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Патент USA US2121260

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June 2l, 1938.
I
P_ D', PH|LL|P$
-
2,121,260 .
LIGHTING coNsTRUcTIòN
Filed Jan. 30. 193s
muil uw
2,121,260
Patented June 21, 1938
?UNITED STATES PATENT OFFICE
2,121,260
LIGHTING CONSTRUCTION
Paul D. Phillips, Elmhurst, Ill., assigner to Ben
jamin Electric Mfg. Company, Des Plaines, Ill.,
` a corporation of Illinois
`Application January 30, 1936, Serial No. 61,445
ì 1 claim.
(Cl. 240-143)
My invention relates to a lighting construc
tion.
In my prior patent, No. 1,834,318,`dated Decem
ber 1, 1931, is shown a construction in which a re
flector carrying a lamp socket can be connected
5 and disconnected with respect to a wiring base by
vmeans of a bayonet joint connection, In this con
struction, the connecting and disconnecting move
ment requires that the Wiring base be forced in
wardly against a substantial spring pressure to
release it from latching engagement. Under some
conditions,it is somewhat difficult to eiïect this in-ward movement of the wiring base against spring
pressure, particularly in the pendant type of i'lx
ture in which the hood carrying the wiring `base
15 may be supported by a chain. This makes a non
rigid support for the wiring base, making it nec
essary for anyone disconnecting the ñxture to
hold the upper element, including the hood and
wiring base, with one hand while at the same
2 time holding the reñector carrying the socket
with the other hand and pressing it upwardly
to compress the wiring base against its spring.
One of the objects of my invention ‘is to provide
an improvement in this type of fixture in which
‘25 a latch member is provided to lock the bayonet
` joint in connected position, which latch, when re
leased, will enable the parts to be disconnected
so
by simply rotating the reflector carrying its sock
et with respect to the hood carrying its wiring
base.
A further object of my invention is to provide
such a latch which may be easily released by the
hand holding the hood.
Further objects and advantages of the inven
tion will be apparent from the description and
claim.
In the drawing, in which an embodiment of my
invention is shown,
Figure 1 is an axial section;
Fig. 2 is a section on the line 2-2 of Fig
ure 1;
Fig. 3 is a side elevation of the hood and latch,
parts being broken away;
Fig. 4 is a side view of the neck of the reflector
45
with the bayonet joint member;
Fig. 5 is a side elevational view of _the hood with
a part broken away to show a bayonet joint lug;
and
Fig. 6 is a bottom view of the wiring base.
50
Referring to the drawing in detail, the lighting
construction s_hown comprises a hood I Which
may be supported in any suitable manner as by
a stem or chains, a wiring base 2 in, and carried
55 by, said hood having contacts 3 and 4 thereon for
engaging corresponding contacts 5 and 6 on the
lamp socket 'I and having a bayonet joint con
nection with the hood, a reflector member having
an upper neck portion 8 and having a bayonet
joint member 9 for connection with a bayonet
joint formation on the hood, the lamp socket 1
mounted on and carried by the reflector having
the contacts 5 and Ii for engaging the contacts 3
and 4 on the wiring base, and latching means for
holding the reñector against rotation when in
connected position with respect to the hood, said 10
latching means comprising a spring-pressed
plunger I0 having a laterally extending arm II
engageable by the hand holding the hood for re--
leasing the plunger.
The bayonet joint connection between the wir- ,
ing base 2 and hood I may be substantially as
shown in my Patent No. 1,834,318, the hood being
provided with a number of inwardly extending
lugs I2 and the insulating wiring base being pro
vided with a plurality of L-shaped recesses I3 in
its sides for cooperation with the lugs I2 on the
hood. A coil compression spring I4 is provided,
acting between the hood and wiring base, to hold
the wiring base against rotation when in con
nected position. When in connected position, the
lugs I2 on the hood lie in the pockets I5 in the
0
5
L-shaped recess so that the wiring base must be
forced upwardly before it can be rotated for re
leasing it from the hood.
The bayonet joint connection between the
neck of the reflector and the hood may also be
substantially as shown in my previous Patent No.
1,834,318 comprising a plurality of lugs I6 ex
tending inwardly from the skirt of the hood 35
and the sheet metal connector member 9 se
cured to the flange I'I of the reflector having a
plurality of upwardly bent portions, three of
which are provided with outwardly extending
flange portions I8 for engagement with the in
wardly extending lugs I6 on the hood. Each of
these outwardly extending flanges, as shown in
Fig. 4, is provided with a sloping portion I9
which enables the flange to ride easily over the
corresponding lug I6 on the hood, exerting a
cam action whereby the wiring base 2 may be
easily forced inwardly against its spring I4 in
making the connection. Each flange is also pro
vided with an offset raised portion 20 so that
when the reflector“ has been rotated to bring this 50
raised portion above an inwardly extending lug
I6 on the hood, the spring I4 will press the wir
ing base, and consequently the reflector mem
ber, downwardly. There is a slightly inclined
shoulder portion 2I (Fig. 4) between the in 55
2
2,121,260
clined cam portion I9 and the raised portion 2i!
of the flange, which inclined shoulder portion
tends to resist disconnecting movement of the
reflector. In my previous patent, this shoulder
tor, the plunger I0 is pushed upwardly by the en
gagement of one of the outwardly extending
flange portions I8 with the head of the plunger.
The reflector is then given a turning movement,
was made abrupt so that it could not ride over
the flange portions I8 riding along above the
the inwardly projecting lug in the disconnect
ing operation, thus necessitating forcibly press
ing the reflector upwardly before rotating the
reflector to disconnect it. As pointed out above,
10 however, this had disadvantages, particularly in
lugs on the hood, forcing the Wiring base 2 in
wardly by ca_m action. The reflector is turned
the pendant type of fixture. In order to make
the disconnection easy and still »insure against
accidental disconnection, I have provided the
spring pressed plunger I0 Which acts as a latch
15 when the reflector is in connected position by
snapping 01T from the raised portion 2|] of the
flange onto one of the three shoulders-22 pro
vided on an adjacent upwardly extending por
tion 23 of the connector member 9. This latch
20 will :prevent any accidental rotation of4 the re
flector member with respect 'to> the hood. How
ever, this latch .member can be easily lifted
against the slight tension of- the latch spring
2li and thereafter the reflector can be discon
25 nected simply by giving it a slight rotation, the
inclination of the shoulder portion 2I Vbeing so
slight that the reflector can be rotated with re
35
spect to the hood Without pressing upwardly on
the reflector, the inclined shoulder acting as a
cam to raise the reflector slightly.v
As shown in Fig. 5, the Vuppersurface of each
of the lugs I6 may -be rounded» off for coopera
tion with the flange' portions I8 so that these
flange portions can ride over the-lugs I6 easily,
even if abrupt shoulders` are providedin the
flanges as disclosed in my -Patent No. 1,834,318
instead of the inclined shoulders 2l shown in
this` application.
As shown in Fig. 6, the >Wiring base is provided
with suitable wiring terminals y25 and 26, the
wiring terminal `Z'Ilbeing electrically connected
with _the spring contact ñngersß, and the other
wiring terminal .2G ybeing electrically connected
with the spring contact lingers 4.
In connecting the reflector with respect to
the hood, the reflector is turnedso that the
flanges I8 will be out of alignment with the lugs
I6 on the hood and the reflectorA is then pushed
up to bring the entering edges of the.' flanges
above the inwardly extending lugs I6 on .the
hood. In this` upward movement of the. reflec
until the little shoulders 2I on the flange are
past the lugs' I6, allowing the raised portions
`2l! of the flanges to rest on the lugs. When 10
turned to this position, one of the shoulder por
tions`22 is brought underneath the head of the
plunger and the plunger snaps off from the lat
erally extending flange 20 onto the shoulder 22,
15
thus holding the reflector against rotation.
Further modifications will be apparent to
those skilled in the art and it is desired, there
fore, that the invention be limited only by the
prior art and thescope of the appended claim.
Having thus described my invention, what I 20
claim and desire to secure by Letters Patent is:
A lighting construction comprising a hood, a
Wiring base in and carried by said hood having
contacts thereon, a reflector member, a lamp
socket carried thereby having contacts for en 25
gaging the contacts on the wiring base, bayonet
joint means whereby the reflector carrying the
socket may be connected and disconnected with
respect to the hood and wiring base by rotation
about the axis of the reñector, spring means act 30
ing on the Wiring base to hold its contacts in
engagement with the contacts on the lamp
socket, said bayonet joint connection having a
cam engagement with the hood which in co
operation with the spring causes an in-and-out 35
movement of the Wiring base both on the con
necting and disconnecting movement, and spring
latching ,means for positively holding the bayo
net joint in connected position accessible for re
leasing operation from the exterior of the hood, 40
said hood having a guideway in its side wall
extending longitudinally-of the axis of the hood,
said latching means comprising a` plunger slid
ably mounted in said guideway, said plunger be
ing provided with a lateral `projection adjacent 45
the upper end of the hood whereby _the plunger
may be held in raised position by the hand grip
ping the hood and disconnecting the reflector
from the hood.
PAUL D. PHILLIPS.
50
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