JP5163829B1 - Foldable storage stage - Google Patents

Abstract

An object of the present invention is to prevent the occurrence of wire winding on a winch drum.
A stage main body 1 that can be bent vertically by a bending portion having a hinge shaft extending in the left-right direction, a winch 2 provided at one end of the stage main body in the front-rear direction, and rotation of the drum of the winch. When the tension of the wire is reduced below a predetermined level in a folding and storing stage including a wire 3 that is wound and unwound and whose front end is coupled to or engaged with the other longitudinal end of the stage body. A wire tension drop detecting unit 6 that outputs a wire tension drop signal to the wire tension, and a wire slack regulating unit 7 that regulates loosening of the wire when the wire tension drop detecting unit outputs the wire tension drop signal. It is characterized by this.
[Selection] Figure 3

Description

  The present invention relates to a folding and storing stage that can be folded vertically and stored in a wall or the like when not in use.

  As a conventional folding storage type stage, for example, the one described in Patent Document 1 is known, and this folding storage type stage has a folding part having a hinge shaft extending in the left-right direction at a central part in the front-rear direction. And a winch provided at the lower part of the rear end of the stage main body, and a wire that is wound and fed out by rotation of the drum of the winch and whose tip is coupled to the lower part of the front end of the stage main body And a pulley provided at the lower part of the center part of the stage body so that the wire can be hung down and the center part of the stage body can be lifted by the tension of the wire, and this is also provided at the lower part of the center part of the stage body. And a spring mechanism that applies an assisting force to the bent portion when the stage body is opened back and forth from the folded state.

  When the stage main body is stored in such a conventional folding storage type stage, the winch rotates the drum from the horizontal development state of the stage main body and winds the wire. When the stage body starts to bend in the vertical direction, and the winch winds up the wire, the stage body is folded vertically and the concave portion of the wall surface is raised. Stored inside.

  On the other hand, when the stage body is deployed horizontally, the winch rotates the drum in the opposite direction to winding the wire, and the wire is fed out. First, the bent part is given an auxiliary force from the spring mechanism at the center of the stage body. Thus, the stage main body starts to open in the front-rear direction from the vertically folded state, and thereafter, the stage body central portion descends due to its own weight and the stage main body front end advances to expand the stage main body to a horizontal state.

JP 10-008750 A

  By the way, in this type of conventional folding storage type stage, when the winch rotates the drum and feeds the wire during horizontal deployment of the stage body, the movement of the stage body slows or stops during deployment and the wire loosens In that case, the drum is reversed and the wire is once wound up, and then it is fed out again. However, at the time of winding, the already loosened wire becomes a turbulent winding state on the winch drum. Sometimes. Also, when the winch further rotates the drum after the horizontal deployment of the stage body and the wire is further fed out, the wire may be loosened. In this case, the winding is already loosened when the stage body is folded. The wire that is running out can be scrambled on the winch drum. Furthermore, when the stage body is folded, if a foreign object is bitten under the wire on one drum of the winch, the wire is wound up excessively, the wire on the other drum is loosened, and the wire is It may become a turbulent state above.

  Further, when the wire is further wound in such a turbulent winding state, the wire is tightened with the wires crossing each other on the drum due to the tension applied to the wire, which is undesirable in terms of the life of the wire and the smooth operation of the stage body. was there.

An object of the present invention is to advantageously solve the above-described problem, and a foldable storage stage according to the present invention includes a stage main body that can be bent vertically by a bending portion having a hinge shaft extending in the left-right direction. A winch provided at one end of the stage body in the front-rear direction, and a wire that is wound and delivered by rotation of the drum of the winch and is coupled or engaged with the other end of the stage body in the front-rear direction. A folding retractable stage comprising: a wire tension drop detecting unit that outputs a wire tension drop signal while applying tension to the wire when the wire tension falls below a predetermined value; and A wire slack regulating portion that regulates the slack of the wire when a tension lowering signal is output. It is.

  In such a folding storage type stage, when the stage main body is stored, the winch rotates the drum from the horizontal development state of the stage main body and winds the wire, whereby the stage main body is stored while being folded vertically. .

  On the other hand, when the stage body is deployed horizontally, the winch rotates the drum in the opposite direction from when the stage body is folded and retracted, and the wire is fed out, so that the middle part of the stage body descends due to its own weight and the front end of the stage body The part moves forward and the stage body expands to a horizontal state.

When the tension of the wire drops below a predetermined level during horizontal deployment of the stage body or afterwards or when it is folded, the wire tension drop detection unit detects the state and outputs a wire tension drop signal while applying tension to the wire. Corresponding to the wire tension lowering signal, the wire slack restricting part restricts the slack of the wire.

  Therefore, according to the folding storage type stage of the present invention, the stage body can be deformed between the folded storage state on the wall or the like and the horizontally deployed state, and at the time of horizontally deploying the stage body, or after that, or By restricting the occurrence of loosening of the wire during folding, it is possible to avoid inconveniences in the life of the wire and the smooth operation of the stage main body due to the irregular winding state of the wire.

In the folding and storing type stage of the present invention, the wire tension drop detecting section moves the moving member while applying tension to the wire so that the moving amount increases as the tension of the wire increases, and the movement A movement amount decrease detecting unit that detects a case where the movement amount of the member is less than or equal to a predetermined amount, and in this way, the movement amount of the movement member when the tension of the wire falls below the predetermined value. Decreases to a predetermined value or less, and the movement amount decrease detection unit detects the decrease in the movement amount. Therefore, the wire tension decrease detection unit can reliably detect that the wire tension has decreased to a predetermined value or less.

Here, the moving member that moves so that the amount of movement increases as the tension of the wire increases is supported so as to be swingable around an axis extending in parallel with the rotation axis of the winch drum, and the wire is hung. The wire is tensioned by its own weight or elastic force so that the greater the wire tension , the greater the amount of rocking , as it is elastically biased by its own weight or in the direction opposite to the direction of rocking due to the wire tension. It may be a swinging member that swings while giving force, and is supported so as to be movable in the tension direction of the wire and is elastic by its own weight in the direction opposite to the moving direction due to the tension of the wire or by a spring member or the like. It is biased, as the swing amount as the tension of the wire is large increases, winch whole or winch Dora moving while giving tension due to its own weight or elastic force to the wire It may be.

  The movement amount decrease detection unit that detects when the movement amount of the moving member is equal to or less than a predetermined value is an electric switch such as a limit switch that operates when the moving element moves below the predetermined amount. In addition, when the moving amount of the moving member becomes a predetermined amount or less, the light from the light emitting unit to the light receiving unit is blocked by the moving member, or the blocked state is eliminated, and the moving amount of the moving member is predetermined by the light receiving unit. It may be an optical sensor that detects that:

  Further, in the folding and storing stage of the present invention, the wire loosening restricting portion is configured to stop the rotation of the winch drum when the wire tension detecting portion detects that the wire tension has decreased to a predetermined value or less. A stopper may be provided, and in this way, the rotation of the drum is stopped and the wire is not manipulated, so that loosening of the wire can be reliably controlled.

  Here, the drum rotation stop unit that stops the rotation of the winch drum may electrically stop the operation of the motor that rotationally drives the winch drum through a reduction gear with a high reduction ratio that is difficult to reversely drive, Alternatively, the operation of the motor may be electrically stopped and the winch drum or the motor may be braked by electrical or mechanical braking or internal friction.

  Further, in the folding and storing stage of the present invention, the wire loosening restricting portion has an unfolded state detecting unit that detects that the stage body is in the unfolded state, and the stage body is in the unfolded state. A signal indicating an abnormal situation may be output when the unfolded state detection unit is not detecting and the wire tension drop detection unit outputs the wire tension drop signal.

  In this way, in the event of an abnormal situation where the tension of the wire has dropped before the stage main body is in the unfolded state, the wire loosening restrictor will notify this by means of a lamp light signal, a buzzer sound signal, etc. The operator of the folding and retracting stage can easily know the occurrence of the abnormal situation, and can safely cope with the abnormal situation.

(A), (b) is the top view of the unfolded state which shows one Example of the folding storing type | formula stage of this invention, and the front view of the unfolded state. (A), (b) and (c) are the side view of the unfolding state which shows the folding storage type stage of the said Example, the side view in the middle of folding or unfolding, and the side view of a folding state. (A) and (e) are a plan view and a side view showing the folding and retractable stage of the above embodiment in a transparent state, and (b), (c) and (d) are It is sectional drawing which follows AA line, BB line, and CC line | wire. (A) And (b) is the top view and expanded side view which fold the folding storage type stage of the said Example, and show in a see-through | perspective state. (A) And (b) is the top view and front view which expand and show the principal part of the winch of the folding storage type stage of the said Example. (A) And (b) is sectional drawing which follows the DD line | wire and EE line in FIG.5 (b), And (c) is the side surface seen from the arrow F direction in FIG.5 (b). FIG. (A), (b) and (c) are the top view, front view, and side view which show the swing arm and rocking | fluctuation rod of the folding storage type stage of the said Example.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIGS. 1A and 1B are a plan view and a front view showing one embodiment of the folding and storing stage of the present invention in an unfolded state, and FIGS. 2A, 2B and 2C. ) Is a side view in an unfolded state, a side view in the middle of folding or unfolding, and a side view in the folded state, showing the folding and storing stage of the above embodiment, where reference numeral 1 denotes a stage body, 2 denotes a winch, and 3 denotes a wire , FL represents a floor surface, W represents a wall surface, and P represents a recess.

  As shown in FIG. 1, the folding storage type stage of this embodiment includes a stage main body 1 that can be bent vertically by a bending portion 1a at the center in the front-rear direction of the stage having a hinge shaft extending in the left-right direction, and the stage main body. The winch 2 provided at the rear end portion (upper end portion in FIG. 1 (a)) and the two drums of the winch 2 are wound and fed out and the front end portion (FIG. a) is provided with two wires 3 engaged with the pulley 1n at the lower end), and the stage body 1 is placed on the floor surface FL as described later by feeding and winding the wire 3 by the winch 2. It is folded horizontally and folded into the recess P of the wall surface W.

  3 (a) and 3 (e) are a plan view and a side view showing the folding and retractable stage of this embodiment in a transparent state, and FIG. 3 (b), FIG. 3 (c) and FIG. (D) is a cross-sectional view along the lines AA, BB and CC in FIG. 3 (a), and FIG. 4 (a) and FIG. It is the top view and expanded side view which fold up the folding storage type stage of an example, and show in a see-through | perspective state.

  As shown in FIGS. 3 and 4, the stage main body 1 includes a bent part 1a, a front frame 1b positioned on the front side of the bent part 1a, and a rear frame 1c positioned on the rear side of the bent part 1a. The top plate 1d stretched on each of the front frame 1b and the rear frame 1c, the front cover 1e provided at the front end of the front frame 1b, and both sides of the top plate 1d in the horizontally deployed state of the stage body 1 A side cover (not shown) that is detachably attached to the end portion is provided, and each of the front frame 1b and the rear frame 1c is integrally formed with, for example, five front-and-back direction girders each formed of a square pipe. And four left and right beam members connected to each other.

  Here, on the lower side of the front frame 1b, three front link members 1g each made of, for example, a square pipe are parallel to the three front and rear direction beams of the left and right ends and the center of the front frame 1b. Further, under the rear frame 1c, three rear link members 1h each made of, for example, a square pipe are arranged in parallel with the three front and rear direction beams of the left and right ends and the center of the rear frame 1c. The front end portions of the front frame 1b and the front link member 1g are pivotally supported by a front end bracket 1i extending in the left-right direction so as to be swingable in the vertical direction, while the rear end portions of the rear frame 1c and the rear link member 1h Is supported by the five rear end brackets 1j so as to be swingable in the vertical direction, and the rear end portions of the front frame 1b and the front link member 1g of the intermediate bracket 1k extending in the left-right direction of the bent portion 1a. On the other hand, the rear frame 1c and the front end of the rear link member 1h are pivotally supported by the rear portion of the intermediate bracket 1k extending in the left-right direction of the bent portion 1a. Yes.

  With this configuration, three sets of four-node parallel links are formed before and after the bent portion 1a, and the front end bracket 1i, the intermediate bracket 1k, and the rear end bracket 1j are vertically moved by the parallel movement function of the four-node parallel links. Four link support shafts as hinge shafts in which the front frame 1b and the rear frame 1c and the top plate 1d provided on the front frame 1b and the top frame 1d extend in the left-right direction at the bent portion 1a while maintaining the extended state to It is possible to swing between the horizontally deployed state and the bent state.

  The front cover 1e is provided around the both sides from the front end portion of the front end bracket 1i, and the front end bracket 1i is allowed to travel on the floor surface FL by five wheels 1q provided at the lower end portion thereof. The rear end bracket 1j has its lower end fixed on the floor surface FL in the recess P, and the intermediate bracket 1k has five adjustable legs 1m provided on the lower end on the floor surface FL. By making contact, the bent portion 1a is supported on the floor surface FL in a state where the stage body 1 is horizontally deployed.

  Furthermore, the folding storage type stage of this embodiment has an intermediate bracket 1k as a folding start mechanism for starting the folding of the stage main body 1 with the winding of the two wires 3, as shown in FIG. Two wire engaging shaft members 4 are provided in the lower part of the plate so as to extend horizontally in the left-right direction, and the deployment of starting the deployment of the stage body 1 as the two wires 3 are fed out is provided. As a starting mechanism, as shown in FIG. 4B, a front frame pushing spring 5 is provided, and the front frame pushing spring 5 swings, for example, the front frame 1b and the rear frame 1c to the intermediate bracket 1k, respectively. It consists of a helical spring inserted through two front and rear link support shafts that can be supported, one end of which is hooked to the intermediate bracket 1k and the other Part can be hooked to the front frame 1b or the rear frame 1c, and as the stage body 1 is bent, the other end is hooked to the front frame 1b or the rear frame 1c, and the helical spring is twisted. Thus, the urging force for elastically urging the front frame 1b and the rear frame 1c in a direction away from each other is maintained.

  5 (a) and 5 (b) are a plan view and a front view showing an enlarged main part of the winch of the folding and storing stage of the above embodiment, and FIG. 6 (a) and FIG. 6 (b). FIG. 5B is a cross-sectional view taken along lines DD and EE in FIG. 5B, and FIG. 6C is a side view seen from the direction of arrow F in FIG. As described above, the winch 2 in the folding storage type stage of this embodiment includes two drum support brackets 2a fixed on the floor surface FL, and axes around the drum support brackets 2a extending in the left-right direction. Two drums 2b that are rotatably supported, a connecting shaft 2c that connects the two drums 2b so as to be integrally rotatable, and one (left side in FIGS. 3A and 4A) drum support bracket 2a Provided on the outside of the A motor 2d with a speed reducer that rotationally drives a drum 2b supported by the support bracket 2a, and the motor 2d with a speed reducer incorporates a normal brake that brakes the output shaft when power supply to the motor is stopped. .

  One end of each of the two wires 3 is inserted and fixed in a wire fixing hole penetrating each end of the two drums 2b of the winch 2 in the diameter direction, and the other end of each of the wires 3 is fixed. The portion is connected and fixed to the two drum support brackets 2a of the winch 2, and the intermediate portion of the wires 3 can be swung in the vertical direction inside the front end bracket 1i and freely rotatable around an axis perpendicular to the swing axis. The two pulleys 1n that are pivotally supported are respectively hung on the lower side of the two wire engaging shaft members 4.

  Furthermore, the folding storage type stage of this embodiment is provided on each of the two drum support brackets 2a of the winch 2, and a wire tension lowering signal is obtained when either of the tensions of the two wires 3 falls below a predetermined level. And a motor controller 7 as a wire looseness restricting portion for restricting the looseness of the two wires 3 when the wire tension drop detecting portion 6 outputs the wire tension drop signal. 1-3)).

Here, the wire tension drop detection unit 6 is illustrated in FIGS. 7A to 7C as a moving member that moves so that the amount of movement increases as the tension of the wire 3 increases in accordance with the tension of the wire 3 . As described above, the drum 3 is supported by the drum support bracket 2a so as to be swingable in the vertical direction around an axis extending in parallel with the rotation axis of the drum 2b, and the wire 3 is connected to the central portion parallel to the swing axis from the lower side. A substantially U-shaped swinging arm 6a to be hung, and fixed to the center of the swinging arm 6a by, for example, welding and extending horizontally in front of the drum 2b. While the portion is biased downward and tension is applied to the wire 3 by its own weight, the swing height (swing amount) from the free state to the position lifted by the wire 3 increases as the tension of the wire 3 increases. the tension of the wire 3 so as Possess a steel swinging rod 6b that swings in the vertical direction in response to an increase or a decrease, also, as the movement amount decrease detecting unit amount of movement of the moving member for detecting a given case below, swinging the swinging rod 6b When the height becomes a predetermined value or less, the operating arm comes into contact with the swinging rod 6b to operate, and a normal limit switch 6c for outputting, for example, an OFF signal as a wire tension lowering signal to the motor controller 7 is provided.

  With this configuration, when the tension of one of the two wires 3 drops below a predetermined value, the wire tension drop detecting unit 6 reduces the swing height of the corresponding rocking rod 6b below a predetermined value. Since the limit switch 6c detects the decrease in the length and outputs an OFF signal, it is possible to reliably detect that the tension of the wire 3 has decreased below a predetermined value for any of the two wires 3. Here, the lengths of the two wires 3 are the same as those of the winch 2 after the stage body 1 is completely in the horizontal unfolded state when both the winding states of the wires 3 on the two drums 2b are normal. When the motor 2d with a speed reducer continues to rotate in the forward direction, the tension of the two wires 3 is reduced almost simultaneously, and the two limit switches 6c are set to output OFF signals almost simultaneously.

  Furthermore, in the folding storage type stage of this embodiment, as shown in FIGS. 3A and 4A, another normal limit switch 1o is provided on the side of the rear end bracket 1j at the right end in the figure. This limit switch 1o is, for example, when the operating arm is in a free state until the stage main body 1 is completely folded, and outputs an ON signal to the motor controller 7 so that the stage main body 1 is fully folded. The operating arm is operated by contacting the front end bracket 1 i, and an OFF signal is output to the motor controller 7.

  In addition, in the folding storage type stage of this embodiment, as shown in FIGS. 3 (a) and 4 (a), in the figure, there is still another one as a deployed state detection unit inside the rear end bracket 1j on the left end. A normal limit switch 1p is provided. The limit switch 1p is, for example, in a state where the operating arm is in a free state until the stage main body 1 is completely in a horizontally developed state, and outputs an OFF signal to the motor controller 7, and the stage main body. When 1 is completely in a horizontally deployed state, the operating arm comes into contact with the rear link member 1 h to operate, and an ON signal is output to the motor controller 7. The limit switch 1p is configured such that at least one of the limit switches of the wire tension lowering detection unit 6 when the stage body 1 is horizontally deployed when the winding state of the wire 3 on the two drums 2b is normal. Before the 6c outputs the OFF signal, the stage body 1 is set to detect the complete horizontal development state and output the ON signal.

  Furthermore, in the folding storage type stage of this embodiment, as shown in FIGS. 1, 3 (a), and 4 (a), in the drawing of the front end portion of the stage main body 1, blue that indicates a normal operation state is shown at the right end portion. And a display panel 8 provided with a connector and a remote controller 9 connected to the connector of the display panel 8, and a blue lamp of the display panel 8 and The red lamp and the control switch provided in the remote controller 9 are connected to the motor controller 7.

  The motor controller 7 here includes, for example, a normal microcomputer that operates based on a predetermined program and a normal motor driver that drives the motor under the control of the microcomputer. In accordance with the operation of the switch, the motor 2d with a speed reducer of the winch 2 is, for example, normally rotated when the stage body 1 is horizontally deployed, and is reversely operated, for example, when folded, and stopped at a desired position. When 1p outputs an ON signal, the forward rotation operation of the motor 2d with a speed reducer is stopped, and when the limit switch 1o outputs an OFF signal during folding, the reverse rotation operation of the motor 2d with a speed reducer is stopped. Or after that, or when folding If at least one of the limit switches 6c of the tension drop detecting unit 6 outputs an OFF signal, a slack that should not have occurred in at least one of the two wires 3 has occurred. When the motor 3d is in operation, the operation is stopped and the red lamp indicating the abnormal state is turned on. When the motor 2d with a speed reducer is not in operation after the horizontal deployment, the red lamp is blinked to Notify the occurrence of looseness.

  In the folding storage type stage of this embodiment, when the stage main body 1 is stored, the motor 2d with a speed machine of the winch 2 can be moved from the horizontal deployment state of the stage main body 1 by operating the control switch of the remote controller 9. The two drums 2 b are rotated to wind up the two wires 3, and along with the winding of the wires 3, first, the two wire engaging shafts 4 are brought into the stage main body 1 by the tension of the two wires 3. When the folding portion 1a is lifted to start the folding of the stage body 1 in the vertical direction, and the winch 2 winds up the two wires 3, the stage body 1 is moved vertically as shown in FIG. 2 (b). When the stage body 1 is folded into the folded state as shown in FIG. 2 (c) while being folded in, the operating arm of the limit switch 1o is moved to the front end brace. Tsu Doo 1i contacts and outputs the OFF signals to the motor controller 7, thereby the motor controller 7 stops operating the reducer-equipped motor 2d winch 2. During this folding, the front frame pushing spring 5 is twisted by the front frame 1b, the rear frame 1c, and the intermediate bracket 1k to hold an elastic force for pushing out, which will be described later.

  On the other hand, when the stage main body 1 is horizontally deployed, the motor 2d with the speed machine of the winch 2 rotates the two drums 2b in the reverse direction from when the stage main body 1 is folded and stored by operating the control switch of the remote controller 9. The two wires 3 are fed out, and as the wire 3 is fed out, first, the front frame pushing spring 5 is moved in a direction to separate the front frame 1b and the rear frame 1c from the intermediate bracket 1k by the elastic force. By energizing it so as to swing, the bent portion 1a of the stage main body 1 is expanded to start deployment of the stage main body 1, and thereafter, the intermediate portion of the stage main body 1 is lowered by its own weight and the front end of the stage main body 1 is lowered. Advances, and the stage main body 1 expands to a horizontal state.

  Then, when the stage main body 1 is in the horizontal unfolded state, the operating arm of the limit switch 1p comes into contact with the rear link member 1h, and the limit switch 1p outputs an ON signal to the motor controller 7, whereby two motor controllers 7 are provided. Before the tension of the wire 3 decreases too much, the motor 2d with a speed reducer of the winch 2 is stopped. On the other hand, when the tension of at least one of the two wires 3 drops below a predetermined value when the stage body 1 is horizontally deployed or thereafter, or when the stage body 1 is folded, the two swings of the wire tension drop detection unit 6 are reduced. The swinging height of the swinging rod 6b corresponding to the tension lowering wire of the dynamic rod 6b decreases below a predetermined value, and the corresponding limit switch 6b detects the decrease of the swinging height of the two limit switches 6b. An OFF signal as a wire tension lowering signal is output to the motor controller 7, whereby the motor controller 7 stops the operation of the motor 2 d with a speed reducer of the winch 2 and operates a red lamp indicating an abnormal state. Turn on to alert the operator of the folding and retractable stage. If the motor 2d with a speed reducer is not in operation after the horizontal deployment is finished, the red lamp blinks to notify the occurrence of the looseness of the wire 3. An operator who knows that the looseness of the wire 3 has occurred through these lamp displays, causes the motor 2d with a speed reducer to perform reverse rotation and forward rotation by operating the control switch of the remote controller 9, and the wire 3 on the drum 2b. Rewind.

  Therefore, according to the folding storage type stage of this embodiment, the stage main body 1 can be deformed between the folding storage state in the concave portion P of the wall surface W and the horizontal expansion state, and the stage main body 1 is horizontally expanded. Since the occurrence of loosening of the wire is restricted during or after or when the stage body 1 is folded, inconveniences in the life of the wire 3 and the smooth operation of the stage body due to the turbulent winding state of the wire 3 can be avoided. .

  In addition, according to the folding storage type stage of this embodiment, the wire tension drop detecting unit 6 has a swing rod 6b as a moving member that moves in accordance with the tension of the wire, and the moving amount of the moving member is less than a predetermined amount. Since it has a limit switch 6c as a movement amount decrease detection unit for detecting the case, when the tension of the wire 3 falls below a predetermined value, the tension drop of the wire can be reliably detected, Further, since the motor controller 7 stops the operation of the motor 2d with a speed reducer in accordance with the output signal of the limit switch 6c, the tension of the wire 3 is lowered to a predetermined value or less before the horizontal deployment of the stage body 1 is completed. In such a case, the stage main body 1 can be safely stopped by detecting this fact.

  Furthermore, according to the folding storage type stage of this embodiment, the motor controller 7 has another limit switch 1p for detecting that the stage body 1 is in the unfolded state, and the stage body 1 is in the fully unfolded state. In a state where the limit switch 1p does not detect this, when at least one of the two limit switches 6c outputs a wire tension lowering signal, a red lamp indicating an abnormal situation is turned on. The operator of the stage can easily know the occurrence of the abnormal situation, so that the operator operates the motor 2d with a speed reducer in the normal direction again by operating the control switch of the remote controller 9, and the stage main body 1 The stage body 1 is unfolded until the limit switch 1p is activated, and the stage body 1 is once fully unfolded. After the state, by and to perform the reverse operation and a normal rotation operation such as rewinding the wire 3 on the drum 2b to the reducer motor with 2d, it can be safely deal with the abnormal condition.

  As described above, the foldable and retractable stage of the present invention is not limited to the above-described example, and can be appropriately changed within the scope of the claims. For example, the folding start is performed. The mechanism may be one that starts bending the stage body only with the tension of the wire by extending the arm of the moment by placing the hinge axis of the bending part sufficiently higher than the pulling position of the wire, and starting bending The mechanism may be omitted, and the folding of the stage body may be started manually, for example. The deployment start mechanism may be a mechanism that provides a spring or the like that is given elastic force by the backward movement of the front frame when the stage body is bent, and starts the deployment of the stage body. The deployment of the stage body may be started manually. The hinge axis of the bent portion of the stage body may be three or less or five or more depending on the configuration of the bent portion, and the stage main body has three bent portions in the front-rear direction of the stage main body. You may provide in the above odd-numbered places and bend in a bellows shape.

  Further, the winch may be provided at the front end of the stage main body and movable with the stage main body, and the wire tension lowering detection unit mechanically outputs a signal when the lowering of the wire tension is detected. The wire loosening restricting portion may have a mechanical configuration in which a latch or the like is released by this mechanical signal to cut off the driving force to the drum and brake the drum. Then, when the limit switch 1p of the stage body 1 is omitted, the swinging rod 6b as the moving member that moves in accordance with the wire tension of the wire tension drop detecting unit 6, and the moving amount of the moving member is not more than a predetermined value. And a limit switch 6c as a movement amount decrease detection unit that detects the movement of the winch 2 by detecting the complete unfolded state of the stage body 1 by a decrease in the tension of the wire, thereby stopping the operation of the motor 2d with a reduction gear of the winch 2. May be.

  Thus, according to the folding storage type stage of the present invention, the stage main body can be deformed between the folded storage state on the wall or the like and the horizontal unfolded state, and at the time of horizontally deploying the stage main body, after that, or folding Occasionally, the occurrence of loosening of the wire can be regulated to avoid inconveniences in the life of the wire and the smooth operation of the stage main body due to the irregular winding state of the wire.

DESCRIPTION OF SYMBOLS 1 Stage body 1a Bending part 1b Front frame 1c Rear frame 1d Top plate 1e Front cover 1g Front link member 1h Rear link member 1i Front end bracket 1j Rear end bracket 1k Intermediate bracket 1m Leg 1n Pulley 1o, 1p Limit switch 1q Wheel 2 winch 2a drum support bracket 2b drum 2c connecting shaft 2d motor with speed reducer 3 wire 4 wire engaging shaft member 5 front frame pushing spring 6 wire tension drop detecting portion 6a swing arm 6b swinging rod 6c limit switch 7 motor controller 8 Display panel 9 Remote controller FL Floor P Recess W Wall

Claims (5)

A stage body (1) that can be bent vertically at a bending portion having a hinge shaft extending in the left-right direction;
A winch (2) provided at one end of the stage body in the front-rear direction;
A wire (3) that is wound and unwound by rotation of the drum of the winch and coupled or engaged with the other front-rear direction other end of the stage body;
In the folding storage type stage with
A wire tension drop detection unit (6) that outputs a wire tension drop signal while applying tension to the wire when the tension of the wire drops below a predetermined value;
A wire looseness restricting portion (7) for restricting the looseness of the wire when the wire tension drop detecting portion outputs the wire tension drop signal;
A foldable storage stage characterized by comprising The wire tension drop detection unit (6)
Moving members (6a, 6b) that move while applying tension to the wire so that the amount of movement increases as the tension of the wire (3) increases ,
A movement amount decrease detection unit (6c) for detecting a case where the movement amount of the moving member is equal to or less than a predetermined value;
The foldable and retractable stage according to claim 1, further comprising: The moving member is swingably supported around an axis extending in parallel with the drum rotation axis of the winch (2) so as to be hooked with the wire (3) and reverse to the swinging direction due to the tension of the wire. is its own weight or resiliently biased towards, so as swing amount tension greater of the wire is increased, the swinging member (6a to swing while giving tension due to its own weight or elastic force to the wire, 6b The folding storage type stage according to claim 2, wherein   The wire slack regulating part (7) has a drum rotation stop part for stopping the rotation of the drum of the winch (2) when the wire tension drop detection part (6) outputs the wire tension drop signal. The folding storage type stage according to any one of claims 1 to 3, wherein the folding storage stage is characterized by the following.   The wire slack regulating part (7) has a deployment state detection unit (1p) for detecting that the stage body (1) is in the deployed state, and that the stage body (1) is in the deployed state. A signal indicating an abnormal condition is output when the wire tension drop detecting unit (6) outputs the wire tension drop signal when the unfolded state detector is not detecting the wire tension drop. 5. The folding storage type stage according to any one of items 4 to 4.

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