JP3014961B2 - lift device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lifting device for mounting and dismounting a wheelchair, a trolley or other cargo on a vehicle, and more particularly to a lifting device mounted on a rear portion of a van type car (box type vehicle). The present invention relates to an elevating device suitable for:

[0002]

2. Description of the Related Art Conventionally, as an elevating device of this type, there has been known an apparatus disclosed in Japanese Utility Model Publication No. 63-44272 proposed by the present applicant. This conventional device has a structure in which a platform is attached to a lower end portion of a side frame that is raised and lowered by a parallel link mechanism. By rotating the parallel link, the platform is moved to a landing position and a vehicle body floor surface of a van type car or the like. It can be moved up and down between the substantially coincident ascending positions.

[0003]

However, since the above-mentioned conventional device does not have a structure in which the platform is pulled into the vehicle interior while the wheelchair or the like is mounted, when the above-mentioned conventional device is used for getting on and off the wheelchair, the platform is a van type. When the height of the wheelchair is approximately the same as the floor of the body of the car, the user of the wheelchair must move the wheelchair from the platform outside the vehicle to the floor of the body or vice versa. The presence of a slight step or gap between the outer platform and the floor of the vehicle body may hinder smooth movement of the wheelchair. In addition, since it is necessary to operate a wheelchair on a platform at a raised position outside the vehicle, the user may feel uneasy about a wheelchair user.

[0004] A first object of the present invention is to solve the above problems,
In addition to raising and lowering the platform, it can be retracted into the body of a van type car etc., improving the operability of users such as wheelchairs and trolleys, realizing smooth use of wheelchairs and trolleys, and improving safety. An object of the present invention is to provide a lifting device that can be designed.

[0005] A second object of the present invention is to provide an elevating device which automates the operation of pulling the platform out of the vehicle body and retracting the platform into the vehicle body, thereby further improving the operability.

A third object of the present invention is to provide an elevating device capable of smoothing the elevating operation of a side frame to which a platform is attached and reducing shock at the ascending position of the side frame and the platform. is there.

[0007] Other objects and novel features of the present invention will be clarified in embodiments described later.

[0008]

In order to achieve the above-mentioned object, the present invention provides an elevating device comprising a pair of main frames fixed to the floor of a vehicle body, and a first frame having one end pivotally attached to each main frame. And a second arm, a side frame pivotally attached to the other end of each of the first and second arms, a platform slidably mounted in the front and rear direction with respect to the side frame, A double-acting hydraulic cylinder that rotates the second arm to drive the platform up and down, a belt-like or chain-like body having both ends fixed to the platform, and the side frames located on both sides of the platform. A drive motor attached to a connecting member, a drive wheel around which the belt-like or chain-like body is wound and driven to rotate by the drive motor, and two ports of the double-acting hydraulic cylinder. And electromagnetic control valve for switching the supply of hydraulic oil to the bets, and adjustable electromagnetic proportional valve a flow rate of the hydraulic fluid, the body frame side of the first or second arm
And is fixed to the first or second arm.
Switch means for detecting the rotational position of the pin
The drive motor rotates the drive vehicle to slide the platform in the front-rear direction via the belt-shaped or chain-like body, and the electromagnetic proportional valve raises the side frame. In the process, the switch means detects that the first and second arms have approached the vertical state.
, And the throttle of the flow rate of the hydraulic oil is started .

[0009]

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lifting device according to the present invention will be described with reference to the drawings.

FIG. 1 shows an overall configuration of an embodiment according to the present invention, in which a platform is pulled out (up state).
FIG. 2 is a side view of the platform in a lowered state, FIG. 3 is a plan view of the platform in a pulled-out state (up state), and FIG. 4 is a front view of the same cross-section of the platform.

In these figures, reference numeral 1 denotes a van-type vehicle (box-type vehicle), and a pair of main body frames 2 are erected and fixed on a rear floor 1a near a rear opening of the body of the van-type vehicle. I have. As shown in FIG. 4, the main frame 2 provided on each side of the rear floor 1a has a pin 3a at a position near one end of a main arm 3 constituting a parallel link, and a pin 4a at one end of a sub arm 4. Each is pivoted.
The other ends of the main arm 3 and the sub arm 4 have pins 3b and 4
The side frame 5 is pivotally mounted at b.

As shown in FIGS. 5 and 6, a pair of side frames 5 which are located on both sides of the platform 10 and slidably support the platform 10 are integrally fixed to each other by a plurality of horizontal connecting members 6. I have.

As shown in FIG. 1, one end of a double-acting hydraulic cylinder 20 for driving up and down is pivotally connected to the body frame 2 by a pin 21. The piston rod of the double-acting hydraulic cylinder 20 is The arm 3 is pivotally attached to one end. Therefore, when the double-acting hydraulic cylinder 20 is extended, the side frame 5 is at the raised position, and when the double-acting hydraulic cylinder 20 is contracted, the side frame 5 is at the lowered position. A power unit 50 for supplying hydraulic oil to the double-acting hydraulic cylinder 20 for elevation drive through a hydraulic circuit is provided on the main body frame 2.
And an electromagnetically operated valve 51 for switching the supply of hydraulic oil to two ports of the double-acting hydraulic cylinder 20, and an electromagnetic proportional valve 52 capable of adjusting the flow rate of the hydraulic oil.
Details of the hydraulic circuit having these valves will be described later.

As shown in FIGS. 4 to 6, a plurality of rollers 11 are pivotally mounted on the inner surfaces of the side frames 5 on both sides of the platform 10 in order to support the platform 10 slidably in the front-rear direction. , Platform 10
A guide rail 12 having a substantially U-shaped cross section in which a roller 11 slides inside is fixed to both sides of the guide rail.

As shown in FIGS. 1 to 3, the platform 1
The front and rear edges of the front wheel stop plate 30 and the rear wheel stop plate 40
Are connected to each other by hinges 31 and 41 so as to be able to move up and down.

The front brace plate 30 is designed to be manually raised and lowered, and a lock pin 33 is fixed to one side of the brace plate 30 via a mounting plate 32. Also, Platform 1
A lock lever mounting bracket 34 is fixed to one front end of the lock lever 0, and a lock lever 36 is pivotally connected to the lock lever mounting bracket 34 with a pin. The lock lever 36 is urged by a spring in a direction in which a hook portion at the distal end engages with the lock pin 33. When the lock pin 33 and the lock lever 36 are disengaged from each other, the front brace plate 30 is in a prone state in which the tip is lowered by its own weight, but the front brace plate 30 is manually operated.
Is raised to about 45 degrees, and the hook portion of the lock lever 36 is engaged with the lock pin 33, so that the front side stop plate 3
0 can be held (locked) in an upright state.

The rear wheel stopper plate 40 is also used for manually raising and lowering, so that it can be kept upright. In addition, when the lock in the upright state is released, it can freely rotate.

The position of the platform 10 at which the platform 10 is to be pulled out and the position at which the platform 10 is to be retracted are defined by guide rails 12 having a substantially U-shaped cross section.
And the like.

As shown in FIGS. 1 to 5, a platform automatic sliding mechanism 60 is provided for sliding the platform 10 between the pair of side frames 5 between the retractable position and the retractable position. I have. The platform automatic slide mechanism 60 includes two ends G, on the lower surface of the platform 10 along a substantially U-shaped cross section guide rail 12 provided in the front-rear direction of the platform 10.
5 and 6, a motor (electric motor) 62 with a speed reducer installed and fixed on a horizontal connecting member 6 connecting the side frames 5 as shown in FIGS. A belt wheel (drive wheel; pulley) 63 fixed to a rotary drive shaft 62 and a pair of guide rollers (driven wheels) 65 pivotally attached to a support plate 64 fixed to the horizontal connecting member 6 side so as to rotate freely. Have. The belt wheel 6
Reference numeral 3 denotes an outer peripheral surface having irregularities that mesh with the teeth of the toothed belt 61. The toothed belt 61 is guided by guide rollers 65 and is wound around the belt wheel 63. Here, the toothed belt 61 functions as a belt-like or chain-like body that drives the platform 10 by changing the rotational driving force of the motor 62 into a pulling force.

1 to 3, if the belt wheel 63 is rotated counterclockwise by the motor 62 with a speed reducer, the toothed belt 6 is rotated.
1 is sent rightward, and as a result, the platform 10 moves out of the passenger compartment in the pulling-out direction, and reaches the drawing-out limit position indicated by the solid line K in FIG. Conversely, if the belt wheel 63 is rotated clockwise,
The toothed belt 61 is moved to the left, and as a result, the platform 10 moves in the direction of being pulled into the vehicle interior, and is in the drawing limit position of the virtual line J in FIG.

FIG. 7 shows the double-acting hydraulic cylinder 2 for raising and lowering the drive.
A power unit 50 for supplying hydraulic oil to the solenoid valve 0, an electromagnetic valve 51 for switching supply of hydraulic oil to two ports of the double-acting hydraulic cylinder 20, an electromagnetic proportional valve 52 for adjusting the flow rate of the hydraulic oil, The hydraulic circuit includes: Here, the power unit 50 includes a motor M that operates when the main relay MR is excited, a pump PP that is driven to rotate by the motor M, pumps hydraulic oil from the oil tank 53, and sends it out through the check valve 54, A relief valve 55 that sometimes returns hydraulic oil to the oil tank 53.

As shown in FIGS. 8 and 9, an electromagnetic operation valve 51 and an electromagnetic proportional valve 52 capable of adjusting the flow rate of hydraulic oil are provided.
Means a manifold block 56 having a hydraulic oil passage formed therein.
The manifold block 56 is provided with ports A and B connected to two ports of the double-acting hydraulic cylinder 20 for elevation drive and ports P and T connected to the power unit 50.

FIG. 10 shows microswitches MS1 and MS1 serving as switch means for defining a range for limiting the flow rate of hydraulic oil supplied to the double-acting hydraulic cylinder 20 for driving up and down.
The arrangement of MS2 and MS3 is shown. As shown in this figure, a pin fixed to the sub arm 4 (a pivot point on the body frame side)
A cam 57 is fixed to the pin 4a, and a micro switch M fixed to the cam 57 on the main body frame 2 side.
S1 and MS2 come into contact with each other. When the main arm 3 of FIG. 11 turns from the lower position a to the upper limit position c and approaches the vertical position,
That is, the cam 5 at the intermediate position b (about 20 degrees before the top dead center)
7, the passage of the position b is detected, and thereafter, the electromagnetic proportional valve 52 is excited to reach the ascending limit position c to reduce the flow rate of the hydraulic oil. Also, the microswitch
S2 is activated by the cam 57 at a middle position b in the process of the main arm 3 of FIG. 11 rotating from the upper limit position c toward the lowering position a to detect the passage of the position b. The platform 10 is lowered by its own weight until reaching a (power supply to the power unit 50 is turned off). Further, the microswitch MS3
Is fixed to the front end of the main body frame 2, and when the main arm 3 of FIG. 11 is rotated to the ascending limit position c and the front end of the side frame 5 is pulled inside the main body frame 2, To detect the ascending limit position c.

Next, the overall operation of the embodiment according to the present invention will be described.

First, the virtual line J in FIG.
When the platform 10 is stored in the retracted state as described in the above, a wheelchair or the like in the vehicle compartment can be transferred onto the platform 10. At this time, the rear wheel stopper plate 40
Is locked in an upright position to prevent a wheelchair or the like from falling.

Before the platform 10 is pulled out, the front wheel stopper plate 30 is set up. That is, as shown in FIG. 1, the lock lever 33 on the platform 10 is engaged with the lock pin 33 on the front brace plate 30 to lock. Thereafter, a motor 62 with a speed reducer of the platform automatic slide mechanism 60 is energized to drive the belt wheel 63 to rotate, and the platform 10 at the retracted limit position as shown by the imaginary line J in FIG. 1 is pulled out to the drawing limit position of the solid line K.

The solenoid operated valve 51 in the hydraulic circuit shown in FIG.
The hydraulic oil from the power unit 50 is supplied to the double-acting hydraulic cylinder 20 for raising and lowering drive through the port B, and is contracted, and the main arm 3 and the sub-arm 4 are rotated to move the platform 10 to the rear edge of the vehicle body floor surface. From the position to the landing state shown by the solid line in FIG. At this time, the micro-switch MS2 in FIG. 10 is actuated by the cam 57 at the halfway position b where the main arm 3 has turned about 20 degrees downward from the top dead center in FIG. 11, and the excitation of the main relay MR in FIG. 7 is stopped. I do. For this reason, the power supply to the power unit 50 is turned off, and thereafter the platform 10 descends to the landing position (the descending position a) by the weight of the platform 10 and the load on the platform. Thereby, the impact at the time of landing on the platform is reduced. The front wheel stop plate 30 and the rear wheel stop plate 40 are held (locked) in an upright state during the elevating operation of the platform 10 to prevent the wheelchair CH and the like shown by phantom lines in FIGS. 1 and 2 from falling.

As shown by the solid line in FIG.
When the vehicle has completely landed, the wheelchair CH and the like can be moved to the ground by operating the rear wheel stopper plate 40 so that the rear wheel stopper plate 40 is turned down.

When a wheelchair or the like on the ground is to be loaded into the van-type vehicle 1, a wheelchair CH or the like is placed on the platform 10 in a landing state via a rear-side stop plate 40 in a prone state, and the rear-side stop plate 40 After standing up, the power unit 5 is connected through the port A of the solenoid operated valve 51 in the hydraulic circuit of FIG.
Hydraulic oil from 0 is supplied to the vertical drive double-acting hydraulic cylinder 20, and the vertical drive double-acting hydraulic cylinder 20 is extended to raise the platform 10 to the upper limit position. At this time, the intermediate position b about 20 degrees before the top dead center in FIG.
When the main arm 3 rotates, the microswitch MS1 shown in FIG. 10 is actuated by the cam 57, and the electromagnetic proportional valve 5 shown in FIG.
As a result, the power unit 50
The flow rate of the hydraulic oil returning to is reduced. Therefore, thereafter, the rotation of the main arm 3 toward the ascending limit position c becomes slow, and the impact when the side frame 5 and the platform 10 reach the ascending limit position and hit the main body frame 2 side can be reduced.

When the main arm 3 is at the upper limit position c in FIG. 11 and the side frame 5 and the platform 10 are also at the upper limit position as indicated by the solid line K in FIG. 1, the microswitch MS3 in FIG. And
Detect their arrival at the ascending position. Thereafter, the motor 62 with the speed reducer of the platform automatic slide mechanism 60
, And the platform 10 in the drawn state of the solid line K in FIG. After the platform is retracted to the retraction limit position, the wheelchair C
H and the like are transferred to the vehicle body floor 1a.

The front wheel stop plate 30 is held upright when the platform 10 is pulled out, and the rear wheel stop plate 40 is locked in the upright position except when the platform 10 is landing. Etc. can be prevented.

According to this embodiment, the following effects can be obtained.

(1) The platform 10 can be retracted into the vehicle body as well as raised and lowered, so that the operability of the user such as a wheelchair or a trolley can be improved, the smooth use of the wheelchair or the trolley can be realized, and the safety can be improved. Improvement can be achieved. That is, there is no need to perform a wheelchair operation on the platform when the vehicle is at the ascending position outside the vehicle body, and the wheelchair user does not feel uneasy.

(2) The operation of retracting the platform 10 into and out of the vehicle body can be automated by the platform automatic slide mechanism 60, so that the operability can be further improved.

(3) The hydraulic circuit of the double-acting hydraulic cylinder 20 for raising and lowering the drive for driving the platform 10 up and down is devised.
The solenoid operated valve 51 and the electromagnetic proportional valve 52 are combined, and the flow rate of the hydraulic oil to the double-acting hydraulic cylinder 20 for vertical drive is controlled by the electromagnetic proportional valve 52 at a position before the main arm 3 reaches the vertical top dead center. And the impact when the side frame 5 and the platform 10 reach the upper limit position can be reduced. In addition, the solenoid operated valve 51 and the electromagnetic proportional valve 52 are connected by a manifold block 56, so that the number of steps of the hydraulic piping can be reduced.
The flow rate of the hydraulic oil can be reduced to an appropriate amount by adjusting the current for exciting the electromagnetic proportional valve 52.

FIG. 12 shows a double-acting hydraulic cylinder 20 for driving up and down.
This is a comparative example of a hydraulic circuit including a power unit 50 for operating a hydraulic circuit, and uses a commercially available electromagnetic proportional valve 70 also serving as an operation valve. In this case, since the electromagnetic proportional valve 70 has a large amount of internal leak, a solenoid check valve 71 is required at each of the two ports of the double-acting hydraulic cylinder 20 for raising and lowering drive. In addition, an in-line check valve 72 is provided to lower the platform 10 by its own weight. (Electromagnetic proportional valve 7
0 is structurally inoperative unless the P port is pressurized).

In the comparative example shown in FIG. 12, there is a problem that the number of parts is increased and the number of piping steps is increased. On the other hand, it can be seen that the hydraulic circuit according to the embodiment of the present invention shown in FIG. 7 has fewer parts and less man-hours for piping than the comparative example shown in FIG.

The mounting position of the cylinder 20 can be changed as long as at least one of the main arm and the sub arm as the first and second arms forming the parallel link can be rotated.

Although the rotation of the sub arm 4 is detected by the micro switches MS1 and MS2, the rotation of the main arm 3 may be detected.

Further, a toothed belt 61 is used as a belt-shaped or chain-like body, and a belt wheel 63 is used as a driving wheel for driving the toothed belt 61. A configuration in which a sprocket or the like is used as a driving vehicle for driving a chain or the like may be adopted.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. There will be.

[0043]

As described above, according to the elevating device of the present invention, not only can the platform be raised and lowered, but also it can be retracted into the body of a van type car or the like, thereby improving the operability of a user such as a wheelchair or a bogie. Good, smooth use of a wheelchair, a trolley, etc. can be realized, and safety can be improved. In particular, since it is not necessary to operate the wheelchair on the platform when the vehicle is at the ascending position outside the vehicle body, the user does not feel uneasy.

Further, the operability can be further improved by automating the operation of retracting the platform into and out of the vehicle body.

Further, by devising the hydraulic circuit, it is possible to smoothly raise and lower the platform and reduce the impact at the platform ascending limit position.

[Brief description of the drawings]

FIG. 1 is a side view showing an embodiment of a lifting device according to the present invention and showing an overall configuration.

FIG. 2 is a side view showing a lowered state of the platform in the embodiment.

FIG. 3 is a plan view of the platform in a raised state.

FIG. 4 is a front view of a section of the platform.

FIG. 5 is a side view of a side frame, a connecting member, and the like.

FIG. 6 is a plan view of the same.

FIG. 7 is a hydraulic circuit diagram showing a hydraulic circuit in the embodiment.

FIG. 8 is a side view showing a combined structure of an electromagnetically operated valve and an electromagnetic proportional valve used in the hydraulic circuit.

FIG. 9 is a front view of the same.

FIG. 10 is an enlarged side sectional view of a main body frame and its surroundings showing an arrangement of micro switches for detecting states of a main arm and side frames.

FIG. 11 is an explanatory diagram showing a rotating state of a main arm.

FIG. 12 is a hydraulic circuit diagram showing a comparative example of the hydraulic circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Van type vehicle 2 Main body frame 3 Main arm 4 Sub arm 5 Side frame 6 Horizontal connecting member 10 Platform 11 Roller 12 Guide rail 20 Double-acting hydraulic cylinder for raising / lowering drive 30 Front-side stop plate 40 Rear-side stop plate 50 Power unit 51 Electromagnetic valve 52 Electromagnetic proportional valve 56 Manifold block 60 Platform automatic slide mechanism 61 Toothed belt 62 Motor with reduction gear 63 Belt wheel 65 Guide roller MS1, MS2, MS3 Micro switch

Continuation of the front page (56) References JP-A-8-268138 (JP, A) JP-A-6-292695 (JP, A) JP-A-58-49532 (JP, A) JP-A-57-149027 (JP) , U) Japanese Utility Model Showa 52-115012 (JP, U) Japanese Utility Model Showa 52-1150111 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60P 1/44 A61G 3/00 502

Claims (1)

(57) [Claims] 1. A pair of body frames fixed to a floor of a vehicle body, first and second arms each having one end pivotally attached to each body frame, and the other end of each of the first and second arms. Side frames each pivotally mounted, a platform slidably mounted in the front and rear direction with respect to the side frames, and a double-acting hydraulic cylinder for driving the platform up and down by rotating the first or second arm. A belt-shaped or chain-like body having both ends fixed to the platform, and a drive motor attached to a connecting member that connects the side frames located on both sides of the platform;
A drive wheel around which the belt-shaped or chain-shaped body is wound and which is driven to rotate by the drive motor;
One of the ports and the solenoid operated valve for switching the supply of hydraulic fluid, and the flow rate of the hydraulic fluid adjustable electromagnetic proportional valve, wherein
A pivot point of the first or second arm on the body frame side;
And a pin fixed to the first or second arm.
Switch means for detecting the rotational position of the electromagnetic proportional valve , wherein the drive motor rotationally drives the drive vehicle to slide the platform in the front-rear direction via the belt-shaped or chain-like body. Operates when the switch means detects that the first and second arms are approaching the vertical state during the process of raising the side frame.
An elevating device that starts to restrict the flow rate of hydraulic oil .