IMPROVE- MENTS IN SLIDE SURFACING AND SCREW CUTTING LATHES.”
Year: 1875

page_text: LETTERS PATENT to Thomas William Beverley, Engineer and Tool
Maker, of the Firm of Beverley and Terry, Special Tool Works,
Sheffield, in the County of York, for the Invention of "IMPROVE-
MENTS IN SLIDE SURFACING AND SCREW CUTTING LATHES.”
PROVISIONAL SPECIFICATION left by the said Thomas William
Beverley at the Office of the Commissioners of Patents, with
his Petition, on the 22nd March 1875.
I, THOMAS WILLIAM BEVERLEY, Engineer & Tool Maker, of the
Firm of Beverley & Terry, Special Tool Works, Sheffield, in the County
of York, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN SLIDE SURFACING AND SCREW CUTTING LATHES," to be as
follows:-
"
The first part of my improvements relate chiefly to that class of lathes
known as gap" lathes, and consist in constructing the "bed" in one
or more parts in such manner that the part upon which the fast "head-
stock" is placed will be lower than the part upon which the "saddle"

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas William Beverley in the Great Seal Patent
Office on the 18th September 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
WILLIAM BEVERLEY, Engineer and Tool Maker, of the Firm of Beverley
and Terry, Special Tool Works, Sheffield, in the County of York, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-second day of March, 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 suc-
cessors, give and grant unto me, the said Thomas William Beverley, Her
special licence that I, the said Thomas William Beverley, my executors,
administrators, and assigns, or such others as I, the said Thomas
William Beverley, 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 SLIDE SURFACING AND SCREW CUTTING LATHES,"
upon the condition (amongst others) that I, the said Thomas William
Beverley, 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 within six calendar months next and
immediately after the date of the said Letters Patent.
NOW KNOW YE, that I, the said Thomas William Beverley, 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 and accompanying Sheet of Drawings
(that is to say) :—
The first part of my improvements relate chiefly to that class of lathes

page_text: "
known as "
gap "lathes, and consist in constructing the "bed" in one
or more parts in such manner that the part upon which the "fast
headstock' is placed will be lower than the part upon which tho.
"saddle" and "loose headstock are placed, and to dispense with the
ordinary bend or curve of "bed," which has heretofore been made to
form the "gap." I am thus enabled to have a much larger or higher
centre fast headstock" to a smaller sized centre lathe than has been
before accomplished by the ordinary way of again raising the surface of
the "bed"after the " gap" or on the "fast headstock" part. By
having the "fast headstock " larger, and so arranged on the lower part
of the bed, I am enabled to have a considerable larger size of " cone
pulley or driving source of increased power, and at the same time to
have the "double" or second " gear" brought under the lathe spindle,
if desirable.
"
The second part of my Invention relates to the "double" or second
gear," and consists in dispensing with the long barrel with pinion cast
on one end heretofore employed, and in place of it I have the large
wheel and pinion attached close together, and revolving loosely or freely
upon an eccentric bush or shaft for putting the wheels in and out of
gear, which said bush revolves freely upon a stud fixed at one end of the
"fast headstock." When a shaft is employed it is of suitable length,
and supported by a fixing or bracket, no shaft or protrusion passing the
cone pulley. By this arrangement of double " gear" I am enabled to
have the strap for driving the said cone coming on to or leaving the
cone at any angle.
The third part of my Invention relates to the self-acting sliding and
surfacing arrangement, and consists in bringing the "traverse" shaft
for sliding and surfacing which has heretofore been placed at the back
of the lathe to the front, by which means dispensing with the long
hollow screws and other necessary appliances which have had to be
employed for conveying motion from the said "traverse" shaft when at
the back to the front of the "saddle." By thus bringing the "traverse”
with worm which drives the gearing of the slide and surfacing motions
to the front of the lathe I am also enabled to have all the gearing
required contained in a bracket or brackets on the front of the "saddle."
When the lathe is required or made for sliding, surfacing, and screw
cutting, I dispense entirely with the said "traverse" shaft as a separate
shaft, and use instead the screw, which has a groove running longitu-

page_text: dinally in it, which is made to carry the worm before alluded to for
working the sliding and surfacing motions, and the said screw thus takes
the place of or operates in the manner that the " traverse" shaft would
at such times as the sliding and surfacing motions are being used.
When the screw cutting motion is required the screw is attached to the
"saddle" in the ordinary manner, but does not interfere with the
gear for sliding and surfacing,
In order that my Invention may be more clearly understood I have
hereunto annexed one Sheet of Drawings, and have marked the same
with figs. and letters of reference.
Figs. 1, 2, and 3 are views of such parts of a lathe for sliding, surfacing,
and screw cutting as are necessary to illustrate my Invention; Fig. 1 is
a front longitudinal elevation; Fig. 2, an end elevation; and Fig. 3, a
sectional end elevation of the higher part of "bed" or gantry,"
with loose head," "
saddle," and necessary appliances for motions
required.
"
At Figs. 4 and 5 I have shewn views of an ordinary sliding, surfacing,
and screw cutting lathe. A, Figs. 1, 2, and 3, is the "bed" or "gantry,"
and which I have here shewn as constructed in two parts. The part
upon which the "fast headstock "B is placed is lower than the other
part upon which the "saddle" and "loose head" are placed, and the
ordinary bend or curve which has heretofore been made to form the
"gap" A in Fig. 4 is entirely dispensed with.
"
It will be observed on reference to Fig. 4 that the "fast head-
stock on this bed is on the same plane as the "loose headstock" B
and "saddle" C, whereas in Fig. 1 the headstock B is considerably
higher, whereby larger cone pulleys can be employed, and consequently
extra belt power, and by which means a proportionately increased
amount of work can be accomplished over ordinary lathes the same
centres would. The "bed" or "gantry" may be cast all in one piece,
and so formed according to my Invention, but I prefer to cast the same
in two or more pieces for convenience in large size lathes.
The second part of my Invention relates to the "double" gear, the
wheel C and pinion D, of which I arrange at the back and underneath the
cone pulleys E upon a short shaft F, supported at one end by a bracket
or pedestal G, or I may use a bush and stud instead of the short shaft F,

page_text: as herein shewn, as slight modifications may be made; but what I claim
as of my Invention is,―
Firstly. The construction and arrangement of the "bed "or" gantry,"
so as to obtain increased size of "fast headstock" and driving or extra
belt power, as and for the purpose herein fully described.
Secondly. The arrangement of the "double gear," as herein fully
described and illustrated.
Thirdly. The arrangement of " traverse" shaft and gearing appliances
for sliding and surfacing, as herein fully described.
Lastly. The general construction, combination, and arrangement of
mechanism as comprised under the several headings or parts, and set forth
as my improvements in the above description and fully shewn in the
Drawings.
In witness whereof, I, the said Thomas William Beverley, have
hereunto set my hand and scal, this Fourteenth day of September,
in the year of our Lord One thousand eight hundred and seventy-
five.
THOMAS WILLIAM BEVERLEY. (L.S.)
Witness,
W. WHITEHEAD,
Patent Agent,
Halifax & Sheffield.