Patent ID: 6202765
Filing Date: 2001-03-20
Classification: E21B,E21D,E21F

Abstract:
A device for sucking off drillings into a reception space of a housing during the drilling of boreholes, said device comprising:a fan and a filter mounted within said housing, said fan being operative to move air from the reception space through the filter for discharge from the housing;a lid movable between closed and open positions relative to an opening in the reception space, said lid permitting emptying of drillings from the reception space through said opening when the lid is in the open position;a rod connected to said lid so as to be displaced when said lid is moved between closed and open positions; andmeans engaging said rod and joined to the filter to impart vibrational movement to the filter in response to relative movement between the rod and the rod-engaging means when said rod is displaced, one of the rod and the rod-engaging means including a ratchet located where the rod-engaging means engages the rod.