Year: 1887

page_text: Date of Application, 16th Jan., 1887
Complete Left, 17th Oct., 1887
Complete Accepted, 18th Nov., 1887
I, RALPH PEACOCK of Gorton Foundry Manchester in the County of Lancaster
Engineer do hereby declare the nature of my Invention to be as follows:-
My Improvements relate to grinding machines by which round boles can be
enlarged and made true and by which circular or flat surfaces can be made true for
example after being drilled, worn irregular or case hardened.
The machine can be made according to my Invention either fixed or portable and
in the former case it consists of a firm bed or support upon which is mounted a head-
stock which may be adjustable and in which a sleeve is mounted so that it can be
revolved by means of a worm carried by the headstock engaging with a worm wheel fixed
to the sleeve or by any other suitable actuating device. In this sleeve there is mounted
a hollow spindle bored eccentrically to its external diameter. This spindle (which I
will call the outer hollow spindle) is keyed or connected to the sleeve so that it
revolves with it and it may also be moved axially or lengthwise by means of a cam
and lever or other means. In this outer hollow spindle there is another spindle also
bored eccentrically to its external diameter (which I will call the inner hollow spindle)
which can be secured by a nut or otherwise so that it revolves with the outer hollow
spindle in which (by a hand wheel fixed thereon or otherwise) it can be adjusted
eccentrically to give the requisite range of motion to the grinding spindle which
extends through the said inner hollow spindle and is driven by means of a pulley

page_text: fixed thereon or by any suitablo means independently of the means by which the
sleeve and hollow spindles are driven. The projecting end of the guiding spindle
carries the tool by which the grinding or like operation is effected and when the
apparatus is in operation the grinding tool is rotated on its own axis by the rotary
motion givon to the grinding spindle whilst it has the necessary revolving motion
through a circular path given to it by the mechanism which drives the sleeve and
eccentrically bored spindles the extent of this circular path being regulated by the
relative adjustment of the inner and outer hollow spindles.
There may be one or more headstocks and tools arranged as described carried by the
same plato or framing.
When the apparatus is to be portable the headstock carrying the sleeve hollow
spindles and grinding spindle is provided with means by which it can be attached to
the work to be operated on or to any suitable place in proximity thereto.
Dated this 15th day of January 1887.
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, W.C.,
Agents for Ralph Peacock.

page_text: COMPLETE SPECIFICATION.
Improvements in Apparatus for Grinding, Enlarging, and Trueing
Round Holes, and for Grinding and Trueing Circular and Plane
Surfaces.
I RALPH PEACOCK of Gorton Foundry Manchester in the County of Lancaster
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 :-
My Improvements relate to grinding machines by which round holes can be enlarged
and made true and by which cylindrical or flat surfaces can be inade truo for example
after being drilled, worn irregular or case hardened.
The machine can be made according to my Invention either fixed or portable and
in the former case it consists of a firm bed or support upon which is mounted a head-
stock which may be adjustable and in which a sleeve is mounted so that it can be
revolved by means of a worm carried by the headstock engaging with a worm wheel
fixed to the sleeve or by any other suitable actuating device. In this sleeve there is
mounted a hollow spindlo bored eccentrically to its external diameter. This spindle
(which I will call the outer hollow spindle) is keyed or connected to the sleeve so that
it revolves with it and it may also be moved axially or lengthwise by means of a cam
and lever or other means. In this outer hollow spindle there is another spindle also
bored eccentrically to its external diameter (which I will call the inner hollow spindle)
which can be secured by a nut or otherwise so that it revolves with the outer hollow
spindle in which (by a hand wheel fixed thereon or otherwise) it can be adjusted
eccentrically to give the requisite range of circular motion to the grinding spindle
which extends through the said inner hollow spindle and is driven by means of a
pulley fixed thereon or by any suitable means independently of the means by which
the sleeve and hollow spindles are driven. The projecting end of the grinding spindle
carries the emery wheel or other tool by which the grinding or other operation is
effected and when the apparatus is in operation the said wheel or tool is rotated on its
own axis by the rotary motion given to the grinding spindle whilst it has the necessary
revolving motion through a circular path given to it by the mechanism which drives
the sleeve and eccentrically bored spindles the extent of this circular path being
regulated by the relative adjustment of the inner and outer hollow spindles. It also
has when required a lengthwise movement given to it by the cam and lover or other
mechanism as herein before mentioned.
There may be one or more headstocks and tools arranged as described carried by
the same plate or framing.
When the apparatus is to be portable the headstock carrying the sleeve, hollow
spindles and grinding spindle is provided with means by which it can be attached to
the work to be operated upon or to any suitable place in proximity thereto.

page_text: And in order that my Invention may be well understood I will now proceed to
describe the manner in which the same may be performed referenco being had to the
accompanying drawings and to the Figures and letters marked thereon.
Figure 1 is a front elevation and Figure 2 is an end elevation of an apparatus
arranged as a fixed apparatus and constructed according to my Invention from which
its construction as a portable apparatus will also bo understood. Figure 3 is a vertical
section drawn to a larger scale and Figure 1 is a horizontal section of the spindles
drawn to a still larger scale. In the arrangement shewn the grinding spindles are in
a vertical position but they may be arranged horizontally or at any suitable angle.
A' is a firm cast iron bed and A² a cast iron table which are both supported upon cast
iron standards A. On the bed A' are mounted one or more head stocks J J which
are adjustable both longitudinally and transversely by means of the compound slide b
and screws 6º. In each headstock J J a cylindrical sleeve A revolves, motion being
given to it by means of a worm L and wheel M (see Fig. 3) deriving motion from
any suitable prime mover.
In the sleeve A there is the outer hollow spindle b bored eccentrically to its external
diameter and caused to revolve with the sleeve A by means of the key H. The hollow
spindle b is also moveable within the sleeve A in the direction of its own axis by means
of a disc crank K adjustable connecting rod K2 and lever K engaging between the
collars 63 and centered at k, its outer end being provided with a chain k for the
balancing weight A*.
In the hollow spindle 6 there is the inner hollow spindle C also bored eccentrically
to its external diameter and capable of revolving with the hollow spindle b in which
it can be adjusted and fixed in a plane transverse to its axis (by means of a hand
wheel F and lock nut f) to give the required range of circular motion to the grinding
spindled which latter revolves within the inner hollow spindle C being driven
independently of the sleeve A and hollow spindle 6 and C from the prime mover by
the pulley I keyed to the said spindle.
The hollow spindles & and C and the grinding spindle d are balanced by means of
the weight A'.
At each end of the table A³ there are shown centrifugal pumps A' which may be
used for lubricating the emery wheels or other tools E.
When the machine is constructed as a portable machino the headstock J J
containing the sleeve A the hollow spindles b and C and grinding spindle d and their
attachments may be made of any convenient shape for attachment to the work to be
operated upon or to some place adjacent.
The said parts may be attached to the head stock by an adjustable and fixable
quadrant to enable the grinder or other tool to be brought to any desired position.
The movements thus communicated to the emery or other wheel or tool E for any
of the purposes above described are or may be therefore as follows:
Revolution on its own axis by means of the pulloy I.
Rectilinear movement in the direction of its own axis communicated by the
lever K' and disc crank K.
Circular movement in a plane at right angles to its own axis the radius of which
movement can be adjusted by means of the hand wheel F to any dimension between
the sum of and the difference between the eccentricities of the two eccentrically bored
spindles b and C.
Double rectilinear movement in a plane parallel with the table A' by means of the
slide 6¹ and screws 62. It will be readily understood that I do not limit myself to the
means shewn for giving motion to the various parts as they can be varied without
departing from the nature of my Invention.
Having now particularly described the nature of my said Invention, and in what
manner the same is to be performed I declare what I claim is.
First In apparatus for the purposes aforesaid the combination of means for
imparting movement to a revolving emery wheel or other tool in a circular path or path
of revolution in the same plane as that in which it revolves on its own axis and means

page_text: for giving longitudinal movement at right angles to the said plane of circular move-
inent and rotation the grinding spindle being mounted in an excentrically bored
inner hollow spindle mounted in an excentrically bored outer revolving spindle to
which movement longitudinally in a sleeve is imparted all substantially as herein-
before described and whether the apparatus be arranged as a fixed or as a portable
apparatus.
Second-In apparatus for the purposes aforesaid the combination of means for
imparting movement to a revolving emery wheel or other tool in a circular path or
path of revolution in the same plane as that in which it revolves on its own axis and
means for giving longitudinal movement at right angles to the said plane of circular
movement and rotation the grinding spindle being mounted in an excentrically bored
inner hollow spindle mounted in an excentrically bored outer revolving spindle and
being provided with means for adjusting its position in the said outer spindle in the
plane of circular movement and rotation and means for giving movement longi-
tudinally to the said tool all substantially as herein before described and whether the
apparatus be arranged as a fixed or as a portable apparatus.
Third In apparatus for the purposes aforesaid the combination of a grinding
spindle or tool holder mounted excentrically in a hollow spindle and combined with
operating means in such manner and that the operating tool receives a motion of
rotation on its own axis and motion in a circular path or a motion of revolution sub-
stantially as hereinbefore described and whether arranged as a fixed bar or as a
portable apparatus.
Fourth-The arrangement and combination of parts constituting the machine
herein before described and illustrated in the accompanying drawings whether
arranged as a fixed or as a portable machine.
1887
day
J. H. JOHNSON & Co.,
47, Lincoln's Inn Fields, London, W.C.,
Agents.