Machine element or mechanism – Control lever and linkage systems – Multiple controlled elements
Patent
1996-05-22
1998-05-26
Marmor, Charles A.
Machine element or mechanism
Control lever and linkage systems
Multiple controlled elements
74469, 338 68, G05G 104, H01C 1020
Patent
active
057551383
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an electrical lever assembly for outputting an electrical signal proportional to a rocking angle by a rocking motion of a lever.
BACKGROUND ART
As an electrical lever assembly, one disclosed in Japanese Unexamined Utility Model Publication (Kokai) No. Showa 62-140636 has been known. The electrical lever assembly disclosed therein is designed to support a lever in a housing for rocking motion in back and forth and left and right directions for causing a rocking motion of first and second gimbals so that a pair of front and back sides potentiometers are rotated by the rocking motion of the first gimbal for outputting an electrical signal, and so that a pair of left and right side potentiometers are rotated by the rocking motion of the second gimbal for outputting an electrical signal.
In such electrical lever assembly, an error in the output voltages of the potentiometers in relation to the rocking angle of the lever may be caused by error in machining and error in mounting.
For example, an error between the output voltage generated when the lever is rocked in one direction over a given angle and the output voltage generated when the lever is rocked in another direction over the same angle may be greater than or equal to a standardized value, or the error of the output voltage in relation to a unit rocking angle of the lever may be out of the standardized value.
When such error is caused in the output voltage of the potentiometer, it becomes very difficult to accurately control an electromagnetic valve corresponding to the rocking operation of the lever upon switching the position of the electromagnetic valve by outputting a control signal to the electromagnetic valve with inputting the output voltage of the potentiometer to a controller.
Therefore, in the prior art, an external resistor for adjusting the output voltage of the potentiometer is provided for adjustment, or in the alternative, an internal adjustment is made internally in the controller for adjusting the output voltage of the potentiometer.
However, when the external resistor is employed, assembling and adjusting operation becomes cumbersome. On the other hand, when the internal adjustment is made in the controller, compatibility of the lever assembly and the controller becomes poor to thereby cause a problem in term of the supply of parts.
The present invention has been worked out for solving the problems set forth above, and is thus intended to provide an electrical lever assembly which facilitates assembling and adjusting operations and to provide greater compatibility between the electrical lever assembly and a controller to thereby simplify the supply of parts.
DISCLOSURE OF THE INVENTION
In order to accomplish the above-mentioned object, an electrical lever assembly, according to the present invention, comprises surface of the main body; and condition adjustable with respect to a position in a vertical direction and a horizontal direction.
With the construction set forth above, by moving the potentiometer relative to the main body of the assembly in vertical and horizontal directions, the positional relationship of the rotary shaft of the potentiometer and the rod moving vertically by rocking motion of the lever can be easily adjusted, whereby an error of the output voltage of the potentiometer can be corrected, and thus assembling and adjusting operations can be facilitated, and compatibility of the electrical lever assembly can be improved so as to simplify the supply of parts.
In the construction set forth above, it is preferred that the potentiometer is mounted on a bracket in a condition adjustable with respect to height, and that the bracket is mounted on the lower surface of the main body in a condition adjustable with respect to a position in the horizontal direction perpendicular to a rotary shaft of the potentiometer.
On the other hand it is possible to interpose a shim between the bracket and the lower surface of the main body.
Also, it is preferred that the bracket compris
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Hayashi Seita
Mototani Masayoshi
Fenstermacher David M.
Komatsu Ltd.
Marmor Charles A.
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