CA1074843A - Filament shield for sealed headlamp and mounting method therefor - Google Patents
Filament shield for sealed headlamp and mounting method thereforInfo
- Publication number
- CA1074843A CA1074843A CA275,249A CA275249A CA1074843A CA 1074843 A CA1074843 A CA 1074843A CA 275249 A CA275249 A CA 275249A CA 1074843 A CA1074843 A CA 1074843A
- Authority
- CA
- Canada
- Prior art keywords
- filament
- shield
- lateral projection
- welded
- flange
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000000034 method Methods 0.000 title claims description 6
- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 238000005286 illumination Methods 0.000 description 7
- 230000000903 blocking effect Effects 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 1
- WQGWDDDVZFFDIG-UHFFFAOYSA-N pyrogallol Chemical compound OC1=CC=CC(O)=C1O WQGWDDDVZFFDIG-UHFFFAOYSA-N 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/26—Screens; Filters
Landscapes
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Securing Globes, Refractors, Reflectors Or The Like (AREA)
- Body Structure For Vehicles (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The two legs of a headlamp filament are welded to a headlamp filament shield to form a subassembly intermediate in the manufacturing process. The rigid nature of the filament/
shield subassembly thereupon allows handling during assembly without displacing the filament from its precise location with respect to the shield as required by modern automotive head-lamps. The filament/sheild subassembly is welded to support pins in its final location in the lamp. A portion of the filament shield, orginally providing an electrical short circuit across the filament is trimmed away after welding to the support pins to make the lamp operational.
The two legs of a headlamp filament are welded to a headlamp filament shield to form a subassembly intermediate in the manufacturing process. The rigid nature of the filament/
shield subassembly thereupon allows handling during assembly without displacing the filament from its precise location with respect to the shield as required by modern automotive head-lamps. The filament/sheild subassembly is welded to support pins in its final location in the lamp. A portion of the filament shield, orginally providing an electrical short circuit across the filament is trimmed away after welding to the support pins to make the lamp operational.
Description
:
..... , . . . . . . . , . . . ~ . - . ` , R~CK~ROUND OF I~E INVE~TIO~
Node~n automot~ive headlamps ~equire precise positioning:
-~ ; o the filamen~ with respect to ~he~ reflPctor. ~In additi~n, they require precise positioning o~ a Eilament shield o~ward,~
:aft~and~to the sides of the filament to prevent the forwards;~
aft and~side~ays pro3ection:o~ light rays~directll~ from ~he~
ilament. ~In-particular, the~:embodiment described:prev~nt the uti~ization of light~rays from approximately the lower half;af the:fil~ment.
: : : : : , ~ :
7~43 The prior art fails to teach a method of mounting :.
both filament and filament shield in a precise manner .
while requiring only normal handling of the parts during assembly.
SUMMARY O~ THE INVENTION
The instant invention teaches a headlamp filament and shield, and the method of assembling same which enables ~;
precise positioning of both filament and shield within the reflector of the headlamp envelope. :
The filament and its shield are first welded together into a rigid subassembly. The filament/shield subassembly is welded as a unit to support and power-source pins within `~
the headlamp. A portion of the filament shield, previously : .
producing an electrical short circuit across the filament .:.
is cut away after the subassembly is securely aligned and . .:
welded in place. . .
: ~riefly described the present invention teaches a ~ .
method of assembling the filament and metallic shield in .~ -.
an automotive type headlamp comprising preassembling the-filament and filament shield into a rigid subassembly ~ith . :
the filament being welded at each of its two mounting legs .. ..
to the filament shield whereby an electrical short circuit : is formed through the metallic filament shield between the ends of the filamentt then welding the subassembly to support ~pins in a reflector of a headlamp~ then support pins also : :being adapted to providing electrical connection to the i ~
filament, and then cutting away the connecting metal between the locatlon on the filament shield where one end of thq :
filament iswelded and the remainder of the filament shield ~-:
:; 30 ~wher.ebythe electrical short circuit of the filament previously :: . . .
. ~ - 2 -sam/:.~
4~343 existing through the body of the filament shield is removed.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a schematic view of a headlamp containing the filament shield and lamp filament of the present invention.
Fig. 2 shows the required illumination and blocking of the headlamp reflector.
Fig. 3 shows a top view of the headlamp shield.
Fig. 4 shows the lamp filament.
Fig. 5 shows the filament shield and filament in a unitary subassembly.
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~L~7~843 Fig. 6 shows a ~ross-sectional view of the ~ilament shield and filament taken along 6-6 oE Fig. 5.
Fig. 7 shows the shield/~ilament subassembly mounted in a headlamp reflector.
Fig. 8 shows ~he ilamen~ and shield installed and trimmed in its final assembled condition.
~ ETAIlED DE:SCRIPTIO~ OF_THE PREEERRED E:M~ODIMENT
. Fig. 1 sho~s the arrangement o the low-beam lamp filament in a European-type headlamp shown generaLly at 10.
A cy~indrical ~piral lamp filament 12 is located with the ,. .. . . . .
axis o~ the cyl~.ndricaL lamp filament ~2 approximately on , the axis o the paraboloid lamp re1ector 14. The specifi-cations or such lamps require that the low-beam filame~
'12 be prevented from illuminating certain~portions:of ~he læ~p re~lector 14. In addition, the specifications requir~
. that axial and n~ar axial forward xadiation directly rom .
the ~lament 12 be blocked. This control of directional ~ _ :
illumLnation is~ accompli9hed asing a shield 15 whicb pa~tLal b : enclo~és the ~Llament 12 20 ~ ; A~ aft shield 16, interposed betw~en the ilament 1 ~nd the re1ector 14 blocks di~ect xearward illumination o :~
the reflector 14~by the filam~nt 12~ The shape of this blockag~ will~ be described~;~in later paragraphs. A forward :shield lS,`~larger than the aft shield~ is located forward . .: , . - : : ~
: o$ ~the ~ilamen~ 12. The orward shield 18 blocks forward : radiation directly ~rom the filament 12~ h lower shield 20 ~ ~ :
bio~ks illumination o the bottom and side5 of the ~e1ector - 3 - :
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.
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in a predetermined pattern. The remaining illumination Erom the ~ilament 12, a~ter xe1ec~ion from the reflector 14, is direc~ed below the axis of the lamp reflector 14 as required by the speci~ications of this type of lamp 10.
Fig. 2 shows ~he desired illumination pattern of the reflector 14. The stippled portion 22 describes ~he area required to be blocked ~rom illumination by the filament.
- . .
The plain portion 24 describes the illuminated area~ In addi-.
tio~ to blockage o~ the lower 165 degrees of the ~e~lector - 1~ 14, the ~locked portion 22 also includes a semicircular central blocked portion 26 concèntric wit~ the paraboloid .
axis.
A t~p view ~of the shield 15 is shown in Fig. 3. The - : forv~ard d~rection is do~nward in Fig. 3. ~he shield 15 :-contains a concavity 28 within which the ~ilæment 12 is ~- ~uspended. An approximately rectangular mounting plate 30 extend~ outw~rd, toward the right in the drawing, rom the .- . , . - : .
concavity 28. Two stiffening corru~ations 32, 32a in ~he mounting.plate 30 extend outward ~rom the concavity 28 to -, ' `:
~, 20 ~ ~ ~ mou~ting flange 34. .
A flat flange 3~ is comlected to the le~t side o~ the shield 15 in the~drawing. A depression 38 is pruvided near the forward end o~ the flat ~lange 36, to provide clear~nce fdr one of the filament 12 legs as will be described later.
: A bump 40 is positioned in the rear of the flat flange 36 to provide an electrical and mechanical connection point for ~he filamen~ 12.
, .:
.
A forward shield 42 prevents the forward projection of light from the filament 12.
A J-shaped projection 44 projects fxom adjacent the forward end of the flat flange 36. The J-shaped projection 44 has a long leg 46, a short leg 48, and a base 50.
The filament 12 is shown in Fig. 4. The filament 12 is of the type known as a Sleeper-Hartley filament. The Sleeper-Hartley filament consists of a cylindrical coil of filament wire 52 ana two parallel legs 54,56. The ~ilament legs 54,56 in this embodiment of the present invention are ;~
of unequal length. The long filament leg 54 is longer than the short filament leg 56. The cylindrical coil of filament wire 52 contains an integral number of turns plus 1/2 turn.
Thus the two legs 54, 56 emerge from the coil 52 parallel to each other o~ the same side of the axis of the coil 52 but separated by the diameter of the coil. As shown in the figure, the long filament leg 54 projects toward the left from the bottom of the coil 52 whereas the short filament leg 56 pro-jects toward the left from the top of the coil 52.
Fig. 5 shows a preassembled su~assembly in which the filament 12 is preassembled into the filament shield 15.
The long filament leg 54 passes through the depression 38 without making mechanical or electrical contact at this point and makes contact with the short leg 48 of the J-shaped projection 44. The long filament leg 54 ls welded to the short leg 48 of the J-shaped projection 44 at their ,~ :
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~7D~8~k3 point of contact 58. The short filament leg 56 passes over the flat 1ange 36 and makes contactlwith the bump 40. The short ~ilament leg 56 and the bump 40 are welded at their point of contact 60.
When preassembled in the fashion described in preceding paragraphs, the filament shield 15 and filament 12 form a rugged subassembly adap~ed tu handlln~ in further manu-ac uring processes without losing the required spatLal : relationships between them. ~ote that at ~his stage o : preassembly, the filament shLeld provide9 a dead electrical short across. the legs 54, 56 of the ~ilamen~ 12.
,, , ~ . .
~ he cross-sectio~al vlew in F~g. 6 ~ake~ along ~ine 6-6 in Fig. 5 illustrate9 the relative posLtioning of the.elements ~ ~ of the s~bassembly. Mounting flange 34 at the outer end of : the mounting plate 30 i8 seen to contain an S-shaped curve~
containing an in~er concave angle 62 and ~n outer concave ~ angle 6-4. The outer concave angle 64 ls used for precise ~
:` pos~tionin~ of ~he ~ubassem~ly within the headlamp ref~ector -. . ,. : ~
as w~ll be described later~ The stiffening corrugatio~ 32a . . . ~ . .
20:~ ; and 32 (beh~nd 32a) contribute rigidity;to t~e mount~ng plate ~:
30 in order that the assembly may resist tion under normal road use. :~ ~
The long fLlament leg 54 Ls shown, at the end of the fLlament 12 nearest the viewer, passin~ through the depres- : :
sLon 38 and making contact with t~e short leg of the ~ 48. ~ :~
`::; The lon~ leg of the J 46 is b~nt at the point it joLns the : fia~ fl~nge 36 in order to translate the short :Leg o the .
~74~343 J 46 to the level required to make collinear contact with the emerging long ~ilament leg 54.
The short ilament leg 56, at the end o:E the f ilament 12 farthes~ from the viewer, makes contact with the bump ~0 The aft shield 16 is shown to contain an upper semi-circular part 66 and a lower part 68. This shape o the shield 16 provide~ the correct blocking pattern to provide .
the speciied pat~ern ~ r6flector illumination as previously shown ~n Fig. 2. :
~ The insta11ation o~ the subassembly in the head1amp begins wlth the ærangement shown in FigD 7. A ~ir9t mount~ng pin 70, passirlg sealably through the Iamp re:Elector 14, ~ -pxovides both mechanlcal support and electrical supply ~o ~ ;
. . . i .
the subassembly. A second mounting pin 72 ~rovides aII :
: ~ ~ initial alig~nt bearing and subsequent elec~rical supply ;~
to the subassembly. The outer concave angle 64, ~unning ~he ~ :
entire le~gth-of the mounting 1~nge 34 ls itted against ~ :
the ~irs~ mounting pin 70. The shield I5 is rotated abou~
i~s~bearing line on the fir~t mounting pin 70 unt~l ~he base 20~ ~ o t~e J 50 comes to bear against the second mounting pin 72. ~:
W~en positioned in this way, the fi1a~ent/shîe1d subassembly is inlprecise~alignment between ics own eLements and relative to ~he lamp reflector 14.~; ~The mounting flange 34 and first ; :~
mounting pin 70 are welded~together along their line o contact:.: The base o the J 5Q and the second mounting pin 72 :~ :
are we1ded together at their contact . The ~ Qng leg of the J :4~ is thereupon cut away to remove the~ electric.al sh~rt _ :, ~ ~ . :
: ~ ~ . . . . .
~ 7 ~ ~ ~3 circui~ previously existing across the fil.ament 12. Fig. 8 shows the resulting configura~.io~. Mechanical support and one electrical connection to the filament 12 is provided through the first mount;ng pin 70, the body of ~he -Eilament shield 15, and tha bump 40 to the short filament ~.eg 56.
The strength and rigidity of the first m~unting pin 70 is sufficie~t by itself to support the filament shield lS and :Eilament 12 against mechanical movement. The 6econd mounting pin 72 merely provides the second electrical connectioI~ ~o . the :Eilament 12 through the remaining portions of the J-shaped pro~ection 44 and the long filament leg 54. The 6econd mou~ting .pin 72 also provides mechanical support for on- end o ~the :filàme~t 12. ~ : :
''- ' :' ' : ' , .
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.. . . ..
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:~: - -.
' .
' ,
..... , . . . . . . . , . . . ~ . - . ` , R~CK~ROUND OF I~E INVE~TIO~
Node~n automot~ive headlamps ~equire precise positioning:
-~ ; o the filamen~ with respect to ~he~ reflPctor. ~In additi~n, they require precise positioning o~ a Eilament shield o~ward,~
:aft~and~to the sides of the filament to prevent the forwards;~
aft and~side~ays pro3ection:o~ light rays~directll~ from ~he~
ilament. ~In-particular, the~:embodiment described:prev~nt the uti~ization of light~rays from approximately the lower half;af the:fil~ment.
: : : : : , ~ :
7~43 The prior art fails to teach a method of mounting :.
both filament and filament shield in a precise manner .
while requiring only normal handling of the parts during assembly.
SUMMARY O~ THE INVENTION
The instant invention teaches a headlamp filament and shield, and the method of assembling same which enables ~;
precise positioning of both filament and shield within the reflector of the headlamp envelope. :
The filament and its shield are first welded together into a rigid subassembly. The filament/shield subassembly is welded as a unit to support and power-source pins within `~
the headlamp. A portion of the filament shield, previously : .
producing an electrical short circuit across the filament .:.
is cut away after the subassembly is securely aligned and . .:
welded in place. . .
: ~riefly described the present invention teaches a ~ .
method of assembling the filament and metallic shield in .~ -.
an automotive type headlamp comprising preassembling the-filament and filament shield into a rigid subassembly ~ith . :
the filament being welded at each of its two mounting legs .. ..
to the filament shield whereby an electrical short circuit : is formed through the metallic filament shield between the ends of the filamentt then welding the subassembly to support ~pins in a reflector of a headlamp~ then support pins also : :being adapted to providing electrical connection to the i ~
filament, and then cutting away the connecting metal between the locatlon on the filament shield where one end of thq :
filament iswelded and the remainder of the filament shield ~-:
:; 30 ~wher.ebythe electrical short circuit of the filament previously :: . . .
. ~ - 2 -sam/:.~
4~343 existing through the body of the filament shield is removed.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 shows a schematic view of a headlamp containing the filament shield and lamp filament of the present invention.
Fig. 2 shows the required illumination and blocking of the headlamp reflector.
Fig. 3 shows a top view of the headlamp shield.
Fig. 4 shows the lamp filament.
Fig. 5 shows the filament shield and filament in a unitary subassembly.
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~L~7~843 Fig. 6 shows a ~ross-sectional view of the ~ilament shield and filament taken along 6-6 oE Fig. 5.
Fig. 7 shows the shield/~ilament subassembly mounted in a headlamp reflector.
Fig. 8 shows ~he ilamen~ and shield installed and trimmed in its final assembled condition.
~ ETAIlED DE:SCRIPTIO~ OF_THE PREEERRED E:M~ODIMENT
. Fig. 1 sho~s the arrangement o the low-beam lamp filament in a European-type headlamp shown generaLly at 10.
A cy~indrical ~piral lamp filament 12 is located with the ,. .. . . . .
axis o~ the cyl~.ndricaL lamp filament ~2 approximately on , the axis o the paraboloid lamp re1ector 14. The specifi-cations or such lamps require that the low-beam filame~
'12 be prevented from illuminating certain~portions:of ~he læ~p re~lector 14. In addition, the specifications requir~
. that axial and n~ar axial forward xadiation directly rom .
the ~lament 12 be blocked. This control of directional ~ _ :
illumLnation is~ accompli9hed asing a shield 15 whicb pa~tLal b : enclo~és the ~Llament 12 20 ~ ; A~ aft shield 16, interposed betw~en the ilament 1 ~nd the re1ector 14 blocks di~ect xearward illumination o :~
the reflector 14~by the filam~nt 12~ The shape of this blockag~ will~ be described~;~in later paragraphs. A forward :shield lS,`~larger than the aft shield~ is located forward . .: , . - : : ~
: o$ ~the ~ilamen~ 12. The orward shield 18 blocks forward : radiation directly ~rom the filament 12~ h lower shield 20 ~ ~ :
bio~ks illumination o the bottom and side5 of the ~e1ector - 3 - :
: ' ~
.
8~
in a predetermined pattern. The remaining illumination Erom the ~ilament 12, a~ter xe1ec~ion from the reflector 14, is direc~ed below the axis of the lamp reflector 14 as required by the speci~ications of this type of lamp 10.
Fig. 2 shows ~he desired illumination pattern of the reflector 14. The stippled portion 22 describes ~he area required to be blocked ~rom illumination by the filament.
- . .
The plain portion 24 describes the illuminated area~ In addi-.
tio~ to blockage o~ the lower 165 degrees of the ~e~lector - 1~ 14, the ~locked portion 22 also includes a semicircular central blocked portion 26 concèntric wit~ the paraboloid .
axis.
A t~p view ~of the shield 15 is shown in Fig. 3. The - : forv~ard d~rection is do~nward in Fig. 3. ~he shield 15 :-contains a concavity 28 within which the ~ilæment 12 is ~- ~uspended. An approximately rectangular mounting plate 30 extend~ outw~rd, toward the right in the drawing, rom the .- . , . - : .
concavity 28. Two stiffening corru~ations 32, 32a in ~he mounting.plate 30 extend outward ~rom the concavity 28 to -, ' `:
~, 20 ~ ~ ~ mou~ting flange 34. .
A flat flange 3~ is comlected to the le~t side o~ the shield 15 in the~drawing. A depression 38 is pruvided near the forward end o~ the flat ~lange 36, to provide clear~nce fdr one of the filament 12 legs as will be described later.
: A bump 40 is positioned in the rear of the flat flange 36 to provide an electrical and mechanical connection point for ~he filamen~ 12.
, .:
.
A forward shield 42 prevents the forward projection of light from the filament 12.
A J-shaped projection 44 projects fxom adjacent the forward end of the flat flange 36. The J-shaped projection 44 has a long leg 46, a short leg 48, and a base 50.
The filament 12 is shown in Fig. 4. The filament 12 is of the type known as a Sleeper-Hartley filament. The Sleeper-Hartley filament consists of a cylindrical coil of filament wire 52 ana two parallel legs 54,56. The ~ilament legs 54,56 in this embodiment of the present invention are ;~
of unequal length. The long filament leg 54 is longer than the short filament leg 56. The cylindrical coil of filament wire 52 contains an integral number of turns plus 1/2 turn.
Thus the two legs 54, 56 emerge from the coil 52 parallel to each other o~ the same side of the axis of the coil 52 but separated by the diameter of the coil. As shown in the figure, the long filament leg 54 projects toward the left from the bottom of the coil 52 whereas the short filament leg 56 pro-jects toward the left from the top of the coil 52.
Fig. 5 shows a preassembled su~assembly in which the filament 12 is preassembled into the filament shield 15.
The long filament leg 54 passes through the depression 38 without making mechanical or electrical contact at this point and makes contact with the short leg 48 of the J-shaped projection 44. The long filament leg 54 ls welded to the short leg 48 of the J-shaped projection 44 at their ,~ :
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~7D~8~k3 point of contact 58. The short filament leg 56 passes over the flat 1ange 36 and makes contactlwith the bump 40. The short ~ilament leg 56 and the bump 40 are welded at their point of contact 60.
When preassembled in the fashion described in preceding paragraphs, the filament shield 15 and filament 12 form a rugged subassembly adap~ed tu handlln~ in further manu-ac uring processes without losing the required spatLal : relationships between them. ~ote that at ~his stage o : preassembly, the filament shLeld provide9 a dead electrical short across. the legs 54, 56 of the ~ilamen~ 12.
,, , ~ . .
~ he cross-sectio~al vlew in F~g. 6 ~ake~ along ~ine 6-6 in Fig. 5 illustrate9 the relative posLtioning of the.elements ~ ~ of the s~bassembly. Mounting flange 34 at the outer end of : the mounting plate 30 i8 seen to contain an S-shaped curve~
containing an in~er concave angle 62 and ~n outer concave ~ angle 6-4. The outer concave angle 64 ls used for precise ~
:` pos~tionin~ of ~he ~ubassem~ly within the headlamp ref~ector -. . ,. : ~
as w~ll be described later~ The stiffening corrugatio~ 32a . . . ~ . .
20:~ ; and 32 (beh~nd 32a) contribute rigidity;to t~e mount~ng plate ~:
30 in order that the assembly may resist tion under normal road use. :~ ~
The long fLlament leg 54 Ls shown, at the end of the fLlament 12 nearest the viewer, passin~ through the depres- : :
sLon 38 and making contact with t~e short leg of the ~ 48. ~ :~
`::; The lon~ leg of the J 46 is b~nt at the point it joLns the : fia~ fl~nge 36 in order to translate the short :Leg o the .
~74~343 J 46 to the level required to make collinear contact with the emerging long ~ilament leg 54.
The short ilament leg 56, at the end o:E the f ilament 12 farthes~ from the viewer, makes contact with the bump ~0 The aft shield 16 is shown to contain an upper semi-circular part 66 and a lower part 68. This shape o the shield 16 provide~ the correct blocking pattern to provide .
the speciied pat~ern ~ r6flector illumination as previously shown ~n Fig. 2. :
~ The insta11ation o~ the subassembly in the head1amp begins wlth the ærangement shown in FigD 7. A ~ir9t mount~ng pin 70, passirlg sealably through the Iamp re:Elector 14, ~ -pxovides both mechanlcal support and electrical supply ~o ~ ;
. . . i .
the subassembly. A second mounting pin 72 ~rovides aII :
: ~ ~ initial alig~nt bearing and subsequent elec~rical supply ;~
to the subassembly. The outer concave angle 64, ~unning ~he ~ :
entire le~gth-of the mounting 1~nge 34 ls itted against ~ :
the ~irs~ mounting pin 70. The shield I5 is rotated abou~
i~s~bearing line on the fir~t mounting pin 70 unt~l ~he base 20~ ~ o t~e J 50 comes to bear against the second mounting pin 72. ~:
W~en positioned in this way, the fi1a~ent/shîe1d subassembly is inlprecise~alignment between ics own eLements and relative to ~he lamp reflector 14.~; ~The mounting flange 34 and first ; :~
mounting pin 70 are welded~together along their line o contact:.: The base o the J 5Q and the second mounting pin 72 :~ :
are we1ded together at their contact . The ~ Qng leg of the J :4~ is thereupon cut away to remove the~ electric.al sh~rt _ :, ~ ~ . :
: ~ ~ . . . . .
~ 7 ~ ~ ~3 circui~ previously existing across the fil.ament 12. Fig. 8 shows the resulting configura~.io~. Mechanical support and one electrical connection to the filament 12 is provided through the first mount;ng pin 70, the body of ~he -Eilament shield 15, and tha bump 40 to the short filament ~.eg 56.
The strength and rigidity of the first m~unting pin 70 is sufficie~t by itself to support the filament shield lS and :Eilament 12 against mechanical movement. The 6econd mounting pin 72 merely provides the second electrical connectioI~ ~o . the :Eilament 12 through the remaining portions of the J-shaped pro~ection 44 and the long filament leg 54. The 6econd mou~ting .pin 72 also provides mechanical support for on- end o ~the :filàme~t 12. ~ : :
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Claims (5)
1. A method of assembling the filament and metallic fila-ment shield in a automotive type headlamp comprising:
(a) preassembling said filament and filament shield into a rigid subassembly, said filament being welded at each of its two mounting legs to said filament shield whereby an electrical short circuit is formed through said metallic filament shield between the ends of said filament, then (b) welding said subassembly to support pins in a reflector of said headlamp, said support pins also being adapted to pro-viding electrical connection to said filament; and then (c) cutting away the connection metal between i) a portion of said filament shield to which one of said support pins and one end of said filament are welded and ii) the remainder of said filament shield, whereby the electrical short circuit of said filament previously existing through the body of said filament shield is removed.
(a) preassembling said filament and filament shield into a rigid subassembly, said filament being welded at each of its two mounting legs to said filament shield whereby an electrical short circuit is formed through said metallic filament shield between the ends of said filament, then (b) welding said subassembly to support pins in a reflector of said headlamp, said support pins also being adapted to pro-viding electrical connection to said filament; and then (c) cutting away the connection metal between i) a portion of said filament shield to which one of said support pins and one end of said filament are welded and ii) the remainder of said filament shield, whereby the electrical short circuit of said filament previously existing through the body of said filament shield is removed.
2. An automotive headlamp comprising:
(a) reflector;
(b) first and second support pins sealably piercing said reflector;
(c) a metallic filament shield;
(d) a lateral projection from said filament shield;
(e) a lamp filament initially welded at its first end to said filament shield and welded at its second end to said lateral projection from said filament shield;
(f) a mounting flange on said filament shield adapted to engagement with said first support pin;
(g) means for weldably bonding said mounting flange to said first support pin;
(h) said lateral projection on said filament shield being adapted to engagement with said second support pin;
(i) means for weldably bonding said lateral projection to said second support pin; and (j) a narrow region on said lateral projection adapted to being cut away to sever the mechanical and electrical connec-tion between the portion of said projection containing the connection with said second end of said filament and said second support pin and the remainder of said filament shield, whereby the electrical short circuit previously provided between the ends of said filament through said filament shield is removed.
(a) reflector;
(b) first and second support pins sealably piercing said reflector;
(c) a metallic filament shield;
(d) a lateral projection from said filament shield;
(e) a lamp filament initially welded at its first end to said filament shield and welded at its second end to said lateral projection from said filament shield;
(f) a mounting flange on said filament shield adapted to engagement with said first support pin;
(g) means for weldably bonding said mounting flange to said first support pin;
(h) said lateral projection on said filament shield being adapted to engagement with said second support pin;
(i) means for weldably bonding said lateral projection to said second support pin; and (j) a narrow region on said lateral projection adapted to being cut away to sever the mechanical and electrical connec-tion between the portion of said projection containing the connection with said second end of said filament and said second support pin and the remainder of said filament shield, whereby the electrical short circuit previously provided between the ends of said filament through said filament shield is removed.
3. In an automotive headlamp of the type containing a helical filament and a filament shield, the filament and shield assembly comprising:
(a) a flat flange containing a generally rectangular depression;
(b) a mounting flange containing a longitudinal concavity adapted to assembly to a mounting pin;
(c) a second depression in said flat flange adapted to providing clearance for one leg of a lamp filament;
(d) a bump in said flat flange adapted to welding attach-ment of a second leg of a lamp filament; and (e) a lamp filament having first and second legs fitted within said generally rectangular depression and having said first leg passing through said second depression to a welded attach-ment to a mounting pin, said second leg being welded to said bump.
(a) a flat flange containing a generally rectangular depression;
(b) a mounting flange containing a longitudinal concavity adapted to assembly to a mounting pin;
(c) a second depression in said flat flange adapted to providing clearance for one leg of a lamp filament;
(d) a bump in said flat flange adapted to welding attach-ment of a second leg of a lamp filament; and (e) a lamp filament having first and second legs fitted within said generally rectangular depression and having said first leg passing through said second depression to a welded attach-ment to a mounting pin, said second leg being welded to said bump.
4. A headlamp filament and shield assembly comprising:
(a) a flat flange containing a generally rectangular depression;
(b) a mounting flange containing a longitudinal concavity at one edge of said flat flange;
(c) a lateral projection at the edge of said flat flange remote from said mounting flange;
(d) said flat flange containing a second depression adjacent to said lateral projection;
(e) a bump in the same side of said flat flange as said lateral projection; and (f) a lamp filament having first and second legs suspended within said generally rectangular depression said first filament leg being welded to said bump and said second filament leg passing through said second depression and being welded to said lateral projection.
(a) a flat flange containing a generally rectangular depression;
(b) a mounting flange containing a longitudinal concavity at one edge of said flat flange;
(c) a lateral projection at the edge of said flat flange remote from said mounting flange;
(d) said flat flange containing a second depression adjacent to said lateral projection;
(e) a bump in the same side of said flat flange as said lateral projection; and (f) a lamp filament having first and second legs suspended within said generally rectangular depression said first filament leg being welded to said bump and said second filament leg passing through said second depression and being welded to said lateral projection.
5. A lamp filament shield comprising:
(a) a flak flange containing a generally rectangular depression;
(b) a mounting flange containing a longitudinal con-cavity at one edge of said flat flange;
(c) a lateral projection at the edge of said flat flange remote from said mounting flange;
(d) said flat flange having a second depression adjacent to said lateral projection; and (e) a bump in the same side of said flat flange as said lateral projection.
(a) a flak flange containing a generally rectangular depression;
(b) a mounting flange containing a longitudinal con-cavity at one edge of said flat flange;
(c) a lateral projection at the edge of said flat flange remote from said mounting flange;
(d) said flat flange having a second depression adjacent to said lateral projection; and (e) a bump in the same side of said flat flange as said lateral projection.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/673,400 US4058749A (en) | 1976-04-05 | 1976-04-05 | Filament shield for sealed headlamp and mounting method therefor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1074843A true CA1074843A (en) | 1980-04-01 |
Family
ID=24702502
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA275,249A Expired CA1074843A (en) | 1976-04-05 | 1977-03-31 | Filament shield for sealed headlamp and mounting method therefor |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US4058749A (en) |
| JP (1) | JPS52121985A (en) |
| CA (1) | CA1074843A (en) |
| DE (2) | DE7710821U1 (en) |
| ES (1) | ES227686Y (en) |
| FR (1) | FR2348570A1 (en) |
| GB (1) | GB1517897A (en) |
| IT (1) | IT1086637B (en) |
| MX (1) | MX144880A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6426248U (en) * | 1987-07-16 | 1989-02-14 | ||
| DE19707245A1 (en) * | 1997-02-25 | 1998-08-27 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Method of making an electric light bulb |
| US20040202004A1 (en) * | 2003-04-09 | 2004-10-14 | Guide Corporation, A Delaware Corporation | Bifunctional headlamp having a rotating shield with integral actuator |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1216254A (en) * | 1958-02-17 | 1960-04-25 | Lampe Rationnelle | Headlamp for automobiles and other motor vehicles |
| DE1248158B (en) * | 1960-03-08 | 1967-08-24 | Karl Nowak O H G Spezialfabrik | Electric light bulb for automobile headlights |
| FR90823E (en) * | 1966-06-09 | 1968-02-23 | Lampes Elect Fab Reunies | Electric lamp base |
| DE1901179A1 (en) * | 1969-01-10 | 1970-08-06 | Patra Patent Treuhand | Two-filament halogen light bulb for motor vehicle headlights |
| BE788518A (en) * | 1971-09-09 | 1973-03-07 | Philips Nv | ELECTRICAL INCANDESCENCE LAMP |
| JPS5138244Y2 (en) * | 1971-09-30 | 1976-09-18 | ||
| NL7306006A (en) * | 1973-05-01 | 1974-11-05 | ||
| GB1477138A (en) * | 1973-11-14 | 1977-06-22 | British Sealed Beams Ltd | Filament shields |
-
1976
- 1976-04-05 US US05/673,400 patent/US4058749A/en not_active Expired - Lifetime
-
1977
- 1977-03-31 CA CA275,249A patent/CA1074843A/en not_active Expired
- 1977-04-04 GB GB14072/77A patent/GB1517897A/en not_active Expired
- 1977-04-04 IT IT48817/77A patent/IT1086637B/en active
- 1977-04-05 DE DE7710821U patent/DE7710821U1/en not_active Expired
- 1977-04-05 MX MX168649A patent/MX144880A/en unknown
- 1977-04-05 DE DE19772715226 patent/DE2715226A1/en not_active Withdrawn
- 1977-04-05 JP JP3820677A patent/JPS52121985A/en active Granted
- 1977-04-05 FR FR7710287A patent/FR2348570A1/en active Granted
- 1977-04-05 ES ES1977227686U patent/ES227686Y/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES227686Y (en) | 1979-12-01 |
| JPS542517B2 (en) | 1979-02-08 |
| FR2348570B1 (en) | 1979-03-23 |
| MX144880A (en) | 1981-11-30 |
| US4058749A (en) | 1977-11-15 |
| GB1517897A (en) | 1978-07-19 |
| DE7710821U1 (en) | 1977-09-22 |
| ES227686U (en) | 1977-06-01 |
| JPS52121985A (en) | 1977-10-13 |
| DE2715226A1 (en) | 1977-10-13 |
| IT1086637B (en) | 1985-05-28 |
| FR2348570A1 (en) | 1977-11-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |