JP3453196B2 - Work scaffold - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work scaffold for use at a relatively high place such as interior finishing of a ceiling, wiring in the ceiling, and piping work at a building construction site or the like.

[0002]

2. Description of the Related Art In the case of building a building, interior construction and wiring work are carried out after the skeleton is constructed. In that case, in finishing work in a relatively high place such as the ceiling,
Working scaffolds are used.

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

It is provided with a stage section for performing work and a foldable leg body for the stage section, and when the pedestal is in use, the leg body is expanded to stand upright at the use position, and when not in use, it is folded to be in a stored state. According to this structure, the scaffolding member and the scaffolding plate are easy to use as compared with the case where they are separate bodies.

[0005]

However, in this conventional device, since the legs can be folded and stored when not in use, the rigidity of the legs during use is insufficient, and therefore the device is not used. There was a fatal drawback of having instability in the state.

Therefore, it is conceivable to provide a leg reinforcing member for connecting the lower part of the leg and the back surface of the central portion of the stage portion in a bracing manner to reinforce the leg in a use state. In that case, the leg reinforcing member is in a bracing state. It is necessary to be able to bend and extend between the folded state along the back surface of the stage section, and at the joint section to be bent and extended, the leg body becomes unstable unless the leg reinforcement can be securely locked in that extended state. There is a problem that a lock mechanism is required, the structure becomes complicated and the cost becomes high.

In view of the above-mentioned conventional problems, the present invention allows the legs to be folded when not in use, and when used, the legs can be securely fixed in the expanded state to allow stable work on the stage. An object is to propose a work scaffold that can be performed and can be manufactured at a low cost with a simple configuration.

[0008]

In order to achieve the above object, the present invention provides a stage section 1 for performing work, an expanded state, and a back surface of the stage section 1 as indicated by reference numerals in the drawings. Between the leg 12 that is rotatable between the folded state and the state in which the lower side of the leg 12 and the rear surface of the central portion of the stage portion 1 are connected in a bracing manner and the folded state along the rear surface of the stage portion 1. In a work scaffold provided with a leg reinforcement 18 that can be bent and stretched at an intermediate joint portion 21, the joint portion 21 is pivotally supported by a connecting shaft 24 and can be separated from each other so as to be rotatable in the bending and stretching directions. A means 25 that is composed of the first lock member 22 and the second lock member 23 that are overlapped with each other and that urges the first and second lock members 22 and 23 in a direction in which they overlap each other.
Is provided to form a protrusion 26 and a recess groove 27 which are fitted and engaged with each other on the overlapping surfaces of the first lock member 22 and the second lock member 23 , and the center line of the protrusion 26 and the recess groove 27 is the connecting shaft 24.
The structure is formed so as to pass through the axis of the.

[0009]

In the second aspect, the ridge 26 and the concave groove 27 are provided.
The configuration of claim 1 is adopted in which the cross-sectional shape of is a trapezoid.

In the third aspect , the first lock member 22
2. The second lock members 23 are disposed on both sides of the first lock member 22, and the protrusions 26 and the concave grooves 27 are formed on both side surfaces of the first lock member 22 and the overlapping surface of the second lock member 23, respectively. The configuration described in 2 is adopted.

In the fourth aspect, the first lock member 22
Second locking members 23 are disposed on both sides of the first locking member 22 and the second locking member 23 on one side, and the protrusion 26 is formed on the overlapping surface.
The concave groove 27 is formed, and the overlapping surface on the other side is a flat surface.

In the fifth aspect, the first lock member 22
The stopper 28, which comes into contact with the other lock member and prevents rotation in the contact direction, is fixed to one of the ends of the second lock member 23 and the second lock member 23. is there.

[0014]

According to the first aspect of the present invention, the leg reinforcing member 18 extends at the joint portion 21 when the leg body 12 is deployed and used.
Since the lower part of the leg 12 functions as a brace connecting the central part of the back surface of the stage part 1, the leg 12 can be firmly fixed to form a stable work scaffold, and the leg 12 can be reinforced in the folded state. The material 18 can also be bent at the joint portion 21 and folded along the back surface of the stage portion 1, so that the work scaffold can be folded compactly. Moreover,
The joint portion 21 is rotatably supported at its intermediate portion by a connecting shaft 24 and is urged so as to overlap each other.
Since the protrusions 26 and the recessed grooves 27 which are fitted and engaged with each other are formed on the overlapping surfaces of the lock members 22 and 23 of FIG.
And the concave groove 27 are engaged and locked in that state, the leg 12
Can be stably fixed, and has a simple structure including the first and second lock members 22 and 23, the pivot shaft 24, and the biasing means 25 each having a simple shape, and can be inexpensively configured.

Further, according to the present invention , the ridge 26 and the concave groove 27 are provided.
Since the center line is formed so as to pass through the axis of the connecting shaft 24, the ridge 26 and the concave groove 27 are fitted and engaged both when the joint portion 21 is in the extended state and when the joint portion is rotated by 180 °. Since the legs 12 are locked by being locked, not only can the leg 12 be fixed in the expanded state, but it can be fixed in the folded state and self-maintained in that state.

According to the second aspect of the present invention, since the cross-sectional shapes of the ridge 26 and the concave groove 27 are trapezoidal, the inclined surfaces on both sides engage in a wedge shape to form a gap in the engaging portions. The leg 12 can be more stably and firmly fixed by engaging without causing any rattling. When the first and second lock members 22 and 23 are strongly rotated, the first
Since the second lock members 22 and 23 ride up along the inclined surface and are separated from each other against the biasing force, and the engagement is released, the engagement and the engagement release of the joint portion 21 without troublesome operation. It can be performed.

According to the third and fourth aspects of the present invention, the second lock members 23 are arranged on both sides of the first lock member 22, and the first lock member 22 is sandwiched by the second lock members 23. Therefore, it is possible to secure the necessary rigidity even in the joint portion 21 in which the two members 22 and 23 are connected so as to be separated from each other, and the leg reinforcing member 18 is prevented from bending in the joint portion 21 in an unexpected direction. It can be prevented and stability can be improved. Particularly, according to the fourth aspect, since the protrusions 26 and the concave grooves 27 are engaged with each other on both sides of the first lock member 22, the engagement area is large and the engagement depth is made shallow to engage. Even if the engagement / disengagement operation is easily performed, a stable locked state can be obtained.

According to the fifth aspect of the present invention, the stopper for preventing one end of one of the first lock member 22 and the second lock member 23 from contacting the other lock member to prevent rotation in the contact direction. Since 28 is fixed, when the leg reinforcement 18 is changed from the folded state to the extended state, the first and second joint portions 21 are connected to each other.
Further, it is possible to reliably prevent the lock members 22 and 23 from further rotating beyond the extended state, and safety is improved.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the work scaffold of the present invention will be described below with reference to FIGS.

1 to 4, reference numeral 1 denotes a stage portion on which an operator rides and works on a ceiling or the like, and is divided into a pair of left and right stages 2a and 2b at a central position in the longitudinal direction. The stages 2a and 2b are in a developed state in which a flat stage portion 1 is configured by a pivot portion 3 arranged on their opposing edges and a folded state in which the lower surfaces of the stages 2a and 2b are folded so as to face each other. It is connected so that it can be opened and closed. Each of the stages 2a and 2b is constructed by combining appropriate aluminum mold members so as to have a required bending strength and rigidity on which a person can ride and work.

The pivot 3 is formed so that connecting brackets 4a and 4b are fixed to the front and rear side surfaces of the opposite ends of the stages 2a and 2b, respectively, and the lower ends of the opposite edges of the connecting brackets 4a and 4b overlap each other. The pivotal support portions 5a and 5b are rotatably connected by one pivotal support shaft 6 extending in the front-rear direction along the opposite ends of the stages 2a and 2b. When the connecting brackets 4a and 4b are in the deployed state, the opposing edges 7a and 7b of the connecting brackets 4a and 4b are in contact with each other to keep the stages 2a and 2b in the deployed state and the load acting on the stages 2a and 2b. Is received by the contact of these opposed edges 7a and 7b. Further, a cap nut 8 is screwed and fixed to both ends of the pivot shaft 6, and is engaged with an outer surface of the outer pivot portion 8b via a washer 9. As a result, when a load acts on the stage unit 1, the bending moment causes the connecting bracket 4 to move.
The lower part of a, 4b bends outward, and as a result, a force acts to peel off the connecting brackets 4a, 4b due to the load, or abutting portions of the opposite end edges 7a, 7b of the connecting brackets 4a, 4b. Even if a large load acts on the stage unit 1,
The stage portion 1 is prevented from inclining so that the opposite ends of the stages 2a and 2b fall downward, and the pivot portion 3 is prevented from being damaged. A locking lock 10a and a hook 10b for locking the locking lock 10a are attached to the connecting brackets 4a and 4b, and the connecting brackets 4a and 4b are connected so as not to spread when the stages 2a and 2b are in an expanded state.
The stages 2a and 2b are prevented from unintentionally rotating in the folding direction and lifting the central portion of the stage unit 1.

On the left and right ends of the stage unit 1, that is, on the rear side of the left and right outer ends of the stages 2a and 2b, the leg support 11 is provided.
Is provided, and an upper connecting member 13 that connects the upper ends of the pair of front and rear legs 12 is rotatably supported.
The leg body pivot portion 11 has a pivot shaft (not shown) laterally mounted between the mounting plates 14 and 14 fixed to the front and rear side surfaces of the left and right outer ends of the stages 2a and 2b, and is connected to the pivot shaft by an upper portion. The part 13 is rotatably fitted. The lower ends of the pair of front and rear legs 12 are connected to each other by a lower connecting member 15, and the height adjusting legs 1 are respectively attached to the lower ends of the legs 12.
6 is mounted so as to be able to move in and out.

A mounting bracket 17 is fixed by welding or the like to the back surface of the central portion in the front-rear direction near the opposite ends of the stages 2a and 2b. The central portion of the mounting bracket 17 and the lower connecting member 15 is a leg reinforcing member 18. It is connected. Leg reinforcement 1
8, an upper reinforcing member 19 having an upper end rotatably connected to a mounting bracket 17 and a lower end connected to a joint portion 21, and a lower end rotatably connected to a central portion of a lower connecting member 15,
The upper end portion is composed of a lower reinforcing member 20 joined to the joint portion 21. The lower reinforcing member 20 is composed of a pair of members 20a that are arranged in parallel in the front-rear direction at appropriate intervals.

The joint portion 21 includes an upper reinforcing member 19 and a lower reinforcing member 20, which are in a straight line when they are in use and between the pair of members 20a, 20a of the lower reinforcing member 20.
It is connected so that it can be bent and stretched between the folded state and the. In this joint portion 21, as shown in FIG.
The first integrally fixed to the lower end of the upper reinforcing member 19 by welding or the like
Locking member 22 and pair of lower reinforcing member 20
Second lock members 23 and 23 integrally fixed to the upper ends of a and 20a by welding or the like overlap in the front-rear direction, and an intermediate portion thereof is pivotally supported by a connecting shaft 24 so as to be rotatable in the bending and extending directions. ing. The second lock members 23, 23 are arranged on both sides of the first lock member 22 and have a pair of members 20a, 2
0a is slightly bent and the tip end thereof is opened in the front-rear direction so that it is overlapped with the first lock member 22 so as to be separated therefrom.

The connecting shaft 24 includes a first lock member 22 and a second lock member 22.
The lock member 23 is formed of a bolt that extends through the overlapping portion of the lock member 23 and is long, and a nut 24a is screwed to the tip of the bolt. The head 24b of the bolt 24 is the second one
A compression spring 25 is engaged between the lock member 23 and the other second lock member 23 and the nut 24a, and is attached so that the first lock member 22 and the second lock members 23, 23 overlap each other. It is energized.

The first locking member 22 and the second locking member 23
On the overlapping surface of the above, there are formed protrusions 26 and recessed grooves 27 having a trapezoidal cross-sectional shape that are fitted into each other so that their center lines pass through the axis of the connecting shaft 24. Further, a stopper 28 is fixed to the tip end portion of the second lock member 23 to prevent the tip end thereof from engaging with the upper side surface of the first lock member 22 and further rotating from the extended state.

The first lock member 22 and the second lock member 2
3 can be easily obtained by using a hollow mold member having a cross-sectional shape in which the protrusions 26 and the concave grooves 27 are formed as shown in the drawing, and only by cutting the hollow mold member to a predetermined length. Further, the hollow mold member can be easily manufactured by extrusion molding of an aluminum alloy. A solid mold material may be used instead of the hollow mold material, and in some cases, it can be manufactured by press working, sheet metal working, cutting work, or the like. As the material, a material that is lightweight and has wear resistance is preferable.

As shown in FIGS. 1 and 7, the legs 12 are folded on the back surfaces of the stages 2a and 2b at the substantially central positions of the left and right end surfaces of the stage portion 1, and the stages 2a and 2b are further pivotally attached to each other. A locking lock 29a and a hook 29b for locking the locking lock 29a for holding the state in the folded state are attached. Reference numeral 30 denotes leg rubbers which also serve as a cushioning body and are provided before and after the left and right end surfaces of the stage portion 1 as necessary.

According to the work scaffold configured as described above, when the legs 12 are folded on the lower surfaces of the stages 2a and 2b, as shown in FIG. By being bent and folded along the back surfaces of the stages 2a and 2b, and further by folding the stages 2a and 2b at the pivoting portion 3, the work scaffold can be compactly folded and stored, and the pivot shaft 6 can be used as a handle. It can be easily carried with the lever.

When carrying this work scaffold to a desired position and using it, after releasing the locking lock 29a, the stage 2a,
2b is turned downward and rotated around the pivot shaft 6 to expand the same.
As shown in, the stages 2a and 2b are brought into a developed state. In that state, as shown in FIG. 1, a locking lock 10 provided on the pivotally attached portion 3.
The stage part 1 is formed by hooking a on the hook 10b to prevent the stages 2a and 2b from unexpectedly rotating in the folding direction.

Next, the leg 12 is rotated around the leg pivot 11 as shown by the arrow a in FIG. This leg 12
With the rotation of the leg reinforcing member 18 from the folded state to the extended state and the leg 12 becomes vertical, the joint portion 21 causes the leg reinforcing member 18 to be in the extended state and maintained in that state. The legs 12 are fixed and held in a vertical state. Then, as shown in FIG. 1, it can be used as a work scaffold by standing it so that the stage part 1 is on top. In this use state, the leg reinforcement 18 held in the extended state functions as a brace that connects the lower portion of the leg 12 to the center of the back surface of the stage unit 1, so that the leg 12 can be firmly fixed and stable. A good work scaffold can be formed, and even if a load in the front, rear, left, and right directions acts on the stage 1, the legs 12
It is possible to provide a work scaffold which is prevented from rattling, and which can be folded compactly and yet is extremely stable.

The operation of the joint portion 21 of the leg reinforcing member 18 will be described in detail. In the extended state of the joint portion 21, the first and second joints are provided.
The leg stiffener 18 is locked in the extended state by engaging the protrusions 26 of the lock members 22 and 23 with the concave groove 27 and holding the state by the biasing force of the compression spring 25. The leg 12 is stably fixed at. Further, since the ridge 26 and the concave groove 27 are formed so as to pass through the axis of the connecting shaft 24, the ridge 26 and the concave groove are formed both when the joint portion 21 is in the extended state and when it is rotated by 180 °. Since 27 is engaged and locked, the leg 12 can be fixed not only in the expanded state but also in the folded state and self-holding.

Further, since the ridge 26 and the concave groove 27 have a trapezoidal cross-sectional shape, the inclined surfaces on both sides are engaged with each other in a wedge shape so that a gap is not formed between the engaging portions, so that rattling occurs. Engagement in the state where there is no, it is possible to more stably and firmly fix the legs. Moreover, when the leg body 12 is folded, the joint portion 21 of the leg reinforcing member 18 in the extended state is strongly pressed from below, and when the leg body 12 is expanded from the folded state, the lower connecting member 15 is strongly pulled up to make the first and second When the second lock members 22 and 23 are strongly rotated, as shown in FIG. 6, the first and second lock members 22 and 23 ride up along the inclined surface and resist the urging force of the compression spring 25. By separating them from each other, the engagement is automatically released, and the joint portion 21 can be engaged and disengaged without a troublesome operation.

Since the second lock members 23 are arranged on both sides of the first lock member 22 so that the first lock member 22 is sandwiched between the second lock members 23, both members can be separated from each other. The necessary rigidity can be ensured even in the joint portion 21 connected to the leg portion, and the leg reinforcing member 18 is connected to the joint portion 21.
Thus, it is possible to prevent refraction in an unexpected direction and improve stability. Further, since the ridge 26 and the groove 27 are engaged with each other on both sides of the first lock member 22, the engagement area is large and the engagement depth is shallow to facilitate the engagement / disengagement operation. Even if it is carried out, it is possible to obtain a stable locked state.

Further, since the stopper 28 that abuts the first lock member 22 and blocks the rotation in the abutting direction is fixed to the tip of the second lock member 23, the leg reinforcement 18 is extended from the folded state. When the state is set, the first and second joint portions 21
It is possible to reliably prevent the lock members 22 and 23 from further rotating beyond the extended state, and safety is improved.

Further, the joint portion 21 has a simple structure including the first and second lock members 22 and 23 having a simple shape, the connecting shaft 24 and the compression spring 25, and can be inexpensively constructed.

Further, in the present embodiment, when the work scaffold is in use, the bending moment generated by the load on the stage 1 is opposite to the end edges 7a, 7 of the connecting brackets 4a, 4b.
Since b is received by the pushing force against each other and there is a distance between the force point and the pivot point, sufficient strength and rigidity against bending moment can be easily secured, and one pivot point extending in the front-rear direction can be easily obtained. Since the pivotally supporting portions 8a and 8b are pivotally supported at both ends of the shaft 6, the deformation of the connecting brackets 4a and 4b can be surely prevented, the connecting brackets 4a and 4b bend outward, and the connecting brackets 4a and 4b are deformed. Or
There is no fear of breakage, and therefore even if the stage portion 1 is configured to be foldable, it is possible to secure sufficient strength and rigidity with respect to a large bending moment.

Next, when the work is completed and the work scaffold is folded into the accommodated state, the work scaffold is folded as shown in FIG. 7 from the state of FIG. 1 to the state of FIG. be able to.

In the above embodiment, the first lock member 22
Although the ridge 26 and the groove 27 are formed in the second lock members 23 on both sides, it goes without saying that they may be reversed.
Further, although the ridge 26 and the concave groove 27 have an example of a trapezoidal cross-sectional shape, they may be arcuate or rectangular.

In the above embodiment, the first lock member 22
Although the second lock member 23 is arranged on both sides of the first lock member 22 and the protrusions 26 and the groove 27 are engaged on both sides of the first lock member 22, the first lock member 22 and The ridge 26 and the concave groove 27 may be formed on the overlapping surface of the 2 lock member 23, and the overlapping surface on the other side may be a flat surface. Further, the lower reinforcing member 20 is composed of a single member 20a, a single second locking member 23 is coupled to the upper end of the lower reinforcing member 20, and the second locking member 23 is disposed only on one side of the first locking member 22. Good.

[0041]

According to the first aspect of the present invention, the leg reinforcing material extends at the joint portion in the use state where the leg body is deployed, and functions as a brace that connects the lower portion of the leg to the center of the back surface of the stage portion. Therefore, the legs can be firmly fixed to form a stable work scaffold, and when the legs are folded, the leg reinforcements are also bent at the joints and folded along the back surface of the stage so compact. Can be folded. In addition, the joint portion has a ridge that is pivotally supported at the intermediate portion by the connecting shaft and is engaged with the overlapping surfaces of the first and second lock members that are urged to overlap each other. Since the groove is formed, the protrusions of the first and second locking members and the groove are engaged with each other when the joint portion is extended, and locked in that state.
The 1st and 2nd shapes that can fix the legs stably and have a simple shape
It has a simple structure including the lock member, the pivot shaft, and the biasing means, and can exert a great effect such as being inexpensive.

Further, according to the present invention , since the ridge and the groove are formed so that their center lines pass through the axis of the connecting shaft, the joint portion is in the extended state and in the folded state rotated by 180 °. Since the ridge and the groove are fitted and locked by both, the leg can be fixed not only in the expanded state but also in the folded state and self-maintained in that state.

Further, according to the second aspect of the present invention, since the cross-sectional shape of the ridge and the groove is trapezoidal, the inclined surfaces on both sides are engaged in a wedge shape to form a gap in the engaging portions. Without engaging, there is no rattling, and the legs can be more stably and firmly fixed. Further, when the first and second lock members are strongly rotated, the first and second lock members ride up along the inclined surface and separate from each other against the biasing force, the engagement is released, and the troublesome Engagement and disengagement of the joint can be performed without any operation.

According to the third and fourth aspects of the invention, the second lock members are arranged on both sides of the first lock member so that the first lock member is sandwiched between the second lock members. Therefore, it is possible to secure the necessary rigidity even in the joint part where both members are connected so that they can be separated from each other, and it is possible to prevent the leg reinforcing material from bending in the joint part in an unexpected direction and to stabilize the stability. Can be improved. In particular, according to claim 4, since the projection and the groove are engaged with each other on both sides of the first lock member, the engagement area is large and the engagement depth is shallow to engage / disengage. Even if the operation is easily performed, a stable locked state can be obtained.

According to the invention of claim 5 , a stopper for abutting one end of the first lock member and the second lock member against the other lock member to prevent rotation in the contact direction is provided. Since it is fixed, it is possible to reliably prevent the first and second lock members from further rotating beyond the extended state at the joint when the leg reinforcement is changed from the folded state to the extended state, and safety is improved. To do.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of a work scaffold of the present invention.

FIG. 2 is a side view of the embodiment.

3 is a sectional view taken along the line AA of FIG.

FIG. 4 shows details of a joint portion of the leg reinforcing material of the embodiment,
(A) is a plan view, (b) is a front view, (c) is B of (b).
FIG. 6 is a sectional view taken along arrow B.

FIG. 5 is a front view of the process of folding the legs in the embodiment.

6A and 6B show joints in the process of folding the legs in the same embodiment, FIG. 6A is a front view, and FIG. 6B is a C- of FIG.
It is a C arrow line sectional view.

FIG. 7 is a front view of the working scaffold of the embodiment in a folded state.

[Explanation of symbols]

1 stage section 12 legs 18 leg reinforcement 21 joints 22 First locking member 23 Second lock member 24 connecting shaft 25 Compression spring (biasing means) 26 ridges 27 groove 28 Stopper

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Claims (5)

(57) [Claims] 1. A stage section for performing work, a leg body rotatable between an expanded state and a folded state along the back surface of the stage section, a lower leg body and a back surface of the center section of the stage section in a bracing shape. In a work scaffold equipped with a leg reinforcing material capable of bending and stretching at an intermediate joint between a state of being connected and a state of being folded along the back surface of the stage portion, the joint portion is rotatably movable in the bending and stretching directions. A first lock member and a second lock member which are pivotally supported by a connecting shaft and overlapped with each other so as to be separated from each other are provided, and means for urging the first and second lock members in a direction to overlap with each other is provided. , A protrusion and a groove are formed on the overlapping surfaces of the first lock member and the second lock member so as to be engaged with each other .
Moreover, the ridge and the groove are so that their center lines pass through the axis of the connecting shaft.
Work scaffold characterized by being formed into . 2. The work scaffold according to claim 1, wherein the projections and the grooves have a trapezoidal cross-sectional shape. 3. A second lock member is disposed on both sides of the first lock member, and a ridge and a groove are formed on both side surfaces of the first lock member and the overlapping surface of the second lock member, respectively. The work scaffold according to claim 1 or 2 , characterized in that. 4. A second lock member is disposed on both sides of the first lock member, a protrusion and a groove are formed on the overlapping surface of the first lock member and the second lock member on one side, and the overlapping lock on the other side. The work scaffold according to claim 1 or 2 , wherein the surface is a flat surface. 5. A stopper is fixed to one end of one of the first lock member and the second lock member, the stopper contacting the other lock member and preventing rotation in the contact direction. Work scaffolding according to Item 1.