Electric lamp and discharge devices – With detachable electrical connector or support
Reexamination Certificate
2002-09-30
2004-08-03
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With detachable electrical connector or support
C313S287000, C313S290000, C313S624000, C313S634000, C313S318010, C403S155000, C403S012000, C403S327000, C362S440000, C248S205100
Reexamination Certificate
active
06771008
ABSTRACT:
TECHNICAL FIELD
This invention relates to lamps and more particularly to mount assemblies for arc discharge lamps. Still more particularly it relates to mount assemblies that are economical to fabricate, suitable for automation, and mounted so as to resist rotation.
BACKGROUND ART
Mount assemblies for arc discharge lamps usually employ a discharge vessel mounted upon a frame. The frame is generally mounted directly to in-leads projecting from a flare. The flare itself comprises a tubular body that can carry the exhaust tubulation and seals the in-leads in a pinch seal. Previous assemblies have employed formed, soft nickel straps that were welded to one leg of a frame, curled manually, welded to a second leg of the frame, placed around the barrel portion of the flare, grasped with pliers and welded together. Further forming conformed the strap to the profile of the flare barrel. Such assemblies are expensive and require a great deal of manual operations to complete. The repetitious hand operations also had unacceptable ergonomic issues. A further assembly that avoided some of these complications is shown in
FIGS. 1-3
. Therein in
FIG. 1
a substantially C-shaped clip
10
is formed from spring steel. The clip
10
has a given height H and an inside diameter D that is smaller than the diameter of the flare with which it is to be employed. The clip
10
has a pair of substantially oppositely located cutouts
12
,
14
, each providing an extending flap
16
,
18
projecting away from the clip. Preferably, the flaps extend away from the clip at an angle of 90°.
The clip is utilized in a mounting assembly
20
for a lamp. The mounting assembly
20
comprises a glass stem or flare
22
that has a first portion
24
that is tubular and has an outside diameter D
2
and a second portion
26
formed as a pinch seal having at least one dimension greater than D
2
.
The substantially C-shaped clip
10
is mounted upon the first portion
24
. The given height H of the clip is less than the height of the tubular portion
24
and the inside diameter D is smaller than the outside diameter D
2
whereby the clip
10
frictionally engages the first portion
24
.
The pair of substantially oppositely located cutouts
12
,
14
formed in the clip
10
engage at least a part of the second portion
26
, i.e., the pinch seal, of the flare, as seen in FIG.
2
.
A first frame member
28
is affixed to the flap
16
and a second frame member
30
is affixed to flap
18
. Affixation can be by any suitable technique, such as welding which is preferred.
The mount comprising the clip and the frame is assembled to the flare by aligning the opening in the clip
10
in the longitudinal direction of the pinch seal, attaching the clip to the barrel of the flare, rotating the clip 90°, and then raising the clip until the cutouts
12
and
14
engage the bottom of the pinch seal, thereby preventing further rotation of the clip.
An alternate embodiment is shown in
FIG. 3
wherein a clip
10
a
has cutouts
12
a
and
14
a
formed separately from the flaps, only one of which,
18
a,
is shown in FIG.
3
.
The remainder of the lamp components, such as the arc tube
32
and a shield
34
can be attached to the frame either before or after the mount assembly is attached to the flare, and then the final connections of the electrical leads can be made.
While this construction provided at great improvement over prior assemblies it occasionally had problems that caused breakage of the mounts. Usually, this breakage occurred because of variations in the thickness of pinch seal. Further, it requires a particular orientation to mount the clip upon the stem and then a second action (raising the clip to engage the pinch seal) in order to complete mounting.
DISCLOSURE OF INVENTION
It is, therefore, an object of the invention to obviate the disadvantages of the prior art.
It is another object of the invention to enhance the assembly of arc discharge lamps.
It is yet another object of the invention to provide a mount assembly that is suitable for automated construction.
It is a further object of the invention to provide a clip that mounts with a single action.
These objects are accomplished, in one aspect of the invention, by the provision of a substantially C-shaped clip formed from spring steel. The clip has an inside diameter D. An upstanding tab is located substantially opposite the open part of the clip and is angled inwardly toward the center of the C-shaped clip. In a preferred embodiment, the end of the upstanding tab is provided with a hooked end.
Additionally, there is provided a mount assembly for a lamp that comprises a glass stem having a first portion that is tubular and has an outside diameter D
2
and including a blow-hole connected to an exhaust tubulation. A substantially C-shaped clip is mounted upon the first portion. The C-shaped clip has an inside diameter D that is smaller than the outside diameter D
2
whereby the clip frictionally engages the first portion. An upstanding tab is located substantially opposite the open part of the clip and is angled inwardly toward the center of said C-shaped clip. A hooked end of the upstanding tab engages the blow-hole, thus fixing the clip rotationally and vertically. A frame member can be affixed to the clip in any of numerous known ways, such as by providing extending flaps as shown in
FIGS. 1-3
. Alternatively, a mount structure that uses only a single frame member could be used and it is not necessary that extending flaps be formed on the clip as other forms for mounting the remaining lamp structure can be employed.
This structure provides a unit that can be assembled by automation techniques, thus providing a more efficient, cost effective structure. Further, the frame-clip unit attaches easily to the glass flare by simply pushing it downward upon the flare, allowing the hooked end of the upstanding tab to engage the blow-hole. This is easily accomplished by making the pinch seal no wider than the tubular portion. Additionally, ergonomic issues associated with the prior technique are reduced.
REFERENCES:
patent: 3224720 (1965-12-01), Hain
patent: 3548235 (1970-12-01), Driedijk et al.
patent: 5212422 (1993-05-01), Topel et al.
patent: 5521458 (1996-05-01), Kulik, Jr.
patent: 6188164 (2001-02-01), Brown et al.
patent: 6575415 (2003-06-01), Williamson
Colón German
Meyer William E.
Osram Sylvania Inc.
Patel Nimeshkumar D.
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