JPH0719484U - Work scaffolding - Google Patents

Abstract

(57) [Abstract] [Purpose] By expanding each leg that supports the stage part, the joint device provided on the reinforcing bar automatically operates so that each leg firmly stands upright in its use position. . [Structure] An upper crosspiece member 23 forming foldable leg reinforcement bars 5 and 6 connected to left and right legs 2a to 2d foldably provided on the back surface side of a stage section 1 for performing work, When the legs 2a to 2d are expanded between the lower cross member 24 and the upper cross member 23, which are pivotably attached to the upper cross member 23, the legs 2a to 2d are automatically expanded. It is provided with a joint device 8 which also serves as a holding means 7 for holding.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a work scaffold for use at a relatively high place such as interior finishing of the ceiling, wiring in the ceiling, and piping work at a construction site of a building as shown in FIG.

[0002]

[Prior art]

 When constructing a building, the interior finishing and wiring work are performed after constructing the skeleton. In this case, work scaffolding is used for finishing work in a relatively high place such as the ceiling.

As the latest conventional device for this type of work scaffold, there is one proposed in Japanese Patent Laid-Open No. 13662/1993.

[0004]

[Problems to be solved by the device]

 According to this conventional device, a stage portion for performing work and a leg body that can be folded are provided for the stage portion, and when used, the leg body is opened to stand upright in the use position, and when not used, it is folded and stored. This structure makes it easier to use than the previous scaffolding member and scaffolding plate that were separate, but this proposed conventional device Therefore, it can be folded and stored compactly when not in use, but the strength of the legs when using it is insufficient due to the pursuit of compactness, and therefore it is fatal to have instability. There was a target flaw.

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 can be firmly expanded to provide sufficient load and vibration to the stage section. It is an object of the present invention to propose a joint device of a reinforcing crosspiece for a work scaffold that has durability.

[0006]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, in the invention according to claim 1, if the reference numerals shown in the embodiments are attached and shown, the stage part 1 to be worked and the back side of the stage part 1 are expanded. A work scaffold which has leg reinforcement bars 5 and 6 which are foldable interlocking with the left and right legs 2a to 2d which are upright in an open state and are foldable. The leg body is provided between the upper crosspiece member 23 forming the reinforcing crosspieces 5 and 6 and the lower crosspiece member 24 pivotably attached to the upper crosspiece member 23 via the joint shaft 25 so as to be foldable in two. A joint device 8 which also functions as a holding means 7 for automatically holding the legs 2a to 2d in the expanded state when the 2a to 2d are expanded is adopted.

In the invention according to claim 2, the holding means 7 for holding the legs 2a to 2d in the expanded state is provided with an opening lever 32 for releasing the held state. The configuration described in 1 is adopted.

[0008]

[Action]

According to the first aspect of the invention, the legs 2a to 2d 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 their storage positions. When the working scaffold is set to the use position, the reinforcing bars 5 and 6 extend from the folded state to the straight state in association with the movement of the legs 2a to 2d, so that the work scaffold can be easily set to the used state. be able to.

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

Further, the left and right reinforcing bars 5 and 6 which reinforce the leg bodies 2a to 2d are folded in two by following the leg bodies 2a to 2d by folding the leg bodies 2a to 2d to the storage position. Since it can be folded without interfering with ~ 2d, it can be stored compactly as in the conventional device, despite having the reinforcing bars 5 and 6.

Furthermore, when the legs 2a to 2d are expanded from their storage positions to the use positions, the joint device 8 provided on the reinforcing bars 5 and 6 is automatically operated so that the reinforcing bars 5 and 6 can be operated. The leg 2a to 2d is automatically held firmly in its use position by extending the leg 2a to 2d and maintaining the leg in a straight state. At this time, as a means for holding the legs 2a to 2d in their use positions, it is conceivable to provide a holding means at the base between the stage portion and the legs, but if the means is not provided at the base of the legs. However, its holding strength is weak, and it is difficult to prevent shaking and impact due to vibration applied to the stage part. On the other hand, by providing the joint device 8 which also serves 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 received by the stage portion 1. It is possible to reliably prevent the legs 2a to 2d from being shaken against vibration or impact.

According to the second aspect, the holding means 7 for holding the legs 2a to 2d in the expanded state is provided with the opening lever 32 for releasing the holding state. Therefore, the opening lever 32 It is possible to simply and easily fold the reinforcing bars 5 and 6, and thus the legs 2a to 2d, to the back side of the stage portion 1 in a stored state by only one-touch operation.

[0014]

【Example】

 FIG. 1 is a front view of an embodiment of the present invention, in which a worker rides on a ceiling or the like to work. The stage portion 1 has a rectangular shape as shown in FIG. A tread plate 9 made of metal such as spansion metal is integrally provided on a 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 surface side of the stage portion 1 in the front-rear direction, and the U-shaped opening portions 11a and 11b are downward in the left-right opposing direction. 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, and the leg mounting shafts 12 are mounted on the front and rear of the left and right leg mounting shafts 12, respectively. 2 (2a, 2c and 2b, 2d) are 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 base portion 13 of the body 2 is 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 13 is attached to the leg mounting shaft 12, and a first leg member 14 having a smaller diameter than that of the first leg member 14. The second leg member 15 and the second leg member 15 are combined with each other, and the leg length adjusting device 16 can extend and retract the second leg member 15 with respect to the first leg member 14. In the left and right second leg members 15 and 15, the leg members 15 and 15 are also appropriately connected by the cross rail 35.

In the left and right legs 2a to 2d as shown in FIG. 1, particularly FIG. 3, the cross rails 3 are respectively provided between the lower ends of the first leg members 14 and 14 of the front and rear legs 2a, 2c and 2b, 2d. , 4 are attached so as to reinforce the left and right first leg members 14, 14 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 forward and rearward, as shown by the alternate long and short dash line in FIG. 2 or FIG. Mounting brackets 17, 18 having U-shaped cross-sections in which the openings 17a, 18a face in the opposite directions to the left and right are fixedly attached, and the mounting shafts 19, 20 are mounted to the mounting brackets 19, 20, respectively. Reinforcing bars 5 and 6 are pivotally connected between the horizontal bars 3 and 4. The reinforcing bars 5 and 6 are rotatably mounted between the two members. As a structure, both ends of the reinforcing bars 5 and 6 are rotatably connected between the bar mounting shafts 19 and 20 and the horizontal bars 3 and 4. Alternatively, both ends of the reinforcing crosspieces 5 and 6 may be integrally connected to the crosspiece mounting shafts 19 and 20 rotatably provided and the horizontal crosspieces 3 and 4, respectively.

As shown in FIG. 1, a joint device 8 for folding the reinforcing bars 5, 6 into two is provided in the middle of the reinforcing bars 5, 6 in the longitudinal direction. By folding the reinforcing bars 5 and 6 around the joint device 8, the legs 2a to 2d can be housed on the back side of the stage 1 in conjunction with this.

As shown in FIGS. 5 and 6, the joint device 8 has a cylindrical upper side lock body 21 and a lower side lock body 22, which are respectively the upper side rail members 23 of the reinforcing rails 5 and 6. The joint shaft 25 is fixed to the lower crosspiece member 24 by welding or the like, and the lock bodies 21 and 22 are fitted with the bifurcated connecting portions 21a and 22a in an inverted manner and attached to the connecting portions 21a and 22a. The lower rail member 24 of the reinforcing rails 5 and 6 is pivotally connected, and the lower rail member 24 of the reinforcing rails 5 and 6 can be folded in two in the A direction with respect to the upper rail member 23 as shown by the chain double-dashed line in FIG. It has become. 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 projectingly provided at the tip of the lock block 27, and the lock piece 28 engages with an engaging projection 29 provided on the lock body 21 on the upper side. A hollow portion 30 is provided in the lock block 27, and a lock spring 31 made up of a compression spring is housed in the lock block 27, one end of which is received by the peripheral surface 25a of the joint shaft 25, and the other end thereof is the hollow portion 30. The lock surface 28a of the lock piece 28 is strongly pressed and engaged with the engaging surface 29a of the engaging projection 29 of the upper side lock body 21 by being received by the inner wall 30a of the upper lock body 31 and biased by the lock spring 31. ing.

Further, 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 front end of the lock block 27 is formed as described later. A guide surface 27a for the lock block 27 to slide along the corner portion 29b (FIG. 6) of the engaging projection 29 when the lower rail member 24 is extended from the upper rail member 23 from the folded state. To do.

In the state of FIG. 6, the lock piece 28 of the lock block 27 pivotally attached to the lock shaft 26 of the lower lock body 22 is caused by the urging force of the lock spring 31 to the engaging protrusion 29 of the upper lock body 21. The state is shown in which the upper rail member 23 and the lower rail member 24 are linearly locked by being strongly pressed and engaged. In order to perform the opening operation from this locked state to the state in which the lower rail member 24 is folded in two with respect to the upper rail member 23 as shown in FIG. 8, the opening lever 32 is changed from the state of FIG. 6 to that of FIG. As described above, it is sufficient to rotate downward in the direction of arrow B against the biasing force of the lock spring 31. By this operation, the lock piece 28 is separated from the engaging projection 29 and the engagement state between them is released, and in this state, the lower crosspiece member 24 is moved in the direction of the arrow A in the direction of the arrow as shown by the two-dot chain line in FIG. By rotating upward about 25, the lower rail member 24 can be folded in two so as to be folded over the upper rail member 23 as shown in FIG.

In order to extend the lower crosspiece member 24 again from this folded state to the straight line state as shown by the arrow C in FIG. 8, the lower crosspiece member 24 is moved downward about the joint shaft 25. When the lock block 27 is rotated, the guide surface 27a of the lock block 27 comes into contact with the corner portion 29b of the engaging protrusion 29 of the upper crosspiece member 23 and is pushed by the engaging protrusion 29 so that the lock block 27 is provided with the lock spring 31. It slightly sinks into the joint shaft 25 side against the power. The guide surface 27a slides on the corner portion 29b of the engaging projection 29 by rotating the lower crosspiece member 24 more strongly, and passes through the corner portion 29b, whereby the lock block 27 engages with the engagement. Since it is released from the pressing force of the projection 29, the lock spring 31 is urged to project from the retracted state, and the locking piece 28 of the lock block 27 engages with the engaging projection 29, so that both the crosspiece members 23. That is, the linear state of 24 will be strongly maintained.

As described above, the joint device 8 locks both the reinforcing bars 5 and 6 in a straight line state, and maintains this state, so that the leg bodies 2 to be reinforced by the two reinforcing bars 5 and 6 are in an upright state, that is, in the use state. The joint device 8 also serves as the position holding means 7 since it holds the working state.

FIG. 9 shows a state in which the joint shaft 25 connecting the upper side lock body 21 and the lower side lock body 22 and the lock spring 31 are attached, and the joint shaft 25 indicates the upper and lower lock bodies 21. , 22 and a hollow portion 30 of a lock block 27 which is sandwiched between the lock bodies 21 and 22 and is pivotally supported by a lock shaft 26 so as to be slidable. There is. Therefore, with this alone, the joint shaft 25 can be easily extracted from the shaft holes 21b and 22b. However, as described above, the lock spring 31 is provided between the peripheral surface 25a of the joint shaft 25 and the inner wall 30a of the hollow portion 30, but both ends of the lock spring 31 are located at the peripheral surface 25a of the joint shaft 25. The small groove 33 formed in the hollow portion and the small protrusion 34 protruding from the inner wall 30a of the hollow portion 30 are engaged with each other, so that the lock spring 31 is prevented from coming off the hollow portion 30. The joint shaft 25 is restricted by the lock spring 31 so as not to come off from the shaft holes 21b and 22b.

Therefore, when it is necessary to disassemble the upper rail member 23 and the lower rail member 24 of the reinforcing rails 5 and 6 for repair, storage, etc., as shown in FIG. By removing 1 from the hollow portion 30 against its urging force, the joint shaft 25 can be easily ejected from the shaft hole, whereby both the crosspiece members 23, 24 can be disassembled, which is practical. is there.

In FIG. 1, casters 36 with stoppers are attached to the lower ends of the second leg members 15 of the legs 2a to 2d.

Therefore, during use as shown in FIG. 11, 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 jointed. Extend from the state of being folded in half at 8 to make it straight. By extending the reinforcing bars 5 and 6 in a straight line in this manner, the holding means 7 also serving as the joint device 8 provided on the reinforcing bars 5 and 6 strongly keeps 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 use state. By providing the holding means 7 on the reinforcing bars 5 and 6 which reinforce the leg bodies 2a to 2d in this manner, the leg bodies 2a to 2d can be prevented from swaying particularly in the left-right direction and the upright state can be strongly maintained. it can.

After all, according to the embodiment of the present invention, the lateral 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 rocking to the front, rear, left and right. However, it has strong durability against the load and vibration of the worker etc. on the stage unit 1.

When the legs 2a to 2d are stored on the back surface 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. The holding action of the holding means 7 is released with one touch, and the reinforcing bars 5 and 6 are folded in two around the joint device 8 so that the left and right legs 2a, 2c and 2b are interlocked with this. 2d will be folded and stored on the back side of the stage unit 1.

FIG. 4 shows this stored state, in which 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 part 1. Since the casters 36 at the tips of the legs 2 are also stored sideways, the casters 36 will 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 surface side of the stage unit 1, so that it does not become bulky during transportation and storage.

[0035]

[Effect of device]

 According to the invention according to claim 1, the reinforcing bars are integrally provided on the front, rear, left and right legs that support the stage part for performing work, and when each leg is set from the storage position to the use position, Since the reinforcing bar automatically extends from the folded state to the straight state in conjunction with the movement of each of these legs, the working scaffold can be easily set to the used state.

In addition, by expanding each leg from its storage position and erecting it to the use position, these legs are directed in the left-right and front-rear direction by the reinforcing bar and the lateral bar extending in a straight line. Since it is strongly reinforced by blocking the vibration to the stage, it has sufficient durability against the load and vibration received on the stage part.

Furthermore, since the left and right reinforcing bars that reinforce each leg are designed so that the left and right reinforcing bars are folded in two in accordance with the storage operation of each leg, it is possible to have the reinforcing bars. Nevertheless, it can be stored compactly as in the conventional device.

Furthermore, by expanding each leg from its storage position to the use position, the joint device provided on the reinforcing bar automatically operates to extend the reinforcing bar into a linear state and maintain the linear state. However, this 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 part and the legs as a means for holding each leg at its use position, but if the means is provided at the base of the leg, Since the holding strength is weak, it is difficult to prevent the shaking caused by the vibration applied to the stage.

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

According to the second aspect, since the holding means for holding the leg body in the expanded state is provided with the release lever for releasing the held state, it is easy to perform by one-touch operation of the release lever. The reinforcing bar, and hence each leg, can be easily folded on the back side of the stage section in a retracted state, which has the effect of facilitating work during storage and transportation.

[Brief description of drawings]

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

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 an exploded perspective view showing an embodiment of the present invention.

FIG. 6 is a vertical sectional front view of the same.

FIG. 7 is a vertical sectional front view showing the same operating state.

FIG. 8 is a vertical sectional front view showing the same operating state.

FIG. 9 is a vertical sectional front view of the main part.

FIG. 10 is an exploded perspective view showing the same usage state.

FIG. 11 is an explanatory view showing a usage state of the present invention.

[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 32 Release lever

Claims (2)

[Scope of utility model registration request] 1. A foldable member that interlocks with these leg members between a stage unit for performing work and left and right leg members that are erected upright and foldable on the back side of the stage unit. On a work scaffolding equipped with various leg reinforcement bars,
The leg is in an expanded state between an upper rail member forming the leg reinforcing rail and a lower rail member pivotally attached to the upper rail member via a joint shaft so as to be foldable in two. Work scaffolding equipped with a joint device that also serves as a holding means for automatically holding the legs in an expanded state when 2. The work scaffold according to claim 1, wherein the holding means for holding the leg body in the expanded state is provided with an opening lever for releasing the held state.