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:
Jul. 30, 1996
Filed:
Dec. 05, 1994
Applicant:
Inventors:
Assignee:
Fischerwerke Artur Fischer GmbH & Co. KG, Waldachtal, DE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B23B / ;
U.S. Cl.
CPC ...
408147 ; 408236 ;
Abstract
The drilling device has a radially resilient shaft (3) which allows radial displacement of the drill bit (4) and the drill head (5). The radial displacement can be caused by a vibration device (8), but a self-excited oscillation of the resilient shaft (3) can also provide the desired radial displacement of the drill bit and the drill head. The drill shank (2) has a sleeve-shaped shank extension (17) provided with a damping chamber (18) filled with a damping agent (19) and the resilient shaft (3) is in the damping chamber (18) which is sealed by a radially resilient seal (21) surrounding the resilient shaft (3).