IMPROVEMENTS IN VALVES AND CONTROLLING GEAR FOR MOTIVE-POWER ENGINES AND AUXILIARY APPARATUS
Year: 1876

page_text: LETTERS PATENT to Henry Percy Holt, of Royal Insurance Buildings, Leeds, in
the County of York, Civil Engineer, for the Invention of "IMPROVEMENTS IN
VALVES AND CONTROLLING GEAR FOR MOTIVE-POWER ENGINES AND AUXILIARY
APPARATUS."
Sealed the 12th April 1876, and dated the 17th February 1876.
PROVISIONAL SPECIFICATION left by the said Henry Percy Holt at the
Office of the Commissioners of Patents' on the 17th February 1876.
HENRY PERCY HOLT, of Royal Insurance Buildings, Leeds, in the County of
York, Civil Engineer. "IMPROVEMENTS IN VALVES AND CONTROLLING GEAR FOR
MOTIVE-POWER ENGINES AND AUXILIARY APPARATUS.":
The first part of this Invention consists in the use of valves worked by controlling
power on or in moveable ported faces or seats which receive a reduced motion from
the piston of the engine or apparatus; the controlling valve admits the pressure, and
the face cuts it off when the piston has advanced to a position corresponding with
that of the controlling valve in either direction, and the piston is held in this
position until the position of the controlling valve is altered. The controlling
valve may be actuated by reversing levers with sector plates, notches, and catches,
by governors in the case of engines, or by any hand or power apparatus.
The second part of this Invention consists in an arrangement of pendulum kept
oscillating by the fall of pallets which are lifted by cams or tappets on the engine
main or a countershaft. This pendulum traverses the controlling valve, either
direct or through the medium of an auxiliary apparatus worked by valves as
described in the first part of this Invention.
These valves are applicable for controlling auxiliary cylinders for expansion or
reversing gears of steam engines, steering apparatus for ships, steam hoists, feeds
for machines, break apparatus for discharging waste water from cylinders, and any
other purposes.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Percy Holt in the Great Seal Patent Office on the 16th August
1876.
HENRY PERCY HOLT, of Royal Insurance Buildings, Leeds, in the County of
York, Civil Engineer. "IMPROVEMENTS IN VALVES AND CONTROLLING GEAR FOR
MOTIVE-POWER ENGINES AND AUXILIARY APPARATUS."
The first part of this Invention consists in the use of a slide valve or valves
(worked by hand or any controlling power for admitting or exhausting the motive
pressure) arranged on or in moveable faces with ordinary inlet and exhaust ports,
which faces receive a reduced corresponding motion from the piston of the engine
or apparatus, the controlling valve admits the pressure, and the ported face "cuts
off" the prossure when the piston has moved to a position in its stroke in either
direction corresponding with that of the controlling valve, and the piston is held
in that position by the admission or exhaust of the motive pressure by the moving
ported face at either end of the controlling valve (should the piston move slightly
in either direction) until the position of the valve is purposely altered.
controlling valve may be actuated by reversing levers with sector plates, notches,
and catches; by governors when used to to work expansion gears, or by any hand
or power apparatus.
The
In some cases, particularly when the auxiliary power piston has a short stroke,
the controlling valve works in or on an ordinary face with inlet and exhaust ports
arranged inside the piston, in which case no' intermediate moveable face is required,
this being supplied by the motion of the piston itself. The motive pressure
may be conducted to and from the piston in any convenient manner to suit
circumstances.
For driving pumps I use the valve arranged in the piston as just described, and
couple the valve to an oil or other cataract with an adjustable " throttle" to regulate
the speed of the valve, the ports from the cataract cylinder ends being arranged so
that the piston passes them..
In other cases the cylinder and ported face may move and the piston be
stationary.
The second part of this Invention consists in an arrangement of pendulum of a
length to suit the requisite speed of the engine. This pendulum is kept oscillating
by the fall of pallets, which are lifted by cams or tappets on the engine or a counter
shaft. This pendulum traverses the controlling valve (which works in connection
with a moveable ported face as described in the first part of this Invention) either
direct or through the medium of an auxiliary apparatus worked by valves as
described above.
The combined controlling valves and moveable ported faces are applicable to
auxiliary power cylinders and pistons for working expansion and reversing gears
of motive-power engines, for controlling the pistons of pumps worked by steam or
compressed air, for steering apparatus for ships, steam hoists, feeds for machines,
break apparatus, and any auxiliary power apparatus.
4
In order to assist the foregoing explanation of my Invention I herewith append
the accompanying Drawings in which the letters of reference apply to the following
parts
DESCRIPTION OF DRAWINGS.
Figures 1 and 2, Auxiliary Reversing Apparatus.-a, power piston imparting
motion to reversing or other lever b by means of connecting rod c; b, reversing
lever; c, connecting rod; d, moving ported face receiving a corresponding motion
to piston a from lever b by means of connecting rod e; e, connecting rod between
lever and moving ported face; f, controlling valve worked by hand lever g, by
means of rocking shaft h, and lever i; g, hand lever for working controlling valve f;
, rocking shaft; i, rocking lever forming connection between hand lever g and
controlling valve f.

page_text: Figures 3 and 4, Auxiliary Apparatus.-a, pressure inlet; b, b, auxiliary cylinder;
c, c, power piston containing pressure ports; d, d, d, controlling valve and rod;
e, e, hand lever for working controlling valve, d, d, d; f, f, links for connecting
reversing lever to power piston; g, g, exhaust ports and passages.
Figures 5 and 6, Power Pump or Compressor.-a, a, power cylinder; b, b, power
piston, containing inlet and exhaust ports; c, c, hollow piston rod for imparting
motion to pump piston, and for conveying pressure from pressure box or chest or
pipe e, e, to steam ports in piston b, b; d, d, hollow piston rod also for imparting
motion to pump piston and for conveying exhaust pressure from exhaust ports in
piston b, b, to exhaust chamber and pipe f, f; e, e, pressure box or chamber; f, f,
exhaust chamber; g,g, inlet exhaust and controlling valve; h, h, valve rod connected
to cataract piston i; i, cataract piston; j, j, cataract cylinder; k, l, ports to throttle b;
1, cataract throttle.
Figures 7 and 8, Motive Power Engine.-, a, moving ported face which receives
a corresponding reduced motion to that of the piston a, a, by means of the rocking
lever c, c, connecting rod d, d, and eccentric e, e, from the crank shaft of the engine;
c, c, rocking lever; d, d, connecting rod; e, e, eccentric; f, crank shaft of engine;
g, g, controlling valve worked by pendulum i, i, i, by means of connecting rod h, h;
,, connecting rod; i, i, i, pendulum; j, j, weighted palettes for imparting motion
to pendulum i, i, i; k, k, cam fixed on crank or countershaft for lifting palettes j, j.
Figure 9, Auxiliary Power Apparatus.-a, u, moving ported face receiving
motion corresponding to that of power piston by suitable means; b, b, controlling
valve worked by auxiliary piston c, e; c, c, auxiliary piston; d, d, secondary con-
trolling valve worked by hand, pendulum, or suitable gear from engine.
Auxiliary Steering Apparatus.-For auxiliary steering apparatus in many cases I
use the piston and valve arrangement shewn in Figures 5 and 6, and couple the
tiller chains on to the pressure inlet and exhaust trunks similar to those in Figure 9.
By this means the steersman can feel a portion of the strain on his helm which
varies as the pressure on the controlling valve. This may likewise be accomplished
as shewn in Figures 10 and 11, in which a, a, is the ordinary rudder connected to
the auxiliary power cylinder in any usual manner; b, b, secondary small rudder
connected to the controlling gear in any suitable manner; c, c, controlling valve
gear in working which the secondary rudder is put in motion and the steersman can
feel his helm; d, d, auxiliary piston and cylinder.
Having now described and shewn the nature of my said Invention, and some of
the manners in which it may be used or carried into effect, I wish it to be understood
that I do not confine myself to the precise details of arrangement which I have
described or referred to, as many inodifications may be made therefrom by merely
altering details without deviating from the principles or objects of the said Invention,
but what I consider to be novel and original, and therefore claim as the Invention
secured to me by the herein-before in part recited Letters Patent is-
Firstly. The combined use of controlling valves and moveable ported faces for the
purposes above as described and illustrated, also the arrangements for connecting
same.
Secondly. The use of a pendulum or cataract to control the valve arrangement
as described and illustrated, also the arrangements for connecting same.
In witness whereof, 1, the said Henry Percy Holt, have hereunto set my hand
and seal, this Fifteenth day of July, in the year of our Lord One thousand
HENRY PERCY HOLT. (LS.)