JP2012127132A - Caster for moving type scaffolding device and moving type scaffolding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caster for a moving type scaffolding device, movable by a small force, stable even during turning when moving, and in which a brake can apply a strong braking force even to a double wheel caster having mutually independently rotatable wheels and safety in work using the scaffolding device is further enhanced.SOLUTION: A caster 14 is configured in such a manner that two wheels 20 mutually independently rotatable are coaxially held on an axle 34, each of the wheels 20 consisting of a wheel part 20a and a tire part 20b on the outer periphery of the wheel part, a brake disc 44 formed in a bent shape is provided on a yoke 21 via a bracket 22, and the brake disc 44 abuts on the two wheels 20 at the same time, a lower locking piece 46 formed in the lower part of the brake disc 44 and abutting on the outer peripheral surface of the wheels 20 having a fitting recess 47 of the tire parts 20b of the wheels 20.

Description

  The present invention relates to a mobile scaffold device called a rolling tower as a temporary mobile scaffold used in construction work, a caster for other mobile scaffold devices, and a mobile scaffold device using the caster.

  A rolling tower as a mobile scaffold is provided with a work floor in the uppermost layer of a frame structure assembled in a tower shape and a wheel at the lower end of a pedestal.

  FIG. 12 shows an example of such a rolling tower. The frame structure is the same as that of a normal fixed frame, and the building frames 1 and 2 connected up and down by the connecting pin 3 are spaced apart. A vertical construction surface is formed so as to face each other, and the braces 4 intersecting each other in the vertical construction surface are spanned to the side surface side to form a frame.

  In this way, the work floor is formed by passing the floor-attached cloth frame 5 to the uppermost part of the frame.

  In the illustrated rolling tower, two types of building frames are used, and the two types of building frames 1 and 2 are both pillar members 6 made of pipe material provided vertically, and pipe materials provided horizontally. The column member 6 is used for the vertical connection at the connecting pin 3.

  In addition, a horizontal member 9 parallel to the beam member 8 is provided on the left or right half of the building frames 1 and 2 with a vertical interval, and together with the beam member 8 forms a ladder as a step for raising and lowering. The building frames 1 and 2 are sometimes called ladder forms.

  The handrail support column 10 is further connected to the upper end of the column member 6 on the floor where the floor-attached cloth frame 5 is passed, and the handrail 11 is passed over the handrail support column 10.

  In the figure, reference numeral 13 denotes a holding frame (outrigger).

The wheel is a caster 14, for example, as disclosed in Patent Document 1 below, as shown in FIGS. When the scaffold pipe is fitted to the vertical axis 15, a key is inserted into the vertical groove 15b to prevent rotation.
Utility Model Registration No. 2590983

  A female screw ring 16 with a handle 16 a is screwed onto the vertical axis 15, and the protruding length of the leg ring is adjusted by the rotation of the female screw ring 16. In addition, a circular mounting plate 18 above the caster 14 is fixed to the lower end of the vertical axis 15.

  The caster 14 has a pivot shaft fixed at the center of the circular mounting plate 18, and an upper one 19 is rotatably disposed via a steel ball below the circular mounting plate 18. A yoke 21 that rotatably supports 20 is fixed.

  The upper inner side of the yoke 21 is supported by a lower one via a steel ball, and the outer periphery of the wheel 20 is formed of rubber or the like.

  The caster 14 has a pivot shaft fixed at the center of the circular mounting plate 18, and an upper one 19 is rotatably disposed via a steel ball below the circular mounting plate 18. A yoke 21 that rotatably supports 20 is fixed.

  As a brake mechanism of the caster 14, a brake cam is rotatably attached to an upper portion of a yoke 21 that supports the wheel 20 via a bracket, and the brake plate is pushed by a tip of the brake cam by rotating the brake cam. This structure locks the wheel by pressing the tip of the wheel against the wheel.

  Brackets 22 are fixed to both sides of the rear portion of the yoke 21, and brake plates 23 formed in an arc shape are engaged with the brackets 22 on both sides and vertically supported by engaging both sides thereof. The brake plate 23 is provided with an upper locking piece 26 that is in contact with the outer peripheral surface of the circular mounting plate 18 at the upper part of the caster, and a lower locking piece that is in contact with the outer peripheral surface of the wheel 20 at the lower part. 27 is formed.

  A brake cam 25 is rotatably supported on a horizontal shaft 24 supported by brackets 22 on both sides outside the brake plate 23, and a rod 28 is provided on the brake cam 25.

  In addition, since the turning axis of the caster 14 is coaxial with the longitudinal axis 15 and the axle position of the wheel 20 is deviated to the left of the turning axis, when the moving force acts on the longitudinal axis 15, the movement of the caster The direction is usually the right direction in FIG. Therefore, the forward rotation direction of the wheel of the caster 14 is the clockwise direction (arrow direction) in FIG. 14, and the acute angle portion of the lower locking piece 27 of the brake plate 23 is directed in the counterclockwise rotation direction.

  The mobile scaffolding leg ring configured as described above is attached to the lower part of the scaffolding pipe so that its longitudinal axis 15 is inserted into the pipe. In this attached state, since the lower end of the pipe contacts the female screw ring 16, the protruding length of the leg ring can be adjusted by rotating the female screw ring 16 and moving its position up and down.

  In the normal state, the mobile scaffolding leg wheel can move in the right direction in the figure when, for example, a rightward force is applied to the scaffold from the left side in FIG. 6. Rotate clockwise.

  When the brake is applied, the rod 28 of the brake cam 25 is pushed down, the brake cam 25 is rotated, and the brake plate 23 is pressed against the wheel 20 with a part thereof. Then, the upper locking piece 26 at the top of the brake plate 23 is pressed against the outer peripheral portion of the circular mounting plate 18 to lock the turning, and the lower locking piece 27 at the lower portion of the brake plate 23 is pressed against the outer peripheral portion of the wheel 20. The wheel 20 is locked.

The rolling tower as such a mobile scaffold is provided with regulations for safety. For example, in height regulation,
(1) When there is no frame (outrigger) The height (Hm) from the lower end of the ring (caster) to the work floor and the main shaft distance (Lm) of the caster that forms the outline of the rolling tower satisfy the following formula: It shall be.
H≤7.7L-5
(2) When having a retaining frame (outrigger) In a rolling tower having a retaining frame, the value of Lm in the equation (1) can be obtained by the following equation.
L = A + 1/2 (B1 + B2)
It is said.

Regarding the load capacity, the load capacity (Wkg) of the rolling tower shall be a value obtained by the following formula according to the work floor area (Am ² ).
When A ≥ 2, W = 250 (kg)
When A <2, W = 50 + 100A (kg)
The above formula is based on “Safety Technical Standards for Mobile Scaffolds” issued by the Temporary Industries Association.

Furthermore, as a precaution,
(1) Display the loaded load on the scaffold and do not load more than that load.
(2) Avoid giving eccentric load, horizontal load and impact load to the scaffold as much as possible.
(3) Do not use a stepladder, ladder, etc. on the work floor.
(4) Two or more people shall not be able to lift and lower at the same time from the same plane in a mobile scaffold that uses the outer space of the framework structure as a hoistway.
(5) Do not move while carrying workers.
(6) For use on inclined surfaces, stand the frame structure vertically with pedestal jacks and keep the work floor level.
(7) Install a scaffold at a position close to the work site so that the worker does not have to work in an unreasonable posture.
(8) The brakes for the ankles should always be activated except during movement.
(9) Obstacles on the road surface and space should be removed.
It is said.

  Although the rules are provided in this way, when the conventional moving scaffold is relatively small, the distance between the support legs supporting the scaffolding plate is narrow, and therefore, it becomes elongated vertically and poorly stable. Become.

  This unsatisfactory stability has a high risk of falling, especially when moving.

  For example, if each caster 14 is provided with a tire that is enlarged and widened according to the load resistance, the sense of stability increases. However, in particular, in the case of a wide tire, the contact area becomes large, so that a relatively large force is required when moving the rolling tower. Also, rolling towers often turn around corners with relatively small radii, and in the case of wide tires, when turning corners, the rotational difference between the inner and outer parts of the tire itself becomes large, and a relatively large force is applied. I need.

  Further, normally, a non-hollow tire (a tire in which a tire material is filled) is used at the outer peripheral portion of the wheel of each caster 14, and is repeatedly deformed and restored according to the load, and is cracked. And tire chipping may occur.

  Furthermore, when a brake for a leg is required to be always operated except during movement, a conventional caster cannot be said to have a brake that exerts a sufficient braking force, and in particular, works on it. Anxiety remains as a work platform.

  The present invention eliminates the inconveniences of the conventional example, and is a double-wheeled caster that can move with a small force even during movement, and has good stability in turning during movement, and can be rotated independently of each other. Even if there is a brake, it is providing the caster for a mobile scaffold apparatus and a mobile scaffold apparatus which can obtain strong braking force and can raise the safety | security at the time of the operation | work which uses a scaffold apparatus more.

  In order to achieve the above-mentioned object, the present invention according to claim 1 is directed to a caster for a mobile scaffold device in which a wheel comprising a wheel portion and a tire portion on an outer peripheral portion thereof is held coaxially by an axle, A double-wheel that can be rotated independently, and a brake plate that is bent and formed via a bracket is provided on the yoke, and the brake plate is an engagement piece that is in contact with the outer peripheral surface of the wheel that is formed below the brake plate. The gist of the present invention is to have a fitting recess for the tire part and to contact the two wheels simultaneously.

  As a mobile scaffold device, the present invention according to claim 8 is a method in which a frame formed by coupling a support column and a horizontal member is made parallel to each other with a gap, and a staggered difference or a scaffold plate is provided between these opposed frames. In a mobile scaffolding device that has a framework that spans and connects, and a caster attached to the lower end of the column, all the casters at the lower end of at least four columns positioned at the corner are fitted into the outer periphery of the wheel unit. A wheel made of a tire is coaxially held by an axle and is a twin wheel that can rotate independently of each other, and a brake plate that is bent through a bracket is provided on a yoke, and the brake plate The engaging piece which is in contact with the outer peripheral surface of the wheel formed in the above has a recess for fitting in the tire portion of the wheel and is intended to be in contact with the two wheels simultaneously.

  According to the first and eighth aspects of the present invention, the caster wheel is constituted by two tire portions having a relatively narrow width. Since it has two wheel parts with respect to a wide conventional caster having one wheel part, the strength of the wheel part is equal to or higher than that of the conventional caster. Further, since the ground contact area of the tire portion becomes small, the rolling resistance is also small, and the caster can be moved with a smaller force.

  Furthermore, since the two wheels are coaxial and can rotate independently, when turning corners, in addition to the narrow width of each wheel, the inner wheel and the outer wheel are different. Since it can rotate at the number of rotations, it is possible to turn with a smaller force even at a corner with a small radius.

  The brake plate of the brake has a fitting recess for the tire portion of the wheel and abuts against the two wheels at the same time. The tire portion fits into the fitting recess and is firmly fixed.

  According to the second aspect of the present invention, in the tire portion of the wheel, the left and right side surfaces are tapered with respect to the outer peripheral surface which is a rolling surface, and the fitting recess of the locking piece is also trapezoidal. This is the gist.

  According to the second aspect of the present invention, not only the outer peripheral surface that is the rolling surface but also the side surface that expands in a tapered shape enters the tire portion into the recess for fitting, and friction resistance is generated on both the outer peripheral surface and the side surface. As a result, a reliable brake is applied to the two wheels simultaneously with a wedge-shaped engagement.

  According to a third aspect of the present invention, the brake plate includes an upper locking piece that comes into contact with the outer peripheral surface of the circular mounting plate at the upper part of the caster and a lower locking piece that comes into contact with the outer peripheral surface of the wheel. The gist of the present invention is that a reinforcing rib is formed so as to straddle.

  According to the third aspect of the present invention, even if the upper locking piece and the lower locking piece are bent, the strength of the brake plate is increased by forming the reinforcing ribs straddling both.

  According to a fourth aspect of the present invention, a gear groove is formed on the outer peripheral surface of the circular mounting plate on the upper caster, and the upper locking piece of the brake plate is curved along the outer peripheral surface of the circular mounting plate on the upper caster. The gist is that the inner surface is a gear surface meshing with the gear groove.

  According to the fourth aspect of the present invention, when the brake is applied, the upper locking piece on the upper part of the brake plate is pressed against the outer peripheral portion of the circular mounting plate to lock the turning. Since the contact with the outer peripheral portion of the mounting plate is performed by the relationship between the gear groove and the gear meshing with the gear groove, stronger restraint can be obtained.

  According to the fifth aspect of the present invention, the bending angle of the brake plate is such that the engagement piece is engaged with the tire portion of the wheel from the lower position as much as possible while the tip is directed to the axle and is above the side. The gist is to set the angle to 130 ° or less.

  According to the fifth aspect of the present invention, the brake plate is inserted from a position where the locking piece approaches a side of the tire portion of the wheel, and the tire portion is securely fitted in the fitting recess. can do.

  The gist of the present invention described in claim 6 is that the tire portion of the wheel is made of hard urethane rubber.

  According to the sixth aspect of the present invention, the tire portion of the wheel is a material suitable for molding into a shape in which the left and right side surfaces expand in a tapered shape with respect to the outer peripheral surface which is a rolling surface.

  The gist of the present invention described in claim 7 is that the brake cam pivotally supported by the bracket as the brake plate is operated is provided with a pedal protruding from the two rods to form a wheel. .

  According to the seventh aspect of the present invention, the pedal for operating the brake plate is formed as a ring body, so that it is light and easy to operate, there is little adhesion of dirt, and an excessive force is applied to break it. There is little risk of damage. Furthermore, since two rods act, a stable force can be applied to the brake plate even when the brake plate is simultaneously brought into contact with the two wheels.

  As described above, the caster and the mobile scaffold device of the present invention can be moved with a small force even during movement, and also have good stability in turning during movement, and are independent of each other. Even in the case of a twin-wheeled caster that can rotate, the brake can obtain a strong braking force and can further improve safety during work using the scaffold device.

  Hereinafter, the mobile scaffold device of the present invention will be described with reference to the drawings. In the present invention, the mobile scaffolding device main body is also formed by connecting a frame formed by the combination of the support column and the horizontal member with a space therebetween, and straddling the opposing frame members with a striation or a scaffolding plate. The caster is attached to the frame and the lower end of the support column, which is the same as that described with reference to FIG.

  In the mobile scaffold device of the present invention, the wheels 20 made of tires fitted to the outer peripheral portion of the wheel portion are all coaxially held by the axle on all of the casters 14 at the lower ends of at least four pillars positioned in the corner portion. The two wheels are rotatable independently of each other.

  1 to 3, 9, and 10 show an example of the caster 14, and the same components as those in FIGS. 13 and 14 showing the conventional example are given the same reference numerals. FIG. 1 shows when the brake is released, and FIG. 2 shows when the brake is applied.

  In the figure, reference numeral 15 denotes a vertical axis that is inserted into the lower part of the scaffolding pipe. When the vertical pipe 15b is formed on the left and right side surfaces of the vertical axis 15 with the screw 15a formed on the outer periphery, and the scaffolding pipe is fitted to the vertical axis 15 The key is inserted into the longitudinal groove 15b to prevent rotation.

  A female screw ring 16 with a handle 16a is screwed onto the vertical axis 15, and the lower end of the pipe abuts on the female screw ring 16 in the mounted state, so that the female screw ring 16 is rotated to move its position up and down. The protruding length of the leg ring can be adjusted.

  A circular mounting plate 18 above the casters 14 is fixed to the lower end of the vertical axis 15.

  The caster 14 has a pivot shaft 36 fixed to the center of the circular mounting plate 18, an upper one 19 is rotatably arranged, and a yoke 21 that rotatably supports a wheel 20 is fixed to the lower side of the upper one 19. Configured.

  The yoke 21 includes a pair of side walls 21a that rotatably support the wheel 20 by an axle 34, and a top plate 21b that connects the side walls 21a and 21a in the vertically upper part of the wheel 20.

  In the present invention, the upper bearing 37 is provided above the top plate 21b of the yoke 21, and the lower bearing 38 is provided below. The upper bearing 37 and the lower bearing 38 are the same member, and both are constituted by outer rings 37a and 38a, inner rings 37b and 38b, and bearings 37c and 38c.

  A first washer 39 is interposed between the outer ring 37a and the outer ring 38a, and similarly, a second washer 40 is interposed between the inner ring 37b and the inner ring 38b.

  The upper bearing 37 is disposed inside the upper one 19, and the lower bearing 38 is disposed in a recess formed in the top plate 21 b of the yoke 21.

  The swivel shaft 36 is continuous with the vertical axis 15, and is fixed by caulking by fitting nuts 35 a and 35 b above and below the upper bearing 37 and the lower bearing 38.

  Thus, by fixing the turning shaft 36 with the nuts 35a and 35b, the turning shaft 36, the upper inner ring 37b, and the lower inner ring 38b rotate integrally.

  The axle 34 that supports the wheel 20 in a rotatable manner is supported by the yoke 21, and the wheel 20 is rotatable around the axle 20, and a tire portion 20b that is fitted into the outer periphery of the wheel portion 20a. The two wheels 20 having the same diameter constituted by the wheel portion 20a and the tire portion 20b are held coaxially by the axle 34, and the wheels 20 are independent of each other. And can be rotated.

  The wheel portion 20a is rotatably engaged with a bush 32 fitted on the axle 34 with a bearing 33 interposed therebetween.

  As in the conventional example, brackets 22 are fixed to both sides of the rear portion of the yoke 21, and brake plates 44 are vertically supported by engaging both sides of the brackets 22 on both sides. The brake plate 44 is provided with an upper locking piece 45 that is in contact with the outer peripheral surface of the circular mounting plate 18 at the upper part of the caster, and a lower locking piece that is in contact with the outer peripheral surface of the wheel 20 at the lower part. 46 is formed.

  In the present invention, the lower locking piece 46 is a horizontally-long rectangular flat plate that is in contact with the two wheels 20 and 20 at the same time, and has a fitting recess for the tire portions 20b and 20b of the wheels 20 and 20 at the tip side. 47 and 47, which are in contact with the two wheels simultaneously. FIG. 4 is an explanatory diagram at the time of releasing the brake and at the time of braking from the AA arrow in FIG.

  As shown in FIGS. 5 to 7, the brake plate 44 has an upper locking piece 45 and a lower locking piece 46 that are bent and continuous, and the bending angle α is such that the lower locking piece 46 is connected to the wheels 20 and 20. An angle of 130 ° or less is set so that the front end is directed to the axle 34 with respect to the tire portions 20b and 20b and is engaged from the lower position as much as possible, although it is above the right side.

  The fitting recesses 47, 47 are formed side by side, but are notched in a horizontally long trapezoidal shape. In this way, the lower locking piece 46 is formed as three claw stoppers.

  Further, the brake plate 44 is formed by arranging the vertical reinforcing ribs 51 extending over both the upper locking piece 45 and the lower locking piece 46 at intervals of two lines.

  A gear groove 52 is formed on the outer peripheral surface of the circular mounting plate 18 at the upper part of the caster. Correspondingly, the upper end of the upper locking piece 45 of the brake plate 44 is along the outer peripheral surface of the circular mounting plate 18. A gear surface 53 that is curved and meshes with the gear groove 52 is formed.

  On the other hand, the tire portions 20b, 20b of the wheels 20, 20 are made of hard urethane rubber, and the left and right side surfaces 49 are tapered with respect to the outer peripheral surface, which is the rolling surface 48, and the lower locking piece 46 is fitted. It matches with the trapezoidal shape of the combined recesses 47 and 47.

  A horizontal shaft 24 is supported outside the brake plate 44 so as to connect the brackets 22 on both sides, and the brake cam 25 is rotatably supported on the horizontal shaft 24.

  The brake cam 25 is provided with a pedal 41. As shown in FIG. 9, the pedal 41 has a substantially triangular shape in which two rods 42 spread out in a square shape and the tip is connected as a horizontal bar. It formed as a ring body used as the enlarged diameter part 43 which forms a ring | wheel.

  In FIG. 1, reference numeral 50 denotes a leaf spring, which has a substantially bowl shape having a corner portion 50 b perpendicular to a tapered corner portion 50 a as shown in FIG. 7, with one end on the yoke 21 side and the other end on the brake plate 44. Combined and arranged. The bent piece from the right corner 50b is downward in the drawing, but may be upward.

  The brake plate 44 having such a structure is vertically mounted so that the notches on both sides thereof are engaged with the brackets 22 on both sides. In the non-brake state, the upper locking piece 26 is the circular mounting plate 18 on the upper part of the caster. The lower lower locking piece 46 does not lightly contact or contact the wheels 20, 20, and a part of the brake cam 25 is in contact with the central convex portion of the brake plate 44. . (See Figure 1)

  In this way, the mobile scaffold device of the present invention comprises the caster wheels 20, 20 with two tires having a relatively narrow width. Since it has two wheel parts with respect to a wide conventional caster having one wheel part, the strength of the wheel part is equal to or higher than that of the conventional caster. Further, since the ground contact area of the tire is small, the rolling resistance is small, and the caster can be used to move with a smaller force.

  When the brake is applied, the pedal 41 of the brake cam 25 is pushed down, the brake cam 25 is rotated, and the brake plate 44 is pressed against the wheel 20 side by a part thereof.

    Then, the upper locking piece 45 at the top of the brake plate 44 is pressed against the outer peripheral portion of the circular mounting plate 18, and the gear groove 52 and the gear surface 53 at the upper end of the upper locking piece 45 are formed on the outer peripheral surface of the circular mounting plate 18. And the turning is locked, and as shown in FIG. 4 (b), the lower locking piece 46 at the lower part of the brake plate 44 is pressed against the outer peripheral part of the wheel 20, and the tire part 20b is a recess for fitting. It fits in 47 and is firmly fixed.

  Moreover, when the tire portion 20b fits into the fitting recess 47, not only the outer peripheral surface which is the rolling surface 48 but also the side surface 49 spreading in a taper shape enters, and friction resistance is obtained on both the outer peripheral surface and the side surface, and the wedge A reliable brake is applied to the two wheels at the same time.

  Furthermore, the brake plate 44 is inserted from a position where the lower locking piece 46 approaches the side of the tire portion 20b of the wheel 20 so that the tire portion 20b is securely fitted in the fitting recess 47. Can do.

  As shown in FIG. 6, before the brake plate 44 is actuated, the leaf spring 50 has a tapered corner portion 50a that is lowered and a right angle portion 50b maintains the angle. The plate spring 50 resists the plate spring 50, and the plate spring 50 is deformed, and in this state, the lock of the plate spring 50 is maintained.

  In order to release the brake plate 44, the plate spring 50 is opposed to the plate spring 50, and the plate spring 50 returns to the original state.

  By interposing the leaf spring 50 in this way, strong elasticity can be obtained, the wheel 20 can be reliably locked by the brake plate 44, and the release operation can be easily obtained by repulsion at the time of release. Become.

1 shows one embodiment of a caster for a mobile scaffold device and a mobile scaffold device according to the present invention, and is a side view of a caster portion when a brake is released. FIG. 1 shows one embodiment of a caster for a mobile scaffold device and a mobile scaffold device according to the present invention, and is a side view at the time of braking of a caster portion. 1 shows one embodiment of the mobile scaffold device of the present invention and is a front view of a caster portion. It is explanatory drawing at the time of the brake cancellation | release from the AA arrow of FIG. 5, and a brake. It is a top view of the brake board used for the caster for mobile scaffold apparatuses of this invention. It is a side view of the brake board used for the caster for mobile scaffold apparatuses of this invention. It is a rear view of the brake board used for the caster for mobile scaffold apparatuses of this invention. It is a side view of the leaf | plate spring used for the caster for mobile scaffold apparatuses of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing a caster part of a caster part according to an embodiment of a caster for a mobile scaffold device and a mobile scaffold device of the present invention. 1 shows an embodiment of a mobile scaffold device of the present invention, and is a side view in which a caster portion is partially cut away. It is a top view of the pedal used for the caster for mobile scaffolding apparatuses of this invention. It is a perspective view which shows an example of a rolling tower. It is a front view of the caster of the conventional rolling tower. It is a side view of the caster of the conventional rolling tower.

1, 2 ... Building frame 3 ... Connecting pin 4 ... Cross brace 5 ... Cloth frame with floor 6 ... Pillar member
DESCRIPTION OF SYMBOLS 8 ... Beam member 9 ... Horizontal member 10 ... Handrail support | pillar 11 ... Handrail 13 ... Holding frame (outrigger) 14 ... Caster 15 ... Vertical axis 15a ... Male screw 15b ... Vertical groove 16 ... Female thread ring 16a ... Handle 18 ... Circular attachment Plate 19 ... Upper one 20 ... Wheel 20a ... Wheel portion 20b ... Tire portion 21 ... Yoke 21a ... Side wall 21b ... Top plate 22 ... Bracket 23 ... Brake plate 24 ... Horizontal shaft 25 ... Brake cam 26 ... Upper locking piece 27 ... Lower portion Locking piece 28 ... Rod 32 ... Bush 33 ... Bearing 34 ... Axle 35a, 35b ... Nut 36 ... Rotating shaft 37 ... Upper bearing 38 ... Lower bearing 37a, 38a ... Outer ring 37b, 38b ... Inner ring 37c, 38c ... Bearing 39 ... No. One washer 40 ... second washer 41 ... pedal 42 ... rod 43 ... expanded diameter part 44 ... brake plate 45 ... upper locking piece 46 ... lower part Recesses for locking pieces 47 ... the fitting 48 ... rolling surface 49 ... side 50 ... plate spring 50a ... tapered corners 50b ... perpendicular corners 51 ... reinforcing rib 52 ... gear grooves 53 ... gear surface

Claims (8)

  A wheel consisting of a wheel part and a tire part on the outer periphery of the wheel is coaxially held by an axle, and is a twin wheel that can rotate independently of each other, and a brake plate that is bent through a bracket is provided on a yoke. The brake plate has a locking piece abutting on an outer peripheral surface of a wheel formed in a lower portion of the brake plate. Type caster caster.   The wheeled tire part has a tapered left and right side surface with respect to the outer peripheral surface which is a rolling surface, and the engaging recess of the locking piece has a trapezoidal shape. caster.   The brake plate is composed of an upper locking piece that comes into contact with the outer peripheral surface of the circular mounting plate at the upper part of the caster and a lower locking piece that comes into contact with the outer peripheral surface of the wheel. The caster for a mobile scaffold device according to claim 1 or 2.   A gear groove is formed on the outer peripheral surface of the circular mounting plate on the upper caster, the upper locking piece of the brake plate is bent along the outer peripheral surface of the circular mounting plate on the upper caster, and the inner side meshes with the gear groove. The caster for a mobile scaffold device according to any one of claims 1 to 3, wherein the caster is a surface.   The bending angle of the brake plate is set to an angle of 130 ° or less so that the engaging piece is engaged with the tire portion of the wheel at the tip end toward the axle and engaged from the lower position as much as possible. The caster for a mobile scaffold device according to any one of claims 1 to 4.   The caster for a mobile scaffold device according to any one of claims 1 to 4, wherein the tire portion of the wheel is made of hard urethane rubber.   The movable scaffold device according to any one of claims 1 to 4, wherein a brake cam that pivotally supports the bracket as an actuating brake plate is provided with a pedal in which two rods come out to form a wheel. Casters.   A frame formed by joining the support column and the horizontal member is parallel to each other with a space between them, and a frame is formed by connecting the opposite frames to each other by straddling different scaffolds or scaffolding plates. In the mobile scaffolding device attached with the wheel, the wheels made of tires fitted to the outer peripheral part of the wheel part are all coaxially held by the axle on all of the casters at the lower ends of at least four columns located in the corner part. The brake plate is a double wheel that can be rotated independently of each other, and is provided with a brake plate bent on the yoke via a bracket. The brake plate is a locking piece that is in contact with the outer peripheral surface of the wheel formed below the brake plate. A mobile scaffold device having a fitting recess for a tire portion of a wheel and simultaneously contacting the two wheels.

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