US 11,993,478 B2
Slow retraction mechanism, locking-type slow retraction device and winding device
Guizhong Ge, Huzhou (CN); and Xing Zou, Huzhou (CN)
Assigned to INTRADIN (HUZHOU) PRECISION TECHNOLOGY CO., LTD., Huzhou (CN)
Filed by INTRADIN (HUZHOU) PRECISION TECHNOLOGY CO., LTD., Huzhou (CN)
Filed on Jan. 25, 2022, as Appl. No. 17/583,459.
Claims priority of application No. 202110831893.4 (CN), filed on Jul. 22, 2021.
Prior Publication US 2022/0144581 A1, May 12, 2022
Int. Cl. B65H 75/38 (2006.01); B65H 75/44 (2006.01)
CPC B65H 75/4447 (2013.01) [B65H 75/4428 (2013.01); B65H 2701/33 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A slow retraction mechanism, wherein the slow retraction mechanism is configured to be adapted to a winder; the winder comprises a main shaft and a main body; the main body is rotatably sleeved on the main shaft; the main body is configured to rotate around the main shaft to wind or unwind a flexible material; the slow retraction mechanism comprises:
a blocking part;
a decelerating part; and
a first elastic part;
wherein the blocking part is fixedly connected with the main shaft;
the decelerating part is rotatably arranged on the main body; a projection of the decelerating part along an axial direction of the main shaft falls within a projection of the blocking part along the axial direction of the main shaft; when the main body rotates around the main shaft in a first direction to wind the flexible material, the decelerating part is configured to rotate relative to the main body along a second direction opposite to the first direction to approach the blocking part; the decelerating part is also configured to be in contact with and rub against the blocking part to reduce a rotation speed of the main body in the first direction; and
the first elastic part is arranged on the main body and connected to the decelerating part; and the first elastic part is configured to apply an elastic force on the decelerating part to hinder the decelerating part from rotating in the second direction.