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Патент USA US2405076

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J. P. VOLLRATH
¿405,7
THERMOCOUPLE
Filed May 30, 1944
du
INVENTOR.
JOSEPH P. VOLLRATH
Patented July 30, 1946
UNHTED
2,405,076
-f _TNT
STATS
Yorgie-E
2,405,076 t
rHERMocoUPLE
Joseph P. Vollrath, Glenside, Pa.,- assigner to The
Brown Instrument Company, Philadelphia,
Pa., a corporation of Pennsylvania
Application May s0, 1944,’s`eria1No. 538,079 f `
9 Claims.
1
(crise-4)
2
.
The present invention relatesb tov thermocou
Figure 4 is a view showing the end of the ther
ples and more particularly to a contact thermo
couple for use in measuring the sub-surface tem
perature 0f a hot metal object.
In many metal working processes the metal
must be heated before it can be worked upon, and
ure 1.
the working temperature is critical. It becomes
pair of pointed thermocouple wires I and 2 made
mocouple head and
Figure 5 is a view taken on line 5-5 of Fig
The thermocouple head unit is shown in Fig
ures 1 and 4.
Extending from the head are a
necessary therefore to have some means to meas
out of material such as Chromel and Alumel or a
ure quickly the temperature of a billet as it leaves
similar material that is suitable for the range of
a heating furnace and before it is worked upon. 10 temperature for which the thermocouple is to
The measuring process is complicated by the fact
be used. These Wires are held in place in a pair
that the billets as they are heated‘often become
of metal plugs 3 and 4, that are in turn received
coated with a thin oxide film that must be> punc
in openings in a ceramic supporting member 5.
tured` before a reading can be obtained.
'I‘he metal plugs are held in place in the ceramic
It is an object of the present invention to pro
supporting member by means of screws 6 that
vide a thermocouple that may be used to obtain
extend through openings in the member 5 and
a measurement of the temperature of a billet or
are threaded into the plug members 3 and 4 and
other metal object. It is a further object of
into engagement with the thermocouple wires
the invention to provide a thermocouple which
in these members to hold the thermocouple wires
will easily penetrate an oxide ñlm that forms 0n 20 in place. The ceramic member is held and pro
the surface of a hot billet in order for the thermo
tected by a cup-shaped member 'I that has in
couple wires to make a good contact with the
it a thin lining of asbestos II to give a slightly
metal. This is accomplished by providing a ham
cushioned effect between the parts 5 and l. Clips
mer device that automatically acts on the ther
8 are attached to the cup-shaped member ‘I
mocouple to force it into the surface of the billet 25 by means of screws 9 and extend over the edge
when it has been moved against the same by an
of the ceramic member to hold it in place.
operator.
The supporting member 5 is provided, as best
It is another object of the invention to provide
shown in Figure 4, with a reentrant portion I2
a contact type thermocouple which has built into
in which thermocouple extension wires I3 and
it a means for forcing the thermocouple wires 30 I4 are received. These wires extend out of the
into a hot billet whose temperature is being
back of the cup-shaped member ‘I and are brought
measured. This construction insures a good elec
upwardly and bent over into grooves I5 and IE
trical contact between the thermocouple wires
of the plug members 3 and 4 respectively and
and the billet. The construction also provides
are held in these grooves by means of screws
a means to imbed the thermocouple wires in the
Il, as best shown in Figure 1 of the drawing.A
billet so that a reading of the subsurface temper
The thermocouple head unit is mounted on a
ature may be obtained.
The various features of novelty which char
supporting rod I8 and the mounting permits a
small angular movement between the two. To
acterize my invention are pointed out with par
this end a clevis I9 is attached to the back of
ticularity in the claims annexed to and forming a 40 the part 'I and receives in it a tongue 2l on the
end of the rod I8. A pivot pin 22 extends
part of this specification. For a better under
through the clevis and the tongue to hold these
standing cf the invention, however, its advan
parts together. The rod I8 is slidably mounted
tages, and specific objects attained by its use, ref
in a housing which has in it provisions to strike a
erence should be had to the accompanying draw
blow on the end of the rod so that the pointed
ing and descriptive matter in which I have illus
ends
of the thermocouple wires may be forced
trated and described preferred embodiments of
into some object whose temperature is to bemeas
the invention.
ured. The housing in this case consists of two
In the drawing:
tubes 23 and 24 that are joined together as best
Figure 1 is a sectional view of the thermo 50 shown in Figure 1 of the drawing. The rod I 8
couple,
Y
_is guided for movement in these tubes on one
Figure 2 is a view showing the parts in a dif
end by a bearing and stop member 25 that is
ferent position,
held in place at the junction between the tubes,
Figure 3 is a view showing the parts in a_ still
different position,
and on the other end by a disc 26 that is fastened
' 55 to the rod and which slides within the tube 23.
eficaces
4
ment continues until the` end of the rod engages
the shoulder 360i the latch member, at Which
time the impact member and the latch will also
begin to move to the right> relative to the housing.
The parts at this time will be at the position
shown in Figure 2 of the drawing. Continued
movement of the housing and handle to the left
A cap 21 is attached to the left end of the tube
23 to limit the movement of the rod I8 to the
right. The rod is resiliently biased at all times
to the position shown in which disc 26 abuts cap
21 by a spring 28 that bears with one end against
the disc 26 and with the other end against mem
ber 25. vIt is noted that the rod I8 is formed
will cause the latch member and the impact mem
ber to be moved to th'e right relative to the tube
with a iiat portion on its upper side where it ex
tends through the cap 21. This is for the purpose
of preventing rotation of the rod with respect
24 to bring the edge 4I of the latch member into
Vengagement with the cooperating edge of the
sleeve 35. Such engagement will force the latch
will always be held in the same position relative
member downwardly in each of the Figures 1, 2
to the housing. Also fastened between the tube `
and 3 until it reaches the position shown in Fig
members 23 and 24 is a radiation shield 29-that
has an opening 3l in it through which the ther-_` `ure 3 at which' time the bore 34 of the impact
Vmember is clear of any obstruction. Spring 42
mocouple lead wires I3 and I4 extend. These
wires are held in position against the disc 29 by Y .g çwill therefore'quickly and violently move the im
pact ,member to the left so that it will deliver a
means of a clip 32.
The hammer or impact member which 'serves' 'blow to the end of the rod I8 and thereby force
the points of the thermocouple wires into the
to give a driving blow to the thermocouple head
object Whose temperature is1-to be measured.
and which has 'been mentioned above, is located
This blow is sufñcient to drive the points into th'e
within the tubular member 24 -orthehousing
object'to such an extent thata good electrical
This hammer or impact member i-s shown at 33
Contact may be obtained and drive them into the
and consists of a cylindrical metal member hav
ing init a bore 34 that receives the right end of 25 .object deep enough to go through any' oxide ñlm
Whichmay be formed on the surface of Vthe ob
the rod- I8. This impact member has two diam
ject, if it is metal. The measurement then ob
eters, the larger being on its'left end and of a
tainedby th'e thermocouple will be a measure of
diameter equal tothe internal diameter of the
the sub-surface temperature of the object..
tube- member 24. ' The right end of the impact
member is slightly smaller in diameter and is 30 .. From the .above description it will be seen that
I have Yprovided la thermocoupleV assembly in
guided in its movement by a short sleeve 35 which
which a continued movement of a'thermocouple
is> received inthe end of the tube 24. The im
toward the object' whose temperature is to be
pact member 33 has an opening 36 extending
measured will .cause a blow to be delivered to the
transversely of it and midway between its ends.
Received in this opening is a latch member 31 35 thermocouple to -drive the thermocouple head t0
wardthís object and thereby giving a good elec
that is -biased Yupwardly as shown in Figure 1 by
trical'contact so that an accurate reading maybe
means Oi'a spring 36 that is carried by the ham
to the housing so that the thermocouple head " '
mer.
The latch member is formed with a shoul
obtained. rBy pivoting the vthermocouple head
to'the supporting rod it is'not necessary for the
the impact member and which is in the path of 40 operator; to line up the thermocouple exactly per
der `l’yäthat' obstructs the central opening 34 of
movement of rod IB. The latch is also provided
with an inclined surface 4I which is` adapted to
cooperate with» an oppositely inclined surface
.pendicular to the object. The slight ñoscillation
that is >permitted between the thermocouple head
’
and therest .of thestructure will take care of any
slight irregularities'inv the object or in aslightly
The ¿impact »member is normally biased by a - ' improper alignment .of the same. ¿The-thermo
couple assembly can be, madeof any- suitable
spring 42 to the position shown in Figure 1 in
length to permit the operator to stand away from
which'its left end engages one face of the member '
the object sothat he will not be burned while a
25. VThis spring isi-received in a tube 43 that is
temperature;.measurementis being taken. The
attached to and extends to the right beyond the
radiationishieldlß also serves to protect the op
end of the tube 24. The outer'end of the tube 43 formed on the left end of the sleeve 35.
is closedby disc/44 that is attached‘thereto. ~ A
wooden handle 46, by which-the assembly can be
carried, is telescoped over the tube 43 and is held
in position onV this tube by aV screw '41 that is
threaded into'the disc 44. lIt is noted that this
screwi's oiî center with respect-to both the handle
andthe disc 44. The purpose 0f this is to pre
vent rotation of the handle 46 with respect to the
tube
43.
`
_
Y
erator during >the time that, he is using the in
strument,
,
.
,.
'
,
‘
~
'
_ AWhile in accordance with the provisions of th'e
statutes, I haveillustrated and described the bestV
form of this invention now known to me, it would
be Vapparent to those skilled in the` art that '
changes may be made in the forni of the appara
tus disclosed without departingfrom the spirit
of this 4invention as set forth' in the appended
In operation the operator grasps the handle 46 60 claims, and that in some cases certain features
of'rgthis invention may sometimes be used to ad
and presses the thermocouple wires I land 2
vantage> without a corresponding use of other
against the side of an object whose temperature
is to be measured. At this time th'e parts vare
j Havingv now described this inventionI what vI
in the normal position shown in Figure 1 with the
rod I8 Vpressed to the leftby spring 28 so that 65 claim‘a's new and desire to secure by Letters Pat
ent'is:fí`ï"‘
f
Ä'
U'
the disc 26 is inv engagement with the cap 21,
and the impact imember 33 has its left end in
1. A’thermocouple'assembly comprising a pair
engagement with the rdisc125; In orderv to get a
of_ thermocouple wires, supporting means-for said
good electrical contactbetweenthe object wh’ose
wires tohold them in a parallel extended position,
temperature is to be measured and the thermo 70 and 'automatic means to apply a blow to s'aidîs'lip-`
couple wires, the operator forces theentire as
porting means when said thermocouple wiresfare
sembly to the left in Figure 1. Y-AsA this occurs the
moved with a- predetermined pressure" into Ven
spring -28 will be compressed by the disc 26 and
gagement with an object whose ltempera-ture,is
features.'
the' right en'd of rod I8 will slide through'theb‘ore
34. of the impactmember 33. ' -1 This relative move-f`
.
"
Y
to be measured to-force saidthermocouple lwires
i'
75 into engagement with the object.V '
2,405,076
5
2. A thermocouple assembly comprising a pair
of thermocouple wires, supporting means for said
wires, means to deliver a blow to said supporting
6
means, means to prevent said impact means from
delivering said blow, and means operative upon
movement of said impact means to a predeter
means to force said thermocouple wires toward
mined position in said holder to render said pre
an object against which they are placed, force
venting means inoperative.
supplying means to operate said blow delivering
7. A thermocouple assembly comprising a pair
means, and means to release said force applying
of thermocouple wires, supporting means to hold
means operated by pressing said thermocouple
said wires in operative position, a holder in which
wires with a predetermined pressure against an
said supporting means is slidably mounted, means
10 to bias said supporting means to a given position
object whose temperature is to be measured.
3. A thermocouple assembly comprising a pair
in said holder, an impact member slidably mount
of thermocouple wires, a support to hold said
ed in said holder concentric with said supporting
wires in operative position, a rod, means to piv
means, means to force said impact means toward
otally mount said support on said rod, a holder,
said supporting means, means operated by said
means to slidably mount said rod in said holder
supporting means as the latter is moved from its
whereby said rod may be moved to various posi
given position in said holder to move said impact
tionsVVV therein as said thermocouple Wires are
means in said holder against the force of said
pressed against an object whose temperature is
forcing means, and means to render said oper
ated means inoperative when said supporting
to be measured, and means carried by said holder
to deliver a blow to said rod in a direction to force 20 means and impact means reach a predetermined
said thermocouple wires toward an object against
which they have been placed when said rod and
relative position in said holder.
8. A thermocouple assembly comprising a pair
holder reach a given relative position.
of thermocouple wires, supporting means to hold
4. A thermocouple assembly comprising a pair
said wires in operative position, a holder in which
of thermocouple wires, supporting means upon 25 said supporting means is slidably mounted, means
which said thermocouple wires are mounted, a
holder, means to slidably mount said supporting
means in said holder whereby when said thermo
couple wires are placed against an object whose
to bias normally said supporting means to a ñrst
given position in said holder, an impact member
slidably mounted in said holder, means to bias
said impact member toward said supporting
temperature is to be measured said holder may 30 means whereby said impact means may deliver a
be moved along said supporting means, and
blow to said supporting means, latch means mov
means carried by said holder to deliver a blow to
able with said impact means and engageable by
said supporting means to force said thermocouple
Wires toward the object when said supporting
said supporting means to maintain said impact
means away from said supporting means, and
means and holder reach a predetermined relative 35 means to release said latch means upon move
ment of said supporting means and impact means
position.
5. A thermocouple assembly comprising a pair
of thermocouple wires, a support to hold said
to a predetermined position in said holder.
9. A thermocouple assembly comprising a pair
of thermocouple wires, supporting means to hold
wires, a rod, means to mount said support on said
rod, a holder to slidably receive said rod, means 40 said wires in operative position, a holder in which
said supporting means is slidably mounted, means
carried by said holder to deliver a blow to the end
to bias normally said supporting means to a given
of said rod to force said thermocouple wires to
position in said holder whereby when said
ward an object against which they are pressed,
thermocouple wires are placed against an object
and means to operate said last mentioned means
operated upon movement of said rod to a prede 45 whose temperature is to be measured said holder
termined position in said holder.
may be moved relative to said supporting means
6. A thermocouple assembly comprising a pair
in a direction toward said object, and means car
of thermocouple wires, a support to hold said
ried by said holder to deliver a blow to said sup
wires in operative position, a rod upon which said
porting means in a direction to force said thermo
support is mounted, a holder, means to slidably 50 couple wires toward the object when said holder
and supporting means reach a predetermined
mount said rod in said holder, means normally
relative position.
operating to bias said rod to a given position in
said holder, impact means in said holder to deliver
JOSEPH P. VOLLRATH.
a blow to said rod, means to operate said impact
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