Patent ID: 6733050
Filing Date: 2004-05-11
Classification: E05B,Y10T

Abstract:
An improved bolt dock for a door lock comprising an upper bolt set and a lower bolt set covered by a lid to couple with an inner handle and an outer handle to be installed on a door, wherein:the bolt dock has a casing which has a face plate and a guard plate located on one side thereof, the face plate and the guard plate having respectively a plurality of fastening holes located on an upper side and a lower side thereof, and an upper bolt opening and a lower bolt opening, the bolt dock also has a plurality of struts and a plurality of axle holes located in the interior, each strut having a screw hole formed therein, the bolt dock further has a guide rail located at a lower section below the center thereof and a retaining plate located on an upper section of the center of the bolt dock corresponding to the upper bolt opening; the lid corresponds to the bolt dock and has a plurality of axle holes and a plurality of apertures corresponding to the struts of the bolt dock to receive screws for fastening, the lid also has a transverse slide flute formed on one side in the center thereof; the upper bolt set includes: an upper bolt for running through the upper bolt openings having a sloped surface on one side and a fastening section extending from another side thereof; a slide shank having one side extending to form a ram head, another side forming a wedge trough to couple with the fastening section of the upper bolt, a longitudinal trough formed on an inner side of the wedge trough and a transverse trough normal to the longitudinal trough in a staggered manner, the transverse trough having one end to receive the retaining plate of the bolt dock to form a retaining position and housing a spring, the longitudinal trough being covered by a cover plate which is fixedly fastened by rivets running through two round holes formed on the cover plate; an axle member having a hollow barrel with a square opening formed therein, an upper bucking arm extending upwards and a lower bucking arm extending downwards; a trigger plate formed in an arched shape having an axle hole on one end to couple with one end of an axle and a bucking flap located on another end and bent downwards to press an inner rim of the ram head of the slide shank; a trigger plate formed in an arched shape having an axle hole on one end to couple with one end of an axle and a bucking flap located on another end and bent downwards to press an inner rim of the ram head of the slide shank; and a swing plate having one side extended to form an elongated arm with a tip to press against a side wall of the slide shank to form a brake; and the lower bolt set includes: a lower bolt for running through the lower bolt openings having one side formed a sloped surface and another side extending rearwards to form a stem for coupling with a spring, the stem having a groove; a slide member coupling on the guide rail of the bolt dock and having a semicircular trough formed on a front section at the right side to house the stem of the lower bolt and the spring and a wedge plate, and another semicircular trough formed on a rear section to house another spring, the slide member further has a ridge formed on a left side to couple with the slide flute of the lid for moving horizontally within a limited distance, the slide member also has a retaining axle located on an upper side thereof; a push arm having one end formed an axle hole to couple with the strut of the bolt dock and another end formed a cavity to hold one end of a spring, the cavity being coupled with the guide rail of the bolt dock and having one side with a trough formed thereon to hold one end of a the torsional spring; a rocker plate formed in a hook shape having an axle hole on a corner section and a notch, the axle hole being coupled with a pintle which is located between the bolt dock and the lid and being coupled with the axle holes formed thereon; and a wedge plate having a notch formed on one side to clip the groove of the stem of the lower bolt and a bent flap on another side to latch on the slide member; wherein the upper bolt and the lower bolt lock the door automatically when closed and are free from deformation.