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Chain saw

  • US 4,534,005 A
  • Filed: 05/10/1982
  • Issued: 08/06/1985
  • Est. Priority Date: 05/14/1981
  • Status: Expired due to Term
First Claim
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1. A chain saw provided with an electromagnetic pump for feeding lubricant to saw chain, comprising an engine speed sensor for sensing the rpm of an engine and a microcomputer for controlling the operation of the electromagnetic pump, wherein;

  • said microcomputer having stored therein a plurality of stepped lubricant feeding patterns covering the number of actuations of the electomagnetic pump, the actuation frequency and the period of time of each actuation so as to control automatically the feeding of lubricant to the saw chain from the electromagnetic pump in response to the engine speed sensor to effect lubricant feeding in conformity with the sawing condition.

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