JP5653662B2 - Mobile scaffold equipment - Google Patents

Description

  The present invention relates to a mobile scaffold device called a so-called rolling tower as a temporary mobile scaffold used in construction work or the like.

  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. 4 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 made up of pillar members 6 made of pipe material provided vertically and pipe members made horizontally. The beam member 8 is used as a constituent element, and a column member 6 is used for vertical connection at the connection 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 a ladder is formed as a step for raising and lowering together with the beam member 8. 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, also in Patent Document 1 below, but as shown in FIGS. 5 and 6, vertical grooves 15 b are formed on the left and right side surfaces of the vertical axis 15 formed with screws 15 a on the outer periphery. 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 the lower one via a steel ball, and the outer periphery of the wheel 20 is formed of hard urethane 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. 6, 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.

  An object of the present invention is to provide a mobile scaffold device that eliminates the inconveniences of the above-mentioned conventional example, can move with a small force even during movement, and has good stability even during turning during movement.

In order to achieve the above-mentioned object, the present invention according to claim 1 is configured such that a frame formed by coupling a support column and a horizontal member is parallel to each other at intervals, and a streak or a scaffolding plate is provided between the 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. Wheels made of tires are coaxially held on the axles and are twin wheels that can rotate independently of each other , and the yokes of the casters that support the axles that allow the wheels to rotate are mounted on both sides of the wheels. A pair of side walls that are opposed to each other, a top plate that connects the pair of side walls vertically above the wheel, and a lower bearing that is housed in a recess of the top plate, and an upper bearing that is provided above the bottom bearing, Turning An inner ring that can rotate integrally with the inner ring, and an outer ring that can rotate integrally with the yoke via a bearing with respect to the inner ring. A brake plate formed in an arcuate shape via a bracket is provided on the yoke, and the brake plate has a lower locking piece that is in contact with the outer peripheral surface of the wheel formed at the lower part thereof, and is in contact with the two wheels at the same time, A circular mounting plate that covers the upper bearing from above and from the side is provided at the lower end of the vertical axis that is inserted into the lower end of the support column, and the upper locking piece of the brake plate is in contact with the circular mounting plate. It is a summary.

  According to the first aspect of the present invention, the wheels of the caster are constituted by 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. In addition, since the ground contact area of the tire is small, the rolling resistance is 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.

  In addition, the lower bearing and the upper bearing provided above it provide smooth rotation (revolution) of the yoke and wheels.The wheels are held coaxially on the axle and can rotate independently of each other. Corresponding to being a twin wheel, both the revolution and the rotation of the wheel can be performed without any trouble. Further, the lower bearing and the upper bearing provided thereabove can accommodate these in a compact manner, and there is little risk of rattling.

  Further, since one brake plate is in contact with both wheels simultaneously, the locking operation may be the same as that for a single wheel, and the safety of the lock is high.

According to the second aspect of the present invention, two rods come out in parallel to a brake cam that is pivotally supported on the bracket to operate the brake plate, and the tip thereof forms a rectangular ring in the lateral direction. The gist of the present invention is to project a pedal formed as a ring body to be a large-diameter portion.

According to the second 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 it is folded with an excessive force. 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 mobile scaffold device of the present invention can move with a small force even during movement, and also has good stability in turning during movement, so the stability of the mobile scaffold is dramatically improved. To do.

  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 and 2 show an example of the caster 14, and the same reference numerals are given to the same components as those in FIGS. 5 and 6 showing the conventional example.

  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.

  Although not shown, as shown in FIGS. 5 and 6, a female screw ring 16 with a handle 16 a is screwed onto the vertical axis 15, and the lower end of the pipe contacts the female screw ring 16 in the attached state. In order to make contact, the protruding length of the leg ring can be adjusted by rotating the female screw ring 16 and moving its position up and down.

A circular mounting plate 18 above the casters 14 is fixed to the lower end of the vertical axis 15. The circular mounting plate 18 covers an upper bearing 37 to be described later from above and from the side.

  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 vertically above 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 20 b that is fitted to the outer periphery of the wheel part 20 a. The two wheels 20 having the same diameter constituted by the wheel portion 20a and the tire 20b are held coaxially by the axle 34, and the wheels 20 rotate independently of each other. Is possible.

  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 the brake plates 23 are vertically supported by engaging both sides of the brackets 22 on both sides. 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.

  In the present invention, the lower locking piece 27 is in contact with the two wheels 20 and 20 at the same time.

  A horizontal shaft 24 is supported outside the brake plate 23 so as to connect the brackets 22 on both sides, and a 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. 3, the pedal 41 has two rods 42 protruding in parallel, and the tip of the pedal 41 in the lateral direction forms a rectangular ring. It was formed as a ring body to be a rectangular enlarged diameter portion 43.

  The brake plate 23 having such a structure is vertically mounted so that the notches on both sides thereof are engaged with the brackets 22 on both sides, and in the non-brake state, the upper arc-shaped upper locking piece 26 is the upper part of the caster. The lower mounting piece 27 is in light contact with the wheels 20 and 20, and a part of the brake cam 25 is in contact with the central convex portion of the brake plate 23.

  Thus, in the mobile scaffold device of the present invention, the wheels 20 and 20 of the casters are constituted by 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.

Table 1 below shows the results of tests conducted to confirm the effects of the present invention. Compared to a single wheel (single type) conventional product, it can move with a small force during linear movement and turning. Was proved.

  Further, when applying the brake, the pedal 41 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.

1 shows one embodiment of a mobile scaffold device of the present invention, and is a front view in which a caster portion is partially cut away. 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 of the mobile scaffold apparatus 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 21 ... York 21a ... Side wall 21b ... Top plate 22 ... Bracket 23 ... Brake plate 24 ... Horizontal shaft 25 ... Brake cam 26 ... Upper locking piece 27 ... Lower engagement Stop piece 28 ... Rod 32 ... Bush 33 ... Bearing 34 ... Axle 35a, 35b ... Nut 36 ... Turning shaft 37 ... Upper bearing 38 ... Lower bearing 37a, 38a ... Outer ring 37b, 38b ... Inner ring 37c, 38c ... Bearing 39 ... First Washer 40 ... Second washer 41 ... Pedal 42 ... Rod 43 ... Diameter expansion part

Claims (2)

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 yokes for supporting the wheels of the casters, which are rotatable independently of each other, and the axles for rotating the wheels, have a pair of side walls opposed to both surfaces of the wheels, and the pair of side walls are the wheels. A top plate connected to the upper part of the top plate is integrally formed, and a lower bearing that is housed in a recess of the top plate and an upper bearing provided thereabove are connected to the inner ring that can rotate integrally with the pivot shaft, and to the inner ring. The brake is formed of an outer ring that can rotate integrally with the yoke via a bracket, the pivot shaft extends to the lower end of the vertical axis with a screw formed on the outer periphery, and the yoke is formed into an arcuate shape via the bracket A lower locking piece that is in contact with the outer peripheral surface of the wheel formed in the lower part of the brake plate is in contact with the two wheels at the same time; A mobile scaffold device comprising a circular mounting plate for covering the upper bearing from above and from the side, and an upper locking piece of the brake plate abutting on the circular mounting plate . Two rods come out in parallel to the brake cam that pivotally supports the bracket as a brake plate actuating element, and the tip of the brake cam is a rectangular body that forms a rectangular ring in the lateral direction. The mobile scaffold device according to claim 1, wherein the formed pedal projects.

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