Title: Resilient guide bushing mounting for blast hole drills or the like

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.

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Inventors: Learmont, Tom (Wauwatosa, WI, US)
Nelmark, Jack D. (New Berlin, WI, US)
Martin, Gary E. (South Milwaukee, WI, US)
Raske, Theodore F. (Germantown, WI, US)

Application Number: 553441
Filing Date: 1975-02-26
Publication_date: 1976-03-16
Assignee: Bucyrus-Erie Company (South Milwaukee, WI)
Primary Class(es): 384/29 173/164, 175/220, 384/37
Other Classes:
US Patent Ref:

2386281	Oct, 1945	Watson	308/4.
3194611	Jul, 1965	Mahony	308/4.
3833070	Sep, 1974	Anderson	308/4.

Other Refs:
Primary Examiner: Wood, Jr., M. H.
Assistant Examiner: Church, Gene A.
Attorney: Quarles & Brady