Improvements in Blowing Engines.
Year: 1895

page_text: Date of Application, 18th Mar., 1895
Complete Specification Left, 18th Dec., 1895-Accepted, 18th Jan., 1896
Improvements in Blowing Engines.
I, CHARLES HERBERT SCOTT, of High Orchard Iron Works, Gloucester in
the County of Gloucester, Engineer, do hereby declare the nature of this invention
to be as follows:-
i
According to this invention the admission of air to the respective ends of the
air compressing cylinder of a blowing engine is effected through openings or ports
formed in the cylinder wall at or near its ends and controlled by a cylindrical valve
or valves mounted to slide endways relatively to the cylinder and actuated by an
eccentric or other suitable means from a moving part of the blowing engine, the
arrangement being such that the opening of the air admission ports is effected
mechanically instead of by air pressure acting during the suction stroke of the
pump piston as heretofore usual. By this means I am able to provide a very large
opening for the admission of air to each end of the pump cylinder independently
of the effect of suction in the pump cylinder, with the result that I have been able
to run a blowing engine thus constructed at about four times the speed of an
ordinary one. My invention can be carried out in various forms.
In one arrangement, the air pump cylinder is formed with a circular series of air
ports near each of its ends these ports being controlled by an external cylindrical
valve in the form of a casing mounted to slide end ways on the cylinder and formed
with a corresponding circular series of slots or ports, packing or spring rings being
fitted between the cylinder and its movable casing to prevent escape of air from
between them. The casing is connected to and reciprocated by an eccentric on
the crank shaft of the blowing engine. The air delivery valves may be ordinary
circular valves having leather faces.
:
In a modified arrangement the slotted cylindrical valve is arranged inside the
air compressing cylinder and the piston is arranged to work inside it.
In each arrangement, instead of controlling the two sets of air admission ports
by a single cylindrical valve common to them, each set may be controlled by a
separate valve that may be in the form of a short cylinder or ring operated by an
eccentric or equivalent means from the crank shaft of the engine.
Dated this 18th day of March 1895.
Improvements in Blowing Engines.
I, CHARLES HERBERT SCOTT, of High Orchard Iron Works, Gloucester, in
the County of Gloucester, Engineer, do hereby declare the nature of this invention
and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement :-
According to this invention the admission of air to the respective ends of the

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air compressing cylinder of a blowing engine is effected through openings or ports
formed in the cylinder at or near its ends and controlled by a cylindrical valve or
valves that is mounted to slide end ways relatively to the cylinder and is actuated
by an eccentric or other suitable means from a moving part of the blowing engine.
By this means I am able to provide a very large opening for the admission of air
to each end of the pump cylinder independently of the effect of suction in the
pump cylinder, with the result that I have been able to run a blowing engine thus
constructed at about four times the speed of an ordinary one. By the construction
described I am also able to considerably reduce the clearance and thereby increase
the mechanical efficiency of the blowing engine. My invention can be carried out
in various forms.
In the accompanying illustrative drawings,
Fig. 1 is a vertical section showing the air compressing cylinder of a blowing
engine provided with a cylindrical valve according to this invention.
Fig. 2 is a section on the line x x of Fig. 1, the compressing piston being
removed.
In this arrangement, the air compressing cylinder 1 is formed with a circular
series of air ports 2 near each of its ends, these ports being controlled by an
external cylindrical valve 3 in the form of a casing mounted to slide endways on
the cylinder and formed with corresponding circular series of slots or ports 4,
packing or spring rings 5 being fitted between the cylinder and its movable casing,
preferably sprung into annular recesses in the exterior of the cylinder as shown,
to prevent escape of air from between them. The casing is connected by suitable
means, such as pins 6 carried by it and rods 7, to eccentrics by which it is
reciprocated so as to open and close the ports 2 at the required times, and which
are fitted on the crank shaft of the blowing engine. The air delivery valves 8
may be ordinary circular valves.
Instead of controlling the two sets of air admission ports by a single cylindrical
valve common to them, each set may be controlled by a separate valve that may
be in the form of a short cylinder or ring operated by eccentrics or equivalent
means from the crank shaft of the engine.
Figs. 3 and 4 are similar views to Figs. 1 and 2 respectively, showing an
arrangement of this kind. 3, 3ª are the two valves each in the form of a split
ring of channel section and fitted with an exterual ring 3° in which are springs 9
that serve to keep the valve tight up against the face or exterior of the cylinder
around the ports 2 during the compression of air in the corresponding end of the
cylinder. The two valves are connected together, through their rings 3*, by
vertical rods 10 by means of which they can be reciprocated by eccentrics or their
equivalent as in the arrangement shown in Figs. 1 and 2.
Figs. 5 and 6 represent a modified arrangement designed for higher pressures of
air than that for which the arrangements shown in Figs. 1 to 4 are designed. In
this case, each series of ports 2 is controlled by a valve similar to that shown in
Figs. 3 and 4, but made in a number of segmental parts and arranged to work
inside the cylinder against which it is kept tight during the compression of air in
the corresponding end of the cylinder by the pressure of the air, aided by the
springs 9 which serve to keep the parts of the valve in contact with the cylinder
during the suction strokes. Each valve is filled with a ring 3* by which the two
valves are connected together by rods 10 that pass through suitably packed holes
in the compressing piston 11 and are driven by eccentrics or their equivalent as
before.
Figs. 7 and 8 show a modified arrangement in which each of the internal
valves 3, 3ª consists of a solid ring between which and the interior of the cylinder,
an air tight joint is obtained by means of ordinary split packing rings 5*.
It will be obvious that each end of the cylinder can be constructed with a double
series of ports 2 in such a way that the valves will not only act as mechanically
operated inlet valves, as in Fig. 1, but also as mechanically operated delivery
valves.

page_text: Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is :-
1. A blowing engine in which the admission of air to the respective ends of the
air compressing cylinder is effected through openings or ports formed in the
cylinder at or near its ends and controlled by a cylindrical valve or valves mounted
to slide endways relatively to the cylinder and actuated from a moving part of the
engine, substantially as described.
2. Blowing engines having the air compressing cylinders formed with openings
or ports and provided with inlet valves constructed, arranged and operating
substantially as herein before described with reference respectively to and shown in
Figs. 1 and 2; in Figs. 3 and 4; in Figs. and 6; and in Figs. 7 and 8 of the
Dated this 18th day of December 1895.
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.