Abstract: A rigid and fragile material drilling machine is provided, its driving means for driving the upper and lower drilling bit approximating the rigid and fragile material includes a control handle; upper and lower rear gears and associated upper and lower first synchronizing wheels, said upper and lower rear gears being engaged with each other; upper and lower first timing chains being wound around said upper and lower first synchronizing wheels and upper and lower second synchronizing wheels, respectively; upper and lower second timing chains being wound around said upper and lower third synchronizing wheels and upper and lower fourth synchronizing wheels, respectively; and drilling rod guiding sleeves, the gear racks thereof being engaged with said the upper and lower front gears, respectively. The rigid and fragile material drilling machine of the present invention, which is simplified in structure with a compact design and low cost, can be conveniently used wherever a power supply is available.

Abstract: A rigid and fragile material drilling machine is provided, its driving means for driving the upper and lower drilling bit approximating the rigid and fragile material includes a control handle; upper and lower rear gears and associated upper and lower first synchronizing wheels, said upper and lower rear gears being engaged with each other; upper and lower first timing chains being wound around said upper and lower first synchronizing wheels and upper and lower second synchronizing wheels, respectively; upper and lower second timing chains being wound around said upper and lower third synchronizing wheels and upper and lower fourth synchronizing wheels, respectively; and drilling rod guiding sleeves, the gear racks thereof being engaged with said the upper and lower front gears, respectively. The rigid and fragile material drilling machine of the present invention, which is simplified in structure with a compact design and low cost, can be conveniently used wherever a power supply is available.