NZ724779A - Percussion device - Google Patents

Abstract

A variety of materials can be difficult to drill, or because of their variable composition cause a drill to slow or jam. One method of overcoming this is to apply a percussive action, but, in most cases this can require the feeding of fluids to complex valve networks and in many cases careful operator management. The present invention is a device that imparts a percussive force to a tool when that tool meets resistance to rotation, if the resistance continues this percussive force can be periodically applied. Specific applications include rock drills used to drill into the ground and small drills used to drill concrete and the like where variations in the material being drilled can slow or stall the drill; and pile drivers. More particularly the invention is a percussion device that includes: - an input side; - an output side; - at least one drive transmitter; - a drive transmitter pathway; - a percussion impactor; and - a percussion anvil; wherein: - when in use, and the output side is free to rotate, the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to transfer the rotational motion of the input side to the output side; and - when in use and limited or no rotation of the output side is possible, the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to increase, maintain or decrease the distance between the percussion impactor and the percussion anvil; such that the at least one drive transmitter and the drive transmitter pathway are configured to act co-operatively to accept rotational motion from the input side and transmit a percussive and/or rotational motion to the output side.