Land vehicles – Wheeled – Stable vehicles – handle-propelled
Reexamination Certificate
2002-07-18
2003-12-16
Lerner, Avraham (Department: 3611)
Land vehicles
Wheeled
Stable vehicles, handle-propelled
C280S267000, C280S269000
Reexamination Certificate
active
06663122
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a stroller frame. More particularly, the present invention relates to a stroller frame which has a steering device to provide a steering effect and a shock absorbing effect for a front wheel.
Referring to
FIG. 1
, a conventional tricycle stroller frame
1
has a front frame
12
, a handle push frame
11
, a rear frame
10
, two connectors
15
, and two base rods
13
. Two joints
14
are connected to the front frame
12
, the handle push frame
11
, and the rear frame
10
. A front wheel
131
is supported by the base rods
13
. Each connector
15
is connected to the rear frame
10
, one of the base rods
13
, and a rear wheel
101
. However, the front wheel
131
cannot be deflected.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a stroller frame which has a steering device to provide a steering effect for a front wheel.
Another object of the present invention is to provide a stroller frame which has a steering device to provide a shock absorbing effect for a front wheel.
Accordingly, a stroller frame comprises a steering device, two front wheel support rods, and two front wheels. The steering device is disposed on the front wheel support rods. The steering device has a positioning device, a front base seat, a shock absorbing device, and a pair of shock absorbers. The positioning device has two positioning blocks disposed on the front wheel support rods, two sleeves disposed on the positioning blocks, and a connection bar connected to the positioning blocks. A pivot rod fastens the steering device and the front wheel support rods together. The front base seat has two side link devices, a center block, two front protruded blocks, a connection rod, and two lugs. Each of the lugs is disposed on an end of the corresponding side link device. The connection rod is disposed between the lugs. A shaft passes through the front base seat. The shaft is connected to the front wheels. A ball is disposed on a bottom of the front base seat. A tension spring is connected to the connection rod and the ball. The shock absorbing device is disposed between the connection bar and the center block. Each of the shock absorbers is disposed between the corresponding sleeve and the corresponding front protruded block.
REFERENCES:
patent: 4020914 (1977-05-01), Trautwein
patent: 4527665 (1985-07-01), Shamie
patent: 4546997 (1985-10-01), Smyers
patent: 4913452 (1990-04-01), Zun
patent: 5103530 (1992-04-01), Andrisin et al.
patent: 5257799 (1993-11-01), Cone et al.
patent: 5364119 (1994-11-01), Leu
patent: 5581843 (1996-12-01), Purnell
patent: 5984332 (1999-11-01), Beaudoin et al.
patent: 2003/0122332 (2003-07-01), Engels et al.
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