Improvements-in-Grinding-and-Polishing-Machines.
Year: 1897

page_text: Date of Application, 31st Aug., 1897-Accepted, 2nd Oct., 1897
COMPLETE SPECIFICATION.
T
Improvements-in-Grinding-and-Polishing-Machines.-
J
I, FRANK RUDOLPHI, of No. 1573 Carroll Avenue, in the City of Chicago, County
of Cook and State of Illinois, United States of America, Manufacturer, do hereby
declare the nature of this. invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following.
statement:-
―
This invention relates to improvements in grinding and polishing machines,
and has been devised more especially for operating upon metal. As heretofore
constructed, machines of this class have usually been provided with a table for
supporting the work mounted upon an arbor arranged parallel with the axis of the
grinding disk and adapted to be rocked at will upon said arbor to either side while
the machine is operating to carry the work across the disk.
As the articles
operated upon are usually held in position upon the table by hand, it will be seen
that when the tables are tipped, the exertion imposed upon the operator is greatly
increased, especially when the work is heavy, and in any event the operator must
use extra care and maintain a constant hold upon the work to prevent it from
sliding off the table.
I have discovered that it is a great advantage in this class of machines, at least
for some classes of work, to make the table permanently horizontal and give it a
movement at right angles to the axis of the grinding disk so that the work may be
moved across the grinder. And to this end I mount the table upon two parallel
arms pivoted to the table and one under each end thereof, and swinging upon
supporting pivots arranged parallel with the grinder axis. With this con-
struction the table is movable across the grinder from front to rear, and at all times
retains its horizontality. The details of the invention are fully set forth below and
also illustrated in the accompanying drawing, in which
Fig. 1 is a front elevation of my improved machine, partly in section, and Fig. 2
is an end elevation thereof.
:
In said drawing A represents the grinding disk, driven by. the pulley B upon
the shaft A' of the disk, and C is the table for supporting the work. The table is
arranged across the face of the disk in the usual manner, and it is mounted upon
two parallel arms supported upon the parallel pivots I inserted in socket D¹ upon
the end of the machine and projecting in a direction parallel to the shaft A¹
Each of these arms is composed of a short stud E, pivoted to the under side of the
table at E, and a sleeve 12 attached to a hub E3 mounted upon one of the pivots D.
The sleeves are adapted to receive one of the studs E and are also split and pro-
vided with bolts E for tightening them upon the studs, so that the length of both
the arms E E may be readily adjusted whenever desired. The sleeve hubs are
held upon the pivots by collars H and H and set screws H¹.
For shifting the table toward the front or the rear, a hand lever F is provided,
and is attached to the front hub E3 by inserting it in the socket F1 cast upon said
hub. I also prefer to employ a counterweight G, adjustably supported upon a
depending lever G¹ having its upper end rigidly held in a socket G2 cast upon the

page_text: rear hub Es, such counterweight acting to retain the table in its central position
except when overcome by the operator, and also to resist in some measure the
tendency exerted by the grinder to force the table in the direction of the grinder's
revolution. The sun orting arms are located under the end portions of the table
and at opposite sides of the plane of the grinder axis.
In a machine embodying the features set forth, the table is readily moved either
way desired across the grinder's axis by the hand lever, and maintains its horizon-
tality both while in motion and at rest.
In speaking of the table as being horizontal or as retaining its horizontality, I
do not mean to be understood as meaning that the table must be exactly horizontal.
As a matter of fact in actual use of the invention no special care is ordinarily
taken in adjusting the arms to the same length. The table may have some
inclination without affecting its ability to hold the work, and this inclination may
be given purposely if desired.
In order to enable the operator to lock the table stationary when that is desirable,
the collar H is provided with a bolt H2 adapted to enter a recess in the depending
lug E5 upon one of the sleeves E³. A spring H acts upon the bolt to keep it in
its acting position, but it may be held out of action by drawing it back and turning
it slightly so that its laterally projecting pin h may set against the front of the
collar H. The slot h¹ is formed to admit this pin.
The collar H5 is provided with a pin Ho projecting inward into the recess E7
in the depending lug E6 upon the other sleeve E³. By this feature the extent of
the horizontal movement of the table is limited.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, what I claim is:
1st. The grinding and polishing machine, the work table whereof is mounted
upon parallel swinging arms located one under each of its end portions, substan-
tially as specified.
2nd. The grinding and polishing machine having a work table mounted upon
parallel swinging arms, such arms being pivoted at their upper ends to the table
and at their lower ends to the frame of the machine, substantially as specified.
3rd. The grinding and polishing machine, the work table whereof is mounted
upon parallel swinging arms located one under each of its end portions, and is
provided with means for locking against movement, substantially as specified.
4th. The grinding and polishing machine, the work table whereof is mounted
upon parallel swinging arms located one under each of its end portions, and is
provided with means for limiting its movement, substantially as specified.
Dated this 10th dor of Ana 100%
FRANK RUDOLPHI.
Haseltine, Lake & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.