JP2007284933A - Metal fitting for adjusting length of chain - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the cost of a metal fitting for adjusting the length of a chain for suspending a temporary work scaffold. <P>SOLUTION: Each of a bolt head side engagement member 2 and a bolt end engagement member 3 is formed by bending the intermediate portion of one sheet of band-like plate in a cylindrical shape. The bolt head side engagement member and the bolt end engagement member comprises cylindrical parts 7, 12 fitted onto a bolt 1 and hook parts 9, 14 formed of the double-folded both end portions 8a, 8b, 13a, 13b of the band-like plate adjacent to each other, respectively. An intermediate recessed part 15 formed by cutting out the axial intermediate portion of the bolt end side engagement member 3 from the opposite side of the side where the hook part 14 is located is formed in the cylindrical part 12 of the bolt end side engagement member. A square nut 11 is so fitted into the intermediate recessed part 15 of a body cylindrical part 12 that the rotation of the square nut 11 can be stopped by the contact of the side 15a of the intermediate recessed part 15 parallel with the axal direction on the outer surface 11a of the square nut 11 and threadingly fitted to the bolt 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a chain length adjusting bracket for hanging a temporary work scaffold or the like.

When a temporary work scaffold is installed under a bridge or an elevated road for painting work or the like, the work scaffold is suspended on a steel frame such as a bridge or an elevated road by a number of chains. In this case, it is necessary to adjust the length of each chain in order to install the work scaffold horizontally and to distribute the load to all the chains (to eliminate the slack chain). As described in Patent Document 1, the chain length adjusting bracket used for such a purpose includes a bolt, a bolt head side engaging member, and a bolt tip side engaging member. Engage the hooks in the opposite direction with the two upper and lower links of the chain, rotate the bolt in the screwing direction and move the bolt tip side engagement member to the bolt head side engagement member to shorten the chain Chain length adjustment fittings that adjust the length in the direction are known. The conventional chain length adjusting bracket as described in Patent Document 1 has a problem that the structure of each engaging member is complicated or welding is required, and the manufacturing cost is high.
JP 2006-70572 A

  However, the conventional chain length adjusting bracket described in Patent Document 1 has a problem that the structure of each engaging member is complicated or requires welding, and the manufacturing cost is high. It was.

  The present invention aims to provide a chain length adjusting bracket capable of solving the conventional problems as described above, and its means is shown with reference numerals of embodiments described later. The bolt head side engagement member 2 is composed of a bolt 1, a bolt head side engagement member 2, and a bolt tip side engagement member 3. The bolt head side engagement member 2 is formed by bending an intermediate portion of one belt-like plate into a cylindrical shape and It is composed of a cylindrical portion 7 that is externally fitted to the bolt 1 and a hook portion 9 that is formed by two overlapping end portions 8a and 8b that are adjacent to each other of the belt-like plate and whose tip is directed to the tip side of the bolt 1. The bolt tip side engaging member 3 is composed of a main body 10 and a square nut 11, and the main body 10 is formed by bending an intermediate portion of a single belt-like plate into a cylindrical shape, and a cylindrical portion 12 that is externally fitted to the bolt 1. And two overlapped end portions 13a and 13b adjacent to each other of the belt-like plate. And a hook portion 14 whose tip is directed toward the bolt head 4 side, and the cylindrical portion 12 is formed by notching an intermediate portion in the axial direction from the side opposite to the side having the hook portion 14. The intermediate nut 15 is provided, and the square nut 11 is brought into contact with the intermediate concave portion 15 of the main body cylindrical portion 12 between the side 15 a parallel to the axial direction of the intermediate concave portion 15 and the outer surface 11 a of the square nut 11. Accordingly, the square nut 11 is fitted in a state in which the rotation of the square nut 11 is prevented and is screwed into the bolt 1.

  In carrying out the present invention having the above-described configuration, specifically, as the bolt head side engaging member 2, the same one as the main body 10 of the bolt tip side engaging member 3 is used as described in claim 2. be able to. In this case, as described in claim 3, the bolt 1 is loosely fitted into the intermediate recess 16 in the same body 10 of the bolt tip side engaging member 3 used as the bolt head side engaging member 2. The pipe material 17 can be fitted.

  The chain length adjusting bracket according to the present invention having the above-described configuration is a chain whose length is to be adjusted in the shortening direction, for example, among the many chains that suspend the work scaffold, at the upper and lower two links of the slack chain. By engaging the hook part of the bolt head side engaging member and the hook part of the bolt leading end side engaging member and rotating the bolt in the screwing direction to move both engaging members relatively close to each other, However, according to the configuration of the present invention, the bolt head side engaging member can be obtained only by punching and bending one strip-shaped plate. The bolt front side engaging member is configured by simply screwing and inserting the bolt in a state in which a square nut is fitted in an intermediate concave portion of the main body that can be configured only by punching and bending one strip-shaped plate. It is possible, It is possible to achieve an overall significant cost reduction compared to contact and that of the press working a conventional need for complex shapes.

  In particular, according to the configuration of the second aspect, since the same body as the main body of the bolt front end side engaging member can be used as it is as the bolt head side engaging member, two types of engaging members must be manufactured. Compared to the case, the cost can be further reduced. In this case, according to the configuration described in claim 3, the axial play of the pipe member fitted into the intermediate recess of the cylindrical portion of the bolt head side engaging member is almost zero or reduced. Just considering the axial length of the pipe material, a deformation that causes the cylindrical parts on both sides in the axial direction of the intermediate recess to move closer to each other due to the reaction force during chain tensioning operation is fitted into the intermediate recess. Can be blocked by the pipe material that has been used, while using the same body as the bolt tip side engagement member as it is as the bolt head side engagement member, it is possible to eliminate problems in strength and improve safety. Can be increased.

  Specific embodiments of the present invention will be described below with reference to the accompanying drawings. In the first embodiment shown in FIGS. 1 to 3, 1 is a bolt, 2 is a bolt head side engaging member, and 3 is a bolt front end side. It is an engaging member. The head 4 integrally formed at one end of the bolt 1 may be a general hexagonal or quadrangular square head, but the illustrated one includes a through-hole 5 penetrating in the diameter direction. The bolt 1 can be rotated by inserting a rod-shaped tool such as a screwdriver or the tip of a steel round bar cut into an appropriate length into the through-hole 5. Note that a washer 6 is loosely fitted to the bolt 1 in a small diameter shaft portion between the head 4 and the screw shaft portion 1a. The washer 6 may be mounted with an inner diameter slightly larger than the outer diameter of the screw shaft portion 1a by being fitted and moved from the tip of the screw shaft portion 1a, or through the screw shaft portion 1a. A screw hole may be screwed and moved from the tip of the screw shaft portion 1a and loosely fitted to the small diameter shaft portion.

  The bolt head side engaging member 2 is formed by bending an intermediate portion of a single belt-like plate into a cylindrical shape, and a cylindrical portion 7 that is externally fitted to the bolt 1, and a two-layer stack of the belt-like plates adjacent to each other. The hook portion 9 is formed by both end portions 8a and 8b and the tip 9a faces the tip side of the bolt 1 (the side opposite to the side where the head 4 is located).

  The bolt front end engaging member 3 is composed of a main body 10 and a square nut 11, and the main body 10 is formed by bending an intermediate portion of one belt-like plate into a cylindrical shape and is externally fitted to the screw shaft portion 1 a of the bolt 1. A cylindrical portion 12 and a hook portion 14 formed of two overlapping end portions 13a and 13b adjacent to each other of the belt-like plate and having a tip 14a facing the bolt head 4 side. The portion 12 is provided with an intermediate recess 15 formed by cutting an axial intermediate portion from the side opposite to the side where the hook portion 14 is provided, and the square nut 11 may be a general hexagon nut (a square nut may be used). ) And is fitted into the intermediate recess 15 of the main body cylindrical portion 12 in a state where one side surface 11a of the square nut 11 is adjacent to one side 15a parallel to the axial direction of the intermediate recess 15. , The screw 1a of the bolt 1 is passed through the square nut 11 While screwed through the hole 11b is obtained by inserting into the body tubular portion 12. Thus, the relative rotation of the square nut 11 around the screw shaft portion 1a of the bolt 1 with respect to the main body cylindrical portion 12 is parallel to the side surface 11a of the square nut 11 and the axial direction of the intermediate recess 15. The depth of the intermediate recess 15 is set so as to be blocked by contact with the side 15a.

  As is apparent from the drawing, specifically, the main body 10 of the bolt tip side engaging member 3 is formed by forming an intermediate recess 15 in the cylindrical portion 7 in the same thing as the bolt head side engaging member 2. This is used in the opposite direction to the bolt head side engaging member 2.

  The chain length adjusting bracket configured as described above can be used in the same manner as the conventional one. That is, the hook portion 9 of the bolt head side engaging member 2 is connected to two links on the upper and lower sides of a chain whose length is to be adjusted in a shortening direction, for example, a number of chains that suspend the work scaffold. And the main body hook portion 14 of the bolt front end engaging member 3 are engaged, and the bolt 1 is rotated in the screwing direction to move the engaging members 2 and 3 closer to each other. The chain can be tensioned by pulling them together. At this time, the rotation of the square nut 11 around the bolt screw shaft portion 1a with respect to the main body 10 of the bolt tip side engaging member 3 engaged with the chain is intermediate between the one side surface 11a of the square nut 11 and the middle. Since it is prevented by contact with one side 15a parallel to the axial direction of the recess 15, the bolt head side engaging member 3 is securely connected to the bolt head via the square nut 11 by rotating in the screwing direction of the bolt 1. The side engaging member 2 can be moved closer to Nogawa. Note that the end surface of the bolt head side engaging member 2 on the bolt head 4 side is received by the inner end surface of the bolt head 4 via the washer 6.

  In the above-described use, the bolt 1 is rotated in the unscrewing direction in advance to move the engaging members 2 and 3 away from each other, thereby widening the distance between the hook portions 9 and 14 of the engaging members 2 and 3. . And in the state before use, since the bolt head side engaging member 2 can move loosely in the axial direction of the bolt 1 between the head 4 of the bolt 1 and the bolt front end side engaging member 3, the bolt head When engaging the chain with the side engagement member 2 facing upward, the operation of engaging the hook portions 9 and 14 of the both engagement members 2 and 3 with the chain link by holding the bolt head side engagement member 2. The bolt head side engaging member 2 is received by the bolt head 4 via the washer 6 when the bolt tip side engaging member 3 is engaged with the chain. Then, it is possible to perform an operation of engaging the hook portions 9 and 14 of the engaging members 2 and 3 with the chain link with any appropriate place.

  In the second embodiment shown in FIG. 4, the bolt head side engaging member 2 is the same as the main body 10 of the bolt tip side engaging member 3, that is, the main body 10 formed by forming the intermediate recess 15 in the cylindrical portion 7. Is used in the opposite direction to the bolt tip side engaging member 3. Therefore, the cylindrical portion 7 of the bolt head side engaging member 2 is provided with an intermediate concave portion 16 formed by cutting an axial intermediate portion from the side opposite to the side where the hook portion 9 is provided.

  In the third embodiment shown in FIGS. 5 and 6, a pipe material 17 is fitted into the intermediate recess 16 of the tubular portion 7 of the bolt head side engaging member 2 in the second embodiment shown in FIG. 4. This pipe material 17 is obtained by cutting a round pipe material having substantially the same inner diameter and outer diameter as the cylindrical portion 7 into a length slightly smaller than the axial inner width of the intermediate recess 16. The screw shaft 1a of the bolt 1 is inserted through the cylindrical portions 7a and 7b divided into two in the axial direction by the intermediate recess 16 and the pipe member 17 in a state in which the recess 16 is concentrically fitted. . According to this embodiment, the cylindrical portions 7a and 7b on both sides of the intermediate recess 16 are deformed so as to approach each other by the axial compression reaction force acting on the tubular portion 7 from the hook portion 9 when using the chain tension. Can be prevented by the pipe material 17.

  In addition, the two overlapping end portions 8a, 8b, 13a, 13b of the belt-like plates constituting the hook portions 9, 14 of the engaging members 2, 3 in each embodiment may be overlapped so as to contact each other, It may be arranged in parallel with an appropriate small gap as shown. Further, when the hook portions 9 and 14 are formed by overlapping the two overlapping end portions 8a, 8b, 13a, and 13b of the belt-like plate so as to contact each other, the two overlapping end portions 8a, 8b, It is also possible to fix 13a and 13b by welding to each other.

Fig. A is a side view showing the first embodiment, and Fig. B is an exploded perspective view of a bolt tip side engaging member in the same embodiment. It is a top view of embodiment same as the above. FIG. 1A is a sectional view taken along line AA in FIG. 1A, and FIG. B is a sectional view taken along line BB in FIG. 1A. It is a side view which shows 2nd embodiment. It is a side view which shows 3rd embodiment. It is a disassembled perspective view of the bolt head side engaging member in embodiment same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bolt 1a Screw screw part 2 Bolt head side engaging member 3 Bolt tip side engaging member 4 Bolt head 5 Bolt head through-hole 6 Washer 7, 12 Cylindrical part 7a, 7b Cylindrical part 8a, 8b, 13a, 13b Two overlapping end portions 9, 14 of hook-like plates 9, 14a Hook end 10 Main body 11 of the bolt end side engaging member Square nut 11a Square nut one side surface 15, 16 Intermediate recess 15a Intermediate recess 1 Side 17 Pipe material

Claims (3)

    It consists of a bolt, a bolt head side engaging member, and a bolt tip side engaging member. The bolt head side engaging member is formed by bending an intermediate portion of one belt-like plate into a cylindrical shape and is fitted to the bolt. And a hook portion formed by two overlapping end portions adjacent to each other of the belt-like plate and having a tip directed toward the bolt tip side. The bolt tip side engaging member includes a main body and a square nut. The main body is formed of a cylindrical portion that is formed by bending an intermediate portion of a single belt-like plate into a cylindrical shape and that is externally fitted to a bolt, and two overlapping end portions that are adjacent to each other of the belt-like plate. In addition, the cylindrical portion is formed with an intermediate recess formed by cutting away an axial intermediate portion from the side opposite to the side having the hook portion. The square nut is provided in the intermediate concave portion of the main body cylindrical portion. The contact between the direction and the outer surface of the parallel sides and corners nuts are screwed on the bolt while engaged in a state in which rotation of the angle nut is prevented, thien length adjustment fitting.   The chain length adjusting metal fitting according to claim 1, wherein the bolt head side engaging member is the same as the main body of the bolt front end side engaging member. The chain length according to claim 2, wherein a pipe material loosely fitted to the bolt is fitted into an intermediate recess in the same body as the main body of the bolt tip side engaging member used as the bolt head side engaging member. Adjustable bracket.

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