AN IMPROVED HYDRAULIC ENGINE APPLICABLE FOR WORKING THE BELLOWS OF ORGANS AND HARMONIUMS, AND FOR OTHER PURPOSES WHERE INTERMITTENT MOTION AND VARIABLE SPEED IS REQUIRED
Year: 1871

page_text: LETTERS PATENT to William Holt, of Leeds, in the County of York,
Organ Builder, for the Invention of "AN IMPROVED HYDRAULIC ENGINE
APPLICABLE FOR WORKING THE BELLOWS OF ORGANS AND HARMONIUMS, AND
FOR OTHER PURPOSES WHERE INTERMITTENT MOTION AND VARIABLE SPEED IS
REQUIRED."
Scaled the 16th February 1872, and dated the 17th August 1871.
PROVISIONAL SPECIFICATION left by the said William Holt at the
Office of the Commissioners of Patents, with his Petition, on the
17th August 1871.
I, WILLIAM HOLT, of Leeds, in the County of York, Organ Builder,
do hereby declare the nature of the said Invention for "As IMPROVED
HYDRAULIC ENGINE APPLICABLE FOR WORKING THE BELLOWS OF ORGANS AND HAR-
MONIUMB, AND FOR OTHER PURPOSES WHERE INTERMITTENT MOTION AND VARIABLE
SPEED IS REQUIRED," to be as follows:-
This Invention relates to a prior Invention for improvements in
hydraulic engines employed for the same purpose, for which Letters
Patent were granted to one David Joy and myself the said William

page_text: intermediately of this lever is hinged at one end another lever whoso
mean position is parallel to the second named lever, and which is
mounted intermediately on an axis or shaft, the other end of said
lever forming an eccentric clip or pair of fingers placed at suitable
distances apart, which clip or span a boss or head fixed on the end of
the valve rod and a spring is applied to the first lever to act in sucht
manner that after the piston has arrived at one end of its stroke and has
forced the parallel levers slightly beyond the line of centres placing
the valve over the ports, the said spring acts to force the levers further
and thereby causes the clip to push the valve forward and open one of 1
the ports to admit the water to that end of the cylinder. On the return
stroke of the piston a similar action takes place, and so on. The action
of the spring in this movement of the valve in crossing the ports is
governed or controlled by a pneumatic valve (or a cylinder and piston)
compressing or forcing air, and which may be regulated by an adjustable 1
escape port.
In order that my said Invention may be clearly understood, I herein
give reference to two accompanying Sheets of Drawings of the appa-
ratus as constructed and applied in accordance with the said Invention.
A is the lever hinged at one end A' to the framework at A' (but which 2
may be hinged to the cylinder B), its mean position being parallel to
the piston rod C, and to this lever A is hinged another lever D, whose
mean position is at right angles to the former and in which is a slot
hole E through which a rod F carrying two tappets or bosses G and H
can work freely, this rod being connected by an arm I to the piston rod. 2
To the lever D is hinged another lever or arm J fixed on a shaft K on
which is also fixed an eccentric clip or pair of fingers L and M. These
fingers clip or span a boss N fixed on the end of the valve rod P, and
by which motion is given to the slide valve R to place it over or cover
both the inlet ports S and S', such being effected by the action of the 3
piston rod O upon the tappet rod F which places the connecting joint
of the levers D and J in a position a little beyond the line of contres
when a spring Q applied to the lever A continues or produces further
action on the said levers and they give further motion to the valvo R
opening the port 8 to admit the supply of water to that end of the 3
cylinder and opening the port 8' to the exhaust port S³ to allow the
escape of the water from the other end of the cylinder. On the return
stroke of the piston the reverse action on the valve takes place in a

page_text: similar manner as above described. To regulate or retard the action
of the spring Q a pneumatic valve or bellows T is attached by a rod U
to the lever A, which valve is alternately charged with air which has.
to be either compressed or forced by the spring through an escape port
or a series of perforations or apertures, and if only by one escape port as
at V a throttle valve W may be applied to regulate the time or speed
of the passage of the air out of the said bellows, and thus rendering the
action of the slide valve more regular and free from noise.
Having thus described the nature of the said Invention, and shewn
by Drawings and letters of reference thereto in what manner the same
is or may be performed or put into practice, I would have it understood
that I do not confine myself to the precise details in the construction
and arrangement of the mechanism or apparatus shewn and described;
but what I claim as of my Invention is, the combination and arrange-
ment of levers, tappets, and rods with spring and pneumatic valve for
working the slide valve of hydraulic engines in manner substantially as
herein described and shewn in the Drawings.
In witness whereof, I, the said William Holt, have hereunto
set my hand and seal, this Fifteenth day of February, in the
year of our Lord One thousand eight hundred and seventy-two.
Signed, sealed, and delivered by the
within-named William Holt, in the
presence of
Wч. TASKER,
Patent Agent,
Halifax & Bradford.
WILLIAM HOLT. (L.S.)