IMPROVEMENTS IN MACHINERY OR APPARATUS FOR BENDING METALLIC PLATES"
Year: 1882

page_text: LETTERS PATENT to Charles Scriven of the Leeds Old Foundry, Leeds, in the
County of York, Engineer for an Invention of "IMPROVEMENTS IN MACHINERY
OR APPARATUS FOR BENDING METALLIC PLATES"
PROVISIONAL SPECIFICATION left by the said Charles Scriven at the Office
of the Commissioners of Patents on the 7th December 1882.
CHARLES SCRIVEN, of the Leeds Old Foundry, Leeds, in the County of York,
Engineer, "IMPROVEMENTS IN MACHINERY OR APPARATUS FOR BENDING METALLIC
PLATES,
This invention relates to machines for bending to the desired form metallic
plates to be used in the construction of steam boilers, tubes, and for ships and
other objects.
When a plate has been once passed through an ordinary three-roll machine to
be bent to the form of a tube or part of a tube, that part of the plate that last
passed between the rolls, which for distinction I will call the rear portion of the
plate, is generally found to be in an unbent state or practically so, and consequently
in order to bend such rear portion to the same or to an approximate and continuous
curve with the rest of the plate, it is usual to pass the plate through the machine
a second time, commencing with that which was the rear edge during the first
passage through the machine.
Now according to my invention, with a view to obviate the inconvenience
above referred to, and to enable the bending of a plate to be effected entirely in one
operation, I employ a machine constructed with an arrangement of four rolls, one
or both of which is or are suitably driven, the other two are bending rolls, arranged
respectively at opposite sides of the said main rolls, and able to be by suitable
mechanism provided for the purpose, moved either simultaneously or separately as
preferred. By such use of two bending rolls in conjunction with two main rolls
ID

page_text: as above described, I am enabled to bend a plate throughout its length without
having recourse to a second operation such as above referred to.
The machine is so arranged that the motion of the rolls can be reversed as
desired. Also provision is made whereby when a plate has thus been bent into
the form of a complete tube, or nearly so, the main roll around which it is wrapped,
can be removed and the tube released.
My improved bending machine may be arranged with the axes of the rolls
either vertical, horizontal or in an angular position, I prefer the vertical position
as being the most convenient, the bed plate of the machine being provided, with
rollers or their equivalent, for receiving the plate, thus forming a guide for leading
it correctly into the "bight" of the main rolls.-The withdrawal of the roll around
which a plate becomes wrapped in the process of bending, is more readily effected
vertically than otherwise.

page_text: J
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Charles Scriven in the Great Seal Patent Office on the 4th June
1883.
CHARLES SCRIVEN, of the Leeds Old Foundry, Leeds, in the County of York,
Engineer, " IMPROVEMENTS IN MACHINERY OR APPARATUS FOR BENDING METALLIC
PLATES
"
This Invention relates to machines for bending to the desired form, metallic
plates to be used in the construction of steam boilers, tubes, and for ships and
other objects.
When a plate has been once passed through an ordinary three roll machine to be
bent to the form of a tube or part of a tube, that part of the plate that last passed
between the rolls, which for distinction I will call the rear portion of the plate, is
generally found to be in an unbent state or practically so, and consequently in
order to bend such rear portion to the same or to an approximate and continuous
curve with the rest of the plate, it is usual to pass the plate through the machine
a second time, commencing with that which was the rear edge during the first
passage through the machine. Now according to my invention, with a view to
obviate the inconvenience above referred to, and to enable the bending of a plate
to be effected entirely in one operation, I employ a machine constructed with an
arrangement of four rolls, two of which are main or gripping rolls, one or both of
which is, or are suitably driven, but I prefer to drive only one, which is in a fixed
position, the other being by suitable mechanism caused to approach the said driven
roll and to grip and draw the plate under treatment through the machine. The
other two are bending rolls arranged respectively at opposite sides of the main
driven or gripping rolls, and able to be by suitable mechanism provided for the
purpose, moved either simultaneously or separately as preferred. By such use of
two bending rolls in conjunction with two main rolls as above described I am
enabled to bend a plate throughout its length without having recourse to a second.
operation such as above referred to.
The machine is so arranged that the motion of the rolls can be reversed as
desired.
Also provision is made whereby when a plate has thus been bent into the form
of a tube or nearly so, the main roll around which it is wrapped can be removed
and the complete or nearly complete tube released. My improved bending machine
may be arranged with the axes of the rolls either vertical, horizontal, or at an
angle, I prefer the vertical position as being the most convenient, the bed plate of the
machine being provided with rollers or their equivalent for receiving the plate, thus
forming a guide for leading it correctly into the "bight" of the main or gripping
rolls. The withdrawal of the roll around which a plate becomes wrapped in the
process of bending is more readily effected vertically than otherwise. A machine
according to my invention for bending metallic plates is illustrated in the accom-
panying two sheets of drawings, similar letters representing similar parts wherever
they occur. Fig. 1. is a side elevation. Fig. 2. a front elevation. Fig. 3. a plan,
and Fig. 4. a sectional plan on the line 1. 1 of Figs, 1, and 2.-A, is the
foundation plate, B, B, B, B are four supports fixed thereon, and which carry the
lower housing, bedplate or frame C, on which are mounted pillars D, D, D, D, for
carrying the upper and corresponding housing E,-The rolls are mounted in these
housings or frames.-The main driven roll L, in addition to its two bearings in the
housings C, and E, has a foot-step bearing on the foundation plate A, at L 1.—

page_text: F, is the driving pulley, keyed on the first motion shaft F 1,-G, and G 1, are loose
pulleys for carrying open and crossed straps which are employed for imparting a
forward and backward motion to the main roll L, and also to the other main
roll M, when the said rolls L, and M, are geared together. H, is the first motion
bevil pinion on the shaft F 1, it takes into the bevil wheel I, on the second motion
shaft I 1, on which is the spur pinion J, which takes into the spur wheel K, on the
axle of the main roll L, M, is the corresponding main or gripping roll having
movable bearings N, and N, 1, in the housings C, and E, respectively, this latter
roll M, is caused to approach the first named main driven roll L, by means of the
Ecrews O and 01, so as to grip and pass a plate under treatment through the
machine. P, and P 1, are the bending rolls placed one at each side of the main or
gripping rolls L, and M, and furnished (in a similar manner to the roll M,) with
sliding bearings P2, P3, P4, and P 5, in the housings C, and E.-These bearings
are actuated automatically (simultaneously or otherwise as desired) in either
direction from the second motion shaft 11, by means of the clutch Q, which is
caused to take alternately into corresponding clutches in the bevil gearing R,
and R 1, by movement of the lever S-The bevil gears R, and R 1, alternately
drive in contrary directions as may be required, the pinion R 2, on the shaft T, as
also the worm R 3, and clutch R 4.-The latter engages with a clutch R 5, which
is on and drives the wheel R..G, this latter being mounted loosely on the shaft T,
between collars which prevent its endwise motion thereon.-The shaft T, terminates
at or near the outermost collar, and next to another shaft U, which is in line
therewith, and carries the worm R7, and also the clutch R 8, for engaging with a
clutch R9, on, and receiving motion from the said wheel R. 6.-The worms R 3,
and R 7, take into and drive the tangent wheels $ 1, and S2, each having internal
screw threads for taking on to the screws V, and V 1, in connection with the lower
movable bearings P 2, and P 4, of the two bending rolls P, and P 1, Motion is
communicated to the upper movable bearings of said bending rolls simultaneously
with their lower bearings just referred to, through the gearing R 6, R 10, vertical
shaft R 11, gearing R 12, and R 13, and an arrangement of clutches S 3, and S4,
worms S 5, and S6, tangent wheels S7, and S8, and screws V 2, and V 4, similar
to those described above with reference to the movement of the lower bearings of
said bending rolls P, and P 1.-In cases where it is desirable that only one bending
roll should be automatically employed, I use the roll P, and disengage the other by
withdrawing the clutches RS, and S 4, thus leaving the roll P 1, in a stationary
position, it being moved back out of the way of a plate under operation.
In addition to moving the aforesaid bending rolls automatically, they are also
capable of being moved by hand, by means of the hand wheel S 9, on the vertical
shaft R 11, in which.case I place the clutch Q, in its neutral position, so as to leave
the wheels R, and R1,. free to turn on their axes by the action of the pinion R 2.-
I then engage the clutches R-4, R 8, S3, and S4, then by turning the hand
wheel S 9, the bending rolls P, and P 1, are caused to move simultaneously to and
fro, corresponding with the way in which the hand wheel is turned.
By the said hand motion, either of the bending rolls P, or P 1, may be brought
into action and the other remain idle, by the manipulation of the clutches. R.4,
and S 3, or R 8, and S4, as desired.-These clutches are moved in pairs by an
arrangement of mechanism not shewn in the drawings.-W, W, are guide rollers in
the lower housing C, to assist in leading a plate to be operated upon correctly into
the "bight" of the main rolls, and are so arranged that as the plate becomes bent
they follow the curvature thereof, they are also made to swivel. so that their axes
of motion are in a radial line to the centre of such curvature and continue to
support the plate until the bending is completed.-Fig. 5, shews a section of the
housing, C, at line 2. 2, with one of the guide rollers W, in elevation.-Z is a plate
under operation.
Having now described the nature of the said Invention and the manner of
carrying the same into practical effect, I would have it understood that what: I

page_text: consider to be novel and original and therefore claim as secured to me by the
Letters Patent herein before first in part recited is
1, In a machine of the kind, hereinabove referred to, for bending metallic plates,
the use in conjunction with two main or gripping rolls, of two bending rolls so
arranged in relation to the said main or gripping rolls; that a plate may be bent
throughout its length or breadth at one operation, substantially as hereinabove
described.
2. The improved plate bending machine with two main or gripping rolls and
two bending rolls, the whole constructed, arranged and operating, substantially as
described and illustrated.
In Witness whereof, I, the said Charles Scriven have hereunto set my hand
and seal this second day of June, in the year of our Lord One thousand
eight hundred and eighty three.
Witness to the signature of
the said Charles Scriven,
THO E CRAVEN C.E.
Fel. Inst. Patent Agents,
24 Victoria Chambers,
South Parade
Leeds.
CHAS SCRIVEN (L.S.)