JP2011208734A - Widened fastening screw - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fasten, by fastening of a bolt of a widened fastening screw, without using any spacial tool.SOLUTION: The widened fastening screw is constituted by putting a cap 2 and a holder 3 onto the bolt 1. The cap 2 includes a cap body 21, cap leg parts 23, a disc washer 22 with claw connected to an upper part of the cap body 21, and rubber packing 24 put onto the cap body 21 to penetrate the cap body 21. The cap body 21 is cylindrical body, and has the cap leg parts 23 formed by extending the cylindrical body downward, slitting the extended part to form a plurality of long strips, and tilting the strips to be close to a central axis of the cylindrical body. The holder 3 includes: a holder body 31 of a cylindrical body; and holder leg parts 32 formed by extending the holder body 31 upward, slitting the extended cylindrical body to form a plurality of long strips. A cylindrical nut 33 screwed with the bolt 1 is disposed to a lower end part of the cylindrical body of the holder body 31.

Description

The present invention relates to an expansion fastening screw that does not require a special tool and enables construction from one side when connecting and fastening a plurality of plate members.

  As an expansion fastening screw, as in Patent Document 1, etc., it is composed of a long bolt and an expansion portion that expands to fasten a plurality of plate materials. When fastening a plurality of plate materials, etc., After the expansion fastening screw is passed, the expansion portion is bent in advance with a dedicated tool and expanded so as to come into contact with the plate material, and then tightened with a bolt. Thus, in the conventional expansion fastening screw, a special tool is required to open the expansion portion.

JP 2004-144278 A

Tighten by tightening the bolt of the expansion fastening screw without using a special tool.

An expansion fastening screw in which a cap 2 is inserted through a long bolt 1 and a holder 3 is screwed. The cap 2 includes a cap body 21, a cap leg 23, and an upper portion of the cap body 21. And a rubber packing 24 inserted into and penetrated into the cap body 21, and the cap body 21 is a cylindrical body, and the cylindrical body is extended downward to make a long cut. A plurality of elongated pieces are formed, and each of the elongated pieces is provided with a cap leg portion 23 that is inclined so as to approach the central axis of the cylindrical body. The holder 3 includes a holder body 31 that is a cylindrical body, and a holder body 31. A cylindrical body obtained by vertically extending the cylindrical body is formed with a holder leg portion 32 which is a plurality of elongated pieces, and a bolt 1 is attached to the lower end portion of the cylindrical body of the holder body 31. Screwed together When a cylindrical nut 33 is provided and fastened, a through hole is provided in the fastening object, an expansion fastening screw is passed through the through hole, and the bolt 1 is continuously rotated and tightened. The body 31 is raised, the holder leg 32 is in contact with the inclination of the cap leg 23, the holder leg 32 abuts, spreads outward in a circular shape, supports the object to be fastened, and the object to be fastened is clawed. It is an expansion fastening screw characterized by fastening a fastening object by pinching with a washer 22.

  It is an expansion fastening screw with high workability that does not require the use of a dedicated tool for fastening plate members together and does not require a considerable force.

The block diagram of the expansion fastening screw of this invention. (a) The holder is closed (b) The holder is open The construction drawing of the expansion fastening screw of the present invention.

FIG. 1 shows a configuration diagram of an expansion fastening screw of the present invention.
The expansion fastening screw of the present invention is an expansion fastening screw in which a cap 2 is inserted through a long bolt 1 and a holder 3 is screwed. An expansion fastening screw in which a cap 2 is inserted through a long bolt 1 and a holder 3 is screwed. The cap 2 includes a cap body 21, a cap leg portion 23, a disk-shaped claw washer 22 connected to the upper portion of the cap body 21, and a rubber packing 24 inserted into the cap body 21. The cap body 21 is a cylindrical body, and the cylindrical body is extended downward. A long slit is formed to form a plurality of elongated pieces, and each elongated piece is inclined so as to approach the central axis of the cylindrical body. The cap leg 23 is provided.

The holder 3 includes a holder body 31 that is a cylindrical body, and holder legs 32 that are a plurality of elongated pieces obtained by making a long cut into a cylindrical body obtained by extending the cylindrical body of the holder body 31 upward. Become. A cylindrical nut 33 that is screwed into the bolt 1 is provided at the lower end of the cylindrical body of the holder body 31. When fastening objects such as a plurality of steel plates, through holes are provided in the fastening objects. When an expansion fastening screw is passed through the through hole and the bolt 1 is continuously rotated and tightened, the holder body 31 rises due to the screwing of the cylindrical nut 33, and the holder leg 32 moves along the inclination of the cap leg 23. The holder leg 32 abuts, spreads outward in a circular shape, hits the object to be fastened, a plurality of strips that are cap leg parts 23 support the object to be fastened, and the object to be fastened is sandwiched between washers 22 with claws. The fastening object is fastened. The bolt 1 is made up of a bolt head 11 and a bolt screw part 12 with a screw. The bolt screw portion 12 is screwed into a cylindrical nut 33 provided at the lower end portion of the cylindrical body of the holder body 31.

FIG. 1A shows an expanding fastening screw in which the cap 2 and the holder 3 are passed through the bolt 1 and screwed together with a nut 33 of the holder 3 so that the holder 3 is closed.
1 (b), from the state of FIG. 1 (a), further turn the bolt head of the bolt 1 with a screwdriver or the like to screw the screw portion 12 of the bolt 1 and the nut 33 of the holder 3 together. Thus, the holder body 31 is raised, the holder leg 32 abuts along the inclination of the cap leg 23, the holder leg 32 abuts, and the plurality of holder legs 32 expand outward in a circular shape. . A plurality of holder leg portions 32 spreading outward in a circular shape fasten a fastening object such as a plurality of plates by the washer 22 with a claw of the cap body 21 and the holder leg portion 32.
As materials for the cap 2 and the holder 3 of the expansion fastening screw of the present invention, materials such as iron and resin are selected and used depending on the hardness of the fastening object.

FIG. 2 is a construction diagram of the expansion fastening screw of the present invention.
FIG. 2 shows an implementation example in which two plates A and B are connected and fastened with the expansion fastening screw of the present invention.
First, the plate A and the plate B are combined and a through hole is provided at a position where the expansion fastening screw is passed. Or about the board A and the board B which opened the hole of the same magnitude | size previously, a shaft of a hole is match | combined and a through-hole is comprised.
First, when the expansion fastening screw is passed through the through hole and tightened while rotating the bolt 1, the cap leg 23 and the holder leg 32 come into contact with each other, and when the bolt 1 is tightened while rotating, the cap leg 23 The holder leg 32 abuts against the inclination of the holder, and the holder leg 32, which is a plurality of elongated pieces, extends outward in a circular shape along the inclination, and the expanded holder leg 32 hits the plate B (FIG. 2). C), supporting the plate B. The plate A and the plate B are fastened by the holder leg portion 32 that has come into contact with the plate B and the washer 22 with claws of the cap body 21. At this time, the holder leg 32 and the cap leg 23 are in contact with D in FIG. The two plates A and B are fastened to all the through holes opened in the two plates A and B by using the expansion fastening screws in the same manner as described above.
Note that the plurality of plates that are fastening objects may be steel plates, wood plates, resin, or combinations thereof.

With the expansion fastening screw of the present invention, when fastening a plurality of plate members, the plate member can be fastened by tightening the bolts only from one side without using a dedicated tool.

DESCRIPTION OF SYMBOLS 1 Bolt 11 Bolt head 12 Bolt screw part 2 Cap 21 Cap body 22 Washer with nail | claw 23 Cap leg part 24 Rubber packing 3 Holder 31 Holder body 32 Holder leg part
321 Holder leg groove 33 Cylindrical nut A, B Plate C Holder leg 32 and plate B contact D Cap leg 23 and holder leg 32 contact

Claims (1)

An expansion fastening screw in which a cap 2 is inserted through a long bolt 1 and a holder 3 is screwed. The cap 2 includes a cap body 21, a cap leg 23, and an upper portion of the cap body 21. And a rubber packing 24 inserted into and penetrated into the cap body 21, and the cap body 21 is a cylindrical body, and the cylindrical body is extended downward to make a long cut. A plurality of elongated pieces are formed, and each of the elongated pieces is provided with a cap leg portion 23 that is inclined so as to approach the central axis of the cylindrical body. The holder 3 includes a holder body 31 that is a cylindrical body, and a holder body 31. A cylindrical leg obtained by extending the cylindrical body in an upward direction, and a holder leg 32 which is a plurality of elongated pieces by making a long cut.
A cylindrical nut 33 to be screwed with the bolt 1 is provided at the lower end of the cylindrical body of the holder body 31. When fastening, a through hole is provided in the object to be fastened, and an expansion fastening screw is passed through the through hole. 1 is rotated and tightened, the holder body 31 is raised by the screwing of the cylindrical nut 33, the holder leg 32 is brought into contact with the inclination of the cap leg 23, and the holder leg 32 is brought into contact with the outer circumference in a circular shape. An expanding fastening screw characterized by spreading in a direction, supporting and supporting a fastening object, and fastening the fastening object by sandwiching the fastening object with a claw washer 22.

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