JP7223443B2 - Scaffold board fixing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scaffold board fixing device that can be used, for example, when assembling a temporary work scaffold under a bridge.

When assembling a temporary work scaffolding under a bridge, scaffolding boards of a certain width are placed on supporting steel pipes that are horizontally suspended at an almost constant height under the bridge and are arranged side by side at appropriate intervals. A temporary work scaffold is assembled by fixing to the supporting steel pipes. As a scaffold board fixing device that can be used when assembling such a temporary work scaffold, as described in Patent Document 1, a pair of hooks that can be hooked to supporting steel pipes on both sides of the scaffold board are attached to the scaffold board. It is known to connect with a belt on the upper side.

JP 2015-86593 A

In the conventional scaffolding board fixing device as described in the above-mentioned Patent Document 1, the belt fastening unit that holds the belt in a tensioned state is placed on the upper side of the scaffolding board. For workers who do this, there is a problem in terms of safety, because the protruding foreign matter may cause them to stumble. Moreover, the belt fastening unit placed on the upper side of the scaffolding board is connected by belts to two hook members that are adjacent to the left and right sides of the scaffolding board and engage with the supporting steel pipes, respectively. A book belt was used, and the number of parts increased.

The present invention proposes a scaffolding board fixing device that can solve the conventional problems as described above. For ease of reference, the reference numerals used in the description of this embodiment are shown in brackets: first hook (3) and second hook (4) for engaging the supporting steel pipe (1), belt A fastening unit (5) and one fastening belt (6) having one end connected to the upper end of the first hook (3) are provided, and the belt fastening unit (5) has one end connected to the second hook (4). A main body (16), which is pivotally connected to its upper end by a first horizontal support shaft (21) so as to be able to rise and fall, and extends to the side opposite to the side of the scaffolding board (2) with respect to the second hook (4). An operation piece (17) is pivotally connected to the other end of the main body (16) by a second horizontal shaft (24) so that it can be raised and lowered, and the operation piece (17) is laid over the main body (16). At times, the operating piece (17) and the main body (16) are provided with a detachable engaging means (18) for automatically engaging the operating piece (17), and the operating piece (17) has a fastening belt ( 6) is vertically inserted, and the first hook (3) and the second hook (4) are attached to both sides of the scaffolding board (2) supported on the supporting steel pipe (1). The fastening belt (6), which is engaged with the supporting steel pipe (1) adjacent to the side and extends from the first hook (3), traverses the scaffolding board (2) and then connects to the second hook ( 4) through the lower side of the first horizontal spindle (21), the lower side of the second horizontal spindle (24), and the opening (25) of the operating piece (17) in this order. ), and passed in the opposite direction between the fastening belt (6) located below the second horizontal support shaft (24) and the second horizontal support shaft (24). (17) is engaged with the main body (16) by the engaging means (18) in a state of being superimposed on the main body (16), and the entire belt fastening unit (5) is attached to the scaffolding board (2). It is configured to protrude outside of the side edge.

According to the configuration of the present invention, the belt fastening unit is integrated with the second hook on one side via the first horizontal spindle, and the main body of the belt fastening unit extends from the upper end of the second hook to the scaffolding. Since the belt fastening unit is in a state of extending to the opposite side of the board, there is no danger that the belt fastening unit will get on the upper side of the scaffold board, and workers can safely walk on the scaffold board. Moreover, compared with the conventional structure in which the belt is divided into two and connected to the first hook and the second hook, and these two belts are connected by the belt fastening unit, only one belt is connected to the first hook. Therefore, the number of parts is reduced and the handling becomes easier.

When carrying out the present invention, specifically, an opening (36) through which the fastening belt (6) is vertically inserted is provided at the end of the main body (16) on the side of the second horizontal support shaft (24). is provided, and the free end of the fastening belt (6) is inserted through the opening (25) on the side of the operation piece (17) in the opposite direction and guided to the outside of the operation piece (17). It can be constructed so that it can be pulled out to the lower side of the main body (16) through the opening (36) on the main body (16) side. According to this configuration, the extra length of the belt on the free end side, which is generated when the belt is used for a narrow scaffolding board, can be easily pulled out below the main body of the belt fastening unit, that is, in a direction out of the way. can be done. Therefore, the excessive length of the belt does not need to be pulled out from between the main body of the belt fastening unit and the operation piece toward the scaffold board, and the disposal of the excessive length of the belt is facilitated.

In addition, the upper end of the second hook (4) is formed in a U-shape in plan view with left and right side plate portions (14a, 14b) protruding outward from the substrate (12). The left and right side plates (19a, 19b) of the main body (16) are pivotally connected to (13) by a first horizontal support shaft (21), and the U-shaped upper end of the second hook (4) ( The bottom plate portion of 13) is provided with a notch recessed portion (4a) cut from the upper edge of the bottom plate portion, and the fastening belt (6) passes through this notch recessed portion (4a) to the first horizontal support shaft ( 21) can be configured to be inserted underneath. According to this configuration, the main body of the belt fastening unit can be easily and stably supported on the upper end of the second hook, and the belt can be easily and easily inserted below the first horizontal support shaft.

FIG. 1 is a side view showing a usage state of a scaffolding board fixing device according to an embodiment of the present invention. FIG. 2 is a longitudinal side view, omitting part of the belt, showing a state before use of the same scaffold board fixing device. FIG. 3 is a plan view showing a state before use of the same scaffold board fixing device, omitting a part of the belt. FIG. 4 is a partially longitudinal front view of the second hook and the belt fastening unit shown in FIG. 2; FIG. 5 is an exploded perspective view of the belt fastening unit. FIG. 6 is a partial longitudinal side view of the second hook and the belt fastening unit in use. FIG. 7 is a longitudinal side view showing just before the engagement release operation of the engagement means in the belt fastening unit. FIG. 8 is a vertical cross-sectional view showing immediately after the engagement release operation of the engagement means in the belt fastening unit.

As shown in FIG. 1, a scaffolding board fixing device according to the present invention is used to fix a scaffolding board 2 supported by a supporting steel pipe 1 to the supporting steel pipe 1. A first hook 3 and a second hook 4 to be engaged with the supporting steel pipe 1 in a state adjacent to both left and right sides, a belt fastening unit 5, and one fastening belt having one end connected to the upper end of the first hook 3 6.

2 to 5, the first hook 3 is provided with an elongated hole 9 through which the fastening belt 6 is inserted in the upper horizontal arm portion 8 of the hook-shaped substrate 7, and the upper horizontal arm portion 8. A spring member 10 is attached to the free end of the arm portion 8 to prevent the arm portion 8 from coming off from the supporting steel pipe. The spring material 10 is the same as that described in Patent Document 1 above. One end of the fastening belt 6 is passed through the long hole 9 and folded back, and the double-layered portion 6a is integrated by sewing. As shown in FIGS. 2 and 4, the second hook 4 has both side plate portions 14a and 14b bent to the same side from the left and right sides of the upper end portion of the hook-shaped substrate 12 extending upward. In the bottom plate portion (substrate 12) of the U-shaped upper end portion 13, a notch recess portion 4a is cut out in a rectangular shape from the upper edge thereof and through which the fastening belt 6 is passed. is provided. Moreover, when the second hook 4 is fitted to the supporting steel pipe 1 from the same side as the first hook 3, the both side plate portions 14a and 14b are oriented so as to protrude in the opposite direction to the side on which the scaffolding plate 2 is provided. formed. Of the side plate portions 14a and 14b at the U-shaped upper end portion 13 of the second hook 4, the side plate portion 14a on the side where the overhanging shoulder portion of the hook-shaped substrate 12 is located is parallel to the other side plate portion 14b. and extend along the overhanging shoulder in a gradually decreasing height. A reinforcing rib 15 is formed on the hook-shaped substrate 12 .

As shown in FIGS. 2 to 5, the belt fastening unit 5 has a U-shaped main body 16 whose cross section is open on the upper side and a U-shaped cross section whose width is narrower than that of the main body 16 and whose cross section is open on the lower side. operation piece 17 and engaging means 18. One end of each of the left and right side plate portions 19a and 19b of the main body 16 extends outward from the bottom plate portion 19c to form a bearing portion 20. In a state of being fitted between the plate portions 14a and 14b, the second hook is supported by a first horizontal support shaft 21 passing through the bearing portion 20 and both side plate portions 14a and 14b at the U-shaped upper end portion 13 of the second hook 4. 4 and the main body 16 are pivotally connected so as to be relatively swingable. The operating piece 17 is configured such that the tip bearing portions 23 of the left and right side plate portions 22a and 22b, which extend long at one end side, are fitted in positions near the free ends between the left and right side plate portions 19a and 19b of the main body 16, and the tip bearing portion 23 is engaged with the left and right plate portions 19a and 19b. The main body 16 and the operation piece 17 are pivotally supported and connected to each other by a second horizontal support shaft 24 penetrating through the portion 23 and the left and right side plate portions 19a and 19b of the main body 16. As shown in FIG. Therefore, when the scaffold board fixing device is not used, the operation piece 17 is swung around the second horizontal support shaft 24 to fit between the left and right side plate portions 19a and 19b of the main body 16, and the second hook 4 is swung around the first horizontal support shaft 21 so as to overlap the outer side of the bottom plate portion 19c of the main body 16, and the main body 16, the operation piece 17, and the second hook 4 can be superimposed on each other to reduce the bulk. .

The operation piece 17 has a top plate portion that connects and integrates the left and right side plate portions 22a and 22b. The top plate portion 22c on the side where the second horizontal support shaft 24 is located from the opening portion 25 has the side edge on the opening portion 25 side folded inward to form the belt guide portion 26, and the operation piece 17 extends from the opening portion 25. The top plate portion 22d on the free end side of the top plate portion 22d has a side edge on the side of the opening portion 25 that is curved inward to form a spring receiving portion 27, and is notched in an arc shape from the free end of the top plate portion 22d. An operating opening 28 is provided. The engaging means 18 is provided inside the free end side top plate portion 22 d having the spring receiving portion 27 and the operation opening 28 , and is fitted into the main body 16 . The operation piece 17 laid down around the shaft 24 and the main body 16 are automatically engaged.

The engaging means 18 is composed of an engaging body 29 , a biasing spring 30 , and engaging portions 31 formed on the upper sides of the left and right side plate portions 19 a and 19 b of the main body 16 . The engaging body 29 is composed of a lower plate portion 29a and an upper plate portion 29b, and a U-turn plate portion 29c that connects and integrates the lower plate portion 29a and the upper plate portion 29b on the free end side of the operation piece 17. Long holes 32a and 32b provided in the left and right side plate portions 22a and 22b of the operation piece 17 along the length direction of the operation piece 17 can be seen from the left and right sides of the lower side plate portion 29a. A pair of left and right engaging plate portions 33a and 33b are provided so as to protrude to the outside of the left and right side plate portions 22a and 22b through a predetermined length. Therefore, the engaging body 29 is supported so as to be reciprocally movable within a certain range in the longitudinal direction of the operation piece 17 by engaging the pair of right and left engaging plate portions 33a, 33b and the elongated holes 32a, 32b. .

The urging spring 30 is formed by bending a single spring steel wire rod, and includes linear wire rod portions 30a and 30b parallel to each other at both ends, and the linear wire rod portions 30a and 30b extending parallel to each other. It is composed of an S-shaped wire portion 30c that connects and integrates ends located on opposite sides. One linear wire portion 30a of the biasing spring 30 is fitted into the spring receiving portion 27 of the top plate portion 22d of the operating piece 17, and the other linear wire portion 30b is engaged with the U-turn of the engaging body 29. By fitting into the plate portion 29c, the elastic restoring force of the S-shaped wire portion 30c acting in the direction of separating the straight wire portions 30a and 30b from each other pushes the engaging body 29 toward the free end side of the operating piece 17. It is pressed and energized. Therefore, as shown in FIG. 4, the engaging body 29 is held at the retraction limit position where the pair of left and right engaging plate portions 33a and 33b abut against the outer ends of the long holes 32a and 32b on the operation piece 17 side.

As shown in FIGS. 2 and 6, the engaging portion 31 on the main body 16 side is used for biasing when the operation piece 17 is rotated around the second horizontal support shaft 24 and fitted into the main body 16. The engaging body 29 held at the retraction limit position by the spring 30 is pushed through the pair of left and right engaging plate portions 33a and 33b against the biasing force of the biasing spring 30 to move the second horizontal support shaft 24. The lower side of the cam plate portion 31a receives the cam plate portion 31a that moves forward to the one side and the engaging plate portions 33a and 33b that are disengaged from the cam plate portion 31a so as to reciprocate in the longitudinal direction of the main body 16. It is composed of a horizontal guide surface 31b that guides to the Therefore, when the operating piece 17 is rotated around the second horizontal support shaft 24 and fitted into the main body 16, the cam plate portion 31a of the engaging portion 31 moves the engaging body 29 (engaging plate portions 33a and 33b). , once moves forward from the retraction limit position against the biasing force of the biasing spring 30, and then the engaging body 29 (engagement plate portions 33a, 33b) is again moved to the retraction limit position by the biasing force of the biasing spring 30. By moving backward, the pair of left and right engaging plate portions 33a and 33b of the engaging body 29 enter the lower side of the cam plate portion 31a of the engaging portion 31, and the engaging body 29 moves upward away from the engaging portion 31. Since movement is prevented, the operating piece 17 is automatically held in the retracted position fitted in the main body 16 .

As described above, the operating piece 17, which is automatically held in the housing position fitted in the main body 16 by the action of the engaging member 29, the engaging portion 31, and the biasing spring 30, is moved to the second horizontal support shaft 24. , the engaging member 29 at the retraction limit position is moved forward against the biasing force of the biasing spring 30, and the pair of left and right engaging plates of the engaging member 29 is moved forward. The portions 33a and 33b can be removed forward from the cam plate portion 31a of the engaging portion 31, but the free end side top plate of the operation piece 17 is designed so that this operation can be easily performed using a rod-shaped tool such as a chisel. In addition to the operation opening 28 formed in the portion 22d, the engaging member 29 is provided with an operation hole 34. As shown in FIG. The operation hole 34 is provided at the central position of the engaging body 29 in the lateral width direction. The entire lower side of the operation hole 34, which extends over the upper half of the portion 29c, is closed by the upper surface of the lower plate portion 29a extending to the outer peripheral surface of the U-turn plate portion 29c. Therefore, as shown in FIGS. 7 and 8, a tapered tip end portion 35a of a rod-shaped tool 35 such as a chisel is passed through an operation opening portion 28 formed in the top plate portion 22d on the free end side of the operation piece 17. By inserting the rod-shaped tool 35 into the operation hole 34 of the lower engaging body 29 and pushing it forward in this state, the engaging body 29 is moved forward against the biasing force of the biasing spring 30. The engaging plate portions 33a and 33b of the engaging body 29 are separated forward from the lower side of the cam plate portion 31a of the engaging portion 31, and the operation piece 17 can be opened upward from the main body 16. As shown in FIG.

As shown in FIG. 1, a scaffolding board 2 is placed on supporting steel pipes 1 horizontally suspended at predetermined intervals in the lengthwise direction of the scaffolding board. The scaffolding board 2 having a required width is constructed by placing a plurality of single scaffolding boards 2a in parallel in the longitudinal direction of the supporting steel pipe 1. As shown in FIG. In order to fix the scaffolding board 2 to the supporting steel pipe 1, the scaffolding board fixing device having the above configuration is used. to engage with the supporting steel pipe 1. Since the first hook 3 is attached with a spring member 10 for preventing detachment, the first hook 3 can be supported without manually holding the first hook 3 engaged with the supporting steel pipe 1. It does not come off unexpectedly from the steel pipe 1 for use.

Next, the fastening belt 6 is pulled in the transverse direction above the scaffolding board 2, and as shown in FIG. The first horizontal support shaft 21 connecting the second hook 4 and the main body 16 is inserted from the lower side to the upper side of the bottom plate portion 19c of the main body 16, and the fastening belt 6 is connected to the main body 16 and the operation piece. 17 from the outside of the belt guide portion 26 of the operation piece 17 through the space between the second horizontal support shaft 24 and the bottom plate portion 19c. The belt 6 is passed through between the second horizontal support shaft 24 and the fastening belt 6 located outside thereof and pulled out to the rear side of the operation piece 17 .

After the belt fastening unit 5 is attached to the fastening belt 6 as described above, the second hook 4 connected to the belt fastening unit 5 via the first horizontal support shaft 21 is attached to both the left and right sides of the scaffolding board 2 . Adjacent to the other side, it is engaged with the supporting steel pipe 1 from the same side as the first hook 3 . In this state, the free end of the fastening belt 6 pulled out behind the operation piece 17 of the belt fastening unit 5 is pulled to tighten the fastening belt 6 on the scaffold board 2. In order to reduce the tensile resistance of 6, the operation piece 17, which is shown standing up from the main body 16 as shown in FIG. , the tensile resistance of the fastening belt 6 is extended along the folded side of the belt guide portion 26 of the operating piece 17 on the belt insertion opening 25 side. It becomes only resistance when making a U-turn and can be easily pulled.

When the fastening belt 6 on the scaffolding board 2 is tightened by the above work and the first hook 3 and the second hook 4 are in close contact with the left and right sides of the scaffolding board 2, the tensioned state of the fastening belt 6 is While maintaining the position, the operation piece 17 is rotated around the second horizontal support shaft 24 and erected, and the fastening belt 6 pulled out on the back side of the operation piece 17 is pulled out from the belt insertion opening 25 of the operation piece 17. The operation piece 17 is pulled out to the outside, and the operation piece 17 is turned and housed in the main body 16 around the second horizontal support shaft 24 . As a result, as shown in FIG. 6, the operating piece 17 is automatically engaged with the main body 16 by the action of the engaging means 18 and is held in the state of being turned and housed within the main body 16 . If the belt insertion opening 36 is provided at the free end of the bottom plate portion 19c of the main body 16 so as to be visible outside the second horizontal support shaft 24 in a plan view, the belt insertion opening 36 can be pulled out to the upper side of the operation piece 17. The free end side of the fastening belt 6 can be pulled out to the lower side of the main body 16 from the belt insertion opening 36 via the outside of the second horizontal support shaft 24 . As shown in FIG. 1, the belt fastening unit 5 of the scaffolding board fixing device used in this way is rotated slightly downward around the first horizontal support shaft 21 by the gravity acting on the belt fastening unit 5, and the main body 16 The free end is supported on the supporting steel pipe 1 . The tension state of the fastening belt 6 along the top of the scaffolding board 2 between the first hook 3 and the second hook 4 as described above is the folded state shown in FIG. As it is folded back, it is securely held by a large resistance force caused by a U-turn in a folded state in which the directions of loosening are opposite to each other around the second horizontal support shaft 24, and the fastening belt 6 is naturally loosened. It won't go away.

When the scaffolding board 2 is to be dismantled and removed, the engaging body 29 of the engaging means 18 is moved in the forward direction against the biasing force of the biasing spring 30 from the retraction limit position by the method described above. The engaging plate portions 33a and 33b of the engaging body 29 are removed from the engaging portion 31 on the 16 side, and the operation piece 17 is opened from the main body 16 around the second horizontal support shaft 24 so that the operation piece 17 extends in the extension direction of the main body 16. Since the tightened fastening belt 6 is loosened by changing the posture to extend to the side, the fastening belt 6 is pulled from the second hook 4 to the side where the first hook 3 is located, and the fastening action to the scaffolding board 2 can be released.

INDUSTRIAL APPLICABILITY The scaffolding board fixing device of the present invention can be utilized as means for fixing scaffolding boards to supporting steel pipes, for example, when assembling temporary work scaffolding under a bridge.

REFERENCE SIGNS LIST 1 Supporting steel pipe 2 Scaffolding plate 3 First hook 4 Second hook 4a Notch recess 5 Belt fastening unit 6 Fastening belt 6a Double layered portion 7, 12 Hook-shaped substrate 8 Top horizontal arm 9 Long hole 10 Spring Material 11, 15 Reinforcement rib 13 U-shaped upper end of second hook 14a, 14b Side plate 16 Main body (belt fastening unit)
17 operation piece (belt fastening unit)
18 engagement means (belt fastening unit)
19a, 19b Left and right side plate portions of main body 19c Bottom plate portion of main body 20 Bearing portion 21 First horizontal spindle 22a, 22b Left and right side plate portions of operation piece 22c, 22d Top plate portion of operation piece 23 Tip bearing portion 24 Second horizontal Support shafts 25, 36 Belt insertion opening 26 Belt guide 27 Spring receiver 28 Operation opening 29 Engaging body 29a Lower plate 29b Upper plate 29c U-turn plate 30 Biasing springs 30a, 30b Linear wire Part 30c S-shaped wire part 31 Engagement part 31a Cam plate part 31b Horizontal guide surface 32a, 32b Slotted holes 33a, 33b Engagement plate part 34 Operation hole 35 Rod-shaped tool such as chisel 35a Tapered tip

Claims (3)

Equipped with a first hook and a second hook to be engaged with the supporting steel pipe, a belt fastening unit, and one fastening belt having one end connected to the upper end of the first hook, the belt fastening unit is attached to the upper end of the second hook A main body, one end of which is rotatably supported by the first horizontal shaft and extends to the opposite side of the second hook to the side where the scaffolding board is located, and the other end of the main body is connected by the second horizontal shaft. The operating piece is provided with an operating piece that is pivotally connected so as to be able to rise and fall, and a detachable engaging means that automatically engages the operating piece and the main body when the operating piece is laid down so as to overlap the main body. is provided with an opening through which the fastening belt is vertically inserted in the middle position between both ends, and the first hook and the second hook are positioned adjacent to both sides of the scaffolding board supported on the supporting steel pipe. The fastening belt engaged with the supporting steel pipe and extending from the first hook is traversed on the scaffolding board, then under the first horizontal support shaft of the second hook, under the second horizontal support shaft, and through the opening of the operation piece in this order and guided to the back side of the operation piece, and in the opposite direction between the fastening belt located below the second horizontal support shaft and the second horizontal support shaft The operation piece is engaged with the main body by the engaging means in a state of being superimposed on the main body, and the entire belt fastening unit is configured to protrude outside one side of the scaffold board, Scaffold board fixing device. An opening is provided at the end of the main body on the side of the second horizontal support shaft to allow the fastening belt to pass through in the vertical direction, and the free end of the fastening belt is inserted through the opening on the operation piece side in the opposite direction. 2. The scaffolding board fixing device according to claim 1, wherein the operating piece is guided to the outside of the operating piece by a hand and then pulled out to the lower side of the main body through the opening on the main body side. The upper end portion of the second hook is formed in a U-shape in plan view with left and right side plate portions protruding outward from the base plate, and the left and right side plate portions of the main body are attached to the upper end portion of the U-shape for the first horizontal support. The bottom plate portion at the U-shaped upper end portion of the second hook is provided with a recess formed by notching from the upper edge thereof, and the fastening belt is passed through this recessed portion. 3. The scaffolding board fixing device according to claim 1 or 2, wherein is inserted under the first horizontal support shaft.

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