Rigid and fragile material drilling machine

A rigid and fragile material drilling machine, characterized in that driving means for driving the upper and lower drilling bits on opposite sides of the rigid and fragile material includes

• a control handle (2) being able to be operated to turn around;
• upper and lower rear gears and associated upper and lower first synchronizing wheels (17,18;10,11), said upper and lower rear gears (17,18) being coaxially connected to said associated tipper and lower first synchronizing wheels (10,11), one of said upper and lower first synchronizing wheels (10,11) being driven to rotate by means of said control handle (2), said upper and lower rear gears (17,18) being engaged with each other, and the radii of said upper and lower rear gears (17,18) being greater than those of said upper and lower first synchronizing wheels (10,11);
• upper and lower second synchronizing wheels (8,12) and upper and lower third synchronizing wheels (9,13), being provided above and below said upper and lower rear gears and associated upper and lower first synchronizing wheels (17,18;10,11), respectively, and said upper and lower second synchronizing wheels (8,12) and said upper and lower third synchronizing wheels (9,13) being coaxially connected with each other respectively;
• upper and lower first timing chains (31,32), being wound around said upper and lower first synchronizing wheels (10,11) and upper and lower second synchronizing wheels (8,12), respectively;
• upper and lower fourth synchronizing wheels and upper and tower front gears (7,14,5,6), being provided on one side of said upper and lower second synchronizing wheels (8,12) and said upper and lower third synchronizing wheels (9,13), said upper and lower fourth synchronizing wheels (7,14) and said upper and lower front gears (5,6) being coaxially connected with each other, respectively, and the radii of said upper and lower fourth synchronizing wheels (7,14) being less than those of said upper and lower front gears (5,6), respectively;
• upper and lower second timing chains (30,33), being wound around said upper and lower third synchronizing wheels (9,13) and upper and lower fourth synchronizing wheels (7,14), respectively;
• and
• drilling rod guiding sleeves (3,4), gear racks thereof being engaged with said upper and lower front gears (5,6), respectively.