Preh-werke Gmbh Co. Kg

Preh-werke Gbmh & Co. Kg

Klaus Mueller

Karl-Heinz Bauer

Reinhold Moret

Gerold Eckert

Joachim Storath

A method for manufacturing housing or control-components parts of metal including the steps of: manufacturing a housing or control-component part ( ) as a forged or cast blank ( ), stamping a recess ( ) in the blank for an indicator insert with a stamping die in a stamping device, thereby creating a protrusion ( ) on a back wall surface ( ) of the part in the stamping direction, constricting the recess ( ) with peeled protrusions of the peripheral walls ( ) defining the recess ( ), injecting a transparent plastic ( ) into the recess ( ) and, if applicable, into a mold connected with the recess ( ) for forming a collar ( ) on a front wall surface ( ) in the stamping direction, and ablating the back wall surface ( ) and the protrusion ( ) by a fixed thickness amount ( ), which results in exposure of the recess ( ) and of the transparent plastic ( ).

Method for manufacturing housing or control-component parts of metal

A control knob (,) includes a companion part (,) as a base of the control knob and a control-knob top part (,) having a grip handle (,). The control-knob top part (,) includes a plate (,) having a flexible elastic material coated thereon to form sidewalls (,) of the grip handle (,) which can be flexibly deformed when the grip handle (,) is manipulated. This provides improved manipulation and quiet operation of the control knob (,). Additional push-button and switch functions can be included via a flexible facing wall (,) on the grip handle (,).

Control-knob top part

A control knob (1) includes a companion part (2) as a base of the control knob and a control-knob top part (3) having a grip handle (4). The control-knob top part (3) includes a plate (9) having a flexible elastic material coated thereon to form sidewalls (5.1) of the grip handle (4) which can be flexibly deformed when the grip handle (4) is manipulated. This provides improved manipulation and quiet operation of the control knob (1). Additional push-button and switch functions can be included via a flexible facing wall (5.2) on the grip handle (4).

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Unsleben, Germany

Klaus Mueller