Patent ID: 9447622
Filing Date: 2016-09-20
CPC Classification: E05F,E05Y,Y10T

Claim Text:
1. A door operating device, comprising a housing, at least one drive unit which is disposed in the housing and can be coupled to a door leaf, and at least one spring energy accumulator, which is in operative connection with the drive unit, and which includes a spring disposed therein under spring pretension, wherein the spring pretension of the spring is realized by means of a spring adjusting device, which comprises at least one screwed sealing plug, which can be connected to the housing, and an adjusting nut, wherein a cylinder is configured at the screwed sealing plug and oriented towards the spring, at which cylinder the adjusting nut is linearly guided, wherein a setting element extends through the screwed sealing plug and, at least in sections, can be brought into a non-positive and positive engagement with the cylinder, and which bears against the adjusting nut, serves to adjust the spring pretension.