Mining or in situ disintegration of hard material – Expansible breaking-down devices – Wedge
Patent
1978-01-05
1979-09-25
Purser, Ernest R.
Mining or in situ disintegration of hard material
Expansible breaking-down devices
Wedge
299 20, 308239, E21C 3704
Patent
active
041688627
ABSTRACT:
This invention pertains to hydraulically actuated rock splitters which utilize a wedge and feather action. The forward movement of this wedge places a corresponding thrust load on the feathers and their retaining means. Conventionally, the feathers have enlarged portions which are engaged by and are retained by hardened steel thrust or wear plates carried by a shell or housing. As a means of keeping the weight within reasonable limits this housing is usually made of aluminum or an alloy of aluminum. The support for these hardened steel plates, as provided by the housing, is usually insufficient resulting in a cracking or breaking of the hardened steel plates. A lamination of these plates and providing a softer steel backing reduces or eliminates damage to the housing when cracking of the hardened steel plates occurs.
REFERENCES:
patent: 1679772 (1928-08-01), Johnson
patent: 1718229 (1929-06-01), Graham
patent: 2473307 (1949-06-01), Seipt et al.
patent: 2542405 (1951-02-01), Fink
patent: 3762881 (1973-10-01), Dunn
patent: 3957309 (1976-05-01), Darda
patent: 4073427 (1978-02-01), Keifert et al.
Nichols Jr. Nick A.
Purser Ernest R.
Roberts Ralph R.
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