TWI857681B - Screw - Google Patents

Abstract

A screw mainly includes a plurality of thread convolutions spirally disposed on a shank in a spiral direction, a groove and a slot region recessedly formed in the shank respectively. The groove extends annularly in the spiral direction and is situated between at least one upper thread flank and the slot region. The slot region has a plurality of slots extending axially from at least one lower thread flank to meet the groove. Accordingly, the groove and the slots are adapted to enlarge spaces for moving and accommodating chips, thereby attaining a quick removal of chips, reducing screwing resistance, and accelerating a screwing operation. The accumulation of remaining chips within the groove and the slots facilitates a tight engagement between the screw and a workpiece and attains an anti-loosening effect.

Description

Screws

The present invention relates to a screw structure, in particular to a screw which provides sufficient space for chip removal and chip accommodation to reduce locking resistance and increase bite force and locking property.

Referring to FIG. 1 and FIG. 2 , the conventional screw 1 includes a rod 11, and the rod 11 has two opposite ends forming a first end and a second end, a head 12 disposed at the first end of the rod 11, a tail 13 disposed at the second end of the rod 11, and a thread portion 14 spirally disposed on the rod 11, wherein the thread portion 14 extends in a spiral direction and has a plurality of threads 14A disposed between the first end and the second end. Each thread 14A has an upper tooth surface 141 facing the head 12, and a lower tooth surface 142 facing the tail 13 and connected to the upper tooth surface 141. When locking, the tail 13 is first positioned on the surface of an object 2, and then a rotational torque is applied to the head 12 so that the thread 14A can cut the object 2, thereby gradually driving the screw 1 downward into the object 2, so that the locking operation of the screw 1 can be completed.

However, after actual use, it was found that the space between the rod 11 and the threads 14A for chip accommodation and chip removal is insufficient, so that the chips generated by the threads 14A when rotary cutting the object 2 can only be slowly discharged outward along the narrow space between the threads 14A and the rod 11. However, not only does it cause the chip discharge speed to be too slow, but it also causes the locking resistance to increase, making it difficult for the screw 1 to be quickly locked into the object 2. If the chips are continuously squeezed, it is even more likely to cause the object 2 to crack. In addition, the insufficient chip accommodation space will also cause the bite force and locking property of the screw 1 after locking to be poor, causing the screw 1 to be easily loosened from the object 2, which really needs to be improved.

Therefore, the purpose of the present invention is to provide a screw that can provide sufficient space for chip accommodation and chip removal, not only reducing the locking resistance and increasing the locking speed, but also improving the bite force and locking property after locking.

Therefore, the screw of the present invention includes a rod body, a head and a tail portion respectively arranged at two ends of the rod body, and a thread portion spirally arranged on the rod body, wherein the thread portion is extended in a spiral direction and has a plurality of threads arranged on the rod body at intervals along an axial direction, so that the outer peripheral surface of the rod body defines a setting surface, each of the threads has an upper tooth surface and a lower tooth surface respectively extending outward from the rod body and facing opposite directions, a spiral ring groove and a receiving portion are concavely arranged on the setting surface, the spiral ring groove extends in the spiral direction and is located between at least one upper tooth surface and the receiving portion, and the receiving portion has a plurality of grooves extending in the axial direction, and the grooves extend from at least one lower tooth surface toward the spiral ring groove and are connected to the receiving portion. The spiral annular grooves are connected, so that when locking, the chip holding and chip removal space is greatly increased by the grooves and the spiral annular grooves, so that the generated chips can not only move outward along the spiral annular grooves and the screw teeth, but also enter the grooves from the spiral annular grooves and be quickly discharged outwards, which not only greatly reduces the generation of locking resistance, improves the locking speed, and avoids cracking of the material, but also, after locking, part of the chips can be accommodated in the grooves and the spiral annular grooves, which can increase the tightening force between the screw and the object, thereby improving the bite force and locking property after locking.

The other technical contents, features and effects of the present invention mentioned above will be clearly understood in the following detailed description of the preferred embodiment with reference to the drawings.

Referring to FIG. 3 and FIG. 4, the first preferred embodiment of the present invention, the screw 3 includes a rod 31 having a center line R, and the rod 31 has a first end and a second end formed at opposite ends, a head 32 disposed at the first end of the rod 31, a tail 33 disposed at the second end of the rod 31, a thread portion 34 spirally disposed on the rod 31, and a spiral ring groove 35 and a receiving portion 36 respectively recessed on the rod 31, the thread portion 34 extending along a spiral direction. The thread portion 34 has a plurality of threads 34A disposed between the first end and the second end. When adjacent threads 34A are spaced apart along an axial direction, the rod body 31 forms a setting surface 311 between the threads 34A on the outer peripheral surface, and the spiral annular groove 35 and the receiving portion 36 are recessed on the setting surface 311. In this embodiment, the spiral annular groove 35 is disposed between 5 and 6 threads 34A, and the receiving portion 36 is disposed between 4 and 5 threads 34A.

As mentioned above, each screw thread 34A has an upper tooth surface 341 facing the head portion 32 and a lower tooth surface 342 facing the tail portion 33, and the upper tooth surface 341 and the lower tooth surface 342 extend obliquely outward from the rod body 31 and connect with each other. In addition, the spiral annular groove 35 extends along the spiral direction of the screw thread portion 34 and is located between at least one upper tooth surface 341 and the accommodating portion 36. The accommodating portion 36 is arranged along the spiral direction of the screw thread portion 34. It has a plurality of grooves 361 extending along the axial direction, and the grooves 361 extend from at least one lower tooth surface 342 toward the spiral annular groove 35 and are connected to the spiral annular groove 35. In this embodiment, the extension direction of the grooves 361 is parallel to the center line R of the rod body 31, and the spiral annular groove 35 and the grooves 361 are arranged in an arc shape. In addition, the maximum depth 361D of the grooves 361 is different from the maximum depth 35D of the spiral annular groove 35, as shown in FIG. 4.

Referring to FIG. 3, FIG. 4 and FIG. 5, when the screw 3 is locked, the tail portion 33 is first positioned against the surface of an object 4, and then a rotational torque is applied to the head portion 32 so that the object 4 is cut downwardly through the tail portion 33 and the screw teeth 34A. At this time, the grooves 361 and the spiral grooves 35 are provided on the rod body 31, so that the generated chips can move outward along the screw teeth 34A. The spiral grooves 35 can increase the chip space, and at the same time, the chips can also enter the grooves 361 from the spiral grooves 35, which is more conducive to quickly removing a large amount of chips. The chips are discharged outward, which not only greatly reduces the generation of locking resistance, but also the screw 3 will not be hindered by the chips during the locking process and can be quickly screwed into the object 4, which can improve the locking speed. At the same time, it can also avoid the accumulation of chips and the squeezing that causes the object 4 to crack. Moreover, after the screw 3 is screwed into the object 4, part of the chips can be accommodated in the grooves 361 and the spiral annular groove 35, which can increase the tightening force between the screw 3 and the object 4, thereby strengthening the bite force and locking property after locking, and effectively avoiding the screw 3 from being loosened from the object 4.

Referring to FIG. 6 and FIG. 6A , the second preferred embodiment of the present invention still includes the components described in the first embodiment, and its purpose and function are the same as those of the first embodiment, which will not be described in detail here. The embodiment is particularly characterized in that the extending direction of the grooves 361 is inclined to the center line R of the rod 31, and the grooves 361 can be designed with different inclined directions according to actual use requirements. Therefore, when the extending direction of the grooves 361 is inclined with respect to the center line R, the chips are more likely to enter the spiral annular groove 35 and the grooves 361 as the screw 3 is rotated, so that the chips can be discharged quickly and smoothly. At the same time, the grooves 361 and the spiral annular groove 35 can also accommodate the chips in time, so that the bite force and locking property of the screw 3 after locking are better.

To summarize the above, the screw of the present invention is provided with the spiral annular groove and the accommodating portion through the setting surface of the rod body, the spiral annular groove is located between at least one upper tooth surface and the accommodating portion, and is extended and recessed along the spiral direction of the threaded portion, and the groove of the accommodating portion extends axially from at least one lower tooth surface toward the spiral annular groove, so that the grooves are connected with the spiral annular groove. In addition to greatly increasing the chip removal and chip accommodation space, the generated chips can also be quickly discharged to the outside, which is more conducive to reducing the locking resistance and improving the locking speed. At the same time, after locking, it can also provide appropriate chip accommodation, thereby increasing the bite force and locking tightness after locking, so that the screw is not easy to loosen.

However, the above is only to illustrate the preferred embodiment of the present invention, and should not be used to limit the scope of implementation of the present invention. In other words, all simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the content of the invention specification should still fall within the scope of the patent of the present invention.

(Learning)

1: Screw

11: Rod

12: Head

13: Tail

14: Screw thread

14A: Screw thread

141: Upper tooth surface

142: Lower tooth surface

2: Objects

(The present invention)

3: Screws

31: Rod

32: Head

33: Tail

34: Screw thread

35: Spiral ring groove

36: Accommodation

311: Setting surface

34A: Screw thread

341: Upper tooth surface

342: Lower tooth surface

361: Groove

35D: Maximum depth of spiral groove

361D: Maximum depth of groove

R: Centerline

4: Objects

Figure 1 is a schematic diagram of a common screw.

Figure 2 is a diagram showing the usage of the familiar screw.

Figure 3 is a three-dimensional diagram of the first preferred embodiment of the present invention.

Figure 4 is a cross-sectional view of a local component of the first preferred embodiment.

Figure 5 is a schematic diagram of the usage status of the first preferred embodiment.

Figure 6 is a three-dimensional diagram of the second preferred embodiment of the present invention.

Figure 6A is an enlarged view of Figure 6.

3: Screws

31: Rod

32: Head

33: Tail

34: Screw thread part

35: Spiral ring groove

36: Accommodation section

311: Setting surface

34A: Screw thread

341: Upper tooth surface

342: Lower tooth surface

361: Groove

R: Centerline

Claims (6)

A screw comprises a rod, a first end and a second end formed at opposite ends of the rod, a head portion arranged at the first end, a tail portion arranged at the second end, and a thread portion of the rod arranged in a spiral ring, wherein the thread portion is arranged along a spiral direction and has a plurality of threads arranged between the first end and the second end, and each thread has an upper thread surface facing the head portion and a lower thread surface facing the tail portion; the screw is characterized in that: when adjacent threads are arranged at intervals along an axial direction, the rod The body forms a setting surface on the outer circumference, and a spiral annular groove and a receiving portion are concavely provided on the setting surface, and the spiral annular groove extends along the spiral direction of the thread portion and is located between at least one upper tooth surface and the receiving portion. The spiral annular groove is arranged in an arc shape, and the receiving portion is arranged along the spiral direction of the thread portion and has a plurality of grooves, which extend along the axis direction and from at least one lower tooth surface toward the spiral annular groove and are connected to the spiral annular groove. In addition, the grooves and the spiral annular groove have different depths. According to the screw described in claim 1, the spiral annular groove is provided between some of the thread teeth. According to the screw described in claim 1, the grooves are provided between some of the thread threads. According to the screw described in claim 1, the rod defines a center line, and the extension direction of the grooves is parallel to the center line. According to the screw described in claim 1, the rod defines a center line, and the extension direction of the grooves is inclined to the center line. According to the screw described in claim 1, the grooves are arranged in an arc shape.

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