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Dec. 3, 1946.
Filed Nov. 9, 1943
Z\I/ \/ V/A
6y his attorney-s
Patented Dec. 3, 1946
N-ITED s'raras
Robert H. Bentley, Hartiord, @onn, assignor to
The Arrow-Hart & Hegeman Electric (3cm
pany, Hartford, Coma, a corporation of 6on
Application November 9, 1943, Serial No. biitttii?i
4 i’llaims. (Cl. 200-76)
This invention relates to snap action electric
switch mechanisms. ‘ More particularly, it relates
to a mechanism suitable for multi-pole electric
switches wherein it is desired to break simu1~
taneously each of the multiple lines controlled
by the switch.
It is an object of my invention to provide
an improved electric switch mechanism particu=
larly adapted for use in multi-pole electric
switches of low alternating current ratings.
Another object of the invention is to provide
an improved switch mechanism which will cause
simultaneous break in all the lines controlled by
the switch and which may be economically con
structed and-assembled.
Another object of the invention is to provide
an economical structure for an electric switch
of small size for use in multi-circuit arrange
ments, in which the breaks in all of the lines
shall occur simultaneously and which will have
a substantial interrupting capacity in compari
son to its small size.
Other objects and advantages of my invention
will become apparent as it is described in corn
is normally spring-pressed upwardly into engage
ment with the fixed contacts by coiled compres
sion spring at between the bridging contact and
the bottom of the cavity.
In order to insulate the bridging contact from
the mechanism ‘for operating it to open circuit
position, an insulating plunger member at, pref
erably made of molded insulating material, rests
upon the top surface of each bridging contact
and is guided in its movement by channels
formed in the side walls oi’ the base and of the
partitions l3 and is.
Because the several sets of fixed and movable
contacts are individual units and ordinarily
would not be dependent on one another for
movement in unison, it has been found needful
to provide actuating mechanism for causing
simultaneous opening and closing movement of
the contacts in order to avoid excessive arcing
between the contact surfaces. To accomplish
this object, I have provided a frame or contact~
moving member made up of three similar parallel
stamped sheet metal ribs 5b,
having laterally-directed arms 56a, 52a, blia at
nection with the accompanying drawing.
25 their ends. These arms are each provided with
In the drawinga pair of small neighboring apertures through
Fig. 1 is a longitudinal section view through
which pass parallel pins 5t, 58, which are, or may
the center of an electric switch mechanism em
be, soldered or otherwise amxed to the arms of
the ribs 58, 52, 54% to form a rigid unit. Between
Fig. 2 is a section view similar to Fig. 1, but 30 the neighboring pins 55, 58 the ends of a leaf
spring member 6b are inserted.’ This member
with parts in closed-circuit position;
60 may be stamped from thin resilient sheet metal
Fig. 3 is a transverse section view, the section
being taken along line 3-3 of Fig. 2;
in the form indicated best in Fig. 6. To ac
Figs. 4, 5 and 6 show, in exploded perspective,
commodate the arms 50a, 52a, 54a, slots 62 may
certain parts of the mechanism for operating 35 be cut into the end edges of the leaf spring mem
her. It may thus be observed that the leaf
the movable contact.
Referring to the drawing, the switch contacts
spring and the frame or contact-moving member
bodying the invention;
' and terminals are mounted within a rectangular
molded insulating base 10 hollowed out for the
, I form a contact operating unit.
In order that an over-center action may be
reception of three identical sets of contacts 40 produced, the leaf spring member 60 has an
H-shaped slot 64 stamped in its central portion
located in parallel chambers l2, l4, 16, which
are separated by longitudinally extending parti
providing two short arms 88 whose ends engage
tions- I3 and I 5 formed integral with the base.
in a circumferential groove formed near the end
Each of the contact sets comprises a pair of
of an actuator in the form of an operating pin
?xed stamped bar contacts 20, 22 secured upon 45 or plunger member 10. _ To bow the arms 66 and
ledges 24, 25 at opposite ends of the base by
give the leaf spring a bias, the diameter or thick
ness of the portion or the plunger 10 engaged
hollow internally-threaded rivets 28 which pro
by the arms 68 is greater than the distance be~
ject through the bottom of the base to receive
tween the ends of the arms 66 in their normal
terminal screws 30. Each of the ?xed contacts
20, 22 extends into a cavity such as He in the 50 ?at aligned state.
central part of each of compartments l2, l4 and
At the central portions. of the ribs 50, 52 and
M, cylindrical studs 50s, 52s, 54s are a?lxed.
I6, and has a conventional highly-conductive
The studs 50s and 54s extend laterally inwardly
button-like contact tip facing downwardly into
from one side of the ribs 50 and 54, and the stud
the cavity for engagement with similar contact
‘ tips on a movable bridging contact bar 38 which 56 I23 extends from both sides 01’ the rib 52. These
studs are aligned and are adapted to seat with
in the insulating plungers 42 so that upon move
ment of the frame, the plungers will be caused
to simultaneously move downwardly to cause the
bridging contacts to disengage the ?xed con
tacts simultaneously.
To guide rectilinearymovement of the plunger
Ill, a diametrical slot 12 is cut into the inner
end of the plunger to receive short guide pins
14 radially extending inward from the walls of a
central aperture ‘I6 formed in a‘ rectangular cover
member 18 for the base I0. The cover member
moving member acting upon said bridging con
tacts to move them simultaneously, a'leaf spring
member having an H-shaped aperture providing
resilient portions for providing a bias of said
spring member into one or another of two condi
tions, said leaf spring member engaging at its
ends with said contact-moving member, and an
operating pin engaged by said resilient portions
for changing the direction of bias of said leaf
spring‘ member.
2. In an electric switch, a casing, a plurality of
?xed and movable contacts therein, a'contact
moving member acting upon, said movable con
tacts to move them simultaneously, a leaf spring
ing material and‘hollowed out on its inner sur
face. for the reception of- the operating mecnas 15 member cooperating at its’ends with said con
tact-moving member and having positions of op
posite bias for locating said contact-moving
Normally urging the plunger outward of the
cover 18 is a compression spring 82 coiled around _‘ member in spaced positions, means in the bottom
of said casing supporting said contact-moving
the'plunger. One end of this spring 82 presses
member during change of bias direction.
against the under side of a ?ange ‘H formed on
means in the top of said casing supporting said
the upper and outer end of the plunger 10; the
contact-moving member during'change of bias
opposite end of the spring presses upon the
in the other direction, and a manually operable
floor of a circular recess 84 in the cover concen
tric with the plunger-receiving recess ‘I6. The
actuator for changing said bias.
recess 84 preferably will be the same diameter
3. In an electric switch, a casing, a plurality
as the inner ?anged end of I an insulating button '
of ?xed and movable contacts therein, said mov
80 that covers and insulates the outer end of
able contacts being independently movable, a
the plunger ‘it. The ?anged end of the button
contact-moving member acting upon said mov
Bll may be secured in the recess 84 by a stamped
able contacts to move them simultaneously, a
sheet metal bridge member 86; and the bridge 30 leaf spring member cooperating at its ends with
member 86 may be secured to the cover by '
said contact-moving member and having posi
through-bolts (not shown) which may, if desired,
tions of opposite bias for locating said contact
also serve the additional purpose of holding the
moving member in spaced positions, means in the
cover and base together.
bottom of said casing supporting said contact
In operation, depression of the button 80 and
_moving member during change of bias in one,
plunger ‘It overcomes the spring 82, bending the‘
direction, means in the top of said casing sup
leaf spring arms 66 through the plane of the
porting said contact-moving member during
leaf spring member 50 from the position of Fig.
change of bias in the other direction, and an
1 to that of Fig. 2. This change of state of the
actuator manually operable in one direction to
leaf spring carries the frame ribs 50, 52, 663 up-I 40 change said bias, and spring means operating
wardly, allowing the contact biasing springs 659
said actuator to change said bias in the other
to move the bridging contacts 38 into engage
‘ ment with the stationary contacts 22, 2Q.
4. In an electric switch, a casing, aplurality
' Release of the button 80 will permit the re-'
of ?xed and movable contacts therein, said mov
turn spring 82 to reverse the condition of spring
able contacts being independently movable, a
arm 66, forcing the frame down and overcoming
contact operating unit comprising a contact
the lesser force of contact springs 50 to move the
moving member acting upon said movable con
vbridging contacts to open position.
ta'cts to move them simultaneously and a leaf
18 may‘conveniently be made of molded insulat
Many modi?cations within the scope of the
spring member engaging at opposite end portions
invention will occur to those skilled in the art.
Therefore I do not limit the invention to the em
with said contact-moving membenan actuator
engaged by stressed portions of said leaf spring
member to provide bias in opposite directions for
bodiment disclosed.
I claim:
1. In an electric switch, a plurality of inde
' pendent sets of ?xed and movable contacts each
comprising a pair of ?xed contacts and a bridg
ing contact, spring means biasing said bridging
contact into closed circuit position, in combina
tion with actuating means comprising a contact
locating said unit in different positions, means
in the bottom of said casing supporting said
contact-moving member during change of bias in
one direction, and means in the top of said casing
supporting said contact-moving member during
change of bias in the other direction.
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