TWI846214B - Screws - Google Patents

Abstract

The present invention provides a screw, comprising a rod and a threaded portion, wherein the threaded portion surrounds the outer peripheral surface of the rod in a spiral protrusion manner, and at least a part of the threaded portion has a left-hand thread and a right-hand thread. The left-biased thread has a left ridge, the right-biased thread has a right ridge, the thread portion has a normal ridge, the left ridge of the left-biased thread is on the left side of the imaginary line of the normal ridge of the thread portion, the right ridge of the right-biased thread is on the right side of the imaginary line of the normal ridge of the thread portion, the front end of the right-biased thread has a right shoulder, and the front end of the left-biased thread has a left shoulder. The left shoulder of the left-biased thread of the thread portion and the right shoulder of the right-biased thread are used to open the inside of the workpiece, so that the screw can be more labor-saving when screwing into the workpiece, and impurities can be excluded, which can solve the problem of the screw being blocked during the process of locking into the workpiece and damaging the workpiece and the screw.

Description

Screws

The present invention relates to screws, and in particular to a chip-removing and labor-saving screw.

When the screw is locked into the workpiece, the surface of the screw body and the surface of the thread both move forward against the workpiece, so friction is generated between the surface of the screw body and the thread and the workpiece, causing effort. The friction between the thread and the workpiece is the main factor causing effort.

In addition, if there are impurities, foreign objects or paint in the internal screw hole of a general workpiece, the screw will be blocked from moving forward when it is screwed into the internal screw hole, and may even get stuck in the internal screw hole, resulting in a dilemma where it cannot move forward or backward. Or excessive force may cause the screw to break or even damage the workpiece, resulting in loss of materials and objects, personnel safety, and inconvenience in operation.

The present invention provides a screw, comprising a rod body, a threaded portion, the threaded portion is spirally protruding around the outer circumference of the rod body, at least a portion of the threaded portion has a left-biased thread and a right-biased thread. The left-biased thread has a left ridge, the right-biased thread has a right ridge, the threaded portion has a normal ridge, the left ridge of the left-biased thread is on the left side of the normal ridge imaginary line of the threaded portion, the right ridge of the right-biased thread is on the right side of the normal ridge imaginary line of the threaded portion, the front end of the right-biased thread has a right shoulder in the radial direction of the rod body, and the front end of the left-biased thread has a left shoulder in the radial direction of the rod body.

In one embodiment, the screw further includes a middle thread having a middle ridge, the middle thread being between the left-biased thread and the right-biased thread to connect the left-biased thread and the right-biased thread, and the middle ridge and the normal ridge are on the same thread line.

In one embodiment, the threaded portion includes a normal thread, the normal thread has the normal ridge, the normal thread has a drop in the axial position at the connection with the right-hand thread, and a shoulder is formed in the radial direction of the rod, and the normal thread has a drop in the axial position at the connection with the left-hand thread, and a shoulder is formed in the radial direction of the rod.

Beneficial effects of the screw of the present invention: 1. The screw of the present invention can push the workpiece apart when locking into the workpiece by means of the left-handed and right-handed threads of the threaded part, so that there is a gap between the normal threads at the rear and the workpiece, making it easier for the screw to lock into the workpiece. 2. When the screw of the present invention is locked into the inner hole of a workpiece with impurities, foreign matter or paint, the impurities, foreign matter or paint in the inner hole can be scraped or removed by means of the left-handed and right-handed threads, so that the screw will not be stuck in the inner screw hole of the workpiece. The operation and use are very convenient, and it not only protects the screw but also the workpiece.

In the following embodiments of the present invention, the same or similar components are numbered the same to simplify the description and facilitate reading and understanding. In order to enable the examiner to have a further understanding of the features and characteristics of the present invention, the following preferred embodiments are listed and illustrated with the accompanying drawings as follows:

As shown in FIGS. 1 to 4 , the present invention provides a screw 100 including a rod 10 and a threaded portion 20. The threaded portion 20 surrounds the outer circumference of the rod 10 in a spiral protrusion manner. At least a portion of the threaded portion 20 has a left-biased thread 21 and a right-biased thread 22, and the rest is a normal thread 23. Please refer to FIG. 3 to unfold the threaded portion 20 and view it from above. The left-biased thread 21 has a left ridge 211, the right-biased thread 22 has a right ridge 221, and the normal thread 23 of the threaded portion 20 has a normal ridge 231. In addition, there is an imaginary line 232 extending from the normal ridge 231 at the positions of the left-biased thread 21 and the right-biased thread 22. The imaginary line 232 and the normal ridge 231 are connected. On the same thread line, FIG. 3 shows that on the same straight line, the left ridge 211 of the left-biased thread 21 is on the left side of the imaginary line 232 of the normal ridge 231 of the normal thread 23, and the right ridge 221 of the right-biased thread 22 is on the right side of the imaginary line 232 of the normal ridge 231 of the normal thread 23. The front end of the right-biased thread 22 has a right shoulder 222, and the front end of the left-biased thread 21 has a left shoulder 212.

As shown in FIG. 3 , in one embodiment, the threaded portion 20 is connected to the right-hand thread 22 by the normal thread 23 near the tip 30 (left side of FIG. 3 ), and then the right-hand thread 22 is connected to the left-hand thread 21, and then the left-hand thread 21 is connected to the right-hand thread 22, and the right-hand thread 22 and the left-hand thread 21 are repeatedly connected in an alternating manner (right, left, left, right, etc.). ) is wrapped around the outer peripheral surface of the rod body 10 from the screw tip 30 to the screw head 40. FIG. 4 shows that in this embodiment, one thread pitch has four left-biased threads 21 and four right-biased threads 22. As shown in FIG. 3, when the normal thread 23 on the left side of FIG. 3 is connected to the right-biased thread 22, the right spine 221 of the right-biased thread 22 is in the normal position. The normal ridge 231 of the thread 23 is on the right side of the imaginary line 232, so that the normal thread 23 and the right-biased thread 22 have a drop in the axial position at the connection, and a right shoulder 222 is formed in the radial direction of the rod 10. When the right-biased thread 22 is connected to the left-biased thread 21, the left ridge 211 of the left-biased thread 21 is on the normal ridge of the normal thread 23. 231 is on the left side of the imaginary line 232, so that the axial position of the left-handed thread 21 and the right-handed thread 22 at the connection has a drop, and a left shoulder 212 is formed in the radial direction of the rod 10. When the left-handed thread 21 is connected to the next right-handed thread 22, a right shoulder 222 is formed in the radial direction of the rod 10, forming a right-left-left staggered arrangement. Finally, the axial position of the connection between the normal thread 23 and the left-handed thread 21 also has a drop, and a right shoulder 222 is formed in the radial direction of the rod 10 (see Figure 3). Therefore, the connection between the front and rear normal threads 23 and the left-handed thread 21 or the right-handed thread 22 also has a shoulder.

In another embodiment, the threaded portion 20 near the tip 30 starts with a normal thread 23 connected to a left-hand thread 21 (different from the right-hand thread 22 in the previous embodiment), and then the left-hand thread 21 is connected to the right-hand thread 22, and it continues to surround the outer circumference of the rod 10 in a staggered manner. This part is opposite to the previous embodiment in direction, and other features are the same, so it will not be illustrated again.

The above is an introduction to the various components and features of a screw 100 provided by a preferred embodiment of the present invention, and then its usage characteristics are described as follows: Please refer to Figure 5. When the screw 100 of the present invention is locked into a workpiece 90, the left shoulder 212 of the left-biased thread 21 and the right shoulder 222 of the right-biased thread 22 can push the workpiece 90 apart, so that there is a slight gap G between the workpiece 90 and the normal thread 23 of the screw 100, and the normal thread 23 of the screw 100 will not fit too tightly with the workpiece 90 to cause a very large friction force, so that the screw can be more labor-saving when screwing into the workpiece, and when screwing into a workpiece with a softer texture or easily broken, such as a gypsum board, asbestos board, etc., it can also better maintain the integrity of the workpiece without damaging the workpiece. In addition, when the screw 100 of the present invention is locked into the workpiece 90, the left shoulder 212 and the right shoulder 222 function as scrapers to remove impurities generated during the process of screwing in or out of the inner screw hole, such as wood chips, paint, and iron chips.

Please refer to FIG. 6 and FIG. 7, which are another embodiment of the screw 200 of the present invention. It also has a rod 10, a threaded portion 20, and the threaded portion 20 has a normal thread 23, a left-biased thread 21, and a right-biased thread 22. These features can be referred to the previous embodiment, and will not be repeated. The difference is that there is a middle thread 24 between the left-biased thread 21 and the right-biased thread 22 to connect the left-biased thread 21 and the right-biased thread 22, and the middle thread 24 has a middle ridge 241, and the middle ridge 241 is connected to the normal ridge. 231 are on the same thread line, that is, the middle thread 24 and the normal thread 23 are on the same thread line. The threaded portion 20 is connected to the right-hand thread 22 by the normal thread 23 near the tip 30, and then connected to the middle thread 24 by the right-hand thread 22. The middle thread 24 is then connected to the left-hand thread 21. The right-hand thread 22, the middle thread 24 and the left-hand thread 21 are repeatedly connected (right-center-left-center-right-center-left) around the outer circumference of the rod 10 from the screw tip 30 to the screw head 40. The normal thread 23 is connected to the right-hand thread 22. When the right-handed thread 22 is connected to the middle thread 24, the right ridge 221 of the right-handed thread 22 is on the right side of the imaginary line 232 of the normal ridge 231 of the normal thread 23, so that the normal thread 23 and the right-handed thread 22 have a drop in the axial position at the connection, and a right shoulder 222 is formed in the radial direction of the rod 10. When the right-handed thread 22 is connected to the middle thread 24, the right ridge 221 of the right-handed thread 22 is on the right side of the middle ridge 241, so that the middle thread 24 and the right-handed thread 22 have a drop in the axial position at the connection, and the rod 1 0, a left shoulder 212 is formed in the radial direction of the rod 10, and the left ridge 211 of the left-biased thread 21 is on the left side of the middle ridge 241, so that the axial position of the left-biased thread 21 and the middle thread 24 at the connection has a step, and a left shoulder 212 is formed in the radial direction of the rod 10. When the left-biased thread 21 is connected to the next middle thread 24, a right shoulder 222 is formed in the radial direction of the rod 10 to form a staggered arrangement. This embodiment also has the effect of the previous embodiment, and its use and operation refer to the previous embodiment and will not be described in detail.

The above disclosure is only the preferred embodiment provided by the present invention and is not intended to limit the scope of implementation of the present invention. All equivalent changes made by relevant technical personnel in the technical field based on the present invention should fall within the scope covered by the present invention.

100: Screw 10: Rod 20: Threaded part 21: Left-handed thread 22: Right-handed thread 23: Normal thread 211: Left spine 221: Right spine 231: Normal spine 232: Imaginary line 222: Right shoulder 212: Left shoulder 30: Tip 90: Workpiece G: Gap 200: Screw 24: Middle thread 241: Middle spine 40: Head

FIG. 1 is a three-dimensional diagram of an embodiment of the screw of the present invention. FIG. 2 is a front view of FIG. 1. FIG. 3 is a schematic diagram of a part of FIG. 1 and FIG. 2 of the present invention. FIG. 4 is a 4-4 cross-sectional line diagram of FIG. 2. FIG. 5 is a schematic diagram of the operation of the screw in FIG. 2. FIG. 6 is a front view of another embodiment of the screw of the present invention. FIG. 7 is a schematic diagram of a part of FIG. 6.

100: Screws

10: Rod

20: Threaded part

21: Left-hand thread

22: Right-hand thread

23: Normal thread

30: Tip

40: Head

222: Right shoulder

212: Left shoulder

Claims (9)

A screw comprises: a rod and a threaded portion, the threaded portion is spirally protruding around the outer circumference of the rod, the threaded portion has a left-biased thread, a right-biased thread and a normal thread, the left-biased thread has a left ridge, the right-biased thread has a right ridge, the normal thread has a normal ridge, the left ridge of the left-biased thread is on the left side of an imaginary line extending from the normal ridge of the threaded portion, and the right-biased thread is on the left side of an imaginary line extending from the normal ridge of the threaded portion. The right ridge of the thread is on the right side of the imaginary line extending from the normal ridge of the thread portion. The front end of the right-biased thread has a right shoulder, and the front end of the left-biased thread has a left shoulder. The axial position of the connection between the normal thread and the right-biased thread has a drop, and a shoulder is formed in the radial direction of the rod. The axial position of the connection between the normal thread and the left-biased thread has a drop, and a shoulder is formed in the radial direction of the rod. The screw as described in item 1 of the patent application, wherein the right shoulder is in the radial direction of the rod. The screw as described in item 1 of the patent application, wherein the left shoulder is in the radial direction of the rod. The screw as described in item 1 of the patent application, wherein the left-hand thread and the right-hand thread are connected together. The screw as described in item 1 of the patent application scope, wherein there are 4 left-hand threads and 4 right-hand threads in one thread pitch, and the left-hand threads and the right-hand threads are connected together in an alternating manner. The screw as described in item 1 of the patent application scope further includes a middle thread, the middle thread has a middle ridge, and the middle thread is between the left-hand thread and the right-hand thread to connect the left-hand thread and the right-hand thread. The screw as described in item 6 of the patent application, wherein the middle ridge and the normal ridge are on the same thread line. A screw comprises: a rod and a threaded portion, the threaded portion is spirally protruding around the outer circumference of the rod, at least a portion of the threaded portion has a left-hand thread, a right-hand thread and a middle thread, the middle thread has a middle ridge, the middle thread is between the left-hand thread and the right-hand thread to connect the left-hand thread and the right-hand thread, the left-hand thread The offset thread has a left ridge, the right offset thread has a right ridge, the thread portion has a normal ridge, the left ridge of the left offset thread is on the left side of the imaginary line extending from the normal ridge of the thread portion, the right ridge of the right offset thread is on the right side of the imaginary line extending from the normal ridge of the thread portion, the front end of the right offset thread has a right shoulder, and the front end of the left offset thread has a left shoulder. The screw as described in Item 8 of the patent application, wherein the middle ridge and the normal ridge are on the same thread line.

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