×

TOOL MONITORING APPARATUS

  • US 3,747,085 A
  • Filed: 11/03/1971
  • Issued: 07/17/1973
  • Est. Priority Date: 11/03/1971
  • Status: Expired due to Term
First Claim
Patent Images

1. Tool monitoring apparatus comprising:

  • a. a housing; and

    b. sensing means positioned within said housing for sensing an elongated tool which may be of diverse widths and which is to be positioned through said housing and said sensing means, said sensing means including;

    1. a magnetic circuit having a pair of aligned tapered pole portions between which an air gap for receipt of said tool to be sensed is to be formed by removing sufficient amounts of said tapered portions to provide an air gap having a width substantially identical to that of said tool to be sensed;

    2. an input winding in inductive relationship with said circuit and having a pair of input terminals adapted to be coupled to a source of pulsating voltage; and

    3. an output winding in inductive relationship with said circuit and having a pair of output terminals adapted to be coupled to a monitoring circuit.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×