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System for controlling energy output of combustion-powered, fastener-driving tool

  • US 5,592,580 A
  • Filed: 11/10/1994
  • Issued: 01/07/1997
  • Est. Priority Date: 11/10/1994
  • Status: Expired due to Term
First Claim
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1. In combination, a combustion-powered, fastener-driving tool exhibiting an energy output, and a system for controlling said energy output of said tool, comprising:

  • a combustion chamber defined within said combustion-powered, fastener-driving tool;

    fan means disposed within said combustion chamber of said tool for producing turbulence within said combustion chamber of said tool when said fan means is driven;

    motor means for driving said fan means when a driving voltage is applied across said motor means;

    battery means for providing said driving voltage to said motor means; and

    circuit means, for controlling said energy output of said tool by controlling the speed of said fan means, comprising first means for providing a setpoint voltage, and second means, including a comparator, for sampling a voltage proportional to said speed of said fan means, comparing said sampled voltage to said setpoint voltage, and selectively applying said driving voltage across said motor means if said sampled voltage is less than said setpoint voltage and terminating said driving voltage to said motor means if said sampled voltage is not less than said setpoint voltage.

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