improvements in Machinery for grinding
Year: 1887

page_text: Date of Application, 6th Dec., 1887
Complete Specification Left, 6th Sept., 1888
Complete Specification Accepted, 9th Nov., 1888
This invention of improvements in Machinery for grinding, refers more particularly
to the grinding of articles which require a reciprocating motion, to produce the best
result, and I attain this object in the following manner.
I construct a grinding Machine, in which the grindstone is supported by a suitable
axle and bearings, above the work to be operated upon.
Under the stone I support a bed frame, by means of strong vertically supported
screws, which when caused to revolve by suitable gearing and a hand wheel, raise or
lower the bed frame, to or from the stone, according to the direction in which they
are turned.
Upon the said bed frame a sliding bed is fitted, capable of a longitudinal motion to
and fro under the stone, and adjustable in its length of travel; prefer to support it
upon rollers, on which it travels backwards and forwards, but if preferred for some
purposes it may work in or upon solid bearings.
Upon the sliding bed 1 fit a table, on which the articles to be ground are placed,
and to this table a lateral sliding motion can be imparted, by means of a rack fixed
across its underside, into which a pinion is geared, and which can be operated by a
pinion shaft carried by the sliding bed, through the agency of a hand wheel and
gearing.
To move the sliding bed automatically, I attach to it (at the back) a long connecting
rod, which is secured at its other end to a slotted arm upon a
rocking shaft fixed in
supports at the extreme back of the machine; and to which a rocking motion is
given by means of a shorter connecting rod, with means of adjustment, and driven
by suitable gearing and pullies.
The work to be ground is placed upon the table, and passed under the stone to and
fro by the reciprocating motion of the sliding bed; it is brought into contact with
the face of the stone, by means of the strong vertical screws before mentioned, and

page_text: the required pressure is also given by the said screws; being controlled and regulated
by the workman through the medium of the Hand wheel hefore described. While the
articles are being ground, by being drawn backwards and forwards under the stone, a
cross traverse can be given to the table, causing the articles to travel from side to side
of the stone, so as not to wear the stone in ridges and hollows.
If tapered or curved work is required to be ground, a former or templet of corre-
sponding shape or curve, is attached to the sliding bed in such a manner, that in
passing over the antifriction rollers, the sliding bed will be raised or lowered according
to the shape or configuration of the templet.
Dated the 5th day of Decemben 1887

page_text: I JOHN MCGREGOR of Newhall Road, Sheffield in the County of York, Manager
do hereby declare the nature of this 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 of improvements in Machinery for grinding, refers more particularly
to the grinding of straight or curved articles which require a reciprocating movement
to produce the best result, and I attain this object in the following manner.
I construct a grinding machine in which the grindstone is supported by a suitable
axle and bearings above the work to be operated upon, and in order that my said
invention may be clearly understood, I have illustrated the same in the annexed sheet
of drawings, in which,
Fig. 1, shows a side elevation of a machine constructed according to my invention.
Fig. 2, shows the end view of same.
Fig. 3, shows a reversed plan of a mechanical arrangement for grinding curved
blades, or the like.
The general framework is marked A, the stone B, and the driving pulley C.
Under the stone B, I support a bed frame D, by means of screw threaded lugs or
nuts E, on strong vertically supported screws F, by which also it can be raised and
lowered to and from the under face of the stone as required; this is accomplished by
means of a conveniently placed hand wheel G, and the bevil wheels H, one of which
is fixed upon each screw.
By this arrangement the work can be brought into contact with and withdrawn
from the stone, and the required pressure put upon the work by the attendant.
Upon the said bed frame D, a sliding bed I is fitted capable of a longitudinal move-
ment under the stone, and adjustable in its length of travel; it may be supported
upon antifriction rollers, and for grinding irregular curved articles, a corresponding
"former" or "path" may be placed underneath the said sliding bed to raise it to
the stone as required to follow the shape; it may if preferred work on flat or in
V bearings.
On the sliding bed I fit a table J, on which the articles are placed, and held, and a
lateral sliding motion can be imparted to the table by means of a rack and pinion
fixed to its underside and which is operated by means of a hand wheel K and an
intermediate worm and worm wheel.
To move the sliding bed I automatically, a long connecting rod L is attached to it
at the back end, its other end being secured to a slotted arin M, fixed upon a rocking
shaft N, carried in supports O, at the back of the machine; the rocking motion to
the shaft N, and longitudinal motion to the sliding bed I is given by a shorter rod P
attached to a depending arm Q driven by a slide block and an adjustable eccentric
pin fixed on the face of a geared wheel R, the corresponding pinion and pulley being
shown at S.

page_text: The work to be ground is fixed upon the table J, and is passed under the stone
backwards and forwards by the action of the sliding bed; it is brought into contact
with the face of the stone, by means of the vertical screws F before mentioned, and
the required pressure against the stone is regulated and controlled by the attendant
through the agency of the Hand wheel marked G.
While the articles are being ground, and the sliding bed is in action, a cross traverse
motion can be given to the table by turning the hand wheel K, so that the articles
will traverse across the face of the stone obliquely, or they may be moved sideways to
different positions to prevent the face of the stone wearing unequally.
The arrangement shown in Fig. 3 is for grinding curved blades or other like
articles on a machine similar to that above described, the drawing shows the under-
side of the travelling bed I, with a table J, fitted with rack and pinion, and hand
wheel K.
The article to be ground, such as a curved blade Tis secured to a swivelling plate U,
having a guide pin V, working in a slot or groove W, or against a curved face, or
guiding surface, shaped to correspond with the configuration of the blade, and fixed
to the sliding bed, in such a manner that when the table is caused to move sideways
the guide pin passing along the slot, or other path, carries the plate U round upon its
axis and brings the curved edge of the blade into the desired position against the face
of the stone.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1st. The mechanical arrangement, and combination of the various parts of a
machine for grinding purposes, substantially as hereinbefore described and as shown
in Figs. 1 & 2 of the drawings.
2nd. In combination with a grinding Machine as herein before described, an appliance
for grinding curved blades, and other like articles, substantially as described and
shown in Fig. 3.