IMPROVEMENTS IN DRAW OFF COCKS."
Year: 1882

page_text: LETTERS PATENT to Samuel Benjamin Goslin of 29 Albert Road Stroud
Green Road in the County of Middlesex Engineer. for an Invention of
"IMPROVEMENTS IN DRAW OFF COCKS."
PROVISIONAL SPECIFICATION left by the said Samuel Benjamin Goslin
at the Office of the Commissioners of Patents on the 2nd March 1882.
SAMUEL BENJAMIN GOSLIN of 29 Albert Road Stroud Green Road in the
County of Middlesex Engineer "IMPROVEMENTS IN DRAW OFF cocks
"
This Invention has for its object improvements in draw off cocks, suited especially
for domestic boilers and steam cylinders.
Accidents sometimes arise with high pressure domestic boilers from the pipes
becoming stopped by frost or otherwise, with the result that the pressure in the
boiler increases until the boiler bursts.
Now my improved draw off cock is designed to remove this danger. As well
as a draw off cock it is a spring safety valve and when the pressure is higher than
it should be, it opens of itself and relieves the pressure.
The body or shell of the cock is formed with a diaphragm dividing the inlet or
pressure side from the outlet and through this diaphragm there is a passage with a
seating for the valve by which the passage is closed and opened. The valve is a
disc valve and its stem passes up into a spring box which is capable of sliding in
a direction to and from the diaphragm, in a guide barrel formed upon the shell or
body. The spring box contains a coiled spring which is sufficiently stiff not to
yield to the ordinary pressure upon the valve, it bears upon a disc upon the valve
stem.
A spindle carries the spring box at its end and a screw thread upon the spindle
works in a female screw in the body or in
provided in the cover of the guide barrel.
maintain a tight joint around the spindle.
a nut which is received into a recess
Over the nut there is a stuffing box to
The spindle is provided with a head or

page_text: handle by which it may be turned to open and close the water passage. The
distance to which the spindle can be screwed down is limited by stop nuts which
The head or handle comes into
screw on to the exterior of the stuffing box cover.
contact with the stop when the spindle has been screwed in far enough to bring
the valve against its seat, but without further compressing the spring in the spring
box. When the spindle is turned in the contrary direction the spring box is
carried back away from the diaphragm and the valve is withdrawn from the
seat.
If when the valve is closed any undue rise of pressure should accumulate the
valve will rise from its seat, the spring in the spring box yielding and permitting
it to do so.
The spring within the spring box may be replaced by a weight or weights.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Samuel Benjamin Goslin in the Great Seal Patent Office on the
1st September 1882.
SAMUEL BENJAMIN GOSLIN of 29 Albert Road Stroud Green Road in the
County of Middlesex Engineer.-" IMPROVEMENTS IN DRAW OFF COCKS
"
This Invention has for its object improvements in draw off cocks, suited especially
for domestic boilers and steam cylinders.
Accidents sometimes arise with high pressure domestic boilers from the pipes
becoming stopped by frost or otherwise, with the result that the pressure in the
boiler increases until the boiler bursts.
Now my improved draw off cock is designed to remove this danger. As well as
a draw off cock it is a spring safety valve and when the pressure is higher than it
should be, it opens of itself and relieves the pressure.
The body or shell of the cock is formed with a diaphragm dividing the inlet or
pressure side from the outlet and through this diaphragm there is a passage with a
seating for the valve by which the passage is closed and opened. The valve is &
disc valve and its stem passes up into a spring box which is capable of sliding in
a direction to and from the diaphragm, in a guide barrel formed upon the shell or
body. The spring box contains a coiled spring which is sufficiently stiff not to
yield to the ordinary pressure upon the valve, it bears upon a disc upon the valve
stem.
A spindle carries the spring box at its end and a screw thread upon the spindle
works in a female screw in the body or in a nut which is received into a recess
provided in the cover of the guide barrel or in the barrel itself. Over the nut
there is a stuffing box to maintain a tight joint around the spindle. The spindle is
provided with a head or handle by which it may be turned to open and close the
water passage. The distance to which the spindle can be screwed down is limited
by stop nuts which screw on to the exterior of the stuffing box cover. The head
or handle comes into contact with the stop when the spindle has been screwed in
far enough to bring the valve against its seat, but without further compressing the
spring in the spring box. When the spindle is turned in the contrary direction the
spring box is carried back away from the diaphragm and the valve is withdrawn
from the seat.
If when the valve is closed any undue rise of pressure should accumulate the
valve will rise from its seat, the spring in the spring box yielding and permitting
it to do so.
The spring within the spring box may be replaced by a weight or weights.
In order that my said Invention may be most fully understood and readily
carried into effect I will proceed to describe the Drawings hereunto annexed.
DESCRIPTION OF THE DRAWINGS
Figure 1 is an elevation and Figure 2 is a section of a draw off cock constructed
according to my Invention.
a is the body or shell of the cock and a¹. a diaphragm dividing the inlet or
pressure side from the outlet. There is an opening in the diaphragm and a valve
seat around it; the valve b is provided to close this opening. The valve has an
elastic or ground in face and its stem which is in two parts passes up into a spring
box c.
The spring box c is contained in the guide barrel a³. forming part of the
body or shell a. d. is a spring which is held compressed between the cover of the
spring box and a flange upon the valve stem.

page_text: The cover of the spring box is attached by a screw e* to the spindle e. but so
that the sprindle may be able to turn freely without carrying the spring box
round with it. The spindle has a screw thread cut upon it at e'. and this engages
with a corresponding nut formed or fitted into the cover piece f.
g is packing applied around the spindle e it is contained in the stuffing box h.
which is screwed upon the upper part of the piece f. 2. is a head or handle
applied upon the spindle e and by which it is turned for the purpose of bringing
the valve to its seat or removing it therefrom. i, i are locking nuts upon the
exterior of the stuffing box h. they serve to limit the distance to which the spindle
is able to descend. By means of the lock nuts i, i. the cock is adjusted so that
when the spindle is screwed down as far as the nuts admit the valve b will remain
closed at the normal pressure but will lift and automatically relieve the pressure
when excessive.
The compression of the spring in the valve box when the flange upon the valve
stem is in contact with the bottom of the valve box corresponding to the minimum
pressure at which it is intended that the valve shall lift automatically. The valve
may be set to a higher pressure by lowering the lock nuts i, i. on the neck of the
stuffing box h. as above described.
Having thus described the nature of my said Invention and the manner of
performing the same I would have it understood that I claim my improved draw
off cock substantially as described:
In witness whereof I the said Samuel Benjamin Goslin have hereunto set
my hand and seal this thirtieth day of August in the year of our Lord
One thousand eight hundred and eighty two.
SAMUEL BENJAMIN GOSLIN. (L.S.)