Improvements in Ball-grinding Machines.
Year: 1890

page_text: Date of Application, 1st July, 1890-Accepted, 2nd Aug.. 1890
COMPLETE SPECIFICATION.
[Communicated from abroad by CHARLES EDWIN GOULD, of Leominster, Worcester,
Manufacturer, GEORGE WASHINGTON WEEKS, of Clinton, Worcester, Manu-
facturer, WILLIAM SUMNER REED, FRANK HENRY COOK, and CHARLES EDWIN
DRESSER, of Leominster, Worcester, Manufacturers, and GEORGE DIXTER
BURTON, Manufacturer, of 194, Washington Street, Boston, Suffolk, all in the
State of Massachusetts, United States of America.]
Improvements in Ball-grinding Machines.
I HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co. Patent Agents,
45 Southampton Buildings, in the County of Middlesex, 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 :-
My invention relates to grinding machines which are especially adapted for
grinding spherical rolled forgings; and it consists in certain novel features hereinafter
fully set forth the object being to produce a simpler cheaper and more effective
device of this character than is now in ordinary use.
The nature and operation of the improvement will be readily understood by all
conversant with such matters from the following explanation.
In the accompanying drawings
Figure 1 is a side elevation of my improved ball-grinding machine;
Figure 2, is a plan view of the table or ball holder enlarged.
Figures 3, 4, 5 and 12 are plan views and edge elevations respectively of the
adjustable holder plates detached.
Figures 6 is a central vertical transverse section of the table, the grinding disc
being shown as broken off.
Figure 7 is an end elevation showing the hand-wheel and ratchet of the grinding.
worm.
Figures 8 and 9 show a side elevation and plan respectively of the eccentric
adjusting screws detached ; and
Figures 10 and 11 show a plan and edge view respectively of one of the outer
face or holder-plates detached.
Like letters and figures of reference indicate corresponding parts in the different
figures of the drawings.
A represents a vertical standard which comprises the body of the machine and
supports the working parts.
A diagonally arranged arm a, projects laterally from the top of the body A its
upper face being grooved longitudinally to form a rim or way in which a carriage B,
is fitted to slide. This carriage is provided with two vertical standards, each
bearing a journal d at its top, in which a shaft f, is fitted to rotate the said shaft
being arranged in parallelism with the diagonal body arm a.
The worm
In the outer end of the arm a, a worm g, is fitted to revolve and passes through a
aut secured to the carriage B, and adapted to travel on said worm.
is provided with a hand-wheel i, at its upper end and with a ratchet j, with which a
spring pawl k, on the arm a, engages.
n,
A pulley m is secured to the shaft between the journals d, and a driving belt
passés over said pulley. On the lower end of the shaft f, a tubular or cylindrical
grinder C, is secured centrally, said grinder being composed of emery compound or
imilar suitable material.
A large lever D, similar in shape to a bell-crank lever is pivoted at o to a side of
he body A and is adapted to swing vertically in the same vertical plane as the
haft f.
One arm of said lever is provided with a handle a. and an are slot n through which

page_text: a set screw r passes into the body A. A screw t, passes into the upper end of the arc
slot and serves as a stop for engaging the set screw r, and regulating the length of the
lever stroke.
'
v,
to which a
The bracket E, is provided
The opposite arm of the lever D, is provided with a vertical face plate
vertically adjustable bracket E is secured by screws w.
with horizontal arms a, bearing vertical journals y.
To the lower end of the bracket E, a vertically adjustable angle-iron z, is fastened
to which a horizontally adjustable bracket F, is secured by bolts 15. In the outer
end of the bracket F, a horizontal stub-shaft is journalled and bears a grooved
pulley 17, on its outer end and a bevelled pinion 18, on its inner end.
A sleeve 19, is fitted to rotate in the journals y, and is provided with a supporting
shoulder 20, near its upper end. A horizontally arranged bevelled gear is secured to
the lower end of the sleeve 19, and meshes with the pinion 18, on its upper side.
A vertically arranged shaft 21, is fitted to rotate in the sleeve 19, the lower end of
said shaft being reduced to form a shoulder at 22, and passing through the bracket F.
Below said bracket a horizontally arranged bevelled gear 23, is secured to the shaft
and meshes with the pinion 18, on its under side said pinion when in motion driving
said sleeve 19, and shaft 21, in diametrically opposite directions.
A coiled spring 24, disposed around the shaft 21, between the bracket F and
gear 23, prevents it from riding upward.
The ball-holder H which is mounted on the upper end of the shaft 21, and
sleeve 19, is constructed as follows:-
A horizontally arranged disc 25, (see Figure 6) rests centrally on a shoulder on the
upper portion of the sleeve 19, and is held in position by a check-nut turned on to the
threaded upper end of said sleeve.
The central portion of the upper face of the disc is depressed at 26, forming a
receptacle to receive the dust or powder from the balls.
Ducts or openings 27, for the discharge of the same, lead from said receptacle
through the bottom of said disc.
A flat ring or annulus 28, which forms a bed-plate for the balls when being ground,
is secured to the upper face of the disc 25, by screws 29.
A series of flat segmental plates 30, having their parallel edges formed on arcs of
the same circle as the disc 25, are secured to the upper face of the annulus 28, with
their outer edges in the same vertical plane. These plates are adjustable laterally
by means of the screws 31, which pass through radial slots 32, in each end thereof
into the bed-plate or ring 28, and are held in position when so adjusted, by set-
screws 33, passing horizontally into said ring 28, and segmental plates.
A disc 34, is mounted on the upper end of the shaft 21, the upper face of said disc
being in the same horizontal plane as the corresponding face of the ring 28. The
disc 34 is slightly less in diameter than the depression 26 in the disc 25, as shown in
figure 6.
A series of triangular or wedge-shaped segmental plates 35 and 36, have two
opposite edges parallel and formed on arcs of circles having the same centre as the
dises 25, and 34. These plates alternate with each other and are adjustably and
conjointly arranged on the upper face of the disc 34, so that their outer edges project
beyond the periphery of said disc over the ring 28, and together form a complete
circle parallel with that formed by the inner edges of the segmental plates 30, as
shown in figure 2. The plates 35 and 36, are adjustable radially on their disc by
means of set screws 37, and radial slots 38, in the same manner as the plates 30
described.
The plates 36, serve as wedges for spreading the alternate plates 35, and are
actuated by screws 40 turned into the disc 34. Said screws are provided with heads
(see figures 8 and 9) disposed eccentrically on their shanks.. The screws 40, are
placed in the central radial line of the wedge-plates 36, and when rotated their heads
act as cams for forcing said plates outward.
The outer edges of the plates 35 and 36, are bevelled inwardly at 41, (see
figures 4, 5 and 6) and the space 42, between the adjacent edges of the outer

page_text: plates 30, and inner plates 35 and 36 forms an annular race in which the balls 45
travel.
Two of the plates 30 have their adjacent ends cut away as shown at 46, in Figure 2
to allow one of said plates to be swung outwardly into the position shown by dotted
lines in said figure and thus afford sufficient space for the insertion of the balls 45,
into the race 43.
When so inserted the balls project slightly above the upper edges of the race.
Power being applied to the grooved pulley 17, the discs 34, and 25 attached respec-
tively to the shaft 21, and sleeve 19, are rotated thereby in opposite directions. An
eccentric rotary movement is thereby imparted to the balls 45, the bevelled edges of
the plates on the disc 34, engaging said balls above their horizontal diameter.
The handle is now depressed to move the lever D, and elevate the holder H, into
a plane parallel with the rotating grinder C, which comes into contact with said balis,
said lever being held in this position by means of the set screw r. The shaft of the
holder H, is so arranged that when elevated as described, it is sufficiently out of
alignment with the grinder shaft to render said grinder slightly eccentric in relation to
the ball-race. This permits the contact of the balls to be distributed over the whole
working face of the grinder and prevents them from wearing a groove therein.
By imparting opposite rotary movements to the walls of the race as described, the
balls are caused to rotate far more rapidly and in more directions than when rotated
solely by the grinder, and a ball revolver in vertical alignment as is customary in
machines of this class, thus producing much more accurate spheres.
The side walls of the race being horizontally adjustable as described, renders the
device operative when the balls vary greatly in size.
The worm g, is provided with an exceedingly fine thread and the ratchet j, thereon
with correspondingly fine teeth enabling the degree of contact of the grinder with the
balls to be very finely adjusted.
The race walls being formed from a series of adjustable plates the wear of any
portion thereof may readily be compensated for.
The diagonal arrangement of the grinder and means for elevating and lowering the
ball holder greatly facilitates the adjustment of the balls in the race an 1 effects a saving
of time in operating the machine.
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.
First In a ball grinding machine, a diagonally arranged rotary grinder in com-
bination with a rotary ball-holder adapte i to be moved into parallism with said grinder
substantially as and for the purpose set forth.
Second in a ball-grinding machine, a body, a cylindrical rotary grinder diagonally
arranged thereon and a rotary holder provided with a ball-race and adapted to be
moved into parallelism with said grinder substantially as described.
Third-In a ball grinding machine, a body, a rotary grinder diagonally arranged
and longitudinally adjustable thereon, a vertically adjustable holder provided with
a ball-race and pivoted to said body substantially as and for the purpose set
forth.
Fourth In a ball grinding machine, a body a diagonally arranged shaft
adjustable longitudinally thereon and bearing a cylindrical grinder a rotary holder
provided with an annular race and adapted to be moved into parallism with the
grinder so that the working face of the grinder will be eccentric in relation to said
race substantially as set forth.
Fifth In a ball-grinding machine a body a diagonally arranged shaft journalled in
a carriage fitted to slide thereon and bearing a cylindrical grinder a worm for
adjusting said carriage longitudinally and a rotary holder provided with an annular
ball race and journalled on a lever pivoted to said body substantially as and for the.
purpose set forth.

page_text: Sixth In a ball grinding machine a body, a rotary holder provided with an annular
ball race said holder comprising an inner and outer disc mounted respectively on a
shaft and enclosing sleeve; mechanism for conjointly rotating the shaft and sleeve in
opposite directions, a diagonally rotating grinder and a lever supporting the holder
mechanism and pivoted on said body substantially as described.
Seventh A rotary ball-holder for ball grinding machines, provided with an annular
race said holder comprising an inner and outer disc mounted respectively on a rotary
shaft and encircling rotary sleeve, and race-plates laterally adjustable on said discs
the edges of said plates forming the side walls of said race substantially as
described.
Eighth A rotary holder for ball grinding machines comprising an inner and
outer disc mounted respectively on a rotary shaft and encircling sleeve, and laterally
adjustable plates on said discs the adjacent edges of which form the side walls of an
annular ball-race one of said plates on the outer disc being pivoted to swing outward
substantially as described.
Ninth The rotary holder H comprising the disc 34 mounted on the shaft 21, the
disc 25 mounted on the rotary sleeve 19 enclosing said shaft and the radially adjustable
segmental plates 35, 36, and 30 mounted respectively on said dises and forming the
annular race 42, substantially as and for the purpose set forth.
Tenth In a ball grinding machine a body, a diagonally arranged rotary shaft
mounted in a sliding carriage thereon, a cylindrical grinder on said shaft, a worm for
adjusting the carriage longitudinally a bell-crank lever pivoted to said body, a rotary
holder provided with an annular race and comprising an inner and outer disc mounted
respectively on a shaft and enclosing sleeve journalled on an arm of said lever and a
stub-shaft on said arm bearing a bevelled pinion meshing with gears on said holder
shaft and sleeve whereby they may be rotated in opposite directious substantially as
and for the purpose set forth.
Eleventh In a ball grinding machine a body, a diagonally arranged rotary grinder
adjustable longitudinally thereon a rotary holder provided with an annular ball-race
the side walls of said race being fitted to rotate in opposite directions and a lever on
said body for elevating the holder substantially as described.
Twelfth In a ball grinding machine the combination of a body a diagonal rotary
shaft journalled on a carriage fitted to slide on said body, a cylindrical grinder on said
shaft, a worm for adjusting said carriage, a lever pivoted on said body and means for
securing it in position, a holder provided with an annular ball-race, and comprising an
inner and outer disc respectively fixed on a shaft and rotary encircling sleeve mounted
in journals vertically adjustable on an arm of said lever and a stub-shaft on the lever
bearing a pinion meshing with gears on said holder shaft and sleeve whereby they may
be rotated in opposite directions substantially as and for the purpose set forth.
Thirteenth The carriage B fitted to slide diagonally on the body A, the rotury
shaft mounted on said carriage and bearing the cylindrical grinder C and the worm g
for adjusting said carriage in combination with a rotary ball-holder provided with
a race and mounted on a lever pivoted to said body whereby said holder may
be elevated into working contact with said grinder substantially as and for the
purpose set forth.
Fourteenth In a ball-grinding machine provided with a rotary cylindrical grinder,
a holder provided with an annular ball-race, having laterally adjustable side walls,
mechanism for rotating said walls in opposite directions and means substantially as
described for moving said holder into parallelism with the grinder and with its race
eccentric in relation to the working face of said grinder.
Fifteenth The holder H comprising the disc 25 provided with the radially
adjustable race-plates 30, the disc 34, provided with radially adjustable race-
plates 35 and 36 in combination with mechanism substantially as described for
rotating said plates in opposite directions.
Sixteenth-The holder H comprising the disc 25 having the depression 26 and
ducts 27 and provided with the annulus 28 and adjustable race-plates 30 the disc 34

page_text: provided with adjustable wedge-shaped race-plates 35 and 36 and the cam screws 40,
said discs being mounted to rotate in opposite directions substantially as and for the
purpose set forth.
Seventeenth-In a ball holder for grinding machines a ball-race having its side
walls formed from two series of segmental plates respectively adjustable radially on
oppositely rotating discs substantially as described.
Eighteenth-In a ball grinding machine the holder H provided with the radially
adjustable race-plates 35 and 36 in combination with the screws 40 having
eccentric or cam heads in engagement with said plates 36 substantially as set
forth.
Nineteenth-The lever D pivoted on the body A and provided with the arc
slot p and stop t in combination with the set screw r and a rotary holder mounted
in vertically adjustable journals on an arm of said lever substantially as described.
Twentieth-In a ball grinding machine, a body, a rotary hall holder mounted on a
bell-crank lever pivoted to said body and vertically adjustable thereon said holder being
provided with two series of race-plates rotatable in opposite directions, a stop for said
lever a rotary cylindrical grinder mounted on a diagonally arranged shaft on said body,
a sliding carriage for said shaft and a worm for adjusting said shaft longitudinally
substantially as and for the purpose set forth.
Dated this 1st day of July 1890.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, Agents for the Applicant.