TWI567304B - Screw structure having a guiding tooth - Google Patents

Description

Screw structure with guiding screw

The present invention relates to a screw structure having a guide screw; and more particularly to a screw structure for guiding a thread on a screw.

Figure 1 discloses a side view of a conventional screw construction. Referring to Fig. 1, the conventional screw structure has a screw outer surface and a thread. The thread extends around the outer surface of the screw for screwing to a screw hole or a nut. In general, the thread has a uniform thread height and a uniform thread width, and the thread has a conical section, and the angle of the angle [or angle of the angle] is about 60°. .

Since the screw height, the thread width and the thread profile of the conventional screw are often the same, in the screw locking, the screw may break the screw hole or the nut hole when the screw is misaligned. Inside the thread. Moreover, the tapered section of the conventional screw is also more likely to damage the internal thread of the screw hole or the nut hole.

Another threaded screw structure of the conventional screw, such as the new patent of the anti-loose mechanical screw 中 of the Republic of China Patent Publication No. M404902, discloses a anti-loose mechanical screw, which includes a cap head and a cap head The screw protruding from the side is provided with an external thread on the screw, and the two sides of the plurality of screw threads of the external thread are asymmetric external threads for forming different inclination angles, and the two sides of the plurality of spiral peaks of the external thread are formed into different sizes. Angle, the angle of the two sides of the complex thread of the external thread may be between 40° and 49° (may also be 51° to 60°), the preferred embodiment is α°, and the other side is preferably β°=[40°～49°]-α°, and can be designed for α°>β°, for the asymmetrical external thread to be formed on the screw, when the screw is locked to the nut, the external thread and the screw are increased. The purpose of friction and occlusion area between the internal threads of the cap is not easy to loosen and detach.

Another threaded screw structure of the conventional screw, such as the improved structure of the screw thread of the screw of the Republic of China Patent No. 475670, discloses a screw thread improved structure, mainly comprising a screw head, a screw body and a dense a plurality of twill threads of the screw body, wherein one of the screws spaced apart from the screw head is a wave-shaped wave, so that when the screw is locked, the screw is made by the wavy screw It can be made stronger to prevent loosening and falling off after the lock.

However, the screw No. M404902 and the threaded structure of the screw of No. 475670 have a tapered cross section, and the main function is to make the screw lock. The combination is more firm and not easy to loosen. However, when the lock is engaged in the unpositioned state, the thread wear or the misalignment of the thread is still prone to occur, and it is difficult to smoothly lock, even if the screw is stuck and the screw hole is broken or The screw hole is inside the nut hole, so it is necessary to further improve the thread structure to improve the disadvantage of the screw misalignment.

In view of the above, in order to meet the above requirements, the present invention provides a screw structure with a guiding screw, which is guided by a guiding screw to lock a screw hole, and then guides a main screw into the screw. Holes, to avoid the misalignment of the threaded teeth, resulting in failure or failure of the lock, and to improve the reliability of the screw lock cooperation.

The main object of the present invention is to provide a screw structure with a guiding screw, which is firstly guided to lock a screw hole by a guiding screw, and then a main screw guide is locked into the screw hole to avoid the screw. The misalignment of the teeth causes the lock to fail or break, thereby improving the reliability of the screw lock cooperation industry.

In order to achieve the above object, the screw structure of the guiding screw of the present invention comprises: a main body having a first end, a second end and an end; a screw head disposed at the first end of the main body a screw rod body disposed at the second end of the main body; a main thread extending on the screw rod body; and a guiding screw extending to the screw rod body, the guiding thread The main thread is connected to the main thread, and the guiding screw is located at the end; wherein the guiding screw is first guided to lock into a screw hole, and the main thread guiding is locked into the screw hole.

In the preferred embodiment of the invention, the guiding screw has a circular arc section.

In the preferred embodiment of the present invention, the guiding screw has a screw height and a thread width, and the screw height and the thread width are the same.

In the preferred embodiment of the present invention, the guiding screw has a thread pitch, and the screw pitch is equidistant or unequal.

In the preferred embodiment of the present invention, the guiding screw has a screw height, and the screw height gradually increases along the direction from the second end to the first end.

In the preferred embodiment of the present invention, the guiding screw has a thread width, and the thread width gradually increases along the direction from the second end to the first end.

In a preferred embodiment of the invention, the main thread has an angular angle of between 20 and 80 degrees.

In the preferred embodiment of the invention, the main screw and the guiding screw are made of different materials.

In the preferred embodiment of the present invention, the material hardness of the main thread is greater than or less than the material hardness of the guiding screw.

In the preferred embodiment of the present invention, the end portion has a DOG POINT, the length of the dog tail is 1/2 or more of the rod diameter, and the front end of the dog tail is an R angle.

In order to fully understand the present invention, the preferred embodiments of the present invention are described in detail below and are not intended to limit the invention.

The screw structure of the guiding screw of the preferred embodiment of the present invention is applicable to various screw structures, such as: mechanical screws, iron plate screws, self-tapping screws, triangular screws, stainless steel screws, Phillips screws, wood screws, electronic screws and special Screws, but are not intended to limit the scope of the invention.

The screw structure of the guiding screw of the preferred embodiment of the present invention is applicable to various production standards, such as: international standard [ISO], American [ANSI], Japanese [JIS], German [DIN], Imperial [BSW] The screws produced are not intended to limit the scope of the invention.

Fig. 2 is a side elevational view showing the screw structure of the guide screw according to the first preferred embodiment of the present invention, which is a side view of the conventional screw structure of Fig. 1. Referring to FIG. 2, the screw structure of the first embodiment of the present invention mainly comprises a main body 1, a screw head 11, a screw body 12 and an end portion 13. The main body 1 has a first end, a second end and an end. The screw head 11 is disposed at the first end of the main body 1. The screw body 12 is disposed at the second end of the main body 1.

Referring to FIG. 2 again, the screw head 11 can be a flat head [Flat], an oval head [Oval], a round head [Round], a round flat head [Pan], a large round flat head [Truss], a hexagon. Head [Hex] and other shapes or headless screws, but are not intended to limit the scope of the invention.

Referring to FIG. 2 again, the screw structure of the first embodiment of the present invention further includes a main screw 121 and a guiding screw 131, and the screw height of the main screw 121 is greater than the guiding screw 131. The height of the thread. The main thread 121 is on the screw body 12, and the main thread 121 has an angular angle α between 20° and 80°. The guiding screw 131 extends to the screw body 12 , the guiding screw 131 is connected to the main screw 121 , and the guiding screw 131 is located at the end 13 .

Referring again to FIG. 2, the screw head 11 is coupled to the screw shaft 12 on the main body 1, and the screw shaft 12 is coupled to the end portion 13. When the screw-locking cooperation is performed, the guiding screw 131 is first guided into a screw hole (not shown), and the main screw 121 is locked into the screw hole to prevent the main thread 121 from directly Lock into the screw hole. Since the height of the thread of the guiding screw 131 is smaller than the height of the thread of the main thread 121, the height of the thread of the guiding thread 131 is easy to be caught in the thread of the screw hole, so as to displace the thread of the thread. Guide to the correct screw engagement.

Referring to FIG. 2 again, the main thread 121 of the screw body 12 is located on an outer surface of a screw. The main thread 121 has a first inclined surface 12a and a second inclined surface 12b. The first inclined surface The 12a and the second inclined faces 12b form a tapered section [not shown]. The tapered section [not shown] has an angular angle α which is between 20° and 80°.

Referring to FIG. 2 again, the guiding screw 131 of the first preferred embodiment of the present invention has a circular arc section [not labeled], so that the circular section [not labeled] is easy to use the main section. The thread 121 and the guiding screw 131 are guided to the correct threading engagement state. In the first preferred embodiment of the present invention, the guiding screw 131 has a screw height and a thread width, and the screw height and the thread width are the same. In addition, the guiding screw 131 has a screw pitch, and the screw pitch is equidistant or unequal.

In addition, the main screw 121 and the guiding screw 131 of the first preferred embodiment of the present invention may be selected from different materials. If the main thread 121 and the guiding screw 131 are selected from different materials, the material hardness of the main thread 121 is greater than or less than the material hardness of the guiding thread 131.

Fig. 3 is a side elevational view showing the screw structure of the guide screw according to the second preferred embodiment of the present invention, which corresponds to the side view of Fig. 2. Referring to FIG. 3, with respect to the first embodiment, the height of the thread of the guiding screw 131 of the second embodiment gradually increases along the direction from the second end to the first end, as in the third embodiment. The two dotted lines of the figure are shown. For example, the guiding screw 131 has three kinds of screw heights in the section along the direction from the second end to the first end.

Fig. 4 is a side elevational view showing the screw structure of the guide screw according to the third preferred embodiment of the present invention, which corresponds to the side views of Figs. 2 and 3. Referring to FIG. 4, with respect to the first and second embodiments, the thread width of the guiding screw 131 of the third embodiment gradually increases along the direction from the second end to the first end. For example, the guiding screw 131 has three kinds of thread widths in the section along the direction from the second end to the first end, that is, W1>W2>W3.

Fig. 5 is a side elevational view showing the screw structure of the guide screw according to the fourth preferred embodiment of the present invention, which corresponds to the side views of Figs. 2, 3 and 4. Referring to FIG. 5, with respect to the first to third embodiments, the end portion 13 of the fourth embodiment has a dog tail 132 having a length of 1/2 or more of the rod diameter and the dog tail. The front end of 132 is the R angle [not labeled].

The foregoing preferred embodiments are merely illustrative of the invention and the technical features thereof, and the techniques of the embodiments can be carried out with various substantial equivalent modifications and/or alternatives; therefore, the scope of the invention is subject to the appended claims. The scope defined by the scope shall prevail.

1. . . main body

11. . . Screw head

12. . . Screw rod body

12a. . . First inclined surface

12b. . . Second inclined surface

121. . . Main thread

α. . . Angle of the teeth

13. . . Ends

131. . . Guide thread

132. . . Dog tail

W1. . . First guiding thread

W2. . . Second guiding thread

W3. . . Third guiding thread

Figure 1: Side view of a conventional screw construction.

Fig. 2 is a side view showing the screw structure of the guide screw according to the first preferred embodiment of the present invention.

Fig. 3 is a side view showing the screw structure of the guide screw according to the second preferred embodiment of the present invention.

Fig. 4 is a side view showing the screw structure of the guide screw according to the third preferred embodiment of the present invention.

Fig. 5 is a side view showing the screw structure of the guide screw according to the fourth preferred embodiment of the present invention.

1. . . main body

11. . . Screw head

12. . . Screw rod body

12a. . . First inclined surface

12b. . . Second inclined surface

121. . . Main thread

α. . . Angle of the teeth

13. . . Ends

131. . . Guide thread

Claims (10)

A screw structure with a guiding screw, comprising: a body having a first end, a second end and an end; a screw head disposed at the first end of the body; a screw body Provided at a second end of the main body; a main screw extending on the screw body; and a guiding screw extending to the screw body, the guiding screw being connected to the main screw a tooth, and the guiding screw is located at the end; wherein the guiding screw is first guided into a screw hole, and the main thread is guided into the screw hole, the guiding screw has a a thread width, and the thread width gradually increases in a direction from the second end toward the first end. The screw structure of the guiding screw according to the first aspect of the patent application, wherein the main body is made of a mechanical screw, an iron plate screw, a self-tapping screw, a triangular screw, a stainless steel screw, a Phillips screw, A wood screw or an electronic screw. The screw structure of the guide screw according to the first aspect of the patent application, wherein the guide screw has a screw height. The screw structure of the guiding screw according to the first aspect of the patent application, wherein the guiding screw has a screw pitch, and the screw pitch is equidistant. The screw structure of the guide screw according to the first aspect of the patent application, wherein the guide screw has a screw pitch, and the pitch of the screw is unequal. The screw structure of the guiding screw according to the first aspect of the patent application, wherein the main thread has an angular angle of between 20° and 80°. The screw structure of the guide screw according to the first aspect of the patent application, wherein the main screw and the guide screw are made of different materials. The screw structure of the guide screw according to the first aspect of the patent application, wherein the material hardness of the main screw is greater than the material hardness of the guide screw. The screw structure of the guide screw according to the first aspect of the patent application, wherein the material hardness of the main screw is smaller than the material hardness of the guide screw. The screw structure with a guiding screw according to the first aspect of the patent application, wherein the end portion has a dog tail, the length of the dog tail is 1/2 or more of the rod diameter, and the dog tail The front end is the R angle.