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Патент USA US2120213

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June 7, 1938.
2,120,213
L. W. EGGLESTON Er AL
CONTROL MEANS
Filed Sept. 28, 1933
2 Sheets-Sheet l
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INVENTORS
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ATTORNEY
_
June 7, 1938.
L. w. EGGLESTON El‘ AL
CONTROL MEANS
Filed Sept. 28, 1933
2,120,213
'
2 Sheets-Sheet 2
2,120,213
Patented June 7, 1938
UNITED STATES PATENT OFFICE.
2,120,213
‘
Lewis
‘
I
-
CONTROL MEANS
Eggleston and Earnest J. Dillman, De
troit, Mich. assignors to Detroit Lubricator‘
Company, Detroit, Mich., a corporation of
Michigan
Application September 28, 1933, Serial No. 691,350
17- Claims. (Cl. 200-81)
Our invention relates to new and useful im
provements in control means, and more particu
larly to a device for use in connection with and
toward the end wall 4, as shown in Figs. 1 and 2.
Extending from the partition 8 there is a substan
tially horizontal partition l0 connecting the same
for controlling the operation of a mechanical
to the end wall 4 and forming .with a front ver
refrigerating system.
tical partition II and with the partition 3 and
An object of our invention is to provide a de
the casing side walls a compartment or chamber
vice by which the average temperature of the
I 2. The forwardly extending partition 3 is
joined to the end wall 3 by a substantially hori
space or of the refrigerant evaporator may be
regulated or controlled.
Another object is to provide means for causing
defrosting of the refrigerant evaporator.
Another object is to provide a defrosting con
trol means operable in conjunction with the nor
mal control means for the system to permit auto
15 matically reestablishment of the normal refriger
zontal partition l3 adjacent the top of the casing.
Extending downward from the underside of the ‘10
bottom wall 2 at the end of the casing adjacent
the end wall 3, there is a substantially rectangu
lar, hollow element It having a substantially
cylindrical, internal bore 15 therethrough and
opening upward into the interior of the casing I. - ll
ating cycle-after the system has been defrosted.
The lower or bottom open end of the bore II
Another object is to provide a safety means
for stopping operation of the system in the event
is closed by a supporting plate or member ll,
preferably secured to the element It by screws,
or the like, l1. Mounted on the supporting mem
that the compressor is overloaded.
Another object is to provide means by which
the system may be manually started and stopped.
The invention consists in the improvedconstru'c
tion and combination of parts, to'be more fully
described hereinafter and the novelty of which
25 will be particularly pointed out and distinctly
claimed.
In the accompanying drawings, to be taken as
a part of this speci?cation, we have fully and
clearly illustrated a preferred embodiment of our
'
30 invention, in which drawings—
Figure 1 is a view of our novel control device
in front elevation, and having the front cover or
closure member removed to show the internal
construction;
35
'
Fig. 2 is. a vertical, central section on the line
2-—2- of Fig.4;
Fig. 3 is a detail view in vertical section on the
line 3-3 of Fig. 1;
Fig. 4 is‘ a view in vertical section on the line
40 2-4 of Fig. 1, showing the front closure or cover
member in place;
,
Fig. 5 is a detail top plan view of certain man
ual adjusting means, and
Fig. 6 is a detail bottom plan view in section on
45 the line 6-6 of Fig. 2.
Referring to the drawings by characters of ref
erence, l designates, generally, a main casing or
housing having a bottom wall 2, end walls 3, 4,
and a rear wall 5. The top of the casing is closed
by a substantially rectangular plate Gsecured to'
_ the casing by screws ‘I, or the like.
Within the
casing there is a partition 8 projecting forwardly
from the rear wall 5 and having its bottom or
underface 9 spaced vertically from the bottom
wall 2 and preferably inclined slightly upward
her It there is a power element or means, desig
20
nated generally l8, preferably comprising a sub
stantially cylindrical, circumferentially corru
gated, expansible-collapsible, resilient element
l9, such as a metal bellows, which is secured and
hermetically sealed by solder, or the like, at one 25
end, as at 20, to the supporting member It. The
other or upper end of the bellows I9 is closed and
sealed by a head member 2| having an externally
screw-threaded shank or stem 22 to receive an
internally threaded, ?anged sleeve 23 providing 30
a guide member and with the ?ange 24 thereof
serving as a stop. The sleeve 23 extends through
a guide aperture 25 in a guide and stop plate
member 26 fixed to the supporting member It,
the ?ange 24 cooperating with the member 23 to
limit upward movement of the head 2| and ex
pansion of the chamber 21 contained within the
power element. Through the supporting mem
ber [6 there is a central aperture ‘21' which re
ceives one end of a conduit member 21'’, having
its other end terminating at and in communica
tion with one end of a substantially cylindrical
bulb element 21¢. The other end of the element
2.‘!c is provided with a ?lling tube 2'!‘1 by which
the bulb element 21°, and the chamber 21 may
be charged with a suitable volatile liquid such as
.methyl chloride, after which the tube 21*‘ would
be hermetically sealed, for example by solder.
Screw-threaded as at 23, or otherwise secured.
in or to the head 2|, there is an upward project 50
ing thrust pin 29 having a substantially conical,
pointed end portion. The thrust pin 23 seats in
a substantially conical recess or socket 30 pro
vided in a bearing member 3i which is rigidly
secured to a lever member 32. The lever mem
2
aiaaais
ber 36. is provided with depending side ?anges
33, 3E. The lever member 32 is fulcrumed or
pivotally supported on a shaft or pivot pin 35
which extends transversely through the ?anges
33, 34 and which is supported at its opposite ends
in bearing bosses 38, 31 projecting from the end
wall 3, which are adjacent and'preferably inte
gral with the bottom wall 2. In the top face of
the bearing member 3| there is a substantially
conical recess or socket 38 which receives the sub
stantially conical, pointed end portion of a thrust
member 39 carried by and depending from a
spring follower member 40. Seating on the
member 48‘ there is one end of a helical coil,
15 spring 4| provided at its other end with a recessed
end plate 42 seating against an adjustable abut
'ment member 43, preferably in the form of a
screw, threaded and adjustably supported in an
internally threaded sleeve 44 secured in and
20
opening through the horizontal partition l3.
The spring 4| acts through the lever member 32
to resist operation of the lever member by the
power element l8 and determines the force re
quired to be exerted by the power element to
25 actuate the lever member, the spring 4i serving
as a range determining means.
The lever ?anges
33, 34 terminate substantially midway between
652 has universal movement between the plates 88
and isheld in position by means of a rivet, or the
like, (it provided with a convex head seating in a
concave recess in the member 63 directly over
the convex’, face 62. The opposite. end portions
of the supporting member 63 are provided on their
underfaces with contacts 65, 66 rigidly secured
thereto, as at B1, and electrically connected with
each other by means of the member 63 which is
of metal, preferably copper. The contacts 65, 1.9
68 cooperate with contacts 68, 89 carried by ter
minal posts '88, ‘II respectively secured in and
projecting through‘ apertures 12 in the bottom
wall 2. The posts 10 and "H are preferably rigid
ly ?xed in position by nuts ‘i3 screw-threaded
thereon, and each post is preferably provided
with a lead wire clamping a nut 14.
Also pro
jecting into the casing l through the bottom
wall 2 there is a third terminal ‘I5 having a simi
lar binding post nut; 16. The external ends of the 20
posts 78, ‘H and 15 are enclosed by a cup-shaped
cover member 11 having an opening 18 for the
passage of the electric lead wires. The post 18'
is preferably shielded from the posts ‘H and 15
by a partition 19 depending from the bottom 25
wall 2.
Vertically through the partition 8 and directly
above the lever member stepped portion 41 there
the casing end walls 3, 4 and are provided at their
terminal end portions‘with top and bottom stop ‘ is a cylindrical bore 80 which serves as a guideway
30 faces 45, 46 respectively which cooperate respec
for a plunger or thrust member 8! which normal
Iyseats on the stepped/portion 41. The upper
'the top face of the bottom wall 2 to limit the up- ' end portion of the bore 88 is of enlarged internal
ward and downward throw of the lever member diameter and internally screw-threaded, as at
32. Intermediate the side ?anges 33, 34 there is a 82, providing an upward facing, annular shoul
der 83. The thrust member 8i also has its up
35 downward stepped portion 41 which lies beneath
the partition 8 and which is spaced laterally from per portion of reduced external diameter to pro
the ?anges 33, 34. The end faces of the side vide an upward facing shoulder 84 on which is
?anges 33, 34 which are directed toward the end seated the lower, circur'nferentially ?anged end
of a spring follower sleeve 85. Surrounding the
wall 4 are provided with bearing notches 48, pref
erably substantially v-shaped, to receive the sleeve ‘85 and seating, on the circumferential
knife edges 49 of a lever member 58 fulcrumed ?ange thereof, there is a helical coil spring 86
which is held under compression and normally
thereby on the lever member 32. The lever mem
ber 58 is provided with an end recess 5! into acts to move the thrust member 8! downward.
which the stepped portion 41 extends, and it is The upper end of the spring 86 seats against a
" also provided with spaced guide ?ngers 52 which downward facing, annular shoulder 81 formed in
lie between and cooperate with the lever ?anges an externally threaded sleeve member 88 which
33, M. to prevent lateral displacement of the lever is screw-threaded into the threaded bore 82 and
members relative to each other and to maintain which is sleeved on the thrust membeis an. Sur
the knife edges laterally in engagement with rounding the upper end of the sleeve member
88 which projects above the partition 8 there is a
50 their respective bearing notches. Clamped to the
top and bottom faces of the lever member 50 collar 89 having radial and vertically extended
stop faces 90, 9| which cooperate with an abut
there are electric insulating plates 53, 54, pref
erably rigidly secured thereto by rivets, or the ment 92 carried by the partition l3 to limit rota
like, 55. Projecting from the side edges of the tion of the collar 89. The collar 89 is fixed to
the sleeve member 88 by a set screw, or the like,
55 lever member 58 there are opposite spring sup
porting arms 56. A pair of toggle springs 57, 93, see Fig. 3. A circular plate 94 which provides
preferably of the helical coil typepis provided, a ?nger grip for rotating the sleeve member 88 is
clamped to the top face of the collar 88 by a
each having one end secured to one of the arms
56, preferably by hooking the spring end through sleeve nut 95 which is threaded into the collar
89. The plate 94 is provided on its circumfer
60 eyelets provided in the arms. The other ends of
the springs 5‘! are secured to laterally extending, once with a pointed projection-96 which cooper
oppositely directed arms 58 projecting from the ates with suitable indicia 91 carried by the plate
bottom edges of the lever ?anges 33, 34 adjacent member 6 to indicate the direction of rotation of
the bearing member 3i. Positioned between the the sleeve member 88 which will result in a lower
or colder average temperature in or adjacent the
65 plates 53, 54 there is a spacer 58 of electric in
sulating material and through which one of the evaporator. The thrust member 8| projects above
pairs of rivets 55 is passed. The plates 53, 54 the clamping nut 95 and is provided on its upper
each have a portion projecting beyond the spacer end with a hand engaging abutment 98 by which
the thrust member 8| may be moved downward
“ 58 and toward the end wall 4, the projecting por
70 tions being of reduced width and designated 68. or into the casing. Projecting forward from the
Vertically through the under portions'?ll there is partition
with >- the H
partition
there is8 aand
hollow
containing
boss 98a aligned.
detent
tively with the inclined underface 8 and with
45
50
65
60
65
70
a circular aperture 6| which receives a convex\
bearing face 62 carried by a transversely extend
ing contact supporting member 63. The sup
porting member 53 by reason of the convex face
member I08 reciprocable in a guide bore “II
which opens at its inner end into the bore 80.
The inner end of the detent M18 is preferably .76
1
2,120,213
conical to provide a cam face which cooperates
with an inclined face I02 formed on the thrust
‘member 8| for a purpose to be described. In—
ward movement of the detent I00 is limited by
engagement thereof with an outward facing
shoulder I03 formed in the guideway IOI. A
spring I04 seats at its inner end in a cylindrical
recess in the outer face of the detent I00 and is
held under compression by means of a plug I05
adjustably screw-threaded, as at I08, in the en~
3
ment of the lever I24 and wheel I29. The lever
I24 carries a pawl I3I having a tooth I32 en
gageable with the notches in the‘ratchet-wheel
to normally maintain the lever I24 ?xed relative
to the shaft H6. The pawl I3I is pivotally car
ried by a stud I33 rigid with the lever I24 and
is normally urged into engagement with the
ratchet-wheel by a spring I34 having one end
engaging the lever I24 and its other end engaging
the pawl I3I. The shaft H6 is normally held I0
larged outer end portion of the guide bore ,I‘0I,
against rotary movement in the bore II5 by
such that the spring I04 normally urges the de
tent I00~ inwardly to the limit of its movement.
fusible means such as a solder seal between the
Within the compartment I2 there is a boss or
extension I01, preferably integral with the par
tition 8 and rising from the top face of the
partition I0 directly above the lever member 50.
In the extension I01 there is a vertical, upward
opened, cylindrical recess I08 which communi
cates at its-bottom end through a substantially
rectangular slot I09 with the interior of the eas
ing I beneath the partition I0. Vertically re
ciprocable in the slot I09 there is a lever mem
ber engaging or governing means I I0 which pro
jects downward through an aperture III in the
lever member 50 and which is provided at its
lower end with a lateral extension or arm I I2
for engagement with the underface of the lever
member 50 for a purpose to be described.
The
portion of the member IIO which is positioned
within the recess I08 is in the form of a hollow
rectangle and receives a helical coil spring II3
which is prevented from lateral movement by the
walls of the recess I08, and which is held under
compression between the bottom of the recess
I08 and the horizontal top portion II4 of the
member I I0 so that the spring I I3 normally tends
to move the member I I0 upward and the .arm I I2
.into engagement with the lever means 50.
Through the partition I I there is a bearing bore
H5 in which is journaled a shaft IIS, preferably
of electric insulating material, such as Bakelite.
The bore H5 is of slightly enlarged internal
diameter, as at II1, to receive a flange II8 car
ried by the member II8 to prevent longitudinal
movement of the member II6 into the chamber
I2. The member H6 is held in its bore by a
sleeve member II9 having a polygonal and pref
erably rectangular ?ange I20 which seats and is
secured in a rectangular recess I2I formed in the
outer face of the partition II. Embedded or
otherwise secured in the shaft II6 there is a me
inner face of the sleeve H9 and the circumfer
ential face of the shaft extension I22. The sleeve I I9 is surrounded by a resistance heating coil I35 15
having one ‘terminal connected to the binding
postv15 and having its other terminal connected
to the binding post 1|, the resistance wire hav
ing sufficient inherent rigidity so that no sup
port therefor is required to maintain it in the 20
desired position with the coil I35 spaced cir
eumferentially from the sleeve I I9. When a two
wire circuit is employed, the binding posts 10
and 15 are electrically connected so that the
heating coil I35 is in series circuit with the com-" 25
pressor motor of the refrigerating system.
The operation of our control device is as fol
lows: The bulb element 210 is preferably posi
tioned adjacent to or within the evaporator or
low side element so that the pressure generated 30
by the volatile ?uid therein will correspond to
the low side temperature. .As noted above, the
terminal posts H and 15 are electrically con
nected by a suitable lead wire, and the terminal
posts 10 and 15 are connected in series circuit 35
wi h the motor which drives the compressor of
tr e refrigerating system. Assuming that the sys
tem is at rest and at room temperature, for ex
ample, the parts will be in the positions illus
trated in the drawings.
If now the line switch 40
to the compressor motor is closed, current will
?ow through the motor, circuit contacts 58, 85,
thesupporting bridge member 83, contacts 80,
69, the resistance heating coil I35, to binding post
15, and thence back to line. The compressor will 45
now be operating and as the temperature of the
evaporator decreases due to operation of the sys
tem, the temperature surrounding the bulb ele
ment 21c will decrease. As the temperature of
the-evaporator decreases, the pressure of the vol 50
atile fluid in the bulb 21° and therefore in the
chamber 21 will also decrease. The force exerted
tallic, cylindrical extension I22 which projects by the volatile fluid in the chamber 21 and which
acts to maintain the lever means comprising the
' through the sleeve H9 and terminates adja
lever members 32 and 50 in the position shown 55
cent
the
front
wall
of
the
casing
I.
A
pin
I23
55
is passed transversely through the extension I22 ' will be opposed by the combined forces of the
and has its end portions in overlying, abutting springs H and 86. The component of force ex
relation to the free end of the sleeve 29 to hold erted by the combined toggle springs 51 and
the portion I20 in its recess I2I. Journaled on transferred to the line of action of spring 4I acts
in conjunction with the pressure in the chamber
60 the shaft II6 within the chamber I2 and in lat
eral engagement with the inside face of the par- ,, 21 when the lever means is in the position shown
tition II there is an operating lever I24 having to exert su?icient force on lever movement to
a finger engaging portion I25 projecting upward produce a snap action of the lever 32, that is, on
through a slot l26~in the cover member 6 and movement of lever 32 the said transferred com
by which the lever may be oscillated. The lever ponento-f force exerted by springs 51 decreases
I24 is provided with a finger or arm I21 which at a greater rate than the rate at which the force
overlies and engages the upper end of the oper-; ' of spring 4I decreases as the toggle point of the
ating member Hi), the member_IIO being held\
in engagement therewith by the spring H3. Be
yond the lever .124, the shaft I I5 ‘is provided with
a polygonal portion I28, preferably rectangular
to receive a star or ratchet-wheel I29 such that
the wheel is held against rotation relative to the
shaft
H5.
A pin I30 is passed - transversely
through the portion I29 to prevent endwise move
levers approaches the line of centers. When the
pressure within the chamber 21 plus the said
transferred component of ‘force of springs 51 de 70
creases to a point such that the upward force
exerted thereby on the lever member 32 becomes
equal to the» downward force of the combined
springs H and 86, then the lever member 32 will
move» downward; However, substantially at the
4t ,
time of, but just prior to, movement or the tog~ by spring til against upward movement of the
gle point or point oi engagement between the thrust member ill, the higher the temperature
lever members 32 and ill, through the line of surrounding the bulb element 271° will have to be
centers connecting pivot pin 35 and the switch in order to‘ move the toggle point over-center
contacts, the ?ange of sleeve 85 will engage the so that the toggle springs M can move the lever
upward facing shoulder 83 to stop further expan» member 5t downward to make contact between
sion of the spring 86, thereby eliminating any the contacts 65, 65 and 68, 69 respectively. When
further action of this spring through the thrust the force exerted on the lever member 32 by
the power element i8 becomes great enough to
member 8i upon the lever member 32. Move
ment of lever 32 up to this point of operation overcome the force of the range determining
will be gradual. The pressure existing in the spring 4i and the differential determining spring
chamber 21 must now decrease further before ~86, then the lever member 50 will be moved down
the force exerted by the spring 4| alone will be ward by the toggle springs 51 with a snap action,
su?icient to move the toggle point over-center. the springs 51 reacting on the lever member 32
When the force of the range determining spring to snap the same upwardly in a counter-clock
wise direction about its fulcrum 35, upward
ll acting upon the lever member 32 becomes suf
ilcient to overcome the pressure in the chamber movement of the member 32 being limited by
21, then the continued movement of lever 32 will engagement of the stop faces 45 with the inclined
result from the greater rate of decrease of the underface 9 of partition 8. The refrigerating
system will now again be in operation and the
component of force of springs 51 as above de
scribed, so that thetoggle point will be moved temperature in and adjacent the evaporator will
quickly to and through the line of centers with decrease with a resulting circuit breaking opera—
a snap action. As the toggle point snaps through tion of the control device, as above described.
center, the toggle springs~ 51 will snap the lever The force of the range determining spring“ is
member 50 upward, pulling the contacts 65 and preferably set at the factory by adjustment of I
the screw iii to provide the proper cutting out
66 quickly out of engagement with their re
spective contacts 68 and 69, thereby breaking the point for the refrigerating system, that is, to set
the low temperature limit of the evaporator.
motor circuit and stopping operation of the re
irigerating system. Upward movement of the The high temperature limit at which the sys
lever member 50 will be limited by engagement tem will be started or cut in may be manually
adjusted by rotation of the plate ilt, rotation of
of the member 50 with the lever member engag
ing means M0. The force of the springs 51] will the plate it in the direction of the arrow, Fig.
react on the lever member 32 to rotate the same
clockwise about the shaft 35 as the toggle point
breaks downward, the downward movement of
the member 32 being limited by engagement of
the stop laces 46 with the inside iaceioi the bot
tom wall 2. With the compressor at rest, the
10
20
25
so
5, or counter-clockwise, resulting in a colder or
lower average temperature within or adjacent the
evaporator. Counter-clockwise rotation or“ the at
plate 94 and therefore of the sleeve member 88
will relieve the tension on the spring 86 so that
the pressure within the chamber ill and required
motor having been stopped, the_ temperature to start operation of the system will be less and
within and adjacent the evaporator will com ‘ will be in accordance with counter-clockwise ro "iii
mence to rise causing expansion of the volatile tation of the plate lit. A stop 92 cooperable with
?uid within the bulb element El“ and a building the stop faces till, 9i rigid with the plate it serves
up
pressure within the chamber ill. When to determine the minimum and maximum tem
the pressure within the chamber 2i becomes perature at which the system may be operated.
equal to and slightly exceeds the downward force The function of the spring 86 is to provide what __
exerted by the range determining spring it plus is commonly referred to as a “cold control” for
ti downward component of springs bl trans~ the control device and refrigerating"system.
A defrosting control by which the temperature
‘re-cred to the line oi action oi springdi, then the
lever member
will be moved upward, lifting of the evaporator may be raised to a pointat
the point oi engagement between the lever mem= which the ice externally collected thereon will sov
and
toward the line or” centers. ‘This melt is provided and functions as follows: When
upward movement will be a quick substantially it is desired to defrost the rnachi‘ie or reiriger"
snap action ‘from initial movement of lever mem= ating apparatus, the plunger or thrust member 8i
of the
due to the said transierred component oi’ is moved downward or inward by
force decreasing at greater rate than the rate hand engaging abutment 98. As the thrust mem“
increase of force ‘pi spring (ii on the lever ber Si is moved downward, th high point of the
till. Since the‘ lower end of the thrust cam face ibil'will pass beyond or below the high
member Oi stands substantially on the line of point‘ of the detent tilt, the detent moving in
centers when the toggle mechanism is broken the
wardhigh
intopoints
engagement
pass each
withother,
the cam
such movement
W2
to
upwardly, as shown in
2, it is obvious that,
the line of centers when the toggle mechanism being caused by the compression spring tilt.
is broizen downward to switch opening position The thrust member 8i may be moved downward
respective of the position of the lever means,‘
will pass through the thrust member 8i above its
lower extremity. Therefore, prior to the toggle and if the switch contacts are in closed position
point or the. point of engagement between the - as shown, the downward movement of the thrust
lever members reaching the line oi’ centers, the member 8i will carry the toggle point below the
stepped portion M will engage the lower end of line of centers and cause the switch to be opened,
the thrust member Bi.‘ The‘ pressure within the thereby stopping the compressor motor. Regard
overcome the combined resistance or the spring
4! and'the spring 86 in order to move the toggle
less of whether the switch was in open or closed
position when the thrust member M was moved
inward or downward to effect defrosting oi the
point upwardly over-center. It will therefore.
system, the pressure inthe chamber 2'! requisite ‘
chamber 2'! must now build up suf?ciently to
be apparent that the spring lid determines the
differential operation of the control device/the
greater the tension or downward iorce exerted
to movement of the switch to closed position will
now have to be considerably greater than is re
quired for normal operation as the additional
5
2,120,218
force of the spring I04 acting through'the cam
surfaces must also be overcome. When the pres
sure in the chamber 21 has built up su?iciently to
force the detent I00 outwardly by the cam action
of the face I02, the force exerted by the power
element It will be su?icient to move the switch
to closed position with a continuous, uninter
rotated when sumcient force is exerted to ‘cam
the pawl I3I outward against“ the force of the
pawl spring I34. This manual movement of the
lever- I25 in a clockwise direction will lift the arm
I21, permitting the spring II3 to expand and lift
the arm II2 into contact breaking engagement
with the lever member 50. The switch may be
_ rupted movement as the force is greater than that
closed after manual opening of the same by
required to overcome the combined force of - movement of the lever I24 in a counter-clockwise
10 springs 4I and 88. When the defrosting temper ' direction upon the exercise of sufficient force both -10
ature has been reached, say 34 degrees F., at to cam the pawl I3I outward and into its next
which the spring I04 will be overcome, then the ,adjacent notch and to overcome the forced
parts will‘ move to the position shown in Fig. 3 spring II3.
and the normal operating cycle will be auto
What we claim and desire to secure by Letters
Patent of the United States is:
15 maticallyreinstated until such time as the plung
15
er BI is again moved inward for defrosting of the
1. A control device of the character described,
system.
.
comprising a control means, lever means for ac
. A combined manual control and automatic
tuating said control means, a power element for
electrical overload cut-out or safety device is
moving said lever means in one direction, means -
also provided, and their operation is as follows:
Should the compressor motor become overloaded
resisting operation of said element, a thrust
member operable on said lever means, means co
‘ for an appreciable time such as to‘ endanger the
operable with said resisting means-‘and acting,
motor, the current flowing through the coil I35
will increase. The increased current flow through
the coil I35 will raise its temperature sufficiently
through said thrust member to oppose operation‘
of said element, means to adjust the opposing
to heat and_melt the solder bond or fusible con
nection between the sleeve H9 and the shaft ex
tension I22. As the shaft extension I22 is re
' leased, the spring II3 will expand as it is no
longer opposed and will move the lever» member
engaging or governing means III) upward, bring
ing the arm I I2 into engagement with the under
side of the lever member 50 with su?icient force
to overcome’ the component of force exerted by
the toggle springs 5'I.and lift the lever member
50 upward about its knife edges to break contact
between the contacts 65, 66, and 68, 69 respec
tively, thereby breaking the compressor motor
circuit and stopping the refrigerating system.
force of said last-named means, and means en_- .
gageable with said thrust member for increasing
the resistance to operation of said element with
out increasing the resisting force exerted by said '
?rst-named cooperable- means.
2. A control device of the character described:
comprising a control means, lever means for ac
tuating said control means, a power element for
moving said lever means in one direction, means
resisting operation of said element, a manually
movable thrust member operable on said lever.
means, means cooperable with said resisting
means and acting through said thrust member to
oppose operation of said element, and .means co
operable with said thrust member upon manual
This upward movement of the engaging means. movement thereof toward said lever means for:
“0 will throw the'flnger engaging portion I25 of increasing the resistance to operation of said ele
the lever I24 toward the right, facing Figs. 1 and ment which is exerted by said first-named co
2, which is the "of!" position of the lever I24 and
indicates that the system has been either auto
matically stopped or manually stopped, as will be
described. The system may be again started by
manual movement of the lever I24 through the
medium of the portionr I25, by movement of the
portion I25 manually toward the left, facing Figs.
operable means.
a
-
3. A control device of the character described,
comprising a control means having two positions
of rest, a lever member having a fulcrum sup
port, a power element for moving said lever mem
ber in one direction to move said control means
to one of said ‘positions, means resisting opera
'50 1 and 2. As the lever is moved counter-clockwise,
or to the left as above stated, the pawl I3I will
ride over the adjacent projection on the ratchet
wheel and snap into position in the next notch,
taken in a counter-clockwise direction facing Fig.
2, which will result in a movement of the ‘arm
tion of said element and operable to move saidi
control means to the other of said positions, a
second lever member 'operatively connecting said
control means to said power element and said
I21 to the position shown in Fig. 2. Movement
on said second-named levermember and oper
able upon movement of said first-named lever
member to move said'second-named lever mem
ber, means to hold said control means in one
of said positions, and means acting on said first-'
named lever member to oppose operation of said
element.
4. A control device of the character described,
‘ of the arm I21 to the position of Fig. 2 can only
be effected by compression of the spring H3 and
downward movement of the lever engaging means
'I II to the position shown, which will release the
lever member 50 and permit the toggle springs
51 to close the switch in the event the tempera
- ture in or adjacent the evaporator is at or above
the maximum desired degree. The foregoing re
resisting means and pivotally supported by said
?rst-named lever member, spring means acting 55
comprising a control means, a lever member hav
setting of the, switch mechanism is, of course,_ ing a fulcrum support, a power element for mov
dependent‘ upon solidification of the melted
solder to reestablish'the bond between the sleeve
III and the shaft portion I22, otherwise the
ratchet-wheel I20 would rotate with the lever
I24‘and not hold against the force of spring I I3
upon release of the ?nger engaging portion I25.
Should it be desired to stop the system manually,
the lever I24 may be rotated clockwise of Fig. 2
'by the ?nger engaging portion I25. Since the
‘lever ‘I24 is iournaled on the shaft IIB, it may be
ing said lever member in one direction, means
resisting operation of said element, a second lever
member for actuating said control meansand
pivotally ‘ supported by said ?rst-named lever
member, spring‘ means-acting on said second 170
named lever member and operable upon move
ment» of said ?rst-named lever member to move
said second-named lever member, means acting
on said ?rst-named lever member to oppose op
eration of said element, and temperature respon- . 18
6
arsenic
_ sive safety means cooperable with and acting on
said second-named lever member‘ to actuate said
control means.
5. A control device of they character described,
comprising an electric switch, a lever member
having a fulcrum support, a power element for
moving said lever member in onedirection, means
resisting operation of said element, a second
lever member for actuating said switch and piv~=
otally supported by said ?rst-named lever mem
ber, spring means acting on said second-named
lever member and operable upon movement of
said ?rst-named lever member to move said/sec
end-named lever member, means acting on said
?rst-named lever member to oppose operation of
said element, an electric resistance element in
circuit with said switch, and means responsive
to temperature created by said resistance element
to move said switch to open position.
6. A control device of the character described,
comprising an electric switch, a lever member
having a fulcrumsupport, a power element for
moving said lever member in one direction, means
resisting operationof said element, a second lever
member for actuating said switch and pivotally
supported by said ?rst-named lever member,
spring meansacting on said second-named lever
member and operable upon movement of said
?rst-named lever member to move said second
80 named lever member, a reciprocable thrust mem
ber cooperable with said ?rst-named lever mem
ber, a spring acting upon movement of said
thrust member by said ?rst-named lever mem
ber to oppose operation or" said element, said
thrust member being manually operable to move
said switch to open position, and means oper
able upon manual movement of said thrust mem
ber to resist movement of said thrust member by
said ?rst-named lever member whereby to in
crease the force of said power element neces
sary to close said switch.
-
‘l. A control device of the character described,
comprising an electric switch, a lever member
having a i'ulcrum support, a power element for
moving said lever member in one direction, means
resisting operation of said element, a second le
ver member for actuating said switch and piv»
otally supported by said ?rst-named lever mem“
ber, spring means acting on said second-named
lever member and operable upon movement of
said ?rst-named lever member to move said sec
ondmnamed lever member, a reciprocable thrust
member cooperable with said first-named lever
member, a spring acting upon movement of said
thrust member by said ?rst-named lever Ki’l8l'i1==
ber to oppose operation of said element, said
thrust member being manually operable to move
said switch to open position, means operable upon
manual movement of said thrust member to resist
movement of said thrust member by said first—
named lever member whereby to increase the
having a fulcrum support, a power element for
moving said lever member in one direction, means
resisting operation of said element, a second
lever member for actuating said switch and pivu
otally supported by said ?rst-named lever meme
ber, spring means acting on said second~named
lever member and operable upon movement oi’
said first-named lever member to move said sec
ond-named lever member, a reciprocable thrust
member cooperable with said ?rst-named lever
member, a spring acting upon movement of said
thrust member by said first-named lever mem
ber to oppose operation of said element, said
thrust member being manually operable to move
said switch to open position, means operable upon 15
manual movement of said thrust member to re
sist movement of said thrust member by said
?rst-named lever member whereby to increase
the force of said power element to close said
switch, an electric resistance element in circuit
with said switch, means normally acting to move
said switch to open position, and fusible means
resisting said last-named means, said fusible
means responding to rise of temperature created
by said resistance element to release said last
named normally acting means.
9. A device of the character described, com
prising a control means having two positions, a
toggle mechanism including a lever and an arm
iulcrumed thereon, said arm being operatively 301
connected to said control means to move said
control means to one or the other of said posi
tions upon movement overccnter, a movable re
sistance member having a portion engageable by
said lever, means urging said resistance member .35
portion to a position intermediate the lines of
centers oi said toggle mechanism, said resist
ance member being engaged by said lever on
niovernent in one direction prior to movement
overcenter to oppose movement of said toggle dd
‘ mechanism in said one direction, and means to
limit movement of said resistance member by
said urging means short of overcenter movement
of saidrtoggle mechanism in the opposite direc-:
tion such that said resistance member will be dtli
ine?ective to urge said toggle mechanism over
center in said opposite direction.
iii. A device of the character described, com
prising a control means having two positions, a
toggle mechanism including a lever and
arm
iuicrumed thereon, said arm being operativeiy
connected to said control means to move said
control means to one or the other of said posim
tions upon movement cvercenter, a movable re“
sistance member having a portion engageable by
said lever, means urging said resistance member
portion to a position intermediate the lines of cen?
ters of said toggle mechanism, said resistance
member being engaged by said lever on move~
merit in one direction prior to movementover»
center to oppose movement of said toggle mech
force of said power element necessary to close said anism in said one direction, means to limit move“
switch, an electric resistance element in circuit, merit of said resistance member by said urging
with said switch, means responsive to tempera”
ture created by said resistance element to move
said switch to open position, said last-named re»
sponsive means having means cooperable with
said second-named lever member and operable
to overcome said spring means, and manna
means cooperable with said last-named means
to move said switch to closed position upon move=
ment or‘ said switch to open position by said last
named responsive means.
8. A control device of the character described,
‘comprising an electric switch, a lever member
means short of overccntcr movement oi’ said
toggle mechanism in the opposite direction such
that said resistance member will be ineffective to
urge said toggle mechanism overcenter in said
opposite direction, and means cooperable with
said resistance member to increase the opposition
to movement of said toggle mechanism in said 10'
one direction.
_
ii. A device of the character described, com
prising a control means having two positions, a
toggle mechanism including a lever and an arm
tulcrumed thereon, said arm being operatively 75
rs
2,120,213
connected to said control means to move said
control means to one or the other of said posi
tions upon movement overcenter, a movable re
sistance member having a portion engageable by
said lever, means urging said resistance member
portion to a position intermediate the lines of
centers of said toggle mechanism, said resistance
member being engaged by said lever on move
ment in one direction prior to movement over
10 center to oppose movement of said toggle mech
anism in said one direction, means to limit move
ment of said resistance member by said urging
means short of overcenter movement ‘ of said
toggle mechanism in the opposite direction such
15 that said resistance member will be ine?ective to.
urge said toggle mechanism overcenter in said
opposite direction, and means cooperable with
said arm to move said control means relative to
said lever.
12. In a device of the character described, an
20
operating lever, a control means operable by said
lever, a thrust member longitudinally reciprocal
in the plane of movement of said lever and en
25
gageable thereby, a spring urging said thrust
member into position for engagement by said
lever such that said spring will oppose movement
‘of said lever in one direction, means to limit
movement of said thrust member by said spring
in the opposite direction such that said lever is
moveable out of engagement with said thrust
member, means to actuate said lever, and means
to hold said control means in inactive position
irrespective of actuation of said lever by said
last-named means.
13. In a device of the character described, an
operating lever, a control means operable by said
lever, a thrust member longitudinally reciprocal
in the plane of movement of said lever and en'
gageable thereby, spring means urging said
thrust member into position for engagement by
40 said lever such that said spring means will oppose
movement, of said lever in one direction, means
to limit movement of said thrust member by said
spring means in the opposite direction such that
said lever is moveable out of engagement with
45 said thrust member, means operable without in
creasing the force exerted by said spring means
and cooperable with said thrust member to in
crease the resistance 01 said thrust member to
movement of said lever in said one direction, and
50 means to actuate said lever.
-
14. In a device of the character described, ‘an
operating lever, a control means operable by said
7
ment of said lever in one direction, means to limit
movement of said thrust member by said spring
in the opposite direction such that said lever
is movable out of engagement with said thrust
member, said thrust member being movable be
yond said limit of movement, means operable
upon such movement of said thrust member to
increase the resistance 01' said thrust member to
movement of said lever in said one direction,
and means to actuate said lever.
10
15. A control device of the character described,
comprising an electric switch, a lever member
having a fulcrum support, a power element for
moving said lever member in one direction, means
resisting operation of said element, a second lever 15
member for actuating said switch and pivotally
supported by said ?rst-named lever member,
spring means acting on said second-named lever
member and operable upon movement of said
?rst-named lever member to move said second 20
named lever member, means acting on said ?rst
named lever member to oppose operation of said
element, an electric resistance element in-circuit
with said switch, a spring under stress and tend
in to move said switch to open position, releasable 25
means holding said spring against movement, and
means responsive to temperature created by said
resistance element to release said releasable
means so that said last-named spring can open
said switch.
16.’ In a device of the character described, a
control means movable from and to predeter
30
mined positions, automatically acting means op
eratively connected to and for actuating said
control means, governing means for moving said 86
control means to one: of said positions in oppo
sition to said automatically acting means, said
governing means comprising a slide member,
means acting to move said slide member, a mov
able member having a stop position for holding 40
said last-named means against actuation, fusi
ble material securing said movable member in
said stop position, and a heating means for tus
ing said material.
1'11 In a safety device, a supporting member, a
tubular element mounted on said member and
held against movement about its longitudinal
axis, a rotatable member journaled in said ele
ment and projecting therefrom, fusible material
securing said rotatable member to said tubular
element, an operating element stressed for move
ment in one direction, means operable by said
rotatable member and opposing movement of said
operating element, and heating means for .i'us
ing said fusible material so that said operating
lever, a thrust member'longitudinally reciprocal
in the plane of movement oi‘ said lever and en
55 gageable thereby, a spring urging said thrust
element can move.
member into position for engagement by said
LEWIS W. EGGLESTON.
EARNEST J. DILLMAN.
lever such that said spring will oppose move->
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