Shutter means operated by fan motor

Claim 2

A ventilator comprising a motor driven fan, a switching mechanism operable by actuation of pulling cord to form a closed electrical circuit for the operation of said fan motor, clutch means operable in response to the electroconductive operation of said switching mechanism to bring said fan motor into driving connection with a drive mechanism for the actuation of shutter means, a clutch releasing mechanism operable to render said clutch means inoperative when said shutter means are in fully opened position, locking means operable to hold said shutter means in fully opened position in synchronism with the clutch releasing operation of said clutch releasing mechanism and a mechanism operable by the breaking operation of said switching mechanism to cancel said clutch releasing operation and the locking operation of said locking means.

Claim 3

A ventilator comprising a motor driven fan having a pinion fixed to the rotational axle thereof, shutter means biassed by a spring toward a closed position and connected with a length of wire for the opening-closing operation of said shutter means, an electrical switch for said fan motor, said switch being adapted to be actuated by a pulling cord, a reduction gear mechanism including a clutch gear adapted to be brought into meshing engagement with said pinion when said electrical switch is closed, a drum member mounted on said reduction gear mechanism for taking-up said wire, the load of taking-up of said wire being effective to disengage said clutch gear from said pinion, a first locking plate for preventing the disengagement of said clutch gear from said pinion for a moment and, after said wire is taken up a length corresponding to a predetermined stroke thereof, permitting said clutch gear to be disengaged from said pinion, a second locking plate for preventing said reduction gear mechanism from being rotated in the reversed direction by said load of taking-up of said wire, said first and second locking plates being ineffective to lock when said electrical switch is opened.

Claim 4

A ventilator comprising a motor driven fan having a pinion fixed to the rotational axle thereof, shutter means biassed by a spring toward a closed position and connected with a length of wire for the opening-closing operation of said shutter means, an electrical switch for said fan motor, said switch being adapted to be actuated by a pulling cord, a reduction gear mechanism including a clutch gear adapted to be brought into meshing engagement with said pinion when said electrical switch is closed, a drum member mounted on said reduction gear mechanism for taking-up said wire, the load of taking-up of said wire being effective to disengage said clutch gear from said pinion, a first locking plate for preventing the disengagement of said clutch gear from said pinion for a moment and, after said wire is taken up a length corresponding to a predetermined stroke thereof, permitting said clutch gear to be disengaged from said pinion, a second locking plate for preventing said reduction gear mechanism from being rotated in the reversed direction by said load of taking-up of said wire, said first and second locking plates being ineffective to lock when said electrical switch is opened.