U.S. patent number 3,757,102 [Application Number 05/299,804] was granted by the patent office on 1973-09-04 for lamp capsule.
This patent grant is currently assigned to Daniel Woodhead Inc.. Invention is credited to Earl W. Roberts.
United States Patent |
3,757,102 |
Roberts |
September 4, 1973 |
LAMP CAPSULE
Abstract
A lamp capsule and uses thereof in electrical receptacles,
connectors and plugs for indicating circuit-energization and
location in dark areas. The capsule consists of a
light-transmitting, tubular, dielectric, synthetic polymer capsule
having an open end and a closed end encapsulating a small neon lamp
having a pair of bare wires projecting from its base. One wire
extends through an opening in the closed end of the capsule and the
other wire is curvately bent at its end adjacent the base of the
lamp and extends along the lamp and out the open end of the
capsule.
Inventors: |
Roberts; Earl W. (Lake Bluff,
IL) |
Assignee: |
Daniel Woodhead Inc.
(Northbrook, IL)
|
Family
ID: |
23156374 |
Appl.
No.: |
05/299,804 |
Filed: |
October 24, 1972 |
Current U.S.
Class: |
362/652;
340/815.49; 439/490 |
Current CPC
Class: |
F21V
33/00 (20130101) |
Current International
Class: |
F21V
33/00 (20060101); F21v 033/00 () |
Field of
Search: |
;240/2R,2SP,8.16,153
;339/145,176L,200,201,213 ;340/381 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Braun; Fred L.
Claims
The invention is hereby claimed as follows:
1. A lamp capsule comprising a synthetic polymer
light-transmitting, dielectric capsule having an open end and a
closed end portion, an opening in the closed end portion of the
capsule, said capsule having therein a small lamp having bare wires
projecting from the base thereof, one of said wires extending
through said opening, and the other of said wires running along the
lamp and out the open end of the capsule.
2. A lamp capsule as claimed in claim 1, a small resistor connected
in the other of said wires, and said resistor being substantially
completely positioned within the capsule at the open end
thereof.
3. A lamp capsule as claimed in claim 1, said closed end being an
end wall having a diagonal corner wall portion with said opening
therein, said base of said lamp being spaced from the opposite
corner of said end wall, and said other of said wires extending
curvately from said base through the space in said opposite corner
and then along said lamp.
4. A lamp capsule as claimed in claim 1 mounted inside an
electrical connector having a translucent or transparent body
portion, terminal posts for connection of current wires within said
body portion, and the wires of the lamp being connected to said
terminal posts whereby light from the lamp is visible through said
translucent or transparent body portions.
5. A lamp capsule as claimed in claim 4, said connector having a
dielectric, opaque housing and a light-transmitting face with the
plug-receiving openings therein.
6. A lamp capsule as claimed in claim 1 mounted in a
light-transmitting housing, terminal posts for connection of
current wires within said housing, and the wires of the lamp being
connected to said terminal posts whereby light from the lamp is
visible through said housing.
7. A lamp capsule as claimed in claim 6 wherein said housing is the
housing of an electrical plug having its contact blades
electrically connected with said terminal posts.
Description
This invention concerns improvements in encapsulation of small
lamps, such as low wattage neon lamps. The lamp and its capsule are
advantageously used in electrical receptacles, connectors and/or
plugs by connecting the lamp wires across terminal posts of such
receptacles, connectors and/or plugs. This combination provides a
continuous emission of light from the lamp whenever the connector,
receptacle and/or plug is energized. By making a portion of the
connector, receptacle and/or plug from a light-transmitting
material, e.g., a transparent or translucent synthetic polymer, the
light from the small lamp is visible from within the housing
forming the connector, receptacle or plug.
This light emission has several practical uses, one of which is the
function of an indicator that the circuit of a connector or a
receptacle is actually energized. Personnel using such connectors
or receptacles therefore will not be misled in believing them to be
energized at the time they are connected with an electrical plug.
In case of lighted plugs, personnel can ascertain at the time of
insertion of such plugs by the presence or absence of the emitted
light whether or not the plug is connected to an energized
receptacle or connector. Another practical feature of the lighted
connectors, receptacles and/or plugs is their visability in dark
areas. This is a safety feature which allows ready location of
extension cords having lighted connectors, or plugs which are
inserted in unlighted or lighted connectors or receptacles.
THE INVENTION
The invention herein pertains to improvements in lamp capsules
which encapsulate small lamps used for the purposes aforesaid. The
lamp capsules preferably are made of light transmitting,
dielectric, synthetic polymer in a tubular form of circular or oval
cross section. The capsules have an open end and a closed end
portion. An opening is provided in the closed end portion,
preferably in the end wall. A small lamp such as a small neon lamp
having bare wires projecting from the base of the lamp is inserted
in the open end of the capsule.
One of the bare wires extends through the opening in the closed end
portion. The other bare wire is bent curvately at its base and runs
along the side of the lamp and out of the open end of the capsule.
This wire contains a small ballast resistor used in the lamp
circuit.
The capsule has as its closed end an end wall having a diagonal
corner wall portion. The base of the lamp lies contiguous to the
intersection of the diagonal corner portion and the side wall of
the capsule. The opposite corner of the end wall is spaced from the
base of the lamp, whereby the curvately bent wire is accommondated
in a space provided at the opposite corner prior to its running
along the side of the lamp. The ballast resistor preferably is
substantially completely positioned within the capsule at its open
end.
After the lamp is inserted in the capsule, connectors such as metal
U-blades are attached to the projecting portions of the wires
contiguous to the respective ends of the capsule. The bare wires
are thus substantially completely located within the confines of
the capsule and are positioned therein in a manner avoiding
possible accidental touching of the bare wires within the
capsule.
This assembly of the lamp capsule may be mounted across terminal
posts of electrical connectors, receptacles, or plugs. When the
latter are energized, a light will be emitted from the small lamp
and transmitted through transparent or translucent portions of
these electircal devices for the purposes aforesaid.
THE DRAWINGS
Preferred embodiments of the invention are illustrated in the
drawings, wherein:
FIG. 1 is a side elevation of the capsule and lamp in a state of
initial assembly;
FIG. 2 is a side elevation of the lamp and capsule in the assembled
state with U-blade connectors attached to the lamp wires;
FIG. 3 is a top plan view of the assembly of FIG. 2;
FIG. 4 is a perspective view of an electrical connector having a
light-transparent, terminal post-bearing member forming the
plug-receiving face of the connector;
FIG. 5 is a side elevation of the transparent, terminal
post-bearing member of FIG. 4 with the light capsule connected
across its terminal posts; and
FIG. 6 is an exploded view in side elevation of a right-angle
electrical plug with the lamp capsule mounted across its terminal
posts.
THE ILLUSTRATED EMBODIMENTS
Referring to the drawings, a small lamp 10 having a low wattage
rating, e.g., a neon lamp having a long continuous life, comprises
a pair of electrodes 11 and 12 connected by bare wires 13 and 14
extending through the base 15 of the lamp envelope 16. The wire 14
contains a ballast resistor 17 connected in the wire 14 so that it
lies adjacent the small tip 18 at the tapered end of the lamp 10
when the wire 14 is configured as shown in FIGS. 1 and 2.
The lamp 10 is encapsulated in a dielectric, light-transmitting,
synthetic polymer capsule 20, preferably having a circular or oval
cross section. The capsule 20 is a tubular capsule having an open
end 21 and a closed end 22. The latter is provided with a diagonal
corner wall portion 23 provided with a small opening 24 through
which the wire 13 projects. In the assembled combination, the base
15 of the lamp 10 is drawn by the wire 13 into a position
contiguous to the juncture 25 between the diagonal corner wall
portion 23 and the circular or oval side wall 29 of the
capsule.
This positioning of the lamp 10 in the capsule 20 keeps the base 15
spaced from the opposite corner portion 27 of the closed end 22 of
the capsule -- providing therein a space 26 to accommodate the
curvately bent (180.degree.) portion 28 of the bare wire 14. A
U-blade, terminal post connector 30 and 31 is clamped or soldered
onto the projecting end of the respective wires 13 and 14 after the
lamp has been inserted in the capsule 20. The connectors preferably
have their bases 32 contiguous to the respective ends 21 and 22 of
the capsule 20 -- leaving a minimum amount of the bare wires 13 and
14 outside the capsule 20.
FIGS. 4-6 illustrate uses of the encapsulated lamp of FIGS. 1-3 in
electrical connectors, receptacles and plugs. The extension cord
connector 35 of FIGS. 4 and 5 has an opaque, dielectric,
cylindrical housing 36, e.g., one made of a synthetic elastomeric
polymer. The extension cord or cable 37 enters one end of the
housing 36 having a cord or cable clamp 38 attached thereto. The
cylindrical end 39 of the housing has a disc end wall 40 with a
rounded cornered, triangular opening in which the corresponding
shaped section 42 of a transparent molded plastic polymer body 41
is seated. The body 41 includes a rearward segment 43 of
cylindrical shape with three rectilinear relief recesses 44 spaced
equi-distant around its periphery.
The body 41 is a back-wired connector having a Y-divider wall 45 of
the type shown in U.S. Pat. No. 3,617,981, issued to David E.
Kramer on Nov. 2, 1971. The respective ends of the three wall
segments of wall 45 are coplanar with and above the relief recesses
44.
The three spaces between the three wall segments have therein three
terminal posts, one for a ground pin-ground wire connection (not
shown). The other two terminal posts 46 and 47 for the live wire
connections have the U-blade connectors 30 and 31 mounted thereon
by the screws 48 and 49, which also are used to connect the live
wire connections for the wires of the cord or cable 31. As can be
seen in FIG. 5, the lamp capsule 20 lies across the rearward edges
of the Y-divider wall 45.
The electrical plug 50 of FIG. 6 is a right angle plug, i.e., one
with its contact blades at right angles to the entrant direction of
its electrical cable or cord. Its cap or housing 51 is made as a
hollow molding of light-transmitting (transparent or translucent)
synthetic polymer. Its male, contact blade-and-ground pin mounting
base 52 is also a molding of synthetic polymer which is mounted
across the open side 53 of the housing 51 by two or more screws 54
threaded into cylindrical screw-receiving columns 55 at the four
inner corners of the housing 51.
The housing 51 has a hollow, upper, lateral extension 56 through
which extends the electrical cord or cable 57. A hollow cord or
cable-clamping segment 58 is attached to the extension 56 by screws
59 to form therewith a lateral extension from the housing 51.
The blades 60 and ground pin 61 of plug 50 and the blade-receiving
openings 62 and ground-pin-receiving opening 63 of connector 35 may
have any industry-standardized, industry-accepted, or special
cross-section, length, spacing and relative geometric positioning.
The illustrated embodiments show a commonly used configuration for
non-locking plugs and connectors approved by the National
Electrical Manufacturers Association for grounded 125 volt circuits
of low ampere rating.
It is thought that the invention and its numerous attendant
advantages will be fully understood from the foregoing description,
and it is obvious that numerous changes may be made in the form,
construction and arrangement of the several parts without departing
from the spirit or scope of the invention, or sacrificing any of
its attendant advantages, the forms herein disclosed being
preferred embodiments for the purpose of illustrating the
invention.
* * * * *