Year: 1889

page_text: We, ANDREW BELL JARDINE, JAMES JARDINE, JOHN JARDINE and PETER JARDINE,
all of Hespeler, in the County of Waterloo, in the Province of Ontario, in the
Dominion of Canada, Machinists, 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 :--
Our invention has for its object to automatically feed a tapering mandril through
the body of the expander to effect expansion of the tube, and to automatically
withdraw the mandril to avoid forcible extraction should the expander stick in the
tube after expansion has been effected. Also, to adapt the expander to suit tubes of
different sizes by the use of a larger or smaller mandril.
Our invention consists in a tube expander having swage rollers in longitudinal
or more of said
slots in the body or stock surrounding a tapering mandril, one
rollers rotating obliquely to the axis of the mandril, whereby the oblique roller or
rollers will automatically by frictional contact, feed the mandril endwise during its
axial rotation to expand the tube, and after expansion of the tube, a reverse rotation
of the mandril will release the expander, automatically.
Our invention further consists of a tube expander having a body or stock
comprising three or more longitudinal sections converging radially, and connected
by equiangular arranged bars, to expand the sections radially apart, each of said
sections having a swage roller in a longitudinal slot, one or more of said rollers
rotating obliquely to the axis of a tapering mandril surrounded by the sections and
in contact with the rollers, so that by the use of different sized mandrils, the expander
will be adapted to suit larger or smaller tubes, as hereinafter set forth.
Figure 1, is a longitudinal elevation of our improved tube expander.
Figure 2, is an elevation of the end at the left hand of Figure 1, the central
mandril being omitted to clearly show the surrounding parts.
Figure 3, is an elevation of the end at the right hand of Figure 1, the mandril
omitted.
Figure 4, is a section on line xx figure 1, and
Figure 5, is a perspective view of one of the sections composing the body of the

page_text: A, is a tapering mandril inserted in the cylindrical and tubular body or stock of the
expander, and said body comprises three or more longitudinal sections converging
radially, each section having a radial slot obliquely to the longitudinal axis of the
mandril and the opposite sides of the slots are hollowed out longitudinally, or if
desired, some of the slots may be parallel to the axis of the mandril. The
sections B, B1, B2, at the outer end have a flange a which returns to about midway
over the length of the slot, and circumferentially, at a suitable distance therefrom.
When the expander is in the tube, the end of the flange bears against the tube sheet,
and the end of the tube extends under the flange, in the usual manner.
C, is a roller inserted in the slots of the sections through a tubular entrance b,
at the outer end. The rollers bear frictionally in the slots and have frictional
contact with the mandril, and one or more of said rollers have an axial rotation
oblique to the axis of the mandril, so that when the mandril is rotated by the usual
lever c, the oblique roller or rollers will automatically draw the mandril end wise into
the stock or body of the expander, and cause the sections B. B1, B2, to be forced
out, whereby they separate radially to cause the rollers to expand the tube. After
expansion of the tube, a reverse rotation of the mandril will cause the oblique rollers
to automatically draw out the mandril, and thereby avoid liability of sticking in the
tube and injury by violent abstraction.
The sections B, B1, B2, are connected to expand radially apart by equiangular
arranged bars D. D1, D2, one end of each bar inserted in a hole in each section
respectively, and fastened by a pinching screw d, and the other end passes through a
hole in the next section, so that the sections will slide on the bars and separate
uniformly in a radial-direction to accommodate the size of the tube to be expanded
by the use of a larger or smaller mandril.
The bars D, D1, D2, cross the outer end of the rollers and prevent the rollers
escaping endwise from the slots in which they frictionally rotate.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is,
•
1. The combination, with the tapering mandril A, of a surrounding body or stock
having a flange a, and provided with horizontal slots carrying rollers C, one or more
of said rollers rotating obliquely to the axis of the mandril, whereby the mandril
is automatically fed into the stock, to effect expansion of the tube, as set forth.
2. In a tube expander, the combination, with the tapering mandril A, of radially
separating sections B, B1, B2, provided with a slot carrying a rollers C, one or more
of said rollers rotating obliquely to the axis of the mandril, and the sections
connected by equiangular arranged bars D, D1, D2, as set forth.
3. A tube expander, comprising a mandril A, surrounded by a body or stock
composed of three or more radial-converging longitudinal sections B, B1, B³, each
provided with a slot carrying a roller C, and connected by equiangular arranged
bars D, D', D2, substantially as set forth.
Dated this Nineteenth day of December A.D. 1888.