Duplex latch-bolt mechanism

  • US 5,074,605 A
  • Filed: 03/28/1989
  • Issued: 12/24/1991
  • Est. Priority Date: 03/28/1989
  • Status: Expired due to Term
First Claim
Patent Images

1. An improved duplex latch-bolt mechanism for use with a latch-handle assembly having a transfer member, the latch-bolt mechanism comprising:

  • a latch bolt head assembly having a housing and a movable latch bolt therein;

    a pair of spaced-apart coupling plate members (10,20) coupled at respective front end regions to the latch bolt head assembly housing, the coupling plate members each having an elongated backset opening;

    a bolt-extracting member (3) coupled to the latch bolt for movement frontwards and rearwards therewith, the bolt-extracting member being movably disposed between the coupling plate members for moving the latch bolt, the bolt-extracting member having a central open region (311) and front and rear extraction teeth means (31,32);

    a generally U-shaped displacement means (6) having first and second generally plate-like members with mutually aligned through-openings (63), the bolt-extracting member (3) being slideable disposed between the plate-like members, the plate-like members being slidably disposed between the coupling plate members (10,20)rotary cam means (4,5) mounted for rotation generally co-axially within said through-openings and having generally radially protruding surface means (41,51) positioned to engage a selected one of the front and rear extraction teeth means upon rotation of the rotary cam means to move the bolt-extraction member and thereby cause movement of the latch bolt,the rotary cam means being movable frontwards and rearwards within the central open region (311) of the bolt-extracting member by the displacement means (6) to be engagable with the selected one of the front and rear extraction teeth means,the rotary cam means being adapted for coupling to the transfer member of the latch handle assembly for responsive rotational movement therewith.

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