An Improved Machine Tool for Enlarging or Reducing Finger Rings and Watch Barrels.
Year: 1893

page_text: Date of Application, 6th Feb., 1893-Accepted, 1st Apr., 1893
COMPLETE SPECITION
An Improved Machine Tool for Enlarging or Reducing Finger Rings
and Watch Barrels.
We ARTHUR GOUGH PINFOLD and GEORGE VALENTINE PINFOLD of North-
rate, Cleckheaton Yorkshire, Jewellers, do hereby declare the nature of this
nvention and in what manner the same is to be performed, to be particularly
lescribed and ascertained in and by the following statement:—
Our invention relates to machine tools for enlarging or reducing wedding and
other finger rings, watch barrels and the like.
The object of the present invention is to produce a machine tool, by the use of
which, wedding and other finger rings may be either enlarged or reduced without
lamage, and by which, watch barrels may be compressed to their original
dimensions when they have become enlarged or distorted by the breakage of springs
or other like causes.
The machine consists of a suitable base or bedplate and framework supporting a
vertical ram, actuated by a handwheel and screw, or other suitable mechanism, said
rain carrying one or more, of a set of metal discs as required, each disc having a
slight taper of a pitch corresponding with the standard ring stick in general use,
said disc being numbered to agree therewith. On the bedplate of the machine are
placed one or more stout metal plates or blocks having a series of holes bored with
a taper corresponding with the aforesaid discs which are forced thereinto by the
ram.
That our invention may be the better understood we will now proceed to describe
the same with reference to the accompanying drawings in which :-
Fig. 1 shows a side elevation of the complete machine.
Figs. 2 & 3 a plan and edge view respectively of the lower of a pair of the
perforated metal blocks or plates; and
Figs. 4 a plan view of the upper block or plate.
Fig. 5 shows the lower end of the ram drawn to an enlarged scale.
Similar letters of reference denote corresponding parts in all the figures.
a a is the frame of the machine preferably formed in one casting.
is the hand wheel, keyed or otherwise rigidly affixed to the vertical spindle c.
which is screw threaded on its lower extremity and engages in a female thread cut
on the interior of the ram d. The ram d accurately fits in the vertical cylinder e
and can slide freely therein, but is prevented from turning by the set screw or
stud f. which engages in a longitudinal groove g (see Fig. 5 cut in the ram for
that purpose.
hh are two taper discs affixed to the nose of the ram in position for use; i is
the lower of a pair of blocks or plates, placed ready to receive the disc h' when
forced down by the ram; j is the set of taper discs, which are threaded upon the
vertical pink when not in use.
Figures 2 to 4 show the metal blocks or plates; they are each perforated with
taper holes 1, 1, 1, preferably six in number and of graduated sizes to correspond
with the discs j. The lower plate or block i (Figs. 2 & 3) has in its centre the
stout rigid pin or spindle m which projects to a suitable length on each side, one
end of this pin or spindle fits accurately into a hole or socket formed in the bed-
plate of the machine for that purpose; while the opposite end of same fits into the
central hole 'n in the upper plate p (Fig. 4) which is placed above the plate i when
required for use.
Near the periphery of the block or plate i a series of holes o, o, o, are bored, in
which a fixed pin on the bedplate of the machine engages, for the purpose of
On the upper block or
accurately centering and fixing the block or plate for use.

page_text: plate p a corresponding set of holes is bored as shewn at q, q, q, and when the said
plate or block is in its position upon the plate i it is fixed by means of a separate
pin or peg being passed through one of the holes 7 into its corresponding hole in
plate I.
For holding the discs on the noser of the ram da springs is affixed in the
position shown in Fig. 5.
We will now proceed to explain how our invention is used :-
Should it be desired to enlarge a ring, one or more of the discs are passed
through the same until the proper size is obtained, the discs being placed in
succession on the nose of the ram and so forced through the ring into the corre-
sponding hole in one of the plates or blocks i or p. the upper face of said plate or
block forming a bearing surface for the ring during the process of enlargement.
When a ring, watch barrel or the like, as the case may be, requires compression
the taper discs are used in the same manner to force the article to be reduced,
through the taper holes in either or both the plates i or p until the required degree
of compresion is obtained.
Having now particularly ascertained the nature of our said invention and in
what manner the same is to be performed, we declare what we claim is :-
1. The set of taper discs and their corresponding perforated blocks or plates
substantially as hereinabove described, for the purposes specified.
2. The use of the machine, constructed substantially as above described and
illustrated, in conjunction with the discs and perforated blocks or plates as claimed
in the previous claim for the purposes specified.
Dated 6th day of February 1893.
GRAHAM, BINNIE & Co.,
Cliffords Inn, E.C., Agents for Applicants.