Patent ID: 7090038

Claim:
A bedrock drilling and excavating apparatus, comprising: a coupling device to couple with a rotational power source and an air pressure source for generating vibration; a connector coupling with a lower end of the coupling device and a pneumatic unit; an excavator coupled on an outer side of the pneumatic unit, the excavator having a continuous and helical wing on the periphery thereof; and a drill coupling with the pneumatic unit; wherein the drill includes a drill shell which has a plurality of drill gimlets mounted thereon, the drill shell being alterable according to the drilling diameter without changing the diameter of the pneumatic unit, each of the drill gimlets having a conical end and being mounted onto on the drill shell in a different angle, the coupling device transmitting rotational power from the rotational power source and channeling the air pressure source to the pneumatic unit to allow the drill to generate rotation and longitudinal and reciprocal vibrations to perform downward drilling and excavation; wherein the pneumatic unit includes a cylinder which houses a reciprocal piston, the cylinder receiving compressed air to drive the piston which is moved reciprocally through a returning mechanism to move the drill for generating up and down vibrations.