Safety device for rotary earth drilling apparatus

Details Safety device for rotary earth drilling apparatus Safety device for rotary earth drilling apparatus

1980-02-04

1981-12-01

Feldbaum, Ronald

Tool driving or impacting

Advance causing or controlling means

Driven flexible member causes advance

B23Q 5027, B23Q 5033

Patent

active

043031323

ABSTRACT:
A safety device for a drilling rig of the type wherein a drill-carrying cradle is caused to move upwardly or downwardly on a tower by a chain which traverses sprockets at opposite ends of the tower. Shock loads and vibration cause premature failures in the chain when withdrawing a drill string as the cradle is pulled upwardly on the tower. The present invention minimizes shock loads on the chain to minimize the possibility of a chain failure and, at the same time, prevents a fall of the cradle and drill carried thereby if the chain above it should break, this latter function being accomplished with the use of spring-loaded toothed dogs on the cradle which engage the tower and prevent movement of the cradle in the event of a chain failure.

REFERENCES:
patent: 2338625 (1944-01-01), Curtis
patent: 2564188 (1951-08-01), Burge et al.
patent: 3973634 (1976-08-01), Persson et al.
patent: 4020909 (1977-05-01), Airaudo
patent: 4124081 (1978-11-01), Deike
patent: 4191263 (1980-03-01), Malterer

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