Automobile having selective drive wheels

A toy automobile having selective drive wheels comprising a body, a chassis and pairs of front and rear wheels, in which either a front wheel windup spring drive unit or a freewheel holder along with a front axle is detachably arranged in a front space of the chassis, and in which either a rear wheel windup spring drive unit or a freewheel holder along with a rear axle is detachably arranged in a rear space of the chassis, whereby a selection between front wheel drive, rear wheel drive, four-wheel drive or four-freewheel is made possible.

BACKGROUND OF THE INVENTION 
The present invention relates to a toy automobile having selective drive 
wheels. 
In a conventional toy automobile, in general, rear wheels are driven by a 
windup spring drive unit disposed in a rear space of a body. This windup 
spring drive unit is comprised of a casing, a windup spring arranged in 
the casing, a plurality of gear wheels which are arranged in the casing 
and connected to the windup spring, and an output shaft to which the rear 
wheels are mounted. In this case, in order to change from rear wheel drive 
to front wheel drive, it seems that such a change can be easily conducted 
by reversing the direction and the mount position of the windup spring 
drive unit. However, in the toy automobile, since the height of the front 
space of the body is lower than that of the rear space of the body, the 
installation space of the drive unit in the front space is smaller than 
that in the rear space. Accordingly, by simply reversing the direction of 
the windup spring rear wheel drive unit and changing its mounting position 
from the rear space to the front space, the drive unit cannot be contained 
within the front space, nor can the front wheel axle be positioned in a 
proper site. In order to properly install the rear wheel drive unit in the 
front space of the body, it should be reduced in relation to the entire 
size of the toy automobile. If the windup spring drive unit is diminished, 
its drive force will be lessened and hence the operation of the toy 
automobile will be considerably less interesting. 
SUMMARY OF THE INVENTION 
Accordingly, it is an object of the present invention to provide a toy 
automobile having selective drive wheels, free from the aforementioned 
defects and disadvantages of the prior art, which is capable of readily 
selecting either front wheel drive, rear wheel drive, four-wheel drive or 
four-freewheel by means of a simple operation, and which because of this 
above capability, is very enjoyable to use. 
In accordance with one embodiment of the invention, there is provided a toy 
automobile having selective drive wheels, comprising a body, a chassis 
having front and rear spaces, detachably mounted to the body, a pair of 
front wheels which are rotatably mounted to the chassis through either a 
front wheel windup spring drive unit or a first freewheel holder 
detachably arranged in the front space of the chassis, and a pair of rear 
wheels which are rotatably mounted to the chassis through either a rear 
wheel windup spring drive unit or a second freewheel holder of the same 
type as the first freewheel holder--detachably--arranged in the rear space 
of the chassis, whereby a selection between front wheel drive, rear wheel 
drive, four-wheel drive or four-freewheel is made possible. 
Other and further objects, features and advantages of the invention will 
appear more fully from the following description taken in connection with 
the preferred embodiments thereof with reference to the accompanying 
drawings, in which:

DESCRIPTION OF THE PREFERRED EMBODIMENTS: 
Referring now to the drawings, wherein like reference numerals designate 
similar or corresponding components throughout the different figures and 
hence a description or the structure and function of such like components 
can be omitted for the sake of brevity, there is shown in FIGS. 1-5 a toy 
automobile having selective drive wheels according to the present 
invention. 
In the drawings, the toy automobile A having selective drive wheels 
comprises a body 1, a chassis 2, a front wheel windup spring drive unit or 
a first drive unit 3, a rear wheel windup spring drive unit or a second 
drive unit 4 and a freewheel holder 5; any two of the members 3, 4 and 5 
are selectively mounted to the chassis 2. 
The chassis 2 is detachably mounted to the body 1 and is provided with a 
container portion 8 therein which is divided into a front half space and a 
rear half space. Either the first drive unit 3 for driving front wheels a 
or the freewheel holder 5 for retaining freewheels c is detachably 
arranged in the front half space, and either the rear drive unit 4 for 
driving rear wheels b or the freewheel holder 5 for retaining freewheels c 
is detachably arranged in the rear half space. The chassis 2 is further 
provided with pairs of slits 9 and 10 in the side walls of the front and 
rear portions of its container portion 8, through which the front and the 
rear wheel axles are inserted. The chassis 2 is also provided with 
engaging projections 12 in the upper inner middle portions of the side 
walls of the container portion 8, a pair of grooves 13 in the lower side 
portions of the front end wall of the container portion 8, a pair of slots 
14 in the lower side portions of the rear end wall of the container 
portion 8, and front and rear holes 16 in the center portions of its front 
and rear end plate portions corresponding to female screw holes 15 formed 
in the front and the rear ends of the body 1. 
The first windup spring drive unit 3 comprises a casing 18 having half the 
length of the container portion 8 of the chassis 2, the front upper 
portion of the casing 18 being gradually diminished so as to be reduced to 
a minimum; a combination of a windup spring (not shown) and a plurality of 
speed reduction gear wheels (not shown) connected thereto is included in 
the casing 18; and an output shaft 17 which projects sideways from the 
casing 18 in its lower front end portion and to which the front wheels a 
are secured. The casing 18 is provided with a pair of engaging grooves 20 
in the middle rear end portions of its side faces, with which the engaging 
projections 12 of the container portion 8 of the chassis 2 are engaged, 
and a pair of front projections 21 in the lower side portions of its front 
end wall, which are inserted into the grooves 13 formed in the front end 
of the container portion 8 of the chassis 2. The distance L.sub.1 between 
the front end and the output shaft 17 of the first drive unit 3 is 
approximately the same as the distance between the inlets of the grooves 
13 and the front axle slits 9 of the container portion 8 of the chassis 2. 
The second windup spring drive unit 4 has almost the same appearance as the 
first drive unit 3, except that an output shaft 19 projects sideways from 
its casing 18 in the lower middle portion and the rear wheels b are 
secured to the output shaft 19. In this case, the rear upper portion of 
the casing 18 is gradually diminished. The distance L.sub.2 between the 
rear end and the output shaft 19 of the second drive unit 4 is 
approximately the same as the distance between the rear end wall and the 
rear axle slits 10 of the container portion 8 of the chassis 2. Since the 
front space in which the first drive unit 3 is arranged is narrower than 
the rear space in which the second drive unit 4 is arranged, the distance 
L.sub.2 is longer than the distance L.sub.1. 
A conventional windup spring drive unit can be used for the second drive 
unit 4. However, since the casing 18 of the first drive unit 3 is 
symmetrically formed to the casing 18 of the second drive unit 4, the 
first drive unit 3 has one more gear wheel than the second drive unit 4. 
The freewheel holder 5 having a form similar to an automobile engine is 
provided with pairs of front and rear axle holding slits 22 and 23 at 
distances L.sub.1 and L.sub.2 from its front end wall corresponding to 
the axle distances L.sub.1 and L.sub.2 from the front and the rear end 
walls of the first and the second drive units 3 and 4, and a pair of front 
projections 21 formed in the same manner as the front projections 21 of 
the first drive unit 3. The height H.sub.1 of the freewheel holder 5 is 
substantially the same as that of the engaging projections 12 of the 
container portion 8 of the chassis 2. 
A pair of front and rear bumpers 6 and 7, each having a hole in the central 
portion of its upper flat plate portion, are mounted between the body 1 
and the chassis 2 in their front and rear ends by using screw bolts, as 
clearly shown in FIG. 5. 
The front wheel drive toy automobile is assembled as follows. To begin 
with, the first drive unit 3 is disposed in the front half space of the 
container portion 8 of the chassis 2 by engaging the front projections 21 
of the first drive unit 3 with the grooves 13 of the container portion 8 
while the front axle or the output shaft 17 of the first drive unit 3 is 
fitted in the front slits 9 of the container portion 8 of the chassis 2. 
Then, a rear axle to which the rear wheels b are secured, is fitted in the 
rear slits 10 of the container portion 8, and the freewheel holder 5 is 
arranged in the rear half space of the container portion 8 by inserting 
the projections 21 of the freewheel holder 5 into the slots 14 of the 
container portion 8 of the chassis 2. On this occasion, the engaging 
projections 12 of the container portion 8 of the chassis 2 are engaged 
with the engaging grooves 20 of the first drive unit 3 and the upper rear 
side ends of the freewheel holder 5, thereby ensuring the mounting of 
these two members in the container portion 8 of the chassis 2. Then, the 
chassis 2 is mounted to the body 1 along with the front and the rear 
bumpers 6 and 7 by tightening the screw bolts inserted through the holes 
16 of the chassis 2 via the holes of the front and the rear bumpers 6 and 
7 into the screw holes 15 of the body 1. 
Next, the rear wheel drive toy automobile is assembled as follows. The 
second drive unit 4 is arranged in the rear half space of the container 
portion 8 of the chassis 2 in a manner similar to the first drive unit 3, 
as described above, by inserting the projections 21 of the rear drive unit 
4 into the slots 14 of the container portion 8 of the chassis 2, and then 
the freewheel holder 5 is mounted into the front half space of the 
container portion 8 in a manner similar to the freewheel holder 5 mounted 
in the container portion 8 of the front wheel drive toy automobile, as 
hereinbefore described, by inserting the projections 21 of the freewheel 
holder 5 into the grooves 13 of the container portion 8 of the chassis 2. 
Then, the chassis 2 is mounted to the body 1 along with the front and the 
rear bumpers 6 and 7, in the same manner as described above in the case of 
the front wheel drive toy automobile. 
In these two examples, when the freewheel holder 5 is arranged in the rear 
half space of the container portion 8 of the chassis 2, the rear freewheel 
axle is fitted in the rear axle holding slits 23 of the freewheel holder 
5, and, when the freewheel holder 5 is arranged in the front half space of 
the container portion 8, the front freewheel axle is fitted in the front 
axle holding slits 22 of the freewheel holder 5. 
When the four-wheel drive toy automobile is assembled, the first and the 
second drive units 3 and 4 are arranged in the front and the rear half 
spaces of the container portion 8 of the chassis 2 in the same manner as 
the above described examples, and the chassis 2 and the body 1 are coupled 
together along with the front and the rear bumpers 6 and 7, also in the 
same manner as above. 
When the four-freewheel toy automobile is assembled, two freewheel holders 
5 are fitted in the front and the rear half spaces of the container 
portion 8 of the chassis 2, and then the chassis 2 is mounted to the body 
1 along with the front and the rear bumpers 6 and 7, in the same manner as 
described above. 
It is readily understood from the above description that a choice between 
either front wheel drive, rear wheel drive, four-wheel drive or 
four-freewheel is made possible in a toy automobile by either detachably 
mounting the first drive unit or a freewheel holder along with freewheels 
secured to a front axle into a front half space of a container portion of 
a chassis, or detachably mounting the second drive unit or the freewheel 
holder along with a rear axle to which freewheels are secured, into a rear 
half space of the container portion of the chassis, and that because of 
this capability to operate a toy automobile according to the present 
method using any of the aforementioned choices, it is very enjoyable to 
use. 
Although the present invention has been described in its preferred 
embodiment with reference to the accompanying drawings, it is readily 
understood that various changes and modifications may be made without 
departing from the spirit and scope of the present invention.