Year: 1892

page_text: Date of Application, 26th Jan., 1892
Complete Specification Left, 15th Oct., 1892-Accepted, 3rd Dec., 1892
Figure 6, a vertical sectional view on the line of Figure 4;
Figures 7 and 8, views illustrating in detail the constructing of the grinding wheel,
its guard and driving shaft ;
Figures 9, 10, and 11, views illustrating the construction of the centering
device; and
Figure 12, a sectional view showing the construction and arrangement of the pan
tipping lever and attendant parts.
A, indicates an upright column or standard carrying at its upper end the grinder
shaft or spindle B, and provided on its front face with a large projecting stud C
upon which is mounted the oscillating pan D.
The stud C, which is affixed rigidly to the column, is made circular in cross
section to receive the arms D' formed on the underside of the pan the arms being
accurately fitted to the stud C so as to move lengthwise thereof and oscillate thereon
when permitted or desired. The pan is further provided, on its under face, with ar
ear or ears D in which is pivoted a lever D³, the inner end of which bears upon
the upper face of a lug a formed on the stud arm C, while the outer end projects
outward through a yoke E projecting from the pan as shown in Figures 1 and 2.
Now when the pan is in its normal position (shown in Figure 1) the inner end of
the lever will be resting upon the upper face of the lug, while the outer end will be
resting upon the lower bar of the yoke E as clearly illustrated in Figure 12. If,
when the parts are in this position, it should be found that the pan should be slightly
higher or lower at one end or the other, the outer end of the lever may be raised or
lowered slightly by means of a set screw a' which, as shown in Figures 1, 2 and 1'2,
passes upward through the yoke and bears against the underside of the lever.
When it is desired to tip the pan to carry the tool across the face of the grinder,
it is only necessary to raise the outer end of the lever as shown in Figure 12 by
dotted lines, the inner end of the lever then acting as the fulcrum.
To move the pan and the tool holder carried thereby bodily toward and from the
grinder, a threaded shaft F is employed carrying at its outer end a handle or hand
wheel as shown in Figures 1, 2 and 3. This shaft passes through a threaded
opening formed in the end wall a² of the stud arm C, and is swivelled in a cap
piece F secured to the pan and fitting upon the stud arm as shown in Figure 3.

page_text: Now by turning the shaft, the cap piece will be moved inward or outward,-
according to the direction of rotation of the shaft,-and will carry with it the pan
to which it is secured. In order that this movement of the pan may not cause the
inner end of the lever D³ to ride off the lug a on the stud arm C, the said lug is
made of a length or width greater than the distance travelled by the pan, as shown
in Figure 2.
"
To prevent back-lash or any looseness in the action of the pan-actuating shaft, a
nut or threaded collar F³ is provided, which is applied to the shaft between the
outer end of the arm C and the outer end of cap F2 as shown in Figure 3. Coiled
springs a seated in recesses in the arm C urge the collar or nut away from the end
of the arm, and cause the threads on the shaft to bear snugly against the threads
formed in the end of the arm C. The collar or nut is prevented from turning with
the shaft, by means of a pin or pins a projecting from the collar into the end of the
arm C, as also shown in Figure 3.
As shown in Figures 5 and 6, the pan is provided with guides or ways a³ on the
inner face of its bottom, on which is mounted the tool holder. This tool holder,
which is shown in detail in Figures 4, 5 and 6, comprises, in a general way, a base G,
a circular frame or circle H mounted therein so as to tip or rock in a vertical plane
or on a horizontal axis; an L-shaped frame I mounted upon the circle H so as to
swing horizontally or upon a vertical axis; and finally a second circular frame or
circle J which is carried at the upper end of frame I and adapted to turn or rotate
in a vertical plane, or upon a horizontal axis; the tool to be ground being secured
by devices carried by the circle or circular frame J.
The base G is provided with upwardly projecting ears K which receive the
journals b, upon which latter the frame H and the parts carried thereby may oscillate,
the journals or bearings for frame H constituting what is termed the "clearance
axis."
While the construction shown is preferred, of course the invention is not
limited to the use of the removable studs or journals b.
In order to regulate, control or govern the oscillation of frame H to compensate
for the clearance it is desired to give to the tool by grinding, the said frame is
provided with an arm H' (Figures 4 and 5) having a slot H2 (Figure 2) concentric
with the clearance axis, and through the slot and adjacent portion of frame G, a
bolt H³ is passed upon which screws a handle or lever H*.
The holt has at its inner end a head (preferably made in the form of a nut) and
of course when the handle or lever His turued it will clamp the arm H' firmly in
position against the side of the base G. In lieu of this construction, any of the
common forms of clamps now in use may be used.
In order to determine precisely the angle of inclination given to the frame H, the
free end of the arm His provided with a scale or with gradations as at H³
(Figure 5) which are designed to. be read in connection with a suitable mark or
index on the base G.
The frame or "circle" H which will advisably be made of a single casting,
comprises a central hub H, à ring or circle H having gradations on its upper
face one or more radial arms & to give strength and rigidity to the frame; and
the arm H already referred to.
Into the hub H of the frame I fits a hub I' projecting from the underside of the
horizontal portion of the arm I, as clearly shown in Figure 6,-the lower end of the
hub I being threaded to receive a clamping or retaining ring or uut I², Figures 5
and 6 these devices constituting a vertical axis about which the frame.I may swing
in a horizontal plane.
In order to hold the frame I in its adjusted position, a bolt I³ is employed which
passes vertically through the horizontal part of frame I, and is provided at its lower
end with a lateral head or projection to engage a groove or annular recess I'
formed in the frame or circle H, as shown in Figure 6.
At its upper end the bolt I is threaded to receive a handle 16, by turning which
the bolt head will be drawn up against the upper wall of the slot, and the frame I
will be thereby clamped to the frame H. By throwing the handle or lever 16 around

page_text: in the opposite direction, the head or projection of the bolt will be allowed to fall
away from the upper wall of the groove or slot, and the frame will then be free to
be moved.
The upper wall of the groove or recess I³ is undercut slightly so as to prevent
the bolt from turning with the handle or lever.
In order to determine the angular position or adjustment of the frame I, the
latter is provided with a pointer 17 which, moving over the scale or gradations b
formed on the ring H', shows at a glance whether or not the frame is in such a
position as to present the tool being ground, at the proper angle to the grinder,
This adjustment is employed when grinding the angular faces of tools.
The upper end or vertical portion of the frame I terminates in a band or ring 1ª
in which is mounted the circle or circular frame J, as shown in Figures 1, 2, 4, 5
and 6.
The circle is provided with an annular flange or rim J' which, as clearly shown
in Figure 6, bears against the front face of the ring or band I. The main portion
of the circle projects beyond the rear face of the ring 18 where it is provided with
a ring J having suitable handles J' by means of which it and the said circle I may
be turned or rotated in the frame I in a vertical plane about the axis of the tool as
a centre. This adjustment is employed when grinding the sides and top of the tool,
and in order to hold the circle J in its adjusted positions, the ring or band I³ is
provided with a set screw which, passing through the band, bears upon or against
the main body of the circular frame J, as shown in Figure 6.
In order to determine the angular position of the circular frame J and the tool,
carried thereby, the annular rim Jis provided with gradations as at which, when
read in connection with a pointer or zero marking on the ring or band 18 shows just
the angular position of the circular frame and tool.
Jo indicates a hollow block carrying screws J' by means of which the tool to be
ground is held rigidly in position.
This block fits within an opening in the circular frame J to which it is pivotally
connected by means of vertical studs or journals c, as shown in Figure 6.
The swinging movement of the block is controlled by means of a clamping bolt c¹
which is carried by an arm c² projecting from the block, and projects through a
slot formed in an arm c¹ of the circular frame J, as clearly shown in Figures 4, 5,
and 6.
The rear face of arm is graduated as at c³ (Figure 5) so that the angle given to
the tool may be accurately and quickly determined.
In grinding tools with a round nose the tool is clamped in the block J and then
centred by the centering device L, shown in Figures 6, 9, 10 and 11 (but omitted
from Figures 1, 2 and 4).
This device consists of a stem of rod d passing centrally and vertically through the
hub H in which it is swivelled. The upper end of the stem or rod is provided with a
head or enlargement d¹ having a notch or seat d2 adapted to receive the end of a spring-
pressed pin d³ carried by an arm or rod d of the centering device; the said arın or
rod d' being hinged or pivotted to the head of the rod or stem d so as to swing down
out of the way, as shown in Figure 6.
When the part d is up in its vertical working position, the spring pin will be
seated in the recess and hold the part in position; but owing to the formation
of the seat or recess d², the part may be readily swung down out of the way,-
the bevelled end of the pin readily riding out of the recess.
The upper end of the rod or arm is split and the two parts are drawn together
by a screw or bolt d' so as to clamp and hold the arc-block e carrying the graduated
arc e and lever or pointer e³.
One of the vertical faces of the arm or rod d' is provided with a dovetail groove e²
to receive a corresponding rib et formed on the back face of the arc-block; by means
of which construction vertical adjustment of the arc-block and its pointer or index
relatively to the standard dd' is secured.
The indicator or pointer e³, is pivoted, at a point between its ends, to the upper

page_text: end of the block e, while its lower end works over the graduated are ; a coiled
spring being employed to hold the upper end against the rounded nose of the
tool, during the centering operation, and to return the indicator to its normal
position.
.
The object of using this centering device is to ensure the placing of the centre of
the tool in line with the vertical axis on which the tool holder frame I swings.
After a tool is clamped in the holder, it is adjusted by the screws until the
indicator or pointer e (whose upper face touches the face to be ground) indicates
upon the graduated arc e', the same angle or measurement for all the faces to be
ground, the pointer being applied to each of said faces successively by being
turned upon its vertical axis d. When the tool is thus centered, it is rigidly
clamped in the holder and is ground by swinging the tool holder frame upon its
vertical axis. The flat faces tangential to the round nose may be separately ground
by tipping the pan D and carrying the faces across the face of the grinder. If
clearance is desired the holder is tipped upon the horizontal axis b b.
Where, from the nature of the tool, the latter cannot be mounted within the
block J, a separate tool-holding clamp may be employed, the clamp to which the
tool is secured, being in such case secured to the block.
From the foregoing description it will be seen that the tool when once applied to
the block Je may have four distinct adjustments, namely, (1) An adjustment in a
horizontal plane above the vertical axes ce; (2) An adjustment with the circle J
about its own axis; (3) A horizontal adjustment with the frame about the
vertical axis H I'; and (4) An adjustment in a vertical plane upon the clearance
axis.
If the tool to be ground is bent, the tool box or block J is adjusted or rotated
upon its vertical axis c c. If the tool is required to have a definite amount of
clearance on a face at an angle to its axis, (as is the case with screw threading tools,
for instance) the circular frame H is tipped or rocked upon the clearance axis. To
secure the required horizontal angles the frame is swung around in a horizontal
plane on the axis H 11; and to present the tool to the grinder so as to grind its
different sides, the circle J is rotated so as to turn the tool about its own axis.
From this it will be seen that it is possible to present the tool to the grinder in
almost any position and to grind a number of tools at the same gauge; thereby
ensuring perfect uniformity in the work.
While the machine is of considerable value in any shop for grinding tools, its
advantages are best realised and appreciated when used in connection with a chart
giving the angular adjustments for each standard tool to be ground. The machine
is also particularly well adapted for grinding special tools, as the tool holder can be
set directly to the exact angle of clearance or rake without stopping to calculate
the angles.
In grinding thread-cutting tools the machine is particularly valuable, as any
desired angle of clearance can be obtained on either side of the tool without
changing the top angle.
The grinder M heretofore referred to may be made of emery, corundum, or other
suitable material, and has the form of a hollow frustrum of a cone, with an internal
annular ledge or flange at its sinaller end as shown in Figure 7.
This grinder is secured to the end of the shaft B, journalled in suitable boxes or
bearings N formed on the upper end of the column or standard A. The boxes or
bearings are made tapering to receive conical brasses O threaded at their ends to
receive the adjusting and holding rings P P and Q Q, which latter bear against
opposite faces of the boxes or bearings.
Upon reference. to Figure 7 it will be noted that the brasses are slotted or
divided lengthwise so that when they are adjusted longitudinally through the
conical openings of the boxes, they will be compressed sufficiently to take up the
wear.
The ring Q' is made with a socket in its outer face to receive the rings f, g, h,
which, in connection with the nut k screwing on to the end of the shaft, hold

page_text: the latter in its proper position. A ring i and cap screw into the open end of
the ring Q and exclude the dirt and assist in holding the parts in proper
position.
Between the boxes or bearings there is affixed to the shaft B a driving pulley R
which receives motion from any suitable source of power, while upon the inner end
of the shaft is a collar having an annular flange m.
The smaller end of the grinder is slipped onto the collar and a disc or plate a is
then applied to the outer face of the internal flange of the grinder as shown in
Figure 7.
Between the flange m and the inner end of the grinder; and between the plate u
and the inner face of the grinder flange, is placed a rubber or other elastic washer o,
which pass
and the parts are then secured together by means of screws or bolts
through the plate and into the collar; thereby effectually attaching the grinder to
the shaft.
ע
The grinder works in a housing or casing S which, as shown in Figures 1, 7 and
and 8, is cut away on its front face to allow the tool to be brought into contact with
the grinding surface. This housing is carried by an arm T adjustably secured to
the main frame by means of a set screw or bolt U; and is also provided with a
nipple V to which to connect a water-supply pipe.
Dated this 25th day of January 1892.
WM. P. THOMPSON & CO.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Grinding Tools.
A communication by THE GISHOLT MACHINE COMPANY, of Madison, in the
State of Wisconsin, United States of America.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.I.M.E., of the Agency for
Foreign Patent Solicitors, 6, Lord Street, Liverpool and 6 Bank Street, Man-
chester both in the County of Lancaster and 323 High Holborn in the County of
Middlesex, Civil Engineer, 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 relates to machines for grinding tools, and consists in various
features and details hereinafter set forth and claimed.
In the drawings accompanying the Provisional Specification―
Figure 1 is a front face view of the machine;
Figure 2 a side view;
Figure 3 a sectional view, on a larger scale, of the screw feed for the oscillating
pan and the tool holder carried thereby;
Figure 4 a top plan view of the tool holder removed from the pan ;
Figure 5 a rear face view of the same;
Figure 6 a vertical sectional view on the line -e of Figure 4:
Figures 7 and 8 views illustrating in detail the constructing of the grinding
wheel, its guard and driving shaft ;
Figures 9, 10 and 11 views illustrating the construction of the centering device;
and
Figure 12 a sectional view showing the construction and arrangement of the pan
tipping lever and attendant parts.
A indicates an upright column or standard carrying at its upper end the grinder
shaft or spindle B, and provided on its front face with a large projecting stud C
upon which is mounted the oscillating pan D.
The stud C, which is affixed rigidly to the column, is made circular in cross

page_text: section to receive the arms D₁ formed on the underside of the pan the arms being
accurately fitted to the stud C so as to move lengthwise thereof and oscillate
thereon when permitted or desired. The pan is further provided, on its under
face, with an ear or ears D² in which is pivoted a lever D³, the inner end of which
bears upon the upper face of a lug a formed on the stud´arm C, while the outer
-end projects outward through a yoke E projecting from the pan as shown in
Figures 1 and 2. Now when the pan is in its normal position (shown in Figure 1)
the inner end of the lever will be resting upon the upper face of the lug, while the
-outer end will be resting upon the lower bar of the yoke E as clearly illustrated in
Figure 12. If, when the parts are in this position, it should be found that the pan
should be slightly higher or lower at one end or the other, the outer end of the
lever may be raised or lowered slightly by means of a set screw a' which, as shown
in Figures 1, 2 and 12, passes upward through the yoke and bears against the
-underside of the lever.
When it is desired to tip the pan to carry the tool across the face of the grinder,
it is only necessary to raise the outer end of the lever as shown in Figure 12 by
dotted lines, the inner end of the lever then acting as the fulcrum.
To move the pan and the tool holder carried thereby bodily toward and from
the grinder, a threaded shaft F is employed carrying at its outer end a handle or
hand wheel F1 as shown in Figures 1, 2 and 3. This shaft passes through 'a
threaded opening formed in the end wall a² of the stud arm C, and is swivelled in a
cap piece F secured to the pan and fitting upon the stud arm as shown in Figure 3.
Now by turning the shaft, the cap piece will be moved inward or outward-
according to the direction of rotation of the shaft-and will carry with it the pan
to which it is secured. In order that this movement of the pan may not cause the
inner end of the lever D³ to ride off the lug a on the stud arm C, the said lug is
made of a length or width greater than the distance travelled by the pan, as shown
in Figure 2:
To prevent back-lash or any looseness in the action of the pan-actuating shaft,
a nut or threaded collar F is provided which is applied to the shaft between the
outer end of the arm C and the outer end of cap F2 as shown in Figure 3. Coiled
springs a seated in recesses in the arm C urge the collar or nut away from the
end of the arm, and cause the threads on the shaft to bear snugly against the
threads formed in the end of the arm C. The collar or nut is prevented from
turning with the shaft, by means of a pin or pins a projecting from the collar into
the end of the arm C, as also shown in Figure 3.
As shown in Figures 5 and 6, the pan is provided with guides or ways a³ on the
inner face of its bottom, on which is mounted the tool holder. This tool holder,
which is shown in detail in Figures 4, 5 and 6, comprises, in a general way, a
base G, a circular frame or circle H mounted therein so as to tip or rock in a
vertical plane or on a horizontal axis; an L-shaped frame I mounted upon the
circle H so as to swing horizontally or upon a vertical axis; and finally a second
circular frame or circle J which is carried at the upper end of frame I and adapted
to turn or rotate in a vertical plane, or upon a horizontal axis; the tool to be
ground being secured by devices carried by the circle or circular frame J.
The base G is provided with upwardly projecting ears K which receive the
journals b, upon which latter the frame H and the parts carried thereby may
oscillate, the journals or bearings for frame H constituting what is termed the
"clearance axis." While the construction shown is preferred, of course the
invention is not limited to the use of the removable studs or journals b.
In order to regulate, control, or govern the oscillation of frame H to compensate
for the clearance it is desired to give to the tool by grinding, the said frame is
provided with an arm H¹ (Figures 4 and 5) having a slot H' (Figure 2) concentric
with the clearance axis, and through the slot and adjacent portion of frame G, a
bolt H³ is passed upon which screws a handle or lever H*.
The bolt has at its inner end a head (preferably made in the form of a nut), and
of course, when the handle or lever His turned, it will clamp the arm H' firmly

page_text: in position against the side of the base G. In lieu of this construction, any of the.
common forms of clamps now in use may be used.
In order to determine precisely the angle of inclination given to the frame H,.
the free end of the arm H' is provided with a scale or with gradations as at H³
(Figure 5) which are designed to be read in connection with a suitable mark or
index on the base G.
The frame or circle" H, which will advisably be made of a single casting,
comprises a central hub H, a ring or circle H' having gradations 6' on its upper
face; one or more radial arms to give strength and rigidity to the frame; and
the arm H already referred to.
Into the hub H of the frame H fits a hub I projecting from the underside of the-
horizontal portion of the arm I, as clearly shown in Figure 6, the lower end of the
hub I being threaded to receive a clamping or retaining ring or nut 12, Figures 5.
and 6; these devices constituting a vertical axis about which the frame I may
swing in a horizontal plane.
In order to hold the frame I in its adjusted position, a bolt I³ is employed, which.
passes vertically through the horizontal part of the frame I, and is provided at its
lower end with a lateral head or projection I to engage a groove or annular recess [*-
formed in the frame or circle H, as shown in Figure 6.
At its upper end the bolt I is threaded to receive a handle 16, by turning which.
the bolt head will be drawn up against the upper wall of the slot, and the frame !
will be thereby clamped to the frame H. By throwing the handle or lever 16-
around in the opposite direction, the head or projection of the bolt will be allowed.
to fall away from the upper wall of the groove or slot, and the frame will then
be free to be moved.
The upper wall of the groove or recess I³ is undercut slightly so as to prevent the-
bolt from turning with the handle or lever.
In order to determine the angular position or adjustment of the frame I, the
latter is provided with a pointer 1' which, moving over the scale or gradations bl
formed on the ring H7, shows at a glance whether or not the frame is in such
position as to present the tool being ground, at the proper angle to the grinder..
This adjustment is employed when grinding the angular faces of tools.
The upper end or vertical portion of the frame I terminates in a band or ring [8
in which is mounted the circle or circular frame J, as shown in Figures 1, 2, 4, 5,.
and 6.
The circle is provided with an annular flange or rim J' which, as clearly
shown in Figure 6, bears against the front face of the ring or band 18. The main
portion of the circle projects beyond the rear face of the ring 18 where it is.
provided with a ring J having suitable handles J3 by means of which it and the
said circle may be turned or rotated in the frame I in a vertical plane about the
axis of the tool as a centre. This adjustment is employed when grinding the sides.
and top of the tool, and in order to hold the circle in its adjusted positions, the
ring or baud 1 is provided with a set screw J which, passing through the baud,.
bears upon or against the main body of the circular frame J, as shown in.
Figure 6.
In order to determine the annular position of the circular frame J and the tool,.
carried thereby, the annular rim Jis provided with gradations as at J5 which,.
when read in connection with a pointer or zero marking on the ring or band I³,
shows just the angular position of the circular frame and tool.
Je indicates a hollow block carrying screws J7 by means of which the tool to he.
ground is held rigidly in position.
This block fits within an opening in the circular frame J to which it is pivotally
connected by means of vertical studs or journals c, as shown in Figure 6.
The swinging movement of the block is controlled by means of a clamping
bolt which is carried by an arm projecting from the block, and projects
through a slot 3, formed in an arm c' of the circular frame J, as clearly shown in.
Figures 4, 5 and 6.

page_text: The rear face of arm is graduated, as at e (Figure 5) so that the angle given
to the tool may be accurately and quickly determined.
In grinding tools with a round nose, the tool is clamped in the block J and then
centered by the centering device L, shown in Figures 6, 9, 10 and 11 (but omitted
from Figures 1, 2 and 4).
This device consists of a stem or rod d passing centrally and vertically through
the hub He in which it is swivelled. The upper end of the stem or rod is provided
with a head or enlargement d' having a notch or seat dadapted to receive the end
of a spring pressed pin d³ carried by an arm or rod d of the centering device; the
said arm or rod d being hinged or pivoted to the head of the rod or stem d so as to
swing down out of the way, as shown in Figure 6.
When the part is up in its vertical working position, the spring pin will be
seated in the recess d² and hold the part d in position; but owing to the formation
of the seat or recess d, the part d' may be readily swung down out of the way, the
bevelled end of the pin readily riding out of the recess.
;
The upper end of the rod or arm is split, and the two parts are drawn
together by a screw or bolt d' so as to clamp and hold the arc-block e carrying the
graduated arc e and lever or pointer e³.
One of the vertical faces of the arm or rod d is provided with a dovetail groove e²
to receive a corresponding rib et formed on the back face of the arc-block; by
means of which construction vertical adjustment of the arc-block and its pointer or
index relatively to the standard d d is secured.
The indicator or pointer e³ is pivoted, at a point between its ends, to the upper
end of the block e, while its lower end works over the graduated arc e¹; a coiled
spring being employed to hold the upper end against the rounded nose of the
tool, during the centering operation, and to return the indicator to its normal
position. The object of using this centering device is to ensure the placing of the
centre of the tool" in line with the vertical axis on which the tool holder frame I
swings. After a tool is clamped in the holder, it is adjusted by the screws J7 until
the indicator or pointer ³, (whose upper face touches the face to be ground)
indicates, upon the graduated arc e's the same angle or measurement for all the faces
to be ground, the pointer being applied to each of said faces successively by being
turned upon its vertical axis d. When the tool is thus centered, it is rigidly
clamped in the holder and is ground by swinging the tool holder frame upon its
vertical axis. The flat faces tangential to the round nose may be separately ground
by tipping the pan D and carrying the faces across the face of the grinder. If
clearance is desired, the holder is tipped upon the horizontal axis b b.
Where, from the nature of the tool, the latter cannot be mounted within the
block J, a separate tool-holding clamp may be employed,--the clamp to which the
tool is secured being in such case secured to the block.
From the foregoing description it will be seen that the tool when once applied to
the block J may have four distinct adjustments, viz.: (1) An adjustment in a
horizontal plane above the vertical axes cc; (2) An adjustment with the circle.J
about its own axis; (3) A horizontal adjustment with the frame I about the
vertical axis H 1'; and (4) An adjustment in a vertical plane upon the clearance
axis.
If the tool to be ground is bent, the tool box or block J is adjusted or rotated
upon its vertical axis c c. If the tool is required to have a definite amount of
clearance on a face at an angle to its axis, (as is the case with screw threading
tools, for instance) the circular frame H is tipped or rocked upon the clearance
axis. To secure the required horizontal angles, the frame I is swung around in a
horizontal plane on the axis H I¹ and to present the tool to the grinder so as to
grind its different sides, the circle J is rotated so as to turn the tool about its own
axis. From this it will be seen that it is possible to present the tool to the grinder
in almost any position and to grind a number of tools at the same gauge; thereby
ensuring perfect uniformity in the work.
While the machine is of considerable value in any shop for grinding tools, its

page_text: advantages are best realized and appreciated when used in connection with a chart
giving the angular adjustments for each standard tool to be ground. The machine
is also particularly well adapted for grinding special tools, as the tool holder can be
set directly to the exact angle of clearance or rake without stopping to calculate
the angles.
In grinding thread-cutting tools, the machine is particularly valuable, as any
desired angle of clearance can be obtained on either side of the tool without changing
the top angle.
The grinder M heretofore referred to may be made of emery, corundum, or other
suitable material, and has the form of a hollow frustrum of a cone, with an internal
annular ledge or flange at its smaller end as shown in Figure 7.
This grinder is secured to the end of the shaft B, journalled in suitable boxes or
bearings N formed on the upper end of the column or standard A. The boxes or
bearings are made tapering to receive conical brasses O threaded at their ends
to receive the adjusting and holding rings P P and Q Q', which latter bear against
the opposite faces of the boxes or bearings.
Upon reference to Figure 7, it will be noted that the brasses are slotted or
divided lengthwise so that, when they are adjusted longitudinally through the
conical openings of the boxes, they will be compressed sufficiently to take up the
wear.
The ring Qis made with a socket in its outer face to receive the rings, g, h,
which, in connection with the nut k screwing on to the end of the shaft, hold the
latter in its proper position. A ring i and cap j screw into the open end of the
ring Q and exclude the dirt and assist in holding the parts in proper position.
Between the boxes or bearings there is affixed to the shaft B a driving pulley R
which receives notion from any suitable source of power, while upon the inner end
of the shaft is a collar 4 having an annular flange m.
The smaller end of the grinder is slipped onto the collar 1, and a disc or plate n
is then applied to the outer face of the internal flange of the grinder as shown in
Figure 7.
Between the flange m and the inner end of the grinder, and between the plate n
and the inner face of the grinder flange, is placed a rubber or other elastic
washer, o, and the parts are then secured together by means of screws or bolts
which pass through the plate and into the collar; thereby effectually attaching the
grinder to the shaft.
P
The grinder works in a housing or casing S which, as shown in Figures 1,7
and 8, is cut away on its front face to allow the tool to be brought into contact
with the grinding surface. This housing is carried by an arm T adjustably secured
to the main frame by means of a set screw or bolt U; and is also provided with a
nipple V to which to connect a water-supply pipe.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, as communicated
to me by my foreign correspondents, I declare that what I claim is:
1. In a tool-grinding machine, the combination, with a main frame and a
grinder mounted therein, of a pan provided with a tool-holder, and means for
oscillating or tipping the pan to carry the tool across the face of the grinder.
2. In a tool-grinding machine, the combination, with a main frame and a
grinder mounted therein, of a pan provided with a tool-holder, means for moving
the pan and tool-holder bodily toward and from the grinder, and devices for
oscillating the pan and tool-holder to carry the tool-holder across the face of the
grinder.
3. In combination with standard A, having stud C, pan D, mounted thereon and
provided with a tool-holder, and a lever D³, journalled on the pan and bearing at
its inner end upon the lug on a stud C, whereby when the outer end of the lever is
raised and lowered the pan and its too!-holder will be tipped or rocked upon the
stud C, substantially as described.

page_text: 4. In combination with standard Ay having stud C, pan D, provided with
arms D¹ to receive the stud and with an ear D³, in which is mounted a lever D³,
aluga formed on the stud-arm C to receive the inner end of the lever, and
a yoke E, projecting from the pan to receive the lever, substantially as described.
5. In combination with standard A, having stud-arm C, pan D, mounted
thereon, a cap F2, fitting over the end of arm C, but attached to the pan, and a
screw-shaft F, swivelled in the cap and engaging the stud-arm, all substantially as
shown.
6. In combination with a standard A, having stud-arm C, pan D, mounted
thereon and provided with a cap F2, a screw-shaft F, swivelled in the cap and
engaging the arm C, a threaded collar F³, applied to the shaft, springs ³ between
the collar and, the end of arm C, and a pin a, extending from the collar to the arm
to prevent rotation of the collar, substantially as described.
7. In a tool-grinder, a tool-holder comprising a base, a frame mounted therein
on a horizontal axis, an upright standard journalled in the frame so as to
swing in a horizontal plane, and a circular frame journalled in the upper end of the
standard and adapted to turn or rotate upon the axis of the tool to be ground.
"
8. In combination with base G, the frame H, journalled therein, and provided
with the graduated ring H', and the L-shaped frame 1, journalled on the frame H
and provided with tool-holding devices, substantially as described.
9. In combination with base G, the frame H, journalled therein and provided
with the annular groove 1, the L-shaped frame 1, journalled on frame H. and
carrying tool-holding devices, and a bolt 13, having at its lower end a lateral arm I
to engage the groove and provided on the upper face of a portion of frame I with
a lever 1, substantially as described.
10. In combination with frame H, having hub H, an L-shaped frame 1,
having a hub I to fit the hub H, devices for locking the frames together, and
tool-holding devices carried, by the upper end of the frame 1, substantially as
described.
11. In combination with frame H, an L-shaped frame journalled thereon so as
to swing horizontally, a locking device for the two frames, a ring or circular frame
mounted in the upper portion of frame I and adapted to receive the tool to be
ground, and means for holding the ring in its adjusted position, substantially as
described.
12. In combination with. the frame I, having the band or ring 18, the circular
frame J, journalled therein, and the tool-block J, journalled in the ring, substantially
as described.
13. In combination with the base G, the frame H. journalled therein so as to
rock or oscillate in a vertical plane, a support I, mounted upon the frame H so
as to swing in a vertical plane, a circular frame J, carried by the support and
adapted to turn in a vertical plane, and tool-holder J6, journalled in the ring or
frame and adapted to swing in a horizontal plane, substantially as described.
14. I combination with the base G, the frame H, journalled therein, .the
support I, journalled on frame H, the ring-frame J, journalled in the support I, and
scales or gradations for determining the relative angular positions of the
frames G, H, I and J, substantially as described.
15. In combination with the frame 1, having band or ring 13, the ring or
circular frame J, mounted therein and provided with a flange J, and a ring or
band J, provided with handles J³ and secured to the ring J, all substantially as
shown.
16. In combination with frame I, having the ring J journalled therein, a slotted
arm c, projecting from the ring, a block J, journalled in ring J upon vertical
pivots cc and provided with an arm c² to move over the arm e, and a bolt
carried by the arm and projecting through the slotted arm e substantially as
described.
17. In a tool-grinder, the combination, with a tool-holder and its supporting-
frame, of a centering device for the tool substantially as described.

page_text: 18. In a tool-grinder, the combination, with an L-shaped supporting-frame I,
carrying a tool-holder at its upper end, of a centering device applied to the frame Í
in line with its axis substantially as described.
19. In combination with a tool-holder and its supporting-frame, a centering
device hinged or pivoted, as shown, so as to swing down out of the way.
20. In combination with stem or rod d, provided with head d' and a seat d², an
arm or rod d', pivoted to the rod d and having a spring-pressed pin to enter the
seat d', a block e, carried by rod d, and a pointer or indicator pivoted in the block
substantially as described.
21. In combination with the grooved and slotted rod, the screw or bolt ³, the
arc block e, mounted in the slotted rod, and the pointer and spring, substantially as
described.
22. In a tool-grinding machine, the combination, with the main frame and the
grinder mounted therein, of tool-holding devices adjustable in a vertical plane
about the axis of the tool and in a horizontal plane upon a vertical axis, which, if
extended upward, would touch the centre of the tool to be ground substantially as
described.
Dated this Lith dox of October 1800
WM. P. THOMPSON & Co.,
Agents for the Applicant.