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Quick zeroing knob assembly

  • US 6,508,144 B1
  • Filed: 05/14/2002
  • Issued: 01/21/2003
  • Est. Priority Date: 08/11/1999
  • Status: Expired due to Fees
First Claim
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1. A control knob for selecting the zero position of a mechanism without altering the actual position of the mechanism, the mechanism having a shaft having first and second ends and with retaining means at said first end and with a keyway located between said first and second end thereof, said control knob comprising:

  • (a) a ring with a key placed in said keyway, said ring having a first dimensioned opening;

    (b) a bushing having first and second ends with the second end having a lip thereat and with said bushing being dimensioned and placed around said shaft so that said lip abuts against said retaining means and so that said second end of said bushing abuts against said ring;

    (c) a knob for gripping and having an interior with first, second and third cutouts each having predetermined dimensions, said knob having a second opening dimensioned to be complementary to said first opening;

    (i) said first cutout being dimensioned so as to accept the insertion of said ring;

    (ii) said second cutout being dimensioned so as to accept the insertion of said first end of said bushing;

    (iii) said third cutout being dimensioned so as to accept said lip of said bushing;

    (d) a spring having first and second ends and dimensioned for insertion into both of said first and second cutouts and so that said first end thereof abuts against said lip of said bushing; and

    (e) a pin inserted into said knob and into said ring wherein the selection of the zero position is initiated by gripping and pulling said knob outward.

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