×

Electrical instrument with removable calibrating knob

  • US 4,433,218 A
  • Filed: 08/17/1981
  • Issued: 02/21/1984
  • Est. Priority Date: 08/17/1981
  • Status: Expired due to Fees
First Claim
Patent Images

1. An electrical instrument comprising:

  • a housing comprising a face plate;

    a component for providing a variable electrical characteristic, said component being retained by said housing;

    a shaft having one end coupled to said component and rotatable to vary said electrical characteristics, said shaft extending through said face plate and having an opposite end adjacent thereto;

    a coupling means attached to said opposite end of said shaft, said coupling means and said shaft being shaped and arranged to permit only one given relative angular position therebetween and to prevent relative rotational movement therebetween while allowing relative axial movement therebetween during removal of said coupling means from said shaft;

    a knob attached to said coupling means, said knob and said coupling means being shaped and arranged to allow both relative axial and rotational movement therebetween;

    a locking means activatable to prevent said relative movement between said knob and said coupling means so as to permit removal of said knob and coupling from said shaft as a unit and to insure the repositioning thereof in said given relative angular position upon replacement of said unit on said shaft; and

    a scale located on said face plate adjacent to said knob so as to indicate the relative angular position thereof.

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