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Патент USA US2068528

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Jan. 19, 1937.
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c. R. ANDERSON
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ADJUSTABLE GROUND RAIL CONNEGTER
2,063,523
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Filed Oct.‘ 15, 1935 ‘ ‘
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INVENTOR
2,068,528
Patented Jan. 19, 1937
UNITED STATES PATENT OFFICE
2,068,528
ADJUSTABLE GROUND RAIL CONNECTER
Cecil It. Anderson, Ben Avon, Pa, assignor to
The Martin-Hardsocg Company, Pittsburgh,
Pa., a corporation of Pennsylvania
Application October 15, 1935, Serial No. 45,095
8 Claims.
(Cl. 173-273)
This invention pertains to electrical connecters
and, more particularly, to an electrical connecter
for use in making a connection to a rail for the
ground side of a circuit.
Connecters of the type to which the present
5
invention relates are largely used in mines where
certain parts of the main track system are elec
tri?ed, but where the tracks immediately ad
jacent the working faces of the rooms are not
10'
electri?ed. The mining machines, which are
mobile, are electrically driven. They are pro
vided with an electric cable. One wire in this
cable is provided with a connecter adapted to en
gage the trolley side of the electri?ed track cir
' cuit and the other wire of the cable is clamped
to one of the rails of the electri?ed track circuit.
Figure 4 is a perspective view of the slide mem
ber in which the movable contact jaw is mounted;
Figure 5 represents a transverse section in the‘
plane of line V—-V of Figure 1; and
Figure 6 is a view partly in elevation and partly
in section of a modi?ed arrangement.
Referring to the drawing, 2 designates a body
member of conducting material, preferably cop
per, this body member being in the form of an
elongated bar having a fixed claw 3 at its outer 10
end. The claw member 3 is bent over at an
acute angle so as to provide a tapering space be
tween the underside of the claw on the top of
the body 2 to receive one ?ange of a rail, as
clearly shown in Figure 1. In Figure 1, the out 15
line of a rail is indicated in dotted lines, and
tion to the rail have been such that good con
the manner in which the sloping ?ange of the
rail is engaged under the claw 3 is clearly indi
tact with the rails is not at all times secured,
cated.
Heretofore clamps provided for making connec
, resulting in the irregular operation ofthe min
ing machine and unnecessary heating of the mo
tors. Moreover, the use of such clamps as have
heretofore been provided has been attended with
considerable inconvenience. Clamps of this type
are also used in other places where one side of
a circuit has to be connected to a rail of an
electric track system, the use not being con?ned
entirely to mines and mining machinery.
According to the present invention, there is
provided an adjustable clamping connecter of
simple construction which can be easily operated
Mounted on the bar or body 2 and slidable 20
therealong is a slide member 4, this member hav
ing an undercut guideway 5 therein to receive and
engage the bar 2 and having upstanding side
?anges 6. This slide member has a forwardly
projecting extension or lip portion 1.
: 25
Pivotally supported between side member 6 of
the slide is a jaw member 8 having a forwardly
extending rail ?ange engaging portion 8a and
having a rearwardly projecting lip portion 9. It
will be noted that the under surface of the jaw 30
and which is adaptable for rails over a wide range
portion 8a is tapered. This taper allows the jaw
to accommodate itself to rails of different sizes,
of sizes.
running from 25-110. to 50-lb. rails and even
The invention contemplates the pro
vision of a body member having a claw for en
gagement with one ?ange of a rail and having
a slide member movable therealong having a
rail-clamping element supported therein with
an actuating means _for the rail-clamping ele
ment, the arrangement being such that when one
?ange of the rail is engaged by the ?xed claw,
the slide member may be moved toward the other
?ange, and when engaged with the other ?ange
moved into clamping engagement therewith and
at the same time the sliding member be clamped
against free movement along the body on which
it is carried.
I
The invention may be readily understood by
reference to the accompanying drawing, in which
Figure 1 represents a side elevation of a
grounding clamp connecter embodying my in
vention;
Figure 2 is a top plan view of the connecter
shown in Figure 1;
Figure 3 is a perspective view of the movable
55 contact jaw;
'
heavier. It is, of course, important that there
be good contact with the rail over a relatively
large surface whether the rail be a small rail
or a large one. The pivoted jaw member 8 also
has a rearwardly extending lug IE1 spaced below
the rearwardly projecting extension 9. A pin ll
serves to provide the pivotal support for the 40
member 8. The jaw member has a slightly
curved bottom surface to which may, but which
does not necessarily, rest on the top of the bar 2.
Pivotally supported in the slide member to the
rear of the jaw 8 is an actuating member desig 45
nated generally as l2. This actuating member
has a cam portion [3 which engages under the lip
or extension 9 on the jaw, and has a nose portion
I4 positioned over the lug ill. The member I2
is provided with an operating handle l5 having 50
an insulating sleeve 15 thereon. The member I2
is pivotally supportedvby means of a pin [1.
Bolted to the bar 2 is a lateral extension or
connecter member it! having a clamp I9 thereon
with a bolt 20 for adjusting the clamp, this clamp 55
2
2,068,528
a pin 3| between side members 26 is the operat
ing member designated generally as 32 and hav
ing an insulated handle 33. The operating
member has a forwardly extending portion 34
with gear teeth 35 arranged to cooperate with
the gear teeth 30. When the handle 33 is pressed
being for engaging the terminal of the cable 2|
leading to the mining machine or other machine
to be connected with the rail. The bar 2 has a
rearwardly extending portion back of the connec
ter designated 22, the extension 22 being covered
with an insulating sleeve 23.
This forms a han
It will be noted that the portion 8a. of the jaw
down, the motion transmitted through the gear
teeth to the jaw member 2‘! is such as to cause
is of a width greater than the width between the
the lip 21a to be forced down against the ?ange
10 two upstanding ?anges 6-6 so as to afford an
of the rail, whereas movement of the handle in
the opposite direction causes the jaw member
to be lifted out of engagement with the ?ange
of the rail. It will be seen in this arrangement
as in the arrangement previously described, that
the motion of the handle is positively transmitted
to the clamping element and that the clamping
element acts directly against the ?ange of the
rail, no local pressure being exerted at any point
against the body 24. In either of the forms of
die for the connecter unit.
increased area of contact with the rail ?ange.
It will also be noted that this part of the jaw
member overhangs the forwardly projecting lip
15
or extension 7 on the slide 5.
In the use of the device the cable 2| is ?rmly
attached to the clamp |8—|9 so as to make a
substantially permanent connection. The con
necter is then hooked onto the track rail by
bringing the overhanging claw 3 against one
20 ?ange of the rail and pulling it up tightly against
devices just described, the arrangement is such
the rail. The operator, holding handle |5—I6 in
the position shown in Fig. 1 then slides the slide
that when the operator grasps the handle IE5 or
33 to move the clamping element toward the
forwardly as far as it will go to engage the other
?ange of the rail. Downward pressure is then
?ange of the rail the jaw is opened, thus facili
tating the application of the connecter to the
rail. Likewise, in either form, the application 25
25 applied to the handle |5--|6, and the movement
of downward pressure on the handle forces the
of the cam !3 under the overhanging lip 9 causes
the jaw to be rocked in such manner that the lip
jaw into rail-clamping position.
portion 8a thereof is pressed ?rmly against the
?ange of the rail. Upon release of pressure from
the handle |5—|6, the member remains clamped
the device provides a very simple and eifective
clamp which can be used with rails of a wide
variety of sizes and wherein contact with rela 30
tively wide surfaces of the rail is assured, so that
to the rail.
When it is desired to release the
Either form of
clamp, the handle |5-|5 is lifted up, relieving
even though the rail might be slightly rusty,
the pressure from the under surface of the rear
nevertheless, a good connection will be made.
While I have shown and described certain pre
ferred embodiments of my invention, it will be 85
understood that various changes and modi?ca
ward extension 9.
Further continued upward
35 movement of the handle causes the nose I4 to
press down against the lug iii, exerting a lift
ing movement to the jaw, so that the portion 8a
will be forced out of contact with the ?ange of
the rail. The slide can then be easily retracted
and the connecter released from engagement
with the rail.
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The device does not require the use of any
springs and the clamping pressure exerted by the
jaw is always exerted against the ?ange of the
45 rail, tending to pull the slide member 4 against
the bottom of the bar 2.
There are no contact
points where the pressure is localized against the
bar 2, so that the bar 2, if it be made of copper
or other relatively soft conducting material, is
50 not dented or mutilated in the operation of
clamping the connecter to the rail.
The arrangement shown in Figure 6 shows a
generally similar device but wherein the jaw
member is provided with gear teeth to engage
55 corresponding gear teeth on the operating mem
ber. In this ?gure 24 designates a body mem
ber in all respects similar to the body member 2
previously described and, therefore, only a small
portion of the body member 24 is shown in Fig
ure 6. 25 designates a slide member movable
along the bar or body 24 and constructed simi
larly to the slide member Al shown in Figure 4.
This slide member 25 has upwardly extending
side members 26 similar to the side members 6 of
65 the member shown in Figure 4. The jaw 2'? is
generally similar to the jaw member 8 of Figure 3,
having a forwardly extending lip portion for en
gagement with the ?ange of the rail, this lip por
tion being designated 21a and being widened outin
70 the same manner that the jaw member previously
described is widened. It has a portion 28 disposed
between the two side plates 26 through which the
pivot pin 29 passes, and rearwardly of the pivot
pin the portion 28 is provided with an arcuately
75 disposed series of gear teeth 30. Supported on
tions may be made within the contemplation of
my invention and under the scope of the follow
ing claims.
40
I claim:
1. A ground rail connecter clamp comprising a
bar-like body member having a rail ?ange en
gaging claw at one end thereof, a slide member
having a guideway therein in which guideway
the bar-like body member is received and in 45
which said body member has a sliding ?t, and. an
adjustable jaw element on the slide member
mounted for movement about a ?xed point on the
slide and movable vertically into and out of
clamping engagement with the ?ange of a rail 50
engaged by the connecter.
2. A ground rail connecter clamp comprising
a bar-like body member having a rail ?ange en
gaging claw at one end thereof, a slide member
on the body member, said slide member having 55
a guideway therethrough to receive the body
member, said slide member having upstanding
side portions, a movable jaw member pivotally
supported between said upstanding side portions,
and operating means for said jaw.
3. A ground rail connecter clamp comprising a
bar-like body member having a rail ?ange en
gaging claw at one end thereof, a slide member
mounted on the body member for movement lon
gitudinally thereof, a rail ?ange engaging jaw 65
member pivotally supported on the slide mem
her, and operating means for the jaw pivotally
mounted on the slide member.
4. A ground rail connecter clamp comprising a
bar-like body member having a rail ?ange en 70
gaging claw at one end thereof, a slide member
mounted on the body member for movement lon
gitudinally thereof, a rail ?ange engaging jaw
member pivotally supported on the slide member
and having a rearwardly extending operating 75
2,068,528
extension, and an operating member pivotally
supported in the slide member having motion
transmitting means thereon cooperating with the
rearwardly extending portion of the jaw member
for transmitting motion thereto.
5. A ground rail connecter clamp comprising a
bar-like body member having a rail ?ange en
gaging claw at one end thereof, a slide member
mounted on the body member for movement
3
7. A ground rail connecter clamp comprising a
bar-like body member having a rail ?ange engag
ing claw at one end thereof, a slide member mov
able along the body member and having a sliding
?t thereon, a movable jaw member on the slide
member movable vertically into and out of en
gagement with the ?ange of a rail to be engaged
by the clamp, operating means on the slide mem
ber, and means operatively connecting the operat
longitudinally thereof, a rail ?ange engaging _ ing means and the jaw for positively transmitting 1O
jaw member pivotally supported on the slide motion in two directions from the handle mem
ber to the jaw member.
member and having a rearwardly extending por
8. A ground rail connecter clamp comprising a
tion with projections thereon, an operating han
dle pivotally supported on the slide member, said bar-like body member having a rail ?ange en
15 operating handle having a forwardly extending gaging claw at one end thereof, a slide member
portion with projections thereon inter?tting with movable along the body member and having a
sliding ?t thereon, a movable jaw member on the
the projections on the rearwardly extending por
tion of the jaw whereby movement of the handle slide member movable vertically into and out of
downwardly causes a downward movement of
20 the jaw and an upward movement of the handle
effects an upward movement of the jaw.
6. A ground rail connecter clamp comprising a
bar-like body member, having a rail flange en
gaging claw at one end thereof, a slide member
movable along the body member, an operating
handle pivotally supported on the sliding member,
a rail ?ange engaging jaw member also pivotally
supported on the slide member, and cooperating
means on the handle member and jaw member
30 for transmitting motion from the handle member
to the jaw member.
engagement with the ?ange of a rail to be en
gaged by the clamp, operating means on the 20
slide member, and means operatively connecting
the operating means and the jaw for positively
transmitting motion in two directions from the
handle member to the jaw member, said last
named means including a cam on the handle
member cooperating with the cam-engaging sur
face on the jaw member, the cam being movable
to an over-center position whereby pressure on
the jaw will not e?ect movement of the handle
member.
CECIL R. ANDERSON.
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