JP2966763B2 - Workbench telescopic legs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telescopic leg of a work table used when working at relatively high places such as interior finishing of a ceiling, wiring in a ceiling, and piping work at a construction site of a building.

[0002]

2. Description of the Related Art In building a building, interior finishing, wiring work, and the like are performed after a skeleton is constructed. In this case, a work table is used for finishing work in a relatively high place such as a ceiling.

[0003] As a conventional apparatus of this kind of worktable, there is one proposed in Japanese Patent Application Laid-Open No. Hei 3-13662.

[0004] It is provided with a stage portion for performing work and a leg that can be folded against the stage, and when used, the leg is expanded to stand upright in a use position, and when not in use, it is folded and stored. You can do it. There is also known a worktable in which legs can be expanded and contracted in accordance with the work height. According to such a structure, the former scaffold member and the scaffold plate are more convenient to use than a separate scaffold member.

[0005]

However, in the conventional worktable, when the working height is high during use, the leg can be extended, and when not in use, the leg is contracted and folded. Can be accommodated in a compact way,
There has been a fatal disadvantage that the rigidity of the expansion and contraction adjusting portion of the leg during use is insufficient due to excessive pursuit of its compactness, and therefore, it has instability.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to propose a worktable telescopic leg capable of providing a stable worktable without rattling at a leg expansion and contraction adjusting part. .

[0007]

In order to achieve the above-mentioned object, according to the present invention, if the present invention is provided with the reference numerals in the drawings, the first invention will be described in detail. A leg body comprising a leg member and a second leg member which is telescopically fitted to the leg member; and an engaging portion in a direction in which the second leg member extends and contracts at an appropriate distance from the second leg member. , 43
And the pressed surfaces 24 and 45 are provided adjacent to each other, and the first leg member 1
In the vicinity of the lower end of 4, an adjustment pin 30 which can be engaged with the engagement portions 23 and 43 and is formed with a pressing screw portion 41, and a position where the adjustment pin 30 is engaged with the engagement portions 23 and 43, and disengagement And a bracket 31 having a female screw portion 35 for pressing the pressed surfaces 24 and 45 with the adjustment pin 30 by screwing the pressing screw portion 41 and movably supporting the leg length adjusting device 16. This configuration is adopted.

According to a second aspect of the present invention, there is provided a means for urging the adjusting pin toward the engaging position, and the engaging portion is provided with a step surface facing the contraction direction of the second leg member. The structure according to claim 1 is formed in a triangular shape having an inclined surface extending obliquely in the direction of extension from a tip end of the device.

According to a third aspect of the present invention, there are provided means 40 for urging the adjustment pin 30 toward the engagement position, and means 37 for locking the adjustment pin 30 at the disengagement position. Or, the configuration described in 2 is adopted.

[0010]

According to the first aspect of the present invention, the first leg member is provided.
The length of the leg 2 is arbitrarily adjusted by expanding and contracting the second leg member 15 with respect to the position, and the adjusting pin 30 supported by the bracket 31 is moved to the engaging position to engage the engaging portions 23 and 43. The length of the leg 2 can be arbitrarily set by engaging with the second leg member 15 by rotating the adjustment pin 30 and screwing the pressing screw portion 41 into the female screw portion 35 in this state. By pressing the pressed surfaces 24 and 45 to strongly press the second leg member 15 against the inner wall surface of the first leg member 14, the play between the first leg member 14 and the second leg member 15 is ensured. Can be prevented.

According to a second aspect of the present invention, the adjusting pin 30
Is biased toward the engagement position, and the engagement portion 23 is moved to the second leg member 1.
5 is formed in a triangular shape having an inclined surface 28 in the extension direction, so that when the leg length is adjusted, simply by extending the second leg member 15, the adjustment pin 30 automatically causes the stepped surface 27 of each engagement portion 23.
, The leg length can be easily adjusted.

According to a third aspect of the present invention, the adjusting pin 30
The second leg member 15 can be arbitrarily extended or contracted by locking the second leg member 15 to the disengagement position by the locking means 37, and when the locking is released after the approximate position adjustment, the adjustment pin 30 is automatically brought into the vicinity. , The leg 2 can be easily expanded and contracted.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a work table to which a telescopic leg of a work table according to the present invention is applied.

In FIG. 1 to FIG. 3, reference numeral 1 denotes a stage section on which a worker rides and works on a ceiling or the like. A step board 9 made of a metal such as an aluminum plate or an expansion metal is stretched on a rectangular peripheral frame 10. , And are integrally fixed by welding, riveting, or the like.

At four corners on the lower surface side of front and rear and left and right of the stage portion 1, a mounting bracket 11 having a U-shaped cross section and an opening 11a facing inward in the left and right facing direction and having an opening 11b below is welded. And so on.

Of the front and rear left and right mounting brackets 11, the leg mounting shaft 1 is located between the front and rear mounting brackets 11 and 11, respectively.
The legs 2 (2a, 2c and 2b, 2d) are mounted before and after each of the left and right leg mounting shafts 12. Each leg 2 is rotatably attached to the leg mounting shaft 12 between an upright state facing an opening 11b opening below the mounting bracket 11 and a storage state facing an opening 11a opening laterally. . As described above, in order to rotatably mount each leg 2 from the upright state to the stowed state on the mounting bracket 11, the base 13 of each leg 2 is rotatably connected to the leg mounting shaft 12, or each leg 2 is rotatably connected. The base 13 is integrally mounted on the leg mounting shaft 12, and the leg mounting shaft 12 is rotatably mounted on the mounting bracket 11.

Each leg 2 has a base 13 having a leg mounting shaft 12.
A first leg member 14 having a substantially rectangular cylindrical shape attached to the
A second leg member 15 fitted to the leg member 14. The second leg member 15 can be extended and contracted with respect to the first leg member 14 by a leg length adjusting device 16 as described later. . In the left and right legs 2a to 2d, the horizontal rails 3 and 4 are attached between the lower ends of the first leg members 14 and 14 of the front and rear legs 2a and 2c and 2b and 2d, respectively. The members 14 are reinforced in the front-rear direction. Also, the left and right second leg members 15 and 15 are connected to each other by the horizontal rail 54 as appropriate.

On the back side of the center of the tread plate 9 of the stage section 1, cross-sections in which U-shaped openings 17a and 18a are opposite to each other at right and left positions as shown in FIG. The mounting brackets 17 and 18 in the shape of a letter are fixed,
The beam mounting shafts 19 and 20 are attached to this, and the reinforcing beams 5 and 6 are pivotally connected between the respective beam mounting shafts 19 and 20 and the left and right horizontal beams 3 and 4. The reinforcing bars 5 and 6 are rotatably mounted between the two. However, as a structure thereof, both ends of the reinforcing bars 5 and 6 may be rotatably connected to the bar mounting shafts 19 and 20 and the horizontal bars 3 and 4, respectively. Good or reinforcement bar 5,
6 are attached to the rotatable beam mounting shafts 19, 2
0 and the horizontal rails 3 and 4 may be integrally connected.

In the middle of the reinforcing bars 5 and 6 in the longitudinal direction, FIG.
As shown in the figure, a joint device 8 for folding the reinforcing bars 5 and 6 into two is provided. By folding the reinforcing bars 5 and 6 around the joint device 8 as shown by a two-dot chain line, In conjunction with this, the legs 2a to 2d as shown in FIG.
Can be stored on the back side of the stage section 1.

FIGS. 5 to 8 show details of the leg length adjusting device 16. The first leg member 14 of each leg 2 is formed of a rectangular tubular member having a substantially rectangular cross section, and reinforcing projections 21 having an arc-shaped cross section are formed on both outer surfaces of one of the side walls 14a facing each other in the front-rear direction.
And a reinforcing ridge 22 having an arc-shaped cross section is also formed at the center of the inner surface of the other side wall 14b. This first leg member 14
The second leg member 15 to be fitted into the second leg member 15 has a substantially rectangular overall cross-section, and has recesses 15a and 15b formed in a central portion of side walls opposed in the front-rear direction and having a U-shaped cross section in the longitudinal direction. Are formed along the bottom surface of one recessed portion 15a facing one side wall 14a of the first leg member 14, and a plurality of engaging members 25 in which an engaging portion 23 and a pressed surface 24 are formed adjacent to each other. Are integrally attached with rivets 26 at appropriate intervals. The engaging portion 23 has a horizontal step surface 27 on the upper surface side, while the inclined surface 28 is formed on the lower surface side. In addition, as shown in FIG.
5a, a downward step surface 27a is formed at an interval facing the upward step surface 27 so that the adjustment pin 30 can be fitted therein. When the adjustment pin 30 is not operated, the second leg member 15 is further lowered downward. It is configured not to be able to extend and move.

At a position near the lower end of the first leg member 14,
A bracket 31 is mounted on one side wall 14a with both side edges engaged with the reinforcing ridges 21, 21. Bracket 3
Reference numeral 1 denotes a substantially trapezoidal frame having attachment pieces 32 extending to both sides, and both attachment pieces 32 are fixed to one side wall 14 a by rivets 33. A female screw member 35 is provided on the ceiling wall 34 of the bracket 31.
Is penetrated and fixed to the ceiling wall 34 at the flange portion 35a. At the intermediate position between the ceiling wall 34 and the bottom wall 36 of the bracket 31, a locking tongue piece 37 extends inward from both sides so as to form an appropriate gap between the tips.

The adjusting pin 30 penetrates the female screw member 35, and furthermore, the bottom wall 36 of the bracket 31 and the first leg member 1
4 penetrates a through hole 38 formed in one side wall 14a, so that the tip portion 30a is movably supported between a position where it engages with the engaging portion 23 and a position where it disengages. I have. A split pin 39 is penetrated at an appropriate distance from the tip of the adjustment pin 30. A compression coil spring 40 is interposed between the split pin 39 and the flange 35a of the female screw member 35, and is configured to urge the adjustment pin 30 toward the engagement position. Also, split pin 3
The length of 9 is set longer than the interval between the locking tongues 37, 37, and the adjusting pin 30 can be locked at the disengaged position by engaging the split pin 39 with the locking tongues 37, 37. It is configured as follows.

At the end of the adjustment pin 30 opposite to the tip 30a, a pressing screw 4 which can be screwed into the female screw member 35 is provided.
1 is formed, and a knob 42 is fixed to the other end. As shown in FIG. 8C, the pressing screw portion 41
In a state where the adjustment pin 30 is projected to the engagement position by the urging force of the compression coil spring 40, the knob 41 is screwed into the female screw member 35 by rotating the knob 41, and as shown in FIG. The formation position is set so as to press the pressed surface 24.

In the above configuration, when operating the leg length adjusting device 16, as shown in FIG.
2 is pulled against the urging force of the compression coil spring 40 to engage the split pin 39 of the adjustment pin 30 with the locking tongue 37,
By locking the adjustment pin 30 at the engagement / disengagement position, the second leg member 15 can freely move in and out of the first leg member 14. In this state, the second leg member 15 is moved to a required telescopic position with respect to the first leg member 14, and the knob 42 is rotated by 90 degrees at the required position to engage the split pin 39 with the locking tongue piece 37. Is released, the adjustment pin 3
0 is urged by the compression coil spring 40 toward the engagement position where it engages with the engagement portion 23, and the adjustment pin 30 engages with the engagement portion 23 as shown in FIG. Then, the load received by the first leg member 14 from the stage portion 1 is received by the adjusting pin 30 and the engaging portion 23 with which the adjusting pin 30 engages.
5 is blocked.

In this embodiment, the engaging portion 23 is provided on the stepped surface 2.
Since it is formed in a triangular shape having 7 and an inclined surface 28,
When the second leg member 15 is extended downwardly with respect to the first leg member 14, the adjustment pin 30 slides on the inclined surface 28 as shown in FIGS. 8B and 8C. As a result, when the adjustment pin 30 moves backward against the urging force of the compression coil spring 40 and gets over the inclined surface 28, the adjustment pin 30
Is automatically urged by the compression coil spring 40 to protrude to the engagement position, and can be engaged with the step surface 27 of the engagement portion 23.

Then, from the state shown in FIG.
By rotating the knob 42 at 0 and screwing the pressing screw portion 41 into the female screw member 35 of the bracket 31,
As shown in FIGS. 6 and 7, the adjustment pin 30 presses the pressed surface 24 of the second leg member 15 to strongly press the second leg member 15 against the inner wall surface of the first leg member 14. The rattling between the first leg member 14 and the second leg member 15 is reliably prevented. With the above operation, the leg length of each leg 2 can be adjusted to be freely extendable.

In FIG. 1, casters 50 with stoppers are attached to the lower ends of the second leg members 15 of the legs 2a to 2d. 2 and 3, an auxiliary wheel 51 is provided at one end of the stage 1 in the front-rear direction so as to be able to protrude and retract. The retracting mechanism of the auxiliary wheel 51 has substantially the same structure as the leg length adjusting device 16 shown in FIG.
A retractable shaft that pivotally supports 1 is fitted, and the adjusting pin 52 is used to protrude and retract between the retracted position and the protruded position of the auxiliary wheel 51, and is locked at the retracted position. When the legs 2 are stored, the stage 1 is turned sideways and can be transported by the auxiliary wheels 51 protruding from the stage.

As shown in FIG. 10, when performing work in high places such as interior finishing of the ceiling, wiring in the ceiling, and piping work, the legs 2a to 2d are attached to the legs as shown in FIG. At the same time, the reinforcing bars 5 and 6 are extended from the state of being folded in two by the joint device 8 to be in a straight line state while being rotated upright about the shaft 12. By extending the reinforcing bars 5 and 6 in a straight line as described above, the legs 2a to 2d connected to the reinforcing bars 5 and 6 can be firmly maintained in the use state. In addition, by operating the leg length adjusting device 16 as described above, the leg length of each leg 2 can be adjusted so as to be able to expand and contract, and rattling between the two leg members 14 and 15 can be completely prevented. it can. Thus,
The cross bars 3 and 4 in the front and rear direction and the reinforcing bars 5 and 6 provided on the legs 2a, 2c and 2b and 2d prevent the front and rear and left and right sides, and the leg length adjusting device 16 expands and contracts the legs 2a to 2d. Since the backlash can be prevented while adjusting, it has strong durability against the load and vibration of the worker or the like who is on the stage section 1.

Then, from the state of use of the legs 2a to 2d,
When these legs 2a to 2d are stored on the back side of the stage 1, the reinforcing bars 5 and 6 are folded in two around the joint device 8, and the left and right legs are interlocked with this. 2a, 2c and 2b, 2d are folded and stored on the back side of the stage 1.

FIG. 4 shows this stored state, in which each leg 2 and the reinforcing bars 5 and 6 are compact within the range of the height of the mounting bracket 11 protruding from the back side of the stage 1. And the casters 50 at the distal ends of the legs 2 are also stored sideways so that they do not protrude from the height position of the mounting bracket 11. In this way, since each member of the worktable can be compactly stored on the back surface side of the stage unit 1, there is no bulk in transportation and storage.

In the above embodiment, the second leg member 15 has the stepped surface 2
Although an example is shown in which a triangular engaging portion 23 having an inclined surface 7 and an engaging member 25 having a pressed surface 24 are attached,
The present invention is not limited to such a structure of the engagement portion. For example, as shown in FIG. 9, an elongated hole having an engagement hole 43 in which the adjustment pin 30 can be fitted and engaged at an appropriate interval in the longitudinal direction is formed. A plate-shaped engaging member 44 is attached to the second leg member 15,
The pressed surface 45 with which the tip of the adjustment pin 30 penetrating the engagement hole 43 abuts may be formed on the second leg member 15 itself.

In FIG. 9, a wide space portion 46 is formed on the opening side of the depression 15a of the second leg member 15 facing one side wall 14a of the first leg member 14, so that the pressed surface 45 is formed.
A support surface 47 is formed between the support member 47 and the rear portion, and engagement grooves 48 are formed on both sides thereof. The engagement member 44 is disposed on the support surface 47 and both side edges thereof are formed with the engagement grooves. 4
8 is engaged. The engaging member 44 is inserted through the lower end of the second leg member 15, and an L-shaped bent attachment portion 44 a is formed at the lower end of the engaging member 44.
Are fixed to the lower end of the second leg member 15 with screws 50 together with the leg member 49 fitted to the lower end of the second leg member 15.

In the above embodiment, an example of the worktable in which the legs 2a to 2d can be folded on the back side of the stage 1 has been described. However, in the present invention, the legs 2a to 2d are
, And can be applied to a workbench in which only the expansion and contraction adjustment of each of the legs 2a to 2d is performed.

[0034]

According to the first aspect of the present invention, the length of the leg is arbitrarily adjusted by extending and retracting the second leg with respect to the first leg, and the adjustment supported by the bracket. The length of the leg can be set arbitrarily by moving the pin to the engaging position and engaging the engaging portion.In this state, the adjusting pin is rotated and the pressing screw portion is screwed into the female screw portion, and the adjusting pin is To press the pressed surface of the second leg member to move the second leg member to the first position.
By strongly pressing against the inner wall surface of the leg member, it is possible to reliably prevent rattling between the first leg member and the second leg member, so that the telescopic operation is easy and the rattling at the telescopic portion is achieved. In addition, since the adjusting pin is used for both the engaging means for the engaging portion and the pressing and fixing means, the number of components is small, and a simple configuration and an inexpensive telescopic leg can be provided.

According to the second aspect, the adjusting pin is urged toward the engaging position, and the engaging portion is formed in a triangular shape having an inclined surface in the extending direction of the second leg member. By simply extending the second leg member at the time of adjustment, the adjustment pin automatically and sequentially engages with the step surface of each engagement portion, so that leg length adjustment can be easily performed.

According to the third aspect, when the adjusting pin is locked in the disengaged position by the locking means, the second leg member can be arbitrarily extended or contracted, and after the position is substantially adjusted, the locking is performed. When released, the adjusting pin automatically engages with a nearby engaging portion, so that the leg can be easily expanded and contracted.

[Brief description of the drawings]

FIG. 1 is a front view of a worktable according to an embodiment of the present invention.

FIG. 2 is a plan view showing a part of the embodiment in a cutaway manner.

FIG. 3 is a side view of the embodiment.

FIG. 4 is a vertical sectional front view showing a stored state of the work table in the embodiment.

FIG. 5 is a side view of a leg length adjusting device in the embodiment.

FIG. 6 is a partial sectional side view of the leg length adjusting device in the embodiment.

FIG. 7 is a sectional view taken along the line AA of FIG. 6;

FIG. 8 is an explanatory diagram of an operation of the leg length adjusting device in the embodiment.

9A and 9B show another embodiment of the leg length adjusting device, in which FIG. 9A is a cross-sectional plan view, and FIG. 9B is a partially longitudinal side view.

FIG. 10 is a perspective view showing a use state of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stage part 2 (2a-2d) Leg 14 First leg member 15 Second leg member 16 Leg length adjusting device 23 Engaging part 24 Pressed surface 27 Step surface 28 Inclined surface 30 Adjusting pin 31 Bracket 35 Female screw member 37 Engagement Tongue piece 40 Compression coil spring 41 Pressing screw part 43 Engagement hole 45 Pressed surface

Claims (3)

(57) [Claims] 1. A leg comprising a first leg attached to a stage and a second leg extended and contracted to the first leg, and the second leg is disposed at an appropriate distance from the second leg. The engaging portion and the pressed surface in the direction of expansion and contraction of the
An adjusting pin, which is engageable with the engaging portion and has a pressing screw portion, near the lower end of the leg member, and is movable between a position at which the adjusting pin is engaged with the engaging portion and a position at which the adjusting pin is disengaged. An extendable leg for a worktable, comprising a leg length adjusting device including a bracket having a female screw portion for supporting and pressing a pressed surface with an adjusting pin by screwing a pressing screw portion. Means for urging the adjusting pin toward the engaging position, wherein the engaging portion has a step surface facing the contraction direction of the second leg member and an inclined surface extending obliquely in the extension direction from the tip of the step surface. The telescopic leg of the worktable according to claim 1, wherein the leg is formed in a triangular shape having the following. 3. The work table according to claim 1, further comprising means for urging the adjustment pin toward the engagement position, and means for locking the adjustment pin at the disengagement position. Telescopic legs.