Blow-Off Cock Page: 2 of 3
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UNITED STATES PATENT OFFICE.
JOHN L. ROACH AND LANCE L. DAWSON, OF CHILDRESS, TEXAS.
BLOW-OFF COCKSpecification of Letters Patent.
Patented Nov. 23,1915.
Application filed June 3, 1914. Serial No.842,799.
o all 'whom it may concern:
Be it known that we, JoniN L. RonH 'and
LAcWE L. DAwsoN, citizens of the United
States, residing at Childress, in the county
5 of Childress and State of Texas, have in-
vented new and useful Improvements in
Blow-Off Cocks, of which the following is
a specification.
Our present invention pertains to blow-
13 off cocks for use on locomotive and other
boilers; and it contemplates- the provision
of a blow-off cock of such construction that
access can be readily had to the main con-
trolling valve for cleaning or grinding
15 thereof, without the liability of hot water
or steam escaping from the boiler, and with-
out the necessity of "killing" the fire and
emptying the boiler of water as a condition
precedent to removing the main valve for
20 the purposes stated, or for any other pur-
pose.
The invention in all of its details will be
fully .understood from the following de-
scription and claim when the same are read
25 in connection with the drawings,' accom-
panying and forming part of this specifica-
tion, in which:
Figure 1 is a longitudinal section of the
blow-off cock constituting the best practical
so embodiment of our invention that we have
as yet devised, and showing the main valve
'of the cock in partly closed position, and
the auxiliary valve thereof in open posi-
tion. Fig. 2 is a transverse section taken.
&5 in the plane indicated by the line 2-2 of
Fig. 1, looking toward -the left. Fig. 3 is a
transverse section taken in the plane indi-
cated by the line 3=3 of Fig. 1, looking to-
ward the left, and showing one of the open-
40 ings in the valve seat. Fig. 4 is a detail
view showing the angular formation of the
outer portion of the main-valve stem, and
also showing the two stops and the lug be-
tween the same.
45 Similar numerals of reference designate
corresponding parts in all of the views of
the drawings.
The body casing of our novel cock com-
prises an inner member 1, and an outer
50 member 2, the outer member being detach-
ably connected with the inner member, pref-
erably by a thread 3, as shown in Fig. 1.
The inner member 1 is provided with a re-
duced and threaded portion 4 that is
55 threaded into the wall 5 of the water leg
or other suitable part of the boiler. In thesaid portion 4 is a valve seat 6, that is
preferably beveled, as shown, and on said
portion 4 and designed to rest within the
boiler is a cage 5a having openings 7, and 60
also having a diametrically disposed stop
8, the inner end of the said cage being open,
as illustrated.
Movable in the cage 5a and between the
valve seat 6 and the stop 8 is the auxiliary 65
valve 9 of our cock, which auxiliary valve 9
is equipped with a stem 10.
The outer member 2 of the body casingis
provided with, an outlet 11, and is also pro-
vided with an inner end portion 12 in which 70
are two diametrically opposite openings 13.
The inner end of the portion 12 forms a
seat 14 for the main valve 15 of the cock,
the said valve 15-comprising two wings ar-
ranged diametrically opposite each other so 75
that on rotary movement of the main valve
15 in one direction through -about a quarter
of a revolution, the wings will leave the
openings 13 in communication with the in-
terior of the member 1, while on a corre- 80
sponding movement of the valve in the other
direction the wings will effectually close the
openings 13 to the interior of the member 1
and the. boiler and in that way prevent the
escape of steam and water through the out- 85
let 11. The valve .15 is provided with a
central aperture 16 that loosely receives the
outer portion of the valve stem 10, and fixed
with respect to and extending outwardly
from the valve 15 is a stem 16a. This stein 90
164 is arranged snugly in a sleeve 17 of the
member 2, and consequently it will be mani-
fest' that while the said stem 16a can be
readily turned about its axis in the sleeve 17,
there is no liability.of steam or hot water es- 95
camping between the stem and the sleeve and
hence no necessity of employing packing.
In the stem 16a is a threaded bore and a
plain or smooth bore to receive the threaded
portion 18 and the smooth portion 19, re- 100
spectively, of a stem that under normal con-
ditions rests in the relative position shown,
and serves by engaging the stem 10 to hold
the auxiliary valve 9 away from its seat 6.
At its outer end the stem that has the thread- 105
ed portion 18 and the plain portion 19, is
provided with a head 20, and at.its inner
side the said head bears against a washer
21, which serves to retain a handle 22 on
the outer end portion of the valve stem 16a, 110
the said outer end portion, which is num-
bered 23, being preferably of angular form1,161,763.
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Reference the current page of this Patent.
Roach, John L. & Dawson, Lance L. Blow-Off Cock, patent, November 23, 1915; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth859204/m1/2/?q=%22%22~1: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.