Shinichi YAMAKAWA,Tsuyoshi ASHIDA,Takayuki NAKAMURA,Yasunori OHTA,Timothy P. SHERIDAN
申请号：
US14028047
公开号：
US20140012086A1
申请日:
2013.09.16
申请国别(地区):
US
年份:
2014
代理人:
摘要：
A self-propelling device includes a turning unit and a supporter. The supporter includes a first support sleeve, a second support sleeve and a cover formed respectively cylindrically. A drive wheel is secured to the first support sleeve in a rotatable manner. A pair of follower rollers are secured to the second support sleeve together. The cover is fitted on an outer surface of the second support sleeve externally, and disposed in the turning unit together with the second support sleeve. The turning unit is pressed by the follower rollers to the drive wheel. When the drive wheel rotates, the turning unit is circulated around the second support sleeve in a longitudinal direction of the first support sleeve. An inner wall of a body cavity will not be damaged, as the follower rollers are covered by the cover and do not appear externally even if the turning unit breaks.
