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US 2009/0260292 A1Published application
Door Drive Including a Spring Pre-Loading, which is Adjustable During the Movement of the Door
AssigneeDorma GmbH + Co. KG
InventorHolger Hansch
Life of this patent
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Abstract
The invention relates to a door drive with a motor-gear-unit and with a spring (7), which acts as an energy accumulator. With the intention to provide a door drive, in which, through the exchange of a single structural component, two variants for scissor arm assemblies, respectively slide channel arm assemblies are realized, according to the invention, it is provided that the pre-loading of the spring (7) can be actively changed by the motor-gear-unit, whereby the desired closing moment characteristics are generated.
Claims16
A door drive comprising:
- a motor-gear-unit;
- and
- a spring acting as an energy accumulator,
- wherein pre-loading of the spring is actively changeable through activation of the motor-gear-unit.
1 more element
A door drive, comprising:
- a motor gear unit;
- an adjustable abutment;
- a toothed rack;
- an energy accumulator extending in a longitudinal direction and having one end supported on the abutment and another end supported on the toothed rack;
- wherein the motor gear unit is operatively connected to the abutment and the toothed rack such that the motor gear unit is actuatable to move both the abutment and the toothed rack in a direction parallel to the longitudinal direction of the energy accumulator to change the pre-loading of the energy accumulator.
2 more elements
Dependencies are inferred from the claim text.