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Патент USA US2124411

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July 19, 1938.
‘
.
|__ _,|_ DE LANTY
2,124,411,
FLAW DETECTOR MECHANISM
Filed Nov. 17, 1933
Zinventor
LOPEN .1 DE AAA/TY,
Wig"?
'
2,124,411
Patented July 19, 1938,
0
PATENT OFFICE:
UNITED STATES
2,124,411
7
v
FLAW DETECTOR-MECHANISM
Loren J. De Lanty, Spring Valley, N. Y., assignor
to Sperry Products, Inc., Brooklyn, N. Y., a '
corporation of New York
Application November 1'7, 1933, Serial No. 698,522
10 Claims.
(Cl. 172-311)
, anism for electrical conductors, and, more partic
portion of the rail through means ‘such as sets"
ularly, to.Sperry rail ?aw detector cars. These
cars employ a mechanism consisting of a gen
5 erator for supplying current to the rail to estab
lish an electromagnetic ?eld surrounding the
of spaced brushes II and I2 for establishing an
electromagnetic ?eld surrounding the rail R. 5
Said brushes may be mounted on a current brush
carriage l5 which is normally held in elevated
same and then causing induction means to ex
plore the said ?eld in constant relation to the
rail so that any variations in ?ux in- the ?eld
position by means such as retractile springs (not
shown) and cables l8. When it is desired to
lower the éarriage to e?ective position in engage- 10
10 caused by the presence of ?aws will result in in
ducing an E. M. F. which, after being suitably
ampli?ed, may be caused to operate an indicator,
ment with the rail, this may be done either by a ,
suitable leverage connection \or by means of a
compressed ?uid supplied to cylinders I9 to lower
such as a recorder. At the same time that the
piston rods 20 which'are connected to the car
riage. Said carriage may ride upon the rail on 15
recorder is actuated, there is operated another in
lli dicator, in the form of a paint gun for spraying
?anged wheels 2|.
' paint on the rail at the-point where a ?ssure is
detected.
.
">
\
1
,
There'is provided means for detecting any vari
ations in the electromagnetic ?eld caused by the
'
It has beenfoundthat at times the pens op
erating on the recording‘ ch'art were operated to
20 di?erent degrees, depending upon the duration of
v . the impulse transmitted by the ampli?er.
'
portion of ‘which is shown, within which is
mounted a generator G for supplying current to a
This invention relates to ?aw detector mech
presence of ?aws in the rail. Said means com
prises a pair of induction coils 23 vmounted within 20
the‘ housing 24 supported on a detector carriage
25 which. may be mounted on the current brush
The
pens, which normally trace a straight line on‘the
moving chart, are actuated by the output of the
ampli?er tocause a jog in the line, and these
25- jogs were found at times to be very small and
carriage I5 for movement independent thereof by
means such as loose-'é?tting bolts 26 and springs
21. Said detector carriage may‘ be caused to en- 25
gage the rail by any suitable means, such as
, at other times to be of substantial length. It is
the principal objectof my invention to provide
rollers 28.
'
»
I
' As the car moves along the rails the induction
means which will insure a constant degree of
coils 23 will normally cut’ a constant numberioi
operation of the pens when there is an impulse
30 from the ampli?er, regardless of the duration-of , lines of force. Any variations in the current sup- 30
ply will have no e?ect upon’ the coils 23 because
said impulse.
said coils are of equal inductance and oppositely
At the same time that the output of the ampli
?er operates the recording mechanism described connected so that such variation in the electro—
above, it also operates the paint gun through magnetic ?eld caused by variations in current
as means such as a relay. This operation also was supply will affect said coils equally, oppositely, 35
found to be variable so that at times a long paint and simultaneously. The same'is true when the
mark was obtained and at times only a small housing 24 moves with respect to the rail R to '
paint mark was obtained. It is, therefore, a change the spacing between the two. When,.
further object of my invention to provide means however, a region of ?aw is encountered, ?rst one
40 which willinsure a‘ constant degree of operation and then the other of said coils will cut a di?er- 40'
of the paint gun regardless of the size of the cut number of lines of force which will induce a
output from the ampli?er.
‘
Further objects [and advantages will become
ll
‘
differential E. M. R, which,» after being suitably
ampli?ed by the ampli?er A, may be caused to
apparent from the following detailed description
operate an indicating mechanism vsuch as pen
magnet 29 operating pen P on a chart C. _ The 45'
thereof.
output of- the ampli?er A may also operate a
paint gun 40 as by means of a paint gun magnet
.
_
w
,
.
In the accompanying drawing,
Fig. 1 is a side elevation of a portion of a Sperry
rail ?aw detector. car to which my invention is
30 controlling a valve 3|.
.
In order to insure a constant degree of actua
50
Fig. 2 is a view largely diagrammatic, illustrat- ' tion ‘of pen P as well as the paint gun 40; I may 50
cause the ampli?er A to act upon an independent
ing the principle underlying my invention.
’ adapted to be applied.
The ?aw detector mechanism, which I have
shown employed in the Sperry rail ?aw detector
car, is mounted on a rail car adapted totravel
along the rails and comprises a car body In, a
circuit in which there is positioned a condenser
of large capacity designed to be normally charged,
but which the ampli?er causes to discharge
through the pen and paint gun relays when an 55
2
2,124,411
impulse of a duration in excess of a predeter
mined minimum is passed through the ampli?er.
For this purpose I have provided a condenser 32
of large capacity in circuit with battery B. This
circuit extends through an armature 33 and a
contact 34 and said circuit is normally closed by
means such as spring 35. The battery B normally
charges the condenser 32. When an impulse is
sent through ampli?er A due to the differential
10 E. M. F. being induced by coils 23, the output of
ampli?er A is caused to actuate the armature 33
of a relay 34’ against the action of restraining
spring 35 to cause the armature 33 to make
contact at 36, thus breaking the charging circuit
from battery B to condenser 32 and connecting
said condenser to the magnets 29 and 30. There
is thus formed a discharge circuit so that the con
denser may discharge the accumulated charge
thereon in every case where the duration of the
20 impulse from the ampli?er is in excess of a prede
termined minimum. Since the capacitance and
dielectric resistance of the condenser are constant
it will take a de?nite charge each time that the
circuit is closed through the condenser 32 and
battery B and thus a de?nite and constant total
output of energy is obtained every time the con
denser discharges. The characteristic of the con
denser is also such as to permit quick charging so
that no appreciable time interval is necessary to
30 place a full charge upon the condenser 32. Suit
able small condensers 31 and 38 and resistors 4|,
~ 42 may be connected in parallel with the contacts
34, 33 and 33, 36, respectively, to prevent sparking
at the discharge.
If desired, instead of connecting the two mag
dicating means places uniform marks of prede-'
termined size upon said conductor in the region
of ?aws, said last-named means comprising an
electrical operating mechanism for said indicat
ing means comprising means for storing a con
stant quantity of electrical energy when inef
fective to operate said indicating means, means
for discharging the same in a single output when
rendered elfective, and means whereby said re
sponsive means renders said mechanism e?ective
once in response to each ?aw.
3. In a flaw detector for electrical conductors
which normally comprises ?aw responsive means,
indicating means, and means whereby said in
dicating means places uniform marks of prede-'
termined size upon said conductor in the region
of ?aws, said last-named means comprising an
electrical operating mechanism for said indi
cating means comprising means including a con
denser and a'source of electrical energy for stor
ing a constant quantity of energy when inef
fective to operate said indicating means, means
for discharging the same in a single output
when rendered effective, and means whereby said
responsive means renders said mechanism ef
fective once in response to each ?aw.
_
4. In a ?aw detector for electrical conductors
which normally comprises flaw responsive means,
marking means, said ?aw responsive means be
ing adapted to generate impulses of varying du
ration in response to ?aw and means whereby
said impulses actuate said marking means, means
for obtaining uniform marks of predetermined
size upon said conductor adjacent the ?aws, said
nets 29 and 30 in series, they may be independ
last-named means comprising means for limiting
ent, and a separate condenser circuit similar to
that shown may be provided for each magnet.
said actuation to a single output of constant de
gree irrespective of the duration of said impulses
in excess of a predetermined minimum dura
Also, instead of one relay 34 being provided for
40 actuating the armature 33, separate relays with
separate armatures may be provided for the sep
arate condenser circuits to the pen magnet 29
and the paint gun magnet 30, respectively.
In accordance with the provisions of the pat
ent statutes, I have herein described the prin
ciple and operation of my invention, together
tion.
‘
5. In a ?aw detector for electrical conductors
which normally comprises ?aw responsive means,
indicating means, and means whereby said in
dicating means places uniform marks of pre
determined size upon said conductor in the re
gion of ?aws, said last-named-means compris
with the apparatus which I now consider to rep
ing an operating mechanism 'for said indicat
resent the best embodiment thereof, but I de
sire to have it understood that the apparatus
shown is only illustrativeand that the inven
ing _ means, said mechanism including a con
tion can be carried out by other means. Also,
while it is designed to use the various features
and elements in the combinaion and relations
described, some of these may be altered and oth4
ers omitted without interfering with the more
general results outlined, and the invention ex
tends to such use.
Having described my invention, what I claim
and desire to secure by Letters Patent is:
1. In a ?aw detector for electrical conductors
‘ which normally comprises ?aw responsive means,
indicating means, and means whereby said in
60
dicating means places uniform marks of prede
termined size upon said conductor in the region
65 of flaws, said last-named means comprising an
electrical operating mechanism for said indicat
ing means comprising means for storing a con
stant‘ quantity of electrical energy when inef
fective to operate said indicating means and dis
70 chargingfthe same in a single output when ren
dered e?ective, and means whereby said respon- .
sive means renders said mechanism effective once
in response to each ?aw.
‘
~ 2. In‘ a ?aw detector for electrical conductors
-l Cl
indicating means, and means whereby said in- ,
which normally comprises ?aw responsive means,
denser, ‘a source of energy, means whereby said
source normally charges ‘said condenser, means
for discharging said condenser in a single out
put, means whereby said indicator is actuated
when said condenser discharges, and means
whereby said responsive means discharges said
discharge means once in response to each ?aw.
6. In a ?aw detector for electrical conductors
which normally comprises/?aw responsive means,
indicating means, and means whereby said in
dicating means places uniform marks of prede
termined size upon said conductor in the region
of ?aws, said last-named means comprising an
operating mechanism for said indicating means,
said mechanism comprising an electric circuit,
said circuit including a condenser, means for
charging the condenser, and means for discharg
ing the condenser in a single output, and means
whereby said responsive means discharges said
discharge means once in response to'each'flaw. '
7. In a ?aw detector for electrical'iconductors ‘
which normally comprises ?aw responsive means, 79.
indicating means, ‘ and ‘means whereby‘ said ‘ in
dicating means places uniform marks ‘of prede
termined size upon said conductor in th'é're'gion
of flaws, said last-named means comprising an
operating mechanism for said indicating means, 75
2,124,411‘
‘
3
said mechanism comprising an electric circuit, adjacent the ?aw and means whereby ‘said ?aw
‘said circuit including 'a condenser, means for responsive means actuates said marking means,
charging the condenser, means for discharging means for limiting to, a constant predetermined.
size the mark placed upon the rail, said last
the condenser in a single output, means where
by each of said'charging means and discharging named means including an electric circuit hav
means is rendered eifective and ineffective when ing a condenser of predetermined capacity, means
the other is rendered ineiiective and effective,
respectively, and means whereby said responsive
means discharges said discharge means once in
response to each ?aw. ,
-
~ 8. In a ?aw detector for electrical conductors
which normally comprises ?aw responsive means,
indicating means, and means whereby said indi
' eating means places_uniform- marks of prede
whereby said circuit controls the energizatlon
of said marking means, and means whereby the -
impulse from said responsive means controls said
circuit to render'the' same e?ective to operate 10
said marking means once in response to each
?aw.
.
_
.
- 10. In a rail ?aw detector mechanism which
normally comprises means whereby said ?aw »
of ?aws, said last-named means comprising an
responsive means generates impulses of variable
duration in response to ?aw, marking means for
' means whereby each of said charging means and
cluding an electric circuit having a condenser
termined size upon said conductor in the region
operating mechanism for said indicating means, ‘ placing, a mark on the rail ‘adjacent the ?aw
said mechanism comprising an electric circuit, and means whereby said ?aw responsive means
actuates said marking means, means for limit
said circuit including a condenser, means nor
mally e?ective for charging the condenser,.means ' ing to a constant predetermined size the mark
for discharging the condenser in a single output, placed'upon the rail, said last-named means in
discharging means is'rendered e?ective and in—
of predetermined capacity, means for normally
eil’ective when the other is rendered ineffective
and e?ective, respectively, and means whereby
charging said condenser, means normally inef- '
fective whereby the output of said condenser con
said responsive means renders said charging trols the energization of said marking means,
means ineffective and said discharge means ef ‘and means whereby‘ the impulse from said re
sponsive means renders said charging means in
fective once in response to each ?aw. ,
9. In a rail flaw detector mechanism which effective and renders said condenser e?ective to
normally comprises ?aw responsive means, means energize said'marking means to operate the same
'
whereby said ?aw responsive means generates once in response to each ?aw.
impulses of variable duration in response to ?aw,
LORENJ. DE LANTY.’ I’
marking means for placing. a mark on the rail
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