Mounting and fixing device for accessories in work scaffolding equipment

Abstract

To provide a device that attaches and fixes accessories, such as an extension top plate, a handrail frame and a gangway, to a top plate of a scaffold device for work.SOLUTION: An attaching / fixing device is configured to attach and fix an accessory (4) to a top plate edge part (5), wherein the top plate edge part (5) has a vertical wall forming an edge face and upper and lower walls, extending substantially horizontally from an upper end and a lower end of the vertical wall, formed in one body, and also has a groove part (9) recessed in the upper wall to extend in parallel with the edge surface, the accessory (4) has an insertion piece (16) inserted slidably into the groove part (9) and extending from a fixation body (15) facing the top plate edge part (5), and attachment / detachment fixation means (17) is provided which mutually fixes the fixation body (15) and top plate edge part (5) detachably so that the insertion piece (16) cannot escape from the groove part (9) and cannot slide into the groove part (9) in a state in which the accessory (4) is moved to a predetermined attachment position (P) of the top plate edge part by inserting and sliding the insertion piece (16) into the groove part (9).SELECTED DRAWING: Figure 2

Description

Technical Field

[0006] , ,

[0005] , , ,

[0001] The present invention relates to a device for attaching and fixing an extended top plate, a handrail frame, a tarp, or other attachments to a top plate of a workbench or other work staging device at a predetermined attachment position in a folding workbench or other work staging device.

Background Art

[0002] For example, in a portable workbench, it is known that the work floor can be expanded by connecting the top plates of both workbenches with an extended top plate while the pair of workbenches are arranged at a distance from each other (Patent Document 1).

[0003] In addition, in an elevated workbench, it is also known to provide a handrail frame for ensuring the safety of an operator around the work floor formed by the top plate, or to provide a tarp for the operator to move up and down from the floor surface where the workbench is installed to the top plate (Patent Document 2).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0005] When attaching and fixing an extended top plate, a handrail frame, a tarp, or other attachments to a work staging device such as a workbench, for example, a metal fitting provided with bolts and nuts or a C-clamp fitting can be used, but the work is complicated. In particular, in the case of a folding workbench, it is necessary to repeatedly remove and attach the attachments each time the work for folding and unfolding is performed, so it is desirable to have a configuration that can be easily attached and detached.

[0006] Furthermore, while the accessories are designed to be attached and fixed to predetermined mounting positions on work platforms and other work scaffolding equipment, it is not always easy for workers to visually confirm the predetermined mounting positions on-site, and there is a risk of mistakenly attaching them to a position other than the predetermined mounting position (hereinafter referred to as "installation error"), which presents a problem as it requires reattachment later.

[0007] In view of the above, the present invention aims to provide a device that allows for the easy and precise attachment and fixing of accessories such as extension top plates, handrail frames, and ladders to work platforms and other work scaffolding devices, with respect to their predetermined attachment positions. [Means for solving the problem]

[0008] Therefore, in order to solve the above problems, the present invention provides a means for attaching and fixing an accessory to a work platform device equipped with a top plate that forms a work floor on which a worker stands, wherein the top plate edge portion that forms the edge of the top plate is integrally formed with a vertical wall that forms the edge surface and an upper wall and a lower wall that extend substantially horizontally from the upper and lower ends of the vertical wall, and a groove portion that extends parallel to the edge surface is recessed in the upper wall, thereby providing a groove bottom wall and a groove side wall inside the groove portion, wherein the accessory portion comprises a fixing body facing the top plate edge portion, and an insertion piece that extends from the outside of the top plate edge portion to the fixing body is slidably inserted into the groove portion, and a detachable fixing means is provided to detachably fix the insertion piece to the fixing body and the top plate edge portion such that it cannot escape from the groove portion and cannot slide, once the insertion piece of the fixing body has been moved to a predetermined mounting position on the top plate edge portion by inserting it into the groove portion and sliding it, wherein

[0009] In the first embodiment of the present invention, the accessory constitutes a substantially rectangular extension top plate that connects the top plates of a pair of work scaffolding devices when the two scaffolding devices are spaced apart. The extension top plate is configured as a fixing body by end covers that cover and fix both ends in the longitudinal direction in the short direction, and as an insertion piece by a hook piece with a downward-facing claw portion protruding from the end cover. The attachment and detachment fixing means consists of a locking hole provided in the vertical wall of the top plate edge corresponding to a predetermined mounting position of the extension top plate, and a locking means provided to be able to move back and forth in the direction of projection from the end cover. The extension top plate is moved to a predetermined mounting position by positioning the end cover of the extension top plate facing the vertical wall of the top plate edge and inserting the downward-facing claw portion of the hook piece into the groove and sliding it, and the locking means is advanced in the projection direction and inserted into the locking hole, thereby locking and fixing the hook piece so that it cannot escape from the groove and cannot slide.

[0010] In the first embodiment, the locking means comprises a horizontal rod that is movable forward and backward in a housing fixed to the underside of the extension top plate inside the end cover, a locking claw at the tip of the horizontal rod, and a spring that biases the horizontal rod in the forward direction so that the locking claw protrudes from the insertion hole of the end cover. A guide tapered surface is provided on the lower surface of the locking claw. When the downward claw portion of the hook piece is inserted from above toward the groove, the guide tapered surface of the locking claw contacts the vertical wall of the top plate edge, causing the horizontal rod to move backward against the spring. When the extension top plate is moved to a predetermined mounting position, the horizontal rod moves forward due to the spring, inserting and locking the locking claw into the locking hole.

[0011] In a second embodiment of the present invention, the attachment constitutes a handrail frame with a support column erected from the vertical wall of the edge of the top plate, and the fixing body is provided on the support column, the fixing body comprises an upper jaw member and a lower jaw member that hold the edge of the top plate from above and below, the upper jaw member is provided with a vertical rod that is movable up and down toward the lower jaw member and is biased downward via a spring, the insertion piece is formed by the vicinity of the lower end of the vertical rod, and the attachment and detachment fixing means is located at the bottom wall of the groove of the edge of the top plate corresponding to a predetermined mounting position of the handrail frame The device is constructed by inserting and locking the insertion piece of the vertical rod into a locking hole provided therein. The top plate edge is held in the holding space between the upper and lower jaw members, which is opened by moving the vertical rod upward against the spring. The insertion piece is elastically brought into contact with the bottom wall of the groove by moving the vertical rod downward with the biasing force of the spring, and the insertion piece slides along the bottom wall of the groove, moving the handrail frame to a predetermined mounting position, thereby inserting and locking the downward-biased insertion piece of the vertical rod into the locking hole.

[0012] In the second embodiment, the top plate edge is located below the locking hole provided in the groove bottom wall of the groove, and a lower locking hole is provided in the lower wall. The lower jaw member of the fixing body has a fixing hole into which an insertion piece at the lower end is inserted when the vertical rod is moved downward. With the top plate edge held in the holding space between the upper and lower jaw members and the handrail frame moved to a predetermined mounting position, the insertion piece of the vertical rod, which is moved downward by the biasing force of the spring, is inserted through the locking hole and the lower locking hole of the top plate edge, and further, the lower end of the insertion piece is inserted into the fixing hole.

[0013] In a third embodiment of the present invention, the accessory constitutes a ladder for a worker to ascend and descend to the top plate from the floor surface on which the work scaffolding device is installed, and an auxiliary top plate is provided at the top of the ladder, which is joined to the top plate of the work scaffolding board substantially flush with it, the auxiliary top plate constitutes the fixing body by providing a cover member on its end face, and the insertion piece constitutes the hook piece having a downward-facing claw portion protruding from the cover member, the attachment and detachment fixing means consists of a clamp provided on the cover member via a bracket material, and the lower wall of the top plate edge that is fastened from below by the clamp at a predetermined mounting position P, the bracket material is such that when the downward-facing claw portion of the hook piece is inserted into the groove of the top plate edge, the lower of the top plate edge The lower surface of the wall is provided with a horizontal bracket spaced apart, and the clamping device is composed of a bolt that is screwed into a nut fixed to the horizontal bracket and rotated to move vertically, an operating part that rotates the bolt on the lower side of the horizontal bracket, and a pressing part provided on the upper end of the bolt on the upper side of the horizontal bracket. The cover member of the auxiliary top plate is positioned facing the vertical wall of the top plate edge, and the ladder is moved to a predetermined mounting position by inserting the downward claw portion of the hook piece into the groove and sliding it, and the bolt of the clamping device is moved upward via the operating part, pressing the pressing part against the lower wall of the top plate edge, thereby locking and fixing the hook piece in a way that prevents it from escaping and sliding out of the groove. [Effects of the Invention]

[0014] According to the present invention, the device for attaching and fixing the accessory 4 to a predetermined mounting position P on the top plate 2 comprises means in the top plate edge 5 where a groove 9 is formed on the top plate 2, and means in the accessory 4 which is detachably fixed to the groove 9. Therefore, the attachment 4 can be easily moved to the predetermined mounting position P on the top plate edge 5 by inserting the insertion piece 16 of the fixing body 15 into any position in the groove 9 and then sliding the fixing body 15 using the groove 9 as a guide.

[0015] Furthermore, since a detachable fixing means 17 is provided between the fixing body 15 and the edge portion 5 of the top plate, which allows the insertion piece 16 to be detachably fixed in a way that prevents it from escaping or sliding out of the groove portion 9 when the fixing body 15 is moved to a predetermined mounting position P, there is no risk of installation errors, and it has the effect of being able to be installed and fixed easily. [Brief explanation of the drawing]

[0016] [Figure 1] This image shows a folding work platform as an example of a work scaffolding device according to the present invention, where (A) is a perspective view of the work platform, (B) is an enlarged cross-sectional view along line AA, and (C) is an enlarged cross-sectional view along line BB. [Figure 2] This is a perspective view showing a pair of foldable workbenches, spaced apart from each other, with their extension top plate, handrail frame, and ladder attached and fixed to their designated mounting positions. [Figure 3] This is a perspective view showing the upper surface of the extension top plate according to the first embodiment of the present invention. [Figure 4] This is a perspective view showing the underside of the extension tabletop. [Figure 5] This perspective view shows the underside of the end of the extension top plate, with the end cover and detachable fixing unit separated from the end. [Figure 6] Regarding the detachable fixing unit, (A) is a perspective view showing the top surface of the detachable fixing unit, and (B) is a perspective view showing the detachable fixing unit in a disassembled state. [Figure 7] Regarding the detachable fixing unit, (A) is a perspective view showing the bottom surface of the detachable fixing unit, and (B) is a perspective view showing the detachable fixing unit in a disassembled state. [Figure 8] Regarding the operation of the first embodiment, (A) is a perspective view showing the state in which the downward claw portion of the extension top plate is inserted into the groove at the edge of the top plate of the workbench, (B) is a cross-sectional view showing the state of the locking claw when the downward claw portion is inserted into the groove, and (C) is a cross-sectional view showing the state of the locking claw after the downward claw portion has been inserted into the groove. [Figure 9]Regarding the operation of the first embodiment, (A) is a perspective view showing a state where the extended top plate is positioned at a predetermined mounting position by sliding the downward claw portion along the groove portion, (B) is a cross-sectional view showing a state where the locking claw is inserted and locked into the locked hole, and (C) is a cross-sectional view showing the operation when removing the extended top plate from the workbench. [Figure 10] Regarding the second embodiment of the present invention, it is a perspective view showing a handrail frame. [Figure 11] It is a side view showing a fixing body provided on a support column of the handrail frame, and upper and lower jaw members and a vertical rod constituting the detachable fixing means. [Figure 12] Regarding the upper and lower jaw members and the vertical rod, a state where the vertical rod is moved upward is shown, (A) is a perspective view, (B) is a cross-sectional view, and (C) is a C-C cross-sectional view. [Figure 13] Regarding the upper and lower jaw members and the vertical rod, a state where the vertical rod is moved downward is shown, (A) is a perspective view, (B) is a cross-sectional view, and (C) is a D-D cross-sectional view. [Figure 14] Regarding the operation of the second embodiment, (A) is a perspective view showing a state where the upper and lower jaw members face the edge of the top plate of the workbench, (B) is a perspective view showing a state where the edge of the top plate is held in the holding space between the upper and lower jaw members and the vertical rod is inserted into the groove portion, and (C) is a perspective view showing a state where the handrail frame is positioned at a predetermined mounting position on the workbench by sliding along the groove portion. [Figure 15] Regarding the third embodiment of the present invention, a tarap is shown, (A) is a perspective view of the tarap, and (B) is a perspective view showing an enlarged auxiliary top plate. [Figure 16] The operation of the third embodiment is shown in a cross-sectional view. (A) is a cross-sectional view showing a state where the downward claw portion is inserted into the groove portion at the edge of the top plate on the workbench, and (B) is a cross-sectional view showing a state where the pressing portion of the clamp is pressed against the lower wall of the edge of the top plate. [Figure 17] The operation of the third embodiment is shown in a perspective view. (A) is a perspective view showing a state where the cover member of the auxiliary top plate faces the edge of the top plate of the workbench, (B1) is a perspective view showing a state where the downward claw portion is inserted into the groove portion at the edge of the top plate and fixed at a predetermined mounting position from above, and (B2) is a perspective view showing the state of (B1) from below. [Modes for carrying out the invention]

[0017] Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

[0018] Figures 1 and 2 show a folding workbench 1 as an example of a work scaffolding device. The workbench 1 has a top plate 2 composed of left and right divided top plates 2a, 2a, which are pivotally connected so that the position can be changed between a folded position where the divided top plates 2a, 2a are folded into a mountain shape and an unfolded position where they are horizontal. The divided top plates 2a, 2a are each supported by leg frames 3, 3 with casters. Therefore, as shown in the figures, the workbench 1 is provided for working at heights in the unfolded position by unfolding the divided top plates 2a, 2a horizontally and supporting them with the leg frames 3, 3 which are spaced apart from each other. On the other hand, although not shown in the figures, when not in use, the divided top plates 2a, 2a can be folded in half, the left and right leg frames 3, 3 can be placed close together and the top plates 2a, 2a can be placed outside them in a folded position, parallel to each other in a nearly vertical position.

[0019] However, it should be understood that the present invention is not intended for a folding workbench structure, and is not limited to workbenches as shown in the figures, but can be widely applied to work scaffolding devices equipped with a top plate for forming a work platform on which workers stand and perform tasks.

[0020] Incidentally, work platforms and other work scaffolding devices are used with various attachments 4 attached and fixed. For example, in the case of the work platform 1 shown in the figure, as shown in Figure 2, the attachments 4 constitute a roughly rectangular extension top plate 4A, and when a pair of work platforms 1, 1 are placed spaced apart, the top plates 2, 2 of both work platforms are connected to each other with multiple extension top plates 4A to provide a large work area. In addition, a handrail frame 4B is also made up of attachments 4, and by surrounding the work area, the safety of the worker is ensured. Furthermore, the attachments 4 constitute a ladder 4C, which is used to allow the worker to ascend and descend from the floor surface on which the work platform 1 is installed to the top plate 2.

[0021] These accessories 4 are intended to be used after being precisely mounted and fixed to a predetermined mounting position on the workbench 1. Therefore, it is desirable that the mounting and fixing device be configured so that the accessories 4 are not mistakenly mounted to a position other than the predetermined mounting position during the mounting work, in other words, so that mounting errors do not occur.

[0022] Furthermore, in the case of a folding workbench, it is necessary to repeatedly attach and detach the attachment 4, so it is desirable to configure it so that the attachment and detachment of the attachment 4 can be done easily and simply.

[0023] (The edge of the tabletop) From the above viewpoint, it is preferable that the attachment 4 be configured to be attached and fixed to the edge of the tabletop 2 of the workbench 1. This allows the attachment 3 to be viewed from the outside of the workbench 1, and can be easily attached while visually checking the edge of the tabletop 2. For this reason, as shown in Figure 1, the present invention provides a gable edge frame 5a on the gable edge and a girder edge frame 5b on the girder edge of the tabletop 2. Both frames 5a and 5b are made of long extruded metal such as aluminum, and it is preferable that they have high rigidity by being hollow molded as shown in Figures 1(B) and (C), and are integrally bonded around the tabletop 2. Hereinafter, the gable edge frame 5a and the girder edge frame 5b will be collectively referred to as the tabletop edge 5, but in the present invention, the tabletop edge 5 may be formed from a separate frame material or integrally formed with the tabletop 2.

[0024] As shown in Figures 1(B) and 1(C), the top plate edge 5 is integrally formed with a vertical wall 6 that forms the edge surface, and an upper wall 7 and a lower wall 8 that extend substantially horizontally from the upper and lower ends of the vertical wall 6. A groove 9 is recessed in the upper wall 7, extending parallel to the edge surface, so that the groove 9 has a groove bottom wall 10 and groove side walls 11, 11 inside.

[0025] In the illustrated embodiment, the girder edge frame 5b is fixed to the girder side edge of the top plate 2 by rivets or the like, with a pair of upper and lower clamping pieces 12 and 13 clamping it. In contrast, the end edge frame 5a is attached along the end side edge of the top plate 2 and fixed by appropriate means. As shown in Figure 1(D), the ends of the end edge frame 5a and the girder edge frame 5b, which are abutted in an intersecting direction at the corner of the top plate 2, are connected by being fixed to the corner fitting 14. In this case, it is preferable that the corner fitting 14 is configured to form a cross-shaped groove, thereby opening outward without closing the grooves 9 of the end edge frame 5a and the girder edge frame 5b.

[0026] (Mounting and securing device for accessories) The device for attaching and fixing the accessory 4 to a predetermined mounting position on the top plate 2 consists of means in the top plate edge 5 including the groove 9, and means in the accessory 4 which is detachably fixed to the groove 9.

[0027] In all of the extension top plate 4A, handrail frame 4B, and ladder 4C described later as the first to third embodiments, the accessory 4 is provided with a fixing body 15 facing the edge portion 5 of the top plate, and an insertion piece 16 is extended from the fixing body 15 so as to be slidably inserted into the groove portion 9 from the outside of the edge portion 5 of the top plate.

[0028] Therefore, the attachment 4 can be easily moved to a predetermined mounting position P on the top plate edge 5 by inserting the insertion piece 16 of the fixing body 15 into any position in the groove 9 and then sliding it using the groove 9 as a guide.

[0029] Furthermore, a detachable fixing means 17 is provided to detachably fix the insertion piece 16 in the groove 9 so that it cannot escape or slide once it has moved to the predetermined mounting position P. The detachable fixing means 17 is provided on both the fixing body 15 and the edge of the top plate 5, and is preferably configured to operate only when the fixing body 15 of the accessory 4 is facing the predetermined mounting position P, thereby preventing installation errors. Moreover, it is preferable that the detachable fixing means 17 is configured to operate automatically when the fixing body 15 is facing the predetermined mounting position P, thereby making the work extremely easy.

[0030] (First Embodiment) Figures 3 to 9 show a first embodiment of the present invention, in which the accessory 4 is composed of an extension top plate 4A.

[0031] The nearly rectangular extension top plate 4A is configured as the fixing body 15 by end covers that cover and fix both ends in the longitudinal direction in the short direction, and the insertion piece 16 is configured as the hook piece 22 with downward-facing claw portions 22a that protrude from the end cover 15.

[0032] The attachment and detachment fixing means 17 consists of a locking hole 23 provided in the vertical wall 6 of the edge portion 5 of the extension top plate 4A corresponding to a predetermined mounting position P of the extension top plate 4A, and a locking means 24 provided so as to be able to move back and forth in the direction of protrusion from the end cover 21 (see Figure 9).

[0033] The locking means 24 comprises a detachable fixing unit 25U which includes a lateral rod 26 that is movable forward and backward in a housing 25 fixed to the underside of the extension top plate 4A inside the end cover 21, a locking claw 27 at the tip of the lateral rod 26, and a spring 28 that biases the lateral rod 26 in the forward direction so that the locking claw 27 protrudes from the insertion hole 21a of the end cover 21 (see Figures 5 to 7). In this case, the locking claw 27 has a guide tapered surface 27a that slopes downward from its tip.

[0034] In the illustrated embodiment, a pair of parallel horizontal rods 26, 26 are connected by a bar member 29 and housed together with a spring 28 in the guide passage 25a of the housing 25. Locking claws 27, 27 protrude from the guide passage 25a through a pair of insertion holes 21a, 21a. An opening 25b is provided on the lower side of the housing 25 so that the bar member 29 can be operated by hand from below the extension top plate 4A.

[0035] In the first embodiment, in order to attach and fix the extension top plate 4A, first, as shown in Figure 8, the end cover 21 is positioned at any location away from the locking hole 23 that defines the predetermined mounting position P, facing the vertical wall 6 of the top plate edge 5, and the downward claw portion 22a of the hook piece 33 is inserted from above toward the groove 9. At this time, the guide tapered surface 22a of the locking claw 22 comes into contact with the vertical wall 6 of the top plate edge 5, causing the lateral rod 26 to move backward against the spring 28, so that the downward claw portion 22a is inserted into the groove 9 and the hook piece 22 is placed on the upper wall 7 of the top plate edge 5.

[0036] In this state, the extension top plate 4A is slidable along the groove 9 with its downward-facing claw portion 22a inserted into the groove portion 9 and its locking claw 27 elastically in contact with the vertical wall 6.

[0037] As shown in Figures 9(A) and 9(B), when the extension top plate 4A is moved along the groove 9 toward the predetermined mounting position P, as soon as the locking claw 27 faces the locking hole 23, the lateral rod 26 is advanced by the spring 28, and the locking claw 27 is automatically inserted and locked into the locking hole 23.

[0038] As a result, the hook piece 22 is locked and fixed in the groove 9 in a way that prevents it from escaping or sliding, and the extension top plate 4A is attached and fixed to the top plate edge 5 at a predetermined mounting position P.

[0039] By the way, in order to remove the extension top plate 4A, as shown in Figure 9(C), by manipulating the bar member 29 with your fingers from the underside of the housing 25, the lateral rod 26 will be moved backward against the spring 28, causing the locking claw 27 to disengage from the locking hole 23. In this state, the extension top plate 4A can be lifted, and the downward claw portion 22a of the hook piece 22 can be released upward from the groove 9.

[0040] (Second Embodiment) Figures 10 to 14 show a second embodiment of the present invention, in which the accessory 4 is composed of a handrail frame 4B, and is attached and fixed at a predetermined mounting position P, and includes support columns 31 erected from the vertical wall 6 of the top plate edge 5, with the fixing body 15 provided on each of the parallel support columns 31, 31.

[0041] The fixed body 15 comprises an upper jaw member 32 and a lower jaw member 33 that hold the top plate edge 5 from above and below. The upper jaw member 32 is provided with a vertical rod 34 that can move up and down toward the lower jaw member 33. The vertical rod 34 has an insertion piece 16 formed by the lower end portion 34a, and a gripping portion 34b formed by bending the upper end portion, and is constantly elastically biased downward by a spring 35.

[0042] The attachment and detachment means 17 consists of a locking hole 36 provided in the groove bottom wall 10 of the groove portion 9 on the top plate edge portion 5, corresponding to a predetermined mounting position P on which the handrail frame 4B is attached and fixed, a lower locking hole 37 provided in the lower wall 8 located below the locking hole 36, and the lower end vicinity portion 34a (insertion piece 16) of the vertical rod 34. Therefore, in the second embodiment, the lower end vicinity portion 34a serves both as an insertion piece 16 and as an attachment and detachment means 17.

[0043] The vertical rod 34 is supported by the upper jaw member 32 so as to be able to move up and down and rotate. As shown in Figure 12, when the rod is moved upward against the spring 35 to open the holding space S between the upper and lower jaw members 32 and 33, and rotated approximately 90 degrees via the gripping portion 34b to assume a standby position W, a stopping means 38 is provided to stop the rod from moving downward by locking it in that position so as to be able to lock it in a way that allows it to be locked and detached. In the illustrated example, the stopping means 38 is configured by locking a pin 38a, which also serves as a spring receiver and is inserted radially through the vertical rod 34, to a rib 38b provided inside the upper jaw member 32.

[0044] When the vertical rod 34, which is stopped in the standby position W, is rotated approximately 90 degrees again from the standby position W via the gripping portion 34b, the locking of the stopping means 38 is released, as shown in Figure 13, and the rod is moved downward by the spring 35 through the holding space S. At this time, the mandible member 33 is provided with a fixing hole 39, and is configured to insert the lower end portion 34c of the lower end portion 34a of the vertical rod 34 that has moved downward into the fixing hole 39.

[0045] In the second embodiment, in order to attach and fix the handrail frame 4B, first, as shown in Figures 12 and 14(A), with the vertical rod 34 in a standby position W, the upper and lower jaw members 32 and 33 are brought to face the vertical wall 6 of the top plate edge 5 at any point away from the locking holes 36 and 37 that define the predetermined mounting position P, and the top plate edge 5 is held by the holding space S between the upper and lower jaw members 32 and 33. At this time, when the vertical wall 6 of the top plate edge 5 is brought into contact with the support column 31, the groove 9 is formed to be located directly below the vertical rod 34.

[0046] Therefore, as shown in Figure 14(B), when the knob portion 34b is rotated, the vertical rod 34 is moved downward by the spring 35, and the lower end portion 34c is inserted into the groove portion 9 and elastically contacted with the groove bottom wall 10. Thus, by sliding along the groove portion 9 while the lower end portion 34c rubs against the groove bottom wall 10, the handrail frame 4B can be moved toward the predetermined mounting position P.

[0047] Therefore, as shown in Figure 14(C), when the handrail frame 4B is moved to a predetermined mounting position P along the groove 9, the vertical rod 34 is moved further downward by the spring 28 as soon as its lower end 34c faces the locking hole 36, and the portion 34a near the lower end, including the lower end 34c, is automatically inserted and locked into the locking holes 36 and 37. The lower end 34c is further inserted into the fixing hole 39 of the mandible member 33.

[0048] As a result, the portion 34a (insertion piece 16) near the lower end of the vertical rod 34 is locked and fixed in the groove 9 in a way that prevents it from escaping or sliding, and the handrail frame 4B is attached and fixed to the top plate edge 5 at a predetermined mounting position P.

[0049] By the way, in order to remove the handrail frame 4B, as described above, the vertical rod 34 is moved upward against the spring 35 and the knob portion 34b is rotated to stop it in the standby position W, which opens the holding space S between the upper and lower jaw members 32 and 33, so that the upper and lower jaw members 32 and 33 can be separated from the top plate edge portion 5.

[0050] (Third embodiment) Figures 15 to 17 show a third embodiment of the present invention, in which the accessory 4 constitutes a ladder 4C for ascending and descending to the top plate 2 of the workbench 1, and an auxiliary top plate 41 is provided at the top of the ladder that is joined to the top plate 2 of the workbench substantially flush with it, and is attached and fixed at a predetermined mounting position P.

[0051] The auxiliary top plate 41 constitutes the fixing body 15 by providing a cover member 42 on its end face, and the insertion piece 16 is constituted by a hook piece 43 having a downward-facing claw portion 43a protruding from the cover member 42.

[0052] The attachment and detachment fixing means 17 consists of a clamp 45 provided on the cover member 42 via a bracket material 44, and a predetermined wall portion 8a of the lower wall 8 of the top plate edge portion 5, which is fastened from below by the clamp 45 at a predetermined mounting position P.

[0053] The bracket material 44 includes a horizontal bracket 44a that faces the lower surface of the lower wall 8 of the top plate edge 5 at a distance from each other when the downward claw portion 43a of the hook piece 43 is inserted into the groove portion 9 of the top plate edge 5.

[0054] The clamping device 45 is composed of a bolt 47 that is screwed into a nut 46 fixed to the horizontal bracket 44 and rotated to move vertically, and includes an operating part 48 that rotates the bolt on the lower side of the horizontal bracket 44a, and a pressing part 49 that is rotatably provided on the upper end of the bolt 47 on the upper side of the horizontal bracket 44a.

[0055] In the third embodiment, in order to attach and fix the ladder 4C, as shown in Figure 17(A), the cover member 42 of the auxiliary top plate 41 is positioned at any location away from the predetermined mounting position P, facing the vertical wall 6 of the top plate edge 5, and the downward claw portion 43a of the hook piece 43 is inserted from above toward the groove portion 9. At this time, the clamping device 45 rotates via the operating portion 48, causing the bolt 47 to move downward and the pressing portion 49 to move away from the lower wall 8 of the top plate edge 5.

[0056] In this state, the downward-facing claw portion 43a is inserted into the groove portion 9 and the hook piece 43 is placed on the upper wall 7 of the top plate edge portion 5, so that it can slide along the groove portion 9, and as a result the ladder 4C can be moved to the predetermined mounting position P as shown in Figure 17(B1).

[0057] Therefore, as shown in Figures 16(B) and 17(B2), when the bolt of the clamping device 47 is moved upward via the operating part 48, the pressing part 49 is pressed against the predetermined wall portion 8a of the lower wall 8, which is the predetermined mounting position P of the top plate edge portion 5, and the hook piece 43 is locked and fixed in place so that it cannot escape from the groove portion 9 and cannot slide.

[0058] By the way, in order to remove the ladder 4C, the bolt of the clamp 47 is moved downward via the operating part 48, and with the pressing part 49 separated from the lower wall 8, the auxiliary top plate 41 is lifted, thereby allowing the downward claw portion 43a of the hook piece 43 to escape from the groove 9. [Explanation of symbols]

[0059] 1 Workbench 2 Top plate 2a Divided top panel 3 leg frame 4. Accessories 4A Extension top 4B Handrail frame 4C ladder 5 Edge of top plate 5a Gable veranda frame 5b Digit edge frame 6 Vertical walls 7 Upper wall 8 Lower wall 8a Specified wall section 9 grooves 10 Groove bottom wall 11. Ditch side wall 12, 13 Clamping piece 14 Corner Tools 15 Fixed body 16 Inserts 17 Detachable fastening means 21 End cover (fixing body) 21a Through hole 22 Hook pieces (insertion pieces) 22a Downward claw portion 23 Locking hole (means for attaching and detaching) 24 Locking means (detachable fixing means) 25 Housing 25U Detachable Fixing Unit 25a Guide walkway 25b opening 26 Sideways Rod 27 Locking claws 27a Guide tapered surface 28 Springs 29 bar members 31 Post 32 Maxillary component (fixed body) 33 Mandibular component (fixed body) 34 Vertical rods 34a Lower end vicinity (insertion piece) 34b Thumb part 34c Lower end 35 Spring 36 Locking hole (means for attaching and detaching) 37 Lower locking hole (removable fixing means) 38 Stopping means 38a pin 38b Rib 39 Fixing hole 41 Auxiliary top plate 42 Cover component (fixing body) 43 Hook piece (insertion piece) 43a Downward claw portion 44 Bracket material 44a Horizontal bracket 45 Clamping tools 46 nuts 47 volts 48 Control section 49 Pressing part

Claims

1. A work platform device equipped with a top plate (2) that forms a work platform on which a worker stands, wherein an attachment (4) is attached and fixed to the scaffold device, The top plate edge portion (5) that forms the edge of the top plate is integrally formed with a vertical wall (6) that forms the edge surface, and an upper wall (7) and a lower wall (8) that extend substantially horizontally from the upper and lower ends of the vertical wall, and a groove portion (9) is recessed in the upper wall parallel to the edge surface, so that the groove portion has a groove bottom wall (10) and groove side walls (11,11) inside the groove portion. The aforementioned accessory (4) comprises a fixing body (15) facing the edge portion (5) of the top plate, and an insertion piece (16) is extended from the fixing body so as to be slidably inserted into the groove portion (9) from the outside of the edge portion of the top plate. An attachment and fixing device for an accessory in a work scaffolding device equipped with a top plate, characterized in that, when the insertion piece (16) of the fixing body is inserted into the groove (9) and slid to move to a predetermined mounting position (P) on the edge of the top plate, a detachable fixing means (17) is provided to detachably fix the insertion piece (16) between the fixing body (15) and the edge of the top plate (5) such that it cannot escape from the groove (9) and cannot slide.

2. The aforementioned accessory (4) constitutes a substantially rectangular extension top plate (4A) that connects the top plates of both scaffolding devices when the pair of scaffolding devices are positioned spaced apart. The extension top plate has an end cover (21) that covers and fixes both ends in the longitudinal direction in the short direction, forming the fixing body (15), and an insertion piece (16) that has a hook piece (22) with a downward-facing claw portion (22a) protruding from the end cover. The attachment and detachment means (17) consists of a locking hole (23) provided in the vertical wall (6) of the edge portion (5) of the extension top plate corresponding to a predetermined mounting position (P) of the extension top plate, and a locking means (24) provided so as to be able to move back and forth in the direction of protrusion from the end cover (21). The attachment and fixing device for an accessory in a work scaffolding device equipped with a top plate according to claim 1, characterized in that the end cover (21) of the extension top plate faces the vertical wall (6) of the edge of the top plate, and the extension top plate is moved to a predetermined mounting position (P) by inserting the downward claw portion (22a) of the hook piece (22) into the groove portion (9) and sliding it, and the locking means (24) is advanced in the protruding direction and inserted into the locking hole (23), thereby locking and fixing the hook piece (22) so that it cannot escape from the groove portion (9) and cannot slide.

3. In the mounting and fixing device according to claim 2, The locking means (24) consists of a horizontal rod (26) that is movable back and forth in a housing (25) fixed to the underside of the extension top plate inside the end cover, a locking claw (27) at the tip of the horizontal rod, and a spring (28) that biases the horizontal rod in the forward direction so that the locking claw (27) protrudes from the insertion hole (21a) of the end cover. A guide tapered surface (27a) is provided on the lower surface of the locking claw (27), An attachment and fixing device for an accessory in a work scaffolding device equipped with a top plate, characterized in that when the downward claw portion (22a) of the hook piece is inserted from above toward the groove portion (9), the guide tapered surface (27a) of the locking claw abuts against the vertical wall (6) of the top plate edge, causing the horizontal rod (26) to move backward against the spring (28), and when the extension top plate is moved to a predetermined mounting position (P), the horizontal rod moves forward by the spring, inserting and locking the locking claw (27) into the locking hole (23).

4. The aforementioned accessory (4) constitutes a handrail frame (4B) equipped with a support column (31) erected from the vertical wall of the edge of the top plate, and the fixing body (15) is provided on the support column. The fixing body (15) comprises an upper jaw member (32) and a lower jaw member (33) that hold the top plate edge (5) from above and below. The upper jaw member (32) is provided with a vertical rod (34) that is movable vertically toward the lower jaw member and biased downward via a spring (35), and the insertion piece (16) is formed by the portion near the lower end (34a) of the vertical rod. The attachment and detachment means (17) is configured by inserting and locking the insertion piece (16) of the vertical rod (34) into a locking hole (36) provided in the groove bottom wall (10) of the groove portion of the edge of the top plate, corresponding to a predetermined mounting position (P) of the handrail frame. The attachment and fixing device for an accessory in a work scaffolding device equipped with a top plate according to claim 1, characterized in that the top plate edge (5) is held in the holding space (S) between the upper and lower jaw members (32, 33) which is opened by moving the vertical rod upward against the spring, and the insertion piece (16) is elastically brought into contact with the groove bottom wall (10) of the groove by moving the vertical rod (34) downward with the biasing force of the spring (35), and the insertion piece is slid along the groove bottom wall to move the handrail frame to a predetermined mounting position (P), thereby inserting and locking the insertion piece (16) of the downwardly biased vertical rod into the locking hole (36).

5. In the mounting and fixing device according to claim 4, The top plate edge portion (5) is located below the locking hole (36) provided in the groove bottom wall (10) of the groove portion, and the lower wall (8) is provided with a lower locking hole (37). The lower jaw member (33) of the fixed body is provided with a fixing hole (39) into which an insertion piece at the lower end is inserted when the vertical rod is moved downward. An attachment and fixing device for an accessory in a work scaffolding device equipped with a top plate, characterized in that, with the top plate edge (5) held in the holding space (S) between the upper and lower jaw members (32, 33) and the handrail frame moved to a predetermined mounting position (P), the insertion piece (16) of a vertical rod, which is moved downward by the biasing force of a spring (35), is inserted through the locking hole (36) and the lower locking hole (37) of the top plate edge, and the lower end (34c) of the insertion piece is further inserted into the fixing hole (39).

6. The aforementioned accessory (4) constitutes a ladder (4C) for workers to ascend and descend from the floor surface on which the work scaffolding device is installed to the top plate, and an auxiliary top plate (41) is provided at the top of the ladder that is joined to the top plate of the work scaffolding board in a manner almost flush with it. The auxiliary top plate (41) is configured as the fixing body (15) by providing a cover member (42) on its end face, and the insertion piece (16) is configured as a hook piece (43) with a downward-facing claw portion (43a) protruding from the cover member. The attachment and detachment means (17) consists of a clamp (45) provided on the cover member (42) via a bracket material (44), and a lower wall (8) of the top plate edge that is fastened from below by the clamp at a predetermined mounting position (P). The bracket material (44) includes a horizontal bracket (44a) that faces the lower surface of the lower wall (8) of the top plate edge at a distance from each other when the downward claw portion (43a) of the hook piece is inserted into the groove portion (9) of the top plate edge. The clamping device (45) is composed of a bolt (46) that is screwed into a nut (46) fixed to the horizontal bracket (44a) and rotated to be movable in the vertical direction, an operating part (48) that rotates the bolt on the lower side of the horizontal bracket, and a pressing part (49) provided on the upper end of the bolt on the upper side of the horizontal bracket. The attachment and fixing device for an accessory in a work scaffolding device equipped with a top plate according to claim 1, characterized in that the cover member (42) of the auxiliary top plate faces the vertical wall (6) of the top plate edge (5), the downward claw portion (43a) of the hook piece is inserted into the groove (9) and slid to move the ladder to a predetermined mounting position (P), the bolt (47) of the clamping device is moved upward via the operating part (48), and the pressing part (49) is pressed against the lower wall (8) of the top plate edge, thereby locking and fixing the hook piece (43) in a way that prevents it from escaping and sliding out of the groove (9).

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