Year: 1888

page_text: Date of Application (in United Kingdom), 2nd Oct., 1888
Complete Specification Left, 2nd Oct., 1888
Complete Specification Accepted, 9th Mar., 1889
I, WILLIAM HENRY DAWSON, of the City of Lawrence, County of Essex, and State
of Massachusetts, United States of America, Gentleman, 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 has for its object to prevent the admission of dust, cinders, and the
like, around the sashes of car-windows, and it consists in a sash having a flexible strip,
preferably of rubber, inserted in its edges, combined with a casing having grooves,
formed to receive the said strip, the form and depth of each groove being such as that
the outer edge of the sash strip therein will closely fit the bottom of the groove, the
depth of which is slightly less than the width of the strip, so that the latter has to be
bent slightly and is thus caused to bear firmly against the bottom of the groove, while
the width of the groove is such as to permit the described bending of the strip, as I
will now proceed to describe.
In the accompanying drawing,
Figure 1 represents a perspective view of the sash and a portion of the casing of a
car-window embodying my improvement.
Figure 2 represents a vertical section of the same.
Figure 3 represents a horizontal section.
Figure 4 represents an enlarged sectional view of a portion of the sash and
casing.
Figure 5 represents a similar view of a modification.
Figure 6 represents a section of a portion of the window ledge or sill and the lower
portion of the sash.

page_text: -
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The same letters of reference indicate the same parts in all the figures.
a represents the casing of a car-window, and the sash thereof.
In carrying out my invention I insert in the edges of the sash, flexible strips c, c,
which are preferably of sheet rubber, said strips projecting outwardly from each
vertical edge of the sash. A similar strip c¹ is preferably inserted in the bottom of
the sash as shown in figures 2 and 6.
The casing is provided with grooves fƒ formed to receive said strips. The depth
of each groove is slightly less than the width of the strip which enters it, and the
bottom of each groove is made narrow to form a seat 2 against which the outer edge
of the strip c bears; the said edge being held against the bottom of the groove with a
yielding pressure which is caused by the transverse bending of the strip, which
bending is made necessary by the excess in the width of the projecting part of the
strip over the depth of the groove f.
Each grove fis tapered or made wider from its bottom outwardly (as shown in
figures 3, 4 and 5) to permit the described bending of the strip. It will be seen
therefore that when the sash is inserted in the casing, the strips c c at their vertical
edges will enter the grooves ff and will be at once hent cross-wise as shown, the
deflected portion of each strip being accommodated by the wider portions of the
grooves, while the edges of the strips are closely pressed by the elasticity of
the material of the strips against the seats 2, 2 at the bottom of the grooves. The
joints between the edges of the sash and the casing are thus tightly closed and the
window is prevented from rattling. The friction of the strips on the grooves is
sufficient in some cases to support the sash in a raised position. The edges of the
strips are guided by the seat 2 and the sides of the grooves, so that said edges cannot
be displaced laterally.
The groove f¹ in the window ledge or sill is preferably formed like the grooves
in the sides of the casing, and the strip c¹ which enters said groove when the window
is closed is preferably wider than the depth of said groove, so that when the sash is
closed said strip is slightly bent.
The strips may be of rubber, as already stated or, if preferred, they may be made
of metal sufficiently thin to have the required flexibility, in which case the bottom
of the groove may be protected against wear by a linings of metal, as shown in
figure 5.
I am aware that it is not new to apply a flexible strip to a window sash, said strip
being disposed in a groove in the parting head between the upper and lower sash;
but, so far as I am aware, a groove of the form herein shown and claimed has not
been provided in the casing to receive and guide a strip projecting from the edge of
.a sash.
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 5-
A window sash having flexible strips c projecting from its edges, combined with a
casing having grooves of less depth than the width of the projecting portions of the
strips and provided with narrow bottoms or seats 2, of the same width as the outer edges
of the strips, and with inclined sides which converge from the outer ends or mouths
of the grooves to the seats 2, said sides guiding the outer edges of the strips c
to the seats 2 and keeping said edges in close contact with said seats, as set forth.
Dated this 2nd day of October 1888.
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London,
Agents for the Applicant.