|국가/구분||United States(US) Patent 등록|
|국제특허분류(IPC7판)||B63C-009/08 B63C-009/00 B63B-035/58|
|발명자 / 주소|
|출원인 / 주소|
|인용정보||피인용 횟수 : 5 인용 특허 : 96|
A device comprises a spring and a sleeve. The spring is configured to form a closed loop. The spring is moveable between a coiled configuration when the spring is collapsed and an uncoiled configuration when the spring is expanded. The spring defines a circumference while in the uncoiled configuration. The spring is disposed within the sleeve.
What is claimed is: 1. An apparatus, comprising: a first flexible material having an outer perimeter portion; a second flexible material defining an interior volume and an inner perimeter portion, the inner perimeter portion of the second flexible material being coupled to the outer perimeter portion of the first flexible material; a spring disposed within the interior volume of the second flexible material, the spring forming a closed loop and being moveable between a coiled configuration when the spring is collapsed and an uncoiled configuration when ...