JP2014224372A - Stair mobile scaffolding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stair mobile scaffolding that facilitates turning at a folding staircase landing.SOLUTION: A stair mobile scaffolding includes: a traveling part including a pair of left and right first crawler units, and a pair of left and right second crawler units bendably connected through a connecting shaft at one end part in the fore-and-aft direction of the pair of left and right first crawler units; and a scaffolding part turnably mounted on the traveling part using the connecting shaft as a turning center, and enabling a worker to board thereon. The stair mobile scaffolding includes: four casters provided in the traveling part while being spaced apart at right and left and front and back; and lifting means for automatically lifting the casters between a lowered position where the casters can be grounded and a raised position where the first and second crawler units can be grounded.

Description

  The present invention relates to a mobile scaffold, and more particularly, to a stair mobile scaffold capable of moving up and down stairs.

  In new construction and renovation work, it is necessary to build a scaffolding on the stairs to perform work above the stairs, but permanent installation of the scaffolding on the stairs that will be the work flow line will impair the overall workability. There is a case. Therefore, a staircase moving type scaffold has been proposed. For example, Patent Document 1 discloses a step-up / down-refractive lifter in which a main crawler unit and an auxiliary crawler unit are flexibly connected. Patent Document 1 describes that a hand-carrying can be performed by a caster that can be moved in and out of the crawler unit by a manual operation, and that a wheel is provided below the outrigger is illustrated. Yes.

Japanese Patent No. 4064371

  When a straight staircase is targeted, such as a staircase in a station, there is no problem even if its turning ability is inferior. However, when turning up a stairs such as a building, a turn at a landing is required for ascending and descending. In a general folding staircase, the effective width of the landing is 1200 mm and the effective width of the staircase is 900 mm, and the turning space at the landing is limited.

  In the stair lift / refraction type lifter disclosed in Patent Document 1, attention is not paid to the turning performance, and it is considered that when the vehicle turns with the wheel under the outrigger, the wheel protrudes to the four corners of the lifter and the small turn does not work. Moreover, since the caster which can be moved in and out with respect to the crawler unit has to be moved in and out by manual operation, and the bending of the crawler unit is necessary as a premise thereof, it is complicated to perform these operations at the landing.

  An object of the present invention is to facilitate turning at a landing of a folded staircase.

  According to the present invention, the pair of left and right first crawler units and the pair of left and right second crawler units that are flexibly connected to one end in the front-rear direction of the pair of left and right first crawler units via a connecting shaft. A stair-moving scaffold comprising: a traveling portion provided with a scaffold portion that is mounted on the traveling portion so as to be rotatable about the connecting shaft as a rotation center and on which an operator can ride; A caster provided with four wheels in the traveling portion, a lifting means for automatically raising and lowering the caster between a lowered position where the caster can be grounded and a raised position where the first and second crawler units can be grounded A stair-moving scaffold is provided.

  ADVANTAGE OF THE INVENTION According to this invention, turning in the landing place etc. of a folding staircase can be made easy.

1 is a side view of a staircase moving type scaffold according to an embodiment of the present invention. FIG. 2 is a front view of the staircase moving type scaffold of FIG. 1. The figure which shows the staircase installation example of the stair movement type | formula scaffold of FIG. (A) is a top view of a traveling part, (B) is structure explanatory drawing of a traveling part. (A) is a top view of a caster and a raising / lowering mechanism, (B) is a side view of a caster and a raising / lowering mechanism, (C) is a figure which shows the modification example of a raising / lowering mechanism.

  FIG. 1 is a side view of a stair-moving scaffold A according to an embodiment of the present invention, FIG. 2 is a front view of the stair-moving scaffold A, and FIG. . In each figure, X and Y indicate horizontal directions orthogonal to each other, and Z indicates an up-down direction (vertical direction). The stair moving type scaffold A includes a scaffold part 1, a traveling part 2, a caster 3, and an elevating mechanism 4.

  The scaffold part 1 has a rectangular parallelepiped shape as a whole. The scaffold unit 1 includes a base unit 11, a work table 12, and a lift mechanism 13.

  The work table 12 is a table on which an operator gets on, and a handrail 12a is provided on four sides thereof to prevent the operator from falling. In the present embodiment, the work table 12 can be moved up and down by providing a pantograph lift mechanism 13 between the base portion 11 and the work table 12. The lift mechanism 13 moves up and down the workbench 12 between the lowered position shown in the actual battle of FIG. 1 and the raised position shown by the broken line by operating the plurality of link members 13a by an actuator (not shown) (for example, a hydraulic cylinder). To do. By allowing the work table 12 to be moved up and down, it is possible to move more safely by allowing the work platform 12 to be lowered while being moved while allowing work at a higher place.

  Outriggers 14 are fixed to the four corners of the base portion 11. The outrigger 14 is extendable in the Z direction, and as shown in FIG. Thereby, the scaffold part 1 can be stably installed on the stairs. The outrigger 14 contracts as shown in FIG. 1 and moves away from the ground surface during movement, so that the traveling by the traveling unit 2 is not hindered.

  The base portion 11 is also provided with a handle 15 for pushing. As shown in FIG. 1, the operator can move the stair-moving scaffold A manually through the handle 15. In the case of the present embodiment, the handle 15 is supported so as to be rotatable around an axis in the X direction, and is rotatable within a range indicated by an arrow d1 in FIG. The handle 15 is releasably fixed at a position indicated by a solid line in FIG. 1 and a position indicated by a solid line in FIG. 3 by an engagement mechanism (not shown). The handle 15 is positioned at a relatively upper position as shown in FIG. 1 to facilitate hand pushing, and the handle 15 is positioned at a relatively lower position as shown in FIG. In order to do this, a simple step that can be used as a platform is formed. As described above, in this embodiment, since the handle 15 is rotatable, a step function can be added in addition to the handle function.

  Below the base portion 11, a hydraulic device 5a that generates hydraulic pressure, a control panel 5b, a battery 5c, an inclinometer 5d, and the like are supported by the base portion 11 via brackets.

  Next, the traveling unit 2 will be described with reference to FIG. 4 in addition to FIGS. FIG. 4A is a plan view of the traveling unit 2. FIG. 4B is an explanatory diagram of the structure of the traveling unit 2, and mainly illustrates a structure in which the scaffold unit 1 is mounted on the traveling unit 2.

  The traveling unit 2 includes a pair of left and right main crawler units 21 and 21 and auxiliary crawler units 22 and 22. The main crawler units 21 and 21 are arranged in parallel to the outside so as to sandwich the auxiliary crawler units 22 and 22, and the auxiliary crawler units 22 and 22 are arranged close to and parallel to each other. 21 is connected to one end in the front-rear direction (traveling direction) of 21 via a connecting shaft 23 so as to be bent.

  The main crawler unit 21 includes a driving pulley 211, a driven pulley 212, and an endless belt 213 wound around them, and protrusions for preventing slipping are intermittently formed on the surface of the endless belt 213. The main crawler units 21 and 21 include a common drive unit 214. The drive unit 214 includes, for example, a motor and a speed reducer, and rotates each drive pulley 211. The driven pulley 212 is rotatably supported on the connecting shaft 23. When the drive pulley 211 is rotated by driving the drive unit 214, the endless belt 213 travels cyclically in the Y direction, and the driven pulley 212 is rotated. The main crawler unit 21 includes a support portion 215 inside the endless belt 213, and this support portion 215 includes a mechanism for adjusting the endless belt 213 by adjusting the distance between the driving pulley 211 and the driven pulley 212. The connecting shaft 23 is supported by this mechanism.

  The auxiliary crawler unit 22 includes a drive pulley 221, a driven pulley 222, and an endless belt 223 wound around them, and a non-slip protrusion is intermittently formed on the surface of the endless belt 223. The driving pulley 221 is rotatably supported by the connecting shaft 23, and is connected to the driven pulley 212 of the main crawler unit 21 so as to rotate integrally. Accordingly, it is possible to transmit the drive of the drive unit 214 to the auxiliary crawler unit 22 while flexibly connecting the auxiliary crawler unit 22 to the main crawler unit 21. When the drive pulley 221 is rotated, the endless belt 223 travels cyclically in the Y direction, and the driven pulley 222 is rotated. The auxiliary crawler unit 22 includes a support portion 225 inside the endless belt 223, and this support portion 225 includes a mechanism for adjusting the endless belt 213 by adjusting the distance between the shaft and the drive pulley 221, and a driven pulley 222. Is supported by a shaft provided in this mechanism.

  Further, an auxiliary wheel unit 226 supported by a support portion 225 is provided at the tip of the auxiliary crawler unit 22 (not shown in FIG. 3). The auxiliary wheel unit 226 includes a plurality of auxiliary wheels 226 a and improves the traveling stability of the traveling unit 2.

  Then, the structure which mounts the scaffold part 1 on the driving | running | working part 2 is demonstrated. The traveling unit 2 includes a plurality of support frames 24 that connect the main crawler units 21, and a rectangular support frame 25 that is supported by the respective support units 215 and is positioned above the traveling unit 2.

  An attachment portion 24 a for attaching the posture control actuator 6 is fixed to the support frame 24. In the case of this embodiment, the actuator 6 is a hydraulic cylinder including a rod portion 6a and a cylinder portion 6b, and the tip of the rod portion 6a is pivotally supported by the mounting portion 24a.

  An attachment portion 25 a for attaching the bending control actuator 7 is fixed to the support frame 25. In the case of this embodiment, the actuator 7 is a hydraulic cylinder including a rod portion 7a and a cylinder portion 7b, and the rear end of the cylinder portion 7b is pivotally supported by the mounting portion 25a. The tip of the rod portion 7a is pivotally supported by the mounting portion 26a of the support frame 26 so as to be rotatable. The support frame 26 is supported by the support portion 225 between the auxiliary crawler units 22. Thus, as shown by the arrow d2 in FIG. 1, the auxiliary crawler unit 22 can be rotated with respect to the main crawler unit 21 by the expansion / contraction operation of the actuator 7, and both can be bent and formed into a rod shape. Become.

  The traveling unit 2 also includes support frames 27, 27 provided between the main crawler unit 21 and the auxiliary crawler unit 22 so as to be rotatable around the connecting shaft 23. At the upper end portion of the support frame 27, there are formed mounting portions 27a for attaching the lower end portions of two sets of support members 8 and braces 9 (only one set on the back side is shown in FIGS. 1 and 3). Yes. The column member 8 and the brace 9 have their lower ends fixed to the mounting portion 27 a and their upper ends fixed to the base portion 11. An intermediate portion of one brace 9 is provided with a shaft support portion 9a that supports the cylinder portion 6b of the posture control actuator 6 via a pin 6c.

  Thus, the scaffold unit 1 is mounted on the traveling unit 2 so as to be rotatable around the connecting shaft 23, and by the expansion / contraction operation of the actuator 6, the plane movement posture shown in FIG. 1 and the scaffold unit 1 and the traveling unit 2 are relative to each other. The posture of the stair-moving scaffold A can be changed to a stair-moving posture that is inclined obliquely.

  Next, the caster 3 and the lifting mechanism 4 that lifts and lowers the caster 3 will be described with reference to FIGS. 1 to 5. FIGS. 5A and 5B are a plan view and a side view of the caster 3 and the lifting mechanism 4, and FIG. 5C is a view showing a modification example of the lifting mechanism 4.

  The casters 3 are provided in the traveling unit 2 so as to be spaced apart from each other in the left and right directions, and the wheels 3a, the support members 3b for supporting the axles 3b 'of the wheels 3a, and the support members 3b around the axis 3c' in the Z-axis direction. And a support member 3c that is rotatably supported. Further, the rear wheel caster 3 includes a stepping type lock mechanism 3d for restricting the rotation of the wheel 3a.

  In the case of the present embodiment, each caster 3 is arranged at the outermost part in the left and right width direction of the traveling unit 2, and in particular, it is arranged at the outermost part in the left and right width direction even when viewed in the entire staircase moving scaffold A. Yes. This is because the tread length W2 which is the center distance between the casters 3 of the left and right wheels is substantially equal to the width of the staircase moving scaffold A, and the running stability by the casters 3 can be improved while downsizing the staircase movable scaffold A. it can.

  The inter-axle distance (wheel base) W1 between the casters 3 of the front and rear wheels is preferably equal to or less than the width of the stair-moving scaffold A, for example, the inter-axle distance W1 ≦ tread length W2. This can improve the turning performance of the stair moving type scaffold A by the casters 3.

  In the case of this embodiment, the lifting mechanism 4 is provided in two sets, one for the left front wheel caster 3 and the other for the right front wheel caster 3. The lifting mechanism 4 includes a support member 41, a support member 42, a link member 43, and an actuator 44 that is a drive source.

  The support member 41 is a front support member that supports the caster 3 by attaching the support member 3c of the caster 3 of the front wheel. The support member 41 includes a horizontal plate portion that overlaps with the support member 3c and a vertical portion that is orthogonal to the horizontal plate portion. It is said that. In the case of the present embodiment, the support member 41 is directly supported on the end of the connecting shaft 23. However, a configuration in which the support member 41 is supported by another member can also be employed. In the case of this embodiment, since the connecting shaft 23 is close to the supporting member 41 among the supporting members 41 and 42, the supporting member 41 is supported on the same axis as the connecting shaft 23. Depending on the positional relationship, the support member 42 may be coaxially supported with the connecting shaft 23. Further, the support member 41 of the present embodiment is configured to support the caster 3 on the auxiliary crawler unit 22 side with respect to the connecting shaft 23. This makes it difficult for the stair-moving scaffold A to fall to the auxiliary crawler unit 22 side when the caster 3 travels with the auxiliary crawler unit 22 bent with respect to the main crawler unit 21.

  The support member 42 is a rear support member to which the support member 3 c of the caster 3 for the rear wheel is attached and supports the caster 3. The support member 42 includes a horizontal plate portion that overlaps the support member 3c and a vertical portion that is orthogonal to the horizontal plate portion, and the vertical portion is pivotally supported by a shaft 28 that protrudes laterally from the support portion 215 of the main crawler unit 21. The whole is rotatable around the shaft 28.

  As described above, in this embodiment, the support members 41 and 42 are pivotally supported on the side portion of the main crawler unit 21, and the elevating mechanism 4 does not straddle the main crawler unit 21 and the auxiliary crawler unit 22. In this embodiment, since the main crawler unit 21 and the auxiliary crawler unit 22 are bendable, the caster 3 can be moved up and down without being affected by the posture of both.

  Both ends of the link member 43 are pivotally supported by the support members 41 and 42, respectively, and connect the support members 41 and 42. The support member 42 is rotated by the rotation of the support member 41 by the link member 43 so that both rotations are interlocked. In the present embodiment, the actuator 44 is a hydraulic cylinder that includes a rod portion 44a and a cylinder portion 44b and connects the support members 41 and 42 to each other. The tip of the rod portion 44a is pivotally supported by the support member 41 so as to be rotatable. The rear end of the cylinder portion 44b is rotatably supported by a shaft support member 25b fixed to the support frame 25.

  Accordingly, as shown in FIG. 5 (B), the caster 3 is moved between the lowered position where the caster 3 can come into contact with the traveling surface such as the work floor and the raised position shown in FIG. Can be raised and lowered automatically.

  In the present embodiment, the casters 3 are swung up and down by rotating the support members 41 and 42. However, the casters 3 may be lifted and lowered by translational movement. Moreover, the structure of the raising / lowering mechanism 4 is not restricted to the thing of this embodiment, Various structures are employable.

  The overall function of the staircase moving scaffold A having such a configuration will be described. In the stair moving type scaffold A, an operator gives an operation instruction by a portable controller (not shown) connected to the control panel 5b, and the control panel 5b controls each part according to the operation instruction. When moving on a flat work floor, manual push by rolling of casters 3 is efficient. In this case, as shown in FIG. 5B, the actuator 44 of the elevating mechanism 4 is extended so that the caster 3 is positioned at the lowered position and grounded. 1 and 2 show this state, and the main crawler unit 21 and the auxiliary crawler unit 22 are in a state of floating from the work floor. The operator holds the handle 14 and moves the stair moving type scaffold A.

  When the stairs are raised and lowered, the main crawler unit 21 and the auxiliary crawler unit 22 move. In this case, as shown in FIG. 5C, the actuator 44 of the lifting mechanism 4 is contracted to move the caster 3 to the raised position. As the caster 3 is raised, the entire staircase moving scaffold A descends, and the main crawler unit 21 and the auxiliary crawler unit 22 are grounded on the work floor. Thereafter, the drive unit 214 is driven, and the stairs are moved up and down by the traveling of the main crawler unit 21 and the auxiliary crawler unit 22. At that time, if necessary, the actuator 6 can be expanded and contracted to rotate the scaffold part 1 relative to the traveling part 2 so that the scaffold part 1 takes a horizontal posture. FIG. 3 shows a state in which the caster 3 is raised, and the caster 3 is in a floating state with respect to the running surface L of the main crawler unit 21 and the auxiliary crawler unit 22. When moving up and down the stairs, the actuator 7 is driven as necessary to bend the main crawler unit 21 and the auxiliary crawler unit 22.

  When traveling on a turn-up stairs, it is necessary to turn the stair-moving scaffold A at a landing on the way. In this case, as shown in FIG. 5B, the actuator 44 of the elevating mechanism 4 is extended so that the caster 3 is positioned at the lowered position and grounded. As the caster 3 comes into contact with the ground, the entire staircase moving scaffold A rises as the caster 3 descends, and eventually the main crawler unit 21 and the auxiliary crawler unit 22 float from the landing. At this time, since it is automatically raised and lowered by driving the actuator 44, the operation is simple even in a narrow landing.

  Subsequently, the operator turns the stair-moving scaffold A on the landing by holding the handle 15 or the like. Since the caster 3 is located at the outermost part in the left-right width direction of the stair moving type scaffold A, an area where the caster 3 turns is normally secured even at the landing if the stair part can be moved up and down. Further, in the present embodiment, the outrigger 14 is located inside the caster 3 when viewed in the left-right width direction of the stair-moving scaffold A, so that there are few cases where the outrigger 14 interferes with turning. After the turn, the main crawler unit 21 and the auxiliary crawler unit 22 can be grounded again and the stairs can be raised and lowered.

  As described above, in this embodiment, it is possible to facilitate turning at a landing site of a folded staircase or the like. Further, the scaffold 1 is lightened as a frame structure as a whole, and the hydraulic device 5a, the control panel 5b, the battery 5c and the like are disposed below the scaffold 1 as well as the traveling unit 2, so that the stair moving type The center of gravity of the scaffold A can be lowered, and the running stability can be further improved.

Claims (5)

A traveling unit including a pair of left and right first crawler units, and a pair of left and right second crawler units that are flexibly coupled to one end in the front-rear direction of the pair of left and right first crawler units via a coupling shaft;
A scaffolding portion that is mounted on the traveling unit so as to be rotatable about the connecting shaft as a rotation center and on which an operator can board;
In a staircase mobile scaffold with
A caster provided with four wheels in the traveling part apart from left and right and front and rear;
Elevating means for automatically raising and lowering the caster between a lowered position where the caster can be grounded and an elevated position where the first and second crawler units can be grounded;
A stair-moving scaffold characterized by comprising: Each of the casters is disposed at the outermost portion in the width direction of the traveling portion,
The stair-moving scaffold according to claim 1, wherein a distance between axles of the casters of the front wheel and the rear wheel is set to be equal to or less than a width of the stair-moving scaffold. The lifting means is
First elevating means for automatically elevating the casters on the left and right sides;
Second elevating means for automatically elevating the casters on the right and rear sides,
Each of the first and second lifting means is respectively
A driving source;
A front support member that is pivotally supported at the side of the first crawler unit and supports the casters of the front wheels;
A rear support member that is pivotally supported at a side portion of the first crawler unit and supports the caster of the rear wheel,
The stair-moving type scaffolding according to claim 1 or 2, wherein the caster is moved up and down by rotating the front support member and the rear support member by the drive source.   4. The staircase moving type scaffolding according to claim 3, wherein one of the front support member and the rear support member is pivotally supported coaxially with the connection shaft.   The stair-moving scaffold according to claim 4, wherein the drive source is a cylinder that connects the front support member and the rear support member.

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