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Counter

  • US 9,987,441 B2
  • Filed: 07/13/2015
  • Issued: 06/05/2018
  • Est. Priority Date: 03/10/2009
  • Status: Active Grant
First Claim
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1. A counter comprising:

  • a first ring member having first indicia and a second ring member having second indicia, each of said first and second ring members being rotatable in increments about a common axis, one or both of said first and second indicia indicating a count; and

    a drive mechanism for rotating said first ring member and for rotating the second ring member after one or more predetermined degrees of rotation of the first ring member,wherein said drive mechanism comprises a pawl-and-teeth mechanism which comprises a first and second pawl engageable with a plurality of teeth, and wherein each of said first and second pawls comprise a driving engagement face for engaging in a driving engagement with one of said plurality of teeth, and a sliding engagement face for sliding over one of said plurality of teeth; and

    wherein each of said first and second pawls is arranged such that;

    said first pawl engages in a driving engagement with one of said plurality of teeth during a count stroke of said teeth, andsaid second pawl engages in a driving engagement with one of said plurality of teeth during a return stroke of said teeth, andsaid second pawl rides over one of said plurality of teeth during said count stroke, andsaid first pawl rides over one of said plurality of teeth during said return stroke.

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