TWI844366B - The improvement of screws - Google Patents

Abstract

The invention is an improvement to a screw, comprising a screw shaft, a threaded portion, and at least one protrusion. The threaded portion is formed by connecting multiple threaded units, and the protrusion is raised on the outer peripheral surface of the shaft between two threaded units. The front end of the protrusion is tapered, forming a cone-shaped section, and the rear end of the protrusion extends into a tail wing on each side towards the threaded units. The tapered front end of the protrusion allows the screw to easily break through the interior of the workpiece during the screwing process, creating a gap between the shaft and the workpiece, reducing friction between the screw and the workpiece. This invention facilitates easier screw insertion. The tail wing at the rear end of the protrusion prevents the screw from loosening.

Description

Improvement of screws

The present invention relates to screws, and in particular to an improved screw with a labor-saving and anti-loosening structure.

FIG8 is a cross-sectional view of a general screw 900 locked into a wooden workpiece 90. As shown in the figure, the screw 900 includes a screw body 91, a head 92 connected to one end of the screw body 91, and a threaded portion 93 that is a spiral protrusion and surrounds the outer circumference of the screw body 91. When the screw 900 is locked into the wooden workpiece 90, the surface of the screw body 91 is in contact with the screw body 91. The surface of the threaded portion 93 is all against the wood workpiece 90, so friction is generated between the screw body 91 and the surface of the threaded portion 93 and the wood workpiece 90, and the operator must use force to lock it in, which is laborious. Sometimes the screw may break due to excessive force due to difficulty in locking. In addition, the anti-loosening ability of this type of screw is insufficient, and its use is limited to places where anti-loosening is required.

Although Taiwan's new patent M640656 can overcome some of the problems of the above-mentioned prior art, the mold manufacturing of this case is more difficult and the cost is relatively high. Although this case has an anti-loosening effect, there is still room for improvement. In addition, this case can only reduce the friction between the outer peripheral surface of the screw rod and the workpiece, but cannot reduce the friction between the screw thread and the workpiece.

The present invention discloses an improvement of a screw, comprising a screw body, a threaded portion and at least one convex pattern, wherein the threaded portion is formed by connecting a plurality of threaded units in series, the threaded portion surrounds the outer peripheral surface of the screw body in a spiral protrusion manner, the convex pattern is convexly arranged on the outer peripheral surface of the screw body between two adjacent threaded units of the threaded portion, the front end of the convex pattern is a tapered portion, and the tapered portion is provided with tail wings extending toward the rear end of the convex pattern in the direction of the threaded units on both sides, the cross-section of each tail wing is a triangle, and the height of each tail wing from the front side to the rear side is the same.

In one embodiment, the threaded portion is formed by connecting a plurality of continuous threaded units in series, each of which is threaded on the outer peripheral surface of the screw rod body for a length greater than a pitch, and each of which has a crest ridge in the thread direction, the crest ridge including two ascending curves and two descending curves, the crest ridge is connected by the ascending curves and the descending curves in an alternating manner, and at the position where the ascending curve is connected to the descending curve There is a peak high point, and there is a peak low point at the position where the gradual curve connects the gradual curve. Each thread unit has two peak high points and two peak low points, and the peak high points and the peak low points are arranged alternately in front and back. The cross-sectional width of the thread unit at the peak high point is the widest, and the cross-sectional width of the thread unit at the peak low point is the narrowest. The width of the thread unit gradually decreases from the peak high point to the peak low point.

In one embodiment, the high points of the spiral peaks are connected from top to bottom to form a spiral shape, and the low points of the spiral peaks are connected from top to bottom to form a spiral shape.

In one embodiment, each thread unit is threaded around the outer circumference of the screw rod body at 372 degrees.

In one embodiment, the cross-section of the screw has each thread unit that is elliptical when viewed from above or from below.

In one embodiment, the end of each tail wing contacts the adjacent threaded unit.

In one embodiment, the front ends of the two tail wings are connected, and there is a corner on the inner side of the connection. The corner is a straight line. The straight line has a vertex and a bottom end point. The straight line tilts backward from the vertex to the bottom end point.

In one embodiment, the height of the tail wing is less than the height of the thread unit.

The convex structure provided by the improvement of the screw of the present invention not only makes it easier to screw the screw into the workpiece, but also has a good anti-loosening effect. The molding mold is easy to manufacture, which can solve the anti-loosening and molding problems of TM640656. Since the widest and highest point of the thread unit is at the peak of the screw, the workpiece is cut and propped open by the peak of the screw. Because the thread unit is only widest and highest at the peak of the screw, the width and height of other places are smaller than the position of this point. After the workpiece is cut by the peak of the screw, a gap is generated between the width direction and height direction of other positions of the thread unit and the workpiece, thereby reducing the friction between the thread unit and the workpiece, which can save effort when locking the screw.

Previous technology:

900: Screws

90: Wooden workpieces

91: Screw body

92: Head

93: Threaded part

The present invention:

100: Improvement of screws

10: Screw rod body

20: Threaded part

201: Thread

13: Outer surface

11: Head

111: groove

12: Tip

21: Thread unit

22: Spiral Peak Ridge

221: Gradient curve

222: Gradient curve

23: Spiral Peak High Point

24: Spiral peak low point

D1: Horizontal width at the highest point of the spiral peak

D2: Horizontal width of the spiral peak low point

70: Workpiece

G: Gap

g1: gap

H1: Height

h1: height

61:Front side

62: Rear side

301: Cone

302: Tail wing

303: Long bevel

304: Corner

305: Top point

306: bottom end

307: Straight line

308: Long inclined plane

309: Tip

30: Embossed

Figure 1 is a schematic plan view of the appearance of an improved embodiment of the screw of the present invention.

Figure 2 is a schematic diagram of the 2-2 section line in Figure 1.

Figure 3A is a top view of the unfolded screw unit in Figure 1.

Figure 3B is a side view of the unfolded thread unit in Figure 1.

Figure 4 is an enlarged view of the convex pattern and screw unit in Figure 1.

Figure 5 is a cross-sectional line diagram of section 5-5 in Figure 4.

Figure 6 is a cross-sectional line diagram of section 6-6 in Figure 4.

Figure 7 is a schematic diagram of the usage status in Figure 1.

Figure 8 is a schematic diagram of the use of the screw.

In order to enable the examiner to have a further understanding of the characteristics and features of the present invention, the following preferred embodiments are listed and illustrated as follows: Referring to Figures 1 to 6, the present invention is an improved screw 100, comprising a screw rod 10, a threaded portion 20, and a plurality of convex grooves 30.

The screw shaft 10 mainly constitutes the main body of the screw improvement 100, which has an outer peripheral surface 13. The screw shaft 10 is provided with a head 11 and a tip 12 at the upper end and the lower end respectively. The head 11 is provided with a groove 111 for a screwdriver to engage. The threaded portion 20 surrounds the outer peripheral surface 13 of the screw shaft 10 in a spiral protrusion manner. The threaded portion 20 is composed of a plurality of continuous thread units 21 connected in series. Each thread unit 21 is convexly arranged on the outer circumference 13 of the screw rod body 10 in a spiral manner. From the cross-section of the screw improvement 100, the cross-section of each thread unit 21 is elliptical in top view or bottom view (see Figure 2), and each thread unit 21 exceeds the length of one pitch. In the embodiment, each thread unit 21 is spirally wound on the outer circumference of the screw rod body 10 for more than 360 degrees, and in this embodiment, it is 372 degrees.

In this embodiment, each thread unit 21 has a crest ridge 22 in the thread direction. The crest ridge 22 includes two ascending curves 221 and two descending curves 222. The ascending curves 221 and the descending curves 222 are connected together in an alternating manner, forming a descending curve 222 between two ascending curves 221 and a ascending curve 221 between two descending curves 222, which looks like an ellipse as shown in FIG. 2 . The position where the ascending curve 221 connects to the descending curve 222 has a spiral crest high point 23, and the position where the descending curve 222 connects to the ascending curve 221 has a spiral crest low point 24, that is, the spiral crest ridge 22 is not all of the same height, but is formed by two ascending curves 221 and two descending curves 222 connected alternately, and the adjacent ascending curves 221 and descending curves 222 are mutually extended and connected in series to form a progressive and undulating thread unit 21, and then connected And extend the next thread unit 21, repeat this cycle until the end of the thread. The thread unit 21 in this embodiment has two screw crest high points 23 and two screw crest low points 24, and each screw crest high point 23 and each screw crest low point 24 are arranged in a front-to-back staggered manner, one high and one low, one high and one low. From the appearance of the improved screw 100, all the screw crest high points 23 in Figure 1 are connected from top to bottom to form a spiral, and all the screw crest low points 24 are connected from top to bottom to form a spiral. In the embodiment of FIG. 3A , the width of the thread unit 21 gradually decreases from the peak high point 23 to the peak low point 24 , that is, the transverse width D1 of the thread unit 21 is the widest at the peak high point 23 , and the transverse width D2 is the narrowest at the peak low point 24 . In one embodiment, each convex pattern 30 is convexly disposed on the outer circumference of the screw rod body 10 between two threaded units 21, and the convex patterns 30 are formed in a spiral shape and arranged obliquely. The direction of the convex patterns 30 surrounding the threaded portion 20 is the same as that of the threaded portion 20, which is a forward spiral. Of course, the convex patterns 30 can also adopt a reverse spiral, or be arranged in a straight line in the same direction as the screw rod body 10. In addition, multiple convex patterns 30 can also be provided between two threaded units 21.

In one embodiment, the front end of the convex pattern 30 has a tapered portion 301, and the tapered portion 301 has a tip 309. A tail wing 302 extends from the tapered portion 301 toward the threaded unit 21 on both sides of the rear end of the convex pattern 30. The direction from the front end to the rear end of the convex pattern 30 is the same as the spiral direction of the threaded portion 20. The distance between the two tail wings 302 gradually increases toward the rear side. The cross-section of the two tail wings 302 is a triangle (see FIG. 5), and the height from the front end to the rear end of each tail wing 302 is the same. The rear side of the two tail wings 302 each has a long inclined surface 303, and the front side of the two tail wings 302 each has a long inclined surface 308. The heights of the shaped inclined surface 303 and the elongated inclined surface 308 from the front side 61 to the rear side 62, that is, from the root to the end, are the same. In the embodiment, the ends of the two tail wings 302 are respectively in contact with the adjacent threaded unit 21. In addition, the front ends of the two tail wings 302 are connected, and the inner side of the connection is a corner 304, and the corner 304 is a straight line 307. The straight line 307 of the corner 304 has a vertex 305 and a bottom end 306. The straight line 307 is inclined from the vertex 305 to the rear side 62 to the bottom end 306 to form an inclined line. In addition, the height h1 of the tail wing 302 (also the height of the vertex 305) is less than the height H1 of the threaded unit 21. Furthermore, the solid-line convex pattern 30 in FIG. 1 is visible directly from the front of the screw, while the dotted-line convex pattern 30 is on the back of the screw and cannot be seen from the front.

The above is an introduction to the components and features of the improved screw 100 provided by a preferred embodiment of the present invention. Next, its use features are described as follows: Please refer to FIG. 7. When the improved screw 100 of the present invention is locked into the workpiece 70, since the widest and highest points of the thread unit 21 are at the connection point where the gradual increase curve 221 connects the gradual decrease curve 222, that is, the screw peak high point 23, the workpiece 70 is cut open and stretched open by the screw peak high point 23. Because the thread unit 21 is only widest and highest at the screw peak high point 23, and the width and height of other places are smaller than the position of this point, after the workpiece 70 is cut open by the screw peak high point 23, the width direction and height direction of the thread unit 21 at other positions except the screw peak high point 23 are the same as the workpiece. 70 will produce a gap g1 (see Figure 7), as shown in Figure 7, the screw peak high point 23 contacts the workpiece 70, and the other positions do not contact the workpiece 70 and have the gap g1, so that the friction between the thread unit 21 and the workpiece 70 can be reduced, which can save effort when locking the screw, and the tapered portion 301 at the front end of the convex pattern 30 can use its tip 309 and tail wing 33 to allow the screw to The improved screw 100 is more conducive to breaking the inside of the workpiece 70 during the process of screwing into the workpiece 70, and the convex pattern 30 can push the workpiece 70 apart, so that a gap G is generated between the screw rod body 10 and the workpiece 70, reducing the contact area between the workpiece 70 and the screw rod body 10, reducing the friction between the screw rod body 10 and the workpiece 70, and making the screwing of the improved screw 100 more labor-saving. On the other hand, after the improved screw 100 is screwed in the workpiece 70, the two tail wings 33 at the rear end of the convex pattern 30 form a bow-shaped surface. The tail wings of this structure have the same height from the front to the rear, which can prevent the improved screw 100 from loosening after being locked. It has a better anti-loosening effect than the previous technology, and completely improves and solves the problems of the previous technology.

The direction from the front side 61 to the rear side 62 of the convex pattern 30 in all the aforementioned embodiments of the present invention is along the direction of the threaded portion 20, that is, the direction from the front side 61 to the rear side 62 of the convex pattern 30 is the same as the spiral direction of the threaded portion 20. The figures of this case show forward threads, and reverse threads (not shown) can also be used in other embodiments, and the effects are the same and will not be described in detail.

The above disclosure is only a preferred embodiment of 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 of the present invention.

100: Improvement of screws

10: Screw rod body

20: Threaded part

13: Outer surface

11: Head

111: groove

12: Tip

21: Thread unit

23: Spiral Peak High Point

24: Spiral peak low point

30: Embossed

Claims (10)

An improvement of a screw includes a screw body, a threaded portion and at least one convex pattern. The threaded portion is formed by connecting a plurality of threaded units in series. The threaded portion surrounds the outer peripheral surface of the screw body in a spiral protrusion manner. The convex pattern is convexly arranged on the outer peripheral surface of the screw body between two adjacent threaded units of the threaded portion. The front end of the convex pattern is a tapered portion. The tapered portion is respectively provided with tail wings extending toward the rear end of the convex pattern toward the threaded units on both sides. The cross-section of each tail wing is a triangle, and the height of each tail wing from the front side to the rear side is the same. The improvement of the screw as described in item 1 of the patent application, wherein the threaded portion is formed by connecting a plurality of continuous threaded units in series, each threaded unit is wound around the outer peripheral surface of the screw rod body for a length greater than one pitch, each threaded unit has a crest ridge in the thread direction, the crest ridge includes two ascending curves and two descending curves, the crest ridge is connected by the ascending curves and the descending curves in an alternating manner, and the ascending curves are connected to each other in a staggered manner. There is a spiral peak high point at the position where the gradual curve is connected, and there is a spiral peak low point at the position where the gradual curve is connected to the gradual curve. Each thread unit has two spiral peak high points and two spiral peak low points, and the spiral peak high points and the spiral peak low points are arranged alternately in front and back. The cross-sectional width of the thread unit at the spiral peak high point is the widest, and the cross-sectional width of the thread unit at the spiral peak low point is the narrowest. The width of the thread unit gradually decreases from the spiral peak high point to the spiral peak low point. The improvement of the screw as described in item 2 of the patent application scope, wherein the high points of the screw crests are connected from top to bottom to form a spiral shape, and the low points of the screw crests are connected from top to bottom to form a spiral shape. The improvement of the screw as described in item 2 of the patent application scope, wherein each thread unit is screwed around the outer peripheral surface of the screw rod body by 372 degrees. An improvement on a screw as described in claim 2, wherein each thread unit of the screw is elliptical in cross-section when viewed from above or from below. An improvement on a screw as described in any one of items 2 to 5 of the patent application scope, wherein the end of each tail wing contacts the adjacent threaded unit. An improvement on the screw as described in any one of items 2 to 5 of the patent application scope, wherein the front ends of the two tail wings are connected, and there is a corner on the inner side of the connection, the corner is a straight line, the straight line has a vertex and a bottom end point, and the straight line tilts backward from the vertex to the bottom end point. An improvement of a screw as described in any one of items 2 to 5 of the patent application scope, wherein the height of the tail wing is less than the height of the thread unit. An improvement on the screw as described in item 1 of the patent application, wherein the end of each tail wing contacts the adjacent threaded unit. As for the improvement of the screw described in item 1 of the patent application scope, the front ends of the two tail wings are connected, and there is a corner on the inner side of the connection, and the corner is a straight line, and the straight line has a vertex and a bottom end point, and the straight line is inclined backward from the vertex to the bottom end point.

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