Title: Boring apparatus

Abstract: In boring apparatus of the type having cutters mounted for rotation about respective cutter axes in a frame which is in turn rotatable about a frame axis, each cutter having a body carrying teeth which in operation sweep a surface which is oblique to the axis of advance of the apparatus, that improvement wherein each cutter has selected tooth regions, preferably of alternating high and low tooth densities, spaced along the respective cutter axis, the tooth regions of the cutters are arranged in an ordered cycle progressing along the frame axis, and regions adjacent each other in the cycle are on different cutters and overlap each other along the frame axis.

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Inventors: Peterson, Carl R. (Boxford, MA, US)

Application Number: 506021
Filing Date: 1974-09-16
Publication_date: 1976-03-23
Assignee: Rapidex, Inc. (Gloucester, MA)
Primary Class(es): 175/349 175/334, 175/337, 175/345, 175/376, 175/378
Other Classes:
US Patent Ref:

930758	Aug, 1909	Hughes	175/353.
1302058	Apr, 1919	Layne	175/345.
2029770	Feb, 1936	Grant	175/346.
2093603	Sep, 1937	Ellingsen	175/347.
2122863	Jul, 1938	Howard et al.	175/377.
2126145	Aug, 1938	Smith	175/346.
2499630	Mar, 1950	Clark	175/346.
2915291	Dec, 1959	Gulfelt	175/348.
3018835	Jan, 1962	Kucera	175/378.
3306379	Feb, 1967	Kloesel et al.	175/345.
3306381	Feb, 1967	Garrett et al.	175/346.
3419093	Dec, 1968	Lichte et al.	175/376.
3726350	Apr, 1973	Pessier	175/378.
3805901	Apr, 1974	Coski	175/344.
3820613	Jun, 1974	White	175/345.
R27781	Oct, 1973	Garrett	175/345.

Other Refs:
Primary Examiner: Brown, David H.
Assistant Examiner:
Attorney: