Abstract: A controllable rotary brake includes two non-magnetically permeable isolating rings, a shaft, an even number of magnetic field generating portions, at least one resistance disc, and at least one magneto-rheological fluid layer. The non-magnetically permeable isolating rings are spaced apart from each other in an axial direction, and each has a bottom wall. An even number of penetrating holes are formed on the bottom wall. The shaft is rotatably inserted in and adapted to pivot relative to the non-magnetically permeable isolating rings. Two ends of each magnetic field generating portion are tightly fitted to the corresponding penetrating holes. The resistance disc is sleeved on the shaft and is spaced apart from one of the non-magnetically permeable isolating rings. The magneto-rheological fluid layer fills between the resistance disc and one of the non-magnetically permeable isolating rings and contacts the resistance disc and one end of each magnetic field generating portion.

Abstract: A drum brake assembly includes a brake drum, a brake shoe and lining assembly operably displaceable to contact the brake drum, and an electric actuator assembly. The electric actuator assembly has an electric motor with an output shaft, a gear reduction driven by the output shaft, a linear translation assembly having a gear nut driven by the gear reduction, and a connection portion of the linear translation assembly. The output shaft drives the gear reduction through a suitable gear type that can convert a rotation torque of the output shaft to the gear reduction at a right angle. The linear translation assembly linearly translates when the gear nut is driven. As a result of the linear translation, the connection portion actuates the brake shoe and lining assembly to contact the brake drum.

Abstract: An electromagnet assembly has an outer shield coil assembly having a first end and a second end, and further has a housing having a first end wall and a second end wall spaced apart from one another by a side wall. The outer shield coil assembly and housing are centered on a common assembly axis. A first support pin extends between and couples the first end wall of the housing and the first end of the outer shield coil assembly. A second support pin extends between and couples the second end wall of the housing and the second end of the outer shield coil assembly. Hence the outer shield coil assembly is carried by the housing by the pins. The coupling of the end walls of the housing and ends of the outer shield coil assembly is configured to prevent relative radial and rotational movement between the outer shield coil assembly and the housing.

Abstract: A device for a friction force provider for an emergency safety actuator for an elevator is disclosed. The friction force provider may include a housing having a first end and an opposing second end, where the first end may define an opening. The friction force provider may further include a primary magnet positioned within the housing and configured to move between an armed position and a working position. The primary magnet may be configured to create a force on a rail of an elevator system in the working position and be held within the housing in the armed position.

Abstract: The invention relates to an elevator comprising an elevator control having a motor drive of an elevator motor driving an elevator car on an movement path, which motor drive comprising a frequency converter with a rectifier bridge designed to be connected to mains, a converter bridge for feeding the elevator motor and an intermediate DC circuit located in-between, the elevator further comprising a brake drive for supplying energy to at least two motor brakes with the brake drive being connected to the intermediate DC circuit as well as an emergency power supply battery designed to allow safe release of passengers in case of a power outage. According to the invention the battery is connected to the intermediate DC circuit, and the elevator control has a measuring circuit connected to the intermediate DC circuit and the elevator control has a battery testing module which is configured to apply a defined load to the battery and to measure the voltage of the DC circuit for a defined time period.

Abstract: At the connection region (connection mechanism of a parking lever and an electric actuator, a first connection pin is fitted in the end of a shaft member, is orthogonal to the shaft member, and is disposed parallel to the support shaft of the parking lever. A second connection pin is fitted in the swinging end of the parking lever and is parallel to the first connection pin. A connection member is rotatable with respect to the end of the shaft member in the circumferential direction of the first connection pin at a first hole where the connection member is fitted on the first connection pin, is rotatable with respect to the parking lever in the circumferential direction of the second connection pin at a second hole where the connection member is fitted on the second connection pin, and connects the two pins.

Abstract: Disclosed is an electric disc brake capable of reducing noise and vibration while expanding the life span of the product. The electric disc brake includes a caliper housing to press friction pads provided at both sides of a disc against the disc, a cylinder installed in the caliper housing, a piston moving back and forth in the cylinder to press the friction pads, a driving device generating driving force with respect to the piston, and a volume compensation part communicated with the cylinder to compensate for an increment of a volume of the cylinder according to movement of the piston.

Abstract: A method for controlling an electrically actuated brake including determining an actuator clamping force actual value (Fist), using a force sensor and determining an actuator position actual value (?ist) or an actuator speed actual value (nist) using a position sensor for activating the actuator by a controller. The controller includes a selection and evaluation device. The selection and evaluation device supplies to the controller input reference value (?in-soll) and a controller input actual value (?in-ist). The controller input variables (?in-soll, ?in-ist) are made available by the selection and evaluation device such that the controller can be operated in at least two control modes. The control modes include a force control (M1) for adjusting an actuator clamping force reference value (Fsoll), or position control (M3, M4) for adjusting an actuator position reference value (?soll, ??soll), or speed control (M2) for adjusting an actuator speed reference value (nsoll).

Abstract: A drive system is provided for a utility vehicle and includes an alternating-current (AC) motor for providing a drive torque. An AC motor controller receives a battery voltage signal, throttle pedal position signal, brake pedal position signal, key switch signal, forward/neutral/reverse (FNR) signal, and run/tow signal indicative of the utility vehicle being configured to be driven and being configured to be towed. The AC motor controller generates an AC drive signal for the AC motor, wherein the AC drive signal is based on the battery voltage signal, throttle pedal position signal, brake pedal position signal, key switch signal, FNR signal, and run/tow signal.

Abstract: A method and system for automatic braking is described. A service brake which can be operated electrically with a compressed air pressure and a parking brake which can be operated electrically are provided. When the vehicle stops due to the service brake being applied, the service brake is released and the parking brake is applied as a function of a release criterion. The release criterion includes the parking brake not being applicable manually because of a defect, and the operation of a control element for application of the parking brake.

Abstract: A method and system for automatic braking is described. A service brake which can be operated electrically with a compressed air pressure and a parking brake which can be operated electrically are provided. When the vehicle stops due to the service brake being applied, the service brake is released and the parking brake is applied as a function of a release criterion. The release criterion includes the parking brake not being applicable manually because of a defect, and the operation of a control element for application of the parking brake.

Abstract: Latching mono-stable brakes which are held disengaged from braking surfaces by the energization of electromagnets, and are engaged with the braking surfaces by deenergization of the electromagnets and the magnetic forces of permanent magnets. The brakes are particularly applicable to linear braking in such vehicles as elevators, trains, trams, cable cars and the like. They may also be applicable to vehicle brakes which act on rotating braking surfaces. They may be actuated in response to excessive speed, particularly when installed in vehicles such as elevators. They may be unlatched as needed by reenergization of the electromagnets.

Abstract: A mono-stable brake system having a mono-stable magnetic array composed of one or more permanent magnets and one or more electromagnets, the stable brake system condition being the brake applied mode in which the magnetic array is magnetically latched by permanent magnet power, without any electromagnet power, to a rotatable member being braked. To release the brake, the permanent magnet field strength is neutralized or at least decreased by appropriate energization of the one or more electromagnets until the magnetic array is moved by magnetic force away from the rotatable member being braked. The brake is preferably in a vehicle braking system, and particularly a trailer braking system, in which the electromagnets are kept energized at all times when the brake is released for trailer movements. The amount of brake application in the service braking mode is controlled by decreasing the magnetic field strength of the one or more electromagnets in accordance with the braking action demand placed on the system.

Abstract: A magnetic latching mechanism and method having permanent magnets and electromagnets arranged to alternately magnetically latch one member to either of two other members using the magnetic flux of the permanent magnets. The magnetic flux of the electromagnets is used to modify the permanent magnetic flux to cancel its magnetic latching to one of the other members and attract the one member to the other of the other members so that the one member is moved to disengage from the one member and engage that other member. The electromagnets are then deenergized and only the permanent magnets' magnetic flux magnetically latches the one member to that other member. The process is reversed to move the one member back into latching engagement with the member with which it in disengaged, magnetically released, relation. The mechanism is disclosed as being used to actuate and release parking brakes by acting on a parking brake actuating arm to move, latch and release that arm.

Abstract: A disk brake has an electromagnetic friction clutch that is brought into controllable frictional engagement with a brake disk. The friction clutch is in form-fitting rotational engagement with a piston of a clamping device for the friction linings associated with the brake disk, the piston is axially displaceable by a key driver that is independent of the direction of rotation. To press the friction linings against the brake disk, energy is provided by the rotating vehicle wheel by the friction clutch and metered to the clamping device. The friction brake can be used in passenger cars, for example.

Abstract: An electromagnetic friction brake in which a friction pad on an electromagnet frictionally engages a rotating armature disc when the electromagnet is excited. The electromagnet is attached to a fixed mounting member by a pair of pins which project into holes in the electromagnet. The pins and holes are arranged such that one pin sustains all of the angular thrust which is imposed on the electromagnet by the armature while the other pin sustains no angular thrust and serves to retain the electromagnet radially of the armature. Such an arrangement of the pins serves to reduce accelerated wear which otherwise occurs at the leading edge portion of the friction pad.

Abstract: An improved electromagnet assembly is disclosed for use in electrically actuated drum brakes. The electromagnet assembly has a cup shaped stamped metal housing. A center pole is mounted in a central opening in the housing which has stepped edges so as to alternately engage the center pole and form arcuate gaps about the center pole. A flux washer is positioned on the center pole to bridge the gaps for increasing the efficiency of the electromagnet. A solenoid winding is positioned within the opening defined by the housing, the flux washer and the center pole and the opening is closed with a friction material.

Abstract: The friction face of an electromagnet is formed by a relatively thin sheet of friction material and by magnetic inserts which are secured to the friction material and which define the pole faces of the magnet. The friction face is adapted to be easily removed from the magnet and replaced with a new friction face when the friction face becomes worn.

Abstract: An electromagnet for brakes and clutches having outer and inner poles and an electrical coil for creating a magnetic field between these poles is provided having a circumferential gap in the forward portion of the outer pole. The gap reduces the flux density over the forward portion of the magnet face while increasing the flux density over the rearward portion. The variable flux density over the magnet face thus establishes an unbalance of forces attracting the magnet toward the armature plate causing the magnet to engage the armature plate heel first thereby eliminating "squeal" caused by magnet gouging and two plane wear of the magnet's friction face.

Abstract: An electromagnet in which an oblong block of friction material captivates a coil on an oblong plate which is stamped from sheet metal. One pole of the magnet is formed by a stud which is secured to the plate while the other pole or poles either are formed by flanges bent from the plate or by an additional stud or studs secured to the plate.

Abstract: A brake control system comprising an electric brake or the like having first and second electrically-operated brake actuators adapted for separate actuation, an operator-responsive controller for applying a first braking signal to the first actuator, and a control circuit responsive to the first braking signal for applying a second braking signal to the second actuator in substantially linear proportion to the first braking signal when the first braking signal exceeds a preselected threshold.

Abstract: An electromagnetically actuated drum type brake embodying an improved support for the actuating magnet. The magnet is supported by a lever and when energized effects pivotal movement of the lever to actuate the brake. The support between the lever and magnet permits some floating movement of the magnet so as to accommodate for surface irregularities and relative movement between the magnet and the lever as is necessary to effect brake actuation. The support, however, restricts the degree of relative movement between the magnet and lever to acceptable values while transmitting the actuating force from the magnet to the lever. The support comprises an integral tab formed at the outer end of the lever which extends into an aperture in the magnet with sufficient clearance to permit limited movement in several directions. Rotary movement is, however, not restricted by this connection.

Abstract: A remote control circuit for regulating current to electric trailer brakes as a function of the brake fluid pressure within the tractor brake system or in response to activation of a control arm by the tractor operator. A hydraulic transducer is connected directly to the tractor brake system to produce an electrical signal at the control circuit which varies as a function of the hydraulic fluid pressure. An electromagnetic, pressure-responsive circuit is also disclosed which is operatively connected to the trailer brakes and which retards movement of the operator control arm at the control circuit in proportion to the brake torque applied at the trailer.

Abstract: The device comprises a magnetic inertia block connected to return means fixedly mounted onto either a pulled vehicle or a pulling vehicle, magnetic transducer positioned adjacent the magnetic inertia block and connected to a current source, treating means connected to said magnetic transducer, output of said treating means being connected to the brakes of the vehicle.

Abstract: The electromagnet of an electrically controlled brake is prevented from rotating on its mounting pin by a bracket which also captivates the magnet against axial removal from the pin while leaving the magnet free to pivot and float axially on the pin. The bracket is made of a strip of resiliently yieldable material and includes a leg paralleling the pin and secured at one end of the magnet. The other end portion of the leg extends through a hole in the brake operating arm and is integral with a tang which engages the arm to captivate the magnet against axial removal from the pin.

Abstract: An electrically controlled brake assembly for a vehicle wheel of the type in which an operating arm is mounted between its ends to turn about a pivot on a backing plate and carries at least one electromagnet on one of its ends. Two downwardly projecting tongues are formed on the lower end of the pivoted operating arm of the brake assembly and ride in a channel defined by a guide which is attached to the backing plate of the assembly, the tongues and the guide coacting to prevent the operating arm from cocking on its pivot during braking.

Abstract: An electromagnet for use in electric brakes and similar type clutches which will apply balanced friction face pressure against a rotating armature face despite the additional, externally imposed, pressures which are directed to its leading edge by tipping moments existing at its point of restraint. The electromagnet departs from conventional design in that a non-magnetic wear or friction face replaces a sufficient area of the outer magnetic pole face on the leading edge of the electromagnet to insure that the externally imposed forces on the leading edge of the electromagnet are balanced by the magnetic linkage forces existing in the rest of the electromagnet faces. Balanced friction face pressure greatly increases the performance and useful life of an electromagnet and the electric brake or clutch system which it actuates.

Abstract: Two embodiments of electrically operated disk type brakes. In each embodiment the electric operator includes an electromagnet that is supported contiguous to the rotor and which, when actuated, moves axially into engagement with the rotor and rotates slightly with it. Means including tilting pin operators interconnect the electromagnet with the brake pads for actuating the brake pads in response to rotation of the electromagnet with the rotor. In one embodiment an improved connection is provided between the electromagnet and one brake pad that accommodates for changes in the degree of lining wear of the brake pads. In the other embodiment an arrangement is provided to balance the forces on the electromagnet and eliminate uneven wear.