JP2002357208A - Screw component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screw component capable of easily fastening a fastened member in a location where a working space is narrow or visibility is poor. SOLUTION: A slanting installation of a fastening tool is practical so that a slant face in which a polygon formed on the top surface is widened toward from the tip of a head portion to a lower portion is arranged in the head portion as a connecting portion with the fastening tool. Or, upon arranging a polygonal ball-shaped bulging portion 22 in section in the head portion 21 and also forming a narrow part 27 between the ball-shaped bulging portion 22 and a seated surface 25, the fastening member is tightened by slantly installing the fastening tool such as a socket wrench.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a screw part which can be easily fastened even when the working space for fastening a bolt is limited or visibility is poor.

[0002]

2. Description of the Related Art Conventionally, screw parts such as bolts used for fastening members are hexagonal bolts having a hexagonal head or cap screw bolts having a hexagonal hole in the head. Are known. In the case of a hexagon bolt, a fastening tool such as a spanner is engaged with the head, and in the case of a cap screw bolt, a fastening tool such as an L-shaped hexagon wrench is mounted in a hole in the head. The member to be fastened can be tightened and fixed to the mounting member by rotating the shaft portion by torque.

However, when other members are present in the vicinity of the fastening portion and a sufficient space for fastening the bolt cannot be secured, the fastening operation cannot be performed using a tool such as a spanner or a hexagon wrench. Therefore, a large amount of time is required for tightening. Therefore, in such a case, conventionally, as shown in FIGS. 5 and 6, a socket 2 is inserted into a bolt head 1 and a fastening tool such as a universal joint 3 or a flex ratchet handle 4 is attached to the socket 2. Then, the bolt 8 is tightened by the fastening tool via the socket 2 while avoiding the other member 5, and the member 6 to be fastened is fixed to the mounting member 7.

[0004] However, in an assembly line such as an automobile, a fastening tool is commonly used with a peripheral assembling portion. Therefore, when performing the complicated bolt fastening work as described above, the universal joint 3 or the flex ratchet is required. Special tools such as the handle 4 must be newly prepared, and such special tools are expensive, and the types of work tools increase, and it takes time to select tools when performing various works. There was a problem. Also, the narrow work space as described above often has poor visibility,
After the universal joint 3 and the flex ratchet handle 4 are set at predetermined positions on the bolt 8 and rotated, a series of operations of releasing these engagements and setting the rotatable angle again is very troublesome. For this reason, there has been a problem that workability is significantly reduced.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and provides a threaded part which can easily fasten a member to be fastened even in a place where a work space is narrow or visibility is poor. It was done to do so.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a screw component according to the present invention comprises a shaft having a thread formed thereon and a head provided with an engaging portion for engaging a fastening tool. Wherein the polygon formed on the top surface as the engaging portion is enlarged downward and divergently from the tip of the head to provide a sloped side surface, thereby enabling a diagonal mounting of the fastening tool. It is a feature. In addition, the threaded part of the present invention provides a ball-shaped bulge having a polygonal cross section as an engagement part, and a slanted mounting of a fastening tool between the ball-shaped bulge and the seat surface. A part is formed.

[0007] The screw component of the present invention is provided with a slanted side surface by enlarging a polygon such as a hexagon formed on the top surface downwardly from the tip of the head and providing a slanted side surface. A fastening tool such as a wrench can be easily mounted diagonally. Also, by providing a ball-shaped bulging portion having a polygonal cross section as an engaging portion, and by forming a constricted portion between the ball-shaped bulging portion and the head seat surface, the ball-shaped bulging portion is also provided. The fastening tool can be easily mounted diagonally. Further, since the engaging portion is formed in a polygonal cross section and provided with corners, torque can be easily transmitted by the tightening tool. Therefore, even when the working space is narrow or visibility is poor, the member to be fastened can be easily fastened and fixed to the mounting member.

[0008]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a view showing a front surface and a plane of a head of a screw component according to a first embodiment of the present invention. The screw component is a bolt including a shaft portion 11 and a head portion 21. A thread 13 is formed at the lower end of the screw 11 so that it can be screwed into a screw hole (not shown) of the mounting member.

The head 21 of the bolt is formed with a ball-shaped bulging portion 22 having a hexagonal cross section as an engaging portion with a fastening tool, and the top surface 23 of the bolt has a ball-shaped maximum bulging portion. It is formed in a hexagon having an area smaller than 24 hexagons. A constricted portion 27 is formed between the ball-shaped bulging portion 22 and a flange portion 26 having a seating surface 25 on the back side, so that a socket wrench having a hexagonal hole can be mounted on the ball-shaped bulging portion 22. This allows the head 21 to rotate in torque. The cross-sectional shape of the ball-shaped bulging portion 22 is not limited to a hexagon, but may be a polygon such as a square or an octagon capable of transmitting torque. In addition, a portion of the ball-shaped bulging portion 22 in contact with the fastening tool,
That is, if the vicinity of the maximum bulging portion 24 is formed in a polygonal shape, the tightening torque can be transmitted without rotating the fastening tool, and the head 21 can be rotated. Therefore, the shape in the vicinity of the constricted portion 27 and the top surface 23 does not necessarily need to be polygonal in cross section, and may be circular or slightly elliptically deformed.

In the screw part shown in FIG. 1, the shaft 11 is made of metal, and the head 14 of the shaft 11 is made of resin.
Are fixed and combined by integral molding. The head 14 is a disc-shaped base 1 as shown in FIG.
5, a plurality of small convex portions 16 are formed on the upper surface, and the resin convex portion 21 fixed to the metal shaft portion 11 by integral molding with the small convex portions 16 idles at the time of fastening. Is prevented. Note that idling can also be prevented by forming knurls on the base 15 or forming the base 15 itself into a polygon such as a square or hexagon. Therefore, as long as idling can be prevented, the shape is not limited at all.

The screw part of the present invention is not limited to the above-described shaft part 11 made of metal such as steel and the head 21 made of resin. As shown in FIG. 1
1 and the head 21 can be made of the same material.
For example, when a high strength such as a high axial force is not required, a screw component can be easily manufactured as an integral unit by pouring a resin into a manufacturing mold and solidifying the resin.
When importance is placed on the strength and mass productivity of the shaft 11, as described above, the shaft 21 is made of metal, and the resin-made head 21 is formed by integral molding. If the head 21 is also to be made of metal, the processing method is slightly complicated. However, the shaft 11 and the head 21 are integrally formed by applying plastic working or cutting to a wire such as steel. It can be a metal screw part.

In the screw component of the present invention as described above, the size of the top surface 23 of the ball-shaped bulging portion 22 is much smaller than the inner diameter of the tightening tool 29 such as a socket wrench, and the working space is small. Even in a narrow case or when visibility is poor, the tightening tool 29 can be easily mounted diagonally on the ball-shaped bulging portion 22, as shown in FIG. In addition,
As shown in the figure, a friction coefficient between the tightening tool 29 and the ball-shaped bulging portion 22 is ensured by providing an uneven pattern 28 such as a lattice at a position where the tightening tool 29 of the ball-shaped bulging portion 22 abuts. The risk of the tightening tool 29 crushing the apex of the polygon of the ball-shaped bulging portion 22 can be reduced.

FIGS. 7 to 12 show screw components according to second to seventh embodiments of the present invention. These screw parts are
It has an inclined side surface 31 formed by enlarging a hexagon formed on the top surface 23 as the engagement portion with the fastening tool so as to expand downward from the tip of the head toward the bottom, and the side surface is inclined. Thereby, the fastening tool can be mounted obliquely. Here, the angle θ between the inclined side surface 31 and the axis 30 is formed at 23.5 °. The screw component according to the second embodiment shown in FIG.
A flank 32 is formed to facilitate mounting at an angle. In the screw component according to the third embodiment shown in FIG. 8, the width of the head 21 can be measured by providing the side surface 33 parallel to the axis 30, so that the dimensional accuracy of the head 21 is managed with high accuracy. can do.

The threaded component according to the fourth embodiment shown in FIG. 9 has a longer inclined side surface 31 and a larger engagement area with the fastening tool 29 to facilitate torque transmission. The screw component according to the fifth embodiment shown in FIG. 10 is an improved version of the screw component according to the fourth embodiment. That is, in the screw component of the fourth embodiment, the fastening tool 29 may bite into the flange portion 34 to damage the flange portion or insufficient torque transmission. Therefore, the side surface 33 parallel to the axis 30 is provided. Each of the threaded components of the second to fifth embodiments, which has a shape that easily transmits torque, has an angle θ between the inclined side surface 31 and the axis 30 formed at 23.5 °. .

A screw part according to a sixth embodiment shown in FIG. 11 is an improved version of the screw part according to the fourth embodiment, wherein the angle θ formed between the inclined side surface 31 and the axis 30 is 9 °. Thus, the contact area between the fastening tool and the inclined side surface 31 is increased. Similarly, the screw component of the seventh embodiment shown in FIG. 12 is an improved version of the screw component of the fifth embodiment,
Again, the angle θ between the inclined side surface 31 and the axis 30 is formed at 9 ° to increase the contact area between the fastening tool and the inclined side surface 31. When θ = 9 °, the fastening tool 29
It is desirable that the engaging portion at the tip of the fastening tool 29 be inclined about 15 ° with respect to the axis of the fastening tool 29 on the side. This makes it possible to fasten the threaded parts with a total inclination angle of 24 °. Note that the angle θ between the inclined side surface 31 and the axis 30 may be any range as long as torque transmission can be performed without delay.
The angle θ is not limited at all.

The screw parts according to the second to seventh embodiments described above have a simpler shape than the screw parts according to the first embodiment having the ball-shaped bulging portion 22, so that one material such as a steel wire is formed by a parts former. , And can be molded as a single unit, thereby improving productivity and reducing costs. Also, there is no problem if the head 21 and the shaft 11 are formed as separate materials. It is needless to say that the cross-sectional shape of the head 21 is not limited to a hexagon as in the first embodiment, but may be a polygon such as a square or an octagon capable of transmitting torque.

[0017]

As described above, the screw part of the present invention expands a polygon such as a hexagon formed on the top surface as an engagement portion with a fastening tool in a divergent shape from the tip of the head downward. By providing the inclined side surface, the inclined side surface guides the fastening tool, so that a fastening tool such as a socket wrench can be easily mounted diagonally. Also, by providing a ball-shaped bulging portion having a polygonal cross section as an engaging portion, and by forming a constricted portion between the ball-shaped bulging portion and the head seat surface, the ball-shaped bulging portion is also provided. The fastening tool can be easily mounted diagonally. Furthermore, since the engaging portion is formed in a polygonal cross section and provided with corners, torque can be easily transmitted by the tightening tool. Therefore, even when the working space is small or visibility is low, the member to be fastened can be easily fastened and fixed to the mounting member, so that there is no need to use expensive tools such as a universal joint and a flex ratchet handle, and There is an advantage that a series of fastening operations such as attachment and detachment of a tool and tightening rotation can be performed smoothly and efficiently.

[Brief description of the drawings]

FIG. 1 is a front view and a plan view of a screw component according to a first embodiment of the present invention.

FIGS. 2A and 2B are a perspective view and a plan view showing details of a head of a screw component according to the first embodiment of the present invention. FIGS.

FIG. 3 is a front view of a main part of the screw component according to the first embodiment of the present invention, which is made of one material.

FIG. 4 is an explanatory view showing a state in which a fastening tool is mounted on the screw component according to the first embodiment of the present invention.

FIG. 5 is an explanatory view showing a state in which a bolt is fastened using a conventional universal joint.

FIG. 6 is an explanatory view showing a state in which a bolt is fastened using a conventional flex ratchet handle.

FIG. 7 is a front view of a main part of a screw component according to a second embodiment of the present invention.

FIG. 8 is a front view of a main part of a screw component according to a third embodiment of the present invention.

FIG. 9 is a front view of a main part of a screw component according to a fourth embodiment of the present invention.

FIG. 10 is a front view of a main part of a screw component according to a fifth embodiment of the present invention.

FIG. 11 is a front view of a main part of a screw component according to a sixth embodiment of the present invention.

FIG. 12 is a front view of a main part of a screw component according to a seventh embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bolt head 2 Socket 3 Universal joint 4 Flex ratchet handle 5 Other members 6 Fastened member 7 Mounting member 8 Bolt 11 Shaft part 13 Thread 14 Shaft head 15 Disk base 16 Small convex part 21 Head Part 22 Ball-shaped bulging part 23 Top surface 24 Maximum bulging part 25 Seat surface 26 Flange part 27 Narrow part 28 Irregular pattern 29 Tightening tool 30 Axis 31 Slant side surface 32 Flank surface 33 Parallel side surface 34 Flange part

Continued on the front page (72) Inventor Hiromichi Mizuno 1-8-8 Takahashi, Oguchi-machi, Niwa-gun, Aichi Prefecture Inside the Oguchi Plant of Aoyama Seisakusho (72) Inventor Yasuhiro Mitsui 1-8-8 Takahashi, Oguchi-machi, Niwa-gun, Aichi Prefecture Aoyama Factory Oguchi Factory

Claims (2)

[Claims] 1. A screw part comprising a shaft part having a thread and a head part provided with an engagement part for a fastening tool,
The polygon formed on the top surface as the engagement portion is provided with an inclined side surface by expanding downwardly from the tip of the head in a divergent shape,
Screw parts characterized in that the fastening tool can be mounted diagonally. 2. A screw component comprising a shaft portion having a thread and a head portion provided with an engaging portion for engaging with a fastening tool,
A ball-shaped bulging portion having a polygonal cross section is provided as the engaging portion, and a constricted portion is formed between the ball-shaped bulging portion and the seating surface so as to allow a diagonal mounting of a fastening tool. Screw parts to do.