| 摘要 |
A bearing having a spherical bearing surface is attached to an opening formed at the center of the top wall of a casing. The bearing rotatably receives a spherical body having a control shaft which extends through the center of the spherical body and is securely fixed thereto. A plurality of rotary discs is spaced from, and juxtaposed on, the bottom wall of the casing. Each of the juxtaposed pairs of the rotary discs is rotatably coupled to one end of an elongated slidable member having an elongated guide slot in such a manner that the elongated member is moved transversely to the longitudinal axis thereof. Circular resistive elements are arranged on the bottom wall of the casing in opposed relation to the rotary discs. Each of the rotary discs has on its lower surface a contactor in slidable electrical contact with the corresponding resistive element. The lower end of the control shaft slidably extends through the guide slots of the elongated members which cross each other, but do not interfere with each other. An upright side member may be provided at each end of the elongated member to produce the effect of inertia for smooth movement of the elongated members. As the control shaft is rotated or inclined in any direction, the point of contact on each of two or four resistive elements may be simultaneously controlled.
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