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Патент USA US2113495

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April 5, 1938.
T. G. RICHMOND
2,i 13,495
THERMOSTATIC SWITCH
Filed June 5o, '193e
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INVENÍIÚR.'
Patented Apr. 5, 1938
2,113,495
`'UNITED STATES PATENT OFFICE
y
2,113,495
THERMOSTATIC SWITCH
Thomas Guthrig Richmond, Glasgow, Scotland
Application June 30, 1936, Serial No. 88,208
In Great Britain March 12, 1936
‘ 13 claims. (C1. 2045137)
This invention relates to snap action mecha
In carrying the invention into effect according
nism for operating electric switches, valves and to the form illustrated in the figures of the ac
other devices and comprises an improvement in companying drawing and as applied by way of ,
or modification of the invention described and example to the thermostat having a short-gap
5 claimed in my co-pending application, filed 22nd large contact switch, as set forth inthe speciñ 5
cation of my co-pending application filed 22nd
October, 1935, No. 46,200.
The snap action mechanism set- forth in the October, 1935, No. 46,200, a body I is mounted on
said co-pending patent application comprises a the casing 2, but insulated therefrom by ma
non-resilient operating member pivoted at one terial I3, and is provided with an upstanding sup
i0 end, a member acting resiliently on said oper
port 3 on one face of which a horizontal V groove
ating member in such manner as to urge it to
wards but slightly offset from its pivot so as to
exert a turning moment in one direction, and
means for applying a resilient force at right
angles to said operating member against the ac
tion of said member acting resiliently to exert a
turning moment in the opposite direction, the
arrangement being such that as the moment due
to the resilient force increases it overbalances the
20 opposing moment and causes movement of the
said operating member to take place, the oppos
ing moment decreasing much more rapidly than
the applied moment whereby the snap action
takes place before the operating member passes
25 through dead centre or neutral position, such
movement of the said operating member taking
place at the end remote from its pivot point to
operate an electric switch, valve or the like.
Further, in the constructions described in the
4 is provided, and in this V groove is located an
operating member 5 which lies substantially par
allel to said body,r the operating member having
a knife edge 6 atìone end parallel to said body
about which it pivots in the V groove 4. -'I'he
length of the groove is approximately equal to the
width of the operating member 5 so as toy prevent
it from moving sideways.
.
`*
The other end of the operating member is pro
vided with a contact 'l which engages with a
fixed contact 8 mounted upon a suitable member
9 secured to the body I by means of pillars I0,
but insulated therefrom by suitable insulating
means.- This limits the movement in one direc
tion. The contact 8 is preferably made adjust
able in the member 9 and when set in the correct
position is locked therein by the lock nut II. An
adjustable stop I2, or the like, is provided upon
member is pressed against the pivot point on the
body of the device in which it is incorporated by
the body I so as to limit the movement in the
other direction and thus control the opening or
gap between the contacts to any suitable amount.
If desired, the stop I2 may be mounted upon the
a resilient force which is described as being sup
operating member.
plied either by the resiliency of the strut member
35 itself or by the resiliency of one or both of the
Provided upon the said body on the opposite
end to the support 3 is another support I4 in
supports or brackets on the body to which the
strut member and the operating member are piv
which is situated a suitable screw or the like I5
having a cup or conical bearing I6 which may be
30
above mentioned speciilcation, the operating
oted respectively.
’
According to the present invention, in snap ac
40 tion mechanism, as set forth in my said prior
patent application, the resilient force is supplied
by the operating member itself by making said
member resilient betweenits two pivotal points.
The invention will now be described by way of
45
example with reference to the accompanying
drawing, in which:
Figures 1 and 2 are sectional elevations of one
form of the invention.
Figure 3 is a sectional elevation of a modifica-v
tion oi.' Figure 1.
Figures 4, 5 and 6 show an alternative form of
making the operating member resilient.
Figure 7 shows a thermostatic switch in sec»
tion, and
Figure 8 is a side view of Figure 7.
En u
< jewelled if desired, or made of hardened steel or
other suitable material. The operating member
5 is drilled longitudinally slightly offset of said
knife edge 6 and the bottom of the hole is pro
vided with a similar cup or conical bearing I1
which may be hardened steel or other material
and pressed into position. A rigid strut member
I8 is provided with conical pivot points, and this
is iitted so that one end rests in the bearing Il
within the pivoted member and the other end in
the bearing I6 in the support. The screw I5 is
then tightened up so that the strut member I8
keeps the operating member 5 in the V groove,
and due to its pressure being oifset tends to turn
the operating member about its knife edge and
press the two contacts together. Also supported
upon- the pillars I0 or the like is a spring member
20 having a depending tongue 2| or the like, 55
2
2,113,495
which is arranged so that it will make contact
with the operating member 5.
The thermally sensitive member comprises a
the operating member itself will, in this case, sup
brass tube 25 securely fixed at one end to the
casing 2 and at the other end to a rod 26 which
is a sliding iit in said easing. The rod 26 is con
nected rigidly to a stirrup member 21 which is
provided with an adjusting screw 28 having a
pointed end or tip 29 made of insulating material
such, for example, as glass or porcelain. This tip
ods of making the operating member resilient just
between its pivotal points can be devised, but the
29 is arranged to press against the spring member
20 so that its depending tongue 2l will press
against the operating member 5 and thus apply
portion-of the operating member on which the
contact, valve or the like is mounted, must be
kept rigid so as to prevent any loss to, or unneces
sary motion of the operating member to take
place before the contacts move away from one
another with the snap action.
I claim:
1. A snap action make and break mechanism
a lateral force thereto. which will overbalance
comprising in combination a body. an operating
15 the longitudinal pressure and flick over the oper
ating member 5 so that the contacts ily apart.
The spring member is arranged to magnify the
movement of the means which applies the lateral
force to the strut member. A knurled head 3i,
20 having a pointer thereon, is provided upon the
adjusting screw 28 so as tol adjust the tempera
ture at which the contacts open. A suitable scale
-or the like 32 is provided upon the top of the
cover 33 which fits on to the casing 2 and encloses
the instrument.
'
‘
According to the present invention the neces
sary energy to carry over the contact 'l with a
snap action is stored in the operatingl member 5
by providing it with a transverse slit or saw cut
30 A between the pivotal points 6 and i1 such that
the section of the operating member is so re
duced by said slit or saw 4cut that the necessary
35
spring or resiliency is given thereto. It is found
in practice, that a small amount of resiliency is
all that is required to cause the snap action to
take place and therefore the depth of the slit or
saw cut A into the section of the metal of which
the operating member is made will depend upon
the resiliency of the metal itself to give the re
40 quired spring. The bottom extremity of the slit
or saw cut may be terminated by a small circular
hole B which may be drilled first in the operating
member and then the slit or saw cut made so
that it enters the circular hole.
45
According to a modification illustrated in Fig
ure 3, the section of the operating member may
be reduced to give the necessary resilience or
spring by cutting out a portion O of the member
such that a thin or narrow strip is left on each
50 side connecting the two portions of the member
together and this will result in the necessary
spring being provided. This may be done by
drilling a hole transversely through the member.
The cut out portion O may be any other shape
55
ply the necessary resiliency.
It is to be understood that various other meth
than circular.
Further, instead of making the actual spring
by means of the resiliency of the material itself,
the operating member between the two pivotal
points may be made telescopic, as shown in Fig
60 ures 4 and 5, and the two portions 5 and 51
pressed away from oneanother by a compression
spring S. In this manner', when the member is
pressed by the strut member up against the piv
otal point of the bracket, the spring will give the
65 necessary resilience to the force.
If desired, instead of making‘the whole of the
operating member between the two pivotal points
as two separate pieces 5 and 51 which telescope
one within the other, the actual cup bearing I1
70 may be made separate and a slidable fit into the
- operating member 5 and at the- back of this a
compression spring S may be fitted. In this man
ner, the necessary resilience, when the strut
member I8 supplies a force to the cup bearing, is
75 obtained through the compression spring, and
member pivoted at one end to said body. means
to make the said operating member resilient at
a point between its two extremities, a member at
the other end of said body, with which the other
end of said operating member makes contact, a
member pivotally supported at one end on said 20
body and at the other end on said operating
member applying a resilient turning moment to
said operating member in one direction, and a
resilient member mounted upon said body adapt
ed to apply a force which creates a turning mo
25
ment which is applied in the opposite direction
to said operating member, movement of said
operating member taking place when one turning
moment overbalances the other turning moment,
and the snap action being due to the overbalanced 30
turning moment decreasing more rapidly than
the other turning moment and taking place be
fore the said operating member reaches the dead
centre or neutral position.
'
2. A snap action make and break short gap 35
mechanism, comprising in combination a body.
two upstanding supports on said body, an oper
ating member pivotally supported at one end on
one of said supports, means to make the said op
erating member resilient at a point between its
two extremities, a floating member pivotally sup
ported upon said operating member and said oth
er support applying a resilient turning moment in
one direction, a member on said body, a. member
on said operating member contacting with said
body member, a resilient member mounted upon
said body adapted to apply a force which creates
a turning moment which is applied in the oppo
site direction to said operating member, and
means coacting with said resilient member to 50
apply pressure thereto, said snap action taking
place before the said operating member reaches
the dead centre or neutral position.
3. A snap action make and break mechanism
comprising in combination a body, a resilient
operating member pivoted at one end to said
body, a reduction of sectional area at a point on
said' operating member, a member at the other
end of said body, with which the other end of
said operating member makes contact, a member 60
pivotally supported at one end on said body and
at the other end on said operating member ap
plying a resilient turning moment to said oper
ating member in one direction, and a resilient
member mounted upon said body adapted to ap
ply a force which creates a turning moment which
is applied in the opposite direction to said oper
ating member, movement of said operating mem
ber taking place when one turning moment over
balances the other turning moment, and the snap
action being due to the overbalanced turning
moment decreasing more rapidly than the other
turning moment and taking place before the said
operating member reaches the dead centre or
neutral position.
75
3
2,113,495
4. A snap action make and break short gap
mechanism, comprising in combination, a body,
two upstandlng supports on said body, a resilient
operating member pivotally supported at one
end on one of said supports, a reduction of sec
tional area at a point on said operating member,
a floating member pivotally supported upon said
operating member and said other support apply
ing a resilient turning moment in one direction,
a member on said body, a member on said oper
ating member contacting with said body mem
ber, a resilient member mounted upon said body
adapted to apply a force which creates a turning
moment which is applied in the opposite direc
tion to said operating member, and means co
acting with said resilient member to apply pres
sure thereto, said snap action taking place be
fore the said operating member reaches the dead
centre or neutral position.
5. A snap action make and break mechanism
comprising in combination a body, a resilient
operating member pivoted at one end to said
body, and formed of two portions telescoping to
gether, spring means pressing said two portions
~away `from one another, a member at the other
end of said body, with which the other end of
said operating member makes contact, a member
pivotally supported at one end on said body and
at the other end on said operating member apply
ing a resilient turning moment to said operating
member in one direction and a resilient member
mounted upon said body adapted to apply a force
which creates a turning moment which is applied
in the opposite direction to said operating mem
ber, movement of said operating member taking
place when one turning moment overbalances
the other turning moment and the snap action
being due to the overbalanced turning moment
decreasing more rapidly than the other turning
moment and taking place before the said oper
ating member reaches the dead centre or neutral
position.
'6. A snap action make and break short gap
mechanism, comprising in combination, a body,
two upstandlng supports on said body, a resilient
operating member pivotally supported at one end
on one of said supports, and formed of two por
tions telescoping together, spring means pressing
said two portions away from one another, a ñoat
ing member pivotally supported upon said oper
ating member and said other support applying
a resilient turning moment in one direction, a
member on said body, a member on said operat
(3()
ates a turning moment which is applied in the
opposite direction to said operating member,
movement of said operating member taking place
when one turning moment overbalances the other
turning moment, and the snap action being due
to the overbalanced turning moment decreasing
more rapidly than the other >turning moment
and taking place before the said operating mem
ber reaches the dead centre or neutral position.
8. A snap action make and break short gap
thermostatic switch comprising in combination
a body, two upstanding supports on said body,
an operating member pivotally supported at one '
end on one of said supports, means to make the
said operating member resilient at a point be 15
tween its two extremities, a floating member piv
otally supported upon said operating member and
said other support applying a resilient turning
moment in one direction, a member o'n said body,
a member on said operating member contacting 20
with said- body member, a resilient member
mounted upon said body adapted to apply a forcel
which creates a turning moment which is applied
in the opposite direction to said operating mem
ber, and means coacting with said resilient mem
ber to apply pressure thereto, said snap action
taking place before the said operating member
reaches the dead centre or neutral position.
9. A snap action make and break short gap
thermostatic switch comprising in combination 30
a body, a resilient operating member pivoted at
one end to said body, a reduction of sectional
area at a point on said operating member, a
member at the other end of said body, with which
the other end of said operating member makes
contact, a member pivotally supported at one end
on said body and at the other end on said oper
ating memberapplylng a resilient turning mo
ment to said operating member in one direction,
and a resilient member mounted upon said body 40
adapted to apply a force which creates a turning’
moment which is applied in the opposite direction
to said operating member, movement of said
operating member taking place when one turn
ing moment overbalances the other turning mo
ment, and the snap action being due to the over
balanced turning moment decreasing more rapid
ly than the other turning moment and taking
place before the said operating member reaches
the dead centre or neutral position.
50
l0. A snap action make and break short gap
thermostatic switch comprising in combination,
ing member contacting with said body member,
a body, two upstanding supports on said body,~
a resilient operating member pivotally supported
a resilient member mounted upon said body
adapted to apply a force which creates a turning
at one end on one of said supports, a reduction 55
of sectional area at a point on said operating
moment which is applied in the opposite direc
tion to said operating member, and means coact
ing with said resilient member to apply pressure
upon said operating member and said other sup
port applying a resilient turning moment in one
thereto, said snap action taking place before the
said operating member reaches the dead centre
or neutral position.
said operating member contacting with said body
7. A snap action make and break short gap
thermostatic switch comprising in combination
- a body, an operating member pivoted at one end
to said body, means to make the said operating
member resilient at a point between its two ex
tremities,- a member at the other end of said body,
with which the other end of said operating mem
ber makes contact, a member pivotally supported
at one end on said body and at the other end on
said operating member applying a resilient turn
ing moment to said operating member in one di
rection, and a resilient member mounted upon
said body adapted to apply a force which cre
memberpa floating member pivotally supported
direction, a member on said body, a member on 60
member, a resilient member mounted upon said
body adapted to apply a force which creates a
turning moment which is applied in the opposite
direction to said operating member, and means 65
coacting with said resilient member' to apply
pressure thereto, said snap action taking place
before the said operating member reaches the
dead centre or neutral position. ’
»
11. A snap action make and break short gap 70
thermostatic switch comprising in combination,
a body, two upstandlng supports on said body,
a resilient operating member pivotally supported
at one end on one of said supports, a ñoating
member pivotally supported upon said operating « `
2,113,495
member and said other support applying a re
silient turning moment in one direction, a con»
tact on said body, a contact on said operating
member engaging with said body contact, means
for preventing, said operating member passing
through dead centre or neutral position when the
contacts are opened, a resilient member mounted
means coacting with said resilient member to
apply pressure thereto.
13. A snap action make and break short gap
switch comprising in combination, a body, two
upstanding supports on said body, a V groove in
one support, a cup shaped bearing in the other
said support, a resilient operating member, a
knife edge on said operating member engaging
upon said body and pressing upon said operating
member applying a turning moment in the oppo - said V groove on said support, a cup shaped bear~
site direction, and a thermally sensitive member ing on said operating member, a floating mem
ooacting vwith. said resilient member to apply ber supported in said cup bearings on the sup
port and operating member respectively, said
pressure thereto.
l2. A snap action make and break short gap floating member applying a resilient turning mo
switch comprising in combination a body, two ment in one direction to said operatng member,
upstanding supports on said body, a resilient means for adjusting the force exerted by said
operating member pivotally supported at one end floating member upon said operating member, a
on one of said supports, a floating member piv
otally supported upon said operating member and
said other support applying a resilient turning
moment in one direction to said operating mem
ber, means for adjusting the end pressure fon said
floating member, a contact on said body, a conm
tact on said operating member engaging with said
body contact, means for preventing said operat
ing member passing through dead centre or neu~
tral position when the contacts are opened, a
resilient member mounted upon said body and
pressing upon said operating member applying a
turning moment in the opposite direction, and ’
10
contact on a portion o! said operating member
remote from the two bearings, a contact on said
body adapted to be engaged by- said contact on
said operating member, a stop to limit the gap i
between the contacts and to prevent the operat
ing member from passing through dead centre or
neutral position, a resilient member mounted
upon said body to press upon said operating mem
ber for applying a turning moment in the opposite
direction, and means coacting with said resilient
member to apply pressure thereto.
THOMAS GUTHRIG RICHMOND.
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