Lock assembly

A lock assembly for a roll-up door which slides in two, oppositely directed tracks, comprising:

• a housing having means for securing said housing to one of the tracks;
• a locking bolt slidably mounted in said housing for axial movement between locking and unlocked positions, said bolt having a radially projecting shoulder on an outer surface thereof between inner and outer ends of said bolt and a head portion and a body portion which are releasably coupled, said head and body portions being releasably coupled by a shear pin;
• spring means, engaging said housing and said bolt, for biasing said bolt toward said unlocked position;
• and
• lug means movably mounted in said housing between a first position engaging said bolt shoulder for retaining said bolt in said locking position, and a second position disengaged from said bolt shoulder for releasing said bolt for axial movement in said housing.

A lock assembly for a roll-up door which slides in two, oppositely directed tracks, comprising:

• a housing having means for securing said housing to one of the tracks;
• a locking bolt slidably mounted in said housing for axial movement between locking and unlocked positions, said bolt having a radially projecting shoulder on an outer surface thereof between inner and outer ends of said bolt and a camming surface extending from said shoulder and tapering toward said inner end and in the direction of a locking bolt movement from said unlocked position to said locking position, said shoulder defining one side of a recess in said locking bolt, said locking bolt having a width at said recess substantially equal to a width of said locking bolt between said camming surface and said inner end;
• spring means, engaging said housing and said bolt, for biasing said bolt toward said unlocked position;
• and
• lug means spaced outwardly of and adjacent said spring means when said bolt is in said unlocked position and movably mounted in said housing between a first position engaging said bolt shoulder and received in said recess for retaining said bolt in said locking position, and a second position disengaged from said bolt shoulder for releasing said bolt for axial movement of said housing;
• whereby said camming surface forces said lug means to said second position permitting movement of said bolt to said locking position.

A gate lockiing system, comprising:

• opposed channeled guide tracks, at least one of said tracks having a hole therethrough;
• a gate movable within said tracks between open and closed positions, said gate having at least one aperture therethrough aligned with said track hole when said gate is in said closed position;
• and
• a lock assembly mounted on said one track over said hole, said lock assembly including
• a housing fixedly secured to said one track,
• a locking bolt slidably mounted in said housing for axial movement between a locking position in which an inner end of said locking bolt extends through said track hole and gate aperture and an unlocked position removed from said track hole and gate aperture, said bolt having a radially projecting shoulder or an outer surface thereof between inner and outer ends of said bolt, said bolt having a flange extending radially from said inner end, whereby said bolt inner end can pass through said track hole, but will engage said track upon attempting to withdraw said bolt by bending said track, said flange and said track hole having substantially equal transverse dimensions,
• spring means, engaging said housing and said bolt, for biasing said bolt toward said unlocked position, and
• lug means movably mounted in said housing between a first position engaging said bolt shoulder for retaining said bolt in said locking position, and a second position disengaged from said bolt shoulder for releasing said bolt for axial movement in said housing.