Door-lock apparatus

A door-lock apparatus comprising:

• a thumb-turn gear comprising a gear part formed on a circumference thereof and configured to be rotated by driving motors;
• a shaft holder configured to be rotated by the thumb-turn gear to lock or unlock a lockset;
• and
• a shaft connected with the shaft holder to be interlocked with the shaft holder,
• wherein the driving motors are respectively arranged at opposite sides with respect to a center of the thumb-turn gear to increase a rotating force of the thumb-turn gear, and are gear-engaged with the gear part of the thumb-turn gear.

A door-lock apparatus comprising:

• a thumb-turn gear comprising a gear part formed on a circumference thereof and configured to be rotated by driving motors;
• a thumb-turn knob configured to be rotated by the thumb-turn gear to lock or unlock a lockset;
• a shaft holder connected to the thumb-turn knob;
• and
• a shaft connected with the shaft holder so as to be interlocked with the shaft holder t,
• wherein the driving motors are respectively arranged at opposite positions with respect to a center of the thumb-turn gear to increase a rotating force of the thumb-turn gear, and are gear-engaged with the gear part of the thumb-turn gear.

A door-lock apparatus comprising:

• a thumb-turn gear comprising a gear part formed on a circumference thereof, and configured to be rotated by driving motors;
• a thumb-turn knob configured to be rotated by the thumb-turn gear or a manual operation to lock or unlock a lockset;
• and
• a shaft connected with the thumb-turn knob to be interlocked with the thumb-turn knob,
• wherein the driving motors are respectively arranged at opposite ends with respect to a center of the thumb-turn gear to increase a rotating force of the thumb-turn gear, and are gear-engaged with the gear part of the thumb-turn gear.