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| Number | Title | Issue Date |
| 4673073 | Centrifugal spring clutch A normally engaged wrap spring clutch includes a helical spring which normally is wrapped down on the outer surfaces of aligned input and output hubs to couple the latter. One end of the spring is anchored on the input hub and the other end is secured to ... | 06/16/1987 |
| 4626719 | Stepping motor having rotor with axially spaced sections The rotor of a stepping motor includes two axially spaced sections each formed with radially projecting and angularly spaced teeth. The angular width of the teeth of one section is approximately the same as the angular width of the pole pieces of the stat... | 12/02/1986 |
| 4567975 | Apparatus and method for controlling the engagement of a gap-type electromagnetic coupling and for alleviating engagement noise An apparatus and method is provided for energizing a multiple-turn winding of an electromagnetic coupling having an armature and a rotor separated by an air gap; in response to the closure of the air gap, the energization of the winding is reduced so as t... | 02/04/1986 |
| 4515251 | Electromagnetic brake with improved armature mounting A resiliently flexible strip device mounts the armature of an electrically released brake for movement toward and away from the pole faces of the field shell, the armature either moving with pivotal motion or with linear motion. The resiliently flexible s... | 05/07/1985 |
| 4509091 | Methods and apparatus for controlling the engagement of gap-type electromagnetic couplings A control unit and method for operating a gap-type electromagnetic clutch or brake is provided which reduces audible chatter, screeching caused by belt slippage and related wear and tear on the driving and driven components. The operating winding of the c... | 04/02/1985 |
| 4496922 | Electromagnetically released coupling A magnet assembly is made up by a plurality of magnet modules each having a permanent magnet adapted to attract a rotatable armature into engagement with the pole pieces of the module. Each module also includes an electromagnetic coil having an axis dispo... | 01/29/1985 |
| 4493407 | Armature assembly for an electromagnetic clutch An armature of an electromagnetic clutch is connected by a mounting plate to a toothed driven hub of the clutch through the intermediary of an annular elastomeric spider. When the parts are assembled, the spider is precompressed around its entire peripher... | 01/15/1985 |
| 4445606 | Armature assembly for electromagnetic coupling An armature of an electromagnetic clutch is connected to a mounting plate which is coupled to the toothed driven hub of the clutch through the intermediary of an elastomeric spider. If the spider is melted by heat, the mounting plate wedges against the ti... | 05/01/1984 |
| 4418811 | Clutch with fail-safe helical spring A helical spring loosely surrounds the input hub of a clutch and is adapted to be wrapped down on the input hub to couple the input hub to an output hub. Wrap down torque is applied to the spring through the tang thereof by an operating spring which acts ... | 12/06/1983 |
| 4388988 | Anti-kickback clutch-brake unit A helical spring clutch-brake unit in which the spring is prevented from wrapping down and momentarily engaging the clutch if the output member of the clutch is manually turned while the clutch is disengaged.... | 06/21/1983 |
| 4369011 | Preloaded ball screw assembly Ball nuts are preloaded onto a ball screw by rotating the nuts relative to one another to jam adjacent end faces of the nuts together. Thereafter, the nuts are held against relative rotation by tightening a clamping ring secured to one of the nuts and ada... | 01/18/1983 |
| 4344056 | Electromagnet with replaceable friction face 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 rem... | 08/10/1982 |
| 4330054 | Amplifying clutch with radially contractible shoe Pilot torque is transmitted from the input member to the output member of a clutch when a shoe is pressed axially against the input member. When initially turned by the input member, the shoe causes a helical spring to wrap down on angularly spaced shoe s... | 05/18/1982 |
| 4321992 | Wrap spring coupling with improved spring The helical spring of a wrap spring clutch is formed with a radially projecting protrusion which is spaced 180 degrees from one of the end tangs of the spring. The protrusion and the end tang are connected to the control collar of the clutch and cause the... | 03/30/1982 |
| 4286793 | Ice breaking and mud deflecting device for a ball screw and nut assembly A ring is telescoped into the end of a nut of a ball screw and nut assembly and carries a lip which breaks ice away from the screw. The plastic insert of relatively short circumferential length is supported by the ring and is urged into the groove of the ... | 09/01/1981 |
| 4286701 | Amplifying clutch Torque is transmitted from the input member of a clutch to a primary shoe when the primary shoe is pressed into frictional engagement with the input member by compression springs. When initially turned by the input member, the primary shoe moves a series ... | 09/01/1981 |
| 4266437 | Ball screw and nut assembly A ball screw nut assembly of the type in which a nut having an internal helical groove is telescoped over a shaft having an opposing helical groove and an endless train of balls is disposed in the grooves so that the nut travels axially along the shaft as... | 05/12/1981 |
| 4250762 | Actuator having a drive screw and a selectively rotatable nut A linear actuator includes a nut threaded onto a rotatable drive screw and adapted to be coupled to and uncoupled from an axially movable driven member by a selectively engageable and disengageable helical spring clutch and a friction clutch connected in ... | 02/17/1981 |
| 4222614 | Surge control for electrical trailer brakes The electrical brake coils of a trailer are energized when the stoplight switch of the towing vehicle is closed and the trailer surges forwardly with respect to the towing vehicle to cause the wiper of a rheostat to move relatively along the resistor of t... | 09/16/1980 |
| 4213521 | Clutch-brake assembly for rotary implements The blades of a rotary lawn mower are driven by a constantly rotating shaft through a clutch-brake assembly which, when the operator leaves the operating station of the mower such as the mower handles, automatically disengages the blades from the shaft an... | 07/22/1980 |
| 4210890 | Field assembly for an electromagnet The field shell of an electromagnet is formed with angularly spaced flanges which define a magnetic pole and which also serve as a mounting hub for a coil assembly consisting of a bobbin and a multiple turn winding. Resilient fingers on the bobbin snap in... | 07/01/1980 |
| 4209213 | Brush holder and slip ring assembly A brush holder and slip ring assembly in which the housing of the brush holder and the rotor body of the slip ring assembly are both made of plastic. Conductive terminal strips have portions encapsulated by the plastic of the housing of the brush holder a... | 06/24/1980 |
| 4201281 | Electromagnetic clutch having a contractible friction shoe Torque is transmitted between the driving and driven members of the clutch by a helical spring and a friction shoe. When an electromagnet is excited, pilot torque is applied to the spring to cause the spring to clamp downwardly around the shoe and cause t... | 05/06/1980 |
| 4191283 | Helical spring coupling with programmable control collar The control collar of a helical spring clutch is defined in part by a series of rings having radially projecting stop lugs which coact with an interposer. The rings may be adjusted angularly relative to one another to cause the lugs to effect successive d... | 03/04/1980 |
| 4187603 | Method of making an electrically released electromagnetic friction brake An electromagnetic friction brake whose components are held in assembled relationship by pins which are received with a press fit within holes in an electromagnet and an end plate and which are received with a loose fit within holes in an armature. By vir... | 02/12/1980 |
| 4187939 | Armature assembly for electromagnetic coupling The armature of an electromagnetic clutch is connected to an axially fixed elastomeric ring by leaf springs which urge the armature away from the electromagnet. Rivets connect the springs to the armature and are formed with pin-like extensions which are t... | 02/12/1980 |
| 4172242 | Electromagnet for use with a brake or the like 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... | 10/23/1979 |
| 4160498 | Electromagnetic coupling The magnet core of an electromagnetic clutch is substantially J-shaped in radial cross-section and includes an outer pole ring which is spaced radially outwardly from and which only partially surrounds the outer pole ring of the rotor of the clutch. The c... | 07/10/1979 |
| 4156478 | Electrically released electromagnetic friction brake An electromagnetic friction brake whose components are held in assembled relationship by pins which are received with a press fit within holes in an electromagnet and an end plate and which are received with a loose fit within holes in an armature. By vir... | 05/29/1979 |
| 4066996 | Breakaway protection for electrically controlled trailer brakes A control system of the type which provides "breakaway" safety action to energize the electrically actuatable coils of brakes in a trailer pulled by a towing vehicle, the coils being energized under a breakaway condition from an auxiliary battery carried ... | 01/03/1978 |
| 4052695 | Breakaway protection for electrically controlled trailer brakes A control system of the type which provides "breakaway" safety action to energize the electrically actuatable coils of brakes in a trailer pulled by a towing vehicle, the coils being energized under a breakaway condition from an auxiliary battery carried ... | 10/04/1977 |
| 4014412 | Electrically controlled brake with improved anti-rotation bracket for magnet 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 ... | 03/29/1977 |
| 4004663 | Electrically controlled brake assembly with non-cocking operating arm 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 t... | 01/25/1977 |
| 3984711 | Variable reluctance step motor with permanent magnets Permanent magnets are interposed within the circumferential spaces between the circumferentially spaced pole pieces of the stator of a variable reluctance step motor. The magnets are magnetized in a circumferential direction and serve to increase the dyna... | 10/05/1976 |
| 3978947 | Clutch brake unit A clutch-brake assembly includes input and output hubs, respectively, fixed and journaled on a rotatable shaft. A coil spring secured for movement with the output hub normally is wound into driving engagement between the input and the output hubs. A sleev... | 09/07/1976 |
| 3978948 | Neutral-type electromagnetic clutch-brake unit The unit includes an electromagnet which may be energized to effect shifting of an armature from a clutching position in which the armature couples driving and driven elements to a braking position in which the armature engages a braking member to produce... | 09/07/1976 |
| 3966024 | Helical spring clutch A disc brake retards the motion of the normally stationary output member of a helical spring clutch and serves to brake the rotary input member of the clutch to a gradual stop when a coiled helical spring is contracted to couple the output member to the i... | 06/29/1976 |
