U.S. patent number 3,634,680 [Application Number 05/060,366] was granted by the patent office on 1972-01-11 for plug-in flashlight extension.
Invention is credited to Truman L. Myrah.
United States Patent |
3,634,680 |
Myrah |
January 11, 1972 |
PLUG-IN FLASHLIGHT EXTENSION
Abstract
A plug-in flashlight extension embodies an extension cord having
a plug which is removably insertable in a jack carried by a
flashlight assembly and connected in circuit with a switch carried
by the flashlight casing and which may be the conventional
digitally operable reciprocably slidable or button switch with
which flashlights are equipped and which operate on the principle
of connection to one pole of the battery or batteries through the
flashlight casing where it is metal or through a conductor in or on
the casing, and the opposite pole of the battery or batteries
through a conductor insulated from the casing or the
first-mentioned conductor. In one desirable arrangement, the jack
is provided with means to disconnect the switch circuit from the
conventional front-end light bulb socket. In another arrangement
the jack is adapted to replace the front-end lamp bulb socket. A
storage compartment is optionally provided for the extension cord
when not in use. A probe light extension is optionally provided for
the extension cord.
Inventors: |
Myrah; Truman L. (Northlake,
IL) |
Family
ID: |
22029040 |
Appl.
No.: |
05/060,366 |
Filed: |
August 3, 1970 |
Current U.S.
Class: |
362/184; 324/506;
362/198 |
Current CPC
Class: |
F21L
2/00 (20130101); F21V 23/00 (20130101); F21L
4/00 (20130101) |
Current International
Class: |
F21L
4/00 (20060101); F21V 23/00 (20060101); F21l
007/00 () |
Field of
Search: |
;240/2.18,6.4,10.5,10.6,10.66,10.67,10.68,10.65,10.69 ;136/181
;324/53 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Capozi; Louis J.
Claims
I claim as my invention:
1. In a flashlight assembly including a tubular casing providing a
battery chamber and having a digitally operable switch movable
between open circuit and closed circuit positions to control a
flashlight circuit between opposite poles of a battery in said
chamber:
a jack mounted on the casing and having separate electrical
connections with the casing and the battery; and
a lamp-carrying electrical extension having a plug with
electrically separate poles separably engageable in said jack to
bridge said electrical jack connections to enable controlling
illumination of the extension lamp by operation of said switch
between its open circuit and closed circuit positions.
2. A flashlight assembly according to claim 1, said casing being
electrically conductive and having an electrically conductive rear
end closure thereon, said jack being mounted on said closure, one
of the jack connections being with said closure and through the
closure with said casing, an electrically conductive spring
bottomed on said closure and thrusting into electrical engagement
with the adjacent end of a battery, and the other of said
connections being with said spring.
3. A flashlight assembly according to claim 2, one of said
connections comprising a pair of normally closed contacts
connecting said connections to close the flashlight circuit
controlled by said switch to enable operation of the switch to
illuminate a front-end lamp of the flashlight assembly, said plug
being operable to open said contacts.
4. A flashlight assembly according to claim 1, including a lamp
mounted on a front end of the casing and connected in said circuit,
means normally acting through said separate electrical connections
to enable controlling illumination of said front-end lamp by means
of said switch, and means controlled by said plug when inserted in
said jack to disable said means for connecting said electrical
contacts so that only the lamp of the extension will be illuminated
when the switch is in the closed position.
5. A flashlight assembly according to claim 1, said casing having
means at one end for supporting a conventional lamp to be
controlled by said switch and having said jack mounted at the
opposite end of the casing with a spring normally thrusting the
battery toward the front-end lamp, means on said jack normally
completing a circuit through the control circuit so that operation
of the switch will control said front-end lamp, said means being
disabled by engagement of said plug within said jack, said
electrical connections comprising separate terminals on said jack,
and respective leads connecting one of said terminals to said
spring and the other of said terminals to said switch.
6. A flashlight assembly according to claim 1, including an
electrically conductive end closure on one end of said casing
carrying said jack, an electrically conductive spring between said
end closure and said battery, an insulator between said spring and
said end closure, one of said electrical connections comprising a
terminal in electrical contact with said spring between said spring
and said insulator, and the other of said electrical connections
comprising a terminal in electrical engagement with said end
closure.
7. A flashlight assembly according to claim 1, in which said casing
has a front-end lamp-supporting device, said jack being replaceably
carried by said lamp-supporting device with one of said electrical
connections being effected with a front pole of the battery, and
the other of said electrical connections being effected through a
conductor leading to said switch.
8. A flashlight assembly according to claim 1, one of said separate
electrical connections being through a conductor leading to said
switch, and the other of said electrical connections being with one
pole of the battery.
9. A flashlight assembly according to claim 1, including an
electrically conducting storage container for receiving the
extension when disconnected from said jack and not in use, and
constructed and arranged to be housed within the casing in tandem
with the battery.
10. A flashlight assembly according to claim 1, in which said
extension comprises a flexible lead cord provided at one end with
said plug and at the opposite end with a lamp socket in which a
lamp is removably receivable, and a rod probe extension having a
base electrically receivable in said socket and provided at its
opposite end with a lamp electrically connected through said base
and said socket with said cord.
Description
This invention relates to improvements in flashlight structures and
is more particular concerned with a plug-in jack extension
device.
Heretofore flashlights have been equipped with various types of
probes and testing devices which employ the conventional front-end
lamp in the circuit. Insofar as I am informed, there has not
heretofore been provided or suggested a flashlight equipped to
receive a plug-in lamp-equipped extension, and more particularly
such an extension which can be energized to illuminate a lamp
carried thereby alternatively to the conventional front-end lamp
such as is commonly mounted in a socket behind a lens and in
contact with the front-end battery pole.
A principal aim of the present invention is to provide such a
plug-in lamp extension.
An important object of the present invention is to implement the
provision of a plug-in lamp extension for flashlights.
Another object of the invention is to provide a lamp extension for
flashlights adapted to be operated alternatively to the
conventional lamp carried by a flashlight.
A further object of the invention is to provide a lamp extension
for flashlights adapted to be controlled by the regular switch of
the flashlight assembly.
Still another object of the invention is to provide a lamp
extension assembly for flashlights involving a jack which is
selectively operable in the regular flashlight circuit.
Still another object of the invention is to provide a new and
improved flashlight equipped with a plug-in jack device at the rear
end thereof.
A still further object of the invention is to provide a jack
structure for a plug-in extension which is adapted to replace the
conventional flashlight bulb.
It is also an object of the invention to provide new and improved
means for storing a flashlight extension.
Among other objects of the invention is the provision of a
versatile flashlight extension adapted to be equipped with a
replaceable probe light .
Other objects, features and advantages of the invention will be
readily apparent from the following description of certain
preferred embodiments thereof, taken in conjunction with the
accompanying drawing, although variations and modifications may be
effected without departing from the spirit and scope of the novel
concepts embodied in the disclosure, and in which:
FIG. 1 is a side elevational view, partially in section, showing a
conventional flashlight equipped with a jack and plug-in extension
embodying features of the invention;
FIG. 2 is a top or inside plan view of a modified arrangement of
the jack;
FIG. 3 is a transverse sectional detail view taken substantially
along the line III--III of FIG. 2;
FIG. 4 is a longitudinal sectional detail view, partially in
elevation, showing a front-end jack adapter for the flashlight;
FIG. 5 is a vertical sectional and elevational view showing a
storage compartment for the plug-in extension; and
FIG. 6 is an elevational view of a probe light adapter for use with
the flashlight extension.
On reference to FIG. 1, a flashlight assembly 10 carries a jack 11
adapted to receive operatively a plug-in lamp-carrying extension
12. In the form shown, the flashlight assembly 10 comprises an
elongated tubular handle casing 13 providing therein a battery
chamber 14 having therein one or more, and in this instance two,
batteries 15 in tandem with their front-end poles connected in an
electrical circuit through a lamp 17 the socket of which is mounted
in a metallic reflector 18 which has a lens 19 across the front
thereof and is insulated from the casing 13. Connection of the
reflector 18 in an electrical circuit with the casing 13 is through
a leaf spring conductor 19a which is mounted in insulated relation
on the inside of the casing adjacent to an electrical switch device
20 including a reciprocal digitally operable actuator 21 operating
a contact which is free from a contact 23 of the conductor 19a in
the open switch position and is in electrical engagement with such
contact in the closed switch position. In addition, the contact 22
may be a leaf spring which is adapted to be moved into electrical
engagement with the contact 23 by a switch button 24.
Instead of the opposite poles of the batteries 15 being connected
in the flashlight-operating circuit by means of an electrically
conductive conical coiled compression spring 25 thrusting the
batteries toward the base of the lamp 17 by seating within a
metallic cap 27 screwed onto the back end portion of the casing 13
as is conventional, the spring 25 is insulated from the casing as
by means of a piece of tubular insulation 28 into which the outer
endmost or large coil of the spring is threaded so that it is
thoroughly insulated from an annular thrust shoulder 29 on the cap
27. Electrical connection between the spring 25 and the casing is
effected through the jack 11 which for this purpose is mounted in
insulated relation on the end wall provided by the cap 27 and has a
terminal 30 which is electrically connected to the spring 25 as by
means of a lead 31, and a terminal 32 which is electrically
connected as by means of a lead 33 to the electrically conductive
cap 27 which by its threaded connection is electrically connected
to the casing 13. Normally the terminals 30 and 32 are electrically
connected together by means of separable contacts 34 and 35. With
the contacts 34 and 35 in electrical engagement, closing of the
switch 20 functions to close the electrical circuit through the
lamp 17 to illuminate the same for normal flashlight operation. For
such normal operation, the extension 12 will not have been
connected to the jack 11.
When it is desired to employ the extension 12, a plug structure 37
at one end of the extension is manipulated through a handlelike
base 38 to insert a single-prong, double-pole plug 39 into a
receptacle bore 40 axially through the jack. This causes the rear
end pole portion of the plug to make electrical contact with the
battery casing through the connector 32 and the cap 27 to the
battery casing. At the same time a front-end tip pole 41 on the
plug engages a terminal head 42 on the contact 35 and springs this
contact away from the contact 34 to break the connection between
the terminals 30 and 33 and connect the terminal 30 with the plug
head 41 through the terminal 35. Thereby, respective electrical
leads extending from the plug structure 37 are connected into the
electrical circuit of the flashlight and electrically connect a
lamp bulb 44 removably secured in a socket 45 at the opposite end
of the extension 12 into the flashlight circuit. As a result, when
the switch 20 is actuated from the open circuit to the close
circuit position, the extension lamp 44 is illuminated instead of
the front-end flashlight lamp 17. Hence, by plugging in the
extension 12, the lamp 44 illuminates alternatively to the lamp 17
by operation of the switch, but when it is desired to employ the
front-end lamp 17, the extension must be unplugged.
In FIGS. 2 and 3 another manner of connecting the jack
disconnectably in the flashlight circuit is disclosed. In this
instance the jack is identified as 11' and is secured to the end
wall provided by the screw-on cap 27' which is adapted to be
screwed onto the rear end portion of the flashlight casing 13'
within the chamber of which the battery 15' is thrust forwardly by
the spring 25' seating against a generally cup-shaped insulator 47
with the base coil of the spring thrusting in electrical contact
against the contact 30' of the jack which is extended radially for
interposition between the insulator and the spring. Electrical
contact with the flashlight casing is effected by turning the
contact element 32' into clamped electrical engagement against the
cap member 27'. Otherwise the jack 11' is the same as and functions
the same as the jack 11 in FIG. 1, namely, electrical connection to
enable lighting of the front-end bulb by operation of the
flashlight switch when the contacts 34' and 35' are in electrical
engagement as shown in full line in FIG. 3, while electrical
connection with the extension is effected when the plug 39 is
inserted into the jack and the plug head 41 separates the contacts
34' and 35' by thrusting laterally against the contact terminal 42'
as shown in dash outline.
Where preferred, the arrangement of FIG. 4 may be employed wherein
a jack 48 replaces the customary lamp bulb, desirably as an
optional alternate. To this end, the jack 48 comprises an
electrically conducting socket body sleeve 49 into which the plug
39 of the extension plug structure 37 is adapted to engage, and
which is of a length such that the shank pole of the plug is
adapted to engage in electrically contacting relation therewithin
while the head or tip pole 41 makes electrical contact with a
contact structure desirably in the form of a coiled compression
spring 50 thrusting at one end against or at least being
electrically connected to a nib terminal 51 at the inner end of the
jack and which makes electrical contact with the front-end pole of
the contiguous battery. To adapt the jack 48 to assume the same
position as a flashlight bulb or lamp, the contact nib 51 is
supported by a shouldered generally cup-shaped holder 52 of
dielectric material which is engaged by a flanged retaining ferrule
53 desirably of metal and which is engaged at its outer end about
the inner end portion of the socket body 49 to which it is attached
by means of crimping or the like. To provide a stop shoulder for
the outer end of the spring 49, an insulating washer 54 is secured
between the contiguous ends of the retainer 52 and the body 49. To
enable operative mounting of the jack 48 in the manner of a
flashlight bulb, the outer end of the ferrule 53 is provided with
an annular radial flange 55 which is engaged in electrical contact
with an annular shoulder 57 which faces inwardly at the connection
of a threaded socket 58 with the reflector 18, whereby a
dielectric, such as a hard plastic thrust sleeve member, threadedly
engaged within the socket 58 secures the flange 55 against the
shoulder 57 and thereby retains the jack 48 in place on the
reflector bowl. In this instance the usual glass or plastic lens is
omitted and the outer end of the electrically conductive reflector
bowl 18 is electrically isolated by a dielectric insulator 60 from
the customary flange shoulder provided by a securing ring 61
threadedly engaged with the dielectric casing 13, with the leaf
spring conductor 19a engaging the reflector bowl 18 and leading to
the flashlight switch in the customary manner. Through this
arrangement, plugging in of the plug assembly 37 effects connection
of the extension leads 43 with the battery through the spring 50
and with one pole of the switch through the body socket member 49.
When it is desired to replace the conventional flashlight lamp, the
jack 48 can be readily removed by unscrewing the thrust member 59
and inserting the lamp in place of the jack.
Means for conveniently storing the plug-in extension 12 may take
the form of a container 62 (FIG. 5) comprising a generally
cup-shaped body of electrically conductive material such as
aluminum provided with a slip-on closure cap 63 also of dielectric
material and provided with a central projection 64 simulating the
projecting central pole of a battery. By having the container 62
and its cap of a diameter substantially similar to the diameter of
the battery 15 and provided with an insulating sleeve 64 about the
body of the container, and the overall length of the closed
container about the same as that of the battery, the container can
be mounted within the battery chamber 14 of the battery casing 13
as a replacement for one of the batteries 15. On the other hand,
the length of the flashlight body housing or casing 13 may be
increased sufficiently to accommodate the container 62 in tandem
relation to a pair of the batteries 15. This arrangement assures
that the plug-in extension will at all times be with the flashlight
when the extension is not in use and keeps it ready at hand for use
when needed.
For purposes such as inspection within small-diameter workpiece
bores in machine stops, or in tool and die shops, or elsewhere
where it is necessary or desirable to provide illumination within a
small opening or cramped area into which it would be inconvenient
to introduce a flexible extension cord such as provided by the
leads 43, a rodlike probe extension 65 (FIG. 6) may be provided
having a screw-in base 67 at one end adapted to be operatively
received within the lamp sockets 45, and carrying at the opposite
end of the tubular probe rod a small electrical lamp 68 such as a
wheat bulb which is electrically connected through the tubular rod
65 and the base 67 with the leads 43 of the plug-in extension.
It will be appreciated that the plug-in extension device of the
present invention provides a convenient flexible extension with a
cord of whatever desired length which will provide battery-powered
illumination for conditions where a battery itself may be too
bulky, heavy, unwieldy, or the like, to provide a convenient source
of illumination from its customary front-end lamp. For example,
where the lamp of the plug-in extension may be hung from a
convenient support, extended into a cavity or space wherein
illumination is desired, the battery casing can be laid on a
supporting surface or attached to a stationary support while the
extension cord can be freely maneuvered within the limits of its
length to provide a convenient illumination source under the
particular circumstances in which it is used.
It will be understood that variations and modifications may be
effected without departing from the spirit and scope of the novel
concepts of this invention.
* * * * *