Improvements in Machinery for Straightening and Tempering Circular Saw Plates and other like Plates.
Year: 1888

page_text: Improvements in Machinery for Straightening and Tempering
Circular Saw Plates and other like Plates.
I, WILLIAM HUGINN WALKER of Wicker Iron Works, Sheffield in the County of
York Engineer do hereby declare the nature of this invention to be as follows:-
The object of my invention is to produce a. machine that will more effectively carry
out the operations of straightening and tempering Saw plates and other like plates
(commonly called "Goffing") than machinery as hitherto constructed.
In constructing a machine according to my invention I make a base plate of
suitable diameter for the size of the required circular plates or saws with two or more
projecting side lugs, and a corresponding top plate or cross head having similar lugs,
and I connect the two at a suitable distance apart, by strong rods or columns.
Between the base plate and the crosshead I arrange an adjustable die block, its face
corresponding with the face of the, base plate, and capable of sliding longitudinally
upon the before mentioned columns; through an opening in the centre of the cross-
head I fit the boss of a worm wheel, and secure it in position by means of a loose
collar or other equivalent means in such a manner that it can be readily revolved by
means of a corresponding worin carried by the crosshead and actuated either by hand
other motive power.
Through the centre of the worm wheel and its boss I form a screw threaded hole,
through which I pass a strong screw, having its lower end secured to the centre of the
die block thus when the worm is turned round it will cause the worm wheel to revolve
and the screw and die block to travel up or down as the case may be, thus opening or
closing the space between the faces of the said die block and base plate. I form upon
the top of the die block a number of radiating ribs, and I provide the face of the said
die block with a number of radial grooves for the purpose of allowing a free passage
for heat I also form through the centre of the base plate a conical opening for the
passage of heated gases from the furnace to the space between the faces of the base
plate and the die block and I arrange that this opening may be closed by a stopper or
other contrivance when desired, around the periphery of the circular face of the base

page_text: plate I place a guard ring, which may be raised so as to enclose the space between the
faces of the base plate and the die block, for the purpose of protecting the edges of the
saw plates from the action of the fire and thereby retaining the equal temper of the
steel plates. This raising action may be accomplished by turning the guard ring
round, and causing it to ascend a series of inclines formed on the base plate. I prefor
to fix the said machine centrally over a furnace opening and enclose its lower portion
in a chamber having a movable cover plate-and a side door to admit the plates.
The chief object in constructing the machine as above described is to obtain
regularity of heat throughout the pressing parts of the said machine, both before and
during its operation, so as to retain an equal temper throughout in the saw plates or
other plates operated upon.
5011
1000
ROBT. F. DRURY, Fel. Inst. P.A.,
Bank Buildings, George Street, Sheffield,
Agent for Applicant.

page_text: Circular Saw Plates and other like Plates.
I, WILLIAM HUGINN WALKER of Wicker Iron Works, Sheffield in the County of
York, Engineer 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 :-
The object of this invention is to produce a machine that will more effectively carry out
or perform the operations of straightening and tempering saw plates and other like
plates (such process being commonly known in the trade as goffing) than can be
performed by the machinery as hitherto constructed.
In order that my invention may be clearly understood I annex a sheet of Drawings
which illustrate a machine constructed according to my invention.
Fig. 1, represents an elevation of a machine with the upper front part of the
casing removed.
Fig. 2, Plan of the top plate.
Fig. 3, Underside or face of the top plate.
In constructing a machine according to my invention, and as illustrated in the
drawings, I make a base plate A, with a true facing on its upper side, of a size
suited to the largest diameter of the plates intended to be operated upon, and
provided with a central opening (a) preferably conical (for the passage of heat) and
having also side lugs to receive the bottom ends of three (or other number of)
strong rods or columns B, which are secured at their top ends by a strong crosshead
or top plate C.
"
Between the base plate A, and the top plate C, I arrange a movable die block D,
having also a true facing on its underside, corresponding in diameter to that of the base
plate A. This die block is also shown in Figs. 2 & 3-and it is arranged to slide
vertically between the guide rods or columns B. It is operated by means of a screw E,
secured to it in the centre of its top side, and passing through the threaded boss of
a worm-wheel F, which fits into, and is capable of revolving in the crosshead or
Topplate C, being held in position by the collar G.
The worm wheel is caused to revolve by a worm H, which may be turned by
hand or by power; by these means the die block D, may be raised from, or lowered
upon, and powerfully forced against the face of the base plate A.
The face of the die block Ď, shown in Fig. 3, is provided with radial grooves J,
all running into a central recess K, of equal depth, or the grooves may be arranged
in various other ways to form channels for the heat, or products of combustion, to
be conveyed from the centre to the outside, and I return or continue the grooves
up the edge of the die block to enable the heat to obtain free access to the top side,
so as to heat the die block equally all over.
I may or may not forin a chamber L, close above the top side, by a cover plate M,
having an opening in the centre into the space N, from which the products of com-
bustion escape through the flue O. I may also use when it is desirable, a circular
tyre shaped guard ring, that may be raised and lowered so as to reveal, or to close

page_text: up the space between the face of the die block, and that of the base, so as to protect
the edges of the plates when they are being operated upon, from the action of the
fire; and to enable this to be done easily I cast or otherwise form on the top of the
die block, a number of inclines P, on which the said guard-ring rests, thus when
the guard-ring is turned in one direction it travels up the inclines and is raised, and
vice versa.
The machine so constructed, I place in a furnace, such as is shown in the drawing;
the fire being underneath the base plate, and I close in the top by a plate or cover Q,
so that the worm and worm wheel are outside.
The furnace is provided with a suitable door through which the plates may be
passed into the machine, and below this is the firing door shown in the drawing.
I may however for some purposes heat the base plate and the die block by Hot-
water, or steam, passed through circulating passages constructed in the said parts.
In tempering Steel plates already hardened, the base plate A and the top plate D
are brought to the required degree of heat; the hardened plates are then placed
between them, and while becoming hot are gradually compressed by the action of
the sorew; when the plates have arrived at the desired heat and are pressed flat they
are taken out of the press and are allowed to cool gradually.
The chief object of this method of construction, as above described; is to obtain
regularity of heat throughout the pressing parts of the Apparatus, both before and
during its operation, so as to retain a suitable temper throughout in the saw plates, or
other plates operated upon.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that
what I claim is :—
1-A machine for the purpose specified, constructed substantially as hereinbefore
described, and shown in the drawings.
2-The general construction and arrangement of a combined pressing Machine, and
Furnace, as hereinbefore described and illustrated.
3-In a Machine for straightening and tempering plates, as herein specified, the
combination of a base plate A, having a central heat passage, with a corresponding
die block B, provided with heat conducting passages from its centre to its periphery,
substantially as hereinbefore described and shown.
Dated the 28th day of December 1888.