Mining or in situ disintegration of hard material – Expansible breaking-down devices – Wedge
Patent
1978-04-27
1980-02-26
Purser, Ernest R.
Mining or in situ disintegration of hard material
Expansible breaking-down devices
Wedge
299 15, 166216, 125 23R, 254104, 85 79, E21C 3702, E21C 3704
Patent
active
041902939
ABSTRACT:
A rock splitting attachment for a breaking hammer comprising a primary shaft and an elongated primary wedge assembly that is telescopically attached to the primary shaft. The primary shaft has a plurality of principal wedge surfaces on its outer surface adjacent its bottom end. The structure for telescopically attaching the primary shaft to the elongated primary wedge assembly comprises a bore in the primary shaft extending axially inwardly from its bottom end and a secondary shaft that forms a part of the elongated primary wedge assembly. The width of the secondary shaft is smaller that the width of the bore so that it may be telescopically received therein. The secondary shaft has an external groove extending axially along a substantial portion of its length. A set screw is threadably seated in the primary shaft so that it extends radially inwardly far enough into the primary shaft that it extends into the external groove of the secondary shaft. The external groove is closed at its top end to prevent the secondary shaft from being pulled out of the bore of the primary shaft. The secondary shaft has a plurality of arms extending laterally from its lower end. The primary wedge assembly has a plurality of leg members each having a laterally oriented bore adjacent its lower end and each has one of the laterally extending arms of the secondary shaft received in its bore. The leg members have principal wedge surfaces on their inwardly facing sides.
REFERENCES:
patent: 1407719 (1922-02-01), Boner
patent: 2328661 (1943-09-01), Maloney
patent: 2430524 (1947-11-01), Miller
Logan II Charles C.
Nichols Jr. Nick A.
Purser Ernest R.
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