Improvements in and relating to Grindstones.
Year: 1896

page_text: Date of Application, 28th May, 1896
Complete Specification Left, 4th Aug., 1896-Accepted, 5th Sept., 1896
PROVISIONAL SPECIFICATION.
Improvements in and relating to Grindstones.
I, SILAS CHARLES SCHOFIELD of Freeport, County Stephenson, Illinois, U.S.A.,
Manufacturer, do hereby declare the nature of this invention to be as follows:-
The grindstone frame of this invention comprises a horizontal U shaped bar at
the bow end of which is fixed a seat. To each of the free ends is attached a
bearing block for the grindstone spindle. Close to the bearing blocks are pivotted
legs which support the frame near the centre of the grindstone. Two other legs
are pivotted to the U bar between the centre of the grindstone and the seat. All
the four legs are braced diagonally and transversely. The grindstone is turned
from two pedals each connecting through a connecting rod with a crank pin on the
grindstone spindle. The grindstone provided with a square hole at its centre is
secured on its spindle by two wings on said spindle which fit into two opposite
corners of the square hole. To hold the stone laterally the spindle is formed with
a side collar or flange for one side of the stone and for the other side a second
collar or flange is pressed against the stone by a key driven through a slot in the
spindle. The frame may be folded up after taking out or loosening the bolts of
the diagonal braces.
Dated this 28th day of May 1896.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.
Improvements in and relating to Grindstones.
I, SILAS CHARLES SCHOFIELD of Freeport, County Stephenson, Illinois, U.S.A.,
Manufacturer 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 has for object to provide a light, strong and compact grindstone
frame capable of being folded up into a small space for transportation and
storage.
In the accompanying drawing
Fig. 1 is a side elevation of a grindstone and frame (the latter of this invention)
set up in working position.
Fig. 2 is an end elevation looking in the direction of the arrow a, Fig. 1.
Fig. 3 a plan view with the grindstone removed.
Fig. 4 a part sectional view shewing a means for securing the crank shaft to the
grindstone.
Fig. 5 a section on line 5-5 of Fig. 4.
Fig. 6 a section on line 6-6 of Fig. 4.
Fig. 7 a detail view of part of the device for securing the shaft to the stone.
Fig. 8 a part sectional view shewing a modified means for securing the crank
shaft to the grindstone.

page_text: Fig. 9 a side elevation of the frame partly folded down.
A is an iron bar bent to an U shape and provided at the bend with a seat a
secured or clamped to the bend in any suitable manner. Upon the ends of the
bar A are secured bearing blocks B in which is journalled the shaft C of the
grindstone H. These bearing blocks are preferably secured to the bar A by
bolts b, and upon these bolts are pivotted tvo legs D which support the forward
end of the frame. The legs extend a short distance above the bolts b and bear
against the blocks B, thus holding them in the desired position but allowing them
to swing towards the frame when folding up the same. E are two more legs and
are pivotted to the U shaped bar A at e (Fig. 1) and extend downward at a slight
angle to give the necessary stability to the frame. The legs D, E, are suitably
braced by diagonal braces (Figs. 2, 3). A pair of bars E' connect the rear legs É
with the blocks B thus holding them securely in place and forming
a brace
between them and the bar A. A bar el connects the lower ends of the rear legs
and upon this is pivotted a pair of treadles F, G, consisting of straight bars f, g,
(Figs. 1, 3) and diagonal bars f, g, also short pieces f3, 92 (Fig. 3) secured to the
bars f, g, respectively, near their free ends and forming operating pedals. The
free ends of the bars, g), are connected to pitmen rods F¹, G', (Figs. 1, 2) which
engage with the cranks C upon the shaft C.
For attachment to the shaft, the grindstone H is provided at its centre with a
square hole in two of the diagonally opposite corners of which rest two wings c
formed on the shaft C. The sides of the grindstone are usually turned down
smoothly to within a short distance of the centre where they are left rough and in
order to have the shaft true, the same is provided with a flange C¹ a short distance
from one crank (Fig. 4) and this flange bears against a ring slightly convex and
large enough in diameter to bear upon the finished part of the stone. The ring is
provided with a circular groove c² in which the flange C¹ rests. Upon the opposite
side of the stone a collar C is slipped upon the shaft and pressed against the side
of the stone by a key c³ (Figs. 4, 7) passing through a slot in the shaft and into a
pair of the notches et formed in the face c of collar C. There are a number of
these notches of variable depths so that if the stone is thinner than ordinary a pair
of shallow notches are placed in line with the slot in the shaft and if thicker a
pair of deeper uotches are so placed, the collar being wedged tightly against the
stone.
In the modification of Fig. 8 the shaft is provided with two wings fitting into
the corners of the square hole of the grindstone and with a flange and convex ring
bearing upon one side of the stone. On the opposite side is a collar C provided
with two slots through which pass bolts c and connect the collar C with the
flange C. These bolts lie in the other two corners of the square hole.
J is a funnel for moistening the stone. It is supported by a wire bent in the
form of a loopj then twisted about itself and the two ends j¹ carried down to
the front ends of the bearing blocks B where they are held in place by the bolts b.
A guard K is provided in front of the seat to prevent the water flying against the
operator. The guard is supported by a cross piece k having its bent ends bolted
to the sides of the bar or member A by the same bolt which connects the legs E
therewith. The upper end of the guard is bent round the horizontal portion of
a bail k², the ends of which are bent forward as seen in Fig. 3 at k³ and inserted
in the holes a¹ in the bar A. A number of these holes may be provided and one is
also shewn in the bearing block B (Fig. 9) so that as the stone wears down the
guard may be brought near the same.
This construction forms a rigid support for the stone when in use, and for
transportation it may be folded up by simply removing the bolts b' thus allowing
the rear legs to swing backward. The front legs may also be swung about their
pivots in the same direction, the pitmen disconnected from the cranks and swung
underneath the frame and the whole framework folded compact and into a small
space

page_text: 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
1. In a frame for grindstones and the like the combination of the U shaped
bar A provided at its ends with suitable bearing blocks, with legs depending from
said frame and pivotally secured thereto, the forward legs being provided with
extensions above their pivots and adapted to rest against the bearing blocks, and
braces connecting the rear legs with the U shaped bar, substantially as described
and shewn.
2. The combination with a grindstone provided with a suitable shaft and cranks
for its rotation, of the U shaped bar A, bearing blocks B, the pair of legs D
pivotally secured to the U shaped bar and provided with extensions above their
pivots resting against the bearing blocks, a second pair of legs E also pivotted
to the U shaped bar, the braces E' connecting the legs E with the U shaped bar
and the seat a secured upon the U shaped bar, substantially as described and
shewn.
3. The combination with a grindstone provided with a square hole at its centre
of a crank shaft provided with wings adapted to fit into the two opposite angles of
the hole, a flange upon the shaft, a ring substantially larger than the flange and
adapted to bear against the side of the stone, a collar upon the opposite side and
provided with a number of radial grooves of variable depths, a wedge passing
through a slot in the shaft and adapted to pass into said grooves and press the
collar against the side of the stone, substantially as described and shewn.
4. The combination with a grindstone provided with a square hole at its centre,
of a crank shaft, two oppositely arranged wings upon said shaft and adapted to fit
into the two opposite corners of the hole, a flange adapted to bear upon one side
of the stone, a collar upon the opposite side and a suitable tightening device for
clamping the flange and collar against the sides of the stone, substantially as
described and shewn.
Dated this 4th day of August 1896.
THOMAS R. SHILLITO,
89 Chancery Lane, London, W.C., Agent for the Applicant.