Trolley-Pole Head. Page: 3 of 3
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93
760,184
mounted, said wheel and the bearings there-
for being of any approved form and construc-
tion which will accomplish the purposes for
which they are employed.
5 From the above description, taken in con-
nection with the drawings, it will be seen that
during the progress of the car the trolley-
wheel, by virtue of the rotatability of its harp,
will at all times assume a position at such an
'o angle as to suit the irregularities or curves in
the line-wire and will at all times maintain a
contact with said wire when the car is run-
ning around curves or being switched from
one track to another. It will also be seen that
15 the function of the spring 18 is to hold the
wheel normally in the same vertical plane as
the pole and that said spring serves to return
the harp and wheel to their normal position
when the car passes from a curve to a straight
20 track. In order to prevent the harp from be-
ing rotated such a distance as to throw the
wheel transversely of the wire, and thereby
prevent its running along the one or being
thrown into operative engagement therewith,
25 I provide at suitable points upon the periph-
ery of the curved upper surface 3 of the head
vertical studs or abutments 23, the upper ter-
minals of which extend upwardly for such a
distance as to be in the path of movement of
30 the arm 14, so that in the rotation of the plate
12 said arm will abut against said studs 23,
whereby the rotation of the harp is limited.
The base-plate 12 of the trolley-harp is held
in close proximity with the upper surface 3
35 of the head 2 by means of the annular flange
10 on the pin 7, which when the parts of the
.device are assembled rests upon the upper
.surface of said plate 12 and prevents vertical
movement thereof.
40 In order to prevent the wheel and its harp
from being struck by the guy-wires in cases
when the wheel flies off the wire, I provide a
guard, which is positioned on the pole, closely
adjacent the end thereof, and against which
45 the force of the blow will be exerted and
which will serve to guide the wire upwardly
over the wheel without striking the harp. I
have shown this guard as consisting of an in-
clined bar 24, the lower end of which termi-
50 nates at a point on the pole where it is pro
vided with a threaded portion 25, disposed at
an angle to the bar 24 and adapted to be pro-
jected through an aperture 25 in the pole,
said threaded portion extending a short dis-
55 tance beyond the lower side, where it is en-
gaged by a nut 26 for the purpose of fasten-
ing the lower end of the guard to the pole.
The downward movement of the threaded por-
tion is limited by means of a flange 27, formed
6o integral with the bar and adapted to engage
the upper side of the pole. From its lower
end the bar 24 is inclined upwardly at the
proper angle to a point adjacent the wheel,
where it is bent downwardly to provide a ver-tical supporting-leg 28, which at its lower end 65
is threaded, as at 29, and is projected through
an opening 30 in the pole adjacent the base
of the harp, where it is secured rigidly by
means of a nut 31 on said threaded portion,
the downward movement of the leg 28 being 70
limited by the annular flange 32. It will be
seen that should the wheel fly off the wire the
guy-wires instead of striking the pole and be-
ing directed against the harp will strike the
inclined bar 24, which will guide the guy- 75
wire upwardly over the top of the wheel.
Having thus described the invention, what
I claim as new, and desire to secure by Letters
Patent, is-
1. In a trolley-head the combination with a 8o
pole, of a bearing-pin rigidly mounted there-
on, a wheel-harp rotatably mounted on said
pin, an arm on the harp and a spring secured
to the arm and engaging the bearing-pin.
2. In a trolley-head, the combination with a 85
pole, of a bearing-pin rigidly mounted there-
on, a wheel-harp comprising a base-plate ro-
tatably mounted upon said bearing-pin and
provided with a radial arm, and a spring rig-
idly secured to said arm at one end and slid- 90
ably engaging the bearing-pin at its opposite
ends.
3. In a trolley-head, the combination with a
pole having an aperture therein, of a bearing-
pin rigidly mounted in said aperture and 95
formed with an annular flange, a harp com-
prising a base-plate rotatable upon said pin
and arranged beneath the flange, said plate
being formed with a rearwardly-projecting
arm, and a spring secured to said arm and en- 100
gaging the bearing-pin.
4. In a trolley-head, the combination with a
pole, of a bearing-pin rigidly mounted there-
on, a harp comprising a base-plate rotatably
mounted upon said bearing-pin, said plate be- 105
ing provided with a radial arm formed with
a vertical post, and a spring secured to said
post and slidably engaging the bearing-pin.
5. In a trolley-head, the combination with a
pole formed with a squared aperture therein,1 o
of a squared bearing-pin arranged within said
aperture and formed with a slot in its upper
portion, a harp including a base-plate, said
plate being rotatably mounted upon the pin,
a radial arm extending from said plate, and a 115
spring rigidly connected to said arm and mov-
ably engaging the slot in the bearing-pin.
6. In a trolley-head the combination with a
pole, of a bearing-pin rigidly mounted there-
on, a wheel-harp rotatably mounted on said 1 20
pin, and a spring secured to the harp and en-
gaging the bearing-pin.
In testimony whereof I affix my signature in
presence of two witnesses.
ROBERT I. E. DUNN.
Witnesses:
J. C. MUNDEN,
J. O. CATHEY.
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Dunn, Robert I. E. Trolley-Pole Head., patent, May 17, 1904; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth508545/m1/3/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.