US 12,134,928 B2
Linear actuator, as well as closing/opening system that includes such actuator
Luciano Bacchetti, Nave (IT)
Filed by IN & TEC S.R.L., Brescia (IT)
Filed on Feb. 26, 2023, as Appl. No. 18/114,268.
Application 18/114,268 is a continuation in part of application No. 16/480,217, granted, now 11,619,088, previously published as PCT/IB2018/050667, filed on Feb. 2, 2018.
Claims priority of application No. 102017000011597 (IT), filed on Feb. 2, 2017; and application No. 102017000011628 (IT), filed on Feb. 2, 2017.
Prior Publication US 2023/0203870 A1, Jun. 29, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. E05F 15/56 (2015.01); E05F 15/50 (2015.01)
CPC E05F 15/56 (2015.01) [E05F 15/50 (2015.01)] 20 Claims
OG exemplary drawing
 
1. A linear actuator for moving a closing element, comprising:
a jacket defining an axis, said jacket including a first and a second opposite ends; and
a rod having an end cylinder slidable in a reciprocal relation with said jacket along said axis between a rest position and a working position,
wherein said end cylinder is inserted within said jacket so as to divide said jacket into a first and a second variable volume compartments fluidly independent of each other,
wherein one of the first or the second variable volume compartments is fluidically insulated and under vacuum, the other one of the first or the second variable volume compartments being fluidly communicating with an outside environment through one of the first or the second opposite ends to suck or discharge ambient air from or toward the outside environment,
wherein, upon a passage of said end cylinder from said rest position to said working position, said one of said first or said second variable volume compartments expands, causing said rod to be sucked and said end cylinder to return from the working position to the rest position,
wherein the other one of the first or the second opposite ends includes an abutment member, said end cylinder in said rest position being in contact with said abutment member, and
wherein said abutment member includes a non-return valve mechanism adapted to put selectively into fluid contact said one of the first or the second variable volume compartments with an outside environment upon contact with said end cylinder, so as to discharge possible undesired ambient air entrapped between said end cylinder and said abutment member.