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. 17, 1990
Filed:
Mar. 28, 1989
Elmar Maier, Feldkirch-Tisis, AT;
Hilti Aktiengesellschaft, Furstentum, LI;
Abstract
A drilling device is made up of a hollow cylindrical retainer and an annular drill bit. One of the retainer and drill bit has recesses for receiving projections on the other so that the two parts can be detachably connected together. Each recess has a first and a second axially extending section with the second section extending circumferentially from the opposite axially extending sides of the first section. Accordingly, the second section forms stop shoulders extending transversely of the axial direction for contacting circumferentially extending edges of the projections. As a result, the retainer can transmit rotary motion to the drill bit in both rotational directions while maintaining the two parts in connected engagement.