Patent ID: 7195295

Claim:
A latch driving unit for a door lock comprising: a pin ( 21 ) having a first hole ( 211 ) defined at a first end of the pin ( 21 ), and a second hole ( 212 ) defined at a second end of the pin ( 21 ); a locking disk ( 23 ) provided at the second end of the pin ( 21 ), the locking disk ( 23 ) having an aperture ( 231 ) aligned with the second hole ( 212 ) of the pin ( 21 ), and two teeth ( 232 ) formed at an outer circumference of the locking disk ( 23 ); a resilient member ( 22 ) provided between the pin ( 21 ) and the locking disk ( 23 ), the resilient member ( 22 ) having a portion ( 221 ) abutting the locking disk ( 23 ), and a portion to fasten a strip ( 27 ); a rotatable disk ( 24 ) provided at a side of the locking disk ( 23 ) opposed to the resilient member ( 22 ), the rotatable disk ( 24 ) having an orifice ( 241 ) aligned with the aperture ( 231 ) and the second hole ( 212 ), and an ear ( 242 ) formed at an outer circumference of the rotatable disk ( 24 ) and aligned with one of the teeth ( 232 ) of the locking disk ( 23 ); a cap ( 26 ) provided at a side of the rotatable disk ( 24 ) and opposed to the locking disk ( 23 ), the cap ( 26 ) having a chamber ( 261 ) defined at a side facing the rotatable disk ( 24 ) for receiving the rotatable disk ( 24 ), a central opening ( 262 ) defined through the cap ( 26 ), and multiple arcuate slots ( 263 ) defined around the central opening ( 262 ); a torsion spring ( 25 ) provided between the cap ( 26 ) and the rotatable ( 24 ) and received in the chamber ( 261 ), the torsion spring ( 25 ) having two legs ( 251 ) respectively extending over upper and lower edges of the ear ( 242 ) and attached to the corresponding one of the teeth ( 232 ); and the strip ( 27 ) extending sequentially through the central opening ( 262 ), the torsion spring ( 25 ), the orifice ( 241 ), the aperture ( 231 ), the resilient member ( 22 ) and inserted into the second hole ( 212 ) of the pin ( 21 ), the strip ( 27 ) having multiple nicks ( 271 ) defined on a surface of the strip ( 27 ), two bevels ( 272 ) respectively defined at two sides of a front end of the strip ( 27 ), two notches ( 273 ) respectively defined behind the bevels ( 272 ) for positioning the resilient member ( 22 ), and two shoulders ( 274 ) respectively formed behind the notches ( 273 ) and blocked by the cap ( 26 ).