Insert for rocking drilling bits

- Sandvik AB
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Description

FIG. 1 is a bottom view of an insert for rock drilling bits showing our new design;

FIG. 2 is a right side view thereof;

FIG. 3 is a left side view thereof; and,

FIG. 4 is a top view thereof showing the cutting tip.

The other two sides are not shown as they are identical to the right and left sides as shown.

Referenced Cited
U.S. Patent Documents
D30678 May 1899 Childs
3442342 May 1969 McElya et al.
3858670 January 1975 Ott et al.
4021084 May 3, 1977 Garner
4108260 August 22, 1978 Bozarth
4150728 April 24, 1979 Garner et al.
4185708 January 29, 1980 Pawlik et al.
4254840 March 10, 1981 Shay, Jr.
4334586 June 15, 1982 Schumacher
4593776 June 10, 1986 Salesky et al.
4716976 January 5, 1988 Isakov
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4776413 October 11, 1988 Forsberg
4781770 November 1, 1988 Kar
4823893 April 25, 1989 Cantrel
4867015 September 19, 1989 Kane et al.
5264283 November 23, 1993 Waldenstrom et al.
Patent History
Patent number: D357486
Type: Grant
Filed: Aug 18, 1993
Date of Patent: Apr 18, 1995
Assignee: Sandvik AB (Sandviken)
Inventors: Michael Mattsson (Sandviken), Goran Strand (Sandviken), Stig-.ANG.ke Brolund (Valbo)
Primary Examiner: Alan P. Douglas
Assistant Examiner: Antoine D. Davis
Law Firm: Burns, Doane, Swecker & Mathis
Application Number: 0/11,907
Classifications
Current U.S. Class: Cutting Tool, E.g., Drill Bit, Etc. (D15/139)