Window sash latch
AssigneeVision Industries Group, Inc.
InventorsLuke Liang, Tong Liang, David Chen
Life of this patent
Estimating the term…
Abstract
An improved window sash latch which has a locking mechanism and a keeper is provided with a handle that rotates from a “locked” to an “unlocked” position. An inner cavity of the handle has a spring assembly having a sliding part that can be forced into a detent as the handle slides around a cylindrical extension of an outer surface of the latch. The detents correspond to a “locked” and an “unlocked” position of the latch. The latch also provides two cams where both cams revolve relative to each other; one cam is activated by the handle through the handle's shaft, the other cam engages the keeper, and both cams engage each other.
Claims25
A latch, for use in releasably securing at least one sliding sash window relative to a window frame wherein a portion of said latch engages a keeper located on the window frame or on a second sash member, said latch comprising:
- a housing having an orifice thereon;
- a locking mechanism, said locking mechanism comprising a manually graspable handle protruding from a shaft, a first cam, and a second cam;
- said second cam comprising an oblong opening, said shaft passing through said oblong opening of said second cam to permit relative motion therebetween, and said first cam being secured to said shaft;
- said shaft being mounted using said housing orifice;
- said second cam selectively driving motion of said first cam;
- wherein when said locking mechanism is in a first locking mechanism position comprising an unlocked position, said selectively driven motion comprises said first cam rotating to a second locking mechanism position while a portion of said first cam selectively engages a portion of said second cam to thereby drive said second cam to co-rotate to have a second portion of said second cam protrude out from said housing, said protruding portion comprising a slot therein;
- wherein when said first cam continues to rotate from said second locking mechanism position to a third locking mechanism position comprising a locked position, said continued rotation being without rotation of said second cam, said continued rotation of said first cam driving translation of said second cam wherein a recess therein engages a protrusion in said housing to thereby lock said second cam with respect to said housing in said locked position;
- and
- wherein when said first cam continues to rotate from said third locking mechanism position to a fourth locking mechanism position, said continued rotation being without rotation or translation of said second cam.
A window latch, for use in releasably securing at least one sliding sash window relative to a window frame wherein a portion of said latch engages a keeper located on the window frame or on a second sash member, said latch comprising:
- a housing, said housing comprising a cavity and an orifice, said housing comprising a locking protrusion extending inward into said cavity from a wall of said housing;
- a shaft with a graspable handle, a portion of said shaft being mounted through said orifice in said housing;
- a delay cam, said delay cam being mounted to said shaft within said housing cavity;
- a second cam, said second cam having an oblong orifice usable to position said second cam on said shaft within said housing cavity;
- and
- wherein upon rotation of said shaft, said delay cam rotates and a portion of said delay cam engages a portion of said second cam to drive said second cam to selectively travel from an unlocked position into a locked position against said locking protrusion, with a second portion of said second cam protruding out of said housing cavity, said protruding second portion of said second cam having a slot therein;
- said delay cam thereafter continuing to rotate to have said portion of said delay cam disengage from causing said rotation of said second cam and thereafter rotate within a curved recess in said second cam, to be in a closed position, with a detent releasably securing said delay cam at said closed position, wherein a radius of said curved recess in said second cam gradually changes;
- and wherein when said second cam reaches said locked position against said locking protrusion, said independent rotation of said delay cam is by said portion of said delay cam rotating freely within said curved recess without causing further translation of said second cam.
Dependencies are inferred from the claim text.