Improvements in Sliding and Screw Cutting Lathes.
Year: 1892

page_text: Date of Application, 5th Mar., 1892
Complete Specification Left. 5th Dec., 1892-Accepted, 7th Jan., 1893
PROVISIONAL SPECIFICATION.
Improvements in Sliding and Screw Cutting Lathes.
I, JOHN MALLINSON, of the firm of Mallinson Brothers, of Mytholm near
Halifax, in the County of York, Ironfounders and Machine Tool Makers, do
hereby declare the nature of this invention to be as follows:-
This invention has reference to sliding, surfacing, and screw cutting lathes, and
relates to means to be employed for supporting the reversing plate and change
wheels connected with the head-stock of lathes. I make the ordinary "tail-bar"
with a plate extending downwards which is made to carry the stud of the reversing
plate, and also the stud of the uppermost change wheel. By this means increased
stability is given to the parts and the change wheel is now outside the "tail-bar,"
instead of under it as forinerly, which enables me to use a change wheel of much
larger diameter than formerly.
Dated this 4th day of March 1892.
TASKER & CROSSLEY,
Halifax, Agents.
COMPLETE SPECIFICATION.
Improvements in Sliding and Screw Cutting Lathes.
I, JOHN MALLINSON, of the firm of Mallinson Brothers, of Mytholm, near
Halifax, in the County of York, Ironfounders and Machine 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 :-
This invention has reference to sliding, surfacing and screw cutting lathes and
relates to means to be employed for supporting the reversing plate and change
wheels connected with the head-stock of lathes.
Such being the nature and object of my invention I will now proceed to describe
the same more fully, and for that purpose make reference to the accompanying
sheet of drawings, wherein
56
Fig. is end elevation of such portions of a slide lathe as is necessary to illustrate
my invention and Fig. 2 is front elevation of same. A represents a portion of the
fast head-stock and B the driving cones. C represents the tail-bar" attached in
" I now
the ordinary manner to the head-stock by tail pins D. The "tail-bar
make with a plate E extending downwards and slotted at F to receive the stud G
of the reversing plate H the said plate E also receiving the stud 1 which carries
and supports the uppermost change wheel J driven from the spur wheels K which
receive their rotary motion from the driving cones. The bottom of the plate E is
secured and steadied by bolts and brackets L projecting from the head-stock. By
the employment of the plate E extending from the "tail-bar" C increased stability
is given to the parts and I am now enabled to place the uppermost change wheel J
outside the tail-bar" instead of under it as formerly whereby I can use a change
wheel of much larger diameter than formerly which is very advantageous.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
In lathes for sliding, surfacing and screw cutting, the use of a "tail-bar" having

page_text: a projecting plate E for receiving the studs of the reversing plate and uppermost
change wheel in manner substantially as herein shewn and described.
Dated this 3rd day of December 1892.
TASKER & CROSSLEY,
Halifax, Agents.