Abb Schweiz Ag

Matti Knuuttila

Juha Soldan

Mikko Välivainio

The construction comprises a rotary handle with a first pivot axis, a locking latch with a second pivot axis, a fixed bottom ring, a locking pin movable with the locking latch between a first position in which the rotary handle can be turned in relation to the bottom ring and a second position in which the locking pin prevents turning of the rotary handle in relation to the bottom ring, a shaft adapter rotationally movable against a spring force in relation to the rotary handle. The shaft adapter comprises a protrusion having a locking member which locks the locking pin into the first position when the torsional moment acting on the rotary handle exceeds the spring force acting on the shaft adapter causing a limited rotational movement of the shaft adapter in relation to the rotary handle.

Rotary handle construction of an electrical switch

The construction includes a rotary handle turnable around a first pivot axis between an open- and a closed-position, a locking latch turnable around a second pivot axis between a locked position and a released position, a fixed bottom ring, a first locking pin movable in the longitudinal direction with the locking latch between a first position in which turning of the rotary handle is allowed and a second position in which turning of the rotary handle is allowed and a second position in which turning of the rotary handle is prevented. A second locking pin is movable between a first position in which turning of the locking latch between a locked-position and a released-position is allowed and a second position in which turning of the locking latch into the locked-position is prevented.

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Vaasa, Finland

Matti Knuuttila