Year: 1890

page_text: Date of Application, 6th May, 1890-Accepted, 23th June, 1890
pyramidal blanks.
Figure IV is an end view of fig. 3.
Figure V is a view showing irregular form of blank for pen holder.
Figure VI shows a vertical section of the grinding wheel.
The construction of this machine is similar to a slide lathe and consists of a
frame 1, supporting the head 2 of the machine and the slide 3, upon which the
carriage 4 and 5 move.
The position of carriage 4 upon the slide is controlled by the threaded_rod 6,
which passing through a threaded lug on carriago 4 is operated by hand wheel 7.
The carriage 5 upon the carriage 4 is moved at right angles by the toothed wheel 8,
upon the rod 9 operated by lever 10 engaging with the toothed rack 11 upon the
underside of the carriage 5. Still another carriage, or rather work holder 12, upon
the carriage 5 carries the work in jaws 13 and 14 and is capable of being swung
upon pivot 15 being guided, and locked in its proper place by bolts 16, 16 in
slots 17.
The jaws 13 and 14 are both removable and may be replaced by jaws of larger or
smaller size as required.
The upper jaw 13 is bolted at 18 as shown, to the vertical slide 19, upon the
carriage 12 and is operated by the screw 20. The lower jaw 14 automatically adjusts
itself to the angle of the irregular piece of work placed therein and clamps it against
the upper jaw 13 by wedging as shown in figure 4. The result is accomplished by
forming a segmental concave seat 21 in the carriage 12 below the jaw 13 and
having the lower edge of the jaw of a corresponding concave shape to fit therein, a
siddewise movement being prevented by a tongue 22 in the channel 23. The jaws are
cut out as at 24 on the corner or edge to hold the work more securely.
By means of the aforementioned lever 10, rod 9 and gear 8 connected with the
carriage 4 by rack 11, said carriage 4 and all thereon moves horizontally across the
face of an emery wheel 25 bolted or otherwise secured to a face plate 25" on
the shaft 26 journaled at 27 on the head 2. Said shaft is rotated by pulleys 28 and
belt 29.
This enery wheel is preferably made hollow merely forming a ring as shown in
dotted lines in figure 4 as well as in vertical section in figure 6 and the work is run
[Paine 621

page_text: The central
across one side only thereby saving time and material as, if the omery whool were
solid, the work would have to pass all the way across to make it even.
point of the wheel being least worn away woul! project the furthest.
The advantages of using this machine are obvions; as skilled labour may be done
away with and consequently expense and the amount of work performed by tho
machine is many times greater than that done by a workarin in a given time.
The tendency of the material being worked upon to le hollowed out by the convex
shape of the grind stone is completely obviated by my present construction.
In grinding a blank down from the rough strip of shell it is necessary to reduce
the thickness one half or more. This has formerly taken considerable time and
attention whereas in my improvement a single movement across the face of the emery
wheel removes all surplus material and leaves the blank of a uniform thickness thus
saving valuable time and material as blanks are often ground too thick requiring to
be ground down afterwards, or too thin to be of any use.
Huving now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed 1 declare that what
1 claim is :-
1. In a machine for grinding pearl, ivory etc., the combination of the earringes
adapted to move horizontally and transversely with a third carriage or work holder
pivotally supported in the other carriages so as to operate, «ubstantially as and for the
purposes set forth.
2. In a machine for grinding pearl, ivory, etc., the combination of the carriages 4,
5 and 12 adapted to move longitudinally transversely and pivotally, as and for the
purpose described.
3. In a machine for grinding pearl, ivory, etc., the combination of a pivotally
adjustable work-holder 12 (having thereon the vertically sliding jaw 13 and the
automatic clamping jaw 14) and a hollow emery or grinding wheel to operate on work
held in snid jaws, substantially as described.
4. In a machine for grinding pearl, ivory etc., the combination of the carriages 4,
5 and 12, a fixed jaw 13 and an automatically adjusting and clamping jaw 14 upon
carriages 12, as and for the purposes set forth.
5. In a machine for grinding pearl, ivory, etc., the combination of the carriages 4,
5 and 12, a fixed jaw 18, an automatically clamping jaw 14 upon the carriage 12,
and a hollow emery or grinding wheel to operate on work held in said jaws as and
for the purposes set forth.
6. A machine for grinding pearl, ivory, etc., consisting of the lower carriage 4
adapted to move in one direction, and another carriago sliding in ways thereon and
adapted to move at right angles to the sail lower carriage with a third and upright
carriage or work holder pivotally supported on the lat named carriage, the suid
work-holder being provided with a vertical sliding jaw and an automatically adjust-
able clamping jaw, in combination with a grinding wheel arrangud substantially as
shown and described, and adapted to grind the work when the transversely moving
carriage is pushed forward, and to operate so as to thrust the work further into the
jaws if there is any tendency for it to become loosened, substantially as set forth and
described.
Daind this 5th day of Mov 1890.
H. D. FITZPATRICK,
70, Wellington Street, Glasgow.