Door drive

Abstract

A door drive, in particular a rotary door drive, comprising a housing can be coupled to a door leaf or a window frame output shaft, a motor for driving the output shaft and a spring unit, during a respective opening movement of the door wing is stretched and relaxed during each closing movement of the door leaf, wherein the output shaft via a rack by the motor is drivable and the spring unit on the one hand on the toothed rack and on the other hand is supported via a stop on the housing for adjusting the spring force of the spring unit relative to the housing is adjustable.

Description

technical field [0001] The invention relates to a door driving device, especially a revolving door driving device, which comprises a housing, a driven shaft capable of coupling with a door leaf or a door frame, a motor and a spring unit for driving the driven shaft, the The spring unit is tensioned during a corresponding opening movement of the door leaf and relaxed during a corresponding closing movement of the door leaf. Background technique [0002] This type of door operator is used to close the leaf of a motor-operated door with spring force. This is of particular importance for smoke and fire doors, which must be closed quickly and reliably in the event of an alarm, in particular after responding to a smoke alarm or in the event of a power interruption. The spring unit is tensioned simultaneously with opening the door leaf. With the aid of the spring unit, the door operator thus closes the door leaf even in the event of a power failure, which is mandatory in the case...

AI Technical Summary

Problems solved by technology

Here, in order to adjust the spring unit accordingly, a large number of expensive parts are usually required

Although adjustment of the spring force of the spring unit is usually only carried out during assembly of the door operator, the effort required for this entails relatively high manufacturing costs

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