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Патент USA US2405035

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July 30, 1946.
D, |_, HARFORD
A
2,405,035
ELECTRICAL SWITCH
Filed Oct. 5, 1943
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2 Sheets-Sheet l
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BY
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INVENToR.
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July 30, 1946.
D, L, HARFORD
2,405,035
ELECTRICAL ‘SWITCH
Filed 00?.. 5, 1943
2 Sheets-Sheet 2
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ATTORNEY.
Patented July 30, 1946
2,405,035
UNITED STATES PATENT OFFICE
2,405,035
ELECTRICAL SWITCH
l
Dwight L. Harford, Downey, Calif., assìgnor to
A. Parley Johnson, Downey, Calif..
Application October 5, 1943, Serial No. 504,992
16 Claims. (Cl. 20D-_159)
2
This invention relates to electrical switches
and while capable of general use is particularly
adapted for use with illuminating devices, such
as, portable lanterns, flash-lights, and the like.
One object of the present invention is to pro
vide an electrical switch of novel construction
for` effecting continuous and intermittent light
ing of a portable lantern', flash-light, and other
similar device.
Another object of the invention is to provide
an electrical switch having a movable control
member which is at all times biased to inopera
tive position by the circuit completing means
through novel arrangement of the latter.
Another object is to provide an electrical
switch having novel cam means for controlling
continuous and intermittent operation of an il
l
'
Y
ence characters designate like parts throughou
the several views, 5 indicates> the base and bat
tery box of a portable lantern having pivotally
mounted thereon as at 6 a U-shaped two-part
hollow; cylindrical handle l (Fig. l). The bat
tery box 5 and handle ‘I are both made of non
conducting material, such as, for example,
“Tenite” or other suitable plastic composition.
The handle 'I supports a reflector 8, a lens 9, and
a lens-guard I0. Slidably mounted in the lower
portion ofthe handle 'l is a metal tube I-I pro
vided at one end thereof with a socket I2A to
receive a lamp I3. Extending through the metal
tube II is one end of an armoredV cable I4 around
which is an insulatingv bushing I5 provided with
an enlarged head I6 that is disposed within the
socket I2. The internal copper lead-_ of the cable
luminating device, and for preventing accidental
t4 extends through the head I 6 cf the bushing
operation of said device.
.
.
>I5 and is beaded as at I'I for engagement by the
'I‘hese and other objects of the present inven 20 beaded contact end of the lamp I3.
tion` will appear as the following description
From the tube II> the cable I4 extends rear
thereof proceeds, and in order to more clearly
wardly and upwardly around the handle l in
understand said invention reference may be had
teriorly thereof and then forwardly along the
to the accompanying drawings which illustrate
upper portion of said handle. The cable I4 is
one embodiment thereof.
25 guided by a curved guide I8 which is formed in
In said drawings:
tegrally with. the handle 1. The tubev Il has con
Fig. 1 is a side elevation, partly in section, of
tinuously engaged therewith one end of a spring
a portable lantern embodying the present in
brass contact member I9 the opposite end of
vention, with one-half of a twc` part handle re
which is connectedl with one side of a battery (not
moved for purposes of clearer illustration;
30 shown) contained within the battery box 5. The
Fig. 2 is an enlarged top plan View of the elec
opposite side of the battery has connected there
trical switch means illustrated in Fig. 1;
with a spring-brass contact member 20 which
Fig. 3 is a vertical transverse sectional view on
extends therefrom into continuous engagement
the line 3-3 of Fig. 2;
with the armored outer covering of the cable I4.
Fig. 4» is a vertical longitudinal sectional view _ With the construction thus far described, it will
on the line 4-4 of Fig. 2;
be apparent that when the cable I4 is advanced
Fig. 5 is an enlarged detail perspective View of
or retracted, like movement will be imparted
the base member constituting a part of the switch
thereby to the tube I I and lamp I3, thus adjust
means;
.
ing the latter to the desired focus within the
Fig. 6 is an enlarged detail top plan View of ULO reñector 8. The portable lantern previously de
the cam disc for controlling the “oiì” “ñash”
scribed is` of the same» general type disclosed in
and “on” positions of the switch;
the United States Patent No. 2,228,009 granted
Fig, '7 is a vertical longitudinal sectional View
January 7, 1941, to Dwight L. Harford.
on line ‘I-l of Fig. 6;
In accordance with the present invention, novel
Fig. 8 is an enlarged detail perspective view = switch means are provided whereby the lamp I3
of the stationary disc which cooperates with the
may be used continuously for some appreciable
cam disc;
Figs. 9 and 10 are enlarged detail side eleva
tions of the two contact strips, before and after
bending; and
Figs. 11, 12 and i3 are top plan views, partly in
section, showing the main parts in the positions
they occupy when the switch is in “om” “flash”
and “on” positions, respectively.
ReferringV to the drawings, wherein like refer
time, or in an intermittent manner for signalling
purposes, said switch means at the same time
serving as the means for advancing and retract
ing the cable I4 to focus the lamp I3 as herein
before described. As herein shown, said switch
means is preferably mounted, constructed and
operated in the following manner, and the ele
ments hereinafter described and constituting the
switch means are, unless otherwise specified,
2,405,035
¿l
3
made of non-conducting material, such as, for
example, “Tenite” or other suitable plastic com
condition, and before cap 39 is attached t0 disc
29, and then bent upwardly and over the head of
position.
screw 34 and toward screw 35. Strips 40 and 4I
thus provide the means for completing the cir
cuit to lamp I3 through engagement of strip 4l
Mounted on the upper portion of handle 'I for
horizontal sliding movement relative thereto is a
plate or base member 2| provided on the top
side thereof with two axially alined bosses 22 and
23, the boss 22 being of less height and of greater
diameter than the boss 23 (Fig. 5). Boss 22 is
provided on the top side thereof with ak pair of
diametrically opposite cam surfaces 2d surround
ing the boss 23 and which are inclined downwardly
with screw 35, and also provide means of double
tension for raising cap 39 to circuit breaking
position.
It will thus be noted that when cap v35i-and disc
29 are rotated counter-clockwise, as'viewed in
Fig. l1, to the position shown in said figure which
is the safety “off” position to render the switch
inoperable, the lugs 2l will, through likewise rota
and terminate in a pair of diametrically opposite _
tion of cam ring 28, ride up and along cam sur
shoulders or abutments 25. Engaged over boss 23
and rotatable in a horizontal plane relative to 15 faces 29 until abutments 39 engage the lugs 33 at
which point the latter will be engaged with the
said boss and the boss 22 is a disc 23 (Figs. 3, 6
low parts of cam surfaces 29, and the lugs 2l will
and '7) provided on the underside thereof with
be engaged with the high parts of cam surfaces
two diametrically opposite lugs or ears 21 that
24 adjacent the shoulders 25 thereof. Cap 39 and
project downwardly into engagement with the
cam surfaces 24. Disc 26 is further provided on 20 disc 23 will thus be held against further rotation
in said direction by lugs 33, and against accidental
the top side thereof with a cam ring 28 surround
downward movement through engagement of lugs
ing the boss 23 and having formed thereon a pair
2T with the high parts of cam surfaces 2/3 to com
of diametrically opposite cam surfaces 29 which
plete the circuit to lamp I3.
are inclined downwardly in the same direction as
When it is desired to use the lamp intermittently
cam surfaces 24 and terminate in a pair of di 25
as, for signalling purposes, cap 39 and disc 26 are
ametrically opposite shoulders or abutments 39.
rotated clockwise, as viewed in Fig. 1l, a quarter
Cam ring 28 has also formed thereon two diamet
turn or 90° from the safety “oli” position to the
rically opposite notches or recesses 3l (Figs. 6 and
position shown in Fig. 12, whereupon lugs 21 will,
7) which are disposed intermediate the ends of
30 through engagement of lugs 33 with the rising
the cam surfaces 29.
cam surfaces 29, ride down and along cam sur
Disc 29 is held against endwise displacement
faces 29 until notches 3l in cam surfaces 29 snap
from the boss 23 by a disc 32 (Figs. 3 and 8) pro
into engagement with the lugs 33, thus automat
vided on the underside thereof with a pair of di
ically determining the switch signaling position,
ametrically opposite lugs or ears 33 that project
downwardly into engagement with the cam sur
35 and rendering the switch operable to intermit
faces 29. Disc 32 is secured to the top of boss 23
by two spaced contact screws or posts 34 and 35
of good conducting metal, such as' brass, that ex
tend downwardly through suitable openings in
said disc, the boss 23, boss 22 and plate 2I, and 40
are threaded in suitable threaded openings in a
block 3B.
Block 36 is disposed within handle 1
and formed with a reduced upper end 3'I which
vextends into a slot 33 formed in said handle.
Block 36 thus holds plate 2| and the various parts
carried thereby in position on handle l, and per
mits horizontal sliding movement of said plate
and said ports as a unit relative tosaid handle
for purposes to be hereinafter described. The
free end of cable I4 extends into a suitable open
ing formed in block 36 and is secured therein by
the screws 34 and 35 which engage the internal
copper lead and the armored outer covering, re
spectively, of said cable. Rotation'is imparted to
disc 26 by a cap 39 which is engaged over the
disc 32 and boss 23 and secured in any suitable
manner to the disc 26.
Novel means are provided for completing the
circuit to lamp I3, said means also serving to raise
the cap 39 and disc 29, and hold the cam ring 29
in engagement with the lugs 33. As herein shown,
said means preferably comprises two superposed
resilient contact strips 49 and 4I (Figs. 3, 4, 9 and
10) of good conducting metal, such as spring
bronze, which are secured to disc 32 by the con
tact screw 34, and are somewhat semi-elliptical
in shape, or bent or curved in opposite directions
away from each other. Strip 159 extends from
screw 34 upwardly into engagement with cap 39
interiorly thereof, and then -downwardly over to
and above screw 35. Strip III normally extends
from screw 34 over to and above screw 35 and
then upwardly into engagement with the free
end of strip 49 Strips 49 and di are first secured
to disc 32 with their screw receiving ends in flat
tently complete the circuit to lamp I3 by a slight
downward pressure of the thumb applied inter
mittently on cap 39. Upon downward movement
of cap 39, strip «3l is moved into engagement with
screw 35 through Strip 49, as shown in broken
lines in Fig. 4, thereby completing the circuit to
lamp I3 through the copper lead of cable I4 which,
as hereinbefore described, is connected with one
side of the battery, the screw 34, the strip 4I, the
screw 35, and the armored outer covering of said
cable which, as hereinbefore described, is con
nected with the opposite side of the battery.
When thumb pressure on cap 39 is released the
strips 39 and ¿il raise said cap and disc 23, the
strip 4l at the same time moving out of engage
ment with screw 35 to break the circuit to lamp I3.
When it is desired to use the lamp for any
length of time, cap 39 and disc 26 are rotated
clockwise, as viewed in Fig. 11, approximately
one-half a revolution or 180° from the safety “off”
to the positive shown in Fig. 13 “on” position,
whereupon lugs 2'! will, through engagement of
lugs 33 with the rising cam surfaces 29, ride down
and along cam surfaces 24 until they engage the
abutments 25, thereby arresting the rotation of
said disc and cap, and automatically determining
the positive “on” position of the switch. At this
time cap 39, through engagement of lugs 33 with
the high parts of cam-surfaces 29 adjacent shoul
ders 39, will'have moved downwardly suiiicient
to move strip 4l into engagement with screw 35,
thereby completing the circuit to lamp I3 as here
inbefore described, and holding said circuit closed
~for any desired length of time.
It will further appear that since the armored
cable I4 is connected with block 35 as hereinbe
lfore described, the lamp I3 may be advanced
and retracted to adjust the focus thereof by mov
ing plate or base member 2|, and parts carried
thereby, forwardly and rearwardly on handle 1.
2,405,035
6
5
strip being bent upwardly at its free end for en
gagement with the free end of said first-named
~ ' There is thus provided a simple and inexpen
sive electrical switch whereby continuous'and in
termittent lighting of a portable lantern, nash
light and other similar device may be quickly and
strip.
easily effected. Also, the effective operating posi
4. In a switch of the class described, a base
member having two spaced contacts thereon, a
tions of the switch, as well as the non-operating
or safety “oli” position of said switch, are auto
cap mounted on the base member for movement
toward and away from said contacts and for ro
matically determined upon rotation oi the switch
manipulating cap, thereby eliminating guessing on
tation relatively to said base member, resilient
means interposed 4between said cap and said con
the part of the operator. The present invention u) tacts for moving the cap away from the contacts
and for connecting the latter to complete an elec
also embodies novel circuit completing means, as
tric circuit upon movement of said cap toward
the contact strips 40 and 4l, which also serve as
said contacts, and cam means controlling the
the means for moving the switch manipulating
movement of the cap toward and away from the
-cap to circuit breaking position.
,
-' Although only a single embodiment of the in .15 contacts through rotation of said cap.
5. In a switch of the class described, a base
vention has been illustrated and described in the
member having two spaced contacts thereon, a
foregoing specification, it is to be expressly7
cap mounted on the base member for movement
understoodv that changes may be made therein,
toward and away from said contacts and for ro
'particularlyvin the design and arrangement of the
parts illustrated, without departing from the 20 tation in opposite directions to two predetermined
positions, resilient means interposed between said
cap and said contacts for moving the cap away
from the contacts and for connecting the latter
to complete an electric circuit upon movement of
spirit and scope of the invention, as will now be
clear to those skilled in the art. For a definition
of the limits of the invention, reference is had
primarily to the appended claims.
4
What is claimed is:
25 said cap toward said contacts, and cam means on
l.. In a switch of the class described, a base
member having two spaced contacts thereon, a
cap mounted on said base member for movement
toward and away from said contacts, and resil
ient means secured to one of said contacts and
extending therefrom toward the other of said con
tacts and into engagement with said cap, move
ment of the cap toward the contacts being effec
tive to engage said means with the other of said
spaced contacts to complete an electric circuit, ‘
said resilient means comprising two superposed
strips, one of said strips extending upwardly from
said iirst-named contact into engagement with
said cap and downwardly from the latter toward
and above the other of said contacts, and the other
of said strips extending toward and above said
other contact and spaced from said first-named
strip and having its free end bent upwardly for
engagement with the free end of said ñrst-named
strip.
`
2. In a switch of the class described, a base
the cap for controlling the movement thereof to
ward and away from the contacts and for control
ling the rotation of said cap to said positions.
6. In a switch of the class described, a base
member having two spaced contacts thereon, a
cap mounted on the base member for movement
toward and away from said contacts and for ro
tation in opposite directions to two predetermined
positions and to a third predetermined position
intermediate said ñrst named positions, resilient
means interposed between said cap and said con
tacts for moving the cap away from the contacts
and for connecting the latter to complete an elec
trie circuit upon movement of said cap toward
said contacts, and cam means on the base member
and the cap for controlling the movement of the
latter toward and away from the contacts and for
controlling the rotation of said cap to said posi'
tions.
"7. In a switch of the class described, a base
plate of non-conducting material having a boss
on the upper face thereof, two spaced metal con
member having two spaced contacts thereon, a
cap mounted on said base member for movement
facts extending above said boss and through the
latter and said base plate, a cap of non-conduct
toward and away from said contacts, and resil
ient means for moving the cap away from the £10 ing material disposed over the contacts and sur
contacts and for connecting the latter to complete
rounding said boss, and resilient means interposed
an electric circuit upon movement of said cap
between said boss and said cap for moving the
toward said contacts, comprising two superposed
latter away from the contacts and for connecting
strips having corresponding ends secured to one
said contacts to complete an electric circuit upon
of said spaced contacts and opposite extreme ends - movement of the cap toward `said contacts, com
prising two superposed metal strips having cor
engaged with each other, and being spaced apart
responding ends secured to one of said spaced
intermediate the ends thereof.
contacts and opposite extreme ends engaged with
3. In a switch of the class described, a base
each other, and being spaced apart intermediate
member having two spaced contacts thereon, a
the ends thereof.
cap mounted on said base member for movement
8. In a switch of the class described, a base
toward and away from said contacts, and resil
plate of non-conducting material having a boss
ient means interposed between said cap and said
on the upper face thereof, two spaced metal con
contacts for moving the cap away from the con-tacts extending above said boss and through the
tacts and for connecting the latter to complete an
latter and-said base plate, a cap of non-conduct
electric circuit upon movement of said cap toward
ing material disposed over the contacts and sur
said contacts, said resilient means comprising
rounding said boss, resilient means interposed
two superposed strips having corresponding ends
between said .boss and said cap for moving the
secured to one of said contacts, one of said strips
latter away from the contacts and for connect
‘extending upwardly from said last-named con
tact and over the latter into engagement with said i) -ing said contacts to complete an electric circuit
upon movement of the cap toward said contacts,
.cap and downwardly from said cap toward and
comprising two superposed metal strips having
above the other of said contacts, and the other
corresponding ends secured to one of said spaced
of said strips extending over said iirst-named con
tact and substantially at right angles to the latter
to and above said other contact, said last-named
contacts and opposite extreme ends engaged with
.each other, and being spaced apart intermediate
2,405,035
3
the ends thereof, and cammeans of non-conduct
ing material for controlling the movement of the
above said rotatable disc in spaced relationl there
with, said ñXed disc being formed with twor dia
metrically opposite downwardly projecting lugs
cap toward and away from the contacts.
9. A switch mechanism comprising a base hav
adapted to engage said cam surfaces and effect
ing two spaced contacts thereon, a rotatable disc Us downward movement oi said rotatable disc upon
mounted on said base for relative rotary and
rotation of the latter to one of said end positions,
`linear movements, a disc fixed on said base in
and to engage said shoulders and said recesses
superposed relation with said rotatable disc,
upon rotation of said rotatable disc to the other
means on one of said discs providing two di
of said end positions and to said third position,
ametrically opposite cam surfaces, means on the 10 respectively, means for rotating said rotatable
other of said discs and engaged with said cam
disc, resilient means for biasing said rotatable
surfaces for effecting linear movement of said ro
disc upwardly toward said iixed disc and for con
tatable disc upon rotation of the latter, means for
necting said contacts to complete an electric cir
rotating said. rotatable disc, and resilient means
cuit upon downward movement of said rotatable
for biasingy said rotatable disc toward said ñxed
disc, and means on the underside of said rotat
disc~ and for connecting said contacts to com
able disc and engaged with said base for hold
plete an electric circuit upon linear movement of
ing said disc against downward movement when
rotatable disc.v
said lugs are engaged with said shoulders.
10. A switch mechanism comprising a base
13. A switch mechanism comprising a base
having two spaced contacts thereon, a rotatable 20 having two spaced contacts thereon, a rotatable
disc mounted on said base for relative linear
disc mounted on said` base for relative rotation in
movement and for rotation in opposite directions,
opposite directions to two end. positions and for
said disc being formed on one side thereof with
relative upward and downward movements, said
twoy diametrically opposite cam surfaces inclined
disc being formed on the top side thereof with
in the same direction and terminating in two
two diametrically opposite cam surfaces inclined
diametrically opposite shoulders, a disc ñxed on
in the same direction and terminating in two di
said base and having two diametrically opposite
ametrically opposite shoulders, a disc ñxed on
lugs adapted to engage said cam surfaces to ef
said base and disposed above said rotatable disc
fect linear movement oi said rotatable disc upon
in spaced relation therewith, said fixed disc hav
rotation of the latter in one of said directions
ing two diametrically opposite downwardly pro
and to engage said shoulders to limit the extent
jecting lugs adapted to engage Said cam sur
of rotation of said rotatable disc in the other of
faces and effect downward movement of said ro
ksaid directions, means for rotating said rotatable
tatable disc upon rotation of the latter to one of
disc, and resilient means for biasing said rotat
said end positions and to engage said shoulders
able disc toward said ñxed disc and for connect
upon rotation of said rotatable disc to the other
ing said contacts to complete an electric circuit
of said end positions, means for rotating said ro
upon linear movement of said rotatable disc.
tatable disc, resilient means for biasing said ro
A switch mechanism comprising a base
tatable disc upwardly toward said fixed disc and
having two spaced contacts thereon, a rotatable
for connecting said contacts to complete an
disc mounted on said base for relative rotation
electric circuit upon downward movement of said
in opposite directions to two end positions and to
rotatable disc, and means for limiting the extent
a third position intermediate said end positions
of rotation of said rotatable disc to said ñrst
and for relative upward. and downward move
named end position and for holding said rotat
ments, said disc being formed on the upper side
able disc against downward movement when the
thereof with two diametrically opposite cam sur
latter is rotated to said second-named end po
faces terminating in two diametrically opposite
sition and said lugs are engaged with said shoul
shoulders and provided intermediate the ends
ders, said last-named means comprising two di
thereof with two diametrically opposite recesses,
ametrically opposite cam surfaces formed on said
a disc iixed on said base and disposed above said
base inclined in the same direction as said ñrst
rotatable disc in spaced relation therewith, said I
named cam surfaces and terminating in two di
ñxed disc being‘formed with two diametrically
ametrically opposite shoulders, and two diamet
opposite downwardly projecting lugs adapted to
rically opposite downwardly projecting lugs
engage said cam surfaces and effect downward
formed on the underside of said rotatable disc
movement of said rotatable disc upon rotation
of the latter to one of said end positions and to
and adapted ?to engage said shoulders when said
rotatable disc is rotated to said ñrst-named end
position and to engage said cam surfaces adja
cent said shoulders when said rotatable disc is
rotated to said second-named position.
14. A switch mechanism comprising a base
member having an upwardly extending circular
boss thereon, a, rotatable disc engaged over said
boss and having two diametrically opposite cam‘
engage said shoulders and said recesses upon ro
tation of said rotatable disc to the other of said
end positions and to said third positiony respec
tively, means for rotating said rotatable disc, and
resilient means for biasing said rotatable disc
upwardly toward said ñxed disc and for connect
ing said contacts to complete an electric current
upon downward movement of said rotatable disc.
l2. A switch mechanism comprising a base
having two spaced contacts thereon, a rotatable
disc mounted on said base for relative rotation
in opposite directions to two end positions and
to a third position intermediate said end posi
tions and for relative upward and downward
movements, said disc being formed on the upper
side thereof with two diametrically opposite cam
surfaces terminating in two diametrically oppo
site shoulders and provided intermediate the
ends thereof with two diametrically opposite re
to engage said shoulders upon rotation of said
rotatable disc in the opposite direction, a cap
engaged over said fixed disc and said boss and
secured to said rotatable disc for rotating the
cesses, a disc íixed on said base and disposed '
latter, two spaced contacts carried by said boss
surfaces on the upper side thereof inclined in
the same direction and terminating in two di
ametrically opposite shoulders, a disc fixed on the
upper end of said boss and having two diametri
caliy opposite downwardly projecting lugs there
on adapted to engage said cam surfaces and
effect downward movement of said rotatable disc
upon rotation of the latter in one direction and
, 2,405,035
and projecting above said ñxed disc, and resil
16. A switch mechanism comprising a base
ient means disposed between said fixed disc and
member having an upwardly extending circular
said cap for normally biasing the latter to raised
boss and two diametrically opposite cam surfaces
position and holding said rotatable disc in en
surrounding said boss inclined in the same direc
gagement with said lugs and for connecting said Ul tion and terminating in two diametrically oppo
contacts to complete an electric circuit upon
site shoulders, a rotatable disc engaged over said
downward movement of said cap and said rotat
boss and rotatable in opposite directions to two
able disc.
end positions, said disc being formed on the upper
15. A switch mechanism comprising a base
side thereof with two diametrically opposite cam
member having an upwardly extending circular
surfaces inclined in the same direction as said
boss thereon, a rotatable disc engaged over said
boss and rotatable in opposite directions to two
end positions and to a third position interme
diate said end positions, said disc being formed
on the upper side thereof with two diametrically
opposite cam surfaces inclined in the same
direction and terminating in two diametrically
opposite shoulders and provided intermediate the
ends thereof with two diametrically opposite re
first-named cam surfaces and terminating in two
diametrically opposite shoulders, a disc fixed on
the upper end of said boss and having two di
ametrically opposite downwardly projecting lugs
thereon adapted to engage said second-named
cam surfaces and effect downward movement of
said rotatable disc upon rotation of the latter to
one of said end positions and to engage said
second-named shoulders upon rotation of said
cesses, a disc fixed on the upper end of said boss 20 rotatable disc to the other of said end positions,
and having two diametrically opposite down
wardly projecting lugs adapted to engage said
cam surfaces and effect downward movement of
two diametrically opposite downwardly project
and projecting above said ñxed disc, and resil
said fixed disc, and resilient means disposed be
tween said ñxed disc and said cap for normally
ing lugs on the lower side of said rotatable disc
adapted to engage said first-named shoulders
said rotatable disc upon rotation of the latter to
when said rotatable disc is rotated to said first
one of said end positions and to engage said
named end position and to engage said first
shoulders and said recesses upon rotation of said 25 named cam surfaces adjacent said shoulders
rotatable disc to the other of said end positions
when said rotatable disc is rotated to said second
and to said third position, respectively, a cap en
named end position, a cap engaged over said
gaged over said fixed disc 4and said boss and se
iixed disc and said boss and secured to said rotat
cured to said rotatable disc for rotating vthe
able disc for rotating the latter, two spaced con
30
latter, two spaced contacts carried by said boss
ient means disposed between said fixed disc and
tacts carried by said boss and projecting above
said cap for normally biasing the latter and said
biasing the latter and said rotatable disc to
rotatable disc to raised positions and for con
raised positions and for connecting said contacts
35
necting said contacts to complete an electric cir
to complete an electric circuit upon downward
cuit upon downward movement of said cap and
movement of said cap and said rotatable disc.
said rotatable disc.
DWIGHT L. HARFORD.
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