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Plastic sprocket wheel with replaceable teeth

  • US 5,203,861 A
  • Filed: 12/18/1991
  • Issued: 04/20/1993
  • Est. Priority Date: 12/18/1991
  • Status: Expired due to Fees
First Claim
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1. A sprocket wheel with removable/replaceable teeth, said sprocket wheel comprisinga sprocket body having opposite side faces and a circumferential edge surface extending between said side faces, there being a plurality of recesses extending radially inwardly from openings spaced around said edge surface, with each recess opening at at least one of said side faces, each recess having a part narrowed circumferentially relative to its edge surface opening and located radially inwardly of the body edge surface,a corresponding plurality of tooth elements associated one with each respective recess, each tooth element including a tooth piece and a base piece, the base piece being receivable in its associated recess with the tooth element extending radially beyond the sprocket body edge surface, said base piece being configured complementally to the recess wherein received, the base piece having an envelope size larger than an envelope size of its associated recess, the sprocket body being made of a resilient material so that when said base piece is slidably removably inserted into its associated recess through the opening at the at least one body side face, body structure defining said recess is caused to elastically yield to admit said base piece in recess conformable occupancy and in tight frictional base piece external surface-to-recess surface interference fit, andmeans associated with each base piece and recess for maintaining the base piece when inserted in the recess, registered therein with an end surface of the base piece aligned flush with said sprocket body one side face.

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