JP2008204899A - Elevating apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevating apparatus in which the number of components can be minimized and the number of assembling works can be reduced and occurrence of failures can be controlled as much as possible. <P>SOLUTION: The elevating apparatus is provided with a fixed portion A arranged in a high place and a lifting portion B for fixing a lighting apparatus hung from the fixed portion A with a wire C and the lighting apparatus is lifted by driving of a motor 2, and a plurality of inspection items at the time of lifting of the lifting portion B can be detected by a single limit switch 5 by using detection auxiliary means 7, 8. Concretely, the inspection items includes a lifting limit detection of the lifting portion, an overload detection for a wire and a wire torsion detection, and the detection auxiliary means 7, 8 are composed of a first auxiliary means 7 for assisting the lifting limit detection, a second auxiliary means 8 for assisting the overload detection and a third auxiliary means 7 (9) for assisting the wire torsion detection, and the limit switch 5 is provided with a contactor 5B. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an elevating device that can raise and lower various appliances such as a lighting fixture suspended from a ceiling or the like.

  2. Description of the Related Art Conventionally, a lift device for lifting and lowering a lifted device such as a lighting fixture suspended from a ceiling or the like is known (see Patent Document 1). 7 and 8, the lifting device 100 includes a fixed portion 110 fixed to a ceiling or the like, a drum 102 connected to a reversible rotation type motor 101 provided inside the fixed portion 110, and the drum 102. A wire rope 104 that suspends a lifting / lowering unit 120 and a device to be lifted / lowered such as a lighting fixture attached thereto via a pulley 103, a limit switch 105 that detects a rising limit, and a limit that detects an overload. A switch 106 and a limit switch 107 that detects a shake such as a twist of the wire rope 104 are provided.

  In the lifting device 100, when the lifting unit 120 rises to the upper limit in FIG. 9, the upper surface of the lifting unit 120 pushes the contact 105 </ b> A of the limit switch 105, thereby operating the limit switch 105 and the motor 101. Stops.

  Further, in FIG. 10, when an overload acts on the wire rope 104 that supports the lifting unit 120, the sleeve 106 </ b> A attached to the end of the wire rope 104 is pulled downward. On the other hand, since the metal fitting 106B and the compression spring 106C are provided below the sleeve 106A, when the sleeve 106A is pulled downward, the compression spring 106C is bent and the metal fitting 106B is lowered. Then, since the contact 106D of the limit switch 106 is lowered, it is turned OFF and the motor is stopped. Thereafter, when the overload is eliminated, the metal fitting 106B is pushed up by the spring force of the compression spring 106C, the contact 106D is pressed and the limit switch 106 is turned on, and the motor is restarted.

Further, in FIG. 11, a pressing member 108 that is displaceable in a fixed direction is installed at the distal end portion of the contact 107A attached to the limit switch 107 that detects vibration such as torsion. In addition, a hole 108A (see FIG. 12) is opened on the proximal end side of the pressing member 108, and the wire rope 104 passes therethrough. Therefore, when the elevating unit 120 is twisted and rotated, the wire rope 104 is also twisted and pulled, moves in the direction of the elevating unit 120 (arrow), and the pressing member 108 is also pulled in the same direction. As a result, as shown in FIG. 11, the tip of the pressing member 108 pushes the contact 107A, the limit switch 107 is turned off, and the motor stops.
Japanese Patent Application Laid-Open No. 11-203932

  However, in such a lifting device, as shown in FIG. 13, three limit switches are required, and the number of parts such as limit switch mounting brackets, lead wires, connectors and the like increases accordingly. For this reason, as the number of parts increases, the assembly man-hour of the lifting device increases. In addition, in terms of the reliability of the equipment of the lifting device, the probability of equipment failure increases as there are three limit switches.

  The present invention has been made in view of the above circumstances, and provides an elevating device that can reduce the number of parts to a minimum, reduce the number of assembling steps, and suppress the occurrence of failure as much as possible. With the goal.

  The lifting device of the present invention includes a fixing portion fixed at a high place, and a lifting portion that is suspended from the fixing portion by a wire and fixes the lifted device. The lifting device lifts and lowers the lifted device by driving a motor. The apparatus is configured to detect a plurality of detection items using a single detection unit and a detection auxiliary unit when the elevating unit is raised.

The detection items are ascending limit detection of the elevating part, overload detection for the wire, and twist detection of the wire, and the detection means includes a limit switch and first and second levers,
The detection assisting means includes first auxiliary means for assisting the operation for detecting the upper limit, second auxiliary means for assisting the operation for detecting the overload, and third auxiliary means for assisting the operation for detecting the wire twist. It is good also as a structure provided.

  The first lever is installed on the fixed portion so as to be movable in a substantially horizontal direction, and has a locking means at the tip for locking and pressing a contact provided on the limit switch. In addition, the central portion of the base end portion has a long hole that penetrates the wire and notches on both sides of the base end portion, and the first auxiliary means can displace the first lever in a substantially horizontal direction. And a pair of protrusions provided in the vicinity of the wire outlet on the upper part of the elevating part in a state of entering the notch of the first lever. When the rising limit is detected, the limit switch is operated by pulling the first lever closer to the center of the elevating part by a displacement operation of the notch that is locked to the inclined part of the protrusion. Also good.

  The second lever is installed in the fixed portion so as to be slidable vertically downward while being regulated by the guide means, and a linear portion provided on the lower end side and an inclination provided on the upper portion of the linear portion And the second auxiliary means includes a sleeve that is crimped to the tip of the wire rope and a spring that is disposed between the upper part of the elevating part directly below the second lever under the sleeve. The limit switch may be configured to be pressed by the inclined portion when detecting that an overload is generated in the elevating portion.

  The first lever is provided with a long hole at the base end portion, and the third auxiliary means is also used as the first auxiliary means, and when the twist of the wire is detected, the first lever penetrates the long hole of the first lever. The limit switch may be operated by pressing the contact by pulling the first lever closer to the center of the lift by moving the wire toward the center of the lift. Good.

  According to the present invention, there is provided an elevating device that includes a fixing unit fixed at a high place and an elevating unit that is suspended from the fixing unit by a wire and fixes an elevating device, and that elevates the elevating device by driving a motor. And when it is raised and lowered, it is configured to detect multiple detection items using a single detection means and detection auxiliary means, so the number of parts can be reduced to the minimum, It is possible to provide an elevating device that can reduce the number of assembly steps and can suppress the occurrence of failure as much as possible.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
FIG. 1 shows an elevating apparatus according to an embodiment of the present invention, which is configured to elevate a lighting fixture not shown.
The lifting device 1 generally includes a fixed portion A fixed to the ceiling, a wire rope C attached to the fixed portion A and the ceiling, and a lifting portion B suspended by the wire rope C. Yes.

  As shown in FIG. 2, the fixed portion A includes a motor 2, a descent switch (not shown), a rise switch 3, a power supply 4, and a common limit switch 5. Further, a base 52 is mounted on the substrate 51 of the fixed portion A, and the motor 2 and the common limit switch 5 are attached to the base 52. On the other hand, a lighting fixture is integrally fixed to the elevating part B.

The motor 2 uses a reversible rotating type that rotates in the opposite direction when rising and falling, and is wound around a drum 21 that rotates integrally with the end of the wire rope C fixed.
The descent switch is used when the lighting fixture is lowered as required, and the ascent switch 3 is used when the lowered lighting fixture is raised and returned to the original position. .
As the power source 4, a commercial power source may be used, or a DC power source such as a battery, a battery or the like may be used.

  The common limit switch 5 is to detect a plurality of detection items when the elevating part B is raised, that is, in the present invention, three items of ascending limit detection, overload detection, and wire twist detection with this one limit switch, These detections are performed by a first lever 6A and a second lever 6B, which will be described later, and detection assisting means. Therefore, the lifting device 1 of the present invention is provided with the first lever 6A and the second lever 6B, and the detection auxiliary means constituted by the first auxiliary means 7 to the third auxiliary means 9.

  3A and 4, the common limit switch 5 of the present embodiment is fixed to a wall surface 52A of the fixed portion A where the gantry 52 stands up via a bracket 52B. Further, the common limit switch 5 includes a contact portion 5A and a contact 5B, and the contact portion 5A is pressed by a locking piece 61A of a first lever 6A, which will be described later, via the contact 5B. The limit switch 5 is activated. Similarly, in the common limit switch 5, in FIG. 3B, the contact portion 5A is pressed via the contact 5B even when the lower end portion of the second lever 6B described later is lowered, and the common limit switch 5 is It will also work.

  In FIG. 3A, the first lever 6A stops the operation of the motor 2 together with the first auxiliary means 6 described later when detecting that the elevating part B has reached the ascent limit. In the present embodiment, as shown in FIGS. 1 and 4, on the wall surface 52 </ b> A of the fixed portion A where the gantry 52 stands, the restricting means that protrudes from the wall surface 52 </ b> A to restrict the displacement direction of the first lever 6 </ b> A is configured. A support member 52C for supporting the first lever 6A is provided, and the first lever 6A is installed so as to be displaceable in the −X direction via the support member 52C. Further, as shown in FIGS. 4 and 6, the first lever 6 </ b> A is provided with a locking piece 61 </ b> A that presses the contact 5 </ b> B of the common limit switch 5 at the tip. Further, as shown in FIG. 5, the first lever 6A has a long hole 62A through which the wire rope C penetrates on the base end side, and a notch 63A formed in the base end portion. Yes.

  In FIG. 3A, the second lever 6B stops the operation of the motor 2 together with the second auxiliary means 7 described later when detecting that an overload has occurred in the elevating part B. In FIG. 4, the second lever 6B of the present embodiment stands upright on the guide wall 52D and the substrate 51 where the gantry 52 stands (guides the vertical movement on the upper surface of the second lever) (at the lower portion of the second lever). As shown in FIG. 3, it is installed so as to be slidable only in the vertical downward direction (−Z direction) while being guided by the guide member 51A. Further, as shown in FIG. 3B, the second lever 6B is inclined at the lower end portion on a straight line 61A provided parallel to the vertical direction and on the upper portion of the straight line portion 61B adjacent to the straight line portion 61A. Part 62B.

  The first auxiliary means 7 includes a locking piece 61A of the first lever 6A shown in FIG. 4, the long hole 62A and the notch 63A shown in FIG. 5, and the wire rope C on the upper surface of the elevating part B shown in FIG. Protrusions 71 having a substantially quadrangular pyramid shape provided in a state of entering the notch 63A of the first lever 6A in the vicinity of the outlet. When the elevating part B is raised, the inclined part 71A of the protrusion 71 is engaged with a notch 63A formed at the base end part of the first lever 6A. When the elevating part B further rises to near the upper limit, the inner periphery located at the back of the notch 63A is guided along the slope direction of the inclined part 71A, and the first lever 6A is pulled inward (−X). Can be detected, so the rise limit can be detected.

  The second auxiliary means 8 includes a sleeve 81 crimped to the tip of the wire rope C shown in FIG. 3A, and a fixed portion A below the second lever 6B just below the sleeve 81 shown in FIG. And a straight portion 61B and an inclined portion 62B of the second lever 6B shown in FIG. When a load is applied to the elevating part B, the wire rope C is pulled downward in FIG. 3 (A), and the second lever 6B is lowered according to the magnitude of the load to detect overload. That is, in the second lever 6B, the linear portion 61B on the lowermost end side is normally in contact with the contact portion 5A of the shared limit switch 5, but when the second lever 6B is lowered downward by a predetermined stroke in this way. Since the inclined portion 62B of the second lever 6B shown in FIG. 5B contacts the contact portion 5A of the common limit switch 5 and pushes it to the right, the common limit switch 5 can be operated.

  The third auxiliary means 9 is also used as the first auxiliary means 7. That is, when the lifting part B is twisted as shown in FIG. 6A, due to the action of the wire rope C penetrating the elongated hole 62A provided on the base end side of the first lever 6A shown in FIG. As shown in (B), the wire rope C moves toward the central part of the elevating part B. Therefore, following the movement of the wire rope C in the inner direction, the first lever 6A can be displaced in the same direction to detect the twist of the wire. Thus, since the first lever 6A can be pulled inward (−X), the common limit switch 5 can be operated.

Next, the operation of this embodiment will be described.
(I) Ascent detection:
When the elevating device 1 is raised by operating the elevating switch 3, when the elevating part B rises to near the ascending limit, as shown in FIG. The notch 63A is locked. Therefore, the first lever 6A is pushed toward the center of the elevating part B. That is, the first lever 6A is gradually pulled toward the center of the elevating part B, that is, in the −X direction.
Thereafter, when the elevating part B rises to the ascending limit, as shown in FIG. 4, the first lever 6A is pulled in the predetermined stroke inside (-X) direction. Detecting, the locking piece 61A on the tip side presses the contact 5B of the common limit switch 5. As a result, the common limit switch 5 operates, and the ascending operation of the elevating part B that exceeds the ascending limit when the motor 2 is stopped is avoided.

(II) Overload detection:
In FIG. 3A, the second lever 6 </ b> B usually has the linear portion 61 </ b> B on the lowermost end side in contact with the contact portion 5 </ b> A of the common limit switch 5. However, when a load is applied during the raising / lowering of the elevating part B, the wire rope C is also pulled downward, and the second lever 6B is lowered according to the magnitude of the load. When the second lever 6B descends in this way, in FIG. 5B, the inclined portion 62B of the second lever 6B starts to contact the contact portion 5A of the common limit switch 5 and presses this to detect overload. To do. Thereby, the common limit switch 5 operates and the motor 2 is stopped to protect the motor.

(III) Wire twist detection:
When the lifting part B is twisted and rotated while being lifted, the wire rope C is also moved toward the central part of the lifting part B as shown in FIG. 6B, and the wire rope C is displaced inward. Following the operation, the first lever 6A is displaced in the same direction. For this reason, since the first lever 6A can be pulled inward (−X), the twist of the wire rope C is detected. As a result, as shown in FIG. 5A, the common limit switch 5 is operated, and the motor 2 is stopped to prevent a trouble with the motor 2 due to twisting.

  The present invention is not limited to the embodiment described above, and can be implemented in various forms without departing from the gist of the present invention.

  The lifting device of the present invention includes a fixing portion fixed at a high place, and a lifting portion that is suspended from the fixing portion with a wire and fixes the lifted device. The lifting device lifts and lowers the lifted device by driving a motor. And when it is configured to detect a plurality of detection items using a single detection means and detection auxiliary means when the elevator is raised, the number of parts can be reduced to the minimum It is possible to reduce the number of man-hours and has an effect of suppressing the occurrence of failure as much as possible, which is useful for a lighting device lifting device and the like.

It is a perspective view which shows the whole structure of the raising / lowering apparatus which concerns on embodiment of this invention. It is a wiring diagram of the lifting device. (A) is a longitudinal sectional view showing the configuration of the lifting device, and (B) is an enlarged view of the α portion. It is a top view of the raising / lowering apparatus. It is explanatory drawing which shows the operation | movement principle of the raise limit detection in the raising / lowering apparatus. (A) is explanatory drawing which shows the switch operation | movement by the overload detection and the twist detection of the raising / lowering apparatus, (B) is explanatory drawing which shows the operation principle of the twist detection in the raising / lowering apparatus. It is explanatory drawing which shows the whole structure of the conventional raising / lowering apparatus. It is a perspective view of the lifting device. It is sectional drawing which shows the operation | movement principle of the raise limit detection by the raising / lowering apparatus. It is sectional drawing which shows the operation | movement of the overload detection by the raising / lowering apparatus. Explanatory drawing which shows the switch operation | movement by the overload detection and twist detection of the raising / lowering apparatus, (B) is explanatory drawing which shows the operation principle of the twist detection in the raising / lowering apparatus. It is explanatory drawing which shows the lever operation | movement by the overload detection and the twist detection of the raising / lowering apparatus. It is a wiring diagram of the lifting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lifting device 2 Motor 3 Lift switch 4 Power supply 5 Limit switch (detection means)
5A Contact part 5B Contact 51 Substrate 51A Guide member (guide means)
52 frame 52C bearing member (regulation means)
52D guide wall (guide means)
6A 1st lever 6B 2nd lever 61A Locking piece (locking means)
61B Straight part 62A Long hole 62B Inclined part 63A Notch 7-9 1st auxiliary | assistant means-3rd auxiliary | assistant means (detection auxiliary | assistant means)
71 Projection 71A Inclined part 81 Sleeve 82 Spring A Fixed part B Lifting part C Wire rope

Claims (5)

A lifting device fixed at a high place, and a lifting device that is suspended from the fixing portion with a wire and fixes a lifted device, and is a lifting device that lifts and lowers the lifted device by driving a motor,
A lifting device that detects a plurality of detection items by using a single detection means and a detection auxiliary means when the lifting portion is lifted. The detection items are ascending limit detection of the elevating part, overload detection for the wire, and wire twist detection,
The detection means includes a limit switch and first and second levers,
The detection assisting means includes first auxiliary means for assisting the operation for detecting the upper limit, second auxiliary means for assisting the operation for detecting the overload, and third auxiliary means for assisting the operation for detecting the wire twist. The lifting device according to claim 1 provided. The first lever is installed on the fixed portion so as to be movable in a substantially horizontal direction, and has a locking means at the tip for locking and pressing a contact provided on the limit switch. And a long hole that penetrates the wire in the center of the base end and a notch on both sides of the base end,
The first auxiliary means includes a restricting means installed on the fixing portion for restricting the first lever so that the first lever can be displaced in a substantially horizontal direction, and the upper portion of the elevating portion in a state of entering the notch of the first lever. A pair of protrusions provided in the vicinity of the wire outlet,
When the elevating part detects the ascent limit, the limit switch is operated by pulling the first lever closer to the center of the elevating part by a displacement operation of the notch that is engaged with the inclined part of the protrusion. The raising / lowering apparatus of Claim 2 comprised in this. The second lever is installed in the fixed portion so as to be slidable vertically downward while being regulated by the guide means, and a linear portion provided on the lower end side and an inclination provided on the upper portion of the linear portion With
The second auxiliary means comprises a sleeve crimped at the tip of the wire rope and a spring disposed between the upper part of the elevating part directly below the second lever under the sleeve,
The elevating device according to claim 2, wherein when the overload is detected in the elevating unit, the limit switch is pressed by the inclined unit. The first lever is provided with a long hole at the base end,
The third auxiliary means is also used as the first auxiliary means,
When the twist of the wire is detected, the wire penetrating through the elongated hole of the first lever pulls the first lever closer to the center of the elevator by a displacement operation toward the center of the elevator. The lifting device according to claim 2, wherein the limit switch is operated by pressing the contact.

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