US 11,946,306 B2
Automatic door operator
Yong Chen, Suzhou Jiangsu (CN); and Jingfeng Zhang, Suzhou Jiansu (CN)
Assigned to Assa Abloy Entrance Systems AB, Landskrona (SE)
Appl. No. 17/441,981
Filed by Assa Abloy Entrance Systems AB, Landskrona (SE)
PCT Filed Mar. 27, 2020, PCT No. PCT/EP2020/058758
§ 371(c)(1), (2) Date Sep. 22, 2021,
PCT Pub. No. WO2020/201110, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 201910268086.9 (CN), filed on Apr. 3, 2019.
Prior Publication US 2022/0162897 A1, May 26, 2022
Int. Cl. E05F 15/622 (2015.01); E05F 15/63 (2015.01)
CPC E05F 15/622 (2015.01) [E05F 15/63 (2015.01); E05Y 2201/434 (2013.01); E05Y 2201/626 (2013.01); E05Y 2201/70 (2013.01); E05Y 2201/702 (2013.01); E05Y 2201/722 (2013.01); E05Y 2900/132 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An automatic door operator, comprising:
an actuating unit configured to output torque;
a lead screw having a first end connected to an output end of the actuating unit and a second end extending away from the output end;
a lead screw nut threadedly engaged with the lead screw;
a slider, wherein a first end of the slider is attached to the lead screw nut, wherein the slider is provided with a rack portion extending in a direction parallel to an axial direction of the lead screw, and during a movement of the lead screw nut from a first extreme working position away from the first end of the lead screw to a second extreme working position close to the first end of the lead screw, a length of an overlap of the rack portion and the lead screw in the axial direction increases;
a housing having a guide hole configured to be slidably engaged with the slider;
an output shaft mounted in a mounting hole disposed in the housing, wherein the output shaft has a gear portion positioned in the guide hole and engaged with the rack portion;
a guide rod affixed to a second end of the slider for movement therewith; and
a spring surrounding the guide rod,
wherein the spring is captive between an end of the guide rod and the housing, and wherein the spring is configured to be compressed when the lead screw nut moves toward the first end of the lead screw.