JPS6326071B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for testing the operation of a governor on a lifting scaffold.

Elevating scaffolds are installed at construction sites, etc., and are designed so that the scaffold body can be raised and lowered relative to the racks of pillars that extend in the vertical direction. That is, the scaffold body is equipped with a first pinion that meshes with the rack of the pillar, and a motor that rotationally drives this first pinion, and the scaffold body is raised and lowered by the rotation of this first pinion. I'm starting to do that. The lifting speed of the scaffold itself is approximately 10 m/min.

Incidentally, such lifting scaffolds are equipped with a governor for safety measures. This governor is designed to automatically control the lifting and lowering of the scaffolding body when the lifting speed of the scaffolding body becomes abnormally fast.

This governor is, for example, as shown by reference numeral 1 in FIG. That is, the scaffold body side is provided with a second pinion 3 that meshes with the rack of the pillar, and this second pinion 3 is connected to a vertical shaft 7 via a horizontal shaft 4 and gears 5 and 6. ing. Two weights 8, 8 are suspended from this shaft 7 by links 9, 9, respectively, and the opening angle of each link 9, 9 changes according to the rotational speed of the shaft 7, and this opening angle changes depending on the rotational speed of the shaft 7. Depending on the degree of angle change, these links 9,9
A movable plate 10 spanned between them is designed to move up and down. Further, on the scaffold main body side, a horizontal shaft 12 having left and right stopper claws 11, 11 at both ends is provided, and this shaft 12
are constantly biased by a spring 13 in a direction to align the stopper claws 11, 11 with the corresponding racks 2, 2 of the left and right pillars, respectively. This shaft 12 is provided with a stop lever 14, and the tip of this stop lever 14 is connected to a claw portion 15a at one end of a crank 15 provided on the side of the scaffold body.
It is locked to. The middle part of the crank 15 is rotatable about a horizontal axis,
When the crank 15 itself is rotated in the direction of arrow A, the stop lever 14 is stopped by the claw portion 15a.
is released, and as a result, the shaft 12 rotates and the left and right stopper claws 11, 11 align with the corresponding racks 2, 2, thereby locking the lifting and lowering of the scaffold body. . Further, on the side of the scaffold body, an intermediate portion of the lever 16 is provided so as to be rotatable about a horizontal axis. One end of this lever 16 is connected to the other end of the crank 15 via a rod 17, and the other end is located above the movable plate 10. An adjustment bolt 18 whose displacement can be adjusted in the vertical direction is attached to the other end of the lever 16.

In the governor 1 constructed in this way, when the movable plate 10 moves up to a certain extent according to the lifting speed of the scaffold body, the movable plate 10 moves the crank 15 through the adjustment bolt 18, the lever 16 and the rod 17 in the direction indicated by the arrow A. This allows the scaffold to be rotated in the same direction, thereby automatically locking the lifting and lowering of the scaffolding body. Note that 19 in the figure indicates a lever for returning the shaft 12 to rotation.

Such a governor 1 uses an adjustment bolt 1 to set the lifting speed when locking the scaffold body.
Adjust the speed to 24~25.
It is set at about m/min.

By the way, for such governor 1,
For its operation test and adjustment, the shaft 4
I am trying to rotate it on a trial basis.

Conventionally, in order to rotate the shaft 4 on a trial basis, the second pinion 3 is removed from the shaft 4,
Instead, a handle 20 is attached to the end of the shaft 4, and the handle 20 is manually rotated at a speed of about 9 to 10 times/5 seconds.
However, according to such a test method, two workers are required: a handle operator and a person who measures the operating time, and in addition, rotating the shaft 4 at a predetermined speed with the handle 20 requires a skilled worker. It took.

This invention was made in view of the above circumstances,
By effectively utilizing the motor that drives the scaffolding body up and down,
By configuring the governor to operate on a trial basis, the governor can be tested accurately and in a short time by one worker, and the test is extremely easy to perform without requiring any special skill. The purpose of the present invention is to provide a device for testing the operation of a governor in a scaffolding body.

The governor operation test device for an elevating scaffold according to the present invention includes a pedestal with a rack provided along the vertical direction, and a scaffold body that is attached to the pedestal so as to be able to rise and fall freely. In the configuration in which the scaffold main body is attached to the pillar, a first pinion and a second pinion that mesh with the rack, respectively, a motor to which the first pinion is connected, and the second pinion are connected. In the elevating scaffold, the scaffold main body is raised and lowered by the rotational drive of the first pinion, and the governor is operated by the rotation of the second pinion. 1st pinion shaft mounted on the 1st pinion shaft.
a second pulley attached to the shaft of the second pinion, a belt connecting the first pulley and the second pulley, and a belt provided on the scaffold body to tension and loosen the belt. an operable tension mechanism, and the first,
The second pulleys are configured such that when the motor directly connected to the first pulley is rotated at a constant speed, the rotation of the shaft directly connected to the second pulley is increased to a speed that reaches the operating speed of the governor. The tension mechanism includes a base plate attached to the scaffold body, a handle movably loosely fitted to the base plate, and a tension mechanism that tensions the belt by operating the handle. It is characterized by being comprised of a roller.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 12.
This will be explained based on the diagram. Note that the same parts as those of the above-mentioned conventional one are given the same reference numerals, and the explanation thereof will be omitted.

Reference numeral 21 in the figure indicates a scaffold main body, and this scaffold main body 21 is equipped with a governor 1 similar to that described above, and a first governor that engages with the rack 2 of the pillar.
A pinion 22 is provided below the second pinion 3. This first pinion 2
The second shaft 23 is connected to a motor (not shown), and the scaffold main body 21 is moved up and down by the rotation of the first pinion 22 by this motor. The second pinion 3 is fixed to the end of the shaft 4 by tightening a set screw 24 that is screwed into the end of the shaft 4.

By the way, the test device of this example has a scaffold main body 2.
1 is configured only during testing of the governor 1 before it is attached to the rack 2 of the pedestal. That is, the first and second pulleys 2 are connected to the first and second pinions 22 and 3, respectively.
5 and 26 are attached, a belt 27 is stretched between these first and second pulleys 25 and 26, and a tension mechanism 28 that can tension and loosen the belt 27 is attached to the scaffold main body 21 side. It's getting old.

In the above, the first and second pulleys 25,
26 is configured to increase the rotation speed of the shaft 4 directly connected to the second pulley 26 to a speed that reaches the operating speed of the governor 1 when the lifting motor directly connected to the first pulley 25 is rotated at a constant speed. Each diameter is set. Next, the first and second pulleys 25, 26, belt 27, and tension mechanism 28 will be explained.

The first pulley 25 has a relatively large diameter and has a shape in which a boss portion 25a and a rim portion 25b are integrally connected by three arm portions 25c.
9, it can be detachably attached to the first pinion 22 by a set screw 30 and a nut 31. The set screw 30 has a shape in which the middle portion is bent and both ends extend in the horizontal direction, and a hook portion 30a is provided at one end, and a male thread portion 30b is provided at the other end. A total of three setscrews 30 are provided, and their male threaded portions 30b are inserted between the three arm portions 25c of the first pulley 25 and between the washer 29.
It passes through the hole 29a from the left to the right in FIG. A total of three holes 29a in the washer 29 are provided at three locations located at equal intervals along the circumferential direction of the washer 29. A nut 31 is screwed into the male threaded portion 30b of each set screw 30, respectively.

To install such a first pulley 25,
First, the horizontal portion of each setscrew 30 on the left side in FIG. The hook portion 30a of 30 is locked to the back side of the first pinion 22. Then, tighten each nut 31. As a result, the first pulley 25 is firmly clamped and fixed between the first pinion 22 and the washer 29, as shown in FIG.

Further, the second pulley 26 has a relatively small diameter, and as shown in FIG. 8, a screw 32 similar to the fixing screw 24 of the second pinion 3 is installed on the left end side thereof, as shown in FIG. A nut 33 is screwed onto this screw 32.

To install such a second pulley 26,
First, the set screw 24 is removed from the end of the shaft 4, and then the screw 32 of the second pulley 26 is screwed into the end of the shaft 4 in place of the set screw 24. Then, tighten the nut 33 to the shaft 4 side. As a result, as shown in FIG.
6 are firmly fixed together.

The tension mechanism 28 also includes a substrate 34 having a U-shaped cross section as shown in FIGS. 11 and 12.
It is adapted to be attached to the side of the scaffold main body 21 by using it as a bracket. A bolt 35 is screwed onto one side 34a of the base plate 34 from right to left in FIG.
A threaded rod 36 extending to the left in FIG. 11 is fixed to the outside of 4b. This threaded rod 36 has
Two nuts 37, 37 are screwed on.
A long groove 38a in the middle of the handle 38 is fitted into a portion of the threaded rod 36 between the two nuts 37, 37. As a result, the handle 38 is loosely fitted and supported on the threaded rod 36 so as to be freely rotatable and movable along the length direction of the long groove 38a. One side of the handle 38 is an operating part 38b that can be bent, and the other part is provided with the belt 2 by operating the handle 38.
A tension roller 39 for tensioning the roller 7 is rotatably mounted.

To install such a tension mechanism 28, align the U-shaped base plate 34 with the side of the scaffold body 1, tighten the bolt 35, and tighten the base plate 34.
to be fixed.

Further, the belt 27 is a V-belt, and is stretched between the first pulley 25, the second pulley 26, and the tension roller 39.

Next, the operation of the governor operation test device constructed as described above will be explained.

first. After loosening the nut 37 of the tension mechanism 28 and putting the belt 27 in a relaxed state, the motor connected to the shaft 23 of the first pinion 22 is started. Therefore, the first pulley 25 rotates at a constant speed together with the first pinion 22.

Then, the handle 38 of the tension mechanism 28
The belt 27 is tensioned by the tension roller 39, and the nut 37 is tightened to fix the handle 38. Therefore, the second pulley 26 follows and rotates together with the second pinion 3, and its shaft 4 rotates.

Then, when the slip of the V-belt 27 disappears, an operation test of the governor 1 is performed. Note that, at this time, as described above, the diameters of the first and second pulleys 25 and 26 are set in advance so that the shaft 4 has the required number of rotations. In the case of this embodiment, the shaft 4 is rotated at a speed corresponding to the operating speed of the governor 1, which is activated when the scaffold main body 21, which has a normal lifting speed of 10 m/min, reaches a lifting speed of 24 to 25 m/min. Yo 1st, 2nd
The speed is increased by pulleys 25 and 26.

According to the above test, the shaft 4 of the governor 1 is moved at a speed corresponding to the operating speed of the governor 1 by the motor for lifting and lowering the scaffold body 21 via the first and second pulleys 25, 26 and the belt 27. In addition, the belt 27 can be tensioned by the tension mechanism 28 to prevent it from slipping, so the rotation of the motor can be reliably transmitted to the shaft 4 and the governor 1 can be operated on a trial basis. This allows the governor 1 to be tested accurately and easily by one worker.

After the governor operation test is completed, the first and second pulleys 25, 26, tension mechanism 28, and belt 27 are removed by performing a reverse operation to the above-mentioned installation operation.

By the way, according to the above embodiment, the first and second pulleys 2 are connected to the first and second pinions 22 and 3.
5 and 26 can be attached and detached very easily, and the tension mechanism 28 can be attached and detached from the scaffold body 21 very easily.

Note that the means for attaching the first and second pulleys 25 and 26 and the tension mechanism 28 are not limited to the above embodiments, and for example, the means for attaching the first and second pulleys 25, 26 and the tension mechanism 28 are The pulleys 25 and 26 may be fixedly attached to the shafts 23 and 4, and the tension mechanism 28 may be fixedly attached to the scaffold body 21, etc., as desired.

As explained above, according to the governor operation test device for a lifting scaffold according to the present invention, the following various excellent effects can be achieved.

A first pulley that is directly connected to the lift motor and a second pulley that is directly connected to the governor shaft are connected to the second pulley when the lift motor that is directly connected to the first pulley rotates at a constant speed. Each diameter is set to increase the rotation speed of the directly connected shaft to the speed that reaches the operating speed of the governor, so the rotation speed of the motor at the normal lifting speed of the scaffold body is equivalent to the operating speed of the governor. The speed can be increased to rotate the shaft at a predetermined speed, and the governor can be accurately tested at a predetermined speed. In other words, the diameter of each of the first and second pulleys is set so that when the motor is rotated at a constant speed, the rotation of the governor shaft increases to the required rotation speed. Effective use of the motor can be achieved and governor tests can be easily performed.

The tension mechanism that tensions and loosens the belt is composed of a board that is attached to the scaffold body, a handle that is movably loosely fitted to the board, and a tension roller that tensions the belt by operating the handle. Therefore, by operating the handle, the belt can be easily tensioned to a state where it will not slip, and uneven rotation can be prevented. Moreover, since the belt can be loosened by operating the handle of the tension mechanism, it is easy to attach and detach the belt, and the test operation can be easily set up, increasing the work efficiency of the governor test. be able to.

As a result of the above, it is possible to test the governor by effectively utilizing the motor that drives the scaffold body up and down, and it is possible to test the governor accurately and in a short time by one worker. can. Moreover, since the governor is actuated by operating the motor, there is no difference between individuals, and the governor test can be carried out very easily without requiring any special skill.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a governor in an elevating scaffold, Fig. 2 is a front view of the main parts of the elevating scaffold showing the state before installation of the test device according to the present invention, and Fig. 3 is a view taken in the direction of the arrow in Fig. 2. , FIG. 4 is a view similar to FIG. 2 showing an installed embodiment of the present invention, FIG. 5 is a view taken in the direction of the arrow in FIG. 4, FIG. 6 is a front view of the first pulley, and FIG. The figure is a side view of the first pulley and its attachment, Figure 8 is a side view of the second pulley, Figure 9 is a front view of the handle in the tension mechanism, and Figure 10 is a view taken in the direction of the X arrow in Figure 9. , FIG. 11 is a side view of the board in the tension mechanism, and FIG. 12 is a side view of the board in the tension mechanism.
It is a view taken along arrow XII in the figure. 1... Governor, 2... Rack, 3... Second pinion, 4... Shaft, 21... Scaffolding body,
22...first pinion, 23...shaft, 2
5...First pulley, 26...Second pulley, 2
7...Belt, 28...Tension mechanism, 34...
... Board, 38... Handle, 39... Tension roller.

Claims (1)

[Claims] 1. A scaffolding body 21 is provided with a pedestal with a rack 2 provided along the vertical direction and a scaffold body 21 that is attached to the pedestal so as to be able to rise and fall freely. the first racks respectively meshing with said racks 2 in a configuration attached to said racks 2;
A pinion 22 and a second pinion 3, a motor to which the first pinion 22 is connected, and a governor 1 to which the second pinion 3 is connected are installed, and the rotation of the first pinion 22 is The governor operation test device in an elevating scaffold is configured such that the scaffold main body 21 is moved up and down by driving and the governor 1 is actuated by the rotation of the second pinion 3, wherein the first pinion 22 a first pulley 25 attached to the shaft of the second pinion 3; a second pulley 26 attached to the shaft of the second pinion 3;
a belt 27 that connects the pulleys 26, and a tension mechanism 28 that is provided on the scaffold main body 21 and that can tension and loosen the belt 27, and the tension mechanism 28 that connects the first and second pulleys 25, 26.
are configured such that when the motor directly connected to the first pulley 25 is rotated at a constant speed, the rotation of the shaft 4 directly connected to the second pulley 26 is increased to a speed that reaches the operating speed of the governor 1. The tension mechanism 28 has a fixed diameter, and the tension mechanism 28 has a base plate 34 attached to the scaffold body 21, and a handle 3 that is loosely fitted and supported on the base plate 34 so as to be movable.
8 and a tension roller 39 for tensioning the belt 27 by operating the handle 38.