High torque transmission screw and fastening tool therefor

Abstract

To provide a high torque transmission screw which is hardly slipped by suppressing abrasion.SOLUTION: A high torque transmission screw includes a head part 11 formed in a columnar shape and a bolt part 12 in which a thread 121 is formed on a surface thereof. A cross section of a columnar drive projection 112 on the head part 11 includes: four drive parts 113 aligned in an annular manner at the same angle interval and in a manner of being apart from each other; and four guide parts 114 extending straight and connecting the drive parts 113. Each of the drive parts 113 includes: an arc surface section 115 extending in an arc shape; and two plane sections 116 extending linearly respectively from both ends of the arc surface section 115 to one guide part 114. A center angle of the arc surface section 115 is less than 180 degrees. The longest distance between any of the two drive parts 113 that are not adjacent to each other is longer than 1.16 times of the longest distance between the adjacent two drive parts 113.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a screw and a tool for driving the screw, and more particularly to a high torque transmission screw and a tightening tool for the screw. [Background technology]

[0002] For example, as shown in Patent Document 1, a typical flanged hexagonal bolt has a flange that functions as a washer, and a head with a hexagonal cross section that is operated with a wrench (tightening tool). However, when the six pointed ends of the hexagonal column become rounded due to long-term wear, the torque transmission effect decreases, and the wrench that operates it is more likely to slip off the bolt. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Taiwan Patent Application Publication No. 200414947 Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide a screw which is less susceptible to wear and slippage. [Means for solving the problem]

[0005] Therefore, the high torque transmission screw of the present invention comprises a head portion formed in a columnar shape and a bolt portion extending from one end of the head portion and having at least one thread formed on a surface thereof, The cross-sectional shape of the columnar driving projection at the other end opposite to the one end of the head portion has four driving portions arranged in a ring shape at equal angular intervals and spaced apart from each other, and four guide portions extending straight and connecting each of the driving portions; Each of the drive portions has an arcuate surface section extending in an arc shape, and two flat sections extending linearly from both ends of the arcuate surface section to one of the guide portions, and the central angle of the arcuate surface section is less than 180 degrees; The longest distance between any two of the drive parts that are not adjacent to each other is longer than 1.16 times the longest distance between two of the drive parts that are adjacent to each other.

[0006] Another object of the present invention is to provide a tightening tool for driving the high torque transmission screw.

[0007] Therefore, the fastening tool of the present invention has a body having a passive hole formed to be capable of receiving the driving projection of the head portion of the high torque transmission screw, and the cross-sectional shape of the passive hole has four driving portions arranged in a ring shape at equal angular intervals and spaced apart from each other, and four guide portions extending straight and connecting each of the driving portions, Each of the drive portions has an arcuate surface section extending in an arc shape, and two flat sections extending linearly from both ends of the arcuate surface section to one of the guide portions, and the central angle of the arcuate surface section is less than 180 degrees; The longest distance between any two of the drive parts that are not adjacent to each other is longer than 1.16 times the longest distance between two of the drive parts that are adjacent to each other. Effect of the Invention

[0008] In the present invention, the longest distance between any two non-adjacent driving parts is longer than 1.16 times the longest distance between two adjacent driving parts, which is greater than the equivalent ratio of 1.1547 in a regular hexagon. Therefore, the occurrence rate of slippage of the tightening tool (or wrench) of the present invention against the high torque transmission screw of the present invention can be significantly reduced, and the arcuate contour of the arcuate surface section can maintain good torque transmission while avoiding wear during operation. The presence of the flat section increases the area of ​​contact between the tightening tool and the high torque transmission screw, thereby improving the meshing and stability between the tightening tool and the high torque transmission screw and countering torque transmission loss due to dimensional tolerances. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a perspective view showing a first embodiment of a high torque transmission screw of the present invention. [Diagram 2] FIG. 2 is a top view showing the shape of the head portion of the high torque transmission screw of the first embodiment. [Diagram 3] 3 is a top view showing the shape of a driving protrusion of the head portion shown in FIG. 2. FIG. [Figure 4] FIG. 11 is a perspective view showing a modification of the first embodiment. [Diagram 5] FIG. 11 is a perspective view showing a modification of the first embodiment. [Figure 6] 1 is a top view showing a second embodiment of the high torque transmission screw of the present invention in which an engagement hole is formed. FIG. [Figure 7] 13A to 13C are top views showing examples of changes in the shape of the engagement hole. [Figure 8] 13A to 13C are top views showing examples of changes in the shape of the engagement hole. [Figure 9] 13A to 13C are top views showing examples of changes in the shape of the engagement hole. [Figure 10] 13A to 13C are top views showing examples of changes in the shape of the engagement hole. [Figure 11] 13A to 13C are top views showing examples of changes in the shape of the engagement hole. [Figure 12]10 is an explanatory diagram showing a state in which a normal driver bit is inserted into an engagement hole of a second embodiment of the high torque transmission screw of the present invention. FIG. [Figure 13] FIG. 1 is a perspective view showing the high torque transmission screw of the present invention and the tightening tool of the present invention. [Figure 14] 1 is a top view showing a passive hole formed in the tightening tool of the present invention. FIG. [Figure 15] FIG. 2 is a perspective view showing how the high torque transmission screw of the present invention is operated with a normal wrench. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, various embodiments of the high torque transmission screw and the tightening tool thereof of the present invention will be described in detail with reference to the drawings.

[0011] Figures 1 to 3 show a first embodiment of the high torque transmission screw of the present invention, and as shown, this high torque transmission screw 1 has a head portion 11 formed in a columnar shape, and a bolt portion 12 extending downward from the lower end of the head portion 11 and having a thread 121 formed on its surface.

[0012] The head portion 11 has a disk-shaped flange 111 at the lower end thereof, which is substantially perpendicular to the extending direction of the bolt portion 12, and a columnar driving projection 112 extending from the flange 111 to the opposite side of the bolt portion 12. The driving projection 112 has four driving portions 113 arranged in an annular shape at equal angular intervals and spaced apart from one another, and four guide portions 114 extending straight and connecting the driving portions 113. Each driving portion 113 has an arc surface section 115 which extends in an arc shape, and two flat sections 116 which extend linearly from both ends of the arc surface section 115 to one guide portion 114. The longest distance B between any two driving portions 113 which are not adjacent to each other is formed to be longer than 1.16 times the longest distance A between two adjacent driving portions 113 (i.e., B / A>1.16).

[0013] Additionally, the radius of curvature C of the arcuate surface section 115 of each driving portion 113 is longer than the length D of each flat section 116. The central angle of the arcuate surface section 115 is less than 180 degrees, and such a configuration corresponds to a configuration in which the length of the curve of the arcuate surface section 115 is shorter than the length of a semicircular curve having the same radius.

[0014] In this embodiment, flange 111 is formed in a disk shape, but since the present invention does not require a circular outline, so long as it is formed in a plate shape, the peripheral shape may be formed in a shape other than circular, and it is also possible to omit flange 111 itself. In this case, drive projection 112 directly connects to the upper surface of bolt portion 12.

[0015] As shown in Figures 1, 4 and 5, a tip 122 at the tip extending from the flange 111 of the bolt portion 12 can be formed into a pointed shape or a flat shape as required.

[0016] 6 to 11 show a second embodiment of the high torque transmission screw 1 of the present invention, and as shown in the figures, in this embodiment, an engagement hole 117 is formed on the upper surface from which the driving projection 112 of the head portion 11 extends. As shown in the figures, the engagement hole 117 can be formed as any one of a square hole (Fig. 10), a hexagonal hole (Fig. 6), a hexagonal star-shaped (Torx (registered trademark)) hole (Fig. 7), a cross-shaped hole (Fig. 8), a U-shaped hole (Fig. 9), or a square cross-shaped hole in which the corners of a square hole are extended in a cross shape (Fig. 11).

[0017] By forming the engagement hole 117 in this manner, as shown in Figure 12, a normal driver bit E that corresponds to the shape of the engagement hole 117 can be inserted into the engagement hole 117 to rotate and operate the second embodiment of the high torque transmission screw of the present invention, thereby increasing versatility.

[0018] 13 and 14 show an embodiment of the tightening tool 2 of the present invention, and as shown in the figures, the tightening tool 2 has a body 21. The body 21 has a passive hole 213 formed to be able to receive the driving projection 112 formed on the head portion 11 of the high torque transmission screw 1. The cross-sectional shape of the passive hole 213 has four driving parts 211 arranged in a ring shape at equal angular intervals and spaced apart from each other, and four guide parts 212 extending straight and connecting each driving part 211, each driving part 211 has an arc surface section 214 extending in an arc shape, and two flat sections 215 extending linearly from both ends of the arc surface section 214 to one guide part 212, the central angle of the arc surface section 214 being less than 180 degrees, and such a configuration corresponds to a configuration in which the curve length of the arc surface section 214 is shorter than the curve length of a semicircle having the same radius. In addition, the longest distance between any two non-adjacent drive portions 211 is longer than 1.16 times the longest distance between two adjacent drive portions 211. The radius of curvature of this arc surface section 214 is longer than the length of any of the flat surface sections 215.

[0019] As shown in Figures 2, 13 and 15, the passive hole 213 formed in the tightening tool 2 of the present invention can receive the driving protrusion 112 formed in the head portion 11 of the corresponding high torque transmission screw 1, and by clamping the driving protrusion 112 with a wrench F as shown in Figure 15, the high torque transmission screw 1 can be turned and operated from the driving protrusion 112.

[0020] In the present invention, the longest distance between any two non-adjacent driving parts 113, 211 is longer than 1.16 times the longest distance between two adjacent driving parts 113, 211, which is greater than the equivalent ratio of 1.1547 in a regular hexagon. Therefore, when the high torque transmission screw 1 of the present invention is turned and operated with the tightening tool 2 or wrench F of the present invention, the occurrence rate of the situation where the tightening tool 2 or wrench F slips relative to the high torque transmission screw 1 can be significantly reduced.

[0021] According to the experimental results, when a conventional flanged hex bolt having an outer diameter of M10 is tightened with a normal wrench, when the applied force increases to about 54 to 55 Nm, the wrench slips off the bolt. However, when experiments were conducted with the high torque transmission screw 1 of the present invention having an outer diameter of M10, no slippage occurred even when the applied force reached 88 Nm, which is the maximum shear torque, demonstrating the effect of preventing slippage.

[0022] 2, 13 and 14, the arcuate contour of the arcuate surface sections 115, 214 can avoid wear between the high torque transmission screw 1 and the tightening tool 2 during tightening, and can maintain good torque transmission. Furthermore, the flat sections 116, 215 increase the area of ​​contact between the tightening tool 2 and the high torque transmission screw 1, improving the engagement and stability between the tightening tool 2 and the high torque transmission screw 1 and canceling torque transmission loss due to dimensional tolerances. Furthermore, the flat section 116 of the high torque transmission screw 1 makes it easier to release the driving projection 112 from the mold when it is manufactured, thereby reducing the risk of the mold being destroyed and reducing the difficulty of manufacturing, and thus has the effect of extending the life of the mold used for manufacturing.

[0023] In summary, due to the slip prevention effect and wear avoidance characteristics of the present invention, for example, when tightening a screw located close to the ground in a narrow space, the tightening tool 2 of the present invention can be easily used instead of an electric screwdriver, and torque transmission and tightening stability can be maintained well. Furthermore, the tip 122 at the tip of the bolt part 12 can be formed into a pointed shape or a flat shape as necessary, so that it can be designed according to the characteristics of the object to be tightened, and further, by providing the engagement hole 117 that can be formed into various shapes in the driving projection 112, it is possible to insert a normal driver bit E into the engagement hole 117 to operate the high torque transmission screw 1 of the present invention, thereby improving the overall versatility. Therefore, it is certain that the object of the present invention can be achieved.

[0024] Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modifications are possible without departing from the gist of the present invention. [Explanation of symbols]

[0025] 1 High torque transmission screw 11 Head section 111 Flange 112 Drive protrusion 113 Drive Part 114 Guide part 115 Circular Section 116 Plane Section 117 Engagement hole 12 Bolt section 121 thread 122 Tip 2 Fastening tools 21 Main unit 211 Drive section 212 Guide part 213 Passive hole 214 Circular Section 215 Plane Section A Distance B distance C radius of curvature D Length E Driver Bit F Wrench

Claims

1. A high torque transmission screw including a head portion formed in a columnar shape and a bolt portion extending from one end of the head portion and having at least one thread formed on a surface thereof, The cross-sectional shape of the columnar driving projection at the other end opposite to the one end of the head portion has four driving portions arranged in a ring shape at equal angular intervals and spaced apart from each other, and four guide portions extending straight and connecting each of the driving portions, Each of the drive portions has an arcuate surface section extending in an arc shape, and two flat sections extending linearly from both ends of the arcuate surface section to one of the guide portions, and the central angle of the arcuate surface section is less than 180 degrees; A high torque transmission screw, characterized in that the longest distance between any two of said driving portions that are not adjacent to each other is longer than 1.16 times the longest distance between two of said driving portions that are adjacent to each other.

2. 2. The high torque transmission screw according to claim 1, wherein the radius of curvature of the arcuate surface section of each of the driving portions is greater than the length of each of the planar sections.

3. 2. The high torque transmission screw according to claim 1, wherein an engagement hole is formed on an upper surface of the head portion from which the driving projection extends.

4. The high torque transmission screw according to claim 3, characterized in that the engagement hole is any one of a square hole, a hexagonal hole, a hexagonal star-shaped (Torx (registered trademark)) hole, a cross-shaped hole, a U-shaped hole, and a square cross-shaped hole.

5. 2. The high torque transmission screw according to claim 1, wherein a flange is formed at the one end of the head portion, the flange being substantially perpendicular to the extending direction of the bolt portion.

6. A tightening tool used for tightening a high torque transmission screw according to claim 1, comprising a body having a passive hole formed to be capable of receiving the driving projection of the head portion of the high torque transmission screw, the cross-sectional shape of the passive hole having four driving portions arranged in a ring shape at equal angular intervals and spaced apart from one another, and four guide portions extending straight and connecting each of the driving portions, Each of the drive portions has an arcuate surface section extending in an arc shape, and two flat sections extending linearly from both ends of the arcuate surface section to one of the guide portions, and the central angle of the arcuate surface section is less than 180 degrees; A tightening tool, characterized in that the longest distance between any two of said driving portions that are not adjacent to each other is longer than 1.16 times the longest distance between two of said driving portions that are adjacent to each other.

7. 7. The fastening tool of claim 6, wherein the radius of curvature of the arcuate surface section of each of the drive portions is greater than the length of each of the planar sections.

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