JPH041280Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention [Industrial field of application] This invention is useful for inspection and repair work of tall machines installed indoors, such as automatic exchange machine rooms and distribution board rooms at telephone offices. This invention relates to a mobile ladder for indoor work that is movably installed along the front of automatic exchange machines, distribution boards, etc.

[Conventional technology]

Conventional mobile work ladders installed in the automatic exchange machine rooms and distribution panel rooms of telephone offices had their upper ends supported by a trolley with a brake on a ceiling-mounted rail, and wheels attached to their lower ends.

When working by climbing a ladder, the worker operates the ladder according to the following steps.

(1) Release the brake by manually unlocking the brake lever.

(2) Manually push the ladder to the working position.

(3) Secure the ladder by pulling the brake lever by hand to apply the brake.

(4) Climb the ladder to the required height and perform wiring work or testing and inspection work.

Once the work at that location is complete, (5) Descend the ladder.

(6) Unlock the brake lever and release the brake.

(7) Push the ladder by hand to move it to the next working position.

(8) Apply the brake manually again to lock the ladder in position.

This procedure was repeated thereafter.

[Problem that the invention attempts to solve]

The above-mentioned mobile ladders are used extremely frequently in the automatic exchange machine room and distribution panel room of telephone offices, and as shown in the above procedure, it takes time to move and climb up and down the ladder, resulting in a large loss of working time and labor.

If the work is congested or urgent, it may be possible to omit the prescribed operating procedures and move/climb/descend, which is not desirable in terms of work safety.

The object of the present invention is to solve the above-mentioned problems with conventional mobile ladders for indoor work, and to provide a mobile ladder that ensures work safety and improves work efficiency.

B. Composition of the invention [Means for solving the problem] In order to achieve the above-mentioned purpose, the invention has its upper end supported by a trolley 3 with brake 2 on a ceiling-mounted rail 1, and wheels 4, 4 attached to its lower end. On ladder 5,
A linear electromagnetic actuator 6 for brake operation and an electric motor 7 with a speed reducer for wheel drive are provided, and collectors 9, 9 provided on the trolley 3 are connected to power lines 8, 8, which are wired parallel to the ceiling-mounted rail 1. Then, a circuit is provided in the ladder 5 that energizes the linear electromagnetic actuator 6 for operating the brake and the electric motor 7 with a reduction gear for driving the wheels. A forward switch 12 and a reverse switch 13 in series with the switch 10 and in parallel with each other are arranged on the other handrail 11R, and each switch 10, 12,
13 is closed by grasping it together with the handrails 11L and 11R.

[Effect]

The brake 2 is applied when the ladder 5 is at rest, as in the case of conventional mobile ladders.

(1) When you hold the main switch 10 and forward switch 12 together with the left and right handrails 11L and 11R,
As the piston of the linear electromagnetic actuator 6 moves forward (arrow A) and the brake 2 is released,
The electric motor 7 is activated, the wheels 4 rotate in the forward direction, and the ladder 5 moves forward (arrow F). The above operations may be performed after climbing the ladder 5 or while standing on the floor.

(2) Once you have reached the designated working position, remove at least one hand from the handrail 11L or 11R, and the circuit will open, the electric motor 7 will stop, the wheels 4 will stop, and the piston of the linear electromagnetic actuator 6 will stop. returns and brake 2 is applied.
Work on ladder 5 in this position.

(3) When moving to the next work position after finishing the work, remain on the ladder 5 and turn the main switch 10 and forward switch 12 in the same way as above.
is to be held together with handrails 11L and 11R,
Can be moved into place. When moving backward, the main switch 10 and the reverse switch 13 are held together with the handrails 11L and 11R.

〔Example〕

The ceiling installation rail 1 is fixed to the ceiling C with a hanger 14. Along the rail 1, rail-shaped power supply lines 8, 8 are also arranged by hangers 14. The current collectors 9, 9 are in slidable and elastic contact with the power supply lines 8, 8.

The brake 2 and a linear electromagnetic actuator 6 for operating the brake 2 are connected to a lever 15 for operating the brake 2 and a piston of the actuator 6 by a link rod 1.
6 and linked together.

A linear electromagnetic actuator 6 for operating the brake and an electric motor 7 with a reduction gear for driving wheels are fixed to the ladder 5 by brackets 17 and 18, respectively. The rotation of the deceleration output shaft of the motor 7 is transmitted to the wheels 4 by a timing belt transmission mechanism 19.

The linear electromagnetic actuator 6 for operating the brake and the electric motor 7 with a reduction gear for driving the wheels are configured such that the motor 7 starts rotating after the brake 2 is completely released by actuation of the actuator 6, in order to prevent breakdowns such as burnout of the motor 7. Further, it is desirable to add a control circuit including a timer, relay, etc. to the circuit so that the actuator 6 is activated and the brake 2 is applied after the motor 7 has completely stopped. A control panel 20 incorporating the control circuit is supported at the bottom of the ladder 5 using steps. As the linear electromagnetic actuator 6, a linear motor or a solenoid can be used.

In this embodiment, a set of main switch 10 and forward/reverse switches 12 and 13 are arranged in parallel at the upper, middle and lower three levels of handrails 11L and 11R, so that they can be operated from any level on the floor or ladder 5. Although it is a thing,
The number of stages installed is arbitrary. and switch 1
0, 12, and 13 can be push-button type switches, and the mounting positions on the circumferential surfaces of handrails 11L and 11R should be selected so that the switch button can be reliably pressed with the hand when grasping the handrail. be.

The ceiling installation rail 1 and the power supply lines 8, 8 parallel to the rail 1 are covered by a duct which is not shown in the figure. In the figure, M indicates an automatic exchange machine.

Although the embodiment has been described by exemplifying a mobile work ladder in an automatic exchange machine room of a telephone office, the present invention can also be applied to mobile work ladders in other machine rooms. The present invention can be easily modified to existing mobile ladders for indoor work.

C. Effects of the invention Since the mobile ladder for indoor work of the invention has the above-mentioned configuration, the brake 2 is released and activated and the wheels 4 are rotated and stopped by controlling the linear electromagnetic actuator 6 and the electric motor 7. It is possible,
What's more, you can operate it while climbing the ladder 5, climbing up and down the ladder each time you move.
There is no need to push or pull the ladder by hand. Therefore, working time is shortened, and there is no wasted effort, which has the effect of improving work efficiency.

A main switch 10 and a forward/reverse switch 1 control the linear electromagnetic actuator 6 for brake operation and the electric motor 7 with a reduction gear for driving wheels.
2 and 13 cannot be operated unless the left and right handrails 11L and 11R are firmly grasped at the same time with both hands, so there is no need to worry about braking or moving while climbing the ladder 5. Furthermore, since the linear electromagnetic actuator 6, especially the linear motor, operates slowly, there is no shock when the brake 2 is released and activated, and the brake operates smoothly and reliably.
Coupled with ensuring that the handrails 11L and 11R are always grasped with both hands, this is effective in ensuring work safety.

[Brief explanation of the drawing]

Fig. 1 is a front view of the movable ladder for indoor work according to the present invention, and Fig. 2 is a side view thereof. 14...Rail and power line hanger, 15...
...Brake lever, 16...Link rod, 19
...Transmission mechanism.

Claims (1)

[Scope of utility model registration request] A ladder 5 whose upper end is supported by a trolley 3 with a brake 2 on a ceiling-mounted rail 1 and wheels 4, 4 are attached to its lower end is equipped with a linear electromagnetic actuator 6 for operating the brake and an electric motor 7 with a reducer for driving the wheels. , from the power lines 8, 8 wired parallel to the ceiling-mounted rail 1, to the current collectors 9, 9 provided on the trolley 3.
The ladder 5 is equipped with a circuit that energizes the linear electromagnetic actuator 6 for brake operation and the electric motor 7 with a reduction gear for driving the wheels, and the main switch 10 connected to the circuit is connected to the handrail 11 on one side of the ladder 5.
L, and a forward switch 12 and a reverse switch 1 in series with the main switch 10 and in parallel with each other.
3 on the other handrail 11R, and each switch 1
A movable ladder for indoor work that is configured to be closed by grasping the handles 0, 12, and 13 together with the handrails 11L and 11R.