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Патент USA US2118792

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May 24, 1938.
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E, c_ HORTQN
SNAP ACTION
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2,118,792
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Filed- May 1, 1936
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INVENTOR
@ IYErWm Clrior’mn,
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A ORNEYS
Patented May 24, 1938
UNITED STATES PATENT osmos
2,118,792
SNAP ACTION '
Erwin C. Horton, Hamburg, N. Y” assignor to
Trico Products, Corporation, Buffalo, N. Y.
Application May 1, 1 936, Serial No. 177,456
10 Claims. (01. ‘14-100)
the power port 4 to the piston chamber i? at one ‘
This invention relates to a power switching or ‘side of the piston i3, and 'in'the other position
valve action for electric or fluid motors, such as connecting such 'power port to- the chamber at
‘for windshield cleaners, fuel pumps, and the like, the opposite side of the piston. The piston in
~and is particularly designed for use in small mo
this particular illustration embodies spaced pack
tors, such as might be useful for a motor vehicle
5
ings which are connected by a link N that is vpro
vided with a rack l5 for meshing engagement with '
accessory.
Various designs of snap action have heretofore
a pinion "5' on a power take-off shaft ii.
been made wherein a spring has been utilized to
The spring has its opposite ends anchored for
pivotal movement, as on pins 6 and i8, and its in 10
effect a quick shift of the power or pressure vdif
10 ferentialfor reversing the power drive of a re
termediate portion bowed sideways, the distance
between the anchor pinsbeing less than the nor
action has usuallylembodiedfa spring which was _ mal length of the spring, so that when the spring’
moved bodily across a dead center position im
is mounted, it will'be held under compression and,
mediately prior’to the shift of the snap mech
therefore, bowed laterally. The line of spring 15
anism. This ‘shift not only ‘necessitated addi
force is shifted back and forth by buckling the
tionalpower-‘because the spring was required to bow ?rst to one side and then to'the opposite
be tensioned to aconsiderable degree, but it was side of the plane of anchorage for the spring
also possible for the snap mechanism to arrest it
ends, a guide plate it serving to ‘constrain or
self in a dead ‘center position vand thereby stop "guide thefbowing action to a plane substantially 20
ciprocatory type of motor.- The previous snap
15
themotor."
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parallel with‘ the movement of the member it.
This piston actuated member it is provided with
.
The present invention has for its object to pro
vide 'a snap action which obviates these objec
spaced actuator'shoulders 20, which alternately "
tions, and further, to provide a snap action which
‘engage the bowed portion of the spring ‘do-effect
the desired shift in the line of spring force, said
is emcie'nt in operation‘ and of simpli?ed con
25
struction.’
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The invention comprehends the direct appli
This will_ "cause
such
cent one of its anchorages.
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cationu‘of' the spring force to impart the shifting "adjacent end portion-oi the spring to ‘pivot about
movementkof thepcwer switching elemenn'and it ‘the adjacent‘ anchorage and across the plane
comprises the‘ salientfeaturesof ‘construction and ‘of spring anchorage independently of’ the, re
v
‘
30
the arrangements] and combinations of parts maining portion of the spring which'latter por
hereinafter more fully described, reference being
tion will follow with a sinuous or serpentine
had to the accompanying drawing, wherein-f
movement and terminate in a ?nal whipping ‘ac
Figi‘lis an elevation of the improved'snap ac- , , tion as the trailing end is snapped across such
tionapplied ‘to a-?uid type of motor, portions of
35
as
shoulders 2i! 'c‘ontacting‘the bowed spring adja
.
the ‘latter being in section;
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.
Fig. 2‘is a transverse sectional view through
the snap action;
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plane;' This ?nal whip of the spring is utilized to 35
effect the desired change-over in theapplication
of the power and to this end a pair of shoulders
2i may be provided on the valve i in the vpath of
the whipping portion o'f’the spring to be alter
‘
Fig. 3 is‘ a fragmentary detail of a part time
motor; and i"
_
nately engaged thereby;
Figs. 4 and 5 are schematic views of the inven
40' tion
embodied in, another form of power switch
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40
1 '
This provides a construction in which the
spring force progressively moves from one end to~
the opposite,- culminating in a ?nal whipping
ing embodiment.
,
..
Referring more particularly to the drawing, the
away from one-valve shoulder 2i ‘and against the.
numeral 1! vdesignates a power switching‘ mem
companion shoulder to quickly, shift the valve to 45
4.5 ber in the form of a valve for alternately con- , its new position, wherein the valve stop shoulder
necting the chamber ports 2 and 3 with a power it will be in: engagement with/the stop 8 and the
line port it, which ports‘ open through a, common formerly unconnected port 3 will be in communi‘
valve seat '5.‘ The valve is movably mounted as cation with the power supply port it, vwhile the
on a‘ pivot B which projects from the body ‘i, and formerly connected port 2 will be opento the at 50
mosphere. This will result. in a reversev move
50 the valve is limited in its movements by the op
positely facing ends of a stop 8 that is interposed
ment of the piston until the spring» is againen
between the shoulders Q and in on the valve. A
gaged from the opposite direction by the trailing
spring ' Ii is provided for shifting or rocking the
valve back and forth between its two‘ operative
‘ .actuatorshoulder it.
55 positions; in one, position the valve connecting ‘
I
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.
As a means for arresting the action of the mo
2
2,118,792
tor the con?ning plate I9 is pivotally mounted on
the pin Sand supports the pin l8 so that the
latter may be shifted to one side or to a position
across which the actuator It cannot eifectively
shift the spring. A limiting pin 22 operating in
a slot 23 in the plate |9 will serve to de?ne the
extent of pivotal. movement of the con?ning plate
from a motor arresting position to a motor op
erating position. The con?ning plate may there
10 fore be termed a parking member and is provided
the invention or restricting the same beyond the
scope of the appended claims.
What is claimed is:
'
a
1. A snap action for moving a power transmit
ting member back and forth between two posi
tions, comprising a pair of stationary supports
?xedly spaced, a spring anchored at each of its
opposite ends on said supports and normally held
in a laterally bowed position thereby, said spring
adapted to be buckled to the opposite side of the
plane of anchorage, means engageable with the
with'an eye 24 in which may be engaged a push
and pull wire leading to an accessible point.
bowed spring portion adjacent one point of an
Figs. 3 and 4 show a slightly modi?ed embodi
ment of the invention and more clearly depict chorage for moving the adjacent end portion of
15 the sinuous whipping action of the spring. In the spring across such plane to initiate a pro
these views the spring 3| is anchored at one end gressive independent advance of a wave of spring
by a pin 36 and at its opposite end in a seat 38 motion toward the opposite point of anchorage
provided in the parking or arresting member 39. with a sinuous movement whereby the opposite’
end portion of the spring is ?nally moved across
The actuator 34 for initiating the whipping ac
20 tion of the spring may be provided with an open
such plane with a snap action, and means con
necting such opposite end portion of the spring to 20
ing 30 to receive and guide the spring in its move
ments. In Fig. 4 the spring is shown in solid said power transmitting member to effect a quick
lines as having begun its serpentine progression movement of the latter from one of its positions
and moves to the broken line position. In Fig. 5 to its other position. ‘
25 the parking member is depicted in its two posi
2.' A snap action for moving a power transmit
tions. The power switching member 32 has the ting member back and forth between two posi 25
driven shoulders 33 to receive the impact and tions, comprising a spring anchored at its oppo
site ends on ?xed points vof support and normally
driving force of the spring in its ?nal whip.
held
in a laterally bowed position thereby, means
In both forms of the invention illustrated the
30 spring movement from adjacent one point of engaging with the bowed spring portion adjacent
anchorage toward the other point of anchorage
is in the nature of a wave of motion which travels
from the point of power application to the point
of work application. The initial movement of
the spring forms the wave and imparts a motion
thereto which travels toward the opposite end of
the spring where its work is accomplished. The
spring being cramped between its two anchorages
so as to bow to one side of the plane of the
40 anchors, creates the work imparting wave as it
buckles across to its opposite bowed position.
With the improved snap action it is impossible
to obtain a “dead center” position wherein the
spring will fail to act in either direction since
one point of anchorage for moving the adjacent .
end portion of the spring across the plane of
spring anchorage to initiate a progressive advance -
toward the opposite point of anchorage of a wave
of spring motion with a buckling sinuous move
ment whereby the opposite end portion of the‘
spring is ?nally whipped across such plane solely
by the inherent resiliency of the spring itself,
and means providing a play connection between
the whipped end portion and said power-transmit
ting member to permit a preliminary idling move
ment of the whipped end portion prior to acting
upon such‘powe‘r transmitting member to effect
a shift of the latter from one of its positions to »
its other position.
45 the spring begins its independent movement, free
3. A snap action comprising a power trans
of the actuator, while the latter is still moving,
and because the spring does not have to go mitting member movable from one to the other of
through an abnormal compression or tension two positions, a spring pivotally anchored at both
when buckling across. As long as the actuator ends and held under compression bowed to one
50 or connecting member I‘ is moving against the side of the plane of anchorage solely by the in
spring the latter is progressively advancing in herent resiliency of the spring itself, said spring a
its spring shifting movement from the lower point being movable to a bowed position on the oppo
of anchorage l8 toward the upper point, and site side of such plane with a sinuous movement
when the advance. has reached its critical point, by which a wave of motion advances from one
55 the piston is still moving until ?nally the spring anchored end to the opposite anchored end, means
engaging the bowed portion adjacent one end for
automatically continues its sinuous movement in rocking
such portion of the spring across the
dependently of the actuator I4 ‘and whips the. plane to initiate such sinuous movement of the '
upper end away from one shoulder 2| to the spring and permitting a continuance of the sin
companion shoulder with su?lcient force and ra
uous movement automatically under the impulse
pldity of movement to shift the valve I to its of the spring independently of said initiating
new position. After the sinuous movement has means, and means for connecting the bowed por
begun, the spring is free in itself to continue such tion of the spring adjacent the opposite point of
movement automatically and independently of anchorage to said power transmitting member.
mechanical parts until the shoulder 2| in ad
4. A snap action comprising a power transmit
vance. is impacted, and this impact is accom
ting member movable from one to the other of
plished with su?icient force to readily accomplish two positions, a spring pivotally anchored at both
the desired shift. By reason of the buckling ac .ends and held bowed to one side of the plane of
anchorage under compression, said spring being
tion the normal length of the spring is practical
maintained without subjecting it to abnormal movable by buckling to a bowed position on the
70 1y
compression or tension.
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opposite side of such plane with a sinuous move
70
While the invention has been described much ment, means acting on one end portion of the
spring
between
its
points
of
anchorage
for
in deta?, it will appear obvious that the inventive
principles here involved will be applicable to other buckling the same to initiate such sinuous move
75 physical embodiments without‘ departing from ment and permitting'a continuance of the sinu
ous movement automatically under the impulse 76
anavoe
or the spring independently of said initiating
ting member movable from one to the other of
means, and means acted upon by the opposite end
portion of the spring during the ?nal part of the
sinuous movement to so move said power trans
anchorage under compression, said spring be
mitting member.
two positions, a spring pivotally anchored at both
ends and held bowed to one side of the plane of
ing movable by buckling to a bowed position on
the opposite side of such plane with a sinuous
movement, means engaging one portion of the
'
5-. A snap action comprising a power transmity
ting member movable from one to the other of
. two positions, a spring pivotally anchored at both
spring for buckling the same to initiate such 1
ends and normally held bowed to one side of the
sinuous movement and permitting a continuance
plane of anchorage under compressiomsaidspring
being movable by a progressive buckling initiated
the impulse of the spring independently of said
of the sinuous movement automatically under 10
initiating means, means for connecting another
near one end and progressing with a sinuous
portion of the spring to said power transmitting
movement to the opposite end to dispose the
member for whipping action subsequent'to said
spring in‘a bowed position on the opposite side
buckling whereby the membgr will be quickly
15 of suchvplane‘, means connecting the spring to
ment, and means for rocking one end portion in
dependently oi? the other end portion to initiate
the buckling movement of the spring.
ineffective upon the spring whereby said spring
is supported against operative buckling by said 20
6. A snap action having a spring clamped be
tween spaced anchorages to how the spring later
ally and adapted to be buckled to the opposite
side oi the plane of anchorage with a wave of
25 motion progressing from adjacent one point of
' anchorage toward the other point of anchorage,
with means for. initiating the wave of motion
from one point of anchorage, and other means
actuated by the spring during the wave of mo
tion and subsequent to the initiation of such
wave.
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15
shifted‘from one position to another, and means
ioryshifting one of the anchored ends with re
spect to said buckling means to render the latter
the power transmitting member for actuating the
latter by the ?nal portion of such sinuous move
so
3
.
‘I. A snap action for moving a power transmit»
ting member back and ,i'orth between two posi
tions, comprising a spring anchored at its oppo
site ends and normally held in a laterally bowed
position, said spring adapted to be buckled to
t e opposite side of the plane of anchorage,
means engageable with the bowed spring por
tion adjacent one point of anchorage for mov
ing the adjacent end portion of the spring across
such plane to initiate-is. progressive independent
advance of a wave of spring motion toward the
opposite point of anchorage with a sinuous move
ment whereby‘the opposite end portion oi’ the
spring is ?nally snapped across such plane with
buckling means.
9. A snap action having a spring clamped be- '
tween spaced anchorages to bow the spring
laterally and adapted to be buckled to the oppo
site side of the plane of anchorage with a wave
of motion progressing from adjacent one point
of anghorage toward the other point of anchor
age, with means for initiating the wave of mo-.
tion, other means for being actuated vsubsequently
by and during the wave of motion, and means for 30
disposing said spring inoperative with respect
to said initiating means whereby the latter is in
effective on said spring.
10. A snap action for moving a power trans
mitting member back and forth between two posi 35
tions, comprising a spring supported at each of
its opposite ends in a relatively non-resilient
anchorage and normally adapted for one end por- .
tion of it to be buckled to the opposite side of the
plane of anchorage, means engageable with the
bowed spring portion adjacent one point ct
anchorage for moving the adjacent end portion
of the spring across such‘ plane to initiate a‘
progressive independent advance of a wave oi.
spring motion toward the opposite point of
anchorage with a sinuous movement whereby
the opposite end portion of the spring is ?nally
snapped across such plane‘ with a whip, and
member to effect a quick movement of the latter means conn acting such opposite end portion oi.’
irom one or its positions to its other position, and the spring to said power transmitting member
means for shifting one of the anchored ends
laterally to a point from which said moving . to effect a quick movement of the latter irom one
means is ine?ective and said spring is thereby oi its positions to its other position.
supported against such sinuous movement.
WW @3. HQRTGN.
a whip, means connecting such opposite end por
tion or the spring to said power transmitting
a. A snap action comprising a power transmit~
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