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SPRING-OPERATED FIELD STRENGTH MEASURING DEVICE IN AN ELECTROMAGNETIC-TYPE AMPEREMETER

  • US 3,611,136 A
  • Filed: 09/29/1969
  • Issued: 10/05/1971
  • Est. Priority Date: 09/29/1969
  • Status: Expired due to Term
First Claim
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1. A magnetic field-strength-measuring device in an electromagnetic clamp-on-type amperemeter which comprises a housing, a stationary core member fixedly mounted at one end on said housing of said amperemeter;

  • a movable core member, said movable core member pivotally mounted at said same end on said housing as said stationary core;

    said movable core member being integrally formed with a handle and a cam portion;

    said handle being actuatable to move said movable core member away from said stationary core member from a closed position in which said members are in abutting relation to an open position in which said members are spaced apart, and a spring-loaded cam portionengaging means disposed in abutment against said cam portion, said cam portion including a first, concave cam surface and a second, cam surface the radius of curvature of which increases from the axis of rotation of said movable core member toward the point of abutment of said spring-loaded cam portion-engaging means as the movable core member is pivoted inward toward said closed position where the first cam surface locks the core members in abutting relation.

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