Improvements in Grinding Attachments for Lathes.
Year: 1893

page_text: Date of Application, 8th June, 1893-Accepted, 22nd July, 1893
COMPLETE SPECIFICATION.
Improvements in Grinding Attachments for Lathes.
A communication by CHARLES DWIGHT FULLER, of Kalamazoo, in the County
of Kalamazoo and State of Michigan, in the United States of America.
I, ALFRED GEORGE BROOKES of 55 & 56 Chancery Lane in the County of
London, Chartered Patent Agent, 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 :-
The object of this invention is to provide a grinding device that can be attached
to any iron lathe and to drive it directly from the feed shaft of the lathe without
the use of over-hanging countershafts, and to so construct this device that it can
be readily adjusted to grind any of the different kinds of work in the lathe.
I attain these objects by the devices illustrated in the accompanying drawings in
which
Figure 1 is a perspective view showing this invention attached to a lathe, looking
at the lathe from the side on which the operator is at work.
Fig. 2 is a perspective view looking at this device from the opposite side of the
lathe to which it is shown in Fig. 1.
Fig. 3 is an enlarged detail, being an end elevation of the grinding wheel, arbor
and arbor-stand as attached to the lathe, the tool-post and the pulley and belt for
driving the grinding wheel, and also the standard for holding the grinding pulley.
Fig. 4 is an enlarged detail, giving a plan view of the grinding arbor with the
grinding wheels removed, the several pulleys used to drive the arbor, and the
standards used to support these parts and connect them to a lathe.
Fig. 5 is an enlarged detail, being a sectional view on line 5-5 of Fig. 4;
Fig. 6 is an enlarged detail, being a sectional view on line 8-8 of Fig. 4;
Fig.
is an enlarged detail, being a sectional view on line 7-7 of Fig. 4;
Fig. 8 is an enlarged detail, showing the manner of attaching the first driving
pulley to the feed shaft of the lathe and
Fig. 9 is a sectional view, through the centre of the idler pulleys for guiding the
arbor belt.
A whole lathe is not shown in the drawings, only enough to show the manner of
attaching and the relations of the devices comprising this invention, to a lathe.
Similar letters refer to similar parts throughout the several views.
The arbor-stand A is made in the usual manner; to have boxes or bearings for
the grinding arbor to run in. Its base is made with a hole suitable for the tool-
post of the lathe to go through. In this manner the arbor-stand A is made to
pivot to swing or revolve on the tool-post, to bring the arbor and grinding wheels
at different angles with the lathe, in order to do any kind of work it may be desired
to do. The stand is held securely in position, when set in the proper place for
work, by means of wedge b, inserted in the tool-post in the place where the lathe
tools are used.
The main frame B is hinged at its outer lower side, to the plate L, by means of
a hinge and a plate L is bolted on top of the carriage of the lathe and secured
rigidly thereto, while the upper main part of frame B is free to swing forward or
backward to and from the centre of the lathe. The upper part of this main
frame B, has boxes or bearings to receive the counter-shaft D. The grinding
arbor C, is made to run in the bearings or boxes on the stand A and have suitable
collars and nuts on each end for holding the grinding wheels, also a pulley a,
between the bearings, by which it is driven; the countershaft D runs in the boxes
or bearings on the upper part of the main frame B, and has on one end, the
pulley E which drives the arbor C by means of the belt H. On the other end of

page_text: the countershaft D, is a small pulley F which is keyed or secured to the counter-
shaft. This pulley F is driven by the driving pulley P by means of the belt J.
The driving pulley P, runs on the lathe feed shaft N and is so attached to this
shaft, that it is free to slide on the shaft endwise of the same, but is made to
revolve with the shaft by means of a key g, which key is secured to the pulley P,
in a position to run in the groove g¹ in the shaft N. In this manner, the rotation
of the feed shaft N, will revolve the pulley P and drive the countershaft D
through the pulley F and belt J, and the pulley E, which is keyed to one end of
the countershaft D, will drive the grinding arbor A through the pulley a and the
belt H, at the same time, all these devices are free to ride endwise of the lathe, iu
the same manner that the carriage and lathe tools can move on the lathe.
The pulley P, is held in position to move end wise in the proper relation to the
other devices of this invention, by means of the arm R, which is bolted to the rear
end of the lathe apron S. The outer end of this arm R, is made to work on a
groove i, made in the hub in one side of the pulley P, to carry the pulley along
with the apron of the lathe.
The connecting-rod G, is attached to one end of the arbor stand A ; this
connection is made to form a swivel joint in the block d and the head of the stud c,
to allow the connecting-rod G to swing both vertically and horizontally, as shewn
in Fig. 5. The stud c has a thread on one end of it to screw into the arbor
stand A. The opposite end of the connecting link, or rod G, is connected to the
main frame B near its upper part, by means of the arm u which is secured to the
rib m of the main frame B at one end, while its opposite end is provided with a
swivel block z which has a hole through one end to receive the connecting rod G,
while its other end has a stud portion which goes through a vertical hole in the
arm u and has a nut on its lower end to hold it in position, as shown in Fig. 3.
The set collar, is made to slide on the connecting link G, and is adapted to set
inside and against the block z and to hold the main frame B outwardly and away
from the arbor-stand. The belt H always pulls the upper part of this main
frame B toward the centre of the lathe and against this set collar v.
The tightener pulley n, is for tightening the belt. H, and works on the under side
of this belt in front of the pulley E. This tightener pulley has an arm m¹ pivoted
on the base of the main frame B. The coil spring t, connects at one end with the
upper part of this arm m¹; the opposite end of this spring is connected to one
end of the notched lever r, and this notched lever passes through a slot in the
arm s, which arm is bolted at one end of the upper part of the main frame B as
shewn in Fig. 3. In this manner by pulling end wise on the notched lever r and
allowing the notches to drop down and engage with the arm s, the tension is made
to hold the tightener pulley n, against the belt H.
K is the cross feed carriage of the lathe and can be of any of the various forms
used on different lathes for supporting and carrying the tool post. The arbor
stand A rests on top of this cross feed carriage K.
M is the regular lathe carriage which travels lengthwise of the lathe; S is the
apron or lower part of the carriage M; T is the grinding wheel, which is usually
an emery wheel and can be of various forms and sizes, as best adapted to the work
it may have to do. It can be put on either end of the arbor C, and as the arbor-
stand moves with the cross-feed K, forward and backward across the lathe, so will.
the grinding wheel also move to bring it in proper position to do its work. When
it is desired to grind at an angle anything that is beveling or tapering, the grinding
wheel T and arbor-stand A can be thrown around on its pivot or point or tool-
post I, to bring it in any desired position. In this manner the lathe centres can be
ground and trued up, as shown in Fig. 2. When the arbor C is swung around in
this position, the arbor and pulley a, will be running at an angle with the pulley E,
and in order to make the belt H run properly, the idler or mule pulleys, 11, are
placed on the lathe to run on the belt H in a manner to guide the belt and make it
run properly on the pulleys E, and a, as shown in Fig. 2. These idler or mule
pulleys are shewn in section in Fig. 9. There is first a base or stand o, which is

page_text: made to bolt on to the base of the arbor stand A near the tool-post. I. This base
has a stud o¹; secured rigidly in one end, on which the pulley-rest runs.
The top
of this stud o¹, where it projects above the pulley-rest, is turned down smaller, to
receive the block, x. This block, z, has a hole in its lower part to receive the
upper part of the stud, o', and is secured to the stud by means of a set-screw, y
which screws into the block, a, and against the stud o'. In this manner the block
can be turned around on the stud o', and set in any place desired. The upper part
of the block, a, is made beveling and the pin, a is screwed into the beveled face of
this block at right angles with this face, and the pulley, l, is made to run on this
pin, in this manner, it will be seen that when the pulley, x, is revolved on the
stud, o', it will throw this upper idler or mule pulley, around to make it come at
different angles in relation to the pulleys E and a, and with the adjustment thus
provided for, this pulley, l, can be set in the proper position to guide the belt H to
make it run on the pulley a at any of the various angles this pulley may be used,
while the pulley, l, will guide the lower part of the belt H to run properly on the
pulley E.
The tightener, j, is made similar to the tightener a having a similar arm to
revolve upon which arm is pivoted to swing on the opposite end of the frame B,
to that which the tightener, n, works on; This tightener j, is used to run on the
belt, J, to keep that belt of the required tension for doing its work. The operation
is as follows: If the piece to be ground, is a shaft or similar article, the devices
comprising this invention are attached to the lathe in a similar manner to that
shown in Fig. 4. When the lathe is started, the rotation of the feed shaft N, will
cause the grinding wheel to revolve at the proper speed, by means of the various
pulleys and belts shewn in the drawings and before described. The shaft to be
ground can also be rotated at the same time and the grinding wheels adjusted in the
proper position to work against the shaft as both are being revolved, and the
grinding device with the wheel, can be made to travel lengthwise of the shaft and
lathe, by means of the regular feed works of the lathe, in the same manner that
the lathe tool is made to travel, thereby doing regular and active work on the shaft
being ground, from one end to the other or as much of it as may be desired.
When it is desired to grind on a bevel, as shewn in Fig. 2. the arbor-stand A is set
at any desired angle to correspond with the bevel to be ground, and the mule or
idler pulleys 1, 1, are placed in position to work on the belt H, to insure the belt
running properly on the pulley E and a, and the grinding-wheel can be moved
either forward or backwards, sidewise or in any desired way that a lathe tool can
be operated viz. either by means of the regular lathe feed or the hand cranks on
the lathe apron and carriage. When the grinding wheel T, is moved forward or
backward across the lathe, the pulleys a and E, will always be kept at the proper
distance from each other by means of the connecting rod or link G, as before
described; the connecting link drawing the pulley E, forward and backward across
the lathe to correspond to the movement of the pulley, a. If necessary, the
tightener pulley, j, could be held against the belt J, by means of a spring in the
arm of this tightener similar to that in the tightener pulley n, thereby producing
a nearly equal tension on the belt J, at all times when the frame B, and pulley F.
are swinging forward and backward. This grinding device is particularly adapted
to the grinding and turning up of lathe centres as shewn in Fig. 2.
:
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 grinding attachment for lathes, in which the arbor-stand for the grinding:
wheel is attached to the lathe in a position to grind between the lathe centres,
means for rotating the grinding arbor from a driving device located on the regular
feed shaft of the lathe substantially as shown.
2. In a grinding attachment for iron lathes a grinding stand and arbor attached
to the lathe in a position to grind between the lathe centres, a pulley on the grinding

page_text: arbor, and a pulley on the regular feed shaft of the lathe together with suitable
belting running between the said two pulleys to transmit power from the said shaft
to the said grinding arbor substantially as shown.
3. In a grinding attachment for lathes the grinding arbor mounted on a stand
and attached to the lathe in such a manner that it can be moved end wise or cross
wise of the lathe while the grinding is being done, and means for rotating the
grinding wheel and arbor from the same shaft that feeds the lathe carriage and
apron forward and backward on the lathe substantially as specified.
4. In a grinding attachment for lathes, the arbor-stand mounted on the cross-
feed carriage of the lathe in combination with the pulley on the feed shaft for
driving the grinding arbor and an intermediate countershaft and pulleys, between
the driving pulley on the feed-shaft and the pulley on the arbor for increasing
the speed of the said arbor above what it is on the feed-shaft, substantially as
specified.
5. In a grinding attachment for lathes, the arbor stand for the grinding wheel
mounted on a cross feed carriage in combination with the counter-shaft D, mounted
in bearings on a frame which rides on the carriage M, means for rotating the
grinding arbor, which is in the grinding stand, from the counter shaft D, and means
for rotating the counter shaft D, substantially as and for the purposes specified.
6. In a grinding attachment for lathes, the grinding arbor adapted to move
forward and backward with the cross feed of the lathe in combination with the
countershaft D, also adapted to be moved forward and backward in union with the
said grinding arbor. The counter-shaft D, mounted in bearings in the upper part
of a frame B and the said frame B. hinged at its lower part on the lathe in such a
manner as to allow its upper part to swing forward and backward, the belt H for
transmitting power from the counter shaft D to the grinding arbor and means for
holding the counter-shaft D at the proper distance from the grinding arbor to
keep a uniform tension on the belt H when the grinding-arbor is moved forward
and backward, substantially as and for the purposes specified.
7. In combination with the arbor C and the arbor-stand A, the counter-shaft D,
frame B, and connecting rod or link G, for holding the main frame B at the proper
distance away from the arbor-stand A, substantially as specified.
8. The combination of the arbor-stand A, frame B, connecting rod or link G,
swivel joint or block d, on one end of the connecting rod G and arm u, on the
other end of the connecting-rod G, substantially as and for the purposes specified.
9. In a grinding attachment for lathes, an arbor-stand A adapted to pivot and
swing on the tool-post of the cross-feed carriage and the belt H and the pulleys E
and a, in combination with mule pulleys 1, and l', for properly guiding the belt and
directing it to run on the pulleys E, and a, substantially as specified.
10. In a grinding attachment for lathes, the combination and arrangement of
the mule pulley, running on the stand o¹, the block æ, fastened adjustably to the
upper part of the stud o', and the mule pulley 1, running on the pin x. Said pin
projecting from the upper or beveled face of the block x, substantially as and for
the purposes specified.
11. In a grinding attachment for lathes, the combination and arrangement of the
pulleys E, and a, belt H, tightener n, spring t, and notched lever r, substantially
as and for the purposes specified.
12. In a grinding attachment for lathes, the main driving pulley P, located on
the feed-shaft N, in combination with the arm R, said arm having one end bolted
to the feed-carriage or apron while its opposite end, works in a groove i, in the hub
of the pulley P, to control the endwise movement of the pulley P, substantially as
and for the purposes specified.
6th day of June 1893.
WM. BROOKES & SON,
55 & 56, Chancery Lane, London, Agents for the Applicant.