IMPROVEMENTS IN DIAMOND MILLSTONE DRESSING MACHINES
Year: 1874

page_text: LETTERS PATENT to George Haseltine, of the "International Patent
Office," Southampton Buildings, London, Doctor of Laws, for the
Invention of "IMPROVEMENTS IN DIAMOND MILLSTONE DRESSING MACHINES."
- A communication from abroad by Daniel Larer. and Samuel
Everett Griscom, both of Pottsville, Pennsylvania, United States of
America
Sealed the 15th May 1874, and dated the 31st March 1874.
COMPLETE SPECIFICATION filed by the said George Haseltine at the
Office of the Commissioners of Patents, with his Petition and
Declaration, on the 31st March 1874, pursuant to the 9th Section.
of the Patent Law Amendment Act, 1852.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
HASELTINE, of the "International Patent Office," Southampton Build-
ings, London, Doctor of Laws, send greeting.
WHEREAS I am in possession of an Invention for "IMPROVEMENTS
IN DIAMOND MILLSTONE DRESSING MACHINES," and have petitioned Her
Majesty to grant unto me, my executors, administrators, and assigns,

page_text: Her Royal Letters Patent for the same, and have made solemn Declara-
tion that it has been communicated to me from abroad by Daniel
Larer and Samuel Everett Griscom, both of Pottsville, Pennsylvania,
United States of America.
NOW KNOW YE, that I, the said George Haseltine, do hereby
declare that the following Complete Specification, under my hand and
seal, fully describes and ascertains the nature of the said Invention, and
in what manner the same is to be performed, in and by the following
statement, reference being had to the accompanying Drawing forming
a part of this Specification :-
This Invention consists in the combination of a bed plate; a frame
sliding longitudinally thereon; another frame sliding transversely on
the said longitudinally sliding frame, and carrying a diamond holder;
a feed screw, whose rotation imparts to the said last-mentioned frame a
transverse movement; a rocker pawl and ratchet to rotate the said feed
screw; latches to engage with the rocker; and a set screw to adjust the
throw of the said rocker at the moment of its disengagement from the
said latches, all as herein-after described.

page_text: side of the said rocker. Its lower end forms a toe m, as shewn in Figures
1 and 2, which engages with the latches V, W, as herein-after described.
To its lower arm is pivoted one end of the rod P, the other end of which
passes through a bearing Q on slide B. A spiral spring p surrounds
the rod P, and presses against Q and the lower arm of rocker M, so as
to keep the rocker in the position shown in Figure 1. The pawl N may
be set so that either end shall engage with the ratchet L; or it may be
set entirely out of gear with said ratchet, being retained in either
position by the spiral spring R, which rests in a recess in a lug on
rocker M, and supports a plate S, which bears against the dog O; Tis
a set screw working in a bearing U on slide B, and acting as a stop to
limit the movement of the rocker; V, W, are weighted latches pivoted
to the bed plate.
The operation of this machine is as follows:-The slide B being at
that end of the bed plate shown at the left-hand in the Drawing, and the
pawl N being in the position shown in Figure 1, the operator moves the
slide B by means of the handle I to the opposite end of the bed plate,
adjusting the wheel H to regulate the depth of the cut made by the
diamond, the toe m passing over the latches V, W, without catching in
them. As the operator begins the return stroke, the said toe engages.
with latch W, which holds and turns the rocker as the slide B advances,
the pawl slipping over the teeth of the ratchet until the rocker has
turned far enough to disengage the toe. The rocker is then instantly
returned to its former position by the spring p, which movement causes
the pawl to rotate the ratchet and feed screw, thereby moving the
carriage D transversely, so that the cut made by the diamond during
this stroke is parallel to the previous cut. The latch V gives the
carriage a similar transverse movement at the completion of this stroke,
and the operator continues to reciprocate the slide, cutting a groove at
each stroke, until the diamond has gone over the whole width of the field.
The pawl is then changed to the opposite position, the bed placed over
the next field and the operation repeated, the pawl turning the ratchet
while the latch turns the rocker, and slipping over the teeth as the
spring p brings the rocker back, so that the feed is now in the opposite
direction, and the carriage D moves gradually to its former position.
The operation is thus continued, changing the pawl whenever the
machine is shifted to a new field, until the whole stone has been dressed.
The distance between the cuts may be varied by means of the screw T,

page_text: which limits the throw of the rocker, and consequently the rotation of
the ratchet. By shortening the stroke the cuts may be made as short as
desired. In this case, as only one latch operates, the diamond makes'
two strokes for each cut.
To level the bottom of a furrow the pawl is thrown out of gear, the 5
machine so placed as to bring the diamond into the furrow, and the slide
reciprocated as above described. For this work I prefer to change the
diamond holder, putting in one with a larger diamond.
Having thus fully described the said Invention as communicated to
me by my foreign correspondents, and the manner of performing the 1
same, I wish it understood that I claim, the combination of the bed
plate, longitudinally sliding frame, transversely sliding diamond carrier,
feed screw, ratchet, rocker, pawl, latches, and set screw as herein set
forth and for the purpose specified.
In witness whereof, I, the said George Haseltine, have here- ]
unto set my hand and seal, this Thirty-first day of March, in
the year of our Lord One thousand eight hundred and seventy-
four
Witness,
HENRY J. NOONE,
8, Southampton Buildings,
London.
GEORGE HASELTINE. (L.S.)