Improvements in or in connection with Writing Slate Frames.
Year: 1898

page_text: Date of Application, 5th July, 1898-Accepted, 13th Aug., 1898
COMPLETE SPECIFICATION.
Improvements in or in connection with Writing Slate Frames.
A communication by GUSTAV M. BEYER, of No. 1019, Teutonia Avenue, Mil-
waukee, 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, Manchester, both
in the County of Lancaster, 118, New Street, Birmingham, in the County of War-
wick, and 322, 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 improvements in elastic cushions for slates. .The
object of the invention is to so cushion the corners of slate frames as to prevent
noise by contact, incidental to handling.
The construction of the invention is further explained by reference to the accom-
panying drawings, in which-
Figure 1 represents a front view of the improved slate, showing two forms of
cushions secured thereto.
Figure 2 is a perspective view of a portion of the slate, showing a vertical
section through one of the cushioned corners.
Like parts are referred to by the same reference letters in both views.
A represents the slate; B is the frame; C and D are the elastic cushions. Both
forms of cushions C and D shown in Figure 1 consist of elastic bands formed in
single pieces, the length or circumference of which, before being expanded, are
preferably less than the distance around the recessed corners to which they are
secured, whereby, when being put in place, it becomes necessary to expand them
slightly until brought into their respective recesses, when they contract and are
retained in place by their own elasticity.
By the preferred form of cushion C, shown at the right in Figure 1, the elastic
bands are cylindrical in shape and the recesses E are also cylindrical in forin,
conforming in shape and size to the cushion C, while the entrance openings to
said recesses are of less diameter than said rubber cushions, whereby it becomes
necessary to compress them slightly when forcing them into the recesses, when
they expand of their own elasticity and are firmly secured therein.
Thus, it is obvious that the cushions C are retained in place by their contraction
in length around the corner and by their expansion in cross section within their
retaining recesses. The periphery of the cylindrical cushions are permitted to
project slightly beyond the corners of the frame, as shown, sufficient to prevent
contact.
By the modified form of cushion D, shown at the left in Figure 1, flat elastic
bands are used which are secured to the frame in recesses F which may be formed
by a single saw-cut, the wall of which impinges upon the respective sides of the
elastic bands and holds them in place.

page_text: G is a cylindrical cushion which is secured in an aperture H formed through
the frame by contact with the elastic bands F which impinge upon its two pro-
jecting ends. The object of the cylindrical cushion G is to give greater elasticity
to the cushions than would be otherwise produced by the cushion alone, while the
bands F perform the two-fold function of a cushion and a retaining band.
The elastic cushions referred to are preferably formed of rubber, but other
equivalent substances may, if desired, be substituted therefor.
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 correspondent, I declare that what I claim is;-
1. The combination with the corners of a slate frame, provided with retaining
recesses; of an elastic cushion secured thereto and held in place by its own elas-
ticity, substantially as and for the purpose specified.
2. The combination with the corners of a slate frame, provided with cylindrical
retaining recesses formed within its marginal edge, having entrance openings of
less diameter than such recesses; and a cylindrical elastic cushion of greater
diameter in cross section than its retaining recess, and of less length than the
bearing surface around which it impinges, whereby said cushions are retained
around said corners by their contracting force longitudinally, and within said
recesses by their expansive force in cross-section, substantially as and for the
purpose specified.