JP4807827B2 - Chain hanging tool - Google Patents

Description

  The present invention relates to a chain hanging tool used when, for example, a temporary scaffold is suspended under a bridge, and more particularly to a mounting structure thereof.

  Patent literature cannot be exemplified as a chain hanger, but the first U-shaped member and the second U-shaped member are parallel side plates of the other U-shaped member between the parallel side plates of one U-shaped member. In a state in which the parts are fitted to each other, they are connected to each other by pivots that penetrate the respective parallel side plate parts, and a mounting screw shaft projects from the bottom plate part of the first U-shaped member, There are known ones in which a chain hanging portion is formed at the bottom plate portion of the U-shaped member, and those in which a chain hanging means separately configured is attached to the bottom plate portion of the second U-shaped member. In this type of chain suspension, the screw shaft is fixed to the first U-shaped member so as not to rotate, and when mounting, the first U-shaped member and / or the second U-shaped member are grasped. By rotating the entire shaft including the screw shaft, the screw shaft is screwed into a screw hole provided at a location to be attached. Therefore, when the screw shaft is constituted by a bolt, the head of the bolt inserted from the inside through a through hole provided in the bottom plate portion of the first U-shaped member is welded to the bottom plate portion of the first U-shaped member. The bolt is fixed by caulking, or the bolt head is sandwiched between the parallel side plates of the first U-shaped member to stop the rotation of the bolt.

  In the conventional chain hanging tool as described above, when the mounting screw shaft is constituted by a bolt, the manufacturing cost is high when welding or caulking to the bolt head is used to prevent the bolt from rotating. When adopting a structure in which the head is sandwiched between parallel parallel plate parts of the first U-shaped member, manufacturing costs can be reduced, but welding or caulking to the bolt head is used to prevent the bolt from rotating. Similarly, since the entire chain suspension cannot be rotated with respect to the bolt in the attached state, the bottom plate portion (chain suspended portion) of the second U-shaped member or the chain suspension means coupled thereto is used. The orientation will be fixed. Therefore, there is a problem that the bolt cannot be completely tightened in order to attach it in accordance with the tension direction of the suspended chain. Of course, the space between the parallel side plates of the first U-shaped member is sufficiently widened, and the bolt is not fixed to the bottom plate of the first U-shaped member. If it is configured so that it can be mounted by rotating, it is possible to attach the chain suspension firmly according to the tension direction of the chain to be suspended. The U-shaped member becomes large, and in this respect the cost increase is inevitable.

  An object of the present invention is to provide an attachment structure such as a chain suspension that can solve the above-described conventional problems, and the means is described in parentheses with reference numerals of embodiments to be described later. As shown, the first U-shaped member (1) and the second U-shaped member (2) are connected to the other U-shaped member (6) between the parallel side plates (6) of one U-shaped member (1). In the state in which the parallel side plates (9) of 2) are fitted to each other, they are connected to each other by pivots (3) passing through the parallel side plates (6, 9) so that they can swing relative to each other. A mounting screw shaft (4) is projected from the bottom plate portion (5) of the member (1), and a chain hanging portion (8) is formed at the bottom plate portion of the second U-shaped member (2), or the first In the chain hanging device in which the chain suspension means (20) separately configured on the bottom plate portion of the two-shaped member (2) is attached, the parallel both side plate portions (9) of the second U-shaped member (2) Of the parallel side plates (6) of the U-shaped member (1) The screw shaft (4) is located on the side, and the bolt (13) having a square head (14) having two parallel sides (14a, 14b) is connected to the bottom plate portion (5) of the first U-shaped member (1). The second U-shaped member (2) is configured to pass through the through-hole (7) provided on the inner side so as to be capable of rotating from the inside, and the supporting shaft through-hole (10) provided in any one of the U-shaped members. Are formed so that they can be inserted into and removed from the first U-shaped member (1), and the distal ends of the parallel side plates (9) of the second U-shaped member (2) A bolt head that clamps the parallel two sides (14a, 14b) of the square head (14) of the bolt (13) when the two-shaped member (2) enters the first U-shaped member (1). It is formed in the part clamping part (16).

  In carrying out the present invention having the above-described configuration, specifically, as described in claim 2, the bolt head clamping portion (16) at the tip of the parallel side plate portions (9) of the second U-shaped member (2). The end edge (16a) can be formed in a protruding arc shape.

  According to a third aspect of the present invention, the bolt (13) includes a large diameter shaft portion (31) having an axial thickness larger than the thickness of the bottom plate portion (5) of the first U-shaped member (1). Is provided between the screw shaft portion (13a) and the head portion (14) to form a stepped bolt, and the first U-shaped member (1) is attached to the large diameter shaft portion (31) of the bolt (13) in the attached state. It can be configured to be able to rotate around.

  According to the structure of the mounting portion such as the chain suspension according to the present invention having the above-described configuration, when mounting, the bolt is rotated so that the parallel two sides of the square head are parallel to the parallel side plates of the second U-shaped member. The second U-shaped member is inserted into the first U-shaped member in a state of being oriented, and the bolt head clamping portion at the tip of the parallel both side plate portions of the second U-shaped member is parallel to the square head of the bolt. By clamping the side, the bolt (mounting screw shaft) is fixed so that it cannot rotate with respect to the second U-shaped member, and at least one of the first U-shaped member and the second U-shaped member is gripped. Since the (mounting screw shaft) can be rotated, the mounting operation can be performed easily and quickly without using a spanner or the like. In addition, the direction of the second U-shaped member (the direction of the chain hanging tool) at the time of completion of bolt tightening is estimated immediately before the completion of bolt tightening. Remove the bolt (mounting screw shaft) by once withdrawing the second U-shaped member from the one-shaped member and detaching the bolt head clamping part at the tip of the parallel side plates from the square head of the bolt. Rotate the entire chain suspension around the bolt (mounting screw shaft), and when the bolt tightening is completed, the direction of the second U-shaped member (the direction of the chain suspension) is approximately the same as the tension direction of the chain to be suspended. In the state adjusted so that the second U-shaped member is again entered into the first U-shaped member to integrate the bolt head and the second U-shaped member, the final stage of bolt tightening is performed. Can be executed. As a result, the chain suspender can be securely attached in a state in which the chain suspender is suspended in the direction in which the chain can be suspended, and can be used safely and stably. Also, the overall structure is extremely simple and can be implemented at low cost.

  According to the configuration of the second aspect, when the second U-shaped member is advanced into the first U-shaped member, the bolt head is clamped at the ends of the parallel side plates of the second U-shaped member. Not only is it easy to externally fit the part to the parallel two sides of the square head of the bolt, but also during the rotation operation with the bolt head clamping part fitted to the parallel two sides of the square head of the bolt, Even in a situation where the second U-shaped member slightly swings around the support shaft with respect to the first U-shaped member, the rotation operation can be performed relatively smoothly.

  Moreover, according to the structure of Claim 3, even if it fully tightens a bolt at the time of attachment, since the 1st U-shaped member can be rotated around the large diameter axial part of the said bolt, it is ensured. , It is not necessary to adjust the relative angle between the bolt and the first U-shaped member by estimating the direction of the second U-shaped member (the direction of the chain hanger) at the time of bolt tightening immediately before completing the bolt tightening. Although it can be performed easily and easily, it can be used in a state in which the chain suspension is always oriented in the direction in which the chain is suspended.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the accompanying drawings. In FIGS. 1 to 3, 1 is a first U-shaped member, 2 is a second U-shaped member, 3 is a both U-shaped members 1, 2 4 and 4 are mounting screw shafts. The first U-shaped member 1 is formed by bending parallel both side plate portions 6 from the left and right sides of the bottom plate portion 5, and has a through hole 7 at the center position of the bottom plate portion 5. The second U-shaped member 2 is formed by bending a belt-like plate into a U-shape. The U-turn portion is formed on the chain suspension portion 8 and the parallel both side plate portions 9 are parallel both sides of the first U-shaped member 1. It is comprised inside the plate part 6 at an interval that can be loosely fitted in a state adjacent to the inner side surfaces of the parallel side plate parts 6, and the second U-shaped member 2 is positioned near the tip of the parallel side plate parts 9. A support shaft penetrating long hole 10 made of a long hole long in the length direction of the (parallel both side plate portions 9) is provided. The support shaft 3 is a parallel both-side plate portion 9 of the second U-shaped member 2 that is loosely fitted between the support shaft through hole provided in the parallel both-side plate portion 6 of the first U-shaped member 1 and the parallel both-side plate portion 6. The bolt 11 that penetrates the long shaft 10 and the retaining nut 12 are configured.

  The mounting screw shaft 4 is composed of a bolt 13 inserted through a through-hole 7 provided in the bottom plate portion 5 of the first U-shaped member 1 outward from the inside of the bottom plate portion 5, and the hexagonal head portion 14 thereof is In the state that it can rotate between the parallel both side plate portions 9 of the first U-shaped member 1 and the parallel two side sides 14a and 14b are parallel to the parallel both side plate portions 6 of the first U-shaped member 1. Between the parallel two sides 14a and 14b and the inner side surface of the parallel side plates 6 is formed a gap portion 15 into which the front ends of the parallel side plates 9 of the second U-shaped member 2 can enter. It is configured. The bolt 13 has a hexagonal head 14 of the second U-shaped member 2 in a state where the first U-shaped member 1 and the second U-shaped member 2 are connected by the support shaft 3 (bolt 11). It is of a length that abuts against the tips of the parallel side plate portions 6 or abuts against the support shaft 3 (bolt 11) and does not come out of the first U-shaped member 1 from the through hole 7.

  As shown in FIGS. 1 and 2, the second U-shaped member 2 is formed by pulling the bolt 13 (mounting screw shaft 4) and the second U-shaped member 2 in opposite directions to each other, 14 is brought into contact with the inner surface of the bottom plate portion 5 of the first U-shaped member 1 and the support shaft 3 (bolt 11) is connected to the outer end of the support shaft through-hole 10 (the end opposite to the side where the chain suspension portion 8 is located). ) Are in contact with each other, the tips of the parallel side plate portions 9 of the second U-shaped member 2 are in positions that do not overlap the hexagonal heads 14 of the bolts 13 (positions slightly apart). The distal end portion of the parallel both side plate portions 9 of the second U-shaped member 2 is configured as a bolt head clamping portion 16 having an edge 16a formed in a protruding arc shape.

  When using the chain hanger having the above-described configuration, as shown in FIGS. 1 to 3, the bolt 13 is rotated so that the parallel two sides 14 a and 14 b of the hexagonal head 14 are parallel to the first U-shaped member 1. The first U-shaped member 1 and the second U-shaped member 2 are relative to each other within the free-running range of the support shaft 3 (bolt 11) in the support shaft penetrating long hole 10 in a state parallel to the both side plate portions 6. 4, as shown in FIG. 4, a first portion is formed in the gap 15 between the parallel two sides 14 a and 14 b of the hexagonal head 14 of the bolt 13 and the parallel both side plates 6 of the first U-shaped member 1. The pair of left and right bolt head clamping portions 16 of the double-shaped member 2 are fitted, and the hexagonal heads 14 of the bolts 13 are sandwiched between the bolt head clamping portions 16. At this time, as shown in the figure, the bolt 13 may be pushed into the first U-shaped member 1 in advance until the hexagonal head 14 is received by the support shaft 3 (bolt nut 1).

  In the above state, the rotation of the bolt 13 relative to the chain hanger body 17 composed of the first U-shaped member 1 and the second U-shaped member 2 causes the hexagonal head 14 to be a pair of left and right bolts of the second U-shaped member 2. Since it is blocked by being clamped by the head clamping unit 16 and is capable of rotating only together with the chain hanger body 17, the chain hanger body 17 is grasped and the chain hanger body. The chain hanger body 17 can be attached by rotating the bolt 13 together with the screw 17 in the screwing direction and screwing it into the screw hole 18 at the attachment target location. At this time, the bolt 13 is pulled out from the bottom plate portion 5 of the first U-shaped member 1 in accordance with the operation of screwing the bolt 13 into the screw hole 18 of the attachment target portion, and when the screwing is completed, the hexagonal head 14 of the bolt 13 is moved. The bottom plate portion 5 of the first U-shaped member 1 is sandwiched and fixed with the surface of the attachment target portion.

  When the installation of the chain suspension main body 17 is completed, when the screw 13 is adjusted so that the first U-shaped member 1 (the chain suspension main body 17) can rotate around the bolt 13, When a temporary work scaffolding or the like is suspended by a suspension rope such as a chain or a wire rope passed through the chain suspension portion 8 of the two-shaped member 2, the chain suspension body 17 is centered on the bolt 13 by the tension of the suspension rope. While rotating, the second U-shaped member 2 swings around the support shaft 3 so that the second U-shaped member 2 automatically faces in the tension direction of the suspension rope. The second U-shaped member 2 is separated from the first U-shaped member 1 by gravity when the grip for the mounting operation is released, by an artificial pulling operation, or by a tension by a suspension rope, As shown in FIGS. 1 and 2, the support shaft 3 (bolt 11) is in contact with the outer end of the support shaft penetrating long hole 10, that is, the left and right sides of the second U-shaped member 2 from the hexagonal head 14 of the bolt 13. The pair of bolt head clamping portions 16 returns to a separated state.

  When the bolt 13 is completely tightened and the first U-shaped member 1 is firmly fixed, the direction of the chain suspension portion 8 of the second U-shaped member 2 may be adjusted immediately before the complete screwing of the bolt 13 is completed. That is, since the direction of the chain suspension portion 8 of the second U-shaped member 2 when the bolt 13 is completely screwed can be estimated immediately before the complete screwing of the bolt 13 is completed, the direction of the second U-shaped member 2 estimated at this time is estimated. When the direction of the chain suspension portion 8 is greatly different from the tension direction of the suspension rope, the second U-shaped member 2 is once operated to be separated from the first U-shaped member 1, and the hexagonal head 14 of the bolt 13 is removed. The pair of left and right bolt head clamping portions 16 of the second U-shaped member 2 are separated from each other, and the chain suspension body 17 is rotated around the bolt 13 in such a state, and the second estimated when the screw 13 is completely screwed in. The orientation of the chain suspension body 17 is adjusted so that the orientation of the chain suspension portion 8 of the U-shaped member 2 substantially matches the tension direction of the suspension rope. Thereafter, the second U-shaped member 2 is pushed again toward the first U-shaped member 1 so that the hexagonal head 14 of the bolt 13 is clamped by the pair of left and right bolt head clamping portions 16 of the second U-shaped member 2, The bolt 13 is rotated in the screwing direction by the chain suspension body 17 and screwed so that the bottom plate portion 5 of the first U-shaped member 1 is completely sandwiched and fixed between the surface of the attachment target portion. It ’s fine.

  As shown in FIG. 5, the chain hanging tool of the present invention does not have the chain hanging portion 8 provided on the second U-shaped member 2 but is separately formed on the bottom plate portion 19 of the second U-shaped member 2. The lower means 20 can also be connected. In the illustrated example, the chain suspension means 20 includes a bolt 22 having a ring-shaped chain suspension 21 attached to the outer end thereof, and a cylinder in which the bolt 22 is removably screwed and fixed with a lock nut 23. A chain tension adjusting telescopic shaft portion 25 comprising a shaft member 24 is provided, and the cylindrical shaft member 24 of the chain tension adjusting telescopic shaft portion 25 includes a spherical head 26a of a bolt 26 and a cylindrical shape including the same. It is coupled to the second U-shaped member 2 through a spherical joint 28 comprising a holder 27. That is, the cylindrical shaft member 24 and the cylindrical holder 27 fitted to the cylindrical shaft member 24 are fixed by the rivets 29, and the bolts 26 are clamped and fixed inside the bottom plate portion 19 of the second U-shaped member 2 so as not to rotate. Are screwed together.

  In any of the above embodiments, as shown in FIG. 6, the thickness of the bottom plate portion 5 of the first U-shaped member 1 is used as the bolt 13 constituting the mounting screw shaft 4 protruding from the first U-shaped member 1. The large-diameter shaft portion 31 having a larger axial thickness than the thickness uses a stepped bolt provided between the screw shaft portion 13a and the head portion 14, and the large-diameter shaft portion 31 is mounted on the surface of the place to be attached. The first U-shaped member 1 can be configured to be able to rotate around the large-diameter shaft portion 31 of the bolt 13 even in the attached state in which the screw is completely screwed in. According to this configuration, the attached chain suspension body 17 can be freely rotated around the bolt 13 while being completely screwed and fixed to a state where the bolt 13 is not easily loosened. Can be used.

  In the above embodiment, the second U-shaped member 2 is loosely fitted inside the first U-shaped member 1 and both are connected by the support shaft 3, but the second U-shaped member 2 is connected to the outer side of the first U-shaped member 1. May be externally fitted and connected to each other by the support shaft 3. Further, although the support shaft penetrating long hole 10 is provided on the second U-shaped member 2, the support shaft penetrating long hole 10 may be provided on the first U-shaped member 1.

It is a partially longitudinal front view. It is a partially vertical side view. It is the XX sectional view taken on the line of FIG. It is a side view which shows the state at the time of attachment operation. It is a side view which shows another embodiment. It is a longitudinal cross-sectional view which shows the modification of the principal part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st U-shaped member 2 2nd U-shaped member 3 Support shaft 4 Installation screw shaft 5, 19 Bottom plate part 6, 9 Parallel both-side plate part 7 Through hole 8 Chain suspension part 10 Support shaft penetration long hole 11 Bolt (support shaft )
12 Nut for retaining 13 Bolt (screw for mounting)
14 Bolt hexagonal heads 14a, 14b Hexagonal head parallel two sides 15 Cavity 16 Bolt head clamping part 16a Projecting arc-shaped edge 17 Chain lifting device body 18 Screw hole 20 for installation target point Chain suspension means 25 Chain expansion / contraction shaft for tension adjustment 31 Large diameter shaft of bolt

Claims (3)

  When the first U-shaped member and the second U-shaped member are engaged with each other in the state where the parallel side plates of the other U-shaped member are fitted to each other between the parallel side plates of one U-shaped member. Is connected to the support shaft penetrating through the base plate, and a mounting screw shaft protrudes from the bottom plate portion of the first U-shaped member, and a chain suspension is formed at the bottom plate portion of the second U-shaped member. Alternatively, in the chain hanging tool in which a separately constructed chain hanging means is attached to the bottom plate portion of the second U-shaped member, the parallel both side plate portions of the second U-shaped member are parallel both side plate portions of the first U-shaped member. The screw shaft is configured by inserting a bolt having a rectangular head having parallel two sides into a through hole provided in the bottom plate portion of the first U-shaped member so as to be rotatable from the inside, The second U-shaped member has a shaft through hole provided in one of the U-shaped members as a long hole. By doing so, it is configured so that it can be freely inserted into and removed from the first U-shaped member, and the front ends of the parallel side plates of the second U-shaped member allow the second U-shaped member to enter the first U-shaped member. A chain suspension formed on a bolt head clamping portion that clamps parallel two sides of the square head of the bolt.   The chain hanging tool according to claim 1, wherein an end edge of the bolt head clamping portion at the tip of the parallel both side plate portions of the second U-shaped member is formed in a protruding arc shape. The bolt is provided with a large-diameter shaft portion between the screw shaft portion and the head portion having a larger diameter in the axial direction than the thickness of the bottom plate portion of the first U-shaped member. The chain hanging tool according to claim 1 or 2, wherein the chain hanging tool is configured to be rotatable around the large-diameter shaft portion of the bolt.

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