1975-02-06
1976-12-21
Gilliam, Paul R.
E21D 904
Patent
active
039980669
ABSTRACT:
A shield comprises a knife ring with vertical and horizontal partition knives disposed therein for breaking rock. The horizontal partition knives are pivotally connected to the horizontal platforms, adapted to turn in the vertical plane.
Each platform is spring-loaded so that when broken rock is loaded on the platform, the latter, under the weight of the rock, tilts downwardly in the vertical plane, and as the surplus rock is being unloaded, the same spring force returns the platform to the initial position.
REFERENCES:
patent: 3431737 (1969-03-01), Bower
patent: 3558192 (1971-01-01), Shmakov et al.
Evdokimenkov Nikolai Pavlovich
Fishman Josif Davydovich
Gapanovich Jury Matveevich
Gergokov Izmail Makhmudovich
Khalyavkin Mikhail Dmitrievich
Corbin David H.
Gilliam Paul R.
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