Showing papers on "Actuator published in 1969"

Actuator assembly for toggle switch

Abstract: Actuator assembly for snap action toggle switch has a rockerlike actuator member which is pivoted on a transverse axis. A roller mounted on the actuator member is adapted to be engaged for overcenter movement of the actuator at a point spaced from the pivot axis of the actuator member by a member on the end of the toggle lever having a curved outer surface resiliently biased into engagement with the roller. By the use of a pair of curved cooperating surfaces to cause overcenter movement, at least one of which is a roller, which contact each other intermediate their respective pivot mountings, a very unstable teaseproof mounting is provided.

Motion simulator actuator joint

Abstract: A three degree-of-freedom joint for attaching the upper end of a linear actuator to the motion platform of a six degree-of-freedom motion system. The disclosed configuration combines certain features of a ball-and-socket joint with a gimbal joint to achieve advantages and allow motion excursions not attainable with conventional joints previously used in such applications.

Active vibration isolator for flexible bodies

Abstract: This disclosure is related to an active vibration control arrangement for isolating a flexible body from disturbances applied either externally or internally by inertial or other forces created by the body itself, and consists of an actuator having a movable element drivingly connected to the flexible body, controlled by a signal produced by excitatory reaction of the body together with means to produce a nullifying movement of the movable member in response to the signal.

Centrifugal actuator for limited slip differential

Abstract: A LIMITED SLIP DIFFERENTIAL MECHANISM HAVING A NORMALLY DISENGAGED MAIN CLUTCH PRODUCING LOCK-UP WHEN ACTIVATED, WHICH IS OPERATED BY MEANS OF AN ACTUATOR DEVICE IN TURN ACTIVATED BY A PREDETERMINED LEVEL OF DIFFERENTIAL ACTION WHICH IS VARIED WITH THE RATE OF CHANGE OF LEVELS OF DIFFERENTIAL ACTION THE ACTUATOR INCLUDES AN ACTUATOR MEMBER WHICH IS ROTATIONALLY DRIVEN BY DIFFERENTIAL ACTION AND UP WHICH SPRING-BIASED CENTRIFUGAL WEIGHTS ARE PIVOTALLY MOUNTED AND ARRANGED SO THAT AT A PREDETERMINED VELOCITY AND ACCELERATION OF THE ACTUATOR MEMBER ONE OF THE WEIGHTS MOVES OUTWARDLY AND APPLIES A BRAK- ING FORCE TO THE ACTUATOR MEMBER INHIBITING ITS ROTATION AN ARRANGEMENT IS PROVIDED FOR ACTUATION OF THE NORMALLY DISENGAGED MAIN CLUTCH IN RESPONSE TO THIS INHIBITED ROTATION, SO THAT THE DIFFERENTIAL ACTION IS UNINHIBITED AT LOW LEVELS OF DIFFERENTIAL ACTION A HIGH ROAD SPEED CUT OUT OF THE ACTUATOR IS ALSO PROVIDED SO THAT NO LOCK-UP WILL OCCUR AT RELATIVELY HIGH ROAD SPEEDS

Ram-air turbines

Abstract: A ram-air turbine comprises a variable-pitch bladed rotor, a hydraulic actuator for effecting pitch variation of the blading of the rotor, and a pump driven by the rotor to supply fluid for operation of the actuator. A rotary speed-sensitive flyweight governor is provided to control the supply of fluid to the actuator whereby to cause the rotor automatically to rotate at constant speed, and the arrangement includes a machine driven by the rotor. The rotor, hydraulic actuator, pump, governor and driven machine are all coaxially arranged.

Sample data web and strip guide control system

Abstract: Control system for guiding a traveling web or strip to facilitate the performance of work on the web or strip to provide strip positioning at a location remote from the strip actuator by employing a movable sensor adjacent the actuator modulating the actuator in response to a set point, and a stationary sensor at the control point generating a time sampled signal to the movable sensor for changing the set point in response to the position of the strip at the control point.

Magnetic transducer displacement control system

Abstract: A system for controlling the load force between a magnetic transducer and a magnetic medium is disclosed. The system comprises a means for sensing the force between the magnetic transducer and the magnetic medium and for developing an electrical signal in response thereto, means for producing a reference signal, means for comparing the electrical signal and the reference signal and for developing an error signal therefrom, and actuator means responsive to the error signal for displacing the magnetic transducer relative to the magnetic medium.

Disc brake with spring brake and pressure-compensating self-adjuster

Abstract: A disc brake actuator is disclosed which includes a piston for urging the brakeshoes toward a rotor and an automatic adjuster to properly position the piston in the actuator housing. The adjuster is actuated by relative movement between it and the piston and is mounted on a member that reciprocates with the piston during high-pressure brake applications thus precluding adjustment, but is held stationary during low-pressure applications to permit operation of the adjuster. Such a compensated adjuster is particularly useful when mechanical actuation is provided in addition to the usual hydraulic actuator.

Momentary flexible overload release device for a motor drive

Abstract: AN OVERLOAD RELEASE DEVICE FOR AN ELECTRIC MOTOR DRIVE WHICH INCLUDES A DRIVE GEAR ENCLOSING A PINION-CARRYING ACTUATOR AND BETWEEN WHICH ARE ARRANGED FLEXIBLE RESILIENT ROLLERS ADAPTED TO BE COMPRESSED OR DEFORMED WHEN SUBJECTED TO AN EXCESSIVE TORQUE, AND UPON RELEASE OF SUCH TORQUE, THE PARTS RESUME THEIR NORMAL DRIVING RELATIONSHIP, SPACED BEARING MEANS BEING PROVIDED BETWEEN THE ACTUATOR AND THE DRIVE GEAR TO MILITATE AGAINST CANTILEVERING OF THE BEARING SHAFT.

Friction-welded hydraulic actuator

Abstract: A hydraulic actuator is entirely assembled by means of a plurality of friction welds. The construction permits the elimination of many parts formerly necessary in such actuators, reduces, the possibility of fluid leakage, and reduces the overall length of the actuator as compared with prior art actuators having the same length of stroke.

Unitary cap and valve actuator

Abstract: The combination cap and valve actuator is molded in one piece, the actuator button being joined to the cap by a flexible strip. The valve is opened by lateral pressure applied to the strip on the side of the cap opposite the spray discharge, and during this action the forward part of the button moves under the top wall of the cap, thus requiring only a minimum interruption of the smooth top surface of the cap.

Steering and tilting systems for marine vessels

Abstract: Steering and tilting systems featuring hydraulic actuators. The steering system comprises two self-contained units including a first helm pressure generating assembly positioned as desired within the vessel and a second hydraulic rotary actuator assembly suitably mounted to the vessel guidance system. The tilting system also comprises two self-contained units including a first motor driven hydraulic pump positioned as desired within the vessel and a second hydraulic actuator assembly suitably mounted to the underwater propulsion system.

Fluidic position limit control

Abstract: A position limit control for incorporation into a feedback control system is disclosed which includes an actuator for positioning a control element and wherein it is desirable to provide variable limits on the minimum and maximum position of the actuator. The position limit control comprises function generators for providing fluidic upper limit and lower limit signals, a feedback transducer for providing a fluidic signal proportional to actuator position, means for placing the actuator position signal and the lower limit signal in opposition with each other across the control ports of a first fluid amplifier, means for placing the actuator position signal and the upper limit position signal in opposition with each other across the control ports of the second fluid amplifier, and means for overriding the closed loop control system with the output signals from the said fluid amplifiers. Also disclosed are a unique fluidic function generator for providing a fluidic differential pressure signal and specific override means.

Top lift actuator

Abstract: An actuator for a collapsible top of a vehicle comprising a compact arrangement of series connected planetary or epicyclic gear sets including a fixed ring gear common to all sets serving as a pivot mounting for an actuating arm.

Brake system for electrical motors

Abstract: In a capacitor start motor, a centrifugal actuator, acting upon a balanced but floating plate serves a double function of startwinding switch actuator and mechanical brake. A switching arrangement provides smooth dynamic braking until the mechanical brake is actuated.

Application of d.c. linear machines as short-stroke and static actuators

Abstract: An actuator is described which is suitable for short-stroke and static applications based on the use of a d.c. linear motor, without the need for a commutator. For such an arrangement, the output-force/displacement characteristics are calculated and the analytical results are shown to compare favourably with experimental results obtained on 2-pole and 3-pole machines. A simple form of control of force/displacement characteristics, based on the use of a graded armature winding, is described. Results are included for such an actuator designed for mechanical valve operation. The results obtained indicate that the d.c. linear actuator is an attractive alternative to the linear-induction actuator, particularly in applications where ease of control is a primary factor.

Cavity Formation in Valve Controlled Hydraulic Cylinders

Abstract: Solutions are developed of the non-linear equations describing the response of a valve driven hydraulic actuator to step inputs. Compressibility is neglected but cavitation is taken into consideration. It is shown that under certain conditions cavities can exist on both sides of the actuator piston. It is argued that there is no good reason why hydraulic servos should not be operated in a cavitating mode. The effects of cavitation on dynamic response and the possible effects of cavitation damage are discussed.

Linear induction motor stator assembly

Abstract: To control the thrust and hence the acceleration produced by a linear induction motor, an actuator is provided to vary the gap between the stator and the cooperating linear induction motor reaction rail A tracked air cushion vehicle is shown propelled by a double sided linear motor In one arrangement the stator has two parts which are disposed one on either side of the reaction rail, the stator parts are pivoted and a hydraulic actuator can pivot them apart In another arrangement where the stator has two parts, the stator parts remain parallel to each other as the actuator moves them apart

Push-pull,cable-type actuator for use at high temperatures

Abstract: A push-pull, cable-type actuator for use at high temperatures comprises a flexible metal sheath and a flexible metal core mounted for sliding longitudinal movement in the sheath. The sliding surfaces of both sheath and core are comprised of a precipitation hardening steel fabricated in a soft condition and hardened by swaging and heat treating to a condition in which the meeting, rubbing surfaces will not spall during use of the actuator at high temperatures.

Actuator mounting assembly for telescopic parts

Abstract: AN ACTUATOR MOUNTING ASSEMBLY FOR TELESCOPIC PARTS IN WHICH MOUNTING BLOCKS ARE POSITIONED AROUND THE BODY OF THE ACTUATOR AND AT SPACED POINTS ALONG THE SAME AND RIGIDLY MOUNT THE ACTUATOR IN A TELESCOPIC PART SUCH THAT THE BODY OF THE ACTUATOR FLEXES WITH THE FLEXURE OF THE TELESCOPIC PART TO MAINTAIN ALIGNMENT OF PISTON AND CYLINDER WALLS.

Pneumatic operating means for a valve

Abstract: A PNEUMATICALLY OPERATED VALVE ACTUATOR EMPLOYS A CENTRALLY LOCATED PISTON ROD WHICH IS SLIDABLY SUPPORTED OVER A SUBSTANTIAL LENGTH OF ITS TRAVEK BY UPPER AND LOWER GUIDING RAILS OR TRACKS AND WHICH IS MOVABLE IN RESPONSE TO THE RECEIPT OF FLUID OPERATING PRESSURES WHICH ARE DIRECTED SIMULTANEOUSLY THROUGH TWO BRANCHES OF A FLUID CIRCUIT INTERNALLY OF THE ACTUATOR AND AGAINST THE FACES OF A PAIR OF OPPOSITELY DISPOSED PISTONS CARRIED BY THE PISTON ROD SO THAT THE BRANCH FLUID CIRCUITS COOPERABLY POWER THE ACTUATOR. TOTAL PISTON AREAS MAY BE VARIED BY CHANGING OR ELIMINATING CYLINDERS. ADDITIONALLY, THE ACTUATOR MAY BE EMPLOYED FOR PLACING ITS CORRESPONDING CONTROLLED VALVE IN A DESIRED FULLY OPEN OR FULLY CLOSED POSITION IN RESPONSE TO AN ALARM CONDITION BY A BIASING ARRANGEMENT HAVING SPRING MEANS WHICH IS LOADED BY OPERATION OF THE ACTUATOR. THE ACTUATOR IS PREFERABLY CONSTRUCTED PRIMARILY OF PLASTIC COMPONENTS TO MINIMIZE FRICTION AND PROVIDE FOR EASE IN FORMATION OF THE FLUID CIRCUITS THEREIN.

Print hammer and actuator construction for high speed printers

Abstract: A PRINT HAMMER ACTUATOR ASSEMBLY FOR HIGH SPEED PRINTERS. TWO ELECTROMAGNETICALLY ENERGIZED ACTUATOR CONSTRUCTIONS ARE PROVIDED, WHICH ARE MECHANICALLY EQUIVALENT BUT OF COMPLEMENTARY GEOMETRY SO THAT THEY CAN BE LOCATED TOGETHER IN A MANNER FACILITATING INDIVIDUAL REMOVAL OF THE ACTUATORS. THE ACTUATORS ARE LOCATED IN DIREACTIONS PARALLEL TO THE LINE OF PRINT BY ALIGNMENT COMBS FASTENED TO A BASE PLATE, AND LOCATED IN DIRECTIONS NORMAL TO THE LINE OF PRINT BY STOP BARS FASTENED TO THE BASE PLATE.

Actuator and signal device for a lifting magnet

Abstract: An electromagnet-lifting device employed to remove metallic charging hole covers includes a movable actuator member that has a length greater than the thickness of the magnet. When the bottom surface of the magnet is positioned on top of a charging hole cover the actuator is displaced upwardly relative to the magnet and closes a switch in the circuit to energize the magnet and engage the charging hole cover. A relay in the circuit closes a separate switch in another circuit to actuate a signal device that indicates the charging hole cover is engaged by the lifting device.

Braking and sequencing mechanism

Abstract: A mechanism for an exposure control system operative to sequentially control effective aperture and exposure interval. The mechanism features an actuator component which is operative to perform exposure mode sequencing in addition to actuating an aperture diaphragm brake. The actuator component is configured to operate codirectionally with the actuating portion of the brake assembly. This codirectional operation permits a high and repeatable responsiveness necessary to proper operation of the exposure control system. The actuator component also is operative to actuate any necessary switching of the control system when it is altered from an aperture regulating mode to an exposure interval regulating mode.