Craig Bradley Nelson

US Patent:

8061439, Nov 22, 2011

Filed:

Oct 16, 2007

Appl. No.:

11/873067

Inventors:

Craig Nelson - Luck WI, US

International Classification:

B25D 17/24

US Classification:

173210, 1731621, 173128

Abstract:

A rock breaking device employs a falling weight and a striker pin or other tool held within a tool holding structure supported by a recoil assembly includes a number of isolator structures that protect the rock breaking device by absorbing excess forces that may be applied to the recoil assembly. Each isolator structure includes a front plate that extends below a lower side of a recoil tube flange. In new rock breaking devices, the front plates may be incorporated as part of the isolator structures. Alternatively, an existing rock breaking device can be retrofitted by welding a heavy plate onto the front of an existing front plate of the isolator structures. The heavy plate extends beyond the lower side of the recoil tube flange to provide greater strength.

US Patent:

62573527, Jul 10, 2001

Filed:

Nov 6, 1999

Appl. No.:

9/435400

Inventors:

Craig Nelson - Luck WI

International Classification:

B25D 1724

US Classification:

173211

Abstract:

A device for breaking rocks comprising a substantially vertical guide column which houses a weight for delivering an impact to a tool held within a cushioned tool holding structure that is itself supported from the guide column by a resilient recoil assembly is herein disclosed.