Mining or in situ disintegration of hard material – Miscellaneous
Patent
1988-12-16
1990-01-16
Kisliuk, Bruce M.
Mining or in situ disintegration of hard material
Miscellaneous
299 86, 175411, 172745, E21C 3518
Patent
active
048938750
ABSTRACT:
Ground engaging bits having hardned tips are beneficial when working extremely hard ground and/or planing asphalt or concreate. In these applications, the ground engaging bits rotate in their holders while performing the cutting action. Since the material needed to make a hardened tip is normally very expensive, it is beneficial to best utilize all, or at least most of, the hardened tip and to provide a hardened top that remains sharp during its effective life. The present ground engaging bit has a body with a convex non-linear forward end surface and a hardened tip with a corresponding concave non-linear rearward end surface to mate with the forward end surface of the body. The hardened tip has a continuous concave surface of revolution defined on its intermediate portion with a radius thereof being less than the diameter of its rearward flange portion. This arrangement uses less material to form the hardened tip and also provides a bonded surface that during the brazing operation allows the brazing material to freely flow evenly over the interface between the two surfaces. This arrangement provides an effective ground engaging bit that remains sharp during the life of the ground engaging bit while using less material to make the hardened tip.
REFERENCES:
patent: 3331637 (1967-07-01), Krekeler
patent: 3336081 (1967-08-01), Ericsson
patent: 3655244 (1972-04-01), Swisher
patent: 3718370 (1973-02-01), Caserta
patent: 4497520 (1985-02-01), Ojamen
patent: 4725099 (1988-02-01), Penkunas et al.
Caterpillar Inc. Drawings No. 9W6776 entitled BIT AS.-Cutter (Asphalt).
Klett Gene R.
Lonn Alan H.
Burrows J. W.
Caterpillar Inc.
Kisliuk Bruce M.
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