B - Operations – Transporting – 66 – D
Patent
B - Operations, Transporting
66
D
B66D 5/00 (2006.01)
Patent
CA 2043096
ABSTRACT OF THE DISCLOSURE The device serves to convert rotary motion to hydraulic pressure and vice versa. A piston assembly is entirely located within a cylinder, including a piston head and a piston stem fixed to the piston head. The piston assembly divides the cylinder into two distinct variable volume chambers to be filled with a fluid. The piston assembly is prevented from rotating relative to the cylinder. A rotary shaft extends through one closed end of the cylinder and has an inner portion in telescopic and threaded engagement with the piston stem. Two fluid ports communicate with the respective chambers for allowing a fluid to alternately exit from and enter into the chambers. Rotation of the shaft causes longitudinal displacement of the piston assembly relative to the cylinder or vice versa. The device can have different applications: for instance, if a throttle valve is connected across the two ports, controlled braking of the shaft rotated by an external torque, is obtained. If a hydraulic ram is connected across the two ports, rotation of the shaft by an external torque will actuate the ram. If the pitch of the complementary threads of the piston stem and shaft is high enough, pressure fluid applied to the piston will rotate the shaft.
Lagace Jean-Hugues
Lesperance & Martineau
LandOfFree
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