Patent ID: 11946306
Assignee: ASSA ABLOY ENTRANCE SYSTEMS AB
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 0:
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.