Improvements in Sand Papering Machines.
Year: 1896

page_text: Date of Application, 28th July, 1896-Accepted, 10th Oct., 1896
COMPLETE SPECIFICATION.
Improvements in Sand Papering Machines.
I, WALTER BLACK, Engineer, of 204 Dearborn Street, Chicago, Cook County,
Illinois, United States of America, 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 :-
The object of my invention is to provide a simple, economical machine for
sand-papering wood strips, mouldings and similar articles; and the invention
consists in the features and combinations hereinafter described and claimed.
In the accompanying drawings,
Figure 1 is a side elevation of my improvement with one side flange removed
and some of the parts in section;
Fig. 2 an enlarged sectional view of the rolls of sand-paper, taken on line 2 of
Fig. 1;
Fig. 3 an enlarged view of a portion of the mechanism, taken on line 3 of
Fig. 1; and
Fig. 4 a detail view of a portion of the mechanism, taken on line 4 of Fig. 1..
In the art to which this invention relates, it has long been desired to sand-paper
irregular shaped mouldings and in a continuous manner. Various mechanisms
have been designed to accomplish this result, but it has been found almost
impossible to do it as economically as by hand, and preserve the shape and well
defined contour. The principal object of my invention, therefore, is to overcome
all existing defects and produce a simple and efficient machine that will sand-paper
mouldings and similar articles economically and efficiently.
In constructing my improvement, I make what I term a drum, A, which consists
of two flanges, a, mounted upon a rotatable shaft, A', by means of the hubs a¹.
Secured to the drum, and between the flanges at equi-distant points of a circle, are
rolls, B, which contain strips of sand-paper, C, preferably slitted-see Fig. 2-
so as to more readily conform when in use to different shapes. These rolls, or spools
are secured to the drum by means of the shouldered bolts, b, circular flanges, 61,
and nuts, 66, so that, should it become necessary to replace a roll by a new one,
all that is necessary to do is to remove one of the nuts, 6,-take off the flange, b¹,
when the spool or roll may be easily removed or a new one inserted.
In order to keep the sand-paper in contact with a piece of moulding, D, to be
sand-papered, I provide a plurality of flexible portions, E, one for each of the
rolls of sand-paper. In the drawings I have illustrated these flexible portions as con-
sisting of a number of broom-corn brushes arranged tangentially, with relation to the
rolls; and, in order to secure these in position, I mount the handle portion, e, in
blocks E. There supporting blocks are provided with trunnions, e', by which they
are pivotally mounted in the flange portions of the drum. To furnish a backing
for the brush or yielding portions, I provide curved metal strips, G, which have
one end secured to the supporting blocks, E', as shown in Fig. 4 by means of the
clamps, and are also provided with inwardly extending side lugs, g, for the
purpose of strengthening the back as well as guiding and holding it in the correct
plane. I provide a second set of clamps. G₁, and screws, 9, by which the
brushes are secured to the back portions, the screws being passed directly through
the body of the brushes. Adjacent to each of the supporting backs, I provide
rods or belts, H, which are passed through the flanges of the drum or wheel, and
which act as a support or limit to the movements of the back portions.

page_text: In applying said paper for use, I bring the free ends, C₁, out along the upper
surface of the brush until it is even with the free ends of the brushes; and in
order to secure it there I provide a number of clamps-see Figure 3-I, which are
passed across the upper surface of the sand-paper and pressed against it, so as to
hold it firmly in contact with the brushes, by means of the securing bolts and
nuts, i, which enter the flanged portions of the drum. When the outer free end
of the sand-paper is worn, all that is necessary to do, in order to have a fresh
portion, is to loosen the nuts of the securing bolts, i, draw out a fresh portion of
the sand-paper, retighten the securing bolts, and clip off the worn end of the
paper. The upper brush of Fig. 1 is shown in working contact with a piece of
moulding and a brush pressed against the entire length of its supporting back.
When it is desired to use my sand-papering apparatus, it may be mounted upon
suitable standards or supports, which I deem unnecessary to illustrate as they
are so well known to mechanics. In fact, I have only shown that portion of my
invention which I deem best and most necessary to illustrate the improvement
having left off all minor details, as the drum is applicable to many styles of
machines.
In operation, the drum is rotated in the direction indicated by the arrow, and
the strip of moulding fed steadily-either by hand or a machine-iuto contact
with the sand-paper, pressing the same down to nearly the periphery of the drum.
The flexible back portion keeps the sand-paper in contact with all portions of the
surface be it irregular of the O. G. shape, or be it smooth-and efficiently
finishes the saine, giving it a higher degree of finish than it is possible to give it
by hand. By making the rolls of sand-paper in narrow strips, and securing them
together at points about six inches apart, the sand paper is enabled to more
readily give and conform to the shape of the moulding; that is, it enables the
short strips to drop into the sharp corners or adapt themselves to the small
curves.
While I have described my invention with more or less minuteness as regards
details, and as being embodied in precise forms, I do not desire to be limited
thereto unduly, any more than is pointed out in the claims. On the contrary,
contemplate all proper changes in form, construction and arrangement, the
omission of parts and substitution of equivalents, as circumstances may suggest or
render expedient.
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 acsand-papering machine, the combination of two or more rolls of sand-
paper arranged on a circle aud adapted to have their free ends brought into
operative position, means for holding and rotating them in that position, and a
flexible back for holding the free ends of the sand-paper in operative position,
substantially as described.
2. In a sand-papering machine, the combination of a rotatable supporting drum,
a plurality of rolls of sand paper arranged on a circle and adapted to have their
free ends brought out into operative position, a flexible back for each roll to hold
the free ends of the sand-paper in operative position, and a rigid back to limit the
movement of the flexible back, substantially as described.
3. In a sand-papering machine, the combination of a rotatable supporting drum
comprising two flange side portions mounted upon.a rotatable shaft, a plurality of
rolls of sand-paper mounted in a circle and between the flanged sides of the drum
and adapted to have their free ends brought out into operative position, a flexible
back portion for each roll to hold the free ends of the sand paper in operative
position.. a rigid back to limit the movement of the flexible portion, and means for
keeping the sand-paper in operative engagement with the flexible back, substantially
as described.
4. In a sand-papering machine, the combination of a rotatable supporting drum

page_text: comprising two flange side portions mounted upon a rotatable shaft, a plurality of
rolls of slitted sand paper removably mounted in a circle between the flanged side
portions and adapted to have their free ends brought out into operative position,
a brush for each roll forming a flexible back to hold the free ends of the sand-
paper in operative position, a rigid back to limit the movements of the flexible
back, means for securing such back portions together, and means for keeping the
Band paper in operative engagement with the flexible back, substantially as
described.
5. In a sand-papering machine, the combination of a flexible back portion adapted
to support and hold sand paper in operative position, and means for holding and.
rotating such flexible portion, substantially as described.
6. In a sand-papering machine, the combination of a flexible back portion having
a free protruding end or ends adapted to hold a piece of sand-paper in operative
position, means for clamping and holding at least one end of a piece of sand-paper
in contact with the flexible backing, and means for rotating the parts, substantially
as described.
1 CT. 1 1000
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant..