A new life - irving reborn after near fatal accident

[FatFreddie]

How about this for a Heath Robinson solution...

Door is closed by a standard door closer.

Door is opened by string wound around a bobbin on an electric motor.

I haven't had time to look at interference between opener and closer but it should be possible to work around it.

Apologies for the dreadful drawings...

[irving2008]

lol, don't think my wife would accept a heath-robinson approach! having said that, I did look at a cable pull design, but the door closers don't give a positive closure against the draft proofing for the multipoint locking to engage, so needs to be an active pull closure as well. also needs a clutch/freewheel to allow manual opening of the door.

[Jonathan]

Designing a linear motor, in an arc shape, to embed in the floor would be a fun way to do it ...

The attractive forces between the armature and stator could be problematic (i.e. very rigid hinges required), but perhaps it could be a core-less motor to mitigate that. Line of magnets in the floor and a couple of coils on the door perhaps...

[mekanik]

If it's possible to access directly beneath or above the rotating centre of the door hinge, either from the top or under the floorboards you could install an extension shaft to the top/bottom of the door that is in alignment with the hinge axis with a geared wheel, and drive this with a worm(and suitable motor) the motor housing could be actuated to swing the worm out of engagement for manual operation.
Not had a windscreen wiper motor to bits in a lot years but if memory recalls they might have some usefull bits, if it would produce the required torque.
Regards
Mike

[irving2008]

If it's possible to access directly beneath or above the rotating centre of the door hinge, either from the top or under the floorboards you could install an extension shaft to the top/bottom of the door that is in alignment with the hinge axis with a geared wheel, and drive this with a worm(and suitable motor) the motor housing could be actuated to swing the worm out of engagement for manual operation.
Not had a windscreen wiper motor to bits in a lot years but if memory recalls they might have some usefull bits, if it would produce the required torque.
Regards
Mike

neither is possible, but such units do exist. They use a motor plus gear train, often a multistage epicyclic. Manual operation is achieved with a slipping clutch or just driving the motor in freewheel, so no worms..

[irving2008]

Designing a linear motor, in an arc shape, to embed in the floor would be a fun way to do it ...

The attractive forces between the armature and stator could be problematic (i.e. very rigid hinges required), but perhaps it could be a core-less motor to mitigate that. Line of magnets in the floor and a couple of coils on the door perhaps...

Fun but not practical with an engineered wood floor.., the hinges are easily up to the job. Equally you could have a curved section of r&p and a motor attached to the door, but aesthetically its crap...