Patent ID: 8061439
Filing Date: 2011-11-22
Classification: B28D

Abstract:
1. A device for breaking rocks, the device comprising: a hollow mast having an upper end portion and a lower end portion that define a vertical axis, the mast having a channel running at least substantially parallel to the vertical axis; a weight slidably disposed in the channel; a weight raising arrangement for raising and releasing the weight to allow the weight to fall within the channel under the influence of gravity; a recoil arrangement comprising: an isolator arrangement comprising: a nose block secured proximate the lower end portion of the recoil tube, the nose block having an upper surface and a bore formed through the nose block so as to slidably receive a tool therein; and an impact-absorbing recoil buffer disposed within the recoil tube in a space defined between the lower end portion of the mast and the upper surface of the nose block, the recoil buffer being constructed and arranged to resiliently absorb impact forces imparted to the recoil buffer by the weight.