U.S. patent number 3,909,100 [Application Number 05/469,912] was granted by the patent office on 1975-09-30 for mounting arrangement for a lamp.
Invention is credited to Thomas Hodge, Jr..
United States Patent |
3,909,100 |
Hodge, Jr. |
September 30, 1975 |
Mounting arrangement for a lamp
Abstract
A mounting arrangement for a cylindrical lamp, such as a
fluorescent lamp, comprises a pair of spaced apart sockets for
engaging opposite ends of the lamp so that an electrical connection
is made with the lamp. At least one of the sockets is movable
toward and away from the other socket and is mounted in a bracket,
at least a portion of which is also movable toward and away from
the other socket. A spring provides a biasing action axially of the
lamp to maintain a secure engagement of the lamp by the sockets.
When the lamp is disposed between the sockets so as to be engaged
thereby, movement of the movable portion of the bracket toward the
other socket and into a predetermined locking position tends to
compress the spring so as to maintain engagement of the lamp by the
sockets. Movement of the movable portion of the bracket away from
the other socket and away from the predetermined locking position,
when the lamp is engaged by the sockets, tends to release
compression on the spring and permits movement of the movable
socket away from the other socket. The lamp can then be disengaged
from the sockets and axially displaced from between the
sockets.
Inventors: |
Hodge, Jr.; Thomas (Watchung,
NJ) |
Family
ID: |
23865530 |
Appl.
No.: |
05/469,912 |
Filed: |
May 14, 1974 |
Current U.S.
Class: |
439/238;
362/220 |
Current CPC
Class: |
F21V
19/04 (20130101) |
Current International
Class: |
F21V
19/04 (20060101); H01R 033/08 (); H01R 033/06 ();
H01R 033/10 (); H05B 033/02 () |
Field of
Search: |
;339/50,52,54-57
;240/51.11,153F |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
958,330 |
|
May 1964 |
|
GB |
|
480,774 |
|
Aug 1929 |
|
DD |
|
1,141,714 |
|
Dec 1962 |
|
DT |
|
Other References
R A. Berlier, "Lamp Socket," Feb. 1967, p. 1077, IBM Technical
Disclosure Bulletin, Vol. 9, No. 9..
|
Primary Examiner: McGlynn; Joseph H.
Assistant Examiner: Feinberg; Craig R.
Attorney, Agent or Firm: Brumbaugh, Graves, Donohue &
Raymond
Claims
I claim:
1. A mounting arrangement for a cylindrical lamp comprising:
a. a pair of spaced apart sockets for engaging opposite ends of the
lamp so that an electrical connection is made with the lamp, at
least one of the sockets being movable toward and away from the
other socket;
b. bracket means for mounting the one socket including a first
bracket element engaging the one socket and mounted for pivotal
movement about one end toward and away from the other socket and a
second bracket element pivotally coupled at one end to the other
end of the first bracket element;
c. spring means adapted to provide a biasing action axially of the
lamp to maintain a secure engagement of the lamp by the sockets,
wherein movement of the first bracket element toward the other
socket and into a predetermined locking position, when the lamp is
disposed between the sockets so as to be engaged thereby, tends to
compress the spring means so that secure engagement of the lamp
with the sockets will be maintained by the biasing action of the
spring means, and movement of the first bracket element away from
the other socket and away from the predetermined locking position,
when the lamp is engaged by the sockets, tends to release
compression of the spring means and permits movement of the one
socket away from the other socket so that the lamp can be
disengaged from the sockets and axially displaced from between the
sockets; and
d. detent means engageable with the other end of the second bracket
element, engagement of the detent means with the second bracket
element preventing pivotal movement of the second bracket element,
thereby maintaining the first bracket element in its predetermined
locking position and preventing pivotal movement of the first
bracket element about its one end away from the other socket and
away from the predetermined locking position.
2. A mounting arrangement according to claim 1, wherein the spring
means is disposed between the first bracket element and at least a
portion of the one socket so that compression of the spring means
is achieved by relative movement between the first bracket element
and the portion of the socket.
3. A mounting arrangement according to claim 1, wherein the one
socket is located below the other socket and the lamp when engaged
by the sockets assumes a generally vertical orientation.
4. In a sign having a frame for supporting a sign face and a sign
face that permits light to pass therethrough and that is adapted
for illumination by at least one cylindrical lamp disposed in the
sign behind the face, the improvement of a mounting arrangement for
a cylindrical lamp comprising:
a. a pair of spaced apart sockets for engaging opposite ends of the
lamp so that an electrical connection is made with the lamp, one of
the sockets being located below the other socket and being movable
vertically toward and away from the other socket;
b. bracket means mounting the one socket, and including:
i. a first bracket element engaging the one socket and mounted for
pivotal movement about one end toward and away from the other
socket, and
ii. a second bracket element pivotally coupled at one end to the
other end of the first bracket element;
c. spring means disposed between the first bracket element and a
portion of the one socket; and
d. detent means formed on the sign frame and engageable with the
other end of the second bracket element, so as to prevent pivotal
movement of the second bracket element, thereby to maintain the
first bracket element in a predetermined locking position and to
prevent pivotal movement of the first bracket element about its one
end away from both the other socket and the predetermined locking
position;
pivotal movement of the first bracket element toward the other
socket and into the predetermined locking position, when the lamp
is disposed between the sockets so as to be engaged thereby,
tending to compress the spring means so that the spring means will
bias the one socket away from the first bracket element and toward
the other socket to maintain a secure engagement of the lamp with
the sockets when the first bracket element is in its predetermined
locking position, and
pivotal movement of the first bracket element away from the other
socket and away from the predetermined locking position, when the
lamp is engaged by the sockets, tending to release compression of
the spring means and permitting movement of the one socket away
from the other socket so that the lamp can be disengaged from the
sockets and axially displaced from between the sockets.
5. The improvement of claim 4, wherein the bracket means also
includes a third bracket element mounted on the sign frame and
pivotally coupled to the one end of the first bracket element so as
to permit pivotal movement of the first bracket element.
6. The improvement of claim 4, wherein an opening is formed in the
sign frame to permit access to the mounting arrangement and to
facilitate insertion of a lamp into the mounting arrangement.
Description
BACKGROUND OF THE INVENTION
A tubular or cylindrical fluorescent lamp is commonly mounted in a
fixture that includes spaced apart and opposing sockets to receive
the contact pins on the ends of the lamp and provide the necessary
electrical connection between the lamp and a source of electricity.
The lamp fixture is generally mounted on a wall or the ceiling of a
room so that the lamp held by the fixture lies in a generally
horizontal plane. To permit convenient installation and replacement
of a lamp, therefore, it is desirable, if not necessary, to be able
to mount the lamp in the fixture by first inserting one end of the
lamp into a corresponding socket and then moving the other end of
the lamp essentially laterally into position to engage the facing
socket.
Typically, the sockets of a fixture for a fluorescent lamp are
fixed in place. The ends of a lamp are inserted into slots in the
sockets and are held in place by reason of offsets in the slots or
by rotation of the lamp a part of a turn so that the contact pins
on the ends of the lamp rest on the walls of the slots so as to
prevent the pins from accidentally falling out of the sockets. Such
a fixture is described and illustrated in Beals U.S. Pat. No.
2,424,874.
In another type of lamp fixture, one of the lamp sockets is
elongated and has a spring loaded contact plate mounted in it. To
install a lamp in the fixture, one end of the lamp is inserted into
the elongated socket until the spring is fully compressed.
Sufficient clearance then remains for the other end of the lamp to
be moved laterally into alignment with the other socket. The
biasing action of the spring is utilized to seat the other end of
the lamp into the corresponding socket and to maintain the lamp
securely between the two sockets. Fixtures using elongated sockets
and spring biasing apparatus are illustrated in Mueller U.S. Pat.
No. 2,427,225 and in FIGS. 10-16 of Netting U.S. Pat. No.
2,323,073.
In a third type of lamp fixture, one of the sockets is mounted for
limited movement toward and away from the other socket. The
increased spacing between the sockets achieved by moving the
movable socket away from the other socket affords the necessary
clearance for inserting a lamp laterally into position between the
sockets. When the movable socket is moved back into its locking
position, the lamp is held securely between the sockets. Fixtures
of the third type are illustrated and described in Dansereau U.S.
Pat. No. 2,403,968 and Summers U.S. Pat. No. 2,228,646.
Since it is commonly more convenient to afford lateral access to a
lamp mounted in a fixture, the fixtures described in the patents
noted above are not constructed for replacement or installation of
a fluorescent lamp by longitudinal or axial movement of the lamp
relative to fixtures. The sole exception is the fixture illustrated
in FIGS. 1-9 of the Netting patent, in which one of the sockets is
pivotable away from the corresponding end of a lamp so as to permit
axial removal of the lamp from the fixture. The fixture of FIGS.
1-9 of the Netting patent must be swung out of a casing recessed in
a wall or ceiling, however, in order to accommodate movement of its
movable socket away from the corresponding end of a lamp, as shown
in FIG. 6 of the Netting patent.
One disadvantage of the prior art fixtures requiring lateral access
is that they can not be conveniently adapted for use in an outdoor
illuminated sign, for example. Such an illuminated sign has at
least one translucent or transparent sign face with a design or
message arranged thereon. The face is illuminated by tubular
fluorescent lamps oriented vertically or horizontally behind the
sign face. In order to use a conventional lamp fixture, therefore,
the sign face, or a corresponding blank rear panel, must be hinged
for outward pivotal movement in the manner of the Netting light
fixture.
While it may be possible to use a hinged front face or rear panel
in some situations, the convenience of conventional fixtures is
substantially reduced in a sign that has a considerable surface
area or is elevated on posts a considerable distance above the
ground. Then the individual responsible for maintaining the sign
must have a ladder to replace or install fluorescent lamps or
perhaps even a truck mounted, vertically movable platform mounted
on a boom, such as the device commonly referred to as a "cherry
picker."
Illuminated signs also often include apparatus other than the sign
face which would also have to be hinged for movement away from the
fluorescent sign lamps if conventional mounting fixtures are used.
For example, an illuminated sign may include a frame with a
transparent sign face and a plurality of translucent, flexible webs
or tapes mounted immediately behind the transparent face on
rotatable rolls. Each web has a plurality of different messages
printed on it or, perhaps, simply a plurality of different letters.
When the message on the sign is to be changed, the flexible webs
are rolled and unrolled so that the portions of the webs visible
through the transparent face are changed. In such a sign, the
fluorescent lamps are mounted behind both the transparent sign face
and the translucent flexible webs. Thus, considerable complicated
apparatus including the take-up rolls for the webs and possibly the
mechanism for rotating the rolls would have to be movable out of
the way to permit lamp installation and replacement in conventional
fixtures.
SUMMARY OF THE INVENTION
The present invention is directed to a mounting arrangement for a
cylindrical or tubular lamp, such as a fluorescent lamp, which
permits the lamp to be installed and replaced by essentially axial
or longitudinal movement of the lamp into and out of the mounting
arrangement. The mounting arrangement of the invention comprises a
pair of spaced apart sockets for engaging opposite ends of a
cylindrical lamp so that an electrical connection is made with the
lamp. At least one of the sockets is movable. toward and away from
the other socket and is mounted on a bracket. At least a portion of
the bracket is also movable toward and away from the other socket.
A spring provides a biasing action axially of the lamp to maintain
a secure engagement of the lamp with the sockets. When the lamp is
disposed between the sockets so as to be engaged thereby, movement
of the movable portion of the bracket toward the other socket and
into a predetermined locking position tends to compress the spring
so as to maintain engagement of the lamp by the sockets. Movement
of the movable bracket portion away from the other socket and away
from the predetermined locking position, when the lamp is engaged
by the sockets, tends to release compression of the spring and
permits movement of the movable socket away from the other socket.
The lamp can then be disengaged from the sockets and axially
displaced from between the sockets.
In a preferred embodiment of the invention, the spring is disposed
between the movable portion of the bracket and a portion of the
movable socket so that compression of the spring is achieved by
relative movement between the movable bracket portion and the
portion of the socket. The bracket includes two bracket elements,
one of which engages the movable socket and is mounted for pivotal
movement about one end toward and away from the other socket. The
second bracket element is pivotably coupled at one end to the other
end of the first bracket element. A detent is provided to engage
the free end of the second bracket element and thereby prevent
pivotal movement of the second bracket element. When the second
bracket element engages the detent, pivotal movement of the first
bracket element away from the other socket and away from the
predetermined locking position is also prevented. The movable
socket may be located below the other socket so that the lamp when
installed in the sockets assumes a generally vertical
orientation.
As can be seen from the above description, the present invention
provides a convenient mounting arrangement for fluorescent or other
tubular or cylindrical lamps that must be mounted in a restricted
space, without requiring lateral access to the lamps. The mounting
arrangement is particularly suited for use in outdoor illuminated
signs since a fluorescent lamp can be installed or replaced through
a relatively small access opening in a bottom or side edge of the
sign, instead of having a hinged or otherwise movable sign face to
permit access to the fluorescent lamp fixture.
BRIEF DESCRIPTION OF THE DRAWINGS
For a better understanding of the invention, reference made be made
to the following description of an exemplary embodiment, taken in
conjunction with the figures of the accompanying drawings, in
which:
FIG. 1 is a side sectional view of an illuminated sign equipped
with a fluorescent lamp mounting arrangement according to the
invention;
FIG. 2 is a sectional view taken along view line 2--2 of FIG. 1;
and
FIG. 3 is a view of a part of FIG. 1 showing the mounting
arrangement of the invention in two different positions during the
removal of a fluorescent lamp from the sign.
DESCRIPTION OF AN EMBODIMENT
FIG. 1 of the drawings is a longitudinally interrupted sectional
view of an illuminated sign 10 equipped with fluorescent lamp
mounting arrangements according to the present invention. While
only one mounting arrangement is illustrated, the sign 10 includes
a plurality of such mounting arrangements spaced across its width.
A frame fabricated of extruded aluminum sections, for example,
extends along the top, bottom and side edges of the sign 10. Two
similar aluminum extrusions 12 and 14 define the top and bottom,
respectively, of the sign frame. Along corresponding front edges of
extrusions 12 and 14 are similar pairs of extruded frame members 16
and 18, and 20 and 22, respectively. The frame members 18 and 22
are both configured to provide channels that receive the upper and
lower edges of a transparent sign face 24.
Immediately behind the sign face 24 are two rows of rollers 26 and
28. The rollers 26 are positioned above the rollers 28 and only one
roller of each row is illustrated in FIG. 1. The rollers 26 and 28
are vertically oriented and within each row, the rollers are
arranged in pairs. Behind the rows of rollers 26 and 28 are
corresponding rows of vertically oriented winding spools 30 and 32.
Within the rows of winding spools 30 and 32, the spools are
arranged in pairs corresponding to the pairs of rollers 26 and 28.
Each grouping of a pair of winding spools 30 or 32 and a pair of
rollers 26 or 28 mounts and displays a flexible web or tape 34 or
36 of translucent material. For example, two winding spools 30 hold
opposite ends of a translucent tape 34 and store excess tape not
currently being displayed. The portion of the tape 34 which is
being displayed extends between a corresponding pair of rollers 26
so as to be located immediately behind the transparent sign face
24. When the portion of the translucent tape 34 displayed behind
the sign face 24 is to be changed, the tape is unwound from one
winding spool 30 and wound up on the other winding spool 30 of the
spool pair by any appropriate mechanism (not shown) until the
desired portion of the tape 34 is disposed between the
corresponding pair of rollers 26. In the sign illustrated in FIG.
1, each translucent tape 34 or 36 has printed on it each of the
letters of the alphabet, numerals from zero to nine and additional
characters such as a period, a comma, a dash and other punctuation
marks. Each grouping of two winding spools and two rollers occupies
one letter position on the sign 10 so that a series of letters and
words can be displayed on the sign, depending upon the number of
winding spool and roller groupings included in the sign.
Centrally located in each grouping of two winding spools 30 and two
rollers 26 and extending the height of the sign 10 through a
vertically aligned grouping of two winding spools 32 and two
rollers 28 is a cylindrical fluorescent lamp 38. Being so located,
the lamp 38 can illuminate the portions of the tapes 34 and 36
currently displayed. At its upper and lower ends 40a and 40b, the
lamp 38 has pair of protruding pins 41 (shown in FIGS. 2 and 3)
that engage and make electrical connections with sockets 42a and
42b. Each socket 42a, 42b has a flange portion 50a, 50b at one end
and a shank portion 52a, 52b, extending from the flange portion.
Electrical wires 44a, 44b extend from the base of the shank portion
52a, 52b and are connected into an appropriate electrical circuit
(not shown). The sockets 42a and 42b are generally cylindrical in
shape, but one edge of each of the shank portions 52a and 52b is
flattened, as best shown in FIG. 2.
The upper socket 42a for the fluorescent lamp 38 is mounted in a
bracket 46 carried in grooves formed in the top frame member 12.
The lower socket 42b is mounted in a bracket 48 supported on the
bottom frame member 14. As illustrated in FIGS. 1 and 2 of the
drawings, the shank portion 52b of the socket 42b is received in an
opening that is formed in the bracket 48 and has a corresponding
generally circular configuration with a flattened edge. Thus, when
the socket 42b is seated in the bracket 48, relative rotation of
the socket in the bracket is prevented. The bracket 46 has a
similarly shaped opening to receive the shank 52a of the socket 42a
and to prevent rotation of the socket in the bracket.
The bracket 48 includes end bracket elements 54 and 56 and a center
bracket element 58 that is pivotally connected at one end to the
bracket element 54 and at its other end to the bracket element 56.
The end bracket element 54 is a generally square aluminum member
with a pair of protruding lugs 60 stamped from its face and
extending from one side of the element 54. Each lug 60 has an
upwardly opening recess and the recesses in the lugs 60 receive a
portion of the central bracket element 58, as will be described
hereinafter. The end bracket element 56 is also a generally square
aluminum member with a pair of flanges 76 formed by bending
opposite side edges outwardly from the main body of the element.
Upwardly opening recesses in the flanges 76, like the recesses in
the lugs 60, receive a portion of the central bracket element
58.
As best shown in FIG. 2, the central bracket element 58 is a
rectangular aluminum stamping having a large opening 62 to receive
the lower socket 42b and an adjacent smaller opening 64 through
which extend the electrical wires 44b. A plastic grommet 66
protects the wires 44b from being cut by the edges of the opening
64. A plastic retainer 67 is glued to the top of the bracket
element 58 to hold the wires 44b, which extend lengthwise of the
element, in place on the element. Laterally extending slots 68 and
70 are formed adjacent the ends of the bracket element 58 and are
positioned to define pivot bars 72 and 74, respectively, at the
ends of the element. The pivot bar 72 is received in the recesses
in the lugs 60 of the end bracket element 54, while the pivot bar
74 is received in the recesses in the flanges 76 of the end bracket
element 56. As a result, the bracket elements 54 and 58 pivot about
the bar 72, while the bracket elements 58 and 56 pivot about the
bar 74.
When the bracket 48 is installed in the sign 10 and mounts a lamp
38, the end bracket element 54 is slidably received in a pair of
slots formed in the frame member 14 so as to support one end of the
central bracket element 58. The other end of the bracket element 58
is supported by the end bracket element 56 which rests on a
horizontal surface of the frame member 14 so as to form an obtuse
angle with the central bracket element. The end bracket element 56
is held against outward pivotal movement by a detent or stop 78
formed on the frame member 14. As described, the bracket 48 is in
its locking position and supports the fluorescent lamp 38 in the
socket 42b. A coil spring 80 that encircles the shank portion 52b
of the socket 42b is partly compressed between the flange portion
50b of the socket and the central bracket element 58. The biasing
force exerted by the compressed spring 80 helps to maintain the
fluorescent lamp 38 securely engaged with the sockets 42a and
42b.
When it is desired to replace the fluorescent lamp 38, because it
has burned out, for example, access to the lamp is gained through
an opening 82 formed immediately below the lamp in the lower frame
member 14. The opening 82 may remain open at all times or it may be
closed by a cover plate (not shown) that slides along in grooves
formed in the frame member 14. As shown in FIG. 3 of the drawings,
removal of the lamp 38 begins by moving the central bracket element
58 upwardly to compress the spring 80 fully against the flange 50b
of the lower socket 42b. The upward movement of the central bracket
element 58 is sufficient to permit the end bracket element 56 to be
pivoted in a clockwise direction out of engagement with the detent
78, as shown in full in FIG. 3. With the end bracket member 56
clear of the edge of the access opening 82, the central and end
bracket elements 58 and 56 can be pivoted downwardly through the
access opening, as shown in phantom in FIG. 3. The downward
movement of the bracket element 58 releases the compression on the
spring 80 and permits the contact pins 41 on the end 40b of the
lamp 38 to be unplugged from the socket 42b. Since the bracket 48
is pivoted completely out of the way of the end 40b of the lamp 38,
the lamp can be removed from the sign 10 by simple longitudinal or
axial movement through the opening 82.
The embodiment of the invention described above is an inexpensive
and convenient mounting arrangement for a fluorescent lamp and
permits installation and removal of a lamp with a minimum of access
being provided. In addition, no movement of a lamp is required,
when being removed from the mounting arrangement, until the lamp is
free to be displaced from the mounting arrangement in an
essentially continuous axial movement. The use of metal stampings
for the bracket elements 54, 56 and 58 is advantageous since such
stampings are inexpensive and convenient to manufacture and can be
quickly assembled. Nonetheless, the bracket elements 54-58 can be
fabricated in any other convenient manner and can be coupled
together more permanently by hinge pins or elongated pop
rivets.
It will be understood that the above described embodiment is merely
exemplary and that persons skilled in the art may make many
variations and modifications without departing from the spirit and
scope of the invention. All such modifications and variations are
intended to be within the scope of the invention as defined in the
appended claims.
* * * * *