Improvements in Attaching Arms to Telegraph Poles.
Year: 1892

page_text: Date of Application, 16th July, 1892
Complete Specification Left, 14th Apr., 1893-Accepted, 20th May, 1893
PROVISIONAL SPECIFICATION.
Improvements in Attaching Arms to Telegraph Poles.
I, HOWARD COCHRANE JOBSON of Summer Hill, Kidderminster, Engineer, do
hereby declare the nature of this invention to be as follows:-
:-
When telegraph wires break a heavy twisting strain is thrown on the arms
carrying the insulators and this tends to loosen or destroy the fastening of the arm
to the pole. Thus if the arm be of rectangular section one or other corner of it
crushes in such a case into the wood of the pole allowing the bolt by which the arm
is secured to bend and the arm to turn.
1
According to this invention I overcome this difficulty by passing a vertical metal
strap or connection across the arm and securing it to the pole above or below or
preferably both above and below the arm.
The strap may either cross the arm on the outside or pass between it and the
pole. In the former case it is secured to the arm by the bolt and nut by which the
arm is fixed to the pole and thus any twisting strain is taken by the strap instead
of by the bolt. In the latter case the strap forms a lining between the arm and
the pole which prevents the corners of the arm from crushing the wood.
Dated this 16th day of July 1892.
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Attaching Arms to Telegraph Poles.
I, HOWARD COCHRANE JOBSON, of Summer Hill, Kidderminster, 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:---
When telegraph wires break a heavy twisting strain is thrown on the arms
carrying the insulators and this tends to loosen or destroy the fastening of the arm
to the pole. Thus if the arm be of rectangular section and especially if it be of
metal one or other corner of it crushes in such a case into the wood of the pole
allowing the bolt by which the arm is secured to bend and the arm to turn.
According to this invention 1 overcome this difficulty by passing a vertical metal
strap or connection across the arm and securing it to the pole above or below or
preferably both above and below the arm.
The strap may either cross the arm on the outside or pass between it and the
pole. In the former case it is secured to the arm by the bolt and nut by which the
arm is fixed to the pole and thus any twisting strain is taken by the strap instead
of by the bolt. In the latter case the strap forms a lining between the arm and
the pole which prevents the corners of the arm from crushing the wood.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is an elevation of a telegraph pole having the arm attached to it in
accordance with this invention.
Figures 2 and 3 are vertical sections of the pole shown in Figure 1, with square
and circular arms respectively.

page_text: "
a is the pole, the arm, c the bolt and nut securing the arm to the pole and d is
a strap secured to the pole by nails or screws e.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
'
1. The combination of a strap with the pole and arm substantially as described.
2. The means of attaching arms to telegraph poles substantially as described and
:shown in the drawings.
HOWARD C. JOBSON.