Year: 1889

page_text: acciare te nature ΟΙ
Invention, anu
performed, to be particularly described and ascertained in and by the following
statement:
Our Improvement relates to that class of sash balances in which a spring-case is
secured to the window-casing, and a tape extending therefrom, is attached to the sash,
the winding of the tape on the spring roller drawing up the sash and holding it
suspended at any desired height.
The invention consists in the construction of the case hereinafter described, whereby
one side acts as the brake on the roller, as will be more fully set forth.
In the drawings,
Fig. 1 is a diagram showing a sectional side elevation of the attachment applied to
a window.
Fig. 2 is an enlarged central, longitudinal section of the device.
Fig. 3 is a view similar to Fig. 2, but showing the case with the spring roller and
its attachments removed from place.
Fig. 4 is a horizontal cross-section of the case in line x, x, of Fig. 1.
Figs. 5 and 6 are perspective views of the halves of the case separated.
Fig. 7 is a diagram showing an edge view of the half of the case that forms the
brake.
A and B indicate the two plates forming the case. These plates, when attached one
to the other, are adapted to fit into a mortise in the casing of the window, and are
secured by screws a, a, which pass through the face-plate b. The plate A, which
forms the main body of the case, consists of the face-plate b, the side plate c, and two
flanges d, d, one at the top and the other at the bottom, which form a boxing to cover
a portion of the roller. The plate B, which forms the clamp or brake, consists simply
of the side plate f; two angular flanges g, g, at the top and bottom, and a projecting
pintle h, on which the spring-roller turns loosely. The flanges g, g, do not stand at a
right angle, but incline somewhat inward, as shown in the edge view, Fig. 7, so that
when said flanges are fitted into the plate A and drawn tightly against the back by the
screw hereinafter described, the front edge of the plate will be drawn in toward the
other side plate c, and out of parallelism therewith, as shown in Fig. 4. One or both
of the flanges g, g, has a slot k Fig. 6, which fits over a screw i, and behind a nut j
thereon in the face-plate b. The screw simply passes through the face-plate, and the
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page_text: nut is prevented from turning by striking an offset 1, of the flange. When the parts
are fitted together, with the flange embracing the screw, and the screw is turned up,
then the face-plate will be drawn in at the outer edge as above described.
D is the spring-roller, on the outside of which winds the metallic tape E, that is
attached at its lower end to the edge of the shaft G. This roller is fitted between the
side plates f, c, and turns loosely on the pintle h.
His a flat coiled spring inside the roller, attached at one end to the stationary
pintle h, and at the other to the roller. When the sash is drawn down, the spring
will be wound up, and, vice versa. When the sash is raised, the spring will be
unwound. Its action is such as to hold the sash suspended at any given height.
The great advantage of this invention consists in the construction of the case,
whereby one of the side-plates, B, forms the clamp or brake to prevent the roller
running too freely. By turning the screw i the outer edge of plate fis drawn forcibly
against the side of the roller D, thereby clamping it against the fixed side plate c and
holding it with any desired tension. The adjustment is made before the fixture is
applied to the window-casing, and will rarely require any change. It, however, can
be tightened or loosened at any time, as the head of the screw stands outside. By
this construction the case itself acts as the brake, thereby avoiding the attachment of
a special brake, which is generally used in this class of sash balances. The cost is
thereby greatly lessened and the device is simpler in action. Two of these fixtures
are used to each sash, one on each side.
In some instances the pintle h is provided at its inner end with an enlarged bevel ¹,
and the hole in the plate of the roller which fits it is also formed with an incline as
shown in Fig. 4. As the sash is drawn, the tension of the spring increases, and the
pressure on the roller is such as to cause the inclined side of the hole to draw down or
slide forward on the bevel 1, thus forcing the face of the roller to bear with greater
friction against the plate A and increase the brake power. In heavy sashes this is of
special advantage. The plate A at the rear has a small projecting flange v, Fig. 4,
which holds the rear edge of plate B in position and prevents it from slipping out of
place. If desired two of the screws may be used--one at each corner-to draw
plate B to place to produce the brake action.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is,
1st. In a sash-balance, the combination,.with the spring-roller, of the case consisting
of two parts with side plates, one of which is stationary, the other movable, and a
fastening device connecting the fixed plate with the movable plate, whereby, when it
is operated, said movable plate will clamp the roller, as shown and described, and for
the purpose specified.
2nd. In a sash-balance, the combination, with the spring-roller, of the case
consisting of two parts with side plates, one of which is stationary, the other movable,
and a screw connecting the fixed plate with the movable plate, whereby when it is
turned, said movable part will clamp the roller, as shown and described, and for the
purpose specified.
3rd. In a sash-balance, the combination of the case consisting of the side plates A, B,
one fixed and the other movable to form a clamp, the plate B being formed with a
pintle h having a beveled inner end 2, and the roller D, fitting on said pintle within
the case, as shown and described, and for the purpose specified.
Dated this 25th day of January 1889
ALLISON BROS.,
Agents for the Applicants.