Improvements relating to Tool Holders or Rests for use with. Lathes.
Year: 1890

page_text: Date of Application, 16 h May, 1890
Complete Specification Left, 17th Oct., 1890-Accepted, 22nd Nov., 1890
PROVISIONAL SPECIFICATION.
Improvements relating to Tool Holders or Rests for use with.
Lathes.
We WILLIAM BARRACLOUGH Ironfounder and ALBERT RHODES Foreman, both of
Providence Foundry, Stanningley, Yorkshire, do hereby declare the nature of this
invention to be as follows:-
:-
This invention relates to tool holders which are (combined and) used in con-
junction with turning and boring lathes and has for its object to enable the tools
which are fixed therein to be more easily adjusted to any required pitch or angle
than by the means at present employed for that purpose.
In carrying out our invention we construct a bed (or base) plate and centre stud
for our tool holder and furnish it with the usual screw mechanism for travelling
and fixing the apparatus.
Upon the centre stud we fit a revolving metal stock and in its vertical face we
form dovetailed slots with a cavity behind each slot for receiving a bridge or staple
and having a screw threaded hole extending backward from the said cavity through
the body of the stock, to the opposite side thereof.
Into each dovetailed slot we adjust a moveable jaw piece capable of being partially
raised up above or similarly lowered down below, the upper and lower surfaces of
the said stock.
Each of the said moveable jaws has forward projections or bearers upon it for
receiving and supporting the tool.
Each, either, or any of the said projecting bearers is pierced with a screw threaded
hole for the reception of a tightening screw.
A spindle with plain annular collars and screw threaded centre part, is fitted in
suitable semi-annular seats, formed (half) in the face of the stock and (balf) in
the back of the moveable jaw, and the back of each moveable jaw is screw-threaded,
longitudinally, to correspond with the spindle. One end of each spindle is shaped
suitably for manipulation with a spanner or other tool.
The several parts of this apparatus are put together thus :--
A metal bridge or staple is first laid within the cavity before named and the screw
threaded spindle laid in the bi-annular seats: the moveable jaw is introduced at one
end of the dovetail slot until its screw threaded part engages with the screw thread
upon the spindle when the latter is revolved until the jaw is drawn up to its required
position. By revolving the spindle the jaw is thereafter raised or lowered. A screwed
bolt is put into the screwed bore behind the bridge or staple and as it is revolved
bears upon the back of the said bridge and causes it to press forward the jaw against
its dovetailed astragals and assists the screwed spindle in retaining the jaws rigidly at
any elevation.
A screwed bolt is inserted also in one (at least) of the projecting parts of the jaw-
for the purpose of fixing the turning or boring tool tightly within the before named
projecting parts of the jaw.
When two of these jaws are thus inserted, adjacently, within the dovetailed slots
before named and the cutting tool placed therein the same can be adjusted at any
angle by means of the facilities above described for raising and lowering each or
either of the said jaws and fixing the jaws, and the tool therein, rigidly in position by
means of the before named screws..
Dotel
1000

page_text: B
COMPLETE SPECIFICATION.
Improvements relating to Tool Holders or Rests for use with
Lathes.
We WILLIAM BARRACLOUGH, Ironfounder and ALBERT RHODES, Foreman, both
of Providence Foundry, Stanningley Yorkshire, 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:-
This invention relates to tool-holders which are combined (and used in conjunction)
with turning and boring lathes, and has for its object to enable the tools which are
fixed therein, to be more easily adjusted to any required pitch or angle than by the
means at present employed for that purpose.
In carrying out our invention we construct a bed (or base) plate and centre stud
for our tool holder and furnish it with the usual screw mechanism for travelling and
fixing the apparatus.
Upon the centre stud we fit a revolving metal stock and in or upon its vertical face
we form dovetailed slots with a cavity penetrating backward behind each slot for
receiving a bridge or staple and having a screw threaded bore hole extending
backward from the said cavity through the body of the stock to the opposite side
thereof.
Into each dovetailed slot we adjust a moveable jaw piece capable of being partially
raised up. above or similarly lowered down below the upper and lower surfaces of the
said stock.
Each of the said 'moveable jaws has forward projections or bearers upon it for
receiving and supporting a shaping tool.
Each, either or any of the said projecting bearers is pierced with a screw threaded
hole for the reception of a tightening screw.
A spindle with plain annular collars and screw threaded centre part, is fitted in
suitable semi-annular seats, formed (half) in the face of the stock and (half) in the
back of the moveable jaw and the back of each moveable jaw is screw threaded,
longitudinally, to correspond with the spindle. One end of each spindle is shaped
suitably for manipulation with a spanner or other tool.
The several parts of this apparatus are put together thus,―
A metal bridge or staple is first laid within the cavity before named and the screw
threaded spindle laid in the bi-annular seats: the moveable jaw is introduced at one
end of the dovetailed slot until its screw threaded part engages with the screw thread
upon the spindle when the latter is revolved until the jaw is drawn up to its required
position. By revolving the spindle the jaw is thereafter raised or lowered. A screwed
bolt is put into the screwed bore hole behind the bridge or staple and as it is revolved
bears upon the back of the said bridge and causes it to press forward the jaw against
its dovetailed astragals and assist the screwed spindle in retaining the jaws rigidly at
any elevation.
A screwed bolt is inserted also in one (at least) of the projecting parts of the jaw
for the purpose of fixing the turning or boring tool tightly within the before named
projecting parts of the jaw.
When two of these jaws are thus inserted adjacently, within the dovetailed slots
before named and the cutting tool placed therein the same can be adjusted at any
anglo by means of the facilities above described for raising and lowering each or
either of the said jaws and fixing the jaws and the tool therein, rigidly in position
by means of the before named screws.
In order that our invention may be more clearly understood and more readily
carried into effect, we have prepared the accompanying drawings illustrative of it
and of its several parts in which ;-
Fig. 1. is a front view in elevation

page_text: Fig. 4. is a section through A. A. Fig. 1 ; .
Fig. 5. is a section through B. B. Fig. 1;
Fig. 6. is a front view in perspective;
Fig. 7. is a back view in perspective;
Figs. 8. to 15 inclusive, are views in perspective illustrative of various parts of our
improved tool holder.
To effect the aforesaid objects we make the jaws of our tool holder in two
(duplicate) and separable parts each of which may be detached from the body of
the tool-holder and both are raised and lowered by means of screwed spindles
placed conveniently between each jaw and the stock or body of the tool-holder.
In Figures 8 and 9 we have shewn the skeleton body or stock of our tool holder
with dovetailed slides C. C. which are for the purpose of receiving the adjustable
jaws D. D. Figs. 10. 12. 13. and 15.
When these jaws are inserted within the slides they are pressed firmly against their
dovetail or astragal faces by means of the screws E. Figs. 2. to 13. each operating
upon a bridge or staple F as shewn in Figs. 4. to 13.
The bridge or staple F being laid in the cored recess * Fig. 9. the screwed
spindle f³ (Fig. 14) is then laid within the adjacent grooves, seats or journals G,
Figs. 8 and 9 and the jaw D is introduced into the slide.
By revolving the screwed spindle f³ its associate jaw is fully drawn up into the
dovetailed slide as shewn in Figs. 1. to 7.
When this tool "holder" is completely fitted together as shewn in Fig. 7. either of
its adjustable jaws can be raised up as shewn at H Fig. 1. by revolving the said
spindle and by this means the tool J Fig. 1. may be "pitched" at any required
angle: the curvature of the faces K. K. being conveniently adapted for this purpose.
The tool J is held rigidly in its position by means of the set screws L which are con-
tained in each adjustable jaw. It will be understood by those persons who are
familiar with engineers tool-holders that this appliance is fixed upon an upright centre
stud or spindle attached to a bed or plate, the holder being provided with a bore or
centre hole, M, Figs. 3. to 9, for this purpose.
In Fig. 15. we bave shewn a slightly different form for the adjustable jaw; the
parts marked D. D. being united by a pillar or tail piece D³.
We sometimes make the jaws D. D. with a curved face to the upper part, H,
Fig. 1. to correspond with that of the lower part K, and the said lower part K we
also pierce with a screw threaded hole similarly to the top part whenever these
alternations are best adapted for the position in which the tool is required to
work.
The bridge or staple F Figs. 4 to 13. does not impinge upon the screwed
spindle but bears upon certain faces of the adjustable jaw D as shewn in the said
figures.
Instead of the dovetailed slides, C, being formed in the body of this tool-holder
and the corresponding tongue pieces upon each jaw as before described, the said
slide may be formed in each jaw and the tongue pieces upon the said body without
deviating from the essential particulars or general scope of this invention.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
:-
1st. In a tool-holder for use in connection with turning or boring lathes, or
such like machinery the combination of mechanical parts all substantially as herein
described and shewn and for the purpose specified.
2nd. In a tool-holder, the combination of mechanical parts, or their equivalents, all
substantially as herein described and shewn, and, for the purpose specified.
3rd. In a tool-holder, the combination therewith of one or more sliding jaws D,

page_text: or any mere modification thereof, all substantially as herein described and shewn,
and, for the purpose specified.
Dated this 12th day of September 1890.
JOSEPH LOCKWOOD,
263, Argyle Street, Glasgow, Agent for the Inventors.