Patent ID: 7063240

Claim:
A caulking gun apparatus configured to support a cartridge and dispense caulk from the cartridge, the apparatus comprising: a body configured to hold the cartridge in a dispensing position, a piston shaft configured to engage the cartridge for dispensing of the caulk, the piston shaft having a plurality of driving levers in slidable engagement therewith; a motor means disposed within the body coupled to a motor shaft; and a plurality of cams axially coupled to the motor shaft, at least one cam of the plurality of cams having uneven surfaces in slidable engagement with at least one driving lever of the plurality of driving levers; at least one other cam of the plurality of cams having uneven surfaces in slidable engagement with at least one other driving lever of the plurality of driving levers; each of the uneven surfaces including at least one lifting surface and at least one retrograde surface; the lifting surfaces and the retrograde surfaces being positioned such that during rotation of the motor shaft, power transmission is provided from the motor to the piston shaft by the lifting surfaces, wherein the power is exchanged between the at least one cam and the at least one other cam through the at least one driving lever and the at least one other driving lever within a desired power transmission range.