JPH079894Y2 - Lifting device for lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention mainly relates to an elevating device for electrically setting a lighting fixture or the like on a ceiling.

(Prior Art) Conventionally, as this type of lifting device, a winding device that winds a wire around the lifting device body mounted on the ceiling and a lighting fixture that is raised and lowered by the wire are hung under the lifting device body. There is a type in which an elevating body is provided, and a lock rod provided at the center of the upper part of the elevating body is inserted into a guide tube provided on a mounting base on the main body side and can be held by a stopper.

(Problems to be solved by the invention) However, in an elevating device in which a lock rod attached to an elevating body is inserted and held in a guide tube on the main body side, shaking of a lighting fixture or the like occurs when winding the elevating body. The tip of the lock bar may not enter the entrance of the guide tube on the main body side due to inclination or the like. Therefore, there is a problem in that the lifting body cannot be locked, and that it rises as it is to cause an obstacle to the main body or the like.

The present invention has been made in view of the above problems of the conventional technique, and an object of the present invention is to provide an elevating device that prevents the occurrence of the above-mentioned obstacles.

(Means for Solving the Problems) In order to achieve the above object, the lifting device according to the present invention comprises a winding device that winds a wire around a lifting / lowering device body mounted on a ceiling, and a lifting / lowering device that lowers and lowers the lifting device body by a wire. In an elevating device that is provided with an elevating body that suspends lighting equipment, etc., and a lock rod provided at the center of the upper part of the elevating body can be inserted into a guide tube provided on a mounting base on the main body and held by a stopper, A detection lever is provided on the outer periphery of the guide cylinder near the lock rod entrance and exit, and the raising operation of the lifting body is stopped by detecting that the tip of the lock rod contacts the detection lever.

In addition, for the same purpose, it is possible to detect that the tip of the lock rod has come into contact with the detection lever to reverse the raising operation of the lifting body, or to reverse it and automatically raise it again after a certain time. It was done.

(Operation) When the lock bar does not enter the guide tube due to the swinging or tilting of the lifting body during the lifting of the lifting body in this way, if this is detected by the detection lever and the lifting of the lifting body is stopped, The occurrence of failures can be prevented. Also, if it is reversed, the unreasonable state between the lifting body and the main body will be released. When the tilt of the lifting / lowering body returns to normal by reversing, it can be automatically locked by raising it again.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a vertical cross-sectional front view showing a state in which an elevating device from which the lighting equipment of the present invention is removed is lifted illegally. As shown in the figure, the lifting / lowering device main body 1 is horizontally attached to a structure of a building, for example, a ceiling by bolts or the like, and is provided with a winding device such as a motor or a wire winding drum (not shown).
Reference numeral 2 denotes an elevating body, which is an elevating device main body 1 via a pair of rollers 3a.
The wire rod 3 is hung on the lower side of the center of the upper and lower parts, but the lock bar 4 is provided at the center of the upper part of the elevating body 2 so as to stand upward. The lock rod 4 has a conical head 4a and a rod-shaped neck 4b, which can slide vertically on the neck 4b at a constant interval, and has a sleeve 4c having an outer diameter substantially the same as the outer diameter of the head 4a. Is installed. Further, a mounting base 5 is fixed downward to the lifting device main body 1 at a position facing the lock bar 4,
A guide tube 6 that allows the lock bar 4 to move in and out is integrally provided on the mounting base 5, and a stopper 7 having a flat upper end and a sloped lower part so that the lock bar 4 can be held or released at the base thereof. Is urged by a spring 8 so that the lock rod 4 can be always held. Further, the stopper 7 is a head 4a of the lock bar 4 when the lifting body 2 is raised in a normal state.
Then, the stopper 7 is pushed open, and the spring 8 holds the neck 4b of the lock rod 7 to hold the head 4a on the upper plane of the stopper 7 after the rising is stopped, and the locked state is held.

Next, when lowering the lifting / lowering body 2, the lifting / lowering body 2 is once lifted, the lower slope of the stopper 7 is widened by the sleeve 4c, and when the lowering is continued, the sleeve 4c lowers in contact with the head 4a. The stopper 7 remains unfolded, and the lift 2 continues to descend. A switch box 9 is mounted on the mounting base 5 of the lifting / lowering device main body 1, and a limit switch L _{SA to} L _SC group (however, is limited by a slider 10 which is vertically controlled by the lock rod 4).
L _SC is omitted) to automatically move the lifting / lowering body 2 up and down. Details thereof are described in detail in the utility model registration application (A) dated May 25, 1989 and are omitted because they are not the gist of the present invention.

In the above-described structure, when the lifting body 2 swings or tilts while the lifting body 2 is being raised, the lock rod 4 is inserted into the lock rod entrance / exit of the guide tube 6 attached to the mounting base 5 as shown in FIG. It may not enter. If the rise is left as it is, the device will be damaged. Therefore, the detection lever 12 is provided on the outer periphery near the lock rod entrance and exit, and when the lock rod 4 abuts on this detection lever 12, the limit switch L _SE inserted in the circuit to the motor is activated to raise the lifting body 2. It is designed to stop the operation.

Next, if the lifting / lowering body 2 is stopped, it may cause a subsequent failure. Therefore, the lifting / lowering body 2 may be reversed after being detected, and stopped when it reaches the floor surface. An example of the circuit diagram is shown in FIG. That is, in order to raise the lifting body 2, the changeover switch SW
The When put into UP, the relay R ₁ is operated, the contact r ₁ -1 switches the contact r ₁ -2 closed. Then, the motor M operates,
The elevating body 2 rises, but at this time, if the tip of the lock bar 4 pushes the detection lever 12 due to the inclination, the limit switch
L _SE is cut換Ri, the relay R ₃ is operated, the contact r ₃ -1 open, contact r ₃ -2, the r ₃ -3 is closed, the relay R ₂ is also operated by sneak circuit, the contact r ₂ - 2 switches and the motor M starts to descend. When the lift 2 starts to descend, the detection lever
12 is restored and limit switch L _SE is also restored, but contact r ₃
The relay R ₃ is self-held by −2, so the descent continues. And the like thereafter reach the floor surface, the slack of the wire 3 or the like by detecting the limit switch L _SD, contact is switched when the relay R ₄ is operated cut, so the contact r ₄ -1 is opened, relay R ₃ Self-holding is released. Therefore, even if the lifting / lowering body 2 is tilted, it does not rise more than the detection lever 12 is pushed, so that the device can be prevented from being damaged.

Alternatively, after the lifting / lowering body 2 is detected, the lifting / lowering body 2 may be reversed and automatically lifted again after a certain period of time. Third example of the circuit diagram
Shown in the figure. That is, when the changeover switch SW is turned on in order to raise the lifting body 2, the relay R ₁ operates and the contact r _1-
1 is closed and contacts r _1-2 are switched. Then, the motor M
When the tip of the lock bar 4 pushes the detection lever 12 due to tilting or the like, the limit switch L _SE switches, the motor M stops, and the timer relay TR Works. This opens the contact tr-1 and closes the contacts tr-2 and tr-3. When the contact tr-2 is closed, a wrap-around circuit is formed and the relay R ₂ operates. Contact r ₂ -1 closes the relay R ₂ is operated, it switches the contact r ₂ -2. Then, the limit switch L _SE contact − contact tr− 3−
The motor M turns to reverse rotation (DOWN) via the contact r ₂ -2. Then, the detection lever 12 returns to its original state, and the limit switch L _SE also returns to its original state. Incidentally, the contacts for r ₂ -1 is the contact tr-1 be closed are open, self-holding of the relay R ₂ is not formed in the state of this descent. Then, the lifting body 2 descends as it is. After that, when the timer relay TR is cut off after a certain period of time, the contact tr-1 is closed and the contact tr-
2, tr-3 is opened to return the relay R _2, elevation body 2 again I conversion cut the contact r ₂ -2 is starts to rise. In this case, after a certain period of time, the tilting and swaying of the lifting body 2 also returns to normal, so the lifting body 2 is locked in the main body 1.

(Effect of the device) The present invention detects when the lock bar does not enter the lock bar entrance / exit of the mounting base due to swinging or tilting of the lift bar during the ascending / descending motion of the elevating / lowering body, and raises the elevating / lowering body. To prevent damage to the lifting device.

In the lifting device according to the second aspect of the present invention, since it is reversed immediately after stopping, it is possible to prevent the possibility of subsequent damage rather than leaving it in an illegal state.

In the lifting device according to the third aspect of the invention, since the lifting device is reversed for a certain period of time immediately after the stop and is lifted after the tilting or shaking of the lifting body is eliminated, the lifting device can be automatically locked in the normal state.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of the lifting device of the present invention excluding lighting fixtures when the lifting body is lifted illegally, and FIGS. 2 and 3 are views after detecting that the lifting body is lifted illegally. FIG. 6 is a circuit diagram showing a descending or descending re-elevating operation of the elevating body. 1 ... Lifting device main body, 2 ... Lifting body, 3 ... Wire, 4
...... Lock rod, 5 ... Mounting base, 6 ... Guide tube, 7 ... Stopper, 8 ... Spring, 9 ... Switch box,
10 …… Slider, 11 …… Limit switch, 12 …… Detecting lever, L _{SA to} L _SE …… Limit switch

Front page continuation (72) Inventor Hirofumi Inoue 1-1 Irisatoyama-cho, Gyoda-shi, Saitama Iwasaki Electric Co., Ltd. Saitama Manufacturing Co., Ltd. (56) References 18088 (JP, Y2)

Claims (3)

[Scope of utility model registration request] 1. A winding device for winding a wire on a lifting / lowering device main body mounted on a ceiling, and an elevating / lowering device for suspending a lighting fixture or the like which is raised / lowered by the wire on the lower part of the lifting / lowering device main body, and an upper part of the lifting / lowering device. In an elevating device in which a lock bar provided in the center is inserted into a guide tube provided on a mounting base on the main body side and can be held by a stopper, a detection lever is provided on the outer circumference of the guide tube near the lock rod entrance and exit. A lifting device for a lighting fixture or the like, which detects that the tip of the lifting lever comes into contact with the detection lever and stops the lifting operation of the lifting body. 2. An elevating device for a lighting fixture or the like according to claim 1, wherein the operation of the elevating body is reversed by detecting that the tip of the lock rod contacts the detection lever. 3. The operation of the elevating body is reversed by detecting that the tip of the lock rod contacts the detection lever, and after a certain time,
Lifting devices such as lighting fixtures that can be automatically raised again.