JP2017119958A - Chain length adjustment metal fitting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a length adjustment metal fitting for adjusting an effective length of a construction chain which is used in a construction site.SOLUTION: A chain length adjustment metal fitting is composed of a bolt 1, a bolt head-side engagement member 2 and a tip-side engagement member 3, the bolt head-side engagement member 2 is screw-fit to the bolt 1 in a penetration screw hole 10 which is formed at the bolt head-side engagement member 2, the bolt tip-side engagement member 3 is relatively rotatably and loosely fit to the bolt 1 while being retained at a tip of the bolt 1 so as not come off from the bolt 1, and hooks 6 which can make a chain 15 engaged with the bolt head-side engagement member 2 and the bolt tip-side engagement member 3 are arranged at the bolt head-side engagement member and the bolt tip-side engagement member.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a chain length adjusting bracket used at a construction site for suspending a temporary work scaffold or the like and fastening a concrete formwork.

  Chains used at the construction site for suspension of temporary work scaffolds and fastening of concrete formwork, etc., in order to keep what is suspended at a certain height, or to obtain a reliable fastening effect, Chain length adjustment bracket is required. As described in Patent Document 1, this type of chain length adjusting bracket includes a bolt, a bolt head side engaging member, and a bolt tip side engaging member, and the bolt head side engaging member and the bolt. The front end side engaging member is provided with a hook portion that can be engaged with the chain link. The bolt head side engaging member is freely loosely fitted to the bolt. By screwing the bolt in a through screw hole provided in the bolt tip side engaging member and rotating the bolt, the bolt head side engaging member received by the bolt head is bolted. It was comprised so that a front end side engaging member might be drawn near.

JP 2007-284933 A

  In the configuration described in Patent Document 1, when the bolt is rotated and the bolt tip side engaging member is pulled toward the bolt head side engaging member received by the bolt head, On the other hand, since the bolt tip side engaging member moves to the bolt head side, the protruding length of the tip portion of the bolt protruding from the bolt tip side engaging member increases. Accordingly, when the bolt head to be rotated is used with the bolt head being rotated upward, the situation where the height of the bolt tip side engaging member hardly changes, that is, the chain engaged with the hook portion of the bolt tip side engaging member is If the chain engaged with the hook part of the bolt head side engaging member is pulled down without being pulled up so much, the bolt tip part moves downward from the bolt tip side engaging member where the height hardly changes. It will be extended. In order to avoid this inconvenience, there is a possibility that the tip of this bolt will collide with a temporary scaffold or other structure that is going to be suspended by the chain. ) Had to be considered.

  The present invention proposes a chain length adjusting bracket that can solve the conventional problems as described above, and the chain length adjusting bracket according to the present invention is related to the embodiments described later. For ease of understanding, the reference numerals used in the description of the embodiment are shown in parentheses, and the bolt (1), the bolt head side engaging member (2), and the bolt tip side engaging member The bolt head side engaging member (2) is formed by screwing into the bolt (1) in the through screw hole (10) provided in the bolt head side engaging member (2), The side engagement member (3) is loosely fitted to the front end of the bolt (1) so as to be relatively rotatable with respect to the bolt (1) while being prevented from coming off from the bolt (1). The side engagement member (2) and the bolt tip side engagement member (3) are provided with a hook portion (6) that can engage the chain (15). That.

  According to the above-described chain length adjusting bracket of the present invention, the two chain links to be moved toward and away from each other are engaged with the hook portions of the bolt head side engaging member and the bolt tip side engaging member. If the bolt is a positive screw, rotate the bolt head in the screw return direction, and if the bolt is a reverse screw, rotate the bolt head in the screwing direction. The bolt head side engaging member is moved closer to the bolt front side engaging member loosely fitted so as to be relatively rotatable, the two chain links of the chain are moved closer to each other, and the chain is tensioned. It can be made. At this time, since it is common to use the bolt in a vertical direction with the head of the bolt to be rotated upward, in this general use state, the bolt head The part-side engaging member is lowered, and the bolt does not move downward with respect to the bolt tip-side engaging member located on the lower end side of the bolt. Therefore, even if there is an on-site structure such as a temporary scaffold suspended by a chain conveyor that is tensioned by this chain length adjusting bracket, just below the bolt tip side engagement member located at the lower end, As a result of the operation, there is no possibility that the lower end of the descending bolt will collide. For this reason, it is not necessary to consider the place of use (height etc.) of the chain length adjusting bracket, and workability is improved.

  In carrying out the present invention, the bolt head side engaging member (2) is connected to the same side from both sides of the top plate part (7) and the through hole through which the bolt (1) passes ( 11a, 11b) each having a U-shaped body (4) with both side plate portions (8a, 8b), and the hook portion (6) is a top plate of the U-shaped body (4) Are integrally connected from the portion (7), and the through screw hole (10) of the bolt head side engaging member (2) is provided between the side plate portions (8a, 8b) of the U-shaped body (4). The nut (5) is fitted with a through screw hole (10), and the nut (5) includes a top plate portion (7) of the U-shaped body (4) and the both side plate portions (8a, It can be held in a non-rotatable manner by the nut retaining protrusions (9a, 9b) projecting inward from the free ends of 8b). According to this configuration, a through screw hole having a necessary and sufficient length can be easily configured by using a separate nut, and it is not necessary to weld the separate nut to the U-shaped body. Can be implemented.

  In the case of adopting the above configuration, the bolt tip side engaging member (3) is the bolt head (1) obtained by removing the nut (5) from the bolt head side engaging part (2) material in the reverse direction. ) Can be loosely fitted to the tip. According to this configuration, since it is not necessary to prepare two types of engaging members, the present invention can be implemented at a very low cost.

  The bolt (1) must have a tip (12) for retaining the bolt tip side engaging member (3) at the tip of the bolt (1). Protrusions (13a, 13b) formed by caulking the peripheral surface of the tip portion, and a washer (14) rotatably fitted on the bolt (1) inside the protrusions (13a, 13b) I can do it.

FIG. 1 is a side view showing an entire chain length adjusting bracket according to an embodiment of the present invention. FIG. 2 is a right side view of FIG. 3A is a plan view of FIG. 1, and FIG. 3B is a bottom view of FIG. 4A is a cross-sectional view taken along the line XX of FIG. 1, and FIG. 4B is a cross-sectional view taken along the line YY of FIG. FIG. 5 is a side view showing a usage state of the chain length adjusting bracket according to one embodiment of the present invention.

  1-4, 1 is a bolt, 2 is a bolt head side engaging member, 3 is a bolt front end side engaging member. The bolt head side engaging member 2 includes a U-shaped main body 4, a prismatic nut 5, and a hook portion 6. The U-shaped body 4 is formed by bending a thick plate (metal plate), and the top plate portion 7 and both sides parallel to each other that are integrally bent from the front and rear sides to the same side. Plate portions 8 a and 8 b are provided, and the hook portion 6 is integrally connected from one of the left and right sides of the top plate portion 7.

  The prismatic nut 5 is a hexagonal nut whose length in the axial center direction can be just fitted between the both side plate portions 8a and 8b of the U-shaped body 4, and the prismatic nut 5 is mutually connected. Of the pair of parallel outer surfaces 5 a and 5 b, the prismatic nut 5 is connected to the U-shaped body 4 so that one outer surface 5 a is adjacent to the inner surface of the top plate portion 7 of the U-shaped body 4. When fitted between the two side plate portions 8a and 8b, the inner side surface in the vicinity of the end portions of the two side plate portions 8a and 8b of the U-shaped main body 4 is adjacent to both end portions in the axial direction of the other outer side surface 5b. Nuts retaining protrusions 9a and 9b are formed. As shown in FIG. 4A, these nut retaining protrusions 9a and 9b are circular ones formed by extruding the side plate portions 8a and 8b from the outside to the inside. It is good also as a protrusion shape which has substantially the same length as the width | variety (circumferential direction length) of 5b.

  As described above, the side plates 8a and 8b of the U-shaped main body 4 have a center between the side plates 8a and 8b between the top plate 7 and the pair of nut retaining projections 9a and 9b. Through holes 11a and 11b having a slightly larger diameter than the through screw hole 10 are formed so as to be concentric with the through screw hole 10 of the prismatic nut 5 fitted from the side to the position.

  The bolt front end side engaging member 3 is the same as that obtained by removing the prismatic nut 5 from the bolt head side engaging member 2, and both the engaging members 2, 3 are of the U-shaped main body 4. The bolt 1 so that the bolt 1 passes through the through holes 11a, 11b of the U-shaped body 4 in a state opposite to the bolt head side engaging member 2 so that the tips 6a of the hook portions 6 face each other. It is loosely fitted to the tip of 1 so as to be relatively rotatable. At the tip of the bolt 1, a retaining means 12 for preventing the bolt tip side engaging member 3 from coming off the bolt 1 is provided. The retaining means 12 includes two protrusions 13a and 13b on both sides in the diametrical direction formed by caulking the peripheral surface of the tip of the bolt 1, and a flat loosely fitted to the bolt 1 inside the protrusions 13a and 13b. It consists of a washer 14. The bolt 1 may have a normal screw structure, but in this embodiment, a reverse screw structure is used.

As shown in FIG. 5, the chain length adjusting bracket constructed as described above has two chain links located at an appropriate distance from the vertically oriented chain 15 whose effective length is to be reduced. Among the chain links at both ends of the chain 15, the upper chain link is engaged with the hook portion 6 of the bolt head side engaging member 2, and the lower chain link is engaged with the hook portion of the bolt front end engaging member 3. 6 is engaged. Then, the upper end of the bolt 1 in the vertical direction, that is, the head 1a of the bolt 1 projecting upward to the upper bolt head side engaging member 2 is rotated, but the bolt 1 has a reverse screw structure as described above. Therefore, the bolt 1 is rotated in the normal rotation direction which is a normal screwing direction. At this time, the bolt head side engaging member 2 is in a state where it cannot rotate around the bolt 1 by engagement with the chain 15, and the prismatic nut 5 screwed into the bolt 1 is connected to the bolt head side. Since the engagement member 2 is held so as not to rotate, as a result, the bolt 1 having a reverse screw structure rotates in the forward rotation direction with respect to the prismatic nut 5, and the prismatic nut 5 with respect to the bolt 1. That is, the bolt head side engaging member 2 is moved downward away from the head 1 a of the bolt 1. The bolt 1 is in an idle state with respect to the bolt front end engagement member 3, and the bolt front end engagement member 3 is received by the projections 13 a and 13 b on the bolt 1 side via the plain washer 14. It is.

  With the above action, the head 1a positioned at the upper end of the bolt 1 having the reverse screw structure in the vertical direction is rotated at the lower end of the bolt 1 by rotating the head 1a in the normal rotation direction that is a normal screwing direction. The bolt head side engaging member 3 moves downward so that the bolt head side engaging member 2 located on the upper end side of the bolt 1 approaches, and the bolt head side engaging member 2 and Two portions of the chain 15 engaged with the bolt front end engaging member 3 via the hook portion 6 are attracted to each other, and the chain 15 is tensioned. At this time, as shown in FIG. 5, the hook portions 6 of the bolt head side engaging member 2 and the bolt tip side engaging member 3 try to be positioned in a straight line by the tension acting on the chain 15. Therefore, the bolt 1 takes an oblique posture.

  The specific structures of the bolt head side engaging member 2 and the bolt tip side engaging member 3 are not limited to those of the above-described embodiments. Further, the bolt head side engaging member 2 and the bolt tip side engaging member 3 may each have a dedicated structure, but are configured so that the same structure can be used as in the embodiment. Is desirable. Furthermore, contrary to the embodiment, each hook portion 6 can be bent from the top plate portion 7 of the U-shaped main body 4 to the side opposite to the side where the both side plate portions 8a and 8b are provided.

  The chain length adjusting bracket of the present invention can be used as a means for adjusting the effective length of a chain for various uses temporarily used at a construction site.

DESCRIPTION OF SYMBOLS 1 Bolt 2 Bolt head side engaging member 3 Bolt tip side engaging member 4 U-shaped main body 5 Square column type nut 5a, 5b The mutually parallel outer surface of a prismatic type nut 6 Hook part 7 Top plate part of U-shaped main body 8a, 8b Side plate portions of U-shaped body 10 Penetration screw hole 11a, 11b Through hole 12 Retaining means 13a, 13b Protrusion 14 Flat washer 15 Chain

Claims (4)

  A bolt, a bolt head side engaging member, and a bolt tip side engaging member, and the bolt head side engaging member is screwed into the bolt in a through screw hole provided in the bolt head side engaging member, The bolt front end engagement member is loosely fitted to the bolt front end portion so as to be relatively rotatable with respect to the bolt in a state of being prevented from coming off from the bolt, and the bolt head side engagement member and the bolt front end engagement. A chain length adjusting bracket provided with a hook portion that can engage a chain link with the member.   The bolt head side engaging member includes a U-shaped main body provided with both side plate portions that are provided on the same side from both sides of the top plate portion and have through-holes through which the bolt passes, and the hook portion. Is integrally connected from the top plate portion of the U-shaped main body, and the through screw hole of the bolt head side engaging member penetrates a nut fitted between both side plate portions of the U-shaped main body. It is constituted by a screw hole, and the nut is held non-rotatably by a nut retaining protrusion protruding inward from the top plate portion of the U-shaped main body and the free end portions of the both side plate portions. The chain length adjusting bracket according to claim 1.   3. The chain length according to claim 2, wherein the bolt tip side engaging member is loosely fitted to the tip of the bolt in the front-rear direction after the nut is removed from the bolt head side engaging member. Adjustable bracket.   At the tip of the bolt, there is provided a retaining means for the bolt tip side engaging member, the retaining means is a projection formed by caulking the peripheral surface of the tip of the bolt, and inside the projection The chain length adjusting bracket according to any one of claims 1 to 3, wherein the chain length adjusting bracket is configured by a washer loosely fitted to a bolt.

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