Improvements in or relating to Grinding-machines, which are advantageously applicable to the Trueing and Facing of Metal Articles.
Year: 1895

page_text: Date of Application, 26th June, 1895
Complete Specification Left, 16th Mar., 1896-Accepted, 16th May, 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Grinding-machines, which are
advantageously applicable to the Trueing and Facing of
Metal Articles.
We, JOHN HENRY ROYLE TASKER and FREDERICK TASKER, trading as
Tasker Sons & Company, of Sheaf Street, Sheffield, in the County of York,
Engineers, do hereby declare the nature of this invention to be as follows:-
-
Our invention relates to improvements in grinding machines which are advan-
tageously applicable to the trueing and facing of metal articles such as flat metal
bars.
According to our invention we construct a machine having a headstock carrying
a spindle in preferably ordinary bearings, the front end of which spindle carries
a grinding disc or other grinding tool. The spindle is driven either by pulleys
and belts or by a pulley and friction clutch or by electric motor or otherwise.
The headstock is made so that it can be raised or lowered and adjusted at any
suitable angle together with the disc and spindle either by worm gearing and
a rack or sector or by other mechanical devices and any desired means may be
employed for locking the headstock after it has been adjusted at the required
angle. Again another method we employ for raising or lowering the spindle
to which the disc is attached is by constructing a headstock with bearings
carried in cradles the front cradle having trunnions to either one
which we attach worm gearing or other means which will rock or
grinding disc to any suitable angle; the back cradle follows the spindle and
when at the required angle can be locked either by set screws studs or other
suitable means; we may also use screws or levers for raising, lowering or
rocking the spindle instead of using worm gearing as before described and
we may employ as driving gear belts and fast-and-loose pulleys on the spindle
or we may adopt fixed pulleys on the spindle with a friction clutch or
electric motor, in case the angle should be so great as to make it inconvenient
to use belts
or both of
move the
au
The spindle may be made axially adjustable either relatively to the headstock or
by moving the headstock in guides.
Dated this 26th day of June 1895.
BOULT & WADE,
Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in or relating to Grinding-machines, which are
advantageously applicable to the Trueing and Facing of
Metal Articles.
We, JOHN HENRY ROYLE TASKER and FREDERICK TASKER of Sheaf Street,
Sheffield in the County of York, Engineers, 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 :-
Our invention relates to improvements in grinding machines which are

page_text: advantageously applicable to the trueing and facing of metal articles such as flat
metal bars.
In the accompanying drawings
Figure 1 is an end elevation of one construction according to this invention of
an improved grinding machine actuated by an electric motor.
Figure 2 is a view of the same in a position at right angles to that in which it is
shown in Fig. 1.
Figure 3 is a side elevation of another construction of our improved grinding
machine adapted to be actuated by a belt.
Figure 4 is an end elevation of this alternative construction.
With reference first to Figs. 1 and 2 A is a bed having a table B hinged to
it at B and having V's B similar to those on an ordinary lathe bed. On this
table is a travelling carriage C and on this carriage is a swivelling headstock D
supporting an electric motor E. In the bearings F of the headstock D is the
spindle G which carries the armature E' of the motor and also the grinding
disc H. The table B pivoted at B' has pins or screws B³ fixed in it which
pass through slots A' in the slotted arcs A' fixed to the bed B; the table can
be raised to any desired angle within the limit of the slots A³ and there fixed
by the screws B³ carrying with it the travelling carriage C which can reciprocate
on the bed A, headstock D, electric motor E and spindle G all together so that
according to the angle the table B makes with the horizontal the grinding disc H
will make a like angle with the vertical. One of the arcs A' is fixed at
each side of the bed A as shown in Fig. 1. On the bed A is pivoted a hand-
wheel A controlling a pinion A, the latter gearing into a spur-wheel A° connected
to one end of a spindle A, the other end of which is held in brackets A' in
the bed. Between the brackets A' is a worm A fixed on the spindle AⓇ and
gearing into a worm wheel A' which is fixed on the spindle A10 journalled in
the bed. On the spindle A are placed two pinions "A" gearing into curved
toothed racks A which are fastened by bolts or studs to the underside of the
table B, so that by turning the hand-wheel A' motion about the pivot B₁ is
given by the wheels A'A and racks A¹ to the table and it can be raised or
lowered as desired.
On the table B is a wheel J with spindle J' carrying a worn Js and gearing
into a worm wheel J³, which is fixed on the feed screw J engaging with the
carriage C so that by turning the spindle J the travelling carriage C is moved
on the bed A forwards or backwards from the wheel J which allows the disc H
to be moved up to or away from its work. On the travelling carriage C is a
wheel C which turns on a stud C and carries a chain pinion C and on the
same carriage are brackets C which carry a worm C and spindle C; on that
spindle is placed a larger chain wheel C and on the base of the headstock D
is a rack D¹ Fig. 1 which is operated by the worm C' to swivel the headstock
and everything carried by it. In the centre of the headstock D is a swivel
pin D which is fastened to the travelling carriage C by lock nuts while the
headstock D is allowed to move on this swivel pin being an easy fit thereon.
The chain pinion C³ communicating by the chain C with the chain wheel C
turns the worm C which operates on the rack D¹ so that by moving the
wheel C the headstock and disc H can be swivelled to either one side or the
other at any suitable angle. Thus the disc H can be raised or lowered and
set any suitable angle within limits, in the vertical plane or swivelled horizontally
to the desired angle in the horizontal plane.
Means other than those herein before described by way of example may be
employed for the adjustinent of the table B, carriage C and headstock D on their
respective supports.
Another construction of improved grinding machine is shown in Figs. 3 and 4
wherein the main spindle is vertically adjustable relatively to the upper portion of
the bed instead of the latter being adjustable vertically as in Figs. 1 and 2.
In Figs. 3 and 4 the bed A has V's upon it like an ordinary lathe bed and

page_text: on it is a travelling carriage C with a headstock D swivelled on it. The
headstock has cradles M1 and M2 carrying a bearing M³ and back bearings M*
with a spindle G supported in those bearings and carrying the grinding disc H ;
the front cradle M¹ or trunnioned bearing carries two trunnions M, one of these
trunnions seen in Fig. 3 being extended to take a quadrant or sector M which
is in gear with a worm M' on the spindle M³ held in brackets M and M10 and
is operated by the hand wheel M₁ so that by turning the hand wheel M",
which works the worm M' and quadrant or sector M° the cradle is angled into
any desired position within the range of the quadrant, carrying the spindle and
disc with it, the back cradle M' being elevated according to the angle desired.
The sides of the headstock D are slotted out at R, screws or studs at R¹
being fixed in the cradle M' and extended through the slots R so that by
means of nuts on those screws the cradle is fastened in the desired position and
also secured by set screws R' screwed through the headstock. In the bed A
is the ordinary traversing screw J* operated by the handle J which causes the
travelling carriage to travel forwards or backwards as desired. On the screw J*
is fixed a worm wheel J' and through the bed A is carried a spindle K with
hand wheel K₁ and worm K thereon which latter is adapted to gear with a
worm wheel J on the screw J*; the spindle is movable end wise so as to bring
the worm K into or out of gear with the worm-wheel J' as desired, and on
the bed at K is fixed a pin and pawl K so that the pawl can engage with
a groove in the spindle K when the worm wheel J and worm K² are in gear,
and prevent the spindle from moving endwise. At such times the carriage C
and disc H can be given a "fine" adjustment by the wheel K¹. By lifting up
the pawl K the worm spindle K is freed and the screw J' can be operated by
the handle K¹; thus either a quick or a more delicate adjustment can be
imparted as desired to the carriage C. On the travelling carriage C we fix
brackets C carrying a spindle C on which is a worm C and a spur wheel C'
which latter gears with a pinion C³ on the spindle C controlled by the handle C¹.
On the headstock D is fixed a rack D' with which the worm C³ gears and in
the centre of the headstock is a swivel pin D2 which fastens the headstock to
the travelling carriage C. By moving the handle C₁ the headstock can be
swivelled in the horizontal plane on the pin D, either one way or the other as
may be desired.
Motion is given to the spindle G by a belt pulley N; O is a friction clutch;
P is a bracket on which is pivotted a lever P¹, wheel P' and spindle P³ for
adjusting the friction clutch to engage the pulley N with the shaft G or disengage
it therefrom as desired.
We do not limit our invention to the particular devices hereinbefore described
for raising, lowering or swivelling the spindles of the grinding machines or for
bringing the work to the grinding disc or the disc to its work for we may effect
these adjustments manually or by any suitable mechanism without departing from
this invention. The work to be operated on may be placed parallel to the face of
the grinding machine on a carriage and bed and traversed across the disc auto-
matically or otherwise; or the machine may be arranged to traverse fixed work.
The motive power for working our improved grinding machines can be conveyed
by belts, rope gear, an electric motor or otherwise.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is ;-
1. A grinding machine in which is provided means for imparting angular
adjustment in a vertical plane to the grinding tool.
2. A grinding machine in which the grinding tool and devices for giving it
angular adjustment in a vertical plane are carried on a pivotted headstock such
as D substantially as and for the purpose described.
3. In a grinding machine the combination with a table such as B adapted to

page_text: receive angular adjustment in a vertical plane of a headstock such as D pivotted or
fixed to the table substantially as and for the purpose described.
4. In a grinding machine a shaft such as G which carries the grinding-tool H
and is supported in trunnioned bearings adjustable by worm gear or otherwise
substantially as and for the purpose described.
5. In a grinding machine the combination with the grinding-tool spindle G of an
electro-motor armature such as E' substantially as and for the purpose described.
6. The combination and arrangement of parts constituting a complete grinding-
machine substantially as and for the purpose described and illustrated in Figures 1
and 2 or Figures 3 and 4 of the accompanying drawings.
Dated this 14th day of March 1896.
JOHN HENRY ROYLE TASKER.
FREDERICK TASKER.
Boult & Wade,
Agents for the Applicants.