JP7638517B2 - Folding workbench - Google Patents

Description

The present invention relates to a folding work platform with foldable main landing gear, etc.

A folding workbench that can be folded so that the main legs overlap the top plate and can be carried is known to have a horizontal rail provided above the side edge of the top plate to allow the worker to identify the position of the side end face of the top plate (for example, Patent Documents 1 to 3).

The folding workbench disclosed in Patent Document 1 has handrails pivotally connected to the four corners of the tabletop, and a crossbar (safety bar) is provided between the tips of a pair of handrails on the long side of the tabletop. One end of the crossbar is pivotally connected to the tip of one of the handrails, and the other end is detachably connected to the tip of the other handrail. The crossbar is made up of multiple tubes of different thicknesses connected together in a nested manner, and can be extended and shortened in multiple stages in the length direction. Therefore, when folding, the other end of the crossbar is released from the connection between the tip of the handrail and the other end of the crossbar, and the crossbar is shortened and rotated toward the handrail bar around the one end. This allows the crossbar to be overlapped along the handrail bar. Furthermore, by rotating the handrail bar toward the tabletop in this state, the crossbar and the handrail bar can be overlapped along the side edge of the tabletop.

The folding workbench disclosed in Patent Document 2 has handrail posts (handrail supports) pivotally connected to each of the four corners of the top plate, and a crossbar (handrail rail) is provided between the tips of a pair of handrail bars on the long side of the top plate. The crossbars are configured to be separable at the middle, and the base ends of each crossbar half are pivotally connected to the tip of the handrail bar. Therefore, when folding, the tips of the crossbar halves are released from their mutual connection, and then each is rotated toward the handrail bar around its base end. This allows the crossbar to be overlapped along the handrail bar. Furthermore, in this state, the handrail bar can be rotated toward the main landing gear, allowing the crossbar and the handrail bar to be overlapped along the side edge of the main landing gear.

The folding workbench disclosed in Patent Document 3 has handrails pivotally connected to each of the four corners of the tabletop, and a crossbar (guard bar) is provided between the tips of a pair of handrails on the long side of the tabletop. Rails are provided on the side of the crossbar, while support rollers are provided at the tips of the handrails, and the support rollers are engaged with the rails so that they can roll. Therefore, when folding, the handrails are tilted toward the tabletop, while the crossbars are lowered toward the tabletop. This allows the handrails and the crossbars to be overlapped along the side edges of the tabletop.

JP 2013-2205 A JP 2014-37772 A JP 2014-173378 A

However, in the folding workbenches of Patent Documents 1 to 3, because the cross bars are connected and supported between the upper ends of the handrails, every time a worker grasps the handrail to ascend or descend, a load is applied to the connection between the handrail and the cross bar and to the cross bar itself, which may cause deformation or damage. In particular, in the folding workbenches of Patent Documents 1 and 2, because the cross bars are made up of multiple frame members (cylinders, cross bar halves) connected in the length direction, there is a risk of rattling, deformation, or damage occurring at the joints between these frame members.

On the other hand, in the folding workbench of Patent Document 3, the up and down movement of the cross bars and the rotation of the handrails can be performed simultaneously in conjunction with each other when unfolding or folding, which can reduce the amount of work required to some extent. However, with this workbench, the direction in which the cross bars are moved and the direction in which the tip of the handrails (the part that connects to the cross bars) move are different when unfolding or folding, so there is a problem that the cross bars and the handrails swing in unintended directions or angles, making it impossible to unfold or fold correctly and smoothly. As a result, there is a risk that the workbench will be used in an inappropriately unfolded state or carried in an insufficiently folded state. There is also a risk that the worker's hands or fingers will be caught between the top board and the cross bars or handrails when they swing in an unintended direction or angle.

The present invention was made in consideration of the above problems, and aims to provide a folding workbench with cross bars that is highly durable and can be correctly and smoothly unfolded and folded.

To solve the above problems, the folding workbench of the present invention employs the following technical measures.

The folding workbench of the present invention is a folding workbench comprising a substantially rectangular top plate, main legs pivotally connected to the top plate and extending below the top plate, handrails pivotally connected to the top plate or the main legs and extending above the main legs, and a girder side cross bar arranged horizontally above the long edge of the top plate, characterized in that the folding workbench comprises a pair of pillars pivotally connected to the long edge and extending above the top plate , spaced apart from each other in the longitudinal direction of the top plate , and the girder side cross bar is slidably connected to the pillars in the extension direction of the pillars .

Preferably, the girder side cross rail is provided with a connecting portion that connects to the support pillar, and the support pillar is provided with a guide portion that guides the connecting portion along the extension direction of the support pillar .

Preferably, the support pillar is provided at its tip with a connecting and fixing part that can hold the girder-side cross rail in both an unfolded state in which it stands upright at a right angle to the top plate, and a folded state in which it is tilted approximately parallel to the top plate.

Preferably, the top plate is provided with a gable side cross bar that is arranged horizontally above the short edge portion of the top plate, the girder side cross bar being arranged above one and the other long edge portions of the top plate, one end of the gable side cross bar being pivotally connected to the girder side cross bar on one side and the other end being configured to be able to be engaged and held by the girder side cross bar on the other side, and the girder side cross bar on one side being provided with a storage portion that can store the gable side cross bar along the extension direction of the girder side cross bar .

According to the folding workbench of the present invention, the girder side crossbar is connected to a pair of support posts that are provided separately from the handrail, so even if the worker holds the handrail when ascending or descending, no load is placed on the girder side crossbar. This significantly improves the durability of the folding workbench as a whole. In addition, with this folding workbench, when unfolding or folding, the girder side crossbar can be slid along a pair of support posts that extend above the top plate, so the girder side crossbar or support posts do not swing in an unintended direction or angle. This also enables correct and smooth unfolding and folding.

FIG. 2 is a perspective view of the folding workbench of the embodiment. FIG. 2 is a front view of the folding workbench of the embodiment. FIG. 2 is a left side view of the folding workbench of the embodiment. FIG. 2 is a right side view of the folding workbench of the embodiment. FIG. 2 is a plan view of the folding workbench of the embodiment. FIG. 2 is a bottom view of the folding workbench of the embodiment. FIG. 2 is a perspective view of the folding workbench of the embodiment in a folded state. FIG. 2 is a front view of the folding workbench of the embodiment in a folded state. FIG. 2 is a plan view of the folding workbench of the embodiment in a folded state. FIG. 2 is an enlarged front view of the upper part of the folding workbench of the embodiment. FIG. 4 is an enlarged front view of the periphery of a short edge of the top plate. FIG. 1 is an enlarged perspective view of the periphery of a connection portion between a top plate and a main leg. FIG. 2 is an enlarged perspective view of the periphery of a connection portion between the top plate and the main legs. FIG. 1 is an enlarged perspective view of the periphery of a side end of a girder surface sensing bar. FIG. 2 is an enlarged perspective view of the periphery of the side end of the girder surface sensing bar. FIG. 3 is an enlarged perspective view of the periphery of the side end of the girder surface sensing bar. FIG. 2 is an enlarged perspective view of the periphery of the side end of the girder surface sensing bar. FIG. 13 is an enlarged plan view of the periphery of the side end of the girder surface sensing bar. FIG. 13 is an enlarged perspective view of a side end of the girder surface sensing bar. 13 is a perspective view of the periphery of a connection portion between the top plate and the sliding support column. FIG. 13 is an enlarged perspective view of the periphery of the tip of the slide support in a folded state. FIG. 13A is a schematic plan view and FIG. 13B is a schematic front view of the vicinity of the connection between the girder surface sensing bar and the slide support in a folding workbench of another embodiment.

The folding workbench according to the embodiment of the present invention will be described below with reference to the drawings. Note that the embodiment described below is an example of the present invention, and the configuration of the present invention is not limited to this specific example.

As shown in Figures 1 to 6, the folding workbench 1 of this embodiment includes a top plate 2, main legs 3, handrails 4, girder surface sensing bars (girder side cross bars) 5, slide supports (supports) 6, and end surface sensing bars (end side cross bars) 7.

The top plate 2 is a plate body that is generally rectangular when viewed from above. In this embodiment, the longitudinal direction of the top plate 2 is the left-right direction, the lateral direction of the top plate 2 is the front-rear direction, and the thickness direction of the top plate 2 is the up-down direction of the folding workbench 1. In addition, in this embodiment, the configuration in the unfolded state will be described as the basis, except when describing the folded state.

The main landing gear 3 is pivotally connected to the short edge 2S of the top plate 2 and extends below the top plate 2. The handrail 4 is pivotally connected to the main landing gear 3 and extends above the main landing gear 3. The girder surface sensing bar 5 is horizontally provided above the long edge 2L of the top plate 2. The slide support 6 is pivotally connected to the long edge 2L of the top plate 2 and extends above the top plate 2. The end surface sensing bar 7 is horizontally provided above the short edge 2S of the top plate 2. The folding workbench 1 can be folded flat as shown in Figures 7 to 9 by rotating or sliding the main landing gear 3, handrail 4, girder surface sensing bar 5, slide support 6, and end surface sensing bar 7 relative to their respective supports.

The long edge 2L of the top plate 2 is provided with hinges 8 that pivotally connect the main legs 3. The hinges 8 are provided at positions near the left and right ends of the front and rear long edges 2L, i.e., at the front and rear positions of the short edges 2S, respectively, and the main legs 3 are connected and supported by the pair of front and rear hinges 8.

The main legs 3 are configured in a ladder shape with a pair of front and rear leg bodies 12 and multiple steps 13. The main legs 3 are pivotally connected to the left and right positions of the tabletop 2, and extend diagonally downward on the left and right sides when viewed from the front. The main legs 3 are also configured to be rotatable within an angular range from an extended position (see Figure 2) extending below the tabletop 2 to a folded position (see Figure 8) extending along the underside of the tabletop 2 and approximately parallel to the tabletop 2.

The leg body 12 is a long frame body with a roughly U-shaped cross section. On the other hand, the step 13 is a long frame body with a roughly rectangular cross section. The leg body 12 is connected to the hinge portion 8 at the base end 3A and extends downward. In this embodiment, the leg body 12 extends diagonally downward and outward from the front to the rear when viewed from the side. In other words, the distance between the front and rear leg bodies 12 increases from top to bottom. A plurality of steps 13 are arranged side by side at a predetermined distance in the vertical direction in the above-mentioned gap.

As shown in Figures 10 to 13, the base end 3A of the leg body 12 is provided with a bracket 14 that rotatably supports the handrail 4. More specifically, the bracket 14 has a roughly U-shaped base 14A that is fixed to the leg body 12, and a roughly L-shaped connecting frame 14B formed on the middle plate 14S of the base 14A. The connecting frame 14B has a back plate 14C that stands upright from the middle plate 14S of the base 14A toward the outside of the leg body 12 (the opposite side to the top plate 2), and an outer plate 14E that extends from the outer edge of the back plate 14C at a predetermined interval and roughly parallel to the middle plate 14S. The handrail 4 is inserted into the gap between the middle plate 14S and the outer plate 14E.

As shown in Figures 1 to 13, the handrail bar 4 is a long frame body with a generally rectangular cross section. The handrail bar 4 is connected to the base end 3A of the front and rear leg bodies 12, respectively, and extends diagonally inward and upward on the left and right sides when viewed from the front. The base end 4A of the handrail bar 4 is inserted into the gap between the middle plate portion 14S and the outer plate portion 14E of the bracket 14, and is connected and supported by the pivot 15. The pivot 15 is provided between the approximate centers of the middle plate portion 14S and the outer plate portion 14E. In other words, the base end 4A of the handrail bar 4 is connected and supported to be rotatable around the pivot 15 provided at the approximate center position of the bracket 14. Therefore, when the handrail bar 4 is rotated upward around the pivot 15 as a fulcrum, it abuts on the upper half of the back plate portion 14C of the bracket 14, and is held in a position extended above the main leg 3. On the other hand, when it is rotated downward around the pivot 15 as a fulcrum, it comes into contact with the lower half of the back plate 14C and is held in a position extended in the same direction as the main legs 3. In addition, the middle plate 14S has fixing holes 16 at upper and lower positions, sandwiching the insertion portion of the pivot 15, through which the lock pin 17A described below can be inserted.

The base end 4A of the handrail rod 4 is provided with a lock pin 17A to prevent the handrail rod 4 from rotating. The lock pin 17A is a cylindrical rod bent into an approximately L-shape, and is configured to be slidable in the forward and backward directions, which is the extension direction, at the pin support portion 17B of the base end 4A. Therefore, when the handrail rod 4 is rotated upward and the lock pin 17A is inserted and engaged with the fixing hole (not shown) on the upper side of the bracket 14, the handrail rod 4 is fixed and held in a rotation-stopped state in the deployed position extended above the main leg 3. On the other hand, when the handrail rod 4 is rotated downward and the lock pin 17A is inserted and engaged with the fixing hole 16 on the lower side of the bracket 14, the handrail rod 4 can be fixed and held in a rotation-stopped state in the folded position extended along the outer surface of the main leg 3.

The handrail 4 may be pivotally connected to the top plate 2, similar to the sliding support 6. In this case, it is preferable that the handrail 4 is configured so that it is fixed and held in place without turning at the deployed position where it extends above the main legs 3, and at the folded position where it extends along the long edge 2L of the top plate 2, so that the whole structure is flat when folded.

As shown in Figures 14 to 18, the girder surface sensing bar (beam side crosspiece) 5 is a long frame body with a roughly U-shaped cross section, and a groove-like recess 5S is formed on its inner surface (surface on the tabletop 2 side) between both ends. The girder surface sensing bar 5 extends roughly horizontally in the left-right direction (longitudinal direction) of the tabletop 2, and is supported from below by a slide support 6. The girder surface sensing bar 5 is provided above the long edge portions 2L on one side (front side) and the other side (rear side) of the tabletop 2. In this embodiment, the girder surface sensing bar 5 is positioned at a height that abuts against the lower legs (near the thighs of an average adult) of a worker standing on the tabletop 2, and by abutting against the lower legs of the worker, the worker can recognize the positions of the girder surfaces (end faces of the long edge portions 2L) on the front and rear of the tabletop 2 without visually checking them.

The girder surface sensing bar 5 is connected to the sliding support 6 so as to be slidable in the extending direction of the sliding support 6. Also, as shown in Figures 17 to 19, a connector 18 is provided at the side end 5A of the girder surface sensing bar 5 as a connecting part connecting to the sliding support 6. The connector 18 protrudes outward from the outer surface (the surface opposite the top plate 2) of the girder surface sensing bar 5. A flange 18A is formed at the tip of the connector 18, bulging outward along its periphery.

The side end 5A of the girder surface sensing bar 5 is provided with a first fixing hole 19 for fixing and holding the slide support 6, and a hook portion 20 for hooking and supporting the girder surface sensing bar 5 at a lateral position of the tabletop 2. The first fixing hole 19 is a through hole provided on the outer surface of the girder surface sensing bar 5 (the surface opposite the tabletop 2). The hook portion 20 is a notch formed in a roughly inverted U-shape recessed from the underside of the girder surface sensing bar 5 toward the top, and opens below the girder surface sensing bar 5. The hook portion 20 is provided on each of the left and right side end portions 5A of the girder surface sensing bar 5.

Furthermore, as shown in Figures 14 to 17, a connecting hole 21 is provided at the side end 5A of the girder surface sensing bar 5 for connecting the end surface sensing bar 7. The connecting hole 21 is a through hole and is provided on the underside of the girder surface sensing bar 5.

As shown in Figures 10, 14, and 15, the girder surface sensing bar 5 is provided, in a substantially central position between the left and right sides, with a second fixing hole 22 for fixing and holding the slide support 6 in a folded state, a support hook 23 for supporting the slide support 6 from below, and a hooking hole 24 as a hooking portion capable of hooking and holding the tip 7B of the gable surface sensing bar 7. The second fixing hole 22 is a through hole and is provided on the outer surface of the girder surface sensing bar 5 (the surface opposite the top plate 2). The support hook 23 is a plate member bent into a substantially L-shape and is provided on the outer surface of the girder surface sensing bar 5 with the bent portion at the tip facing upward. The hooking hole 24 is a through hole and is provided on the underside of the girder surface sensing bar 5.

As shown in Figures 10 to 18, the sliding support (support) 6 is a long frame body with a substantially rectangular cross section, and a pair of sliding support columns 6 are provided at substantially symmetrical positions on the left and right sides of the long edge 2L of the tabletop 2. The pair of sliding support columns 6 are erected at positions close to the left and right ends of one (front side) and the other (rear side) of the long edge 2L , respectively. That is, the pair of sliding support columns 6 are provided spaced apart from each other in the left-right direction (longitudinal direction) of the tabletop 2. The base ends 6A of the sliding support columns 6 are each connected and supported by the long edge 2L of the tabletop 2 via a pivot 25. That is, the sliding support columns 6 are connected and supported to be rotatable around the pivot 25 with respect to the long edge 2L of the tabletop 2.

Between the base end 6A of the slide support 6 at the pivot 25 and the long edge 2L of the tabletop 2, a generally cylindrical spacer (not shown) with a larger diameter than the pivot 25 is fitted. The spacer is set to a length that is generally the same as the front-to-back width of the girder surface sensing bar 5. Therefore, a gap S1 of generally the same width as the front-to-back width of the girder surface sensing bar 5 is always defined between the base end 6A of the slide support 6 and the long edge 2L of the tabletop 2. The pivot 25 (actually, the spacer fitted around the pivot 25) is laid horizontally exposed to the gap S1.

As shown in Figures 12, 13, 16, and 20, a support stay 2P for supporting the slide support 6 in an upright position is provided below the girder surface sensing bar 5 on the long edge 2L of the tabletop 2. The support stay 2P is a plate member bent into a substantially L-shape, and is provided on the end surface of the long edge 2L side of the tabletop 2 with the bent tip facing downward. A fixing hole 26 for fixing and holding the slide support 6 is provided in the bent tip of the support stay 2P. The length of protrusion of the support stay 2P to the outside of the tabletop 2 (front-to-back direction) is set to be substantially the same as the front-to-back width of the girder surface sensing bar 5.

A first locking mechanism 27 capable of preventing the rotation of the sliding support 6 is provided at the base end 6A of the sliding support 6. As shown in Figures 11 to 13 and 20, the first locking mechanism 27 includes a locking pin 27A, a pin support portion 27B, and a spring member (not shown). The locking pin 27A is a cylindrical rod bent into a substantially L-shape, and is supported by the pin support portion 27B so that it can slide in the front-rear direction, which is the extension direction of the locking pin 27A. The locking pin 27A is biased by the spring member so that its tip protrudes outward from the inner surface of the sliding support 6 (the surface facing the top plate 2).

Therefore, by erecting the sliding support 6 at a substantially right angle to the tabletop 2 and inserting and engaging the lock pin 27A into the fixing hole 26 of the support stay 2P, the sliding support 6 is fixed and held in a position erected at a substantially right angle to the tabletop 2. On the other hand, if the lock pin 27A is pulled in the direction opposite to the protruding direction against the pressing force of the spring member and removed from the fixing hole 26, the fixed state of the sliding support 6 to the girder surface sensing bar 5 is released. As a result, the sliding support 6 can freely rotate around the pivot 25 in its circumferential direction.

As shown in Figures 14 to 18, the slide support 6 is provided with a groove 28 as a guide portion for guiding the connector 18 of the girder surface sensing bar 5 along the extending direction of the slide support 6. More specifically, the groove 28 is formed on the side surface of the slide support 6 on the top plate 2 side, from the base end 6A to the tip end 6B. An inner rib 28A is formed protruding from the inside of the groove 28 along the extending direction. The flange 18A provided on the outer periphery of the tip of the connector 18 engages with the inner rib 28A from the inside of the groove 28. As a result, the girder surface sensing bar 5 is connected and held in the groove 28 in a non-dislodging and slidable state.

The tip 6B of the slide support 6 is provided with a second locking mechanism 29 as a connecting and fixing part capable of fixing and holding the girder surface sensing bar 5 in both the unfolded state where it stands at a right angle to the top plate 2 and the folded state where it is inclined approximately parallel to the top plate 2. As shown in Figures 17 and 18, the second locking mechanism 29, like the first locking mechanism 27, is provided with a locking pin 29A, a pin support part 29B, and a spring member (not shown). The locking pin 29A is a cylindrical rod bent into an approximately L-shape and is supported by the pin support part 29B so that it can slide in the front-rear direction, which is the extension direction. In addition, the locking pin 29A is pressed and urged by the spring member so that the tip protrudes outward from the inner surface (surface on the top plate 2 side) of the slide support 6.

Therefore, by erecting the left and right sliding supports 6 at approximately right angles to the tabletop 2 and inserting and engaging the lock pin 29A into the first fixing hole 19 of the girder surface sensing bar 5, the girder surface sensing bar 5 is fixed and supported at the tip 6B of the left and right sliding supports 6 in a position approximately parallel to the tabletop 2. On the other hand, if the lock pin 29A is pulled in the opposite direction to the protruding direction against the pressing force of the spring member and removed from the first fixing hole 19, the fixed state of the girder surface sensing bar 5 to the tip 6B of the sliding support 6 is released. As a result, the girder surface sensing bar 5 can slide freely up and down along the sliding supports 6 that stand on the left and right while remaining in a position approximately parallel to the tabletop 2.

As described above, by sliding the girder surface sensing bar 5 along the slide support 6 toward the base end 6A, the hooks 20 provided on both side ends 5A of the girder surface sensing bar 5 are hooked onto the pivots 25 pressed into the gap S1 between the base end 6A and the tabletop 2. That is, the girder surface sensing bar 5 is hooked onto the pivots 25 at both side ends 5A. As a result, the girder surface sensing bar 5 is held in a position where its top surface is flush with the top surface of the tabletop 2.

After sliding the girder surface sensing bar 5 along the sliding support 6 to the pivot 25 below it, the sliding support 6 is tilted to a position where it is approximately parallel to the top plate 2, and the lock pin 29A of the second locking mechanism 29 is inserted and engaged with the second fixing hole 22 of the girder surface sensing bar 5, so that the sliding support 6 is fixed and held in a tilted position along the girder surface sensing bar 5. The girder surface sensing bar 5 is also fixed and held in a position approximately parallel to the top plate 2 by the two second locking mechanisms 29. At this time, the sliding support 6 is supported from below by the support hook 23 as shown in FIG. 21, and the side surface portion located on the upper side is held in a position where it is flush with the upper surface portion of the girder surface sensing bar 5. On the other hand, if the lock pin 29A is pulled in the opposite direction to the protruding direction against the pressing force of the spring member and removed from the fixing hole 22, the fixed state of the sliding support 6 to the girder surface sensing bar 5 is released. As a result, the slide support 6 can freely rotate around the pivot 25 in its circumferential direction.

As shown in Fig. 1 and Figs. 14 to 17, the end surface sensing bar (end side horizontal bar) 7 is a cylindrical rod bent into an approximately U-shape and is provided above one (left side) and the other (right side) short edge portion 2S of the tabletop 2. The end surface sensing bar 7 extends approximately horizontally in the front-to-rear direction (short side direction) of the tabletop 2 and is connected and supported by the side end portion 5A of the girder surface sensing bar 5 that faces the front and rear. In this embodiment, the end surface sensing bar 7, like the girder surface sensing bar 5, is positioned at a height that abuts against the lower legs (near the thighs of an average adult) of a worker standing on the tabletop 2, and by abutting against the worker's lower legs, the worker can recognize the positions of the left and right end surfaces (end faces of the short edge portions 2S) of the tabletop 2 without visually checking them.

The end face sensing bar 7 is installed horizontally between the girder face sensing bars 5 so that the bent ends 7A, 7B at both ends extend downward, and the bent end (one end) 7A at one end is pivotally connected to the girder face sensing bar 5 on one side, while the bent end (other end) 7B at the other end is configured to be able to engage and be held by the girder face sensing bar 5 on the other side. In other words, the end face sensing bar 7 is connected to the girder face sensing bar 5 so that it can rotate around the bent end 7A at one end.

Therefore, the end face sensing bar 7 can be accommodated in the recess 5S on the inside surface of the girder face sensing bar 5 along the extension direction of the girder face sensing bar 5 by releasing the hooked state of the bent end portion 7B on the other end side and rotating it so as to overlap the girder face sensing bar 5 on the supporting side around the bent end portion 7A on one end side. At this time, the bent end portion 7B on the other end side can be hooked and held in the hook hole 24 of the girder face sensing bar 5.

Thus, the folding workbench 1 of the above embodiment comprises a substantially rectangular top plate 2, a main leg 3 pivotally connected to the top plate 2 and extending below the top plate 2, a handrail 4 pivotally connected to the top plate 2 or the main leg 3 and extending above the main leg 3, and a girder surface sensing bar (girder side cross bar) 5 installed horizontally above the long edge 2L of the top plate 2, and a pair of sliding supports (supports) 6 pivotally connected to the long edge 2L and extending above the top plate 2 , spaced apart from each other in the longitudinal direction of the top plate 2 , and the girder surface sensing bar 5 is connected to the sliding supports 6 so as to be slidable in the extension direction of the sliding supports 6 .

According to this configuration, the girder surface sensing bar 5 is connected to a pair of slide supports 6 provided separately from the handrail 4, so even if the worker holds the handrail 4 when ascending or descending, no load is placed on the girder surface sensing bar 5. This significantly improves the durability of the folding workbench 1 as a whole. In addition, with this structure, when unfolding or folding, the girder surface sensing bar 5 can be slid along the pair of slide supports 6 extended above the top plate 2, so the girder surface sensing bar 5 and the slide supports 6 do not swing in an unintended direction or angle. Therefore, correct and smooth unfolding and folding are possible.

In addition, a connector (connecting portion) 18 that connects to the sliding support 6 is provided on the girder surface sensing bar 5, and a groove portion (guide portion) 28 that guides the connector 18 along the extension direction of the sliding support 6 is provided on the sliding support 6.

This configuration allows the girder surface sensing bar 5 to slide more smoothly in the extension direction of the sliding support 6 when unfolding or folding, making unfolding and folding more reliable and smoother.

The sliding support 6 is also provided at its tip 6B with a second locking mechanism (connecting and fixing part) 29 that can securely hold the girder surface sensing bar 5 in both the unfolded state in which it stands upright at a right angle to the tabletop 2, and the folded state in which it is tilted approximately parallel to the tabletop 2.

With this configuration, the second locking mechanism 29 provided at the tip 6B of the sliding support 6 allows the sliding support 6 to be connected and fixed to the girder surface sensing bar 5 in the unfolded state, or connected and fixed to the girder surface sensing bar 5 in the folded state, allowing for smoother and easier unfolding and folding.

It also has an end surface sensing bar (end side horizontal bar) 7 that is installed horizontally above the short edge 2S of the tabletop 2, and girder surface sensing bars 5 are respectively installed above one and the other long edge 2L of the tabletop 2, and the end surface sensing bar 7 is configured so that a bent end (one end) 7A on one end is pivotally connected to the girder surface sensing bar 5 on one side and a bent end (other end) 7B on the other end can be hooked and held by the girder surface sensing bar 5 on the other side, and the girder surface sensing bar 5 on the one side is provided with a recess (accommodating portion) 5S that can accommodate the end surface sensing bar 7 along the extension direction of the girder surface sensing bar 5 .

With this configuration, the end surface sensing bar 7 can be stored in the recess 5S of the girder surface sensing bar 5 on one side along its extension direction by releasing the engagement state of the bent end portion 7B on the other end side with the girder surface sensing bar 5 on the other side and rotating it so that it overlaps with the girder surface sensing bar 5 on one side around the bent end portion 7A on one end side. This prevents the end surface sensing bar 7 from getting caught on the top plate 2 or other parts when unfolding or folding. This allows for more reliable and smooth unfolding and folding.

In the above embodiment, the girder surface sensing bar 5 is slidably connected to the sliding support 6 by inserting and engaging the connector 18 provided on the girder surface sensing bar 5 into the groove 28 provided on the sliding support 6. However, as shown in FIG. 22, the girder surface sensing bar 5 may be provided at its side end 5A with a substantially rectangular tubular or U-shaped support retainer 30 that can engage with the outer circumferential surface of the sliding support 6, and the support retainer 30 may engage with the outer circumferential surface of the sliding support 6, thereby slidably connecting the girder surface sensing bar 5 to the sliding support 6.

1 Folding workbench 2 Top plate 2L Long edge 2S Short edge 3 Main landing gear 4 Handrail 5 Girder surface sensing bar (girder side crosspiece)
5S Recess (container)
6 Slide support (support)
6A Tip (tip of the support)
7 Gable side detection bar (gable side crosspiece)
7A Bent end on one end (one end of the gable side crosspiece)
7B: Bent end on the other end (other end of gable side crosspiece)
18 Connector (connection part)
24 Engagement hole (engaged part)
28 Groove (Guide)
29 Second lock mechanism (connection fixing part)

Claims (4)

A folding workbench including a generally rectangular top plate, main landing gear pivotally connected to the top plate and extending below the top plate, a handrail pivotally connected to the top plate or the main landing gear and extending above the main landing gear, and a girder-side horizontal rail horizontally disposed above a long edge of the top plate,
A pair of support columns are pivotally connected to the long edge portion, extend above the tabletop , and are spaced apart from each other in the longitudinal direction of the tabletop ,
The girder side cross bar is a folding workbench slidably connected to the support pillar in the extension direction of the support pillar . A connecting portion that connects to the support column is provided on the girder side cross beam,
The folding workbench according to claim 1 , wherein the support pole is provided with a guide portion for guiding the connecting portion along an extension direction of the support pole . The folding workbench according to claim 1 or 2, wherein the support pillar has a connecting and fixing part at the tip thereof that can fix and hold the girder-side cross rail in both an unfolded state in which the support pillar stands at a right angle to the top plate, and a folded state in which the support pillar is inclined approximately parallel to the top plate. A gable side crosspiece is provided at an upper position of the short edge portion of the top plate,
The girder side cross beams are provided above one and the other long edge portions of the top plate,
The gable side cross beam is pivotally connected at one end to the girder side cross beam on the one side, and the other end is configured to be hooked and held by the girder side cross beam on the other side,
A folding workbench as described in any one of claims 1 to 3, wherein the girder side cross bar on one side is provided with a storage section capable of storing the gable side cross bar along the extension direction of the girder side cross bar .

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