IMPROVEMENTS IN LATHES
Year: 1875

page_text: LETTERS PATENT to Andrew Muir, of the Albion Works, Strange-
ways, Manchester, in the County of Lancaster, Engineer, for the
Invention of " IMPROVEMENTS IN LATHES."
PROVISIONAL SPECIFICATION left by the said Andrew Muir at
the Office of the Commissioners of Patents, with his Petition, on
the 14th May 1875.
.
I, ANDREW MUIR, of the Albion Works, Strangeways, Manchester,
in the County of Lancaster, Engineer, do hereby declare the nature of
the said Invention for "IMPROVEMENTS IN LATHES," to be as follows:-
This Invention relates to slide and screw cutting lathes having change
wheels for varying the traversing speed of the slide rest according to
the diameter and nature of the material or metal to be turned, and the
diameters and pitches of the screws, and consists in making a stud com-

page_text: monly called the maundrel stud, which has hitherto been permanently
stationary, capable of being radiated to different positions to suit any
diameter of change wheels, and afterwards fixed.
In order that my Invention may be clearly understood I annex two
Sheets of outline Drawings with letters of reference, in which Figs. 1 ₺
and 2, Sheet 1, and Figs. 3, 4, and 5, Shect 2, are various views repre-
senting the application of my improvements to slide and screw cutting
lathes.
In one or other of the various Figures a represents the back of the
headstock of the lathe; b, the back end of the maundrel; c, the tail pin; 1
d, the adjustable cross piece to which the tail pin is connected; and e,
the first spur wheel fixed on the maundrel for giving by means of change
wheels different traversing speeds to the slide rest.
In cach case the cross piece d has a boss f, on which is placed a radial
arm 9 carrying the radial maundrel stud h; and the arm, 'after being 1
radiated to any required position-is held fast by the tec-headed bolt k,
the head being entered from the back into the slot / before the tail pin c
is fixed in its place.
In Figs. 1 and 2, Sheet 1, which is an arrangement for sliding and
cutting screws right hand only, the spur wheel e on the maundrel 6 2
gears direct into the wheel m on the maundrel stud ; but in Figs. 3, 4,
and 5, Sheet 2 (which is an arrangement for sliding and cutting screws,
right or left hand, without changing the "change wheels,") it gears into
one or other of the wheels n, o, geared into the wheel p on the maundrel
stud h; one of the wheels n, o, being used when right-handed screws are 2
to be cut, and the other for left-handed screws.
SPECIFICATION filed in pursuance of the conditions of the Letters
Patent, and of an Order of the Lord Chancellor, by the said Andrew
Muir in the Great Seal Patent Office on the 1st December 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ANDREW 3
MUIR, of the Albion Works, Strangeways, Manchester, in the County
of Lancaster, Engineer, send greeting.

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Fourteenth day of May, in the year
of our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Her heirs and successors,
givo and grant unto me, the said Andrew Muir, Her special license,
that I, the said Andrew Muir, my executors, administrators, and
assigns, or such others as I, the said Andrew Muir, my executors,
administrators, and assigns, should at any time agree with, and no
others, from time to time and at all times thereafter during the term
therein expressed, should and lawfully might make, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN
LATEES," upon the condition (amongst others) that I, tho said Andrew
Muir, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, should particularly
describe and ascertain the nature of the said Invention, and in what
manner the same was to be performed, and cause the same to be filed
in the Great Seal Patent Office on or before the Eighth day of December
One thousand eight hundred and seventy-five.
"
NOW KNOW YE, that I, the said Andrew Muir, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by
the following statement, reference being had to the figures on the
accompanying Sheet of Drawings, and to the letters of reference
marked thereon (that is to say) :—
This Invention relates to slide and screw-cutting lathes having chango
wheels for varying the traversing speed of the slide rest according to
the diameter and nature of the material or metal to be turned, and the
diamoter and pitches of the screws to be cut, and one part of the
improvements consists in making a stud commonly called the maundrel
stud, which has hitherto been permanently stationary, capable of being
radiated to different positions to suit any diameter of chango wheels,
and afterwards fixed; and on the accompanying Sheets of Drawings,
Figs. 1, 2, 3, 4, and 5 are various views representing the application of
this part of my improvements to slide and screw cutting lathes.
In one or other of the Figures a represents the back of the headstock
of the lathe; b, the back end of the maundril; c, the tail pin; d, the

page_text: adjustable cross piece to which the tail pin is connected; and e, the
first spur wheel fixed on the maundril for giving by means of change
wheels different traversing speeds to the slide rest.
In each case the cross piece d has a boss f, on which is placed a radial
arm g carrying the radial maundril stud h; and the arm, after being
radiated to any required position, is held fast by the tee-headed bolt k,
the head being entered from the back into the slot before the tail pin
is fixed in its place.
In Figs. 1 and 2 is shewn an arrangement for sliding and cutting
screws right hand only. The spur wheel e on the maundril 6 gears
direct into the wheel m on the maundril stud h; but in Figs. 3, 4, and 5
(which represent an arrangement for sliding and cutting screws, right or
left hand, without changing the change wheels) it gears into one or other
of the wheels n, o, geared into the wheel p on the maundril stud h, onc
of the wheels n, o, being used when right-handed screws are to be cut,
and the other for left-handed screws.
..
In Figs. 6, 7, 8, 9, 10, and 11 I shew an improved arrangement for
enabling overhead hangers and driving apparatus to be fixed to the
ceiling, wall, or other holder at any required angle or position, and the
improvement consists in making the bracket r carrying the pulleys and 2
the apparatus which shifts the strap fork moveable instead of stationary,
so that it can be moved to any desired position or angle and afterwards
fastened, there being a collar fitted into a hole or bearing in the pro-
jecting part of the hanger, and fastened by the screw u.
In Figs. 12, 12, and 13, I shew an improved mode of fastening the 2
adjustable back stay used in slide lathes.
In the lower part of the slide rest I form a recess v capable of holding
the heads of bolts w, and when the bolts are loosened the stay can be
moved forwards or backwards according to the diameter of the work
being turned, and afterwards held fast by tightening the bolts.
In this description of lathe the cutting or turning tools have generally
been made square, but when desired I can use round steel very effec-
tively by placing the top of the tool in a groove formed in the tripod
or other shaped fastener, and tightly screwing up the nut y; and in
8

page_text: Fig. 14 I shew that this grooved fastener can be used for square tools as
well as round.
In witness whereof, I, the said Andrew Muir, have hereunto
set my hand and seal, this Twelfth day of November, in the
year of our Lord One thousand eight hundred and seventy-
five.
'
Signed, scaled, and delivered by the
within-named Andrew Muir, in
the presence of
G. SEPTIMUS Hughes,
ANDREW MUIR. (L.S.)
Patent Agent,
Manchester.