The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 16, 1976
Filed:
Feb. 26, 1975
Tom Learmont, Wauwatosa, WI (US);
Jack D Nelmark, New Berlin, WI (US);
Gary E Martin, South Milwaukee, WI (US);
Theodore F Raske, Germantown, WI (US);
Bucyrus-Erie Company, South Milwaukee, WI (US);
Abstract
The guide bushing of a blast hole drill is resiliently mounted to dampen lateral vibrations of the drill string. The mounting arrangement comprises four pads symmetrically placed about the bushing and restrained against all but radial movement. Each pad includes a radially inner bearing section that bears against the exterior of the bushing, an outer backing section that is radially movable with respect to the bearing section, and a resilient cushion between the two sections. A four-lobed cam ring surrounds and faces the backing sections and is rotated to simultaneously load all the cushions to a selected degree. In the preferred embodiment, the mounting components are in an enclosed housing that defines guide channels for the pad and that can easily be fitted into the deck of a machine.