JPS622025Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) This invention relates to a control device for an electric wheelchair, which allows the operating force of the control lever to be easily changed, and also prevents rainwater etc. from splashing on the mechanism. , which ensures stable operation over a long period of time.

(Prior Art) Since the user of the electric wheelchair is a physically disabled person, it is desirable that the electric wheelchair be easily maneuverable. Therefore, there is a device in which a single operating lever is tilted in the desired direction, and motors attached to the left and right wheels are appropriately driven to move the vehicle in the desired direction. The operating lever in this case is called a joystate lever, and when released, it returns to the neutral position by the force of a spring.

The structure for returning the operating lever to the neutral position is to form a spherical part on a part of the operating lever, receive this spherical part in the housing, and push the spherical part into the housing against the spherical part receiving part of the housing. It is common to use a piston that presses the piston and a spring that presses the piston. In devices with this type of structure, the operating force of the operating lever is determined by the strength of the spring, so if you try to change the operating force, you have the problem of having to replace the spring with one of different specifications. Ta. Since this work is performed by disassembling the mechanical parts, it is complicated and increases the number of man-hours, and it is difficult to obtain the optimum operating force for each user.

(Purpose of the invention) An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional devices and to provide a control device for an electric wheelchair that can provide stable operation over a long period of time.

(Structure of the invention) In order to achieve the above-mentioned object, the present invention screws into the housing an adjustment screw that applies a load to the spring, and covers the entire assembly including the adjustment screw and the housing with a case.
This case has an adjustment hole drilled in a portion facing the adjustment screw. With this configuration, the strength of the spring can be easily changed using a tool inserted from the outside of the case, making it easy to adjust the operating force of the operating lever to match the operator's force. can be adjusted to

In addition, since the entire housing, including the adjustment screw and housing, is covered by a case, rainwater etc. do not directly splash onto these parts, which prevents the adjustment screw from becoming stuck or damaged due to rusting, etc. There is no.

(Embodiment) Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1. Reference numeral 1 denotes an operating lever with a handle 2 attached to its upper end. Approximately in the middle of the operating lever 1, a boss 3 with a hemispherical upper part connects to a pin 4.
installed by. On the outer periphery of boss 3,
A cup-shaped housing 7 having a hole 5 and a boss sliding surface 6 is located at the center of the upper part, and is attached to a bottom plate 11 with screws 10 via a retainer 9 attached with screws 8. The bottom plate 11 is
It forms part of a case 12 that covers the entire area from the bottom plate 11 to the housing 7. A hole 13 is provided in the center of the upper part of the case 12, and the operating lever 1 is made to protrude from the hole 13.

A cup-shaped slider 14 that is open at the top is engaged with the lower end of the operating lever 1, and changes its posture when the operating lever 1 is tilted. A shaft 16 of a variable resistor 15 is attached to the upper end of the slider 14, and the operating lever 1
When tilted, the resistance value changes according to the angle. A piston 17 is disposed inside the housing 7, and a portion of the piston 17 presses against the lower surface of the boss 3.

A spring 19 is provided between the piston 17 and an adjustment screw 18 screwed into the lower end of the housing 7.
is interposed to provide an upward force to the piston 17. The adjustment screw 18 has a shape as shown in FIG. 2, and is provided with a plurality of notches 20 at its lower end.On the other hand, the bottom plate 11 has a shape of the outer circumference of the adjustment screw 18 located at the outer circumference of the adjustment screw 18. An arc-shaped adjustment hole 21 as shown in FIG.

With this operating device configured in this way, the operating force of the operating lever 1 can be adjusted steplessly by rotating the adjustment screw 18 and changing the degree of compression of the spring 19. To rotate the adjustment screw 18, use the adjustment hole 21 in the bottom plate 11.
What is necessary is to insert a suitable tool such as a screwdriver through the hole and press the notch 20 with the tip of the tool. As shown in FIG. 3, the words "strong" and "weak" and arrows are written on the bottom plate 11 to facilitate adjustment.

(Effects of the Invention) Since the present invention is configured as described above, the operating force of the operating lever can be adjusted linearly within a certain range. This adjustment can be easily performed from outside the case (the bottom plate forming a part of the case). In addition, since the entire housing, including the adjustment screw and housing, is covered by a case, rainwater etc. will not directly splash onto these parts, and therefore the adjustment screw will not become stuck or damaged due to rusting, etc. stable operation over a long period of time. moreover,
Since the structure is simple, it also has the advantage that it can be implemented at low cost.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of one embodiment of the present invention, FIG. 2 is a sectional view of the adjustment screw in FIG. 1, and FIG. 3 is a bottom view showing the shape of the adjustment hole provided in the bottom plate. 1... Operation lever, 3... Boss, 7... Housing, 11... Bottom plate, 12... Case, 17...
Piston, 18...adjustment screw, 19...spring, 20...notch, 21...adjustment hole.

Claims (1)

[Scope of utility model registration request] In a control device for an electric wheelchair in which an operating lever is tiltably supported with respect to a housing and a restoring force is applied to the operating lever by a spring, an adjustment screw that applies a load to the spring is screwed into the housing, and A control device for an electric wheelchair, characterized in that the adjustment screw and the housing are entirely covered with a case, and an adjustment hole is bored in a portion of the case that faces the adjustment screw.