Tool driving or impacting – Automatic control of power operated means
Patent
1993-04-26
1994-11-01
Smith, Scott
Tool driving or impacting
Automatic control of power operated means
173176, 408241G, 408710, 409134, 74613, E21B 1900, B23B 4900
Patent
active
053600720
ABSTRACT:
A drill rig which is equipped with one or more safety mechanisms designed to prevent injuries to rig operators. In a first embodiment, the safety mechanism includes a barrier which is shiftably mounted to the rig and surrounds the drilling tool when the barrier is in the closed position. The barrier includes a key member which must be fitted into a sensor-equipped keyhole in the rig for the drilling tools to operate. A brake may also be connected to the drill spindle to stop rotation until the barrier is closed. In a second embodiment, a sensor is connected to a delay timer. The sensor is also connected to the clutch and transmission and alerts the operator that the clutch is disengaged but the transmission is not in neutral by sounding a warning buzzer after a predetermined time. If the operator fails to actuate a disconnect switch by shifting to a neutral position within a second predetermined time, a second delay timer activates to shut off the engine. A brake may also be connected between the spindle and the delay timer to prevent spindle rotation.
REFERENCES:
patent: 3783709 (1974-01-01), Scott
patent: 3939749 (1976-02-01), Muller et al.
patent: 4033218 (1977-07-01), Donatelle
patent: 4132497 (1979-01-01), Weller et al.
patent: 4137795 (1979-02-01), Lindquist
patent: 4552494 (1985-11-01), Wix
patent: 4825962 (1989-05-01), Girault
patent: 5085280 (1992-02-01), Rassieur
patent: 5265497 (1993-11-01), Curless
Hall James D.
Smith Scott
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