Abstract: Selected designs for reciprocating pumps and down-hole well-stimulation equipment reflect disparate applications of identical technical principles (relating to, e.g., the vibration spectrum of an impulse). In certain of these designs, the vibration spectrum is controlled, suppressed and/or damped using tunable components to limit destructive excitation of resonances; in others the vibration spectrum is tuned at its source for maximum resonance excitation. For example, tunable fluid ends control valve-generated vibration to increase fluid-end reliability. By down-shifting the frequency domain of each valve-closing impulse shock, initial excitation of fluid end resonances is minimized. Subsequent damping and/or selective attenuation of vibration likely to excite one or more predetermined (and frequently localized) fluid end resonances represents further optimal use of fluid end vibration-control resources.

Abstract: A vibration isolator includes a housing having an upper fluid chamber, a lower fluid chamber, a piston, a tuning passage, and a linear inductance motor assembly for changing the isolation frequency of the vibration isolator. The piston is resiliently disposed within the housing. A vibration tuning fluid is located in the upper fluid chamber, the lower fluid chamber, and the tuning passage. The linear inductance motor assembly includes a magnet member and an inductance coil at least partially surrounding the magnet member. A control system is configured to selectively actuate the magnet member; wherein selective actuation of the magnet member selectively imparts a pumping force on the tuning fluid, thereby changing the isolation frequency.

Abstract: A yoke core of an electromagnetic brake system includes a rotation shaft hole portion through which a rotation shaft is penetrated, and additionally includes an inner yoke portion and an outer yoke portion which are arranged on both inner and outer sides, by pinching a concave groove. A coil is accommodated in the concave groove and a magnetic flux is generated by applying electricity to attract an armature. The armature has a penetrating hole portion in the center, and a protruded shaft portion formed on the inner yoke portion is inserted to the penetrating hole portion. The rotation shaft has one side thereof rotatably supported by a support portion of a housing, and the other side thereof rotatably supported by the protruded shaft portion via the armature and a planetary gear mechanism. Accordingly, it is not necessary to provide bearings or the like.

Abstract: A magnetic brake unit includes an operation unit, a rotating plate placed below the operation unit and coaxially rotating with the operation unit in conjunction with an operation of the operation unit, and an electromagnetic brake that is placed to be in contact with the rotating plate and can magnetically adsorb the rotating plate, in which the rotating plate includes an adsorbed surface in contact with the electromagnetic brake, the electromagnetic brake includes an adsorbing surface in contact with the rotating plate, the electromagnetic brake applies a braking force against a pivoting to the rotating plate when the electromagnetic brake magnetically adsorbs the rotating plate, the rotating plate is pivotable in a state of being in contact with the electromagnetic brake when the electromagnetic brake does not magnetically adsorb the rotating plate, and a polymer material section is formed at least one of the adsorbed surface and the adsorbing surface.

Abstract: An electric motor for driving a vehicle wheel includes a parking brake that is selectively applied to provide a park brake condition. The parking brake is a clutch style brake and includes a sliding brake disk that is mounted for rotation with a motor shaft. A brake piston is used to move the sliding brake disk into engagement with a motor housing to achieve a park applied position. The parking brake is held in a release position by a hydraulic system that exerts a fluid pressure force against the brake piston. A resilient mechanism cooperates with the brake piston to apply the parking brake once the fluid pressure force is diminished.

Abstract: A brake release device attached to a door machine comprises a ring plate provided with a plurality of openings and fixed on a pull chain disc, a base plate located at the outside of the door machine, a passive plate provided with a plurality of plug pins that correspond to the openings of the ring plate and slides together with the sliding pin, a guiding member fixed together with the base plate, a sliding pin corresponding to a brake release bar for releasing brake of the door machine and slidably guided by the guiding member, a spring element and a fusible link device that curbs the sliding pin from leaving the brake release bar. By the spring element, the guiding member stores potential energy for sliding.

Abstract: A machine tool brake device of a portable machine tool includes at least one magnetic-field-type brake unit that is configured to brake a spindle and/or a machining tool when the magnetic-field-type brake unit is in at least one braking position. The machine tool brake device further includes at least one spindle immobilization unit that is configured to immobilize the spindle when the spindle immobilization unit is in at least one immobilization position. The machine tool brake device also includes at least one activation unit that is configured to transfer the magnetic-field-type brake unit into the braking position and to enable an automatic transfer of the spindle immobilization unit into the immobilization position.

Abstract: The invention relates to an actuator system, in particular an electromechanical parking brake system, comprising an actuator, wherein the actuator is driven by a direct current motor that can be driven in both directions of rotation, wherein a control unit for controlling the movement of the direct current motor in an open-loop or closed-loop manner is provided. The core of the invention is that one or more pieces of information are supplied to a control unit, said information allowing the application force exerted by the electromotive actuator to be determined and compared to a predetermined minimum application force, and wherein the control unit emits at least one piece of information, signal or the like for requesting an auxiliary actuation to peripheral systems, components and/or electronic control units after the target to actual value comparison has shown that the determined, set application force is smaller than the predetermined minimum application force.

Abstract: A blocking device, and a gear-drive unit containing such a blocking device, and a method for producing such a gear-drive unit for blocking a rotary motion of a shaft relative to a housing of the gear-drive unit, having a first, rotatable blocking element and a second blocking element which is displaceable relative to the first blocking element by means of at least one electromagnet and at least one restoring element, in which the blocking elements in the blocked state mesh in the axial direction with one another by form-locking, and the blocking device is embodied as a separate, independent structural unit, which can be mounted as a unit on the one hand onto the housing and on the other onto the shaft.

Abstract: A blocking device, and a gear-drive unit containing such a blocking device, and a method for producing such a gear-drive unit for blocking a rotary motion of a shaft (14) relative to a housing (16) of the gear-drive unit (10), having a first, rotatable blocking element (32) and a second blocking element (34) which is displaceable relative to the first blocking element (32) by means of at least one electromagnet (44) and at least one restoring element (42), in which the blocking elements (32, 34) in the blocked state mesh in the axial direction with one another by form-locking, and the blocking device (30) is embodied as a separate, independent structural unit (31), which can be mounted as a unit (31) on the one hand onto the housing (16) and on the other onto the shaft (14).

Abstract: An electromagnetic clutch includes a rotating member; an electromagnetic coil that is arranged on a rotational axis of the rotating member and generates electro-magnetic force; an output mechanism that has an armature to which return force in a direction away from the electromagnetic coil is applied by a return spring; a cam mechanism that is juxtaposed along the rotational axis to the output mechanism, and has a control cam that is unable to rotate relative to the rotating member, and a cam follower that is able to roll between the control cam and the armature; and a relative rotation restricting device that is arranged on an axis of the cam mechanism, and that is configured to restrict relative rotation between the armature and the control cam when the electromagnetic coil is in a de-energized state.

Abstract: A flywheel assembly for exercise devices includes a flywheel. A first disc and a second disc sequentially received in the flywheel and securely attached to each other. A control plate is rotatably sandwiched between the first disc and the second disc. Multiple magnetic devices are respectively and radially connected to the control plate. A shaft centrally extends through the first disc, the second disc and the flywheel, and laterally mounted onto the second disc, wherein the flywheel is rotatable relative to the first disc, the control plate with the magnetic devices and the second disc. A drive device is laterally mounted onto the second disc for driving the control plate and adjusting the damping to the flywheel when the control plate is rotated relative to the first disc and the second disc due to the operation from the drive device.

Abstract: A multi-joint fixture including a proximal base unit, one or more arms serially connected by electromagnetically lockable ball joints, and a distal hub. The ball joints unlock when not powered. A centering mechanism biases the ball joints toward a neutral position. A control system activates the electromagnetic brake with a high-then-low voltage profile. A headpiece attaches to the hub and holds a drape that covers the fixture. A connector connects a surgical device to the headpiece. A switch on the hub can be actuated via actuators on the headpiece or connector.

Abstract: An electromagnetic brake contains a coil seat including plural receiving holes disposed on a front end thereof to receive plural compression springs respectively and an electromagnetic coil mounted on the front end thereof; a movable friction piece fitted on the front end thereof; a brake member fixed in a front end of the friction piece and including a transmitting shaft fitted thereon; a fixed member secured on a front end of the brake member, wherein the electromagnetic coil includes a first silicon steel ring, a plurality of slots and a number of elongate grooves, and each slot includes an isolation holder fitted therein, and the isolation holder includes a recess formed on one side thereof to correspond to the groove of the first silicon steel ring, and between two abutting isolation holders is provided with a coil set formed by an enameled copper wire.

Abstract: Vehicle wheels may be equipped with a stator and rotor to induce current to generate electricity as the vehicle wheels rotate or to slow down the vehicle wheels in response to the application of a brake of the vehicle. Air may be sucked through the vehicle wheels through mesh screens to create air flow that passes through ductwork to reach a turbine generator, which generates electricity in response to blade rotation from air flow. A roof mounted solar energy conversion system may generate electricity. A vehicle power supply boosts its energy from all the electricity generated.

Abstract: An elevator brake assembly includes a braking fluid for providing a braking force. A first magnet provides a first magnetic field that influences the braking fluid to provide the braking force. The second magnet selectively provides a second magnetic field that controls how the first magnetic field influences the braking fluid to control the braking force.

Abstract: An electromagnetic brake and a method for manufacturing an electromagnetic brake are disclosed. The electromagnetic brake includes a coil former, a coil, which is fitted on the coil former, and also an electrically connecting part, which is equipped to make an electrically conductive contact between the coil and the power supply cable supplying current to the electromagnetic brake.

Abstract: An elevator system including a braking system, and a method of retrofitting an elevator for such braking system is disclosed. The braking system may comprise a first brake having a first magnetic brake coil, the first brake movable between a disengaged and an engaged position, a second brake having a second magnetic brake coil, the second brake movable between a disengaged and an engaged position, and a brake control device having a brake power source. The brake control device may be electrically connected to the first and second brakes and may be configured to selectively delay or sequence the movement of the first brake and the second brake to the engaged position with residual current from the brake coils.

Abstract: Disclosed is an electromagnetically released spring pressure brake that is to be mounted on a machine wall or similar. Said brake comprises a uniform rectangular coil support (1) with two preferably oval, adjacent coils (7, 7.1), to which two separately movable rectangular armature disks are assigned. Said armature disks apply pressure to a joint rotor encompassing two friction linings that are mounted on each side when the coils (7, 7.1) are de-energized. The rotor is axially movable on an axially toothed hub. Two respective fastening screws (9) are used for guiding each of the armature disks parallel along the central longitudinal axis (13, 13.1) thereof, on the radially largest possible diameter of the rotor. A manual lever (10) featuring manual releasing bolts is provided for each armature disk.

Abstract: An elevator car braking apparatus includes a gear drive assembly for compressing one or more springs which are coupled by a cam follower to one or a pair of brake shoes. When the springs are released from a compressed state, the brake shoes engage and grip hoisting ropes, part of the hoisting apparatus or the car guide rails, within a predetermined time from the start of a brake application cycle. During a brake application cycle, the springs move the cam follower along cam surfaces shaped and disposed to cause the cam follower to move at least one of the brake shoes toward the other brake shoe. The gear assembly includes clutch means for disengaging from and engaging with a gear or axle of the gear assembly during decompression and compression of the springs, respectively. A resilient material in the braking apparatus initially accelerates movement of the cam follower when the springs begin to decompress, and may protect gears of the gear assembly from damage at the end of a brake release cycle.

Abstract: Disclosed is a supplementary braking thrust apparatus for a brake, comprising a thruster. A push lever of the thruster acts on a brake unit. The supplementary braking thrust apparatus of the brake further comprises a supplementary braking mechanism, and the supplementary braking mechanism acts on a brake arm to realize supplementary braking. Also, disclosed is a supplementary braking method of a brake, comprising the following steps: applying a braking action to the brake arm using the thruster; and applying a further braking action to the brake arm using the supplementary braking mechanism to obtain supplementary braking of the brake.

Abstract: A controllable brake includes a housing and a rotor supported on a shaft. The rotor is housed within a chamber containing a field controllable material which is acted upon by a magnetic field generator to impede movement of the rotor. The shaft is supported by bearings. The controllable brake housing defines a second housing chamber adapted to enclose means for monitoring and/or controlling the brake and in this way, an integrated, compact controllable brake is provided.

Abstract: A roller bearing, which has a brake device made of outer and inner bearing rings, between which rollers roll on corresponding rings, a displaceable braking element connected to one of the bearing rings pressed against an associated opposite surface connected to the other bearing ring to generate a braking effect due to a frictional fit, which can be neutralized by an electromagnet. The electromagnet is made of one of the hearing rings as a soft iron core, and a coil encompassing the ring. A ferromagnetic armature plate is connected to one of the bearing rings and is pressed towards a pressure plate, which is connected to the other bearing ring. At least one disc is disposed between the armature plate and pressure plate. The disc is operationally connected to brake linings on both sides, and each have a form-fit connection to one of the bearing rings by guide pins.

Abstract: A vehicle operator input device for controlling the vehicle with the operator input device including an operator interface lever moveable by a vehicle operator in first and second directions about an axis. The operator input device includes a sensor system with a sensor target. The sensor system senses the moveable operator interface lever and provides an operator interface lever position signal as a function of a position of the operator interface lever.

Abstract: A damping apparatus is provided having a payload member, an extension member, and a damping member. The extension member is coupled to the payload member such that when the payload member moves a first distance, the extension member moves a second distance greater than the first distance. The damping member applies a damping force to the extension member when the extension member moves. The application of the damping force to the extension member causes a damping force on the payload member that is greater than the damping force on the extension member. The damping apparatus may utilize permanent magnets and conductive extension members to generate the damping force.

Abstract: An actuator assembly for use with a transmission drive system having a pair of transaxles where each transaxle includes an electric motor and a brake release pin extending from a brake housing, where the release pins are both moveable from a first, engaged position to a second, released position. The actuator assembly includes a support bracket fastened to each transaxle, a sleeve attached to the support bracket and arranged generally parallel to the axes of the first and second release pins, a rod moveably disposed within the sleeve and extending from each end thereof, a pair of levers engaged to the two release pins and to the rod, a fulcrum attached to the support bracket, and an actuator arm engaged to the rod and pivotable about the fulcrum to longitudinally move the rod within the sleeve, wherein the actuator arm is moveable.

Abstract: A vehicle for a rail-borne transportation system includes an eddy current brake that contains a large number of magnetic poles and a mechanism for activating the magnetic poles for braking. The magnetic poles are formed by movably supported permanent magnets, and the activation mechanism switches the permanent magnets from an inactive position into an active position.

Abstract: The present invention provides an electric brake apparatus capable of maintaining predetermined control accuracy despite wear of a brake pad and other changes over time. The electric brake apparatus compares an estimated thrust force corresponding to a predetermined rotational position of an electric motor, which is calculated from an electric current/thrust force conversion function, with a reference thrust force based on a rotational position/thrust force table indicating a relationship between the rotational position of the electric motor and a thrust force of a piston to correct and update the electric current/thrust force conversion function, thereby maintaining predetermined control accuracy despite wear of the brake pad and other changes over time.

Abstract: Brake equipment, for an elevator installation, includes: a static element; a movable element movable relative to the static element in a first degree of freedom, wherein selectably a first frictional contact is produced in a first contact surface between the static element and the movable element by a controllable normal force acting in a second degree of freedom, and a first friction force opposes movement of the movable element relative to the static element; and a relative element, wherein a second frictional contact is produced in a second contact surface between the movable element and the relative element by the normal force, and a second friction force opposes movement of the movable element relative to the relative element. The relative element is movable in the first degree of freedom relative to the static element between a normal position and a braking position and is resiliently biased into the normal position.

Abstract: An electromagnetic brake (20), in particular for an electric drive is provided, having a brake body (3), which is provided with a sleeve-shaped permanent magnet (4), an electromagnet (5) with an exciting coil (6), an external ring in the form of an external pole and an internal ring (8) in the form of an internal pole, wherein an armature disc (12) rotatably connected to a shaft is attractable against the brake body (3) or the external or internal ring surfaces by the permanent magnet (4) force acting against a return spring force. When the exciting coil is powered, the permanent magnet (4) magnetic field is compensated in such a way that the armature disc (12) is lifted up from the brake body (3) by the spring force, thereby allowing the brake to be released.

Abstract: An electromagnetic control for the landing gear of an aircraft includes a hub to be fixed to a frame of an aircraft landing gear. A rotor rotates with a tire on the aircraft landing gear. Permanent magnetic disks are associated with the rotor, and interspersed with disks on the hub. Some of the disks on the hub are electromagnetic disks supplied with electric power, and some of the plurality of disks on the hub are made of high electric conductivity material.

Abstract: A quiescent-current-actuated electromagnetic spring pressure brake including torque transmission sleeves disposed between a machine wall and the brake, and an axially movable armature plate having bores along its periphery to receive the torque transmission sleeves. At least one piston guide ring is provided in the area of torque transmission sleeves on the outer periphery of the latter adjacent an O-ring disposed in a groove, said piston guide ring being placed in the groove of said O-ring or in a separate groove and acting to provide a damping action in the circumferential direction and a sliding displacement of the armature plate in the axial direction.

Abstract: A brake assembly (18) includes a permanent magnet (36) that generates a first magnetic field (52) in a direction that causes application of a clamping force on a brake disk (22). An electromagnet (38) is energized with current of a proper polarity to generate a second magnetic field (54) opposite the first magnetic field (52). The rate and magnitude at which current is applied produces a controlled repulsive force between the two magnetic fields (52, 54) to disengage the brake disk (22). As a distance between the permanent magnet (36) and the electromagnet (38) increases, the difference in field strength decreases until an equilibrium position is obtained. The brake is applied and released in a controlled manner by varying the strength of the second magnetic field (54) relative to the first magnetic field generated by the permanent magnet (36).

Abstract: In a brake- and/or clamping arrangement for a shaft supported in a device housing and comprising a braking disc mounted on the shaft rigidly for rotation therewith and a clamping ring supported in the device housing, the braking disc has a friction area comprising two truncated cone-shaped friction surfaces with at least one brake cone arranged in the device housing and one arranged on an activating member. One brake cone abuts during braking or clamping the brake disc whereas the other brake cone abuts a clamping ring, which is disposed between contact areas of the brake cones, the clamping ring in contact with the brake disc and a brake cone being mounted to the apparatus housing.

Abstract: A brake device arranged between a drive shaft and a driven shaft arranged coaxially with the drive shaft is disclosed. The brake device includes a first rotor, a second rotor, an engagement member, a braking mechanism, and a cam mechanism. The braking mechanism includes a movable friction member rotatable integrally with the second rotor, a fixed friction portion, and an urging member that urges the movable friction member toward the fixed friction portion. When rotational force is provided from the drive shaft to the first rotor, the cam mechanism permits transmission of rotation of the drive shaft to the driven shaft. When the rotational force is provided from the driven shaft to the second rotor, the cam mechanism restricts rotation of the driven shaft. The cam mechanism is provided independently from the engagement member.

Abstract: An apparatus is provided for detecting a malfunction occurring in an electromagnetic brake of a robot. In the apparatus, the main relay and the sub-relay are controlled to open the main contact and the sub-contact when the robot is activated. Detecting is then made whether or not the main contact is malfunctioning, by monitoring an energized state of the main contact. Activation of the robot is stopped when the main contact is malfunctioning and the main relay is controlled to close the main contact for a given period of time when that the main contact is operating normally. Detecting is further made as to whether or not the sub-contact is malfunctioning, by monitoring an energized state of the sub-contact The activation of the robot is stopped when the sub-contact is malfunctioning and the main relay is controlled to close the main contact when the sub-contact is operating normally.

Abstract: A powdered metal electromagnetic is provided that has much less variance between units, increased frictional drag, reduced wear of itself and the brake drum disk during use and an increased resistance to moisture due to the use of a donor material that increases performance and reliability. In addition it can withstand much higher surface speeds while producing higher frictional drag.

Abstract: An electro-hydraulic brake actuator for a vehicle can include an electric motor configured to operate at about 28 Vdc, and to operate at about 2 Amps or less to hold a vehicle brake in a disengaged position. A hydraulic master piston can be operatively coupled to the electric motor, the hydraulic master piston configured to slidingly move within a master cylinder fillable with a hydraulic fluid such that advancement of the master piston within the master cylinder varies the hydraulic pressure supplied to the vehicle brake. The electric motor and hydraulic master cylinder are configured to fit within a wheel hub corresponding to the vehicle brake, the motor configured to operate the hydraulic master piston to vary the hydraulic pressure applied to the brake.

Abstract: A disk brake for a traction machine having a damping height of a damping mechanism that can be adjusted integrally. According to one embodiment, a disk brake includes: a static iron core; a spring and a coil assembly in the static iron core; a dynamic iron core assembly including a dynamic iron core, a dynamic disk, and first and second friction rotors configured to fit with the dynamic iron core and the dynamic disk; a plurality of connecting bolts; a plurality of spacers; a damping mechanism on the dynamic iron core assembly, the damping mechanism including a plurality of damping components on the dynamic iron core; an adjusting toothed belt assembly coupled to the damping components and banded to a circumferential outer surface of the dynamic iron core; and an adjusting bracket on the dynamic iron core and coupled to the adjusting toothed belt assembly.

Abstract: An eddy current magnetic braking system that is based on drag created when a conductor moves through a stationary magnetic field. As the magnetic field increases the drag value also increases. The invention provides a magnetic braking system for use on zip line/cable rides and trolleys. Alternate designs of the present invention include a magnetic braking system having a trolley that moves on a zip line/cable to a brake block which is connected to a pulley cable, as the trolley pushes the brake block, the pulley moves the conductor into a magnetic field creating an eddy current brake that slows the trolley to a stop.

Abstract: In a vehicle parking system, when a selected shift position is changed between Park and a shift position other than Park, if both an electric motor of an electric parking lock mechanism and an electric motor of an electric parking brake mechanism are operated, these electric motors are started in such a manner that the times at which striking currents supplied to these electric motors reach their peaks are staggered.

Abstract: A generator-brake integration type rotating machine comprises an inertia disk coupled to a shaft to rotate; a rotor ring rotating around the shaft inside the inertia disk and having magnets mounted to a circumferential outer surface thereof; and a laminated yoke positioned between the inertia disk and the rotor ring, and having brake coils located at regular angular intervals on a circumferential outer surface thereof and generator coils located at regular angular intervals on a circumferential inner surface thereof. The generator coils are wound on first bobbins which project inward from the circumferential inner surface of the laminated yoke, and the brake coils are wound on second bobbins which project outward from the circumferential outer surface of the laminated yoke. The laminated yoke is fixedly coupled to a stator holder, which in turn is coupled to the shaft by way of a bearing and is fixedly coupled to a housing.

Abstract: A catch device, for example in a safety device of an elevator mechanism, includes at least one first force store element and one second force store element having different force storage rates, and a displacement limit for the first force store element.

Abstract: A fall protection safety device including a braking mechanism comprises a first component, a second component configured and arranged to move relative to the first component, and at least one magnet operatively connected to one of the components and another of the components being at least partially made of a non-ferromagnetic and electrically conductive material. The at least one magnet and the non-ferromagnetic and electrically conductive material creating an electromagnetic field force when the second component moves at a rate greater than a predetermined rate relative to the first component.

Abstract: The power-off electromagnetic brake (2) attracts an armature that is pressed by a spring force to a rotating member by a magnetic attraction force that is generated by energizing an exciting coil, and brake force that is acting on the rotating member is released. A voltage control circuit (12) continuously energizes the exciting coil for a fixed length of time and generates a considerable magnetic attraction force in order to attract the armature to a yoke when a brake power source (14) is switched on during brake release. After the armature has been attracted to the yoke, the voltage control circuit (12) intermittently energizes the exciting coil at a set cycle and a set on/off duty ratio to hold the armature in an attracted state to the yoke, thereby reducing power consumption and heat generation.

Abstract: In a vehicle disk brake, a motor housing houses in a housing recess a case into which an end of an output shaft liquid-tightly protrudes, and is mounted to a caliper body. A reduction mechanism having an output rotating member is sealed in the case while part of the output rotating member fluid-tightly protrudes from the case so as to be coaxially and operatively connected to a rear portion of the screw shaft. Grease is charged into the case. Thus, the case for housing the reduction mechanism is simply configured while preventing leakage of the grease charged into the case, and mounting of the case to the caliper body is facilitated.

Abstract: An electromagnetic brake includes a housing, a pin, brake springs urged against the pin, a handle pivotably secured to the pin, a coil, a moveable armature plate, a moveable friction disc, a trigger switch on the housing and including a projecting contact and a pivotal trigger, steel balls in the half holes of the housing and the handle, and a rod fixedly projecting out of a slot of the handle. In a brake released position, the rod is at one end of the slot with the coil being energized. The handle is adapted to pivot to move the other end of the slot to engage with the rod, the handle contacts and pivots the trigger to enable the trigger switch so as to de-energize the coil, and the springs apply an expansion force to urge against the pin for causing the friction disc to apply brake to a shaft.

Abstract: Blocking apparatus, as well as a gearbox drive unit containing such a blocking apparatus, as well as a method for production of a gearbox drive unit such as this for blocking any rotary movement of a shaft (14) with respect to a housing (16) of a gearbox drive unit (10), having a first blocking element (32) and having a second blocking element (34) which can be moved axially with respect to the first blocking element (32) by means of an electromagnet (44) and at least one return element (42), in order to produce a connection between the first blocking element (32) and the second blocking element (34) such that they cannot rotate with respect to one another, with the electromagnet (44) having an inner pole (47) which is surrounded by an electrical coil (45), and with the inner pole (47) having an axial projection (51) which engages in a corresponding opening (64) in the second blocking element (34), for axial guidance and centering.

Abstract: Method and apparatus for controlling the front and rear wheel braking system of a road-going mass-produced motor car or automobile enables provision of brake-by-wire facilities utilizing an electrically-powered servo motor to generate brake-operating thrust which is applied to the interleaved friction elements and twin discs of a disc brake having axially slideable discs and a fixed caliper and disc and friction element-attitude control structure. The brake is of spot-type disc brake construction and the servo motor applies less brake-actuating thrust than is required for a comparable fixed disc and floating caliper construction.

Abstract: A guide-rail brake (1) of an elevator and a method for controlling the brake are provided. The brake comprises a frame part fixed to the elevator car, a prong part, which contains turning jaws (3,4) that correspond to the guide rail (2) via the braking surfaces when braking, a spring (10) loading the prong part to press the braking surfaces to the guide rail, and a controllable mover, which is an electromagnet (15), which contains two pulling core pieces (17,18). The force effect of the electromagnet (15) on the prong part is opposed to the spring. In the guide-rail brake an air gap (ag) is structurally arranged between the center parts (19,20) of the pulling core pieces (17, 18) of the electromagnet of the guide-rail brake when the brake is fully energized, and a damping circuit is arranged in the coil (16) of the electromagnet (15) of the guide-rail brake to speed up operation of the guide-rail brake.