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Патент USA US2121769

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June 21, 1938.
J. STATZ
2,121,769
RAIL BOND
Filed Jan. 21, 1935
lnvenfar: .
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97M
2.121.169
Patented June 21, 1938
UNITED STATES PATENT OFFICE
RAIL BOND
John Statz, Worcester, Mass, assignor to The
American Steel and Wire Company oil New
Jersey, a corporation of New Jersey
Application January 21, 1935, Serial No. 2,820 .
'
3 Claims.
(01. 173-283)
This invention relates in general to terminals,
and particularly to rail bonds of the type having
terminals adapted for connection to railroad rails
in which depressions are formed for this purpose.
5
One of the objects is to provide a rail bond of
the above type that is structurally sound in that
its conductor strand is butt-welded to its termi
nals, yet which may be applied to these rails by
means of these depressions through the medium
10 of conventional devices such as are now used by
railroads for this purpose. Other objects may
be inferred;
'
.
Speci?c examples of rail bonds embodying the
features of the present invention are illustrated
15 by the accompanying drawing, Figures 1 and 2
being side views of these examples ready for ap
plication to the head of a railroad rail in which
a depression is formed.
‘
-
More speci?cally‘, Figure 1 shows a rail bond
20 including the combination of a conductor I and
a steel terminal butt-welded to this conductor I,
the terminal having a head 2 and a cylindrical
steel stud (3 projecting integrally from the head
2 and having a cylindrical end 4 of reduced diam
25 eter arranged concentrically respecting its re
mainder and being integral therewith.
_.
butt-welded to this conductor 5, this terminal
30 having ahead 6 anda cylindrical'steel stud ‘I
projecting integrally from the head 6 and hav
ing a ball-like end 8 of the same lateral diameter
and which integrally connects therewith through
This
neck 9_
‘
35 ?ares smoothly in both directions, as at Ill to
so connect the end 8 with the rest of the stud ‘I,
and is integral with each.
7
Both of the bonds are intended for application
to the head ll of a railroad rail in which a rela
40 ' tively shallow depression I! is formed.
This de
pression may have sides which are roughened
by variously shaped markings. In both instances
the studs are of a length greater than the depth
of this depression 12.
9 which interconnects the two. In either case
the ends are forced against the bottom or end‘ of
the depression I2.
I
f 5
To appreciate one of the biggest features of this
rail bond it must be understood that there are
no practical methods now known for butt-weld
ing a conductor to a copper terminal of a larger
cross-section than the conductor, while it is pos- l0.
sible to butt-weld a conductor to a steel terminal
of larger cross-section than the conductor.
Hence it is desirable to ‘uses. steel terminal in
the 'case of rail bonds, which is natural because
of the structural superiority of a butt-welded con- 15
nection as against a press-fitted or soldered con
nection. However, if a steel terminal is used,
a steel stud must also be used if the terminal is to
be an integral unit.-
V
This brings up the dii?culty of expanding a 20
solid steel stud in a depression in a railroad rail
by means of any conventional apparatus now usu
ally used for rail bond installations. The pres
ent invention provides a rail bond which avoids
this di?lcuity, since it enables the use of ordinary 25 ‘
-
Figure 2 shows a rail bond including the com
bination of a conductor 5 and a steel terminal
a. neck 9 of reduced diameter.
spreading action on the latter, this resulting be
cause of the smoothly ?aring shape of the neck
-
45
To e?fect the installation of these bonds, the‘
stud of whichever one is being used is inserted
in the depression 12 and force is applied to the
' head of the terminal at a point opposite this stud
so as to force the same into the depression 12.
50 In the case of the first described bond the reduced
end 4 pushes up into the cylindrical portion 3 of
‘the stud so as to exert a spreading action on- at
least a portion of the latter. In the case of the
secondly described bond, the ball-like end 8 is
?gforcedtowardstheportion'lsoastoexerta
pressing or hammering apparatus by reason of
the fact that the tendency of the stud to expand
is greatly aided by the ends described.
'
It is to be understood that ends of other
shapes may also function in the manner de- 30
scribed. Therefore, the invention is not to be
limited exactly to the two shapes disclosed, ex
cept as de?ned by the following claims.
I claim:
'
1. The combination of a railroad rail having a 35
substantially cylindrically walled depression with
a'bottom formed therein, and a rail-bond stud
terminal having a ‘substantially cylindrically sided
solid stud insertable in said depression, ‘said stud
integrally having an end for contacting- said 40
bottom when said stud is inserted in said depres
sion and a neck interconnecting said stud and
said end, said neck being of less diameter than
said stud and subst ntially concentric therewith,
said neck being free from said bottom when said 45
end contacts the same.
2. The combination of a railroad rail having a
substantially cylindrically walled depression with
a bottom formed therein, and a rail bond stud
terminal having a substantially cylindrically sided 50
solid stud insertable in said depression, said stud
integrally having an end for contacting said bot
tom when said stud is inserted in said depression
and a‘neck interconnecting said stud and said
end, said neck being of less diameter than said 55
2
2,121,709
, stud and substantially concentric therewith, said
’
.
110mm when said stud is inserted in said de
pression and a neck interconnecting said stud and
said end, said neclr being 01.’ less diameter than
said stud vand substantially concentric therewith.
drical.
3. The combination of a railroad rail having-“an
,
said neck being free from said botton when said
substantially
a bottom formed
cylindrically
therein, walled
and a depression
rail bond stud end contacts the same, said end being ball-shaped
and of substantially the same diameter as that of
terminal having a substantially cylindrically sided said stud, and said neck ?aring smoothly at its
solid stud insertable in said depression, said stud junctions with said stud and said end.
10 integrally having an end for contacting said
JOHN STATZ. 10
neck being free from said bottom when said end
contacts the same and being substantiallyrcylin
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