Year: 1886

page_text: Figure, 1, is a side view of the apparatus, a portion of the casing being broken

page_text: There is also a hole in the bar, t, through which the end of the bolt, 8, passes.
This bolt, 8, is provided with an adjusting nut, n, and a coiled spring, s¹. The
.loop, p, is attached to the compound `plate, d, d', to guide the bar, t, and keep it
in a proper relative position to the compound plate, d, d¹.
In arranging the two kinds of metal having different expansive property as
shown and above described, the effect of a lower temperature is to contract those
parts of the compound strips marked, d¹, e¹, f1, and, gl, to a greater degree than
those marked, d, e, f, and, g, which will cause the free ends of the strips, d, d',
and, g, g, to assume positions a greater distance from each other, by reason of
which, the strips, g, gl, being attached to a lug, l, on the base plate, C, to which
base-plate, the lug, m, which governs the longitudinal position of the bolt, 8, is also
attached, thereby causes the bar, t, to be pushed off of the bolt, 8, and allows the
weight to close the valve. The object of this invention being to prevent pipes
from freezing by cutting off the water, it is desirable to prevent its being per-
manently turned on until the temperature shall have risen to a point above that at
which it was set to turn it off, therefore it is an advantage that the sliding bolt
will not enter the hole in the bar, t, until the higher temperature shall have
straightened the compound strips by the unequal expansion of their two sides.
When this expansion shall take place, straightening the compound strips, the
spring, 8, will be compressed, thus making the bolt act as a catch bolt to enter the
hole in the bar whenever the valve shall be opened by means of the bar.
The valve may be closed at any time by withdrawing the sliding bolt, s, by
hand. By means of the nut, n, the sliding bolt can be adjusted to release the bar
at any desired temperature. The casing, c, has a hinged cover which is provided
with a lug, o, the hole in which coincides with the hole in the lugs, o¹, by means of
which the cover may be locked with an ordinary pad-lock or otherwise fastened.
This will prevent the valve from being opened or closed except when it shall be
done automatically by a change of the temperature or by a person having means
of opening the box, as it is the intention to always box up or otherwise make the
weight and lever inaccessible when it is not, as usual, underground.
Having now particularly described and ascertained the nature of the said
invention, and in what manner the same is to be performed, we declare that what
we claim is:-
·
1. In an automatic cut-off for water pipes, the combination of a self closing
valve with the compound plates, e, el, and, f, f¹, hinged together, the supplemental
compound plates, d, d¹, and, g, g³, the bar, t, and sliding bolt, 8, substantially, as
shown and described for the purpose specified.
2. In a cut off for water pipes, the combination of the valve,, B, provided with
an actuating lever, with the bar, t, links, t¹, and bolt, 8, "provided with an adjusting
nut, n, and pressure spring, 81, and the compound plates supported and enclosed by
the box shaped casing, c, the support, C, and legs, C¹, substantially as shown..
Dated the 10th day of October 1886
the 10th day of October 1886
WALKER GAMEWELL BROWNE.
JOHN KEELY.
WILLIAM ARNOLD HEMPHILL.
THOMAS PENDLETON WESTMORELAND.
By Jensen & Son,
Patent Agents,
77, Chancery Lane, London, W.C.