Measuring and testing – Speed – velocity – or acceleration – Structural installation or mounting means
Reexamination Certificate
1999-12-06
2002-07-09
Kwok, Helen (Department: 2856)
Measuring and testing
Speed, velocity, or acceleration
Structural installation or mounting means
C073S431000, C324S171000
Reexamination Certificate
active
06415662
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a shell structure, and more particularly to a shell structure for a signal sensing and transmitting device.
BACKGROUND OF THE INVENTION
The bicycle is considered as a transporting device as well as an entertainment tool in leisure time. A wireless speedometer for a bicycle is developed and becomes popular. Such a speedometer can provide information including the speed of the bicycle, the distance that the bicycle has moved, etc. Referring to
FIG. 1
, a wireless speedometer
1
is mounted on a bicycle
10
. The wireless speedometer
1
includes a magnet
11
, a signal sensing and transmitting device
13
, and a calculating and indicating device
15
. The magnet
11
is mounted on a spoke
12
of the bicycle
10
. The signal sensing and transmitting device
13
is mounted on the folk
16
of the bicycle
10
. The signal sensing and transmitting device
13
includes a reed switch (not shown). The position of the signal sensing and transmitting device
13
is corresponding to that of the magnet
11
so that the magnet
11
can pass through the signal sensing and transmitting device
13
while the bicycle
10
is moving. When the magnet
11
passes through the signal sensing and transmitting device
13
, an on/off signal will be generated by the reed switch. A control signal is then generated and transmitted by the signal sensing and transmitting device
13
to the calculating and indicating device
15
mounted on the handlebar
14
. The calculating and indicating device
15
includes a microprocessor and a liquid crystal display (not shown). According to the number and the frequency of the received control signals and the diameter of the front wheel
17
of the bicycle
10
, the speed and the moving distance of the bicycle
10
can be calculated by the microprocessor and indicated on the liquid crystal display.
FIGS.
2
(
a
) and
2
(
b
) respectively illustrate two kinds of conventional signal sensing and transmitting devices. In FIG.
2
(
a
), the conventional signal sensing and transmitting device includes the main body of the signal sensing and transmitting circuit
21
, and the battery
22
. The main body of the signal sensing and transmitting circuit is received within the shell body
231
. The shell cover
232
is mounted to the shell body after the main body of the signal sensing and transmitting circuit
21
has been put into the shell body
231
. The shell cover
232
is fastened on the shell body by the screws
24
. A water-resistant ring
235
is mounted between the shell cover
232
and the shell body
231
to keep the circuit away from moisture. The shell cover
232
includes a battery hole
233
for receiving therein the battery
22
. The battery
22
is fastened by the battery cover
234
. To keep the battery
22
away from moisture, a water-resistant ring
236
is mounted between the battery cover
234
and the shell cover
232
.
In FIG.
2
(
b
), the conventional signal sensing and transmitting device include the main body of the signal sensing and transmitting circuit
71
and the battery
72
. The assembly of the shell body
731
, the main body of the signal sensing and transmitting circuit
71
, the shell cover
732
including the battery hole
733
, the battery
72
, the water-resistant ring
736
, and the battery cover
734
are similar to that of the elements shown in FIG.
2
(
a
) except the combination of the shell body
731
and the shell cover
732
. They are integrated by an ultrasonic jointing method instead of screwing. Accordingly, the water-resistant ring between the shell body and the shell cover is saved. Furthermore, since the ultrasonic combination method consumes less time that of the screwing process, the assembling efficiency is increased. However, the main body of the signal sensing and transmitting circuit
71
, especially the antenna, may be damaged by the vibration generated during the ultrasonic jointing process. As a result, the yield is reduced. Furthermore, the main body of the signal sensing and transmitting circuit
71
and the battery
72
must be respectively covered and fastened by the shell cover
732
and the battery
734
. The assembling process is still troublesome.
It is then attempted by the Applicant to solve the above-mentioned problems.
SUMMARY OF THE INVENTION
An object of the present invention is to provide an easily-assembled shell structure for a signal sensing and transmitting device of a speedometer of a bicycle.
Another object of the present invention is to increase the yield and reduce the cost of manufacturing a shell structure for a signal sensing and transmitting device of a speedometer of a bicycle.
According to the present invention, a shell structure of a signal sensing and transmitting device adapted to be used with a wireless speedometer for a bicycle is provided. A main body of a signal sensing and transmitting circuit and a battery is received within the shell structure. The shell structure includes a shell body. The shell body includes an opening for being inserted therethrough the main body of the signal sensing and transmitting circuit and the battery. The shell body also includes a receiving space for receiving therein the main body of the signal sensing and transmitting circuit and the battery. The shell structure further includes a fastening lip for covering the opening of the shell body and fastening the main body of the signal sensing and transmitting circuit and the battery within the shell body.
The shell body is preferably pillared and hollow for forming therein the receiving space. Preferably, the opening is formed on a top portion of the shell body. More particularly, the fastening lip may be circular while the shell body is cylindrical. In such a situation, both the shell body and the fastening lip may be threaded for screwing the fastening lip on the shell body.
According to another aspect of the present invention, a flexible fixer is preferably formed on the shell body, and a recess corresponding to the flexible fixer is formed on the fastening lip for receiving therein the flexible fixer.
According to still another aspect of the present invention, the shell body and the fastening lip may be jointed by a bolt.
Preferably, a water-resistant ring is mounted between the fastening lip and the shell body for keeping the receiving space from moisture. Such a water-resistant ring can be made of rubber or silica gel.
Preferably, both the fastening lip and the shell body include threaded portions respectively so that the fastening lip can be screwed on the shell body. In such a situation, the water-resistant ring is mounted between the threaded portions.
According to another aspect of the present invention, the water-resistant ring can also be mounted around the rim of the opening or at the junction of the shell body and the fastening lip.
The main body of the signal receiving and transmitting circuit preferably includes a transmitting antenna, a print circuit board (PCB), and a PCB holder for holding the PCB.
A battery supporter is preferably mounted on the PCB holder for supporting the battery.
Preferably, the shell body further includes a fixing ring for fixing the signal sensing and transmitting device on a bicycle.
The shell body is preferably formed integrally.
The present invention may best be understood through the following description with reference to the accompanying drawings, in which:
REFERENCES:
patent: 4334190 (1982-06-01), Sochaczevski
patent: 5481901 (1996-01-01), Huang
patent: 446689 (1986-07-01), None
Klein & Szekeres LLP
Kwok Helen
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