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Coilable rule with automatic recoil

  • US 4,189,107 A
  • Filed: 06/15/1978
  • Issued: 02/19/1980
  • Est. Priority Date: 06/16/1977
  • Status: Expired due to Term
First Claim
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1. A length measuring instrument comprising:

  • a housing;

    a spool mounted for rotation in the housing;

    a measuring tape mounted on the spool;

    an electrical motor for rotating the spool to wind the tape thereon; and

    a reduction mechanism between the motor and the spool;

    said instrument characterised in that the housing provides a nonrotatable hollow hub and the motor and reduction mechanism are disposed within the hollow hub coaxially with the spool.

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