Expansible chamber devices – Relatively movable working members – Interconnected with common rotatable shaft
Reexamination Certificate
2005-12-27
2005-12-27
Lazo, Thomas E. (Department: 3745)
Expansible chamber devices
Relatively movable working members
Interconnected with common rotatable shaft
C091S498000
Reexamination Certificate
active
06978713
ABSTRACT:
A hydraulic motor having radial pistons, and comprising a cam, a distributor, and a cylinder block whose cylinders are connected to communication orifices situated in a communication face of the cylinder block. The distributor has a distribution face in which distribution orifices open out that are suitable for communicating with the communication orifices while the cylinder block and the distributor are turning relative to each other. The cam is provided with a plurality of lobes, each of which has two ramps (50), each of which has a convex portion (51) and a concave portion (52). The edge of each distribution orifice has a leading portion (B1) via which communication between the distribution orifice and the communication orifices opens, and a trailing portion (B2) via which said communication closes. Each leading portion (B1) and each trailing portion (B2) of the edges of at least certain distribution orifices (21A,23A) has an edge arrangement (53A;53B) provided with at least one notch (54A;54B), said edge arrangements of a distribution orifice being different depending on whether they are in angular correspondence with the convex region (51) or with the concave region (52) of the ramp of the cam.
REFERENCES:
patent: 4522110 (1985-06-01), Samuelsson
patent: 5261318 (1993-11-01), Allart
patent: 829553 (1952-01-01), None
patent: 2634065 (1978-02-01), None
patent: 0935069 (1999-08-01), None
patent: 2587761 (1987-03-01), None
Allart Bernard
Bigo Louis
Ladas & Parry LLP
Lazo Thomas E.
Poclain Hydraulics Industrie
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