Hoffmann & Co. Elektrokohle Gesellschaft Mbh

Hoffmann & Co. Elektrokohle Aktiengessellschaft

Hoffman & Co. Elektrokohle Gesellschaft M.b.h

Hoffman & Co. Elektrokohle Ges. Mbh

Hoffmann & Co Elektrokohle Ag

Herbert Grabner

Johann Hoell

Klaus Reiser

Peter Hoffmann

Gerhard Limberger

A brush unit for an electric machine has a simple and low-cost but robust design, and can be assembled at low-cost using simple process steps comprises four ring-shaped board elements are stacked on each other, namely two outer circuit boards, each of which is electrically conductively connected to one or more brushes. Two guide boards made of electrically insulative material disposed therebetween, comprise a shape having protrusions and recesses for forming radial guides for the brushes and receptacles for springs acting on the brushes. The springs are spiral springs wound around a mandrel, the flat ends thereof protruding past the springs being rotationally fixedly guided in a guide groove of each receptacle and able to engage behind a stop. In order to assemble the brush unit, the circuit and guide boards are stacked on each other in the axial direction and riveted, then the brushes are inserted in the guides in the radial direction and the springs are placed in the receptacles.

Brush unit for an electric machine, spring and seal arrangement for the same, and method for the production thereof

Process for producing sliding bodies for electric collectors

Carbon brush for collector

A collector shoe for a collector with a carbon brush and a support has, between the carbon brush and supporting element, a galvanically applied metallic layer. The galvanic layer anchors a head portion of a conductor member to the carbon brush. The conductor member has a shaft portion which projects through the support and secures the carbon brush to the support, as well as, establishes an electrical connection to the carbon brush.

Collector shoe for collector and process for producing it

Sliding strip for collector with rupture detection device

Growing community of inventors

Bad Ischl, Austria

Herbert Grabner