JP2008201563A - Lifting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lifting device capable of reducing the number of parts to the minimum, reducing the assembling man-hour and suppressing generation of failure as much as possible. <P>SOLUTION: The lifting device 1 is provided with a fixed part A fixed to a high position and a lifting part B for fixing equipment to be lifted hung down from the fixed part A by a wire rope C, and lifts the equipment to be lifted by driving of a motor 2. At descending of the lifting part B, a plurality of detection items are detected using a detection auxiliary means and a single detection means. Specifically, the detection item is sagging detection of the wire rope C, end detection of the wire rope C and descending limit detection of the lifting part B. The detection means is provided with a limit switch 5 and a lever 6, and is provided with a first auxiliary means 6 for assisting the sagging detection; a second auxiliary means 8 for assisting the end detection of the wire rope C; and a third auxiliary means 9 for assisting the descending limit detection of the lifting part B. <P>COPYRIGHT: (C)2008,JPO&amp;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. The wire rope 104 that suspends the lift 120 and a lifted device 130 such as a lighting fixture attached thereto via the pulley 103 and the like, the limit switch 105 that detects slack, and the end of the wire rope 104 are detected. And a limit switch 107 for detecting a lowering limit.

  As shown in FIG. 9, in the lifting device 100, the lower end of a lever 105A provided in the vicinity of the limit switch 105 of the fixed portion 110 is pulled by a spring 105B. That is, normally, when the wire 104 is normally pulled, the lever 105A, which is also the rotating shaft of the pulley 105C, is pulled to the left against the elastic force of the spring 105B (solid line portion), and the upper end of the lever 105A Is turning on the limit switch 105. On the other hand, when the wire 104 is slack, the upper end of the lever 105A is displaced to the right with the point A as a fulcrum (broken line portion), so that the limit switch 105 is turned off without being pressed, and slack can be detected.

  In addition, when the elevating unit 120 is lowered, the drum 102 opens the wire 104 in FIG. 10, but the drum 102 continues to rotate to the end of the wire 104 even if the lowering limit position is exceeded for some reason. If so, the wire end is detected. That is, if the drum 102 continues to rotate even after reaching the end of the wire 104, the wire 104 is wound up, so that the wire 104 moves downward. As a result, when the wire 104 is locked to the tip of the lever 106A attached to the limit switch 106, the lever 106A is pressed and the limit switch 106 is operated to stop the motor 101.

In addition, in FIG. 11, when the drum 102 rotates due to the lowering of the elevating unit 120, the first gear 107A directly coupled to the drum 102 rotates, and the rotational force is transmitted to the second gear 107B to the fifth gear 10E. Is done. Then, the dog 107G provided on the sixth gear 107F at the final stage depresses the limit switch 107 to detect the lower limit, and stops the motor 101. The position of the dog 107G is adjusted in advance when the elevating part 120 is at the ascent limit.
JP-A-5-797

  However, in such a lifting device, as shown in FIG. 12, three limit switches are necessary to perform the detection operation of the three items, and the limit switch mounting bracket, lead wire, The number of parts such as connectors also increases. 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 that the equipment will fail is increased by the three limit switches.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an elevating apparatus that can reduce the number of parts to a minimum and reduce the number of assembly steps, and can suppress the occurrence of a failure as much as possible.

  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 by using a detection auxiliary unit and a single detection unit when the elevating unit is lowered.

  The detection items include wire sag detection, wire end detection and descent limit detection, and the detection means includes a limit switch and a lever, and the detection assisting means performs the sag detection operation. The first auxiliary means for assisting, the second auxiliary means for assisting the operation of detecting the end of the wire, and the third auxiliary means for assisting the operation of detecting the lower limit of the elevating part may be provided.

  The first auxiliary means includes a pulley shaft that can displace one end upward when the wire of the pulley on which the wire is laid down, and a compression spring that presses the one end of the pulley shaft upward from below And a roller disposed with the one end of the lever sandwiched above the one end of the pulley shaft, and the end of the pulley shaft is displaced upward when the wire installed on the pulley is slack. Thus, the sagging may be detected and the limit switch may be operated.

  The second auxiliary means includes a first pushing piece provided at the other end of the lever, and when the wire is released to the end, the wire pushes down the first pushing piece provided on the lever. The wire end detection may be performed and the limit switch may be operated.

  The third auxiliary means includes a drum directly connected to the motor, a gear train directly connected to the drum, a gear train having a speed reducing function, a dog provided on a final gear of the gear train, and one end of the lever that is locked to the dog. A second pushing piece provided on the part, and when the lifting part descends to the lowering limit, the dog detects the lowering limit by pressing the second pushing piece provided on the lever, and the limit switch It may be configured to operate.

  According to the present invention, the lifting device 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, and lifts and lowers the lifted device by driving a motor. Then, when the elevating part is lowered, it is configured to detect a plurality of detection items by using a detection auxiliary means and a single detection means, and 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 device according to an embodiment of the present invention, which is configured to elevate an unillustrated lighting fixture that is a raised / lowered device.
The lifting device 1 generally includes a fixed part A fixed to the ceiling, a wire rope C having both ends attached between a drum 21 (described later) of the fixed part A and the ceiling, and a wire rope to the fixed part A. Elevating part B suspended by C.

  As shown in FIG. 2, the fixed portion A includes a motor 2, a lowering switch 3, an ascending switch (not shown), a power source 4, and a common limit switch 5. In addition, in this fixed portion A, a gantry 52 is mounted on the substrate 51, and the motor 2 and the common limit switch 5 are attached to the gantry 52. Note that a lighting fixture (not shown) 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 descending, and the terminal CE of the wire rope C is fixedly wound around the drum 21 that rotates integrally.
The descent switch 3 is used for lowering the lighting fixture (along with the elevating part B) as necessary. On the other hand, the raising switch is used when raising the lowered lighting fixture to return it 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 configured to detect a plurality of detection items when the elevating part B is lowered, that is, according to the present invention, three items of slack detection, wire end detection, and descent limit detection with this one limit switch 5. These detections are performed in cooperation with a lever 6 and detection assisting means described later. For this reason, the lifting device 1 of the present embodiment is also provided with detection assisting means constituted by the lever 6 and the first auxiliary means 7 to the third auxiliary means 9.

  3 and 4, the common limit switch 5 of the present embodiment is fixed to the upper surface 52A of the gantry 52 of the fixed portion A via a bracket 55. Further, the common limit switch 5 is provided with a contact portion 5A and a presser 5B. When the contact portion 5A is pressed at the base end portion of the lever 6 via the contactor 5B, the switch operates to operate the motor. 2 stops.

  The lever 6 has a substantially T-shape provided with first and second pushing pieces 6A and 6B protruding from the tip portion on both sides (see FIG. 1), and an intermediate portion is provided on the side wall surface 52B of the gantry 52. A rotation shaft 61 serving as the attached rotation fulcrum α is provided (see FIG. 3), and the rotation shaft 61 is rotatable about the rotation fulcrum α. Further, the base end portion of the lever 6 constitutes a part of the first auxiliary means 7 (which also constitutes a part of the second auxiliary means 8 to the third auxiliary means 9), and the base 52 It is sandwiched between a pulley shaft 53A, which is the rotation center of the pulley 53 provided on the side wall surface 52B side, and the base end portion is pushed up by a cooperative action with any of the first auxiliary means 7 to the third auxiliary means 9 Then, the contact portion 5A is pressed through the contact 5B, and the common limit switch 5 is activated.

  The pulley shaft 53A, which is the rotation center of the pulley 53, has a narrow shape provided in the longitudinal (Z) direction on the side wall surface 52B side of the gantry 52, and has a longitudinal groove 52C that is deep in the Y direction (see FIG. 3 and FIG. 4). As a result, as shown in FIG. 4, the pulley shaft 53A has a proximal end portion that is centered on the rotation fulcrum (β) and a distal end portion that can be displaced upward in the vertical groove 52C.

  The first auxiliary means 7 detects slack in the wire rope C. As shown in FIG. 4, the first auxiliary means 7 is a compression spring housed in a spring chamber 52D having the same width inside the deep groove 52C but one step deeper than that. 71, the distal end portion of the pulley shaft 53A that contacts the compression spring 71 from above, the proximal end portion of the lever 6 that contacts the distal end portion of the pulley shaft 53A from above, and the proximal end portion of the lever 6 from above A roller 72 that contacts and rolls as the lever 6 is displaced in the vertical (Z) direction within the deep groove 52C, and a contact 5B that comes into contact with the roller 72 from above are provided. Are arranged in a vertical line.

  That is, normally, in a normal wire state without sagging, a predetermined tension state or load acts on the drum 21 or each pulley via the wire rope C. If sagging occurs in the wire rope C for some reason, The downward pulling force by the wire rope C is reduced. For this reason, in the first auxiliary means 7, the balance between the upward spring force by the compression spring 71 and the downward tensile force by the wire rope C is lost, and the base end portion of the lever 6 (see FIG. In FIG. 3, the right end portion) is displaced upward. As a result, in FIG. 4, the pulley shaft 53 </ b> A rotates clockwise around the base end (fulcrum β), and the front end is displaced upward to share the roller 72, the base end of the lever 6, and the common end. The contact portion 5A is pressed upward via the contact 5B of the limit switch 5, and the common limit switch 5 is activated.

  The second auxiliary means 8 detects that the wire rope C has been opened to the end, that is, the end (wire end) CE of the wire rope C, and is provided protruding from the tip of the lever 6. The first pushing piece 6A is used.

  That is, in FIG. 3, the drum 21 rotates clockwise while opening the wire rope C. However, if the elevating part B continues to move down for some reason beyond the lower limit, the second auxiliary means 8 moves together with the lever 6 and the like. The wire end CE is detected. That is, even after the wire rope C is completely released to the wire end CE, if the drum 21 continues to rotate in the same direction, that is, the terminal CE of the wire rope C fixed to the winding drum portion 21A is fixed. If the part to be rotated continues in the same direction after reaching the shortest position (positions around 2 o'clock in FIG. 3) with respect to the facing pulley 22, the following operation is performed. The wire end CE is detected, and the rotating operation of the drum 21 and the motor 2 is stopped.

  That is, the drum 21 continues to the operation mode in which the winding operation of the wire rope C is started after the release operation of the wire rope C is completed. That is, the drum 21 tries to continue the same rotation operation in the same rotation direction as that in the release operation. However, since the end CE portion of the wire rope C is fixed to the winding drum portion 21A, the wire rope C is forcibly wound around the drum 21 that continues to rotate. As a result, the winding position of the wire rope C moves downward, but the traveling route of the wire rope C also moves downward accordingly. During the displacement of the travel position of the wire rope C, the wire rope C contacts the lever 6. Therefore, the tip of the lever 6 is pushed down and the wire end CE is detected.

In this manner, when the distal end of the lever 6 is pushed down to the position where the terminal CE rotates and moves to the position before and after 4 o'clock as shown in FIG. 3, the base end of the lever 6 passes through the roller 72. Since the contact 5B of the common limit switch 5 is pushed up, the common limit switch 5 is activated and the motor 2 stops rotating. As a result, the drum 21 also stops rotating.
As shown in FIG. 3, when the drum 21 continues to rotate in the same direction even after the wire rope C is released to the end CE, the wire rope C is rubbed or cut at the corner of the upper surface 52A of the gantry 52. In order to avoid this, a protective member 52E having a cross-section Δ shape is installed on the upper surface 52A of the gantry 52 to ensure smooth running.

  The 3rd auxiliary | assistant means 9 detects this when the lighting fixture is lowered | hung to a predetermined position (descent | fall limit) with the raising / lowering part B by opening the wire rope C, and in this embodiment, FIG. In FIG. 6, a gear train 91 having a speed reduction mechanism, a dog 92, and a second pushing piece 6 </ b> B provided to protrude from the tip of the lever 6 are configured. The gear train 91 includes a first gear 91A to a sixth gear 91F, and a dog 92 is installed on the sixth gear 91F that is the final gear.

  The first gear 91 </ b> A is integrally fixed coaxially with the rotation shaft of the drum 21, and rotates integrally with the drum 21 in the same direction at the same angular velocity. The second gear 91B rotates in the opposite direction to the first gear 91A while meshing with the first gear 91A, but has more teeth than the first gear 91A and the angular velocity is reduced. The second gear 91 </ b> B is rotatably installed on the flange 21 </ b> B of the drum 21, and performs a revolving operation as well as a rotating operation by the rotation of the drum 21. The third gear 91C is integrally fixed to the rotation shaft of the second gear 91B, and rotates and revolves at the same angular velocity as the second gear 91B. The third gear 91C meshes with an internal gear constituting the fourth gear 91D. Accordingly, since the third gear 91C is integrally attached to the second gear 91B as described above, the planetary gear also performs a revolving operation by the rotation of the drum 21 (along the internal gear of the fourth gear 91D). Configure the gears. On the other hand, in the fourth gear 91D, a fifth gear 91E is integrally fixed to a rotating shaft, and these two gears rotate in the same direction at the same angular velocity. The fifth gear 91E is rotatably attached to a bearing member 93 that stands on the substrate 51, and meshes with the sixth gear 91F. The sixth gear 91F is rotatably attached to the bearing members 94 and 95 that stand on the substrate 51, and rotates in the opposite direction to the fifth gear 91E, but rotates because it has more teeth than the fifth gear 91E. Angular velocity is reduced. That is, when the drum 21 and the first gear 91A that rotates together with the drum 21 start to rotate, the dog 92 rotates at a predetermined rotation speed (n) and the elevating part B reaches the lower limit. The sixth gear 91F is configured to rotate only slightly less than one rotation until the first gear 91A rotates by a predetermined number of rotations (n).

  The dog 92 rotates at the same angular velocity as that of the sixth gear 91F via the gear train 91. However, as described above, the sixth gear 91F is greatly decelerated compared to the rotational angular velocity of the drum 21, and the lighting fixture is When the elevating part B is lowered to a predetermined position (downward limit), the dog 92 just depresses the second pushing piece 6B of the lever 6 to stop the operation of the motor 2.

Next, the operation of this embodiment will be described.
(I) Slack detection:
If slack occurs in the wire rope C during the operation of lowering the lifting part B of the lifting device 1 by operating the lowering switch 3, as shown in FIG. 4, the downward movement by the wire rope C at the pulley shaft 53A is performed. The tensile force is weakened. Therefore, the balance between the upward spring force by the compression spring 71 of the first auxiliary means 7 and the downward tension force by the wire rope C is lost, and the pulley shaft 53A is caused to move to the base end portion (fulcrum β) by the spring force of the compression spring 71. ) In the clockwise direction, and the tip portion is displaced upward (indicated by the alternate long and short dash line in the figure). That is, the tip of the pulley shaft 53A is raised. For this reason, the base end portion (the right end portion in FIG. 3) of the lever 6 is also displaced upward to detect sag. As a result, in FIG. 4, since the contact 5B of the shared limit switch 5 is pressed upward via the roller 72 and presses the contact portion 5A, the shared limit switch 5 operates. For this reason, the common limit switch 5 is operated, the motor 2 is stopped, and the lowering operation of the elevating part B is stopped.

(II) Wire end detection:
Also, during the operation of operating the lowering switch 3 to lower the elevating part B of the elevating device 1, the lowering limit detection operation is not performed for some reason, and the elevating unit B is not stopped without stopping the elevating device 1. Assume that the descent operation continues beyond the position of the descent limit. As a result, it is assumed that all of the wire rope C is released from the drum 21 to the end CE. Then, in FIG. 3, the drum 21 tries to continue rotating in the same direction even after all the wire ropes C are opened. As a result, the drum 21 starts a winding operation for the wire rope C that has been opened. Therefore, the wire rope C is forcibly moved downward so as to be wound around the drum 21, and at this time, the tip of the lever 6 that contacts the wire rope C is also pushed downward to detect the wire end. Then, when the end CE of the wire rope C is rotated and moved to a position before and after 4 o'clock as shown in FIG. 3, the common limit switch 5 is actuated to stop the rotation of the motor 2.

(III) Lower limit detection:
Further, when the lowering switch 3 is operated to lower the elevating part B of the elevating device 1, the sixth gear 91F of the third auxiliary means 9 is geared compared to the drum 21 and the first gear 91A rotating integrally therewith. Since it rotates slowly in a state of being decelerated through the row 91, the dog 92 integrated therewith also slowly rotates little by little at the same angular velocity. That is, the drum 21 and the first gear 91A integrated therewith rotate a number of times during the period from when the elevating part B starts to descend until it descends to the lower limit, but the sixth gear 91F and the dog 92 rotate once. We turn slightly. Thereafter, when the lighting fixture reaches a predetermined position (downward limit) together with the lifting part B, the dog 92 contacts and presses the second push piece 6B at the tip of the lever 6 to detect the downward limit.

  That is, when the limit switch 5, the lever 6, and the third auxiliary means 9 detect the lowering limit of the elevating part B, the base end part of the lever 6 pushes up against the downward pulling force of the wire rope C. Thereby, the contact portion 5A is pressed upward via the contact 5B of the common limit switch 5, and the common limit switch 5 is activated, so that the motor 2 is also stopped.

  Therefore, according to this embodiment, the limit switch 5, the lever 6, and the first auxiliary means 7 can detect the slack of the wire rope C and immediately stop the operation of the motor 2. Therefore, it is possible to search the fixing portion A, the lifting portion B, etc. of the lifting device 1 to find the cause of the slack generated in the wire rope C and remove it. As a result, the danger that the wire rope C is detached from the reel can be avoided.

  Further, according to the present embodiment, even if the lifting device 1 does not stop for some reason during the operation of lowering the lifting unit B, even if the lifting unit B exceeds the lower limit position, the same limit switch 5. By the lever 6 and the second auxiliary means 8, the wire end can be detected when the drum 21 opens the wire rope C to the end CE. Therefore, when this is detected, the common limit switch 5 is immediately turned ON, the operation of the motor 2 is stopped, and the lowering operation of the elevating part B can be stopped. Thereby, it can prevent that the wire rope C is wound up after that and a raise operation | movement is started after that.

  Further, according to the present embodiment, the lower limit of the elevating part B can be detected by the same limit switch 5, lever 6, and third auxiliary means 9, so when the elevating part B reaches the lower limit and detects this, The common limit switch 5 is turned on, the operation of the motor 2 is stopped, and the lowering operation of the elevating part B can be stopped. Accordingly, during the operation of lowering the lifting unit B, the lifting device 1 does not stop for some reason, and the lifting unit B continues to move down beyond the lower limit position, so that the lighting fixture can be moved to the floor surface. Can avoid the danger of colliding.

  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 since it was configured to detect a plurality of items to be inspected at the time of lowering of the lifting unit with a single detection means using the detection auxiliary means, the number of parts can be reduced to the minimum, This has the effect of reducing the number of assembling steps and suppressing the occurrence of failure as much as possible, and is useful for lifting devices for lighting fixtures.

It is a perspective view which shows the raising / lowering apparatus which concerns on embodiment of this invention. It is a wiring diagram which shows the structure of the electrical part of the raising / lowering apparatus. It is a side view of the raising / lowering apparatus. It is the IV-IV sectional view taken on the line in FIG. It is a top view which shows the structure of the raising / lowering apparatus. It is explanatory drawing which shows the operation principle of the descent | fall limit detection of the raising / lowering apparatus. It is the schematic which shows the whole structure of the conventional raising / lowering apparatus. It is a perspective view which shows the whole raising / lowering apparatus. It is explanatory drawing which shows the operation | movement principle of the slack detection of the raising / lowering apparatus. It is explanatory drawing which shows the operation principle of the wire end detection of the raising / lowering apparatus. It is explanatory drawing which shows the operation principle of the descent | fall limit detection of the raising / lowering apparatus. It is a wiring diagram which shows the electrical structure of the raising / lowering apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Lifting device 2 Motor 3 Lowering switch 4 Power supply 5 Shared limit switch 5A Contact part 5B Contactor 51 Substrate 52 Mount 52C Vertical groove 52D Spring chamber 53 Pulley 53A Pulley shaft 6 Lever 6A First push piece 6B Second push piece 61 Rotating shafts 7-9 First auxiliary means-3rd auxiliary means 71 Compression spring 72 Roller 91 Gear train 91A-91F First gear-6th gear 92 Dog A Fixed part B Lifting part C Wire rope CE Termination (wire end)
α Rotation fulcrum β Rotation fulcrum

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,
An elevating device that detects a plurality of detection items using a detection assisting means and a single detection means when the elevating part is lowered. The detection items are wire slack detection, wire end detection, and descent limit detection of the lifting unit,
The detection means includes a limit switch and a lever,
The detection auxiliary means includes first auxiliary means for assisting the sagging detection operation, second auxiliary means for assisting the end detection operation of the wire, and third auxiliary means for assisting the lower limit detection operation of the elevating unit. The lifting device according to claim 1, comprising: The first auxiliary means includes a pulley shaft that can displace one end upward when the wire of the pulley on which the wire is laid down, and a compression spring that presses the one end of the pulley shaft upward from below And a roller disposed across the one end of the lever above the one end of the pulley shaft,
The elevating device according to claim 2, wherein when the wire installed on the pulley is slack, an end of the pulley shaft is displaced upward to detect the slack and operate the limit switch. The second auxiliary means includes a first pushing piece provided at the other end of the lever,
3. The device according to claim 2, wherein when the wire is opened to a terminal end, the wire end is detected by pressing the first pushing piece provided on the lever, and the limit switch is operated. lift device. The third auxiliary means includes a drum directly connected to the motor, a gear train directly connected to the drum, a gear train having a speed reducing function, a dog provided on a final gear of the gear train, and one end of the lever that is locked to the dog. A second pushing piece provided in the section,
3. The lifting / lowering according to claim 2, wherein when the lifting / lowering part descends to a lowering limit, the dog detects a lowering limit by pressing a second pushing piece provided on the lever and operates the limit switch. apparatus.

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