JPH063998Y2 - Electric mobile ladder - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an electric mobile ladder, and is particularly installed for facilitating work at a high place in a room such as an automatic exchange machine room of a telephone office. Related to the improvement of electric mobile ladder.

[Conventional technology]

Generally, when performing inspection and repair work in the automatic exchange machine room or wiring board room of a telephone office, the range of work to the automatic exchanges and wiring boards arranged along the passage extends from low places to high places. A moving ladder is used.

In the conventional electric mobile ladder, a rail is erected on the indoor ceiling above the passage along the front of the automatic exchange or the wiring board, and the upper end of the ladder main body is connected to and supported by this rail. The structure is such that wheels are attached to the lower end for running on the floor. Such a ladder is used so that it is pushed by a hand and moved to a work place along a rail, and climbs the ladder to perform work. However, such a ladder is very inconvenient because a worker needs to go down from the ladder and push it by hand when moving. In particular, this kind of ladder is provided with a braking means, and it is indispensable to lock and unlock it, and it is a repetition of work such as raising and lowering the ladder, locking or unlocking the brake, and pushing and moving the ladder. It was very inconvenient when there were several inspection and repair points apart.

Therefore, in order to improve the above inconvenience,
As disclosed in Japanese Patent No. 000, a structure has been proposed in which the lower wheels of the ladder are motor-driven wheels so that they can be moved while riding on the ladder. In this system, a ladder is driven by a push button switch provided on a handrail to operate a motor so that an operator does not have to descend from the ladder.

[Problems to be solved by the invention]

However, even if you move it while riding on the ladder, if there is a difference in height at the work site, you have to move the ladder up and down to the push button switch in the fixed position, which is fixed on the ladder. It was complicated by setting the switch at the position. In the technique described in the above publication, a plurality of switches are provided by changing the height position, but even in this case, there is a drawback that the switch must be provided for each different height.

The present invention focuses on the above-mentioned conventional problems, and allows the operator to operate the switch regardless of the position of the operator on the ladder, thereby enabling the ladder to be moved without wasteful operation, and moreover, a plurality of switches can be installed. It is an object of the present invention to provide an electric mobile ladder having a simple structure that is unnecessary.

[Means for solving problems]

In order to achieve the above object, the electric moving ladder according to the present invention is provided with an electric drive wheel mechanism at the lower end of the ladder main body, and the upper end is supported by a ceiling erection rail to enable movement along the rail. In the electric movable ladder, a handrail provided on the ladder main body is rotatably attached, and a drive switch of the electric drive wheel mechanism is connected to the handrail so that the drive switch can be turned on and off by rotating the handrail. ing.

In addition to this, the drive switch is composed of a drive main switch and a moving direction changeover switch connected in series to the drive main switch, and the drive switches are separately arranged at the upper ends of both handrails of the ladder, and are operated by rotating both handrails. The switch may be turned on. A rotary switch is used as the drive switch, and it can be turned on and off by connecting it to the end of the handrail, but it is not limited to the rotary switch and any type can be used as long as it is linked to the rotating operation of the handrail. .
The handrail should be constructed so that it can rotate almost the entire range, and it is attached to the support part to the ladder body as a cylindrical structure,
The neutral return spring of the switch is used to allow the handrail to return to the neutral position. Of course, it goes without saying that the handrail itself can be provided with a restoring mechanism for returning to a fixed position. Further, if a brake mechanism is separately provided on this electric moving ladder, a brake operating mechanism is additionally required. Therefore, in the present invention, in the electrically driven wheel mechanism, the rotation transmission mechanism between the drive source and the wheel has a worm wheel structure. The rotation transmission from the wheel side is blocked to make this type of ladder convenient as an automatic braking structure.

[Action]

In the electric movable ladder according to the present invention configured as described above, the worker rides on the ladder and holds the handrail with both hands, rotates the handrail on the drive main switch side, and moves the handrail on the other moving direction changeover switch side. It can be automatically moved by rotating in one direction at the same time. Moreover, since the drive operation can be performed at any position of the ladder by grasping the handrail, it is not necessary to move up and down in the ladder each time it is moved, and the movement operation can be performed very easily and the workability can be improved. Since the entire handrail is rotated, only one operation switch needs to be installed on each handrail, and the number of parts may be small, which is structurally simple. In particular, in the present invention, the main switch and the moving direction changeover switch are connected in series, and the worker does not move unless the operator grips the handrail with both hands and does not perform the rotating operation, so that it has a safety structure. Further, the drive wheel mechanism is a worm wheel mechanism, which is a non-reciprocal rotation transmission mechanism, and therefore has a constant braking structure. Therefore, the brake is in the stopped state, and the brake is not released unless the operator rotates the both handrails.
This configuration also makes the mobile ladder safer.

〔Example〕

Hereinafter, embodiments of the electric mobile ladder according to the present invention will be described in detail with reference to the drawings.

FIG. 1 is an external perspective view of the electric mobile ladder of the embodiment. As shown in the figure, the electric mobile ladder 10 is provided with a ladder main body 14 in which treads 12 are provided in multiple stages, and the upper end of the ladder main body 14 has a ceiling inside a room such as an automatic exchange machine room of a telephone office. A hanging support portion 18 is provided which is engaged with a ceiling erection rail 16 stretched over the rail and guided for traveling. The suspension support 18 is an inverted U connecting the both side plates 20 of the ladder body 14.
The frame 22 has a V-shape, and a bracket 24 attached to the central portion of the frame 22 and extending so as to sandwich the ceiling erection rail 16. Guide wheels (not shown) traveling on the ceiling erection rail 16 are attached to the bracket 24, and the guide wheels are moved along the rail. In addition, at the lower end of the ladder body 14, wheels for running on the floor are
26 is provided, and the wheel 26 is rotatably driven by an electric drive unit 28 provided on the lower rear surface of the ladder body 14. The wheels 26 and the electric drive unit 28 form an electric drive wheel mechanism. Although not shown, the electric drive unit 28 has a built-in battery and motor,
The worm wheel gear mechanism is adopted as the rotation transmission mechanism to 26. This prevents the rotation from the wheel 26 side from being transmitted to the motor side when the motor is de-energized,
The electric moving ladder 10 is configured to exert a braking action when it is not driven.

By the way, a switch mechanism is provided in the ladder main body 14 in order to operate the electric drive unit 28, which is configured as follows. That is, a handrail 30 is provided on the ladder main body 14 for safety when an operator moves up and down, but when the handrail 30 is attached to the handrail support 32 provided on the side plate 20 of the ladder main body 14, the handrail support 32 is provided. On the other hand, it is attached so that it can rotate. This is the second
As shown in the figure, the upper handrail support part 32A and the lower handrail support part 3 which are raised from the side plate 20 are provided on the upper part and the lower part of the side plate 20, respectively.
The handrail 30 as a cylindrical body is attached to the 2B, and the handrail 30 can freely rotate. The handrail 30 is a long cylindrical body that covers almost the entire length of the ladder body 14 so that an operator can grip the ladder body 14 in the range of raising and lowering. A main switch for operating the electric drive unit 28 is provided at the upper end of the handrail 30.
34 is attached to one of the handrails 30 side, and the movement direction changeover switch 36 is also attached to the other handrail 30 side. Rotary switches are used as the switches 34 and 36, and are operated in association with the rotation of the handrail 30.

FIG. 3 shows the configuration of the operation circuit between the electric drive unit 28 and the switches 34 and 36 described above. First, a main switch 34 is attached to one of the handrails 30, and the main switch 34 has a contact SW1 that is turned on even when the handrail 30 is rotated from the neutral position to either the left or the right direction. . One terminal of the contact SW1 is connected to the positive electrode terminal 38 of the battery, and the other terminal is a pair of first and second parallel-connected terminals.
It is connected to the negative electrode terminal 44 of the battery via the relay coils 40 and 42. Further, the moving direction change-over switch 36 connected to the other handrail 30 has a forward contact SW2 and a backward contact S.
It is equipped with W3, and the forward contact SW2 is turned on by rotating the handrail 30 to one side, and the backward contact SW3 is turned on by rotating the handrail 30 in the opposite direction. The forward contact SW2 is connected between the first relay coil 40 and the battery negative terminal 44, and the backward contact SW3 is connected between the second relay coil 42 and the battery negative terminal 44.

The battery terminals 38 and 44 are connected to the wheels via a polarity reversing circuit 46.
Twenty-six drive motors 48 are connected. The polarity reversing circuit 46 connects a pair of relay contacts 401 and 402, which are closed by the excitation of the first relay coil 40, to the battery and the positive terminal of the motor 48, and to the negative terminal circuit, while the second relay coil 42 is connected. A pair of relay contacts 42 that are closed by excitation
1, 422 are connected between the battery positive terminal 38 and the motor negative terminal and between the battery negative terminal 44 and the motor positive terminal. Therefore, the main switch contact SW1 and the forward contact SW2
When the main switch contact SW1 and the reverse contact SW3 are simultaneously closed, the motor 48 rotates in the reverse direction and the ladder 10 moves forward or backward, respectively. Further, by exciting the first relay coil 40, the second relay coil 40
A normally-closed relay contact 403 is connected in series with the forward contact SW2 to prevent current from flowing through 42, and similarly with the backward contact SW3 in series so as to prevent current from flowing through the first relay coil 40 due to excitation of the second relay coil 42. A normally closed relay contact 423 is connected. A relay contact 50 is connected to the main switch contact SW1 in series so that the operation circuit does not work when the battery is charged. Reference numeral 52 in FIG. 3 denotes a light that is turned on when the motor is driven.

The operation of the electric mobile ladder 10 configured as described above is as follows. While the worker is on the ladder body 14, both handrails 30
If you grab and rotate the handrail 30 to the outside at the same time, the main switch contact SW1 and the forward contact SW2 are turned on,
The 48 rotates forward and the ladder 10 moves forward. Conversely, if both handrails 30 are rotated inward at the same time, the main switch contact SW1
And the reverse contact SW3 are turned on, the motor 48 rotates in the reverse direction and the ladder 1
0 means to move backward. At this time, since the switches 34 and 36 are connected to the handrail 30, it is possible for the operator to move the operator regardless of which position of the ladder body 14 is standing on the footboard 12, and the operator wastefully moves the ladder 10 above the ladder 10. The ladder 10 can be moved without moving up and down.

Therefore, in the above-described electric moving ladder, since the entire handrail 30 has the switch mechanism, the motor can be driven for movement at any position on the ladder, workability is improved, and work points are scattered. Since there is no useless movement at this time and both handrails 30 are gripped to move, a safe electric moving ladder 10 can be provided.

[Effect of device]

INDUSTRIAL APPLICABILITY As described above, the present invention relates to an electric moving ladder in which an electric drive wheel mechanism is provided at the upper end of the ladder main body, and the upper end is supported by a ceiling erection rail so as to be movable along the rail. Rotatably attached to a pair of handrails, one of the handrails is connected to the drive main switch of the electric drive wheel mechanism, and the other handrail is connected in series with the main switch to drive wheels. The movement direction changeover switch of the mechanism is connected so that the drive switch and the movement direction changeover switch are turned on and off by the rotation of the handrail,
And since the electric drive wheel mechanism has an irreversible rotation transmission mechanism consisting of a worm wheel gear and has an automatic braking structure, the number of switch parts can be reduced and the operation can be performed at any position of the ladder, and the operator can operate it. The moving operation can be performed only with the handrails held by both hands, and in particular, when the moving operation is not performed without the provision of the braking means, the brake is always applied. can get.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an external perspective view of an electric mobile ladder according to an embodiment, FIG.
FIG. 3 is a sectional perspective view of the handrail portion, and FIG. 3 is an operation circuit diagram. 10 …… Electric mobile ladder, 14 …… Ladder body, 16 …… Ceiling rail, 18 …… Suspending support, 26 …… Wheels, 28 …… Electric drive, 30 …… Handrail, 32 …… Handrail support Department, 34 ……
Main switch, 36 …… Switch for moving direction.

Claims (1)

[Scope of utility model registration request] 1. An electric moving ladder in which an electric drive wheel mechanism is provided at a lower end of a ladder main body, and an upper end is supported by a ceiling erection rail so as to be movable along the rail, which is provided in the ladder main body. Two pairs of handrails are rotatably mounted, one of the handrails is connected to a drive main switch of the electric drive wheel mechanism, and the other handrail is connected in series with the main switch and is in a moving direction of the drive wheel mechanism. A changeover switch is connected so that the main switch and the moving direction changeover switch are turned on and off by rotation of the handrail, and the electric drive wheel mechanism has a non-reciprocal rotation transmission mechanism composed of a worm wheel gear to automatically brake. An electric mobile ladder characterized by its structure.