Door lock

Claim 1

In locks of the class having a lock barrel which is adapted to extend into a throughhole in a door in fixed relation therewith, a lock cylinder in the lock barrel providing a through key slot, keeper pin, tumbler and follower pin means operable by the insertion of a proper key in the key slot to permit rotational movement of the lock cylinder within the lock barrel, the improvement comprising in combination, A. a bolt actuating bar, extending axially inwardly from the inner end of the lock cylinder, having 1. an enlarged head portion at one end thereof, a first portion of which is sized to be slidably received in the inner end portion of the key slot, 2. lock lug means, forming a second portion of said enlarged head portion, positioned outside of the key slot and extending radially outwardly beyond the lock cylinder; B. notch means in the fixed lock barrel sized and positioned to receive said lock lug means; C. compression spring means to hold said lock lug means in said notch means when the proper key is not inserted in the key slot, said compression spring means being yieldable inwardly upon full insertion of a proper key, the tip portion of which engages said head portion to move said bolt actuating bar inwardly a distance sufficient to disengage said lock lug means from said notch means to permit rotational movement of the lock cylinder and said bolt actuating bar upon manipulation of the key.