Year: 1886

page_text: Duttons.
I, JACOB MARLA of the firm of Gebrüder Mahla, of Gablonz, Bohemia in the
Empire of Austria, Manufacturers, do hereby declare the nature of my invention
and in what manner the same is to be performed, to be particularly described'
and ascertained in and by the following statement :-
t
My invention relates to apparatus for grinding the edges of circular buttons to
cylindrical or conical form.
According to the said invention the button, the edge of which is to be ground, is
fixed to the end of a rotary spindle, with its axis coinciding with the axis of the
said spindle and at right angles to the axis of the grinding surface. The frame
within which the bearings of the said spindle are located and which is made
movable upon a horizontal axis, is constantly forced by means of a spring toward
a grindstone, turning upon a horizontal axis, so that the circumference of the
button is in contact with the surface of the grindstone. In order to prevent the
edge of the button from being ground off beyond the desired degree, an adjustable .
stop is provided for the spindle frame, said stop limiting the approach of said
frame to the grindstone.
In the accompanying drawing
Figure 1 is a sectional side elevation of a button edge grinding machine
embodying this invention and
Figure 2 is a top view of the same.
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The spindle frame A is movable upon a horizontal shaft b, fixed by means of the
cheeks b¹ to the box B, designed to receive the grindings. Lateral displacement
of the frame A on the shaft b is prevented by means of adjustable collars provided
with set screws.
The cheeks 6 Figure 1 are not provided with plain holes for the fastening bolts,
but with slots which admit of the cheeks being adjusted toward the grindstone C
or in the opposite direction; the grindstone is mounted on a shaft c parallel to the
shaft b. By suitably adjusting the shaft b, the spindleta, carrying the button D
+
077

page_text: to be ground can be inclined as required according to the conicity of the edge to
be obtained.
The spindle a is supported at its lower end by a step-bearing a¹ and near its
upper end by a bearing a². The said spindle carries a worm-wheel a³, gearing
with a screw E. In order to admit of this screw being adjusted so as to be always
in gear with the worm-wheel a³ whatever may be the inclination of the shaft a,
the bearings of the shaft e which carries the screw E, are formed in a slide e¹,
movable along a guide groove. Above the sleeve a² of the spindle a is secured
a cup
a in order to prevent the dust from the grindstone from falling into the
bearing.
Above the cap a is placed a sleeve a³ designed to support the button D to be
ground. This sleeve is screwed to the shaft a and is held in position thereon by
a lock-nut, interposed between the cap a' and the sleeve a³.
Several sleeves a³ of different diameters are provided for every grinding machine,
in order to afford means for adapting the machine for working different sized
buttons.
The button D is held in position upon the sleeve a³ by a lever a³, constantly
forced downward by a spring a'. The cylindrical end by which the said lever a
holds down the button D, is formed into a socket, within which a swivel pin a³ is
located; said pin having its lower head lined with leather, and turning with the
button D and shaft, a.
The plate spring F articulated to the bottom of the box B and rigidly secured to
the spindle-frame A forces the button D against the grindstone C. The pressure
exerted by the said spring F may be regulated at will by means of a screw f
passing through a screw socket formed in a plate f¹, secured to the front side of
the box B. The plate f¹ further supports another screw g to the front end
of which is attached by means of a pivot joint, a plate G provided with a slot.
Through this slot, and through a slot of the spindle-frame A, extends a bolt c.
The front wall of the alot in the plate G forms the stop by which the displacement
of the spindle frame A toward the grindstone C, caused by the pressure of the
spring F is limited. The position of the screw g'is adjusted, according to the
extent to which the edge of the button is to be ground off, by means of the nut g¹,
adapted to be rotated by the hand wheel g' and to be fixed by the set screw g³.
When a button after grinding is to be removed from the apparatus and replaced
by a fresh one, the spindle frame A is pulled backward, when the jointed plate G
will fall down under the action of gravity as soon as the bolt a arrives beneath the
widened rear portion of the slot formed within the plate G. The said bolt x then
enters the said widened portion or recess, whereby the spindle frame is locked in
its withdrawn [position. The lever a is next turned upon its pivot and while
holding the said lever by one hand, the ground button is removed and a fresh one
substituted by means of the other hand. The operator while retaining with one
hand the spindle-frame A, now lifts the link G with the other hand, in order to
disengage the bolt a from the widened portion of the slot, and finally allows the
frame to gently move toward the grindstone C.
As shown in Figure 2, several grinding spindles may be arranged in connection
with a single grindstone. Moreover, any number of grindstones C may be mounted
on a common shaft o driven by means of a belt-pulley c¹. In this case also the
screws E of all the grinding apparatuses are fixed to a common shaft & carrying
a belt pulley e³.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is :-
First. An apparatus for grinding the edges of circular buttons into cylindrical
or conical form, the said apparatus consisting of a rotary spindle, supported by
a frame which is movable round a horizontal axis which is adjustable, said spindle

page_text: having the button concentrically locked to its upper end, and the spindle-frame
being constantly pressed toward the grindstone, the shaft of which is parallel to
the axia, round which the spindle frame is movable.
Second. In an apparatus of the kind referred to in the first claiming clause an
adjustable stop, which limits the movement of the spindle-frame toward the
grindstone, and hence the extent to which the button is ground off.
DAL: AL
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.