Amusement devices: toys – Construction toy
Reexamination Certificate
2001-09-11
2002-09-03
Banks, Derris H. (Department: 3712)
Amusement devices: toys
Construction toy
C446S102000, C446S103000, C446S104000, C446S120000, C474S156000, C474S207000, C474S231000, C474S232000, C474S233000, C403S103000
Reexamination Certificate
active
06443795
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to a transmission chain for toys, more particularly to a length-adjustable transmission chain.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional toy
1
with a gear transmission assembly
13
is shown to comprise a base building block
11
with an array of connecting holes
111
, two supporting building blocks
12
spaced apart from each other and mounted removably on a top surface of the base building block
11
through the engagement between the connecting holes
111
in the base building block
11
and connecting posts (not shown) of the supporting building blocks
12
, and a gear transmission assembly
13
provided removably on the supporting building blocks
12
. The supporting building block
12
is formed with a plurality of holes
121
for mounting the connecting transmission shafts
16
′,
16
″ of the gear transmission assembly
13
. The gear transmission assembly
13
includes a plurality of large-diameter gears
14
,
14
′,
14
″ and a plurality of small-diameter gears
15
,
15
′ mounted on the connecting transmission shafts
16
′,
16
″.
Since the aforesaid toy
1
with the gear transmission assembly
13
requires direct engagement between the adjacent gears
14
,
14
′,
14
″,
15
,
15
′, the spatial configuration thereof is limited.
Referring to
FIG. 2
, another conventional toy
2
with a belt transmission assembly
23
is shown to comprise a base building block
21
, two supporting building blocks
22
engaging removably each other and mounted removably on the base building block
21
in a manner similar to the toy
1
of
FIG. 1
, a belt transmission assembly
23
reomvably mounted on the supporting building blocks
22
, and a drive assembly
24
mounted on the base building block
21
. The drive assembly
24
provides power to drive the belt transmission assembly
23
.
The belt transmission assembly
23
includes wheels
232
,
233
,
235
,
237
, connecting transmission shafts
231
,
236
,
241
and belts
234
,
238
. Although the wheels
232
,
233
,
235
,
237
, the connecting transmission shafts
231
,
236
,
241
and the belts
234
,
238
cooperatively provide more diverse configurations as compared to the prior art shown in
FIG. 1
, since the lengths of the belts are specified in accordance with the sizes of the wheels and the distance therebetween, the diversity of the belt transmission assembly
23
is still restricted. Moreover, the belts
234
,
238
used in the belt transmission assembly
23
are generally made of rubber, and are thus susceptible to elastic fatigue after a period of use.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide a length-adjustable transmission chain that is suitable for training on different sizes of sprockets and that is clear of the aforesaid drawbacks of the prior art.
Accordingly, the transmission chain of this invention comprises a plurality of unitary chain links, each of which has parallel first and second side plates, first and second connecting pins, first and second pivot pins, and first and second pivot seats.
The first and second side plates extend in a first direction and are spaced apart from each other in a second direction transverse to the first direction. Each of the first and second side plates has a first end portion and a second end portion opposite to the first end portion in the first direction.
The first connecting pin extends in the second direction and is connected integrally to the first end portions of the first and second side plates. The second connecting pin extends in the second direction and is connected integrally to the second end portions of the first and second side plates.
The first and second pivot pins protrude in opposite directions from the first end portions of the first and second side plates, respectively. The first and second pivot seats are formed integrally and respectively on the second end portions of the first and second side plates.
The first and second pivot pins of one of the chain links are connected pivotally, removably and respectively to the first and second pivot seats of an adjacent one of the chain links.
REFERENCES:
patent: 3628834 (1971-12-01), Anderson
patent: 4882901 (1989-11-01), Lapeyre
patent: 6287229 (2001-09-01), Reber
Abdelwahed Ali
Banks Derris H.
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