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Brake safety system for a power driven rotary mower

  • US 4,090,345 A
  • Filed: 11/15/1976
  • Issued: 05/23/1978
  • Est. Priority Date: 03/17/1976
  • Status: Expired due to Term
First Claim
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1. In combination with a rotary mower having a housing with a support deck, and a handle member for manually guiding directional movement of said mower:

  • A. a power driven rotary shaft projecting downwardly through said deck and having an end portion below the deck;

    B. a blade and first disc affixed to said end portion of the shaft;

    C. a rotary brake disc journalled on said end portion of the shaft and having spaced apart tooth means radially spaced from the axis of said rotary brake disc;

    D. means providing a spring loaded frictional driving connection between said discs;

    E. a pawl constrained to pivotal movement about an axis fixed with respect to said rotary shaft and yieldingly biased toward engagement with said tooth means;

    F. a manually operable control member movably associated with the handle member of the mower and operatively connected with said pawl so as to be yieldingly urged in one direction by the biasing force acting on the pawl, to a first position relative to the handle member in which position the pawl is engaged with said tooth means and from which position it is movable in the opposite direction to a second position holding the pawl disengaged from said tooth means and permitting power driven rotation of the mower blade; and

    G. manually activated gravity deactivated latch means arranged to react between said members and upon being activated hold said control member in said second position, as long as said manually operable control member is not moved farther in said opposite direction, whereby upon gravity effected deactivation of the latch means said control member must be manually held against movement to its first position to permit continued power driven rotation of said blade.

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