US8792A - Melodeon - Google PatentsMelodeon Download PDF
- Publication number
- US8792A US8792A US8792DA US8792A US 8792 A US8792 A US 8792A US 8792D A US8792D A US 8792DA US 8792 A US8792 A US 8792A
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- Patent type
- Prior art keywords
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- Expired - Lifetime
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
UNITE` STATES PATENT OFFICE.
A. L. SWAN, OF CHERRY VALLEY, NEVV YORK.
Specficaton of Letters Patent No. 8,792, dated March 9, 1852.
To a/Z whom it may concern:
Be it known that I, A. L. SWAN, of lherry Valley, in the county of Otsego and .State of New York, have invented certain new and useful improvements in Melodeons and Melo'pines and other Keyed W'ind Tnstruments of a Similar Nature; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming part of this specification, in which- Figure l, is a transverse vertical section of a melodeon, complete. Fig. 2, is a transverse vertical section of the air receiving box or chamber. Fig. 3, is a longitu'dinal vertical section of the same. V
Similar letters of reference indicate corresponding parts ineach of the several figures. I
My first improvement relates to the exhausting bellows or apparatus for causing a draft of air through the reed, and consists of a. new mode of construct-ing the air receiving' box which is in connection with or forms part of the exhausting bellows; by which three desirable results are obtained, viz: 1st. An exhausting apparatus so constructed is made to exhaust nearly double the quantity of air to that exhausted by an ordinary exhausting apparatus occupying the same space. 2nd. It produces a peculiarly strong and ringing-tone. 3rd.
It exhausts with equal power at all times,
' no matter what is the position of the movable flap or top of the receiving box, and thus the strength or power of a note is sustained uniform for as long a time as the apparatus remains exhausting.
My second improvement relates to a simple and convenient mode of working` the bellows or exhausting pump, by which the operation is rendered more easy to the player.
To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation commencing with the first named improvement.
A A represents the case of the melodeon, in the front part of which partitioned off by the board B running the whole length of the instrument the different parts are arranged in ordinary manner; therefore no description further than a slight reference is necessary.
C, is one of the finger keys which is shown pressed clown upon the movable vertical pin (o). This acts upon the valve D which is shown open.
cZ, is one of the reeds.
The back partv of the case extending the whole length of the instrument forms an oblong box E from which under the partition B thereis a passage b, leading to the valves and reeds; this box E is the air receiving box. The top F, or movable section of the box, is connected by wings c, o to its upper edges all around; these wings all fold inward toward the middle of the box and are of such dept-h as to allow the top F to descend nearly to the bottom of the box:
Gr, is the' spring for forcing up the top F and opening or expanding the inside of' H, is the valve leading to the pump or exhausting bellows which is the same as in other instruments having a valve I, in
the lower section J. I
The air is exhausted from the box E by the bellows or pump J and when the valves D, are opened the external air rushing into thebox in the direction of the arrows l, 1, causes the vibration of the reeds and produces the sound; in Fig. l, the box is sho-wn about halfpexhausted; in Fig. 2, the box is shown full of air, but the top is represented by the red lines as drawn down and the air nearly all exhausted. It will be understood that the spring is strongest when in the position shown in red lines in Fig. 2 and the box nearly exhausted and Weakest when the top is raised, and the box full of air. Now when the spring is strongest the top would rise quickest and cause the strongest current of air if its effect Were not by some means count-eracted, which it is by the action of the pressure of the atmosphere upon the wings c, c, whose tendency to close or contract the box increases with the tendency of the spring to open or expand it; being greatestwhen the top F is lowered and the box exhausted as shown by the red lines in Fig. 2 and decreasing as the top rises and the box fills with air, until when the box is quite full as shown in the same figure, and the spring is nearly or quite exhausted the pressure on the wings ceases. By this means the tendency of the top F to rise is always uniform and the draft or current of air is is this`uniformity of draft which is so great a desideratum in instruments of this kind and which is wanting in the ordinary exhausting apparatus, which is represented open in the diagram, Fig. ll, the red lines in the same figure representing` it closed. By referring to this figure it will be seen that the external pressure of the atmosphere upon the wings e, e tends to close or contract the receiving box K and this closing tendency increases the spring weakens, and becomes less able to overcome it, consequently the box expands or opens more slowly as it fills and the current of air becomes gradually weaker, producing a note which decreases gradually in strength until it almost dies away before the box is filled.
I will now proceed with the description of the second part of my invention. L, Fig. 1, is a treadle which is jointed at its back end by a pin to a Vibrating rod M, attached to the floor or to any suitable object below the instrument and also at about the middle of its length to a similar vibrating rod N, which may be of the same length as VI. A rod 0 connects the treadle to the lower or movable section of the exhausting bellows or pump. The spring inside the bellows always raises the treadle to the position inclicated by the red lines until it is depressed by other means. If the player placed his heel upon the floor at a suitable distance from the end of the treadle which he will soon determine by practice and keeps up a gentle rocking motion with his foot, the vibratory bars will be thrown back by the pressure of the foot and the treadle depressed so as to draw clown the movable section J, the spring raising it every time the foot is raised or drawn back. The difference between this treadle and an ordinary treadle for operating the bellows is ths: In working a treadle hung 1n the ordnary way, the curves described by the end of the treadle and by the foot are in opposite directions, and the foot must slide or move along the part of the treadle on which it bears. A roller has been applied to the treadle to ease this motion and reduce the friction, but even then an unpleasant sensation is caused to the sole of the foot. My improved mode of hanging the treadle causes the part upon which the foot rests to move in a curve in the same direction as the foot and the foot remains nearly stationary upon it, the sliding motion being entirely obviated and the necessity for the roller removed. The motions of the end of the treadle and of that part of the foot which bears upon it, are described by the dotted red line in Fig. l.
That I now claim as my invention and desire to secure by Letters Patent is l. Constructing the air receiving box of a melodeon or other keyed wind instrument of a similar nature which is operated by an exhausting bellows or pump, with a vibrating or movable top F, connected to it by wings or joints c, c, which fold or bend substantially in the manner described, toward the external air which acts upon them whereby the external air acting upon the said wings counteracts the nequality of the force exerted by the spring placed inside to open or expand and enlarge the interior capacity of the box.
The manner of hanging the treadle, L, for operating the bellows, upon the two vibrating rods, M, and N, attached to the fioor or to any object under the instrument substantially as herein set forth.
O. H. ELDRIDGE, CALVIN HILLMAN.
|Publication Number||Publication Date|
|US8792A true US8792A (en)||1852-03-09|
Family Applications (1)
|Application Number||Title||Priority Date||Filing Date|
|US8792A Expired - Lifetime US8792A (en)||Melodeon|
Country Status (1)
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