U.S. patent number 3,582,584 [Application Number 04/753,568] was granted by the patent office on 1971-06-01 for electrical switch having integral plastic parts.
This patent grant is currently assigned to Nibot Corporation. Invention is credited to Aaron R. Best.
United States Patent |
3,582,584 |
Best |
June 1, 1971 |
**Please see images for:
( Certificate of Correction ) ** |
ELECTRICAL SWITCH HAVING INTEGRAL PLASTIC PARTS
Abstract
There is disclosed an electrical switch including a plastic
housing having a fixed electrical contact mounted therein, an
integral plastic actuator including a pair of arms hingedly joined
together and a handle for controlling the position of the arms, the
outer ends of the arms being respectively swingably connected to
the housing at spaced-apart mounting points thereon for snap
movement between first and second stable conditions, and a movable
electrical contact held against the fixed electrical contact when
the arms are in the first stable condition and being held away from
the first electrical contact when the arms are in the second stable
condition.
Inventors: |
Best; Aaron R. (Wheeling,
IL) |
Assignee: |
Nibot Corporation (Chicago,
IL)
|
Family
ID: |
25031210 |
Appl.
No.: |
04/753,568 |
Filed: |
August 19, 1968 |
Current U.S.
Class: |
200/556; 200/295;
200/303; 200/537; 200/51.16; 200/339; 200/561 |
Current CPC
Class: |
H01H
15/18 (20130101); H01R 33/9555 (20130101); H01H
23/14 (20130101); H01H 2003/466 (20130101) |
Current International
Class: |
H01H
15/00 (20060101); H01H 23/00 (20060101); H01R
33/00 (20060101); H01R 33/955 (20060101); H01H
23/14 (20060101); H01H 15/18 (20060101); H01h
013/28 () |
Field of
Search: |
;200/76,67,67 DC1/
;200/6702,68,51.16,172A,168C |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
144,009 |
|
Jun 1920 |
|
GB |
|
634,561 |
|
Nov 1927 |
|
FR |
|
1,391,005 |
|
Jan 1965 |
|
FR |
|
Primary Examiner: Smith, Jr.; David
Claims
I claim:
1. An electrical wall switch for mounting on a wall in an opening
therein and for selectively connecting a source of electric power
to a load, said wall switch comprising a first integral housing
section mounted in use in the associated wall opening, a first
fixed electrical contact mounted on said first housing section and
adapted to be coupled to the load, a second fixed electrical
contact mounted on said first housing section and spaced from said
first electrical contact and adapted to be coupled to the source of
electric power, an integral plastic actuator including a pair of
arms and a hinge and a handle operatively connected to said arms
for controlling the position thereof, said hinge joining said arms
together adjacent to the other ends thereof and being integral
therewith, means respectively swingably connecting said arms
adjacent to the other ends thereof to said first housing section at
spaced-apart mounting points thereon, a second integral plastic
housing section including a decorative plastic face plate for
mounting on the associated wall and including a handle support
integral therewith for pivotally supporting said handle, pivotal
movement of said handle flexing said hinge to swing said arms with
respect to said mounting points toward and away from said fixed
electrical contacts, a movable electrical contact operated by said
actuator and being held against said fixed electrical contacts when
said arms are in the first stable condition thereof to connect the
source of electric power the load, said movable electrical contact
being held away from said fixed electrical contacts when said arms
are in the second stable condition thereof to disconnect the source
of electric power from the load.
2. The electrical wall switch set forth in claim 1, wherein said
first housing section further includes a base wall and a pair of
upstanding end walls integral therewith, and said second housing
section further includes a pair of side walls integral with said
face plate and disposed adjacent to said end walls and defining
therewith a closed box.
3. The electrical wall switch set forth in claim 1, wherein said
face plate has a slot therein receiving said handle therethrough
and said handle support is a trunnion adjacent to said slot, and
said handle includes a shaft rotatably journaled in said trunnion
to accommodate pivotal movement of said handle for swinging said
arms.
4. An electrical switch comprising a plastic housing including a
fixed contact support integral therewith, a fixed electrical
contact mounted on said fixed contact support, an integral plastic
actuator including a pair of arms and at least four hinges and a
handle for controlling the position of said arms, said handle
including an elongated bar slidably movable with respect to said
housing and having opposing mounting surfaces thereon, said movable
electrical contact including a pair of legs biased toward one
another and joined at one end thereof by a bight, said legs being
disposed respectively adjacent to the opposing surfaces of said
elongated bar an urged thereagainst, securely to retain said
movable electrical contact in a selective position on said
elongated bar, a first of said hinges joining one of said arms
adjacent to one of the ends thereof to one of said mounting
surfaces, a second of said hinges joining the other of said arms
adjacent to one of the ends thereof to the other of said mounting
surfaces, a third of said hinges connecting said one arm adjacent
to the other end thereof to said housing at a first mounting point
thereon, a fourth of said hinges connecting said other arm adjacent
to the other end thereof to said housing at a second mounting point
thereon spaced from said first mounting point, sliding movement of
said bar flexing said hinges to swing said arms with respect to
said mounting points toward and away from said fixed electrical
contact, the combined effective lengths of said arms exceeding the
distance between said mounting points to accommodate snap movement
of said arms between first and second stable positions thereof, and
a movable electrical contact carried by said bar and disposed
adjacent to said arms and being held against said fixed electrical
contact when said arms are in the first stable condition thereof
and being held away from said fixed electrical contact when said
arms are in the second stable condition thereof.
Description
This invention is directed to electrical switches, and more
particularly to an electrical switch including a minimum of
integral plastic parts and a set of electrical contacts.
An important object of the present invention is to provide an
electrical switch comprising a plastic housing including a fixed
contact support integral therewith, a fixed electrical contact
mounted on the fixed contact support, an integral plastic actuator
including a pair of arms and at least four hinges and a handle for
controlling the position of the arms, the handle including an
elongated bar slidably movable with respect to the housing and
having opposing mounting surfaces thereon, the movable electrical
contact including a pair of legs biased toward one another and
joined at one end thereof by a bight, the legs being disposed
respectively adjacent to the opposing surfaces of the elongated bar
and urged thereagainst, securely to retain the movable electrical
contact at a selected position on the elongated bar, a first of the
hinges joining one of the arms adjacent to one of the ends thereof
to one of the mounting surfaces, a second of the hinges joining the
other of the arms adjacent to one of the ends thereof to the other
of the mounting surfaces, a third of the hinges connecting the one
arm adjacent to the other end thereof to the housing at a first
mounting point thereon, a fourth of the hinges connecting the other
arm adjacent to the other end thereof to the housing at a second
mounting point thereon spaced from the first mounting point,
sliding movement of the bar flexing the hinges to swing the arms
with respect to the mounting point toward and away from the fixed
electrical contact, the combined effective length of the arms
exceeding the distance between the mounting points to accommodate
snap movement of the arms between first and second stable positions
thereof, and a movable electrical contact carried by the bar and
disposed adjacent to the arms and being held against the fixed
electrical contact when the arms are in the first stable condition
thereof and being held away from the fixed electrical contact when
the arms are in the second stable condition thereof.
Another object of the present invention is to provide an electrical
wall switch for mounting on a wall in an opening therein for
selectively connecting a source of electric power to a load, the
wall switch comprising a first integral housing section mounted in
use in the associated wall opening, a first fixed electrical
contact mounted on the first housing section and adapted to be
coupled to the load, a second fixed electrical contact mounted on
the first housing section and spaced from the first electrical
contact and adapted to be coupled to the source of electric power,
an integral plastic actuator including a pair of arms and a hinge
and a handle operatively connected to the arms for controlling the
position thereof, the hinge joining the arms together adjacent to
one of the ends thereof and being integral therewith, means
respectively swingably connecting the arms adjacent to the other
ends thereof to the first housing section at spaced-apart mounting
points thereon, a second integral plastic housing section including
a decorative plastic face plate for mounting on the associated wall
and including a handle support integral therewith for pivotally
supporting the handle, pivotal movement of the handle flexing the
hinge to swing the arms with respect to the mounting points toward
and away from the fixed electrical contacts, a movable electrical
contact operated by the actuator and being held against the fixed
electrical contacts when the arms are in the first stable condition
thereof to connect the source of electric power to load, the
movable electrical contact being held away from the fixed
electrical contacts when the arms are in the second sable condition
thereof to disconnect the source of electric power from the
load.
Further features of the invention pertain to the particular
arrangement of the parts whereby the above outlined and additional
operating features thereof are attained.
The invention, both as to its organization and method of operation,
together with further objects and advantages thereof, will best be
understood by reference to the following specification taken in
connection with the accompanying drawings, in which:
FIG. 1 is a perspective view of a table lamp provided with a socket
assembly incorporating the features of the present invention;
FIG. 2 is an exploded view on an enlarged scale of the socket
assembly of FIG. 1;
FIG. 3 is an enlarged cross-sectional view of the socket assembly
of FIG. 1 taken along the lines 3-3 thereof;
FIG. 4 is an enlarged cross-sectional view of the socket assembly
of FIG. 3 taken along the lines 4-4 thereof;
FIG. 5 is a view of an electrical wall switch mounted on a wall,
the wall switch representing a second embodiment of the
invention;
FIG. 6 is an exploded view on an enlarged scale of the electrical
wall switch of FIG. 5;
FIG. 7 is a side elevational view on an enlarged scale of one of
the wall switches of FIG. 6 with one of the housing sections
removed and illustrating the switch parts in the unconnected
condition thereof;
FIG. 8 is a side elevational view on an enlarged scale of the parts
of FIG. 7 and illustrating the switch parts in the disconnected
condition thereof;
FIG. 9 a view of an electrical wall switch mounted on a wall. The
wall switch representing a third embodiment of the invention;
FIG. 10 is an exploded view on an enlarged scale of the electrical
wall switch of FIG. 9; and
FIG. 11 is an enlarged view in vertical cross section of the
electrical wall switch of FIG. 10.
Referring to the drawings, and particularly to FIGS. 1 to 4
thereof, there is illustrated a table lamp 20 incorporating the
features of the present invention. The table lamp 20 includes a
base 21 supporting a socket assembly 25 for receiving a light bulb
22. The bulb 22 may be selectively turned off and on by the
operation of an actuator 100, as will presently be described.
Referring specifically to FIGS. 2 to 4, the socket assembly 25
includes a first integral housing section 30 having a body 31, the
body 31 being defined by a pair of spaced-apart sidewalls 32 and a
rear wall 33 integral with the sidewalls 32. Formed in each of the
sidewalls 32 on the free edge thereof is a slot 32a, the slots 32a
lying on a plane substantially normal to the planes of the side
walls 32. There is further provided a bottom wall 34 integral with
the bottom edges of the sidewalls 32 and the rear wall 33. Formed
integral with the bottom wall 34 is a semicircular hollow leg 36
which defines half of a duct 37. Disposed on top of the sidewalls
32 and the rear wall 33 and integral therewith is a semicircular
frustoconical neck 35.
Formed integral with the housing section 30 and on the rear wall 33
thereof is a first fixed contact support 40, the support 40
including a pair of spaced-apart L-shaped retaining flanges 41 and
42 spaced apart by a predetermined distance to define an L-shaped
slot 43, the slot 43 having both horizontal and vertical extents.
Disposed beneath the first contact support 40 and aligned therewith
and on the other side of the plane defined by the sidewall slots
32a is a second fixed contact support 50. The contact support 50
includes a pair of L-shaped retaining flanges 51 and 52 spaced
apart by a predetermined distance to define an L-shaped slot 53,
the slot 53 having a vertical extent vertically aligned with the
vertical extent of the slot 43 and having a horizontal extent
directed generally parallel to the horizontal extent of the slot
43.
Disposed adjacent to the contact support 40 and spaced therefrom is
a first trunnion 55 integral with the rear wall 33 and extending
outwardly therefrom and having an annular bearing surface 56.
Disposed adjacent to the contact support 50 and spaced vertically
below the first trunnion 55 by a predetermined distance is a second
trunnion 57 integral with the rear wall 33 and extending outwardly
therefrom and having an annular bearing surface 58.
The housing section 30 finally includes a ledge 59 integral
therewith and extending forwardly from the rear wall 33 and
disposed slightly beneath the neck 35.
The socket assembly 25 further comprises a second integral housing
section 80 which is a substantial mirror image of the first
integral housing section 30. Specifically, the housing section 80
includes a body 81, the body 81 being defined by a pair of
spaced-apart sidewalls 82 (only one is shown) and a rear wall 83
integral with the sidewalls 82. Formed in each of the sidewalls 82
on the free edge thereof is a slot 82a, the slots lying on a plane
substantially normal to the planes of the sidewalls 82 and
laterally respectively aligned with the slots 32a. Disposed on top
of the sidewalls 82 and the rear wall 83 and integral therewith is
a semicircular frustoconical neck 85. It is to be understood that
although the drawings illustrate only certain of the parts of the
second housing section 80, it in fact includes each of the parts
described with reference to the housing section 30. In particular,
there is a fixed contact support on the rear wall 83 of the housing
section 80 laterally aligned with the contact support 43, and a
fixed contact support 87 (FIG. 4) laterally aligned with the fixed
contact support 50. A trunnion is provided on the rear wall 83 of
the housing section 80 aligned with the trunnion 55, and there is a
trunnion 88 (FIG. 4) aligned with the trunnion 57.
The socket assembly 25 further comprises a first fixed electrical
contact 60 including a longer platelike leg 61, a shorter platelike
leg 62 directed generally parallel to the leg 61 and spaced
therefrom, and a connecting platelike web 63 connecting the legs 61
and 62. The socket assembly 25 also comprises a second fixed
electrical contact 70 including a longer platelike leg 71, a
shorter platelike leg 72 directed generally parallel to the leg 71
and spaced therefrom, and a connecting platelike web 73 connecting
the legs 71 and 72. Formed in the leg 71 is a threaded aperture 74
which is engaged by a headed screw 75. In passing, it is noted that
the platelike legs 61 and 71 are equal in horizontal extent, and
the platelike legs 62 and 72 are equal in horizontal extent.
The socket assembly 25 further comprises a socket 90 including an
annular sidewall 91 and a bottom wall 92. As can best be seen in
FIG. 3, a first input electrical contact 93 is secured to the
bottom wall 92 and extends downwardly therefrom. Secured to the
sidewall 91 is a second input electrical contact 94 having a
threaded aperture 95 therein engaged by a headed screw 96.
The socket assembly 25 also comprises an integral plastic actuator
100 including a handle portion 101 defined by an elongated slablike
bar 102 having opposing mounting surfaces 103 and 104. Respectively
disposed on the ends of the elongated bar 102 and integral
therewith is a pair of buttons 105 and 106. The actuator also
includes a first arm 111 swingably joined to the support surface
103 by means of a first hinge 112, and a second arm 113 swingably
joined to the support surface 104 by means of a second hinge 114.
There is also provided a pair of annular support shafts 115 and 117
each having a diameter in the embodiment shown, substantially equal
to the diameter of the trunnion bearing surfaces 56 and 58. The arm
111 is swingably joined to the support shaft 115 longitudinally
thereon by means of a hinge 116, and the arm 113 is swingably
joined to the support shaft 117 longitudinally thereon by means of
a hinge 118. As will be more fully appreciated hereinafter it is
important to note that the sums of the effective lengths of the
arms 111 and 113, including the thickness of the bar 102, is
greater than the predetermined distance between the trunnions 55
and 57.
The socket assembly 25 finally comprises a movable electrical
contact 120 including a bight 122 carrying a pair of legs 121
resiliently biased toward one another. Disposed on the free ends of
the legs 121 and depending toward one another are two fingers 123
having beveled ends 124.
In assembling the socket assembly 25, the electrical contact 60 is
forcibly urged into the L-shaped slot 43 defined by the retaining
flanges 41 and 42, and specifically the leg 61 is forced into the
horizontal extent of the slot 43, and the connecting web 63 is
forced into the vertical extent of the slot 43. Because the
thickness of the metal bent to form the contact 60 is slightly
greater than the width of the slot 43, this procedure insures
positive extension of the contact 60 by the support 40. Similarly
the second electrical contact 70 is forcibly urged into the
L-shaped slot 53 defined by the retaining flanges 51 and 52,
thereby to provide positive retention of the contact 70 by the
support 50. The movable electrical contact 120 is then mounted on
the actuator bar 102 on the portion thereof between the button 106
and the arms 111 and 113, but close to the latter. This is
accomplished by pushing the beveled ends 124 against the bar 102 to
spread apart the fingers 122 and 123, and thereby enable them to be
pushed on to the bar 102. The legs 121 are then disposed
respectively adjacent to the opposing surfaces 103 and 104 of the
bar 102 and urged thereagainst by the resiliency in the legs 121,
securely to retain the movable electrical contact 120 at a selected
position on the bar 102.
One end portion of the shaft 115 is forcibly urged into the
trunnion bearing surface 56, and because of the diametrical
relationship therebetween in the embodiment shown, the shaft 115 is
precluded from rotation with respect to the housing section 30.
Similarly, the corresponding end portion of the shaft 117 is
forcibly urged into the trunnion bearing surface 58 and is also
precluded from rotation with respect thereto in the embodiment
shown. Rendering the shafts 115 and 117 nonrotatable with respect
to the housing section 30 is not necessary and if the housing
sections are to be attached together, at least some rotation of the
shafts 115 and 117 would be desirable. The elongated bar 102 is
positioned within the slots 32a so as to be slidable with respect
to the housing section 30.
As shown to FIG. 3, the socket 90 is seated on the ledge 59 and
suitably secured to the housing section 30. The first input
electrical contact 93 is electrically connected to the adjacent
portion of the fixed electrical contact leg 61. A first wire 127 is
attached to the second input electrical contact 94 with the screw
96. A second wire 128 is connected to the fixed electrical contact
70 by means of the screw 75.
The second housing section 80 is then positioned adjacent to the
first housing section 30 such that the counterparts to the fixed
contact supports 40 and 50 are respectively aligned with the
adjacent portions of the fixed electrical contacts 60 and 70. In
addition, the two trunnions integral with the housing section 80
are aligned with the adjacent portions of the actuator shafts 115
and 117, and the slots 82a are aligned with the elongated bar 102.
The housing section 80 is then drawn against the housing section 30
to fix the electrical contacts 60 and 70 with respect to the
housing sections 30 and 80 and to fix the shafts 115 and 117 with
respect to the housing sections 30 and 80. The hollow semicircular
leg 36 mates with counterpart semicircular leg on the housing
section 80 to define a circular duct 37 for passage of the wires
127 and 128. If desired, the edges of the housing section 30
including the edges of the neck 35, the body 31 and the leg 36 are
joined by cement or the like to the corresponding edges of the
housing section 80. It should be appreciated however that in
general, the retention of the fixed electrical contacts 60 and 70
by the contact supports, and the retention of the actuator 100 by
the trunnions should be sufficient to hold the housing sections 30
and 80 together.
In operation, the actuator 100 is to be operated selectively to
turn on and off the light bulb 22. A first terminal from a source
of electric-power (not shown) is coupled to the first input
electrical contact 94 of the socket 90 via the wire 127, and the
second terminal of the source of electric power is coupled to the
fixed electrical contact 70 via the wire 128. To turn on the light
bulb 22, it is necessary electrically to connect the fixed
electrical contact 70 to the fixed electrical contact 60 which in
turn connects the second terminal of the electric power source to
the second input electrical contact 93 of the socket 90. Of course,
to turn off the light bulb 22, it is necessary to disconnect the
fixed electrical contact 60 from the fixed electrical contact
70.
Referring now to FIG. 3, the method of connecting and disconnecting
the contacts 60 and 70 will be described. The arms 111 and 113 of
the actuator 110 have only two stable conditions because of the
fact that the arm of the lengths of the arms 111 and 113, plus the
thickness of the bar 102 exceeds the distance between the trunnions
55 and 57. When the arms 111 and 113 are disposed on one side of
the plane defined by the trunnions 55 and 57, they are in the first
stable condition thereof, and when the arms 111 and 113 are
disposed on the other side of said plane they are in the second
stable condition thereof.
In FIG. 3, the solid lines illustrate the arms 111 and 113 toward
the right so as to be disposed in the stable condition thereof.
Because the movable electrical contact 120 is fixed at a selected
position on the bar 102, the contact 120 will be disengaged from
the aligned ends of the fixed electrical contact legs 62 and 72,
thereby electrically to disconnect the contacts 60 and 70 to cause
the light bulb 22 to be off. The arms 111 and 113 are shifted into
the second stable condition thereof by pushing on the bottom 105 to
move the bar 102 to the left as viewed in FIG. 3, the bar 102
flexing the hinges 112, 114, 116, 118 and carrying the arms 111 and
113 past the plane defined by the trunnions 115 and 117 and into
the second stable condition. As shown by the dashed lines of FIG.
3, the contact 120 is arranged on the bar 102 such that it then
engages the aligned ends of the fixed electrical contact legs 62
and 72, thereby electrically to connect the contacts 60 and 70 to
turn on the light bulb 22. To turn off the light bulb 22, the
button 106 is pushed to move the bar 102 to the right which carries
the arms 111 and 113 back to the first stable condition thereof,
thereby to disengage the contact 120 from the electrical contact
legs 62 and 72 to turn off the light bulb 22.
The socket assembly 25 together with the electrical switch
incorporated therein has the advantage over presently available
socket assemblies of being rather attractive and modern in
appearance. It is simpler and substantially less expensive to
manufacture various different shapes when the housing is formed of
molded plastic, as opposed to the standard metal socket assembly
available today.
Moreover, the socket assembly 25 has fewer parts than the presently
available socket assembly, primarily due to the fact that each of
the mounts are integrally molded with the associate housing section
and the actuator 100 is also integral, whereby the only additional
parts needed are the contacts 60, 70, and 120 and the socket
90.
Referring now to FIGS. 5 to 8, there is illustrated a wall switch
140 representing a second embodiment of the present invention. The
wall switch 140 includes a decorative face plate 142 and two screws
143 for attaching the face plate to the housing of the switch 140.
The switch includes an actuator 230 operable for connecting and
disconnecting a source of electric power to a ceiling light, for
example.
Referring specifically to FIG. 6, the wall switch 140 includes a
first integral housing section 150 having a body 151, the body 151
being defined by a pair of spaced-apart sidewalls 152 and a rear
wall 153 integral with the sidewalls 152. There is also provided a
bottom wall 154 integral with the bottom edges of the sidewalls 152
and the rear wall 153, the bottom wall 154 on the free edge thereof
having a pair of spaced-apart cutouts 155 and 156. There is also
provided a top wall 157 integral with the upper edges of the
sidewalls 152 and the rear wall 153, the top wall 157 having on the
free edge thereof and approximately centrally thereof a cutout 158.
Integral with the top wall 157 and adjacent to the slot 158 is a
laterally extending trunnion 159 having an annular bearing surface
160.
Extending outwardly from the top wall 157 and integral therewith
and in the plane thereof is a pair of mounting plates 161 each
having on the outer end thereof a laterally extending mounting ear
162. The lateral extent of each of the mounting plates 161 is
approximately double the lateral extent of the top wall 157. A
laterally extending mounting slot 163 is provided in each of the
ears 162, and a mounting aperture 164 is provided in each plate 161
adjacent to the associated slot 163.
Formed integral with the housing section 150 and on the bottom wall
154 thereof is a first fixed contact support 170, the support 170
including a pair of opposing C-shaped rails 171 and 172 facing one
another and disposed on the sides of the cutout 155. The support
170 also includes an abutment member 174 at the rear end of the
cutout 155 and extending upwardly from the bottom wall 154.
Disposed laterally of the first fixed contact support 170 is a
second fixed contact support 180 including a pair of opposing
C-shaped rails 181 and 182 facing one another and disposed on the
sides of the cutout 156. The support 180 includes an abutment
member 184 at the rear end of the cutout 156 and extending upwardly
from the bottom wall 154.
Disposed on the right-hand sidewall 152 (as viewed in FIG. 6)
adjacent to the bottom wall 154 is a laterally extending first
trunnion 190 having an annular bearing surface 191 therein and a
longitudinally extending slot 192 communicating with the bearing
surface 191. Disposed on the left-hand sidewall 152 and lying in a
plane that passes through the first trunnion 190 and is directed
generally parallel to the bottom wall 154 is a second trunnion 195
having an annular bearing surface 196 therein and a longitudinally
extending slot 197 communicating with the bearing surface 196.
The wall switch 140 further comprises a second integral housing
section 200 which is a substantial mirror image of the first
integral housing section 150. Specifically the housing section 200
includes a body 201, the body 201 being defined by a pair of
spaced-apart sidewalls 202 (only one is shown), a rear wall 203
integral with the sidewalls 202, a bottom wall (not shown), and a
top wall 207 having cutout 208 therein. It is to be understood that
although the drawings illustrate only certain of the parts of the
second housing section 200, it in fact includes each of the parts
described with reference to the housing section 150, except for the
mounting plates 161 which in the embodiment shown are both integral
with the first housing section 150. In particular, there are two
fixed contact supports on the bottom wall of the housing section
200 respectively laterally aligned with the fixed contact supports
170 and 180. Two trunnions are provided respectively on the
sidewalls 202 of the housing section 200 and aligned with the
associated trunnions 190 and 195. Lastly there is provided a
trunnion adjacent to the slot 208 of the housing section 200 and
integral with the top wall 207 and aligned with the trunnion 159 on
the housing section 150.
The wall switch 140 further comprises a first fixed electrical
contact 210 including a base 211 having thickness slightly less
than the distance between the legs on the C-shaped rails 171 and
172 and also having a threaded aperture 212 therein for engaging a
headed screw 215. The first fixed electrical contact 210 also
includes a spacer member 213 on the base 211 and carrying a contact
member 214 directed generally parallel to the base 211, the spacer
and contact members 213 and 214 having widths slightly less than
the distance between the inner ends of the C-shaped rails 171 and
172.
The wall switch 140 also comprises a second fixed electrical
contact 220 including a base 221 having a thickness slightly less
than the distance between the legs on the C-shaped rails 181 and
182 and also having a threaded aperture 222 therein for engaging a
headed screw 225. The second fixed electrical contact 220 also
includes a spacer member 223 on the base 221 and carrying a contact
member 224 directed generally parallel to the base 221, the spacer
and contact members 223 and 224 having widths slightly less than
the distance between the inner ends of the C-shaped rails 181 and
182.
The wall switch 140 further comprises an integral plastic actuator
230 including a first arm 232 having a main section 233, an offset
section 234 and a connecting section 235 integral therewith and
with the main section 233. There is also provided an annular
support shaft 237 having a diameter substantially equal to the
diameter of the trunnion bearing surface 191 in the embodiment
shown. The arm 232 is swingably joined to the support shaft 237
longitudinally thereon by means of a first hinge 236. The actuator
230 further includes a second arm 242 having a main section 243, an
offset section 244 and a connecting section 245 integral therewith.
There is also provided an annular support shaft 247 having a
diameter substantially equal to the diameter of the trunnion
bearing surface 196 in the embodiment shown. The arm 242 is
swingably joined to the support shaft 247 longitudinally thereon by
means of a second hinge 246. The other ends of the arms 232 and 242
are swingably joined together by means of a third hinge 248. As
described with respect to the embodiment of FIGS. 1 to 4, it is
important to note that the sum of the effective lengths of the arms
232 and 242 is greater than the distance between the trunnions 190
and 195.
The actuator 230 further includes a handle 250 having a pair of
shafts 252 (only one is shown) extending laterally outwardly
therefrom in opposing directions. The diameter of each of the
shafts 252 is slightly less than the diameter of the trunnion
bearing surface 160. The actuator 230 finally includes a link 253
joined to the handle 250 by means of a fourth hinge 254, and joined
by means of a fifth hinge 255 to the arm 242 at a point thereon
near the hinge 248.
The wall switch 140 finally comprises a movable electrical contact
260 including a contact member 261 in the form of a plate, the
member 261 carrying a leg 262 directed generally parallel thereto
and being resiliently biased toward the member 261. There is also
provided a finger 263 on the free end of the leg 262 for engaging
the member 261.
In assembling the wall switch 140, the fixed electrical contact 210
is mounted in the fixed contact support 170 by sliding the base 211
into the opposing C-shaped rails 171 and 172 and up against the
abutment member 174. Similarly, the second fixed electrical contact
220 is mounted in the fixed contact support 180 by sliding the base
221 into the opposing C-shaped rails 181 and 182 and up against the
abutment member 184. By reason of the spacer members 213 and 223,
the contact members 214 and 224 are spaced from the housing bottom
wall 154 and lie in a common horizontal plane. The movable
electrical contact 260 is mounted on the actuator arms 232 and 242
by moving the leg 262 away from the contact member 261, and then
moving the contact 260 such that the leg 262 is disposed directly
over the hinge 248. Due to the resiliency of the leg 262, it is
urged against the arms 232 and 242, securely to retain the movable
electrical contact 260 at the selected position thereon.
One end portion of the shaft 237 is forcibly urged into the
trunnion bearing surface 191 with the hinge 236 being seated within
the slot 192. Because of the diametrical relationship between the
support shaft 237 and the trunnion bearing surface 191, the shaft
237 is precluded from rotation with respect to the housing section
150. Similarly, the corresponding end portion of the shaft 247 is
forcibly urged into the trunnion bearing surface 196 with the hinge
246 being seated within the slot 197, the shaft 247 also being
precluded from rotation with respect to the housing section 150. As
was the case with the embodiment of FIGS. 1 to 4, it is not
necessary that the shafts 237 and 247 be nonrotatable with respect
to the housing section 150, but instead may be rotatable. The
adjacent shaft 252 on the handle 250 is then rotatably journaled
into the trunnion bearing surface 160 so as to be pivotal with
respect to the housing section 150, with part of the handle 250
extending through the slot 158 and out of the housing section
150.
The second housing section 200 is then positioned adjacent to the
first housing section 150 and between the free opposing edges of
the mounting plates 161 and such that the counterparts to the fixed
contact supports 170 and 180 are respectively aligned with the
adjacent portions of the fixed electrical contacts 210 and 220. In
addition, the two trunnions integral with the housing section 200
that correspond to the trunnions 190 and 195 are aligned with the
adjacent portions of the actuator shafts 237 and 247, and the
trunnion counterpart to the trunnion 159 is aligned with the
adjacent shaft 252. The housing section 200 is then drawn against
the housing section 150 to seat each of the fixed electrical
contacts 210 and 220 between the associated opposing abutment
surfaces and between the associated opposing C-shaped rails,
thereby to fix the position of the contacts 210 and 220 with
respect to the housing sections 150 and 200. The drawing together
of the housing sections 150 and 200 also seats the shafts 237, 247
and 252 in the associated trunnions on the housing section 200. As
was the case with the embodiment of FIGS. 1 to 4 the edges of the
housing sections 150 and 200 may be joined together by cement or
the like. If however, the diameters of shafts 237 and 247 are
respectively equal to the diameters of the trunnion bearing
surfaces 191 and 196 as is the case in the embodiment shown, the
actuator 230 can hold the housing sections 150 and 200
together.
In operation, the actuator 230 is to be operated selectively to
connect and disconnect a source of electric power (not shown) to
and from a load such as a ceiling light fixture. Thus, for example,
one terminal of the electric power source is to be coupled directly
to one input of the ceiling light fixture, the second terminal of
the electric power source is to be coupled to the contact 210 by
use of the headed screw 215, and the second input of the ceiling
light fixture is to be coupled to the electrical contact 220 by use
of the headed screw 225. To turn on the ceiling light fixture, it
is necessary electrically to connect the fixed electrical contacts
210 and 220 together which in turn connects the second terminal of
the electric power source to the second input of the ceiling light
fixture. To turn off the light fixture, it is necessary to
disconnect the fixed electrical contacts 210 and 220.
Reference is now made to FIGS. 7 and 8 to describe the method of
connecting and disconnecting the contacts 210 and 220. As was the
case in the embodiment of FIGS. 1 to 4, the actuator arms 232 and
242 have only two stable conditions because of the fact that the
sum of the lengths of the arms 232 and 242 exceeds the distance
between the trunnions 190 and 195. When the arms 232 and 242 are
disposed on one side of the plane defined by the trunnions 190 and
195, the arms are in the first stable condition, and when the arms
232 and 242 are disposed on the other side of said plane they are
in the second stable condition.
In FIG. 7, the parts of the wall switch 140 are illustrated in the
position wherein the contacts 210 and 220 are disconnected. As
viewed in FIG. 7, the arms 232 and 242 are disposed above the plane
defined by the trunnions 190 and 195 so as to be in the first
stable condition thereof. The movable electrical contact 260
carried by the arms 232 and 242 at a fixed selected position
thereon is disposed away from the contacts 210 and 220. The link
253 is disposed essentially vertically as viewed in FIG. 7 and the
handle 250 is tilted toward one of the mounting plates 161.
To turn the ceiling light fixture on, the user grasps the handle
250 and pivots it about the pivot axis defined by the shafts 252
toward the position illustrated in FIG. 8 wherein the handle 250 is
tilted toward the second mounting plate 161. Because of the
location of the link 253 on the handle 250, the pivoting movement
of the handle 250 tilts the link 253 somewhat and moves the arm 242
downwardly, which movement is transmitted to the arm 232 via the
hinge 248. In FIG. 8, the arms 232 and 242 are in the second stable
condition thereof, that is, they are below the plane defined by the
trunnions 190 and 195. The arms 232 and 242 carry and urge the
movable electrical contact 260 against the fixed electrical
contacts 210 and 220 to connect the electric power source to the
load.
To disconnect the power source from the load, the handle 250 is
pivoted toward the first-mentioned mounting plate 161, which motion
carries upwardly the arms 232 and 242 by way of the link 253, again
to place the parts of the wall switch 140 in the condition
illustrated in FIG. 7.
As was the case with the embodiment of FIGS. 1 to 4, an important
advantage of the wall switch 140 having the construction just
described is the reduction in the number of separate parts. In the
particular embodiment described, the wall switch 140 had only eight
parts, namely, the housing sections 150 and 200, the fixed
electrical contacts 210 and 220, the headed screws 215 and 225, the
actuator 230, and the movable electrical contact 260. This
advantage may be more fully appreciated by considering that most of
the presently available wall switches now consist of 18 or more
parts.
Referring now to FIGS. 9 to 11, there is illustrated a wall switch
280 representing a third embodiment of the present invention.
Referring specifically to FIG. 10, the wall switch 280 includes a
first integral housing section 290 defined by a pair of
spaced-apart end walls 291 and a base wall 292 integral therewith.
Formed in the bottom wall 292 nearer to one of the end walls 291 is
a pair of laterally aligned notches 293 and 294 to define a fixed
contact support 295 therebetween. Formed in the base wall 292
nearer the other end wall 291 is a second pair of laterally aligned
notches 296 and 297 which define a fixed contact support 298
therebetween.
The wall switch 280 also comprises a first fixed electrical contact
300 including a bight 302 and a pair of parallely extending legs
301 thereon. Each of the legs 301 carries a finger 303 directed
toward the opposing leg 301. There is also included a headed screw
305 for engaging in an aperture in one of legs 301. The wall switch
280 further comprises a second fixed electrical contact 310
including a bight 312 and a pair of parallelly extending legs 311
thereon. Each of the legs 311 carries a finger 313 directed toward
the opposing leg 311. There is also included a headed screw 315 for
engaging in an aperture in one of the legs 311.
The wall switch 280 further comprises an integral plastic actuator
320 including a first arm 322 having a main section 323, an offset
section 324 and a connecting section 325 integral therewith and
with the main section 323. The arm 322 is swingably joined by means
of a first hinge 326 to one of the end walls 291 at a first
mounting point thereon. The actuator 320 further includes a second
arm 332 having a main section 333, an offset section 334 and a
connecting section 335 integral therewith and with the main section
333. The arm 332 is swingably joined by means of a second hinge 336
to the other of the end walls 291 at a second mounting point
thereon lying on a plane passing through the first mounting point
and directed generally parallel to the bottom wall 292. The other
ends of the arms 322 and 332 are swingably joined together by means
of a third hinge 338. Again, as previously described with respect
to the first two embodiments, it is important to note that the sum
of the effective lengths of the arms 322 and 332 is greater than
the distance between the first and second mounting points
respectively on the end walls 291.
The actuator 320 further includes a handle 340 having a pair of
shafts 342 (only one is shown) extending laterally outwardly
therefrom in opposing directions. The actuator 320 finally includes
a link 343 joined to the handle 340 by means of a fourth hinge 344,
and is joined by means of a fifth hinge 345 to the arm 332 at a
point thereon near the hinge 338.
The wall switch 280 further comprises a movable electrical contact
350 in the form of a sleeve and including a bight 352 and a pair of
parallelly extending legs 351 thereon. Each of the legs 351 carries
a finger 353 directed toward the opposing leg 351.
The wall switch 280 finally comprises a second integral housing
section 360 including a decorative face plate 361 with beveled
edges 362. Approximately centrally in the face plate 361 is a
rectangular cutout 363. Respectively on the sides of the cutout 363
and integral with the face plate 361 are a pair of laterally
aligned trunnions 364 (only one is shown). Each of the trunnions
364 has an annular bearing surface 365 therein and a longitudinally
extending slot 366 communicating with the bearing surface 365.
Adjacent to the ends of the face plate 361 are a pair of openings
367 for receiving the mounting screws 369. The integral housing
section 360 also includes a pair of laterally spaced-apart
sidewalls 368 integral with the face plate 361 and depending
downwardly therefrom.
In assembling the wall switch 280, the fixed electrical contact 300
is mounted in the fixed contact support 295 by spreading the legs
301 apart and sliding them onto the bottom wall 292. In a similar
fashion, the fixed electrical contact 310 is mounted on the fixed
contact support 298. The movable electrical contact 350 is mounted
on the actuator arms 322 and 332 by spreading apart the legs 351,
and then slipping the contact 350 around the hinge 338. The handle
340 is then passed through the slot 363 in the face plate 361 and
the shafts 342 are forcibly urged through the slot 366 and into the
trunnion bearing surfaces 365. If desired, the sidewalls 368 may
then be joined to the adjacent portions of the sidewalls 291 and
the base wall 292. The entire wall switch 280 may now be attached
to a wall 141 by merely passing the screws 369 through the openings
367 and into engagement with the wall 141.
In operation, the wall switch 280 performs essentially in the same
manner as the wall switch 140, whereby in the interest of brevity,
no further description of the operation of the wall switch 280 is
given except to not the parts in FIG. 11 are shown in solid lines
to indicate the disconnected condition and in broken lines to
indicate the connected condition. In the embodiment shown in FIGS.
9 to 11, the number of parts has been further reduced to seven, the
face plate 361 being included as one of those parts.
While there have been described what are at present considered to
be the preferred embodiments of the invention, it will be
understood that various modifications may be made therein, and it
is intended to cover in the appended claims all such modifications
fall within the true spirit and scope of the invention.
* * * * *