Hook assembly for use in shadow mask frame assembly

Details Hook assembly for use in shadow mask frame assembly Hook assembly for use in shadow mask frame assembly

2000-06-28

2003-06-17

Patel, Ashok (Department: 2879)

Electric lamp and discharge devices

Cathode ray tube

Shadow mask, support or shield

C313S405000, C313S408000, C313S269000

Reexamination Certificate

active

06580204

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a hook assembly for use in a shadow mask frame assembly and in particular to a hook assembly that attaches a shadow mask frame to the face panel of a CRT. The present invention also relates to a shadow mask frame assembly with such a hook assembly.
2. Description of the Related Art
A shadow mask frame assembly for use in flat CRT comprises a pair of support bars
11
,
12
, a pair of tension bars
13
and
14
of which ends are welded to an each end of the support bars
11
and
12
, a shadow mask
20
supported by the support bars
11
and
12
and a plurality of hook assembly
9
attached to the support bars
11
and
12
and/or the tension bars
13
and
14
, as shown in FIG.
1
. Also, as shown in a circle indicated by “A”, there are provided with plurality of slots
22
between strips
21
connected with tie bars
23
.
The shadow mask frame assembly is installed in the face panel of the flat CRT by means of the hook assembly
9
. More specifically, it is installed in the face panel by inserting stud (not-shown) formed on the inner surface of the skirt portion of the face panel into the hole
28
of the hook assembly
9
, comprising base
26
and a spring
27
, welded on the support bars
11
and
12
and the tension bars
13
and
14
of a shadow mask frame, as illustrated in FIG.
1
.
FIG. 2
is an exploded view of the hook assembly
9
further showing welding points. The hook assembly is firmly attached to the support bars
11
and
12
and/or the tension bars
13
and
14
of a mask frame by spot welding at a couple of points
29
, i.e., on the part of the base
26
. Welding must be very strong because the metallic mask frame is rather heavy. The more so recently since flat panel CRTs use relatively heavier frames. The base
26
of the hook assembly
9
welded on the bars is thick and may suffer heat-induced deformation. For instance, while hook assembly is being welded at one spot it may deform so that the next welding point can be off its spot. The deformed hook assembly results in welding weaker than desired and can cause the mask to shift from intended position.
SUMMARY OF THE INVENTION
It is an objective of the present invention to provide a hook assembly that is less deformable subjected to heat such that the hook assembly can be attached by welding to the predetermined location of the mask frame without error.
The objective is achieved by proving a buffer zone in the middle of a base of the hook assembly in a variety of ways so that possible deformation of the hook assembly at one part during welding can prevented from spreading to the rest of the hook. The buffer zone may be tunnel like arch or indention.


REFERENCES:
patent: 3585431 (1971-06-01), Long
patent: 3823336 (1974-07-01), Nakamura et al.
patent: 4455505 (1984-06-01), Ragland, Jr.
patent: 5672935 (1997-09-01), Ito et al.
patent: 5780962 (1998-07-01), Fujii et al.
patent: 5910702 (1999-06-01), Maehara

Affiliated with

Also associated with

Rating

Hook assembly for use in shadow mask frame assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hook assembly for use in shadow mask frame assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hook assembly for use in shadow mask frame assembly will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3132637