an arc shape, and an angle between the stop surface and the lower peripheral surface is less than 90 degrees. In another embodiment, the guide surfaces of each of the anti-rotation teeth extend outwardly from the circumference in a tangential manner such that the lower portion has a square shape, and the stop surface and the periphery of the lower portion The angle between the faces is greater than 90 degrees.

In one embodiment, the outer diameter of the upper portion is larger than the outer diameter of the lower upper end, and the inner side of the blade portion has a sloped surface, and a concave portion is formed between the blade portion and the peripheral surface of the lower upper end. The upper end of each of the anti-rotation teeth extends into the recess and is connected to or adjacent to the slope of the blade, and the lower end of each of the anti-rotation teeth extends to the straight portion.

Other objects, advantages and features of the present invention will be apparent from the following description of the preferred embodiments illustrated herein.

10‧‧‧ screws
12‧‧‧ rod body

14‧‧‧ thread
16‧‧‧Insert

17‧‧‧ head end
18‧‧‧Tail slot

19‧‧‧ rib

20‧‧‧ screws
22‧‧‧ rod body

24‧‧‧Insert
26‧‧‧ head end

28‧‧‧ Straight section
30‧‧‧ lower section

32‧‧‧上段
34‧‧‧Tail slot

36‧‧‧First thread
38‧‧‧second thread

40‧‧‧ thread
42‧‧‧First cutting surface

44‧‧‧Second cutting surface
46‧‧‧ thread

47‧‧‧No threaded section
48‧‧‧ Third thread

49‧‧‧Down cutting surface
50‧‧‧ upper

51‧‧‧Upper cutting surface
52‧‧‧ lower

53‧‧‧around faces
54‧‧‧Anti-rotation

55‧‧‧In the direction of the screw
56‧‧‧Guide

57‧‧‧Retreating direction
58‧‧‧stop surface

59‧‧‧ Groove
60‧‧‧ hole

61‧‧‧ ridgeline
62‧‧‧blade

63‧‧‧Bevel
64‧‧‧ recess

66‧‧‧Upper
67‧‧‧ gap

68‧‧‧Bottom

Figure 1 shows a schematic view of a conventional screw.

Fig. 2 is a perspective view of a screw of an embodiment of the present invention.

Figure 3 shows a plan view of the screw of Figure 2.

Figure 4 shows a cross-sectional view taken along line 4-4 of Figure 2.

Figure 5 shows a cross-sectional view taken along line 5-5 of Figure 3.

Figure 6 shows a cross-sectional view taken along line 6-6 of Figure 3.

Figure 7 shows a partial enlarged view of the screw of Figure 4.

Figure 8 shows a cross-sectional view taken along line 8-8 of Figure 3.

Figure 9 is a partial perspective view of a screw of another embodiment of the present invention.

Figure 10 is a cross-sectional view similar to Figure 6 showing another embodiment of anti-rotation teeth.

Figure 11 is a plan view of a screw of still another embodiment of the present invention.

Figure 12 shows a cross-sectional view taken along line 12-12 of Figure 11.

Figure 13 is a perspective view of a screw of still another embodiment of the present invention.

The preferred embodiment of the present invention will now be described by way of example only and not by way of limitation,

2 through 8 show a screw 20 constructed in accordance with an embodiment of the present invention. The screw 20 includes a shaft 22 that includes an insertion end 24 and a head end 26 that are separated by a longitudinal axis. The insertion end 24 has a tapered cross section with an included angle (A) between 20 and 50 degrees (see Figure 7), preferably 30 degrees. The rod body 22 has a straight rod portion 28 having an outer diameter substantially equal between the insertion end 24 and the head end 26, the straight rod portion 28 including a lower portion 30 adjacent the insertion end 24 and an upper portion 32 adjacent the head end 26, wherein the lower portion 30 Individually with the upper section 32 has a circular cross section. The lower section 30 is provided with at least one cutting slot 34. In the embodiment, the lower section 30 is provided with four cutting slots 34 (see FIG. 5) which are equally spaced along the circumferential direction of the rod 22, and each cutting slot The lower end of the 34 is spaced apart from the insertion end 24, and the direction in which each of the cutting grooves 34 extends forms an angle (B) with the longitudinal axis, and the included angle (B) is preferably between 3 and 9 degrees (see Fig. 2). The number of tail grooves 34 can effectively improve the efficiency of the screw 20 for cutting wood fibers.

The screw 20 further includes a first thread 36 and a second thread 38. The first thread 36 is spirally disposed around the outer periphery of the lower portion 30 of the shaft 22 and includes a plurality of threads 40. Each thread 40 is an asymmetrical thread. (See Figure 7). Each thread 40 has a first cutting face 42 on the locking side (ie facing the insertion end 24) and a second cutting face 44 on the exit side (backward insertion end 24). The angle (C1) between the first cutting surface 42 and a horizontal axis is preferably 35 ± 10 degrees, that is, between 25 and 45 degrees, preferably 35 ± 5 degrees, that is, between 30 and 40 degrees. The axis is perpendicular to the longitudinal axis. The angle (C2) between the second cutting face 44 and the horizontal axis is preferably 13 ± 10 degrees, that is, between 3 and 23 degrees, preferably 13 ± 5 degrees, that is, between 8 and 18 degrees. The second thread 38 is spirally disposed around the outer periphery of the upper portion 32 of the shaft 22 and includes a plurality of threads 46. The second thread 38 is rotated in the opposite direction from the first thread 36. Moreover, the upward direction of the first thread 36 is in the same direction as the direction in which the tail groove 34 extends upward (see FIG. 2).

In the present embodiment, there is a non-threaded section 47 between the lower section 30 and the upper section 32 of the rod body 22, and the screw 20 further includes a third thread 48, and the third thread 48 is spirally disposed on the rod body 22. The outer periphery of the lower section 30 is spaced apart from the first thread 36. The height of thread of the third thread 48 is less than the height of the thread of the first thread 36. Furthermore, the third thread 48 comprises a plurality of asymmetrical threads, each thread having a lower cutting surface 49 facing the insertion end 24 and an upper cutting surface 51 facing away from the insertion end 24 (see Figure 7), the lower cutting surface 49 and The angle (C3) of the horizontal axis is preferably 35 ± 10 degrees, that is, between 25 and 45 degrees, preferably 35 ± 5 degrees, that is, between 30 and 40 degrees, the lower cutting surface 51 and the horizontal axis The angle (C4) is preferably 13 ± 10 degrees, that is, between 3 and 23 degrees, and most preferably 13 ± 5 degrees, that is, between 8 and 18 degrees.

The outer diameter of the head end 26 is larger than the straight rod portion 28 and includes an upper portion 50 and a lower portion 52 that abuts the upper end of the straight rod portion 28 and forms a tapered shape that tapers toward the straight rod portion 28. The peripheral surface 53 of the lower portion 52 is provided with a plurality of anti-rotation teeth 54. In the present embodiment, the peripheral surface 53 has a circular cross section, and the peripheral surface 53 of the lower portion 52 is provided with four anti-rotation teeth 54 (see FIG. 6) which are equally spaced along the circumferential direction of the head end 26. Each of the anti-rotation teeth 54 protrudes from the peripheral surface 53 of the lower portion 52 and has a substantially triangular cross section. Each of the anti-rotation teeth 54 includes a guiding surface 56 and a stopping surface 58. The guiding surface 56 is in contact with the stopping surface 58 to form a ridge line 61. The guiding surface 56 extends obliquely or arcuately outwardly from the peripheral surface 53 in a nearly tangent manner, thereby improving the guiding effect of the screw 20 in the screwing direction 55. Furthermore, a groove 59 is formed between the stop surface 58 and the peripheral surface 53 for chipping, so that the bonding between the screw 20 and the plate material is stronger. In the present embodiment, the angle (D1) between the guiding surface 56 and the peripheral surface 53 of the lower portion 52 is between 90-180 degrees, preferably between 150-180 degrees, and the blocking surface 58 and the lower portion 52. The angle (D2) between the peripheral faces 53 is less than 90 degrees (see Fig. 8), preferably between 30 and 90 degrees, and most preferably between 45 and 85 degrees, thereby increasing the resistance in the reversing direction 57, and The amount of chipping of the lower portion 52 can be increased. The top mask of the upper portion 50 has a socket 60 for insertion of a driver tool (not shown), and the bottom periphery of the upper portion 50 is provided with a pointed blade portion 62 which can be used to cut wood chips or debris. In the present embodiment, the outer diameter of the upper portion 50 is larger than the outer diameter of the upper end of the lower portion 52, and the inner side of the blade portion 62 has a slope 63 so that a recess 64 is formed between the blade portion 62 and the peripheral surface 53 of the upper end of the lower portion 52 (see Figure 4). Moreover, each of the anti-rotation teeth 54 includes an upper end 66 and a lower end 68, and the lower end 68 of each anti-rotation tooth 54 extends to the upper portion 32 of the straight rod portion 28, and the apex 61 of each anti-rotation tooth 54 extends to the top end to The recess 64 is connected to or adjacent to the ramp 63 of the blade 62. A gap 67 (see FIG. 4) is formed between the upper end 66 of each of the anti-rotation teeth 54 and the bottom edge of the blade portion 62, so that after the blade portion 62 cuts the sheet material, the sheet fiber can be pulled and pinched, and then passed down through the upper portion 50. After extrusion, the fibers are not exposed outside the drilled hole to maintain the flatness of the surface of the sheet.

A modified embodiment of the blade portion 62 is shown in Fig. 9, in which the blade portion 62 is formed in a zigzag shape. A variant embodiment of the anti-rotation tooth 54 is shown in Fig. 10. In this embodiment, the guide surface 56 extends outwardly from the peripheral surface 53 in a tangential manner such that the lower portion 52 has a square shape ( As shown by the imaginary line of FIG. 10, in addition, the angle between the stop surface 58 and the peripheral surface 53 of the lower portion 52 is greater than 90 degrees. The lower portion 52 having a quadrangular cross section reduces the resistance of the screw 20 in the locking direction (the contact surface between the peripheral surface 53 and the sheet material can be reduced) so that the screw 20 can be easily screwed completely into the sheet. Further, the groove 59 formed between the stopper surface 58 and the circular arc peripheral surface 53 can also improve the anti-rotation effect.

The screw 20 of the present invention is implemented by locking the workpiece (not shown) such as a wood board with the insertion end 24. Since the direction in which the tail groove 34 extends upward is in the same direction as the upward direction of the first thread 36 of the lower section 30, the first thread 36 and the tail groove 34 are formed when the insertion end 24 of the screw 20 is screwed into the plate. At the same time, the sheet is cut and screwed in, and the waste generated by cutting the sheet is squeezed into the cutting groove 34, so that the resistance of the screw 20 in the locking direction is reduced.

The screw 20 of the present creation has the following advantages:

1. The first cutting face 42 of the asymmetrical screw 40 can increase the penetration force of the screw 20 in the locking direction and the second cutting face 44 makes the screw 20 difficult to withdraw, thereby improving the bonding force of the screw 20 and reinforcing the screw 20 Pulling force to achieve the purpose of firmly connecting the workpiece.

2. The blade portion 62 of the head end 26 can be used to cut the wood chips or debris on the surface of the plate to enhance the function of cutting the hole of the plate, thereby effectively improving the flatness of the surface of the plate.

3. When the screw 20 is locked into the wood panel, the guiding surface 56 of the anti-rotation tooth 54 has the effect that the leading end 26 is screwed into the panel so that the head end 26 of the screw 20 can be densely embedded in the panel. In addition, when the screw 20 is to be moved out of the direction of the sheet, the stop surface 58 of the anti-rotation tooth 54 contacts the sheet to prevent the screw 20 from coming loose.

4. Equally angular separation of the tail slots 34 provided on the shank 22 enhances the efficiency of the screw 20 in cutting wood fibers.

Figures 11 and 12 show a screw 20 of another embodiment of the present invention. In this embodiment, the lower section 30 has a generally triangular transverse section and the upper section 32 has a circular transverse section. Furthermore, the direction of rotation of the second thread 38 is the same as the direction of rotation of the first thread 36. The lower section 30 of the triangular section can advantageously lead to the discharge of the waste material of the sheet, so that the resistance of the screw 20 in the locking direction is reduced. In addition, the second thread 38 and the first thread 36 are both positive teeth, which can increase the guiding effect. Thus, the screw 20 of this embodiment can be particularly suitable for hard (wooden density) sheet joining.

Figure 13 shows a screw 20 of yet another embodiment of the present invention. In this embodiment, only the first thread 36 is provided on the shaft 22, and there is no unthreaded section between the lower section 30 and the upper section 32.

In the foregoing specification, the present invention has been described only in terms of some embodiments, and various changes or modifications may be made in accordance with the features of the present invention. Therefore, obvious substitutions and modifications to those skilled in the art will still be incorporated in the scope of the patent claimed herein.

20‧‧‧ screws

22‧‧‧ rod body

24‧‧‧Insert

26‧‧‧ head end

28‧‧‧ Straight section

30‧‧‧ lower section

32‧‧‧上段

34‧‧‧Tail slot

36‧‧‧First thread

38‧‧‧second thread

40‧‧‧ thread

42‧‧‧First cutting surface

44‧‧‧Second cutting surface

46‧‧‧ thread

47‧‧‧No threaded section

48‧‧‧ Third thread

50‧‧‧ upper

52‧‧‧ lower

53‧‧‧around faces

54‧‧‧Anti-rotation

60‧‧‧ hole

61‧‧‧ ridgeline

62‧‧‧blade

62‧‧‧blade

63‧‧‧Bevel

64‧‧‧ recess

66‧‧‧Upper

67‧‧‧ gap

68‧‧‧Bottom

Claims (10)

[Item 1] A screw that includes:
a rod body comprising an insertion end and a head end separated by a longitudinal axis, the rod body further comprising a straight rod portion between the insertion end and the head end, the head end having an outer diameter larger than the straight rod portion and including An upper portion and a lower portion, the bottom periphery of the upper portion is provided with a blade portion for cutting wood chips, the lower portion abutting the upper end of the straight rod portion and forming a tapered shape which is tapered toward the straight rod portion, the lower portion having a circle a peripheral surface of the shape and a peripheral surface of the lower portion is provided with a plurality of anti-rotation teeth, each of the anti-rotation teeth protruding from the peripheral surface of the lower portion and including a guiding surface and a stopping surface, the guiding surface and the lower portion The angle between the peripheral faces is greater than 90 degrees, a groove is formed between the stop face and the peripheral surface of the lower portion; and a first thread is disposed on the straight portion of the shaft and includes a plurality of threads, Each thread is an asymmetrical thread and has a first cutting face facing the insertion end and a second cutting face facing away from the insertion end, the first cutting face being at an angle of between 25-45 degrees with a horizontal axis, the level The axis is perpendicular to the longitudinal axis, and the angle between the second cutting surface and the horizontal axis is 3-2 Between 3 degrees. [Item 2] According to the screw of the first aspect of the patent application, the peripheral surface of the lower portion is provided with four anti-rotation teeth separated at equal angles along the circumferential direction of the head end, and the guiding surfaces of the anti-rotation teeth are close to each other. The cutting manner extends from the circumference toward the outside in an arc shape, and an angle between the stopping surface and the peripheral surface of the lower portion is less than 90 degrees. [Item 3] According to the screw of the second aspect of the patent application, the angle between the stop surface and the peripheral surface of the lower portion is between 45 and 85 degrees. [Item 4] The screw according to the first aspect of the patent application, wherein the lower portion has a circular peripheral surface, and the peripheral surface is provided with four anti-rotation teeth separated at equal angles along the circumferential direction of the head end, and each anti-rotation tooth The guiding surface extends outwardly from the circumference in a tangential manner such that the lower portion has a square shape and the angle between the stopping surface and the peripheral surface of the lower portion is greater than 90 degrees. [Item 5] The screw according to the first aspect of the invention, wherein the straight portion includes a lower portion adjacent to the insertion end and an upper portion adjacent to the front end, and a lower portion of the rod body is provided with at least one cutting groove, the extending direction of the cutting groove The longitudinal axis forms an angle that is between 3 and 9 degrees. [Item 6] According to the screw of claim 1, wherein the outer circumference of the upper section is provided with a second thread, the first thread is disposed at a lower portion of the straight portion, and the lower portion of the rod is further provided with a third thread, the third a thread is spaced apart from the first thread, the thread height of the third thread being less than a thread height of the first thread, the third thread comprising a plurality of asymmetrical threads, each thread having a lower cutting surface facing the insertion end And an upper cutting surface facing away from the insertion end, the angle of the lower cutting surface and the horizontal axis being between 25 and 45 degrees, and the angle between the upper cutting surface and the horizontal axis is between 3 and 23 degrees. [Item 7] A screw according to the first aspect of the invention, wherein the straight portion includes a lower portion adjacent the insertion end and an upper portion adjacent the end end, the lower portion having a substantially triangular transverse cross section, the upper portion having a circular transverse cross section. [Item 8] A screw according to the first aspect of the invention, wherein an outer diameter of the upper portion is larger than an outer diameter of the lower upper end, the inner side of the blade portion has a sloped surface, and a concave portion is formed between the blade portion and a peripheral surface of the lower upper end. [Item 9] A screw according to item 8 of the patent application, wherein the blade portion is formed in a zigzag shape. [Item 10] According to the screw of item 8 of the patent application, each of the anti-rotation teeth includes an upper end and a lower end, and the lower end of each anti-rotation tooth extends to the upper portion of the straight rod portion, and the upper end of each anti-rotation tooth extends to the concave portion It is connected to or close to the slope of the blade.