IMPROVEMENTS IN CUTTERS AND CUTTER HOLDERS USED IN LATHES AND OTHER TOOLS
Year: 1884

page_text: апа опет то018.
We WILLIAM FORD SMITH and ARTHUR COVENTRY of Gresley Iron Works,
Salford, in the County of Lancaster, Engineers and Tool Makers, do hereby declare
the nature of the said invention for "IMPROVEMENTS IN CUTTERS AND CUTTER
HOLDERS USED IN LATHES AND OTHER TOOLS," to be as follows:-
In our Patent Capstan rest Lathes, and other similar Lathes a variety of cutters
are used secured in holders, carried on the capstan rest or box so as to be brought
in operation one after the other, our improvements 'relate to cutters and tool
holders for capstan rest Lathes, but which cutters and holders may also be used in
other Lathes or Tools for turning, chasing, planing and cutting metals-One of our
improvements relatos to the swivel cutter or tool holder which is formed by a
shank part for insertion in the capstan or other rest or box, a bolt through the
holder or end of the shank, which bolt has a slot in it for the cutter held in a
diagonal position, and a deep washer or collar on the bolt.
Our improvement consists in toothing the surface of the deep washer or collar
and that surface of the holder or shank which come in contact so as to give firm
hold when the bolt is screwed up to resist the 'strain at any angle at which the
cutter may be set in the holder-The deep washer or collar need only be partly
toothed, and a portion only of the surface in the shank or holder in contact with
it need only be toothed, and in some cases one surface only need be toothed.
In other cases part of the peripheral surface of the deep washer or collar and
that part of the shank opposite or in contact with it need only be toothed-In the
latter case instead of the shank being toothed a loose piece is toothed and inserted
in a recess in the shank, or a wedge is toothed and inserted in a hole, to key
against the toothed deep washer or collar.
Another of our improvements relates to the parting or dividing cutter or tool
which is also secured in the capstan or other rest or box and consists in forming
the cutter of a piece of steel of uniform cross section wider at one edge than the
other, which piece of steel is properly tempered and then only needs grinding at
one end to keep it sharp. The lengthway of the cutter is held nearly vertical'
having angle from the vertical only enough to give clearance when cutting. The
shank or holder for this cutter is recessed on one side to receive the cutter which

page_text: is secured in the recess by a wedge headed screw bolt passing across through a
hole in the shank or holder which firmly holds the cutter when screwed up-The
back edge of the cutter is or may be toothed and secured by a wedge toothed to
correspond if required.
Another of our improvements relates to chasing or screw cutting tools used in
the capstan and other rests or boxes.
The cutter or chaser in this case is formed of a piece of steel of uniform cross
section one face of the cutter is grooved from end to end to form the threads the
tops of the teeth forming the grooves are ground off on one side, this cutter or
chaser is also used in nearly a vertical position, as when it is formed and tempered
it only requires grinding at one end to keep it sharp. It is secured in the shank
or holder at such angle from the vertical as will give clearance when cutting being
inserted in a hole in the shank and secured therein by a wedge-headed screw bolt
fitted in a hole passing across the shank.
The back of the cutter is or may be toothed and may be secured by a toothed
.wedge to correspond if required.
COMPLETE SPECIFICATION..
Improvements in Cutters and Cutter Holders Used in Lathes
and other Tools.
We WILLIAM 'FORD SMITH and ARTHUR COVENTRY of Gresley Iron Works,
Salford in the County of Lancaster, Engineers and Tool Makers, 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 :—
In our Patent Capstan rest Lathes, and other similar Lathes a variety of cutters
are used secured in holders, carried on the Capstan rest or box so as to be brought
in operation one after the other, our improvements relate to cutters and tool holders
for capstan rest Lathes, but which cutters and holders may also be used in other
Lathes or Tools for turning, chasing, planing and cutting metals-One of our
improvements relates to the swivel cutter or tool holder which is formed by a
shank part for insertion in the capstan or other rest or box a bolt through the
holder or end of the shank, which bolt has a slot in it for the cutter held in a
diagonal position, and a deep washer or collar on the bolt.
-
Our improvements consists in toothing the surface of the deep washer or collar
and that surface of the holder or shank which come in contact so as to give firm

page_text: hold when the bolt is screwed up to resist the strain at any angle at which the
cutter may be set in the holder-The deep washer or collar need only be partly
toothed, and a portion only of the surface in the shank or holder in contact with it
need only be toothed, and in some cases one surface only need be toothed.
-
In other cases part of the peripheral. surface of the deep washer or collar and
that part of the shank opposite or in contact with it need only be toothed-In the
latter case instead of the shank being toothed a loose piece is toothed and inserted
in a recess in the shank or a wedge is toothed and inserted in a hole, 'to key
against the toothed deep washer or collar.
Another of our improvements relates to the parting or dividing cutter or tool
which is also secured in the capstan or other rest or box and consists in forming
the cutter of a piece of steel of uniform cross section wider at one edge than the
other, which piece of steel is properly tempered and then only needs grinding at
one end to keep it sharp. The lengthway of the cutter is held nearly vertical
having angle from the vertical only enough to give clearence when cutting-The
shank or holder for this cutter is recessed on one side to receive the cutter which
is secured in the recess by a wedge headed screw bolt passing across through a hole
in the shank or holder which firmly holds the cutter when screwed up-The back
edge of the cutter is or may be toothed and secured by a wedge toothed to
correspond if required.
Another of our improvements relates to chasing or screw cutting tools used in
the capstan and other rests or boxes.
The cutter or chaser in this case is formed of a piece of steel of uniform.cross
section one face of the cutter is grooved from end to end to form the threads the
tops of the teeth forming the grooves are ground off on one side this cutter or
chaser is also used in nearly a vertical position, as when it is formed and tempered
it only requires grinding at one end to keep it sharp. It is secured in the shank
or holder at such angle from the vertical as will give clearence when cutting being
inserted in a hole in the shank and secured therein by a wedge headed screw bolt
fitted in a hole passing across the shank.
The back of the cutter is or may be toothed and may be secured by a toothed
wedge to correspond if required.
Fig. 1 is a side elevation fig. 2 a plan and fig. 3 an underside plan of a swivel
tool holder according to one modification of our invention.
a is the shank part, ba bolt with an inclined slot in it for the cutter c, d is a
washer or collar on the bolt which is also slotted for the cutter to pass through.
The shank a is toothed or serrated as shown in figs. 1 and 3, and that end of
the collar d which comes against the shank part a is also toothed or serrated to
correspond with the teeth or serrations on the shank a so that when the nut on
the bolt b is slackened the cutter c can be placed at any required angle and when
screwed up it then firmly holds the cutter c in the required position.
In the modification shown by figs. 1, 2 and 3 a part (a) of the shank a is left
untoothed as shown in fig. 3, and a part of the collar d is also left untoothed, but
in the modification shown by the sectional elevation fig. 4 and by fig. 5 the end
view of the collar d the entire surface is toothed or, serrated as shown.
In the modification shown by fig. 6 a sectional elevation, fig. 7 a plan view and
fig. 8 an end view of the collar detached. The collar is toothed or serrated on its
periphery and when the cutter c is placed at the required angle the collar dis
secured by a wedge e toothed on its face to correspond with the teeth on the
periphery of the collar d which thus firmly secures the cutter c when the bolt b is
screwed up.
"
Fig. 9 is a side elevation and fig. 10 a plan section of an holder and cutter
termed a "parting cutter which is made of steel of the form shown in cross
section in fig. 10 that is, wider on the cutting than on the back edge-The
holder or shank part a is prepared with a recess on one side as shown to receive
the cutter. c which is secured by a bolt b with a wedge ended head that fits a
corresponding slot formed in the shank or holder part a.

page_text: $
In the modification shown by figs. 11 and 12, the edge of the cutter c which
comes against the wedge headed bolt b is toothed or serrated, and that face of the
bolt b is also toothed or serrated to correspond.
Fig. 13 is a side elevation and fig. 14 is a plan section showing one modification
of our improved chasing cutter and holder.
The cutter c is made of steel and one face is toothed or fluted the entire length
of the cutter to the pitch of the screw to be cut. This cutter is fitted as shown
in an inclined slot in the holder a and the cutter is secured when adjusted by the
bolt b having a wedge shaped head as in figs. 9, 10, 11, and 12.
Figs. 15 and 16 are views corresponding respectively to figs. 13 and 14 of
another modification of chasing tool holder, the same as that shown by figs. 13
and 14 except that the inside of the cutter c is toothed or fluted or serrated at
right angles to the teeth or flutes for chasing and the wedge headed bolt b is also
fluted, toothed or serrated to correspond.
Fig. 17 is a sectional elevation and fig. 18 a plan illustrating another modification
of chasing tool holder where the cutter c is like that shown in figs. 15 and 16, and
is fitted to the slot in the holder a for the cutter but is secured by a wedge b¹
having teeth or flutes on the face coming against the cutter c corresponding to the
teeth, flutes or serrations on the cutter.
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. The combination of swivel cutters with their holders substantially as herein-
before described and illustrated by the drawings.
2. The construction of "parting" cutters and combination with their holders
substantially as hereinbefore described and illustrated by the drawings.
3. The construction of chasing cutters as herein before described and the com-
bination of the same with their holders substantially as hereinbefore described and
illustrated by the drawings.
'
Dated this sixteenth day of Cantom100x