IMPROVED APPARATUS FOR ROUNDING, POINTING, OR SQUARING THE ENDS OF SCREW BOLTS, WHICH INVENTION IS ALSO APPLICABLE FOR OTHER SIMILAR PURPOSES
Year: 1878

page_text: LETTERS PATENT to William Halsall, of Bury, in the County of Lancaster, for
the Invention of "IMPROVED APPARATUS FOR ROUNDING, POINTING, OR
SQUARING THE ENDS OF SCREW BOLTS, WHICH INVENTION IS ALSO APPLICABLE
FOR OTHER SIMILAR PURPOSES."
Sealed the 2nd August 1878, and dated the 4th February 1878.
PROVISIONAL SPECIFICATION left by the said William Halsall at the Office
of the Commissioners of Patents on the 4th February 1878.
WILLIAM HALSALL, of Bury, in the County of Lancaster.
" IMPROVED
APPARATUS FOR ROUNDING, POINTING, OR SQUARING THE ENDS OF SCREW BOLTS,
WHICH INVENTION IS ALSO APPLICABLE FOR OTHER SIMILAR PURPOSES."
My Invention is designed principally for the purpose of finishing the ends of screw
bolts by rounding, pointing, or squaring them either before or after screwing, but it
is also equally applicable for the purpose of rounding, pointing, squaring, tapering,
reducing, or otherwise cutting, to form the ends of rods, bars, tubes, spindles, or
other articles for a variety of useful purposes.
The apparatus is somewhat in the form of a lathe, and consists principally of a
frame or bed having a fixed headstock, carrying a revolving spindle driven by a belt
or by toothed gearing, and a movable headstock carrying a pair of clamps or other
suitable device for holding the bolt or other article to be operated 'on.
On the end of a revolving spindle is screwed a "chuck," in which are three
radial recesses for holding the cutting tools, each provided with a screw for setting
and adjusting the cutting tool to the work required, the three tools all meeting in
the centre, or nearly so.
I may here remark that the cutting ends of the tools must be so formed as to
give the required shape to the end of the bolt, bar, rod, or other article when held
against them. In front of the tools is screwed or fixed a plate or disc, into the
centre of which is screwed a hardened steel bush, having in the centre a hole
J.
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page_text: (slightly bell-mouthed) for guiding and holding the bolt or other article in a central
position whilst being operated on by the revolving cutting tools.
The bolt or other article to be operated on is fixed in the clamp or other holding
device in the movable headstock so that it cannot revolve, and with its end opposite
to the centre of the spindle of the fixed headstock. The movable headstock is then
advanced, the end of the bolt passes into the hole in the steel bush, and is thus
guided and held whilst its end is being formed or cut by the revolving tools.
For some small articles the bush may be dispensed with, and the bell-mouthed
hole may be made in the centre of the steel plate or disc, which must in that case
be hardened.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said William Halsall in the Great Seal Patent Office on the 3rd August
1878.
WILLIAM HALSALL, of Bury, in the County of Lancaster.
" IMPROVED
APPARATUS FOR ROUNDING, POINTING, OR SQUARING THE ENDS OF SCREW BOLTS,
WHICH INVENTION IS ALSO APPLICABLE FOR OTHER SIMILAR PURPOSES."
My Invention is designed principally for the purpose of finishing the ends of screw
bolts by rounding, pointing, or squaring them either before or after screwing, but it
is also equally applicable for the purpose of rounding, pointing, squaring, tapering,
reducing, or otherwise cutting, to form the ends of rods, bars, tubes; spindles, or other
articles for a variety of useful purposes.
Such being the nature and object of my said Invention, I will now proceed to
describe in detail the manner in which the same is to be or may be performed or
carried into practical effect, and in order that the same may be clearly understood
I have annexed hereunto a Sheet of Drawings illustrative thereof, and have marked
the same with Figures and letters of reference corresponding with those in the
following explanation thereof,-
Fig. 1 in the annexed Drawing is a side elevation of the apparatus complete.
Fig.
a front and edge view of the face plate or "chuck" enlarged to quarter
size; Fig. 3 are vertical sections of same.
Fig. 4, face and section of hardened steel bush enlarged to half size. .
And, Fig. 5 are front and edge views of the tools used for rounding, pointing, and
tenoning.
The apparatus is somewhat in the form of a lathe, and consists principally of a
frame or bed a, a, having a fixed headstock b, b, carrying a revolving spindle c, c,
driven by a belt round the pulleys d, d, (or by toothed gearing), and a tool
carriage e, e, carrying a pair of clamps or other suitable device for holding the bolt
or other article ff, to be operated on..
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On the end of the revolving spindle c, c, is screwed a face plate or "chuck" 9.9,
in which are three radial recesses h, h, h, for holding the cutting tools i, i, i; each 4

page_text: provided with a screw k for setting and adjusting the cutting tool to the work
required, the three tools i, i, i, all meeting in the centre, or nearly so.
I may here remark that the cutting ends of the tools (see Fig. 5) must be so
formed as to give the required shape to the end of the bolt, bar, rod, or other article
when held against them. In front of the tools is screwed or fixed a plate or disc l, l,
into the centre of which is screwed a hardened steel bush m, m, having in the
centre a hole (slightly bell-mouthed) for guiding and holding the bolt or other
article f, f, in a central position whilst being operated on by the revolving cutting
tools i, i, i.
The bolt or other article to be operated on is fixed in the clamp or other holding
device in the tool carriage b, b, so that it cannot revolve, and with its end opposite
to the centre of the spindle c, c, of the fixed headstock. The tool carriage b, b, is
then advanced by means of the rack and pinion n, n, and, winch handle o, o; the
end of the bolt ff, passes into the hole in the steel bush m, m, and is thus guided
and held whilst its end is being formed or cut by the revolving tools i, i, i.
For some small articles the bush may be dispensed with, and the bell mouthed
hole may be made in the centre of the steel plate or disc 1, l, which must in that case
be hardened.
Having now described the nature and object of my said Invention, together with
the manner in which the same is to be or may be performed or carried into practical
effect, I wish it to be understood that I claim as my Invention, the general arrange-
ment and construction of the apparatus, substantially as herein-before described and
represented on the Drawings annexed, and more particularly I claim the construction
of the face plate or "chuck" 9, 9, for holding the cutting tools i, i, i, together with
the bell-mouthed bush m, m, for guiding the end of the bolt or other article against
the cutting tools.
In witness whereof, I, the said William Halsall, have hereunto set my hand
and seal, this First day of August, in the year of our Lord One thousand
eight hundred and seventy-eight.
WILLIAM HALSALL. (L.S.)