Showing papers on "Actuator published in 1968"

Active fluid isolation system

Abstract: A body to be stabilized, such as an aircraft pilot seat includes means, such as an accelerometer, for providing an acceleration signal representative of the acceleration of the body. This acceleration signal is used to control the action of a servovalve-controlled hydraulic actuator, to reduce the force applied to the body tending to reduce the acceleration sensed by the accelerometer to a substantially zero value. There is also a position transducer for providing a signal representative of the displacement of the body relative to the supporting structure position to provide a displacement control signal that controls the actuator so that the mass position is normally in a predetermined rest position, typically at the hydraulic actuator midposition.

Latch release operating mechanism

Abstract: A SMALL ELECTRIC MOTOR DRIVES A GEAR TRAIN SET HAVING A LATCH RETRACTING LINK CONNECTED TO IT BY AN ECCENTRIC IN A LOST-MOTION SLOT. THE LINK OPENS THE STARTING CIRCUIT IN ITS RETRACTED POSITION, WHILE A CAM SWITCH ENGAGING ONE OF THE GEARS PROVIDES A HOLDING CIRCUIT. AN ELECTRICAL BRAKE AND OTHER INTERLOCKING CIRCUIT SWITCHES ARE ALSO PROVIDED FOR A STEERING COLUMN LATCH ACTUATOR.

Actuator useable for electric switches and the like

Abstract: An actuator assembly including spring elements unitarily formed of a flexible, resilient, synthetic resin material and driver and driven members which may be integrally formed with said spring elements to provide a new and novel integral actuator assembly capable of formation in a single molding operation and particularly adaptable for use as an electrical switch.

Electric fluid actuator

Abstract: Electric fluid actuator apparatus utilizing electrically conducting plates with a field control source whereby an electric or magnetic field is established between the plates to control the effective viscosity of fluid located therebetween. Flow of fluid within the actuator mechanism is initiated by a constant flow pumps and controlled by the field control source to establish fluid pressures acting to displace the actuator mechanism.

Hydraulic action devices with inertia insensitive snubbing circuit

Abstract: A hydraulic action device such as a buffer, actuator, and the like, comprises means defining a working chamber from which hydraulic fluid is arranged to be displaced through one or more passages by a member such as a wing shaft vane, and the like, operative under substantial load variables, and a valve is referenced directly to the working chamber independently of and in control of at least one of the passages for effecting a substantially uniform rate of deceleration of the member irrespective of load, force or inertia. Anticavitation valve means and speed control valve means may be provided.

Vane-type actuator

Abstract: The performance of a vane-type actuator or fluid motor is greatly enhanced by coating the inner surfaces of the piston chamber with Teflon-S, a material which endows the chamber surfaces with a fluorocarbon-rich surface stratum which is highly wear-resistant, nearly frictionless of nature, and self-renewing in the presence of wear, scoring or scuffing.

Fluidic adaptive spark advance system

Abstract: SPARK TIMING IN A SPARK IGNITION ENGINE IS CONTROLLED TO PROVIDE MAXIMUM ENGINE TORQUE BY UTILIZING A FLUIDIC LOGIC CIRCUIT IN COMBINATION WITH AN ACTUATOR FOR SELECTIVELY ADVANCING AND RETARDING SPARK TIMING IN RESPONSE TO FLUID SIGNALS AND A SENSOR FOR DETECTING INCREASING AND DECREASING ENGINE TORQUE. AT ANY GIVEN ENGINE SPEED THE LOGIC CIRCUIT SEEKS THE ACTUATOR DIRECTION WHICH PRODUCES INCREASING TORQUE BY PROVIDING SIGNALS WHICH MOVE THE ACTUATOR ALTERNATELY TO ADVANCE AND RETARD THE SPARK TIMING AND BY SENSING THE RESULTING INCREASE OR DECREASE IN ENGINE TORQUE. AN INCREASE IN ENGINE TORQUE CAUSES THE CIRCUIT TO CONTINUE TO MOVE THE SPARKTIMING ACTUATOR IN THE SAME DIRECTION, A DECREASE IN ENGINE TORQUE RESULTS IN A REVERSAL OF THE ACTUATOR DIRECTION. THE SPARK TIMING IS THEREFORE ADJUSTED UNTIL THE MAXIMUM TORQUE IS REALIZED AND THE CONTROL SYSTEM THEN ENTERS A LOW-AMPLITUDE MODE OF OSCILLATION ABOUT THE MAXIMUM-TORQUEPRODUCING ACTUATOR POSITION UNTIL A TORQUE VARIATION IS ONCE AGAIN SENSED.

Indicating and seal activating device and method

Abstract: A DEVICE AND METHOD USEFUL IN CONJUNCTION WITH A HYDRAULIC ACTUATOR FOR PROVIDING A SIGNAL TO INDICATE THAT A SEAL OF THE ACTUATOR HAS LEAKED FLUID AT AN EXCESSIVE RATE AND FOR FUNCTIONALLY REPLACING SUCH SEAL WITH A SECONDARY SEAL, WHICH SECONDARY SEAL IS MAINTAINED SUBSTANTIALLY INACTIVE IN THE FLUID CIRCUIT UNTIL FLUID LEAKAGE PAST THE PRIMARY SEAL EXCEEDS A PREDETERMINED AMOUNT

Direction signal and hazard warning switch assembly

Abstract: A vehicle direction signal assembly having direction signal operating means and independent hazard warning switch operating means including an actuating member movable linearly into and out of the path of a cam, rotatable in response to rotation of the vehicle''s steering mechanism, movement of the actuator being transmitted to a contact carrier movable laterally of the actuator into and out of engagement with fixed contacts, the actuator and carrier having cooperable latch means for latching the actuator in the path of rotation of the cam whereby engagement between the cam and the actuator effects restoration of the latter and the carrier to their initial positions. The direction signal operating means and the hazard warning switch actuator include cooperable means operable in response to movement of the direction signal operating means to restore the hazard warning actuator and the contact carrier to their initial positions.

Stability augmentation system

Abstract: A stability augmentation system is provided which has triple redundancy and is fail-functional. For each axis desired to be controlled, a hydraulic servocontrol mechanism is provided having three signal sources, and three actuator units. The actuator''s pistons are connected together in tandem with a relief valve connected across each piston to prevent the piston of a failed unit from hampering the operation of the control. Means are provided to furnish a feedback signal to the servovalves controlling the pistons when pressure is being relieved across the piston to attempt to balance the output of the servovalve. The hydraulic servocontrol mechanism may be combined with a hydraulic boost actuator comprising two tandem pistons having their pressure differential limited by boost relief valves and being controlled by a spool valve to provide an integrated hydraulic control actuator having a single output member. The relief valve has a slider with a conduit therein positioned between a pair of fluid channels. The conduit is closed when the slider is centered in the valve and is open when the slider is not centered. Centering plungers, held in place by hydraulic pressure, normally hold the slider in its centered position. When the pressure differential across the slider exceeds the pressure of one of the plungers, the slider moves from its centered position.

Improvements relating to camera systems

Abstract: 1,240,837. Camera support system. RANK ORGANISATION Ltd. 14 May, 1969 [16 May, 1968], No. 23341/68. Heading F4R. [Also in Division G2] Parallelogram linkages 10 and 18 are mounted on a platform 8 to allow a camera 34 or other equipment, e.g. studio lights, to be moved in the common vertical plane or rotated about a support pillar 2. The weight of the system is counterbalanced by applying forces to the additional linkage 23, 24 at suitable points such as indicated by the arrows, the forces being gravitational, pneumatic or hydraulic. The driving actuators of the system (not shown) are controlled by the operator in the cabin 30. The pillar may be strapped to the wall or roof of a studio by strut 6, and cables may be led from the wall or roof to the camera via the units 10 and 18 and a slip ring system (not shown). The linkages 10, 18 may be indirectly connected via an intermediate member (not shown).

Recording device for rotatable mixers

Abstract: A counter system including a magnetically actuatable switch housed in a protective case. The case is secured to a frame supporting a rotatable mixing drum. A magnetic actuator is resiliently mounted on the drum and is moved past and close to the switch at each drum revolution. The switch is connected through an electrical circuit to a counter so that total revolutions of the drum are measured. A second counter system measures both total and mixing speed revolutions of the drum. In this second system one counter is actuable only if the drum is turning at a preselected speed. Two switches are used and they are connected to an electrical circuit which provides a signal to the mixing counter only if the drum is turning at mixing speed.