Land vehicles – Wheeled – Occupant propelled type
Reexamination Certificate
2001-10-01
2003-05-13
Dickson, Paul N. (Department: 3616)
Land vehicles
Wheeled
Occupant propelled type
Reexamination Certificate
active
06561534
ABSTRACT:
BACKGROUND OF THE PRESENT INVENTION
1. Field of Invention
The present invention relates to a twist vehicle, and more particularly to a twist vehicle having a rear operation system, wherein the steering unit of the twist vehicle is mounted in a relatively rear position with respect to vehicle frame of the twist vehicle.
2. Description of Related Arts
As shown in
FIG. 1
of the drawings, a conventional twist vehicle comprises a vehicle frame
1
, a pair of rear wheels
11
rotatably mounted on two sides of rear portion of vehicle frame
1
to support the twist vehicle, a pivot
13
, a twisting unit
14
having two driving wheels space apart from each other and from the pivot
13
, and a handle
15
connected to the twisting unit
14
. The twisting unit
14
is pivotally connected to the vehicle frame
1
about the pivot
13
. To operate the conventional twist vehicle, a rider has to impart clockwise and anti-clockwise movements subsequently to the handle
15
, thus to make the twisting unit
14
to rotate and then the pair of driving wheels
12
to turn accordingly about the pivot
13
. Amid a series of such turning motions of the driving wheels
12
, the twist vehicle moves forwardly.
Since the pair of driving wheels are turned about the pivot
13
, so, the longer the perpendicular distance between the pivot
13
and the handle
15
, the less the force a rider has to apply to the handle
15
for the same turning moment. However, the longer the perpendicular distance between the pivot
13
and the handle
15
, the less comfort the rider should feel as the rider must lean forward to turn the handle
15
. Therefore, this kind of conventional twist vehicle is undesirable from the viewpoint of ergonomics.
Thereafter, the conventional twist vehicle is improved as shown in
FIG. 2. A
more recent twist vehicle comprises a vehicle frame
1
, a pair of rear wheels
11
for supporting the vehicle frame
1
, a steering unit
15
, a transmission unit
150
and a triangular twisting unit
120
having one end portion connected to the transmission unit
150
and remaining two end portions connected to a pair of driving wheels
12
respectively. The transmission unit
150
is rotatably and perpendicularly connected to the vehicle frame
1
. When clockwise and anti-clockwise movements are subsequently imparted to the steering unit
15
, the transmission unit
150
and therefore the twisting unit
120
turn accordingly as a result, causing the twist vehicle to move forwardly. The steering unit
15
of this kind of more recent twist vehicle extended upwardly and perpendicularly with respect to the vehicle frame
1
, rather than frontwardly as shown in
FIG. 1
, thus preventing a rider from leaning forwardly. However, since the twisting unit
120
is directly connected to the transmission unit
150
which is connected to the steering unit
15
, therefore, the more backward the steering unit is positioned with respect to the vehicle frame, the shorter the distance between the axle of the pair of driving wheels
12
and axle of the pair of rear wheels
11
, and hence the easier the twist vehicle to flip over.
SUMMARY OF THE PRESENT INVENTION
A main object of the present invention is to provide a twist vehicle which comprises a rear operation system wherein the steering unit of the twist vehicle can be mounted at a relatively backward position such that a rider is able to operate the twist vehicle comfortably, without affecting the axle distance between the pair of driving wheels and the pair of rear wheels of the twist vehicle.
Another object of the present invention is to provide a twist vehicle which comprises a rear operation system wherein the steering unit of the twist vehicle can be mounted inclinedly with respect to the vehicle frame such that a rider is able to operate the twist vehicle comfortably, without affecting the axle distance between the pair of driving wheels and the pair of rear wheels of the twist vehicle.
Another object of the present invention is to provide a twist vehicle which comprises a rear operation system which comprises a driven member which is connected to twisting unit of the twisting vehicle, a driving member which is connected to steering unit of the twist vehicle and is backwardly apart from the driven member with respect to vehicle frame of the twist vehicle, and an endless transmission member, wherein the driven member and the driving member are mechanically connected by the endless transmission member belt, such that any rotating motions of the driving member can be transferred to the driven member by the endless transmission member.
To enable further understanding of the objects and the underlying technological method, the brief description of the drawing below is followed by a detailed description of a preferred embodiment.
REFERENCES:
patent: 3663038 (1972-05-01), Hendricks
patent: 3902739 (1975-09-01), Kimura
patent: 5029887 (1991-07-01), Grutzner et al.
patent: 6220609 (2001-04-01), Jones
patent: 6306065 (2001-10-01), Liang
patent: 6386304 (2002-05-01), Wang
Chan Raymond Y.
David and Raymond Patent Group
Dickson Paul N.
Fleming Faye M.
Gu Hong-Jiun
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