JP2005219882A - Safety device for elevator for wheel chair and elevator for wheel chair equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a safety device for an elevator for a wheel chair provided in the elevator for the wheel chair and capable of detecting a position of an elevating member and preventing the elevating member of the elevator for the wheel chair from being unable to elevate and lower mechanically even if a position detection means for deciding an elevating possible scope of the elevating member causes failure. <P>SOLUTION: This safety device is constituted in such a way that a limit switch operates when foreign matter comes into contact with a contact plate to stop elevating or lowering operation of the elevating member and this safety device is provided in a table part and a connection member of the elevator for the wheel chair, respectively. When the position detection means causes failure, this safety device operates irrespective of existence of foreign matter while the table part elevates or lowers from an upper limit position or a lower limit position to a position where the elevating member of the elevator for the wheel chair cannot elevate or lower mechanically to stop elevating or lowering operation of the table part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a safety device in an elevator for a wheelchair.

  In the conventional technology, a boarding table on which a wheelchair is mounted is provided on the support frame so as to be able to move up and down. There is an elevator for a wheelchair that is configured such that the boarding platform can be raised and lowered over the portion, and the level difference can be raised and lowered. In addition, when the contact of the first limit switch provided on the support frame enters the wheelchair elevator, the lift of the boarding stop is stopped, and the contact of the second or third limit switch provided on the boarding base is stopped. A drive control system is provided for stopping the descending of the boarding board when an obstacle comes into contact with the sensor member.

According to this technique, when the first limit switch breaks down, there is a possibility that the guide roller provided in the elevating frame is detached from the guide frame of the support frame. In addition, if the second and third limit switches fail, the boarding platform and the support frame come into contact with each other, and the members that move up and down the wheelchair elevator cannot be moved up and down mechanically. There is a risk of damaging components other than the second and third limit switches.
JP 2000-118971 A

  In view of the above circumstances, the present invention detects the position of the elevating member, and even if the position detecting means for determining the elevating range of the elevating member fails, the elevating member of the wheelchair elevator cannot mechanically elevate. It is an object of the present invention to provide a safety device for a wheelchair elevator that can prevent this.

According to the first aspect of the present invention, there is provided at least a base frame disposed on the installation surface, a support column standing on the base frame, a lifting member that moves up and down along the support column, and a wheelchair attached to the lifting member. A table section that can be boarded and passed, elevating means that elevates the elevating member up and down along the column, and a position detecting means that detects the position of the elevating member and determines the elevating range of the elevating member. The wheelchair elevator includes a lifting / lowering operation of the lifting / lowering member that is stopped when a foreign object is detected, and also serves as an auxiliary device when the position detecting unit is out of order.
According to the second aspect of the present invention, when the foreign object comes into contact with the contact plate, the limit switch is activated to stop the raising or lowering operation of the elevating member, and the elevating operation of the elevating member of the wheelchair elevator is mechanically locked. Before, the contact plate is configured to operate regardless of the presence of foreign matter.
The invention according to claim 3 is characterized in that the safety device according to claim 1 and claim 2 is disposed between a member that moves up and down of a lift for a wheelchair and a member that does not move up and down.

According to the first aspect of the present invention, the safety device is configured to stop the ascending or descending operation of the elevating member when a foreign object is detected, and also to act as an auxiliary device when the position detecting means fails. That is, the safety device is related to the presence of a foreign object while the position detecting means fails and the table part is raised or lowered from the upper limit position or the lower limit position to a position where the lifting / lowering member of the wheelchair lift cannot be lifted mechanically. So that the table portion is lifted or lowered. The upper limit position and the lower limit position are positions on the upper side and the lower side where the table unit and the like are stopped by the operation of the position detection unit provided in the lifting / lowering unit. According to this, even if the position detecting means breaks down, it is possible to prevent the safety member from moving up and down the wheelchair lift mechanically, and other members of the wheelchair lift can be damaged or broken. This can be prevented. Further, when the foreign matter hinders the raising or lowering operation of the table portion, the raising or lowering operation of the table portion can be stopped by the safety device, and the wheelchair elevator can be prevented from being damaged. Further, since the safety device also functions as an auxiliary device in the event of failure of the position detection means, it is not necessary to separately provide an auxiliary device in the event of failure of the position detection means, and the elevator for a wheelchair can be configured at low cost. it can.
According to the second aspect of the present invention, the limit switch is actuated when the foreign matter comes into contact with the contact plate, and the ascending or descending operation of the elevating member is stopped. At the same time, the contact plate is operated regardless of the presence of foreign matter before the lifting / lowering operation of the member for lifting / lowering the wheelchair lift is mechanically locked. According to this, the foreign object can be detected by the foreign object coming into contact with the contact plate, and when the foreign object is detected, the raising or lowering operation of the table portion can be stopped. Further, even if the position detecting means breaks down, this safety device operates regardless of the presence of foreign matter, so that it is possible to prevent the members that move up and down in the wheelchair elevator from being lifted and lowered mechanically.
Further, according to the invention of claim 3, the safety device is arranged between a member that moves up and down of a lift for a wheelchair and a member that does not move up and down. According to this, for example, a foreign object can be prevented from being crushed between the table portion and the base frame or the installation surface, the connecting member connecting the support column and the table portion or the lifting member, and the wheelchair elevator can be prevented from being damaged. can do.

  When the foreign object comes into contact with the contact plate, the limit switch is activated, and a connecting device that connects the columns is provided with a safety device that stops the lifting operation of the lifting member that moves up and down along the columns by the lifting unit. The safety device detects the position of the elevating member and acts as an auxiliary device in the event of failure of the position detecting means that determines the elevating range of the elevating member. Further, when the foreign object comes into contact with the contact plate, the limit switch is activated, and a safety device for stopping the descending operation of the elevating member is provided on the table portion attached to the elevating member. And this safety device is made to act as an auxiliary device at the time of failure of the position detecting means. That is, the safety device is in the presence of a foreign object while the position detecting means fails and the table portion is raised or lowered from the upper limit position or the lower limit position to a position where the member for raising and lowering the wheelchair elevator cannot be raised and lowered mechanically. Regardless of the operation, the ascending or descending operation of the table portion is stopped.

  According to this, even if the position detecting means breaks down, it is possible to prevent the safety member from moving up and down the wheelchair elevator, so that other members of the wheelchair elevator can be damaged or broken. Can be prevented. Further, it is possible to prevent crushing of foreign matter between the table portion and the base frame or the installation surface, and between the connecting member and the table portion or the lifting member, and it is possible to prevent the elevator for the wheelchair from being damaged. Further, since the safety device also functions as an auxiliary device in the event of failure of the position detection means, it is not necessary to separately provide an auxiliary device in the event of failure of the position detection means, and the elevator for a wheelchair can be configured at low cost. it can.

  An embodiment of a wheelchair elevator equipped with a safety device according to the present invention will be described with reference to the drawings. FIG. 1 is an overall front view showing a lift for a wheelchair. FIG. 2 is a sectional side view of the whole. FIG. 3 is an explanatory view showing the operation of the wheelchair elevator. FIG. 4 is an explanatory view showing the structure of the safety device on the table side. FIG. 5 is a side sectional view showing the safety device. FIG. 6 is a partial sectional view showing the safety device. FIG. 7 is an explanatory view showing the configuration of the safety device on the connecting member side. FIG. 8 is a sectional view showing the safety device. FIG. 9 is an explanatory view showing the operation of the safety device on the table side. FIG. 10 is an explanatory view showing the operation of the safety device on the connecting member side.

  The wheelchair elevator 1 is attached to a base frame 2, support columns 3 and 3 erected on the base frame 2, a lifting member 4 that moves up and down along the support columns 3 and 3, and the lifting member 4. The table portion 5 on which the wheelchair W can be mounted and passed, and the elevating means 6 for elevating the elevating member 4 up and down along the support columns 3 and 3 are mainly configured. The wheelchair elevator 1 includes a safety device 7 that prevents crushing of foreign matter between the lower surface of the table portion 5 and the base frame 2 or the installation surface G of the wheelchair elevator 1, and the support columns 3, 3. A safety device 9 is provided to prevent crushing of foreign matter between the connecting member 8 and the elevating / lowering member 4 or the table portion 5 that connect them.

Next, each part will be described.
The base frame 2 is formed in a substantially rectangular shape in plan view by fixing side frames 2a, 2a spaced apart from each other by a connecting frame 2b, 2b connecting the side frames 2a, 2a. Is. Moreover, the support | pillars 3 and 3 are each fixed by the both ends of the one side part of the base frame 2 in the upright state.

Next, the elevating member 4 attached so as to be movable up and down along the support columns 3 and 3 will be described.
The elevating member 4 has cylindrical members 4a and 4a that can be externally fitted to the support columns 3 and 3. The cylindrical members 4a and 4a are in contact with the support columns 3 and 3 and can freely roll. The rollers 4b, 4b,... Are supported so that the cylindrical members 4a, 4a move up and down smoothly. Instead of the rollers 4b, 4b,..., The lining (not shown) is arranged on the contact surfaces of the cylindrical members 4a, 4a with the support columns 3, 3, so that the cylindrical members 4a, 4a There is no problem even if it moves up and down smoothly. Further, connecting pipes 4c and 4c are fixed between the cylindrical members 4a and 4a, and reinforcing pipes 4d, 4d and 4d are fixed between the connecting pipes 4c and 4c, so that the cylindrical members 4a and 4a are connected to the cylindrical members 4a and 4a. The connecting pipes 4c, 4c and the reinforcing pipes 4d, 4d, 4d are integrated. Note that attachment members 4e and 4e for fixing a table portion 5 to be described later are fixed to appropriate positions of the reinforcing pipes 4d and 4d.

  Cylindrical members 4 a and 4 a are inserted into the support columns 3 and 3 so that the elevating member 4 configured as described above can move up and down along the support columns 3 and 3. The connecting member 8 is attached to the upper ends of the columns 3 and 3. The intermediate portion of the connecting member 8 is provided with a bearing portion 8a that serves as a mounting portion for the lifting means 6 described later.

Next, the raising / lowering means 6 which raises / lowers the said raising / lowering member 4 is demonstrated.
The elevating means 6 is a screw shaft 10 disposed so as to stand between the support columns 3 and 3 and a screw shaft that is screwed to the screw shaft 10 and can be moved up and down by forward and reverse rotation of the screw shaft 10. It is mainly comprised from the combined member 11 and the drive part 12 which rotationally drives the screw shaft 10. As shown in FIG. More specifically, the drive unit 12 is disposed between the support columns 3 and 3 of the base frame 2. The drive unit 12 includes a support member 13. A lower portion of the support member 13 is fixed to the support columns 3 and 3 or the base frame 2, and a bearing portion 14 for rotatably supporting the lower end of the screw shaft 10 is provided at the upper portion. The screw shaft 10 is attached to the bearing portion 14 and the bearing portion 8a of the connecting member 8 so as to be able to rotate forward and backward. The screw member 10 is screwed onto the screw shaft 10. Further, the motor 15 is arranged so that the screw shaft 10 and the axis of rotation of the motor 15 coincide with each other, and are connected via a coupling 16. Note that gears (not shown) or the like may be fastened to the rotating shaft of the motor 15 and the screw shaft 10, and these gears (not shown) may be arranged to mesh with each other. Reference numeral 17 denotes a control device for the motor 15, and reference numeral 18 denotes a cover for the drive unit 12. Reference numeral 19 denotes a cover for the screw shaft 10 and the screwing member 11.
Further, a mounting member 11a is fixed to the screwing member 11, and the mounting member 11a is screwed to a mounting plate 4f fixed to the reinforcing pipe 4d of the elevating member 4 so that the screwing member 11 is fixed. The elevating member 4 is configured to move up and down along the columns 3 and 3 in conjunction with the vertical movement. Further, an upper limit switch 20 and a lower limit switch 21 are attached to the attachment member 11a, and pressing members 22 and 23 for operating the limit switches 20 and 21 are attached to the upper and lower portions of the cover 19. ing.

  The mounting positions of the pressing members 22 and 23 are determined from the following viewpoints. The upper-side pressing member 22 is configured so that when the elevating member 4 is raised, the elevating member 4 and the connecting member 8, the screwing member 11 or the attachment member 11a and the bearing portion 8a are brought into contact with the upper limit switch. 20 is installed at a position where it can be operated. Further, the lower pressing member 23, when the elevating member 4 is lowered, elevates the elevating member 4 and the base frame 2, the table unit 5 and the base frame 2 and the installation surface G, the screwing member 11 or the attachment described later. Before the member 11a and the bearing portion 14 come into contact with each other, the lower limit switch 21 is attached at a position where it can be operated. That is, before the elevating member 4 cannot be raised or lowered at a place other than an electrical factor by contacting the elevating member constituting the wheelchair elevator 1 and the non-elevating member or contacting the elevating member and the installation surface G. The pressing members 22 and 23 are attached at positions where the upper limit or lower limit switch 20 or 21 can be operated. Note that a state in which a member that moves up and down in the wheelchair elevator 1 such as the lifting member 4 cannot mechanically move up and down is referred to as a mechanical lock state regardless of electrical factors. Moreover, when using the elevator 1 for wheelchairs, the press members 22 and 23 are attached according to the position which stops the raising / lowering member 4 normally, based on the above-mentioned viewpoint. That is, the upper side pressing member 22 raises the elevating member 4, and when the elevating member 4 reaches the normal stop position, the lower side pressing member 23 moves the elevating member 4 so that the upper limit switch 20 is activated. When the elevating member 4 reaches the normal stop position, the lower limit switch 21 is mounted so that the lower limit switch 21 is operated. The position detection of the elevating member 4 is detected by the pressing members 22 and 23 and the upper and lower limit switches 20 and 21. Means 24 are configured.

In the lifting and lowering means 6 configured in this manner, when the motor 15 is operated by the control device 17, the screw shaft 10 rotates, and the screwing member 11 screwed to the screw shaft 10 moves up or down. Is configured to move. And the raising / lowering member 4 shall raise / lower along the support | pillars 3 and 3 with the movement of the screwing member 11. FIG.
The elevating means 6 of the present embodiment is configured by using the fact that the screwing member 11 moves up and down by the rotation of the screw shaft 10, but is not shown in the drawing, but an extendable actuator or the like is used. You may do it. Further, a motor and a wire may be used. That is, there is no problem as long as the lifting / lowering means 4 can move the lifting / lowering member 4 up and down.

Further, the controller 17 of the elevating means 6 raises the elevating member 4 when the elevating member 4 is raised and the upper limit switch 20 of the position detecting means 24 comes into contact with the pressing member 22 to operate the upper limit switch 20. Is stopped, and an instruction to perform the ascending operation is not accepted. That is, in a state where the upper limit switch 20 of the position detection unit 24 is operating, only the lowering operation of the elevating member 4 can be performed. Further, the controller 17 of the lifting / lowering means 6 lowers the lifting / lowering member 4 when the lifting / lowering member 4 is lowered and the lower limit switch 21 of the position detecting means 24 comes into contact with the pressing member 23 to operate the lower limit switch 21. Is stopped, and the instruction to perform the lowering operation is not accepted. That is, in a state where the lower limit switch 21 of the position detecting unit 24 is in operation, only the lifting operation of the lifting member 4 can be performed. Note that the stop position of the elevating member 4 or the like when the upper limit switch 20 of the position detecting unit 24 is operating is the upper limit position, and the elevating member when the lower limit switch 21 of the position detecting unit 24 is operating. A stop position such as 4 is referred to as a lower limit position.
Accordingly, when the position detecting means 24 detects that the elevating / lowering member 4 is located at the upper limit position or the lower limit position, the elevating / lowering means 6 causes the control device 17 to stop the raising / lowering operation of the elevating / lowering member 4. Is also configured. In addition, the position detection means 24 is configured so that an elevating range of the elevating member 4 is determined, and the upper limit or lower limit switches 20 and 21 are operated before the mechanical lock state is generated in the wheelchair elevator 1. The elevating means 6 is also configured to prevent the mechanical lock state from being generated in the wheelchair elevator 1 by the position detecting means 24 and the control device 17.

The position detecting means 24 of the present embodiment is provided in the elevating means 6. However, if the position detecting means 24 is configured between a member that moves up and down in the wheelchair elevator 1 and a member that does not move up and down, the position detection described above. It is possible to configure position detecting means that exhibits the same operations and effects as the means 24.
Further, the position detection means 24 of the present embodiment is configured to detect the position of the elevating member 4 by the pressing members 22 and 23 and the upper and lower limit switch 20 and 21. good. For example, the position of the elevating member 4 may be detected using a displacement sensor such as an optical type, a magnetic type, an ultrasonic type, a contact type, or a capacitance type, a length measurement sensor, a proximity sensor, or an encoder. It is possible to constitute a position detecting means that exhibits the same operation and effect as the position detecting means 24 of FIG.

Further, the table 5 is positioned on the base frame 2 so as to be positioned on the elevating member 4, and fixing members 4 e and 4 e provided on the reinforcing pipes 4 d and 4 d of the elevating member 4 are screwed to the table 5. These are fixed so as to be integrated with the elevating member 4. The table portion 5 is formed by fixing a table plate 26 on a table frame 25, and is at least a size on which a wheelchair W can be boarded. In addition, fence members 27 and 27 are fixed to both sides of the table portion 5, and safety nets (not shown) are attached to the inside of the fence members 27 and 27 to prevent the user from falling down and ascending and descending. The user is prevented from entering the member 4 side. In addition, instead of the safety net (not shown), a plate-like member (not shown) may be attached inside the fence members 27, 27, or a plurality of stay members (not shown) may be fixed. The effects and effects can be obtained.
Further, slopes 28 and 28 are pivotally attached to both end portions of the table portion 5 so as to be rotatable up and down. In the drawing, the operation means of the slopes 28 and 28 are omitted, but at the lower limit position, one slope 28 can be rotated downward to get on and off (see FIG. 3 (a)). Thus, while the table portion 5 is moving up and down, the two slopes 28 and 28 are held in a state of being raised (see FIG. 3B) and function as a vehicle stop for the wheelchair W. When the height reaches a desired height, the other slope 28 is in a state in which the other slope 28 can be rotated downward (see FIG. 3 (c)) and can be lowered from the table portion 5. .

  In the wheelchair elevator 1 configured as described above, the screw shaft 10 is also rotated in the forward and reverse directions by the forward and reverse rotation of the motor 15 provided in the drive unit 12 of the lifting means 6. Thus, the screwing member 11 is moved either up or down, and the elevating member 4 and the table portion 5 attached to the screwing member 11 are moved up or down along the columns 3 and 3. is there.

Next, the safety device 7 that is provided in the table portion 5 of the wheelchair elevator 1 and prevents crushing of foreign matter between the lower surface of the table portion 5, the base frame 2, and the installation surface G will be described.
The safety device 7 has a contact plate 29, 30, 31, 32, 33 that is divided into a plurality of contact surfaces with foreign matter, and that the foreign matter has contacted the contact plates 29, 30, 31, 32, 33. It is mainly composed of a plurality of limit switches 34, 34,... For detection. More specifically, the cross beams 25a and 25a fixed to the front and rear end portions of the table frame 25 of the table portion 5, and the reinforcing members 25b and 25b fixed to the inner side of the cross beams 25a and 25a, respectively, Limit switches 34, 34,... Are respectively attached. And the contact plates 29, 30 bent in a substantially U shape in a side view are elongated holes 29a, 29a,..., 30a, 30a,. The stay member fixed between the reinforcing members 25b and 25b of the table frame 25 so as to cover the lower surfaces of the reinforcing members 25b and 25b and the limit switches 34 and 34 attached to the reinforcing members 25b and 25b. 25c and the reinforcing members 25b and 25b are suspended from mounting shafts 35, 35,. Further, contact plates 31 and 32 bent along the side surfaces and the lower surface of the cross beams 25a and 25a so as not to come into contact with the base frame 2 at the lower limit position are formed at appropriate positions of the contact plates 31 and 32, respectively. .., 32a, 32a,... Are attached to the mounting shafts 35, 35, so as to cover the lower surfaces of the limit switches 34, 34 attached to the cross beams 25a, 25a. Are suspended by screws 36, 36,... Fastened to the cross beams 25a, 25a. Further, the main beam 25d fixed to one side of the cross beams 25a, 25a and the L-shaped member 25e substantially L-shaped in front view fixed to the lower surface thereof, and at the lower limit position, A contact plate 33 bent so as not to come into contact with the base frame 2 is provided with limit switches 34, 34 attached to the cross beams 25a, 25a by using the long holes 33a, 33a, 33a formed in the contact plate 33. It is suspended by screws 37, 37, 37 fixed to the main beam 25d and the L-shaped member 25e so as to cover the lower surface.
The lower surfaces of the contact plates 29, 30, 31, and 32 are formed so as to form substantially the same plane.

In the safety device 7 configured as described above, the contact plates 29, 30, 31, 32, 33 are long on the mounting shafts 35, 35,... Or the screws 36, 36,. 30a, 30a, ..., 31a, 31a, ..., 32a, 32a, ..., 33a, 33a, 33a. , 30, 31, 32, 33 can be moved up and down. That is, when a foreign object comes into contact with any of the contact plates 29, 30, 31, 32, 33 and pushes up the contact plates 29, 30, 31, 32, 33, the contact plates 29, 30, 31, 32, 33 The limit switches 34, 34,... Corresponding to are operated. When at least one limit switch 34 corresponding to the contact plate 29, 30, 31, 32, 33 is activated, the lowering operation of the table unit 5 is stopped and the instruction to perform the lowering operation is not received. Has been. Even when the safety device 7 is in operation, the table section 5 can be lifted. When the contact between the contact plates 29, 30, 31, 32, 33 and the foreign matter is released and the limit switches 34, 34,... Are restored, the table unit 5 returns to a state where it can be raised and lowered. . That is, when the safety device 7 detects a foreign object in the lower portion of the table unit 5, the control device 17 of the elevating means 6 stops the lowering operation of the table unit 5 and does not accept an instruction for further lowering operation. It is configured to
Therefore, it is possible to prevent the foreign matter from being crushed by the table portion 5 and to prevent the wheelchair elevator 1 from being damaged. Further, the safety device 7 is configured to cover substantially the entire lower surface of the table portion 5 by the contact plates 29, 30, 31, 32, 33 divided into a plurality of parts. The safety device 7 can be operated even if it contacts. Further, the safety device 7 uses the contact plates 29, 30, 31, 32, 33 divided into a plurality of parts, so that the foreign matter contact surface of each contact plate 29, 30, 31, 32, 33 and each contact plate 29, The distance from the limit switches 34, 34,... Corresponding to 30, 31, 32, 33 can be reduced, and no matter which part of the contact plates 29, 30, 31, 32, 33 contacts , Foreign substances can be detected with good response.

In this embodiment, a plurality of contact plates 29, 30, 31, 32, 33 are used to cover substantially the entire lower surface of the table portion 5, but the contact plates 29, 30, 31, You may make it use the contact plate which comprised 32,33 integrally. Even if it does in this way, while being able to comprise the safety device which shows the effect | action and effect similar to the above-mentioned safety device 7, the number of limit switches used for a safety device can also be reduced.
Although not shown, a safety device that stops the lowering operation of the table unit 5 when a foreign object comes into contact with the contact plates 29, 30, 31, 32, 33 as in the safety device 7 is provided in the base frame 2. Even if it arrange | positions, the effect | action and effect similar to the above-mentioned are acquired.
Further, the contact plates 29, 30, 31, 32, 33 in the safety device 7 of the present embodiment are for detecting foreign substances over a wide range with the fewest limit switches 34, 34,. . Therefore, if it is possible to detect foreign matter by using a lot of limit switches even if a foreign matter comes into contact with any part of the lower surface of the table portion 5, the above-described operation can be performed without using the contact plates 29, 30, 31, 32, 33. A safety device capable of obtaining the same operation and effect as the safety device 7 can be configured.

  The safety device 7 is also configured as follows. As shown in FIG. 9, at the lower limit position, the distance between the elevating member 4 and the base frame 2 is closest to the elevating member and the non-elevating member of the wheelchair elevator 1. The distance between these members is distance A (distance A> 0). In the lower limit position, the distance between the contact plate 29, 30, 31, 32 and the installation surface G when pushed up to operate the limit switches 34, 34,. Distance B> 0). Furthermore, the distance between the contact plate 33 and the base frame 2 when pushed up to operate the limit switches 34, 34 of the safety device 7 is a distance C (distance C> 0). The distances A, B, and C are configured such that the values of the distances B and C are smaller than the distance A, that is, the relationship of distance A> distance B and distance A> distance C is established. ing.

By configuring the safety device 7 in this way, even if the lower limit switch 21 of the position detecting unit 24 breaks down and the table unit 5 is lowered from the lower limit position, the mechanical lock state is generated. Further, any one of the contact plates 29, 30, 31, 32, 33 of the safety device 7 is pushed up by the base frame 2 or the installation surface G, and the limit switch corresponding to the contact plates 29, 30, 31, 32, 33 is pushed. 34, 34,... Operate. When at least one limit switch 34 corresponding to the contact plates 29, 30, 31, 32, 33 is activated, the controller 17 of the lifting / lowering means 6 stops the lowering operation of the table unit 5. That is, the safety device 7 can be used as an auxiliary device when the lower limit switch 21 of the position detecting means 24 fails.
Therefore, even if the lower limit switch 21 of the position detecting means 24 breaks down, the safety device 7 can prevent the wheelchair lift 1 from reaching the mechanical lock state, and other members of the wheelchair lift 1 can be damaged or broken. Can be prevented. Further, since the safety device 7 is also configured to function as an auxiliary device when the lower limit switch 21 of the position detection unit 24 fails, it is necessary to provide a separate auxiliary device when the lower limit switch 21 of the position detection unit 24 fails. Therefore, the wheelchair elevator 1 can be configured at low cost.

  In addition, in the elevator 1 for wheelchairs in the present embodiment, when the lower limit switch 21 of the position detection unit 24 breaks down, the mechanical lock state is most easily caused between the lifting member 4 and the base frame 2. Therefore, the relationship between the distances B and C with respect to the distance A is illustrated as described above. However, depending on the configuration of the wheelchair elevator, the part closest to the distance between the member that moves up and down at the lower limit position and the member that does not move up and down may be between other members. Thus, the distances B and C may be configured to be small. The safety device may be operated regardless of the presence of foreign matter while the table part descends from the lower limit position to the position where the mechanical lock state occurs in the wheelchair elevator when the clogging place and position detection means break down. . If it does in this way, the safety device which can acquire the above operation and effect can be constituted.

Next, the safety device 9 that is provided in the connecting member 8 and prevents crushing of foreign matter between the connecting member 8 and the elevating member 4 or the table portion 5 will be described.
The safety device 9 mainly includes a contact plate 38 that serves as a contact surface with foreign matter, and limit switches 39 and 39 for detecting that the foreign matter has come into contact with the contact plate 38. More specifically, the limit switches 39 and 39 are respectively disposed on the side surfaces of the connecting member 8, and the locking members 40 and 40 are fixed. The contact plate 38 bent in a substantially L shape when viewed from the front is disposed so that one side thereof is hooked on the locking members 40, 40, and the other side is connected to the connecting member. 8 is fixed to the lower surface with screws 41, 41, and is disposed so as to cover the side and lower surfaces of the limit switches 39, 39 and the connecting member 8.

The safety device 9 configured in this manner is in a state where one side of the contact plate 38 is hooked on the locking members 40, 40, and the contact plate 38 can swing substantially vertically. ing. That is, the limit switches 39 and 39 are configured to operate when a foreign object comes into contact with the contact plate 38 and pushes up the contact plate 38. When at least one limit switch 39 is actuated, the ascending operation of the table unit 5 is stopped, and the instruction to perform the ascending operation is not accepted. Even when the safety device 9 is in operation, the table portion 5 can be lowered. When the contact between the contact plate 38 and the foreign matter is released and the limit switches 39 and 39 are restored, the table portion 5 returns to a state where it can be raised and lowered. That is, when the safety device 9 detects a foreign object in the lower portion of the connecting member 8, the safety device 9 stops the raising operation of the table unit 5 to the control device 17 of the elevating means 6 and does not accept an instruction to further raise the table portion 5. It is configured to
Accordingly, it is possible to prevent the foreign matter from being crushed between the connecting member 8 and the fence members 27 and 27 provided on the lifting member 4 or the table portion 5 and to prevent the wheelchair elevator 1 from being damaged. Can be prevented.

Although not shown in the drawing, a safety device that stops the ascending operation of the table unit 5 when a foreign object comes into contact with the contact plate 38 as in the safety device 9 is provided in the table unit 5 or the lifting member 4. Also, the same operation and effect as described above can be obtained.
In addition, the contact plate 38 in the safety device 9 of the present embodiment is for detecting foreign matter over a wide range with limit switches 39, 39 that are as few as possible. Therefore, if it is possible to detect a foreign object even if a foreign object contacts any part of the lower surface of the connecting member 8 using a number of limit switches, the same operation as that of the safety device 9 described above can be performed without using the contact plate 38. And a safety device capable of obtaining the effect.

  The safety device 9 is also configured as follows. As shown in FIG. 10, in the upper limit position, the distance between the lifting member 4 and the connecting member 8 is closest to the lifting member 4 and the non-lifting member of the wheelchair elevator 1. The distance between the members is a distance D (distance D> 0). Further, a pressing element 42 bent in a substantially bowl shape is screwed to the elevating member 4 and is pushed up to operate the upper end of the pressing element 42 at the upper limit position and the limit switches 39, 39 of the safety device 9. The distance between the contact plate 38 and the contact plate 38 is a distance E (distance E> 0). The distances D and E are set so that the value of the distance E becomes smaller than the distance D, that is, the relationship of distance D> distance E is satisfied.

By configuring the safety device 9 in this way, even if the upper limit switch 20 of the position detecting unit 24 breaks down and the table unit 5 rises above the upper limit position, the mechanical lock state occurs before the occurrence of the mechanical lock state. Further, the contact plate 38 of the safety device 9 is pushed up by the pressing element 42, and the limit switches 39 and 39 are operated. When at least one limit switch 39 is actuated, the controller 17 of the elevating means 6 stops the ascending operation of the table unit 5. In other words, the safety device 9 can be used as an auxiliary device when the upper limit switch 20 of the position detecting means 24 fails.
Therefore, even if the upper limit switch 20 of the position detecting means 24 breaks down, the safety device 9 can prevent the wheelchair lift 1 from reaching the mechanical lock state, and other members of the wheelchair lift 1 can be damaged or break down. Can be prevented. In addition, since the safety device 9 is also configured to function as an auxiliary device when the upper limit switch 20 of the position detecting unit 24 fails, it is necessary to separately provide an auxiliary device when the upper limit switch 20 of the position detecting unit 24 fails. Therefore, the wheelchair elevator 1 can be configured at low cost.

  In addition, in the elevator 1 for wheelchairs in the present embodiment, when the upper limit switch 20 of the position detection unit 24 breaks down, the mechanical lock state is most easily caused between the lifting member 4 and the connecting member 8. Therefore, the relationship of the distance E to the distance D is illustrated as described above. However, depending on how the elevator for the wheelchair is configured, the part closest to the distance between the member that moves up and down at the upper limit position and the member that does not move up and down may be between other members. Thus, the distance D may be configured to be small. If the table is raised from the upper limit position to the position where the mechanical lock state occurs in the wheelchair elevator when the clogging location or position detection means breaks down, the safety device should be operated regardless of the presence of foreign matter. good. If it does in this way, the safety device which can acquire the above operation and effect can be constituted.

  Further, the safety devices 7 and 9 of the present embodiment can detect a foreign object using the contact plates 29, 30, 31, 32, 33, 38 and the limit switches 34, 34,. Although it is configured to stop the ascending or descending operation of the part 5 and the like, it can also be as follows. For example, a safety device that stops the ascending or descending operation of the table unit 5 or the like when a foreign object is detected using a touch sensor such as a resistive film type, a capacitance type, an ultrasonic type, or an optical type may be configured. Further, a safety device that stops the ascending or descending operation of the table unit 5 or the like when a foreign object is detected may be configured by using a tape-like switch that can insert a contact at any position when pressed. Further, instead of the limit switches 34, 34,..., 39, 39, a push button switch, a displacement sensor such as an optical type, a magnetic type, an ultrasonic type, a contact type, a capacitance type, a side length sensor, or a proximity sensor. You may comprise the safety device which stops the raise or descent | fall operation | movement of the table part 5, if a foreign material is detected using a sensor. Even if the safety device is configured as described above, the same operations and effects as the safety devices 7 and 9 described above can be obtained.

The whole front view which shows the elevator for wheelchairs. The whole sectional side view. Explanatory drawing which shows a mode that the elevator for wheelchairs operate | moves. (A) Explanatory drawing which shows a mode that the user got into the table part. (B) Explanatory drawing which shows a mode when a table part raises. (C) Explanatory drawing which shows a mode at the time of a user getting off from a table part after completion | finish of raising operation | movement. Explanatory drawing which shows the structure of the safety device by the side of a table part. The sectional side view which shows the safety device. The fragmentary sectional view which shows the safety device. Explanatory drawing which shows the structure of the safety device by the side of a connection member. Sectional drawing which shows the safety device. Explanatory drawing which shows a mode that the safety apparatus by the side of a table part act | operates. Explanatory drawing which shows a mode that the safety device by the side of a connection member act | operates.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheelchair elevator 2 Base frame 3 Support column 4 Lifting member 5 Table part 6 Lifting means 7 Safety device 9 Safety device 24 Position detection means 29 Contact plate 30 Contact plate 31 Contact plate 32 Contact plate 33 Contact plate 34 Limit switch 38 Contact plate 39 Limit Switch G Installation surface W Wheelchair

Claims (3)

  At least a base frame disposed on the installation surface, a support column standing on the base frame, an elevating member that moves up and down along the support column, and a wheelchair that is attached to the elevating member can be boarded and passed In a lift for a wheelchair comprising a table portion, a lifting means for moving the lifting member up and down along a support, and a position detecting means for detecting the position of the lifting member and determining a liftable range of the lifting member, A safety device for an elevator for a wheelchair characterized in that when a foreign object is detected, the ascending / descending operation of the elevating member is stopped and also acts as an auxiliary device when the position detecting means fails.   When a foreign object comes into contact with the contact plate, the limit switch is activated to stop the lifting or lowering operation of the lifting member, and before the lifting operation of the lifting member of the wheelchair lift is mechanically locked, The safety device for a lift for a wheelchair according to claim 1, wherein the contact plate is configured to operate irrespectively.   An elevator for a wheelchair characterized in that the safety device according to claim 1 or 2 is disposed between a member for raising and lowering a wheelchair elevator and a member for not raising or lowering.

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