Extensible and retraciable rotor arm cutting assembly

Details Extensible and retraciable rotor arm cutting assembly Extensible and retraciable rotor arm cutting assembly

1980-05-27

1982-02-23

Purser, Ernest R.

Mining or in situ disintegration of hard material

Cutter tooth or tooth head

Adjustable head

175267, E21C 2724, E21B 1062

Patent

active

043166350

ABSTRACT:
A rotor arm cutting assembly includes a plurality of cutter arm members extending radially outwardly from a hub portion which is adapted for nonrotatable connection to a drive shaft extending from the front of a mining machine. Each cutter arm member includes a front face for supporting cutter bits operable to dislodge solid material from a mine face upon rotation of the drive shaft. A slot extends longitudinally outwardly from the hub portion to the end of each cutter arm member on the front face. A cutter arm extension is positioned for longitudinal movement in the slot. Complimentary guide members and guide ways associated with the extension portion and the cutter arm member maintain the extension portion movable in a longitudinal direction in the slot. The extension portion is extended and retracted relative to the cutter arm member by operation of a fluid actuated cylinder positioned for convenient servicing within a recess in the back of the cutter arm member. The extension portion also supports cutter bits so that extension thereof from the end of the cutter arm member extends the effective cutting length of the cutter arm member.

REFERENCES:
patent: 2801094 (1957-07-01), Ball
patent: 2836407 (1958-05-01), Tracy et al.
patent: 2890033 (1959-06-01), Silks
patent: 2937859 (1960-05-01), Jackson
patent: 2998964 (1961-09-01), Morlan
patent: 3278237 (1966-10-01), Karlovsky et al.
patent: 3278238 (1966-10-01), Karlovsky et al.
patent: 3294450 (1966-12-01), Karlovsky
patent: 3309143 (1967-03-01), Karlovsky et al.
patent: 3309144 (1967-03-01), Karlovsky
patent: 3350137 (1967-10-01), Karlovsky
patent: 3376072 (1968-04-01), Karlovsky

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