US 12,421,781 B2
Device for opening or closing of a window or door and a system and method for controlling and management of the air quality of indoor premises
Gabriel Todorov Todorov, Sofia (BG); and Krasimir Georgiev Slavchev, Sofia (BG)
Assigned to Bulinfo Eood, Sofia (BG)
Appl. No. 17/800,638
Filed by BULINFO EOOD, Sofia (BG)
PCT Filed Feb. 23, 2021, PCT No. PCT/EP2021/054409
§ 371(c)(1), (2) Date Aug. 18, 2022,
PCT Pub. No. WO2021/170563, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 20472001 (EP), filed on Feb. 26, 2020.
Prior Publication US 2023/0073483 A1, Mar. 9, 2023
Int. Cl. E05F 15/619 (2015.01); G05B 15/02 (2006.01)
CPC E05F 15/619 (2015.01) [G05B 15/02 (2013.01); E05Y 2201/434 (2013.01); E05Y 2201/656 (2013.01); E05Y 2201/724 (2013.01); E05Y 2900/132 (2013.01); E05Y 2900/148 (2013.01)] 14 Claims
OG exemplary drawing
 
1. An external device for automatically opening/closing of a window or a door, consisting of
a housing with a mounting means (3) for fixed attachment to an opening sash or to a frame of 5 a window/door, wherein in the housing are arranged:
a stepper motor (16) with an electronic control unit (12) comprising a driver and controller with a microprocessor adapted to supply control pulses for a direction, speed and rate of the motor's rotation, and with a power source connection means (18),
means for transforming the motor's rotational motion into a linear (9, 13),
an extended flexible connection (10, 11) that is rigid in its extension direction and is flexible in more than one direction transversely to its extension, said directions laying in different planes, wherein said flexible connection consist of a flexible wire (10) along which numerous rigid bead-like elements (11) are threaded, said bead-like elements (11) having a central trough channel for the flexible wire (10) and are adjacent to and touch each other, the flexible connection being located in a leading groove (30) in the housing with at least one curved section for changing direction of movement of the flexible connection, wherein one end of the flexible connection being connected to the motion-transforming means and the other end of the flexible connection passing freely through an opening in the housing and being connected to a support element (1) that has means for attaching to window/door frame, wherein the motion-transforming means (9,13) is adapted to move the flexible connection (10, 11) reciprocating between front-end and rear-end final positions so that when the axis of the motor (16) is rotated in one direction the flexible connection is retracted into the housing to the rear-end final position and pulls the support element (1) and when the axis of the motor (16) is rotated in opposite direction, the flexible connection extends beyond the housing to the front-end final position and pushing the support element (1).