Chr. Mayr Gmbh+co. Kg

Karl Schilling

Christoph Dropmann

Harald Weiss

Winfried Hofler

Gunter Klinger

A friction safety brake which is released by virtue of an electromagnet is disclosed. Extending from a machine wall is a shaft that is rotatable relative to the machine wall. The shaft is to be braked by the friction safety brake. The brake includes: a first assembly comprising a coil carrier, a coupling element, a flange plate, at least one first brake disk and an intermediate disk; and a second assembly comprising an armature disk, at least a second brake disk and the intermediate disk. The flange plate is coupled in an axial direction with the coil carrier by virtue of coupling elements and is independently movable relative to the armature disk in the axial direction such that two braking circuits are available. The first braking circuit includes the armature disk, the coil carrier and the flange plate (,) coupled to each other in the direction of rotation. And, the second braking circuit includes the intermediate disk being relatively axially displaceable with respect to the coil carrier and the machine wall.

Friction safety brake having two independent braking circuits

The invention relates to an electromagnetically releasable friction safety brake with two brake discs (,) which are arranged on a common central drive shaft to be axially displaceable but non-rotatable with respect to the shaft. Axially disposed between the two brake discs (,) in a spool carrier (,) is a magnetic coil (,) and springs (,) that urge the brake discs (,) into the braking position. To solve the problem of simplifying such a brake further saving cost and space without detracting from the functional safety of the brake, it is envisaged that the electromagnet consisting of the magnetic coil (,) and the spool carrier (,) that surround the central shaft or hub are axially displaceable but non-rotatable in the brake, that a single armature disc (,) which is also axially displaceable but non-rotatable in the brake is arranged between the two brake discs (,) and the magnetic coil/spool carrier, and that the springs (,) are tensioned axially between the magnetic coil/spool carrier, and the single armature disc (,). In an alternative arrangement, the drive shaft takes the form of a boss surrounding the brake assembly. Brake discs have radially outwardly facing splines that engage radially inwardly facing splines within the boss. In a linear version of the brake, the brake discs are replaced by the cables or webs of external equipment.

Electromagnetically releasable friction safety brake

An automatic air gap readjusting assembly in a clutch or brake unit is operated by electromagnetic and spring forces. A drive shaft 3 frictionally mounts, by a plurality of O-rings, an adjustment member. The adjustment member is readjusted by a contact or armature plate such that the air gap between the armature plate and the electromagnetic mechanism attracting the armature plate will remain constant, i.e. the stroke of the armature plate will remain constant. Torque is transmitted from the drive shaft to the armature plate via a radial flange having a plurality of axially movable torque transmitting bolt assemblies, which are clamped to an annular spring member secured to the armature plate. This arrangement allows for continuous readjustment for wear of the air gap between the armature plate and the electromagnetic mechanism; furthermore, the readjustment always takes place under uniform force conditions despite increasing wear.

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Marktoberdorf, Germany

Karl Schilling