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Патент USA US2121259

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June 21, 1938.
'
F, A, PARSONS
2,121,259
THERMOSTATIC ELEMENTS
Original Filed June 26, 1950
LINVENTOR
M 6?. PM
“4,2221%,
ATTORNEYS
2,121,259
_ Patented June ‘21, 1938
PATENT OFFICE
UNITED STATES
2,121,259
.
THERMOSTATIC ELEMENTS
Fred A. Parsons, Milwaukee, Wis. _
Original application June 28, 1930, Serial No.
483,976. Divided and this application May
24, 1934, Serial No. 727,256
_
(Cl. 297-16)
This invention relates to improvements in 'diiierent metals, preferably resilient and neces
thermostatic elements. The present application sarily having dlil'erent coeii‘icients of thermal ex
is a division of my application No. 463,976 ?led pansion. The minor helix or helicoidal member
11 Claims
June 26, 1930.
The object of the invention is to provide a
5 helical form of thermostatic element which will
give an axial response and may be made either
to expand or to contract its length in response
to an increase in temperature.
More particularly stated, it is the purpose of
10 the invention to provide a bimetallic thermo
static element which will give a relatively large
response to given temperature change while oc
cupying relatively small space, such response
being attributable to the winding of the thermo
15
static element into helical form and then wind
ing the helix into a larger helical form, the di<
rection of response being determinable accord
ing to which one of the metallic components of
go the bimetallic strip is outermost in the original
helix.
In the drawing:
Figure 1 is a side elevation of a thermostatic
mentioned is so wound that one metal lies out
side the coil and the other inside the coil, the 6
different metals being indicated at 35-36 in
Figs. 2 and 3.
The minor helix or helicoidal member is then
itself axially coiled helically to comprise a major
helix wound in the form of a helical spring or
peripherally continuous hollow member, as indi
cated at 32 in Fig. 1. The bimetallic spring so
made will expand or contract in the direction of
the axis of the major helix when the tempera-_
7
ture of the
structure is changed. It may be
1
stated that the described result in the major -
helix is due to the fact that the winding of the
minor helix is such as to produce a torsional or
twisting effect along the axis of the minor helix
when the temperature changes.
'
In accordance as the one or the other metal is
25 with fragmentary portions shown in axial sec
tion of a suitable mounting for the element.
Figure 2 is an enlarged view of the element in
end elevation.
Figure 3 is an enlarged detail view in side ele
positioned outside or inside of the minor helix,
the major helix will expand or contract along its
axis when heated. It may be assumed that
reference character 35 indicates the metal having
the lesser coeilicient of thermal expansion, while
reference character 36 indicates the metal hav
ing the greater coe?icient of thermal expansion.
It will be noted that the positions of these metals
30 vation of a single coil element. '
are reversed as between Figs. 2 and 3.
I
element embodying this invention in association
Like parts are identi?ed by the same reference
characters throughout the several views.
The casing fragmentarily shown at l0 carries
pins 26 and 21 upon which the spring seat mem
ber 25 is guided for adjustment under the con
35
trol of the threaded portion 29 of an adjusting
shaft M.
The thermostatically adjusted member 20 is
guided for axial movement with reference to the
seat member 25 by means of lugs 2l—22 engaged
40
in complementary notches 23-44 of the member
25. Members 25 and 20 have anchorage pegs 33
and 34 with which the thermostatic element 32 is
engaged .at its’ ends.
45
'
mounting may be employed, the mounting illus
trated having been reproduced from the drawing
of the above entitled parent application for pur
poses of exempli?cation only.
50
‘
It will be understood that any other suitable
'
The de- \
vice shown in Fig. 2 will tend to expand axially
along its axis when heated, while the device
shown in Fig’. 3 will contract axially valong the
axis of the major helix when heated.
Inasmuch as it is very desirable in some me
chamcal installations to have a thermostat which
will contract at a rapid rate when heated and
will expand correspondingly when cooled, it will
be obvious that the disclosed construction has
advantages never heretofore realized. Obviously
its overall coe?lcient of contraction when wound
as shown in Fig. 3 is as great as its overall co
e?icient of expansion when wound as shown in
Fig. 2. In either direction the degree of move
ment produced in- response to a given tempera. 45
ture change is very great in proportion to the
amount of space occupied by the element.
I claim:
1. A thermostatic control member comprising
The thermostatic element 32 to which this in
a bimetallic strip twisted to form a helicoidal
vention particularly pertains, is conveniently
member which is coiled in a generally'helical
made by first winding a minor helix, in this case '
form.
of relatively small diameter, out of a narrow
strip of any well known bimetallic metal, com
55 prising two integrally jolnedstrips or sheets of
-
2. ‘A thermostatic control member comprising
a bimetallic strip twisted to form a relatively
long helicoidal member of relatively small di
50'
2
2,121,259
ameter, said helicoidal member being axially
coiled to form a peripherally continuous hollow
member, the length of which changes with temj
perature.
~
3. A thermostatic element comprising a hol
low axially expansible member comprising con
volutions of an elongated thermally torsional
member, said thermally torsional member com
prising a hollow body constituted of a continu
10 ous bimetallic strip.
4. As a new article of manufacture, a thermo
static element comprising a bimetallic strip
wound to constitute an elongated and substan
tially helicoidal member in which the metal of
15 said strip having the greater coe?lcie'nt of ex
pansion is exposed outwardly, said member be
ing coiled bodily in generally helical form to
constitute said element.
5. As a new article of manufacture, a thermo
static element comprising a bimetallic strip
wound to constitute an elongated and substan
tially helicoidal member in which the metal 01'
said strip having the lesser coe?lcient of ex_
pansion is exposed outwardly, said member being
coiled bodily in generally helical form to con
stitute said element.
6. A thermostatic element comprising strips of
metal of diil'erent coe?lcients of thermal expan
sion rigidly connected along their length and ex
tending progressively about a first axis which in
turn is extended progressively about a second
axis.
7. A thermostatic element comprising strips of
metal of different coe?lcients of thermal expan~
35 sion rigidly connected along their length and ex
tending progressively about a first axis which in
turn is extended progressively about a second axis,
said strips together comprising a bi-metallic
thermostatic spring having an axial thermo
static expansion and contraction together with
such resilience as is inherent in the metal oi said
strips.
.
8. A thermostatic element comprising strips 01'
metal of different coe?icientsof thermal expan
sion rigidly connected along their length and ex
tending progressively about a first axis which in
turn is extended progressively about a second
axis, said strips together comprising a bi-metallic
thermostatic spring having an axial thermostatic 10
expansion and contraction together with such re
silience as is inherent in the metal of said strips,
one of said strips being outside of the other
throughout the extent of the spring.
9. An element of the character described, com
prising a member in the form of a helix with an
open center and subject to torsion when exposed
to a changed environmental condition, said mem
her being bodily formed into convolutions to com
prise said element, whereby the twisting of said
member occasions a change in the overall length
of said element from one end of said convolutlons
to the other.
.
10. As a new article of manufacture, a thermo
static element contractible along its axis when 25
heated and comprising a bimetallic helix elon
gated in the direction of its axis and composed
of a coiled strip of bimetal, the portion of said
strip with greater coe?lcient of expansion being
‘so disposed that said helix will contract when
heated.
.
11. As a new article of manufacture, a bi
metallic helix of axially elongated form compris
ing a succession of axially progressing coils, at
least one of which has at least one loop about
an axis transverse with respect to the axis of said
coils.
FRED A. PARSONS .
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