TWI535939B - Screw - Google Patents

Description

Screw

The present invention relates to a screw, and more particularly to a screw having a spiral continuous groove for containing debris.

On wood objects 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 objects is usually by a screw having an insertion end at the end, the screw comprising a rod and at least one thread wound around the rod, so that the screw is rotatably screwed into the locked to be connected Within the compound. Furthermore, in order to increase the speed at which the screw is locked into an article such as wood, a design in which a groove is provided on the shaft of the screw or on the crest of the thread is proposed to accommodate the debris. To be clear, when the screw thread is screwed into the locked object, the wood is cut to produce debris (wood chips), which can be used to contain debris, so that the screw will not be damaged during the locking process. The swarf is hindered and the lock compound is less likely to crack. However, the grooves provided on the shaft or the screw peak can accommodate a limited amount of debris, causing most of the debris to accumulate in the upper portion of the screw, reducing the screwing speed of the screw and possibly causing the object to expand and rupture.

In the prior art, a design having a spiral flute groove on the shaft of the screw has been proposed (for example, the new type M373974 "screw with a spiral flute" in Taiwan), which has a periphery of the drill tail of the screw. The second symmetrical spiral-shaped chip ditch, and the screw can smoothly remove the chip and the effect of tapping and labor saving. However, such a chip flute is not only too wide in width but also has a large number of spiral turns (if it is to be extended) Extending the entire screw body), the thread can not be effectively engaged with the object, so as to reduce the bonding ability of the screw; in addition, the chip ditch will cause the strength of the screw to decrease, and the screw is easily broken during the locking process.

Accordingly, it is a primary object of the present invention to provide a screw having a continuous groove that can accommodate debris so that the screw can smoothly chip to increase the screwing speed, while the continuous groove does not lower the The bonding force between the screw and the object.

The screw constructed in accordance with the present invention comprises a rod, a thread, a plurality of ribs and a groove. The shaft includes an outer periphery and a head end and an insertion end separated by a longitudinal axis. The thread is helically wound around the outer periphery of the shaft and includes a plurality of threads. The number of ribs is disposed between adjacent two threads of the thread and is disposed on the outer circumference of the rod. The groove is spirally formed around the outer periphery of the rod and continuously passes through at least a portion of the thread of the thread, the groove intersecting a portion of the rib and the width of the groove is about the width of each rib 1.5-2.5 times.

In one embodiment, the groove extends continuously from the lowermost thread of the thread to the uppermost thread of the thread, the groove extending at an angle greater toward the head end than the angle of the thread extending toward the head end .

In another embodiment, the insertion end of the rod body is provided with a groove extending along the longitudinal axis from the insertion end toward the head end, the groove being continuous from the upper end of the groove Extending to the uppermost thread of the thread, the angle of the groove extending toward the head end is greater than the angle at which the thread extends toward the head end.

Other objects, advantages and features of the present invention will become apparent from

10‧‧‧ screws

12‧‧‧ rod body

14‧‧‧ thread

16‧‧‧ outside

18‧‧‧ head end

20‧‧‧Insert

22‧‧‧ hole

24‧‧‧ thread

26‧‧‧ ribs

28‧‧‧ trench

30‧‧‧ objects

32‧‧‧Scruff

34‧‧‧ slotting

36‧‧‧ side

X1‧‧‧ longitudinal axis

X2‧‧‧ horizontal axis

A1, A2‧‧‧ angle

H‧‧‧height

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a perspective view of a screw of a first embodiment of the present invention.

Figure 2a shows a front view of the screw of Figure 1.

Figure 2b shows a plan view of the screw of Figure 2a rotated 90 degrees.

Figure 2c shows a plan view of the screw of Figure 2a rotated 180 degrees.

Figure 2d shows a plan view of the screw of Figure 2a rotated 270 degrees.

Figure 3 is a cross-sectional view taken along line 3-3 of Figure 2d.

Figure 4 shows a schematic view of the screw of Figure 1 locked into an object.

Figure 5 is a perspective view of a screw of a second embodiment of the present invention.

Figure 6a shows a front view of the screw of Figure 5.

Figure 6b shows a plan view of the screw of Figure 6a rotated 90 degrees.

Figure 6c shows a plan view of the screw of Figure 6a rotated 180 degrees.

Figure 6d shows a plan view of the screw of Figure 6a rotated 270 degrees.

Figure 7 shows a schematic view of the screw of Figure 5 locked into an object.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT(S) 10. The screw 10 includes a shaft 12 and at least one thread 14 disposed on the shaft 12. The shaft 12 includes an outer periphery (root) 16 and a head end 18 and an insertion end 20 separated by a longitudinal axis (X1). The insertion end 20 forms a drill bit pattern. The outer diameter of the head end 18 is larger than the diameter of the shaft 12 and the upper surface of the head end 18 has a bore 22 for insertion by a driver (not shown).

The thread 14 is helically disposed on the outer periphery 16 of the shaft 12 and extends from the insertion end 20 toward the head end 18. The thread 14 is wound between the insertion end 20 and the head end 18 and includes The plurality of threads 24 have approximately equal pitches between adjacent two threads 24. A plurality of oblique ribs 26 are disposed between adjacent two threads 24, and the plurality of ribs 26 are disposed on the outer periphery 16 of the shaft 12 in parallel and each rib 26 faces the head end 18 The direction of extension is opposite to the direction in which the thread 14 extends toward the head end 18. In the present embodiment, the angle at which each of the ribs 26 extends toward the head end 18 is between 50 and 70 degrees with respect to a horizontal axis (X2), the horizontal axis (X2) being perpendicular to the longitudinal axis (X1) . Each of the ribs 26 has a rectangular shape (see FIG. 3) and a height (h) that is smaller than the tooth height of each of the screws 24.

The screw 10 further includes a continuously extending groove 28 that is helically formed at an outer periphery 16 of the shaft 12 and that continuously passes through at least a portion of the thread 24 of the thread 14. In the present embodiment, the groove 28 extends continuously from the lowermost thread 24 of the thread 14 to the uppermost thread 24 of the thread 14 (as shown in Figures 2a-2d). The direction in which the groove 28 extends toward the head end 18 is the same as the direction in which the thread 14 extends toward the head end 18 and intersects a portion of the rib 26 . In the present embodiment, the angle at which the groove 28 extends toward the head end 18 and the angle A2 of the horizontal axis (X2) is between 60 and 80 degrees (the angle at which the groove 28 extends toward the head end 18 is greater than the angle The angle at which the thread 14 extends toward the head end 18). Moreover, the groove 28 has a U-shaped cross section (see FIG. 3), and the recessed depth and width of the groove 28 are approximately 1.5-2.5 times the height (h) and width of each of the ribs 26. In a possible embodiment, the groove 28 has a V-shaped cross section.

The screw 10 constructed in accordance with the present invention, in practice, is locked into the article 30, such as a wooden board, with the insertion end 20 (see Figure 4). When the insertion end 20 of the screw 10 is screwed into the locked object 30, the thread 24 of the thread 14 will cut the object 30 to generate the debris 32; at the same time, the debris 32 can be disposed by the arrangement of the oblique rib 26 Guided upwards for chip removal, so that the resistance of the screw 10 in the locking direction is reduced, thereby increasing the screwing speed; furthermore, by the arrangement of the continuous groove 28, it can be used to provide the convexity The debris 32 extruded by the ribs 26 is accommodated so that the debris 32 does not accumulate in the upper portion of the screw 10, thereby making the locking operation of the screw 10 more labor-saving and quick, and the locked object 30 is not produced. rupture. In addition, the arrangement of the continuous groove 28 does not reduce the bonding force between the screw 10 and the object 30. Specifically, the angle at which the groove 28 extends upward and the angle A2 of the horizontal axis (X2) are 60-80. Between the degrees, the groove 28 formed on the entire outer periphery 16 of the rod 12 is only wound about 2 turns, and the width of the groove 28 is not large (about 1.5-2.5 times the width of the rib 26, Not only does the effect of accommodating the debris 32 is good, but the structural strength of the rod 12 is not adversely affected, and the thread 24 cannot be effectively engaged with the object 30, thereby detracting from the bonding ability of the screw 10.

Referring to Figures 5 through 7, there is shown a screw 10 constructed in accordance with a second embodiment of the present invention. In the present embodiment, the insertion end 20 of the shaft 12 is provided with a slot 34 along which the slot 34 is oriented. (X1) extending a length from the insertion end 20 toward the head end 18, and further, the groove 28 is spirally formed on the outer periphery 16 of the rod body 12 and continuously extends from the upper end of the slit 34 to The uppermost thread 24 of the thread 14 (shown in Figures 6a to 6d). As shown in FIG. 7, when the insertion end 20 of the screw 10 is screwed into the locked object 30, the thread 24 of the thread 14 and the two sides 36 of the slot 34 cut the object 30 to generate debris 32. At the same time, the slot 34 can be used to accommodate the debris 32 so that the thread 14 can be smoothly screwed into the article 30. Moreover, since the groove 28 communicates with the upper end of the slot 34 and extends to the uppermost thread 24 of the thread 14, the debris 32 received in the slot 34 can follow the groove 28 upwards. Extrusion does not accumulate in the upper portion of the screw 10, so that the screwing resistance of the screw 10 is lowered to prevent the object 30 from being cracked and to reduce the screwing torque to prevent the screw 10 from breaking.

The above description of the preferred embodiments of the present invention is not intended to limit the scope of the present invention, and the scope of the invention should be limited to the following claims. And the approximate structure should be included in the present invention.

10‧‧‧ screws

12‧‧‧ rod body

14‧‧‧ thread

16‧‧‧ outside

18‧‧‧ head end

20‧‧‧Insert

22‧‧‧ hole

24‧‧‧ thread

26‧‧‧ ribs

28‧‧‧ trench

Claims (5)

A screw comprising: a rod body comprising an outer circumference and a head end and an insertion end separated by a longitudinal axis; a thread spirally wound around the outer circumference of the rod body and comprising a plurality of threaded teeth a plurality of ribs disposed between adjacent two threads of the thread and spaced apart from the outer periphery of the rod; and a groove formed spirally around the outer periphery of the rod and Continuously passing through at least a portion of the thread of the thread, the groove intersecting a portion of the rib and having a width that is about 1.5-2.5 times the width of each rib. A screw according to the first aspect of the invention, wherein the groove extends continuously from a lowermost thread of the thread to an uppermost thread of the thread, the groove extending toward the head end by an angle greater than the thread facing the thread The angle at which the head end extends. The screw according to claim 1, wherein the insertion end of the rod body is provided with a groove extending along the longitudinal axis from the insertion end toward the head end, the groove being from the groove The upper end continuously extends to the uppermost thread of the thread, the groove extending at an angle toward the head end that is greater than an angle at which the thread extends toward the head end. A screw according to claim 2 or 3, wherein an angle at which each of the ribs extends toward the head end is between 50 and 70 degrees from a horizontal axis, the horizontal axis being perpendicular to the longitudinal axis, the groove being oriented The angle at which the head end extends is between 60 and 80 degrees from the horizontal axis. The screw of claim 2, wherein the direction in which each of the ribs extends toward the head end is opposite to the direction in which the thread extends toward the head end, and the height of each rib is smaller than the height of each thread; The direction in which the groove extends toward the head end is the same as the direction in which the thread extends toward the head end, and the groove has a recessed depth of about 1.5 to 2.5 times the height of each of the ribs.