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Primary Examiner: Pate, III, William F.
Assistant Examiner:
Attorney: Wray; James C.

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Title: Rock cutting tip inserts

Abstract: The rock cutting tip insert of a rock cutting tool comprises two layers, the front layer being harder than the backing or base layer by at least one hundred units on the Vickers Hardness scale.


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Inventors: Kenny, Peter (Lichfield, GB)
Johnson, Stanley N. (Lichfield, GB)

Application Number: 564640
Filing Date: 1975-04-02
Publication_date: 1980-03-25
Assignee: Coal Industry (Patents) Ltd. (London, GB2)
Primary Class(es): 299/112R 51/309, 76/DIG11, 407/118
Other Classes:
US Patent Ref:
1965950Jul, 1934Walker299/79.
2033594Mar, 1936Stoody299/79.
2201159May, 1940Clow175/409.
3010709Nov, 1961Bentley et al.299/79.
3127945Apr, 1964Bridwell et al.175/410.
3260579Jul, 1966Scales et al.29/196.
3368882Feb, 1968Ellis et al.29/196.
3790353Feb, 1974Jackson51/309.
3869319Mar, 1975Ishihara29/196.
3888637Jun, 1975Taguchi et al.37/142.
3932952Jan, 1976Helton et al.175/410.

Other Refs: Other References: All Carbide Boring Bar, American Machinist, May 23, 1946, p. 115, H. E. York.