IMPROVEMENTS IN CONTACT MAKERS FOR ELECTRIC TRAM CARS
Year: 1884

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I MICHAEL HOLROYD SMITH of Royal Insurance Buildings, Halifax, in the
County of York, Consulting and Mechanical Engineer do hereby, declare the nature
of my said invention for "IMPROVEMENTS IN CONTACT MAKERS FOR ELECTRIC
TRAM CARS" to be as follows:-
This invention consists of an improved method of conveying the electric
current to or from the motor on the car and the rails by means of the wheels
and axles.
1
According to this my invention I employ hollow segmental blocks of metal
preferably three placed at regular intervals round the axles-These blocks are
secured by means of studs to a band or sheet of metal bent round them but which
does not complete a circle the ends being turned outwards and attached to suitable
supports under the car-By tightening a bolt passed through these radial ends the
band is made to clip the segmental blocks and regulate their pressure against the
periphery of the axle-These adjustable contact clips may be used on one or both
axles, and attachments made with the motor by wire and terminals in the ordinarý
way.

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COMPLETE SPECIFICATION.
I MICHAEL HOLROYD SMITH of Royal Insurance Buildings, Halifax, in the
County of York, Consulting and Mechanical Engineer, do hereby declare the nature
of my said invention for " IMPROVEMENTS IN CONTACT MAKERS FOR ELECTRIC
TRAM CARS and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:--
"
This invention consists of an improved method of conveying the electric
current to or from the motor on the car and the rails by means of the wheels
and axles.
Such being the nature and object of my said invention the following is a
complete description of same, reference being had to the accompanying drawings
forming a part of this specification in which
Fig. 1 is a section through axle of car with segmental-blocks attached.
Fig. 2 is a like cross section.
Fig. 3 is a side elevation.
According to this my invention I employ hollow segmental blocks of metal 1,
preferably. three, though other number of such blocks may be used as shewn at
Fig. 2, .placed at regular intervals round the axles 2-The blocks 1 are secured by
means of studs 3 to a band or sheet of metal or spring 4 bent round the said blocks
and axles but which bands 4 do not complete a circle, the ends being turned
outwards and attached to suitable supports 5 under the car-By tightening the
adjusting bolt 6 passed through the ends of the band 4 the latter is made to clip
the segmental blocks 1 and regulate their pressure against the periphery of the
axle 2, or the elastic rings 6 may be used in lieu of the adjusting screw 6-These
adjustable contact clips may be used on one or both axles and attachments made
with the motor by wire 7 and terminals 8 in the ordinary way, or electric
connection can be made by attachment to any of the studs 3 or to a special
terminal such as 8ª.
•
Having now particularly described, and ascertained the nature of my said
invention, and in what manner the same is to be performed; I declare that what
I claim is
The segmental.blocks, adjustable bands in combination with the axle, and as and
for purpose herein described.