Tool driving or impacting – Automatic control of power operated means – Tool advance causing or controlling means
Patent
1978-01-23
1981-01-27
Staab, Lawrence J.
Tool driving or impacting
Automatic control of power operated means
Tool advance causing or controlling means
173 9, 173 11, B23Q 500
Patent
active
042469732
ABSTRACT:
A control system for a hydraulic percussion rock drill and feed mechanism including a single constant power hydraulic pump for supplying pressure fluid to operate the feed mechanism, drill stem rotation motor, and the percussion hammer. The drill feed, rotation and percussion functions are controlled by individual manually actuated pressure compensated valves. Fluid pressure to the feed mechanism is controllable at one of two selectable pressures and is automatically reduced if fluid pressure to the drill stem rotation motor exceeds a predetermined limit. The drill percussion blow intensity and frequency is controlled by a mechanism responsive to a fluid pressure signal which is automatically operated to provide for a high blow frequency and low blow intensity operating mode when the drill is retracted away from the workface. The constant power hydraulic pump is provided with a control which will adjust the pump output to a partial displacement setting when the drill is being retracted away from the workface. Alternatively, the pump control may be set to full displacement with a power limit and the drill percussion mechanism fluid supply may be automatically throttled when the drill is being retracted away from the workface.
REFERENCES:
patent: 2804751 (1957-09-01), Schroeder
patent: 3561542 (1971-02-01), Hanson et al.
patent: 3823784 (1974-07-01), Feucht
patent: 3995700 (1976-12-01), Mayer et al.
patent: 4023626 (1977-05-01), Salmi et al.
patent: 4062411 (1977-12-01), Adkins et al.
patent: 4068728 (1978-01-01), Subrick
patent: 4074771 (1978-02-01), Morrison
Cooper Industries Inc.
Martin Michael E.
Staab Lawrence J.
LandOfFree
Controls for hydraulic percussion drill does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Controls for hydraulic percussion drill, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Controls for hydraulic percussion drill will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1176942