| 摘要 |
<p>1,111,304. Electromagnets. WEATHERHEAD CO. 23 Dec., 1965 [15 March, 1965; 1 Dec., 1965], No. 36542/66. Divided out of 1,111,303. Heading H1P. [Also in Division G3] A torque motor comprises side plates 101, 102 separated by spacer blocks 103, 104 and U-shaped block 106 in which armature 120 is pivoted by pin 121. The side plates are spaced apart by permanent bar magnets 116, 117 (Fig. 4, not shown) normal thereto which are polarized along the edges adjacent the side plates so that the latter are of opposed magnetic polarities. A solenoid coil 123 surrounds the armature within the side plates and permanent magnets, and below the spacer blocks with connection to terminal block (Fig. 4, not shown) carrying further connections over cable 131 emerging through loss and gland 136 retaining rubber bush 134. U-shaped pole pieces 138, 139 are screwed to side plates 101, 102 to define a gap permitting lateral movement of the free end of the armature between spring loaded screwadjusted plungers 146, 147. The pole pieces are normally magnetized in opposition, and excitation of coil 123 polarizes the free end of the armature in a sense dependent on the current direction, so that deflection is substantially linearly proportional to the current, and controls a hydraulic pilot valve 78 over rod 76 to operate a main valve 40 in accordance with the magnitude and sense of the energization current, with mechanical feedback to the armature over rod 160, coil spring 166, and button 163 as described in Specification 1,111,303. Manual, hydraulic, or pneumatic over-rides are applicable to the armature.</p> |
