| 摘要 |
<p>Hydro-pneumatic tool, particularly hand-held hydro-pneumatic secateurs intended for cutting or harvesting work in agriculture, arboriculture, viticulture or horticulture, comprising, principally: an actual tool, at least one movable active element of which is slaved to a piston mounted so as to be able to slide axially in the bore of a cylinder and forming, with the latter, a receiving hydraulic jack; and an air-oil pressure intensifier comprising a hydro-pneumatic piston (19-20-21) formed from a large piston (19) and a small piston (20) and whose active stroke takes place under the thrust of a compressed gaseuous fluid being applied to the large working face of the said large piston; the working face of the said small piston which forms the piston of a drive hydraulic jack (20-22) making it possible to apply a pressure on the hydraulic fluid intended to actuate the piston of the receiving hydraulic jack of the actual tool; characterised in that it comprises oil-leak compensation means comprising a reservoir (F), for example provided inside the body (18) of the air-oil intensifier, and an arrangement (E, 22a, 22b, 24a, 24b) making it possible to establish communication between this reservoir and the chamber of the drive hydraulic jack (20-22) when the piston (20) of the latter is in the retracted or rest position. <IMAGE></p> |
