Year: 1897

page_text: We, WILLIAM PILKINGTON and ARTHUR PILKINGTON, Engineers, both of
Catherine Street, Aston, in the County of Warwick, do hereby declare the nature
of this invention to be as follows:-
Our invention relates to segmental stretching rolls of the kind used in drawing
out tubes from a hot billet on a mandrel.
In constructing such rolls according to present practice the segmental grooved
part of the roll, that is, the rolling or operating part, is formed in one piece
with the main body of the roll, having bearings and driving connections all com-
plete. We have found that this part is very rapidly worn out, and that special
steel is required for the rolling part.
Our invention consists in constructing the rolling or operating segment separately
from the roller shaft and its collars and connections in order to permit it to be
removed and replaced by a fresh segment with great rapidity and ease.
Our invention further consists in a special method of connecting and discon-
necting this roller segment.
In carrying our invention into effect we construct a steel segment suitably
grooved and shaped. This segment may be a semi-circle, and on its interior
surface we fix a strong key or feather. This key or feather drops into a slot, or
key-way in the roll shaft, situated in a strong piece between two heavy flanges.
Both flanges are undercut, so that the space between the flanges is greater next
the shaft than at the outer edges. A screw or incline groove is formed on one
of the undercut surfaces, and a segment washer is made with a projecting rib to
fit this groove.
The steel roll segment has its opposite surfaces turned, one surface to fit one
of the under cut surfaces, and the other to fit the segment washer which in contact
with the other under cut surface locks the steel segment roll in position. The
segment washer is of sufficient thickness to allow the segment roll to be removed
from between the dovetail surfaces of the washers when it is taken out. The
washer thus leaves a sufficient space between the collar and the segment piece.
The segment collar is formed with inclined or screw surfaces to act on similar
surfaces on the washer, and when it is turned round the shaft, in the correct
direction, it locks the operating segment piece between the two collars, and holds
it strongly in position. The direction of turning this collar skew surface or skew
surface piece is such that when the rolls are operating the tendency of the strained
part is to further lock the screw or collar in position. By this device we are
enabled to manufacture rolls with separable segment operating pieces which can
be readily taken out and replaced when worn. At the same time we securely
hold them in position while the tube rolling is proceeding.

page_text: The precise arrangement of the locking washer here described may be varied
without departing from the invention.
Dated this 10th day of June 1897.
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
3, Temple Street, Birmingham, Agents for the Applicants.
Improvements in Segmental Rolls for Rolling Metals.
We, WILLIAM PILKINGTON and ARTHUR PILKINGTON, Engineers, both of
Catherine Street, Aston, in the County of Warwick, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be parti-
cularly described and ascertained in and by the following statement:-
This invention relates to segmental stretching rolls of the kind used in drawing
out tubes from a hot billet on a mandril. In constructing such rolls according
to present practice the segmental grooved part of the roll, that is the rolling or
operating part, is formed in one piece with the main body of the roll having
bearings and driving connections all complete. This segmental part is very
rapidly worn out, and as it is in one with the main body, and is constructed of
special steel, it is awkward and expensive to replace.
The invention consists generally in constructing the rolling or operating seg-
ment separately from the roller shaft and its collars and connections in order
to permit it to be removed and replaced by a fresh segment rapidly and easily,
and the invention further consists in special devices for connecting and dis-
connecting this roller segment.
The means for carrying the invention into effect are illustrated in the accom-
panying sheet of drawings, as follows:-
Figures 1 and 2 are respectively side elevation partly in section and end eleva-
tion of the roll shaft with the segmental roll locked in position.
Figures 3 and 4 are respectively elevation and plan of the segmental roll
detached from the roll shaft.
Figures 5 and 6 are respectively elevation and plan of a locking segmental
washer also detached from the roll shaft.
The roll shaft A is increased in diameter at B and an undercut dovetail groove
turned therein thus forming two flanges of great strength between which the
segmental roller C is locked. The steel segmental roll C (which is preferably semi-
circular in extent) has its exterior surface framed with a rolling groove D of the
required dimensions while its inner surface has a key or feather way E which
embraces when the segment is placed in position a key or feather rigidly attached
to the roll shaft A. This segment C has its opposite surfaces a and b turned,
one surface a to fit the left hand undercut sides of the groove, while the other
surface b is turned to form portion of a helix and fit against one side of the locking
segmental washer F when both are in situ.
The segmental washer F is also semicircular in extent with a cross section
formed as clearly shown in Figure 1, and with its surface c opposite its helical
surface 6 fitting against the right hand side of the under cut groove. Further,
a projecting rib d is formed integral with the segmental washer F on its right
hand side and arranged with its surface formed helically or like a wedge and
projecting into a corresponding groove in the adjacent wall or flange.
The segmental roll C is first placed in position in the undercut groove and

page_text: embraces the key or feather fixed at the bottom thereof, the space left by_the
absence of the washer F permitting this adjustment. The segmental washer F is
next placed in the groove on the other side thereof and rotated round in the
correct direction into its place, the helical surfaces on b and d coming together and
rigidly binding the segmental roll in position. These binding helical skew or
wedge surfaces are so arranged relatively to the rotation of the roll shaft when in
operation that the tendency of the strain is to further lock or screw the roll C and
washer F in position.
By the devices herein before described roll shafts are arranged with detachable
segment operating pieces, the said segments being readily removed and replaced
when worn and further immovably held in position when the tube rolling is
proceeding.
It is to be clearly understood that the precise arrangement of the locking washer
may be considerably varied, as for example the helical surfaces may be formed on
the right hand side of the undercut groove and the adjacent surface of the locking
washer and all without departing from the subject of the present invention.
Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is: -
1. In segmental rolls for rolling metals providing the roll shaft with a detach-
able segmental roll locked in position in an undercut or dovetail groove formed in
a thickened portion of the roll shaft by a segmental washer provided with helical
surfaces, substantially as hereinbefore described.
2. The improved detachable segmental roll and locking washer herein before
described with reference to the accompanying drawings.
711 1
1 1000
MARKS & CLERK,
18, Southampton Buildings, London, W.C., and
13, Temple Street, Birmingham, Agents for the Applicants.