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| Number | Title | Issue Date |
| 7287541 | Method, apparatus and system for controlling fluid flow A system, apparatus and method of controlling the flow of a fluid are provided. In accordance with one embodiment of the present invention, a flow control device includes a valve having a flow path defined therethrough and a valve seat in communication with the flow... | 10/30/2007 |
| 7210720 | Timed rotation tool assembly and actuator A fluid-powered tool assembly having first and second tool members, a body, and first and second rotatable shafts. The first shaft is attached to the first tool member for rotation therewith about a first axis, and the second shaft is attached to the second tool mem... | 05/01/2007 |
| 7210665 | Actuator integrally provided with fail-safe function An actuator includes: a rotor assembly including an output shaft having a male screw portion and having a pin attached thereto, and a sleeve having a female screw portion and threadedly engaged with the male screw portion of the output shaft so as to convert a rotar... | 05/01/2007 |
| 7010993 | Universal power operator A universal power operator for shifting a movable barrier, such as a gate, and a circuit control system for operation thereof, is shown that allows the operator to be assembled for both a left-hinged or right-hinged movable barrier. The universal power operator incl... | 03/14/2006 |
| 5943910 | Telescopic ball nut and screw linear actuator and method of constucting and using it A telescopic multiple ball screw nut linear actuator has an outer screw and first nut defining a first helical ball raceway between them. The screw has a tubular portion with an axially open outer end on which a second nut is fixed. An inner screw, provid... | 08/31/1999 |
| 5919015 | Mechanical drive for a blind spline broaching machine A mechanical drive linkage for a blind spline broaching machine wherein a rotary motion provided by a servo driven helical ball or roller screw is converted to a linear reciprocal motion of a ram through the use of a kite link and a pivot link that as a p... | 07/06/1999 |
| 5865272 | Differential drive linear actuator A linear actuator having an output shaft having a pair of driven wheels mounted thereon. One of the driven wheels is rotatably mounted in a fixed plane and has a drive nut for an associated thread on the output shaft. The other drive wheel is rotatably fi... | 02/02/1999 |
| 5351797 | Retraction system for a power tool drive spindle A system for retracting the drive spindle of a power tool includes a drive shaft which has a spline portion and a threaded portion. During normal operation, the drive spindle is rotated by interconnection of a drive gear with the splined portion of the dr... | 10/04/1994 |
| 4827789 | Linear actuator A linear actuator includes a single drive gear that engages two driven gears of the same pitch diameter, which in turn drive a spindle and a sleeve, respectively. The sleeve is internally threaded to receive the spindle, which is externally threaded. The ... | 05/09/1989 |
| 4723453 | Eccentric differential screw actuating, torque multiplying and speed changing device An eccentric differential screw usable for torque multiplying, speed changing, positioning and actuating functions is disclosed. The disclosed device produces output between fixed output member positions. A rotatable shaft having threaded portions, constrained... | 02/09/1988 |
| 4593576 | Micro stepping drive An internally and externally threaded double nut is screwed onto the threaded shaft of a stepper motor. The nut is restrained from rotational motion thereby limiting it to translation along the shaft axis. An internally threaded output sleeve is screwed o... | 06/10/1986 |
| 4573566 | Dual stroke transfer drive In a ball screw transfer drive for a transfer machine, first and second carriages are translated by rotation of a ball screw, the ball screw being actuated by a DC electric or other type of variable speed motor through a ball screw drive train. The first ... | 03/04/1986 |
| 4041795 | Mechanism for converting rotary motion into precise low speed linear motion This invention relates to a device for producing precise linear movement in response to a rotary input. More particularily, the invention comprises two threaded shafts respectively having threads of different pitches, one of the shafts being secured again... | 08/16/1977 |
