U.S. patent number 3,885,185 [Application Number 05/456,097] was granted by the patent office on 1975-05-20 for incandescent lamp.
Invention is credited to Ralph E. Tilley.
United States Patent |
3,885,185 |
Tilley |
May 20, 1975 |
Incandescent lamp
Abstract
An incandescent lamp having a bulb and a male base at the
trailing end thereof for placement in a conventional threaded
electrical socket, the male base comprising a ring conductor
secured to the necked down portion of the bulb and from which a
plurality of electrically conductive resilient fingers rearwardly
extend, the unrestrained composite diameter of the resilient
fingers being less than the inside diameter of the conventional
electrical socket. A second axial conductor projects rearwardly
from the base of the lamp, being insulated from the ring connector
by suitable dielectric whereby the male end of the lamp may be
linearly inserted into the socket causing constriction of the
fingers creating a firm electrical connection with the threaded
peripheral conductor of the socket, the axial conductor of the lamp
coming to rest against the exposed spring of the axial conductor of
the socket whereby electrical energy is communicated to the
filament of the lamp.
Inventors: |
Tilley; Ralph E. (Salt Lake
City, UT) |
Family
ID: |
23811409 |
Appl.
No.: |
05/456,097 |
Filed: |
March 29, 1974 |
Current U.S.
Class: |
313/318.03;
313/318.04; 313/315; 439/366; 439/613 |
Current CPC
Class: |
H01K
1/42 (20130101) |
Current International
Class: |
H01K
1/42 (20060101); H01j 005/48 (); H01j 005/50 () |
Field of
Search: |
;313/315,318
;339/242,258R,258P,91L |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Chatmon, Jr.; Saxfield
Attorney, Agent or Firm: Foster; Lynn G.
Claims
What is claimed and desired to be secured by United States Letters
Patent is:
1. An incandescent lamp for rectilinear insertion into press-fit
conducting relation with a conventional threaded electrical socket
comprising:
a bulb having an axis, the bulb containing a filament and having a
necked down trailing end;
first conductor means connected to one end of the filament and
mounted to the necked down trailing end of the bulb, said first
conductor means comprising a plurality of axially extending,
rearwardly directed, and outwardly radially biased resilient
conductive fingers with memory, each finger being initially
resiliently biased a predetermined radial distance from the axis of
the bulb to form an initial composite diameter greater than the
diameter of said threaded socket;
second conductor means carried in exposed relation at the trailing
end of the bulb and connected to the other end of the filament;
and
electrical insulating means disposed between the first and second
conductor means;
whereby the resilient fingers are inwardly deflected reducing said
composite diameter to one equal to the socket diameter upon
rectilinear insertion of the trailing end of the lamp into the
socket, the memory of the resilient fingers insuring electrical
conduction with a conductor at the socket threads.
2. The incandescent lamp of claim 1 wherein the fingers are each
joined to a conductive ring carried at the trailing end of the bulb
and comprising said first conductor means.
3. The incandescent lamp of claim 1 wherein each finger is inwardly
curved so that the free end thereof is situated well within said
composite diameter.
4. The incandescent lamp of claim 1 wherein said electrically
insulating means is stepped.
Description
BACKGROUND
1. Field of Invention
The present invention relates generally to the field of artificial
light and more particularly to an improved male base at the
trailing end of an incandescent lamp for linear placement in a
conventional, threaded electrical socket.
2. Prior Art
Many past proposals have been made for electrically connecting the
male end of an incandescent lamp to an electrical socket. The
standard for many years has been a lamp with a threaded trailing
conductor and a trailing axial conductor separated by a suitable
dielectric layer. The threaded lamp is screwed into and out of the
conventional socket.
Alternatives have consisted of lamps each with a specially
configurated male conductor end to be united with a specially
configurated (non-standard) electrical socket. No proposal has been
made for placement of an incandescent lamp rectilinearly into a
standard threaded electrical socket.
BRIEF SUMMARY AND OBJECTS OF THE PRESENT INVENTION
The present invention comprises an economical incandescent light
bulb which is linearly press-fit into a conventional threaded
electrical socket thereby eliminating the need to thread a bulb
into said socket. The light bulb comprises one peripheral conductor
at the reduced diameter trailing end of the bulb, having rearwardly
directed resilient fingers biased radially outwardly and having an
unrestrained composite diameter greater than that of the socket,
the fingers being mounted to the glass of the bulb and inwardly
radially displaceable counter to the memory of the fingers upon
entry of the fingers into the threaded socket to firmly retain the
connection.
Accordingly, it is a primary object of this invention to provide an
improved incandescent light bulb to be linearly press-fit into and
releasably retained in a conventional threaded electrical
socket.
It is another paramount object of the present invention to provide
an electric light bulb one conductor of which is disposed at the
reduced diameter trailing of the bulb comprising rearwardly
directed resilient conductive fingers radially biased outward
having an unrestrained composite diameter greater than the diameter
of a conventional threaded electrical socket to accommodate radial
deflection inwardly of the fingers whereby the bulb becomes
releasably press-fit into the socket by axial insertion.
These and other objects and features of the present invention will
be apparent from the following detailed description, taken with
reference to the accompanying drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective representation of a presently preferred
light bulb configuration according to the present invention;
FIG. 2 is an enlarged side elevation view with parts broken away
for clarity of the light bulb of FIG. 1 disposed adjacent a
conventional electrical socket; and
FIG. 3 is a side elevation view similar to FIG. 2 but showing the
light bulb in press-fit electrically conducting relation with the
socket.
DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
Reference is now made to FIGS. 1-3 which illustrate the structure
and use of a presently preferred incandescent light bulb 10
according to the present invention. Conventionally, the
incandescent lamp 10 comprises a glass bulb 12 in which a filament
is disposed. The glass bulb 12 is necked down or of reduced
transverse diameter at the trailing end 14 thereof, the trailing
end 14 being bonded or otherwise suitably physically attached to a
ring conductor 16. The ring connector 16 is electrically connected
to one end of the filament within the glass bulb 12 and comprises
an annular collar 18 from which a plurality of rearwardly extending
conductive fingers 20 project. Each finger is radially biased
outwardly and rearwardly to a maximum diameter d.sub.1 (FIG. 2),
which is of considerably greater magnitude than the diameter
d.sub.2 of a conventional threaded electrical socket 22.
Each finger also curls inwardly at its trailing end 24 to (a)
prevent free end interference upon insertion into or removal from
the socket 22, (b) restrict the amount of deflection experienced by
each finger 20 by reason of contact with the rearwardly extending
central refractory separator 26 and (c) prevent electrical contact
with the central socket conductor. The refractory separator 26 is
stepped in diameter at radially directed portion 28 and comprises a
relatively large annular wall 30 superimposed against and
insulating the fingers 20 from a second axial conductor 32, the
exposed end of which is also electrically insulated by a reduced
diameter wall 34 of the refractory separator 26. Conductor 32 is
electrically connected to the other end of the filament.
As mentioned, the socket 22 is conventional comprising a dielectric
body 36 a peripheral threaded conductor 38, the diameter across the
root of the threads being designated d.sub.2, and comprising axial
socket conductor 40 connected to a conductive exposed U-shaped
spring 42.
In use, the incandescent lamp 10 is advanced linearly and
essentially axially into initial contact with and ultimate into
retained press-fit relation within the socket 22, with the
conductor 16 becoming disposed in electrical contact with the
peripheral threaded conductor 38 and conductor 32 in electrical
contact with the spring 42. Insertion results in a constriction of
the composite diameter from d.sub.1 by deflection of the radially
biased fingers 20 to a composite diameter equal to the socket
diameter d.sub.2. The fingers 20 exert an outward bias against the
socket 22 when located within the socket 22 to retain in the
inserted condition against inadvertent removal. The assembled
condition is illustrated in FIG. 3. This approach allows for linear
insertion of a bulb in a conventional socket which is beneficial to
the infirmed and useful when a socket is located in a hard to reach
place.
The invention may be embodied in other specific forms without
departing from the spirit or essential characteristics thereof. The
present embodiment is therefore to be considered in all respects as
illustrative and not restrictive, the scope of the invention being
indicated by the appended claims rather than by the foregoing
description, and all changes which come within the meaning and
range of equivalency of the claims are therefore intended to be
embraced therein.
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