DE7311598U - PIANO DAMPER MECHANISM - Google Patents

Description

Piano damper mechanism

The invention relates to a piano damper mechanism with a self-aligning damper head for each
String of an upright piano is provided to

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hear vibrations after your finger pressure on the to prevent associated button.

In the mechanics of the modern upright piano, each damper mechanism usually comprises a damper lock adjustably mounted on a rod extending from a pivoted arm, and a with
a felt covering provided damper wood, called damper head, which is essentially made of one piece with the damper block
consisting is connected to it so that it can be moved into and out of contact with the piano string in accordance with the movement of the corresponding key. So far, the surfaces of the damper block and the damper wood, which are to be connected to one another, have been designed to be completely flat, so that precise alignment of these parts before they are joined together has been extremely difficult.

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It is also necessary that the damper head thus combined with the damper block in precise alignment is brought to the string. If the damper head is at an angle to the string, the rod must open to which the damper block is attached, can be bent in a suitable manner in order to bring the damper head into position. If it also turned out that the damper copy laterally is displaced from its correct position on the string or is otherwise in an incorrect position is located, a screw that fastened the damper block to the rod had to be loosened in order to restore the damper head exactly position parallel to the string. It was necessary to position the damper head in relation to the string so up to now a highly qualified and time-consuming manual work.

In view of the difficulties and deficiencies of the prior art mentioned, it is an object of the invention to Improvements to the damper mechanism provide for each string of a piano, through the use of a damper head and a damper block can be made self-aligning.

Another object of the invention is to provide an improved damper mechanism by which the damper head can easily be knocked with the damper block in the correct position to the corresponding piano string, whereby there is no need for any subsequent adjustment of its position.

For these and other purposes which will become apparent hereinafter, the invention relates to a piano damper of the type mentioned Kind of improvement, which has a convex, on the damper

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block formed surface, a concave, on the damper hole formed surface to accommodate the convex flax aes Dü:;. pferblocks with such play that an adjustment of the position of the damper head against the corresponding string of the piano, and comprises means such as a Adhesive, for the permanent connection of the damper head with the Damper block are used after adjusting the position of the damper head. The convex and concave surfaces can also be interchanged be attached to the damper block and damper wood.

The features which are believed to be new and which characterize the invention are specified in detail in the claims. The invention itself, however, as regards its arrangement and operation as well as its further objects and advantages, will best be understood from the following description of a preferred embodiment ^; . Understandable in conjunction with the drawing, in which the same reference characters indicate gloichs parts in different views "Show in them. ·:

Fig. 1 is a side view of a typical damper mechanism: r.us of an upright piano in which the invention is applicable;

FIG. 2 shows a side view, partially in section, of a damper block and a damper head according to FIG. 1, which are connected to one another in the novel, inventive manner are;

Fig. 3 is a view similar to that shown in Fig. 2 showing another preferred embodiment of the invention illustrates;

• .Fig. 4 and 5 are views achieved by the invention

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Explain advantages.

Reference is first made to Fig. 1 to the construction
and to explain operation of a typical upright piano damper mechanism to which the invention relates, wherein a damper arm is hinged at 11 to the two-pronged end of a fork 12. The other end of the fork 12 is
attached to the piano main rail not shown to support the damper arm 10 pivotally. A spring 13 is
with one end attached to the fork 12, while the other end of the spring is held against the upper end 10a of the damper arm 10 via a pad 14, so that the damper arm 10 is thereby forced to rotate counterclockwise on the pin 11, as can be seen from FIG.

A rod 15 extends from the upper end 10a of the damper

and through a bore provided in the damper block 16
is plugged. The position of this damper block on the rod 15 is variable in its longitudinal direction, and the block can
by a screw 17 in. each in relation to a damper head
18 desired position, which prevents the vibrations of the corresponding string 19 of the piano in the required manner,
be rigidly attached to the rod 15. The damper head 18 comprises a damper wood 20 and a pair of damper felts 22,. with
the end face of the damper wood 20 verbun via their references 21 are the.

In the preceding two paragraphs, the damper mechanism of known type has been described to which the invention relates
relates. This according to is on the back of the damper wood
20, as shown in Fig. 2, formed in the center a concave surface 20a, while a substantially corresponding

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convex surface I6a at the front end of the damper block 16 is trained. As can be seen from Fig. 2, the convex surface i6a and the concave surface 20a are in relation to each other so dimensioned that the former is taken up with considerable play in the latter. In this way the damper head can be 18 in exact alignment with page 19, as below further explained in detail, connect to the damper block 16.

The position of the damper 18 relative to the string 19 can be adjust while the convex surface I6a at the front of the damper block 16 is received in the concave surface 20a on the rear side of the damper wood 20. The surfaces of action the damper felts 22 must then be in tight contact with the string 19 and exactly parallel to the plane of all of them under tension Klaviersa. th are brought into position. When the damper head 18 is so adjusted in a precisely aligned position to the string 19, a suitable adhesive is in the concave surface 20a of the damper wood 20, which securely holds the convex surface i6a of the damper block 16 therein.

Although the damper head 18 to adjust its position opposite the string 19 may even have been moved considerably relative to the damper block 16 prior to the application of the adhesive like, so the damper block 16 and the damper wood 20 are thanks the somewhat loosely fitting convex surface 16a and concave surface 20a held at least aligned with one another. The various inconveniences that have arisen with the Aligning every damper head in a piano is thus completely eliminated.

In another preferred embodiment of the invention, the As illustrated in Fig. 3, the damper wood 20 is provided with a convex surface 20b in the middle of its back surface,

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while the damper block 16 has a on its front tip has concave surface I6b, which is used to accommodate the convex Surface 20b is used with such play that the position of the damper head 18 is adjustable with respect to the string, before the damper wood and the damper block by means of a matching one Convex and concave surfaces 20b and 16b attached adhesive are rigidly connected to each other. more details the construction and operation of this second embodiment of the invention are specific above by reference explained on Fig. 2.

According to the invention described above with particular reference to FIGS. 2 and 3, the damper block 16 can be adjusted on the rod 15 holding screw are dispensed with, since an adjustment of the damper head with respect to the string the fixed connection of the damper wood 20 with the damper block 16 by using the adhesive 23 is no longer essential is required. Accordingly, as illustrated in FIGS. 4 and 5, for example, the damper block may be made of a synthetic resin be formed substantially in one piece with the rod 15 according to the known insert molding technique. To this In this way, the assembly of the piano's damper mechanism can be further facilitated.

Patent claims:

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Claims (4)

Il I 1 I I «I lit ·« It ·· * »! F- B ^ n proverbs 1. A damper mechanism for pianos with a damper block mounted on a pivotable rod and a damper head for the suppression of the vibrations of the strings of a piano by its movement in and out of contact with the same by the pivotable rod, which comprises a damper wood which can be connected to the damper block, characterized in that, that a convex surface (i6si) is formed on the damper block (16), while on the damper wood (20) one to accommodate the convex surface (i6a) with such play that the position of the damper head (18) relative to the string (19) is adjustable is, certain concave surface (20a) is formed, the convex surface (i6a) and the concave surface (20a) are capable of making the damper block (16) and damper head (18) self-aligning, and that means are provided (23) after adjustment of the damper head relative to the string (19), the damper wood (20) rigidly attached to the damper head (16) via the additionally amm enpassenden convex (18) and fasten concave surfaces. 2. Damper mechanism according to claim 1, characterized in that the means (23) from an adhesive attached to the interlocking convex and concave surfaces (i6a, 20a). 3. Damper mechanism for pianos with one on one swivel Rod-mounted damper block and a damper head for preventing the vibrations of the strings of a Piano by its movement in and out of contact with the same by the pivoting rod, the one with the damper block includes connectable damper wood, thereby 7311598 08/26/76 characterized in that a concave surface (16b) is formed on the damper block (16) while on the damper wood (20) one for receiving in the concave surface (i6b) with such play that the position of the damper head (18) is adjustable with respect to the string (19), certain convex Surface (20b) formed, whereby the concave surface (16b) and the convex surface (20b) are capable of the damper block (16) and the damper head (18) to make themselves aligned, and that means (23) are provided that after adjusting the damper head (18) in relation to the string (19) rigidly attach the damper wood (20) to the damper head (16) via the mating convex and concave surfaces. 4. Damper mechanism according to claim 3, characterized in that the means (23) from an adhesive attached to the interlocking convex and concave surfaces (20b, 16b). Wb / Pe - 25 281 7311598 08/26/76