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Патент USA US2118492

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.May 24, 1938.
2,118,492
K. CLARK
OPERATING MECHÀNISM
Filed Jan. 27, 1936
32
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INVENTOR.
KEA/04u. CLA RK
ATTORNEY.
2,118,492
Patented May 24, 1938
UNITED STATES PATENT OFFICE
2,118,492
OPERATING MECHANISM
Kendall Clark, South Bend, Ind., assignor to In
ternational Engineering Corporation, Chicago,
Ill., a, corporation of Illinois
-
Application January 27, 1936, Serial No. 60,977
8 Claims. (Cl. 10S-183)
This invention relates to operating mechanism
for pumps and the like, as for example those used
in heating apparatus. An object of the invention
is to provide such a mechanism which is simple,
5 durable, effective, quiet, that will provide a source
of high pressure oil for an oil burner under a
constant uniform pressure, and which requires a
minimum of attention.
In the arrangement illustrated, the pump pis
10 tons (or their equivalent) reciprocate side by side,
and are connected to leaf springs, preferably of
several laminations each, actuated by an eccen
tric between the springs and of such a size that
when one spring is bowed by the eccentric to
15 draw its piston down into its lowermost position
the other spring will be straight with its piston in
its uppermost position. Suitable valves are asso
ciated in a novel manner with the pistons and
their cylinders.
20>
One leaf` of each spring, in the specific arrange
ment shown in the drawing, preferably the one
opposite the eccentric, is secured at its ends to
pins removably mounted in the piston and in the
end of the pump housing, to exert the necessary
tension on the piston when the spring is bowed.
25
The pump may be mounted, in a suitable cas
ing forming part of a heater or burner apparatus,
to deliver fuel to a suitable burner, with the eccen
tric driven through reduction gearing by the
30
armature shaft of a motor which preferably also
would otherwise be necessary to even out the pul
sating delivery from the pump if ordinary coil
springs had been used.
The above and other objects and features of
the invention, including various novel combina
tions of parts and desirable particular construc
tions, will be apparent from the following descrip
tion of the illustrative embodiment shown in the
accompanying drawing, in which:
Figure l is a section through the novel pump, 10
in a plane including the axes of the two cylinders,
and on the line I--I of Figure 2; and
Figure 2 is a vertical section longitudinally
through part of a heater mechanism, showing the
fan, motor, and pump in side elevation.
15
'I'he part of the heater mechanism illustrated
includes a cylindrical casing III for guiding a cur
rent of air to a suitable burner, (not shown), to
which fuel is delivered from the outlet I2 of a
novel pump I4 having an intake I6 connected to
a suitable source of such fuel.
The pump is operated, as described below,
through reduction gearing I8 driven by the arma
ture shaft 20 of a relatively high speed motor 22
arranged within the casing I6. The other end
of the shaft drives, in any desired manner, a fan
24 arranged to circulate a current of air through
the casing ID past the pump I4 and the heat
exchanger.
The novel pump I4 comprises a housing 26, the 30
drives an air-circulating fan.
upper end of which is formed as two cylinders 28
The piston displacement of the pump is prefer
ably greater than the volume of oil required vby
arranged side by side and containing pistons 30.
Each cylinder 28 has at its top an outwardly
opening spring-pressed ball check valve 32, past
the oil burner atomizing means. The pump is so
proportioned that the oil in the cylinders is main
tained under a constant pressure, for example by
a multiple leaf Euler column spring or the like,
as it is being delivered on the upstroke to the
atomizing tip, and with the delivery of one cyl
40 inlcîer preferably overlapping the delivery of the
ot er.
‘
The multiple leaf Euler 'column spring which I
prefer to use may be considered as a` multiplicity
of long slender axially loaded columns whose
45 lengths are great with respect to their radius of
gyration. The Euler column is stable and will
hold any axial load up to its critical load without
bending. At the critical load, the Euler` column
may be bent by buckling, and it will be stable and
50 support the critical load in any position up to the
degree of bending where its fibers fail in com
pression. In this manner, the axially loaded bent
Euler column may be used as a loading device or
spring that will exert an even and constant axial
55 push over a short axial displacement.
The multiplicity of Euler 'column springs ax
ially pushing against the pump piston maintain
an even and constant oil pressure in the cylinder
and hence to the tip, thereby eliminating the
60 necessity of a pressure regulating valve that
25
which fuel may be fed to the outlet I2, While each 35
piston «has an inlet opening therethrough con
trolled by a suitable upwardly-opening spring
pressed ball check valve 34.
In the base of each piston is mounted a plug
36 (perforated or otherwise formed to permit 40
the passage of fuel), engaged by the upper end of
a laminated leaf spring 38, of the type known as
a “Euler” spring, the lower end of which engages
a plug 4I) secured in the bottom of the housing
26. The right and left springs are designated 45
“R” and “L” respectively. The outer lamination
of each spring is formed at both ends with eyes
or hooks engaging pins 42 driven transversely into
seats formed in the plugs 36 and 40. The lamina
tions of the springs may be held by clips 39. The
plugs 36 and 4I] are formed with projecting ledges
confining the ends of the inner laminations of the
springs. The plugs 36 do not fill the openings in
the bottoms of pistons 36, but leave passages
around their sides.
Between the springs 38 is rotatably mounted
an eccentric end roller or the equivalent 44 and
45 respectively, driven by the reduction gearing
I8, and of such a size that when one spring 38
is straight, with its piston 30 at the upper end 60
2
2,118,492
of its stroke, the other spring 38 is bowed to its
maximum curvature, with its piston 30 at the
lower end of its stroke.,
The rotation of the eccentric 44 bends the
take of a fluid on the inward stroke of the piston
and then forcing it out under pressure on the
outward stroke of the piston.
4. A pump having valve controlled inlet and
outlet openings and a pair of movable pistons
spring unit 38R, the outer leaf of which is an
chored to pins 42. The bending of the spring Y arranged side by side, a leaf spring for each pis
3BR, causes the piston 30 to be displaced down
ton attached at one end to its piston and held at
ward, and oil is drawn past the check valve 34
into the cylinder 28. Further rotation of the
10 eccentric 44 rolls it clear of the spring 38R. and
starts bending spring 38L. Spring 38B. now be
ing clear of the eccentric 44 is free to exert an
axial thrust against the plug 36 in the base of
its other end, and a rotating eccentric arranged
between and engaging the springs and of such
a size. that when one spring is substantially
straight with its piston at the outer end of its
stroke the other spring is bowed by the eccen
tric to draw its piston to the inner end of its
stroke, each of said springs including a plurality
piston 3D, which exerts a pressure on the oil in
15 cylinder 28.
of laminations, and each of said springs being
The oil is forced from the cylinder 28 under
secured at each end between a projecting ledge
and a removable pin.
5. A pump having valve controlled inlet and
outlet openings and a pair of movable pistons ar
ranged side by side, a leaf spring for each piston 20
attached at one end to its- piston and» held at its
other end, and a rotating eccentric arranged be
tween and engaging the springs and of such a size
that when one spring is substantially straight
with its piston at the outer end of its stroke the
other spring is bowed by the eccentric to- draw
its piston to the inner end of its stroke, each of
an even and constant pressure pastv check valve
32 to outlet I2 and thence to an atomizing tip or
to some other useful purpose.
20
Since the displacement of the pump is greater
than the volume of oil‘ required by the atomizing
tip, piston 3BR will not have completed its up
ward stroke before piston 30L starts its upward
stroke, thereby providing an overlapping of dis
252 placement strokes and insuring an uninterrupted
pressure.
Springs SUL and 38H, are duplicates and con
sequently will develop equal pressures in- both' cyl
inders, and an uninterrupted and even flow of oil
under pressure through outlet I2 to the oil burner
atomizing tip or other device.
It will be seen that a very simple and quiet
mechanism has been provided through which the
motor reciprocates the pistons to feed the fuel to
36, the burner, or an equivalent operation.
said springs including a plurality of laminations,
and each of said springs being secured at each
end between a projecting ledge and a removable 30
pin, one leaf of eachl spring being secured to the
two pins at its ends so that it may exert ten
sion thereon..
6. A pump having valve controlled inlet and
outlet openings and a pair of movable pistons
While one illustrative embodiment has been
arranged side by side», a leaf spring for each
described in detail, it is not my intention to limit
the scope of the invention to that particular em
bodiment, or otherwise than by the terms- of the
piston attached at one end to its piston and held
` appended claims.
I claim:
1. A pump having Valve controlled inlet and
outlet openings and a pair of movable pistons
arranged side by side, a leaf spring for each
, piston attached at one end to its piston and
held at its other end, and a rotating eccentric
arranged beween and engaging they springs and of
such a size that when one spring is substantially
straight with its piston at the outer end of its
stroke the other spring is bowed by the eccentric
to draw its piston to the inner end of its stroke.
2. A pump having valve controlled inlet and
outlet openings and a. pair of movable pistons ar
ranged side by side, a leaf spring for each piston
55 attached at one end to its piston and held at its
other end, and a rotating eccentric arranged be
tween and engaging the springs and of such a
size that when one spring is substantially straight
with its piston at the outer end of its stroke the
60 other spring is bowed by they eccentric to draw
itsl piston to the inner end of its stroke, each of
said springs including a. plurality of laminations.
at its other end, and a rotating eccentric arranged
between and engaging the springs and of such
a size that when one spring is substantially 40
straight with its piston at the outer end of its
stroke the other spring is bowed- by the eccentric
to draw its piston- to the inner end of its stroke,_
each of said springs including a plurality of
laminations',> and each of said springs being se
cured at each end between a projecting ledge
and a removable pin, the leaf. of each spring fur
thest from the eccentric being secured to the two
pins at its ends so that it may exert tension
therein.
7. A pump- comprising a pair of cylinders, valvev
controlled inlet and outlet openings in said cyl
inders,l pistons in said cylinders, a pair of leaf
springs, each engaging one of the pistons and
adapted to be bowed toV move the pistons in a
direction to draw fluid into the cylinders and to
straighten to- force fluid out oi the cylinders,
and means for alternately cyclically bowing the
leaf springs.
8. A pump comprising a cylinder having a pis 60
ton therein, a support spaced from said piston, a
leaf spring consisting of a plurality of lamina
3. A pump or the like having a pair of movable
tions and having one lamination attached- at one
pistons arranged side by side, a leaf spring for
65 each piston attached at one end to its piston and
held at its other end, and a rotating eccentric
arranged between and engaging the springs and
end to the piston and attached at the other end>
of such a size that when one spring is substan
tially straight with its piston at the outer end
70 of its stroke the other spring is bowed by the ec
centric to draw its piston to the inner end of its
stroke, each of said pistons being arranged in a
cylinder, and each cylinder and piston having as
sociated therewith valves for permitting the in
to the support and having the other laminations 65
of the spring in thrust engagement at their op
posite ends with the piston and the support, and
means engaging the spring between its ends to
bend the spring to> cause said one lamination to
retract the piston, the piston being advanced by
the thrust of all of said laminations in the
straightening of the spring.
,
KENDALL. CLARK.
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