US877080A - Mechanical musical-instrument player. - Google Patents

Mechanical musical-instrument player. Download PDF


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US877080A US28918505A US1905289185A US877080A US 877080 A US877080 A US 877080A US 28918505 A US28918505 A US 28918505A US 1905289185 A US1905289185 A US 1905289185A US 877080 A US877080 A US 877080A
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Berndt Alfred Hoglund
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Berndt Alfred Hoglund
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    • G10F1/00Automatic musical instruments
    • G10F1/02Pianofortes with keyboard


&\\\\\\\Y\\\\\\\\\\\\\\\\\\\\\\\ PATENTED JAN. 21, 1908.
Specification of Letters fPat ent.
.PatentedJ'an, 21, 1908.
Application filed November Z7. 1905- Serial No. 289,185.
To all whom it may concern:
Be it known that I, BERNDI ALFRED HOGLUND, a sub ect of the King of Sweden,,
residing at New York city, in the county and State of New York, have invented certain new and useful Improvements in Mechanical Musical-lnstrument Players, of which' the following, taken in connection with the accompanying drawings, is a full, clear, and exact specification.
My present invention has relation to that class of devices employed for mechanically playing musical instruments and particularly to such as are operated through the medium of external air pressure.
The principal objects of my invention are to provide a simple, cheap, efficient and readily adjustable appliance whereby the tension of the atmosphere in the tubes may be automatically restored to the proper con dition after it has been utilized in effecting the operation of the mechanical player, and to render the player easily operable by employing tubes of small diameter in connection with the tracker.
To accomplish the above named objects and to secure other and-further advantages in the matters of construction, operation and use, my improvements involve certain new and useful arrangements or combinations of parts and peculiar features of con struction, as will be herein first fully described and then pointed out in the claims.
In the accompanying drawings forming part of this specification I have illustrated only so much of a mechanical musical instrument player as will sufiice for the proper understanding of my improvements.
Figure 1, is a vertical section and elevation showing part of a mechanical player with air tubes in place and my improvements applied in connection therewith and in connection with the striking mechanism.
Fig. 2, is a sectional elevation on a larger scale showing the general details of construction and arrangement of one of the pneumatics of the player and my improved bleed-- ing device in place in connection therewith.
Fig. 3, is a horizontal section and plan viewon planes through the broken line 3-3 of Fig. 2. Fig. 4, is an enlarged detail view in section and elevation of the )erforated tube as it appears when detachec from the box and from the flexible tube with which. it is intended to be connected.
In all these figures like letters of reference,
wherever they occur, indicate corresponding parts. I
In these n'rechanisms the devices which are operated by air are ordinarily known as pneumatics whatever may be their form or construction.
A represents one'of the sticks connected with one of the keys, as B, ofthe musical instrument. hen the instrument is to be played by mechanical ncans each one of these sticks is connected with a suitablc pneumatic by which it caused to rise and fall at the proper time to strike the note.
C, C, C, are pneumatics in the form pi ordinary bellows, the mechanical player having one for each finger key orior each stick,
each being connected with its appropriate stick as by a projecting piece 1 1) represents the ordinary tracker over which a perforated music'sheot is moved at a determined rate, and connected with this tracker are'llexible tubes, as E, each leading to a valve chest F.- I
By suitable means air is being constantly exhausted from the v'alve chests while the player is in operation, and the tubes E each convey a small quantity ofair from the tracker to operate the primary pneumatics which control the power pneumatics and allow the bellows C to collapse under external pressure and thereby strike the desired note. Thls general operation so far referred to 1s now well understood.
I einploy'a small valve mechanism in thereforebe made small and the operating device fnade compact and more sensitive.
In chest G a diaphragm l) carries a valve 0, the latter being arranged to normally close the port leading to the interior of bellows C. When this'valve is elevated, as it will be as soon-as air is admitted to the underside of diaphragm 1), air is exhausted from bellows C, which instantly collapses, causing the note to be struck and then instantly returns to its normal distended position.
To admit air to the underside of the diaphragm b which is comparatively large, I employ a smaller diaphragm d in chest F, the same carrying two valve diskse and f, arranged to open or close the passages leading exterior air andadmits a suflicient quantity of air to the underside of the larger diaphragm b, the valvee being closed against its seat by the same movement. When the supply of air to the undersideof diaphragm (T is cut ofl, then it falls or is drawn d own, and
the ports resume their normal. position.
Each tube E communicates with the space below the corresponding diaphragm cl; and
when air is admitted to tube E the tension of the airwithin the tube is changed and it is necessary and desirable for proper operation that this tension be restored as quickly as may be, so that the next timethe tube is opened to the exterior air, its contents wi not interfere with the proper admission of another supply. I therefore connect each tube E with a metallic tube H seated in chest F and opening beneathdiaphragm d, and in tube H I make asinall perforation, .as at 9, located so as to register with a channel leading to the space above diaphragm 11. After air is admitted through tube E to the underside of diaphragm d and the tubeclosed at the tracker, then exhaustion takes place through the opening 9 and the pressure of air in tube E is reduced or equalized with that in chest i This equalization of the pressure within tubes E is called bleeding the tubes, and the bleeding is satisfactorily accomplished by the means shown and in the manner stated.
Tube ii is seated in the Wall of chest F as indicated in Figs. 2 and 3 and so that it may be turned in its seat to regulate the eii'ective size of the opening 9, the same being reduced or enlarged according to the position of the opening in respect to the wall of the communicating channel. By this simple means the desired regulation'can be easily efi'ected trom The construction is simple and cheap and in all respects is found to answer the purposes or objectsof the inventionhereinbefore attended to.
Having now fully described my invention, what I claim as new herein'anddesire to secure by Letters'Patent, is: I l
1. In a mechanical musical instrument player, the combination of the striking pneumatic, the main valve chest contaimng a pneumatic for effecting the direct admisslon of air to the said striking pneumatic, a second and separate valve chest containing a pneumatic for eiiecting the direct admissiqn of air to the pneumatic in the main valve chest and an adjustable perforated tube for admitting air to the pneumatic in the second valve chest, the two valve chests being 10- cated and arranged side by side, substantially as shown and described.
2. In a mechanical musical instrument player, the-combination with the main valve chest containing a diaphragm, and asecond and separately constucted valve chest also containing a diaphragm, of an adjustable air conducting tube extending below and opening below the diaphragm in the second valve chest, said tube having also a perforation arranged to communicate with the space above said diaphragm, for the purposes explained.
In a mechanical musical instrument player, the combination with the main valve the exterior of the valve chest and. without the side of the other, as-indicated, so that the parts in either may be reached without disturbing those in the other.
chest containing a diaphragm, and a second and separately constructed. valve chest also containing a diaphragm, of an adjustable metallic air conducting tube extending below and opening below the diaphragm in the second valve chest, said tube having also'a perforation arranged to communlcate with the space above the said diaphragm and\ being. seated in a perforation'm the wall of the valve chest, substantially in the manner and for the purposes set forth.
. In testimony whereof, Ihave signed my name to this specification in the presence of two subscribing witnesses.
BERNDTALERED acetone. Witnesses:
US28918505A 1905-11-27 1905-11-27 Mechanical musical-instrument player. Expired - Lifetime US877080A (en)

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