IMPROVE- MENTS IN LATHES
Year: 1853

page_text: LETTERS PATENT to Alexander Dalgety, of 76, Florence Road,
Deptford, in the County of Kent, for the Invention of "IMPROVE-
MENTS IN LATHES."
Sealed the 11th March 1854, and dated the 24th September 1858.
PROVISIONAL SPECIFICATION left by the said Alexander Dalgety
at the Office of the Commissioners of Patents, with his Petition,
on the 24th September 1853.
I, ALEXANDER DALGETY, of 76, Florence Road, Deptford, in the
County of Kent, do hereby declare the nature of my said Invention for
"IMPROVEMENTS IN LATHES" to be as follows:-
The top of the bed being cast without the usual opening, its solidity
and strength are much increased. The leading screw and nut are
likewise by this method kept perfectly clean, as it is quite impossible
for any grit or chips to reach it. The two flanges of the bed being
raised higher than the centre allows them to be undercut on their
inner edges for bolting down the poppet head at any required distance.
The sides of the saddle are cast as deep as the bed, and are connected
underneath by a plate of cast iron carrying the nut, which may
be connected or disconnected with the leading screw at pleasure.

page_text: The leading screw has a narrow groove planed nearly its whole
length, and has a mitre wheel which slides upon it, and revolves in
bearings cast upon the under plate of the saddle. By this means the
saddle and all its upper fittings may be brought to any part of the bed
without in any way disturbing the screw, but the screw cannot turn
without carrying the mitre wheel with it. Motion is thus transferred
(by means of other wheels connected with it) to a large wheel on one
side of the saddle. The lower cross slide is made self-acting in the
usual way by throwing a small spur wheel fixed on the end of a double
threaded screw into gear with the larger one. On the end of the screw
of the top slide is fixed a bevil wheel gearing with another working
horizontally, its shaft passing vertically through and connected by a
pair of mitre wheels to a plain grooved rod working parallel to the
double screw already spoken of, and carrying a similar spur wheel on its
end. By this arrangement short screws of any pitch, either conical or
parallel, may be cut, rods turned, holes bored, or work faced, without
any wear on the leading screw or nut, which are thus preserved in good
condition. Near the edge of the circular plate (on which the top slide
can be adjusted to the different angles) is turned a dovetail or under-
cut groove in which the heads of the two pinching bolts move; there is
thus no necessity for the usual slots, which allow chips to pass in, give
but a very limited range, and prevent the top slide being removed with-
out taking out the bolts. The quadrant piece is adjusted and kept in
any required position by means of a tangent screw, which can be
worked by one of the handles of the rest. All the slides are so arranged
that any train of wheels connected with the mandril drives them all at
one speed, and thus removes the inconvenience of frequently changing.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Alexander Dalgety in the Great Seal Patent
Office on the 24th March 1854.
то ALL TO WHOM THESE PRESENTS SHALL COME T

page_text: WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of September, in
the year of our Lord One thousand eight hundred and fifty-three, in the
seventeenth year of Her reign, did, for Herself, Her heirs and succes-
sors, give and grant unto me, the said Alexander Dalgety, Her special
licence that I, the said Alexander Dalgety, ny executors, administrators,
and assigns, or such others as I, the said Alexander Dalgety, my execu-
tors, administrators, and assigns, should at any time agree with, and
no others, from time to time and at all times thereafter during the termi
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 LATHES," upon the condition (amongst others) that I, the said
Alexander Dalgety, by an instrument in writing under my hand and
seal, 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 within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said Alexander Dalgety, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and
by the following statement thereof (that is to say):
The top of the bed being cast without the usual opening, its solidity
and strength are much increased. The leading screw and nut are
likewise by this method kept perfectly clean, as it is quite impossible
for any grit or chips to reach it. The two flanges of the bed being
raised higher than the centre allows them to be undercut on their
inner edges for bolting down the poppet head at any required distance.
The sides of the saddle are cast as deep as the bed, and are connected
underneath by a plate of cast iron carrying the nut, which may be
connected or disconnected with the leading screw at pleasure. The
leading screw has a narrow groove planed nearly its whole length,
and has a mitre wheel which slides upon it, and revolves in bearings
cast upon the under plate of the saddle. By this means the saddle.

page_text: and all its upper fittings may be brought to any part of the bed
without in any way disturbing the screw, but the screw cannot turn
without carrying the mitre wheel with it. Motion is thus transferred
(by means of other wheels connected with it) to a large wheel on one
side of the saddle. The lower cross slide is made self-acting. in the
usual way by throwing a small spur wheel fixed on the end of a double
threaded screw into gear with the larger one. On the end of the screw
of the top slide is fixed a bevil wheel gearing with another working
horizontally, its shaft passing vertically through and connected by a
pair of mitre wheels to a plain grooved rod working parallel to the
double screw already spoken of, and carrying a similar spur wheel on its
end. By this arrangement short screws of any pitch, either conical or
parallel, may be cut, rods turned, holes bored, or work faced, without
any wear on the leading screw or nut, which are thus preserved in good
condition. Near the edge of the circular plate (on which the top slide
can be adjusted to the different angles) is turned a dovetail or under-
cut groove in which the heads of the two pinching bolts move; there is
thus no necessity for the usual slots, which allow chips to pass in, give
but a very limited range, and prevent the top slide being removed with-
out taking out the bolts. The quadrant piece is adjusted and kept in
any required position by means of a tangent screw, which can be
worked by one of the handles of the rest. All the slides are so arranged
that any train of wheels connected with the mandril drives them all at
one speed, and thus remove the inconvenience of frequently changing.
Having thus stated the nature of my Invention, I will proceed to
describe the manner of performing the same.
DESCRIPTION OF THE DRAWING.
Sheet 1, Figure 1, elevation; Figure 2, back elevation of rest;
Figure 3. plan: Sheet 2. Figure 4, longitudinal section; Figure 5,

page_text: chips to reach it. The two flanches a, a, Figure 5, of the bed being
raised higher than the centre b, allows them to be undercut on their
inner edges for bolting down the poppet head at any required distance.
The sides of the saddle a, a, Figures 1, and 2, are cast as deep as
the bed, and are connected underneath by a plate of cast iron carrying
the nut, which may be connected or disconnected with the leading
screw at pleasure. The leading screw 6, Figure 4, has a narrow groove
planed nearly its whole length, and has a mitre wheel c, which slides
upon it, and revolves in bearings cast upon the under plate of the
saddle a. By this means the saddle a, and all its upper fittings may be
brought to any part of the bed without in any way disturbing the screw,
but the screw cannot turn without carrying the mitre wheel c, with it:
Motion is thus transferred (by means of other wheels shown in section,
Figure 4, connected with it) to a large wheel d, Figure 2, at the back
of the saddle. The lower cross slide is made self-acting in the usual
way by throwing a small spur wheel e, e, Figures 2, and 3, fixed on
the end of a double threaded screw into gear with the large one d.
On the end of the screw of the top slide f, ff, f, Figures 1, 2, 3, and
4, is fixed a bevil wheel 9, Figure 4, gearing with another working
horizontally, its shaft h, .passing vertically through and connected by a
pair of mitre wheels i, to a plain grooved rod 1, Figure 3, working
parallel to the double screw already spoken of, and carrying a similar
spur wheel m, Figures 2, and 3, on its end. By this arrangement
short screws of any pitch, either conical or parallel, may be cut, rods
turned, holes bored, or work faced, without any wear on the leading
screw or nut, which are thus preserved in good condition. Near the
edge of the circular plate n, Figure 4, (on which the top slide can be
adjusted to the different angles) is turned a dovetail or undercut groove
o, o, in which the heads of the two pinching bolts move; there is thus
no necessity for the usual slots, which allow chips to pass in, give but a
very limited range, and prevent the top slide being removed without
taking out the bolts. The quadrant piece is adjusted and kept in any
required position by means of a tangent screw p, Figure 6, which can
be worked by one of the handles of the rest. All the slides are so
arranged that any train of wheels connected with the mandril drives

page_text: them all at one speed, and thus removes the inconvenience of frequently
changing them. The remaining portions of the lathe being worked in
the customary way, no explanation is necessary.
I make no claim to the mechanical parts separately, nor do I confine
myself to the details described; but what I claim is, the construction of
the solid bed and combination of parts used therewith, as shewn and
described.
In witness whereof, I, the said Alexander Dalgety, have hereunto
set my hand and seal, this Twenty-fourth day of March, in the
year of our Lord One thousand eight hundred and fifty-four.
Witness,
S. CARPMAEL.
A. DALGETY. (L.S.)