Land vehicles – Wheeled – Coasters
Reexamination Certificate
1999-03-04
2001-05-01
Swann, J. J. (Department: 3611)
Land vehicles
Wheeled
Coasters
CD12S130000
Reexamination Certificate
active
06224077
ABSTRACT:
BACKGROUND OF THE INVENTION
A baby walker is a kind of children's apparatus having an upper frame (bracket table) and a lower frame (chassis) with wheels. A baby seat is hung under the bracket table. The conventional baby walker has no height-adjustment mechanism and its height can be adjusted only by the stepped sections on the seat frame. As people's living standards are improved, they demand a height-adjustment mechanism (the lifting gear) for a baby walker which not only fits the height of each baby but also adjusted to the the growth of a baby. Some conventional baby walkers use a crossed rod support for a height adjustment gear which can control the included angle of the cross-rod by means of a ratchet down slot under the bracket table to position and control the height of the baby walker.
PRIOR ART OF THE INVENTION
A conventional baby walker either has no lifting gear for its bracket table or has only a stepped section on the seat frame to adjust the height of the seat for a baby.
FIELD OF THE INVENTION
A link lifting gear for a baby walker relates to a gear which has a pair of links controlled by a wedge, a slide and a spring to change the distance between the two links so as to adjust the height of the baby walker.
REFERENCES:
patent: 517403 (1894-03-01), Bradish
patent: 4433869 (1984-02-01), Payne, Jr. et al.
patent: 4576392 (1986-03-01), Quinlan, Jr.
patent: 5324064 (1994-06-01), Sumser et al.
patent: 5351978 (1994-10-01), Chen
patent: 5564724 (1996-10-01), Huang
patent: 5820527 (1998-10-01), Lai
patent: 6048290 (2000-04-01), Chen et al.
Harrison & Egbert
McClellan James S.
Swann J. J.
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