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Патент USA US2116605

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May 10, 1938.
- H. KELLY
2,1 16,605
SNAP ACTION MECHANISM
Filed Sept. 18,‘ 1955
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Patented May 10, 1938
2,116,605
_ UNITED STATES
PATENT OFFICE -
2,116,605
SNAP ACTION MECHANISM
‘
Hugh Kelly, Minneapolis, Minn, assignor to
Minneapolis-Honeywell Regulator Company,
Minneapolis, Minn., a corporation of Delaware
'
'
Application September 18, 1935, Serial No. 41,097
15 Claims.
(Cl. 137-439)
This invention relates to snap action mecha
nisms and more particularly to that type of mech
port I5. The valve H is secured in any‘ suitable
tions wherein gradual movement of the element
The casing 23 and the support 2| are provided 10
with openings to accommodate the valve stem l8.
Located within the casing 23 and secured to the
manner to a valve stem l8 extending upwardly out
anism wherein the element to be moved is moved of the casing H. A diaphragm sealing means I9
through a portion of its movement by a modulat
is secured to the valve stem I8 by means of nuts
5 ing action and through the remainder of its ‘ 20 and the diaphragm l9 and a support 2i are
movement by a snap action.
secured to the valve casing II by means of a
It is an object of this invention to provide a nut 22.
snap action mechanism for an element- which is
Secured to the support 2| is a casing or housing
adapted to be moved between two extreme posi > 23 enclosing the snap action of my invention.
from one extreme position to some intermediate
position is obtained and wherein the element is
snapped from this intermediate position to the
other extreme position.
15
Another object of this invention is to apply this
snap action mechanism to a valve means where
by the valve means may be modulated from a full
open position to a partially open position and
snapped from the partially open position to a
valve stem l8 in any suitable manner is an abut
ment member 25. A spring 26 is located between
the abutment member 25 and a spring retaining
cup 2‘! located on the casing 23, the arrangement
beingsuch that the spring 26 biases the valve ll
towards an open position.
_
One end of a shaft or pin 28 is journalled in
go closed position, and wherein the valve means may M the housing 23 at 29 and the other end of the
be snapped from a closed position to a partially shaft 28 is carried by a journal or bearing 39
open position and modulated between this par-v screw—threaded into the housing 23 as at 3|. A
tially open position and the full open position.
lever 33 having down-turned ears 34 is- mounted
Another object of this invention is the pro
on the shaft 28. The lever 33 is provided with
an opening centrally thereof to accommodate the 25
25 vision of latch means in the snap action mecha
nism, the latch means being adjustable whereby
the intermediate position from which the element
is snapped may be adjusted.
The speci?c details of construction disclosed
3o hereinafter also form objects of this invention.
For a complete understanding of this invention
reference is made to the accompanying descrip
tion and drawing, in which drawing:
Figure 1 is a plan view of my snap action mech
35 anism with a portion thereof shown in section;
valve stem I8 and adjacent this opening the
lever 33 is provided with detents 36 adapted to
engage the abutment member 25 mounted on the
valve stem l8. Adjacent the end of the lever
33 opposite the shaft 28 is an opening 81.
30
p Also mounted on the shaft 28 is a second lever
39 having a horizontally extending portion 49. A
pin 4| is secured to the horizontally extending
portion 48 and extends downwardly through the
opening 31 in the lever 33 and this pin 4| is pro— 35
Figure 2 is a vertical sectional view of the mech- . vided at its' lower extremity with a shoulder 42.
Located between the horizontally extending por- ‘
anism shown in Figure 1;
~
Figure 3 is a view similar to Figure 2 but show
tion 40 of the lever 39 and the lever 33 is a spring
43, the spring 43 being stronger than the spring
26. The spring 43 is adapted to maintain‘the 40
‘levers 39 and 33 separated to the extent allowed
ing the parts in still another position;
Figure 5 is a sectional view of an adjustable _ by the pin 4| and the shoulder 42 thereof. By
ing the parts in another position;
40
Figure 4 is a view similar to Figure 2 but show
latch used in my invention; and
Figure 6 is an elevational view of the latch
45 shown in Figure 5.
'
.
Although the snap action mechanism of my
invention is of general utility it is shown as op
erating a valve generally designated at Ill. The
valve in may comprise a casing I I having a trans
50 verse partition l2 dividing the casing into an inlet
chamber l3 and an outlet chamber l4. The
transverse partition I2 is provided with an open
ing or port l5 and an annular seat l6 around the
opening. A valve I1 is adapted to move toward
55 and away from the seat IE to open or close the
reason of this construction a spring pressed lost
motion connection is provided between these two
levers. The lever 39 is also provided with abut 45
ments 44 which are adapted to engage a lever 45,
the lever 45 also being pivoted on the shaft 28.
The lever 45 is provided with a longitudinally ex
tending arm 45 which carries a pin 41.
The lever 45 as shown in Figure 1 is provided 50
with a member 48 which is adapted to receive a
conical abutment member 48 mounted on a spring
retaining member 50. One end of a compression
spring 5| engages the spring retaining member
68 and the other end of the spring 5| engages a 55
2
2,116,605
second spring retaining member 52. The spring
retaining member 52 is in abutting relation with a
1 reciprocable member 53 which is adapted to be
reciprocated upon rotation of a handle 54 in a
manner known in the art.‘ By reason of this
structure the spring 5| is made adjustable and
the amount 01' adjustment thereof is indicated by
>means 01' the indications cooperating with the
rotatable handle 54.
The member 48 is also adapted to be engaged
10
by a conical abutment member 55 carried by a
plunger 56. The plunger 56 is operated by a bel
51 the lever 45 is moved in a clockwise direction
and, by reason of the abutting relation between
the levers 39 and 45 and the spring pressed lost
motion connection between the levers 39 and 33
the valve 11 is moved towards a closed position
against the action of the valve opening spring 26.
In this way the valve I1 is modulated between a
full open position and a partially open position
in accordance with changes in pressure aii'ecting
the bellows within the casing 51.
.
10
Upon a further increase in pressure affecting
the bellows within the casing 51 the lever 33 is
moved into engagement with the adjustable latch
lows contained in a casing 51 in a manner well
' known in the art. The casing 51 is secured to 63, whereby furtherclosing movement of the
15 the housing 23 by means of screws 56. The bel- . valve I1 is prevented, as shown in Figure 2.
lows contained within .the casing 51 may be oper
ated by changes in pressure transmitted to the
casing 51 or the casing 51 may contain a vola
tile ?uid or be connected to a ‘source of volatile
20 ?uid which expands and contracts to move the
bellows therein in accordance with temperature
changes. The bellows within the casing 51 is
adapted to rotate the lever 45 in a clockwise
direction about its pivot 28 and the spring 5| is
25 adapted to rotate the lever 45in a counter-clock
wise direction.’ Therefore, by adjusting the ten
sion of the spring 5| the amount of pressure or
temperature required to move the lever 45 may
30
be accurately determined.
vMounted on the bottom wall of the casing 23
is a support69 which carries a pivot pin 6|.
Mounted on the pivot pin 6| is a latch lever 62
having secured thereto an adjustable latch mem
ber 63. The latch member 62 is biased in a
35 counter-clockwise direction by means 01' a spring
64 and the amount of clockwise movement there
of is limited by means of a stop 65 secured to the
support 60.
I
-
Referring now to Figures 5 and 6, the struc
'40 ture of the adjustable latch member is shown
in detail. The adjustable latch member 63 is
mounted on a pin -66 carried by the latch lever
62 and is frictionally held against rotation by
'causes compressing of the spring 43 and when
the spring 43 has been suf?ciently compressed
the latch arm 14 is moved in a clockwise direc-,
tion to overlay the horizontal portion 46 of the 20
lever 39 and the parts assume the position shown
in Figure 3. .
.Upon a further increase in pressure in the
casing 51 the lever 45 is moved further in a
clockwise direction and the pin 41 carried by the 25
lever 45 engages the latch arm 62 to pull the
adjustable'latching mechanism 63 from under
the lever 33. Since the spring 43 is stronger than
the spring 26 releasing of the lever 33 in this
manner causes closing movement of the valve l1 30
with a snap action.
'
>
Upon a decrease in pressure in casing 51, the
lever 45 is moved in a counter-clockwise direc
tion and since the spring 43 urges the lever 39
into engagement with the lever 45. the horizontal 35
portion 40 of the lever 39 engages the latch 14,
the valve 11 still being held closed by the action
of the spring 43 as shown in Figure 4.
Upon a further decrease in pressure within
the casing 51 the lever 45 is moved in a counter 40
clockwise direction and this counter-clockwise
movement causes pin 41 to engage the down
wardly extending lever 15 of the latch member
14 to move the latch member 14 out of engage
ment with the horizontal portion 40 of the lever 45
39. When the latch member 14 is so moved out
means of a friction spring 61 located between the
45 adjustable latch member 63 and the latch lever
62. The adjustable latch member may take the
' form of an eccentric. The pin 66 also carries a
- of engagement with the horizontal portion 40 of
pointer 68 adapted to co-act with indications on the lever 39 the spring 43 is expanded to take
the latch lever 62 and the adjustable latch mem
up the lost motion between the levers 39 and 33
50 ber 63 and the pointer 68 may be rotated with
and the spring 26 snaps the valve I1 to a partially
respect to the latch lever 62 by means of a screw open position, the amount of opening movement
head 69 integral with the pin 66, the amount being dependent upon the pressure within the
of adjustment being indicated by the pointer“ casing 51. Further decrease in pressure within
_with respect to the indications on the latch lever the casing 51 causes further gradual opening 01'
55 62. The lever 62 is provided with limiting lugs 10 the valve l1 and the valve I1 is allowed to modu
to limit the adjustment of the adjustable latch »
late between the full open position and the par
member 63 to substantially 180°. rotation.
tially open position in the manner pointed out
Mounted on the side wall of the casing 23 is
another support 12 carrying a pivot pin 13.
By reason of the snap action mechanism de
to Mounted on the pivot pin 13 is a second latch scribed
above, a means is provided for operating
member 14 having a downwardly extending arm
an element or a valve between extreme positions
15. The latch member 14 is biased in a clockwise wherein the element or valve may be modulated
direction by means of a spring 16, and the amount
one extreme position and an intermedi
of clockwise movement is limited by a lug 11 between
ate position and snapped between the intermedi
carried
by
the
latch
member
14
which
engages
65
ate position and the other extreme position.
the support 12..
Means are provided in the snap action mecha
With the parts in the position shown in Fig
above.
ure 2 the valve I1 is in a partially open position.
Upon a decrease in pressure a?ecting the bellows
70 within the casing 51 the spring 5| moves the
lever 45 in a counter-clockwise direction and the
spring 26 urges the levers 33 and 39 also in a
counter-clockwise direction and permits opening
movement of the- valve l1. Upon an increase in
75 pressure a?ecting the bellows within thecasing
15
Further clockwise movement of the lever 45
'
-
'
50
‘
55
'
60
65
nism whereby the intermediate position from
which the snap action takes place may be ad
justed, the means in this particular exempli?ca
tion of the invention being the eccentrically 70
mounted adjustable latch means‘63.
Although I_ have disclosed one form of my in
vention for purposes of illustration, various forms
thereof may become apparent to those skilled in . '
the art and, consequently, the invention is to be 75
3
2,116,605 '
limited only by the scope of the appended claims.
I claim as my invention:
1. In a device of the class described, an ele
said latch comprising a pivoted lever, an eccen
trically mounted abutment on said lever and
means for rotating said abutment whereby the
ment movable between two extreme positions,
amount of‘ snap action movement may be ad
spring means biasing said element in one direc
justed.
tion, a pivoted lever abutting said element, a
latch for said lever, a second pivoted lever, a
spring pressed lost motion connection between
said levers, a latch for said second lever, a third
10 pivoted lever for engaging said second lever and
carrying a pin for engaging said latches, means
for operating said third lever, the arrangement
being such that when said third lever is operated
in one direction, the element is moved from one
15 extreme position to an intermediate position, the
?rst lever engages the ?rst latch to stop further
movement ofthe element, the spring pressed lost
motion connection is compressed, the second le
ver engages the second latch, and the pin‘ carried
by the third lever engages the ?rst latch to re
‘
7. In a device of the class descried, an ele
ment movable between two extreme positions,
means biasing said element in one direction, a
pivoted lever abutting said element, a latch for
said lever, a second pivoted lover, a spring pressed 10
lost motion connection between said levers, a
latch for said second lever, a third pivoted lever
for engaging said second lever and carrying a pin
for engaging said latches, spring means for urg
ing'said third lever in one direction and pressure 16
operated means for moving said lever in the other
direction, the arrangement being such that when
said third lever is operated by said pressure op
erated means in one direction, the. element is
moved against the action of its biasing means 20
from one extreme position to an intermediate
lost motion connection snaps the element to the , position, the ?rst lever engages the first latch to
lease the ?rst lever whereby the spring pressed
other extreme position.
7
2. In a device of the class described, an element
stop further movement of the element, the spring
pressed lost motion connection is compressed, the
pivoted lever abutting said element, a latch for
said lever, a second pivoted lever, a spring pressed
lost motion connection between said levers, a latch
second lever engages the second latch, and the 25
pin carried by the third lever engages the ?rst
latch to release the ?rst lever whereby the spring
pressed lost motion connection snaps the element
to the other extreme position.
30 for said second lever, a third pivoted lever for
8. In a device of the class described, an element 30
movable between two extreme positions, spring
means biasing said element in one direction, a
engaging said second lever and carrying a pin ' movable between two extreme positions, spring
means biasing said element towards one extreme
for engaging said latches, and means for operat
position, a pivoted lever abutting said element, a
ing said third lever.
_
.
latch for said lever, a second pivoted lever, a
3. In a device of the‘class described, an ele
35 ment biased towards one position, a lever for
moving the element toward another position, a
latch to be engaged by said lever to prevent com
plete movement of the‘ element to the other posi
tion, a second lever having a spring connection
40 with the ?rst lever, a third lever engaging said
second lever for compressing the spring connec
tion and releasing said latch to move said ele
ment to the other position with a snap action. -
a. In a device of the class described, an element
biased towards one position, a lever for moving
the element toward another position, a latch to
spring ‘pressed lost motion connection between 35
said levers, a latch for said second lever, a third
pivoted lever for abutting said second lever and
having a pin ‘for engaging said latches, spring
means for urging said third lever in one direction
and pressure operated means for moving said 40
lever in the other direction.
9. In a device of the class described, an element
movable between two extreme positions and bi
ased towards one of said positions, a lever for
operating said element, a latch to be engaged 45
by said lever to prevent uninterruptedmovement
be engaged by said lever to prevent complete
of said ‘element toward the second of said ex— \
movement of the element to the other position, a
treme positions, a second lever having a spring
connection with the ?rst lever, a third lever en
gaging said second lever for compressing the 50
> second lever having a spring connection with the
50 ?rst lever, means for operating said second lever
for compressing the spring connection and re- ' spring connection and releasing said latch to
leasing said latch to move said element to the
other position with a snap action. ‘
5. In a device oi‘ the class described, an ele
55 ment biased towards. one position, a lever for
moving the element toward another position, a
latch to be engaged by said lever to prevent com
plete movement of the element to the other posi
move said element to said second extreme posi
‘ tion with a snap action.
' 10. In a device of the class described, an ele
ment movable between two extreme positions and 55
biased towards one of said positions, a lever for
operating said element, a latch to be engaged by
said lever to prevent complete and uninterrupted
tion, a second lever having a spring connection ' movement of said element to the other of its ex
treme positions, a second lever having a spring 60
connection with said ?rst lever, and means for
second lever for compressing the spring connec
operating said second lever to compress said
tion and releasing said latch to move said ele
ment to the other position with a snap action, spring connection, said last named means being
operative after compression of said spring con
and means for adjusting said latch for determin
nection to release said latch to move said ele 65
ing the amount of snap action movement.
ment to said other of its extreme positions.
6. In a device of the class described, an ele
11. In a device of the class described, an ele
ment biased towards one position, a lever for
moving the element toward another position, a ment movable between two extreme positions and
biased towards one of said positions, a lever for
latch to be engaged by said lever to prevent com
operating said element, a latch to be engaged 70
plete
movement
of
the
element
to
the
other
posi
70
tion, a second lever having a spring connection by said lever to prevent complete and uninten
with the ?rst lever, means for operating said rupted movement of said element to thelother of
its extreme positions, a second lever having a
’ second lever for compressing the spring connec
spring connection with said ?rst lever, means for‘
tion and releasing said latch to move said ele
ment to the other position with a» snap action, operating. said second lever to compress said 76
60 with the ?rst lever, means for operating said
4
2,116,605
spring connection, said last named means being
operative after compression of said spring con
nection to release said latch to move said element
to said other of its extreme positions, and means
for adjusting said latch for determining the
amount of snap action movement.
'
.
12. In a device of the class described, an ele
14. In a device of the class described, a valve,
means for actuating the same, and snap action
mechanism connecting said actuating means and
said valve, said snap action mechanism being ef
fective upon continuous movement of said actu
ating means in one direction to cause said valve
?rst to move gradually to an intermediate closed
ment movable between two extreme positions and ' position and then to move quickly to full closed
biased towards one of said positions, a lever for position with a snap action, saidv'snap action
10 operating said element, a latch to vbe engaged by mechanism being e?‘ective upon continuous move
10
said lever to prevent complete and uninterrupted
movement of said element to the other of its
extreme positions, a second lever having a spring
connection with said ?rst lever, means for oper
15 ating said second. lever to compress said spring
connection, said last named means being oper
ative after compression of said spring connection
to release said latch to move said element to said
ment of said actuating means in the opposite ’
direction to cause said valve ?rst to move with a
snap action to an intermediate open position and
.then to move gradually toward full open posi
tion, said snap action mechanism comprising 15
means for adjusting said intermediate closed po-'
sition independently of said intermediate open '
position.
other of its extreme positions, said latch compris- '
15. In a device of the class described, a con- '
20 ing a pivoted lever, an eccentrically mounted trolling element movable between ?rst and sec
20
abutment on said lever and means for rotating
said abutment whereby‘ the amount of snap
action movement may be adjusted.
13. In a device of the class described. a valve,
25 means .for actuating the same,‘ and snap action
mechanism connecting said actuating means and
said valve, said snap action mechanism being ef
fective upon continuous movement of said actu
ating means in‘ one direction to cause said valve
30 ?rst to move gradually to an intermediate closed
position and then to move quickly to full closed
position with a snap action, said snap action
' mechanism being effective upon continuous
' movement of said actuating means in the oppo
lsite direction to cause said valve ?rst to move
with a snap action to an intermediate open po
sition andthen to move gradually toward full
open position, said snap action mechanism com
prising means for ‘adjusting the di?erential be
40 tween said intermediate open and said interme
diate closed positions.
ond- extreme positions and operable to exert a
controlling action along the entire range or its
movement depending upon its position, means for
actuating said‘element, and snap action mecha
nism connecting said element and said actuating 25
means,_ said snap action mechanism being ef
fective upon continuous movement of said actu
ating means in one direction to cause said ele
ment to move gradually from said ?rst position
to. a ?rst intermediate position and then to move 30
quickly to said second position, said snap action ‘
mechanism being effective upon continuous move
ment of said actuating means in the opposite di- ‘
rection to cause said element ?rst to move with
a snap action to a second intermediate position
and then to move gradually to said ?rst posi
tion, said snap action mechanism comprising‘
means for adjusting said ?rst intermediate posi
tion independently of said second intermediate
position.
40
HUGH KELLY.
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