Music – Instruments – Wind
Reexamination Certificate
1999-10-05
2001-12-04
Hsieh, Shih-Yung (Department: 2837)
Music
Instruments
Wind
C084S38000B
Reexamination Certificate
active
06326533
ABSTRACT:
BACKGROUND
The invention concerns a joining element for joining two components
It is frequently desired to uncouple two components in as much as possible in swinging fashion, so that impacts or shocks acting on one component are not, or only in as small a portion as possible, transferred to the second component. Known in particular are applications where a certain amount of mobility is desired, e.g. a tilting (rocking) movement of one component relative to the other.
By use of very soft, cushion-like elements it is actually possible to achieve a desired damping, however, in doing this, the precision of position with which the components are aligned to each other is impaired. In particular, undesired parallel displacements of the two components relative to each other frequently can not be excluded.
The object of the invention is to obtain a joining element for joining two components, which enables good impact damping, permits a tilting movement of both components and that simultaneously reliably guides both components, so that parallel displacements of the two components relative to one another are reduced or impossible.
SUMMARY
This task underlying the invention is resolved by a joining element with the features of claim
1
.
In other words, the invention proposes a joining element that consists of a central part and an outer damping member. The central part consists of a comparatively harder material in comparison to the damping member, whereby, however, this comparatively harder material of the central part displays a self-damping, consisting, e.g., not of a solid metal but rather of foam metal or, in particular, of plastic.
However, the actual damping function does not belong to the central part. It is formed in a known way more as a hard element and serves as a support that defines the distance between the two components to be joined, and that enables a tilting movement relative to each other of the two components to be joined, whereby the end with the smaller diameter can be used as the pivot for a balance and defines the tilt-point. In comparison to this, the damping member is formed as a known soft element and enables uncoupling the two components to be joined in a swinging fashion.
The central part displays a broader base as a first end for enabling attachment to a first component, and displays on the oppositely-lying other end, which is adjacent to the second of the two components to be joined, a lesser circumference, hence formed more “pointy” in comparison to the base. Aside from the properties of the material, this shaping promotes the damping action of the central part.
The central part is surrounded by a damping member that is softer compared to the central part, and displays better damping properties than the central part.
Due to the fact that the damping member grips about the central part in interlocking fashion, at least in the region of its second end, the introduction of vibrations in the second component is avoided to a very great extent. Additionally, the damping member produces a lateral guidance for the second end of the central part. Parallel displacements between the first and second component that could be provoked by bending of the central part, in particular in its region where the material is reduced at its second end, are therewith avoided, or at least considerably reduced.
Advantageously, the central part can display an undercut into which the damping member extends. In this way, an adhesive-free joining between the central part and the damping member is capable of being accomplished. That is to say, gluing possibly produces a hardening of the damping member in its edge region adjacent to the adhesive, so that, with the adhesive-free joining of central part and damping member, damping behavior of the joining element is improved.
Advantageously, the circumference of the central part can become constantly, or at least essentially constantly, ever greater from the second end toward the base. Through means of this non-prismatic shaping, the self-damping behavior is influenced in a positive manner, and transference of vibration between the two components is rendered more difficult.
The damping member surrounding the central part can advantageously consist of easily glueable material. By this means, it becomes possible to configure the second end of the central part lying oppositely to the base almost punctiform, so that there results here a swinging coupling to the second component with only minimum force.
Yet, a comparatively large surface of the damping member is capable of being provided here for good connection of the joining element with the second component, where the damping member lies against the central part in interlocking fashion, so that a large surface gluing will be enabled and, therewith, a positive joining with the component provided there. If the joining element is to be joined at this place with a metallic component, the already-mentioned possible hardening of the damping member at that location where it is to be glued to another object represents no great drawback. This possibly hardened area of the damping element is always still softer than the material of the metallic component, so that a stepwise hardness transition from the damping member over the layer of adhesive to the metallic component is achieved.
Advantageously, the central part can consist of polypropylene. It has been shown that this material displays an outstanding self-damping, at the same time an outstanding strength in order to guarantee the guidance of the two components to be joined.
In accordance with the invention, the joining element can advantageously find application as the damping member of a valve in the case of a musical instrument, especially in the case of a wind instrument for closure of a note hole. Here, usually provided is a movable support on which the valve is arranged, and that can be actuated to lift the valve from the note hole or to place it on the note hole in sealing fashion. The second, more pointed end of the central part opposite the base guarantees a tilting movement of the valve relative to the support. This tilting movement assures that impacts or shocks that act on the valve or on the support, and that foreseeably could occur during operation, can not lead to a misplacement of the valve that prevents reliable sealing of the note hole.
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Hsieh Shih-yung
Merchant & Gould P.C.
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