JPS63206245A - Seat falling stop apparatus of electromotive wheelchair - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a seat lowering and stopping device for an electric wheelchair provided with a seat that can be raised and lowered relative to a frame.

(Prior Art) Some electric wheelchairs have a seat that can be raised and lowered relative to a frame. This allows the seat to be raised to suit the physique of the passenger and to facilitate boarding and alighting. This elevating device is operated by operating an elevating switch on a control box, and raises and lowers the seat within a predetermined range.

(Problems to be solved by Development II) The prior art for this type of electric wheelchair is
6-68450, but the one described in this publication does not have a stop mechanism when the seat is lowered, so even if the passenger's hand or foot is caught between the seat and the vehicle body, the lift switch cannot be lowered. As long as you push it to the side, the seat will fall, which will affect your body. This is all the more problematic since the passenger is a disabled passenger. Furthermore, since a cheno is used to raise and lower the seat, there is a risk that the operating cheno may come off if the seat runs on casters or obstacles when lowering. Furthermore, there is also the problem that if the chino comes off like this, the seat may fall suddenly. The present invention aims to solve these problems in 1'! This was done as a goal.

(Means for solving the problem) As a final means to solve the above problem, Shukan 11 installs poles upward from both the left and right sides of the frame, and supports the seat in a manner that allows it to move up and down using rollers. A motor is used to raise and lower the seat, and a plate is provided at the bottom of the seat that is biased downward. The configuration includes a switch that stops the motor.

(Function) With this configuration, when the seat comes into contact with a plate, a finger, or other obstacle and receives an upward force while lowering, the switch will operate and stop the subsequent lowering movement. You will be able to do it.

(Example) Hereinafter, an example of the present invention will be explained with reference to the drawings. J
What is shown in Fig. Si is an electric wheelchair according to the present invention,
2 is a frame, and 2 is a pole erected diagonally upward from the rear of the frame 1. As will be described later, two poles are provided on the left and right at appropriate intervals. A front wheel 3 is supported at the front part of the frame l so that the direction f can be changed freely within the ice plane f, and a rear wheel 4 is provided at the rear part. The rear wheels 4 are provided with rotational force by a drive device whose power source is a battery (not shown). For pole 2,
The seat 5 is supported by rollers 6.7, which are raised and lowered by a structure to be described later. The seat 5 is roughly composed of a seat cushion 8, a seat frame 9, and a seat bracket IO, and the rollers 6.7 mentioned above are rotatably attached to the upper and lower ends of the seat bracket IO by shafts II and +2. . The upper roller 6 is in contact with the pole 2 from behind the pole 2, and the lower roller 7 is in contact with the pole 2.
is in contact with pole 2 from the front (see Fig. 3 for a part). By doing this, when a person sits on the seat back 8, both rollers 6 and 7 come into strong contact with the pole 2 due to the weight of the person, and the rollers 6 and 7 are pressed against the weight of the pole 2. A seat back (not shown) is attached between the seat frames 9 on both sides.

An armrest 13 is provided at the top of the seat frame 9 of the seat 5.
control box 14 is attached to the front of the control box 14.
or installed. The control box 14 includes a joystick lever 15 for moving the electric wheelchair forward, backward, left and right, and a switch 16 for raising and lowering the seat 5.
It is set upwards. seat cushion 8
A plate 17 is provided at the bottom of the plate 17 and is biased downward as described later. This plate 17 is a mechanism to prevent the passenger's fingers from getting caught when the seat 5 is lowered. At the front of the seat frame 9, the upper end of a step frame 19 having a step plate 18 attached to its lower end is supported by a shaft 20 so as to be rotatable in the vertical direction. 21 is an auxiliary roller attached to the lower end of the step frame 19.

FIG. 2 shows the seat lifting mechanism of FIG. 1. To explain this, 1. As shown in the figure, 4. Left and right rear wheels.
4 are provided at intervals, and a bracket 22 integral with the frame 1 is attached to the lower part between them. An elevating motor 23 for elevating and lowering the seat 5 is attached to the frame 22.
By the operation of 5? ＞+h and forward/reverse rotation are possible.

The lifting motor 23 has a speed reduction mechanism 24, and a gear 25 is attached to its output shaft. The gear 25 meshes with a gear 26 rotatably supported by the bracket 22,
The gear 26 is engaged with a gear 27 which rotates in the same direction as this gear 26. Sprockets 1-2 are coaxial to gears 26 and 27.
8.29 is installed. Therefore, if the lifting motor 23 operates, these sprockets 28 and 29
will rotate in the opposite direction at the same speed.

The bracket 22 has two sprockets 30 symmetrically arranged on the upper and lower sides. :ll, 32. ]: 6 sprockets are rotatably provided, and sprockets 34 and 35 are rotatably provided symmetrically at the upper ends of the left and right poles 2.2. And these four sprockets 28 on each side. :lO, 32, 34 and 29. :11.1
3.35 each has a portion of the spring 36.35.
En1-res cheno with the same length connected with 37: I8.
39 kake has been passed. As mentioned later, spring 3G
, 37 serve as a mechanism for preventing the chains 3fl and 39 from slacking. As shown enlarged in Figure 4, Cheno 38 (3
! A bolt 40 without a head is connected to one end of l), and is fixed with nuts 41 and 42 to an upper bracket 41 that projects laterally from the seat bracket IO. As a result, when Cheno:18 (:l'l) moves,
The seat bracket lO will also move along the pole 2. An under bracket 43 is also attached to the lower part of the upper bracket 41 on the seat bracket 10, and a rod 44 attached to the other end of the chino 3g (39) passes through the under bracket 43 so as to be freely movable in the longitudinal direction. are doing. The aforementioned spring 35 (37) is stretched between these bolts 40 and rods 44. Therefore, Cheno 38 (39) has this spring 3 [1 (
37) makes me constantly nervous. 45 is a stopper.

Next, the installation of the plate 17 will be explained using FIG. 5, which is a partially enlarged view of FIG. 1, and FIG. 6, which is a further enlarged partially of FIG. The plate 17 is attached to the lower end of the shaft 46 by inserting the shaft 46 into the seat frame 9 under the seat cushion 8 so as to be movable in the axial direction thereof. A washer 47 is interposed in a part of the shaft 46, and a compressed coil spring 48 is interposed between the washer 47 and the plate 17. This coil spring 48 applies a downward force to the plate 17. A washer 49 is attached to the upper end of the shaft 46.

A plate-shaped bracket 50 is welded to the seat frame 9, and the seat 5 is attached to the bracket 50 by screws 51.
A limit switch 52 is installed to regulate the lower limit of the lower limit. The limit switch 52 has five arms, and when the arm 53 is pressed in contact with the plate 17, it stops further lowering of the seat. Only a gap is provided between the tip of the arm 53 and the plate 17.

In the electric wheelchair of End 11, the seat 5 can be raised and lowered with respect to a frame 1 to which wheels are attached. Is raising and lowering the seat suitable for the passenger's physique and ensuring ease of boarding and exiting, and is it desirable and convenient?
It may also lead to a situation. This must therefore be prevented, especially since the passenger is a disabled person. Figures 7 to 9 show mechanisms for this purpose. That is, in the present invention, the movement of the chino 38 (:19) that raises and lowers the seat is detected, the height of the seat 5 is determined by the displacement of the chino 38 (39) with respect to the reference position, and the height of the seat 5 is adjusted as necessary. It is designed to stop the elevator from moving up and down.

In Figures 7 to 9, 54 is Cheno'18 (39
) attached to. It is a magnet as a sensor.

When the chino 38 (39) moves, this magnet 54 moves together with the pole 2 or the seat bracket 11.
When the user approaches a sort switch 55 attached to the screen, the contacts are switched. Three REET switches 55 are provided at different positions (described below with reference numerals 55, 56, and 57 in FIG. 10), and one magnet 54 approaches one after another to switch the contact. , the height of the seat 5 is detected.

FIG. 1O is a control circuit for an electric wheelchair according to the present invention;
Kono diagram! tiWfila (55.56.57)
7) 'J-1' switches, which are installed in the order shown in the figure from bottom to top with respect to the upright direction of the pole 2.

58 is a power switch, 59. l1tl is a terminal connected to a traveling motor (not shown). This control circuit is powered by DC 12 volts applied to the power terminals 61 and 62, and is connected to the lifting motor 23 and the lifting switch I6, and is connected to the lifting relay 63, the lowering relay 64, and the lifting limit relay. 65 and 66 are connected as shown.

In this electric wheelchair configured in this way, the user sits on the seat 5, puts his feet on the step board 18, and controls the control box 1.
The basic operation of driving by operating the joystick lever 15 of 4 is no different from the conventional one.
When sitting in the R seat, operate the lift switch 16 and move to seat 5.
In the electric wheelchair of the present invention, when the seat 5 is raised by operating the lowering switch 16, The driving force is obtained by one lifting motor and two motors. That is, when the lift switch 16 is operated and a rising current is applied to the lift motor 23 via the lift relay 64 to rotate it to the rise side, the rotational force is transmitted from the gear 25 to the gears 25 and 27. , the sprockets 28 and 29 are rotated in opposite directions at the same rotation speed. Then a pair of left and right chenos 38. :19 both move in the direction of raising the seat bracket lO, and the seat 5 is raised. Cheno 3
B. The spring 16.37 installed at the connection of 39 always absorbs the elongation of the chain 18.39 and prevents it from falling off the sprocket.

When the seat 5 is raised in this manner, and when the lift switch 16 is operated to lower the seat 5, the vicinity of the reed switch 55, 56, 57 is connected to the magnet 54 as a sensor (see Figs. 7 to 9). ), the reed switches 55, 56, and 57 sequentially change their contacts to raise and lower the seat and limit the movement of the electric wheelchair. That is, the leet switch 55 installed at the lowest position sets the seat 5 at the standard height, and when the seat 5 is raised from a lower position, it moves together with the chenno 38 (:19). The contacts are switched in response to the magnetic force of the magnet 54, and the rise of the seat 5 is temporarily stopped. Then press the lift switch 16 +
When the seat 5 is raised by operating the seat 5, the lift 56 is activated, the lift restriction relay 65 is switched, the power to the terminals 59 and 60 is cut off, and the travel motor (not shown) is activated. Even in this case, it is possible to raise the seat 5, so if the seat 5 is raised further, the reed switch 57 installed at the highest position switches the contact and the raising relay 63 The power to the seat 5 is cut off, and further elevation of the seat 5 is stopped.

Next, operate the lift switch 1G in the opposite direction, and turn the lift motor 2.
When a current is applied in the opposite direction to 3, the lifting motor 23 rotates in the opposite direction, moving the pair of left and right chenos: I8.39 in the direction in which the seat 5 is lowered, and the seat 5 is lowered. Cheno 38.
The installation of the magnet 54 or the reed switch 56 that moves together with 39 passes through the position.

Power supply voltage is applied to the terminals 59 and 60, and by operating the joystick lever 15 for driving control, the vehicle is ready to travel. Further operate the lift switch 16 to move to seat 5.
When the lowering of the limit switch 52 continues, the arm 53 of the limit switch 52 attached to the bracket 50 at the bottom of the seat frame 9 is pressed against the plate [7], and the contact point of the limit switch 52 is switched. As a result, the descending relay 64
Since power is cut off, the seat 5 will not be lowered any further, thus preventing fingers or the like from being caught between the seat 5 and the frame l. In this case, by making a slight modification to the circuit, the seat 5 can be automatically raised at the moment the limit switch 52 is activated.

(Effects of the Invention) As described above in detail, the present invention has a frame with wheels attached to its lower part, and poles are attached upward from both left and right sides, and a seat is supported on the poles in a manner that allows the seat to be raised and lowered using rollers. In addition, a plate is provided at the bottom of the seat that is biased downward, and a motor is provided on the top of this plate that lifts and lowers the seat when it receives an upward force. Since the seat is equipped with a stop switch, the seat can be automatically stopped even if the passenger's finger or the like is caught between the seat and a heavy object while the seat is being lowered. In addition, since the seat stops, it is possible to prevent the chain from coming off when the seat is lowered and the sudden fall of the seat, which has conventionally occurred.

[Brief explanation of the drawing]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is a rear view of the one in Fig. 1 seen from the right, Fig. 3 is an enlarged sectional view of the seat support part, and Fig. 4 is a chino connection. 5 is an enlarged side view of the seat part in FIG. 1, FIG. 6 is an enlarged sectional view of a part of the main part in FIG. FIG. 1O, a front view showing the relationship, is a circuit diagram of the control circuit. ■... Frame 2... Pole 5... Seat 6.7... Roller I6... Lifting switch 17... Plate 23... Lifting motor 3B, 39... Cheno 52. ...Limit switch 53...Arm 54...Magnet 55, 56.57...Reed switch patent Applicant Suzuki Motor Co., Ltd. (and 2 others) Fig. 11...Frame 2.Noτζ- Le 5 Maro
6,7 Roller 16...#Protection suiduute 17...Plate 23...Moke for hot weather 3
8, 39, Chen 52, Rimi, Hibiki no Tosuina 53
Arm 54, Magne Seat 55, 56, 57, 1 No. 1 Donutsch Fig. 2 Fig. 6 Fig. 4 Fig. 7 Fig. 9 Fig. 8

Claims (1)

[Claims] (1) Install poles upward from the left and right sides of the frame, support the seat on the poles so that they can move up and down with rollers, and raise and lower the seat using a motor. 1. A seat lowering stop device for an electric wheelchair, characterized in that a force-forced plate is provided, and a switch is provided above the plate to stop a lifting motor when the plate receives an upward force.