Abstract: A disposable rupturable shipping and installation strap holding in a retracted position the output member of a linear actuator such as a pre-filled pre-bled hydraulic actuator. The strap has a retaining member fitted over the end of the actuator output member and a pair of symmetrically disposed strips or bands integrally formed with the retaining member and attached at their other end to a portion of the actuator housing. The strips or bands have portions of reduced strength which cause the strap to break and free the actuator output member upon first operation of the actuator. Preferably, the strap is molded of relatively thin flexible plastic.

Abstract: A feedback system is disclosed for use in a remote control linear actuator device including a pair of actuator members that are relatively linearly displaceable by a motor, which feedback system includes a mounting bracket connected with one of the actuator members, a slide bar connected with the mounting bracket for linear movement by the other actuator member in a direction parallel with the direction of relative movement of said actuator members, and a rotary member operable by the slide bar to supply a feedback signal to the motor that is a function of the relative positions of the actuator members.

Abstract: The shorted turn in the linear actuator is analyzed using a transformer circuit model. Formulas are developed to calculate the transient response of the coil current in terms of the geometry. Results obtained by modeling compare favorably with experimentally obtained results.

Abstract: A linear actuator for rotating a load, such as an antenna, in which the load is pivoted about a load pivot axis and a drive point on an arm extending from the load is driven along a path of travel defined by a frame pivoted about a frame pivot axis parallel to the load pivot axis and normal to the path of travel, the load pivot axis being equally distant from the drive point and the frame pivot axis. The structure of the linear actuator reduces loss of moment arm at the extremes of travel and minimizes stress on the components of the actuator.

Abstract: An apparatus (102; 104; 106; 108; 110; 112) for locking of an inertial mass drive hydraulic circuit system (100) having a hydraulic pump (2), actuator means (1) driven by the hydraulic pump for driving a relatively large inertial mass, and a directional control valve (4) mounted in line means (5, 12, 13) connecting the hydraulic pump with the actuator means. On-off means (34, 35; 44, 45; 54, 55; 64, 65; 74, 75; 345) is interposed between the actuator means and the hydraulic pump for opening or closing the line means (12,13), and means (30, 31, 37; 40; 51; 61, 63; 70, 71, 77, 78) is provided for sensing the discharge condition of the hydraulic pump (2). The sensing means generates a signal for actuating the on-off means.

Abstract: An hydraulic linear actuator having a linearly driven piston (16) in which a mechanism (32) is incorporated within the actuator and coupled to the piston (16) to produce rotation of a member (34) proportional to piston displacement, and a rotational position sensor (42) is incorporated within the actuator to sense the rotation of said member (34).

Abstract: This disclosure depicts a novel apparatus for use with an electric limit switch. The apparatus is a neutral position limit switch lever head, or multiple position off-center to center movement translator, for use with an operator having first and second movable elements and a receiver having a movable member. The apparatus comprises a support cover, a linear actuator in contact with the movable member of the receiver and a tri-lobe roller follower in contact with the linear actuator and the two movable elements of the operator. The support cover retains the linear actuator in the center of the support cover and also holds the tri-lobe roller follower in position. The novel apparatus converts the off-center movement of the movable elements of the operator to a linear center movement of the linear actuator.

Abstract: PURPOSE:To obtain a moving coil for actuator suitable for mass production and being possible to be driven with a low voltage by a method wherein plural conductive patterns are formed on a flexible resin film placing the electrically insulating distance with each other, and after both end parts thereof are connected in parallel with electrodes, the film is formed in a cylindrical shape. CONSTITUTION:The plural lines of conductor patterns 10 of copper foil, etc., are formed nearly in parallel placing respectively the electrically insulating distance on the surface of the resin film 9 having heat resistance and sufficient flexibility. At this time, formation of the patterns 10 is performed by printing or etching, and breadth of the patterns is changed according to the place as occasion demands. Then both the end parts 11, 12 of the patterns 10 are connected in parallel with the lines broader than the patterns 10 to form the electrode parts. The film 9 is wound next in a cylindrical shape having the prescribed diameter to make the moving coil for linear actuator. Accordingly because electric resistance is reduced by forming the patterns 10 in parallel, driving with a low voltage becomes as possible and producibility can be enhanced.