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Publication numberUS951550 A
Publication typeGrant
Publication dateMar 8, 1910
Filing dateApr 30, 1908
Priority dateApr 30, 1908
Publication numberUS 951550 A, US 951550A, US-A-951550, US951550 A, US951550A
InventorsElmer D St John
Original AssigneeElmer D St John
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Piano pedal-action.
US 951550 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)




Patented Mar. 8, 1910.

J22 Z/"E 222271:

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To all whom it may concern:

Be it known that I, ELMER D. ST. JOHN, a citizen of the United States, residing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Piano Pedal- Actions; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains to make and use the same.

My invention relates to pianos and has for its object the improvement of the pedal action whereby I attain simplicity of action and. construction and compactness of parts, and also the elimination of the series of intermediate parts usually employed in imparting the motion of the pedals to the dampers and other adjustable devices designed to modify, the tone as desired.

Another essential object of this invention is to provide a pedal mechanism with its connected parts whereby on account of the paucity of joints the operation will be simplified and the rattling of the joints be eliminated.

My invention consists first in combining, in connection with the different pedals, di rectly connected vertically acting bars or rods which in turn are connected to the rock rods which operate the different dampers or mufllers.

My invention further consists in forming the connecting rods with means whereby the same may be adjusted in relation to the damper rods and also in the parts and combination of parts, all of which will be hereinafter fully set forth and claimed.

In the drawings, Figure I is a view in elevation of so much of the piano action as is necessary to disclose my invention, showincr the same as looking inward from one si e of the piano. Fig. II is a detached, enlarged view showing the damper rods which operate the dampers and being divided as usual for the purpose of allowing one of the damper rods to be operated independent of the other, and also to cause both damper rods to be operated by the one action of the single pedal. Fig. III is a horizontal sectional View taken on a line above the pedals and showing the connection of a riser rod IV is a plan view of a part of the damper Specification of Letters Patent.

Application filed April 30, 1908.

Patented Mar. 8, 1910.

Serial No. 430,104.

rods, showing the manner in which the meeting ends thereof overlap.

In a pedal action, as heretofore constructed, it has been the custom to operate the damper rods, which in turn operate the dampers, from the ends of the piano. This necessitated connections from the inner ends of the pedals horizontally to the sides of the piano at the bottom thereof, and from thence vertically up the sides to the damper rods at both ends of the piano. This construction necessitated the making of the damper rods of such a length as to pro ject at both ends of the action, and also in operating the hammer rest rail the same was operated from one end of the piano. The above described construction obviously included parts intermediate the pedals and dampers and the hammer rest rail of unnecessary length, and included a multiplicity of parts which I have, in my invention entirely eliminated, while I attain a direct action, a simple construction with fewer parts, which I will proceed to set forth.

1 represents a pedal of which there may be one, two, three or more according to the construction of the piano. In the present construction, a portion of each damper rod is shown in Fig. II, with a riser rod or operating rod for each of the damper rods, and a single riser rod or operating rod for the hammer rest bar, and obviously there must be a pedal for each riser rod shown. The pedal 1 is pivotally secured to a riser 3 as at 2. At the "inner ends of the pedal I pivotally secure it to the riser rod 5 as at 4. This rod rising directly from the pedal to the rear of the action engages at its upper end an arm 6 of the rod 7, which in turn is hinged as at 8 to the action rail 9 through the arm 9 arranged at substantially right angles to said arm 6. Thus it will be seen that as the pedal is depressed the riser rod 5 is raised, raising in turn the arm 6, which causes the rod 7 to engage the pivoted damper lever 10, and release the dampers from the string 12. The reverse action of the pedal, which is caused by means of the action of the spring 13 reverses the action of all the parts and allows the damper 11 to engage the string 12. Each rod 5 is provided with a nut 14, which in this instance is shown on the upper end of the rod and which is adjusted by means of an external screw thread on the rod, and an internal screw thread in the nut 14, this nut being kept in position by means of a lock-nut 15, and it is by this means that the riser rod 5 may be lengthened or shortened as required.

In operating the hammer rest rail R, the pedal shown in dotted lines to the rear of the pedal 1, and pivotally connected to the riser rod is, is depressed, which in turn raises the riser rod 16 and with it the hammer rest rail It, throwing said hammer rail inward and shortening the stroke of the hammer H. This accomplished through the medium of an adjustable arm 17 at the upper end of the riser rod 16. Said last named pedal is pivoted to the riser 3 and is also provided with a return spring 13.

By a construction as above set forth, itwill be seen first that the movements of the pedals are directly communicated to the dampers, and to the hammer rest rail, centrally ot' the piano, and near or close to the overlapping meeting-ends of the damperrods 7, thus eliminating torsional strain on the arms 6 leading from the damper rods 7 and also eliminating a multiplicity of joints and parts. It will also be seen that the action for operating the hammer rest rail is direct from its pedal and is central oil. said hammer rest rail.

In setting forth this invention I have shown and described it as I consider it best adapted to perform its functions and have shown the same with its characteristic features and their embodiment as I consider them best adapted for the purpose, but I do not wish to be limited to these details as they may be modified and still the main objects of the invention be attained, without departing from the spirit and scope of the invention as claimed.

\Vhat I claim is In a piano pedal action, the combination with an action rail, and damper levers carried thereby, oi damper rods pivotally suspended from said action rail and having overlapped meeting-ends, an arm carried by each rod adjacent the meeting ends thereot', a pedal for each damper rod, the arms of said damper-rods being in the same planes as the pedals, and riser rods directly connected at their lower ends to the inner ends of the pedals with their upper ends engag ing said arms.

Signed at Cleveland in the county of Cuyahoga and State of Ohio, this twentieth of April 1908.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2470654 *Jul 15, 1946May 17, 1949Schultz Wallace HPiano action
US5756911 *Jun 14, 1996May 26, 1998Paterson; Timothy M.Means and method for softening the sound generated by a piano having vertical strings
Cooperative ClassificationG10C3/166