Stair climbing device

Details Stair climbing device Stair climbing device

2011-07-19

2011-07-19

Silbermann, Joanne (Department: 3611)

Motor vehicles

Special driving device

Portable track

C180S008100

Reexamination Certificate

active

07980337

ABSTRACT:
The present invention provides a device for safely and conveniently conveying an object on a slope. The safety feature includes a fail-safe one-way brake comprising a ratchet wheel, a pawl and a biasing means. In one embodiment, the device is foldable; in another embodiment, the device is integrated with a suitcase; in yet another embodiment, the device is motorized.

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patent: 3713501 (1973-01-01), Hurt
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patent: 4645022 (1987-02-01), Bergquist
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patent: 6155362 (2000-12-01), Owens
patent: 7779940 (2010-08-01), Demetrulias
patent: 2004/0094378 (2004-05-01), Gandy
patent: 2659285 (1991-09-01), None
patent: 2001315646 (2001-11-01), None

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