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De'c. 31, 1946. .
' 2,413,662
R. B. THOMAS
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Filed Aug._ 21, 1945‘
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Attorney
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Patented Dec. 31, 1946
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UNITED STATE s PATENT OFFICE
2,413,662
LAMP BASE
> Ralph B. Thomas, Beverly, Mass., assignor to Syl
vania Electric Products Inc., Salem, Mass, a
corporation of Massachusetts
Application August 21, 1945, Serial No. 611,747
4 Claims. 401. 176-122)
1
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of insulating material and are held together by
This invention relates to discharge lamps and
particularly to such lamps which are bent into
curved forms and having their ends in opposed
relation.
,
any suitable means such as the screw ‘I, the head
of which‘ is seated in portion 5 and having its
other end threaded in the part 6. Such construc
tion permits the lamp base to be assembled upon
the lamp. A pair ‘of dowel-shaped projections I‘!
are formed along the edges of the ‘section 5 of
base 2 and holes to match these projections i8
are formed in section 6 to prevent relative lateral
-
In lamps of the type indicated, it is necessary
to provide special means for making the neces
sary connections ‘for energizing the lamp. It is
an object of the present invention to provide
means for readilyv connecting the lamp to a source
of power.
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10
chamber recesses 8 within which the endsof the
lamp are loosely received. The ends of the lamp
a bent tubular lamp having a base joining its
ends which is rotatable into a plurality of posi
tions.
,
.
movement thereof.
' The ends of the base 2 are formed to present
A further object of the invention is to provide
project a substantial distance into the recesses 8
15
to insure the base will not become detached from
the lamp. In the form of the invention shown
in Figure 2 a relatively large central chamber 9
posed in opposed relation, a base which is readily
is formed within which the flexible lamp lead
applied to the lamp at a minimum cost.
wires l0 are received. The interior surface of the
A further object of the invention is to create
, ‘a greater transmission of incident light emitting 20 chamber portion 9 may be etched or sandblasted
as shown in Figure 2 or ribbed, ?uted, or other
from the lamp.
wise roughened as shown in Figure 3.
A further object of the invention is to obtain
The ends of the lamp are, or may be, of stand- '
a complete circle of light with minimum inter
A further object of the invention is to pro
vide in a bent tubular lamp having its ends dis
ruption-caused by the base.
ard construction having a reentrant ?are portion
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tube and
A feature of the invention is the use of a trans 25 II and a press portion l2 within the The
lead
_
supporting
the
lamp
electrodes
I3.
parent or translucent plastic, etched or roughened
wires in ‘are preferably covered with a light-re
on its surface.
Another feature of this invention is the use
of light-re?ecting insulating material on the lead
wires.
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Still another feature of the invention is that
_ ?ecting electrical insulating material'and are sol
dered to the inner ends of a pair of conducting
30 pins 14, which are staked or molded in position
4 in the base section 6 and are spaced the correct
no cement is used to secure the lamp to the base.
distanceto be received in a socket made to re
ceive them not shown in the drawing. Either
two or four pins may be employed depending upon
is a greater transmission of light from the lamp.
Other objects, features, and advantages of the 35 the type of lamp used and its circuit require
ments.
invention will be apparent from the following
‘It is desirable that the base 2 be restricted in ‘
description taken in conjunction with the draw
its rotation to prevent excessive twisting of the
ing in which:
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An angular adjustment of 180° is
‘ lead wires.
Figurel is a perspective view of a lamp em
su?icient to adapt the lamp to any installation.
40
bodying the invention;
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A desirable means for accomplishing this end
Figure 2 is a longitudinal sectional view
is
to form a projection l5 upon the end face of
through the lamp base and socket; and
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the
lamp at or near its periphery. Stop shoulders
Figure 3 is a longitudinal sectional view similar
are provided which engage the projection l5 at
to Figure 2 showing a different embodiment of
45 the limit of the travel of the base 2. Stop shoul
the invention.
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ders may be provided in any suitable manner. As
Figure 1 shows a circular lamp I having a lamp
illustrated in the drawing the portion of at least
base 2 and conductor pins 3.
I
one of the recesses 8 formed in the section 5 of
In Figure 2 the circular lamp I has end pieces
the
base 2 is relatively shallow in depth while
4 which desirably are parallel and symmetrical
that
portion formed in the section 5 is of greater
50
ly disposed in respect to a radius from the center
depth and su?icient to receive projection IS. The
of the lamp circle.‘ The lamp base 2 is cm
differencein depth between the two portions of
structed of transparent or translucent plastic
_ the recesses 8 presents stop shoulders I6 which
material in the form of a hollow cylinder divided
engage the projection l5.
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longitudinally into two sections 5 and 6, these sec
tions desirably being molded or otherwise formed 55 A base of the type herein described may read
An advantage of the invention is that there _
’ 2,418,862
ily ‘be molded or otherwise formed from the‘ I lindricai base'member loosely embracing the ends
many thermoplastic or thermosetting plastic ma
of the lamp and extending therebetween where
by the base ‘may be rotated thereon, said base be
terials now in general use. It is generally more
ing formed of translucent plastic, lead wires,
desirable however, to use those materials which
' covered with a light re?ecting insulating material,
are thermosettin'g since they are more stable-un
connected to the lamp electrodes and extending
der heat. It the base is formed or a transparent
into said base, contact pins projecting or_ opening
material it is desirable to etch ‘or sandblast the
suriaces to create a more‘even illumination from
into ,the‘hollow interior of the base with their
other ends projecting outward for connection to
the base. An irregular surface such as caused
by ?uting, ribbing, or otherwise roughing the cen 10 a source of energy and means to connect said lead
_ wires to said pins. I‘
tral chamber permits a larger surface for the in
2.‘ In combination with a tubular discharge
cident light to fall upon and causes a greater and
lamp, 2. base of translucent material having lead
more even distribution of light emission through
the socket. In order to reduce the amount of ' ' wires covered with light-re?ecting insulating ma
light absorption from the lead wires inside the 15
socket a coating of light-re?ecting electrical in
sulating material is applied to them. A base of
the type herein described is favorably suited to
the utilization of the incident light from the lamp
terial.
v,
3. An electric discharge device for forming a
, complete circle of light emission, comprising a
circular glass dischargetube sealed'at each of
its ends to form an incomplete circle, a tubular
since no cement is used in securing the lamp and 20 base of vtranslucent material joining said ends and
being substantially free of obstruction, to permit
socket thus leaving an unobstructed passage for
diffusionthrough said base of the light from the
light through the base.
sealed ends of said tube‘.
'
This application is a continuation in part of my
'4. The combination of claim 3, contact pins ex
co-pending application Serial No. 585,260, ?led
March 28, 1945, which issued January 8, 1946, as 25 tending outward from said base, lead-in wires
extending through the sealed ends of said tube to
United States Patent No. 2,392,785.
said pins, and a light-re?ecting electrically-in
What I claim is:
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,1. In combination with a tubular discharge . sulating material over said lead-wires to reduce
lamp of non-linear con?guration having its ends
disposed in spaced opposed relation, a hollow 057- 30
light loss by said wires.
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RALPH B. THOMAS.
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