Patent ID: 7316139

Claim:
A button-operated lock, comprising: a plurality of control buttons axially displaced and capable of setting or inputting a predetermined information; a control plate for allowing an unlocking procedure at the time of setting or inputting the predetermined information by said control buttons; a driving cam linked to said control plate and capable of being operatively connected to a pair of door handles; a lock element linked to said driving cam; and a control means for linking the information to be set or inputted with the number of control by said control buttons; said control means having a button gear, intermittently rotatable for each of said control buttons, capable of setting or inputting said plurality of same or different information, and capable of setting or inputting said plurality of information for said control buttons, wherein; said button gear is coaxially arranged with said control buttons, said button gear and said control buttons are engaged with each other and provided so as to coaxially move, said control means has a gear train in which said button gear includes a plurality of teeth on an outer periphery, said control means has a terminal gear and a reset gear of engaged with each other, the shaft cores of the gears are arranged with space there between in a direction perpendicular to the shaft cores, and the teeth of the gears are arranged roughly in the same plane-shape, said terminal gear arranged to be engageable with said button gear, and the reset gear arranged to be engageable with said terminal gear, said reset gear is biased in such a manner as to be able to rotationally return in accordance with a rotation angle displacement thereof, said terminal gear is provided with an engagement hole engageable with an engagement shaft and having a flat polygonal cross-section, a clutch shaft being provided with an engagement hole engageable with the engagement shaft and having a flat polygonal cross-section which is engageable with and disengageable from said engagement hole, and said engagement shaft being biased for engagement with said engagement hole.