CERTAIN IMPROVEMENTS IN SELF-ACTING SLIDE LATHES
Year: 1857

page_text: LETTERS PATENT to William Heap, Machinist, Ashton-under-Lyne, in
the County of Lancaster, for the Invention of "CERTAIN IMPROVEMENTS
IN SELF-ACTING SLIDE LATHES."
Sealed the 11th September 1857, and dated the 23rd March 1857.
PROVISIONAL SPECIFICATION left by the said William Heap at the
Office of the Commissioners of Patents, with his Petition, on the 23rd
March 1857.
I, WILLIAM HEAP, Machinist, Ashton-under-Lyne, in the County of Lan-
caster, do hereby declare the nature of the said Invention for "CERTAIN
IMPROVEMENTS IN SELF-ACTING SLIDE LATHES," to be as follows:-
I employ a screw the whole length of the bed, which answers for both
turning and screw cutting. This screw I place in a groove in the bed, so as
to support it throughout its entire length, the nut attached to the slide rest
sliding in the said groove.
For stopping or reversing motion of said screw, I employ a swing frame
with cords and pullies in front of the bed.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Heap in the Great Seal Patent Office on the 22nd
September 1857.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HEAP, Machinist, Ashton-under-Lyne, in the County of Lancaster, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-third day of March, in the year of our Lord
One thousand eight hundred and fifty-seven, in the twentieth year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
William Heap, Her special licence that I, the said William Heap, my executors,
administrators, and assigns, or such others as I, the said William Heap, my
executors, administrators, and assigus, 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 "CERTAIN IMPROVEMENTS IN-SELF-ACTING SLIDE
LATHES," upon the condition (amongst others) that I, the said William Heap,
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 per-
formed, 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 William Heap, do hereby declare the
nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement and accompanying Drawings, that is to say:-
Figs. 1, 2, 3, 4, and 5 represent the lathe in detail. The same letters refer
to the same parts in all the views.
G, G, represents the bed, with a groove from end to end, in which is placed
the long screw S, S, for moving the carriage T, T, on which is placed the tool
rest R²; H, H, the headstocks; L is the oscillating lever, operated upon by the
band R, R, passing over the pulley nut P, for the purpose of stopping or
reversing the screw S, S.
Fig. 4 shews in section through B, B, (Fig. 1) the mode of engaging and
disengaging the half nut n, with the long screw S, S.

page_text: 1st, the form of the bed with three bearing surfaces G, G, G, having a
groove between the middle and front bearing surfaces for supporting the
screw S throughout the entire length of the bed.
2nd, the form and position of the groove for supporting the screw S.
3rd, the arrangement of the oscillating lever L and the screw M for
stopping and reversing the motion of the screw S.
In witness whereof, I, the said William Heap, have hereunto set my
hand and seal, this Twenty-first day of September, in the year of our
Lord One thousand eight hundred and fifty-seven.
WILLIAM HEAP. (L.S.)