Land vehicles – Wheeled – Extensible
Reexamination Certificate
1999-06-18
2001-03-20
Johnson, Brian L. (Department: 3618)
Land vehicles
Wheeled
Extensible
C280S650000, C280S657000, C280S047380
Reexamination Certificate
active
06203054
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a suspension for use in a foldable vehicle for babies or small children, or a stroller, used to carry a baby or small children thereon when going out for shopping, walk or travel, and more particularly to a suspension used in a stroller to effectively absorb, by a frame suspension mechanism and/or wheel suspension mechanism, shocks transmitted through the wheels from undulations, large or small, of the road surface when the stroller is moved on the road.
BACKGROUND ART
Many of the conventional suspensions used in strollers use a spring or the like interposed between the chassis and wheel of the stroller. In such conventional suspensions, the elasticity of the spring is utilized to absorb mainly shocks from irregularities or small undulations of the road surface when the stroller travels on the road.
However, all the road surfaces on which the stroller is used are not flat or have such small undulations or irregularities. Many roads are largely undulating, winding and bumpy. Some roads have steps. In addition, all indoor passages and ways are not free from steps, large or small. Namely, the conventional suspension mechanism to absorb only the shocks from small undulations or irregularities cannot enable the stroller to override or go over steps, so the stroller cannot be manipulated smoothly at an emergency. In these situations, a suspension mechanism has been demanded which is adapted to assure a stable travel of a stroller on road surface undulations, large or small, namely, to effectively absorb shocks transmitted through the wheels from bumpy road surfaces or steps.
Accordingly, the present invention has an object to overcome the drawbacks of the prior art by providing a stroller suspension which is adapted to assure a comfortable, stable travel of the stroller even on a bumpy or stepped road surface.
The present invention has an another object to provide a stroller provided with a shock absorbing device (frame suspension mechanism) to effectively absorb shocks from large road surface undulations.
The present invention has a still another object to provide a stroller provided with a shock absorbing device (wheel suspension mechanism) to effectively absorb shocks from small road surface undulations.
DISCLOSURE OF THE INVENTION
The above object can be attained by providing a suspension used in a stroller comprising an apron having a seat fixed thereon, a steering handle supporting piece pivoted to either rear lateral portion thereof, a pair of front frame members, right and left, each having a front wheel installed to a front end thereof via a wheel holder, a pair of rear frame members, right and left, each having a rear wheel installed to a read end thereof via a wheel holder, and guard support for a safety guard, the suspension having a frame suspension mechanism constructed as follows:
the rear end of the front frame member, front end of the rear frame member and the lower end of the guard support being pivotally connected together to a frame shaft traversed through the apron;
each of a pair of front links, right and left, being connected between a nearly middle portion of the front frame member and lower end of the handle supporting piece;
a pair of pair of rear links, right and left, being connected between a nearly middle portion of the rear frame member and the pivot of the handle supporting piece.
Also the above object can be attained by providing a suspension used in a stroller comprising an apron having a seat fixed thereon, a steering handle supporting piece pivoted to either rear lateral portion thereof, a pair of front frame members, right and left, each having a front wheel installed to a front end thereof via a wheel holder, a pair of rear frame members, right and left, each having a rear wheel installed to a read end thereof via a wheel holder, and guard support for a safety guard, the rear end of the front frame member, front end of the rear frame member and th lower end of the guard support being pivotally connected together to a frame shaft traversed through the apron, the suspension having a wheel suspension mechanism provided in the wheel holder installed to the lower end of each of the front and read frame members and which comprises:
a bearing support member having a flange formed at a front lower portion thereof and a leg portion formed at a rear lower portion thereof; and
a bearing member pivoted to a lower portion of the bearing support member to be rockable vertically about the pivot and housing a rubber bush block therein;
the bearing member having born in a rear portion thereof a wheel shaft on which a wheel is supported.
The above object can also be attained by providing a suspension for a stroller comprising an apron having a seat fixed thereon, a steering handle supporting piece pivoted to either rear lateral portion thereof, a pair of front frame members, right and left, each having a front wheel installed to a front end thereof via a wheel holder, a pair of rear frame members, right and left, each having a rear wheel installed to a rear end thereof via a wheel holder, and guard support for a safety guard, the suspension comprising:
a frame suspension mechanism constructed as follows:
the rear end of the front frame member, front end of the rear frame member and the lower end of the guard support being pivotally connected together to a frame shaft traversed through the apron; each of a pair of front links, right and left, being connected between a nearly middle portion of the front frame member and lower end of the handle supporting piece;
a pair of pair of rear links, right and left, being connected between a nearly middle portion of the rear frame member and the pivot of the handle supporting piece, and
a wheel suspension mechanism provided in the wheel holder installed to the lower end of each of the front and read frame members and which comprises:
a bearing support member having a flange formed at a front lower portion thereof and a leg portion formed at a rear lower portion thereof; and
a bearing member pivoted to a lower portion of the bearing support member to be rockable vertically about the pivot and housing a rubber bush block therein;
the bearing member having born in a rear portion thereof a wheel shaft on which a wheel is supported.
REFERENCES:
patent: 3653681 (1972-04-01), Virtue
patent: 4116465 (1978-09-01), Maclaren
patent: 4506907 (1985-03-01), Miyagi
patent: 4529219 (1985-07-01), Shamie
patent: 4575896 (1986-03-01), Nakano et al.
patent: 4608729 (1986-09-01), Huang
patent: 4610460 (1986-09-01), Kassai
patent: 4620711 (1986-11-01), Dick
patent: 4779879 (1988-10-01), Kassai
patent: 4831689 (1989-05-01), Lo
patent: 4844504 (1989-07-01), Bigo
patent: 5125676 (1992-06-01), Teng
patent: 5181735 (1993-01-01), Onishi
patent: 5388852 (1995-02-01), Bigo et al.
patent: 5590896 (1997-01-01), Eichhorn
patent: 5988670 (1999-11-01), Song et al.
patent: 811318 (1951-06-01), None
patent: 38-11533 (1963-06-01), None
patent: 48-5797 (1973-02-01), None
patent: 54-87558 (1979-06-01), None
English language abstract of JP 54-87558.
English language abstract of JP 38-11533.
English language abstract of JP 48-5797.
Avery Bridget
Form Design Corporation
Greenblum & Bernstein P.L.C.
Johnson Brian L.
LandOfFree
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