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Патент USA US2113138

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April 5, 1938.
I
' H_ c_ HEALEY
LOCKING DEVICE FOR ELECTRIC LIGHT BULBS
Filed June 1, 1936
2,113,138
Patented Apr. 5, 1938
2,113,138
UNITED STATES
PATENT OFFICE
2,113,138
LOCKING DEVICE FOR ELECTRIC LIGHT
BULBS
Herbert o. Healcy, East Bridgcwatcr, Mass.
Application June I, 1936, Serial No. 82,733
8 Claims. (Cl. 173-356)
a washer 30 which bears on an insulating disk
This invention relates to a‘ device for prevent
ing the unauthorized removal of electric light
3I. The rod 24 extends through a tube or jacket
bulbs from sockets in which they are inserted.
It is an object of the invention to provide a
5 device such that the socket element, into which
the lamp base is screwed, will normally turn
freely with the bulb so as to prevent the un
32 of insulating material and is preferably freely
screwing of the light bulb therefrom. Accord
ing to the invention, a clutch device is pro
10 vided by which the socket element can be tem
porarily held against rotation for the insertion or
removal of an electric light-bulb, a special kind
of electromagnet being required for the opera
tion of such clutch device.
15
For a more complete understanding of the
invention, reference may be had to the disclosure
of certain embodiments thereof in the follow
ing description and on the drawing of which
Figure 1 is a perspective view of the several
2 O parts of a device embodying the invention.
Figure 2 is a longitudinal sectional view of the
same.
Figure 3 is a sectional view of a portion of the
device shown in Figure 2, the parts being shown
25 in a different position of operation.
Figure 4 is a section on the line 4—4 of Fig
ure 2.
Figure 5 is a section on the line _J—5 of Fig
ure
3.
'
30
Figure 6 is a fragmentary sectional view show
ing a modi?ed detail.
Figure 7 is a sectional view of a modi?ed form.
of the invention.
The invention may be embodied in an adapter
35 capable of being inserted in an ordinary outlet
adapted to receive an electric light bulb, as illus
trated in Figure 2, or may be embodied in a
?xture, an example of which is illustrated in
Figure 7. In either case, the invention includes
40 a support to which an electric light socket is
‘permanently but rotatably attached, and clutch
means by which the socket can be temporarily
locked against rotation relative to its support.
In Figure 2 is illustrated an adapter consisting
45 of a support in the form of a plug element I ll
_ and a socket element I2 permanently attached
thereto, the latter being adapted to receive the
base of a conventional electric light bulb I4. The
plug portion I0 is provided with a threaded shell
50 I6 adapted to screw into a conventional socket
20 having a central contact member 22. The
plug element Ill and.the socket element I2 may
be secured together for free relative rotation as
rotatable therein. Between the plug element III
and the socket element I2 is a clutch device 5
comprising two metal blocks 34 and 36 which
have square transverse cross sections of the same
size. Each of these blocks is provided with a
central bore 40 through which pass the rod 24
and the insulating tube 32. Surrounding the 10
tube 32 within the bores 40 is a spring‘ 42, one
end of which presses against a metal plate 44
mounted on one end of the plug element II), the
other end of the spring 42 bearing against a
metal plate 46 which ‘is secured to the base of 15
the socket shell I2. The plate 44 is electrically
connected as by a wire 48 to the shell I6'of the
plug element I0, the connection between the
wire 48 and the shell I6 being made by a metal
element such as a drop of solder 50 which pro
jects radially beyond the shell I6, so that, when
the adapter is screwed into the socket 20, the
projecting portion of the element 50 comes into
binding engagement with the edge (of the shell
in the socket 20 so that the plug element I0 is 25
thus frictionally held against rotation which
might tend to unscrew it from the socket 20, this
frictional binding engagement occurring before
the plug element I3 has penetrated the socket
far enough to press the resilient contact element 30
22 in against the bottom of the socket. This
leaves the head 26 of the rod 24 in sui?cient
contact with the element 22 for good transmis
sion of current but leaves the rod 24 to turn
freely without binding engagement against the 35
element 22..
The plates 44 and 46 are centrally depressed
as at 52 to receive the remote end faces of the
blocks 34 and 36. Thus the block 34 is held
against rotation relative to the plug element III 40
while the block 36 is held against rotation rela
tive to the socket element I2. As long as these
two blocks are relatively rotatable with respect
to each other, the socket element I2 can be freely
rotated relative to the plug element ID. This is 45
the normal condition of the adapter, as illus
trated in Figure 2. Thus, if a bulb I4 is engaged
in the socket I2, any effort to rotate the bulb I4
will result in rotation of the socket element I2
and the block 36. In order to hold the socket 50
element I2 against rotation for the removal or
insertion of a \bulb, the blocks 34 and 36 may
be temporarily held together by means of a clutch
element 56 which, as shown in Figure 1, may con
55 end and is peened at the other end as at 28 over‘ sist of a disk having a square central aperture 55
by a central rod 24 which has a head 26 at one
2
.
2,118,188
66 adapted to receive the block 54 or 36, and
a pair of parallel ears 66 at opposite sides of
the aperture 66, these cars being ,adapted to ?t
against opposite side faces of the block 36 as in
dicated in Figure 2. The clutch member 56 is
normally held in the position shown in Figure
2 by a light compression spring 62, one end of
which is preferably secured to the member 66.
If preferred, suitable tension springs 63 may be
employed as illustrated in Figure 6. Whenever
the clutch member 56 is moved toward theleft
tatably mounted on said support, clutch means
operable by a magnet against a restoring force
to hold said socket against rotation relative to
said support, and a non-magnetic casing enclos
ing said clutch means.
2. A device of the class described, comprising
a support, a socket for-an electric light bulb
rotatably mounted on said support, clutch means
operable by a magnet against a restoring force
so that the ears 60 simultaneously engage por
to hold said socket against rotation relative to
said support, and a non-magnetic casing sur
rounding said clutch means and socket to prevent
tions of the blocks 34 and 36, the blocks are held
against relative rotation. Since the plug ele
access thereto when a light bulb is in place in
the socket.
15 ment I0 is normally bound frictionally within
the socket 20, the socket I2 is thus held against
rotation permitting the insertion or removal of
an electric light bulb ll. If desired, the distance
of movement of the clutch member 56 toward
20 the left may be limited by the provision of a
pair of stops 64 to make difficult the operation of
the device otherwise than by the use of a suit
able magnet. A suitable tubular casing member
66- surrounds the adapter so as to prevent access
3. A device of the class described, comprising 15
a socket adapted to receive the base of an elec
tric light bulb, a support for said socket, means
connecting said socket to said support and nor
mally permitting free rotation of the socket rela
tive to the support, clutch means magnetically 20
operable to secure said socket and support tem
porarily against relative rotation and a non
magnetic casing enclosing said clutch means.
4. A device of the class described, comprising
25 thereto. In order to shift the clutch member 56,
a support, a socket for an electric light bulb ro
it ispreferably made of magnetic material, such
as iron, so that, if the poles ‘III of a strong mag
net are suitably positioned at opposite sides of
the casing 66, the magnetic flux will pull the
30 clutch member 56 to the left to the position
shown in Figure 3. If at the time the magnet
tatably mounted on said support, and magneti
cally operable clutch means for holdingsaid socket
against rotation relative to said support, said
is put into operation, the blocks 34 and 36 are
not registering, as illustrated in Figure 4, a slight
rotation of the bulb II will bring the block 36
35 into registry with the block 34, whereupon the
?ux of the magnet will draw the clutch member
56 to the left so as to lock the blocks together.
The casing 66 is preferably made of suitable non
magnetic material, such as copper or a moldable
40
plastic. This casing extends suillciently beyond
clutch means including an element of magnetic
material non-rotatable relatively to said socket 30
but axially movable into locking engagement
with said support, spring means normally hold
ing said element out of engagement with said
support, and a non-magnetic casing surrounding
said clutch means and socket to prevent access
thereto when a light bulb is in position in the
socket.
5. A device of the class described, comprising
a support, a socket for an electric light bulb
mounted on said support and normally rotatable 40
thereon, said socket including a threaded cylin
drical shell adapted to receive the base of a light
bulb and a central terminal normally engaged
the end of the socket shell II to prevent move
ment thereof toward the right sufficient to ex
pose the adapter. The casing is normally mount
ed on the end of the socket member 20, being by the tip of the base of the light bulb, a pair
45 threaded thereon as at 12 on the threaded por
of electric terminals on said support by which
tion usually provided on a socket shell for the the device may be connected into an electric
support of a shade or the like. The opposite circuit, means holding said socket on said sup
end of the casing 66 may be threaded as at 14 . port and comprising a central rod extending from
for the support of a shade.
said central terminal in the socket to one of the
Figure '7 shows a clutch mechanism similar to terminals on the support and electrically con
50
that illustrated in Figure 2, but mounted in a necting these terminals, means including a spring
structure which is a fixture rather than an surrounding a portion of said rod electrically
adapter to be screwed into the conventional connecting said socket shell with the other ter
socket. As therein shown, the support to which minal on said support, means insulating said
55 the socket is rotatably secured is a ?xed base
rod from said spring and socket shell, clutch
60 of suitable insulating material, this base be— means magnetically operable to hold said socket
ing secured to a wall 82 as bysuitable screws 64. against rotation relative to said support, and a
The plate 44 is mounted on the end of this base. non-magnetic casing enclosing said clutch means.
A binding screw 86 is electrically connected to the
6. A device of the class described, comprising
shell I! by a wire 68 which leads from the plate a plug portion adapted to be screwed into a con
45
50
55
60
44, the latter being electrically connected to the
ventional socket for an electric light, a socket
shell I2 as hereinbefore described. The head 26
of the rod 24 is electrically connected to a bind
ing post 90 by any suitable means such as a wire
65 or metal strip 92. A casing SM is permanently
portion normally rotatable relatively to said plug
secured by any suitable means to the base 60,
this casing being of non-magnetic material.
It is evident that various modi?cations and
changes may be made in the embodiments of the
70 invention herein shown and described without
departing from the spirit or scope of the inven
tion as defined in the following claims.
I claim:—
1. A device of the class described, comprising
75 a support, a socket for an electric light bulb ro
socket portion against rotation relative to said
plug portion, and a non-magnetic casing sur
rounding said cluteh means and socket portion
to prevent access thereto.
7. A device of the class described, comprising 70
portion, means connecting said plug and socket
portions together, clutch means permanently and
rotatably magnetically .operable to hold said 65
a plug portion adapted to be screwed into a con
ventional socket for an electric light, a socket
portion normally rotatable relatively to said plug
portion, means permanently and rotatably con
necting said plug and socket portions together,
2,118,188
clutch means magnetically operable to hold said
socket portion against rotation relative to said
plug portion, a lateral projection on said plug
portion adapted to engage the edge of a socket
into which the device is screwed to limit the pene
tration of said plug portion into the socket, and
a non-magnetic casing enclosing said clutch
means.
8. A device of the class described, comprising
10 a plug portion adapted to be screwed into a con
ventional electric light socket, a socket portion
rotatably connected to said plug portion, an axi
3 .
,
ally movable clutch element of magnetic mate- '
rial normally rotatable with one said member
relatively to the other said member, said clutch
element having a portion adapted to engage said
other member when said element is axially shift
ed from its normal inactive position whereby said
members are temporarily locked together against
relative rotation, and spring means yieldingly
pressing said clutch element to its normal inac
tive position.
,
_
_
HERBERT C. HEALEY.
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