Side lock for a roll-up door

A side lock for a roll-up door mounted on a body to selectively close an opening, said body having a jamb on either side of said opening, said door having a pair of inverted L-shaped tracks mounted on said jambs in transversely-spaced facing relation to one another, said door having a plurality of panels mounted for guided articulated movement along said tracks between a vertically-disposed position closing said opening and an overhead substantially-horizontal out-of-the-way position permitting access to said body through said opening, said side lock comprising:

• a keeper mounted one of said jambs, said keeper having a catch arranged in spaced relation to said jamb;
• and
• a hook member pivotally mounted on one of said panels for selective engagement with said catch, said hook member having a leg portion extending away from said pivotal axis and having a hook portion extending away from said leg portion and terminating in a tip, said hook member being biased to rotate relative to said one panel about said pivotal axis in one angular direction such that said leg portion is continuously urged to move toward said catch, said hook portion having a lower cam surface adapted to engage said catch when said door is moved toward said closed position for causing said hook member to rotate about said axis in the opposite angular direction to permit said tip to pass beneath said catch, said hook portion having an upper cam surface arranged to engage said catch surface after said tip portion has passed beneath said catch, said hook member also having a concave surface arranged between said upper cam surface and said leg portion, said upper cam surface and said concave surface being so dimensioned and configured that said catch will be urged to move toward said concave surface during relative vibratory motion between said jamb and panel when said upper cam surface engages said catch.