Power-operated window lock

A power-operated locking mechanism for locking a swingable window sash in a tightly closed position against a jamb of a window frame and selectively operable to release the sash for swinging to an open position, said locking mechanism comprising, in combination, a strike mountable on the sash, a lock unit mountable on the frame adjacent the jamb, said lock unit comprising a base, a slide having inner and outer ends, said slide being mounted on said base to move linearly outwardly toward said sash from a first position to a second position and to move linearly inwardly away from said sash from said second position to said first position, a latching bolt mounted on said slide to pivot relative to the slide between a latched position in which said bolt engages said strike and an unlatched position in which said bolt releases said strike, resiliently yieldable means for urging said bolt to pivot toward said unlatched position, an electrically energized reversible actuator, means connecting said actuator to said slide and operable to move said slide outwardly from said first position toward said second position in response to operation of said actuator in one direction, said connecting means being operable to move said slide inwardly toward said first position in response to operation of said actuator in an opposite direction, and means on said base for holding said bolt in said latched position during initial outward movement of said slide from said first position and for releasing said bolt for pivoting toward said unlatched position as said slide approaches said second position, said holding means camming said bolt back toward said latched position during inward movement of said slide from said second position and maintaining said bolt in said latched position as said slide completes its inward movement to said first position.

A power-operated locking mechanism for locking a swingable window sash in a tightly closed position against a jamb of a window frame and selectively operable to release the sash for swinging to open position, said locking mechanism comprising a strike mountable on said sash, a lock unit mountable on said frame adjacent the jamb, said lock unit comprising a base, a slide having inner and outer ends, said slide being mounted on said base to move linearly outwardly toward said sash from a first position to a second position and to move linearly away from said sash from said second position to said first position, a generally U-shaped latching bolt having inner and outer legs, means mounting said bolt on said slide to pivot relative to the slide between a latched position in which the outer leg of said bolt hooks within said strike and an unlatched position in which the bolt releases the strike, resiliently yieldable means for urging said bolt to pivot toward said unlatched position, a reversible electric motor having rotary output shaft, a crank pin, means connecting said output shaft to said crank pin and operable to cause said crank pin to oscillate back and forth in an arc when said shaft is rotated first in one direction and then in an opposite direction, an opening in said slide and recieving said crank pin, said opening having inner and outer edges, said crank pin engaging the outer edge of said opening and moving said slide outwardly toward said second position when said output shaft is rotated in one direction, said crank pin engaging the inner edge of said opening and moving said slide inwardly toward said first position when said output shaft is rotated in the opposite direction, means on the outer end of said slide for engaging said strike and pushing said strike outwardly during outward movement of said slide, means on said base for holding said bolt in its latched position during initial outward movement of said slide from said first position and for releasing said bolt for pivoting to its unlatched position as said slide approaches said second position, the inner and outer edges of said opening being spaced from one another by a distance substantially greater than the diameter of said crank pin so as to permit said slide to move outwardly independently of said crank pin when said strike pulls on the outer leg of said bolt during opening of said sash, said strike engaging the inner leg of said bolt and pushing said slide inwardly during closing of said sash, and said holding means camming said bolt toward its latched position during initial inward movement of said slide and maintaining said bolt in its latched position as said slide completes its inward movement to said first position.