Improved Method of Crossing the Ends of Drum Armatures of Dynamos.
Year: 1889

page_text: Date of Application, 13th May, 1889
Complete Specification Left, 25th Jan., 1890-Accepted, 1st Mar., 1890
PROVISIONAL SPECIFICATION.
Improved Method of Crossing the Ends of Drum Armatures of
Dynamos.
JOHN FARQUHARSON of Pomona House Kings Road Fulham London Electrical
Engineer do hereby declare the nature of this invention to be as follows:-
A tape or ribbon of copper of sufficient length to connect bars on opposite sides of
the armature in one length without a joint is folded in the middle as shewn in the
drawing. The ends are turned in opposite directions and connected to the bars on the
drum.
The tape may be of one or more thicknessess as convenient.
Fig. 1 shews the tape folded in the middie. Fig. 2 shews the tape in position
on the armature. B is the shaft of the Dynamo A A is the tape in position.
Dated thin 12th dov
May 1980
JOHN FARQUHARSON.
COMPLETE SPECIFICATION.
Improved Method of Crossing the Ends of Drum Armatures of
Dynamos.
I JOHN FARQUHARSON of Woodlands Cottage, High Street, Acton, Middlesex,
Electrical Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement :-
My invention relates to end connections for joining the conducting bars on opposite
sides of Drum Arinatures of Dynamo Machines or Motors.
The object of the invention is to reduce the waste of energy in heat; and reduce
the cost of end crossings of machines with large currents.
For this purpose I make the end connection of copper tape or ribbon in one length
without joint.
The copper tape may be of one or more thicknesses. It is folded in
the middle in such a way that when the ends are bent in opposite directions to pass
the shaft, they are not in the same plane and suitable for joining the ends of alternate
bars of unequal lengths on opposite sides of the Armature.
To secure perfect connection of the bars and crossings at their junction without
rivets or screws commonly used for the purpose, I form a socket on each end of the
crossing of such a form as to completely surround the bar and be brought into close
contact by wedging on the top, thus obtaining complete surface contact of the copper
conductors at their junction without the use of solder of much greater resistance and
which melts at comparatively low temperature.
Fig. 1 and 2 of the accompanying drawing are sectional views of a Drum Armature
shewing end connections on my plan:- the shaft, a the Armature bars, 6 the
crossing.
Fig. 3. 4. 5 are views of the crossing on a larger scale.
Fig. 3. the method of folding the tape.
Fig. 4. an end view of the junction of the crossing and bar.-a. the bar. b. the
crossing. c. the wedge.
Fig. 5. a side view-a. the bar. b the crossing. c the wedge.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion and how it is performed I declare that what I claim is in a Drum Armature of a
Dynamo Machine or Motor for large currents.
1. Forming the end crossing connectors in one length without joint in the manner
described.
2. Forming the end socket and junction with the bar as and for the purpose
described.
Dated this 94th love of Lann 1800
JOHN FARQUHARSON.