JP2010054015A - Screw member and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw enabling reinforcement of its grooves and sure rotation while suppressing cracking of the grooves. <P>SOLUTION: A screw member has a threaded shank 2 and a head 1 continued to the shank and is furnished with grooves 4 at the head, and a projection 6 is formed at the surface 3 of the head in the neighborhood of the grooves. When viewed from above, the grooved part is formed of multiple grooves having a rectangular shape consisting of shorter edges and longer edges or overlapped rectangles, and the projection is formed in the surface of the head in the neighborhood of the grooves and on the longer edge side of the grooved part. The projection has a shape of curved surface at least on the groove side, and is provided continuously over the whole area around the grooved part on the head surface. The manufacturing method includes a process to weld the projection to the neighborhood of the grooved part on the head surface. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a screw member, and more particularly, to a screw member having a groove for fitting a nut wrench or driver bit on the top surface of the head and a method for manufacturing the same.

  Conventionally, many screw members, particularly screws, have been used as means for attaching and fixing various components.

  As shown in FIG. 6, the screw generally has a shaft 2 on which a screw is formed, and a head 1 provided continuously to the shaft. A groove 4 for fitting the driver bit 11 is provided. In FIG. 6, the screw of one groove portion 4 for fitting the driver bit 11 of the minus driver is described. However, the screw bit of the plus driver is provided on a screw provided with two groove portions 4, that is, a cross-shaped groove portion. 11 is used by fitting, and when the groove 4 is a plurality of three or more, the driver bit 11 corresponding to the groove 4 is used.

Conventionally, the following problems have occurred when using the screws.
(1). A nut wrench or driver bit 11 is fitted in the groove 4 of the screw head 1 and the nut wrench or driver bit 11 is rotated to rotate the driving force from the cutting edge of the nut wrench or driver bit 11 to the screw. To communicate. At that time, the force of the cutting edge is excessively applied to the uppermost portion of the groove portion 4 and the vicinity thereof, and the uppermost portion of the groove portion 4 and the vicinity thereof may be rolled.
(2). When the screw tightening to the part is completed, the nut wrench or the driver bit 11 slips out of the groove portion 4, and the uppermost portion of the groove portion 4 and the vicinity thereof may be rolled at that time.
(3). As a result of (1) and (2), the screw life may be shortened.

As a related technique, there is a technique that reduces the force of the blade edge of the driver applied to the uppermost part of the groove part 4 and its vicinity by the arch effect obtained by providing the groove part 4 with the second groove part that is one step deeper. It is known (see, for example, Patent Document 1).
Also, as a related technology, in a cross-recessed screw, by providing a unique fitting part on the screw, the driver bit is firmly fitted into the screw, and the engagement blade of the driver bit does not slip out of the screw drive hole. Is known (see, for example, Patent Document 2).

JP 2006-189074 A JP 2003-166516 A

  However, even if it reduces the force of the blade edge of the driver applied to the uppermost part of the groove part and the vicinity thereof, or even if it makes it difficult to slip when the driver bit is fitted into the screw, it can reduce the risk of the screw groove part rolling, It was still not enough.

  An object of the present invention is to provide a screw member that can reinforce and reliably rotate a screw groove portion while suppressing twisting of the screw groove portion.

  A first aspect of the present invention is a screw member having a shaft on which a screw is formed and a head portion provided continuously to the shaft, and having a groove portion formed on the head portion. A protrusion is provided in the vicinity of the groove on the surface of the portion.

  According to a second aspect of the present invention, in the invention according to the first aspect, when the groove portion is viewed from above, a rectangular shape consisting of a short side and a long side, or a multi-row groove in which the rectangles are superimposed The protrusion is provided in the vicinity of the groove on the surface of the head and on the long side of the groove.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the projection has a curved surface shape at least on the groove portion side.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the protrusion is provided continuously in the entire vicinity of the groove on the surface of the head. It is what.

  According to a fifth aspect of the present invention, there is provided a screw member manufacturing method comprising: a shaft on which a screw is formed; and a head portion provided continuously to the shaft; and forming a groove portion in the head portion, A protrusion is welded and provided in the vicinity of the groove on the surface of the portion.

  According to the present invention, the screw groove portion itself can be reinforced and reliably rotated while suppressing the twisting of the screw groove portion.

The inventor studied various methods for smoothly rotating the screw without twisting the groove provided on the screw head.
As a result, the inventor provides protrusions on the screw head where the force of the blade edge of the driver is applied, so that even if the force of the blade edge of the driver applied to the uppermost portion of the groove portion and the vicinity thereof is applied, It has been found that the possibility that the screw is remarkably reduced and that the screw can be reliably rotated without twisting the groove.
The present invention has been made based on this finding. Hereinafter, the best mode for carrying out the present invention will be described.

(Embodiment 1)
FIG. 1A is a perspective view of a screw that is a screw member according to the present embodiment, FIG. 1B is a cross-sectional view, and FIG. 1C is a plan view.
As shown in FIG. 1A, the screw in the present embodiment has a shaft 2 on which a screw is formed and a head 1 provided continuously to the shaft 2, and the surface 3 of the head 1. The groove part 4 is formed in.
As specific dimensions, the head 1 has a diameter of 12 mm and a height of about 10 mm, and the shaft 2 has a diameter of about 7 mm and a height of about 30 mm. The dimensions described are not limited.
In this embodiment, the screw is used as the screw member, but it may be used as a screw member such as a bolt or a wood screw.
Further, as the material of the screw, any material generally used as a screw may be used, and examples thereof include iron and stainless steel.

The screw head 1 has a flat shape, and a groove 4 for fitting a minus driver bit 11 is provided in the center of the surface 3 thereof. In FIG. 1, the screw head 1 is a flat type, but may be a round type. Moreover, in FIG. 1, although the surface 3 of the screw head 1 is chamfered, it is not necessary to chamfer.

  The groove portion 4 is formed by a single groove for fitting a driver bit 11 of a minus driver. As shown in FIG. 1C, when the groove 4 is viewed from above, the groove 4 has a length in the longitudinal direction of the groove 4 (hereinafter also referred to as a long side direction) that is the diameter of the screw head 1. It has a rectangular shape with a length that does not exceed. As specific dimensions, the groove portion 4 has a long side of 7 mm × a short side of 2 mm, and the depth of the groove portion 4 is 4 mm.

Here, in the screw of this embodiment, as shown in FIG. 1C, a protrusion 6 is provided in the vicinity of the groove portion 4 on the surface 3 of the head 1.
At this time, it is preferable that the protrusion 6 is provided in the vicinity of the groove portion 4 on the surface 3 of the head 1 and on the long side of the groove portion 4.
Further, as shown in FIGS. 1A and 1B, the protrusion 6 preferably has a curved surface shape at least on the groove portion 4 side.
As specific dimensions, the protrusion 6 is a hemisphere provided on the surface 3, and the diameter of the hemisphere is about 1 mm.

Here, the manufacturing method of the screw which is the screw member according to the present embodiment will be described.
First, stainless steel, which is a screw material, is cut to produce a screw having a shaft 2 on which a screw is formed and a head 1 provided continuously to the shaft 2.
Next, the groove 4 is formed in the head 1 by cutting.
And the protrusion which consists of stainless steel of the same material as a bis | screw is provided in the vicinity of the said groove part 4 in the surface 3 of the said head 1 by welding. The protrusion 6 may be made of the same material as the screw, or may be a material capable of reinforcing other screws. Further, when the screw head 1 is cut, the surface 3 of the screw head 1 may be cut so as to have the protrusion 6.

Here, the effect produced by the screw which is the screw member according to the present embodiment will be described in comparison with a conventional screw.
In the conventional screw shown in FIG. 6, the side wall 4 a of the groove 4 is formed perpendicular to the surface 3. As a result, the boundary portion between the surface 3 and the groove portion 4 was highly likely to be swollen by the driver bit 11.
However, in the screw according to the present embodiment shown in FIG. 1, a projection 6 having a curved surface is provided in the vicinity of the groove 4 on the surface 3 of the screw head 1, thereby providing a boundary portion between the surface 3 and the groove 4. The pressure applied by the driver bit 11 can be reduced. Furthermore, the screw groove 4 itself can be reinforced. As a result, the service life of the screw can be extended and the screw can be reliably rotated.
The protrusion 6 may be provided on the screw head 1 at a portion to which pressure is applied by the driver bit 11, and is continuous to the entire vicinity of the groove 4 as shown in FIGS. 5 (a), 5 (b), and 5 (c). A protrusion 6 may be provided.

(Embodiment 2)
2A is a perspective view of a screw according to another embodiment, FIG. 2B is a sectional view thereof, and FIG. 2C is a plan view thereof.
As shown in FIG. 2 (c), the screw according to the present embodiment includes a screw having a length in which the long side of the groove 4 exceeds the diameter of the screw head 1 when the groove 4 is viewed from above. Except for the above, it is the same screw as in the first embodiment.

Here, in the screw of the present embodiment, as shown in FIG. 2C, a protrusion 6 is provided in the vicinity of the groove 4 on the surface 3 of the head 1 and on the long side of the groove 4.
According to the present embodiment, the pressure applied by the minus driver bit 11 to the boundary portion between the surface 3 and the groove 4 by providing the projection 6 having a curved surface in the vicinity of the groove 4 on the surface 3 of the screw head 1. The groove portion 4 of the screw can be reinforced by providing the protrusion 6 (FIG. 2B). As a result, the service life of the screw can be extended and the screw can be reliably rotated.

(Embodiment 3)
3A is a perspective view of a screw according to another embodiment, FIG. 3B is a sectional view thereof, and FIG. 3C is a plan view thereof.
The screw is an embodiment except that the two grooves are formed at the center of the surface 3 of the screw head 1 and have a cross-shaped groove portion 4 by vertically intersecting with the center point of the groove being coincident. 1 is the same screw.

Here, in the screw of the present embodiment, when viewed from above, each groove forming the cross-shaped groove 4 (FIGS. 3A and 3C) has a curved shape at least on the groove 4 side. A protrusion 6 is provided in the vicinity of the groove 4 on the surface 3 of the head 1 and on the long side of the groove 4 (FIGS. 3A and 3B).
According to the present embodiment, the pressure applied by the plus driver bit 11 to the boundary portion between the surface 3 and the groove portion 4 by providing the curved projection 6 in the vicinity of the groove portion 4 on the surface 3 of the screw head 1. Can be reduced. Furthermore, the screw groove 4 itself can be reinforced. As a result, the service life of the screw can be extended and the screw can be reliably rotated.

  In FIG. 3, a screw having a cross-shaped groove including two grooves for fitting the driver bit 11 of the plus driver is described, but the number of the grooves may be three or more. Specifically, a driver bit corresponding to the plurality of grooves is used for a screw having a multi-groove formed by superimposing the rectangles, that is, a screw in which three or more grooves intersect at the center of the surface.

(Embodiment 4)
4A is a perspective view of a screw that is a screw member according to the present embodiment, FIG. 4B is a cross-sectional view, and FIG. 4C is a plan view.
As shown in FIG. 4A, the screw in the present embodiment has a shaft 2 on which a screw is formed and a head 1 provided continuously to the shaft 2, and the surface 3 of the head 1. Is formed with a groove 4 for fitting the hex nut wrench 12.
Specifically, the screw head 1 has a diameter of 12 mm and a height of about 10 mm, and the screw shaft 2 has a diameter of 7 mm and a height of about 30 mm.

  The screw head 1 is a flat type, and a groove 4 for fitting a hex nut wrench is provided at the center of the surface 3 of the screw head 1. Further, the surface 3 of the screw head 1 is chamfered.

As shown in FIG. 4C, when the groove 4 is viewed from above, the groove 4 has a regular hexagonal shape for fitting a hex nut wrench 12.
As specific dimensions, one side of the regular hexagonal groove 4 is 6 mm, and the depth of the groove 4 is 4 mm.
In addition, although the screw | thread of the regular hexagon-shaped groove part 4 for fitting the wrench for hexagon nuts was described in FIG. 4, the said groove part 4 may be shapes other than a regular hexagon.

Here, in the screw of the present embodiment, as shown in FIGS. 4A and 4B, a protrusion having a curved surface shape in the vicinity of the groove 4 on the surface 3 of the head 1, at least on the groove 4 side. 6 is provided.
As specific dimensions, the protrusion 6 is a hemisphere provided on the surface 3, and the diameter of the hemisphere is about 1 mm.

  According to the present embodiment, by providing the projection 6 having a curved surface in the vicinity of the groove 4 on the surface 3 of the screw head 1, the hex nut wrench 12 adds to the boundary between the surface 3 and the groove 4. Pressure can be reduced. Furthermore, the screw groove 4 itself can be reinforced. As a result, the service life of the screw can be extended and the screw can be reliably rotated.

It is a figure of the screw member concerning this embodiment, (a) is a perspective view, (b) is sectional drawing, (c) is a top view. It is a figure of the screw member concerning another embodiment, (a) is a perspective view, (b) is a sectional view, and (c) is a top view. It is a figure of the screw member concerning another embodiment, (a) is a perspective view, (b) is a sectional view, and (c) is a top view. It is a figure of the screw member concerning another embodiment, (a) is a perspective view, (b) is a sectional view, and (c) is a top view. It is a figure which shows the modification of the screw member which concerns on this embodiment, (a) is a perspective view, (b) is sectional drawing, (c) is a top view. It is a figure which shows the conventional screw member, (a) is a perspective view, (b) is sectional drawing, (c) is a top view.

Explanation of symbols

1 Head 2 Shaft 3 Screw Head Surface 4 Groove 4a Groove Side 6 Protrusion 11 Driver Bit 12 Hex Nut Wrench

Claims (5)

A screw member having a shaft on which a screw is formed and a head portion provided continuously to the shaft; and a groove portion formed on the head portion,
A screw member, characterized in that a protrusion is provided in the vicinity of the groove on the surface of the head. When the groove portion is viewed from above, it is formed by a rectangular shape consisting of short sides and long sides, or a multi-groove groove in which the rectangles are superimposed,
The screw member according to claim 1, wherein the protrusion is provided in the vicinity of the groove portion on the surface of the head portion and on the long side of the groove portion.   The screw member according to claim 1, wherein the protrusion has a curved surface shape at least on the groove portion side.   The screw member according to any one of claims 1 to 3, wherein the protrusion is continuously provided in the entire vicinity of the groove on the surface of the head. A method of manufacturing a screw member that includes a shaft on which a screw is formed and a head portion provided continuously to the shaft, and forms a groove in the head portion,
A method for manufacturing a screw member, characterized in that a projection is provided by welding in the vicinity of the groove on the surface of the head.

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