IMPROVEMENTS IN AIR OR GAS COMPRESSING ENGINES
Year: 1884

page_text: EDWARD HOLT Radcliffe near Manchester in the County of Lancaster Engineer
do hereby declare the nature of my invention for IMPROVEMENTS IN AIR OR
GAS COMPRESSING ENGINES to be as follows:-
This invention relates to air or gas compressing engines in which either single
or double acting compressing cylinders are employed, and has for its object
improvements in inlet valves of pumps used for compressing air or gases, and a
means of connecting them together that as one openes the other closes, and vice-
versa, as described in my specification 2710 of 1881.
These valves are of the disc form with two seats formed on each of them, one
larger in diameter than the other, and an hole in their centre of sufficient diameter
to allow the piston rod to pass through, and leave an annular space for the
admission of air or gas into the cylinders. They are mounted one in each cover of
the cylinders concentrically with the air or gas compressing pistons, and supported
by a series of steins in tubes fixed in the covers. The outer ends of these stems
are connected to rings or cross bars outside the covers, said, rings or cross bars
being coupled together by adjustable connecting pieces, in the covers are cast
openings or passages for the passage of air or gas on entering the cylinders. This
mode of connecting inlet valves together also relates to any number of small valves
placed in the cylinder covers of air or gas compressing engines.
+
Dated this 14th day of October 1884.
EDWARD HOLT,

page_text: COMPLETE SPECIFICATION.
I, EDWARD HOLT of Radcliffe near Manchester in the County of Lancaster,
Engineer, do hereby declare the nature of my invention for "IMPROVEMENTS IN
AIR OR GAS COMPRESSING ENGINES," and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement:
This invention relates to air or gas compressing engines, in which either single
or double-acting cylinders are employed, and has for its object improvements in
inlet valves of pumps.used for compressing air or gases and a means of connecting
them together so that as one opens the other closes and vice versa, as described in.
the specification of Letters Patent N° 2710 granted to mo A.D. 1881.
These valves are of the disc or annular form with two concentric seats or faces
formed on each of them, one larger in diameter than the other and with a hole in.
their centre of sufficient diameter to allow the piston rod to pass through and yet
leave an annular space for the admission of air or gas into the cylinders. These
valves are mounted one in each cover of the cylinders and concentrically with the
air or gas compressing pistons, and are supported by a series of stems in tubes
*fixed in the cylinder covers. The outer ends of these stems are connected to rings
or cross-bars outside the covers and which are coupled together by adjustable
connecting pieces. In the covers are also cast openings or passages for the passage
of air or gas on entering the cylinders: This mode of connecting inlet-valves
together also applies to any number of small valves placed in the cylinder covers
of air or gas compressing engines.
On the accompanying drawing Fig. 1 represents a side view of a pair of single-
acting compressing cylinders-one of them being in section and embracing my
improvements.
.
Fig. 2 is a plan view of the same.
Fig. 3 is a side sectional view Fig. 4 a plan and Fig. 5 an end view of a double
acting cylinder also embracing my improvements and Fig. 6 is a transverse section of
Fig. 3 shewing the valve removed.. Fig. 7. is a front view of the improved
valve alone. In all the views A is the cylinder B the piston and C the piston
E E are the
rod passing through stuffing boxes D in the ordinary manner.
improved inlet valves which are of an annular form and each having a pair of
concentric faces e and e! one larger in diameter than the other as seen more clearly
in Fig. 7 the hole F in the centre being large enough to allow the piston rod C to
pass through and also leaving sufficient space surrounding the same for the free
passage of air or gas entering into the cylinder. These improved inlet-valves E E
are mounted upon a pair or series of stems G which pass through' tubes H fixed in
the cylinder cover I to the outside where their outer ends are connected to rings
or cross-bars J coupled together by adjustable connecting pieces K so that as one
valve in the one cylinder cover opens the other valve in the other cover closes and
vice versa. By thus joining the two inlet valves together I am enabled to dispense
with the usual springs and with the vacuum which has hitherto 'been necessary to
open and keep open the inlet-valves of air or gas compressing engines. India
rubber washers L are introduced between the cross-bars and the screw-nuts on the

page_text: stems G to deaden the blow and prevent noise. Between the two concentric faces
or seats of the valves are openings M formed through the cylinder covers I for the
admission of air or gas to the cylinder and by forming annular orifices P in the
pistons as illustrated I am enabled to run the piston nearly up to the cover leaving
little or no dead space in the cylinder. It will thus be observed that these
improved annular valves are illustrated as mounted one in each cover of the
cylinder and concentrically with the air or gas compressing pistons but it will be
apparent that this mode of connecting my improved inlet-valves together is also
applicable to other descriptions of valves and to any number of small valves
arranged in the cylinder covers of air or gas compressing engines.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1st The application to air and gas compressing engines of my improved inlet-
valves mounted upon studs or stems in the cylinder covers coupled together
substantially as and for the purposes herein before described and illustrated on the
accompanying drawing.
.
2nd Coupling together the inlet-valves of air and gas compressing engines
substantially as and for the purposes herein before described.
JOHN G. WILSON,
Agent for the Applicant.