JP3447118B2 - Handrail frame for 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 scaffolding handrail frame installed on a workbench for scaffolding used for interior work of buildings or other scaffolding boards.

[0002]

2. Description of the Related Art In a construction site such as a building, a workbench is used for work in a relatively high place such as a ceiling when interior finishing and wiring work are performed after a skeleton is constructed.

As a work platform of this kind, it is provided with a scaffolding plate on which the work is carried out and foldable support legs, and when used, the support legs are expanded to stand upright in the use position. It is known that when not in use, it can be folded into a stored state, and the support legs can be expanded and contracted according to the working height.

By the way, in this type of workbench, in order to ensure safe work, when the height of the scaffold plate exceeds 2 m, it is obligatory to install a handrail frame around it.
Even if the height is less than that, it is preferable to attach a handrail frame from the viewpoint of ensuring safety.

As such a handrail frame for a workbench, one in which the handrail frame is fixed to the scaffold plate by bolting is known. It is also known that the scaffolding plate is provided with a tubular hole, and the handrail frame is attached by fitting the legs of the handrail frame into the tubular hole.

[0006]

However, in the conventional bolting type handrail frame, there is a problem that the work of mounting the handrail frame is troublesome and the work efficiency is lowered.
Also, since it is supported only by the lower end of the handrail frame, it is weak in strength,
If it is attempted to provide sufficient strength, there is a problem that the weight of the scaffolding plate and the components of the mounting portion of the handrail frame becomes large, and the weight and cost of the scaffolding plate increase.

Further, in the method of fitting in the tubular hole portion, the handrail frame mounting operation is simple, but it is necessary to provide the tubular hole portion in the scaffold plate, which complicates the construction of the scaffold plate. There is a problem of high weight and high cost.

In view of the above-mentioned problems of the prior art, it is an object of the present invention to propose a scaffolding handrail frame which is easy to mount and which is capable of ensuring a sufficient strength while reducing the weight of the scaffolding plate.

[0009]

In order to achieve the above-mentioned object, the present invention, if indicated by reference numerals in the drawings, is the same as the scaffold plate 2 along the side edge in claim 1. A handrail frame main body 12 arranged on the outer side of the handrail frame, and a hook which is provided at an intermediate portion in the vertical direction of the handrail frame main body 12 and which can be fitted and engaged from above into a locking hole 16 formed in the peripheral portion of the upper surface of the scaffolding plate 2. Part 13
The support legs 5 of the scaffolding plate 2, which are provided below the handrail frame body 12,
The a holding capable holding portion 14, the hook portion 13, the foot
The lifting prevention piece 19 that engages with the lower surface of the field plate 2 is integrally formed.
It adopts a configuration that is connected to .

[0010]

In the second aspect , the holding portion 14 is fixed to the lower portion of the handrail frame main body 12 at a position facing the supporting leg 5.
An embracing bracket 21 having a planar U-shaped fitting portion 22 that can be fitted to the support leg 5, and the open end of the fitting portion 22 can be opened and closed while the support leg 5 is fitted to the fitting portion 22. The opening and closing lever 23 for closing the opening is provided.

According to a third aspect of the present invention, a pivot shaft 26 is provided at one end of the opening / closing lever 23 and is pivotally and vertically movable on one end of the fitting portion 22. The structure according to claim 2 , wherein a locking shaft 27 that can be engaged with a locking hole 25 formed downward on the upper surface of the other end of the fitting portion 22 is hung at the other end. is there.

[0013]

In the first aspect of the present invention, the handrail frame main body 12
Of the scaffolding plate 2 with the hook portion 13 provided in the vertical middle portion of the
A holding portion 14 provided on the lower portion of the handrail frame main body 12 by being fitted and engaged from above into a locking hole 16 formed in the peripheral portion of the upper surface.
By holding the support legs 5 of the scaffolding plate 2 with, the handrail frame can be attached by a simple operation. In the mounted state, the hook portion 13 engages with the upper surface of the scaffolding plate 2 to support the weight, and the hook portion 13 and the locking hole 16 engage with each other to fix the position in the horizontal direction. When a load is applied to the upper part of the upper part 12 toward the outside, the moment acting on the handrail frame body 12 by the load is hooked to the hook part 13 and the holding part 1 which are vertically spaced apart from each other.
Since it is supported at two points by 4, it is possible to support a large load, and the handrail frame 11 having sufficient strength can be constructed. Further, since it suffices to form the locking hole 16 on the upper surface of the peripheral edge portion originally formed of the strength member for the scaffolding plate 2, the scaffolding plate 2 has a structure for mounting the handrail frame 11. The weight and cost can be reduced without increasing complexity and weight.

[0014] In the Claim 1, the hook portion 13
It is possible to reliably prevent the lifting of the handrail frame body 12 by engaging the lifting prevention piece 19 integrally connected to the lower surface of the scaffolding plate 2, and a large upward force is exerted on the handrail frame 11 for some reason. Also in case of hook 13 and locking hole 1
There is no risk that the engagement of 6 will be disengaged, and high reliability can be secured.

In the second aspect , the holding bracket 21
The support leg 5 can be held by a simple operation by fitting the support leg 5 into the flat U-shaped fitting portion 22 and closing the open end of the fitting portion 22 with the opening / closing lever 23. .

In the third aspect , the opening / closing lever 23 is rotated around the pivot shaft 26 at one end thereof to close the open end of the fitting portion 22, and then lifted once to lock the other end. By fitting the shaft 27 into the engaging hole 25 at the tip of the fitting portion 22, the support leg 5 can be securely held by simply operating the opening / closing lever 23 having a simple structure.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a workbench to which the scaffolding handrail frame of the present invention is applied will be described below with reference to FIGS.

In FIG. 6 showing the overall structure, reference numeral 1 is a workbench on which a worker rides and works on a ceiling or the like. A scaffolding plate 2 constituted by joining thin aluminum template plates of about 1 mm thickness, and a scaffolding plate. 2 Pivot brackets 3 attached to the front, rear, left and right four corners of the lower surface, left and right leg mounting shafts 4 installed between the front and rear pivot brackets 3, 3 and front and rear of the left and right leg mounting shafts 4, respectively. It is composed of the supporting legs 5 formed. Each support leg 5 is rotatably attached to the leg attachment shaft 4 between an upright state and a stored state folded along the lower surface of the scaffolding plate 2.

Each supporting leg 5 is composed of an upper leg member 6 whose base is attached to the leg mounting shaft 4 and a lower leg member 7 fitted to the upper leg member 6, and the lower leg is adjusted by a leg length adjusting device 8. The member 7 can be extended and contracted with respect to the upper leg member 6. The lower leg portions of the upper leg members 6 and 6 of the front and rear support legs 5 and 5 and the lower end portions of the lower leg members 7 are connected by horizontal rails 9a and 9b, and are reinforced in the front-rear direction. Also, the back surface of the center of the scaffolding plate 2 and the left and right cross rails 9a
Is rotatably connected by a reinforcing bar 10 having a joint part 10a that can be folded in half in the middle part.

Handrail frames 11a to 11d are attached to the outer sides of the four sides of the scaffold plate 2 along the respective side edges. Each of the handrail frames 11a to 11d has a size and a detailed shape.
The structure is basically the same, though slightly different depending on the mounting position, and the structure will be described below as the handrail frame 11. The front handrail frame 11a is provided with an entrance 30 and a door 31 that can be opened only inside, and a ladder 32 can be hung on the lower part of the entrance 30.

The handrail frame 11 is, as shown in FIG. 1, a handrail frame body 12 assembled by welding an aluminum pipe into a frame shape.
A hook portion 13 fixed near both side ends of an intermediate horizontal rail 12a horizontally extended from the lower end of the handrail frame body 12, and a lower horizontal rail 1 horizontally attached to the lower end of the handrail frame body 12.
The holding portion 14 is attached to both end portions of the 2b.

On the other hand, as shown in FIG. 2, a reinforcing frame 15 having a U-shaped planar shape and made of an aluminum die member having a thick plate-shaped cross section is fixed to the peripheral portions of the right and left sides of the scaffolding plate 2. ,
On both sides of each corner, an elongated hole-like locking hole 16 is formed on the upper surface at a position at an appropriate distance from the corner. Note that FIG.
In the figure, 17 is a cushioning member attached to the outer surface of the corner,
Reference numeral 8 is a connecting hole used when connecting a plurality of worktables 1 to each other to form a large work surface.

The hook portion 3 is, as shown in FIGS. 3 and 4,
It is composed of a hook member 20 having a fitting tubular portion 20a which is externally fitted to the intermediate horizontal rail 12a and fixed at an appropriate position with a screw or the like. That is, the hook portion 3 extends in an inverted L-shape so that the hook portion 3 engages with the upper surface of the reinforcing frame 15 from the upper portion of the fitting tubular portion 20a and engages with the locking hole 16 from above. In addition, the hook member 20 is provided with a floating prevention piece 19 that integrally extends from the lower portion of the fitting tubular portion 20a in an L shape and engages with the lower outer surface and the lower surface of the reinforcing frame 15.

The holding portion 14 is, as shown in FIGS. 3 and 5,
The hook portion 3 is fitted into and engaged with the locking hole 16 so that the handrail frame body 1
The support leg 5 is configured to be able to be held when the 2 is in the vertical posture. Specifically, on both sides of the lower end of the handrail frame body 12, a holding bracket 21 is fixed so as to face the support leg 5 and across the end of the lower horizontal rail 12b. A flat-shaped U-shaped fitting portion 22 into which approximately half of the support leg 5 can be fitted is formed in the portion, and the open side of the fitting portion 22 is openably and closably closed with the support leg 5 fitted in the fitting portion 22. An opening / closing lever 23 is provided. That is, the fitting portion 2
A bearing portion 24 for rotatably supporting the opening / closing lever 23 is provided on one side portion of the tip end of the No. 2 and a locking hole 25 is provided on the other side portion of the tip end. The opening / closing lever 23 is configured to bend the rod material into a U-shape in plan view and hold the support leg 5 with the fitting portion 23. The opening / closing lever 23 rotates from one end thereof to the bearing portion 24. Also, a pivot shaft 26 that is vertically movably fitted is hung, and a locking shaft 27 that can be fitted and engaged in the locking hole 25 is hung from the other end. The pivot shaft 26 is supported by the bearing portion 24 and the locking shaft 27.
Is formed longer than the bearing portion 24 so that it can move up and down within a range where it can be engaged with and disengaged from the locking hole 25, and a retaining nut 28 is fixed to the lower end portion thereof.

With the above construction, when performing work at a high place such as interior finishing of the ceiling, wiring in the ceiling, and piping work, as shown in FIG. 6, the supporting legs 5 folded on the lower surface of the scaffolding plate 2 are used. Is rotated about the leg mounting shaft 4 in an upright state, and at the same time, the reinforcing bar 10 is extended from the state of being folded in two by the joint device 10a to be in a straight state. By extending the reinforcing bar 10 in a straight line in this manner, the support leg 5 connected to the reinforcing bar 10 can be firmly maintained in a used state. Next, the leg length adjusting device 8 is operated to adjust the leg length of each support leg 5 so as to be able to expand and contract. As a result, the height of the scaffolding plate 2 becomes 1.2 to 1.5 m or more, and when it becomes necessary to mount the handrail frame 11 to ensure safe work, the handrail frame 11 is appropriately mounted around the scaffolding plate 2.

When mounting the handrail frame 11 around the scaffolding plate 2 of the workbench 1, as shown in FIG.
The hook portion 13 attached to 2a is fitted from above into the locking hole 16 formed in the upper surface of the reinforcing frame 15 at the peripheral edge of the scaffolding plate 2 to obtain the state shown in FIGS. 3 and 4 (b). At this time, the handrail frame main body 12 is inclined so that the lower portion thereof protrudes to the outside of the scaffolding plate 2 to prevent the lifting prevention piece 19 from interfering with the reinforcing frame 15. Next, as shown in phantom lines in FIGS. 4C and 3, the handrail frame main body 12
When the vertical position is set to the vertical position, the lifting prevention piece 19 integrally connected to the hook portion 13 engages with the outer surface and the lower surface of the lower portion of the reinforcing frame 15, and the holding portion provided on the lower portion of the handrail frame body 12. Since the support leg 5 fits into the planar-shaped U-shaped fitting portion 22 of the holding bracket 21 in 14, the support leg 5 is held by closing the opening / closing lever 23 also having the planar-shaped U-shape. At that time, as shown in FIGS. 5A and 5B, the opening / closing lever 23 is rotated around the pivot shaft 26 as shown by an arrow A to close the open side of the fitting portion 22, and then the arrow. As shown in B, the locking shaft 27 at the other end is temporarily lifted and the locking hole 2 at the tip of the fitting portion 22
It suffices to insert and engage with the opening / closing lever 5, and the opening / closing lever 2 can be operated with a simple operation.
The support leg 5 can be held by the unit 3.

As described above, the hook portion 13 is engaged with the locking hole 16
The handrail frame 11 can be attached to the scaffolding plate 2 by a simple operation in which the supporting leg 5 is held by the holding portion 13 while being fitted in and engaged with the handrail frame 11 from above.

Thus, with the scaffolding frame 11 attached, the hook portion 13 engages with the upper surface of the scaffolding plate 2 to support the weight, and the hook portion 13 and the locking hole 16 are provided.
The lifting prevention piece 1 is fixed in the horizontal direction in the front, rear, left, and right by the engagement with and is integrally connected to the hook portion 13.
By engaging 9 with the lower surface of the scaffolding plate 2, the handrail frame body 12 is surely prevented from rising, and even if a large upward force is applied to the handrail frame body 12 for some reason, the handrail frame body 12 is locked with the hook portion 13. There is no risk of disengagement of the hole 16, and when the upper part of the handrail frame body 12 is inclined inward, the lifting prevention piece 19 is disengaged, and the hook portion 13 and the engagement groove 16 are disengaged. There is a possibility, but the handrail frame body 1
Since the supporting leg 5 is held by the holding portion 14 at the lower end of the handrail 1, the handrail frame body 12 does not take such an oblique posture.

Further, when a load is applied to the upper part of the handrail frame body 12 toward the outside, the moment acting on the handrail frame body 12 by the load is held by the hook portion 13 which is vertically spaced. Since two points are supported by the part 14,
The handrail frame 11 that can support a large load and has sufficient strength can be configured.

Further, with respect to the scaffolding plate 2, locking holes 16 are provided on the upper surface of the reinforcing frame 15 originally provided at both left and right ends thereof.
Since it is only necessary to form the scaffolding, it is possible to reduce the weight and the cost of the scaffolding plate 2 due to the mounting of the handrail frame 11 without complicating the structure and increasing the weight of the scaffolding plate 2.

In the above embodiment, an example of the workbench 1 in which the foldable support legs 5 are attached to the lower surface side of the scaffolding plate 2 is shown, but the present invention is not limited to this kind of workbench, and a scaffolding plate may be used. It can also be applied to a handrail frame provided on various scaffolding frames configured by combining support legs for supporting the same.

[0032]

According to the first aspect of the present invention, the hook portion provided at the intermediate portion in the vertical direction of the handrail frame body is fitted from above into the engaging hole formed in the peripheral portion of the upper surface of the scaffolding plate. The handrail frame can be attached by a simple operation by holding the supporting legs of the scaffolding plate by the holding portion provided at the bottom of the handrail frame main body, and the hook portion can be attached to the scaffolding plate in the attached state. The weight is supported by engaging the upper surface, the horizontal position is fixed by the engagement of the hook portion and the locking hole, and the handrail frame when the load acts outward on the upper part of the handrail frame. Since the moment acting on is supported at two points by the hook part and the holding part, which are vertically spaced apart,
A handrail frame capable of supporting a large load and having sufficient strength can be configured. Further, since it is only necessary to form the locking hole on the upper surface of the peripheral portion which is originally composed of the strength member for the scaffolding plate, the scaffolding plate is complicated in structure and weight for mounting the handrail frame. It is effective in reducing the weight and cost without increasing the number.

Further, according to claim 1, it can be reliably prevented lifting of the handrail frame by engaging the lower surface of the scaffolding plate preventing piece lifting is integrally connected to the hook, in some form factors Even if a large upward force is applied to the handrail frame, there is no risk that the hook portion will disengage from the locking hole.
High reliability can be secured.

According to the second aspect , the supporting leg is fitted to the U-shaped fitting portion of the holding bracket in a plan view, and the open end of the fitting portion is closed by the opening / closing lever to support the holding operation with a simple operation. You can hold your legs.

According to the third aspect , the opening / closing lever is rotated around the pivot shaft of the one end thereof to close the open end of the fitting portion,
By temporarily lifting and fitting the engagement shaft of the other end into the engagement hole at the tip of the fitting portion, the structure of the opening / closing lever is simple and the support leg can be held by a simple operation.

[Brief description of drawings]

FIG. 1 shows an overall schematic configuration of a scaffolding frame of one embodiment of the present invention, (a) is a front view and (b) is a side view.

FIG. 2 is a partial plan view of a workbench to which the scaffolding frame of the embodiment is attached.

FIG. 3 is a schematic side view of a process of attaching the scaffolding frame of the same embodiment.

FIG. 4 is a side view showing an attachment process in the hook portion of the scaffold frame of the same embodiment.

5A and 5B show a holding portion of the scaffolding frame of the embodiment, FIG. 5A is a side view, and FIG. 5B is a cross-sectional plan view taken along the line VV of FIG.

FIG. 6 is an overall perspective view of a workbench with a handrail frame attached in the embodiment.

[Explanation of symbols]

2 scaffolding boards 5 support legs 11 handrail frame 12 Handrail frame body 13 Hook part 14 Hugs 16 Locking hole 19 Lifting prevention piece 21 Holding bracket 22 Fitting part 23 Open / close lever 25 Locking hole 26 Axis 27 Locking shaft

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yutaka Yamaoka 1-1-1 Mishimae, Takatsuki City, Osaka Prefecture Allinco Co., Ltd. (72) Hidenobu Kubo 4-1-1-13 Honmachi, Chuo-ku, Osaka City, Osaka Prefecture No. Takenaka Corporation Osaka Main Store (72) Inventor Riichiro Tsuji 4-13 Hommachi, Chuo-ku, Osaka City, Osaka Prefecture Takenaka Corporation Osaka Main Store (72) Inventor Tsuji Tsuyoshi Nihonbashi, Chuo-ku, Tokyo 3 6-2 No. 6 Asahi Kikai Co., Ltd. (56) References 58-57435 (JP, U) 58-148301 (JP, U) (58) Fields investigated (Int.Cl. ⁷⁾ , DB name) E04G 1/14-1/15 E04G 1/20-1/34 E04G 5/08 E04B 1/60

Claims (3)

(57) [Claims] 1. A handrail frame main body that is arranged outside along a side edge of the scaffolding plate, and a locking hole that is provided in an intermediate portion in the vertical direction of the handrail frame main body and is provided in a peripheral edge portion of the top surface of the scaffolding plate. comprising a fitting engageable hook portion from above, provided in the lower portion of the handrail frame body, the support leg scaffold plate and embracing capable holding portion, off
A lifting prevention piece that engages with the bottom surface of the scaffolding plate
A handrail frame for scaffolds characterized by being integrally connected . 2. A holding bracket, wherein the holding portion is fixed to a lower portion of the handrail frame main body at a position facing the supporting leg, and has a planar U-shaped fitting portion that can be fitted into the supporting leg. The handrail frame for scaffolding according to claim 1, further comprising: an opening / closing lever that opens and closes an open end of the fitting portion with the support leg fitted to the portion. 3. An opening / closing lever is provided at one end thereof with a pivot shaft that is pivotally and vertically movable on one side of the tip of the fitting portion, and the other end of the opening / closing lever is provided at the tip of the fitting portion. The handrail frame for scaffolding according to claim 2 , wherein a locking shaft that can be engaged with a locking hole that is formed downward on the side upper surface is suspended.