Telephonic communications – Supervisory or control line signaling – Signal reception at substation
Reexamination Certificate
2000-05-31
2003-02-18
Chiang, Jack (Department: 2642)
Telephonic communications
Supervisory or control line signaling
Signal reception at substation
Reexamination Certificate
active
06522744
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a volume control apparatus of telephone with improved features.
BACKGROUND OF THE INVENTION
A conventional volume control apparatus of telephone is shown in
FIG. 1
comprising a ringer coil
11
, an assembly
12
consisting of a number of associated members a bent clapper
13
having a head
131
, a post
14
, a base
141
for supporting post
14
, and an auxiliary hook member
15
for holding post
14
.
In operation, clapper
13
is activated by the magnetic force of the electro-magnetically excited ringer coil
11
to hit on gong
16
, while clapper
13
is kept at a predetermined distance from post
14
.
However, such design suffered from a disadvantage of poor positioning of clapper
13
with respect to post
14
as time passes. This problem is partly because the precision of clapper
13
is not always kept at a uniform level in manufacturing. As a result, the volume control functionality is neutralized.
Thus, it is desirable to provide an improved volume control apparatus of telephone in order to overcome the above drawback of prior art.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a volume control apparatus of telephone comprising a base assembly including a central cylindrical member, a threaded bore in the cylindrical member, and a plurality of recesses; a gong assembly including a plastic inner gong with a top hole and a metal outer gong with a top aperture wherein the inner gong is put on the central cylindrical member and the outer gong is threadedly secured to the bore to secure the gong assembly to the base assembly; a drive device threadedly secured to the base assembly including a pair of opposed magnets, a ringer coil, a case for receiving the magnets, a clapper slidably provided in the ringer coil, and a cap member covered on the case; and a volume control assembly threadedly secured on the bottom of the base assembly including a lever having a protrusion and a hole, a bent stopper having a protrusion engaged with the hole of the lever, and an engagement member; wherein the protrusion of the lever is selectively engaged with one of the recesses when the lever is moved to a locked position, resulting in a distance change of the clapper with respect to the engagement member and the gong assembly respectively, thereby generating a plurality of corresponding sound volumes when the clapper reciprocally hits on the gong assembly and the stopper.
The above and other objects, features and advantages of the present invention will become apparent from the following detailed description taken with the accompanying drawings.
REFERENCES:
patent: 4823379 (1989-04-01), Palmer
Chiang Jack
Troxell Law Office PLLC
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