U.S. patent number 3,767,904 [Application Number 05/255,031] was granted by the patent office on 1973-10-23 for impact resistant fluorescent lantern.
This patent grant is currently assigned to Solid State Products, Inc.. Invention is credited to Gary L. Cook.
United States Patent |
3,767,904 |
Cook |
October 23, 1973 |
IMPACT RESISTANT FLUORESCENT LANTERN
Abstract
An impact resistant fluorescent lantern with a light
transmitting shade positioned on a supporting base, the shade
confronting a multiplicity of thin, flexible, rectangular,
reflective panels therein which act as a deformable impact
absorbing medium to resist breakage of fluorescent electric bulbs
operatively mounted on the panels. Each panel is in a flexed
condition extending arcuately between a pair of clips, the clips
connecting the panel to adjacent panels and being in frictional
engagement with the interior side of the shade, the flexed panels
exerting a restoring force against the clips to urge the clips
against the shade. A cap is positioned on the shade and means are
provided to confine the shade and reflector between a cap and the
base.
Inventors: |
Cook; Gary L. (Bloomington,
MN) |
Assignee: |
Solid State Products, Inc.
(Minneapolis, MN)
|
Family
ID: |
22966548 |
Appl.
No.: |
05/255,031 |
Filed: |
May 19, 1972 |
Current U.S.
Class: |
362/184;
D26/41 |
Current CPC
Class: |
F21V
17/16 (20130101); F21S 9/022 (20130101); F21V
15/04 (20130101); F21L 4/00 (20130101); F21V
23/02 (20130101); F21V 7/005 (20130101); F21Y
2113/00 (20130101); F21Y 2103/00 (20130101) |
Current International
Class: |
H05B
33/02 (20060101); F21l 007/00 (); H05b
033/02 () |
Field of
Search: |
;240/11.2R,11.4R,51.11R,13R |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Greiner; Robert P.
Claims
What is claimed is:
1. An impact resistant fluorescent lantern for use with a source of
electrical power comprising:
a base;
a light transmitting shade on said base and having a hollow
interior disposed about a central axis;
a multiplicity of thin, rectangular reflective panels in said
hollow interior, each panel being flexible and adapted to move
toward and away from said central axis when the lantern is
subjected to impact, each panel having a pair of opposite edges
substantially equal in length to corresponding edges of the
remaining panels;
a multiplicity of panel retaining clips in frictional engagement
with the interior side of said shade, each panel being retained in
a predetermined position within said shade by a pair of said clips
with each clip joining an edge of one panel to a corresponding edge
of an adjacent panel, the panels and clips cooperating to form a
light reflector encircling said axis and located within the hollow
interior of said shade;
each of said panels being in a flexed condition between the clips
retaining it to form an arcuate surface extending between the clips
and to exert a restoring force on the retaining clips to urge said
clips against the interior side of said shade so as to hold the
clips in frictional engagement with the shade;
a multiplicity of electric fluorescent light bulbs, a bulb
operatively mounted on each of said flexible, movable panels, the
flexed, movable panel providing an impact absorbing medium to
preserve the integrity of said bulbs when the lantern is
jarred;
a cap positioned on said shade;
means joining said base to said cap to confine said shade and
reflector therebetween; and
means for operatively delivering electrical energy from the source
of electrical power to said fluorescent bulbs.
2. The combination according to claim 1 wherein said multiplicity
of panels is three panels and said panels are opaque and
substantially identical, the said panels having three reflecting
faces which divide said shade interior into three bulb
compartments.
Description
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to the field of portable battery
powered lanterns such as those used in camping and for emergency
lighting.
Until recently, the camping lantern field was occupied almost
exclusively by gasoline powered units utilizing mantles and a fine
spray of pressurized fuel. While these lanterns provided adequate
light, they had the attendent disadvantages of being dangerously
inflammable in a forest or tent environment, time consuming to
actuate, and difficult to handle due to the high temperatures
produced by the burning gasoline. Such lanterns produce an
unpleasant odor and are a source of pollution. In addition the
mantles are easily damaged if the lantern is jarred or dropped, and
such droppage can readily make the lantern inoperative and sometime
produce fire damage to the surrounding area.
Due to the recited disadvantages of gas lanterns, portable
electrical lanterns have increased in popularity as camping
lanterns, but until recently have been unable to produce a high
illumination level over a prolonged period with the limited
electrical energy stored in the battery. Recent improvements in
batteries and circuitry have made it feasible to utilize a
fluorescent light bulb in such lanterns with the accompanying
advantage of high illumination with greatly reduced power
requirements.
It is an object of the present invention to provide a novel camping
light construction which is relatively simple to assemble and
inexpensive to produce while simultaneously providing an impact
resistant structure to increase the operating life of the
fluorescent bulbs. The structure of the invention provides an
impact resistant electric fluorescent camping lantern which has
brilliant 360.degree. illumination while generating no polluting
odors or fire hazard.
The invention has a base containing electrical circuitry and
batteries, the base supporting a light transmitting shade which is
generally cylindrical with a hollow, circular cross section
interior. Within the shade interior is an impact resistant
reflector formed of three thin, flexible, rectangular, reflective
panels, each panel being flexed to provide an arcuate surface
extending between a pair of panel retaining clips. The flexed
panels exert a restoring force against the encircling shade
interior, causing the clips to be urged against the encircling
shade and thereby to retain the clips in frictional engagement with
the shade. A fluorescent bulb is operatively mounted on each panel.
In the event the lantern is jarred due to dropping or the like, the
flexible panels flex additionally to provide a deformable impact
absorbing medium to increase the operating life of the fluorescent
bulbs.
A cap is positioned on the shade, and means are provided to join
the cap to the base to confine the shade and reflector
therebetween.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a perspective view of the camping lantern invention.
FIG. 2 is an exploded view of the lantern showing the components
and drawn partially in phantom.
FIG. 3 is a cross sectional view of the lantern reflector taken
along cutting plane 3--3 of FIG. 1.
FIG. 4 is a bottom view of the lantern base of FIG. 1 taken from
the direction of arrows 4--4.
FIG. 5 is a side sectional view taken along cutting plane 5--5 of
FIG. 3.
FIG. 6 is a schematic electric circuit diagram of a portion of a
circuit usable with the invention.
DESCRIPTION AND OPERATION OF THE INVENTION
Referring now to FIGS. 1 and 2, the impact resistant fluorescent
lantern 10 is provided with a supporting base 12 on which a light
transmitting shade 14 is mounted, a cap 16 positioned on the shade.
A centrally located threaded post 18 is rigidly attached to the
base 12 by any appropriate means known to the art and is
perpendicular to the base top 20, extending upwardly through the
shade 14 and through bore 21 in cap 16, the cap being firmly
retained on the shade by means of aligning washer 22 and threaded
retainer 23 which engages threaded post 18. A short length of post
18 extends beyond the retainer 23 to permit a carrying handle 24 or
the like to be threaded thereto to permit the lantern 10 to be
easily carried or hung from an appropriate hanger.
The supporting base 12 is generally circular in cross section and
typically formed of metal or plastic as an integral unit. The base
is hollow and contans adequate space to accommodate the electrical
circuit components and batteries to be described hereafter. A
rotatable switch 25 projects through recessed wall 26 in the base
and is used to actuate the fluorescent bulbs as will be further
described hereafter. The recessed wall protects the switch 25 from
damage if the lantern falls or rolls. The base top 20 is provided
with a reflective white coating to assure high light reflection
therefrom.
The cap 16 is an integral unit with a lower surface 27 which is
positioned immediately above the shade 14 and provided with a white
reflective surface to increase light reflection downward.
It should be understood that although a single structural
embodiment of cap 16 and base 12 have been shown herein, the shape
and configuration of these components may be varied in ways known
to the art, all such variations being within the purview of the
claimed invention.
The post 18, which is securely mounted to the base 12, and the
retainer 23 provides a means for joining the base 12 to the cap 16
to confine the shade 14 and reflector 28 therebetween. It should be
understood that the shown means is merely illustrative and that
other means known to the art could as readily have been employed,
all such known means being within the pruview of the claimed
invention.
The light transmitting shade 14 may be either transparent or
translucent and may be formed of any appropriate material such as
plastic or glass, plastic being preferred because it is more
resistant to impact and breakage. The shown shade 14 is of circular
cross section and cylindrical in shape with its central axis being
generally centered on the post 18, the shade 14 being hollow with a
substantially circular cross section interior to receive and
confine the reflector 28.
The reflector 28 is formed of a multiplicity of thin, flexible,
rectangular, reflective panels 29,30 and 31, each panel such as
panel 29 having a pair of opposite edges 32 and 33 which are
substantially equal in length to corresponding edges of the
remaining panels such as edges 34 and 35 of panel 30, 36 and 37 of
panel 31.
Each of these panels is made of a thin but firm material, such as
opaque, white, sheet plastic, which is easily flexed but has great
resistance to breakage or cracking. Although plastic is used in the
present invention, other equivalent materials are within its
purview. Panel retaining clips 38, 39 and 40 interconnect the
panels 29, 30 and 31, a pair of the retaining clips being attached
to opposite edges of each panel. The clips may be made of any
appropriate material, plastic being preferred.
Referring now to FIG. 3, each of the panels such as panel 29 is
flexed or bent to form an arcuate surface extending from one clip
38 to an adjacent clip 39, the flexed panel exerting a restoring
force, outwardly directed through the clips and toward the shade
14, tending to urge the clips against the shade 14 to retain the
clips in frictional engagement with the inner surface of the shade
14. The retaining clips extend along the length of the
corresponding edges of each panel to assure a relatively firm
contact between the clips and the inner surface of the shade 14.
The remaining panels 30 and 31 are retained in a flexed condition
by clips 38, 39 and 40, all the panels being retained in a
predetermined position relative to one another wherein their
corresponding edges 32, 33, 34, 35, 36 and 37 are generally
parallel to the central axis of the shade. Accordingly the three
flexed panels 29, 30 and 31 cooperate with the clips 38, 39 and 40
to retain the reflector formed by panels and clips in frictional
engagement with the shade 14 and encircling the shade axis.
Each panel has a fluorescent bulb 41 mounted thereon by means of
bulb sockets 42 and 43 located at bottom and top, respectively of
each panel; the bulbs are typically 4, 6 or 8 watt units. FIG. 5
shows the mode of attachment of these sockets to each panel, the
socket 43 being attached to panel 29 by means of screw 44 passed
through the panel and into a bracket 45 on the socket 43.
Accordingly it is seen that each fluorescent bulb 41 is operatively
mounted to the reflector by means of sockets 42 and 43 at bottom
and top of each panel, the flexed condition of each panel providing
a deformable medium which can move inwardly or outwardly within the
approximate limits 46 and 47 shown in FIG. 3 when the lamp is
dropped or jarred. This inherent flexibility of the panels 29, 30
and 11 which comprise the reflector 28 assures that the fluorescent
bulbs 41 are not easily broken or damaged and that the bulb
operating life is not adversely affected.
It has been found desirable for each flexed panel to be curved
inwardly to provide a concave surface as viewed from its attached
fluorescent bulb 41, the retaining clips 38, 39 and 40 being
equally spaced about the inner periphery of the shade 14 to cause
the identical panels to form three substantially identical bulb
compartments 48, 49, and 50.
Although the lantern 10 has been shown as having three compartments
with three bulbs, it should be understood that a greater number of
compartments could as readily have been used by increasing the
number of panels forming the reflector 28. For example, four panels
with four retaining clips would have divided the shade interior
into four bulb compartments each of which could have been provided
with a fluorescent bulb.
Referring now to FIG. 4, the bottom 51 of the base 12 is provided
with a removable cover 52 which is held in place by tabs 53 and
screw 54. When it is desired to insert or replace the batteries 55
and 56 within the interior of the base 12, the screw 54 is
extracted and the cover 52, removed from its shown position to
expose an opening through which batteries 55 and 56 can be
inserted. Means for retaining the batteries in the shown position
of FIG. 2 are provided in the form of a battery frame 57.
Each lower bulb socket 42 has a separate wire 58 extending
therefrom and into central post 18. The wire 58 pass downward
through the post and into the base interior. A second wire 59
extends from each upper bulb socket 43, entering the post 18 and
extending therethrough into the base 12. The wires 58 and 59 from
each bulb connect to substantially identical actuating circuits 60
(FIGS. 2 and 6). Each circuit 60 has a capacitor 61 connected in
series with the bulb 41 and with the secondary winding 62 of
transformer 63.
The primary coil 64 of the transformer 63 is connected across the
output of inverter circuit 65, which is of a type known to the art.
The inverter circuit 65 converts the direct current of batteries 55
and 56 to alternating current used by the fluorescent tube 41.
The input of the inverter circuit is connected in series to the
on-off switch 25 which selectively connects the inverter circuit 65
to the batteries 55 and 56. The batteries are 6 volt batteries and
are connected in series to form a 12 volt power source. The switch
25 may alternatively be of a type which actuates all three
fluorescent bulbs simultaneously or may have a plurality of
positions so that one, two or all of the fluorescent bulbs are
simultaneously lighted.
Although only the circuit 60 has been shown in detail, it should be
understood that each of the additional fluorescent tubes on lamp 10
is provided with its own identical circuit 60 which is connected
between the switch 25 and bulbs 41 to provide electrical power to
the bulbs.
Since a 12 volt direct current source is used with the lantern 10,
it will be immediately recognized that the lantern is usable with
an automobile battery as its power source. If desired, the
batteries 55 and 56 may be of a rechargable nature and with
appropriate circuitry be recharged from standard house current or
directly from a 12 volt automobile electrical system.
The three circuits 60 and switch 25 collectively constitute a means
for operatively delivering electrical energy from the source of
electrical power, namely batteries 55 and 56, to the fluorescent
bulbs 41. Although a particular circuit 60 has been shown for use
with each fluorescent bulb, it should be understood that other
equivalent circuits known to the art may be readily substituted and
all such alternative circuits are within the purview of the claimed
invention.
In operation the operator moves the switch 25 to an on position
where one or more of the circuits 60 are connected to the
batteries. Current flows from the batteries to the inverter circuit
65 of each of the circuits 60, the inverter converting the direct
current from the batteries to an alternating current which in turn
is transformed by transformer 63 to a higher voltage suitable for
fluorescent bulbs 41. The capacitor 61 provides a smoother output
current to each fluorescent bulb.
The clips 38, 39 and 40 of reflector 28 are in frictional
engagement with the shade interior and during normal operation
retain the reflector in the position shown in FIG. 1, the panels
being flexed or bent to form a curved or arcuate surface on which
the bulbs 41 are mounted.
When the lantern 10 is dropped or jarred as is not unusual during
outdoor activity the jarring force causes the flexible panels 29,
30 and 31 to further bend and deform within the approximate limits
46 and 47 (FIG. 3), thereby absorbing the jarring force by the
panel deformation rather than fully transmitting the force to the
fluorescent bulbs 41. Naturally the flexed panels return to their
standard position after the jarring force has been absorbed and
dissipated.
Because the fluorescent bulbs require relatively little power to
produce a very considerable quantity of light, the battries are not
rapidly depleted. The positioning of the bulbs 41 at substantially
equally spaced intervals about the shade assures that full
360.degree. lighting is obtained, the light rays striking the
reflector 20 and being reflected outwardly. In addition the
reflectorized surfaces 20 and 27 of base and cap, respectively,
assure that little light is absorbed by these surfaces.
Because little heat is generated by the fluorescent bulbs 41, no
venting is needed, and it is possible to tightly seal shade 14
between cap 16 and base 12, thereby providing a relatively tight
flotation chamber within the shade. This chamber assures that the
lantern 10 will float for a considerable time interval if
inadvertently dropped into a body of water.
Since only a 12 volt power system is needed with the invention,
there is little danger of serious electical shock to a user and the
danger associated with inflammable fuels such as gasoline is
avoided, providing a highly reliable, safe, and impact resistant
lantern which is easily and inexpensively manufactured.
While the preferred embodiments of the present invention have been
described, it should be understood that various changes,
adaptations and modifications may be made therein without departing
from the spirit of the invention and the scope of the appended
claims.
* * * * *