JP2582485B2 - Electric lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-driven lifting device for raising and lowering electric equipment such as lighting equipment and speakers installed at a high place such as a gymnasium or a factory ceiling.

[0002]

2. Description of the Related Art Electrical equipment installed in a high place such as a gymnasium or a factory ceiling is provided so as to be able to move up and down so that maintenance and inspection can be easily performed.

[0003] As shown in Fig. 4, a conventional electric hoisting apparatus has an elevator main body (not shown) installed on a ceiling or the like, and an electric motor (not shown) and a wire 1 driven by a forward / reverse rotation of the motor in the main body. A winding drum (not shown) for winding and unwinding is provided, and a lifting / lowering unit 2 provided with an electric device (not shown) is connected to the wire 1 fed from the winding drum.

A plurality of elevating contacts 3 connected to electrical equipment are provided on the upper surface of the elevating portion 2 so as to be able to move up and down, and the elevating contacts 3 are urged upward by springs 4. ing.

A movable plate 5 is supported by the lifting device main body so as to be movable up and down, and is urged downward by a spring 6. A power supply contact 8 to which a lead wire 7 for supplying power is connected is provided on the lower surface of the movable plate 5 so as to be able to contact the movable contact 3 of the lifting unit 2.

A detection lever 9 is provided above the movable plate 5.
Are supported so as to be swingable about the support shaft 10. One end of the detection lever 9 is brought into contact with the center of the upper surface of the movable plate 9 and is urged by a spring 11 to rotate clockwise in the figure.

Further, a switch 12 is provided facing the other end of the detection lever 9, and this switch 12 is activated when the detection lever 9 is rotated to stop supplying power to the electric motor.

When the lift 2 is raised by the drive of the electric motor, the contact 3 of the lift is connected to the power supply contact 8 of the movable plate 5.
And the movable plate 5 is pushed upward against the spring 6. The detection lever 9 rotates with the rise of the movable plate 5, and the switch 12 is operated by the detection lever 9, so that the drive of the electric motor is stopped, and the lift 2 is stopped at the fixed position.

[0009]

By the way, in order to equalize the contact pressure between the lifting / lowering section contact 3 and the power supply contact 8, a spring 4 is used for the lifting / lowering section contact 3 and a spring 6 is used for the power supply contact 8. doing. Therefore, the lifting unit 2 and the movable plate 5 are supported via the springs 4 and 6. Therefore, when the elevating unit 2 is lifted, the elevating unit 2 suspended by the wire 1 is shaken.
When the lifting / lowering unit contact 3 comes into contact with the power supply contact 8, the movable plate 5
Also, if the rising position of the movable plate 5 is simply detected, the stop position varies due to the influence of the vibration.

Therefore, conventionally, the detection lever 9 is used,
By contacting one end of the detection lever 9 with the center of the movable plate 5 where the movable plate 5 touches the least, the influence of the swing of the movable plate 5 is reduced.

However, the use of the detection lever 9 complicates the structure, requires parts such as the support shaft 10 and the spring 11, requires a large number of parts, and requires a lot of labor for assembly. Moreover, by interposing the detection lever 9 between the movable plate 5 and the switch 12, the switch 12
Is poor in response, and the ascending / descending position of the elevating unit 2 tends to vary.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides an electric hoisting apparatus which can simplify the structure and facilitate assembly, and can accurately stop the elevating part at a fixed home position. The purpose is to do so.

[0013]

SUMMARY OF THE INVENTION According to the present invention, there is provided an elevating device main body disposed at a fixed position, an electric motor disposed in the elevating device main body, and winding and rewinding of the wire by forward and reverse rotation of the electric motor. A winding drum to be fed and an electric device and an elevating unit contact connected to the electric device on the upper surface, and a lift connected to the wire fed from the winding drum and moved up and down by winding and feeding the wire A movable plate having a power supply contact on the lower surface, which is supported in the elevating device main body so as to be vertically movable and is urged by a spring in a descending direction, and contacts the elevating unit contact when the elevating unit is raised, A guide body that guides the elevating unit to rise in parallel in the process of contacting the elevating unit contact of the elevating unit with the power supply contact of the movable plate; and a switch operating unit integrally provided on the movable plate. When the elevating unit is raised by driving the electric motor, the elevating unit contact is brought into contact with the power supply contact, and is operated by the switch operating unit at the ascending fixed position where the movable plate is pushed up to stop the electric motor. And a lifting stop switch.

[0014]

According to the present invention, when the elevating unit is raised into the main body of the elevating device when the elevating unit is raised by driving the motor, the elevating unit is first guided by the guide body so as to be raised in parallel. Thereafter, the elevating section contact of the elevating section comes into contact with the power supply contact of the movable plate, and the elevating section and the movable plate rise together against the spring. Then, a switch operating unit integrally provided on the movable plate operates the ascent / stop switch. The operation of the ascent stop switch stops the drive of the motor,
The lifting unit is stopped at the fixed position.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

In the figure, reference numeral 21 denotes a lifting apparatus main body, which is installed at a high place such as a gymnasium or a factory ceiling.

An electric motor 22 is mounted in the elevating device main body 21, and a winding drum 23, which is normally and reversely rotated by the electric motor 22, is supported rotatably forward and backward. The take-up drum 23 has a pair of take-up sections 24, each end of one wire 25 is connected to each take-up section 24, and takes up and feeds out the wire 25 by forward / reverse rotation.

The wire fed from the winding drum 23
Reference numeral 25 denotes a slack detecting means 26, a guide pulley 27 rotatably attached to the elevating device main body 21, and a lock case 41 described later.
Is drawn out below the elevating device main body 21 via direction changing pulleys 28 attached to both sides of the lifting device.

Reference numeral 31 denotes an elevating unit, which is connected to a wire 25 led out below the elevating device main body 21, and is moved up and down by winding and unwinding operation of the wire 25. The elevating unit 31 includes a cylindrical case 32, and a lighting device 34 having a lamp 33 as an electric device is attached to a lower surface of the case 32. On the upper surface of the case 32, a plurality of elevating section contacts 35 electrically connected to the lighting fixture 34 are provided so as to be able to move up and down.
A spring 36 is fitted in and is urged upward. In addition, locking projections 37 project from both sides of the case 32.

The lock case 41 is configured as a guide body that guides the elevating unit 31 to rise in parallel in the process of contacting the elevating unit contact 35 of the elevating unit 31 with a power supply contact 48 of the movable plate 45 described later. ing. That is, it is formed in a box shape that opens downward, and notches 42 are formed on both side surfaces, and the elevating unit 31 is in parallel with the peripheral surface of the case 32 of the elevating unit 31 on both side edges of the notch 42. Guide part 43 that guides ascending and descending
Are formed, and the elevating unit 31 is
The introduction portion 44 for introducing the water is formed in an expanded shape toward the lower side. Then, the guide section 43 is provided with the lift section contact 35 of the lift section 31.
Before the contact with the power supply contact 48 of the movable plate 45, the upper surface of the elevating unit 31 is formed in a dimensional relationship in which the upper end of the peripheral surface comes into contact.

A movable plate 45 is provided in the lock case 41. The movable plate 45 is supported by a plurality of rods 46 provided on the lock case 41 so as to be vertically movable.
Each of the rods 46 is urged in a downward direction by a spring 47 fitted thereto. The movable plate 45 is provided with a power supply contact 48 with which the lifting / lowering portion contact 35 contacts when the lifting / lowering portion 31 is raised, and a switch operating portion 49 that projects vertically from the side of the lock case 41 is integrally formed. Is provided.

A lifting stop switch 52 having a contact 51 penetrating into a rising area of the switch operating portion 49 is provided in the lifting device main body 21 by a bracket (not shown) or the like. When the lifting / lowering unit 31 is raised by driving the electric motor 22, the lifting / stopping switch 52 is in a raised position where the lifting / lowering unit contact 35 contacts the power supply contact 48 and pushes up the movable plate 45. Actuated by pushing the contact 51, the electric motor 22 is stopped.

A lock claw which is engaged with and disengaged from a locking projection 37 of the elevating unit 31 is provided between lower portions on both sides of both notches 42 of the lock case 41.
A support shaft 56 provided with 55 is provided so as to be selectively rotatable.

Next, the operation of this embodiment will be described.

When the lifting unit 31 is lowered, the winding drum 23 is driven by the electric motor 22 as shown in FIGS.
The wire 25 is fed out from the, and the elevating unit 31 descends. Then, when the lifting unit 31 descends on the floor surface or the like and the wire 25 becomes slack, the slack detecting means 26 detects the slack and the electric motor 22 is stopped.

When the elevating unit 31 is raised, the wire 25 is wound around the winding drum 23 by driving the electric motor 22, and the elevating unit 31 is raised.

First, the upper end of the peripheral surface of the elevating unit 31 contacts the guide unit 43 through the introduction unit 44 of the lock case 41,
The swing of the elevating unit 31 is suppressed, and the ascending unit 31 rises substantially in parallel.

Subsequently, the plurality of elevating section contacts 35 of the elevating section 31 contact the corresponding power supply contacts 48 of the movable plate 45. Thereafter, the elevating unit 31 and the movable plate 45 move upward integrally against the spring 47.

The locking projection 37 of the elevating section 31 is
The lifting section 31 moves upward while rotating the lock claw 55 outward.

When the elevating unit 31 reaches the ascending fixed position, the switch operating unit 49 of the movable plate 45 is operated by the ascending stop switch 52.
Contact switch 51, the ascent / stop switch 52 operates,
The electric motor 22 is stopped.

At this time, the swinging of the elevating unit 31 is suppressed by the guide unit 43, and the movable plate 45 ascends substantially in parallel with the elevating unit 31. Therefore, the ascending and descending is stopped by the switch operating unit 49 provided integrally with the movable plate 45. By operating the switch 52, the elevating unit 31 can be accurately stopped at the fixed home position.

In the fixed position, the lock claw 55 is engaged with the lower part of the locking projection 37 of the elevating unit 31 to prevent the elevating unit 31 from dropping. The lock claw 55 is detached from the locking projection 37 when the elevating unit 31 descends.

[0033]

According to the present invention, when the elevating unit is lifted, first, the swing of the elevating unit is guided by the guide body so as to ascend in parallel, and then the elevating unit contact of the elevating unit is moved by the movable plate. Contact with the power supply contact, and the elevating unit and the movable plate rise together, so that the movable plate can be integrally provided with a switch operating unit for operating the ascent / stop switch. The structure can be simplified, the assembling can be easily performed, and the elevating unit can be accurately stopped at the ascending fixed position.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an embodiment of an electric lifting device according to the present invention.

FIG. 2 is a perspective view thereof.

FIG. 3 is a partial side view.

FIG. 4 is a side view of a conventional electric lifting device.

[Explanation of symbols]

 21 Lifting device main unit 22 Motor 23 Winding drum 25 Wire 31 Lifting unit 34 Electrical equipment 35 Contact of lifting unit 41 Guide body 45 Movable plate 47 Spring 48 Power supply contact 49 Switch operating unit 52 Lift stop switch

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-64205 (JP, A) JP-A-1-236510 (JP, A) JP-A-61-168802 (JP, A) JP-A-62 219405 (JP, A) Fully open 1988-128614 (JP, U) Fully open 1987-139015 (JP, U) Fully open 1987-160410 (JP, U) Fully open 1988-54521 (JP, U) Jiko 56-43937 (JP, Y2)

Claims (1)

(57) [Claims] A lifting device main body disposed at a fixed position;
An electric motor disposed in the lifting device main body, a winding drum for winding and feeding out a wire by forward and reverse rotation drive of the electric motor, and an electric device and an elevating portion contact connected to the electric device are provided on an upper surface. A lifting / lowering unit connected to the wire fed from the winding drum and raised / lowered by winding and feeding the wire, and supported in the lifting / lowering device main body so as to be vertically movable and urged by a spring in a downward direction. A movable plate provided on the lower surface with a power supply contact with which the lifting / lowering portion contact comes into contact when the lifting / lowering portion is raised; A guide body for guiding the ascending portion, a switch operating portion integrally provided on the movable plate, and a contact portion of the elevating portion when the elevating portion is raised by driving the electric motor. Electric lifting device being characterized in that a rising stop switch for stopping been actuated motor by the switch operating section of the movable plate in the push-up clogs raised position while in contact with the conductive contacts.