Patent ID: 8393054

Claim:
A door operator comprising: a first component configured as a first housing comprising at least one of a mechanical drive, a hydraulic drive, and an electrical drive, the first component having an end with a right-hand thread; a second component configured as a second housing comprising at least another one of a mechanical drive, a hydraulic device, and an electrical drive, the second component having an end with a left-hand thread; and a plug-in or rotatable coupling having two complementary threads, the coupling having an axial side and tenon holes on the axial side, each tenon hole configured to be engaged by a tenon of a tool, wherein first and second compartments are interconnected to each other by the coupling when the right-hand thread of the first compartment and the left-hand thread of the second compartment engage the respective complementary threads of the coupling, and wherein when interconnected to each other, the first and second housings have a common longitudinal axis, the door operator further comprises a hydraulic channel extending parallel to the longitudinal axis and through the first and second housings and wherein the first housing comprises a first hydraulic channel and the second housing comprises a second hydraulic channel, the door operator further comprising a connector disposed adjacent to an area where the first and second housings firmly abut each other, the first and second hydraulic channels being interconnected to each other by the connector.