Pneumatic actuator
AssigneeNorgren Limited
InventorNorbert Giesen
Life of this patent
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Abstract
A pneumatic actuator (100) is provided according to the invention. The actuator (100) comprises an actuator body (102) and a piston rod (108) extending from the actuator body (102). The piston rod (108) moves over an actuation span. The actuation span comprises a first stroke span that is traversed by the piston rod (108) at a first actuation speed and a second stroke span that is traversed at a second actuation speed that is substantially slower than the first actuation speed.
Claims35
A pneumatic actuator (100) comprising an actuator body (102) and a piston rod (108) extending from the actuator body (102), with the piston rod (108) moving over an actuation span, with the pneumatic actuator (100) being characterized by:
- a piston ring (110) located in an outer shell (101) and below a piston (120), with the piston ring (110) slidably located in the outer shell (101) and being configured to sealingly slide on the piston rod (108), wherein port E is located below the piston ring (110) and the piston ring (110) moves up and pushes the piston (120) upward when pressurized gas is introduced into port E;
- a first stroke span that is traversed by the piston rod (108) at a first actuation speed;
- and
- a second stroke span that is traversed at a second actuation speed that is substantially slower than the first actuation speed.
A pneumatic actuator (100) comprising an actuator body (102) and a piston rod (108) extending from the actuator body (102), with the piston rod (108) moving over an actuation span, with the pneumatic actuator (100) being characterized by
- a piston ring (110) located in an outer shell (101) and below a piston (120), with the piston ring (110) slidably located in the outer shell (101) and being configured to sealingly slide on the piston rod (108), wherein a port E is located below the piston ring (110) and the piston ring (110) moves up and pushes (120) upward when pressurized as is introduced into port E;
- a first stroke span that is traversed by the piston rod (108) using a first actuation force;
- and
- a second stroke span that is traversed using a second actuation force that is substantially greater than the first actuation force.
A pneumatic actuator (100), comprising:
- an actuator body (102) comprising an outer shell (101) and an inner shell (109);
- a piston (120) slidably located in a piston chamber (126) in the inner shell (109);
- a ram (160) slidably located in the outer shell (101) and configured to move at least partially into the inner shell (109);
- a movable ring (140) slidably located in a ring chamber (147) located be the inner shell (109) and the outer shell (101);
- a hydraulic fluid located in a region between the ram (160), the piston (120), and the movable ring (140);
- a piston ring (110) located in the outer shell (101) and below the piston (120), with the piston ring (110) slidably located shell (101) and being configured to sealingly slide on the piston rod (108), wherein a port E is located below the piston ring (110) and the piston ring (110) moves up and pushes the piston (120) upward when pressurized gas is introduced into port E;
- wherein upward movement, of the movable ring (140) forces the piston (120) downward over a first stroke span due to movement of a first volume of the hydraulic fluid from the ring chamber (147) into the piston chamber (126);
- and
- wherein downward movement of the ram (160) forces a second volume of the hydraulic fluid down into the piston chamber (126), wherein the downward movement of the ram (160) forces the piston (120) downward over a second stroke span.
Dependencies are inferred from the claim text.