IMPROVEMENTS IN PUMPS, PART OF WHICH IMPROVEMENTS ARE ALSO APPLICABLE TO FORMING FLUID TIGHT JOINTS BETWEEN MOVING PARTS OF MACHINERY."
Year: 1882

page_text: LETTERS PATENT to George Vincent Fosbery, of Upton House Britton, near
Bristol, Lieutenant Colonel, for an invention of "IMPROVEMENTS IN PUMPS,
PART OF WHICH IMPROVEMENTS ARE ALSO APPLICABLE TO FORMING FLUID
TIGHT JOINTS BETWEEN MOVING PARTS OF MACHINERY."
PROVISIONAL SPECIFICATION left by the said George Vincent Fosbery
at the Office of the Commissioners of Patents on the 14th March 1882.
GEORGE VINCENT FOSBERY of Upton House Britton near Bristol Lieutenant
Colonel "IMPROVEMENTS IN PUMPS, PART OF WHICH IMPROVEMENTS ARE ALSO
APPLICABLE TO FORMING FLUID TIGHT JOINTS BETWEEN MOVING PARTS OF
MACHINERY,"
This Invention has for its object improvements in pumps part of which improve-
ments are also applicable to forming fluid tight Joints between moving parts of
machinery.
This Invention relates to water and air or gas pumps of the type known as
diaphragm pumps.
It consists of substituting for the ordinary diaphragm which is usually a flat disc
of india rubber or other suitable substance a double ring or tube formed of like
material.
In some cases this double ring is formed by a U shaped indentation or fold of
the diaphragm corresponding to the space between the piston and walls of the said
pump the upper part of the U being attached on one side to the piston and on the
other to the pump and a guard being formed on the piston in such a manner that
when the latter is operated in the direction of the bend of the U, the part of the
diaphragm lying against the piston is turned over and lies against the pump
and when the piston is operated in the opposite direction the contrary takes
place.
In other cases I form in the substance of the diaphragm a tube consisting of
two U's laid with the open part of one against the open part of the other forming
an annular flattened tube closed on all sides and I fill this tube with air or liquid
D.. 631

page_text: at pleasure And I attach the said tube on the one side to the body or barrel of
the pump or engine at the point where the U's are united. And I attach the other
or inner side at the same point to the piston so that when the piston is operated
in either direction the one U is unrolled from the pump and rolled on to the piston
and the other U or half tube behaves in the contrary manner and I thus provide a
means of keeping the joint between the piston and barrel absolutely tight and
I obtain without friction a longer and more effective stroke than is possible with
diaphragms differently constructed.
And I may apply the same U shaped ring or tubes to the keeping tight of any
joint where motion of the parts is required of whatever form the said parts
may be.
And for the use of the said improved tubular diaphragm as a double acting
pump. I employ a pump body cast solid with its foot and valve boxes, exit and
entrance pipes fulcrum for lever and stuffing box and I provide it with a flange
on the inner side to which the said diaphragm is secured by a ring and screw
bolts.
And I provide a cover for the said body cast with a tubular guide for the piston
rod and secured to the body by nuts and bolts.
Or I may cast the body in two halves each having its valve box and water ways
cast upon it the said halves being secured together by bolts and nuts and including
between them the outer flange of the tubular diaphragm.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said George Vincent Fosbery in the Great Seal Patent Office on the
14th September 1882.
GEORGE VINCENT FOSBERY of Upton House Britton near Bristol Lieutenant
Colonel "IMPROVEMENTS IN PUMPS PART OF WHICH IMPROVEMENTS ARE ALSO
APPLICABLE TO FORMING FLUID TIGHT JOINTS BETWEEN MOVING PARTS OF
MACHINERY."
This Invention has for its object improvements in pumps part of which improve-
ments are also applicable to forming fluid tight joints between moving parts of
machinery; and relates especially to the construction of the flexible diaphragm by
which the barrel and piston of such pumps are connected.
The general arrangement of my improved pump is shown by the Figures 1 and 2.
These figures represent vertical sections of the pump. They are taken at right
angles the one to the other.
a, a, is the barrel of the pump; it is convenient that it should be of cylindrical
form. b. is the piston and c. the piston rod. The rod c, is actuated by a lever d.
having a double fulcrum upon the pump body. The lever is divided where it
receives the rod c. and a pin is passed through it and also through the head of the
rod. The lever is slotted for this pin. From the peculiar arrangement of the
double fulcrum the movement of the lever at the part adjacent to the pin is nearly
rectilinear so that the slots are short and there is but little friction upon the pin.
The piston rod passes through a stuffing box at e. and is guided by the cover at its
other end. is the flexible diaphragm connecting the piston with the barrel, this
part is further illustrated by the Figures 3 and 4. To each compartment of the
pump there is an inlet passage, each with its valve g. 9. and similarly each com-
partment has its outlet with its valve h or h¹. i i is an additional valve to ensure
the pump remaining full when it stands out of use.
In Figure 3 some of the parts are shown in transverse section to a larger scale.
a is a portion of the barrel and b. a portion of the piston. k is the flexible
diaphragm; in this case its sectional form is that of a single U. It is of india
rubber moulded to form and vulcanised. The outer edge or flange of the U is
nipped between two metal rings land m. These rings may conveniently be drawn
together by tap screws and by nipping the india rubber they expand it and form a
tight joint against the barrel. a¹ is a projection within the barrel to keep the
diaphragm in place; the ring l. is kept up to this projection by studs upon the
cover extending into the barrel and abutting against the ring m. The flexible
diaphragm is similarly connected with the piston except that one ring n only is
employed, the edge of the piston itself taking the place of the other ring. The
rings m and n. carry upon them the guards m³ and n¹. along which the diaphragm
during the motion of the piston rolls to and fro. These guards serve to retain the
diaphragm truly in its place and prevent any other movement but that of the parts
of the diaphragm passing in succession from a straight to a curved form and vice
versa.
Diaphragms so arranged will allow a long range of movement and the control
and support which they receive renders them durable.
Another form which I usually prefer is represented by the Figure 4. It consists
of two diaphragms similar to the preceding put face to face cemented together by
their edges. The space enclosed is filled with water or it may be other fluid.
Guards are by preference employed and on both sides of the diaphragm; nevertheless
the diaphragm may be used without guards.

page_text: In cementing the two parts of the diaphragm together a small opening is left
for the introduction of water. These double diaphragms filled with water are
capable of working advantageously under a higher pressure than the diaphragms
heretofore employed.
Diaphragms of this description may be employed in many cases in place of
stuffing boxes where it is necessary to form a fluid tight joint between moving
parts.
Having thus described the nature of my said invention and the manner of
performing the same I would have it understood that I claim -
First My improvements in pumps substantially as described.
Second-My improved diaphragm U form in section in combination with its
guards substantially as described.
Third My improved double diaphragm enclosing a space containing water or
other fluid substantially as described.
In witness whereof I the said George Vincent Fosbery have hereunto set
my hand and seal this Fourteenth day of September in the year of our Lord
One thousand eight hundred and eighty two.