Trolley Wheel For Electric Cars Page: 2 of 2
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UNITED
STATES
PATENT OFFICE.
JAMES A. CRAWFORD AND THOMAS E. CROW, OF DALLAS, TEXAS.
TROLLEY-WHEEL FOR ELECTRIC CARS.
SPECIFICATION forming part of Letters Patent No. 589,702, dated September 7, 1897.
Application filed September 12, 1896. Serial No, 605,630. (No model.)To all whomvl it 7ay conLcen:
Be it known that we, JAMES A. CRAvWFORD
and THOM AS E. CROW, citizens of the United
States, residing at Dallas, in the county of
5 Dallas and State of Texas, have invented
a new and useful Improvement in Trolley-
Wheels for Electric Cars, of which the follow-
ing is a specification.
Our invention relates to improvements in
to trolley-wheels for electric cars in which two
friction-disks are employed on either side of
an ordinary trolley-wheel acting on the same
axle, our object being to prevent the trolley-
wheel from running off of the electric wire
15 while the car is in motion. We attain this
object by the mechanism illustrated in the
accompanying drawings, in which-
Figure 1 is a side elevation of the device
complete, showing a section of the trolley-pole
20 attached thereto. Fig. 2 is a section through
Fig. 1 from A to A.
Similar numerals of reference refer to simi-
lar parts throughout the two views.
The numeral 1 is the trolley-pole, having se-
25 cured to its uppermost end (by bolts 1) the
supporting-frames 2 and 3, which engage the
axle 4, which carries the trolley-wheel 5, and
the friction-disks 6 6, which are provided with
thimbles 7 (which encircle the axle) and with
30 lugs 8.
As to the operation of our device, it will be
observed that the friction-disks are circular
in shape, having the holes for the axle which
carry them a little removed from their geo-metrical centers, while the trolley - wheel 35
(which is carried by the same axle) has the
axle-hole in the exact center, the whole being
so arranged that the longer edges 6, of the
friction-disks will of their own .weight hang
down below the trolley-wheel. Should the 40
trolley-wheel attempt to run off of the electric
wire 9, friction is created-by the wire on either
of the uppermost edges 10 of the friction-
disks, turning the flange or flanges thus ef-
fected in an opposite direction (around the 45
axle) to that in which the car is traveling un-
til the lugs S come in contact with the pro-
jections S8. The revolution of the flanges
now immediately stops, leaving the lower
edges of the flanges at the highest position 50
above the trolley-wheel, thus preventing the
trolley-wheel from running off of the electric
wire.
HIaving thus explained all that is necessary
for the full understanding of those skilled in 55
the art to which it appertains, what we claim
as new, and desire to secure by Letters Pat-
ent of the United States, is-
A trolley for electric cars, comprising a
frame, a wheel, a wheel-axle, disks eccentric- 60o
ally journaled upon the axle, lugs upon the
disks, and projections upon the frame lying
in the path of said lugs.
JAMES A. CRAWFORD.
THOMAS E. CROW.
Witnesses:
J. A. CRAWFORD, Jr.,
CHAS. E. COoIMBES.
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Crawford, James A. Trolley Wheel For Electric Cars, patent, September 7, 1897; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth174733/m1/2/?q=%22%22~1: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.