Improvements in or relating to Boring, Grooving, and Internal Screw-thread-cutting Apparatus for Use in Lathes.
Year: 1894

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to Boring, Grooving, and Internal
Screw-thread-cutting Apparatus for Use in Lathes.
We, JOSEPH APPLEBY CRAWFORD and THOMAS APPLEBY CRAWFORD, both
of Bonner's Field Engine Works, Sunderland in the County of Durham, Engineers,
do hereby declare the nature of this invention to be as follows:-
This invention has reference to improvements in or relating to boring grooving
and internal screw-thread-cutting apparatus for use in lathes.
Owing to the increased and increasing length of nuts and like objects in
certain departments of engineering practice it has become necessary to devise
means for keeping the work more mechanically true when in the lathe and by the
present invention not only can better work be performed but it can be done in a
shorter time.
To effect this purpose we employ a bar or spindle adapted to be set eccentrically
to the required degree in the lathe centres and on the bar and a true fit thereon we
mount a sleeve which is arranged and designed to carry the tool or cutter device.
At or on the sleeve end or ends there may be a flange or disc device preferably
with a lateral slotted or holed projection or lug and on the bar there may
be a lever or equivalent mechanism for turning and locking or setting and releasing
the apparatus.
The chuck pin or driver can revolve the apparatus by a suitable connection
between the chuck and the aforesaid disc or the lug thereon and the lever or
equivalent mechanism as aforesaid can be used to revolve the apparatus to a
certain extent or part thereof on its eccentric centre so as to bring up the tool to
the cut.
The work will be fixed to or on the lathe saddle care being taken to ensure
sufficient throw or eccentricity of the bar or its equivalent to enable the tool to be
brought up to its cut.
The disc may be
more or less circumferentially grooved and notched to
facilitate the setting and locking of the lever or equivalent mechanism in the
required position when setting or withdrawing the tool to or from its cut.
A collar and check nuts may be provided to regulate the position of the sleeve
on the bar and the saddle will be regulated in its travel in the ordinary way.
Dated this 20th day of September 1894.
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent.

page_text: Improvements in or relating to Boring, Grooving, and Internal
Screw-thread-cutting Apparatus for Use in Lathes.
We, JOSEPH APPLEBY CRAWFORD and THOMAS APPLEBY CRAWFORD, both
of Bonner's Field Engine Works, Sunderland in the County of Durham, 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 :-
This invention has reference to improvements in or relating to boring, grooving
and internal screw-thread-cutting apparatus for use in lathes.
Owing to the increased and increasing length of nuts and like objects in certain
departments of engineering practice it has become necessary to devise means
for keeping the work more mechanically true when in the lathe and by the
present invention not only can better work be performed but it can be done in a
shorter time.
To effect this purpose we employ a bar or spindle adapted to be set eccentrically
to the required degree in the lathe centres and on the bar and a true fit thereon
we mount a sleeve which is arranged and designed to carry the tool or cutter
device.
At or on the sleeve end or ends there may be a flange or disc device preferably
with a lateral slotted or holed projection or lug and on the bar there may be a
lever or equivalent mechanism for turning and locking or setting and releasing the
apparatus.
The chuck pin or driver can revolve the apparatus by a suitable connection
between the chuck and the aforesaid disc or the lug thercon and the lever or
equivalent mechanism as aforesaid can be used to revolve the apparatus to a
certain extent or part thereof on its eccentric centre so as to bring up the tool to
the cut.
The work will be fixed to or on the lathe saddle care being taken to ensure
sufficient throw or eccentricity of the bar or its equivalent to enable the tool to be
brought up to its cut.
The disc may be more or less circumferentially grooved and notched to facilitate
the setting and locking of the lever or equivalent mechanisin in the required
position when setting or withdrawing the tool to or from its cut.
A collar and check nuts may be provided to regulate the position of the sleeve
on the bar and the saddle will be regulated in its travel in the ordinary way.
We will fully describe our invention with reference to the accompanying
drawings in which Figure 1 shows an end view, Figure 2 a side view partly in
section and Figure 3 a transverse section on line a. y in Figure 2 of the improved
apparatus and in the following description like marks of reference designate like
parts.
Referring to the drawings a is a bar or spindle intended to be set eccentrically
to the required degree in the lathe centres and on the bar and a true fit thereon we
mount a sleeve a¹ arranged to carry the tool or cutter 2. At or on the sleeve end
we arrange a dise 3 which may be provided with a slot 4 and on the bar we mount
a lever 5 for the purposes described.
The chuck pin or driver can pass through the slot 4 in the disc to revolve the
apparatus.
The disc may further be provided as shown with a semi-circular slot 11 and
peripheral teeth 6 so that when the lever 5 is turned to turn the bar it can be
locked in any required position by means of the projecting tooth 7 thereon gearing
with the teeth 6; the locking bolt 8 serving to make the connection between lever
and disc secure.

page_text: A collar 9 with nuts 10 may be provided to regulate the position of the sleeve on
the bar.
The operation or manner of working is as follows:-
:―
The bar with the apparatus shown thereon is set in the lathe centres eccentrically
to the required degree. The chuck pin is placed in position for driving the
apparatus. The operator can then by manipulating the lever 5 bring up the
tool fixed in the sleeve to its cut or work when he will lock the lever to
the disc and in like manner it will be observed that as the cut varies by further
turning or manipulating the lever the tool can be further brought up to or with-
drawn from its cut according to the amount of throw due to the degree of
eccentricity given to the bar in the lathe centres.
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 :-
1. The improvement in boring grooving and internal screw-thread-cutting
apparatus for use in lathes consisting in the arrangement or combination of a bar
and lever adapted to be set eccentrically in the lathe with a sleeve adapted to carry
the tool the sleeve being provided with a disc baving a slot 4 for the connection
of the driving pin and a semi-circular slot and set of peripheral teeth for the
required adjustment of the lever 5 in setting the tool the parts being arranged
disposed or adapted for use substantially as and for the purposes herein set
forth.
2. The improvement in boring grooving and internal screw-thread-cutting
apparatus for use in lathes consisting in the arrangement or combination of parts
substantially as herein described and illustrated in the accompanying drawings.
Dated this 21st day of June 1895.
A. CRAWHALL CHAPMAN,
3 St. Nicholas Buildings, Newcastle-on-Tyne, Patent Agent.