U.S. patent number 3,829,679 [Application Number 05/386,010] was granted by the patent office on 1974-08-13 for lamp head assembly.
This patent grant is currently assigned to Chemetron Corporation. Invention is credited to Gerald L. Rogers.
United States Patent |
3,829,679 |
Rogers |
August 13, 1974 |
LAMP HEAD ASSEMBLY
Abstract
This assembly includes a lamp housing mounted to a support at
one end and having a pair of apertures at the other end providing
reading and examination lights. A lamp base is journal mounted
within the housing to the housing sidewalls by pivot elements which
are fixed to the lamp base and extend outwardly of the sidewalls.
Actuating levers are attached to each end of the pivot elements for
manual rotation of the lamp base to direct the lamp beam through
one or the other of the apertures. The housing is attached to the
support by an elbow joint, which permits the angle of elevation of
the housing to be adjusted and the support includes a swivel joint
which permits the housing to be rotated about its own longitudinal
axis.
Inventors: |
Rogers; Gerald L. (St. Louis,
MO) |
Assignee: |
Chemetron Corporation (Chicago,
IL)
|
Family
ID: |
23523777 |
Appl.
No.: |
05/386,010 |
Filed: |
August 6, 1973 |
Current U.S.
Class: |
362/269 |
Current CPC
Class: |
F21V
19/02 (20130101); F21V 21/30 (20130101) |
Current International
Class: |
F21V
21/30 (20060101); F21V 21/14 (20060101); F21V
19/02 (20060101); F21v 021/00 () |
Field of
Search: |
;240/52R,52BL,61.8,41.15,41.6,9R,73BA,73BJ,44.2,2R |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Moses; Richard L.
Claims
I claim as my invention:
1. A lamp head assembly comprising:
a. support means,
b. a housing including opposed ends and opposed sidewall means said
housing being mounted to the support means at one end and including
first and second apertures disposed in side by side relation at the
other end,
c. lamp means disposed interiorly of the housing between said
support means and said apertures and including:
1. a lamp, and
2. pivot means having a pivot axis transversely disposed of said
sidewall means and pivotally mounting said lamp means to said
sidewall means to direct said lamp in a direction to emit light
selectively through one of said apertures, and
d. actuating means attached to the pivot means and disposed
exteriorly of said housing to operatively pivot said lamp
means.
2. A lamp head assembly as defined in claim 1, in which:
e. the lamp means includes a base carrying the lamp,
f. the pivot means is attached to said base in non-rotatable
relation and journal mounted to said sidewall means,
g. the actuating means includes a pair of actuating levers mounted
to opposite ends of said pivot means to pivot said base and said
lamp.
3. A lamp head assembly as defined in claim 1, in which:
e. the lamp means includes a base carrying the lamp, the lamp
having a beam axis.
f. the pivot means includes opposed stub shafts fixedly attached to
said base and having opposed ends extending outwardly of said
sidewall means in journal relation thereto.
g. the actuating means includes a pair of actuating levers fixedly
attached to said opposed shaft ends and substantially aligned with
the beam axis to indicate the direction of said beam axis,
h. the housing sidewall means includes stop means engageable with
said actuating levers to determine the direction of the beam
axis.
4. A lamp head assembly as defined in claim 3, in which:
i. the lamp means includes opposed light shields extending
generally in the direction of the beam axis to shield light from
one aperture when the beam axis is directed through the other
aperture.
5. A lamp head assembly as defined in claim 4, in which:
j. the housing includes a light shield disposed between said
apertures and cooperating with the light shields of said lamp means
to shield light from one aperture when the beam axis is directed
through the other.
6. A lamp head assembly as defined in claim 1, in which:
e. the support means includes a transverse axis substantially
parallel with the pivot axis,
f. the housing includes a longitudinal axis and said housing is
rotatable about said transverse axis of the support means for
adjustment of the angle of elevation of said longitudinal axis.
7. A lamp head assembly as defined in claim 6, in which:
g. the support means includes a longitudinal swivel axis, and,
h. the housing is swivelable about said swivel axis through
substantially 180.degree..
8. A lamp head assembly as defined in claim 1, in which:
e. the support means includes a longitudinal swivel axis and swivel
means defined by said axis and having forward and rearward portions
connected in swivel rotation,
f. one of said portions includes a transverse axis,
g. shaft means defined by said transverse axis interconnects the
housing to said portion, and
h. the housing includes a longitudinal axis and said housing is
swivelable about said swivel axis through substantially 180.degree.
to alternate the position of the housing apertures and said housing
is rotatable about said transverse axis in elbow joint relation to
adjust the angle of elevation of said housing longitudinal
axis.
9. A lamp head assembly as defined in claim 8, in which:
i. the longitudinal swivel axis and the housing longitudinal axis
are alignable, and
j. stop means between the housing and said one portion define the
limits of angular adjustment of the housing about the transverse
axis of said one portion on either side of the axial alignment
position, the counterclockwise limit being different from the
clockwise limit.
10. A lamp head assembly as defined in claim 8, in which:
i. said one support portion includes an enlarged head having
arcuate bearing surfaces coaxial with said transverse axis, and
j. the housing means includes opposed compatible bearing faces
receiving the enlarged head in rotatable relation.
11. A lamp head assembly as defined in claim 10, in which:
k. said one support portion includes two circumferentially spaced
stop means,
l. said housing means includes two circumferentially spaced
shoulders selectively engageable by associated stop means to
determine the rotational limits of the housing about the transverse
axis of said one support portion,
m. one of said stop means is provided by a peg projecting outwardly
of said cylindrical head, and
n. the housing is swivelable about the longitudinal swivel axis so
that when the swivel axis is horizontal and the peg engages one
shoulder the angle of elevation of the housing longitudinal axis is
different from when the housing is swivelled through one hundred
and eighty degrees (180.degree.) with the swivel axis horizontal
and the other stop means engages the other shoulder.
12. A lamp head assembly comprising:
a. support means including;
1. a longitudinal axis and a transverse axis,
2. swivel means, including forward and rearward portions connected
in swivel relation 180.degree. about said longitudinal axis,
and
3. one of said portions including an enlarged cylindrical end
coaxial with said transverse axis said portion providing
circumferentially spaced stop means,
b. a housing including;
1. a longitudinal axis,
2. opposed ends and opposed sidewall means extending between said
ends,
3. one of said ends including coaxial arcuate bearing surfaces
engageable with said enlarged cylindrical end of the support means
and including circumferentially spaced stop means engageable with
said support portion stop means, and the other of said ends
including first and second apertures disposed in side by side
relation on either side of said housing longitudinal axis, and
4. handgrip means at said other end disposed between said
apertures,
c. lamp means disposed interiorly of the housing and including:
1. a lamp having a beam axis,
2. a base carrying the lamp,
3. pivot means including opposed pivot portions fixedly attached to
the base and having end portions extending through the sidewall
means in journal relation thereto to direct said beam axis to emit
light selectively through one of said housing apertures, and
4. opposed light shields mounted to the base and extending
generally in the direction of the beam axis to shield light from
one aperture when the beam axis is directed through the other
aperture,
d. actuating means including a pair of actuating levers attached to
said pivot end portions exteriorly of said sidewall means and
aligned with said beam axis to pivot said lamp and base and
indicate the direction of the beam axis, and
e. said housing sidewall means including exterior stop means
engageable by the actuating levers to limit the angular movement of
the beam axis.
Description
BACKGROUND OF THE INVENTION
This invention relates generally to lamp heads and particularly to
an articulated lamp head having a single lamp to provide a dual
lighting purpose.
It is necessary in some situations to provide lighting equipment
having the capability of supplying two qualities of lighting, each
suitable for a specific purpose. An example of this is to be found
in a hospital room where the patient requires a particular quality
of light for reading purposes and the attending physician requires
a different quality of light for examination purposes.
In the past these requirements have been satisfied by providing two
independent pieces of lighting equipment each serving one specific
purpose. This is an expensive solution particularly where
articulating lamps are concerned. A possible alternative solution
lies in the provision of either dual lamp heads or compound lamp
heads having dual light bulbs. Neither of these solutions is
particularly attractive, however, because of the expense involved
in providing two heads and the complexity involved in providing a
compartmentalized housing for a compound head. In addition, the
need to provide duplicate switches and wiring is a considerable
drawback.
The present lamp head assembly overcomes these and other problems
in a manner not disclosed in the known prior art.
SUMMARY OF THE INVENTION
This lamp head assembly provides two qualitatively different light
sources, suitable for reading or examination purposes, using a
single housing and a single lamp. The housing includes dual
apertures and the lamp is pivotally mounted within the housing so
that the lamp beam can be directed through either aperture.
The housing is particularly adapted for elevation angle adjustment
and is attached to a support by means of an elbow joint for this
purpose. The support is provided with a swivel joint so that the
housing can be rotated about its longitudinal axis to modify the
range of elevational angle movement without changing the amount of
such movement.
This lamp head assembly is relatively simple and inexpensive to
manufacture and install and can be used by anyone without special
instruction.
It is a primary object of this invention to provide a lamp head
assembly, which includes a housing mounted to a support at one end
and having dual light apertures at the other end, and to provide
lamp means pivotally mounted within the housing for movement of the
lamp beam to direct said beam selectively through one of the
apertures and said lamp means being actuated manually by exterior
levers attached to said pivot means.
It is another object to provide a lamp base carrying the lamp, said
base having stub shafts fixedly attached thereto to provide the
pivot means.
A further object is to provide actuating levers, attached to each
end of said stub shafts outwardly of the housing sidewalls, which
are aligned with the lamp axis to indicate the position of said
axis and the direction of the lamp beam.
Another important object is to provide lamp means having opposed
light shields extending generally in the direction of the beam to
shield light from one housing aperture when the lamp is directed
through the other aperture.
Yet another object is to provide a light shield attached to the
housing between the apertures and cooperating with the light
shields of the lamp means.
It is another important object of the invention to provide support
means which include a longitudinal swivel axis and a transverse
axis and to provide swivel means including forward and rearward
relatively swivelable portions one of said portions being connected
to the housing for swiveling said housing 180.degree. about the
longitudinal axis and one of said portions being attached to the
housing for rotating said housing about the transverse axis to
permit adjustment of the angle of elevation of said housing.
It is another object to provide one of the swivel portions with an
enlarged cylindrical end and to provide the housing with opposed
coaxial arcuate bearing surfaces engageable with said enlarged
cylindrical end for providing an elbow joint between the housing
and the support to facilitate said housing elevational
adjustment.
Another object is to provide the enlarged cylindrical end with
circumferentially spaced stop means and to provide the housing with
cooperating circumferentially spaced stop means to define the
elevational angle range of the housing.
It is an important object to provide a different range of angular
elevational movement above and below the horizontal so that the
housing can be adjusted to different positions when it is twisted
through 180.degree. about the swivel axis.
Yet another important object is to provide stop means on the
housing sidewalls cooperating with the actuating lever to define
the range of movement of the lamp means on either side of the
longitudinal axis of the lamp housing.
It is another object of the invention to provide one of the housing
apertures with an examination lens to produce light having a
different quality to that emitted from the other aperture.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view of the lamp head assembly showing the
housing partly in cross section with the interior lamp base in an
intermediate position;
FIG. 2 is an elevational view showing the housing partly in cross
section and depressed to the low point of the first elevational
range with the lamp in the reading position;
FIG. 2A is a diagrammatic representation of the first elevational
range;
FIG. 3 is an elevational view showing the housing partly in cross
section, swiveled through 180.degree. to a second elevational range
and depressed to the low point of said range with the lamp in the
examination position;
FIG. 3A is a diagrammatic representation of the second elevational
range;
FIG. 4 is an end view of the assembly;
FIG. 5 is a plan view of the assembly;
FIG. 6 is a cross sectional view taken on line 6--6 of FIG. 5;
FIG. 7 is a sectional view taken on line 7--7 of FIG. 1;
FIG. 8 is a sectional view taken on line 8--8 of FIG. 1; and
FIG. 9 is a sectional view taken on line 9--9 of FIG. 8.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now by characters of reference to the drawings and first
to FIGS. 1 through 3 it will be understood that the lamp head
assembly generally indicated by numeral 10 is mounted to the end of
a support arm such as the telescopic arm indicated in phantom
outline by numeral 11. In FIG. 1 the lamp head 10 is longitudinally
aligned with the support arm 11 and includes a housing 12 which is
attached to the support arm 11 by means of a swivel assembly
generally indicated by numeral 13 and constituting a support means.
The longitudinal axis of the housing is indicated by H.
Because of the swivel assembly 13 the housing is capable of being
rotated about the longitudinal axis of the support 11 through
180.degree. by twisting the housing handgrip 14. An elbow joint 18
between the housing 10 and the support 11 permits the housing 12 to
be moved through a first angular elevational range having limits
indicated by H in FIG. 2A. The housing is shown at the low point of
this range in FIG. 2. When the housing is swiveled through
180.degree. a second angular elevational range is available having
limits indicated by H in FIG. 3. The housing is shown at the low
point of this range in FIG. 3. The first and second angular ranges
are qualitatively the same, 90.degree. in the preferred embodiment,
but are differently located relative to the swivel axis.
As clearly shown in FIG. 1 a lamp assembly generally indicated by
numeral 15 is mounted interiorly of the housing 12. Said assembly
15 is pivotally mounted between the sidewalls 16 of the housing 12
for movement relative to said housing 12. The lamp assembly is
manually actuated by means of a pair of levers 17 mounted to the
lamp assembly 15 exteriorly of the housing 12, said levers
constituting an actuating means selectively directing the lamp
assembly 15 through either an examination aperture 20 or a reading
aperture 21, which are provided at the remote end of the housing
12. It will be understood from FIGS. 1 - 3 that the lever 17 is
aligned with the lamp and provides an indicator showing the
location of the lamp assembly. The range of movement of the lamp
assembly 15 on either side of the housing axis H is indicated by E
and R.
Turning now more specifically to the details of the device it will
be understood that the housing 12 is formed from a pair of similar
portions 22 and 23 which define an examination chamber 24 and a
reading chamber 25 each being provided with a plurality of light
and ventilation baffles generally indicated by numeral 26 and shown
in detail in FIG. 9. The housing portions 22 and 23 are attached at
the elbow joint end by a plurality of self-tapping threaded
fasteners 27 as shown in FIG. 5 and at the handgrip end by a single
threaded fastener 28.
The swivel assembly 13 is best shown in FIGS. 8 and 10 and includes
a rearward portion 30 and a forward portion 31 having a washer 32
therebetween to facilitate relative rotation. The forward and
rearward portions 31 and 30 are held together by means of a hollow
bolt 33 which is threadedly connected to the forward portion 31 and
constitutes a swivel shaft. The hollow bolt 33 receives the
electric cord 34 and provides a means by which said cord is
directed to the interior of the housing 10 for connection to the
lamp assembly 15 and the switch indicated by numeral 29. The swivel
assembly forward portion 31 includes a pair of opposed pins 35 and
the rearward portion 30 includes an annular groove 36, which is
provided with a stop pin 37 so that the swivel assembly portions
can be relatively rotated substantially 180.degree. in each
direction.
The elbow joint 18 between the housing 10 and the support 11 is
formed as follows. The swivel assembly forward portion 31 includes
an enlarged generally cylindrical head 40 and the housing includes
a joint portion 41 in the nature of a socket providing arcuate
surfaces 42 and 43 which receive the head 40 in bearing relation.
The structural cooperation of parts provides an elbow joint having
an axis of rotation defined by a bolt 44 which holds the housing
portions 22 and 23 together and constitutes shaft means. The bolt
44 provides a means of adjusting the tension of the elbow joint and
when the desired tension is achieved by tightening the screw 45
against the nut 46 and washers 47 the set screw, indicated by
numeral 48 in FIG. 8, is tightened to lock the cylindrical head 40
to the bolt 44. The cylindrical head 40 is hollow to permit passage
of the cord 34 therethrough as indicated in FIGS. 2 and 10.
The range of angular movement permitted by the elbow joint 18 is
determined stop means provided by engagement between the housing 12
and the swivel assembly forward portion 31. In the preferred
embodiment the total range of movement is 90.degree. which, in the
first angular range shown in FIG. 2A, permits the housing 10 to be
depressed to an elevation of 30.degree. below the horizontal and
raised to an elevation of 60.degree. above the horizontal and,
following the twisting of the lamp about the swivel axis through
180.degree. to the second angular range shown in FIG. 3A, permits
the housing to be depressed to an elevation of 60.degree. below the
horizontal and raised to 30.degree. above the horizontal.
The stop means providing the limits of elevational movement are
best shown by FIGS. 2 and 3, which indicate the structural
arrangement of parts in the two limit positions. The arcuate faces
42 and 43 which receive the elbow joint cylindrical head 40 are
defined by shoulders 51, 52 and 53, 54 respectively. As shown in
FIG. 2 the cylindrical head 40 includes a projecting stop pin 50
which is engageable with shoulder 51 when the angle of elevation of
the housing 10 is at the low point of the first angular range. The
swivel assembly forward portion 31 includes a shank 55 which is
engageable with shoulder 52 when the angle of elevation of the
housing is at the high point of the first angular range. This high
point, of course, corresponds to the low point of the second
angular range shown in FIG. 3 and this engagement is clearly shown
in FIG. 3. It will be recalled that in order to achieve this second
angular range the housing 10 must be twisted through 180.degree.
.
The pivotal mounting of the lamp assembly 15 within the housing is
best indicated by reference to FIGS. 1 and 7. As shown in FIG. 1
the lamp assembly includes an L-shaped insulator block 60 of nylon
or similar material constituting a base. As shown in FIG. 7 the
block 60 includes a pair of stub shafts 61 fixedly attached thereto
in non-rotatable relation. The sidewalls 16 are provided with
bushings 62, which receive said stub shafts in rotatable relation.
The actuating levers 17 are attached to the remote ends of said
stub shafts 61 as by fasteners 64, said shafts including flats 65,
which preclude relative rotation between the levers 17 and the
shafts 61. It will be understood that this arrangement provides
that, as the levers 17 are rotated, the insulator block 60 is also
rotated. A lamp 66, which is carried by the block 60 by means of a
bracket 67, is also rotated by said actuating levers 17 and may
thereby be directed through either the examination aperture 20,
which includes an examination lens 70, or the reading aperture 21,
which includes a light guard 71. The lamp includes a beam axis
which is defined by the general direction in which the lamp is
oriented to emit light selectively toward the apertures. In the
preferred embodiment the lamp beam axis is coincident with the
longitudinal axis of the incandescent lamp 66. The lamp 66 is
flanked by light shields 72 and 73, which cooperate respectively
with a housing partition shield 74 located between the examination
chamber 24 and the reading chamber 25. The housing partition shield
74 cooperates with the shields 72 and 73 so that when the lamp 66
is directed through one of the apertures 20 or 21, light is
concentrated only through that aperture.
In the preferred embodiment the range of angular movement of the
lamp 66 is substantially 30.degree. on either side of the housing
longitudinal axis H shown in FIG. 1. As shown in FIGS. 2 and 3 the
actuating levers 17 are movable within segmental pockets 75 formed
within the sidewalls 16 and the range of movement of each actuating
lever 17 is defined by stops indicated by numerals 76 and 77 which
are formed in said segmental pockets 75. When the housing 10 is in
the position indicated in FIG. 2 and stop 77 is engaged by the
actuating lever 17, light passes through the reading aperture 21 in
the direction of the lamp beam axis indicated by R and when stop 76
is engaged by said actuating lever 17 light passes through the
examination aperture 20 in the direction of the lamp beam axis
indicated by E. As shown in FIG. 3 when stop 76 is engaged by the
actuating lever 17 light passes through the examination aperture 20
in the direction of the lamp beam axis indicated by E and when stop
77 is engaged by said actuating lever 17 light passes through the
reading aperture in the direction of the lamp beam axis indicated
by R. Thus, in the preferred embodiment, with the support arm 11 in
the horizontal position, the examination lamp beam can be directed
through 90.degree. above and below the horizontal while the reading
lamp beam can be directed through 60.degree. above and below the
horizontal.
It is thought that the structural features and functional
advantages of this lamp head assembly have become fully apparent
from the foregoing description of parts but for completeness of
disclosure the installation and operation of the assembly will be
briefly described.
The housing 12 is constructed from two substantially identical
upper and lower portions 22 and 23 which fit together along the
longitudinal axis H of said housing. This longitudinal axis splits
the mounting apertures 49 of the elbow joint bolt 44 (FIG. 8) and
the mounting apertures 69 of the stub shaft bushings 62 (FIG. 7)
and facilitates the pre-assembly of lamp head components. The
cylindrical head 40 of the swivel assembly 13 and the stub shafts
62 of the lamp assembly 15 can be aligned in position, for example,
within the lower housing portion 23 (FIG. 1). Once aligned for the
shaft assembly bolt 44 can be installed and suitably tightened and
the actuating levers 17 can be mounted to the stub shafts 61
following emplacement of the bushing 62. It is a simple matter to
then connect the housing portions 22 and 23 together by means of
fasteners 27 and 28 and the lamp assembly can then be mounted to
the support arm 11. Once installed the lamp assembly 15 can be
pivoted manually by means of the actuating lever until the lever 17
engages the appropriate housing stop 76 or 77 so that the lamp 66
is directed through either the examination aperture 20 or the
reading aperture 21. In effect, therefore, the lamp functions as
both a reading lamp and an examination lamp it being understood
that the examination aperture lens 70 provides the requisite
quality of light for examination purposes.
The range of the "reading" lamp and the "examination" lamp are
graphically illustrated in FIGS. 2A and 3A. The range of movement
of the housing 10 about the elbow joint 18 is defined by engagement
of the stop pin 50 with the housing shoulder 51 (FIG. 2) and by
engagement of the shank 55 with the housing shoulder 52 (FIG.
3).
FIG. 2A read in conjunction with FIG. 2 illustrates that with the
housing oriented to move through the first angular range the
reading lamp position R is clockwise of the housing axis H and the
examination lamp position E is counterclockwise of the housing axis
H. FIG. 3A read in conjunction with FIG. 3 illustrates that with
the housing oriented to move through the second angular range,
following rotation of 180.degree. about the swivel axis, the
reading lamp position R is counterclockwise of the housing axis H
and the examination lamp position E is clockwise of the housing
axis H. In the preferred embodiment, the combined range of the
examination lamp, with the support arm horizontal, is from vertical
to vertical whereas the combined range of the reading lamp is less
than this amount, it being understood that a greater examination
range is desirable. It will also be understood that once the lamp
is positioned, for example for examination purposes, it remains in
that position and no further actuation of the lever 17 is required
during the examination period. In the examination position the lamp
shield 73 overlaps the housing partition shield 74 to substantially
direct light through the examination aperture only. In the reading
position lamp shield overlaps shield 74 to substantially direct
light through the reading aperture only.
* * * * *