US 12,320,401 B2
Reinforced coil spring of a hose reel
Yujun Shao, Zhejiang (CN)
Assigned to YONGKANG HAILI INDUSTRIAL CO., LTD., Yongkang (CN)
Appl. No. 17/777,941
Filed by YONGKANG HAILI INDUSTRIAL Co., Ltd., Zhejiang (CN)
PCT Filed Aug. 26, 2021, PCT No. PCT/CN2021/114712
§ 371(c)(1), (2) Date Jan. 12, 2023,
PCT Pub. No. WO2023/279500, PCT Pub. Date Jan. 12, 2023.
Claims priority of application No. 202110777416.4 (CN), filed on Jul. 9, 2021.
Prior Publication US 2024/0167528 A1, May 23, 2024
Int. Cl. F16F 1/12 (2006.01); B65H 75/48 (2006.01); F16F 1/10 (2006.01)
CPC F16F 1/12 (2013.01) [B65H 75/48 (2013.01); F16F 2238/022 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A reinforced coil spring of a hose reel, comprising: a coil spring formed by coiling a coil spring leaf,
an outer end tip of the coil spring being bent to form an ear hook, and
an opening of the ear hook being located on an outer side of an outermost spring-coil,
wherein a steel leaf spring is arranged on an inside surface of the outermost spring-coil, an outer end tip of the steel leaf spring and the outermost spring-coil are fixedly connected, and
wherein an inner end tip of the steel leaf spring is located between the outermost spring-coil and a second-outer spring-coil;
wherein the steel leaf spring is provided with a plurality of first riveting holes, wherein the back surface of the steel leaf spring is provided with a positioning protrusion, wherein the positioning protrusion is located among the plurality of first riveting holes, wherein the outermost spring-coil is provided with a plurality of second riveting holes, wherein the outermost spring-coil is provided with a positioning hole matched with the positioning protrusion, and wherein the positioning hole is located among the plurality of second riveting holes.