An Improvement or Improvements in the Arms used for Supporting Insulators on Telegraph Poles.
Year: 1893

page_text: Date of Application, 28th Jan., 1893
Complete Specification Left, 18th Oct., 1893-Accepted, 18th Nov., 1893
PROVISIONAL SPECIFICATION.
An Improvement or Improvements in the Arms used for Supporting
Insulators on Telegraph Poles.
I THOMAS GEORGE MARSH of Dixon's Green Dudley in the County of
Worcester Mining Engineer do hereby declare the nature of this invention to be
as follows:-
My invention has reference to tubular metallic arms used for supporting
insulatora on telegraph poles; and my said invention consists in constructing the
said metallic arms in the manner hereinafter described, whereby the said arms can
be readily fitted in the slots usually cut in telograph poles.
In making a tubular metallic arm for the purpose described I take a hollow or
tubular piece of wrought iron or other hard and durable metal the said tubular
piece being preferably circular or oval in cross section and by rolling, drawing or
pressing operations I flatten the sides of the whole or a portion of the length of
the said tubular piece. By the flattening described a tubular arm is produced
square in cross section at the flattened parts. Or the tube may be flattened on
three sides and curved on the remaining side. The square tubular arm is readily
fitted in the slot usually cut in the telegraph pole and fastened by the ordinary
cross bolt. When the tubular arm is flat on three sides only the curved part of
the arm constitutes the outer or front side and the opposite part the flat back of
the arm which with portions of the flat top and bottom of the arm are fitted into the
slot in the telegraph pole and fastened therein as before described.
When the flattoning is restricted to a portion of the arm, say, for example the
middle or that part which is to be fitted in the slot of the telegraph pole, tho said
part only of the arm is treated in the manner hereinbefore described, the parts
on either side the square or nearly square part being circular or oval in cross
section.
I do not limit myself to any particular way of fastening the insulators to the
tubular arms described or the said arms to the telegraph poles the essence of my
invention consisting in giving the tubular metallic arms used for supporting
telegraph insulators on poles such a figure in cross section through the whole or a
portion of their lengths that the said arms can be readily fitted and fastened in the
ordinary slots in telegraph poles.
Dated this 28th day of January 1893.
W. T. WHITEMAN,
Agent for the Applicant.
COMPLETE SPECIFICATION.
An Improvement or Improvements in the Arms used for Supporting
Insulators on Telegraph Poles.
'
I THOMAS GEORGE MARSH, of Dixon's Green Dudley, in the County of
Worcester Mining Engineer do hereby declare the nature of my said 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 has reference to tubular metallic arms used for supporting
insulators on telegraph poles and my said invention consists in constructing the
said metallic arms in the manner hereinafter described, whereby the said armis can
be readily fitted in the slots usually out in telegraph poles.

page_text: In making a tubular metallic arm for the purpose described I take a hollow or
tubular pieco of wrought iron or other hard and durable metal the said tubular
piece being preferably circular or oval in cross section and by rolling, drawing or
pressing operations I Batten the sides of the whole or a portion of the longth of
the said tubular piece. By the flattening described a tubular arm is produced
square in cross section at the flattened parts. Or the tube may be flattened on
three sides and curved on the remaining side. The square tubular arm is readily
fitted in the slot usually cut in the telegraph pole and fastened by the ordinary
cross bolt. When the tubular arm is flat on three sides only the curved part of
the arm constitutes the outer or front side and the opposite part the flat back of the
arm, which with portions of the flat top and bottom of the arm are fitted into the
slot in the telegraph pole and fastened therein as before described.
When the flattening is restricted to a portion of the arm, say, for example, the
middle or that part which is to bo fitted in the slot of the telegraph pole, the said
part only of the arm is treated in the manner hereinbefore described, the parts
on either side the square or nearly square part being circular or oval in cross
section.
I do not limit myself to any particular way of fastening the insulators to the
tubular arms described, or the said arms to the telegraph poles, the essence of my
invention consisting in giving the tubular metallic arms used for supporting
telegraph insulators on poles, such a figure in cross section through the whole or a
portion of their lengths that the said arms can be readily fitted and fastened in the
ordinary slots in telegraph poles.
Figure 1 of the accompanying drawing represents in side elevation and Figure 2
in longitudinal section, a tubular metallic arm for supporting insulators on telegraph
poles, the said metallic arm being made according to my invention;
Figure 3 represents the same fitted in the slot of and fastened to a telegraph
pole;
Figures 4, 5 and 6 reprosent cross sections of the metallic arm taken respectively
through the dotted lines a, b and c of Figure 1.
The same letters of reference indicate the same parts in the several figures of the
drawing.
The tubular metallic arın represented is square in cross section at the middle or
at that part of the arm which is to be fitted in the ordinary slot of the telegraph
pole (see the cross section Figure 6), the said square middle part being marked d,
and the ends of the tubular arm or the parts on either side the square part, aro
cylindrical (see the cross section Figure 4) the said cylindrical ends or parts being
marked e, e. Instead of the cylindrical onds represented, the ends of the tubular
metallic arm may be elliptical or of other figure in cross section. Two of the
opposite flat sides of the middle part d of the arm are perforated with holes at f for
the passage through them of the ordinary cross bolt g for fastening the arm to the
telegraph poloh as represented in Figure 3. The manner in which the three sides
or flattened middle part of the metallic arm is fitted in the ordinary slot of the
telegraph pole will be understood by referring to the said Figure 3. The cylindrical
ends e,e of the metallic arm are perforated with holes at i, i for fastening the
insulators to the said arm in the ordinary way. In order however to obtain a firm
bearing of the insulator stalks upon the cylindrical ends of the metallic arm, the
parts surrounding the holes i, i are preferably flattened or depressed as best seen in
the cross section Figure 5.
Although I prefer to make the metallic tubular arm flat sided or square in cross
section at its middle or at the part which takes into the slot in the telegraph pole,
yet one of the fint sides may be replaced by a curved side, the said curved side
when the metallic arm is fixed to the telegraph pole being the outer side.
Or in place of restricting the squaro or nearly square portion of the arm to tho
middle as described and represented, the whole of the length of the tubular arm
may have flattened sides or be square in oross section or be flattened on three sides
and curved on the remaining side.

page_text: As the rolling, drawing or pressing operations which I employ in carrying my
invention into effect are of the kinds commonly used in the manufacture of other
tubular metallic articles and constitute no part of my invention, I do not think it
necessary to describe the same.
Having now particularly described and ascertained the nature of my inven-
tion and the manner in which the same is to be performed I declare that I claim as
my invention ;-
The improvement or improvements in the arms used for supporting insulators on
telegraph poles hereinbefore described and illustrated in the accompanying drawing:
that is to say, making metallic tubular arms for the purpose described flat sided or
nearly flat sided through the whole or through a portion of their lengths preferably
at their middlos, so that the said arms can be readily fitted and fastened in the
ordinary slots of telegraph poles Bubstantially as described and illustrated.
Dated the Twelfth day of October 1893.
THOMAS GEORGE MARSH.