Title:
FOLDABLE SPIDER WHEEL FOR ASCENDING AND DESCENDING STAIRS
Document Type and Number:
WIPO Patent Application WO2006045107
Kind Code:
A3
Abstract:
A collapseable spider wheel assembly on a towing device enables storage of the device into a standard rectangular space. Once collapsed, the collapsible spider assembly is protected within the body of the towing device. Furthermore, actuation of the folding and unfolding may be accomplished through the usual telescoping of the carrying handle of such a device, such as in a suitcase embodiment. While the spider wheels are in the open position, the carrying apparatus may exert a drive force to climb up stairs and braking force to descend stairs. The unit operates as a normal wheeled carrying apparatus while traversing a horizontal surface.
Inventors:
YANG MICHAEL (US)
KAMARA STEVEN (US)
FOLLETTE DAVID (US)
KAMARA STEVEN (US)
FOLLETTE DAVID (US)
Application Number:
PCT/US2005/038221
Publication Date:
August 31, 2006
Filing Date:
October 18, 2005
Export Citation:
Assignee:
YANG MICHAEL (US)
KAMARA STEVEN (US)
FOLLETTE DAVID (US)
KAMARA STEVEN (US)
FOLLETTE DAVID (US)
International Classes:
B60B1/00; B60B3/00; B62B1/00; B62B3/00; B62B11/00
Foreign References:
| US3283839A | 1966-11-08 | |||
| US4061199A | 1977-12-06 | |||
| JPS61146686A | 1986-07-04 | |||
| US5044650A | 1991-09-03 | |||
| US6435538B2 | 2002-08-20 | |||
| US6357765B1 | 2002-03-19 | |||
| US4790548A | 1988-12-13 | |||
| US4457526A | 1984-07-03 | |||
| US4142732A | 1979-03-06 |
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