B - Operations – Transporting – 25 – D
Patent
B - Operations, Transporting
25
D
B25D 17/24 (2006.01) B25D 9/12 (2006.01) B25D 16/00 (2006.01) E21B 6/00 (2006.01)
Patent
CA 2479055
The invention relates to a hydraulic rotary-percussive hammer drill (1) comprising a body (2) containing an alternating impact piston (4) which slides due to the effect of a main hydraulic feed circuit (22), said main circuit also being intended to cause an essentially annular stop piston (5) to slide in a cavity (3) of the body. The aforementioned stop piston comprises (i) a front face which is in contact with a shank (7) and which is intended to position said shank at a pre-determined distance from the impact piston and (ii) a rear face opposite a rear wall of the cavity. The invention is characterised in that, when the main circuit is stopped, an external hydraulic feed circuit (23) can introduce a pressurised fluid between the rear face of the stop piston and the rear wall of the cavity, such as to maintain a space between same. The inventive hammer drill is suitable for drilling installations.
La présente invention se rapporte à un marteau perforateur (1) hydraulique roto-percutant comprenant un corps (2) renfermant un piston de frappe (4) alternatif coulissant sous l'effet d'un circuit principal (22) d'alimentation hydraulique, ce circuit principal étant destiné à provoquer le coulissement d'un piston de butée (5) sensiblement annulaire logé dans une cavité (3) du corps et possédant, d'une part, une face avant au contact d'un emmanchement (7) destinée à placer celui-ci à une distance prédéterminée du piston de frappe, et d'autre part, une face arrière en regard d'une paroi arrière de la cavité, caractérisé en ce qu'un circuit externe (23) d'alimentation hydraulique est apte, lors de l'arrêt du circuit principal, à introduire un fluide sous-pression entre la face arrière du piston de butée et la paroi arrière de la cavité de façon à maintenir un espace entre celles-ci. Application aux installations de forage.
Montabert S.a.
Robic
LandOfFree
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