Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1980-09-23
1982-09-21
Kunin, Stephen G.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
408 10, 408130, E21C 510
Patent
active
043502121
ABSTRACT:
A drilling machine comprises a quill, pneumatic cylinder for reciprocating the quill in the forward and backward direction, a feed control device which includes a liquid cylinder parallelly disposed to the quill and provided with a piston assembly with a projecting portion engageable with the quill for controlling the advancing speed of the quill, one-way clutch for allowing the piston assembly only the forward movement thereof by engaging with the projecting portion of the piston assembly, and an operation control device for repeatedly reciprocating the quill. The quill is advanced firstly at a rapid speed; upon engaging with the projecting portion of the piston assembly, the quill is advanced at a regulated speed by the liquid cylinder. When the quill has completed several times of reciprocation movement under the control of the operation control device, one working cycle is finished. When the quill assembly has reached the forwardmost position the operation control device is suspended of its controlling function for returning the quill to the original position. Returning of the quill to the original position releases the one-way clutch accompanied by the returning of the projecting portion of the piston assembly with the aid of a return spring.
REFERENCES:
patent: 2692660 (1954-10-01), Good et al.
patent: 2706917 (1955-04-01), Hill
patent: 2854871 (1958-10-01), Stratman
patent: 2857789 (1958-10-01), Robinson
patent: 3155172 (1964-11-01), Kazmm et al.
patent: 3598497 (1971-08-01), Nyman
patent: 3816016 (1974-06-01), Schabzman
Brother Kogyo Kabushiki Kaisha
Kunin Stephen G.
Olszewski Robert P.
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