Fluid activated load operator

An automatic fluid activated operating apparatus for controlling a fluid motor means driven from a fluid supply means and a fluid exhaust means and having a pair of operating port means for supplying and exhausting of fluid from the motor means, comprising metering valve means connected to said port means to exhaust fluid from the motor means, said metering valve means including a plurality of passageway means between the port means and the exhaust means, at least a first of said passageway means including closure means for varying the effective size of said first passageway means, and said closure means being coupled to the motor means and selectively positioned in accordance with the relative position of said motor means after selected movement of the motor means to change the effective operation of said first passageway means to control the rate of change movement of the output of the motor means, said metering valve means includes a body portion including a first, second and third parallel passageway between a motor connection means and a supply-exhaust connection means, said body portion having mounting means for connection to the motor means, said first passageway means being adjustable and providing a first restricted flow passageway controlled by said closure means, said first passageway means being located between said second and third passageway means and including a cross-opening therethrough, said closure means being a piston-like element mounted in said cross-opening and coupled to the motor means for selectively positioning in accordance with the relative position of said motor means, the third of said passageways constituting a one-way flow passageway means permitting full transfer of fluid pressure from the supply-exhaust connection means to the motor connection means and restricting reverse flow, and the second of said passageways providing a continuous restricted flow passageway.

An automatic fluid activated operating apparatus for controlling a cylinder operator having a cylinder with a pair of end ports for selectively supplying and exhausting of fluid from the said ports for reversibly driving a piston having an output rod, a pair of individual metering valve assemblies connected respectively to each of said ports and each having a common supply-exhaust connection means and a port connection means, each of said metering valve assemblies including a plurality of passageway means between the port connection means and the supply-exhaust connection means, at least a first of said passageway means including closure means for varying the effective size of said first passageway means, and said closure means being coupled to the motor means and selectively positioned in accordance with the relative position of said motor means after selected movement of the motor means to change the effective operation of said first passageway means to control the rate of change movement of the output of the motor means, control valve means for selectively connecting said common supply-exhaust connection means of said pair of valve assemblies to supply and exhaust fluid from said cylinder, each of said metering valve assemblies includes a body portion including a first, second and third parallel passageway between the motor connection means and the supply-exhaust connection means, the first of said passageways constituting a one-way flow passageway means permitting full transfer of fluid pressure from the supply-exhaust connection means to the port connection and restricting reverse flow from the cylinder, said second passageway means being adjustable and providing a first restricted flow passageway between the metering connections, said second passageway means including means for positively closing said passageway, and said closure means being coupled to the motor means and selectively positioned in accordance with the relative position of said motor means, and said third passageway means including an adjustable means to define a restricted passageway between the metering valve assembly connections, said third passageway means having a restriction significantly greater than restriction of said second passageway means whereby the third passageway means provides maximum damping characteristics through movement of the fluid motor and automatic means for selectively controlling the connection of the supply means and the exhaust means to said metering valve means.

An automatic fluid activated operating apparatus for controlling a cylinder operator having a cylinder with a pair of end ports for selectively supplying and exhausting of fluid from the said ports for reversibly driving a piston having an output rod, a pair of individual metering valve assemblies connected respectively to each of said ports and each having a common supply-exhaust connection means and a port connection means, each of said metering valve assemblies including a plurality of passageway means between the port connection means and the supply-exhaust connection means, at least a first of said passageway means including closure means for varying the effective size of said first passageway means, and said closure means being coupled to the motor means and selectively positioned in accordance with the relative position of said motor means after selected movement of the motor means to change the effective operation of said first passageway means to control the rate of change movement of the output of the motor means, control valve means for selectively connecting said common supply-exhaust connection means of said pair of valve assemblies to supply and exhaust fluid from said cylinder, an enclosure, means mounting said cylinder, said control valve means and metering valve assemblies within said enclosure, and means within said enclosure to control the operating temperature within the enclosure.

An automatic pneumatic door controller comprising a reversible pneumatic cylinder unit having opposite end ports for selectively supplying and exhausting of air to correspondingly position a piston and piston rod, the relative connection of the supply and of the exhaust connections to said ports determining the direction of the piston, a pair of individual metering valve assemblies connected respectively to each of said ports and each having a common supply-exhaust connection means, means for selectively connecting said common supply connection means to a supply means and to an exhaust means, each of said metering valve assemblies including a body portion including a first, second and third parallel passageway between the port connection means and the supply-exhaust connection means, the first of said passageways constituting a one-way flow passageway means permitting full transfer of air pressure from the supply connection means to the port connection means and preventing reverse flow from the cylinder, said second passageway means being adjustable and providing a first restricted flow passageway between the metering connections, said second passageway means including means for positively closing said passageway, said closure means being coupled to the motor means and selectively positioned in accordance with the relative position of said motor means, said third passageway means including an adjustable means to define a restricted passageway, said third passageway means having a minimum restriction significantly smaller that the minimum restriction of said second passageway means whereby the third passageway means provided maximum damping characteristics, an automatic means for selectively controlling the connection of the supply means and the exhaust means to said metering valve means.