AN IMPROVEMENT IN MACHINERY FOR BENDING METAL PLATES INTO TUBULAR FORM
Year: 1876

page_text: LETTERS PATENT to Stephen Paschall Morris Tasker, of the City and County
of Philadelphia, in the State of Pennsylvania, United States of America,
for the Invention of "AN IMPROVEMENT IN MACHINERY FOR BENDING
METAL PLATES INTO TUBULAR FORM."
Sealed the 9th June 1876, and dated the 20th April 1876.
COMPLETE SPECIFICATION filed by the said Stephen Paschall (Morris Tasker
at the Office of the Commissioners of Patents on the 20th April 1876.
STEPHEN PASCHALL MORRIS TASKER, of the City and County of Philadelphia,
in the State of Pennsylvania, United States of America. "AN IMPROVEMENT IN
MACHINERY FOR BENDING METAL PLATES INTO TUBULAR FORM."
The nature of my Invention consists in the first place in the combination of a
revolving tapered mandrel, with three or more bending rolls which revolve in
opposite directions from the movement of the mandrel, whereby they gradually
bring the plate to be bent into a cylindrical form as it passes from the large end of
the mandrel to its small end. These rolls are so set as to leave a space between
them and the mandrel equal to the thickness of the plate. And they may be either
of cylindrical or tapered form; yet I prefer the tapered form and arrange their
large ends with the small end of the mandrel so as to have their journals parallel
with the journals of the mandrel.
The Invention, in the second place place, consists in the combination of a revolving
bed and a pair of feed rolls with the mandrel and the bending rolls for feeding the
plate to said rolls, the feeding rolls being connected with the bed and turning with
it as herein-after described.
The bed, the feed rolls, and the bending rolls are revolved by any suitable
mechanism.
In the accompanying Drawings which make a part of this Specification,
Figure 1 is a plan view of my improved machine; Figure 2 is a vertical longi-
tudinal section at the line x, x, of Figure 1; Figure 3 is a front elevation of the
machine.
Figure 4 represents an end view of a butt joint.
Figure 5 represents an end view of a lap joint.
Figure 6 represents one end of the mandrel having a recess for bending the lap
joint.
Like letters of reference in all the Figures indicate the same parts.

page_text: The several parts of my machine are supported by any suitable framework. In
the Drawing A represents the bed plate which has housings B, B, B, B; C is a
revolving bed, from one end of which projects the tapered mandrel D; they are
supported by the housings B; E, E, E, are bending rolls of the same taper as that
of the mandrel, whereby, when they are so arranged as to leave the requisite space
between them and the mandrel for the passage of the plate to be bent their journals
are in parallel planes whereby to adapt the rolls to spur gearing. In the front
end of the revolving bed C are placed a pair of feed rolls G, G, for feeding the
plate to the bending rolls, there being a mouth a in the end of the bed in front of
these rolls. A channel b, which is seen in Figures 1 and 2, extends from the feed
rolls to the mandrel for the passage of the plate, the channel being of the same
width as the mouth a.
The operation is as follows:-The plate to be bent being entered between the
feed rolls G, G, and the bed C, mandrel D, and bending rolls E, E, E, being revolved
in the directions of the arrows by any suitable gearing, and the feed rolls being
carried around with the bed the plate is carried forward through the channel b,
and as it passes between the mandrel and the bending rolls it is gradually brought
into a cylindrical form until it passes from between them at the small end of the
mandrel, and either a butt joint as in Figure 4, or a lap joint as in Figure 5, is
formed by the finishing process of the bending operation.
When the machine is intended to make lap joints it is necessary to have a
longitudinal groove extending from the small end of the mandrel D a few inches,
ns seen in Figure 6, so that one side of the lap can be depressed while the other
side is pressed on it by the bending rolls.
I do not confine myself to the use of three bending rolls, as it will appear that a
greater number may be advantageously used, nor do I confine myself to the use
of the tapered bending rolls in combination with the tapered mandrel, as cylindrical
rolls when so arranged as to have an equal space between their peripheries and the
mandrel throughout their whole length will produce a similar result.
What I claim as new and desire to secure by Letters Patent is,-
First. The revolving bed C, having a mouth a and channel b for the passage of
a plate to be bent in combination with the tapered mandrel D, substantially in the
manner and for the purpose set forth.
Second. The combination of three or more bending rolls with the tapered
mandrel D for the gradual bending of the plate into cylindrical form, substantially
as described.
Third. The combination of the feed rolls G, G, with the revolving bed C, having
a channel b for feeding the plate to the bending rolls, substantially as set forth.
In witness whereof, I, the said Stephen Paschall Morris Tasker, have here-
unto set my hand and seal, this Third day of April, in the year of our Lord
One thousand eight hundred and seventy-six.
STEPHEN PASCHALL MORRIS TASKER. (L.S.)