Coolant buffering apparatus for CRT assembly

Details Coolant buffering apparatus for CRT assembly Coolant buffering apparatus for CRT assembly

1998-10-30

2001-02-13

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

With temperature modifier

For envelope wall

C313S035000, C313S046000, C348S749000

Reexamination Certificate

active

06188165

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coolant buffering apparatus of a CRT (cathode ray tube) assembly and, more particularly, to a coolant buffering apparatus of a CRT assembly having an improved structure to buffer an expanding and contracting coolant.
2. Description of the Related Art
In general, in a CRT assembly, such as a projection TV, the fluorescent surface of the CRT may be damaged due to heat generated by the CRT. Accordingly, a cooling device is employed in the CRT assembly which uses a coolant such as ethylene glycol or glycerin. Also, to buffer expansion and contraction of the coolant, a coolant buffer must be provided with the cooling device.
FIGS. 1 and 2
show a conventional CRT assembly having a coolant buffering apparatus. Referring to the drawings, a CRT assembly has a coupler
40
for cooling a CRT
10
installed between the CRT
10
and a projection lens unit
20
. The coupler
40
contains a coolant
30
and a plurality of radiating fins
41
are formed on the outer surface of the coupler
40
. Rubber rings
14
and
24
forming a seal between the CRT
10
, the coupler
40
and the projection lens unit
20
are disposed between the CRT
10
and the coupler
40
, and the coupler
40
and the projection lens unit
20
, respectively. The coolant
30
is injected via an inlet (not shown) formed by piercing the coupler
40
and then held in a containing portion
42
. The inlet is sealed by an additional sealing means (not shown).
In the conventional CRT assembly, a coolant buffering apparatus
50
is installed in a buffer path
43
which is connected to the coupler
40
in order to buffer the coolant
30
which repeatedly expands and contracts according to changes in the temperature of the CRT
10
. The coolant buffering apparatus
50
includes a rubber bellows
51
of a hemispheric shape inserted in the buffer path
43
and a protective cap
52
, installed on the rubber bellows
51
, for protecting the rubber bellows
51
from being damaged when the coolant
30
expands.
The coolant buffering apparatus
50
and the projection lens unit
20
can be sealed between them and coupled to the coupler
40
by a sealing bracket
60
.
In the conventional coolant buffering apparatus having the above structure, however, as the coolant
30
repeatedly expands and contracts, the rubber bellows
51
can easily tear.
SUMMARY OF THE INVENTION
To solve the above problem, it is an objective of the present invention to provide a coolant buffering apparatus of a CRT assembly having an improved structure to buffer a coolant during repeated expansions and contractions.
Accordingly, to achieve the above objective, there is provided a coolant buffering apparatus of a CRT for buffering expansions and contractions of a coolant held in a coupler installed between the CRT and a projection lens unit, which comprises a cylinder connected to the coupler to accept coolant flowing from the coupler, a piston assembly installed within the cylinder and operative to reciprocate in the cylinder and being pushed in a direction away from the coupler in the cylinder as the coolant expands, and a spring for elastically biasing the piston assembly toward the coupler as the coolant contracts.
Preferably, the coolant buffering apparatus of a CRT further comprises a cylinder cover coupled to the end of the cylinder opposite the coupler and a rubber ring disposed between the coupler and the cylinder to seal the coupler and the cylinder.
Further, it is preferable that the piston assembly comprises a piston head coupled to the piston ring, a rod having one end thereof coupled to the piston head and reciprocating in the cylinder, and a cap inserted around and fixed to the other end of the rod.
Also, it is preferable that the coolant buffering apparatus of a CRT further comprises at least one piston ring provided at the outer circumferential surface of the piston head which contacts the inner circumferential surface of the cylinder to prevent the coolant from leaking.


REFERENCES:
patent: 4035230 (1977-07-01), Bevilacqua
patent: 4777532 (1988-10-01), Hasegawa
patent: 4982289 (1991-01-01), Mitani et al.
patent: 4-101335 (1992-04-01), None
patent: 4-171637 (1992-04-01), None

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