Tool driving or impacting – Advance causing or controlling means – Driven flexible member causes advance
Patent
1980-05-12
1981-10-27
Feldbaum, Ronald
Tool driving or impacting
Advance causing or controlling means
Driven flexible member causes advance
173160, 254284, B23Q 5027, B23Q 5033
Patent
active
042968194
ABSTRACT:
A downcrowding device for an earth boring apparatus has an improved take-up device for taking up slack in the downcrowding cable. The downcrowding device is of the type having a rotatable drum, hydraulic rams for moving the drum downwardly, a brake for preventing rotation of the drum while moving downwardly, and a downcrowding cable that is connected directly to the top of the kelly and wrapped around the drum. The take-up device includes a take-up sheave that is suspended from the mast. A take-up cable is wrapped around the drum for rotating the drum in the opposite direction to the downcrowding cable. The take-up cable is reeved over the take-up sheave and is connected to the top of the kelly. The cable tensioner is located between the mast and the take-up sheave for allowing the sheave to move downwardly with respect to the mast as the kelly and drum move downwardly during drilling. The cable tensioner draws the take-up sheave upwardly with respect to the mast to rotate the drum and take up slack as the drum is moved upwardly with the brake released. The displacement of the cable tensioner is equal to the displacement of the kelly or the drum.
REFERENCES:
patent: 4137974 (1979-02-01), Decker
patent: 4150727 (1979-04-01), Shepherd
Feldbaum Ronald
Felsman Robert A.
Hughes Tool Company
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