Manually and electrically commanded automatic hooklock

Claim 1

An electrically and manually operable lock mechanism for a sliding gate comprising: a casing adapted for attachment to a sliding gate and including a bearing flange having an opening therethrough adapted to be aligned with a similar opening in a lock plate on a gate post as a gate having said lock mechanism attached thereto is closed against the gatepost; a hook member pivotably mounted within said casing and extending through the bearing flange opening, with an inclined surface adapted to act upon an edge of the lock plate opening to pivotably raise said hook member as the sliding gate is closing against the gate post and to lower said hook member when the gate is fully closed, with said hook member then being hooked on the lock plate; a first lever pivotably mounted within said casing and including a portion engaging said hook member to pivot said first lever in a first direction as said hook member is raised; means for pivotably biasing said first lever in a second direction opposite the first direction to retain said first lever engaging portion in engagement with said hook member; a rod member slidably mounted within said casing; first moving means responsive to the closing of said lock mechanism against the lock plate as the sliding gate is closing against the gate post for moving said slidably mounted rod member to a first position; latching means responsive to said slidably mounted rod assuming its first position for latching said first lever in a latched position with said engaging portion acting against said hook member to prevent raising of said hook member; a blocking plate member movably mounted within said casing for movement between a first position and a second position; means for biasing said blocking plate member to its first position; electrical actuation means for moving said blocking plate member to its second position; key operated manual actuation means for moving said blocking plate member to its second position; second moving means responsive to movement of said blocking plate member to its second position for moving said latching means to release said first lever from the latched position and for pivotably raising said hook member to permit withdrawal of said hook member from the locking plate opening and sliding opening of the sliding gate; and third moving means responsive to movement of said lock mechanism away from the lock plate as the sliding gate is opening for moving said slidably mounted rod member to a second position and for releasing said hook member to permit said hook member to be freely raised and lowered.