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Патент USA US3019318

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Jan. 30, 1962
G. s. ELLITHORPE
3,019,308
ELECTRIC SWITCH
Filed July 51, 1957
2 Sheets-Sheet 1
$5
45,13 39
39
INVENTOR.
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Jan. 30, 1962
G,'S. ELLITHORPE
ELECTRIC SWITCH
Filed July 31, 1957
W
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3,019,308
2 Sheets-Sheet 2
66 #1
Q? 67
67
INVENTOR.
iii-m :2 WM.
United States Patent 0 i "ice
7
3,019,308
Patented Jan. 39, 1952
9
1
hi
end of the base member 11 and is held in place on the
3,019,308
ELECTRIC SWITCH
Gilbert 5. Ellithorpe, Waterman, Ilh, assignor to Littel
fuse, Incorporated, Des Plaines, 111., a corporation of
Illinois
base member 11 by ?ngers 17 struck therefrom and
clinched over the ?ange '15 of the base member 11.
The bracket 16 is provided with a pair of ears 18 pro
vided with holes 19 for mounting the electric switch.
One of the ears 18 is provided with an extension 20 to
which is secured a clip 21 by a screw 22 for holding
wires leading to the contacts of the electric switch.
This invention is directed generally to electric switches
The closed end wall 14 of the base member 11 is pro
and more particularly to‘ a rotary type multiple position 10 vided with a rectangular slot 25 anda communicating
electric switch.
.
opening 26 for receiving a ?rst contact member 27.
The principal object of this invention is to provide an
This contact member 27 after being inserted in the rec
improved electric switch wherein a rigid contact bar or
tangular slot 25 is clinched over as illustrated in FIG.
contactor member is laterally moved in an operating
3 to hold the same in place, the contact member 27 be
plane with respect to contacts for performing the switch 15 ing interiorly provided with a ?at surface 28 forming a
ing function and wherein the contact bar or contactor
?rst contact. The outer end of the contact membery27
member is also moved normal to said operating plane
extends outwardly to form a terminal connection. The
for lowering and raising the same into and out of en
end wall 14 of the insulating base 11 is provided with
Filed July 31, 1957, Ser. No. 675,349
6 Claims. (Cl. 200-11),
gagement with the contacts as the contact bar or con
a second rectangular slot 29 and a communicating open‘
tactor member is moved in said operating plane. This 20 ing 30 for receiving a second contact member 31. The
provides a quick make and break action and also a wip
contact member 31 is also inserted throughthe slot 29
ing action to minimize arcing and pitting of the con
and is secured in place by clinching the same over on
tacts, to eliminate deterioration of the insulation ad
the end wall 14. The inner end of the contact member
jacent the contacts, to maintain the contacts clean and
31 carries a ?rst contact 32 and the outer end thereof
operative, and to increase the expected life of the switch. 25 extends outwardly for forming a terminal connection.
In accordance with this invention, the movement of con
The end wall 14 of the insulating base 11 is also pro
tact bar or contactor member in a direction normal to
the operating plane of movement thereof is simply and
inexpensively accomplished by cam means engaged by
the contact bar or contactor member.
Further objects of this invention reside in the details
of construction of the electric switch and in the'coop
erative relationships between the component parts there—
vided with a third rectangular slot 33 and a communi
cating opening 34 for receiving a third contact member
35. Here, also, the third contact member 35 is inserted
30 through the rectangular slot 33 and is clinched in place
on the end wall 14.
The inner end of the contact mem
ber 35 carries a third contact 36 and the outer end there
of extends outwardly to form a connecting terminal.
'
The communicating openings 26, 30 and 34 communi
Other objects and advantages of this invention will 35 cating with the rectangular slots 25, 29 and 33 are pro
of.
becomeapparent to those skilled in the art upon refer
ence to the accompanying speci?cation, claims and draw
vided for the purpose of facilitating insertion of the con
tact members 27, 31 and 35 in the end wall 14. The
ings in which:
?rst, second and third contacts 28, 32 and 36 respec
FIG. 1 is a perspective view of the electric switch of
tively, are laterally arranged in a common plane and
40 are laterally spaced from each other.
this invention ‘looking from one end thereof;
FIG. 2 is an end elevational view of the electric switch
Arranged within the cavity 12 of the insulating base
member 11 is a carrier member 38 which is also pref
looking from the other end thereof;
FIG. 3 .is a vertical sectional view through the elec
erably made of electrical insulating material such as
tric switch taken substantially along the line 3—-3 of
Bakelite or the like. This carrier member 38 is provided
45 at its lower end with a cylindrical portion 39 which is
FIG. 2;
\
journalled for rotation in the cylindrical cavity portion
FIG. 4 is an exploded perspective view of the contact
bar and the carrier member which is utilized in the elec
13 of the insulating base 11. Thus the carrier member
39 may be rotated in a plane which is parallel to the
tric switch illustrated in FIGS. 1 to 3;
plane including the contacts 28, 32 and 36. The carrier
FIG. 5 is a perspective view of the mechanism for ro
tating the carrier member;
member 38 is also slidably carried by the insulating
base member 11 for movement in a direction normal to
FIG. 6 is ‘a vertical sectional view through the electric
said plane. Adjacent its upper end, the carrier member
switch taken substantially along the line 6—6 of FIG. 3‘;
38 is provided with a slot 40 which is utilized for the
FIG. 7 is a partial sectional view similar to FIG. 6,
purpose of rotating the carrier member. The carrier
but illustrating the carrier member in a different position;
FIG. 8 is a vertical sectional view taken substantially 55 member 38 is also provided with a pair of side faces 41
and with a fulcrum portion 42 arranged between the
along the line 8~—8 of FIG. 7;
side faces 41. The lower end of the carrier member
FIG. 9 is a substantially horizontal sectional view
38 is also provided with a notch 43. A hole 44 is pro;
taken substantially along the line 9--9 of FIG. 6; and
vided in the carrier member 38, the. hole 44 opening
FIG. 10 is a substantially horizontal sectional view
60 into the face of the carrier 38 which is opposite from
taken substantially along the line 10—10 of FIG. 6.
the face carrying the fulcrum portion 42 and the notch
Referring ?rst to FIGS. 1 to 3, the preferred form of
43.
the electric switch of this invention ‘is generally desig
A rigid contact bar or contactor member 46 is ar
nated as 10 and it is shown to be a rotary type, mul
ranged between the carrier ‘member 38 and the closed
tiple-position electric switch. It includes a hollow base
member 11 formed of electrical insulating material such 65 end 14 of the insulating base member 11. This contact
bar 46, as here illustrated, is made of electrically con
as Bakelite or the like. The base 11 has a cavity 12
ductive material, such as brass or the like, and is pro
which is substantially pie-shaped in con?guration. The
smaller end of cavity 12 is provided with circularly
shaped cavity 13. One end, 14, of the hollow base
vided with a recess‘ 47 which engages over the fulcrum
portion 42 of the carrier member 38 so that the contact
member 11 is closed by an end wall and the other end 70 bar 46 is pivotally mounted with respect to the carrier
member 38 for movement in a direction normal to the
is open. The open end of the base member 11 is pro
vided with a ?ange 15 and a bracket 16 closes the open
plane containing the contacts 28, 32 and 36. The con
3,019,308
3
4.
tact bar 46 is provided with a pair of ears 48 which
engage the side faces 41 of the carrier member 38 and
into engagement with the second contact 32 as the con~
tact bar 46 is rotated into the second position. During
this movement, the contact 51 is lowered into engage
ment with the contact 32 and the follower 52 is lifted
otf of the cam surface 63 when the contact 51 engages
with an ear 49 which engages in the notch 43 in the car~
rier member 38. By reason of this construction, the
contact bar 46 is rotated in an operating plane which is
parallel to the plane containing the contacts 23, 32 and
36 when the carrier member 38 is rotated and by reason
of the fulcrum or pivotal connection between the car
rier member 3% and the contact bar 46, the contact bar
46 may be pivoted in a direction normal to the operat
the contact 32. This provides a positive “make” of the
contacts. Continued movement in the operating plane‘
to the ultimate second position causes the contact 51 to
slide on the contact 32 to provide a wiping contact action.
There is thus provided a positive making of the contact
ing plane. The contact bar 46 is provided with a dimple
along with a wiping action. Likewise as the contact bar‘
50 which forms a contactor which continuously engages
the ?rst contact 28 to provide an electrical connection
between the ?rst contact 28 and the contact bar 46.
46 is being moved from the second position to the ?rst,
or intermediate position, the contact 51 is raised out of
The contact bar 46 also carries a contact or contactor 51 '
which is moved to a ?rst or intermediate position be“
tween the contacts 32 and 36, or a second position where
it engages the contact 32, or a third position where it
engages the contact '36. Thus, when the contact bar 46
is in the ?rst or intermediate position, the electrical cir
cuits are broken and when the contact bar 46 is moved
to the second position, a circuit is completed between
the contact members 27 and 31 and when the contact
bar 46 is moved to the third position, a circuit is com
plete between the contact member 27 and the contact
member. 35. The upper end of the contact bar 46 is also
provided with a cam follower means 52 which is adapted
to engage a cam means 65 formed on the end wall 14 of
the insulating base member 11 for moving the contact
engagement with the second contact 32. This movement
of the contact 51 in the operating plane and in a direc
tion normal to the operating plane provides a quick make
and break action and also a wiping action between the
contacts 51 and 32. This minimizes arcing and pitting
of the contacts, eliminates deterioration of the insulation
adjacent to the contacts and maintains the contacts clean
and operative at all times. When the contact bar 46 is
moved between the ?rst, or intermediate position, and
the third position where the contact 51 engages the con‘
tact 36, a similar action takes place and a further de*
tailed description is not considered necessary. The low
dwells 67 on the cam means 65 and the notch 69 in the
high dwell 66 operate effectively to maintain the contact
bar 46 in any one of its selected three positions. The
spring 62 at all times insures adequate contact pressure
bar 46 in a direction normal to the operating plane as 30 and also allows movement of the carrier member 38 and
pivotal movement of the contact bar 46 in a direction
normal to the operating plane of the contact bar 46. I
_ The electric switch of this invention is operated by a
In order positively to assure positive positioning of the‘
knob 54 secured to a shaft 55 which is journalled for
the contact bar 46 is rotated in the operating plane.
rotation in a bearing 56 formed in the bracket 16. An
operating member 57 which is arranged between the can
rier member 38 and the bracket 16 is staked to the inner
contact bar 46 in any of its selected three positions, the
bracket 16 is preferably provided with three recesses 72,
end of thevshaft 55_as indicated at 58. The free end of
the operating member 57 is provided with a ?nger 59
which extends into the slot 40 in the carrier member 38.
61, the ball 61 engaging respectively in the recesses 72,
tral notch 69. The cam means 65 are engaged by the
cam follower 52 formed on the upper end of the con~
tact bar 46. When the cam follower 52 of the contact
bar 46 is engaging the high dwell 66 of the cam means
and a second position where the contact bar engages the
second contact, a carrier member movable in a plane
73 and 74 which are adapted to be engaged by the ball
73 and 74 as the contact bar 46 is rotated to its ?rst, sec-'
0nd and third positions. While the electric switch of this
The axes of rotation of the shaft 55 and the carrier 38 40 invention has been speci?cally disclosed as a three-posi;
tion, rotary type electric switch, this invention is appli
are concentric and thus as the shaft 55 is rotated by
cable to electric switches having more or fewer posi—
manipulating the knob 54, the carrier member 38 is cor
tions and to electrical switches of the sliding or reciproi
respondingly rotated. The operating member 57 is pro‘
eating type as distinguished from the rotary type. ,
vided with a retaining hole 60 which receives a ball 61,
the ball 61 engaging the bracket 16. A spring 62 is 45 While for purposes of illustration, one form of this
invention has been disclosed, other forms thereof may
arranged in the hole 44 in the carrier member 38 between
become apparent to those skilled in the art upon reference
the carrier member 38 and the ball 61. The spring 62
to this disclosure and, therefore, this invention is to be
operates to press the ball 61 against the bracket 16 and
limited only by the scope of the appended claims.
to move the carrier member 38 toward the end wall 14
of the insulating base member 11. In so doing, the 50 ‘I claim as my invention:
1. An electric switch comprising an insulating base
spring 62 resiliently urges the contact bar 46 toward and
against the contacts 28, 32 and 36.
member, a ?rst contact carried by the base member, a
second contact carried by the base member and laterally
The cam means 65 formed on the front wall 14 of the
spaced from the ?rst contact, a rigid contact bar con
insulating base 11 is provided with a central high dwell
tinuously engaging the ?rst contact and laterally movable
66 and spaced low dwells 67 and cam surfaces 68
in an operating plane between a ?rst position Where the
therebetween, as shown more clearly in FIG. 9. The
contact bar is laterally spaced from the second contact
central high dwell 66 is preferably provided with a cen
65 and/or the notch 69 therein, the contact bar 46 is
pivoted rearwardly so as to retract the contact 51 from
parallel to said operating plane and in a direction normal
to said operating plane, means for mounting the contact
bar on the carrier member for movement thereby in said
operating plane and including means for pivotally mount
alignment with the contacts 32 and 36, this being shown
ing the contact bar for movement in a direction normal
in full lines in FIGS. 9 and 10. This represents the ?rst, 65 to said operating plane, spring means urging the carrier
or intermediate, position of the electric switch. When
member in a direction normal to said operating plane
the knob 54 is manipulated to move the contact bar 46
and hence said contact bar in said direction toward the
from the ?rst, or intermediate, position to the second
contacts, and cam means on the base member engaged
position, the cam follower 52 rides down the cam sur
face 68 toward the low dwell 67 as shown in broken line
by the contact bar for moving the contact bar normal to
said operating plane when the contact bar is laterally
Accordingly, when the contact bar 46 is 70 moved into and out of said second position ‘for lowering
rotated in its operative plane from the ?rst position to
and raising the contact bar into and out of engagement
ward the second position, the contact bar 46 is moved
with the second contact with a wiping action upon such
in a direction normal to the operating plane by the spring
lateral movement of the contact bar.
62 so as to lower the contact 51 of the contact bar 46 75
2. A multiple position electric switch comprising an
in FIG. 9.
3,019,308
5
6
insulating base member, a ?rst contact carried by the base
member, second and third contacts carried by the base
member and laterally spaced from each other and from
the ?rst contact, a rigid contact bar continuously engag
ing the ?rst contact and laterally movable in an operating
plane between a ?rst position where the contact bar is
and out of said second and third positions for lowering
and raising the contact bar into and out of engagement
with the second and third contacts with a wiping action
upon such lateral rotation of the contact bar.
5. A rotary type multiple position electric switch com
prising a hollow insulating base member closed at one
laterally arranged between and spaced from the second
end and open at its other end, a ?rst contact carried by
the closed end of the base member, second and third
contacts carried by the closed end of the base member
the contact bar engages the third contact, a carrier mem 10 and laterally spaced from each other and from the ?rst
contact, a rigid contact bar continuously engaging the
ber movable in a plane parallel to said operating plane
?rst contact and laterally rotatable in an operating plane
and in a direction normal to said operating plane, means
between a ?rst position where the contact bar is laterally
for mounting the contact bar on the carrier member for
arranged between and spaced from the second and third
movement thereby in said operating plane and including
means for pivotally mounting the contact bar for move 15 contacts, a second position where the contact bar en
gages the second contact, and a third position where
ment in a direction normal to said operating plane, spring
and third contacts, a second position where the contact
bar engages the second contact, and a third position where
means urging the carrier member in a direction normal
the contact bar engages the third contact, a carrier mem
to said operating plane and hence said contact bar in said
ber rotatably and slidably mounted in the base member
and rotatable in a plane parallel to said operating plane
direction toward the contacts, and cam means on the base
member engaged by the contact bar for moving the con
tact bar normal to said operating plane when the contact
bar is laterally moved into and out of said second and
third positions for lowering and raising the contact bar
into and out of engagement with the second and third
contacts with a wiping action upon such lateral movement
of the contact bar.
3. A rotary type electric switch comprising an insulating
base member, a ?rst contact carried by the base member,
and slidable in a direction normal to said operating plane,
means for mounting the contact bar on the carrier mem
ber for rotation thereby in said operating plane and in
cluding means for pivotally mounting the contact bar
for movement in a direction normal to said operating
plane, a bracket closing the open end of the base mem
ber, spring means interposed between the bracket and
the carrier member urging the carrier member in a di
rection normal to said operating plane and hence said
contact bar in said direction toward the contacts, cam
a second contact carried by the base member and laterally
spaced from the ?rst contact, a rigid contact bar con 30 means on the closed end of the base member engaged by
the contact bar for moving the contact bar normal to
tinuously engaging the ?rst contact and laterally rotatable
in an operating plane between a ?rst positionvwhere the
contact bar is laterally spaced from the second contact
said operating plane when the contact bar is laterally
rotated into and out of said second and third positions
for lowering and raising the contact bar into and out of
and a second position where the contact bar engages the
second contact, a carrier member rotatable in a plane 35 engagement with the second and third contacts with a
parallel to said operating plane and slidable in a direction
normal to said operating plane, means (for mounting the
contact bar on the carrier member for rotation thereby
in said operating plane and including means for pivotally
wiping action upon such lateral rotation of the contact
bar, and means rotatably carried by the bracket for ro
tating the carrier member.
6. A rotary type multiple position electric switch com
mounting the contact bar for movement in a direction 40 prising a hollow insulating base member closed at one
end and open at its other end, a ?rst contact carried by
normal to said operating plane, spring means urging the
the closed end of the base member, second and third con
carrier member in a direction normal to said operating
tacts carried by the closed end of the base member and
laterally spaced from each other and from the ?rst con
gaged by the contact bar for moving the contact bar nor 45 tact, a rigid contact bar continuously engaging the ?rst
plane and hence said contact bar in said direction toward
the contacts, and cam means on the base member en
' mal to said operating plane when the contact bar is later
ally rotated into and out of said second position for
lowering and raising the contact bar into and out of en
gagement with the second contact with a wiping action
upon such lateral rotation of the contact bar.
4. A rotary type multiple position electric switch com
prising an insulating base member, a ?rst contact carried
by the base member, second and third contacts carried
contact and laterally rotatable in an operating plane be
tween, a ?rst position where the contact bar is laterally
arranged between and spaced from the second and third
contacts, a second position where the contact bar on
gages the second contact, and a third position where the
contact bar engages the third contact, a carrier member
rotatably and slidably mounted in the base member and
rotatable in a plane parallel to said operating plane and
slidable in a direction normal to said operating plane,
by the base member and laterally spaced from each other
and irom the ?rst contact, a rigid contact bar continuously 65 means for mounting the contact bar on the carrier mem
ber for rotation thereby in said operating plane and in
engaging the ?rst contact and laterally rotatable in an
cluding means for pivotally mounting the contact bar
operating plane between a ?rst position where the contact
for movement in a direction normal to said operating
bar is laterally arranged between and spaced from the
plane, a bracket closing the open end of the base mem
second and third contacts, a second position where the
contact bar engages the second contact, and a third posi 60 ber, spring means interposed between the bracket and
the carrier member urging the carrier member in a direc
tion where the contact bar engages the third contact, a
tion normal to said operating plane and hence said con
carrier member rotatably and slidably mounted in the
‘ tact bar in said direction toward the contacts, cam means
base member and rotatable in a plane parallel to said
on the closed end of the base member engaged by the
operating plane and slidable in a direction normal to said
operating plane, means for mounting the contact bar on 65 contact bar for moving the contact bar normal to said
the carrier member for rotation thereby in said operating
plane and including means for pivotally mounting the
into and out of said second and third positions for low
contact bar for movement in a direction normal to said
ering and raising thecontact bar into and out of engage
operating plane, spring means urging the carrier member
operating plane when the contact bar is laterally rotated
ment with the second and third contacts with a wiping
in a direction normal to said operating plane and hence 70 action upon such lateral rotation of the contact bar, and
said contact bar in said direction toward the contacts,
means rotatably carriedby the bracket for rotating the
and cam means on the base member engaged by the con
carrier member, said bracket having three recesses there
tact bar for moving the contact bar normal ‘to said oper
in, and said spring means including a ball selectively re
ating plane when the contact bar is laterally rotated into 75 ceived in said recesses for ?xing rotation of said carrier
3,019,308
7
member and said contact bar in said three positions of
rotation.
v2,427,277
2,459,998
2,508,101
8
Hasselbaum _________ _'_; Sept. 9, 1947
Ellithorpe ___________ __ Ian. 25, 1949
Crowley ____________ __ May 16, 1950
‘References Cited in the ?le of this patent
,
2,647,180
Tregoning __________ __ July 28, 1953,
UNITED STATES PATENTS
5
2,675,436
Frerer '_ ________ __'_____ Apr. 18, 1954
312,494
377,574
Germany ____________ __ May 27, 1919
Germany ___________ __ June 22, 1923
1,900,236
1,908,204
2,291,249
2,297,652
FOREIGN PATENTS
Hall ________________ __ Mar. 7, 1933
Winning _____________ __ May 9, 1933
Nielsen ____________ __ July 28, 1942
Henry ______________ __ Sept. 29, 1942
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