US968291A - Pneumatic action. - Google Patents

Pneumatic action. Download PDF


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US968291A US43954308A US1908439543A US968291A US 968291 A US968291 A US 968291A US 43954308 A US43954308 A US 43954308A US 1908439543 A US1908439543 A US 1908439543A US 968291 A US968291 A US 968291A
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Bartholomew T Treahy
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Bartholomew T Treahy
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    • G10F1/00Automatic musical instruments
    • G10F1/02Pianofortes with keyboard


968,291 Patented Aug. 23, 1910.
Patented Aug. 23, 1910.
A [for/1e y s UNITED s'rATns carton.
nAntrHoLoMnw-T. rnnenr, or DETROIT, raronioen.
Application filed-June QB, 1898.
T 0 all whom it may concern:
Be it known that I, BA'nrHoLonnW T. TREAHY, a citizen of the Dominion of Canada, residing at Detroit, in the county of lVayne and State of Michigan, have invented certain new and useful Improveplayer action using a controlling valve or.
gate to change from the full to restricted tension or exhaust, or vice versa.
The invention is illustrated in the accompanying drawings, in which Figure 1 is-a vertical cross section of an action with the invention applied thereto. Fig. 2 is a vertical longitudinal section of the same. Figs. 3 and t are enlarged details of the controlling valve. Figs. 5 and 6 are enlarged details of the operating valve and its pneumatic. Fig. 7 is a detail in section of an intermediatejvalve box.
Referring specifically to the drawings, 6 indicates a tracker board over which the music sheet passes and which has an opening at each side of the'regular air passages which openings are connected by tubes A and B to the controlling valve, the tube A,
say, for the bass register and the tube B for the treble. The valve, which is a piston valve indicated at 7, has ports controlling both tubes, the valve being operated by a a description of one will answer for both.
Said tube, A, is connected to a pneumatic D in a compartment M in a valve box 8, which compartment is connected by a tube L to the main vacuum chest 9 of the bellows action. The pneumatic D, located in chamber M, operates a flap valve 10 covering a port 11 between the compartment M andan upper compartment N in the valve box 8, and said flap valve 10 also carries a disk valve 12 controlling an opening 13 in the top of the valve box. The upper coinpartment N is connected by a tube K to a Specification of Lettersiatent.
Serial .Ttfe.
pneumatic which is connected to and controls the valve G which is located in the main valve box 14- through which air is exhausted from the. action via pipe 15. The valve G controls the pipe 16 through which direct communication is had between the action and the main exhaust, indirect or regulated communication being had through pipe 17 by the well known automatic regulator. W hen the valve 7 is closed the acceutuating devices herein described are cut out, or inoperative, and the instrument operates as usual, that is, as if no pneumatic accentuating devices existed, with either directexhaust through the pipe 16 or indirect or regulated exhaust through the pipe 17, valve Gr being accordingly opened or closed by lever 19 and connections, as desired.
To put the autopneumatic' accentuating devices into condition for action, the valve G is first closed by throwing lever 19 which places action under indirect or regulated exhaust through tube 17 and the ordinary governor.
The knob (1 being then drawnplaces pneumatic H inline of action so it atented Aug. 23, 1910.
can open valve G at any desired point and thereby throw in the full tension and cause accentuation. lVhen valve .7 is open the air entering through the perforations of the music sheet passes through the tubing A and A and B and B and .(on one side) to the pneumatic D which-being in the vacuum space M thereby obtains relief and becomes inflated, in which position it opens valve 10 and closes valve 12 which operation converts the chamber N into a vacuum chamber by reason of its connection through The lever 19 is connected to valve G by a lifting crank .20 Working through the side of the valve boa: 1 t. The spring 18 lsmerely to seat valve snugly or assist gravity.
The pneumatic D is deflated by the usual small bleed passage to the exhaust chamber M.
I claim:
In an auto-pneumatic musical instrument, having an action and a main exhaust the combination, with a tracker; of a valve box having a ported partition therein, to divide the interior of the box into upper and lower compartments, the top of said box having a port communication with the atmosphere; a pneumatic located in the lower compartment; direct duct communications between said tracker and pneumatic through said lower compartment; a valve located in the upper compartment and directly connected to said pneumatic for controlling the port in said partition; a secondary valve located in said upper con'ipartment and directly connected to the first named valve, for controlling the atmospheric port; a valve casing located immediately in the line of ductcommunication with said lower compartment; a pneumatic in direct duct communication with said upper compartment; a main valve box havin a pipe connection with the action, and irect and regulated pipe connections with themain exhaust and a tension valve located in the main valve box and directly connected to the last-mentioned pneumatic, said tension valve controlling the exhaust through said direct pipe communication. i In testimony'whereof I afiix my signature, in presence of two witnesses.
US43954308A 1908-06-20 1908-06-20 Pneumatic action. Expired - Lifetime US968291A (en)

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