Fluid pressure device

Claim 2

A fluid pressure device comprising a cylindrical housing having a chamber, a guide rod extending into said chamber, a combined piston and cylinder assembly reciprocably disposed on said guide rod within said chamber, said guide rod having a plunger at its end slidably disposed within the cylinder of said combined piston and cylinder assembly and dividing said cylinder into a first pressure chamber on one side of said plunger and a second pressure chamber on the other side of said plunger, spring means normally biasing said combined piston and cylinder assembly in a first direction, means connecting said first pressure chamber with a source of fluid pressure to thereby produce movement of said combined piston and cylinder assembly in a second direction and against said spring means, means associated with said plunger to establish fluid communication between said first pressure chamber and said second pressure chamber to permit fluid from said first pressure chamber to pass into said second pressure chamber at a predetermined rate to thereby produce movement of said combined cylinder and piston assembly in said first direction, said guide rod being secured to an end wall of said cylindrical housing, said means connecting said first pressure chamber with said source of fluid pressure comprising a first channel extending through said end wall and a second channel extending through said guide rod, said second channel being connected to a passage within said piston which is open towards said first pressure chamber.

Claim 3

A fluid pressure device as defined in claim 1, in which said passage within said piston comprises a cylindrical bore through which said guide rod extends, having a diameter larger than the diameter of said guide rod.

Claim 4

A fluid pressure device as defined in claim 2, in which said plunger is provided with means to normally substantially close said passage when the piston is in inactive position.

Claim 5

A fluid pressure device as defined in claim 3, in which said piston is provided with an orifice connecting said passage to said first pressure chamber bypassing said connecting means to normally close said passage to permit fluid to enter said first pressure chamber to move said piston away from said plunGer and said means normally closing said passage to thereby fully open said passage to said first pressure chamber.

Claim 6

A fluid pressure device as defined in claim 1, in which said spring means is retained around said guide rod between said piston and said end wall of said housing.

Claim 7

A fluid pressure device comprising a cylindrical housing having a chamber, a guide rod extending into said chamber, a combined piston and cylinder assembly reciprocably disposed on said guide rod within said chamber, said guide rod having a plunger at its end slidably disposed within the cylinder of said combined piston and cylinder assembly and dividing said cylinder into a first pressure chamber on one side of said plunger and a second pressure chamber on the other side of said plunger, spring means normally biasing said combined piston and cylinder assembly in a first direction, means connecting said first pressure chamber with a source of fluid pressure to thereby produce movement of said combined piston and cylinder assembly in a second direction and against said spring means, means associated with said plunger to establish fluid communication between said first pressure chamber and said second pressure chamber to permit fluid from said first pressure chamber to pass into said second pressure chamber at a predetermined rate to thereby produce movement of said combined cylinder and piston assembly in said first direction, said means associated with said plunger comprising a radial contact surface on said plunger normally sealing said first pressure chamber from said second pressure chamber and being pressure responsive to bypass fluid in metered amounts from said first pressure chamber to said second pressure chamber.

Claim 8

A fluid pressure device comprising a cylindrical housing having a chamber, a guide rod extending into said chamber, a combined piston and cylinder assembly reciprocably disposed on said guide rod within said chamber, said guide rod having a plunger at its end slidably disposed within the cylinder of said combined piston and cylinder assembly and dividing said cylinder into a first pressure chamber on one side of said plunger and a second pressure chamber on the other side of said plunger, spring means normally biasing said combined piston and cylinder assembly in a first direction, means connecting said first pressure chamber with a source of fluid pressure to thereby produce movement of said combined piston and cylinder assembly in a second direction and against said spring means, means associated with said plunger to establish fluid communication between said first pressure chamber and said second pressure chamber to permit fluid from said first pressure chamber to pass into said second pressure chamber at a predetermined rate to thereby produce movement of said combined cylinder and piston assembly in said first direction, said means associated with said plunger comprising a radial contact surface on said plunger normally sealing said first pressure chamber from said second pressure chamber and being pressure responsive to bypass fluid in metered amounts from said first pressure chamber to said second pressure chamber.

Claim 9

A fluid pressure device comprising a cylindrical housing having a chamber, a guide rod extending into said chamber, a combined piston and cylinder assembly reciprocably disposed on said guide rod within said chamber, said guide rod having a plunger at its end slidably disposed within the cylinder of said combined piston and cylinder assembly and dividing said cylinder into a first pressure chamber on one side of said plunger and a second pressure chamber on the other side of said plunger, spring means normally biasing said combined piston and cylinder assembly in a first direction, means connecting said first pressure chamber with a source of fluid pressure to thereby produce movement of said combined piston and cylinder assembly in a second direction and against said spring means, means associated with said plunger to establish fluid communication between said first pressure chamber and said second pressure chamber to permit fluid from said first pressure chamber to pass into said second pressure chamber at a predetermined rate of pressure in said first pressure chamber to thereby produce movement of said combined cylinder and piston assembly in said first direction, and means to restrain said piston and cylinder assembly from rotation around said guide rod.

Claim 10

A fluid pressure device comprising a cylindrical housing having a chamber, a guide rod extending into said chamber, a combined piston and cylinder assembly reciprocably disposed on said guide rod within said chamber, said guide rod having a plunger at its end slidably disposed within the cylinder of said combined piston and cylinder assembly and dividing said cylinder into a first pressure chamber on one side of said plunger and a second pressure chamber on the other side of said plunger, spring means normally biasing said combined piston and cylinder assembly in a first direction, means connecting said first pressure chamber with a source of fluid pressure to thereby produce movement of said combined piston and cylinder assembly in a second direction and against said spring means, means associated with said plunger to establish fluid communication between said first pressure chamber and said second pressure chamber to permit fluid from said first pressure chamber to pass into said second pressure chamber at a predetermined rate of pressure in said first pressure chamber to thereby produce movement of said combined cylinder and piston assembly in said first direction, and means to restrain said piston and cylinder assembly from rotation around said guide rod.

Claim 11

In combination, means forming a chamber with a source of pressurized fluid connected with said chamber, a piston member reciprocably movable within said chamber between a first and a second position, said piston member being normally biased toward a first position and provided with a cylindrical portion extending therefrom, a guide rod disposed within said chamber and extending through said piston member and into said cylindrical portion, said guide rod being provided with a plunger slidably disposed within said cylindrical portion and dividing said cylindrical portion into a first pressure chamber in the front of said plunger and a second pressure chamber in the rear of said plunger, first means to establish fluid communication between said first pressure chamber and a source of fluid pressure upon movement of said piston member toward said first position, second means associated with said plunger to meter fluid around said plunger and into said second pressure chamber at a predetermined rate to positiveLy return said piston member to said second position, said first means establishing fluid communication comprising a first channel in communication with said source of fluid pressure extending through a wall portion of said chamber, a second channel connected to said first channel and disposed in transverse direction thereto and axially through said guide rod, a third channel transversely disposed and intersecting said second channel for extension through the surface of said guide rod, and a passage within said piston and in communication with said third channel and opening into said first pressure chamber through an orifice provided in said piston.

Claim 12

In combination, means forming a chamber with a source of pressurized fluid connected with said chamber, a piston member reciprocably movable within said chamber between a first and a second position, said piston member being normally biased toward a first position and provided with a cylindrical portion extending therefrom, a guide rod disposed within said chamber and extending through said piston member and into said cylindrical portion, said guide rod being provided with a plunger slidably disposed within said cylindrical portion and dividing said cylindrical portion into a first pressure chamber in the front of said plunger and a second pressure chamber in the rear of said plunger, first means to establish fluid communication between said first pressure chamber and a source of fluid pressure upon movement of said piston member toward said first position, second means associated with said plunger to meter fluid around said plunger and into said second pressure chamber at a predetermined rate to positiveLy return said piston member to said second position, said first means establishing fluid communication comprising a first channel in communication with said source of fluid pressure extending through a wall portion of said chamber, a second channel connected to said first channel and disposed in transverse direction thereto and axially through said guide rod, a third channel transversely disposed and intersecting said second channel for extension through the surface of said guide rod, and a passage within said piston and in communication with said third channel and opening into said first pressure chamber through an orifice provided in said piston.

Claim 13

In combination, means forming a chamber with a source of pressurized fluid connected with said chamber, a piston member reciprocably movable within said chamber between a first and a second position, said piston member being normally biased toward the first position and provided with a cylindrical portion extending therefrom, a guide rod disposed within said chamber and extending through said piston member and into said cylindrical portion, said guide rod being provided with a plunger slidably disposed within said cylindrical portion and dividing said cylindrical portion into a first pressure chamber in the front of said plunger and a second pressure chamber in the rear of said plunger, first means to establish fluid communication between said first pressure chamber and a source of fluid pressure upon movement of said piston member toward said first position, second means associated with said plunger to meter fluid around said plunger and into said second pressure chamber at a predetermined rate to positively return said piston member to said second position, said second means associated with said plunger to meter fluid into said second chamber comprising a pressure-responsive radial contact surface on said plunger normally sealing said first pressure chamber from said second pressure chamber but yielding to meter fluid therepast upon an increase in pressure in said first pressure chamber beyond a predetermined value.

Claim 14

In combination, means forming a chamber with a source of pressurized fluid connected with said chamber, a piston member reciprocably movable within said chamber between a first and a second position, said piston member being normally biased toward the first position and provided with a cylindrical portion extending therefrom, a guide rod disposed within said chamber and extending through said piston member and into said cylindrical portion, said guide rod being provided with a plunger slidably disposed within said cylindrical portion and dividing said cylindrical portion into a first pressure chamber in the front of said plunger and a second pressure chamber in the rear of said plunger, first means to establish fluid communication between said first pressure chamber and a source of fluid pressure upon movement of said piston member toward said first position, second means associated with said plunger to meter fluid around said plunger and into said second pressure chamber at a predetermined rate to positively return said piston member to said second position, said second means associated with said plunger to meter fluid into said second chamber comprising a pressure-responsive radial contact surface on said plunger normally sealing said first pressure chamber from said second pressure chamber but yielding to meter fluid therepast upon an increase in pressure in said first pressure chamber beyond a predetermined value.

Claim 15

In combination, means forming a chamber with a source of pressurized fluid connected with said chamber, a piston member reciprocably movable within said chamber between a first and a second position, said piston member being normally biased toward the first position and provided with a cylindrical portion extending therefrom, a guide rod disposed within said chamber and extending through said piston member and into said cylindrical portion, said guide rod being provided with a plunger slidably disposed within said cylindrical portion and dividing said cylindrical portion into a first pressure chamber in the front of said plunger and a second pressure chamber in the rear of said plunger, first means to establish fluid communication between said first pressure chamber and a source of fluid pressure upon movement of said piston member toward said first position, second means associated with said plunger to meter fluid around said plunger and into said second pressure chamber at a predetermined rate to positively return said piston member to said second position, indicating means for indicating movement of said piston and comprising a pointer having a rotatable crank end connected to said piston member for rotatable actuation thereby upon movement of said piston within said chamber.

Claim 16

In combination, means forming a chamber with a source of pressurized fluid connected with said chamber, a piston member reciprocably movable within said chamber between a first and a second position, said piston member being normally biased toward the first position and provided with a cylindrical portion extending therefrom, a guide rod disposed within said chamber and extending through said piston member and into said cylindrical portion, said guide rod being provided with a plunger slidably disposed within said cylindrical portion and dividing said cylindrical portion into a first pressure chamber in the front of said plunger and a second pressure chamber in the rear of said plunger, first means to establish fluid communication between said first pressure chamber and a source of fluid pressure upon movement of said piston member toward said first position, second means associated with said plunger to meter fluid around said plunger and into said second pressure chamber at a predetermined rate to positively return said piston member to said second position, indicating means for indicating movement of said piston and comprising a pointer having a rotatable crank end connected to said piston member for rotatable actuation thereby upon movement of said piston within said chamber.

Claim 17

A fluid pressure device comprising a housing having a chamber open at one end, means connecting the open end of said chamber with a first source of fluid pressure, a piston axially slidably disposed in said chamber with one side exposed to said first source of fluid pressure and movable in said chamber in response to changes in the pressure differential across said piston, a cylinder joined to said piston and movable therewith, said cylinder having a cylinder chamber and a wall having one surface exposed to said cylinder chamber and an opposite surface of said wall exposed to said first source of fluid pressure so that saId wall moves with said piston in response to changes in the pressure differential across said wall, means for pressurizing said cylinder chamber to aid in moving said piston in one direction.

Claim 18

A fluid pressure device comprising a housing having a chamber open at one end, means connecting the open end of said chamber with a first source of fluid pressure, a piston axially slidably disposed in said chamber with one side exposed to said first source of fluid pressure and movable in said chamber in response to changes in the pressure differential across said piston, a cylinder joined to said piston and movable therewith, said cylinder having a cylinder chamber and a wall having one surface exposed to said cylinder chamber and an opposite surface of said wall exposed to said first source of fluid pressure so that saId wall moves with said piston in response to changes in the pressure differential across said wall, means for pressurizing said cylinder chamber to aid in moving said piston in one direction.

Claim 19

A fluid pressure device comprising a housing having a chamber open at one end, means connecting the open end of said chamber with a first source of fluid pressure, a piston axially slidably disposed in said chamber with one side exposed to said first source of fluid pressure and movable in said chamber in response to the changes in the pressure differential across said piston, a cylinder joined to said piston and movable therewith, said cylinder having a cylinder chamber and a wall having one surface exposed to said cylinder chamber and an opposite surface of said wall exposed to said first source of fluid pressure so that said wall moves with said piston in response to the changes in the pressure differential across said wall, said cylinder having a second cylinder chamber, a second source of fluid pressure connected with said second cylinder chamber, metering means connecting said first-mentioned cylinder chamber with said second cylinder chamber to meter pressurized fluid to said first cylinder chamber upon expansion of said first cylinder chamber to thereby aid in movement of said piston in one direction.

Claim 20

A fluid pressure device comprising a housing having a chamber open at one end, means connecting the open end of said chamber with a first source of fluid pressure, a piston axially slidably disposed in said chamber with one side exposed to said first source of fluid pressure and movable in said chamber in response to the changes in the pressure differential across said piston, a cylinder joined to said piston and movable therewith, said cylinder having a cylinder chamber and a wall having one surface exposed to said cylinder chamber and an opposite surface of said wall exposed to said first source of fluid pressure so that said wall moves with said piston in response to the changes in the pressure differential across said wall, said cylinder having a second cylinder chamber, a second source of fluid pressure connected with said second cylinder chamber, metering means connecting said first-mentioned cylinder chamber with said second cylinder chamber to meter pressurized fluid to said first cylinder chamber upon expansion of said first cylinder chamber to thereby aid in movement of said piston in one direction.