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Патент USA US3087064

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April 23, 1963
P. A. JONES
3,087,054
PROTECTIVE CAGE CONSTRUCTION FOR LIGHT FIXTURES
Filed Oct. lo, 1960
PRES TON ,4. JONES
United States Patent O
3,6%?,054
1
1
Patented Apr. 23,l l 963
2
3,037,054
PRÜTECTÍVE CAGE CONSTRUCTÍÜN FOR
MGI-1T FIXTURES
Preston A. Jones, ‘San Rafael, Calif., assigner of one-hail?
to Wallace D. Runswick, Berkeley, Caiif.
Filed Oct. 1t), 1960, Ser. No. 61,606
4 Claims. (Cl. 2410-102)
This invention relates' to light fixtures of the type in
which the globe is `disposed Iwithin a protective cage struc
ture, and is particularly directed to an improved light fix
ture cage construction which is arranged for ready open
ing to permit removal of the globe from the fixture.
In light fixtures which are intended for outdoor light
ing or for industrial application it is usually `desirable that 15
the globe of the fixture be enclosed within a protective
cage structure to lessen the susceptibility of the globe to
breakage. The cage must be arranged to permit access
to the globe such that it may be removed from the fix
form of an elongated tapered cylinder having an external
ly threaded neck 19 projecting from its enlarged end for
engagement with the receptacle threads 18. The globe
may hence be screwed into the receptacle to removably
secure the globe to the fixture.
A light -bulb socket 21 is mounted on the base of the
receptacle and its input conductors are led through a con
duit 22 which extends through the suspension member 16
and into the open back of the base member 14. A light
bulb (not shown) mounted in the socket 21 is hence con
centrically enclosed within the globe 12 when the globe
is engaged Vwithin the receptacle and access to the bulb
for replacement .is facilitated by unscrewing the globe.
However, the globe is enclosed within the protective cage
structure 13 which is secured to the face of the base
member 14. Therefore, in order to unscrew the globe in
yorder to gain access to the light bulb, the enclosed globe
must first be rendered accessible.
Heretofore it has been necessary to remove the entire
ture for purposes of light bulb replacement and the like. 20 protective cage structure from about the globe of the
Heretofore, it has been necessary to remove the cage
fixture in order to render the globe accessible. This has
in order to gain access to the globe, hence amounting to a
been of course disadvantageous from the standpoint of
substantial disassembly of the fixture. Hence the mere
convenience as well as the time involved. To overcome
replacement of a light bulb in such a fixture -has been a
this difliculty in the present fixture 11, I have arranged
tedious «and time consuming operation.
25 the cage structure y13 for selective opening without re
lt is therefore `an object of the present invention to
provide an improved light fixture protective cage con
struction that facilitates ready access to the globe while
quirement of removal from the fixture so as to facilitate
access to the globe in a highly expeditious manner. More
explicity I have provided a cage structure of articulate
remaining in assembly with the fixture.
construction which includes opposed semi~cylindrical
Another object of the invention is the provision of a 30 latticed side segments 23, y24» pivotally secured to an in
light fixture cage structure of pivotally articulate construc
terconnecting circular latticed base segment 26. One side
tion such that it may be readily opened to afford access
to a globe enclosed therein.
*It is a further object of the invention to provide
a cage structure of the class described that is readily de
segment 23 is secured by fastening means 27 to the face
of base member 14 in partial enclosing relation to the
globe 12. The base segment 26 and other side segment 24
may hence be pivoted upwardly into respectively end
closing relation and partial enclosing relation to the globe,
the pivotal side segment 24 being then opposed to the
tachable from the fixture.
The invention possesses other objects and features of
advantage, some of which, with the foregoing, lwill be set
fixed segment 23 to form a closed cylindrical cage 4about
»forth in the following description of the preferred form
the periphery of the globe and closed at the lower end by
of the invention which is illustrated in the drawing ac 40 the base segment 26 (see FIGUR-E '1). Upon downward
companying and forming part of the specification. It
pivoting of the segments 24 and 26 relative to segment 23,
the cage `is hence opened over one-half of its cylindrical
is to be understood, however, that variations in the show
ing made by the said drawing and description may be
periphery and at its lower end to afford access to the globe
adopted within the scope of the invention as set forth in
(see FIGURE 2).
45
the claims.
Considering now the articulate cage structure as to
FIGURE 1 is a front elevational view of a light fix
preferred construction it is to be noted that each of the
ture embodying the protective cage structure of the inven
side segments 213, Z4 includes a semi-circular collar 28
tion.
adapted to engage the periphery of the globe receptacle
FIGURE 2 is a sectional view taken at line 2_2 of
17 at its lower end with the collar being in end abutment
FIGURE 1 and depicting the cage structure in open con 50 with the rim of the globe when it is engaged in the
dition to facilitate access to the glob-e.
receptacle. A pair of longitudinal struts 29, 31 then
depend downwardly from the collar on opposite sides of
FIGURE 3 is a sectional View taken at line 3_3 of
FIGURE 1 and illustrating particularly the manner in
its arcuate center, the Istruts being curved slightly outward
which the cage is »detachably connected to the fixture.
from the collar at their upper ends in order to clear the
FIGURE 4 is a sectional view taken at line 4_4 of 55 peripheral surface of the globe. Similarly, a pair of
diametrically opposed longitudinal `struts 32, 33 depend
FIGURE l and illustra-ting particularly the pivotal con
downwardly from the opposite ends of the collar in like
nection between several segments of the cage structure.
Referring now to the drawing, particularly FIGURES
«fashion as the struts 29, 31. The longitudinal struts 29,
l ‘and 2 thereof, there is seen to be provided a light fix
31 and 32, -33 are then interconnected by a plurality of
ture 11 which is primarily intended for outdoor use, and 60 longitudinally spaced semi-circular bands 34, the lower
is of the type having a light diffusing globe 12 enclosed
one 34’ of which interconnects the lower ends of the struts
and is disposed so as to be substantially circumjacent the
within a protective cage structure 13. The fixture in
cludes a vertically disposed base member 14, preferably
of open backed rectangular box construction. A ‘hollow
lower end lof the globe. The like side segments 23, 24
may hence be placed in opposition with their respective
globe suspension member 16 of rectangular cross-section 65 struts 32, 33 in abutment to form a cylindrical con
projects normally lfrom the upper end «of the base mem
ber and carries a globe receptacle 17 at its outer end for
figuration. In order that the abutments of these struts
mounting the globe 12 in substantially parallel position
struts are preferably provided with detents 35 arranged to
engage registering recesses 36 in the opposite struts with
relative to the base member.
EMore specifically, the re
of the respective `segments be extremely intimate, the
ceptacle is of inverted cylindrical cup configuration and 70 which they abut.
is internally threaded as indicated at 18 for threadably
receiving the globe. The globe is in turn provided in the
The base segment `26 ‘is provided in a somewhat
analogous manner to the side segments 23, 24. More
acerbes
3
box member. The flange and box, moreover, are dimen
specifically, a plurality of concentric rings 37 are inter
sioned such that the flange fits through the interstice be
tween the parallel spaced struts 28, 31 of side segment 23,
the sides of the ñange contacting the facing sides of the
connected by U-struts 3S, 39 which extend across and are
aliixed to the rings, each strut having opposed inwardly
turned ends 4.1 and 42 aligned with the longitudinal struts
struts.
29 and 31 respectively of the two side segments. In addi
In addition, the flange is provided with laterally
projecting side wings 69 at its outer end yfor engaging
the distal sides of the struts relative to the ‘base member
in right angular relation to the struts 3S, 39, the up
1d». With the clamp member 64 extended through the
wardly turned ends of the strut 46 being adapted to abut
interstice ‘between the struts Iand into the box 'member
the semi-circular lower bands 34’ of the respective side
segments in alignment with the struts 32 and 34 thereof. 10 63, a rigid connection is afforded by a bolt 71 extended
through the closed ends of the members and the front wall
As regards the details of the pivotal connections be
of the base member 14 into threaded engagement with a
tween the side segments and base segment, it is to be
nut 72 at the open inner end thereof. The struts are thus
noted that a pair of pivots 47 are provided between the
rigidly engaged between the front edges of the box member
lower ends of s-truts 29, 31 of side segment 23 and the
and the wings of the clamping member thereby supporting
ends 4 of base segment U-str-uts 3S, 39. Similarly, a. pair
the entire cage structure. To remove the cage structure
of pivots 5.1; are provided between the lower ends of struts
it «is only necessary to disengage the nut 72 yfrom the bolt
29, 3-1 of the other side segment 24 and the ends 42 of the
71.
U-struts 38, 39. The pivots 47 are similar to the pivots
There is thus provided by the present invention a caged
5:1, one of which is shown in detail in FIGURE 4 and
light iixture in which the protective cage structure is con
accordingly the ensuing description of pivot 51 likewise
structed in a unique pivotally articulate manner such that
applies to the other pivots. The pivot 5I is preferably
the cage may be readily opened to aiford access to the
provided by means of an inverted U-shaped journal box
globe enclosed therein. The globe may hence be removed
52 which is secured to the side section strut 31 at its point
from the iixture without requirement of prior removal of
of intersection with the lower band 34'. The opposite
interior sides of the box are provided with projections 53 25 the cage.
What is claimed is:
at their upper inner corners, the projections having an
1. In a light iixture having a bulb enclosing globe
arcuate lower surface 54 extending substantially 90° and
secured to supporting base structure, the combination
defining a bearing surface. An axle pin 56 then projects
tion a parallel cross U-strut 46 extends across the rings 37
from one side of the box in concentric relation to the
corresponding bearing surface v54,. The upstanding end
42 of the base segment U-strut 39 is formed with cylindri
cal bearing hubs 57 on its opposite sides arranged to en
gage the respective bearing surfaces 54» and abut the
opposite sides of the journal box. One hub includes
a central aperture 58 for receiving the axle pin 56, and
in order that the aperture may be readily engaged on the
30
comprising a pair of opposed semi-cylindrical latticed
cage segments disposed about the periphery of said globe,
one of said segments -secured to said base structure, a
circular latt-iced base segment disposed in closing rela
tion to the end of the cylinder defined by said opposed
semi-cylindrical segments ’adjacent the closed end of said
globe, said base segment pivotally connected at opposed
positions respectively to said semi-cylindrical segments,
and means for releasably securing said semi-cylindrical
segments together in opposed relationship.
d2 which extends downwardly from the aperture and
2. In a light fixture of the type having a cylindrical
opens `at the front edge of the strut end. With the hubs
57 engaging the bearing surfaces of the journal box and 40 socket carried by sup-porting base structure and receiving
a cylindrical globe, the combination comprising a pair of
the pin engaged by `the slotted aperture, a pivotal con
semi-cylindrical latticed cage segments disposed in facing
nection is hence provided which permits movement of the
abutment to define ‘a cylindrical cage peripherally disposed
pivoted members through an arc exceeding 90°.
about the globe, each of said segments having a semi
In order that the pivotal segments y23, 24, 26 be releas
circular collar adapted to enga-ge the periphery of said
ably retained in a closed condition defining a cylindrical
socket with longitudinal struts extending at least from the
cage enclosing the globe 12, appropriate fastening means
opposite ends of the collar 'and from positions spaced on
are provided to detachably secure the opposed side seg
opposite sides of its arcuate center to a semi-circular end
ments together. To this end, the struts ‘32, 33 of the
band disposed about the end of the globe, each of said
side segment 23 are respectively provided with tapped
bores 61 at their upper ends in spaced relation to the 50 segments further having semi-circular intermediate bands
connecting said «struts at positions intermediate the collar
collar 2S. Such tapped bores receive screws 62 which
and end band, said segments having the struts at the ends
extend through bores in the corresponding struts of the
of their respective collars in facing abutment, fastening
opposed segment 24 at positions of registry with the bores
means securing one of said segments to said supporting
6l. Accordingly, the screws may be engaged in the bores
to secure the cage segments in closed cylindrical condi 55 base structure, a latticed base segment disposed in closing
relation to the ends of said segments adjacent the end of
tion enclosing the globe. Upon merely disengaging the
said globe, said base segment having a plurality of con
screws, the side segment 24 and base segment 26 are hence
centric rings interconnected by U-struts with their ends in
freed for pivoting to their open positions thus facilitating
abutment with the end bands of said semi-cylindrical
access to the globe.
Considering now the fastening means 27 for securing 60 segments, a pair of said U-struts being disposedwith their
opposite ends aligned with the struts of the respective
the cage segment 23 to base member 14, it will be appreci
semi-cylindrical segments at said positions spaced on op
ated that such means should be capable of rigidly sup
posite sides of the «arcuate centers of their collars, pivot
porting the entire cage structure and yet be readily de
means connecting the ends of said pair of U-struts to
tachable from the base member to ‘facilitate removal of
the cage structure `for purposes of repair and the like. 65 said struts of the semi-cylindrical segments aligned there
with, and means for releasably securing said semi-cylindri
To these ends the fastening preferably includes a rectangu
cal segments together in facing abutment.
lar «box member 63 projecting from the front face of the
3. The combination o-f claim 2, further defined by said
base member 14 and having an open front for receiving
pivot means each comprising a U-shaped journal bracket
a clamp member 64. The clamp member includes a hol
low cylindrical body 66 closed at its inner end and having 70 secured to one of said struts of said semi-cylindrical seg
ments at its intersection with said end band, said bracket
a diameter substantially equal to the transverse spacing be
pin, a slot 59 is provided in the side face of the strut end
tween the sides of box member 63. At the outer end of
having a corner projection on each of its interior side faces
-the clamp body 66 there is provided an outwardly iiared
.rectangular iiange 67 which has its edges inwardly turned
.as indicated at 68 for _engagement with the sides of the
with an arcuate inner bearing surface extending through
90°, one of said interior side faces having an axle pin
projecting therefrom in concentric relation to 'the cor~
3,087,054
5
6
responding bearing surface, and a pair of hubs formed on
opposite sides of the end of the corresponding U-strut in
engagement with said bearing surfaces, one of said hubs
having a central aperture engaging said pin.
4. A light -ñxture comprising a vertical base member
through the interstice between said struts of one of said
segments and engaging ythe facing sides of the struts, said
'flange having laterally projecting side wings `at its end
engaging the distal sides of said struts relative to said box
member, a »bolt extending through the closed ends of
said clamp member and said box member and through
the face of said base member, a nut threadably engaging
the end of said bolt, a circular latticed base segment d-is
posed in closing relation to the lower ends of said semi
cylindrical segments `adjacent the lower end of said globe,
said base segment pivotally connected to said semi-cylin
having a horizontal suspension element projecting from
`one end, a cylindrical globe receptacle depending from
the end of said suspension element, ya cylindrical globe
removably secured within said receptacle, a light bulb
socket secured in said receptacle for mounting a light bulb
within sai-d receptacle, a light bulb socket secured in
said receptacle `for mounting a light bulb within said globe,
a pair of latticed semi-cylindrical cage segments disposed
in facing »abutment to deñne a cylindrical cage periph
erally enclosing said globe, each of said segments having
a pair of parallel longitudinal struts spaced on opposite
drical ysegments at the struts thereof, and means for releas
Iably securing said semi-cylindrical segments together in
facing abutment.
15
sides of the arcuate center of the segment, a -boX mem
ber disposed adjacent the face of said base member and
having an open end, -fa hollow cylindrical clamp member
having a closed end disposed within said box member 2()
and a rectangular il-ange at its opposite end with inwardly
turned side edges engaging the interior -side faces of said
box member ladjacent its open end, said flange extending
References Cited in the ñle of this patent
UNITED STATES PATENTS
699,817
797,872
2,259,237
2,291,906
2,376,316
Russell _______________ __. May 13,
Spencer ______________ __ Aug. 22,
Baker et al ____________ __ Oct. 1,14,
Kollath _______________ __ Aug. 4,
Schwartz _____________ _.. May 15,
1902
1905
1941
1942
1945
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