JP2015040085A - Electrically-driven lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems for example, when a step is about 1.5 meters for example, in an electrically-driven lifting device called as a step resolution machine for facilitating movement of a person seating on a wheel chair on a step, a drive mechanism for lifting a ramp becomes large in a height direction, resulting in giving oppressive feeling to a person seating on the ramp, therefore the height of the lifting mechanism called as mast height is made compact, for preventing oppressive feeling given to a seating person while securing long lifting distance.SOLUTION: A first lifting mechanism 51 for lifting an intermediate frame 40 to a stationary frame 30 and a second lifting mechanism 52 for lifting a ramp 10 to the intermediate frame 40 are actuated simultaneously for lifting the ramp 10 to the stationary frame 30. Thereby, height of a lifting drive device 50 is suppressed for reducing oppressive feeling given to a seating person.

Description

  The present invention relates to an electric lifting device for eliminating a level difference that raises and lowers a wheelchair between a lower level side and an upper level side of a level difference using an electric motor as a drive source.

The following patent document discloses a technique related to a step-lift lifting device that is mounted on a lift platform together with a wheelchair on which a person is seated to lift up and down between steps. This type of lifting device includes a base, a fixed column extending upward from the side of the base, a lifting mechanism built in the fixed column, and a lifting platform supported so as to be movable up and down along the fixed column. With the configuration, by raising and lowering the lifting platform between the upper side and the lower side of the step, it is possible to easily move the wheelchair on which the person is sitting, the caregiver, etc. between the steps.
The raising / lowering mechanism uses a ball screw mechanism that normally uses an electric motor as a drive source, and a raising / lowering distance of about 1.5 meters is secured at the maximum.

JP 2008-81231 A JP 2005-219882 A

However, the conventional lifting device uses a ball screw mechanism or a chain transmission mechanism as a lifting mechanism. As a result, when a large lifting distance is to be secured, the height of the lifting mechanism (the so-called mast height) is obtained in order to obtain the stroke required for this. ) Will increase. As a result of the height of the fixed column portion accommodating the lifting mechanism, the feeling of pressure received by the seated person of the wheelchair riding on the lifting platform and the caregiver becomes stronger and difficult to use.
It is an object of the present invention to ensure a large lifting distance without securing a feeling of pressure while a wheelchair seated person or a caregiver thereof receives a feeling of pressure while securing an appropriate lifting distance.

Said subject is solved by each following invention.
A first aspect of the present invention is an electric lifting device for stepping elimination that lifts and lowers a wheelchair between a lower step side and an upper step side using an electric motor as a drive source, and a base frame for installation on the lower step side, a base A fixed frame standing upward from the frame, an intermediate frame supported to be movable up and down with respect to the fixed frame, a lifting platform supported to be movable up and down relative to the intermediate frame, and raising and lowering the intermediate frame relative to the fixed frame The first elevating mechanism and the second elevating mechanism for elevating the elevating platform with respect to the intermediate frame are provided, and the intermediate frame is raised with respect to the fixed frame by simultaneously operating the first and second elevating mechanisms. The lift is raised with respect to the intermediate frame, and the lift is lowered with respect to the intermediate frame while the intermediate frame is lowered with respect to the fixed frame. It is a flow apparatus.
According to the first invention, when the first and second lifting mechanisms are operated simultaneously in the lifting platform, the intermediate frame moves up and down with respect to the fixed frame, and the lifting platform moves up and down with respect to the intermediate frame. The lifting platform and thus the wheelchair can be raised and lowered by the total distance. While raising and lowering the total distance by the first elevating mechanism and the second elevating mechanism, the height of the fixed frame can be largely reduced to reduce the so-called mast height. Thereby, the feeling of pressure given to the seated person of the wheelchair who boarded the lift, the caregiver, etc. can be reduced or almost eliminated.
A second invention is an electric lifting apparatus according to the first invention, wherein the first lifting mechanism and the second lifting mechanism operate using a common electric motor as a drive source.
According to the second invention, the first and second elevating mechanisms can be operated simultaneously with a simpler configuration than the configuration in which the individual electric motors are used as the drive sources for the first and second elevating mechanisms. And maintainability can be improved.
According to a third invention, in the first or second invention, a screw shaft mechanism as a first lifting mechanism is interposed between the fixed frame and the intermediate frame, and the intermediate frame is interposed between the fixed frame and the lifting platform. It is an electric lifting apparatus in which a moving pulley mechanism as a second lifting mechanism is interposed via a moving pulley provided in the vehicle.
According to the third aspect of the present invention, since the moving pulley mechanism moves the lifting frame relative to the intermediate frame at the same time as the lifting movement of the intermediate frame relative to the fixed frame, the lifting table moves up and down at a double speed relative to the fixed frame. Can be made.
According to a fourth invention, in the third invention, the screw shaft of the screw shaft mechanism is supported on the intermediate frame side, the nut of the screw shaft mechanism is supported on the fixed frame side, and the screw shaft is rotated around its axis by the electric motor. The intermediate frame is configured to move up and down relative to the fixed frame by rotating, and the nut is supported on the base frame via a screw shaft support through which the screw shaft can be inserted. The screw shaft support is attached to the intermediate frame. It is an electric lifting apparatus configured to be held by a holding member and to function as the bearing.
According to the fourth aspect of the invention, the total weight of the intermediate frame, the lifting platform and the seated person of the wheelchair riding on the lifting platform is added to the screw shaft support as an axial force (buckling load). The screw shaft support is held on the intermediate frame side by a holding member. Accordingly, the uprightness of the screw shaft support is maintained, the addition of a bending moment can be suppressed, and the strength against buckling can be increased, thereby reducing the diameter of the screw shaft support and the screw shaft. .

It is a front view of the electric lifting apparatus which concerns on embodiment of this invention. This figure has shown the state which the raising / lowering stand raised to the raise end position. It is a left view of the electric lifting apparatus which concerns on this embodiment. This figure has shown the state which the raising / lowering stand raised to the raise end position. It is a front view of a raising / lowering drive device. This figure has shown the state which the raising / lowering stand raised to the raise end position. It is a left view of a raising / lowering drive device. This figure has shown the state which the raising / lowering stand raised to the raise end position. It is a front view of the 1st raising / lowering mechanism. It is a left view of a 1st raising / lowering mechanism. It is a cross-sectional view of an elevating drive device. In the figure, among the fixed frame, the intermediate frame, and the lifting frame, only the intermediate frame is shown in cross section.

Next, an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 1 and 2, the electric lifting device 1 of the present embodiment is mainly used as a level difference canceling device for lifting and lowering a wheelchair (not shown) between steps (lower stage D1 and upper stage D2). In the following description, the front side of the electric lifting device 1 shown in FIG. 1 is the front side, and the left-right direction is used as a reference when viewed from the front.
As shown in FIGS. 1 to 4, this electric lifting device 1 includes a lifting platform 10 on which a wheelchair is mounted, a base frame 20 for installation, a fixed frame 30 extending upward from the base frame 20, and a lifting platform 10. An elevating drive device 50 that moves up and down is provided.
The lifting platform 10 has a flat plate shape with an area capable of mounting at least one wheelchair, and moves up and down in parallel between the lower stage D1 and the upper stage D2. Handrail frames 13 and 14 are provided on both front and rear sides of the lifting platform 10, respectively. Gate bars 15 and 16 are respectively provided at the left boarding gate and the right boarding gate of the lifting platform 10. The left and right gate bars 15 and 16 can be opened and closed vertically by turning the open / close levers 15a and 16a up and down.
The base frame 20 is firmly installed by anchor bolts 21 to 21 on the lower stage D1 side. A fixed frame 30 is provided on the rear side of the base frame 20. The fixed frame 30 is provided so as to extend upward from the center in the left-right direction of the base frame 20. An intermediate frame 40 is supported along the fixed frame 30 so as to be movable up and down, and a lift driving device 50 is attached.

Details of the intermediate frame 40 and the lifting drive 50 are shown in FIGS. The intermediate frame 40 is a rectangular frame that is substantially the same height as the fixed frame 30, and as shown in FIGS. 5 to 7, one side rail that extends in the vertical direction is provided on each of the left and right side surfaces of the intermediate frame 40. 41 is provided. The left and right side rails 41, 41 are sandwiched from the front and rear between two pairs of guide rollers 31, 31 provided on the sides of the fixed frame 30, respectively. As shown in FIG. 6, the left and right side rails 41 and 41 are sandwiched between guide rollers 31 and 31 with appropriate spans in the vertical direction. The left and right side rails 41, 41 are guided by being sandwiched from the front and rear between the guide rollers 31, 31 with appropriate spans in the vertical direction, so that the intermediate frame 40 can be moved back and forth with respect to the fixed frame 30. It is supported to move up and down smoothly without rattling or tilting.
One rear rail 42 is provided in the center of the rear surface of the intermediate frame 40. The rear rail 42 is also guided in a state of being sandwiched from left and right between guide rollers 33 provided on the front surface of the fixed frame 30. As shown in FIG. 6, the rear rail 42 is also sandwiched between the guide rollers 33, 33 with an appropriate span in the vertical direction. The rear rail 42 is guided by being sandwiched from the left and right by a total of four guide rollers 33 to 33 arranged with appropriate spans in the vertical direction, so that the intermediate frame 40 moves in the horizontal direction with respect to the fixed frame 30. It is supported to move up and down smoothly without rattling or tilting.

The lifting platform 10 is supported on the front side of the intermediate frame 40 via the lifting platform frame 9. A front rail 43 is attached to the left side of the front surface of the intermediate frame 40 so as to extend vertically. The front rail 43 is sandwiched between the guide rollers 11 and 11 provided on the lifting frame 9 from the left and right. As shown in FIGS. 5 and 6, the front rail 43 is sandwiched between the guide rollers 11 and 11 at two places with appropriate spans in the vertical direction. The front rail 43 on the intermediate frame 40 side is guided by being sandwiched from the left and right by a total of four guide rollers 11 to 11, so that the lifting frame 9 and the lifting platform 10 rattle from side to side with respect to the intermediate frame 40. It is supported to move up and down smoothly without tilting.
Further, a pair of left and right inner rails 44, 44 are attached to the inside of the front surface of the intermediate frame 40 so as to face each other while extending vertically. The left and right inner rails 44 are sandwiched between the front and rear guide rollers 12 to 12 provided on the lifting platform frame 9 side. The inner rail 44 is sandwiched between the front and rear guide rollers 12 and 12 at the upper left and right and the lower left and right of the elevator frame 9. A total of eight guide rollers 12 to 12 support the lifting frame 9 and the lifting platform 10 so as to move up and down smoothly and in parallel in a state where there is mainly no backlash or tilt in the front-rear direction.

The elevating drive device 50 includes a first elevating mechanism 51 and a second elevating mechanism 52. The first elevating mechanism 51 is a ball screw mechanism and includes a screw shaft 53 and a nut 54. An electric motor 55 as a drive source for rotating the screw shaft 53 about its axis is installed on the upper portion of the intermediate frame 40. The electric motor 55 is a geared motor having a gear head 55a for reduction, and the upper end portion of the screw shaft 53 is coaxially coupled to the output shaft of the gear head 55a.
The nut 54 meshed with the screw shaft 53 is coupled to the upper end portion of the screw shaft support 56. The screw shaft support 56 is a long pipe material through which the screw shaft 53 can be inserted on the inner peripheral side, and the lower end portion thereof is coupled to the upper surface of the base frame 20. The screw shaft support 56 is fixed on the base frame 20 so as not to rotate around the shaft. The nut 54 attached to the upper end portion of the screw shaft support 56 is also fixed so as not to rotate about the axis of the screw shaft 53. The nut 54 and the screw shaft support 56 are fixed so as not to be displaced in the vertical direction in the axial direction. For this reason, when the screw shaft 53 rotates about its axis, the screw shaft 53 and thus the intermediate frame 40 move up and down with respect to the fixed frame 30 through meshing with the nut 54.
The screw shaft support 56 is held in an upright state by an annular holding member 57 attached to the intermediate frame 40. The holding member 57 is made of resin and functions as a sliding bearing. The screw shaft support 56 is inserted on the inner peripheral side of the holding member 57 so as to be relatively movable in the axial direction (vertical direction). Therefore, the holding member 57 integrally moves up and down along the screw shaft support 56 as the intermediate frame 40 moves up and down while holding the screw shaft support 56 on the inner peripheral side thereof.
From the above, the weight of the intermediate frame 40 and the lifting platform 10 and the total weight on the lifting platform 10 are received by the base frame 20 via the screw shaft support 56.
Further, since the uprightness of the screw shaft support 56 is maintained by the holding member 57, the total weight of the intermediate frame 40, the lifting platform 10, the wheelchair seated person, etc. passes through the screw shaft 53 as an axial load on the screw shaft support 56. Added. Thereby, the addition of a bending moment to the screw shaft support 56 can be avoided, and the durability against buckling load can be increased. Therefore, the diameters of the screw shaft support 56 and the screw shaft 53 can be reduced.

The second lifting mechanism 52 is a moving pulley mechanism and includes a moving pulley 58 and a roller chain 59. In the present embodiment, a configuration in which three sets of moving pulley mechanisms are arranged in parallel is provided. As shown in FIGS. 3 and 4, the three movable pulleys 58 to 58 are rotatably supported coaxially with each other via a support shaft provided on the upper portion of the intermediate frame 40. One end side 59 a of the roller chain 59 spanned around each of the three movable pulleys 58 to 58 is coupled to the upper portion of the fixed frame 30. The other end side 59 b of the roller chain 59 that is folded downward through the movable pulley 58 is coupled to the lift frame 9.
When the electric motor 55 is activated and the screw shaft 53 rotates around the shaft, the intermediate frame 40 moves up and down. As the intermediate frame 40 moves up and down, the three movable pulleys 58 to 58 are integrally displaced up and down. As the movable pulleys 58 to 58 are displaced up and down, the lifting platform 10 moves up and down with respect to the intermediate frame 40. Therefore, the lifting platform 10 moves up and down with respect to the fixed frame 30 at a speed (double speed) that is the sum of the lifting speed of the intermediate frame 40 relative to the fixed frame 30 and the lifting speed of the movable pulley relative to the intermediate frame 40. Therefore, the lifting distance of the lifting platform 10 is twice the lifting distance of the intermediate frame 40, so that the lifting distance of the intermediate frame 40 is ½ of the lifting distance of the lifting platform 10. For example, when 1.5 m is secured as the lifting distance of the lifting platform 10, the intermediate frame 40 only needs a lifting distance of 0.75 m, and the rising end height of the intermediate frame 40 is set to about half of the conventional height. be able to.
As shown in FIGS. 1 and 2, the elevating drive device 50 including the fixed frame 30 and the intermediate frame 40 is covered with a mast cover 5. The mast cover 5 is installed in a state extending upward from the upper surface of the rear part of the lifting platform 10. On the front surface of the mast cover 5, a remote controller 3 for mainly performing the lifting operation of the electric lifting device 1 is installed. When the seated person of the wheelchair 2 who has boarded the lifting platform 10 or the caregiver operates the remote controller 3, the lifting operation of the electric lifting device 1 can be performed.
A bellows type guard 4 that can be vertically expanded and contracted is mounted around the lifting platform 10 (four front, rear, left and right surfaces). The lower end of the guard 4 is coupled to the periphery of the base frame 20. By covering the fixed frame 30 and the lifting drive device 50 below the lifting platform 10 with the guard 4 at all times regardless of the lifting position of the lifting platform 10, these dustproof measures and waterproof measures are taken. Further, entry of foreign matter below the elevator 10 is prevented.

According to the electric lifting apparatus 1 of the present embodiment configured as described above, the lifting platform 10 is moved up and down in two stages by the first and second lifting mechanisms 51 and 52, so The first and second elevating mechanisms 51 and 52 can be configured compactly in the height direction while securing the distance. By making the first and second elevating mechanisms 51 and 52 compact in the height direction, the height of the mast cover 5 that covers them can be made lower than the so-called mast height. This can reduce or eliminate the feeling of pressure applied to the seated person or the caregiver on the lifting platform 10.
Further, the second elevating mechanism 52 that operates as a moving pulley mechanism causes the elevating speed of the elevating platform 10 relative to the fixed frame 30 to be the elevating speed of the intermediate frame 40 relative to the fixed frame 30 and the elevating speed of the elevating platform 10 relative to the intermediate frame 40. Therefore, the lifting platform 10 can be moved up and down at a so-called double speed.
Furthermore, the screw shaft support 56 supported on the base frame 20 is held in an upright state by the resin holding member 57 that moves up and down integrally with the intermediate frame 40 functions as a slide bearing. Further, since the screw shaft support 56 is held in an upright state by the holding member 57, the total weight of the intermediate frame 40, the lifting platform 10 and its occupant, etc. is applied to the screw shaft 53 and the screw shaft support 56. The bending moment applied to the screw shaft support 56 can be reduced or eliminated. Further, the screw shaft support 56 is held by the holding member 57 that functions as a sliding bearing, so that the buckling strength of the screw shaft support 56 can be increased, thereby reducing the diameters of the screw shaft 53 and the screw shaft support 56. Can be achieved.
Various modifications can be made to the embodiment described above. For example, a screw shaft mechanism may be used as both the first and second lifting mechanisms. In this case, in addition to using a common electric motor as a drive source for both screw shaft mechanisms, a configuration may be adopted in which individual electric motors are used as drive sources.
Further, instead of the holding member 57 that holds the screw shaft support 56, the screw shaft support 56 may be supported more firmly with respect to the fixed frame 30 or the base frame 20.

1 ... Electric lifting device
D1 ... Lower stage, D2 ... Upper stage 3 ... Remote control 4 ... Guard 5 ... Mast cover 9 ... Elevator base frame 10 ... Elevator base 11, 12 ... Guide roller 13 ... Handrail frame (front side)
14 ... handrail frame (rear side)
DESCRIPTION OF SYMBOLS 15 ... Gate bar (left side), 15a ... Opening / closing lever 16 ... Gate bar (right side), 16a ... Opening / closing lever 20 ... Base frame, 21 ... Anchor bolt 30 ... Fixed frame 31 ... Guide roller 33 ... Guide roller 40 ... Intermediate frame 41 ... Side surface Rail 42 ... Rear rail 43 ... Front rail 44 ... Inner rail 50 ... Elevating drive device 51 ... First elevating mechanism 52 ... Second elevating mechanism 53 ... Screw shaft 54 ... Nut 55 ... Electric motor 55a ... Gear head 56 ... Screw Shaft support 57 ... Holding member 58 ... Dynamic pulley 59 ... Roller chain, 59a ... One end side, 59b ... Other end side

Claims (4)

An electric lifting device for eliminating a level difference that raises and lowers a wheelchair between a lower level and an upper level by using an electric motor as a driving source, and a base frame for installation on the lower level, and upward from the base frame A stationary frame that stands up, an intermediate frame that is supported to be movable up and down relative to the fixed frame, an elevator that is supported to be movable up and down relative to the intermediate frame, and the intermediate frame that moves up and down relative to the fixed frame A first elevating mechanism and a second elevating mechanism for elevating the elevating platform with respect to the intermediate frame;
The first and second elevating mechanisms are simultaneously operated to raise the elevating base with respect to the intermediate frame while raising the intermediate frame with respect to the fixed frame, and the intermediate frame with respect to the fixed frame. An electric lifting device configured to lower the lifting platform with respect to the intermediate frame while lowering. The electric lifting apparatus according to claim 1, wherein the first lifting mechanism and the second lifting mechanism operate using a common electric motor as a drive source. The electric lifting device according to claim 1 or 2, wherein a screw shaft mechanism as a first lifting mechanism is interposed between the fixed frame and the intermediate frame, and between the fixed frame and the lifting platform. An electric lifting device in which a moving pulley mechanism as the second lifting mechanism is interposed via a moving pulley provided in the intermediate frame. 4. The lifting device according to claim 3, wherein a screw shaft of the screw shaft mechanism is supported on the intermediate frame side, a nut of the screw shaft mechanism is supported on the fixed frame side, and the screw shaft is supported by the electric motor. And the intermediate frame moves up and down with respect to the fixed frame, and the nut is supported on the base frame via a screw shaft support through which the screw shaft can be inserted. An electric lifting apparatus configured to hold the screw shaft support with a holding member attached to the intermediate frame and to function the holding member as a bearing.

Images