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Патент USA US3055218

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Sept. 25, 1962
D. |_. WATSON ETAL
3,055,206
APPARATUS FOR MEASURING CHANGES IN WEIGHT OF
SAMPLES AS A FUNCTION OF TEMPERATURE
Filed Aug. 14, 1958
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Sept. 25, 1962
D. L. WATSON ETAL
3,055,206
APPARATUS FOR MEASURING CHANGES IN WEIGHT 0F
Filed Aug. 14, 1958
SAMPLES AS A FUNCTION OF TEMPERATURE
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3,055,206
Patented Sept. 25, 1962
2
motor and heater control relays for the ovens in an
apparatus according to this invention.
3055 206
APPARATUS FOR ll/iEA’SURING CHANGES IN
A prime purpose of the present invention is to provide
an instrument for measuring and automatically recording
WEIGHT 0F SAMPLES AS A FUNCTION OF
TEMPERATURE
Donald L. Watson, Bethesda, and Joseph L. Tyrrell, Riv
changes in weight of 'a sample (1) as a function of tem
perature, programmed for a selected heating rate, and
erdale, Md., assignors to American Instrument Co.,
Inc, Silver Spring, Md.
Filed Aug. 14, 1958, Set. No. 754,987
16 (Ilaims. (Ci. 73-15)
This invention relates to apparatus for measuring
changes in the weight of samples due to temperature
changes thereof, and more particularly to an interchange
able furnace arrangement for such apparatus.
A main object of the invention is to provide an im
proved apparatus for measuring changes in weight of
samples due to temperature changes thereof, said appa
(2) changes in weight as a function of time at a selected
constant temperature.
The instrument consists primarily of a highly precise
spring balance enclosed in a glass chamber for opera
10 tion at controlled temperatures under vacuum or in gase
ous atmospheres, at, or below ambient pressure, a pair of
interchangeable furnaces, and a linear transducer ar
ranged to convert spring de?ections, proportional to sam
15
ple weight, into electrical signals. These signals, to
gether with those corresponding to sample temperature
or time are applied to the inputs of an X-—Y recorder,
ratus being simple in construction, being arranged so
that consecutive determinations of changes in weight of
samples may be accomplished without delay due to cool 20
ing of the associated furnace means, and providing a reli
able means for accurately measuring changes in Weight
of samples as a function of temperature.
A further object of the invention is to provide an im
which traces a Cartesian coordinate graph depicting their
relationship.
The pair of interchangeable furnaces allow consecutive
determinations to be made without delay, since a cool
furnace may be rapidly substituted for the heated furnace
of the last determination, allowing the new determination
to proceed immediately.
Referring to the drawings, the furnace-supporting as—
25 sembly is designated generally at 11, and comprises a
in weight of samples due to change in temperature there
horizontal base plate 12 and a horizontal top plate 13,
of, said apparatus being provided with multiple heating
forming part of the framework of the apparatus. Secured
ovens and with means for readily substituting one oven for
proved apparatus for measuring and recording changes
between the top plate 13 and the ‘base plate 12 is a vertical
another in the system whenever required, whereby con
cylindrical column member 14 provided with the
secutive determinations may be made without the delay 30 tubular,
bottom cap 15 and the centrally apertured top cap 16.
involved in allowing an oven to cool down to a speci?ed
A reversible electric motor 17 is mounted on the top plate
starting temperature.
13, and is drivingly coupled, through a suitable gear
A still further object of the invention is to provide
reduction unit 18 to the reduced top end 19 of a vertical
an improved interchangeable furnace arrangement for an
shaft 20‘ rotatably mounted axially in the tubular column
apparatus for measuring and recording changes in weight
14. Said shaft has a reduced bottom end portion 21
of samples due to increase or other change in temperature
which is journalled in a bearing bushing 22 mounted cen
thereof, said arrangement being especially useful in mak
trally in the bottom cap 15.
ing consecutive determinations of the change in weight
A relatively large annular disc 23 is secured on base
with temperature of samples in studies such as corrosion
plate
12 around the lower portion of tubular column 14.
of metals, thermal decomposition of inorganic and or
ganic compounds, solid-state reactions, roasting and cal
cination of minerals, thermochemical reactions of ceram
ics and ceramic-coated metals, pyrolysis of coal, petro—
leum and wood, determination of moisture, volatiles and
ash, absorption, adsorption, and desorption properties
40
The shaft 20 is formed with screw threads 24 which
threadedly engage with a nut member 25 slidably dis
posed in the lower portion of column 14, said nut member
being provided with a pair of diametrically opposed out~
wardly projecting radial pins 26, 26 which extend through
45 opposed vertical slots 27, 27 formed in the lower portion
of materials, rates of evaporation (drying curves), and
of column 14, preventing rotation of the nut member and
sublimation, latent heats, thermal degradation of natural
causing said nut member to be moved axially in the col
and synthetic polymers, and the like.
umn
responsive to rotation of shaft 20‘. Said pins 26,
vFurther objects and advantages of the invention will
26
supportingly
engage in respective diametrically 0p
become apparent from the following description and 50 posed vertical notches
28, 28 formed in the bottom edge
claims and from the accompanying drawings wherein:
of a collar member 29 slidably mounted on the tubular
FIGURE 1 is an elevational view, partly in vertical
column 14.
Designated at 30 is a generally rectangular block mem
according to the present invention and diagrammatically
slidably and rotatably engaged on the column 14 and
illustrating the associated elements of the apparatus for 55 ber
supported
on the collar 29. At its lower portion said
measuring changes in weight of samples, of which the in—
block
member
is provided with inwardly projecting di
terchangeable oven arrangement forms a part.
cross-section of an interchangeable oven arrangement
FIGURE 2 is a vertical cross-sectional view taken on
ametrically opposed elements 31, 31 slidably engaging in
the slots 27, 27 and preventing rotation of the block mem
line 2-2 of FIGURE 1.
ber when it is in an elevated position, for example, as
FIGURE 3 is an enlarged cross-sectional view, partly 60 shown in FIGURE 2. The column member 14 is formed
in elevation, taken on line 3—3 of FIGURE 2.
with an annular groove 32 at its lower portion registrable
‘FIGURE 4 is a horizontal cross-sectional view taken
with and adapted to receive said lug elements 3-1, 31 when
on line 4-4 of FIGURE 3.
the collar member 29 is lowered into engagement with
FIGURE 5 is a vertical cross-sectional view, with parts
the disc member 23, allowing the block member 30‘ to
65 be rotated at this time, as will be presently described.
broken away, taken on line 5-5 of FIGURE 4.
FIGURE 6 is a horizontal cross-sectional view taken
A depending pin member 33 secured in the bottom of
on line 6-—6 of FIGURE 3.
block member 30 engages in a substantially semi-circular
FIGURE 7 is a horizontal cross-sectional view taken
guide groove 34 formed in the top edge of collar mem~
on line 7—7 of FIGURE 1.
ber 29, as shown in FIGURES 3 and 4, guiding the block.
FIGURE 8 is a schematic wiring diagram showing the 70 member for rotation through an angle of 180° relative
electrical connections associated with the oven changing
to the collar member when it is in its lowered position.
3,055,206
.
3
.
.
Rigidly secured to opposite sides of the block member
30 are respective supporting brackets 35a, 35b having
outwardly extending horizontal plate-like portions 36a,
36b adapted to support respective annular, generally cy
lindrical electric oven members 37a, 37b, said oven mem
bers being received in respective enclosures de?ned on
said plate-like portions 36a and 3612 by spaced upstanding
retaining lugs 38 provided on the edges of said plate-like
portions.
4
is connected by a wire 66 to one pole 67a of a two-pole
main control relay 68. The associated stationary contact
69a of relay 68 is connected by a wire 70 to one station
ary contact 71 of a two-position limit switch 72 having
a pole 73 and having an additional stationary contact 74.
Upper contact 63b is connected by a wire 75 to the other
pole 67b of relay 68. The associated stationary contact
6912 is connected by a wire 115 to one stationary contact
76 of a two-position limit switch 77' having a pole 78 and
Designated at 39 is a vertical elongated glass sample 10 having an additional ‘stationary contact 79. Stationary
chamber which is suitably mounted by means not shown
in a position such that its lower portion will be received in
one of the oven members 37a or 3712 in the elevated posi
tion of block member 30, as shown in FIGURE 1.
contact 74 is connected to pole 78 by a wire 80.
As shown in ‘FIGURE 2, the respective limit switches
72 and 77 are secured to diametrically opposite portions
of a supporting collar 80' mounted on column member
. As will be presently described, the block member 30 15 14 just above the upper limiting position of block mem
may be lowered to a position wherein the lugs 31, 31 may
ber 30. An upstanding abutment member 81 on said
enter the groove 32, the descent of the block member being
block member is respectively engageable with the depend
su?icient to allow the sample chamber 39 to be complete
ing operating plungers of said limit switches in the two
ly withdrawn from said one oven member. The block
uppermost positions of said block vmember. Thus, in the
member and brackets 35a, 35b may then be rotated 180 20 position illustrated in FIGURES 1 and 2, the abutment
degrees to bring the other oven member into vertical
member 81 engages the operating plunger of switch 72
alignment with the stationary sample chamber 39, after
and causes its pole 73 to engage contact 71, as shown in
which, with a new sample of material placed in the sample
chamber, the other oven member may be elevated to the
FIGURE 8. When the operating plunger of switch 72
is released, pole 73 engages contact 74.
position of FIGURE 1, allowing another determination 25. Similarly, when abutment member 81 engages the de
to be made while the ?rst oven member is cooling down.
pending operating plunger of switch 77, pole 78 engages
The sample chamber 39 includes a suspension spring
contact 76. In the released position of said switch 77,
40 to which are attached the sample crucible 4-1 and the
pole 78 engages contact 79, as shown in FIGURE 8.
tare crucible 42 by means of a supporting cable element
Mounted on one side of block member 30 are the addi
43 and the transducer armature ‘44. The armature 44 is 30 tional limit switches 82 and 83, the outer switch 83 having
supported coaxially in the transducer coil 45 which is
a depending operating element 84 which is engageable in
mounted on a reduced portion 46 of the sample chamber
one or the other of two recesses 85 and 86 formed in
diametrically opposite peripheral portions of bottom disc
and which is connected in a conventional manner through
a demodulater 47 to one of the input stages (weight) of
member 23 when the block member 30 is in its lowermost
an X—-Y recorder 48. The sample thermocouple 49 is 35 position and when one or the other of the furnaces 3711 or
37a is in vertical registry with the chamber 39. The other
connected to the other (temperature) input stage of the
limit switch 82 has a depending operating element 87
X--Y recorder 48.
The cable element 43 is provided with suitable weight
engageable with disc 23, to disengage its pole 88 from
its stationary contact 89 when the block member 30 is in
calibrating means 50 and with damping sleeve means 51
coacting with cooperating sleeve means 52 mounted in 40 said lowermost position.
the sample chamber to prevent undesired transient oscil
lations ‘of the supporting cable '43.
_ The pole 90 of switch 83 engages its associated con
55 which may be connected to a suitable controllable
energizing source and programming device 56 at re
or 86.
tact 91 in all positions of the block member 30 except
when the block member is rotated, in its lowermost posi
Sample chamber 39 may be connected to a vacuum
tion, to cause the switch-operating element 84 to engage
pump 53 for evacuating the interior of the chamber.
Each oven member 37a and 37b is provided with a 45 on the top surface of disc 23. Switch 83 remains closed
when element 84 engages in either of the recesses 85
heating winding 54 and with a controlling thermocouple
Switch pole 90 of limit switch 83 is connected by a wire
92 to the line wire 64. Switch poles 73 and 88 are con
spective terminals 57, 58 and '59 as shown diagrammatical
50 nected together by a wire 93, which is also connected to
ly in FIGURE 1.
_ While FIGURE :1 shows a diagrammatic arrangement
wherein the respective furnaces 37a and 3712 may be man
ually ‘connected in turn to the energizing and program
ming device 56, FIGURE 8 illustrates a circuit arrange
contact 91 of limit switch 83. Contact 71 of limit switch
72 is connected by a wire 94 to relay contact 69a.
Designated generally at 95 is a three-pole, three-posi
tion, ‘manually operated switch having the respective
ment wherein respective individual control relays 60a and 55 ganged poles 96, 97 and 98. When actuated to the right,
as viewed in FIGURE 8, namely, in the “down” direc
6012 are employed to control the energization of said
tion, said poles are engageable with respective stationary
furnaces. Suitable circuitry, not shown, is provided, con
contacts 99, 100 and 101. When actuated to the left, as
necting the respective furnace windings to a source of
in FIGURE 8, namely, in the “up” direction, said
current through the ‘contacts of the relays 60a and 6%, 60 viewed
poles are engageable with respective stationary contacts
whereby said furnaces will be respectively energized re
102, 103 and 104.
sponsive to the energization of the associated control re
Contacts 99 and 100 are connected by a wire 105 to the
lays 60a and 60b.
contact 89 of limit switch 82. Contacts 101 and 102 are
7 The relays 60a and 6012 may be either manually con
connected by a wire 106 to the line wire 65. Contacts
trolled or may be controlled automatically, in accord 65 103 and 104 are connected by a wire 107 to the contact
ance with the positions of the respective furnaces, namely,
79 of limit switch 77.
in accordance with the condition of the furnace-position
ing mechanism illustrated in FIGURES 1 to 7.
The reversible motor 17 has the respective windings 108
and 109, the winding 108 being employed as the reversing
Thus, respective manually operated, three-position
winding. Thus, one terminal of winding 109 is con
switches 61a and ‘611) are provided, said switches having 70 nected to line wire 65 and the other terminal thereof is
lower contacts 62:: and 62b selectively engageable by
connected to pole 97, so that winding 109 will be energized
the poles of said switches. The lower contacts 62:: and
in the same manner when pole 97 engages either contact
62b. are connected to one line conductor 64.
The switch
100 or 103. The terminals of winding 108 are connected
poles are connected through the respective relay windings
to the respective switch poles 96 and 98, so that the line
to the remaining line conductor 65. Upper contact 63a 75 connections of said winding will be reversed, depending
3,055,206
5
6
.
upon whether the poles of switch 95 are actuated either
ing switch 95 to its “up” position, thus restoring the parts
to the right, or to the left, as viewed in FIGURE 8.
to their positions shown in FIGURES 1 and 8.
FIGURE 8 illustrates the circuit arrangement which
As shown in FIGURE 8, the furnace control relays 60a
exists when the parts are in the positions illustrated in
and 60b are provided with respective indicating pilot lamps
FIGURE 1, namely, when block member 30 is in its
116a and 116b, connected in parallel therewith, to in
elevated position with the test chamber 39 received in
dicate which furnace is in operation.
furnace 37a. Under these conditions, if the switches 61a
While a speci?c embodiment of an apparatus for
and 61b are set in their “automatic” positions, namely,
measuring changes in the weight of samples due to tem
with their poles engaging their upper contacts 63a and
perature changes thereof has been disclosed in the fore
63b, furnace control relay 60a may be energized by clos 10 going description, it will be understood that various modi
ing the control switch 110 of main control relay 68 by a
?cations within the spirit of the invention may occur to
circuit comprising line wire 65, the Winding of relay 60a,
those skilled in the art. Therefore it is intended that no
the pole of switch 61a, contact 63a, wire 66, pole 67a,
limitations be placed on the invention except as de?ned
contact 69a, wire 94, contact 71, pole 73, wire 93, contact
by the scope of the appended claims.
91, pole 90, wire 92, and line wire 64.
What is claimed is:
15
To change furnaces, switch 95 is ?rst operated to the
1. In an apparatus for detecting changes in weight of a
right, as viewed in FIGURE 8, namely, to its “down”
position. This energizes motor winding 109 by a circuit
sample as a function of temperature, a vertical support, a
test chamber adjacent said support, weight responsive
comprising line wire 65, winding 109, pole 97, contact
100, wire 105, contact 89, pole 88, wire 93, contact 91, 20
pole 90, wire 92, and line wire 64. At the same time,
motor winding 108 is energized by a circuit comprising
line wire 65, wire 106, contact 101, pole 98, Winding 108,
pole 96, contact 99, wire 105, contact 89, pole 88, wire
93, contact 91, pole 90, wire 92, and line wire 64.
The motor rotates screw shaft 20 in a direction to lower
means mounted in said test chamber and adapted to re—
ceive a sample, means responsive to said weight-responsive
means for measuring and indicating the weight of said
sample, a test furnace slidably mounted on said support
and guided solely for vertical movement thereon, said
furnace being located 'to receive said test chamber at
25 certain positions of the furnace on said support, whereby
nut member 25, releasing limit switch 72 and causing
the test chamber may be heated and the change in weight
of a sample on said weight~responsive means may be
pole 73 to disengage from contact 71 and engage contact
measured, an electric motor, elevating and lowering means
on the support operatively connected to said test furnace,
prepares a circuit, presently to be described, for ener 30 means drivingly coupling said motor to said elevating and
gizing control relay 60b.
lowering means, an energizing circuit connected to said
Block member 30 descends until limit switch 82 is open
motor, and cooperating means on the furnace and the
ed by the engagement of its operating element 87 with
support constructed and arranged to open said energizing
disc member 23, whereby both motor windings 108 and
circuit responsive to the movement of said test furnace to
109 are disconnected from line wire 64 by the opening of 35 a predetermined position on said support.
limit switch 82.
2. In an apparatus for detecting changes in weight of a
74. This deenergizes the furnace control relay 60a and
Block member 30 may then be manually rotated through
an angle of 180 degrees, during which switch 83 is opened,
as above described by the engagement of element 84 with
the top surface of disc member 23, whereby neither motor 40
winding nor the heater control relay 60a or 60b can be
energized (with switches 61a and 61b remaining set in
their “automatic” positions) during said rotation.
sample as a function of temperature, a vertical support,
a test chamber adjacent said support, weight responsive
means mounted in said test chamber and adapted to re
ceive a sample, means responsive to said weight-respon
sive means for measuring and indicating the weight of
said sample, a test furnace slidably mounted on said sup
port and guided solely for vertical movement thereon, said
When furnace 37b comes into vertical alignment with
furnace being located to receive said test chamber in an
chamber 39, element 84 enters recess 86, allowing switch 45 elevated position of the furnace on said support, whereby
83 to close. Switch 82 remains open.
the test chamber may be heated and the change in weight
Block member 30 may then be elevated by actuating
of a sample on said weight-responsive means may be
switch 95 to the left, as viewed in FIGURE 8, namely,
measured, an electric motor, elevating and lowering means
to its “up” position. This energizes motor winding 109
operatively connected to said test furnace, means drivingly
through a circuit comprising line wire 65, winding 109, 50 coupling said motor to said elevating and lowering means,
pole 97, contact 103, wire 107, contact 79, pole 78, wire
an energizing circuit connected to said motor, and co
80, contact 74, pole 73, wire 93, contact 91, pole 90, wire
operating means on the furnace and the support construct
92 and line wire 64. Motor winding 108 is energized by
ed and arranged to open said energizing circuit responsive
a circuit comprising line wire 65, wire 106, contact 102,
to the downward movement of said test furnace to a posi
pole 96, winding 108, pole 98, contact 104, wire 107, con 55 tion below the bottom end of said test chamber.
tact 79, pole 78, wire 80, contact 74, pole 73, wire 93,
3. In an apparatus for detecting changes in weight of a
contact 91, pole 90, wire 92 and line wire 64.
sample as a function of temperature, a vertical support,
Screw shaft 20 is rotated by the motor in a direction to
a test chamber adjacent said support, weight-responsive
elevate nut member 25, and such rotation continues until
means mounted in said test chamber and adapted to receive
abutment member 81 engages the operating element of
a sample, means responsive to said weight-responsive
limit switch 77, causing pole 78 to disengage from contact 60 means for measuring and indicating the weight of said
79 and engage contact 76. This deenergizes both motor
sample, a test furnace slidably and rotatably mounted on
windings and energizes furnace relay 6012 by a circuit com
said support and guided solely for vertical movement
prising line wire 65, the winding of relay 60b, the pole of
thereon, said furnace being located to receive said test
switch 61b, contact 63b, wire 75, pole 67b, contact 6%,
chamber in an elevated position of the furnace on said
wire 115, contact 76, pole 78, wire 80, contact 74, pole 73, 65 support, whereby the test chamber may be heated and the
wire 93, contact 91, pole 90, wire 92, and line wire 64.
change in weight of a sample on said weight-responsive
Thus, furnace 37b is substituted for furnace 37a, so that
means may be measured, means limiting rotation of said
a succeeding determination can be made without the neces
test furnace while in said elevated position, an electric
sity of waiting until furnace 37a has cooled down.
70 motor, elevating and lowering means operatively con
For a further succeeding determination, furnace 37a
nected to said test furnace, means drivingly coupling said
may be later substituted for furnace 3712 by actuating
motor to said elevating and lowering means, an energiz
switch 95 to the “down” position, manually rotating the
ing circuit connected to said motor, and cooperating means
block member 30 back through an angle of 180 degrees
on the furnace and the support constructed and arranged
when it is in its lowered position, and by then actuat 75 to open said energizing circuit responsive to the lowering
3,055,206
7
of said test furnace to a position below the bottom end
of said test chamber.
7
4. In an apparatus for detecting changes in weight of
a sample as a function of temperature, a vertical support,
a test chamber adjacent said support, weight-responsive
means mounted in said test chamber and adapted to re
ceive a sample, means responsive to said weight-responsive
means for measuring and indicating the weight of said
8
means mounted in said test chamber and adapted to re
ceive a sample, means responsive to said Weight-responsive
means for measuring and indicating the weight of said
sample, a test furnace rotatably and slidably mounted on
said support and guided solely for vertical movement
thereon, said furnace being located to receive said test
chamber when the furnace is elevated in a predetermined
rotated position relative to said support, whereby the test
chamber may be heated and the change in Weight of a
sample on said weight-responsive means may be measured,
an electric motor, elevating and lowering means operatively
connected to said test furnace, means drivingly coupling
sample, a test furnace slidably and rotatably mounted on
said support and guided solely for vertical movement
thereon, said furnace being located to receive said test
chamber in an elevated position of the furnace on said
support, whereby the test chamber may be heated and
said motor to said elevating and lowering means, an
the change in weight of a sample on said Weight-responsive
energizing circuit connected to said motor, means pre
means may be measured, means limiting rotation of said 15 venting closure of said energizing circuit unless said test
test furnace while it is in an elevated position receiving
chamber is in said predetermined rotated position, means
any portion of said test chamber, an electric motor, elevat
limiting rotation of said test furnace when it is elevated
ing and lowering means operatively connected to said
in said predetermined rotated position, and cooperating
test furnace, means drivingly coupling said motor to said
means on the furnace and the support constructed and ar
elevating and lowering means, an energizing circuit con 20 ranged to open said energizing circuit responsive to the
nected to said motor, and cooperating means on the
elevation of said furnace to a predetermined height on
furnace and the support constructed and arranged to open
said support.
said energizing circuit responsive to the lowering of said
8. In an apparatus for detecting changes in Weight of a
test furnace to a position wherein the test furnace no longer
sample as a function of temperature, a vertical support, a
receives any portion of said test chamber.
25 test chamber adjacent said support, weight-responsive
5. In an apparatus for detecting changes in weight of a
means mounted in said test chamber and adapted to receive
sample as a function of temperature, a vertical support, a
a sample, means responsive to said Weight-responsive
test chamber adjacent said support, weight-responsive
means for measuring and indicating the weight of said
means mounted in said test chamber and adapted to re
sample, a test furnace slidably mounted on said support
ceive a sample, means responsive to said weight-respon 30
sive means for measuring and indicating the weight of
said sample, a test furnace rotatably and slidably mounted
on said support and guided solely for vertical movement
thereon, said furnace being located to receive said test
chamber when the furnace is elevated in a predetermined 35
rotated position relative to said support, whereby the test
chamber may be heated and the change in weight of a
sample on said weight-responsive means may be measured,
an electric motor, elevating and lowering means oper-_
atively connected to said test furnace, means drivingly
coupling said motor to said elevating and lowering means,
and guided solely thereby for vertical movement thereon,
said test furnace being movable to a position receiving
said test chamber, whereby the test chamber may be
heated and the change in Weight of a sample on said
weight-responsive means may be measured, a reversible
electric motor, elevating and lowering means on the sup
port operatively connected to said test furnace, means
drivingly coupling said motor to said elevating and lower
ing means, ?rst energizing circuit means connected to said
motor and being constructed and arranged to energize said
motor at times in a direction to lower said test furnace,
cooperating means on the furnace and support constructed
an energizing circuit connected to said motor, means
and arranged to open said first energizing circuit means
closing said energizing circuit when said test furnace is
responsive to the lowering of said furnace to a position
in said predetermined rotated position, and cooperating
below the bottom end of said test chamber, second
means on the furnace and the support constructed and ar 45 energizing circuit means connected to said motor and
ranged to open said energizing circuit responsive to the
being constructed and arranged to energize said motor at
elevation of said furnace in said predetermined rotated
other times in a direction to elevate said test furnace,
position to a predetermined height on said support.
and cooperating means on the furnace and support con
6. In an apparatus for detecting changes in weight of a
structed and arranged to open said second energizing
sample as a function of temperature, a vertical support, a 50 circuit means responsive to the elevation of said furnace
test chamber adjacent said support, weight-responsive
to a predetermined height on said support.
means mounted in said test chamber and adapted to re
9. In an apparatus for detecting changes in weight of a
ceive a sample, means responsive to said weight-responsive
sample as a function of temperature, a vertical support,
means for measuring and indicating the weight of said
a test chamber adjacent said support, weight-responsive
sample, a test furnace rotatably and slidably mounted on 55 means mounted in said test chamber and adapted to re
ceive a sample, means responsive to said weight-responsive
said support and guided solely for vertical movement
thereon, said furnace being located to receive said test
chamber when the furnace is elevated in a predetermined
rotated position relative to said support, whereby the test
chamber may be heated and the change in weight of a
sample on said weight-responsive means may be measured,
an electric motor, elevating and lowering means opera
tively connected to said test furnace, means drivingly
coupling said motor to said elevating and lowering means,
means for measuring and indicating the weight of said
sample, a test furnace slidably mounted on said support
and guided solely thereby for vertical movement thereon,
Weight~responsive means mounted in said test chamber
and adapted to receive a sample, a reversible electric
motor, elevating and lowering means on the support
operatively connected to said test furnace, means drivingly
coupling said motor to said elevating and lowering means
an energizing circuit connected to said motor, means 65 ?rst energizing circuit means connected to said motor and
being constructed and arranged to energize said motor at
closing said energizing circuit when said test furnace is in
times in a direction to lower said test furnace, cooperating
said predetermined rotated position, means limiting rota
means on the furnace and support constructed and ar
tion of said test furnace when it is elevated in said pre
ranged to open said ?rst energizing circuit means respon
determined rotated position, aud cooperating means on the
furnace and the support constructed and arranged to open 70 sive to the lowering of said furnace to a position below the
bottom end of said test chamber, second energizing circuit
said energizing circuit responsive to the elevation of said
furnace to a predetermined height on said support.
7. In an apparatus for detecting changes in weight of a
sample as a function of temperature, a vertical support, a
means comiected to said motor and being constructed and
arranged to energize said motor at other times in adirection
to elevate said test furnace, cooperating means on the
test chamber adjacent said support, weight-responsive 75 furnace and support constructed and arranged to open said
3,055,206
9
10
second energizing circuit means responsive to the elevation
of said furnace to a predetermined height on said support,
and means rendering said last-named means inoperative
and means limiting rotation of said test furnace while it
unless said test furnace is in said predetermined position.
13. In an apparatus ‘for detecting changes in weight of
is in an elevated position receiving any portion of said
a sample as a function of temperature, a vertical support,
test chamber.
a test chamber adjacent said support, weight~responsive
10. In an apparatus for detecting changes in weight
means mounted in said test chamber and adapted to re
of a sample as a function of temperature, a vertical sup
port, a test chamber adjacent said support, weight-respon
ceive a sample, means responsive to said Weight-respon
sive means for measuring and indicating the weight of
sive means mounted in said test chamber and adapted to
receive a sample, means responsive to said Weight—re
sponsive means for measuring and indicating the weight
of said sample, bracket means rotatably and slidably
port and guided solely thereby for vertical movement
said test chamber when the bracket means is elevated on
furnace is in said predetermined position.
said sample, a test furnace slidably mounted on said sup
thereon, said furnace being located to receive said test
chamber when the furnace is at a predetermined position
mounted on said support and guided solely thereby for
on said support, whereby the test chamber may be heated
vertical movement thereon, a pair of test furnaces mount
and the change in Weight of a sample on said weight
ed on said bracket means at the same horizontal distance 15 responsive means may be measured, means to control
from said vertical support as said test chamber and being
the energization of said test furnace, and means render
rotatable with said bracket means to selectively receive
ing said last-named means inoperative unless said test
the support, whereby the test chamber may be heated and
14. In a test apparatus of the character described, a
the change in weight of a sample on said weight-responsive 20 vertical support, a test chamber adjacent said support,
means may be measured, and means limiting rotation of
weight-responsive means mounted in said test chamber
said bracket means while any portion of said test chamber
and adapted to receive a sample, means responsive to
is received in one of the test furnaces.
said weight-responsive means for measuring and indicat
11. In an apparatus for detecting changes in weight of a
ing the weight of said sample, bracket means rotatably
sample as a function of temperature, a vertical support, a 25 and slidably mounted on said support and guided solely
test chamber adjacent said support, weight-responsive
thereby for Vertical movement thereon, and a plurality
means mounted in said test chamber and adapted to receive
of test furnaces mounted on said bracket means at the
a sample, means responsive to said weight-responsive
means for measuring and indicating the weight of said
sample, bracket means rotatably and slidably mounted on
said support and guided solely thereby for vertical move
same horizontal distance from said vertical support as
said test chamber and being rotatable with said bracket
means to selectively receive said test chamber when the
bracket means is elevated on the support, whereby the
test chamber may be heated and the change in weight of
ment thereon, a pair of test furnaces mounted on said
bracket means at the same distance from said vertical sup
port in a horizontal direction as said test chamber and be
a sample on said weight-responsive means may be meas
ing rotatable with said bracket means to selectively receive 35
said test chamber when the bracket means is elevated on
ured.
15. In a test apparatus of the character described, a
vertical support, a test chamber adjacent said support,
bracket means rotatably and slidably mounted on said
support and guided solely thereby for vertical movement
thereon, weight-responsive means mounted in said test
the support, whereby the test chamber may be heated
and the change in weight of a sample on said weight-re
sponsive means may be measured, means to elevate said
bracket means, and means limiting elevation of said 40 chamber and adapted to receive a sample, means respon
bracket means unless one of said test furnaces is disposed
sive to said weight~responsive means for measuring and
below said test chamber substantially in vertically align
indicating the weight of said sample, a plurality of test
ment therewith.
furnaces mounted on said bracket means at the same
12. In an apparatus for detecting changes in Weight of
horizontal distance from said vertical support as said
a sample as a function of temperature, a vertical support, 4:5
test chamber and being rotatable With said bracket means
a test chamber adjacent said support, weight-responsive
to selectively receive said test chamber when the bracket
means is elevated on the support, whereby said test
chamber may be heated and a change in a sample in said
means for measuring and indicating the Weight of said
sample, a test furnace slidably mounted on said support and 50 test chamber may be measured, and means limiting rota
tion of said bracket means while any portion of said test
guided solely for vertical movement thereon, said furnace
means mounted in said test chamber and adapted to re
ceive a sample, means responsive to said weight-responsive
chamber is received in one of the test furnaces.
being located to receive said test chamber at a pre
16. The structure of claim 15, and electrically oper
determined position on said support, whereby the test
ated elevating means drivingly coupled to said bracket
chamber may be heated and the change in weight of a
sample on said Weight-responsive means may be measured, 55 means, and means preventing energization of said elevat~
ing means unless one of said test ‘furnaces is disposed
an electric motor, elevating and lowering means operative
below and in vertical alignment with said test chamber.
ly connected to said test furnace, means driviugly coupling
said motor to said elevating and lowering means, an
References Cited in the ?le of this patent
energizing circuit connected to said motor, cooperating
means on the furnace and support constructed and ar
ranged to open said energizing circuit responsive to the
movement of said test furnace to said predetermined posi
tion, means to control the energization of said test furnace,
UNITED STATES PATENTS
60
1,558,828
2,709,914
Brace _______________ __ Oct. 27, 1925'
Brabender et al. ________ .... June 7, 1955
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