Cylinder piston unit for a power operated revolving chuck

Claim 2

A revolving pressurized fluid actuated operator for a chuck and for use with fluid supply connections which are alternately pressurized and vented, comprising: a cylinder to confine a pressurized fluid, a piston in the cylinder and dividing the cylinder into a pair of fluid chambers, and the piston having a rod movable with the piston and relative to the cylinder to operate the chuck, the piston rod having an elongate hollow interior with opposite ends adjacent the opposite sides of the piston, fluid supply means attachable to such alternately pressurized and vented fluid connections and including radial bores in the piston rod at opposite sides of the piston to direct pressurized fluid to the chambers and to vent the chambers alternately for controlling the piston movement in the cylinder and including check valves for each cylinder chamber to be opened and closed responsive to pressure reversal in the fluid supply means, said check valves comprising a pair of valve elements respectively disposed at opposite sides of the piston and on the piston rod and in obstructing relation with said radial bores to prevent release of fluid pressure in the chambers, said fluid supply means including duct means in the hollow piston rod defining and separating fluid channels from each other, said channels respectively communicating with opposite ends of the hollow interior of the piston rod to alternately vent and pressurize the ends of the hollow interior and bores, operating means responsive to pressure reversal at such fluid supply connections to selectively lift the valve elements out of obstructing relation with the bores to alternately vent the chambers and including radially movable actuating members in the bores at both sides of the piston and acting on the valve elements to lift the valve elements out of obstructing relation and said actuating members also protruding into the hollow interior of the piston rod, and an auxiliary fluid pressureoperated piston slidable in the hollow interior of the piston rod and sealably isolating said opposite ends of the hollow interior from each other, said auxiliary piston being exposed to different fluid pressures at opposite ends of the hollow interior of the piston rod and being moved endwise in the piston rod by the fluid pressure differentials, and said auxiliary piston being provided with cam faces engaging said actuating members for radially moving the actuating members in the bores.

Claim 3

A revolving pressurized fluid actuated operator for a chuck and for use with fluid supply connections which are alternately pressurized and vented, comprising: a cylinder to confine a pressurized fluid, a piston in the cylinder and dividing the cylinder into a pair of fluid chambers, and the piston having a rod movable with the piston and relative to the cylinder to operate the chuck, the piston rod having an elongate hollow interior with opposite ends adjacent the opposite sides of the piston, fluid supply means attachable to such alternately pressurized and vented fluid connections and including radial bores in the piston rod at opposite sides of the piston to direct pressurized fluid to the chambers and to vent the chambers alternately for controlling the piston movement in the cylinder and including check valves for each cylinder chamber to be opened and closed responsive to pressure reversal in the fluid supply means, said check valves comprising a pair of valve elements respectively disposed at opposite sides of the piston and on the piston rod and in obstructing relation with said radial bores to prevent release of fluid pressure in the chambers, said fluid supply means including duct means in the hollow piston rod defining and separating fluid channels from each other, said channels respectively communicating with opposite ends of the hollow interior of the piston rod to alternately vent and pressurize the ends of the hollow interior and bores, operating means responsive to pressure reversal at such fluid supply connections to selectively lift the valve elements out of obstructing relation with the bores to alternately vent the chambers and including radially movable actuating members in the bores at both sides of the piston and acting on the valve elements to lift the valve elements out of obstructing relation and said actuating members also protruding into the hollow interior of the piston rod, and an auxiliary fluid pressure-operated piston slidable in the hollow interior of the piston rod and sealably isolating said opposite ends of the hollow interior from each other, said auxiliary piston being exposed to different fluid pressures at opposite ends of the hollow interior of the piston rod and being moved endwise in the piston rod by the fluid pressure differentials, and said auxiliary piston being provided with cam faces engaging said actuating members for radially moving the actuating members in the bores.

Claim 4

A revolving pressurized fluid actuated operator for a chuck and for use with fluid supply connections which are alternately pressurized and vented, comprising: a cylinder to confine a pressurized fluid, a piston in the cylinder and dividing the cylinder into a pair of fluid chambers, and the piston having a rod movable with the piston and relative to the cylinder to operate the chuck, the piston rod having an elongate hollow interior with opposite ends adjacent the opposite sides of the piston, fluid supply means attachable to such alternately pressurized and vented fluid connections and including radial bores in the piston rod at opposite sides of the piston to direct pressurized fluid to the chambers and to vent the chambers alternately for controlling the piston movement in the cylinder and including check valves for each cylinder chamber to be opened and closed responsive to pressure reversal in the fluid supply means, said check valves comprising a pair of valve elements respectively disposed at opposite sides of the piston and on the piston rod and in obstructing relation with said radial bores to prevent release of fluid pressure in the chambers, said fluid supply means including duct means in the hollow piston rod defining and separating fluid channels from each other, said channels respectively communicating with opposite ends of the hollow interior of the piston rod to alternately vent and pressurize the ends of the hollow interior and bores, operating means responsive to pressure reversal at such fluid supply connections to selectively lift the valve elements out of obstructing relation with the bores to alternately vent the chambers and including radially movable actuating members in the bores at both sides of the piston and acting on the valve elements to lift the valve elements out of obstructing relation and said actuating members also protruding into the hollow interior of the piston rod, and an auxiliary fluid pressure-operated piston slidable in the hollow interior of the piston rod and sealably isolating said opposite ends of the hollow interior from each other, said auxiliary piston being exposed to different fluid pressures at opposite ends of the hollow interior of the piston rod and being moved endwise in the piston rod by the fluid pressure differentials, and said auxiliary piston being provided with cam faces engaging said actuating members for radially moving the actuating members in the bores.

Claim 5

A pressurized air actuated cylinder piston unit, comprising in combination: a hollow cylinder having a cylinder head at each end, a piston movable relative to said cylinder and mounted on a piston rod extending through both cylinder heads, means sealing said piston and piston rod against said cylinder, said piston rod having a first and a second axially extending channel, a sleeve being sealingly mounted about the piston rod end remote from said cylinder and provided with first and second axially spaced radial openings to be alternatively connected to a pressurized air source, each opening communicating with an internal circumferential groove within said sleeve, the first opening being via the respective groove and a radial aperture in the piston rod in communication with the first axially extending channel thereof and the second opening being via its groove and a radial aperture in the piston rod in communication with the second axially extending channel thereof, said sleeve and the assembly consisting of piston rod, piston, and cylinder being rotatable with respect to each other, a first set of radial passages extending from the first of said piston rod channels into a first cylinder chamber confined by the cylinder, the piston, and the piston rod, a second set of radial passages extending from said second piston rod channel into a second chamber confined by the cylinder, piston, and piston rod separated from the first chamber by the piston, radially resilient ring means surrounding the piston rod at the position of said first and second sets of radial passages closing the respective passages to prevent pressure drop within the respective chamber, and actuating means to radially expand the ring means and to render communicating the respective chamber and channel in response to pressure increase in the respective other channel, said actuating means including radially movable plungers in said radial passages to lift the resilient ring means out of obstructing relation with the passages to release pressure in said cylinder chambers, said actuating means also including a slidable operator movable along the piston rod and having oblique cam surfaces engaging the plungers in said first and second set of radial passages for alternately opening said first and second passages as the operator is moved endwise of the piston rod, and means slidably mounting said operator within the piston rod between said first and second axially extending channels to facilitate movement of the operator under influence of the pressure reversal in said first and second axially extending channels to release the pressure in said chambers as the fluid pressure is reversed at the radial openings of the sleeve.

Claim 6

A pressurized air actuated cylinder piston unit, comprising in combination: a hollow cylinder having a cylinder head at each end, a piston movable relative to said cylinder and mounted on a piston rod extending through both cylinder heads, means sealing said piston and piston rod against said cylinder, said piston rod having a first and a second axially extending channel, a sleeve being sealingly mounted about the piston rod end remote from said cylinder and provided with first and second axially spaced radial openings to be alternatively connected to a pressurized air source, each opening communicating with an internal circumferential groove within said sleeve, the first opening being via the respective groove and a radial aperture in the piston rod in communication with the first axially extending channel thereof and the second opening being via its groove and a radial aperture in the piston rod in communication with the second axially extending channel thereof, said sleeve and the assembly consisting of piston rod, piston, and cylinder being rotatable with respect to each other, a first set of radial passages extending from the first of said piston rod channels into a first cylinder chamber confined by the cylinder, the piston, and the piston rod, a second set of radial passages extending from said second piston rod channel into a second chamber confined by the cylinder, piston, and piston rod separated from the first chamber by the piston, radially resilient ring means surrounding the piston rod at the position of said first and second sets of radial passages closing the respective passages to prevent pressure drop within the respective chamber, and actuating means to radially expand the ring means and to render communicating the respective chamber and channel in response to pressure increase in the respective other channel, said actuating means including radially movable plungers in said radial passages to lift the resilient ring means out of obstructing relation with the passages to release pressure in said cylinder chambers, said actuating means also including a slidable operator movable along the piston rod and having oblique cam surfaces engaging the plungers in said first and second set of radial passages for alternately opening said first and second passages as the operator is moved endwise of the piston rod, and means slidably mounting said operator within the piston rod between said first and second axially extending channels to facilitate movement of the operator under influence of the pressure reversal in said first and second axially extending channels to release the pressure in said chambers as the fluid pressure is reversed at the radial openings of the sleeve.

Claim 7

A fluid actuated operator as claimed in claim 3 wherein a plurality of said actuation members are movably mounted in bores at both sides of the piston to lift the deformable check valve rings for venting alternate chambers, and said auxiliary piston having tapered ends engaging said actuation members and alternately urge said actuation members outwardly.

Claim 8

An operator as claimed in claim 4 wherein said actuation members are plungers guided within said bores.

Claim 9

A revolving pressurized fluid actuated operator for a chuck, comprising: a cylinder to confine a pressurized fluid; a piston in the cylinder and dividing the cylinder into a pair of fluid chambers, and the piston having a piston rod movable with the piston and relative to the cylinder to operate the chuck, the piston rod having a hollow interior adjacent the piston defining a combined fluid passage and guideway, said piston rod also having a plurality of radial bores extending between said hollow interior and the exterior of the piston rod, said bores being disposed in at least two locations along the length of the piston rod adjacent each of said chambers so that certain of said bores provide communication between the hollow interior and one of the chambers, and the remaining bores provide communication between the hollow interior and the other of the chambers; releasable valve means at the exterior of said piston rod and obstructing said radial bores, and including a plurality of plungers extending inwardly through said bores and protruding into said hollow interior, said valve means being biased into bore-obstructing position and being operable in response to outward movement of said plungers to open the valve means and release pressure from the chamber; a plunger-operating slider in said hollow interior of the piston rod which defines the slideway for the slider, said slider traversing the hollow interior and sealing around the interior periphery of the slideway to obstruct fluid communication longitudinally along the hollow interior of the piston rod, said slider having oblique camming surfaces bearing outwardly against said plungers to restrain inward movement of the plungers and produce radial outward movement of the plungers as the slider moves longitudinally along the piston rod for operating said valve means; and said piston rod having a pair of separate fluid passages each communicating with a respective end of the hollow interior of said piston rod to facilitate control of the fluid pressure applied to said bores and to the corresponding sides of the slider for simultaneously pressurizing one of the cylinder chambers and venting the other chamber as the slider operates the plungers and valve means, wherein said piston rod includes a stationary tube extending longitudinally thRough said hollow interior and being connected to one of said fluid passages, and said slider being annular and having an interior periphery mounted upon and sliding along the exterior of said tube.

Claim 10

A revolving pressurized fluid actuated operator for a chuck, comprising: a cylinder to confine a pressurized fluid; a piston in the cylinder and dividing the cylinder into a pair of fluid chambers, and the piston having a piston rod movable with the piston and relative to the cylinder to operate the chuck, the piston rod having a hollow interior adjacent the piston defining a combined fluid passage and guideway, said piston rod also having a plurality of radial bores extending between said hollow interior and the exterior of the piston rod, said bores being disposed in at least two locations along the length of the piston rod adjacent each of said chambers so that certain of said bores provide communication between the hollow interior and one of the chambers, and the remaining bores provide communication between the hollow interior and the other of the chambers; releasable valve means at the exterior of said piston rod and obstructing said radial bores, and including a plurality of plungers extending inwardly through said bores and protruding into said hollow interior, said valve means being biased into bore-obstructing position and being operable in response to outward movement of said plungers to open the valve means and release pressure from the chamber; a plunger-operating slider in said hollow interior of the piston rod which defines the slideway for the slider, said slider traversing the hollow interior and sealing around the interior periphery of the slideway to obstruct fluid communication longitudinally along the hollow interior of the piston rod, said slider having oblique camming surfaces bearing outwardly against said plungers to restrain inward movement of the plungers and produce radial outward movement of the plungers as the slider moves longitudinally along the piston rod for operating said valve means; and said piston rod having a pair of separate fluid passages each communicating with a respective end of the hollow interior of said piston rod to facilitate control of the fluid pressure applied to said bores and to the corresponding sides of the slider for simultaneously pressurizing one of the cylinder chambers and venting the other chamber as the slider operates the plungers and valve means, wherein said piston rod includes a stationary tube extending longitudinally thRough said hollow interior and being connected to one of said fluid passages, and said slider being annular and having an interior periphery mounted upon and sliding along the exterior of said tube.