JP2009113944A - Over-speed state detection device and stairway elevating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an over-speed state detection device capable of exactly detecting an over-speed state despite the compact-shaped device. <P>SOLUTION: A cam member 29 integrally rotating according to rotation of a rotating body comprises a cam surface 30 extended along a peripheral direction of the rotating body and extended to be gradually located on a diameter direction outer side as going to a rotating direction lower side of the rotating body and is constituted to contact and guide a driven body 32 on the cam surface 30 to be moved along the radial direction of the rotating body according to rotation of the rotating body. The driven body 32 is provided in a state in which flip-up amount to the radial direction outside from a maximum guide position located at the outermost radial direction outside when the driven body 32 is contacted and guided on the cam surface 30 becomes less than set amount when rotational speed of the rotating body is less than set rotational speed, and flip-up amount to the radial direction outside from the maximum guide position becomes set amount or more when the rotational speed of the rotating body is the set rotational speed or more. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an overspeed state detection device that detects an overspeed state in which the rotation speed of a rotating body is equal to or higher than a set rotation speed, and a stair lift that includes the overspeed state detection device.

  The overspeed state detection device is applied to equipment equipped with a lifting body that moves up and down along a lifting path such as a stair lift and an elevator, for example, and the rotational speed of a rotating body that rotates according to the movement of the lifting body Is used to detect whether the moving speed of the lifting body exceeds the set speed by detecting that the vehicle is in the overspeed state. Conventionally, there has been an apparatus configured as follows as applied to an elevator, for example.

  In other words, on a rotating body wrapped with a rope that moves in the longitudinal direction in accordance with the elevator car's elevation, it is movable radially outward and radially inward by the urging force of the return spring. A moving body to be urged to return is provided, and the rotational speed of the rotating body becomes equal to or higher than the set rotational speed, and the moving body is displaced by a set amount or more radially outward against the urging force of the return spring by centrifugal force. In some cases, an overspeed condition is detected. Specifically, the moving body displaced by a set amount or more radially outwardly contacts a detection switch for instructing a braking command to a control circuit that controls a brake that acts on the elevator car, and (For example, see Patent Document 1)

JP 2006-327708 A

  In the above conventional configuration, when the rotational speed of the rotating body becomes equal to or higher than the set rotational speed, the centrifugal force of the rotating body becomes large, and the moving body is radially outward against the return biasing force toward the radially inward side. Therefore, it is necessary to make the rotating body have a large diameter in order to obtain sufficient centrifugal force accompanying the rotation of the rotating body. There was a disadvantage of increasing the size. In particular, when the set rotational speed to be detected is set to a low speed, the apparatus becomes large.

  For example, the overspeed state detection device is applied to a device that travels at a relatively low speed, such as a stair lift, and detects an overspeed state of a rotating body that rotates as the device moves. In such a case, the set rotational speed corresponding to the overspeed state is set to a low rotational speed. Even at such a low rotational speed, the overspeed state is set using centrifugal force. In order to detect it, the rotating body provided with the moving body must have a large diameter so that a large centrifugal force can be obtained, and the size of the apparatus increases accordingly.

  An object of the present invention is to provide an overspeed state detection device capable of accurately detecting an overspeed state while being compact, and a stair lift provided with the overspeed state detection device. It is in.

The overspeed state detection device according to the present invention detects an overspeed state in which the rotational speed of the rotating body is equal to or higher than a set rotational speed, and the first characteristic configuration is integrated with the rotating body. A rotating cam member, and a driven body supported in a state of being movable and urged radially inward of the rotating body along the radial direction of the rotating body;
The cam member is operated to press the driven body with a cam surface extending along the circumferential direction of the rotating body and extending so as to be gradually located on the outer side in the radial direction toward the lower side in the rotational direction of the rotating body. Configured,
When the rotational speed of the rotating body is less than the set rotational speed, the maximum pressed force when it is assumed that the driven body is in contact with the maximum diameter portion located on the outermost radial direction side of the cam surface. When the amount of jumping outward in the radial direction from the operation position is less than the set amount, and the rotational speed of the rotating body is equal to or higher than the set rotational speed, it is radially outward from the maximum pressed operation position. It is in the point provided in the state in which the amount of flip-up to the side becomes equal to or more than the set amount.

  According to the first characteristic configuration, the cam member rotates integrally with the rotation of the rotating body, and the driven body is guided by the cam surface and moves in the radial direction as the cam member rotates. If the rotational speed of the rotating body is lower than the set rotational speed, it is radially outside the maximum pressed operation position when it is assumed that the cam surface is in contact with the largest diameter portion located on the most radially outer side of the cam surface. The amount of jump to the side is less than the set amount. However, since the cam surface is provided so as to be gradually positioned on the outer side in the radial direction toward the lower side in the rotational direction of the rotating body, when the rotational speed of the rotating body becomes high, the follower is accompanied by the rotation of the rotating body. The pressing force of the body toward the radially outward side by the cam surface increases. When the rotational speed of the rotating body becomes higher than the set rotational speed, the pressing force toward the radially outward side due to the guide action of the cam surface increases, and the driven body has a diameter larger than the maximum pressed operation position. Since the amount of jumping outward in the direction is equal to or greater than the set amount, it is possible to detect an overspeed state by utilizing the fact that the amount of jump is equal to or greater than the set amount.

  As described above, the cam surface is configured to detect an overspeed state by utilizing the fact that the driven body is flipped up radially outward by the pressing force of the cam surface accompanying the rotation of the rotating body. In order to detect the overspeed state of the rotator, the cam surface is configured such that when the rotator rotates by an angle corresponding to a unit rotation phase, the follower movably increases in the radially outward direction. Even if the set rotational speed is low, it is possible to increase the amount of follow-up to the outer side in the radial direction accompanying the rotation of the rotary body, and to increase the radial dimension. Even if not, it is possible to obtain a large pressing force for moving the follower radially outward by the cam surface, and it is possible to make the apparatus compact.

  Therefore, according to the first characteristic configuration, it is possible to provide an overspeed state detection device capable of accurately detecting an overspeed state while being compact.

  In addition to the first feature configuration, the second feature configuration of the present invention is swingable so that the follower moves a contact portion contacting the cam surface along the radial direction of the rotating body. It is in the point supported.

  According to the second characteristic configuration, since the follower is supported so as to be swingable so as to move a contact portion contacting the cam surface along a radial direction of the rotating body, the rotation As the body rotates, it is guided by the cam member and the driven body moves smoothly along the radial direction of the rotating body. For example, in order to support the follower movably in the radial direction of the rotating body, it may be possible to support the follower slidably in the radial direction of the rotating body. If supported, there will be a risk of wrinkling and the amount of springing of the driven body to the outside in the radial direction may be reduced due to the resistance caused by the wobbling. Since it moves, there is little possibility of dripping and the like, and it is possible to appropriately raise the follower radially outward.

  Therefore, according to the second feature configuration, the follower can be smoothly moved, and the follower can be appropriately jumped outward in the radial direction, thereby accurately detecting the overspeed state. An overspeed state detection device capable of achieving the above has been provided.

  In addition to the first feature configuration or the second feature configuration, the third feature configuration of the present invention is such that the cam surface is closer to the lower side in the rotational direction of the rotating body, and radially outward with respect to the unit rotational phase of the rotating body. This is in the state where the amount of change in the position of is large.

  According to the third characteristic configuration, since the cam surface is closer to the lower side in the rotational direction of the rotating body, the amount of change in the radially outward side relative to the unit rotational phase of the rotating body becomes larger. Compared with the case where the amount of change in the radially outward position relative to the unit rotational phase of the rotating body is the same over the entire region, the rotating body rotates by the unit rotational phase when the lower side in the rotational direction of the cam surface guides contact. Since the amount of displacement of the follower in the radially outward direction is large, the pressing force in the jumping direction increases accordingly, and the force to lift the follower outward in the radial direction is increased accordingly. It will be big. As a result, even if the set rotational speed corresponding to the overspeed state of the rotating body is set to a low speed, it is possible to jump the driven body above the set amount, and the overspeed state of the rotating body is appropriately set. Can be detected.

  Therefore, according to the third characteristic configuration, even if the set rotational speed as the overspeed state of the rotating body is set to a low speed, the overspeed that can appropriately detect the overspeed state of the rotating body. A state detection device can be provided.

  According to a fourth feature configuration of the present invention, in addition to any one of the first feature configuration to the third feature configuration, the cam member includes a plurality of cam surfaces arranged in a circumferential direction of the rotating body. There is in point.

  According to the fourth feature configuration, since the plurality of cam surfaces are provided in a state of being arranged in the circumferential direction of the rotating body, the follow-up operation of the driven body by the cam surface is performed a plurality of times during one rotation of the rotating body. Whether or not the rotating body is in an overspeed state can be detected at short intervals. For example, even if the set rotation speed corresponding to the overspeed state of the rotating body is set to a low speed, the rotating body rotates as fast as possible. It becomes possible to detect an overspeed state of the body.

  Therefore, according to the fourth feature configuration, it is possible to provide an overspeed state detection device capable of detecting as soon as possible that the overspeed state has been reached.

According to a fifth feature configuration of the present invention, in addition to any one of the first feature configuration to the fourth feature configuration, the amount by which the follower is flipped radially outward from the maximum operated position is the set amount. An engaging member that engages with the follower when the above is provided is provided in a state of rotating integrally with the rotating body,
A holding member is provided in a state of being rotatable around the rotation axis of the rotating body and being held at a set phase around the rotation axis,
When the follower is engaged with the engaging member, the holding member is supported by the holding member in such a form that the holding member rotates around the rotation axis by the rotational force of the rotating body.

  According to the fifth characteristic configuration, the rotational speed of the rotating body is equal to or higher than the set rotational speed, and the follower is flipped up radially outward from the maximum pressed operation position is equal to or greater than the set amount. Then, the engaging member that rotates integrally with the rotating body is engaged with the driven body. When the engaging member and the driven body are engaged, the holding member is rotated around the rotation axis of the rotating body by the rotational force of the rotating body.

  Thus, the rotational speed of the rotating body is set to rotate by mechanically linking the engaging member that rotates integrally with the rotating body to rotate the holding member that supports the driven body by engaging the driven body. It is possible to accurately detect the overspeed state that is higher than the speed by the mechanical displacement of the holding member. In addition, measures are taken to avoid the overspeed state when the overspeed state of the rotating body occurs, such as operating a member for mechanically braking the rotation of the rotating body with the rotation of the holding member. There is an advantage that can be made easy.

  Therefore, according to the fifth characteristic configuration, it is possible to accurately detect an overspeed state in which the rotational speed of the rotating body is equal to or higher than the set rotational speed, and when the overspeed state of the rotating body has occurred. Thus, it has become possible to provide an overspeed detection device that can easily take measures for avoiding the overspeed state.

  According to a sixth characteristic configuration of the present invention, in addition to the fifth characteristic configuration, when the holding member rotates around the rotation axis, the rotating member rotates by contacting the holding member for braking on the fixed side. This is in that a braking action portion for preventing the above is provided.

  According to the sixth characteristic configuration, when the rotation speed of the rotating body becomes equal to or higher than the set rotation speed, and the holding member that supports the driven body is rotated by the engagement of the engaging member and the driven body, the holding is performed. When the braking action part provided in the member contacts the braking receiving part on the fixed side, the rotation of the rotating body can be prevented.

  Therefore, according to the sixth feature, the rotation of the rotating body can be mechanically braked with the rotation of the holding member, and the mechanical braking is performed when an overspeed state of the rotating body occurs. An overspeed state can be avoided by the action, and an overspeed state detection device capable of improving safety can be provided.

  According to a seventh feature configuration of the present invention, in addition to the fifth feature configuration or the sixth feature configuration, the holding member is provided with a switch operation unit that operates a detection switch when the holding member rotates around the rotation axis. In the point.

  According to the seventh characteristic configuration, when the rotation speed of the rotating body is equal to or higher than the set rotation speed, and the holding member that supports the driven body is rotated by the engagement of the engaging member and the driven body, the holding is performed. The detection switch is operated by a switch operation unit provided on the member. Based on the detection information of the detection switch, for example, it is possible to take measures based on electrical control such as operating the electric braking means or operating the alarm means.

  Therefore, according to the seventh characteristic configuration, the detection switch can be operated with the rotation of the holding member, and when the overspeed state of the rotating body occurs, the It has become possible to provide an overspeed detection device that can take measures based on accurate control and can improve safety.

An eighth characteristic configuration of the present invention is a stair lift including the overspeed detection device according to any one of claims 1 to 7,
An elevating body is provided that includes a drive sprocket that meshes with a meshing long member disposed on a guide rail provided along a staircase, and a drive means that drives the drive sprocket, and that is movable up and down along the guide rail. ,
The overspeed state detecting device is provided in the lifting body in a form in which the rotating body meshes with the meshing long member.

  According to the eighth characteristic configuration, when the drive sprocket is driven by the drive means, the drive sprocket meshes with the meshing long member, so that the lifting body moves up and down along the guide rail. The overspeed state detection device is provided in the lifting body in such a form that the rotating body meshes with the meshing long member, so that it is provided separately from the driving sprocket that is subjected to the load of the lifting body and the driving reaction force by the driving means. Even if the drive sprocket is broken and idle by detecting an overspeed state in which the rotational speed of the rotating body engaged with the meshing long member is equal to or higher than the set rotational speed, It is possible to detect that the elevating body is moving on the guide rail at a moving speed exceeding the set speed.

  Therefore, according to the eighth characteristic configuration, it is possible to accurately detect that the elevating body is moving along the guide rail at a speed exceeding the set speed, and the elevating body is detected at a speed exceeding the set speed. In order to avoid moving, a stair lift that can take safety measures such as braking the movement of the lifting body can be provided.

Hereinafter, an embodiment of an overspeed state detection device and a stair lift according to the present invention will be described with reference to the drawings.
FIG. 1 shows a stair lift according to the present invention. This stair lift is a chair type stair lift capable of moving up and down a stair while a person who is difficult to walk, such as a disabled person or an elderly person, is seated. This stair lift is configured such that a lift unit U as a lift is supported by a guide rail 1 provided in a fixed position along the slope of the stair K so as to be lifted and lowered.

  The guide rail 1 is a long member formed of an aluminum extruded material having a cross-sectional shape as shown in FIGS. 2 and 5, and a chain guide groove along the long direction is formed on the upper surface of the guide rail 1. 3 is formed, and in this chain guide groove 3, a chain 4 as a meshing long member covering almost the entire length in the longitudinal direction of the guide rail 1 is disposed in a fixed state. On both the left and right sides of the guide rail 1, roller guide grooves 6 having a substantially cross-sectional rectangular shape for engaging and guiding a guide roller 5 for travel guidance described later are formed along the longitudinal direction.

  The lifting unit U is configured by integrally connecting a chair 2 on which a user is seated and a traveling drive unit 7 for driving the chair 2 up and down, and is supported so as to be movable up and down with respect to the guide rail 1. It has a configuration.

Next, the configuration of the travel drive unit 7 will be described.
As shown in FIG. 1, the traveling drive unit 7 is a drive that rotationally drives a drive sprocket 9 that is integrally provided on the back of a support leg 8 that is connected to the lower portion of the chair 2 and meshes with the chain 4. An electric motor 10 with a speed reduction mechanism as means is provided and supported so as to be movable in the longitudinal direction of the guide rail 1.

  In other words, as shown in FIG. 2, the travel drive unit 7 includes a support frame 11 so as to cover the upper part of the guide rail 1 and both the left and right sides of the guide rail 1 as shown in FIG. As shown, this support frame 11 is provided with a pair of guide rollers 5 for traveling guidance that are rotatably supported around a horizontal axis at intervals on the left and right sides along the moving direction of the chair 2. The electric motor 10 is attached to one side of the support frame 11 in a state of being integrally connected via the motor connecting plate 12. That is, the travel drive unit 7 is configured to be supported by the total of four guide rollers 5 for travel guidance so as to be movable in the longitudinal direction of the guide rail 1 while integrally supporting the chair 2.

  As shown in FIGS. 2 to 4, the drive sprocket 9 is attached to the output shaft 10 a of the electric motor 10 in a state of being located at the upper part of the chain 4, and the insertion hole 14 formed at the upper part of the support frame 11. The drive sprocket 9 enters the inside of the support frame 11 and meshes with the chain 4. Therefore, when the drive sprocket 9 is rotationally driven by the electric motor 10, the lifting unit U, that is, the chair 2 and the traveling drive unit 7 can be moved up and down integrally along the guide rail 1 as the drive sprocket 9 rotates. It can be done.

  Further, an electromagnetic brake 15 is provided as an electric braking means that can be switched between a braking state for braking the electric motor 10 and a braking release state for releasing the braking. The electromagnetic brake 15 is configured to be in a braking state by applying a braking force by a spring (not shown) when not energized, and to be released from the braking force by energizing excitation. Further, when the chair 2 is not moved, the electromagnetic brake 15 can be set in a braking state to hold the position of the chair 2, and when the chair 2 is moved up and down, the electromagnetic brake 15 is switched to a braking release state and the electric motor is operated. The chair 2 can be moved up and down by driving 10.

  As shown in FIG. 1, an elevation command switch 17 that commands the ascending movement of the chair 2 and a descending command switch 18 that commands the descending movement of the chair 2 are provided on the front surface of the armrest 16 provided on the chair 2. Yes. In addition, a seating switch 19 is provided at the seating portion of the chair 2 to detect that the user is seated by applying the weight of the user seated on the chair 2. And as shown in FIG. 13, the control apparatus 20 which controls the drive state of the electric motor 10 based on the detection information of the raising command switch 17, the lowering command switch 18, and the seating switch 19 is provided. When the raising command switch 17 or the lowering command switch 18 is turned on while the seating switch 19 is on, the operation of the electric motor 10 is controlled so that the chair 2 moves and travels in the commanded movement direction. It is configured as follows.

  In this stair lift, when the chair 2 is moved up and down by driving the electric motor 10 based on the command of the ascending command switch 17 or the descending command switch 18, it is moved at the normal operation speed (6 m / min). The rotation speed of the electric motor 10 is set in advance. If the movement speed at which the chair 2 moves in the descending direction becomes an excessively set rotation speed (for example, 12 m / min or more) compared to the set speed, the chair 2 moves. Is provided with an emergency stop device 21 for emergency stop.

  By the way, the case where the moving speed at which the chair 2 moves in the descending direction is equal to or higher than the set rotational speed is because, for example, a person exceeding the allowable weight is seated on the chair 2 and uses the stair lift, so the descending speed is high. Or a case where the electromagnetic brake 15 breaks down and the braking function cannot be exhibited.

  The emergency stop device 21 is in an overspeed state in which the rotation speed of the overspeed detection sprocket 22 as a rotating body that rotates at a rotation speed corresponding to the movement speed when the chair 2 moves is equal to or higher than the set rotation speed. It is comprised so that it may detect, and if the overspeed state is detected, it is comprised so that rotation of the sprocket 22 for overspeed detection can be stopped in an emergency. Therefore, this emergency stop device 21 constitutes an overspeed state detection device.

  The emergency stop device 21 includes a cam member 29 that rotates integrally with the overspeed detection sprocket 22, and is movable along the radial direction of the overspeed detection sprocket 22 and the overspeed detection sprocket 22. And a follower 32 that is supported while being urged to move radially inward, and a cam member 29 extends along the circumferential direction of the overspeed detection sprocket 22 and the overspeed detection sprocket 22 The follower 32 is configured to be pressed by a cam surface 30 extending so as to be gradually located outward in the radial direction toward the lower side in the rotation direction. The follower 32 has a rotational speed of the overspeed detection sprocket 22. When the rotational speed is lower than the set rotational speed, the diameter is larger than the maximum pressed operation position (see FIG. 8B) when it is assumed that the cam surface 30 is in contact with the maximum diameter portion located on the most radially outward side. Out of direction When the amount of jumping to the side is less than the set amount and the rotation speed of the overspeed detection sprocket 22 is equal to or higher than the set rotation speed, the jumping to the radially outward side from the maximum pressed operation position It is provided in a state where the amount is equal to or greater than the set amount.

  The follower 32 is swingably supported so as to move a cam roller 31 as a contact portion contacting the cam surface 30 along the radial direction of the overspeed detection sprocket 22. The cam member 29 includes a plurality of cam surfaces 30 arranged in the circumferential direction of the rotating body.

  Further, an engagement protrusion as an engagement member that engages with the driven body 32 when the amount of the outward movement of the driven body 32 radially outward from the maximum operated position is equal to or larger than the set amount. 40 is provided in a state of rotating integrally with the overspeed detection sprocket 22 and is rotatable around the rotation axis of the overspeed detection sprocket 22 and held in a set phase around the rotation axis. A holding member 26 is provided. The follower 32 is supported by the holding member 26 in a form in which the holding member 26 rotates around the rotation axis by the rotational force of the overspeed detection sprocket 22 when engaged with the engagement protrusion 40. Has been.

Hereinafter, a specific configuration of the emergency stop device 21 will be described.
As shown in FIG. 1, the emergency stop device 21 is provided in a state of being attached and fixed to the support frame 11 so as to be positioned on the lowering direction side of the chair 2 with respect to the drive sprocket 9, and as shown in FIG. Each member is mounted on a support plate 23 that is bent in a substantially Z-shape when viewed from the side and whose lower side portion 23A is bolted to the support frame 11.

  As shown in FIGS. 6 and 7, the upper support portion 23 </ b> B of the support plate 23 is bolted to a shaft support member 24 that is positioned below and formed in a substantially gate shape when viewed in the movement direction of the chair 2. The overspeed detection sprocket 22 is rotatably supported in a state in which the shaft 4 is engaged with the support shaft 25 that is installed and supported across the left and right side portions of the support member 24. Since this overspeed detection sprocket 22 is provided in mesh with the chain 4, it rotates around the axis of the support shaft 25 at a rotational speed corresponding to the moving speed of the chair 2 as the chair 2 moves up and down. It will be.

  A plate-like holding member 26 is supported on the support shaft 25 so as to be relatively rotatable in a state where the support shaft 25 is aligned with the overspeed detection sprocket 22 at intervals along the axial direction. The holding member 26 is formed in a substantially rectangular shape when viewed in the axial direction of the support shaft 25, is urged to rotate toward one side in the circumferential direction of the support shaft 25 by a coil spring 27, and the support member 24. Is received and supported against the urging force of the coil spring 27 by a receiving pin 28 attached to the shaft, and is supported by the support shaft 25 in a state where the position is held at a predetermined phase.

  A cam member 29 is provided at one side of the overspeed detection sprocket 22 on the holding member 26 side so as to rotate integrally with the overspeed detection sprocket 22. Three cam surfaces 30 are formed on the outer circumferential surface of the cam member 29 so as to be arranged in a substantially triangular shape along the circumferential direction. A follower 32 having a cam roller 31 as a contact portion that is contacted and guided to these cam surfaces 30 is provided in a state of being supported by the holding member 26 so as to be swingable around the horizontal axis.

  As shown in FIGS. 7 and 8, the follower 32 is formed in a substantially rectangular shape in a side view, and a roller disposing portion 33 on one end side in the longitudinal direction thereof is a plan view so as to rotatably support the cam roller 31. The cam roller 31 is rotatably supported by a support shaft 35 provided over the arm portions 34 located on both the left and right sides, and the opposite side of the roller arrangement portion 33 is provided in a solid shape so that a balance weight portion is provided. 36 is formed. The follower 32 is laterally parallel to the rotation axis of the overspeed detection sprocket 22, that is, the axis of the support shaft 25, by the pivot pin 37 at an intermediate position between the roller arrangement portion 33 and the balance weight portion 36. The holding member 26 is supported so as to be swingable around the axis.

  A torsion coil spring 38 that swings and biases the cam roller 31 toward the cam surface 30 is attached to the swing fulcrum of the follower 32. The torsion coil spring 38 is easy to adjust the oscillating biasing force to a set value. As described above, the follower 32 balances the weight of the roller disposing portion 33 and the weight of the balance weight portion 36, and thus the torsion coil spring 38 The biasing force by the coil spring 38 corresponds to the pressing force with which the cam roller 31 is pressed against the cam surface 30, so that the pressing force with which the cam roller is pressed against the cam surface 30 can be easily adjusted.

As shown in FIG. 8, the cam roller 31 is guided to contact with the cam surface 30 of the cam member 29 with the cam roller 31 positioned slightly below the swing fulcrum position, so that the overspeed detection sprocket 22 The cam member 29 rotates with the rotation, so that the cam roller 31 moves along the radial direction of the overspeed detection sprocket 22, and can swing around the place where the follower 32 is separated from the cam surface 30. It is supported by the holding member 26.
A small-diameter portion 29 a for preventing the arm portion 34 of the follower 32 from interfering with the cam surface 30 is formed at a location on the cam member 29 on the overspeed detection sprocket 22 side with respect to the cam surface 30. (See FIG. 7).

  The three cam surfaces 30 formed on the cam member 29 are provided so as to form a substantially equilateral triangle with the axis of the support shaft 25 as the center, and each of the cam surfaces 30 is arranged around the sprocket 22 for overspeed detection. It extends along the direction, and is formed in a state of extending so as to be gradually located on the outer side in the radial direction toward the lower side in the rotational direction of the overspeed detection sprocket 22.

  In other words, as shown in FIG. 8, as the cam member 29 rotates, the separation distance from the rotation axis at the position where the cam roller 31 contacts is successively changed, but the cam surface 30 is centered in the rotation direction. When the cam member 29 further rotates from that position, the distance from the rotation axis gradually increases (see FIG. 8A). Accordingly, the cam surface 30 is formed so as to be gradually positioned on the outer side in the radial direction toward the lower side in the rotational direction of the overspeed detection sprocket 22, and the cam member 29 rotates in the cam surface 30. Thus, the driven body 32 is pressed toward the radially outer side.

  When the rotation speed of the overspeed detection sprocket 22 is a normal rotation speed, that is, a rotation speed corresponding to a state in which the chair 2 moves at a normal operation speed (6 m / min), the follower 32 is driven by a torsion coil spring 38. When the cam member 29 rotates, the follower 32 moves in the radial direction while being guided by contact along the cam surface 30. .

  When the rotational speed of the overspeed detection sprocket 22 is equal to or higher than the set rotational speed, that is, the rotational speed corresponding to the state in which the chair 2 moves at the set rotational speed (12 m / min), the rotation of the cam member 29 is performed. The maximum pressed operation position when it is assumed that the speed increases and the cam surface 30 is in contact with the maximum diameter portion 30A located on the outermost radial direction of the cam surface 30 by the pushing force in the oblique direction (FIG. 8 ( The biasing force by the torsion coil spring 38 is adjusted so as to correspond to the pressing force by the cam surface 30 so as to be flipped up radially outward by a set amount or more than the reference b).

  As shown in FIGS. 7 and 11, the follower 32 has an engaging portion 39 that is bent and formed in an L shape in a side view at a location on the overspeed detection sprocket 22 side of the roller arrangement portion 33. It is integrally formed. On the other hand, three engagement protrusions 40 as engagement members are provided at appropriate intervals in the circumferential direction in a state of rotating integrally with the cam member 29. The engaging protrusion 40 is engaged with the engaging action portion 39 of the driven body 32 when the driven body 32 is flipped up radially outward by a set amount or more than the maximum pressed operation position. (See FIG. 10).

  By the way, in this embodiment, the cam member 29 and the engagement protrusion 40 are processed on the same base material so that the cam surfaces 30 and the engagement protrusions 40 are not displaced in the rotational direction. However, the cam member and the engaging member may be configured separately and assembled integrally.

  When the engagement protrusion 40 is fitted into and engaged with the recess of the engagement action portion 39 formed in an L shape, the engagement protrusion 40 is excessively engaged with the engagement action portion 39 of the follower 32 in this manner. The rotational force of the speed detecting sprocket 22 acts, and the rotational force is transmitted to the holding member 26 via the engaging protrusion 40 and the driven body 32, and the holding member 26 resists the biasing force of the coil spring 27. The positional relationship of each member of the driven body 32, the engagement protrusion 40, and the holding member 26 is set so as to rotate around the axis of the support shaft 25.

  That is, as shown in FIGS. 9, 11, and 12, when the engaging protrusion 40 engages with the engaging action portion 39 and the rotational force of the overspeed detection sprocket 22 acts, the rotational force is driven by the follower 32. The direction in which the pivot pin 37 is pushed by the rotational force is a direction in which the retaining member 26 can be rotated in accordance with the urging force of the coil spring 27. The position of the pivot pin 27 with respect to the holding member 26 is set so that a force acts so as to rotate it.

  The holding member 26 has a braking action in which a lower end side, that is, a side toward the guide rail 1 and an end portion located on the lowering direction side is brought into contact with an upper surface of the guide rail 1 as an example of a brake receiving part. A portion 41 is formed. The braking action portion 41 has an anti-slip structure in which a number of fine corrugated plate-like irregularities are formed. The braking action portion 41 acts on the upper surface of the aluminum guide rail 1 while biting into the upper surface of the sprocket 22 for detecting overspeed. It is configured to forcibly brake the rotation. And the movement to the descent | fall side of the chair 2 can be prevented by this.

  The emergency stop device 21 is a detection switch that can be switched between a braking command state (ON state) for switching the electromagnetic brake 15 to a braking state and a non-braking command state (OFF state) for switching the electromagnetic brake 15 to a non-braking state. And a switch operating unit 43 that operates the limit switch 42 as the holding member 26 rotates about the axis of the support shaft 25.

  In addition, as shown in FIGS. 7, 9, 11, and 12, the electromagnetic brake 15 is turned on and off on the switch mounting member 44 that is bolted to the vertical surface portion 23 </ b> C of the support plate 23. A limit switch 42 for switching operation is mounted in a fixed state, and when the holding member 26 rotates in a predetermined rotation direction, the switch mounting member 44 is contacted with the rotation of the holding member 26. A swing arm 45 that is operated to swing the balance around an axis parallel to the rotation axis of the holding member 26 is pivotally supported, and a substantially L-shaped bend is formed at the other end of the swing arm 45. The operation plate 46 is attached in a state of being integrally connected. Further, the operation plate 46 is configured to be bolted to the swing arm 45 through a long hole 47 so that the mounting position can be changed and adjusted along the swing operation. Can be adjusted to the proper position. Accordingly, the switch operating portion 43 is constituted by the swing arm 45 and the operation plate 46.

  The emergency stop device 21 operates so as to emergency stop the movement of the chair 2 when the chair 2 moves in the downward direction and the chair 2 moves at a set rotational speed (12 m / min). However, the operation of the emergency stop device 21 will be described below.

  When the rotation speed of the overspeed detection sprocket 22 is a normal rotation speed, that is, a rotation speed corresponding to a state in which the chair 2 moves at a normal operation speed (6 m / min), the follower 32 is driven by a torsion coil spring 38. When the cam member 29 is rotated by the urging force, the follower 32 moves in the radial direction while being abutted and guided along the cam surface 30. That is, as shown in FIG. 8, the cam roller 31 is guided to contact while drawing a certain locus on the cam surface 30 without substantially rising from each cam surface 30 of the cam member 29.

  However, when the rotation speed of the overspeed detection sprocket 22 is equal to or higher than the set rotation speed, that is, the rotation speed corresponding to the state in which the chair 2 moves at the set rotation speed (12 m / min), the cam roller 31 When guided by the surface 30, the rotational speed of the cam member 29 increases, and the pushing-up force in the oblique direction of the cam surface 30 becomes greater than the spring biasing force of the torsion coil spring 38, so that the follower 32 is moved to the maximum object. A state in which the actuator is flipped up radially outward by a set amount or more than the pressing operation position (see FIG. 10).

  As a result, as shown in FIG. 10B, any one of the three engaging protrusions 40 is engaged with the engaging action portion 39 of the driven body 32 at that time. Then, since the load of the chair 2 is applied and a force to move in the downward direction is applied, the overspeed detection sprocket 22 tries to rotate further, but is held via the engaging protrusion 40 and the follower 32 by the rotational force. This is transmitted to the member 26, and the holding member 26 rotates around the axis of the support shaft 25 against the urging force of the coil spring 27. As a result, as shown in FIG. 12, the braking action portion 41 formed on the holding member 26 can act on the upper surface of the guide rail 1 to prevent the chair 2 from moving downward. .

  Furthermore, as shown in FIG. 12, as the holding member 26 rotates around the axis of the support shaft 25 against the urging force of the coil spring 27, the swinging arm 45 is brought into contact with the holding member 26. Is swung so that the switch operation plate 46 is swung integrally to push the detection piece 42a of the limit switch 42. As a result, the electromagnetic brake 15 is switched to the braking state, and the output shaft 10a of the electric motor 10 is braked. As a result, the overspeed detection sprocket 22 is prevented from rotating.

  Therefore, if the electromagnetic brake 15 is in a normal operating state, the braking action by the electromagnetic brake 15 is exhibited in addition to the braking action by the contact of the braking action part 41 with the guide rail 1, and the braking action by the two systems is excessive. The rotation of the speed detecting sprocket 22 can be stopped to prevent the chair 2 from moving in the downward direction.

[Another embodiment]
Hereinafter, other embodiments are listed.

(1) In the above-described embodiment, the cam surface 30 formed on the cam member 29 is formed by the linearly extending cam surface 30, and the change in the position of the rotating body toward the radially outward side with respect to the unit rotational phase. Although the guide surface having a constant amount is formed, instead of such a configuration, the cam surface 30 is closer to the lower rotation direction of the rotating body with respect to the unit rotation phase of the rotating body. It may be formed on a guide surface in which the amount of change in the radially outward position is large.

  For example, as shown in FIG. 14A, the cam surface 30 is shaped such that the lower side in the rotational direction is bent outward in the radial direction, so that the lower side in the rotational direction is radially outward with respect to the unit rotational phase. It may be formed in a state where the amount of change in position to the side becomes large. Further, the configuration is not limited to the one that is bent linearly, and may be a configuration that bends in a smooth arc shape toward the outer side in the radial direction toward the lower side in the rotation direction of the rotating body.

(2) In the above embodiment, the cam member 29 is configured by arranging the three cam surfaces 30 in the circumferential direction. For example, as shown in FIG. Various types of cam members 29 can be used, such as a configuration in which four are arranged in the direction or a configuration in which only one cam surface 30 is provided in a part in the circumferential direction.

(3) In the above-described embodiment, the configuration in which the follower is swingably supported has been illustrated. However, the configuration is not limited to such a configuration, and the follower is supported so as to be slidable in the radial direction of the rotating body. Also good.

(4) In the above-described embodiment, when the follower is engaged with the engagement member when the amount of springing outward in the radial direction from the maximum pressed operation position is equal to or greater than a set amount. Although the configuration in which the holding member is configured to rotate by the rotational force of the rotating body is shown in the above, instead of such a configuration, the driven body is radially outward from the maximum pressed operation position. A configuration may be provided in which a detection switch that detects and operates when the follower comes into contact with the actuator is operated and braked by operating the actuator based on the detection information.

(5) In the above-described embodiment, a configuration in which the overspeed state detection device is provided in a stair lift is shown. However, as a configuration provided in another device, for example, a lifting device having a lifting body that is movable up and down in the vertical direction, lifting and lowering It is good also as a structure which detects the overspeed state of the rotary body rotated with raising / lowering of a body. In that case, the structure may be provided with an overspeed state detection device in the lifting body, and the rotating body is provided by engagement with a long body that is provided with the overspeed state detection device in a fixed portion and moves as the lifting body moves. You may comprise so that it may rotate.

Partial cutaway side view of stair lift Longitudinal front view of travel drive Side view of travel drive Top view of travel drive Longitudinal front view of travel drive Perspective view of emergency stop device Exploded perspective view of emergency stop device Action diagram of cam member Perspective view of emergency stop device Action diagram of cam member Diagram showing the configuration of the emergency stop device Action diagram when rotating holding member Control block diagram The figure which shows the cam member of another embodiment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Guide rail 4 Engagement type elongate member 10 Drive means 22 Rotating body 26 Holding member 29 Cam member 30 Cam surface 32 Follower 40 Engagement member 41 Braking action part 42 Detection switch 43 Switch operation part U Lifting body

Claims (8)

An overspeed state detection device that detects an overspeed state in which the rotation speed of the rotating body is equal to or higher than a set rotation speed,
A cam member that rotates integrally with the rotating body; and a driven body that is supported while being urged to move radially inward of the rotating body along the radial direction of the rotating body. Provided,
The cam member presses the follower with a cam surface extending along the circumferential direction of the rotating body and extending so as to be gradually positioned outward in the radial direction toward the lower side in the rotational direction of the rotating body. Configured,
When the rotational speed of the rotating body is less than the set rotational speed, the maximum pressed force when it is assumed that the driven body is in contact with the largest diameter portion located on the outermost radial direction side of the cam surface. When the amount of jumping outward in the radial direction from the operation position is less than the set amount, and the rotational speed of the rotating body is equal to or higher than the set rotational speed, it is radially outward from the maximum pressed operation position. An overspeed state detection device provided in a state in which the amount of flip-up to the side is equal to or greater than the set amount.   The overspeed state detection device according to claim 1, wherein the driven body is swingably supported so as to move a contact portion that contacts the cam surface along a radial direction of the rotating body.   The said cam surface is provided in the state in which the amount of change of the position to the radial direction outer side with respect to the unit rotation phase of the said rotary body becomes large toward the rotation direction lower side of the said rotary body. Overspeed detection device.   The overspeed state detection device according to any one of claims 1 to 3, wherein the cam member includes a plurality of cam surfaces arranged in a circumferential direction of the rotating body. An engagement member that engages with the follower when the follow-up amount of the follower to the radially outward side from the maximum operated position is equal to or larger than the set amount is integrally formed with the rotating body. Provided in a rotating state,
A holding member is provided in a state of being rotatable around the rotation axis of the rotating body and being held at a set phase around the rotation axis,
The said holding member is supported by the said holding member in the form which the said holding member rotates around the said rotating shaft center with the rotational force of the said rotary body, when the said follower engages with the said engagement member. The overspeed state detection device according to any one of 4.   6. The braking member according to claim 5, wherein the holding member is provided with a braking action part that contacts the braking receiving part on the fixed side and prevents the rotation of the rotating body when the holding member rotates around the rotation axis. Fast state detection device.   The overspeed state detection device according to claim 5 or 6, wherein the holding member is provided with a switch operation unit that operates a detection switch when the holding member rotates around the rotation axis. A stair lift comprising the overspeed detection device according to any one of claims 1 to 7,
An elevating body is provided that includes a drive sprocket that meshes with a meshing long member disposed on a guide rail provided along a staircase, and a drive means that drives the drive sprocket, and that is movable up and down along the guide rail. ,
The overspeed state detection device is a stair lift provided in the lifting body in a state where the rotating body meshes with the meshing long member.

Images