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US 4,121,504 AGranted
Cylinder positioning systems
AssigneeInovec, Inc.
InventorAndrew Nowak
Life of this patent
Estimating the term…
Abstract
A linear positioning cylinder drive has a piston connected at one end to a load and at the other end to a cable. The cable is secured to a pulley secured to a shaft urged in a takeup direction by a coil spring or hydraulic motor. The piston is moved by a hydraulic pump through a servo valve actuated by a circuit controlled by a transducer driven by the shaft. In one embodiment, the transducer is rotary and in another embodiment the transducer is linear.
Claims1
In a positioning system,
- a cylinder,
- piston means having a piston, a work piston rod at one end of the piston and coupling means at the other end of the piston, and
- block means sealed to a cylinder end closest to said one end of said piston
- housing block means sealed to the end of the cylinder closest to said other end of the piston,
- a cable having an end portion secured to the coupling means,
- a capstan pulley around which the cable extends,
- a rotary shaft mounting the pulley,
- a pair of bearing means in the housing block means mounting the shaft in a position in which the pulley is tangential to a line parallel to the centerline of the piston and spaced one-half the diameter of the cable from said centerline,
- a pair of seals in the housing block means journalling the shaft,
- a coil spring connected to the housing block means and one end portion of the shaft outside one of the seals,
- first port means at one end of the cylinder,
- second port means at the other end of the cylinder,
- and rotary transducer means mounted on the housing block means in a position at the other end of the shaft outside the other seal and coupled to the shaft, said housing block means including a housing block mounting one of the bearing means and one of the seals, and also including a spring housing means housing the spring means and the other bearing means and the other seal.
10 more elements
Dependencies are inferred from the claim text.