Push latch

  • US 7,152,892 B2
  • Filed: 11/16/2004
  • Issued: 12/26/2006
  • Est. Priority Date: 11/16/2004
  • Status: Active Grant
First Claim
Patent Images

1. A door latch selectively moveable between latched and unlatched positions along a latch axis, the door latch having opposing proximal and distal ends and comprising:

  • a latch assembly, including;

    a latch housing having a housing bore open at the proximal end and extending to a housing bottom wall at the distal end; and

    a pin rod support extending upwardly from the housing bottom wall and having a rod bore formed therein and being open at the proximal end;

    a hollow housing sleeve mounted over the pin rod support and axially moveable relative thereto, the housing sleeve including a shaft bore formed therethrough;

    a rotatable pin rod shaft axially fixed within the rod bore and extending thereout through the shaft bore, the pin rod shaft having a pin rod dowel extending laterally outwardly from the pin rod shaft at the proximal end; and

    a catch assembly selectively engagable to the latch assembly and including;

    a catch housing having a catch bore open at the proximal end and extending to a catch bottom wall at the distal end;

    a rotatable inner cam having a mating end and a bearing end axially fixed within the catch bore adjacent the proximal end, the mating end having inner cam mating end ramps formed thereon; and

    a rotatable outer cam axially fixed within the catch bore adjacent the housing bottom wall, the outer cam having a bearing end and a mating end with outer cam bearing and mating end ramps being formed respectively thereon, the outer cam mating end ramps including a notch formed therewith, the inner and outer cams being coupled at respective ones of the mating ends such that the inner and outer cams rotate in unison within the catch bore, the inner and outer cam mating ends collectively defining a cam interior, the outer cam having a cam bore and a cam slot extending axially through the outer cam for passage of the pin rod shaft and pin rod dowel therethrough;

    a compression spring captured between the housing bottom wall and the housing sleeve and configured to apply a biasing force to bias the housing sleeve away from the latch housing;

    wherein;

    the inner and outer cam mating end ramps are configured to effectuate incremental rotation of the inner and outer cams relative to the pin rod dowel when the catch assembly is initially axially moved toward and reciprocated relative to the latch assembly such that the pin rod dowel passes through the cam slot, enters the cam interior and engages the notch in order to place the door latch in the latched position;

    the inner and outer cam mating end ramps being configured to effectuate further incremental rotation of the pin rod dowel relative to the inner and outer cams when the catch assembly is further reciprocated relative to the latch assembly such that the pin rod dowel disengages from the notch during withdrawal of the pin rod dowel from the cam interior through the cam slot in order to place the door latch in the unlatched position.

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