JPH0642163A - Folding scaffold - Google Patents

Abstract

PURPOSE:To provide a scaffold for indoor use at construction site, which is not likely to go in breakage and which can be folded small very easily. CONSTITUTION:A pair of upper diagonal frame, 1a and another pair of similar members 1b, 1b are over and below installed, which are rotated horizontally while the middle part is borne. A main leg 13 raised upright is fixed to each end of the diagonal memberla, 1b. On the upper diagonal members la, la, two working boards 31, 31 are mount,ed whi.ch are coupled by hinge to be opened downward. The angle of opening of two diaginal members 1, 1 which constitute a pair is lessened, and main legs 13, 13 secured to different diagonal members are approached to one another. The two working boards 31, 31 are shut and folded so as to be located on the left and right of the diagonal members 1, 1 which are shut approx. overlapping. Therein risk of breakage is lesser because the main legs 13 and working boards 31 are so copnfigured as not requiring use of any metal fixture for securing, and also it is practicable for a sole operator to fold up this scaffold easily. The constitution in which the boards 31, 31 are located on the left and right of the shut diagonals 1, 1, enables the scaffold to be folded up small.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work scaffold used at a construction site or the like, and more particularly to a work scaffold that can be folded small at the time of loading / unloading and storage.

[0002]

2. Description of the Related Art In the case of constructing walls and ceilings indoors at a construction site, a plurality of stepladders are arranged at intervals, and boards are placed on the stepladders to form a scaffold. With such scaffolding, the width of the scaffolding is determined by the board width, and the work must be performed on a narrow scaffolding. In particular, in recent years, the demand for safety is increasing in construction and civil engineering sites, and together with the aging of workers, the development of safer scaffolds has been desired. In addition, it has been desired to streamline work using a wide work scaffold. On the other hand, work scaffolds with legs on all sides have been developed, and most of them are foldable work scaffolds in consideration of the convenience of loading / unloading and storage.

[0003] As such a folding work scaffold,
It has been developed that the legs are attached to all four sides of the worktable by hinges like a folding table, and the legs are folded along the worktable. Further, as shown in FIG. 22, the workbench a is composed of two hinged plates, and similarly the hinged legs b are attached to the workbench a.
The legs b facing each other are pulled together, and the workbench a is raised so as to be folded up.

[0004]

The conventional folding type workbench described above has the following problems. In the work scaffold, the load concentrates on the legs. The fact that this leg is attached by a hinge means that the connection between the workbench and the leg is not strong, this hinge connection part is likely to be damaged, and this connection part cannot be used as a scaffolding. It will be a big damage. For this reason, it is adopted to attach the legs to the workbench by making the mounting hardware that hinges the workbench and the legs large with high strength, but the weight is extremely large and the labor for carrying in and out is large. It was. In addition, even if the legs were folded, the mounting hardware would overhang, so a large space was required for storage. If you fold the hinged legs along the workbench like a table, you have to turn the scaffold upside down to fold it, and lift up a heavy scaffold and return it. It requires multiple workers and is difficult for older workers. In the case of the scaffolding as shown in FIG. 22, the strength of the hinged portion is a problem, and the workbench a rises a large amount upward, so that the height in the folded state becomes extremely high. In this case, the moving work at the time of loading and unloading is extremely unstable, and there is a risk of falling, and a large space is required for storage.

The present invention has been made to solve the above problems, and an object thereof is to provide a work scaffold which is less likely to be damaged and is small and foldable.

[0006]

A foldable work scaffold according to the present invention uses a pair of diagonal crosspieces having an intermediate portion pivotally supported and horizontally turning, and opening and closing of the diagonal crosspieces. It can be folded by using it. The two pairs of the diagonal crosspieces are arranged vertically, and the main leg standing upright almost vertically is fixed to each end of the diagonal crosspiece and supported by four main legs. Mount the two work benches on the upper diagonal rail. The two workbenches are hinged so that they can be closed downward. The diagonal crosspieces to be paired are rotated about the axis to reduce the opening angle. As a result, the main legs fixed to the other diagonal crosspieces are brought close to each other, and the pair of diagonal crosspieces are closed so as to substantially overlap each other. The two work benches on the diagonal crosspiece are closed so as to rotate about the hinge, and are positioned on the left and right of the closed diagonal crosspiece.

In some cases, the main leg has a tubular shape, and the telescopic leg is slidably accommodated inside the main leg to make the length of the leg extendable.
A stopper is attached to the side of the main leg, and the stretchable leg extended by this stopper is fixed. A caster having two wheels is attached to the lower end of the telescopic leg.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on an embodiment shown in the drawings. In the figure, reference numeral 1 is a diagonal crosspiece, and a pair of diagonal crosspieces 1 and 1 constitutes one set. These two pairs of diagonal bars 1
Are arranged above and below, and an intermediate portion is axially supported above and below the shaft 2. As a result, each diagonal beam 1 can be horizontally rotated about the shaft 2 as a fulcrum. The pair of upper diagonal crosspieces 1a and 1a each have a C channel member 3 axially fixed to a shaft 2 and the shaft 2 on the outer surface of the flanges 3a and 3a of the C channel member 3 as shown in FIGS. It is constituted by square pipes 4 and 4 which are welded in a point-symmetrical manner as points alternately and which extend in opposite directions. The C channel members 3, 3 of the diagonal crosspieces 1a, 1a are vertically symmetrically arranged and axially fixed, and the square pipes 4, 4 are located at the same height. A plurality of coil springs 5 are attached to the side surface of one diagonal rail 1a toward the side surface of the other diagonal rail 1a. With such diagonal crosspieces 1a and 1a, the square pipes 4 and 4 of both diagonal crosspieces 1a and 1a can be housed on the right and left sides of the C channel member 3 and 3 as shown in FIG.

A diagonal beam 1b having an intermediate portion axially supported below the shaft 2
1b is shown in FIGS. One of the two diagonal crosspieces 1b and 1b has a square pipe 7 that is pivotally supported by a shaft 2,
The square pipe 7 is composed of C channels 8 8 which are welded in a point-symmetrical manner with the axis 2 as a point on the outer surface of the square pipe 7. The other diagonal beam 1b has upper and lower flanges 9 and 9 welded to its tip.
And C channel material 8.8 welded to it. As shown in FIG. 9, the C-channel members 8 are formed such that when the diagonal bars 1b and 1b are closed, the grooves face each other.

As shown in FIGS. 10 and 11, a lock pipe 10 is slidably fitted on the outer periphery of the shaft 2, and a coil spring is interposed between the lock pipe 10 and the square pipe 7 of the lower diagonal beam 1b. It is constantly pushed upward by 10a. At the upper and lower intermediate portions of the lock pipe 10, claws 11, 11 whose tip is pushed upward by a spring, are projected to the left and right. A push-down member 12 is laterally provided so as to project slightly below the claw 11. When the push-down member 12 is pushed downward, the lock pipe 10 is lowered together with the claw 11.

A main leg 13 which is erected substantially vertically is fixed to each end of the upper and lower diagonal bars 1a and 1b by welding. That is, the diagonal rail 1a is fixed above the main leg 13, the diagonal rail 1b is fixed below the main leg 13, and the four main legs 13 are attached. Four main legs 13
Can be moved closer or farther by changing the opening angle of the upper and lower diagonal bars 1a and 1b.

Each main leg 13 has a cylindrical shape, and a cylindrical telescopic leg 14 is slidably and rotatably arranged inside. The telescopic leg 14 has a plurality of holes 15 vertically spaced apart at appropriate intervals. A handle 16 is rotatably attached to a bracket 18 by a horizontal shaft 17 on the side surfaces of the upper and lower intermediate portions of each main leg 13. The end surface of the handle 16 facing the main leg 13 is in contact with the side surface of the main leg 13 so that the handle 16 rotates downward, but does not rotate above horizontal. Bracket 18
A pin 19 bent into a mountain shape is rotatably attached to the shaft,
The spring 20 biases the tip toward the main leg 13.
The tip of the pin 19 is axially fixed so as to be inclined downward, and is prevented from rotating upward by a certain degree or more. The main leg 13 has a hole 21 corresponding to the pin 19, and the tip of the pin 19 can be hooked in the hole 15 of the telescopic leg 14 through the hole 21.

Inside the lower end of the main leg 13, a rattling prevention portion 22 having a large wall thickness is formed over the half of the inner circumference. In the embodiment, the lower half of the main leg 13 in the circumferential direction is crushed, and the thickness is increased along the inside of the other uncrushed portion. At the lower end of each telescopic leg 14, a caster 23 having two wheels arranged in parallel on the left and right is attached. The casters 23 are provided with stoppers for stopping the rotation of the wheels.

The adjacent main legs 13 and 13 have an intermediate rail 24.
Thus, the telescopic legs 14 and 14 are connected by the lower crosspiece 25. As shown in FIG. 14, two split bars 27, 27 are connected by a vertical pin 26 so that the middle bars of the middle bars 24 and the lower bars 25 can be bent horizontally. Both ends of the intermediate rail 24 and the lower rail 25 are welded to the main leg 13 and the telescopic leg 14, respectively. The intermediate rail 24 is also the lower rail 2.
5 also has an upside-down groove-like locking member 28 attached to one of the split bars 27 by a pin 29 so as to project toward the other. The tip of the locking tool 28 can be lifted upward by a pin 29. When the intermediate rail 24 and the lower rail 25 are extended, the other split rail 27 comes into contact with the tapered portion 30 of the locking tool 28 to lift the tip. As it is extended as it is, as shown in FIG. 15, the split bar 27 is fitted into the inverted groove-shaped locking tool 28 and fixed in a straight line.

The lower crosspiece 25 is formed by retracting the telescopic leg 14 to the main leg 1.
When it fits in 3 as much as possible, the lower diagonal bars 1b and 1b
It is located at the same height as. When the opening angle of the diagonal crosspieces 1 and 1 is reduced, as shown in FIG. 8, the split crosspieces 27 and 27 of the lower crosspiece 25 are housed in the grooves of the C channel members 8 and 8 of the diagonal crosspieces 1b and 1b facing each other. To be done.

Two work benches 31, 31 are mounted on the upper diagonal crosspieces 1a, 1a. Two workbench 3
The pins 1 and 31 are hinge-coupled at a plurality of points by a pin 32, and can be closed downward. The work table 31 has a rectangular frame, a plurality of crosspieces, and a metal lath. The bracket 33 attached to the intermediate portion of the abutting sides of the two worktables 31 and the arm links 34 and 34 between the lower surfaces of the diagonal bars 1a and 1a above the pins 32 and 35 are attached to the shafts. I support it. By increasing the opening angle of the diagonal crosspieces 1a and 1a, as shown in FIG.
As shown in FIG.
At the same time, the connecting portion of the worktables 31 and 31 is pulled down, and the worktables 31 and 31 are opened and kept horizontal. By reducing the opening angle of the diagonal crosspieces 1a and 1a, as shown in FIG.
As shown in FIG.
By pushing up, the work tables 31 and 31 are automatically closed. The claws 11 and 11 of the lock pipe 10 are provided in the middle of the sides of the work tables 31 and 31 which are closed downward.
Hook portions 39 capable of hooking are attached respectively.

Pins 36 are projected substantially horizontally at the portions corresponding to the four corners of the work benches 31 and 31 which are connected to each other. The upper end of the main landing gear 13 has corresponding holes 36.
a is open. Open the diagonal beam 1.1 to work table 31
・ When 31 is opened upwards, as shown in FIG.
Is fitted into the hole 36a of the main landing gear 13, and the work table 31.3
1 does not rise. In addition, as shown in FIG.
A spacer portion 37 formed of a square pipe is projected on the side surface of the reference numeral 3, and a receiving metal fitting 38 is provided on the corresponding diagonal crosspiece 1b. When the diagonal bars 1 and 1 are folded with a small opening angle, the spacer portion 37 abuts the receiving metal fitting 38, and a certain clearance can be secured between the diagonal bars 1 and 1. This clearance prevents the members from being deformed by the weight when stacking a large number of folded work scaffolds.

Next, the usage state of the work scaffolding as described above will be described. First, when opening the folded work scaffold, the push-down member 12 of the lock pipe 10 is pushed down by a leg or the like to remove the nail 1.
Release the hooking between the hook 11 and the hooking portion 39 of the workbench 31. Main landing gear 13 closed and close
Hold 13 and open it to the left and right to increase the opening angle of diagonal crosspieces 1 and 1. At this time, since the coil springs 5 interposed between the upper diagonal bars 1a and 1a push them apart from each other, the diagonal bars 1.1 can be easily opened. Further, as described above, with the opening of the diagonal crosspieces 1a and 1a, the arm links 34 and 34 pull down the connecting portions of the worktables 31 and 31, so that the worktables 31 and 31 are opened horizontally. The intermediate rail 24 and the lower rail 2 whose connecting portions were bent
When 5 becomes almost straight, the locking tool 28 is fitted to the other split bar 27 as described above, and the linked split bars 27, 27 are connected.
Is fixed in a straight line. At this time, as described above, the workbench 3
The pins 36 at the four corners of 1.31 fit into the holes 36a of the main leg 13 to prevent the workbench from rising. Work table 31.3
The four corners of No. 1 are placed on the main leg 13 which is open in all directions, and serve as a stable work scaffold having a wide work area.

Next, the case where the height of the workbench 31 is increased and a higher place is constructed will be described. Left and right main landing gear 1
3 ・ 13 or handle 16 ・ 16 of main landing gear 13 ・ 13
Grip the main leg 13.1 with your feet lightly placed on the lower crosspiece 25.
Lift 3. Since the telescopic legs 14 and 14 are pressed together with the lower crosspiece 25, only the main legs 13 and 13 are raised upward, and as a result, the total length of the legs is extended. The pin 19 at the bottom of the handle 16 is urged by a spring 20 toward a hole 21 formed in the main leg 13, and is fitted into an appropriate hole 15 of the telescopic leg 14 located in this hole 21 to allow the main leg 13
Does not go down. Since the tip of the pin 19 is inclined downward, if the main leg 13 is lifted to further extend, the pin 19 easily comes out of the hole 15 and does not hinder the extension. Next, turn to the opposite side of the work scaffold, hold the handles 16 and 16 and similarly lift the main legs 13 and 13 so that the height of the work table 31 becomes horizontal.

A description will be given of prevention of rattling when the telescopic legs 14 are extended. A rattling prevention portion 22 is provided at the lower end of the main leg 13 toward the inside, and the rattling prevention portion 22 presses the telescopic leg 14 against the inner surface on the opposite side of the main leg 13 to prevent the telescopic leg 14 and the main leg 13 from colliding. It is designed to prevent rattling due to the difference in diameter. Also, as shown in FIG. 13, the pin 19 of the main leg 13 is inclined downward,
The lower edge of the hole 15 of the telescopic leg 14 hits the lower surface of the pin 19 and the telescopic leg 14 is pulled toward the pin 19. As a result, the telescopic legs 14 are attracted to the inner peripheral surface of the main leg 13, and this contact prevents rattling. Since the rattling of the main leg 13 and the telescopic legs 14 is eliminated in this manner, the scaffolding becomes stable even when the telescopic legs 14 are greatly extended, and a working scaffold higher than the conventional one can be obtained.

As yet another rattling prevention measure, FIG.
A rattling prevention tool 40 as shown in 21 can be adopted.
The rattling prevention tool 40 is attached near the main leg 13 of the intermediate rail 24, and includes a pressing tool 41 urged in a direction away from the main leg 13 by a spring 42 and a circular cam 43 axially locked at a position displaced from the center. Has become Main landing gear 13
A hole 44 corresponding to the pressing tool 41 is formed on the side surface of the. A lever 45 is attached to the cam 43 so that it can rotate integrally.
Is fixed. If the lever 45 is raised as shown in FIG. 20, the cam 43 does not hit the pressing tool 41. Figure 2
When the lever 45 is lowered as in 1, the portion of the cam 43 away from the shaft hits the pressing tool 41. Pressing tool 41
Is pushed toward the main landing gear 13 against the force of the spring 42,
It is pressed against the side surface of the telescopic leg 14 through the hole 44. This force pushes the telescopic leg 14 against the inner peripheral surface on the opposite side of the main leg 13,
The rattling of the main leg 13 and the telescopic leg 14 is prevented.

The folding work of the work scaffolding as described above will be described. When the telescopic legs 14 are extended to increase the height of the work table 31, a finger is put on a portion of the pin 19 which is projected below the handle 16 to resist the force of the spring 20.
The tip of 9 is removed from the hole 15 of the telescopic leg 14. By this, the telescopic legs 14 can be easily retracted and stored in the main legs 13, and the height of the workbench 31 can be lowered. Next is the intermediate beam 24
And the side of the lower crosspiece 25 where the locking tool 28 is pinned is pressed to lift the tip. In this state, the left and right main landing gears 13, 13
Are pulled toward each other, and the intermediate rail 24 and the lower rail 25 are slightly bent at the connecting portion. The intermediate rail 24 and the lower rail 25 are bent in the same manner around the opposite side. Main landing gear 1
When 3 and 13 are brought close to each other, the opening angle of the diagonal crosspiece 1 and 1 becomes small, and the main legs 13 and 13 on the opposite side also come close to each other. As the opening angle of the diagonal beam 1.1 decreases, the worktables 31 close downward as described above. When the worktables 31 and 31 are closed to some extent, the claws 11 and 11 of the lock pipe 10 are changed to the worktables 3 and 3.
1 is hooked on the hooking portion 39, 39 of the work table 31.3
The opening of 1 is locked. Moreover, since the worktables 31 and 31 can press the diagonal bars 1 and 1 from the left and right,
The 1 never opens.

[0022]

Since the present invention has the above-mentioned structure, the following effects can be obtained. The main landing gear is fixed to the diagonal crosspiece, and the workbench only rests on the main landing gear when it is opened, so the connection of the most concentrated load leg and workbench is extremely simple, and damage is possible. It becomes a work scaffold with extremely low strength and high strength. Since the metal fittings that hinge the legs and workbench are not used,
The weight is light and the work of loading and unloading is extremely easy. In addition, there is no large protrusion when folded, the whole can be folded thin, and a small space for storage is sufficient. Assembling and folding work can be done by simply changing the opening angle of the diagonal crosspieces by moving the main legs apart or close to each other. This means that it is not necessary to turn over once and perform the folding work, and the assembling / folding work can be easily performed by one person or even if the worker is old. Since the opening angle of the diagonal crosspiece is small and the two worktables are closed so as to be positioned on the left and right sides of the diagonal crosspiece, the overall height in the folded state is sufficiently low. Therefore, it is unlikely to fall down when moving in and out, and does not require a large space for storage. The height of the workbench can be adjusted to an arbitrary height by providing an elastic leg inside the main leg and extending the elastic leg to an arbitrary height. By adopting a caster having two wheels, the width of the caster supporting the scaffold becomes wider, and stable movement is possible.

[Brief description of drawings]

FIG. 1 is a perspective view of a work scaffold according to the present invention in an assembled state.

FIG. 2 is a perspective view of a work scaffold in a folded state.

FIG. 3 is a perspective view illustrating opening of a diagonal crosspiece.

FIG. 4 is a plan view illustrating the opening of an upper diagonal rail.

FIG. 5 is a plan view showing a state in which an upper diagonal crosspiece is closed.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a plan view illustrating the opening of a lower diagonal beam.

FIG. 8 is a plan view showing a state in which a lower diagonal beam is closed.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is a side view showing a state in which the workbench is closed and hooked on the claw of the lock pipe.

FIG. 11 is a side view showing a state in which the workbench is released from being caught by the nail.

FIG. 12 is a perspective view showing a state where the telescopic leg is extended and fixed by a pin.

FIG. 13 is a partial cross-sectional view of a main leg.

FIG. 14 is a perspective view of a crosspiece bent at a connecting portion.

FIG. 15 is a perspective view showing a state where the crosspiece is straightened.

FIG. 16 is a partial side view showing a state in which the workbench is opened and horizontal.

FIG. 17 is a partial side view showing a state where the workbench is closed and positioned on the left and right of the diagonal crosspiece.

FIG. 18 is a perspective view showing a state where a corner of a workbench is fixed to a main leg.

FIG. 19 is a perspective view of a spacer portion and a receiving fitting.

FIG. 20 is a side view of the rattling prevention device.

FIG. 21 is a side view showing a state where the telescopic leg is pushed by the rattling prevention tool.

FIG. 22 is a perspective view of a conventional folding work scaffold.

[Explanation of symbols]

 1 Diagonal beam 2 Shaft 10 Lock pipe 11 Claw 13 Main leg 14 Telescopic leg 16 Handle 19 pin 23 Caster 24 Intermediate beam 25 Lower beam 28 Locking tool 31 Work table 32 pin 34 Arm link 35 pin 37 Spacer 38 Receiving metal fitting 39 Hook 40 Anti-rattler

Claims (3)

[Claims] 1. A pair of diagonal crosspieces, each of which is pivoted horizontally with an intermediate portion pivotally supported, is arranged vertically, and a main leg standing substantially vertically is fixed to each end of the diagonal crosspieces. Two work benches, which are hinged and can be closed downward, are attached on the upper diagonal rail, and the opening angle of the pair of diagonal rails is made smaller and fixed to a separate diagonal rail. A collapsible work scaffold that allows the main legs to come close to each other and that the two work benches be closed so that they can be folded so that they are positioned on the left and right sides of the diagonal crosspieces that are closed so that they almost overlap. 2. Each main leg has a tubular shape, and an extendable leg is slidably arranged inside the main leg, and a stretched length of the extendable leg can be fixed by a stopper provided on a side surface of the main leg. The foldable work scaffold according to claim 1, wherein the work scaffold is foldable. 3. The foldable work scaffold according to claim 2, wherein a caster having two wheels arranged side by side is attached to a lower end portion of each telescopic leg.