IMPROVEMENTS IN TUBE EYDANDEna
Year: 1880

page_text: LETTERS PATENT to Fredrick William Bond, of Lambeth, in the County
of Surrey, Boiler Maker, for an Invention of "IMPROVEMENTS IN TUBE
EYDANDEna"
PROVISIONAL SPECIFICATION left by the said Fredrick William Bond at
the Office of the Commissioners of Patents on the 7th September 1880.
FREDERICK WILLIAM BOND, of Lambeth, in the County of Surrey, Boiler-
maker. "IMPROVEMENTS IN TUBE EXPANDERS."
The improvements consist in making the expander proper cylindrical, or nearly
so, in cross section, of two or more segments or pieces, furnished with or without
grooves, said pieces being expanded or thrust outward from their common centre
by the introduction of a wedge-shaped mandril with or without grooves, or otherwise
formed, pushed into a cavity formed at and by the junction of said expander
pieces at a common centre; also in the use of guard slides or stops, preferably oue
on each segment, intended to butt against the tube at the tube plate. The object
of the Invention is to make an expander that will suit nearly every size tube.
The improvements are performed by making the various parts of metal, and
furnishing each segment of expander with one or more rollers for acting on the
surface of the tube to be expanded.
The expander pieces are held together by an annular spring which embraces
them, or they may be held in place by grooves fashioned in them made to fit into
dovetails or keys fashioned on the mandril.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Fredrick William Bond in the Great Seal Patent Office on
the 5th March 1881.
FREDERICK WILLIAM BOND, of Lambeth, in the County of Surrey, Boiler
Maker. "IMPROVEMENTS IN TUBE EXPANDERS."
My Invention consists in composing the body or roller bearing part of the tube
expander of two or more pieces joined together, in such a manner that the rollers
are thrust outward from the axis of the expander by the introduction of a conical
or wedge shaped mandrel, but prevented from shifting against each other in the
direction of their axis; also in the application of guard slides or stops, preferably 1
one on each of the pieces forming the body of the expander, intended to butt
against the end of the tube or the tube plate, and movable in the direction of the
axis by turning a screw spindle or by any equivalent device.
The accompanying Drawing illustrates two tube expandora embodying my
Invention, and serving to show some details of construction which may be adopted.1
for carrying the principles of my Invention into effect.
Figures 1, 2, 3, and 4 represent a tube expander constructed with two semi-
cylindrical halves and with conical mandrel.
Figure 1 being an end view.
Figures 2 and 4, two side views (on two perpendicular planes), and Figure 3, a 2
cross section through line A, B, of Figure 2.
B, B, are the semicylindrical pieces forming the body of the expander, covered
by plates G and united by a dovetailed slide C. Each half contains two rollers
F, F, and a guard slide or stop E provided with an internal screw thread, and
movable in a recess by turning the spindle D, which is secured with its neck in
the slotted slide C which guides the halves B, and gives room for the neck of the
spindle D when the halves B are thrust outward by introducing the mandrel A;
9, 9, are screws for securing the cover plates G.
Instead of introducing the mandrel from the side opposite to the rollers, as
shown, it may be introduced from the side of the rollers (which is afterwards 3
placed inside the tube) the thin end of the mandrel being provided with a screw
thread and a corresponding adjustable nut which rests on the back of the slide C,
while the thick end of the mandrel (that which is afterwards inside the tube)
forms a conical head which is drawn into the body of the expander in proportion
as the nut is tightened, thereby forcing the rolls outward.
Figures 5, 6, 7, and 8 illustrate a tube expander with flat mandrel A; Fig. 5
being an end view.
Figure 6, a side view.
Figure 7 a cross section through line C, D, of Figure 6, showing the two halves
closed together, while Figure 8 is another side view and a cross section through line 4
E, F, showing the expander opened; B, B, are the two adjustable halves connected
and guided in their relative motion by the pins C, C; F, F, are the rollers; G, G,
are cover plates, and D, D, spindles for adjusting the position of the guards E, E,
the necks of the spindles being secured to the body B, B, by cover plates and
screws g', g¹.
It will be seen that the same tube expander may be used for tubes of smaller
or greater diameter by thrusting the pieces B more or less apart; also that the
shape and number of the pieces B, B, as well as other details of construction may
be altered without departing from the nature of my Invention. The body of my
expander may, for instance, be held together by an elastic ring or coil instead of a
slide or pins.
What I claim is,-
1. A tube expander in which the body or roller carrying part is composed of

page_text: two or moro adjustable pieces joined together by a slide, pins, or equivalent devices,
so that the introduction of a conical or wedge shaped mandrel increases the diameter
of the expander to suit various diameters of tubes without altering the relative
position of the rollers in the direction of their axis, substantially as described.
2. In a tube expander the employment of adjustable guards or stops to rest
against the end of the tube or the tube plate when the expander is in operation,
substantially as described.
3. In a tube expander the combination of two separate roller carriers B with
rollers F, F, cover plates G, G, and a slido C or guide pins C, C, substantially as
described and illustrated.
4. In a tube expander the combination of roller carriers B, B, rollers F, cover
plates G, slotted slide plate C, adjustable stops E, and screw spindles D, substantially
as and for the purpose described.
In witness whereof, I, the said Fredrick William Bond, havo hereunto set
my hand and seal, this Fourth day of March, A.D. 1881.