Improvements in Attachments for Telegraph Poles for Carrying Insulators.
Year: 1891

page_text: Date of Application, 26th Mar., 1891
Complete Specification Lelt, 22nd Dec., 1891-Accepted, 23rd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Attachments for Telegraph Poles for Carrying
Insulators.
I HOWARD COCHRANE JOBSON of Summer Hill Kidderminster in the County
of Worcester Telegraph Engineer do hereby declare the nature of this invention to
be as follows:-
My invention consists of the improvements hereinafter described in constructing
attachments for telegraph poles for carrying insulators. By my invention very
efficient attachments are produced and the disadvantages attending the ordinary
method of attachment are wholly or mainly avoided.
In the ordinary method of attaching insulators to telegraph poles the insulators
are generally fixed in the case of wooden poles to wooden arms and in the case of
iron poles to iron brackets secured to the poles. There are many disadvantages
attending the use of wooden arms. For example the weakness in and unreliability
of the material; time required for seasoning shrinkage and development of flaws
during seasoning; the cost of preserving the timber by painting and the difficulty
of obtaining timber free from knots shakes and the like. The use of the usual
iron brackets is also attended with many disadvantages which are obviated by the
use of my invention.
According to my invention I employ an attachment for telegraph poles for
carrying insulators consisting of an arm made of steel or iron or other suitable
metal having preferably the figure in cross section of channel or trough iron that
is the said attachment or arm consists of a flat or buckled back having parallel
horizontal projecting sides or flanges to which sides or flanges the insulators are
attached. The attachment or arm is arranged preferably when in use with its
flat or buckled back to the pole the opening at front being turned outwards. The
back of the attachment or arm may have a contour given to it proper for enabling
it to seat itself closely against the pole to which it is fixed. This construction of
attachment or arm permits it to be used in the slot usually cut in wooden poles
and the hollow attachment or arm may if desired be strengthened by tubular or
other distance pieces.
My improved attachment or arm is connected to the pole either by screw bolts
secured to the back of the arm and passed through the pole or by a clip; but I do
not limit myself to any particular way of connecting the attachment or arm to
the pole.
The horizontal flanges constituting the sides of the hollow or trough shaped
attachment or arm are provided with holes at the required distances apart for
receiving the insulator stalks or bolts. The said holes may be furnished with
collars or washers of any desired form and material for electrically disconnecting
the insulator stalks or bolts from the metal attachment or arm supporting them.
By this method of connection a very efficient insulation of the telegraph wires
result.
Dated the 26th day of March 1891.
W. T. WHITEMAN,
Agent for the Applicant.

page_text: COMPLETE SPECIFICATION.
Improvements in Attachments for Telegraph Poles for Carrying
Insulators.
I HOWARD COCHRANE JOBSON of Summer Hill Kidderminster in the County
of Worcester Telegraph Engineer do hereby declare the nature of my 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 consists of the improvements hereinafter described in constructing
attachments for telegraph poles for carrying insulators. By my invention very
efficient attachments are produced and the disadvantages attending the ordinary
method of attachment are wholly or mainly avoided.
In the ordinary method of attaching insulators to telegraph poles the insulators
are generally fixed, in the case of wooden poles, to wooden arms and in the case
of iron poles to iron brackets secured to the poles. There are many disadvantages
attending the use of wooden arms. For example the weakness in and unreliability
of the material; time required for seasoning, shrinkage and development of flaws
during seasoning, the cost of preserving the timber by painting and the difficulty
of obtaining timber free from knots, shakes and the like. The use of the usual
iron brackets is also attended with many disadvantages which are obviated by the
use of my invention.
According to my invention I employ an attachment for telegraph poles for
carrying insulators consisting of an arm made of steel or iron or other suitable
metal having preferably the figure in cross section of channel or trough iron;
that is, the said attachment or arm consists of a flat or buckled back having
parallel horizontal projecting sides or flanges to which sides or flanges the insulators
are attached. The attachment or arm is arranged preferably, when in use, with its
flat or buckled back to the pole, the opening at front being turned outwards. The
back of the attachment or arm may have a contour given to it proper for enabling
it to seat itself closely against the pole to which it is fixed. This construction of
attachment or arm permits it to be used in the slot usually cut in wooden poles
and the hollow attachment or arm may if desired be strengthened by tubular or
other distance pieces.
My improved attachment or arm is connected to the pole either by screw bolts
secured to the back of the arm and passed through the pole or by a clip; but
I do not limit myself to any particular way of connecting the attachment or arm
to the pole.
The horizontal flanges constituting the sides of the hollow or trough shaped
attachment or arm are provided with holes at the required distances apart for
receiving the insulator stalks or bolts. The said holes may be furnished with
collars or washers of any desired form and material for electrically disconnecting
the insulator stalks or bolts from the metal attachment or arm supporting them.
By this method of connection a very efficient insulation of the telegraph wires
results.
I will now proceed to describe with reference to the accompanying drawings the
manner in which my invention is to be performed.
Figure 1. represents in elevation a portion of a telegraph pole to which are
connected three attachments or arms constructed according to my invention for
carrying insulators, and Figure 2. represents a plan of one of the said attachments
or arms, the insulators being omitted.
Figure 2 represents a plan of a modified attachment or arm.
The attachments or arms represented in Figure 1. illustrate different modifica-
tions of my invention and are shown drawn to a larger scale in Figures 3. 4.
and 5; Figure 3. representing a cross-section of the top arm Figure 1. and its
insulator and insulating collars or washers; Figure 4. representing a cross section

page_text: of the middle arm Figure 1. and its insulator and insulating collars or washers,
together with the elliptical shaped distance piece combined with the arm and
Figure 5. representing a cross-section of the extended tubular distance piece of the
bottom arm Figure 1, and the insulator and its insulating collars.
Figure 6. represents a cross section, drawn to the same scale as Figures 3. 4.
and 5., of a modified insulating arrangement as hereinafter described.
The same letters of reference indicate the same parts in the several figures of
the drawings.
a. is the telegraph pole (see Figures 1. and 2.) and b. is the attachment or arm
carrying the insulators the said attachment or arm having in cross-section the
figure of a channel or trough (or a figure approximating thereto) as best seen in
the cross-sections Figures 3. 4. 5. and 6.
By an examination of the said Figures 3. 4. 5. and 6. it will be seen that the
attachment or arm consists of a flat (or it may be buckled) back having parallel
horizontal sides or flanges, to which sides or flanges the stalks y of the insulators f.f.
Figures 3. 4. and 6, are fixed. The said arm or attachment is secured in a slot
in the telegraph pole or other like support, by the cross bolt k. passed through the
back of the arm or attachınent and through the pole and fixed by a screw nut as
represented in Figure 2.
The insulators f. f. are secured to the flanges or sides of the trough shaped
attachment or arm b. by means of their bolts or stalks g. being passed through
holes in the said flanges and secured at bottom by screw nuts h. and washers i. as
represented in the several figures of the drawings.
Instead of letting the trough shaped arm into a slot in the telegraph pole, the
pole may be unslotted and the said arm curved at its middle or any other part so
as to fit the pole as represented in Figure 2^.
I have represented in the accompanying drawings the arrangements constituting
my invention for electrically insulating the insulator stalks from the metal
attachment or arm . and from the tubular distance piece.
The upper arm or attachment b. in Figure 1. (shown also in section in Figure 3.)
consists only of an iron or steel channel or trough shaped bar and the stalks g.
of the insulators are electrically disconnected from it by the top and bottom
insulating collars or washers d. d. made of china, ebonite, or other insulating material.
The middle trough shaped arm or attachment b. in Figure 1 (shown also in
section in Figure 4) is strengthened by the elliptical (or other tubular) distance
piece c. extending from one end to the other end of the trough shaped arm, the
position of the distance piece c. in the arm b. being best seen in Figure 4. The
distance piece c. is secured to the trough shaped arm by screw bolts and nuts or
otherwise.
In the middle arm or attachment, the insulator stalks are electrically discon-
nected from the said arm or attachment b. and from the tubular distance piece c.
by the collars or washers d. d. of the kind represented in connection with the
top arm.
The bottom arm or attachment b. Figure 1. (shown also in Figure 5,) is a short
trough shaped bar in combination with which a cylindrical (or other tubular)
distance piece is used, the said distance piece c² extending considerably on either
side; the insulators f. being attached by their stalks g. to the extended parts of
the said distance piece c² as represented. The stalks of the insulators f. are
electrically disconnected from the distance piece c² by washers or collars d. d. of
the kind described and represented in connection with the insulators fixed directly
to the trough shaped arms or attachments.
Figure 6, represents in section a modified arrangement for insulating the
insulator stalks.
In this arrangement the bottom washer d' has a tubular collar d³ surrounding
the insulator stalk g. and on the top flange of the arm b. an insulator consisting
of a lath d of wood or other insulating material is placed, the said lath d serving
to insulate the whole of the insulators situated on the arm or attachment.

page_text: Although I prefer to use the insulating washers d. d. yet they may be dispensed
with when a high insulation is not required.
The arrangements described and represented for electrically disconnecting the
insulator stalks from the supporting attachments or arms may be applied to
attachments or arms of other constructions than those in connection with which
I have described them.
Any required number of insulators may be fixed to the attachment or arm and
an arm can be supported by one or more poles.
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 ;-
First. Making attachments for telegraph poles carrying insulators of channel or
trough shaped iron or steel or other metal or alloy or having approximately the
figure of channel or trough iron, and attaching the insulator stalks to the said
channel or trough shaped attachments or arms substantially as herein before described
and illustrated in the accompanying drawings, whether the back of the channel or
trough shaped attachments or arms be flat or buckled.
Secondly. The combination with attachments or arms of the kind referred to in
the prior claim of tubular or other distance pieces as hereinbefore described and
illustrated in the accompanying drawings, whether the said distance pieces be
confined within the trough shaped attachments or project therefrom and carry the
insulators as described and illustrated.
Thirdly. The several arrangements or combinations of parts hereinbefore
described and illustrated in the accompanying drawings for insulating the stalks
of the insulators from the channel or trough shaped attachments or arins or other
attachments or arms and from the distance pieces carried by the said channel or
trough shaped attachments or arms.
Dated the 19th day of December 1891.
HOWARD COCHRANE JOBSON.