Door operator

1. 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.

2. The door operator of claim 1 , wherein the right-hand thread of the first component and the left-hand thread of the second component are female threads, and the complementary threads of the coupling are male threads.

3. The door operator of claim 1 , wherein the first housing is configured to accommodate mechanical elements of a cam drive or a piston drive, and wherein at least one of a spring compartment, a spring force adjusting device, a driving motor and a hydraulic pump is disposed in the second housing.

4. The door operator of claim 1 , further comprising one of a piston rod, a spring push-rod and a spindle, the one of a piston rod, a spring push-rod and a spindle penetrating the coupling.

5. The door operator of claim 4 , wherein the coupling has a sealing groove and a sealing ring which is disposed in the sealing groove and seals the one of a piston rod, a spring push-rod and a spindle with respect to one of the first and second housings.

6. The door operator of claim 1 , wherein the coupling has a sealing groove and a sealing ring which is disposed in the sealing groove and seals the coupling with respect to one of the first and second housings.

7. The door operator of claim 1 , wherein the door operator is a hydraulic door operator.