US1041487A - Pneumatic action for musical instruments. - Google Patents

Pneumatic action for musical instruments. Download PDF


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US1041487A US55982410A US1910559824A US1041487A US 1041487 A US1041487 A US 1041487A US 55982410 A US55982410 A US 55982410A US 1910559824 A US1910559824 A US 1910559824A US 1041487 A US1041487 A US 1041487A
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musical instruments
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August De Kleist
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August De Kleist
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    • G10F1/00Automatic musical instruments
    • G10F1/02Pianofortes with keyboard


Patented Oct. 15, 1912.
\ A APPLICATION FILED MAY 6, 1910. 1,041,487, Y Patented oei-.15,1912
Specification' of Letters Patent.
rarenteu oet. 1s ,isla
Application filed May 6; 1310.` Serial No. 559,824.
To all trimm/t may concern.:
Be it known that I, AUGUST DE Kmns'r, a citizen of the United States, residingat North Tonawanda, in the county of Erie and State of New York, have invented new and useful Improvements in Pneumatic Actions for Musical Instruments, of which thel following is a specification. I
This invention relates to self-playing musical instruments having av pneumatic' action which is controlled by the usual perforated music sheet.
One of its objects is to Aimprove the wind chest of the action with a view of simplifyT- ing its construction7 reducing its cost and rendering itmore compact.
A further' object is to so construct the wind chest that access can be conveniently had to any of the valves of the pneumatic action without the necessity of dismembering the whole chest; and to construct the chest in sections in such manner that in the event otl any of its main parts splitting or otherwise becoming unserviceable, the detective parts can be readily replaced with-n out disturbing or renewing other parts of the chest.
ln the accompanying drawings consisting.
et two sheets: Figure l is a transverse section of the wind chest taken through one of the valve chambers. Fig. 2 is a similar section taken` through the exhaust conduit or connection of the chest. Fig. 3 is a frage mentary horizontal section. on line 3-3, Fig. l. Fig'. et is a rear view otheqhest With the motor pneumatics shown in section.
Similar letters of reference indicate corresponding parts throughout the ,set/'eral views.
The wind chest. comprises a main vertical or longitudinal front section A containing an hexhaust chamber which extends throughout the length of the chestJ and one or more longitudinal rear sections, valve-boards or bars C secured to the rear side of the front sectionli, one above "another, by screws l) or other suitable means.
As shown in the drawings,`tl main or front section of the chest comprises a front wall a, a rear Awall al, a top board a2, a bottom board or st z3j and end walls at.
D. indicates a. ti rer board of ordinary construction;A and E the customary motor pneumatics, the movable boards of which are connected with the usualr abstracts which actuate the parts of the piano-action plate o.
, cleats g or other sound shown in the drawings. y In the preferred construction shown. the
valve-boards C are separated toforni spaces which receive the front portions of the mo? tor pneumatics, the stationary top boards c of the latter being glued or otherwise secured to the underside of the corresponding valve board. Each of these valve-boards contains a row of valve-chambers g, one `for .each of the corresponding series ot' motor pneumatics. As shown in Fig. l7 each motor pneumatic is connectedwith the corre spending valve chamber by a port .fi preferably iormcd inthe bottom of the latter This valve chamber communicates with the outer atmosphere by one or more ports 'i preferably formed in its rear wall and with the exhaust chamber B by an exhaust port `j i'orrried in a plate J whichV covers the front end of the valve chamber. This plate is screwed or other rise removably secured to therear 'wallie1 oit the exhaust sectioni of the chest, so to be readily accessible upon removing the front board c of said section, which latter is secured place by screws a? or other apjgn'opriate tastenintas5 The air port c' and exhaust port of eachv valve cha'riber are controlled by the cusu tomary valves 7c, icl, both mounted on a stein 7a2 which is guided the rear portion of the corresponding valve board and in the l [a spring l appli:d to .thx valvestem between the air valve /t and a internal .shoulder or" the valve-board C servesto hold.
said valves in the normal position shown in Figs. and 3.
The front portion of each valve stern er@ tends into the exhaust chamber E and terminates in the usual button which bears against the pouch orpneumatic fm covering' a pouch chamber a in the inner side of the pouch-board or removable outer vail c ot' une vrind chest. Leading to each ol2 these pouch-chambers is a channel o which is connected with the corresponding duct et the traclrenbcard D by a tube 7). As shown in lfig. l, the channels 0 are lorincd partly in the upper portion of the pouch-board o and partly in the top board L2 ot the wind chest. The rear portions of the valve boards arc preferably secured toc/ether by or othersuitablc ind "he motor-pneumatics of cach row may likewise be tied together by a strip or producing members, not
lil() s indicates a suction troni; connected with y this type is well ymosphere enters the pouch the usual main bellows or pump of the instrument, not shown in the drawings, and leading to the exhaust chamber E, as seen in Fig.2. y
As the operation of pneumatic actions of understood, a brief description oit the operation of the present one will sutlce. ln the normal position of the parts, the air valves la are open, the exhaust valves .k1 'are closed and the motor pneumatics areexpanded. When a perforationo the music sheet registers with the corresponding tracker duct, the outer atchamber n through the channel o and reverses the position of. the pouch m', thereby opening the exhaust valve and closingthe air valve and placing the corresponding motor-pneumatic in communication with the exhaust chamber B. The pneumatic is thereby collapsed and caused to actuate the corresponding abstract f. When an mperforate portion of the music sheet closes said tracker-duct, the spring Z returns' the exhaust `and air valves to their former position, flushing the motor pneumatic and again intlating it in the usual manner.
ln order to adjust or regulate the valves of the action, it is only necessary to remove the front or pouch board a of the chest,
. while if it be desired to repair, clean or renew' any of the-2 valves, they can be conven y removing sald iently reached by simpl ouch board together with the guide4 plate J of the defective valve, thus affording ready access to the valves without requiring removal of other parts of the chest or they` pneumatic action and withouhpdisturbingj A any other parts.
ln case any of should ycheck or split in Y the defective board can he 1- anvenientiy screwed from the maii `section A of the valve-boards .or bars C the course of time,
ullthe Copies of this patent may be obtainedffor ve cents each, by addressing the cess thereto prising section and individually iront ends of said noemer chest and repaired or replaced by a new board without the necessity of disturbing or renewing any of the remaining valve boards or other parts, thus materially reducing the cost of such repairs and renewals.
It will be observed that this improved chest comprises comparatively ew parts and is exceedingly simple in construction, enabling it to be produced at small cost and to be repaired by ordinary mechanics. lt is moreover compact and narrowl from -itront to rear, leaw ing a correspondingly greater space between iit and `the piano-action or other sound producing parts of the instrument and permitting more 'convenient acfor adjusting purposes. l claim as my invention:
The combination. of a windchest coma section containing an exhaust chamber and having a removable front wall, a plurality vof separate valve boards securedV to the batik of the rear -wall of said removable therefrom, each of said valve boards containing al row bf valve `chambers extending through said rear wall and communicating with said exhaust chamber, guide platesl covering the valve chambers and containing exhaust ports, said plates being removably secured to the rear wall of said exhaust chamber, air and exhaustvalves in said valve chambers having their stems guided in said removable plates, motor pneumatics connected with said valve chambers, and operatinl diaphragpnsl for said valves applied to the innerl sideJ of sai removable front w'all.
Vitness my hand 'this 3d day v0i! AUGUST. DnKLElST. Witnesses:
(llommissioner of latents,
-Washingtom D. C.
US55982410A 1910-05-06 1910-05-06 Pneumatic action for musical instruments. Expired - Lifetime US1041487A (en)

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