JP2579727B2 - Angle adjustment mounting bracket for temporary step - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an angle-adjusting mounting bracket used for mounting a step board of a temporary step used as a stair on a temporary scaffold or the like at a construction site.

[0002]

2. Description of the Related Art A temporary step, which is used as a temporary scaffolding at a construction site, is to perform a stair function as a whole by attaching a plurality of treads to side beams such as a single pipe by clamping at both ends thereof. By the way, since this temporary step is required to be used for various gradients depending on the situation of the scaffold,
By providing the angle adjustment mounting bracket having the clamp at both ends of the step board, the clamp and the step board can be fixed so that the relative angle can be changed. Conventionally,
As this kind of angle adjustment mounting bracket, a fixing plate having a clamp and a vertical step mounting plate protruding from both ends of a stepping plate for stairs are fastened by shaft bolts. There is known a configuration in which the mounting set angle of the stair stepping plate is maintained by the applied frictional resistance between the fixing plate and the mounting plate.

[0003] However, the above angle adjusting mounting brackets may cause insufficient fastening of the shaft bolts or warping of the fixed plate and the mounting plate so that the processed portions of the chrysanthemum plate move away from each other due to excessive tightening of the shaft bolts. As a result, there is a possibility that a sufficient holding force for the set mounting angle cannot be obtained.

As a prior art in which this disadvantage is improved, there is, for example, an angle adjusting mounting bracket of a temporary step disclosed in Japanese Utility Model Publication No. 56-16366. As shown in FIG. 5, the angle adjusting mounting bracket has a shaft hole (33a) formed in a protruding portion of a vertical step mounting plate (33) integrally protruding from both side edges of a stair stepping plate (32). Engagement holes (33b) are formed at regular intervals on the circumference of the axis of the shaft hole (33a), and a clamp (35) is integrally provided outside the step mounting plate (33). A plate (34) is provided, and a shaft bolt (37) is attached to the fixing plate (34) so as to fit into the shaft hole (33a). The engaging hole (33a) is formed in the fixing plate (34). Are provided with several engaging projections (34b) which fit into the shaft, and a fastening nut (38) is screwed into the shaft bolt (37) inside the fixing plate (34). The angle adjustment mounting bracket (3
In 1), the stair step plate (32) is held at the set angle by the shear resistance between the engaging projection (34b) and the engaging hole (33b), and is set by the friction between the step mounting plate and the fixing plate. It had a large angle holding force as compared with the previous angle adjusting mounting bracket for holding the angle.

At the time of use of the angle adjustment mounting bracket (31), as shown in FIG. 4, a clamp (35) is fixed to two single pipes (50) (50) as side girders. By loosening the tightening nut (38) and moving the fixing plate (34) outward, the fixing plate (34) and the tread plate (32) are made rotatable. The engaging projection (34b) is inserted into the engaging hole (33b) while supporting the stair stepping plate (32) substantially horizontally, and the fixing plate (34) and the mounting plate (33) are securely engaged. Tighten the tightening nut (38) until the installation of one temporary step is completed. By repeating the above operation, a plurality of temporary steps are attached at predetermined intervals and used as temporary steps.

[0006]

[Problems to be solved by the invention]
The angle adjustment mounting bracket for a temporary step disclosed in Japanese Patent No. -16366 has an outstanding set angle holding force, but further shows other disadvantages of the previous angle adjustment mounting bracket. .

As described above, when attaching the second and subsequent temporary steps, the spacing between the two single pipes for the side beam is fixed by the attached step. However, in order to adjust the angle of the stair stepping plate, the conventional angle adjustment mounting bracket that holds the set angle by frictional resistance requires a certain amount of frictional contact between the two plates so that the step mounting plate and the fixed plate can rotate. I have to solve it. That is, it is necessary to move the fixing plate outward to some extent. Therefore, when setting the angles of the second and subsequent temporary steps, the angle cannot be adjusted unless the distance between the two fixed single tubes for the side girders is increased even slightly. Therefore, as the number of attached temporary steps increases, the angle adjustment becomes more difficult.

In addition, the angle adjusting mounting bracket for the temporary step disclosed in Japanese Utility Model Publication No. 56-16366 discloses an engaging projection (34) from the engaging hole (33b) at the time of setting the angle.
It is necessary to move the fixing plate (34) outward until b) is completely pulled out. This allows the angle adjustment mounting bracket to:
There is a problem that the angle adjustment is more difficult than the angle holding by friction.

SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to provide a temporary step angle adjusting bracket which can easily set an angle even as a mechanism for holding a set angle of a step with a shear resistance.

[0010]

In order to achieve the above object, the present invention provides a vertical step mounting plate which is provided on both sides of a stair stepping plate inside a fixing plate having a side beam clamp which can be fixed to a side beam. The lock plate is disposed in an opposed manner via the fixing plate, the fixing plate, the mounting plate and the lock plate are loosely fastened by a shaft bolt, and the axis of the shaft bolt of each of the fixing plate and the lock plate is centered. A fixed angle fixing means for fixing the fixed plate and the lock plate at a variable angle on a circumference having the same radius is provided, and the lock plate locks the tread plate in an abutting state. Means for moving the lock plate inward along with the operation of loosening the shaft bolt between the mounting plate and the lock plate; and In the tightened state of the bolt, The fixed plate and the lock plate are fixed so as not to rotate, and the lock plate is moved inward by a loosening operation of the shaft bolt so that the set angle fixed state between the lock plate and the fixed plate can be released. The gist of the invention is a temporary step angle-adjusting mounting bracket characterized by being constituted.

In a preferred embodiment, in the temporary step angle adjusting mounting bracket, the follow-up moving means comprises a coil spring interposed between the step mounting plate and the lock plate.

[0012]

According to the present invention, in the use of the angle adjusting mounting bracket for a temporary step, a clamp is fixed to a single pipe for a side beam, and then a shaft bolt is loosened to move a lock plate inward. By widening the distance between the lock plate and the fixed plate to release the frictional contact or engagement between the two plates,
At the same time as making the fixed plate and the lock plate freely rotatable
The stair step plate is also rotatable with respect to the fixed plate. And while supporting the stair tread almost horizontally, tighten the shaft bolt again to move the lock plate outward,
The setting of the mounting angle is performed. Therefore, the distance between the side beam clamps at both ends of the shaft bolt does not change between the tightened state and the loosened state. Therefore, even when the second and subsequent temporary steps are mounted, it is not necessary to expand the side girders on both sides when adjusting the mounting angle, and mounting can be performed easily.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a temporary step angle adjusting fitting according to the present invention.

In the temporary step (1) shown in FIG. 1, (2) is a step plate for stairs, (3) is a vertical step mounting plate, (4) is a fixing plate, (5) is a clamp for side beams, and (6) )
Is a lock plate, (7) is a shaft bolt, (8) is a bearing nut, and (9) is a conical coil spring.

As shown in FIG. 2, the stair step board (2) is made of metal and has a generally rectangular shape having a large thickness. Vertical step mounting plates (3) and (3) at positions slightly ahead of the center of both short side edges of the tread plate (2).
However, they are integrally protruded in the rising state. In addition, in this specification, the front means the toe direction when climbing the stairs.

The vertical step mounting plate (3) has a substantially pentagonal shape in which the lower portion is a rectangle and the upper portion is a substantially triangular shape which is cut off by an arc in which the top corners are inscribed on both sides forming the corners. As shown in FIG. 1, the mounting plate (3) has a shaft hole (3a) formed coaxially with the arc. Outside the vertical step mounting plate (3), a disk-shaped fixing plate (4)
Is provided. The vertical step mounting plate (3) is provided in a rising state so that the fixed state of the set angle of the step plate (2) can be easily checked after the mounting of the temporary step (1). It may be protruded from both short side edges of 2) in a hanging state.

The fixing plate (4) is provided with a bearing hole (4a) at the center thereof, and is equally spaced on the entire circumference of a concentric circle slightly smaller than the contour circle of the fixing plate (4). A plurality of engagement holes (4b) are formed. A bearing nut (8) is integrally fixed to the outer surface side of the fixing plate (4) so as to communicate with the bearing hole (4a). Further, a side beam clamp (5) is integrally fixed to the outer surface side of the fixing plate (4). In the illustrated embodiment, the engaging hole (4b) is provided on the entire circumference of the fixing plate (4), but is not necessarily provided on the entire circumference.
a) may be provided on an arc having a central angle obtained by adding a necessary set angle range to the central angle of the arc in which a) is arranged. Further, the bearing nut may not be provided if the bearing hole serves as a female screw formed by cutting the internal thread.

The lock plate (6) is provided inside the vertical step mounting plate (3). When viewed from the front, the lock plate (6) has a substantially semi-track shape in which the upper portion is a semicircle having the same diameter as the circle in which the engagement holes (4b) are arranged, and the lower portion is substantially rectangular. The bottom edge of the lock plate (6) serves as an angle restricting portion (6a) that comes into contact with the upper surface of the stair step plate (2). The lock plate (6) is
A spring holding portion (6b) is provided in a bulging shape inwardly coaxially with the upper semicircle, and a shaft mounting hole (6c) is formed at the center of the spring holding portion (6b). On the outer edge of the lock plate (6) other than the angle restricting portion (6a), an edge wall (16) is integrally protruded outward. At the tip of the semi-cylindrical portion of the edge wall (16), an engagement projection (16a) is provided so as to project at the same interval as the engagement hole (4b). The number of the engagement projections may be such that the shear resistance of the engagement projections can safely bear the moment around the shaft bolt (7) when a load is applied, and the cross-sectional area of the engagement projections is sufficiently large. One may be sufficient. In addition, the angle restricting portion is for non-rotatably engaging the tread plate (2) with the lock plate (6). By doing so, the angle regulating portion may also be used.

The shaft bolt (7) passes through the shaft mounting hole (6c), the conical coil spring (9), the shaft hole (3a), and the bearing hole (4a) in this order, and the bearing nut ( 8). At least the shaft mounting hole (6c) and the shaft hole (3a) are stupid holes with respect to the shaft bolt (7),
Therefore, the lock plate (6) and the mounting plate (3) are rotatable with respect to the fixing plate (4) when the shaft bolt (7) is in a relaxed state. The shaft bolt may be inserted into the position from outside. In this case, the bearing nut is screwed into the shaft bolt from inside. It is desirable that the head of the shaft bolt is fixed to the fixing plate.

The conical coil spring (9) follows the inward movement of the shaft bolt (7) in the relaxed state of the shaft bolt (7) by constantly biasing the lock plate (6) inward. Then, the lock plate (6) is forcibly moved inward. The coil spring (9) in the illustrated embodiment may be changed to a locking nut fixed to an appropriate position of the shaft bolt so as to rotatably clamp the lock plate to the shaft bolt. Further, the slip-preventing nut can be arbitrarily changed in design to a split pin, a spring pin, a retaining ring, or the like.

In the illustrated embodiment, as shown in FIG. 4, the clamps (5) and (5) are first fixed to the single pipes (50) and (50) for the side girders, as shown in FIG. Mounted. Then, after loosening the shaft bolt (7) to make the fixing plate (4) and the tread plate (2) freely rotatable, the engaging protrusion (16a) is engaged with the engaging hole while supporting the tread plate (2) substantially horizontally. Tighten the shaft bolt (7) until it is inserted into (4b) and the fixing plate (4) and the locking plate (6) are firmly engaged. When the next step (1) is mounted, the above operation is repeated. When adjusting the mounting angle, the lock plate (6) is moved inward to release the set angle fixed state. It is not necessary to expand the space between the two single tubes (50) (50) unlike the conventional product in which the angle is fixed by releasing the plate outward. Therefore, even if the distance between the two single tubes (50) and (50) is fixed by the attached step (1), the angle setting operation can be easily performed.

In the illustrated embodiment, the clamp (5) is shown as being for a single pipe. However, the clamp (5) can be arbitrarily changed to a clamp for a square pipe or the like in accordance with the purpose or place of use of the temporary step. is there.

In the illustrated embodiment, the lock plate (6) is used.
The set angle is held by engaging the engaging projection (16a) provided on the fixed plate (4) with the engaging hole (4b) provided on the fixing plate (4). A configuration in which the engagement protrusion is provided on the fixed plate and the engagement hole is provided on the lock plate may be employed. Alternatively, it is also possible to provide a configuration in which engagement projections are provided on both the fixed plate and the lock plate, and the engagement projections mesh with each other. The fixing plate and the lock plate are desirably engaged as described above. However, the fixing plate and the lock plate may be configured to maintain the mounting set angle of the temporary step main body by frictional resistance generated by mutual contact.

[0024]

According to the present invention, the angle adjusting mounting bracket for a temporary step has a configuration in which the fixed plate and the lock plate are provided with the set angle fixing means so that the lock plate is moved inward to release the set angle fixed state. Therefore, even when the second and subsequent temporary steps are mounted, it is not necessary to increase the distance between both side girders when adjusting the mounting angle, and the temporary steps can be easily mounted.

Further, by having the above configuration, it is possible to achieve both the improvement of the mounting set angle holding force and the simplicity of the mounting operation of the temporary step, except for the harmful effect of the configuration in which the mounting set angle is maintained by the shear resistance. Things.

Further, as in the second aspect of the present invention, the follower moving means comprises a coil spring, so that the fixed plate is always pressed against the vertical step mount plate and is attached to the fixed plate. Appropriate friction occurs between the plate and the plate, and rattling of the clamp during mounting of the temporary step is suppressed, so that mounting of the temporary step is further facilitated.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a configuration of a temporary step angle adjusting fitting according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the entire temporary step according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line III-III in FIG. 2;

FIG. 4 is a perspective view showing a use state of a temporary step using the angle adjustment fitting according to the present invention.

FIG. 5 is an exploded perspective view showing the configuration of a conventional temporary step angle adjusting mounting bracket.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Temporary step 2 ... Step board for stairs 3 ... Vertical step mounting plate 4 ... Fixing plate 4b ... Engagement hole (setting angle fixing means) 5 ... Clamp for side beam 6 ... Lock plate 6a ... Angle regulating part (angle regulating means) 16a: engagement protrusion (set angle fixing means) 7: shaft bolt 9: conical coil spring (following movement means)

Claims (2)

(57) [Claims] A side beam clamp (5) which can be fixed to a side beam.
The lock plate (6) is disposed in opposition to the inside of the fixing plate (3) having a vertical step mounting plate (3) protruding from both side edges of the stair stepping plate (2). The plate (4), the mounting plate (3) and the lock plate (6) are loosely fastened by a shaft bolt (7), and the shaft bolt (7) of each of the fixed plate (4) and the lock plate (6) is loosened. ) Are provided with setting angle fixing means (4b) (16a) capable of fixing the fixing plate (4) and the lock plate (6) at a variable angle on a circumference having the same radius centered on the axis of (2). The lock plate (6) includes an angle regulating means (6a) for locking the tread plate (2) in an abutting state, and the lock plate (6) is provided between the mounting plate (3) and the lock plate (6). Shaft bolt (7)
A follower moving means (9) capable of forcibly moving the lock plate (6) inward with the relaxing operation of the shaft is provided, and the set angle fixing means (4b) (16a) is connected to the shaft bolt (7).
In the tightened state, the fixed plate (4) and the lock plate (6) are fixed so as not to rotate, and the lock plate (6) is moved inward by a loosening operation of the shaft bolt (7). An angle-adjusting mounting bracket for a temporary step, characterized in that the angle setting between the lock plate (6) and the fixing plate (4) can be released. 2. The angle adjusting mounting bracket for a temporary step according to claim 1, wherein said follower moving means (9) comprises a coil spring interposed between said step mounting plate (3) and a lock plate (6). .