Mortise lock with dual reverse/lockout mechanism
A mortise lock incorporating a modular powerpack with dual independent return mechanisms, one for the inside operator and one for the outside, using linear springs, and with a lockout feature for selective “locking out” of the return mechanisms to accommodate external operators with built-in powerpacks.
1. A mortise lock, comprising:
a housing;
a latch bolt slideably retractable into said housing;
a latch actuator assembly including
a first latch actuator mounted within said housing for rotation about a first axis and keyed to an outer door operator for translating rotary motion of said outer door operator from a rest position into linear retraction of said latch bolt, and
a second latch actuator mounted within said housing for rotation about said first axis and keyed to an inner door operator for translating rotary motion of said inner door operator from a rest position into linear retraction of said latch bolt; and
a powerpack engaged to said latch actuator assembly for biasing said inner and outer door operators back to said rest positions, said powerpack further comprising,
a first pinion engageable with said first latch actuator and rotatably mounted in said housing on a second axis for rotation between a first position in which said outer door operator is in said rest position and a second position in which said outer door operator is displaced from said rest position sufficiently to retract said latch bolt,
a first spring engaged to said first pinion for biasing said first pinion toward said first position, and
a first pinion catch offset from said second axis for engaging said first latch actuator, and
a second pinion engageable with said second latch actuator, said second pinion being rotatably mounted in said housing coaxial with said first pinion for rotation between a first position in which said inner door operator is in said rest position and a second position in which said inner door operator is displaced from said rest position to retract said latch bolt,
a second spring engaged to said second pinion for biasing said second pinion toward said first position, and
a second pinion catch offset from said second axis for engaging said second latch actuator.
2. The mortise lock according to claim 1 , wherein said first latch actuator and second latch actuator each comprise a cog for engaging said first and second pinion catch, respectively.
3. The mortise lock according to claim 1 , wherein said springs are linear springs.
4. The mortise lock according to claim 3 , wherein said linear springs are seated in an adjustable-position spring shoe for varying spring-bias.
5. The mortise lock according to claim 1 , wherein said first pinion and second pinion both comprise an identical pinion.
6. The mortise lock according to claim 5 , wherein said pinions both comprise an eccentric disk.
7. The mortise lock according to claim 6 , wherein said pinions both comprise an upper disk plate, a lower disk plate, and an intermediate member.
8. The mortise lock according to claim 7 , wherein said pinions both comprise a catch post for engaging the cogs of said first latch actuator and second latch actuator.
9. The mortise lock according to claim 1 , wherein said first and second pinions each comprise a lockout mechanism by which said first pinion and second pinion are selectively retained in said second position.
10. The mortise lock according to claim 9 , wherein said lockout mechanism comprises
a first hole in said pinion and a second hole in said housing, said first and second holes in cooperative alignment when said pinion is in said second position and a pin selectively inserted through said first and second holes to prevent pivoting of said pinions from said second position.
11. The mortise lock according to claim 9 , wherein each said lockout mechanism comprises an engagement with said housing.