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Патент USA US3099735

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July 30, 1963
A. J. GRENIER
3,099,725‘
ELECTROMAGNETIC SWITCHING ‘MECHANISM
Filed May 27, 1960
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July 30, 1963
A. J. GRENlEé
3,099,725
ELECTROMAGNETIC SWITCHING MECHANISM
Filed May 27. 1960
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July 30, 1963
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A. J. GRENIER
ELECTROMAGNETIC SWITCHING MECHANISM
Filed May 27, 1960
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ELECTROMAGNETIC swmams MECHANISM
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July 30, 1963
A. J. GRENIER
3,099,725
ELECTROMAGNETIC SWITCHING MECHANISM
Filed May 2'7, 1960
5 Sheets-Sheet 5
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Inventor,
Aim e’ J. G'rerzier,
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United States Patent‘ Office
1
3,099,725
3,099,725
Patented July 30, 1963.
2
_
with a spring-type bracket which, when in operative posi
tion about the respective projections, will secure and main
tain the cover member and casing, and the parts contained
thereby, in ?xed, operative position. Such a bracket (not
shown) is fully described and claimed in my copending
application, Serial No. 782,261, ?led December 22, 1958,
_
ELECTROMAGNETIC SWITCHING MECHANISM
Airné J. Grenier, North Attleboro, Mass., assign-or to
Texas Instruments Incorporated, Dallas, Tex., a corpo~
ration of Delaware
,
Filed May 27, 1960, Ser. No. 32,176
18 Claims. (Cl. 200—87)
now abandoned and in a co-pending continuation-impart
application thereof, Serial No. 53,586, ?led August 26,
This invention relates to new and improved electrical
switch structures, and more particularly, to a new and im
proved relay.
1960, which matured as US. Patent No. 3,061,258 on
10
One object of this invention is the provision of such a
switch structure, the component parts of which can be
October 30, 1962, which disclosure is incorporated herein
by reference.
Switch 20 includes a pair of stationary contacts 30 and
32 carried respectively by terminals 34 and 36, each of the
latter being formed of a suitably electrically conductive
rapidly and easily assembled into and retained in opera
tive condition.
15 material. Switch 20 also includes a third electrically con
Another object of the instant invention is the ‘provision
ductive terminal 38, formed of a suitably electrically con
of a new and improved plunger-armature type subassem
ductive material. Each of terminals 34, 36 and 38 are
bly which affords added weight to provide increased con
slidably received within, and respectively inter?t with
tact pressure and contact weld breaking force on drop out
open-ended guideway apertures 40, 42 and 44 provided in
without necessitating a deleterious or undesirable altera 20 casing member 22, (as best shown in FIGS. 3 and 11).
tion of the magnetic relationships between the armature
Each of apertures 40, 42 and 44 respectively include a
and the coil in the magnetic circuit.
pair of upstanding walls 45, 46; and 48, 50; 49, 51 which
A further object of this invention is the provision of a
inter?t with respectively adjacent side portions of termi
new and improved relay which affords increased contact
nals 34, 36 and 38. Upstanding walls 45, 46; 48, 50 and
pressure, minimizes contact bounce, vibration and arcing. 25 49, 51, each respectively include ‘sidewall projections 52,
Among the further objects of the invention are included
54; 56, 58 and 57, 59 which extend inwardly of casing
the provisions of a relay which is compact, simple in '
22 and respectively guide terminals 34, 36 and 38 for
design, versatile and susceptible to operation over a wide
slidable insertion thereof into casing 22. Each of side
range of current values, e?icient, low cost and easily
wall projections 52, 54; 56, 58 and 57, 59 also include in
manufactured and assembled into ?nal operative condi 30 wardly projecting and opposed boss or shoulder portions
tion.
60, 62; 64, 68 and 65. Terminals 34, 36 and 38 ‘are re
Other objects will be in part apparent and in part point
spectively supported on bosses 60, 62; 64, 68 and 65 and
ed out hereinafter.
,
are maintained in spaced relation with respect to interior
The invention accordingly comprises the elements and
surface 69 of casing 22, as best seen in FIGS. 7 and 9.
combinations of elements, features of construction, and 35 As best seen in FIGS. 3 and 11, each of apertured guide
arrangements of parts which will be exempli?ed in the
Ways 40, 42 ‘and 44 include pairs of recessed corner por
structures hereinafter described, and the scope of the
tions 70, which mate and inter?t with pairs of projections
application of which will be indicated in the following
72 respectively provided on each of terminals 34, 36 and
claims.
38 to limit the extent of inward insertion thereof into
In the accompanying drawings, in which one of the 40 casing 22.
various possible embodiments of the invention is illus
Each of terminals 34, 36 and 38 are also respectively
trated:
provided with an aperture 73, 74 and 76, within which
FIG. 1 is a top plan view of an electrical switch em
projections 78, 80 and 82 are respectively disposed. Pro.
bodying the present invention;
je'ctilons 78, 80 and 82 are ?xedly carried by cover member
45 24 and extend through the respective apertures 73, 74 and
FIG. 2 is a front elevational view thereof;
FIG. 3 is a view taken on line 3--3 of FIG. 2, with the
76 to facilitate alignment of the respective terminals and
cover removed for clarity of illustration;
casing member, maintain these parts in ?xed, assembled
FIG. 4 is a top plan view of a cover member for the
relation, and prevent longitudinal movement of the respec~
switch shown in FIG. 1;
vtive terminals within their respective apertured guideways.
FIG. 5 is a front elevational view of the cover member 50 sidewalls 45, 46; 48, 50 and 49, 51 and their respective
shown in FIG. 4;
‘
sidewall and shoulder projections, oo-olperate with the
respective adjacent side portions of terminals 34, 36 and
FIG. 6 is a bottom plan view of the cover;
FIG. 7‘ is a sectional view taken on line 7—7 of FIG. 2,
38, to prevent rotation iof these terminals about the axis
showing certain parts in dashed lines and in exploded
position;
55 Casing member 22 provides a recess in the formv of a
7
FIG. 8 is a sectional view taken on line 8—8 of FIG. 2,
showing certain parts in dashed lines in exploded relation;
FIG. 9 is a sectional view taken on line 9‘-—9 of FIG. 1;
FIG. 10 is a view similar to FIG. 9, showing the bridg
ing element and plunger subassembly in contactsaclosed 60
position; and
‘of their respective inter?tting projections 78, 80 vand 82.
'
socket 84, as best seen in FIG. 8, which inter?ts with
projection 82 carried by cover member 24, and loo-operates
therewith to align 'and maintain cover member 24 and
casing 22 in ?xed vassembled relation.
Referring rrow to FIGS. 4-6, cover member 24 includes
a plurality ‘of upstanding projections 90 and 92 which
FIG. 11 is an exploded perspective view of the electrical
respectively support projections 78 and 80. Projections
switch shown in FIG. 1.
90 and 92 are respectively slidably received ‘between pairs
Referring now to FIG. 1, an electrical switc'h embody
‘of upstanding opposed walls 94, 96 and 98, 100, provided
ing the instant invention is illustrated as being .generally 65 by casing 22, 'as‘ best seen in FIGS. 3 and 9. Cover mem
indicated by the reference number 20. Switch 20 takes
ber 24 further includes a plurality of transversely extend
the form of an electromagnetic relay and includes a casing
ing spaced shoulder portions 102, 104, 106, 108 and 110,
member 22 and a cover member generally referred to by
which inter?t with and rest on complementary shaped re
numeral 24, and best shown in FIGS. 4-6. Casing mem
icess portions provided in casing 22, so as to facilitate align
ber 22 includes beveled lands or projections 25 and 26, 70 ment of and maintain the cover member 24 and casing 22
and cover member 24 includes a boss or projection 27.
in relatively ?xed, assembled relation. It is to be noted
‘Projections 25, 26 and 27 are adapted to inter?t and mate
that cover member 24, because of the various projec
3,099,725
4
tions, i.e. 78, 80, 82, 90 land 92, and the plurality of
spaced shoulder portions advantageously preclude inad
ably of the type which has a variable spring rate, i.e.
vertent misorientation of the cover member and casing.
Casing 22 is provided with a cylindrical bore or cavity
pressive or de?ective state of the spring. It is intended
that the term “variable rate spring” include those types
of springs with which the force required for unit de?ec
tion of the spring increases with increased de?ection or
compression of the spring. The variable rate spring ad
vantageously permits operation of the relay over a wide
112, which is adapted to receive an armature and a non
magnetic slug or Weight of a plunger sub-assembly desig
nated generally by numeral ‘120 for reciprocal sliding
movement therein. The plunger subassembly thus in
the force required for compression varies with the com
cludes a twoppart plunger, one part comprising a magnetic
range of current values. By comparison, when a spring
armature and the other part comprising a non-magnetic 10 at a given uniform spring rate is employed, the relay
slug or weight, as will be described in greater detail below.
may, for example, operate satisfactorily at a low oper
As best seen in FIGS. 9-11, the plunger subassembly
ating current value. However, at a higher current value,
120 comprises a cylindrical plunger weight or armature
unsatisfactory performance might be encountered be
122 formed of a suitable magnetic material, such as, for
cause of such undesirable effects as high contact bounce,
example, SAE 1113 steel. Formed integrally with arma 15 chatter, etc. which would be experienced at this higher
ture plunger 122 is a shank 124 of considerably reduced
operating current value. These undesirable effects are
‘diameter. Shank 124 is provided with a beveled reduced
advantageously obviated, or at least minimized, by the
diameter portion 126 at its free end, and includes a 1'6
plunger subassembly of the instant invention. "Further,
cessed annularly extending shoulder portion 128.
An
the unique construction of the plunger subassembly thus
apertured movable bridging contact member 130 is slid‘ 20 far described, advantageously facilitates rapid subassem
ably mounted on shank portion 124. Bridging contact
lbly. 'All that is necessary to provide the plunger sub
member 130 includes a main body portion 132 and a
assembly 120 is to slidably place the bridging contact
pair of spaced contact arms 134 and 136. Fixedly mount
member about stem portion .124 and to slidably insert
‘ed and electrically connected to each of contact arms 134 ' spring 154 which quickly snaps into place with portion
and 136 is a pair of electrical contacts 140 and 142 which 25 1160 abutting shoulder portion 128.
are adapted to respectively mate with stationary contacts
The unique plunger subassembly of the instant inven
30 and 32. Bridging member 130 is preferably formed
tion further includes a separate weight or slug 162, as
of a high electrical conductivity material, such as a
best seen in FIGS. 9-1\l, for a purpose to be described
beryllium copper alloy. Selection of \a high conductivity
below. Slug or weight 162 may be formed of a diameter
material permits forming the bridging contact member 30 corresponding to that of armature or plunger 122 and
of a very thin gauge material, thereby maintaining the
may be formed of a non-magnetic material such as, for
weight of the bridging member at a minimum. Thus the
example, silicon bronze, brass, stainless steel, etc.
major portion of the weight of the plunger subassembly
Referring now to FIGS. 9 and ‘10', slug 162 and plunger
can operate to break apart contact welds.
or armature 122 are slidably received in the cylindrical
Contact arms 134 and 136 lie in 1a plane oifset from 35 cavity 112 provided by casing 22 as shown. Casing 22
the plane of the main body portion 132 of the element,
further includes an external cylindrical portion 168 and
as best seen in FIGS. 9, 10 and 11. Flexible upstand
a ?ange 170, which provides a spool for an energizing
coil >172. Disposed about cylindrical portion 168 is a
plurality of mutually insulated turns of electrically con
ing portions 146 [and 148, which interconnect the contact
‘arms 136 and 134 respectively with the main body por
tion, are adapted to ?ex. The ?exible nature of connect 40 ductive wire forming a coil 1172. As best seen in FIG.
ing portions 146 and 148 and the inherently resilient na
2, one end of coil 1172 is electrically connected to ter
ture of the bridging element, advantageously increases
minal 34 and the other end is electrically connected to
the tendency for contact wiping to clean the respective
terminal 38. Cylindrical spool portion 168 serves a dual
pairs of contacts 30, V140 and 32, 142 upon contact
closing.
v
'
Further, the offset nature of the contact ‘arms tends to
isolate each of the pairs of contacts 30, 140 and 32, 142
into separate “compartments” formed, ‘for example, respec
function of providing a spool for energizing coil 172
45 and also providing a housing and guide for armature
1-22 and slug or weight 162, and obviates the necessity
for other intricate and complex guiding members for the
‘ one-piece armature and stem.
Such features as nylon
tively by walls 94, 96 and 98, 100 of casing 22 on each of
bushings and stem guides which are ordinarily or con
opposite sides .of the plunger receiving Well or hollow por 50 ventionally required for proper guidance of the recipro
tion 112. Isolating the relative pairs on": contacts is advan
eating armature are advantageously eliminated by the
tageous for are shadow purposes in preventing the forma
arrangement of the instant invention.
tion of a low resistance current path which might be
When coil 172 is electrically energized, magnetic arma
formed by splatter or particles thrown off from the con
ture 122 will be moved upwardly in the direction of the
tacts, or by deterioration of other parts due to arcing, etc., 55 arrow, as shown in FIG. 10, to close the contacts 140, 30
in a manner well known. Contact arms 134 and 136, by
being of reduced width ‘(see FIG. 3) advantageously avoid
and 142, v312. Upon energization of coil 172, and upward
movement of armature portion 122, non-magnetic slug
physical contact with the side walls of the interior por
‘162 will also be moved upwardly in the direction of the
tion of casing 22, thus providing arc shadow and mini
arrow, as shown in FIG. 10. Non-magnetic slug 162
mizing the formation of a low resistance current short 60 uniquely and advantageously adds weight to the plunger
circuiting path and minimizing the possibility of undesir
subassembly so as to increase contact pressure respectively
able changes in calibration. Bridging contact member 130
between contacts 30’, ‘140 and 32, 142. The increase in
provides an aperture 150, as best seen in FIG. 9, within
weight a?orded by the non-magnetic slug 162 necessi
which shank portion 124 is loosely disposed.
tates a greater number of ampere turns to lift the arma
Circumferentially disposed about shank portion 124 is 65 ture and the additional weight, and thereby also effectively
a spring member \154 located intermediate the bridging
increases the contact pressures. Added weight 162 is
member 130 and the annularly extending shoulder por
cfurther advantageous in facilitating drop-out or opening
tion 128 adjacent the free end of shank 124. Spring 1'54
of contacts, and provides a greater force for breaking
urges bridging member 130 upwardly, as best seen in
welds which may (have formed between the respective
FIG. 9, into engagement with the lower surface 156 (see 70 pairs of contacts.
‘FIG. 10) of armature \122 and in a contacts-closing direc
Upon energization of coil 172, armature 122 and
tion. One end 158 of spring 154 engages the underside
weight 162 will move in the direction of the arrow from
of bridging member 1'30I land the opposite end 160 of
the contacts-open position shown in FIG. 9, to the
reduced diameter engages shoulder portion 128 of shank
contacts-closed position shown in FIG. 10. As the bridg
124, as best seen in FIGS. 9-—11. Spring 154 is prefer 75 ing element 130 moves upwardly su?iciently so that con
3,099,725
5
6
tacts ‘140-, 302 and 142, 32 mate, movement of the arm-a
ture 122 and the bridging element 130 will be momen
geously permits mass production of a variety of sub
assemblies which may be quickly and easily assembled
tarily or partially arrested. However, weight or slug 162
together in ?nal adjusted position.
because of its momentum, will continue to move upwardly
relative to the armature 122, as shown in the dashed line
Referring now to FIG. 11, wherein the switch is illus
trated in an exploded perspective view, it can be seen that
portions in ‘FIGS. 9 and 101. As the weight 162 momen
to assemble the switch in operative conditions, it is only
necessary to do the following:
(1) Slidably insert each of terminals 34-, 36 and 38 in
tarily leaves armature 122 thus temporarily relieving the
armature 122 from the burden of supporting this weight,
armature 122 will then again move upwardly under a
their respective aperture guideways.
temporarily increased net upward force on the armature. 10
(2) Drop or place slug 162 into cavity 112.
This temporary increased upward force on the armature
(3) Place or drop \armature 122 of the plunger sub~
(i.e. before the weight or slug 162 returns downwardly
assembly 120 (which is assembled in the manner de
to be again supported by the armature ‘122) advanta
scribed above, by slidably inserting bridging contact 130
geously increases contact pressure or contact sealing pres
sure at the time of contact making, and thereby mlini
15 stem 124 with end 160' of spring 154 snapping in place
mizes contact resistance, heat generation, and the tendency
of contact welding.
Further, the fact ‘that the weight or slug 162 tempo
rarily separates from the armature .122 by its continued
about stern 124 and slidably disposing spring 154- about
about shoulder 128 on stem 124).
(4) Once ‘the terminals, slug 162 ‘and plunger sub
assembly 120 are all in place in casing 22, it is now mere
ly necessary to insert cover member 24 into operative
stabilize the plunger subassembly to reduce vibration and
also to minimize contact bounce. Non-magnetic slug or
weight 162, after leaving armature 122, will continue to
position, as shown in FIG. 9, whereby projections 78,
80 and 82 will inter?t with their respective apertures in
terminals 34, 36 and 38 to ?rmly secure them in place.
(5) It is then only necessary to apply a mounting
move upwardly and strike the surface 180 at the upper
bracket, such as the one described in the aforementioned
movement upon contact making advantageously tends to
extremity of cavity 112 (see FIG. I1O). Thereafter, it 25 copending application, to ?rmly secure the assembled ap
will move downwardly into supporting engagement with
armature 122. Thus, slug 162- uniquely dissipates at least
paratus and maintain the same in ?nal assembled rela
tion.
part of the kinetic energy or momentum developed by
In view of ‘the above, it will be seen that the several
the plunger subassembly in moving from a contacts
objects of the invention are achieved and other advanta
open to a contacts-closed position, at least a part of which 30 geous results attained.
is absorbed by the casing when the slug 162 strikes sur
It is to be understood that .the invention is not limited
face 189. This partial energy dissipation advantageously
in its application to the details of construction and ar
obviates or at least minimizes contact chatter and bounce
and also vibration to which the plunger subassembly is
subjected.
The non-magnetic slug :162, in affording the unique and
unexpected results mentioned above, advantageously does
not necessitate an increase in relay dimensions or require
any deleterious alteration in the magnetic circuit or of
magnetic relationships between the armature 1124 and the
energizing coil 172. The height of the relay is main
tained at a minimum without affecting the magnetic circuit
of the relay.
rangement of par-ts illustrated in the accompanying draw
ings, since the invention is capable of other embodiments
and of being practiced or carried out in various ways.
Also it is to be understood that the phraseology or ter
minology employed herein is for the purpose of descrip
tion and not of limitation.
As many changes could be made in the above construc
tions Without departing from the scope of the invention,
it is intended that all matter contained in the above de‘
scription :or shown in the accompanying drawings, shall
be interpreted as illustrative and not in a limiting sense,
and .it is also intended that the appended claims shall
Cover member ‘24, as best seen in FIGS. 4, ‘8, 9, 10 and
111, includes a cylindrical hollow cavity 190 which receives 45 cover all such equivalent variations as come within the
the lower stern portion 124 and spring 154 of plunger
true spirit and scope of the invention.
subassembly 120 ‘for reciprocal sliding movement therein.
I claim:
Adjacent the outer portion of cyilndrical cavity 190‘ are a
1. An electrical switch comprising a casing including
pair of spaced projecting abutments 192 and 194 which
?rst and second casing members, one of said casing mem
are adapted to engage the underside of the main body por
bers including stationary contact means therein; movable
tion 132 of bridging element .130 to support the latter in
contact means engageable with said stationary contact
the contacts-open position, as best seen in FIG. 9. Cover
means; a bridging contact plunger type subassembly com
member 24 ‘further includes a pair of spaced deep recesses
prising a magnetic armature; shank means integral with
said armature; a bridging element supporting said mov
or pockets 196 and 198 ‘for the purpose of receiving debris
and matter such as contact splatter or casing material 55 able contact means ‘and slidably mounted on said shank
means; said shank means including a shoulder portion
which is broken down during arcing or other debris which
and spring means interposed between said shoulder por
might form ‘a low-resistance current path. Casing mem
tion ‘and said bridging element; one of said casing mem
ber 22 is further provided with a plurality of projecting
bers providing a hollow cavity in which said bridging
ribs ‘200 having recessed portions therebet-ween which are
adapted to collect debris and other matter such as that 60 contact plunger subassembly is disposed and guided for
reciprocating movement axially thereof; an energizing coil
mentioned above. Projecting ribs 20 are thus effective
disposed exteriorly of said casing member-s for said arma
for are shadow to prevent the undesirable formation of
ture, a non-magnetic weight member disposed in a portion
a low-resistance current path which might be formed by
of said hollow cavity adjacent said armature, said non
such debris. Cylindrical cavity 112 is: likewise provid
ed with a plurality of axially extending circumferentially 65 magnetic weight member having a cross-sectional con
?guration corresponding to that of said portion of said
spaced rib projections 202. Rib‘ projections 20x2, in addi
hollow cavity, said weight member being movable with
tion to advantageously obviating the formation of a low
said armature in each of two ‘opposite directions within
resistance current path, also provides line contact for
said portion of said hollow cavity and also being movable
engagement with slug 162 and armature 122 thereby min
imizing surface-to-surface contact. Projections 202 thus 70 relative to said arrnlature; the end of said hollow cavity
closest said nonmagnetic weight member providing a
prevent or at least minimize binding or resistance to slid~
stop to limit movement of said weight member relative
able reciprocating movement of the armature 122 and slug
to said armature.
162 within the cavity, which could be caused by debris
2. An‘ electrical switch comprising a casing including
in the cavity.
The electrical switch 20‘ thus far described advanta 75 ?rst and second casing members, one of said casing mem
3,099,725
8
bers including stationary contact means therein; movable
contact means engageable with said stationary contact
means; a bridging contact plunger type subassembly com
prising a magnetic ‘armature; shank means interconnected
with said armature for movement therewith; a bridging
element supporting said movable contact means and slid
ably mounted on said shank means; said shank means
including a shoulder portion; spring means interposed
between said shoulder portion and said bridging ele
ment; one of said casing members providing a hollow 10
portion in which said bridging contact plunger subassem
bly is disposed and guided for reciprocating movement
axially thereof; an energizing coil disposed exteriorly of
movable relative to said armature after said armature
and weight member have moved together a predetermined
amount in said second direction; said switch including
stop means for limiting movement of said weight member
relative to said armature.
9. The subassembly as set forth in claim 8 and wherein
said bridging element comprises a central body portion
and a pair of spaced contact-carrying arms; each of said
arms being located adjacent a respective end of said
central portion and said contact arms lying in a plane
offset ‘from said central portion; and ?exible means in
tegral with and interconnecting said central portion and
each of said contact arms.
10. In combination; a casing member; said casing
said casing members for said armature; and non-mag
netic means disposed in said hollow portion adjacent said 15 member being provided with a pair of spaced open-ended
guideway apertures; a pair of terminals each received in
armature, said non-magnetic means being movable with
and also relative to said armature means and said switch
a respective one of said apertures; each of said terminals
providing an aperture adjacent one free end thereof; each
of said terminals further including an electrical contact
3. The switch as set ‘forth in claim 2 and wherein‘ said 20 adjacent said aperture-s; a bridging contact plunger type
subassembly comprising a two-part plunger; one of said
spring means is disposed about said shank means and
parts comprising a magnetic armature; and the other of
comprises a variable rate spring.
said parts comprising a non-magnetic weight member
4. The switch as set forth in claim 3 and wherein said
bridging element comprises a main body section which
supported by said magnetic armature; shank means in
is slidably disposed about said shank means and includes 25 tegral with said ‘armature; a bridging element supporting
including stop means for limiting movement of said non—
magnetic means relative to said armature.
.a pair of spaced contact arms each disposed in‘ a plane
movable contact means for engagement respectively with
oilset from- the plane of said main body.
each of said ?rst-named contacts; said bridging element
being slidably mounted on said shank means; said shank
5. The switch as set forth in claim 4 and wherein said
means including a shoulder portion adjacent one free end
arms are offset from said main body portion in a direc
30 thereof; and spring means interposed between said shoul
tion toward said stationary contacts.
der portion and said bridging element, urging the latter
6. The switch as set forth in claim 2 and wherein said
hollow portion is provided with longitudinally extending,
substantially parallel spaced rib‘ portions.
tor movement in a contacts-closing direction; said casing
providing ‘an elongated cavity in which said two-part
plunger is disposed for reciprocating movement axially
pair of spaced stationary contacts disposed therein; said 35 thereof; an energizing coil disposed exteriorly of said
7. An electrical switch comprising a housing having a
housing further including a cylindrical hollow portion
casing for said armature; said non-magnetic member be
for reception of a cylindrical magnetic ‘armature of a
ing movable with ‘and also relative to said armature on
actuation thereof by said energizing coil; a cover mem
bridging contact plunger type subassembly; said mag
netic armature of said bridging contact plunger type sub
assembly including a shank portion of lesser diameter
interconnected with said armature; said shank portion
being provided adjacent the ‘free end thereof with shoul
der means; an electrically conductive bridging element
ber for said casing; said cover member including a pair
of projections, each of which are received within a re
spective one of said apertures in said terminals to align
and maintain said terminals in ?xed assembled relation.
11. The electrical switch as set forth in claim 10 and
wherein said cavity and said two-part plunger are cylin
carrying a pair of spaced electrical contacts for engage
ment with said stationary contacts; said bridging element 45 drical in shape, and said cavity includes a plurality of
being slidably supported on said shank portion; spring
means intermediate and engaging said bridging element
and said shoulder portion on‘ said shank means; said
spring means comprising a variable rate type spring; a
non-magnetic weight member formed separately from and
supported on said magnetic armature in said cylindrical
hollow portion ‘for reciprocal sliding movement therein;
said non-magnetic weight member being movable with
longitudinally extending and substantially parallel, spaced
ribbed portions.
12. An electrical switch comprising a housing having
a pair of spaced stationary contacts disposed therein;
said housing further including a cylindrical hollow por
tion for reception of a cylindrical magnetic armature of
a bridging contact plunger type subassembly; said mag
netic armature of said bridging contact plunger type sub
assembly including a shank portion of lesser diameter
and relative to said armature, the end of said hollow por
tion closest to said non-magnetic weight member pro 55 integral with said armature; said shank portion being
provided adjacent the free end thereof with shoulder
viding a stop to limit movement of said weight member
means; an electrically conductive bridging element carry
relative to said armature.
ing a pair of spaced electrical contacts for engagement
8. In an electrical switch, a bridging contact plunger
type subassembly comprising a two-part plunger; at least
with said stationary contacts; said bridging element being
one of said parts comprising a magnetic armature; stem 60 slidably supported on said shank portion; spring means
intermediate and engaging said bridging element and said
means interconnected with said armature and including a
shoulder portion on said shank means; a non-magnetic
spring retaining portion adjacent its free end thereof; a
weight member supported by said armature in said cylin
bridging element slidably mounted on said stem means
drical hollow portion for reciprocal sliding movement
intermediate said free end and said magnetic armature;
said bridging element supporting a pair of spaced elec 65 therein; said non-magnetic member being positioned for
continuous movement with said armature in said hollow
trical contacts; spring means intermediate said bridging
element and said spring retaining portion urging said
bridging element for engagement with said magnetic
portion when said armature moves in a first direction, said
non-magnetic member also being positioned for move
ment with and relative to said armature in said hollow
armature; said other part of said plunger assembly com
prising a non-magnetic weight member formed separately 70 portion when said armature moves in a direction op
posite to said ?rst direction.
from and supported by said armature for unrestricted
movement therewith as a unit in a ?rst direction; said
weight member also being positioned for movement with
said magnetic armature in a second direction opposite to
13. iIn an electrical switch, a bridging contact plunger
type subassembly comprising a two-part plunger; at least
one of said parts comprising a magnetic armature; stem
said ?rst direction; said weight member further being 75 means interconnected with said armature; a bridging ele
3,099,725
10
ment mounted on said stem means; said bridging element
supporting a pair of spaced electrical contacts; said other
part of said plunger assembly comprising a non-magnetic
Weight member formed separately from and supported
means for limiting movement of said non-magnetic
Weight member relative to said armature.
17. An electrical switch comprising a housing having
a pair of spaced stationary electrical contacts mounted
therein, said switch further including an elongated mag
by said armature for unrestricted movement therewith as
netic armature and means for guiding said armature
a unit in a ?rst direction; said weight member also being
for reciprocal movement in said housing; a bridging
positioned for movement with said magnetic armature
member comprising a central body portion and a pair of
in a second direction opposite to said ?rst direction; said
spaced contact-carrying arms; each of said arms being
weight member further being movable relative to said
armature after said armature ‘and weight member have 10 located adjacent a respective end of said central body
portion and lying in a plane offset from the plane of said
moved together a predetermined amount in said second
central body portion; ?exible means integral with and in
direction; and said switch including stop means for limit
terconnecting said central body portion and each of said
ing movement of said weight member relative to said
contact~carrying arms; each of said contact-carrying arms
armature.
14. An electrical switch comprising a housing having 15 mounting a respective one of a pair of movable con
tacts positioned for engagement with said stationary
a pair of spaced stationary electrical contacts disposed
contacts; said magnetic armature being interconnected
therein; said housing further including a cylindrical hol
low portion for reception of a cylindrical magnetic anna
with said central body portion of said bridging member
for movement of the latter and the movable contacts car
ture of a bridging contact plunger-type subassembly;
said magnetic armature of said bridging contact plunger 20 ried thereby in a direction to cause closing of said sta
tionary and movable contacts whereby upon closing of
type subassembly including a shank portion of lesser di
ameter interconnected with said armature; an electrically
said contacts, said offset contact arms are ?exible rela
tive to said central portion to effect a contact wiping ac
conductive bridging member carrying a pair of spaced
tion; a non-magnetic weight member formed separately
electrical contacts positioned for engagement with said
stationary contacts; said bridging member being car 25 from and supported on said magnetic armature for move
ment therewith, said non-magnetic weight member also
ried by said shank portion; a non-magnetic weight mem
ber formed separately from and supported on said mag
being movable relative to said armature, said switch fur
ther including electromagnetic means for causing move
netic armature in said cylindrical hollow portion for recip
ment of said magnetic armature, and said switch includ
rocal sliding movement therein, said non-magnetic weight
member being movable with and relative to said arma 30 ing stop means for limiting movement of said non-mag
netic ‘weight member relative to said armature.
ture, the end of said hollow portion closest to said non
18. ‘An electrical switch comprising a casing includ
magnetic weight member providing a stop to limit move
ment of said weight member relative to said armature.
ing ?rst and second casing members, one of said cas
15. An electrical switch comprising a casing including
?rst and second casing members, one of said casing mem
bers including stationary contact means therein; movable
contact means engageable with said stationary contact
means; a bridging contact plunger-type subassembly com
prising a magnetic armature; shank means interconnected
with said ‘armature; a bridging element supporting said 40
ing members including stationary contact means there
in; movable contact means engageable With said station
ary contact means; a bridging contact plunger-type sub
assembly comprising a magnetic armature; shank means
interconnected with said armature; a bridging element
supporting said movable contact means and mounted on
said shank means; one of said casing members providing
movable contact means and slidably mounted on said
a hollow cavity in which said bridging contact plunger
shank means; one of said casing members providing
a hollow cavity in which said bridging contact plunger
subassembly is disposed and guided for reciprocating
movement axially thereof; said switch including an ener
gizing coil for said armature; a non-magnetic weight
movement axially thereof; an energizing coil disposed 45 member disposed in a portion of said hollow cavity ad
jacent said armature, said weight member being formed
exteriorly of said hollow cavity for said armature; a
non-magnetic weight member disposed in a portion of
separately from and supported on said armature for
movement therewith within said portion of said hollow
said hollow cavity adjacent said armature, said weight
subassembly is disposed and guided for reciprocating
member being formed separately from and supported
cavity, said weight member also being positioned for
on said armature for movement therewith within said
movement relative to said armature within said portion
of said cavity, and the end of said cavity closest to said
weight member providing a stop to limit movement of
said weight member relative to said armature.
portion of said hollow cavity, said weight member also
being positioned for movement relative to said arma
ture within said portion of said cavity, said weight mem
ber having a cross-sectional con?guration which is com
plementary in shape to the crossesectional con?guration
of said portion of said cavity, the end of said cavity closest
to said weight member providing a stop to limit move
ment of said weight member relative to said armature.
‘16. An electrical switch comprising a housing having
stationary electrical contact means disposed therein; said
switch further including an elongated magnetic arma
ture; said switch including means for guiding said mag
netic armature for reciprocal movement in said housing;
said magnetic armature being interconnected with mov
able contact means for movement of the latter into and 65
out of engagement with said stationary contact means;
a non-magnetic weight member formed separately from
and supported on said magnetic armature for movement
therewith, said non-magnetic weight member also being
movable relative to said armature, said switch further 70
including electromagnetic means for causing movement
of said magnetic armature, and said switch including stop
References Cited in the ?le of this patent
UNITED STATES PATENTS
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