Improvements in Mechanical Organ Blowing.
Year: 1893

page_text: Date of Application, 3rd Aug., 1893
Complete Specification Left, 3rd May, 1894-Accepted, 9th June, 1894
PROVISIONAL SPECIFICATION.
Improvements in Mechanical Organ Blowing.
FREDERICK WILLIAM DURHAM Engineer and JOHN HENRY MOYSEY
Engineer both of 183 Bow Road Bow London E. do hereby declare the nature
of this invention to be as follows:
Our invention relates to an automatic differential motion for transmitting the
power from a motor to the bellows of an organ, to accomplish which we make a
connecting rod consisting of two levers jointed at each end and coupled together
in the middle forming a third joint, generally known as a toggle joint so arranged
that when the levers are in a straight line or thereabouts they form a rigid
connecting rod, one of the levers has under the middle joint an inclined plane so
that on a roller being raised to the level of the start of the inclined plane the
reciprocating motion imparted to the rod by its being connected to the motor or
intermediate gear at one end and to the feeders at the other causes the inclined
pline of the toggle joint to mount up on the roller so that on its return stroke, the
centre joint being above the line of motion the rod ceases to do any work but
nply works the toggle joint loosely-the roller is brought up into position or
lowered as may be required automatically by a pueumatic bellows supplied with
pressure of wind from the main bellows by a valve which is opened or closed by
the position of the reservoir of the main bellows, or it may be mechanically
connected. We also couple a drawstop action from the key board, with the roller
so that in addition to its working automatically the roller can be thrown in or out
of gear at will by the player (we may also use a second toggle joint for raising or
lowering the roller)-thus enabling the player to have the wind either in or out of
the bellows as may be desired-or we may use any form of what is generally known
as a broken connecting rod or a clutch in combination with the automatic gear
herein before mentioned; in some cases it is necessary to place the feeders or
bellows at some distance from the organ itself in which case the wind supplied
would be of a considerably lower temperature than that of the atmosphere in
which the pipes of the organ stand, the passage of such cooler air through them
would put them out of tune to obviate this we take an air supply trunk or tube
from the organ chamber to the chamber containing the feeders or bellows which
chamber we make practically air tight, by this plan we draw the supply of air to
the feeders from the organ chamber itself, by this means simply circulating the
wind at a practically even temperature so avoiding putting the pipes out of tune
and preventing the pumping of cold air into the building containing the organ.
Dated this 2nd day of August 1893.
FREDK. W. DURHAM.
JOHN H. MOYSEY.
COMPLETE SPECIFICATION.
Improvements in Mechanical Organ Blowing.
0 We, FREDERICK WILLIAM DURHAM, Engineer, and JOHN HENRY MOYSEY,
Engineer, both of 183 Bow Road, Bow, London, E. 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 :-
Our invention relates to an automatic differential motion for transmitting power

page_text: from a motor to the bellows of an organ, as we shall describe referring to the
accompanying drawings; Fig. 1 shewing diagrammatically in elevation partly in
section, and Fig. 2 shewing a part'plan' of apparatus according to our invention
for this purpose.
To a reciprocating rod A moved to and fro by the motor we connect the rod B
which moves the bellows through a pair of toggle limbs: C and D jointed together
at E with a joint which allows flexure of the toggle upwards but not downwards.
We form the limb C with an incline on its underside which, in the position of
the parts shewn in Fig. 1, that is to say when the rod A is at the extreme of its
stroke to the left, is over a roller F mounted in vertically guided bearings and
jointed to the upper of a pair of toggle limbs G and H, the middle joint of which
is linked to a pneumatic lever or small bellows K. So long as the toggle limbs G, H,
remain in the position shewn in Fig. 1 the two limbs C, D, the joint E of which
is a little below the line of thrust, remain in position to convey the motion of A to B.
But when the wind chest is sufficiently fed by the bellows a moveable part of it
by opening a valve causes the bellows K to be inflated, then the toggle limbs G
and H are straightened and lift the joint E, and thereupon the thrust of the rod A,
instead of being effective on B to work the bellows, merely causes the limbs C
and D to bend up as indicated by the dotted lines C and D'.
Instead of straightening the toggle limbs G H by the inflation of a pneumatic
lever or bellows K, they may be straightened by a rod or cord conveying a pull or
push from the moveable part of the wind chest, thus operating automatically, or
from a stop-slide or handle at or near the organ, by which the organist or an
attendant can throw the bellows out of action as above described.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
:--
In mechanical organ blowing apparatus, connecting a reciprocating rod worked
by a motor to a rod working the bellows, by a pair of toggle limbs arranged and
operating, substantially as and for the purpose set forth.
Dated this 3rd day of May 1894.
ABEL & IMRAY,
Agents for the Applicants.