Towing winch system 1 for controlling a render and recovery of a towline during a towing operation. The towing winch system has a control unit 6 for controlling a drive 4 and a brake 5 for respectively driving and braking the winding drum. The drive 4 comprises a plurality of brushless alternating current motors 40 which each engages in one stage by a motor gear wheel 71 to a gear wheel 70 mounted to the winding drum 3. The brake 5 comprises a plurality of brake calipers 51 which each are engageable to a brake disc 50 mounted to the winding drum 3. The drivetrain of the plurality of brushless AC motors 40, one stage gear 7 and the plurality of brake calipers 51 form a powerful and robust structure to operate the towing winch system 1 under severe conditions which may occur in a towing operation.

Towing winch system 1 for controlling a render and recovery of a towline during a towing operation. The towing winch system has a control unit 6 for controlling a drive 4 and a brake 5 for respectively driving and braking the winding drum. The drive 4 comprises a plurality of brushless alternating current motors 40 which each engages in one stage by a motor gear wheel 71 to a gear wheel 70 mounted to the winding drum 3. The brake 5 comprises a plurality of brake calipers 51 which each are engageable to a brake disc 50 mounted to the winding drum 3. The drivetrain of the plurality of brushless AC motors 40, one stage gear 7 and the plurality of brake calipers 51 form a powerful and robust structure to operate the towing winch system 1 under severe conditions which may occur in a towing operation.

A lever hoist includes a housing in which a load chain wheel and a driveshaft driving the load chain wheel are mounted, as well as a safety brake. A load chain is movable via the load chain wheel. The safety brake brings about an emergency braking in the event of excessive rotational speed of the driveshaft. The safety brake has a locking disc with teeth and a control disc with control cams. The locking disc and the control disc are rotatable in relation to one another in a limited manner. A catch hook is movable in a swivelling manner and has a latch contour and a sensing contour. The sensing contour rests on the control. In response to exceeding a defined rotational speed, the sensing contour lifts off the control disc. The latch contour rotates towards the locking disc and engages with a locking tooth of the locking disc.

A lever hoist includes a housing in which a load chain wheel and a driveshaft driving the load chain wheel are mounted, as well as a safety brake. A load chain is movable via the load chain wheel. The safety brake brings about an emergency braking in the event of excessive rotational speed of the driveshaft. The safety brake has a locking disc with teeth and a control disc with control cams. The locking disc and the control disc are rotatable in relation to one another in a limited manner. A catch hook is movable in a swivelling manner and has a latch contour and a sensing contour. The sensing contour rests on the control. In response to exceeding a defined rotational speed, the sensing contour lifts off the control disc. The latch contour rotates towards the locking disc and engages with a locking tooth of the locking disc.

An electromagnetic brake with a housing body and a coil unit, wherein the coil unit has a positive connection to the housing body, wherein the coil unit is positively connected to the housing body by means of a snap-fit connection, wherein at least one snap hook of the coil unit is supported on a web of the housing body.

An electromagnetic brake with a housing body and a coil unit, wherein the coil unit has a positive connection to the housing body, wherein the coil unit is positively connected to the housing body by means of a snap-fit connection, wherein at least one snap hook of the coil unit is supported on a web of the housing body.

A method is disclosed of retrofitting an elevator machine with primary and secondary braking, the machine being disposed on a machine support frame in an elevator machine room, and engaging one or more ropes for providing selective movement of an elevator car disposed in an elevator shaft, the machine having a drive sheave including a cylindrical brake drum, and brake components including dual brake arms; the method including: removing the brake components; affixing flanged disc segments about the drum and interlocking the flanged disc segments to form a brake rotor; and mounting respective brake calipers to frame mounts for providing primary and secondary braking to the elevator machine.

A method is disclosed of retrofitting an elevator machine with primary and secondary braking, the machine being disposed on a machine support frame in an elevator machine room, and engaging one or more ropes for providing selective movement of an elevator car disposed in an elevator shaft, the machine having a drive sheave including a cylindrical brake drum, and brake components including dual brake arms; the method including: removing the brake components; affixing flanged disc segments about the drum and interlocking the flanged disc segments to form a brake rotor; and mounting respective brake calipers to frame mounts for providing primary and secondary braking to the elevator machine.

A lever hoist includes a housing in which a load chain wheel and a drive shaft driving the load chain wheel via a transmission are rotatably mounted, as well as a safety brake. A load chain is movable via the load chain wheel. The safety brake implements emergency braking in response to excessive rotational speed of the drive shaft. The safety brake includes a locking disc with teeth and a control disc with control cams. The locking disc and the control disc are rotatable in a limited manner. A catch hook is movable in a swivelling manner and has a latch contour at a front end and a sensing contour at a rear end. The sensing contour rests on the control disc. When a defined rotational speed is exceeded, the sensing contour lifts off the control disc. The latch contour engages with a locking tooth of the locking disc.

An electromagnetic brake with a housing body and an armature disk, wherein the armature disk is guided axially via a groove-lug connection in the housing body, and wherein at least one guide groove and at least one associated guide lug are provided, wherein the respective guide groove is preferably arranged in the housing body.