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:
Nov. 02, 2004
Filed:
Mar. 20, 2003
Leland H. Lyon, Roanoke, VA (US);
Richard K. Smith, Jr., Otley, IA (US);
Atlas Copco AB, Fagersta, SE;
Abstract
A retainer device ( ) is provided for retaining a drill bit ( ) within a percussive drill assembly casing ( ). The retainer device ( ) includes a generally annular body ( ) having a central axis and an inner circumferential shoulder portion ( ) disposable within the casing ( ) such that the body axis ( ) is substantially collinear with a casing axis ( ). The shoulder ( ) is deflectable between a first position (P ), where the shoulder ( ) is contactable with the bit head ( ) to retain the bit ( ) within the retainer body ( ), and a second position (P ). The second position (P ) is spaced radially outwardly from the first position such that the bit head ( ) is displaceable through the body ( ) in a direction along the casing axis ( ). Also, the retainer device ( ) includes a spacer ( ) that locates the retainer body ( ) at a desired axial position within the casing ( ) and a centralizer ( ) that centers the body ( ) about the casing axis ( ).