Patent ID: 8960325
Filing Date: 2015-02-24
Classification: B23B,E21B

Abstract:
1. A free-mass, said free-mass having a geometry configured to receive momentum from a horn portion of an ultrasonic percussive device when present in said ultrasonic percussive device and to transmit momentum to a bit portion of said ultrasonic percussive device when present in said ultrasonic percussive device without exceeding stress and material deformation parameters of said bit portion, said free-mass or said horn portion, said free-mass having a geometry comprising at least one of a rounded profile and a chamfer configured to reduce jamming of said free-mass when present in said ultrasonic percussive device as it moves from a position of contact with one of said horn portion and said bit portion to a position of contact with the other of said horn portion and said bit portion.