Improvements in the Curving or Bending of Pipes or Conduits made of Paper or like Material used for Carrying Electric Wires and which are Enclosed in a Metallic Sheathing.
Year: 1897

page_text: Date of Application, 27th Aug., 1897-Accepted, 16th Oct., 1897
Patent Agent.]
Improvements in the Curving or Bending of Pipes or Conduits made
of Paper or like Material used for Carrying Electric Wires and
which are Enclosed in a Metallic Sheathing.
I, HUGH DONALD FITZPATRICK, of 70 Wellington Street, Glasgow, Registered
Patent Agent, 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:-
To bend over or curve paper pipes enclosed in a metallic sheathing it is necessary
in order to prevent the metallic sheath splitting or bursting, to make room for that
part of the sheath which bulges or creases at the inner circumference of the bend
and forms an external fold when the pipe is being bent. The object of this
invention is to effect such bending by means of appliances which can be constructed
in various ways.
And in order that my said invention may be properly understood I have here-
unto appended two explanatory sheets of drawings, whereon:-
Fig. 1 is a side view and Fig. 2 a front view of one form of the appliance.
Fig. 3 is a view of a bent pipe.
Fig. 4 is a side view and Fig. 5 a front view of a modified construction of the
disc B.
Fig. 6 is a view of a bent pipe.
Fig. 7 is a side view and Fig. 8 a front view of a pincer or wrench.
Figs. 9 and 10 are detail views.
Fig. 11 is a plan view of the wrench or pincer.
Fig. 12 shows a bent pipe.
Referring to the drawings whereon the same reference letters wherever repeated
indicate the same or similar parts.
As will be seen from Fig. 1 and 2 the bending over of the pipes is effected
by means of a disc B mounted on a frame A and provided with a circular groove a
formed with recesses b at the part of the disc which serves as a support or bearing
when bending the pipe E.
The axle c, c, of the disc B has a lever C connected with it which is provided
with a roller D capable of rolling along the outer edge or periphery of the disc.
The metallic cased paper tube or pipe E is introduced into the grip d, which
is controlled by a spring, and then the lever C is drawn forward from its open
or back position, indicated in dotted lines at Fig. 1, over the pipe E which is
securely held in place by the grip d. As the lever C moves forward its roller D
first comes in contact with the grip d and forces it inwards, thereby firmly holding
the pipe E in place, and then it acts upon the pipe E it-elf and bends it round
to the shape of the disc. As the pipe E bends creases or folds c are produced upon
its inner circumference as shown at Fig. 3. These creases or folds enter the

page_text: recesses of the circular groove a formed for their reception. The recesses
also help to firmly hold the pipe in position as it is being bent.
A plug of india-rubber or other suitable resilient material is placed in the pipe
before bending it over.
=
By means of this appliance comparatively short bends or elbow pieces can be
produced without any breaks or bursts occurring in the metallic sheath or casing
during the bending operation.
In the modification shown at Figs. 4 and 5 projections or teeth 6' are made
along the bottom of the groove a of the disc B instead of the recesses b. In this
case, as shown at Fig. 6, indentations are made in the pipe E during the bending
operation instead of the creases or folds e Fig. 3.
Indentations, such as shown at Fig. 6, can also be produced by means of the
wrench or pincers, shown at Figs. 7 to 11, the superfluous material bulging along
the inner circumference of the pipe bend being driven into the insulating pipe in
the manner shown at Fig. 12. To effect this one jaw f of the wrench is provided
with an indenting plate or knife 9 which is arranged perpendicularly to the surface
of the pipe to be bent over. The knife, which in its action corresponds to the
projections on the circular groove of the disc B Fig. 4, is notched or cut out
according to the diameter of the pipe to be bent and is sharpened at the cut out
part. The other jaw of the wrench is extended on both sides, that is to say,
in the longitudinal direction of the pipe to be bent and is moulded or hollowed
out at for the reception and support of the pipe (as shown at Figs. 8, 10 and 11).
The side walls of the jaw h are furnished with notches into which the straight
ends of parts of the knife g enter as the pipe is pressed or squeezed and bent by
the closing of the jaws of the wrench. The pipe I can, by means of this imple-
ment, be provided with indentations as shown at Fig. 12 and be bent at the
same time.
The invention can be used for bending insulating metallic pipes having the
insulating material composed of other pliable substances besides paper.
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
consider novel and desire to claim is:-
1. An appliance for bending or curving insulating pipes provided with a
metallic sheathing having a disc (B) or its equivalent provided with a series of
recesses or notches (6) within its circular groove or channel (a), substantially as
and for the purpose set forth.
2. The modified arrangement wherein projections (61) are made upon the surface
of the circular groove (a) of the disc (B) or its equivalent, substantially as and for
the purpose set forth.
3. A bending appliance consisting of a wrench or nipper provided with two jars
one jaw having an indenting knife or wedge and the other jaw a mould which also
serves as a support for the pipe being bent, substantially as herein before set forth.
Dated this 26th day of August 1897.
H. D. FITZPATRICK,
70 Wellington Street, Glasgow.