Rotary earth drill bit socket shield

Details Rotary earth drill bit socket shield Rotary earth drill bit socket shield

E - Fixed Constructions

21

B

E21B 10/02 (2006.01) E21B 10/42 (2006.01) E21B 10/46 (2006.01) E21B 10/62 (2006.01)

Patent

CA 2146483

In a rotary earth drill in which sockets are welded to and spaced around a head and drill bits are removably mounted in the sockets, the sockets having a surface exposed to abrasion when the drill is rotated in the earth, a shield in the form of a shroud or jacket is provided, removably mounted on the socket, and extending around the otherwise exposed surface of the socket to protect the socket surface from abrasion. When the shield itself becomes worn, it can easily be removed, in much the way in which the bits are removed, and replaced. In order to accommodate the weld by which the socket is secured to the drill head, the shield is provided with a slot, open at at least one end. The slot is wide enough to permit side edges defining the slot to straddle the weld.

Tarière rotative à douilles soudées à intervalles autour de la tête, et à forets amovibles montés dans les douilles. Lorsque la tarière tourne dans la terre, une partie de la surface des douilles est exposée à l'usure; un blindage protecteur amovible, sous la forme d'une enveloppe ou d'une chemise est donc prévu; celui-ci est monté sur la douille et se prolonge autour de la portion de surface de douille exposée afin de la protéger contre l'usure. Lorsque le blindage lui-même devient usé, il peut être enlevé, sensiblement de la même façon dont les forets sont retirés, et remplacé. Pour permettre de souder la douille sur la tête de la tarière, le blindage comporte une rainure, ouverte à au moins une extrémité et suffisamment large pour permettre aux côtés latéraux de celle-ci de chevaucher la soudure.

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