JP2003082847A - Folding work bench - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a folding work bench capable of always safely standing on a tread 12 without bending a worker backward since the tread 12 is formed in a curved shape, even if a widely opened angle of front and rear struts 2 and 3 is narrowed to raise a position of a scaffolding board 1. SOLUTION: The upper ends of a pair of rear struts 3 are mounted to the rear sections on both right and left sides of the scaffolding board 1 with a pivot 15 and a clamping device 16, and an expansion pipe 34 is provided to the lower end of the rear struts 3 in an expansible manner. The upper end of a pair of front struts 2 is mounted to the front sections on both right and left sides of the scaffolding board 1 with a pivot 8. A rung 7 having the curved tread 12 and providing a rib 13 to the inside thereof is erected between a pair of front struts 2. An expansible reinforcing member 5 is erected between an intermediate position of the front struts 2 and the lower end of the rear struts 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable workbench, and more particularly to a scaffolding board, a front strut and a rear portion by shortening the length of a reinforcing member installed between the rear strut and the front strut. The present invention relates to a foldable workbench that can be folded in parallel with a column.

[0002]

2. Description of the Related Art Conventionally, as a folding workbench of this type,
A scaffolding board, a pair of front columns and a pair of rear columns to which the upper ends of the scaffolding plates are rotatably attached, and a lower reinforcing member whose both ends are rotatably attached to the front columns and the rear columns. And a scissor plate and a front reinforcing member, both ends of which are rotatably attached to each other, and an upper reinforcing member that can be folded in two. By folding the upper reinforcing member in two, a scaffolding plate, a front supporting member, and a rear supporting member are formed. Have been proposed so that they can be folded in parallel (for example, Japanese Patent Laid-Open No. 11-36574).
(See the official gazette).

[0003]

In the foldable workbench of the above-mentioned conventional example, since the columns are formed to have a constant length,
The height of the scaffolding board was set to a constant height. for that reason,
In work places having different heights, a workbench corresponding to the height of the work position must be used, which is uneconomical. Further, even if it is assumed that the rear support column is formed to be expandable and expandable so that the expansion angle between the front support column and the rear support column is reduced and the scaffold plate position is increased,
Since the tread shape that is erected between the pair of front columns is a flat plate with a flat tread surface, if the expansion angle of the front and rear columns is reduced, the tread and tread will tilt forward and the foot of the worker standing on the tread. There was a problem that the toe pointed upwards from the heel, and the worker's body was warped and was in an unstable posture, which was extremely dangerous. Therefore, in order to solve the above-mentioned problems of the prior art, the present invention forms the rear support column and the reinforcing member so as to be extendable and contractible so that the height of the workbench can be adjusted, and the tread shape of the step rail is curved. Therefore, even if the angle of expansion of the front and rear columns is reduced and the tread tilts forward, the worker always stands around the curved contact point so that the body does not curl up and the worker safely stands on the tread. It is an object of the present invention to provide a foldable workbench that can be easily folded by contracting the reinforcing material.

[0004]

In order to achieve the above object, the invention according to claim 1 of the present invention is such that the upper ends of the left and right rear columns are pivotally attached to the left and right rear parts of the scaffold plate, and the scaffold plate is The upper ends of the left and right front struts are pivotally attached to the left and right front parts of the, and a plurality of cross rails are installed between the left and right front struts in a vertically parallel positional relationship. In a foldable workbench, which is provided with reinforcing members erected by pivoting both ends to the substantially middle position and the lower end of the rear pillar,
The stiffener and the rear strut are formed so as to be expandable and contractible, and are provided with means for stably holding a desired length, and the scaffold plate, the rear strut, and the front part are shortened by shortening the length of the stiffener. It is characterized in that it is formed to be foldable so as to be parallel to the pillar. The invention according to claim 2 is characterized in that the step rail has a tread surface shape formed into a curved surface in which a substantially central portion in the front-rear direction bulges upward. According to a third aspect of the present invention, the step rail has a flat bottom surface and a curved tread surface to form a hollow portion inside, and a rib for supporting the tread surface is provided in the hollow portion to reinforce the tread surface. It is characterized by

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. 1 is a right side view of an embodiment of a folding workbench of the present invention, FIG. 2 is a front view, FIG. 3 is a rear view, FIG. 4 is a plan view, and FIG. 6 is a vertical cross-sectional view of the cross rail, FIG. 7 is a right side view showing an operating state when folding, FIG. 8 is a cross-sectional view illustrating a means for stably holding the length of the reinforcing material, and FIG. It is the sectional view on the AA line. In these figures, the folding workbench is made of an aluminum alloy and is mainly used as a scaffolding plate 1 in a plan view.
And the left and right front struts 2 made of square pipes supporting the front edge of the scaffolding plate 1, the right and left rear struts 3 made of square pipes supporting the rear edge of the scaffolding plate 1, and the middle of the left and right front struts 2 A reinforcing member 5 extensible in a stretchable manner is provided between the position and a horizontal rod 4 provided between the lower ends of the left and right rear columns 3.

Side plates 6 are attached to opposite left and right edges of the scaffolding plate 1 at an angle of approximately 90 ° with respect to the plate surface of the scaffolding plate 1. Between the left and right front columns 2, a plurality of step bars 7 are installed so as to be in a positional relationship parallel to each other in the vertical direction. Fixed plates (not shown) are fixedly attached to the upper ends of the left and right front columns 2 from the outer surface to the back side to have a function of maintaining a constant space between the front columns 2 and at the same time. The strength of the upper end is increased. The upper end of the front support column 2 is pivotally attached to the front portion of the inner surface of the side plate 6 by a pivot 8.

As shown in FIGS. 5 and 6, the step rail 7 has a flat bottom surface 9 and rising portions 10 and 11 which are slightly tilted backward.
And a tread 12 formed by a curved surface having an arcuate cross section that bulges upward, inside the hollow body at a position of about 1/3 of the vertical width from the rising portions 10 and 11 side. The ribs 13 are formed to increase the strength.

The tarp handrail 14 is made of a pipe, and a top 141 parallel to the front support 2 and a handrail receiver 142 forming an angle of about 90 ° with the top 141 are continuously formed, and the lower end of the handrail receiver 142 is formed. Is detachably attached to the outer surface of the front column 2.

The upper end of the rear support column 3 is pivotally attached to the inner rear portion of the side plate 6 by a pivot 15, and a detachable fastener 16 such as a bolt is fastened at a position below the pivot. It is fixed integrally by wearing. Rear stanchion 3
A horizontal rod 4 is horizontally connected between the facing surfaces on the inner side of the lower end. A pair of reinforcing members 5 are provided between the horizontal rod 4 and the substantially middle positions of the left and right front columns 2. The reinforcing member 5 is formed by inserting a telescopic tube 18 in a telescopic manner into an outer tube 17 made of a square pipe whose lower end is opened. The upper end of the outer tube 17 is pivotally attached to the left and right front support columns 2. The lower end of the expandable tube 18 is pivotally attached 20 to the horizontal rod 4.

The reinforcing member 5 is provided with a means for stably holding a desired length. This means will be described with reference to FIGS. 8 and 9. 22 with a predetermined interval so that the locking rod 21 can be inserted therethrough
Are provided facing each other. A pair of perforations 23 is provided on the left and right side surfaces of the outer tube 17 at positions corresponding to the perforations 22 of the expandable tube 18. The locking rod fitting 24 is the outer tube 1
7, a pair of flat mounting portions 25 that are integrally attached by contacting with the front and rear outer surfaces, and a protruding portion outwardly from the outer edge of the mounting portions 25, and the locking rod 21 is inserted and removed inside. A pair of cover plates 27 having a possible horizontally long hollow portion 26 inside, and outer end faces 28 parallel to the left and right outer faces of the outer pipe 17 provided continuously with these cover plates 27 are formed. A locking piece 29 protruding inward is provided near the outer end of the plate 27, and the outer end surface 28 and the locking piece 29 are provided with the locking rod 2.
Insertion holes 30 and 31 through which 1 is inserted are formed on the same straight line as the perforations 23. A pair of locking pins 32 protruding laterally is provided at an intermediate position of the locking rod 21. A hole edge of an insertion hole 31 formed in the locking piece 29 is cut out outward, and the locking pin 32 is inserted through the cutout. One end of the coil spring 33 is attached to the locking pin 32, the other end is in contact with the inner side surface of the outer end surface 28, and a part of the locking rod 21 is loosely inserted in the winding shaft. When fixing the length of the reinforcing member 5, when the locking rod 21 is released from the locking piece 29 and the locking pin 32 is positioned in the hollow portion 26, the locking pin 32 is restored by the restoring force of the spiral spring 33. Is pressed against the outer surface of the outer tube 17 and the insertion state of the locking rod 21 into the perforations 22 and 23 is stably maintained. When the expansion tube 18 is slid, the locking rod 21 is pulled outward and pulled out from the perforations 22 and 23, and the locking pin 32 is passed through the notch formed in the hole edge of the insertion hole 31 to lock the locking piece 29. The telescopic tube 18 is slid to an arbitrary length while being locked to the outer surface of the.

The lower end of the rear support column 3 is open, and the expansion tube 34 is inserted inside. A caster 35 is provided at the lower end of the expansion tube 34 so as to project rearward. Telescopic tube 3
The left and right side surfaces of 4 are provided with perforations 36 at predetermined intervals along the longitudinal direction. The lower part of the rear support column 3 is provided with means for stably holding the desired length, and this means is completely different from the means for stably holding the desired length of the reinforcing member 5 shown in FIGS. 8 and 9. It has the same structure. That is, a cover plate having a hollow portion into which a locking rod 37 having a locking pin inside is inserted and removed, and an insertion hole having a notch inside through which the locking pin is inserted, in the lower portion of the rear support column 3 formed of a square pipe. A locking rod mounting bracket 38 having a locking piece formed with is attached, and the locking rod 37 is provided on the left and right side surfaces of the rear support column 3 by the restoring force of the coil spring provided on the locking rod 37. And expansion tube 34
Then, the expansion / contraction tube 34 is fixed to a desired position by allowing the expansion / contraction tube 34 to be inserted and removed.

On the scaffolding plate 1, left and right scaffolding handrails 39 and rear scaffolding handrails 40 are attached by known means so as to surround the scaffolding plate 1 from the left, right, and rear three directions.

Next, the operation will be described. 1 to 4
In addition, as shown in FIG. 6, when the folding worktable is used, the locking rod 21 is inserted into the perforations 22 and 23 to lock the telescopic tube 18 and the outer tube 17 to a desired length. In addition to fixing, the locking rod 37 is inserted into the perforations of the expansion tube 34 and the rear support column 3 to lock the expansion tube 34 and the rear support column 3 and fix them to a desired length, and further tighten the fastener 16. The rear support column 3 is fixed to the side plate 6.

When the height of the scaffolding plate 1 is changed, the locking rod 3 is used.
7 is released from the locked state, and the telescopic tube 34 is slid to set the length of the telescopic tube 34 that is exposed and extended to the outside from the lower end opening of the rear support column 3 to a desired length, and is locked again with the locking rod 37. Put in a state. Further, the locking rod 21 is released from the locked state, the expandable tube 18 is slid, the length of the reinforcing member 5 is set to a desired length, and the locking rod 21 is locked again. When the length of the rear support column 3 and the expansion tube 34 is increased, the length of the reinforcing member 5 is shortened and the expansion angle of the rear support column 3 and the front support column 2 is reduced. Although the tread 7 leans forward, the tread 12 is formed in a curved surface that curves in the front-rear direction, so that the operator always puts his / her foot on the curved contact point. Even if the expansion angle of the front and rear columns 2 and 3 becomes extremely small, the operator always puts his foot around the contact point of the curved tread 12 in a stable state, and the center of gravity of the operator does not move forward. Therefore, the body does not bend back and the worker does not fall from the step rail 7.

When folding the folding workbench,
Description will be made with reference to FIG. 7. First, the ramp handrail 14 is removed from the front support 2. Next, the fastener 16 is loosened or removed from the side plate 6 so that the rear support column 3 is rotatable about the pivot 15. The locking rod 21 is pulled out from the perforations 22 and 23, the expansion tube 18 is released from the locked state, the expansion tube 18 is housed in the outer tube 17, and the reinforcing member 5 is shortened. The both ends of the expansion tube 18 are pivoted to rotate the expansion tube 18
The rear pillar 3 when you lay it down so that it is parallel to the front pillar 2.
Is folded in parallel with the front column 2. Further, similarly to the locking rod 21, the locking rod 37 is operated to operate the rear support column 3
Then, the locked state of the expansion tube 34 is released, and the expansion tube 34 is housed in the rear column 3.

FIG. 10 shows a pair of front support columns 2 having the step rails 7 and the ramp handrails 14 provided with rearward projecting locking pieces 41 on the upper ends thereof. When this locking piece 41 is hooked on the floor edge of the entrance / exit of the ship 42 and used as a trap, the tread surface 12 of the step rail 7 is formed into a curved surface, so that the front pillar 2 is not inclined. Therefore, the user can safely ascend and descend without the body curling. Also, it can be hooked on the upper end of the fence and used as a ladder.

[0017]

According to the present invention, since the reinforcing member and the rear pillar are formed to be expandable and contractible, there is an effect that the position of the scaffold plate can be adjusted to a desired height.

Also, since the tread surface of the cross rail is formed into a curved surface that reverberates in the front-rear direction, the expansion angle between the front support post and the rear support post is reduced as the telescopic tube inserted into the rear support post expands. However, even if the slope of the front strut is large, the back of the worker's foot is placed centering on the contact point of the curved surface of the tread, so the worker's body does not warp or fall from the step rail, so it is safe. There is an effect that you can work.

Further, since the rib is provided in the hollow portion surrounded by the tread surface, the bottom surface and the rising portion, the tread surface is reinforced.

[Brief description of drawings]

FIG. 1 is a right side view of an embodiment of a folding workbench.

FIG. 2 is a front view.

FIG. 3 is a rear view.

FIG. 4 is a plan view.

FIG. 5 is a partially omitted perspective view of a step rail.

FIG. 6 is a vertical cross-sectional view of a step rail.

FIG. 7 is a right side view showing an operating state when folding.

FIG. 8 is a cross-sectional view illustrating a means for stably holding the length of the reinforcing material.

9 is a cross-sectional view taken along the line AA of FIG.

FIG. 10 is an explanatory diagram showing an operating state when used as a trap.

[Explanation of symbols]

1 scaffolding board 2 front columns 3 rear columns 4 Yokomo 5 Reinforcement material 7 crossing 9 Bottom 12 treads 13 ribs

Claims (3)

[Claims] 1. The upper ends of left and right rear columns are pivotally attached to the left and right rear portions of the scaffold plate, and the upper ends of left and right front columns are pivotally attached to the left and right front portions of the scaffold plate. A plurality of cross rails are vertically installed in parallel with each other between the sub-struts, and both ends are pivotally attached to a substantially intermediate position of the front strut and the lower end of the rear strut. In the foldable workbench provided with, the reinforcing member and the rear supporting column are formed to be expandable and contractible, and provided with means for stably holding a desired length, and by shortening the length of the reinforcing member, A foldable workbench characterized in that the scaffolding plate and the rear pillar and the front pillar are foldable so as to be parallel to each other. 2. The folding workbench according to claim 1, wherein the step rail has a tread surface formed in a curved surface in which a substantially central portion in the front-rear direction is bulged upward. 3. The step rail has a hollow portion formed inside by a flat bottom surface and a curved tread surface, and a rib for supporting the tread surface is provided in the hollow portion to reinforce the tread surface. The folding workbench according to claim 1 or 2, characterized in that.