Improvements in Machinery or Apparatus for the Manufacture of Screws.
Year: 1886

page_text: Date of Application, 9th Oct., 1886.
Complete Left, 16th Apr., 1887.
Complete Accepted, 17th May, 1887.
PROVISIONAL SPECIFICATION.
Improvements in Machinery or Apparatus for the Manufacture of
Screws.
We ANDREW MUIR of No. 2 Walbrook in the City of London, Engineer, and
JAMES HUMPHRYS of Leadenhall Buildings, also in the City of London, Engineer
and Naval Architect, do hereby declare the nature of this invention to be as
follows:-
This Invention relates to further improvements upon our invention for which wo
applied for Letters Patent dated September 28th No. 12304, 1886.
In the above named application we describe the grooves in the travelling die as
being cut in the direction of and parallel with the line of its motion and the fixed die
as being placed at such angle as shall give the required pitch of the thread on the
screw to be rolled; now the further improvements are as follows; the grooves in
the travelling die are cut in the direction of the line of its motion and nearly parallel
therewith deviating only to such extent as shall be necessary to give the pitch of the
screw required; the grooves in the fixed die are cut in the same manner as in
the travelling die except that the inclination is reversed i.e. if the inclination of
the
grooves in the travelling die be to the right of the centre line of motion then the
inclination of the grooves in the fixed die will be to the left of the central line.
Date this 0th day of Ontahan 1886
HUGHES & SON,
Of 5, Chancery Lane, London,
Agents for the Applicants.

page_text: COMPLETE SPECIFICATION.
Improvements in Machinery or Apparatus for the Manufacture of
Screws.
We ANDREW MUIR of No. 2 Walbrook, in the City of London Engineer, and
JAMES HUMPHRYS of Leadenhall Buildings also in City of London, Engineer &
Naval Architect, do hereby declare the nature of this said invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This Invention relates to further Improvements upon an Invention for which we
applied for Letters Patent dated September 28th 1886, No. 12304.
In the above application we describe the grooves in the travelling die as being cut
in the direction of and parallel with the line of its motion and the fixed die as being
placed at such angle as shall give the required pitch of the thread on the screw to be
rolled. Now our further Improvements are as follows The grooves in the travelling
die are cut in the direction of the line of its motion and nearly parallel therewith
deviating only to such extent as shall be necessary to give the pitch of the screw
required; the grooves in the fixed die are cut in the same manner as in the travelling
die except that the inclination is reversed, i.e. if the inclination of the grooves in the
travelling die be to the right of the centre line of motion, then the inclination of
the grooves in the fixed die will be to the left of the centre line.
In order that our Invention may be clearly understood, we annex a plan of a
machine for manufacturing screws by rolling between flat dies. On the accompanying
drawings Fig. 1 represents the side elevation of the machine. Fig. 2 the plan of the
table and travelling die. Fig. 3 the plan of the fixed die and support. Fig. 4
transverse section of the machine. A is the bed on which the table B slides. ('is
the travelling die attached to the table B. D is the fixed die attached to a suitable
support E. The plan shows the table and travelling die ready for introducing the
blank. The table and die are advanced by means of suitable gearing and the screw is
rolled between the two dies and the table is brought back again ready for the next
blank.
Having now described and shown how our Invention is performed and carried into
practice, we claim :-
--
The Improvements in machinery or apparatus for the manufacture of screws by
rolling between flat dies as herein shown and described.
Dated this 16th day of April 1867.
HUGHES & SON,
5, Chancery Lane, London,
Agents for the Applicants.