Patent · US Active

Door actuator for opening and/or closing a door

US11578522B2 · kind B2 · utility

1Cited by

7References

15Claims

0Family size

Assignee

DORMAKABA DEUTSCHLAND GMBH · DE

Inventors

Alexander Hellwig · Ennepetal, DE
Thomas Salutzki · Ennepetal, DE
Sabine Weimann · Ennepetal, DE

Key dates

Filing date	May 18, 2021
Grant date	Feb 14, 2023
Priority date	—
Expiry date	Jun 4, 2041

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE05Y2900/134
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

A door actuator for opening and/or closing a door, includes a fluid housing with an inner compartment, which is filled with fluid, in particular hydraulic oil, a fluid housing opening in the fluid housing for draining the fluid at thermal overload, a thermally activatable valve for opening, which closes the fluid housing opening, and a collecting device, which is disposed outside the fluid housing opposite the fluid housing opening, forms a collecting space for the fluid, is open towards the fluid housing opening, and includes at least one drain opening for draining the fluid from the collecting space.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.