US 11,903,510 B2
Extendable rail
Weiping Chen, Guangzhou (CN); and Jinbin Tan, Guangzhou (CN)
Assigned to GUANGDONG RAEX INTELLIGENT TECHNOLOGY CO., LTD., Guangzhou (CN)
Appl. No. 17/287,892
Filed by GUANGDONG RAEX INTELLIGENT TECHNOLOGY CO., LTD., Guangzhou (CN)
PCT Filed Dec. 31, 2019, PCT No. PCT/CN2019/130322
§ 371(c)(1), (2) Date Apr. 22, 2021,
PCT Pub. No. WO2021/008094, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 201921119266.2 (CN), filed on Jul. 16, 2019.
Prior Publication US 2021/0393067 A1, Dec. 23, 2021
Int. Cl. A47H 1/08 (2006.01); A47H 3/10 (2006.01); A47H 5/032 (2006.01)
CPC A47H 1/08 (2013.01) [A47H 3/10 (2013.01); A47H 5/0325 (2013.01)] 6 Claims
OG exemplary drawing
 
1. An extendable rail, comprising a main rail (1), an auxiliary rail (2) arranged in parallel with the main rail (1); the main rail (1) is shifted in longitudinal direction relative to the auxiliary rail (2) such that the rails are overlappingly positioned, and the main rail (1) has a main first end and a main second end opposite the main first end, the main rail comprising a driving wheel (11) at the main first end and a first reverse wheel (12) at the main second end; the auxiliary rail (2) has an auxiliary first end and an opposite auxiliary second end, the auxiliary first end is outwardly spaced from the main second end and comprises a second reverse wheel (21), and a transition arrangement at the auxiliary second end between the first and second main ends; the transition arrangement (3) comprises a transition casing (31) with a first guiding wheel (32) and a second guiding wheel (33) arranged inside;
a belt loop (4) with a fixed length is wrapped around a portion of the driving wheel (11), the first reverse wheel (12), the first guiding wheel (32), the second reverse wheel (21), the second guiding wheel (33), and another portion of the driving wheel (11) to form the loop.