US 12,442,486 B2
Extendable support leg
Jie Li, Zhongshan (CN); and Fan Xiao, Zhongshan (CN)
Assigned to Guangdong Sirui Optical Co., Ltd., Zhongshan (CN)
Filed by Guangdong Sirui Optical Co., Ltd., Zhongshan (CN)
Filed on Nov. 27, 2023, as Appl. No. 18/520,193.
Claims priority of application No. 202310366654.5 (CN), filed on Apr. 6, 2023; and application No. 202320754150.6 (CN), filed on Apr. 6, 2023.
Prior Publication US 2024/0337348 A1, Oct. 10, 2024
Int. Cl. F16M 11/32 (2006.01); G03B 17/56 (2021.01)
CPC F16M 11/32 (2013.01) [G03B 17/561 (2013.01); F16M 2200/025 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A telescopic support leg comprising:
a top leg tube, a middle leg tube and a bottom leg tube, wherein the top leg tube, the middle leg tube and the bottom leg tube are relatively circumferentially fixed while extending or contracting telescopically;
a locking control assembly installed at one end of the front leg tube comprises a rotating rod with one end extending into the front leg tube and being rotatable;
a first locking component comprises a movable tube, a limiting plate, an inner brace, and a support brace located in the front leg tube; wherein the movable tube is connected to the rotating rod, and is circumferentially fixed and axially sliding relative to the rotating rod;
wherein the limiting plate is fixed on an outer periphery of the movable tube;
wherein the limiting plate comprises an annular groove;
wherein the inner brace is fixedly connected to the middle leg tube via threads connected to the outer circumference of the movable tube;
wherein the support brace and the limiting plate are relatively axially fixed and disposed outside the inner brace;
wherein the support brace supporting the inner wall of the front leg tube under the action of the inner brace and is in contact with the inner wall of the front leg tube to provide a locking state or a loosen state;
wherein the support brace comprises a buckle extending into the annular groove;
wherein the buckle is in contact with the annular groove;
a second locking component comprises an inner tube relatively axially fixedly connected to the movable tube and located inside the middle leg tube, and is sleeved on the rear section;
an elastic sleeve is disposed around an outer circumference of the leg tube and is fixedly connected to the middle leg tube;
when the inner tube and the elastic sleeve move relative to each other in the axial direction, the elastic sleeve is in the locking state that partially extends into the inner tube to lock on the outer wall of the rear leg tube, and is separated from the inner tube to release the rear leg tube in the loosen state.