Multi-blade folding knife with lock open feature

  • US 4,805,303 A
  • Filed: 03/10/1988
  • Issued: 02/21/1989
  • Est. Priority Date: 03/10/1988
  • Status: Expired due to Term
First Claim
Patent Images

1. In a folding knife having a handle portion and at least two blades each having a tang portion pivotally mounted for movement about a common axis at one end of said handle for movement of said blades between closed and open positions, locking and release mechanism for releasably securing each of said blades in the fully open position, said mechanism comprising, in combination:

  • (a) a first lock lever mounted upon said handle for limited pivotal movement with respect thereto about a pivot axis parallel to said common axis, and having a first end portion configured for engagement in a notch in the tang portion of a first of said blades which is aligned with said first lock lever first end portion when said first blade is in its fully open position, wherein said first lock lever and said first blade are in substantially longitudinally aligned relation;

    (b) a first beam spring mounted upon said handle, and having a first end portion anchored to said handle at the end thereof opposite said one end, and a second end contacting said first lock lever at a position on the opposite side of said pivot axis from said first lock lever first end portion and exerting a biasing force urging said first lock lever toward rotation in a direction moving said first lock lever first end portion into engagement with said notch in said first blade tang portion, said first spring second end being flexibly moveable against said biasing force by manual pressure exerted on a predetermined portion of said first lock lever;

    (c) a second lock lever mounted upon said handle for limited pivotal movement with respect thereto about said pivot axis, and having a first end portion configured for engagement in a notch in the tang portion of a second of said blades which is aligned with said second lock lever first end portion when said second blade is in its fully open position, wherein said second lock lever and said second blade are in substantially longitudinally aligned relation;

    (d) a second beam spring mounted upon said handle, and having a first end portion anchored to said handle at said opposite end thereof, and a second end contacting said second lock lever at a position on the opposite side of said pivot axis from said second lock lever first end portion and exerting a biasing force urging said second lock lever toward rotation in a direction moving said second lock lever first end portion into engagement with said second blade tang portion, said second spring second end being flexibly moveable against said biasing force by manual pressure exerted on a predetermined portion of said second lock lever; and

    (e) means longitudinally spaced along said handle at said opposite end thereof defining said predetermined portions of said first and second lock levers.

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