JPH0833075B2 - Work scaffolding - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a construction site of a building or the like when performing work in a relatively high place such as finishing the interior of the ceiling, wiring in the ceiling, and piping work as shown in FIG. It's about scaffolding.

[0002]

2. Description of the Related Art In the case of building a building, interior construction and wiring work are carried out after the skeleton is constructed. In that case, in finishing work in a relatively high place such as a ceiling,
Working scaffolds are used.

As the latest conventional device for this kind of work scaffold,
There is one proposed in JP-A-3-13662.

[0004]

According to this conventional apparatus, a stage section for performing work and a foldable leg body are provided, and when used, the leg body is expanded to stand upright in the use position. At the same time, it can be folded and stored when not in use. With this structure, the scaffolding member and the scaffolding plate before that are easier to use than the separate ones, but In this proposed conventional device, it can be folded and stored compactly when not in use, but the strength of the legs during use is insufficient due to the pursuit of compactness, and therefore There was a fatal drawback of having stability.

In view of the above-mentioned problems, the present invention can be folded compactly as in the conventional case when not in use, and when in use, the legs are firmly expanded to sufficiently protect against the load and vibration received on the stage section. The purpose is to propose a work scaffold with durability.

[0006]

In order to solve the above-mentioned problems, in the invention according to claim 1, a stage part 1 for carrying out a work is provided if the reference numerals shown in the embodiments are attached and shown. The front and rear left and right legs 2a to 2d and the left and right legs 2a and 2b, which can be set to the storage position by being folded and can be set to the use position by being expanded, are attached to the stage unit 1. In 2c and 2d, the left and right horizontal rails 3 and 4 connecting the front and rear legs 2a, 2c and 2b and 2d to each other, and the front and rear horizontal rails 3 and 4 from the central portion of the stage portion 1 are displaced in the front-back direction from each other. Ri Do from the suspended and two foldable lateral reinforcing bars 5,6, the
The reinforcement bars 5 and 6 are provided when the legs 2a to 2d are expanded.
A retainer for automatically holding these legs in the use position.
A structure including a joint device 8 which also serves as a holding means 7 is adopted.

[0007]

[0008]

According to the first aspect of the present invention, the legs 2a to 2d for supporting the stage portion 1 for performing work are integrally provided with the reinforcing bars 5 and 6, and the legs 2a to 2d are stored at the storage positions. When setting to the use position from these legs 2a to 2d
Since the reinforcing bars 5, 6 extend from the folded state to the straight state in conjunction with the movement of the work scaffolding, the work scaffolding can be easily set to the use state.

Further, by expanding the legs 2a to 2d from their storage positions and erecting them in the use position, these legs 2a to 2d are firmly reinforced by the reinforcing bars 5 and 6 extending in a straight line. Therefore, it has sufficient durability against the load and vibration received on the stage unit 1.

Further, since the left and right reinforcing bars 5 and 6 for reinforcing the legs 2a to 2d are provided with their mounting positions displaced in the front-rear direction with respect to the stage portion 1 and the horizontal bars 3 and 4, the legs are provided. By folding the bodies 2a to 2d to the storage position, the left and right reinforcing bars 5 and 6 do not interfere with each other when the reinforcing bars 5 and 6 are folded in two following this, and the legs 2a to It can be folded even without interference with 2d, and can be stored as compactly as the conventional device, despite having the reinforcing bars 5 and 6.

Further, according to claim 1 , when the legs 2a to 2d are opened from their storage positions to the use positions, the joint devices 8 provided on the reinforcing bars 5 and 6 are automatically operated to automatically reinforce the reinforcing bars 5. , 6 are extended in a straight line state to maintain the straight line state, whereby the legs 2a to 2d are automatically and firmly held in their use positions. At this time, the legs 2a to 2d
It is conceivable to provide a holding means at the base between the stage and the leg as a means for holding the stage at its use position. However, if the means is provided at the base of the leg, the holding strength is weak and the stage It is difficult to prevent shaking and vibration caused by shock. On the other hand, by providing the joint device 8 which also functions as the holding means 7 on the reinforcing bars 5 and 6 as in the present invention, the position holding strength of the legs 2a to 2d is naturally strengthened and the vibration received by the stage portion 1 is naturally increased. It is possible to reliably prevent the swaying of the legs 2a to 2d against a shock or a shock.

[0012]

FIG. 1 is a front view of an embodiment of the present invention,
The stage unit 1 on which an operator rides to perform work such as the ceiling is shown in FIG.
As shown in FIG. 3, the rectangular step frame 9 made of aluminum or a metal such as expansion metal is integrally provided on the rectangular peripheral frame 10 by welding, screwing, or the like.

As shown in FIGS. 1 and 2, mounting brackets 11 having a U-shaped cross-section are provided at four corners on the back side of the stage portion 1 in the front, rear, left and right directions. Are fixed by welding or the like.

Of the front, rear, left and right mounting brackets 11, leg mounting shafts 12 are mounted between the front and rear mounting brackets 11, 11 respectively.
Before and after each of the legs 2 (2a, 2c and 2b, 2
d) is attached. Each leg 2 is attached to the leg mounting shaft 12 so as to be rotatable between an upright state facing the opening 11b opening downward of the mounting bracket 11 and a stored state facing the opening 11a opening laterally. . Thus, in order to rotatably mount each leg 2 to the mounting bracket 11 from its upright state to the stored state, the base 13 of each leg 2 is rotatably connected to the leg mounting shaft 12, or each leg 2 is rotatably connected. The two base portions 13 are integrally attached to the leg mounting shaft 12, and the leg mounting shaft 12 is rotatably attached to the mounting bracket 11.

As shown in FIGS. 1 and 3, each leg 2 has a first leg member 14 whose base portion 13 is attached to the leg attachment shaft 12, and is fitted to the first leg member 14 with a smaller diameter. The second leg member 15 and the leg length adjusting device 1 as described later.
The second leg member 15 can be expanded and contracted with respect to the first leg member 14 by means of 6. In the left and right second leg members 15, 15, each leg member 1
The crosspieces 5 and 15 are also appropriately connected by the horizontal rail 54.

As shown in FIG. 1, particularly in FIG. 3, the left and right legs 2 are provided.
a to 2d, front and rear legs 2a, 2c and 2b, 2
The horizontal rails 3 and 4 are attached between the lower ends of the first leg members 14 of FIG.
The reinforcements 4 and 14 are made in the front-rear direction.

As shown in FIGS. 1 to 3, on the rear surface side of the central portion of the step board 9 of the stage portion 1, at a position shifted to the front and back, as shown by the alternate long and short dash line in FIG. Mounting brackets 17 and 18 having U-shaped cross-sections in which the openings 17a and 18a face in the opposite directions to the left and right are fixedly attached, and the mounting brackets 19 and 20 are mounted to the mounting brackets 1.
Reinforcing bars 5 and 6 are provided between 9, 20 and the left and right horizontal bars 3 and 4.
Are pivotally connected. The reinforcing bars 5 and 6 are rotatably mounted between the above two members.
Even if both ends of the reinforcing bar 5 and 6 are rotatably connected between the bar mounting shafts 19 and 20 and the horizontal bars 3 and 4, both ends of the reinforcing bars 5 and 6 are rotatably provided. 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, as shown in FIG.
The joint device 8 for folding the reinforcing bars 5 and 6 in two is provided as shown in FIG. 1, and the reinforcing bars 5 and 6 are folded in two around the joint device 8 as shown by the chain double-dashed line. In conjunction with this, the legs 2a to 2d can be housed on the back side of the stage unit 1.

As shown in FIG. 5, the joint device 8 has a cylindrical upper side lock main body 21 and a lower side lock main body 22, and the upper side rail member 23 and the lower side rail of the reinforcing rails 5 and 6, respectively. The lock bodies 21 and 22 are fixed to the member 24 by welding or the like, and the lock main bodies 21 and 22 are pivotally connected to each other by a joint shaft 25. The member 23 can be folded in two in the direction of arrow A in the figure. A lock block 27 rotatably supported on the lower lock body 22 by a lock shaft 26 is provided over the upper and lower lock bodies 21 and 22.

A lock piece 28 is provided at the tip of the lock block 27 so as to project, and the lock piece 28 engages with an engaging projection 29 provided on the lock body 21 on the upper side. Further, the lock block 27 is provided with a hollow portion 30, in which a lock spring 31 made of a compression spring is housed, one end of which is received by the joint shaft 25, and the other end of which is received by the inner wall of the hollow portion 30, The lock surface 28a of the lock piece 28 is urged by the lock spring 31 to strongly press and engage with the engagement surface 29a of the engagement protrusion 29 of the upper lock body 21.

A release lever 32 for releasing the locked state of the lock block 27 is provided at the rear end of the lock block 27, and the outer peripheral surface of the tip end of the lock block 27 has an upper portion as described later. When the lower side rail member 24 is extended from the half-folded state with respect to the side rail member 23, the lock block 27 causes the corner portion 29 b of the engaging projection 29 to be extended.
A guide surface 27a for sliding along (FIG. 6) is formed.

In the state shown in FIG. 5, the lock piece 28 of the lock block 27 pivotally attached to the lock shaft 26 of the lower lock body 22 is applied to the engaging projection 29 of the upper lock body 21 by the urging force of the lock spring 31. It shows a state in which the upper rail member 23 and the lower rail member 24 are linearly locked by being strongly pressed and engaged. From this locked state, as shown in FIG. 6, in order to perform an opening operation in which the lower side rail member 24 is folded in half with respect to the upper side rail member 23, the release lever 32 is moved in the direction of arrow B.
As described above, the lock spring 31 may be rotated downward against the biasing force of the lock spring 31. By this operation, the lock piece 28 is separated from the engagement projection 29 and the engagement state between them is released, and in this state, the lower crosspiece member 24 is pivoted upward about the joint shaft 25 as shown by arrow A. By doing so, the lower crosspiece member 24 can be folded in two so as to be folded and overlapped with the upper crosspiece member 23 as shown in FIG.

In order to extend the lower crosspiece member 24 to the straight line state again from the folded state, the lower crosspiece member 24 is pivoted downward about the joint shaft 25 so that the lock block 27 moves. The guide surface 27a is the upper cross member 2
3 is brought into contact with a corner portion 29b of the engaging projection 29 of No. 3, and the lock block 27 is pushed by the engaging projection 29 to lock the lock spring 3
It slightly sinks into the joint shaft 25 side against the urging force of 1. The guide surface 27a slides on the corner portion 29b of the engaging projection 29 by rotating the lower crosspiece member 24 even more strongly, and the lock block 27 slides on the corner portion 29b. Since it is released from the pressing force of 29, the lock spring 31 is urged from the retracted state to project, and the lock piece 28 of the lock block 27 engages with the engaging projection 29, so that It will maintain a strong straight line.

In this manner, the joint device 8 locks both the reinforcing bars 5 and 6 in a straight line state, and while maintaining this state, the leg bodies 2 reinforced by the both reinforcing bars 5 and 6 are in an upright state,
That is, since the use state is held, the joint device 8 also serves as the use position holding means 7.

FIG. 7 shows the details of the leg length adjusting device 16 described above. A part of the peripheral wall of the second leg member 15 fitted to the first leg member 14 of each leg 2 is elongated. A member 35 having a pin receiving stepped portion 33 and a flat portion 34 alternately arranged at appropriate intervals in the longitudinal direction of the recessed portion 15a by a screw 36 or the like.
The pin receiving step portion 33 forms a horizontal step surface 33a on the upper surface side thereof, while the lower surface side thereof forms a tapered surface 33b.
Is formed. A mounting bracket 37 is projectingly fixed so as to surround the outer peripheral surface of the first leg member 14, and an adjusting pin 38 on the lower side and an anti-rattle pin 39 on the upper side are attached to the mounting bracket 37. The adjusting pin 38 is provided corresponding to the member 35 having the pin receiving stepped portion 33 penetrating the side wall of the leg member 14, and the adjusting pin 38 is provided between the mounting bracket 37 and the spring receiver 40.
Is urged toward the pin receiving stepped portion 33 side by the arrow a, and an open position maintaining small piece 42 is projectingly provided on the adjusting pin 38 at a right angle to the adjusting pin 38. Hold the arrow b against the biasing force of the compression spring 41.
Retreat and open as shown by and 90 as shown by arrow c
By rotating the small piece 42, the small piece 42 is engaged with the small piece engaging portion 44 provided on the mounting bracket 37 so that the adjusting pin 38 can be maintained at the open position.

Further, the rattling prevention pin 39 is provided with bolt portions 45 and 46 on the base end side and the tip end side thereof, and the base end side bolt portion 45 is provided on the mounting bracket 37. Screw into the pin receiving step portion 33,
It is adapted to be pressed against the flat portion 34 between 33, and by removing the base end side bolt portion 45 from the female screw portion 47, the outer peripheral surface of the mounting bracket 37 and the knob 48 of the rattling prevention pin 39 are provided. The rattling prevention pin 39 can be maintained in an open state by being biased by a compression spring 49 provided in between.

Therefore, when operating the leg length adjusting device 16, the open position maintaining small piece 42 is engaged with the small piece engaging portion 44 to maintain the adjusting pin 38 in the open state from the pin receiving step portion 33 as described above. At the same time, the rattling prevention pin 39 is also maintained in the open state, and by this operation, the second leg member 1
Since 5 can be freely expanded and contracted with respect to the first leg member 14, the second leg member 15 is moved to a required expansion and contraction position with respect to the first leg member 14, and the adjustment pin 38 is further indicated by an arrow at that required position. As shown by c, it is rotated by 90 °, and the open position maintaining small piece 42 protruding therefrom is released from the small piece engaging portion 44. As a result, the adjusting pin 38 is biased by the compression spring 41 and engages with the pin receiving stepped portion 33, and the load received by the first leg member 14 is received by the adjusting pin 38 and the pin receiving stepped portion 33 with which it is engaged. The contraction movement of the second leg member 15 can be prevented. In this case, the second leg member 15 should be attached to the first
When the extension member is moved downward with respect to the leg member 14, it is not necessary to maintain the adjustment pin 38 in the open position, and by simply extending the second leg member 15 downward,
The adjusting pin 38 is the tapered surface 3 of the pin receiving step portion 33.
3b and adjust pin 3 along the tapered surface 33b.
8 moves backwards against the urging force of the compression spring 41 and moves over the tapered surface 33b, so that the adjusting pin 38 is automatically urged by the compression spring 41 and engages with the step surface 33a of the pin receiving step portion 33. Can be made.

In order to prevent rattling between the first leg member 14 and the second leg member 15, a rattling prevention pin 3 is provided.
9, the base end side bolt portion 45 is screwed into the female screw portion 47 against the biasing force of the compression spring 49, and the tip portion of the prevention pin 39 is strongly pressed against the flat portion 34 between the pin receiving step portions 33, 33. The rattling prevention pin 39 prevents the rattling between the two leg members 14 and 15 due to the tensioning action of the rattling prevention pin 39.

By the above operation, the leg length of each leg 2 can be adjusted in a stretchable manner.

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, the stage unit 1
An auxiliary wheel 51 is provided so as to be retractable at one end edge in the front-rear direction. The retracting mechanism of the auxiliary wheel 51 has substantially the same structure as the leg length adjusting device 16 shown in FIG.
Using the hollow part of the auxiliary wheel 51, the retractable shaft pivotally supporting the auxiliary wheel 51 is fitted to the leg mounting shaft 12, and the auxiliary wheel is supported by the retractable adjusting pin 52 and the rattling prevention pin 53 as shown in FIG. 51
Between the retracted position and the projecting position is projected and retracted, and at the retracted position, the pins 52 and 53 are engaged. When the legs 2 are stored, the stage 1 can be turned sideways and can be carried by the auxiliary wheels 51 protruding from the stage 1.

However, when using as shown in FIG.
As shown in FIG. 1, the legs 2a to 2d are rotated about the leg mounting shaft 12 in an upright state, and at the same time, the reinforcing bars 5 and 6 are extended from the state of being folded in half by the joint device 8 to be in a straight state. To do. By extending the reinforcing bars 5 and 6 in a straight line in this way, the holding means 7 also serving as the joint device 8 provided on the reinforcing bars 5 and 6 strongly maintains the reinforcing bars 5 and 6 in a straight line state. As a result, the legs 2a to 2d connected to the reinforcing bars 5 and 6 can be firmly maintained in the used state. In this way, the reinforcing bars 5 and 6 for reinforcing the legs 2a to 2d
By providing the holding means 7 in the above, it is possible to prevent the leg bodies 2a to 2d from swaying particularly in the left-right direction and to strongly maintain the upright state.

After all, according to the present invention, the horizontal crosspieces 3 and 4 and the left and right reinforcing crosspieces 5 and 6 provided on the legs 2a, 2c and 2b and 2d prevent the swaying in the front and rear and left and right, It has a strong durability against the load and vibration of the worker riding on the part 1.

When the legs 2a to 2d are stored in the back side of the stage 1 from the usage state of the legs 2a to 2d, the opening lever 32 of the holding means 7 is operated to operate the holding means 7. The holding action is released, and the reinforcing bars 5 and 6 are folded and folded around the joint device 8 so that the left and right legs 2a, 2c and 2b, 2 interlock with this.
d is folded and stored on the back surface side of the stage unit 1.

FIG. 4 shows this storage state. The legs 2 and the reinforcing bars 5 and 6 are compact within the height range of the mounting bracket 11 projecting on the back side of the stage 1. Since the casters 50 at the tips of the legs 2 are also stored sideways, the casters 50 do not protrude from the height position of the mounting bracket 11.

However, as shown in FIG. 4, each member of the work scaffold can be compactly stored on the back side of the stage portion 1, so that it does not become bulky during transportation and storage.

[0037]

According to the first aspect of the present invention, reinforcing bars are integrally provided on the front, rear, left and right legs that support the stage portion for performing work, and each leg is moved from its storage position to its use position. When setting, the reinforcing bar automatically extends from the folded state to the straight state in association with the movement of each leg, so that the work scaffold can be easily set to the used state.

By expanding each leg from its storage position and erecting it in the use position, these legs are
Since the reinforcing bars and the horizontal bars that extend in a straight line block the left and right and front and rear sway, and are reinforced firmly, they have sufficient durability against the load and vibration received on the stage part.

Further, since the left and right reinforcing bars for reinforcing each leg are provided by shifting the mounting positions in the front-rear direction with respect to the stage portion and the left and right horizontal bars, each leg follows the storing operation. Then, when the left and right reinforcing bars are folded in two, the left and right reinforcing bars can be folded without interfering with each other and with each leg body. Nevertheless, it can be stored compactly as in the conventional device.

Further, according to the first aspect of the invention, by expanding each leg from the storage position to the use position, the joint device provided on the reinforcing bar automatically operates to bring the reinforcing bar into a straight state. Extend and maintain its straightness, which automatically holds the leg firmly in its position of use. At this time, it is conceivable to provide a holding means at the base between the stage and the leg as a means for holding each leg at its use position. However, if the means is provided at the base of the leg, Since the holding strength is weak, it is difficult to prevent shaking caused by vibrations and impacts on the stage.

On the other hand, as in the present invention, by providing the reinforcing bar with the joint device which also serves as the holding means, the position holding strength of each leg is naturally strengthened, and each leg is against the vibration received by the stage part. It can reliably prevent body sway, and has sufficient durability against external loads and vibration impacts.

[Brief description of drawings]

FIG. 1 shows a front view of an embodiment of the present invention.

FIG. 2 is a plan view of the same and shows a part of the inside by being cut away.

FIG. 3 is a side view of the same.

FIG. 4 is a vertical sectional front view showing a housed state of each member.

FIG. 5 is a vertical sectional front view of the main part.

FIG. 6 is a vertical cross-sectional front view showing an operating state of the main part.

FIG. 7 is a vertical sectional front view showing another main part.

FIG. 8 is an explanatory diagram showing the same usage state.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Stage part 2 (2a-2d) Leg body 3 Horizontal rail 4 Horizontal rail 5 Reinforcing rail 6 Reinforcing rail 7 Holding means 8 Joint device

Front Page Continuation (72) Inventor Yuji Fujimoto 1-1-1, Mishimae, Takatsuki-shi, Osaka Within Alinco Co., Ltd. (56) References JP 62-68964 (JP, A) Actual 62-176337 (JP, U) Actual Kaihei 1-154743 (JP, U)

Claims (1)

[Claims] 1. A stage section for performing work, front and rear left and right legs that can be set to a storage position by being folded and can be set to a use position by being expanded. The left and right legs consist of left and right horizontal rails that connect the front and rear legs to each other, and left and right reinforcing rails that are suspended from each other in the front-rear direction from the central portion of the stage section and are foldable in two.
The reinforcement bars automatically when the legs are expanded.
Also serves as holding means for holding the leg in the use position.
A work scaffolding equipped with a bed joint device .