Abstract: A switch lever for use with a centrifugal starting switch of an electric motor. The starting switch has at least one switch contact which is moveable, in response to axial movement of a centrifugal actuator, between a start position in which a starting winding of the motor is energized and a run position in which the starting winding is de-energized. The switch lever of the present invention operatively connects the switch contact with the centrifugal actuator for movement in response thereto. The switch lever has a cam follower at one end which is engageable with an annular actuator collar of the centrifugal actuator. The cam follower includes a contoured rear cam face which prevents the cam follower from becoming "stuck" behind a flat rear surface of the actuator collar during assembly or operation of the motor.

Abstract: A terminal board for a dynamoelectric machine is mounted to an end-shield of the machine. The terminal board has securing means for fixing an electrical switch to the terminal board using a single conventional fastener. A second snap-in arrangement is provided in place of additional fastener. The terminal board includes an arm spaced from the fastener hole. The arm is spaced above a surface of the terminal board and defines a slit with the terminal board through which an ear of the switch extends. A finger extends down from a free end of the arm to define a stop which maintains the switch ear in the slot. The finger and the single fastener together fix the switch to the terminal board.

Abstract: A centrifugal switch assembly for a single phase induction motor connecting a start winding and/or start capacitors in circuit. A centrifugal actuator positions a contact unit on a cantilevered spring arm relative to an aligned fixed contact unit. Each contact unit is identically constructed with a cylindrical steel base and an outer contact button which defines a radial lip. A silicone rubber boot in the form of a tubular member having similar thick end hubs connected by a thin-wall convolution between the hubs to establish a flexible enclosure. The hubs are telescoped respectively over the contact bases with the same interference fit to totally enclose the contact units. The lips of the contact buttons lock the boot to the contact units. The boot length is greater than the spacing of the open contact units and the convolution is continuously deflected to create a closing force.

Abstract: A terminal board assembly for a dynamoelectric machine, adapted for supporting an overload device, comprises a body and an overload device support integral with the body and extending therefrom for cradling the overload device when the overload device is supported on the terminal board assembly. The body and the overload device support each include apparatus releasably secured in engagement with the overload device for retaining the overload device against displacement from the overload device support.

Abstract: A centrifugal actuator for mounting on a rotor shaft, the actuator being capable of movement from a first or start position to a second or run position, is provided having a base portion with a pair of opposed, mirror image actuator levers biased towards the first position. The levers are urged to the second position by centrifugal force when the shaft rotates. The levers are cooperatively connected to a sleeve, the sleeve being capable of axial movement allowing the sleeve to move from the first to second position in response to the movement of the levers. The sleeve has a collar and a shoulder portion for the seating of the actuator levers. Unique ramp structures extending from the sleeve collar to the seats on the shoulder cause the actuator levers to seat properly during assembly thereby allowing automated assembly and preventing field failure due to misseating of the actuator arms.

Abstract: A dust proof electric switch is provided for use in a dynamoelectric machine employing a centrifugal acuator having a terminal board with a cup formed therein in which a fixed contact point and terminal are mounted. A pivotable switch arm having a contact point attached thereto is mounted to the arm and extends above and cantilevered across the terminal board so that pressure on the switch arm from the centrifugal acuator causes the contact points to touch thereby closing the circuit. An open ended, resilient, flexible boot is affixed to the cup and extends upward between the terminal board to snuggly abut the switch arm and completely enclose the contact points when they are touching and when they are apart thereby protecting the contact area from dust and debris as well as containing sparks within the boot. The terminal board contains stops which serve to maintain alignment of the switch arm.

Abstract: A centrifugal switch assembly for a single phase induction motor connects a start winding and/or start capacitors in circuit. A centrifugal actuator positions a contact unit on a cantilevered spring arm relative to an aligned fixed contact unit. Each contact unit is identically constructed with a cylindrical steel base and an outer contact button which defines a radial lip. A silicone rubber boot in the form of a tubular member having similar thick end hubs connected by a thin-wall convolution between the hubs to establish a flexible enclosure. The hubs are telescoped respectively over the contact bases with the same interference fit to totally enclose the contact units. The lips of the contact buttons lock the boot to the contact units. The boot length is greater than the spacing of the open contact units and the convolution is continuously deflected to create a closing force.

Abstract: A centrifugal actuator assembly adapted to be mounted on a rotatable shaft, the assembly including actuating levers responsive to the rotational speed of the shaft, guide means to guide the levers in a predetermined inward and outward path during movement between first and second spaced positions and positive positioning and limiting structure cooperative with the levers to positively position the levers for actuating operation and to limit their movement in the event of departure from such predetermined positively positioned path at both first and second spaced positions.

Abstract: A dynamoelectric machine has a housing, a terminal board and a stationary assembly including a winding with a set of leads. The terminal board has a pair of opposite faces with a peripheral portion therebetween and a set of separate recesses in the peripheral portion. The recesses define with the housing a set of separate passages for receiving at least the winding leads.

Abstract: A dynamoelectric machine has a stationary assembly with a winding thereon, and a rotatable assembly is supported by the stationary assembly and associated in magnetic coupling relation with the winding. A switch and terminal assembly is mounted to the stationary assembly, and a centrifugal device is conjointly rotatable with the rotatable assembly for operating the switch and terminal assembly to control the energization of the winding.

Abstract: A switch assembly for selectively engaging and disengaging contacts connected to electrical machinery such as the windings for an electric motor including a pair of conductive members having insulated base portions and flexible cantilevered portions extending outwardly therefrom, each carrying one of a pair of spaced opposed electrical contacts, with one cantilevered portion of the conductive members being shorter and stiffer than the other to enhance rolling wipe-action of the pair of contacts when engaged.

Abstract: A terminal board for a dynamoelectric machine has a body with a pair of opposite faces. At least one terminal secured to the body includes an electrical connector section extending beyond one of the opposite faces and a deformed end section generally opposite the electrical connector section arranged in spaced apart relation with the other of the opposite face. A switch element is conductively secured to the deformed end section of the at least one terminal and extends in overlaying spaced relation with the other opposite face for switching between a set of switching modes.

Abstract: A governor and motor assembly of a fractional horsepower electric motor adapted to control the efficient operation of the motor utilizing simple structural components. The governor is responsive to the centrifugal forces of the rotating rotor shaft of the motor and is attached to the end thereof. The governor includes a carrier plate affixed to the shaft and a pivotable lever mounted within a groove in the carrier plate. A first end of the pivotable lever is connected to the carrier plate by an extension spring which acts to move the lever to its at rest or actuated position. As a predetermined rotational velocity is reached, the lever pivots at the groove to pivot away from the electrical switch aligned axially with the rotor shaft. The electrical switch, in turn, is mounted to a terminal board fixedly mounted to the motor housing to thereby positionally maintain the governor on the motor shaft as well as retain the associated capacitor.

Abstract: A method of assembling a dynamoelectric machine having an outboard switch compartment established at least in part by an end frame, an axially movable switch operating mechanism, and a switch assembly. In this method, the switch assembly is positioned in overlaying relation with respect to the switch operating mechanism and the end frame, and a preferred mounting height is determined for the switch assembly with respect to the switch operating mechanism and the end frame. The switch assembly is then fastened in place at the preferred mounting height.

Abstract: A centrifugal switch assembly for a single phase induction motor connects a start winding in circuit to start the motor. A centrifugal actuator positions a movable contact on the end of a cantilevered spring arm relative to an aligned fixed switch carried by an insulating flat plate secured within the motor. A silicone rubber boot in the form of a tubular member has a first heavy end telescoped over the movable contact with a resilient gripping of the side of the contact. The opposite end of the boot is a heavy end which is freely telescoped over the opposite contact into engagement with the flat plate to totally enclose the contacts, but may also be attached to the contact with a resilient grip. The boot has an intermediate convolution between the two ends. The convolution is formed as a very thin wall to establish a highly flexible but supporting wall member.

Abstract: A switch and terminal assembly has a casing, and a plurality of terminals are associated with the casing with some of the terminals defining switch terminals extending both interiorly and exteriorly of the casing, respectively. A pair of switch elements associated with the switch terminals interiorly of the casing are operable generally for switching between a pair of switching modes. A pair of actuators pivotally movable in the casing are operable generally for effecting the operation of the switch elements between the switching modes thereof and include a pair of levers extending exteriorly of the casing for receiving an applied force to effect the pivotal movement of the actuators and the operation thereby of the switch elements respectively.

Abstract: A switch assembly for use with a centrifugal actuator in the start winding circuit of a dynamoelectric machine (1). The switch has a pair of electrical contacts (29, 33) contained in a pliable, bellows-like enclosure (37) for protection from foreign matter. The assembly includes a terminal board (19) having an electrically conductive post (28) mounted thereon and comprising one side of the switch. A second contact, comprising the other side of the switch, is directly above the first and is surrounded by an electrically conductive cap (32). The cap is affixed between the ends of an electrically conductive, cantilevered switch arm (16) which is biased against a vertically rigid, horizontally adjustable stop (45). The stop has one end rigidly mounted to the terminal board and its other end above and in contact with the switch arm where the cap is affixed to the arm. The bias is caused by the switch arm support structure at the fixed end being attached to the terminal board at an angle.

Abstract: A pressure switch for monitoring a tire pressure of a motor vehicle tire is fastened to a wheel rim and is actuated by the inflating pressure in the tire. The pressure switch comprises a reference pressure chamber which is sealed off by an electrically conductive switching diaphragm in the direction of the tire, and carries a contact pin interacting with this diaphragm. The switching diaphragm has a mass which is controlled as a function of centrifugal force in response to tire rotation such that the switching point of the pressure switch can be changed automatically as a function of vehicle speed.

Abstract: An auxiliary winding cut-out switch for a sump pump motor having main windings and auxiliary windings. Controlled deflection means for positioning a contact carried on a terminal movable arm with respect to a fixed contact comprises a plunger, actuator, removable coil compression return spring and removable coil compression take-up spring, all concentric and colinear. The plunger slides in housing guide means and has a follower portion for following contact with a control surface carried on the motor rotor and axially movable responsive to rotor speed. The actuator slides in the housing guide means and has an offset coupler engaging the terminal movable arm. The take-up spring is seated between plunger and actuator; the return spring is seated between housing cover and actuator. The springs are electrically unconnected to the terminals.

Abstract: A governor and motor assembly of a fractional horsepower electric motor adapted to control the efficient operation of the motor utilizing simple structural components. The governor is responsive to the centrifugal forces of the rotating rotor shaft of the motor and is attached to the end thereof. The governor includes a carrier plate affixed to the shaft and a pivotable lever mounted within a groove in the carrier plate. A first end of the pivotable lever is connected to the carrier plate by an extension spring which acts to move the lever to its at rest or actuated position. As a predetermined rotational velocity is reached, the lever pivots at the groove to pivot away from the electrical switch aligned axially with the rotor shaft. The electrical switch, in turn, is mounted to a terminal board fixedly mounted to the motor housing to thereby positionally maintain the governor on the motor shaft as well as retain the associated capacitor.

Abstract: When operating a synchronous machine as a synchronous generator, a suppression resistor is required across the main generator field. However when operating the synchronous machine as an induction motor, a current is induced in the main generator field which is typically greater than the current carrying capability of the suppression resistor.In order to overcome the foregoing problem, the present invention provides a centrifugally activated switch for mounting on a rotor and which provides an alternate current path for the induced current.

Abstract: The switch element for triggering a cut off or control function is accommodated in a shaft (1), for example of a speed monitor. A spring-loaded release bolt (2) is surrounded coaxially by a compensating bush (4) which has a compensating ring (15), a spring plate (13) and a hub tube (14) and the center of gravity (S.sub.Kb) is such that, when the shaft (1) rotates, it compensates the centrifugal force, acting as an additional force to the spring prestressing force, of the spring half adjacent to the spring plate (13) and having the center of gravity (S.sub.F/2).

Abstract: A method of manufacturing a switch assembly for an electric motor having a switch operating mechanism for actuating the assembly. The assembly including a switch actuator having at least one slot therein, a switch arm support having an elongate channel and a switch actuator accommodating distal portion, and at least two switch arms having contacts thereon. To practice this method, the actuator is disposed along the distal portion, and one of the switch arms secured to the support is positioned along the elongate channel in overlaying relation with the actuator so as to be laterally confined by the actuator slot. Another of the switch arms secured to the support is positioned in overlaying essentially parallel relation with the one switch arm so as to be laterally confined by the actuator slot.

Abstract: The invention is directed to a rotational speed sensing switch which provides a variable linear displacement of an output member in response to a varying speed rotational input. The switch includes a sensing means, which includes a rotatable rolling element-and-ramp assembly, acting in cooperation with a signaling means which includes an axially movable actuating disc, an output member comprising a switch rod, and a biasing means. The aforementioned improvement over the prior art comprises a regulating means included within the sensing means.

Abstract: A starting switch assembly integrally formed with a terminal connection board designed to selectively engage and disengage contacts for electrical machinery such as the windings for a dynamoelectric machine, the switch assembly including opposed contacts shaped and movable relative each other to provide rolling wipe-action contacting motion when actuated into contacting engagement to minimize contact wear, the contacts being yieldingly and resiliently maintained in selected engagement when so actuated to accommodate for machinery impact and vibration.

Abstract: A switch assembly integrally formed with a terminal connection board for selectively engaging and disengaging contacts connected to electrical machinery such as the windings for a dynamoelectric machine, the switch assembly including opposed contacts shaped and movable relative each other to provide rolling wipe-action contact wear, one of the contacts being mounted on a flat conductive member having an arm portion extending laterally to one side thereof which is engaged by and is actuable by a switch arm mounted on the terminal board.

Abstract: A single phase induction motor starting and automatic reversing switch has two pairs of springy vertically spaced apart switch blades supported in opposed cantilever fashion on an insulating base. Each pair consists of an upper blade and a lower blade. A nominally stationary contact is mounted in spaced relation above each upper blade and below each lower blade. Opposite ends of the motor starting winding are connected in common between the upper and lower stationary contacts. A shaft of insulating material with a lever at one end operates the switch. The shaft extends between the vertically spaced apart blade pairs and has axially displaced oppositely radially extending arms, one between one pair of blades and the other between the other set of blades. Turning the operator shaft in a first direction causes one arm to press a blade against one upper stationary contact and the other arm to press a blade against one lower contact.

Abstract: A centrifugal actuator assembly adapted to be mounted on a rotatable shaft, the assembly including actuating levers responsive to the rotational speed of the shaft, guide means to guide the levers in a predetermined inward and outward path during their movement between first and second positions and safety structure cooperative with the levers in the event of lever departure from such predetermined path to prevent further outward movement of the levers.

Abstract: A housing with a relatively open end contains an electric motor starting switch. A plurality of terminals are secured to the housing and are disposed adjacent its relatively open end. A plug having a plurality of conductors for making electrical contact with the terminals is insertable in the relatively open end of the housing. A grounding buss is secured to the exterior of the housing and has a latching lug formed integrally therein. A mating latching mechanism is formed on the exterior of the plug to latch the plug to the housing when the plug is inserted in the relatively open end of the housing.

Abstract: A starting switch assembly for an electric motor having a run winding, a starting winding, and a centrifugal actuator. The starting switch assembly includes a first enclosed switch electrically insertable between an electric motor starting winding and a power source to control the application of power to the starting winding. A second enclosed switch is also included, each of the first and second enclosed switches having its own housing for protecting the interior thereof from environmental particles such as lint. The first and second enclosed switches are mounted in a predetermined geometrical relationship and the assembly includes an actuating link responsive to an electric motor centrifugal actuator for simultaneously actuating the first and second switches. The first and second enclosed switches are mounted on a base by a relatively open frame which extends from the base to support the first and second exposed switches in the predetermined geometrical relationship.

Abstract: A centrifugal switch for preventing overspeed of a rotary shaft driven by an electrical motor is arranged to open the electrical circuit to the starting windings at a predetermined speed of rotation. A split slip ring arrangement is engaged by metallic conducting elements urged into the conductive position by a compression means, which, when the compressive force is overcome, allows the contacts to move outward from the slip ring, to break the electrical contact. The critical rotational speed can be readily adjusted by changing the weight of the metallic conducting elements or by changing the tensile force of the compression spring.

Abstract: Motor has outboard switch compartment with components therein such as a capacitor, thermal protector, terminal board, motor circuit controlling switch assembly, a manual switch, a thermal plastic molded cover for the compartment fastened with axially directed screws, and an optional rain shroud positively positioned on the end shield. The switch assembly is designed to have accurate contact alignment which will be maintained over the life of the switch; a wiping action of the contacts; a high amount of contact travel in terms of percentage of switch actuator travel; protected contact blade arms; and a multiple height mounting feature which assures a more optimum location of the switch at final assembly with respect to the location of the switch operating mechanism. Switch arms are essentially parallel and have contacts positioned directly in line with the actuating line of a switch actuator and an operating mechanism.

Abstract: Apparatus and system for terminating the winding wires of a dynamoelectric machine (e.g., a fractional horsepower electric motor) is disclosed in which wires (referred to as magnet wires) constituting the coils of the windings of the dynamoelectric machine are terminated in an electrically insulative block fixedly secured to the core of the motor. The magnet wires from the windings of the motor are fitted into respective receptacles of the terminal block and magnet wire terminals are forceably inserted into the receptacles so as to make electrical contact with the magnet wires and so as to securely hold the magnet wires within the terminal block.

Abstract: An electric power machine, particularly an angle grinding tool is provided with a centrifugal overspeed protecting device including a fly weight in the form of a severing blade which interrupts a power supply conduit when the rotary speed of the machine is excessive. The protective device includes a cylindrical housing attached face to face to the shaft of the electric motor. The severing blade is in the form of a quadrangular frame defining a center opening. The cylindrical housing is provided with a diametric through bore of a rectangular cross-section matching the frame-like severing blade. A blind bore of a circular cross-section is coaxially superposed on the rectangular through bore and its upper part is formed with inner thread for receiving a setting screw. A helical tensioning spring is inserted in the center opening of the frame-like severing blade and rests on the bottom of the blind bore to urge the centrifugal severing blade against the setting screw.

Abstract: An integral dual terminal assembly for the starting switch of a fractional horsepower induction motor is disclosed in which the dual terminal has a pair of fixed contact supports carrying fixed electrical contacts within the housing of the starting switch in a predetermined spaced relation with a jumper bus extending between the fixed contact supports such that the fixed contacts are electrically common relative to one another.

Abstract: A device for sensing wheel rotation includes a cylindrical casing with a frusto-conical bottom end which defines a ramp for a steel ball in the casing; a shaft connected to the casing top for rotation by a vehicle wheel to cause the ball to ride up the ramp; a pair of annular contacts at the bottom of the ramp which are electrically interconnected by the ball when the wheel and consequently the shaft and casing stop rotating, whereby an electrical circuit including the contacts is closed to provide a signal indicating that rotation of the wheel has ceased.

Abstract: A prime mover adapted for selective energization across a power source. The prime mover has a winding circuit, a rotatable assembly, and an electrical switch including a housing, a first pair of switch means adapted for connection in circuit relation with the winding circuit, and a second pair of switch means adapted for connection between opposite sides of the power source. A pair of camming means is movable in the housing for engaging and actuating the first and second switch means pair and has a force receiving portion exteriorly of the housing. A speed responsive system is associated with the rotatable assembly and the force receiving portion for moving the camming means to effect the operation of the first and second switch means pairs.

Abstract: Apparatus and system for terminating the winding wires of a dynamoelectric machine (e.g., a fractional horsepower electric motor) is disclosed in which wires (referred to as magnet wires) constituting the coils of the windings of the dynamoelectric machine are terminated in an electrically insulative block fixedly secured to the core of the motor. The magnet wires from the windings of the motor are fitted into respective receptacles of the terminal block and magnet wire terminals are forceably inserted into the receptacles so as to make electrical contact with the magnet wires and so as to securely hold the magnet wires within the terminal block.

Abstract: A motor starting switch including a pair of auxiliary switches operable in response to the stopping of the drive motor of an electrical appliance or the like for disconnecting both sides of an electrical load in the appliance (e.g., for disconnecting a heating element) from the input power lines thereby to reduce shock and fire hazards of the appliance due to a short circuit of the load when the appliance is turned off, and for automatically connecting the load to the input lines of the appliance in response to start up of the motor.

Abstract: An overspeed trip mechanism for a rotating shaft has a collar mounted on the shaft. An eccentric ring surrounds and is connected to the collar for rotation therewith. A trip member is located exteriorly of the collar. The eccentric ring is movable radially relative to the collar between a first position spaced from the trip member and a second position in contact therewith. A spring is arranged between the ring and the collar to yieldably urge the ring into its first position.

Abstract: A safety device for preventing overspeed of a rotary shaft driven by an electrical motor is arranged to cut a portion of an electrical circuit feeding the motor with electrical power, by making a cutter received in a rotary member jump up or protrude by a centrifugal force acting on the cutter, so that dangerous overspeed is prevented. The cutter is movably received in a radial bore made in the rotary member, and receives a tensile force from a coil spring which is fixedly supported by the rotary member at one end of the spring. An adjusting screw, which is a cylindrical member, is provided for biasing the cutter against the tensile force from the spring. A critical rotational speed, above which the cutter jumps to break the electrical circuit, can be freely adjusted by changing the position of the adjusting screw. The change in position of the adjusting screw results in both the change of an eccentric distance of the cutter and the change of the tensile force of the spring.

Abstract: A centrifugal motor switch includes a base plate having a U-shaped fixed contact bracket and a leaf spring contact unit mounted to one side. The plate is mounted adjacent the field winding. The leaf spring is a flat rectangular spring plate including side deflection arms extending from a mounting strip and coupling arms connected to the deflection arms and to a central contact arm which extends outwardly. A wear pad is secured to the deflection arms and abutts the base plate to deflect the spring plate and locate the contacts. The contacts are secured to the fixed support and contact arm. A tab projects from the contact arm to the pad to minimize contact vibration. The bracket is formed of magnetically conductive metal and has side walls partially enclose the contact. A centrifugal operator on the shaft engages the pad and causes axial movement of the pad and spring plate with a rocking motion to rock the contacts.

Abstract: A switch assembly for a dynamoelectric machine is provided with a protected switch contact for preventing foreign matter from affecting switch contact operation. Preferably, the assembly includes a support. A plurality of electrical connections are attached to the support. The switch assembly functions as an interface permitting connection of an external source of power to the dynamoelectric machine. The protected contact is a part of the start winding circuit and the protective device preferably includes a cap structure having a closed bottom and an open top. A second electrical contact is mounted to a switch arm through the cap structure and is movable in response to force applied to the switch arm. The open end of the cap structure is closed by a series of elements including a first washer. A soft compressible or pliable washer is positioned inboard of the first washer. A third metallic washer is positioned inboard of the pliable washer.

Abstract: A Belleville spring type of overspeed trip mechanism is made to rotate at the same speed as the shaft by preventing slippage between the spring and the other members of the trip mechanism. Slippage is prevented by forming grooves in the periphery of the interior portion of the spring and using pins which coact with the grooves to prevent rotation of the spring relative to the other members.

Abstract: A shaft mountable, portable, low frequency FM transmission device for comicating rotating shaft mounted sensor information to a stationary platform. It includes a generally cylindrical, dynamically balanced sending unit attached to and encircling the shaft and a remote stationary receiver having a preamplifier and pickup loop encircling but not touching the sending unit. Information from shaft mounted transducers is transmitted from the shaft to the receiver using low frequency FM techniques. Low frequency FM operates at low power which permits use of small batteries containable in a reduced volume, requires minimal receiver electronics, allows undistorted signal transmission at high RPM's and is relatively insensitive to axial and radial shaft movement.

Abstract: A switch actuating device designed to control the speed of rotation of shafts, particularly electric motor shafts. A plastic hub section is designed to be positioned about the shaft, and a plurality of relatively independent, flexing leg, weight members, radially disposed from the hub and integrally connected to the hub by a thin web section, create the actuating members for acting on a switch which directly controls the rotation of the shaft. The web section is dome-like in configuration so that the top regions of the legs are at an axial plane below the uppermost region of the hub and is so designed to permit the legs to force the web upwardly snappingly into contact with the independent switch member.

Abstract: A centrifugal actuator for activating a stationary switch in a single phase induction motor which has a hub with a central opening inside a central body portion for assembly and securement on the shaft of a motor for rotation thereby. The hub has a flat outer member for contacting the switch to actuate starting windings of the motor when the motor is in a rest condition and is removed from the switch under centrifugal action by weights located inside the actuator to cut out the starting windings when the motor is in a run condition.

Abstract: The device is intended to cut-off the supply of electric power to a motor (4) automatically when this latter is locked rotationally under the action of a mechanical resistance.This device comprises balls (5) coupled for rotation with the motor (4) and displaceable under the action of the centrifugal force generated at the time of rotation of this motor, these balls (5) being in cooperating relation with an electric contact (9) in order to put the electric power supply of the motor (4) in circuit when this centrifugal force attains a certain threshold value and in order to put this supply out of circuit when this centrifugal force drops under the action of the mechanical resistance set up in opposition to the torque exerted by the motor.Utilization in particular in automatic devices for the control of opening and closing of garage doors.

Abstract: Disclosed is an overspeed protective apparatus for an electric motor having pairs of stator windings normally connected in parallel, the apparatus having an actuating mechanism responsive to an overspeed condition of the motor and an electrical switching assembly normally connecting the stator windings in parallel but adapted upon actuation by the actuating mechanism to interrupt the parallel connection and connect pairs of windings in series.

Abstract: A weighted trigger device in which the centrifugal force of weights revolving in conjunction with an input shaft is used to displace a movable element axially and in opposition to the force of a spring in order to trigger a control system. The resistance of the weight system is positive and greater at all points to the resistance of the spring.