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Патент USA US2412095

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Dec. 3, 1946.
2,412,095
R. w. MUERLE 1
PRESSURE SWITCH
Filed Feb. 23, 1942
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‘2,412,095
Patented Dec. 3, 1946
panel) STATES ’ PATENT OFFICE
PRESSURE SW'ITCH
Richard W. Muerle, Spring?eld, I_ll.,- assignor to
Montgomery Ward (SE-1C0.’ Incorporated, Chi
cago, 111., a corporation of Illinois
Application February 23, 1942, Serial No. 432,051
4 Claims. (Cl. 200-83)
I
1
This invention is directed primarily to preven
tion of clogging of ori?ces or apertures in the
baffle used for dampening sudden pressure varia
tionsin fluid pressure switch apparatus such as is
used on automatic water pumps, air compressors, I
and the like.
The invention is concerned particularly with the
type of apparatus having a switch operating dia
phragm forming part of a pressure chamber or
other expansible chamben. Such a pressure :10
chamber, in turn, communicates with a pump or
compressor, or with a pressure tank, through a
constricted ori?ce Or aperture in order to dampen
2
disadvantage that the small diameter holeclogs
readily, particularly when the water contains
such impurities as lime or other minerals, of cor
rosive composition. In actual use, the clogging of
these small holes leading to the diaphragm is
‘more frequent than would ordinarily be supposed,
and'it is a persistent source of trouble and danger
where-clogging and stoppage occurs. As the pres
sure'drops in the tank, the motor will start and
will not cut off, and dangerous pressures may re
sult. It will be appreciated that the smaller the
aperture, the more effective will be the damping
action and the more likely the aperture to clog.
Thus, by providing means preventing such clog
out the pump pressure pulsations before they can
reach the switch operating diaphragm. In such 15 ging, the aperture may be made smaller and more
effective.
devices the ori?ce tends to clog from corrosion or
It is therefore an object to provide a means for
caking, caused by foreign matter such as minerals
keeping
‘the ori?ce from the water way to the dia
and the like in the fluid beingpumped, and it is
phragm pressure chamber open.
the primary object to provide means to prevent
It is a further object of the invention to pro
clogging of such ori?ce.
vide
a diaphragm having means projecting into
In ordinary practice, a typical arrangement is
and automatically moving (with changes in pres
a pressure water system which comprises a, pump,
sure) in the ori?ce, which means operates to keep
an electric motor, a pressure tank, and a fluid
the
ori?ce open at all times.
pressure regulator or switch. This ?uid pressure
It-is-a further object in this connection, to pro
switch is connected to, or close to, the pressure 25 vide a diaphragm which has a wire or spring at
side of the pump-that is, the side of the ‘pump
tached thereto or operated thereby, in such ar
1 from which fluid is forced into the pressure tank
rangementthat the wire or spring extends into
after leaving the pump.
the ori?ce whereby movement of the wire will oc
‘Switches of this type usually are equipped with
cur under changes of pressure, forceably breaking
a standard switch mechanism in which the dia 30
loose any obstruction, deposit or corrosion tending
phragm is forced by ?uid pressure to exert the
to close the orifice.
necessary pressure on the standard switch mech
It is a further object to provide ‘such an ar
anism to actuate the switch. In this arrangement,
rangement
in which the wire is wavy or angular
the current pulsations of reciprocating pumps
or provided with projections or serrations which
may cause the switch mechanism to ?utter, par 35 serve to cut, scrape, or break the deposits of lime
ticularly if the tank is remotely located, in turn
causing arcing and burning of contact points and
consequent injury to the switch with possible fail
or other foreign material in a very efficient man
ner.
vIt is another object of this invention to provide
ure of the mechanism. In this connection, it is
not a rare occurrence for such arcing to lead to 40 a modified construction in which the pressure
chamber is intercepted by a disc or supplemental
fusing of the contact points of the switch, ‘result
diaphragm construction having one or more slits
ing in continued operation of the motor and build
or slots, the arrangement being such that move
ing up a dangerous pressure.
ment of the switch diaphragm distorts said in
To counteract or dampen these surges or pulsa
tions, it has been almost universal practice to re 45 termediate diaphragm, whereby lime and other
deposits and the like will be broken loose under
strict the water passage opening from the pump
the
stress of said distortion.
to thediaphragm pressure chamber of the switch
vOther objects and advantages of the invention
by inserting into the water way a. plug or disc in
will vappear as the nature of the improvements is
which is usually drilled a small hole, commonly
better understood, the invention consisting sub
50
from .010 of an inch up-depending on the power
stantially in the novel construction, combination
unit involved. This resists ?ow so that the pulsa
and arrangement of parts hereinafter fully de
tions are suf?ciently dampened to prevent ?utter
ing or flickering,
' While this arrangement above described is gen
erally satisfactory, it has the serious weakness or
scribed, illustrated in the accompanying drawing,
and ?nally pointed out in the appended claims.
In the drawing:
3
enacts
4
Figure 1 is a fragmentary sectional side ele
arating the contact points 25 from the contacts
vational view showing my improvement as ap
26 which are in turn ordinarily connected to
plied to a conventional switch, only a portion
the electrical starting and operating circuit of
of the switch mechanism being shown and the
a motor and thus providing a circuit breaking
cover or box being cut away;
Cl “snap action.”
Figure 2 is an enlarged side elevational view
When the upward pressure is taken 01f of the
showing a desirable form of projecting wire
upwardly extending pronged plate l8, as by
member or ori?ce cleaner which attaches to the
downward movement of the diaphragm l9, the
diaphragm;
pressure spring l2 will move the rocker arm l6
Figure 3 is a bottom view of the device of 10 downwardly at its outer end shifting the mov
able arm 23 and thereby change the direction
Figure Ll is a fragmentary perspective view
of pressure on the spring 22, thus moving the
showing one form of my device as applied to
movable arm 23 and causing the contact points
the diaphragm of a conventional pressure switch;
25 to snap into contact position with the con
Figure 2;
Figure 5 is a plan view of ‘a modi?ed con
struction showing a disc member with slits or
slots;
15 tacts 26, in the position shown in Figure l.
The diaphragm is securely held in place on the
housing H by means of a cover plate 27, which
Figure 6 is a fragmentary side elevational view
is in turn held in place by small bolts 28, as
showing the device of Figure 5 applied to a
will be seen in Figure 4. The diaphragm L3 is
conventional switch mechanism; and
20 pressure responsive and ?ts over an opening 29,
Figure 7 shows a schematic arrangement of
see Figure 4, in the housing Ii, preventing
a pump and motor with a pressure switch (of
the type described herein) attached, the View
water entering the switch housing and damag
ing the mechanism. The cover plate 27 forms,
with the diaphragm It, a pressure chamber 30,
being a side elevational view.
Referring more in detail to the construction 25 sometimes herein referred to as diaphragm pres
shown in the various ?gures, there is illustrated
sure chamber. The switch housing is coupled to
an embodiment of the invention as applied to
a pressure line from a pump or pressure tank by
a conventional fluid pressure switch. Figure '7
pipe means, or otherwise, 3! (see Figure 7 ) which
illustrates a typical ?uid system in which a
threads into or otherwise attaches to the inlet
switch of this type is embodied. The device 30 32 of the pressure chamber 39. The pressure
shown in Figure '7 comprises a motor ’112, the
chamber proper is separated from the pressure
pump 43 and a storage tank for water and the
line or pipe 3!, preferably at the inlet 32, by
like 1215. This tank 44 is the pressure tank to
means such as a ba?ie or plug 33 as shown in
which the switch (here shown in its entirety
Figures 1, 2, and 4. The baffle 33 ordinarily
as switch tit) is attached. Conventional elec 35 is provided with a hole or opening of small size,
trical connections lead from the switch 45 to
but suf?ciently large to permit water under pres
the motor 42, and the pressure line or pipe 3|
sure to pass therethrough from the pressure line
connecting the pressure tank to the switch, as
or pressure tank, whereby the pressure in the
hereinafter more fully described, is shown.
pressure chamber 30, is varied according to the
Referring next to Figures 1 and 4, in par 40 pressure in the pressure tank or pump, as the
ticular, the switch 45 comprises a switch housing
case may be. Change in pressure in the pres
ll, shown here in fragmentary form. One con
sure chamber 33 operates to move the diaphragm
ventional switch embodiment comprises a pres
l9 thus actuating the switch mechanism. The
sure spring i2, which is held in position by means
constructions now commonly on the market are
such as a bolt l3, attached to the switch hous
arranged in the above described manner. the
ing i I. This bolt I3 is provided with a nut It
opening or hole being only large enough to
threaded on the bolt, and a washer or’ferrule
re?ect a change in pressure rather slowly, but
I5. The-tension of' the spring i2 is adjustable
by threading the nut I4 up or down on the bolt
IS.
The spring l2 exerts downward pressure on
one end of a rocker arm I 6, tending to resiliently
bias the rocker arm to one position. This rocker
arm is journaled at I‘! and is movable about the
journal as an axis within the limits permitted
by the other mechanism of the switch.
A diaphragm plate or base [8 is provided with
upwardly extending prongs 20 resting against the
rocker arm IS. The pronged plate I8 is situated
not being large enough to allow pulsations‘ from
the pump or other vibration in the water system
to move the diaphragm it suddenly or materially
by changing the pressure in the pressure cham
ber 30, and by vibrations cause ?ickering of the
switch mechanism with consequent damage to the
switch, and the other objections heretofore
@ mentioned.
In the past, the most serious objection to the
arrangement above described has been that most
water systems carry water with more or less
mineral content such as lime, or carry corrosive
on or attached to a diaphragm l9 and moves 60 water and the hole or opening in the bevel be
therewith. In the ordinary construction of the
switch the rocker arm I6 is bifurcated, and there
are two upwardly extending prongs from the
comes plugged and closed. If this should happen
when the pump is running, a dangerous pressure
would be built up in the system because the liq
uid pressure in the pressure chamber 39 would
The rocker arm It‘ is attached to a spring 65 not vary enough to move the diaphragm and cut
member 22 which, in turn, engages a movable
off the motor. ‘
arm 23. This movable arm 23 preferably is
To remedy this situation, I provided means for
pivoted on trunions 2e, and the opposite or free
keeping the hole clear of closing obstructions, such
end of the arm carries a contact point or points
as the projecting member 34 shown in detail in
25.
a
70 Figures 2 and 3. This member 34 is attached to
In actual operation movement of the rocker
the pressure chamber side of the diaphragm l9
arm 16 upwardly under pressure of the pronged
and extends through the hole 35 in the ba?ie 33.
pronged plate 18.
plate I8 (or otherwise), shifts the direction of
pressure on the spring 22, causing the movable
arm 23 to move downward at its free end, sep
Preferably this projecting member 34 is in the
form of a wire long enough to extend to the hole
75 35 regardless of the position of the diaphragm
2,412,095
5
19 within the limits of normal operation. The
projecting member 34 is preferably provided with
the crimps, serrations, small undulations, wrin
kles or the like, such as shown at 3B. These, in
moving through the hole 35, serve to break loose
scale or deposits tending to plug the hole 35, or
to scrape the hole clean, whereby the ‘hole is
maintained open at all times.
A simple arrangement for attaching the pro
6
While I have herein shown and described cer
tain features of my invention, still I do not wish
to limit myself thereto, except as I may do so
in the claims.
I claim:
1. In combination with a switch having ?uid
pressure actuated electrical contact means in
cluding a movable diaphragm, baiile means be
tween said pressure responsive means actuating
jecting member 34 to the diaphragm I9 is pro 10 said electrical contact means, and a source of
?uid pressure, a hole in said baiiie means for the
vided by the use of coils, as shown in Figure 3,
passage of ?uid under the pressure therethrough,
which may be fastened to the diaphragm by any
said hole being restricted in size whereby the ?ow
convenient'means such as by the retaining mem
of fluid in response to pressure changes is re
ber 31 preferably made of leather or fabric ma
stricted, and means maintaining said hole open
terial, metal or the like, and attached to the
against clogging due to deposits of foreign ma
diaphragm l9 in any convenient means such as
terial,
said means comprising a wire formed into
by sewing, cementing or bradding. In the ar
a spiral base, and a centrally extending crimped
rangement shown the coils of the projecting
portion, said base being secured to said dia
member 34 ?t between the retaining member 31
phragm, and the crimped portion extending into
20
and the diaphragm l9, with the projecting por
said hole and adapted to move with respect to
tion containing the crimps 34, passing through
said hole upon movement of said diaphragm.
the retaining member 31.
2. In an electrical switch of the type actuated
Obviously, burrs, serrated edges and the like
by pressure transmitted through a movable dia
would be effective instead of the crimps 36, and
phragm, the improvement which comprises the
are believed to be the equivalent of the crimps 25 combination of ba?ie means provided with a
for the purposes herein described.
surge-dampening ori?ce and a cleaning pin ex
The member 34 may be made out of stainless
tending through said ori?ce and attached to and
steel, spring wire, or other suitable materials and
movable with said diaphragm, said pin being of
instead of the coils, may consist of a disc with
sinuous contour so that foreign matter adhering
a projecting member. While elimination of the 30 to the periphery of said ori?ce will be broken
crimps 35 still presents an improved arrange
ment over the devices now on the market, the
preferred embodiment having the crimps seems
superior.
The ba?le 33 may be constructed of metal,
Bakelite, or other material having sufficient
strength to resist sudden changes in pressure
away by the movements of said pin and so that
there will always be an opening on at least one
side of the pin, whereby permanent plugging of
said ori?ce is rendered substantially impossible.
3. In a switch having movable fluid pressure
responsive means and electrical contact means
lactuated by said movable pressure responsive
caused by pump vibrations, or the like, and
means, the improvement which comprises bailie
dampen such vibrations.
means positioned between said pressure respon
In the modi?ed construction shown in Figures 40 sive means and a source of fluid pressure, said
5 and 6 the switch mechanism is the same but
means being provided with a hole for the pas
I have provided a disc 33 which is preferably
sage of ?uid under pressure, said hole being re
made of light springy material such as a very
stricted in size whereby the ?ow of ?uid in re
light gauge spring steel. The disc takes the place
sponse to pressure changes is retarded and re
of the ba?ie 33 as will be clearly apparent from
stricted, and cleaning means mounted upon and
Figure 6. Said disc contains slits 39, which are
carried by said movable means extending into
preferably small and serve the purpose of the
said hole for maintaining said hole open against
hole 35.
clogging due to deposits of foreign material, said
In order to keep the slits 39 from closing" with
50 cleaning means being sinuous in form at such
lime deposits, corrosion or the like, the diaphragm
portions as extend into and through said hole,
19, which is separated from the disc by the an
whereby said cleaning means may catch upon and
nular ring 40, is caused to bear against the center
break away foreign deposits tending to clog said
portion of said disc by one or more lugs 4 l. These
hole upon movement of said cleaning means rela
lugs 4| may be either attached to the diaphragm
tive to and axially of said hole.
l9, or the disc 38, or both, whereby the move
ll. In a ?uid pressure operated device having a
ment of the diaphragm will distort the disc, caus
pressure chamber at least a portion of one wall
ing shearing action between the portions on op
whereof is movable, means providing an ori?ce
posite sides of the slits, which will serve to break
for admitting and emitting ?uid under pressure
the scale or deposits loose from the diaphragm
for actuating said movable wall portion, and
surface as well as the slits and keep the water
cleaning means extending into said ori?ce and
way open.
movable axially thereof in response to movement
The form of the invention herein shown and
of said wall portion, said cleaning means com
described presents a preferred embodiment
prising a crimped rod, the movement of which
thereof, and delineates its adaption to practical
axially in said ori?ce acts to break away foreign
use, but it is to be understood that the present
matter and deposits and thereby to clean said
disclosure is to be considered from the illustrative
ori?ce.
standpoint and not as imposing restriction or lim
RICHARD W. MUERLE.
itation on the invention.
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