CN2388684Y

CN2388684Y - Multi-layer curved plate type piano bridge

Info

Publication number: CN2388684Y
Application number: CN 99244257
Authority: CN
Inventors: 张景贤
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-09-09
Filing date: 1999-09-09
Publication date: 2000-07-19
Anticipated expiration: 2009-09-09

Abstract

The utility model relates to a multi-layer curved surface plate type piano bridge, which comprises a plurality of strip plates which are bent into the curved surface shape of the bridge and sag toward the curved surface bridge and adhesive layers for bonding the strip plates sagging toward the curved surface bridge into an integral structure. One layer of cover plate which is vertical to the curved surfaces of the strip plates sagging toward the curved surface bridge is affixed to the upper end of the integral structure. Even numbers of wood plugs having the equal distance to the end part of the bridge are inserted into combined positions of the cover plate and the strip plates sagging toward the curved surface bridge. Thus, the utility model overcomes the defects that the multi-layer planar plate type piano bridge has the adhesive layers of easy tackless and forms a reflecting boundary surface, which influences the sound effect of the piano, etc. The utility model can transmit the vibrational energy of the piano string to a sound plate in a lossless way, and thus, the piano has favorable sound effect.

Description

The board-like piano bridge of a kind of multilayer curved surface

The utility model relates to a kind of piano bridge structure, the board-like piano bridge of particularly a kind of multilayer curved surface.

Piano bridge is pressed on the soundboard, is bearing the component that string tension force produces, string by the sign indicating number bridge with its vibration transfer to soundboard, to shake the vibration that whole soundboard produces large format, make piano send loud and clear sound equipment.

Piano manufacturing factory continues to use the traditional approach of solid wood blanking always and processes piano bridge.But in recent years, since the increase of piano turnout, the scarcity of timber resources, and the numerous and confused plane multi-plywood that is bonded to one that adopts of domestic piano producer is processed a kind of plane multi-layer plate-type piano bridge.The structure of this plane multi-layer plate-type piano bridge is: be processed into the plane sign indicating number bridge batten 1 of piano bridge curve shape and the cementing layer 2 that plane sign indicating number bridge batten 1 is bonded to one structure is formed by a plurality of, its transversal section is horizontal multi-plywood and cementing layer.Analyze the stressing conditions of piano bridge, can learn clearly that just this plane multi-layer plate-type piano bridge exists following fatal defective.

See also Fig. 1, Fig. 2 and Fig. 3, Fig. 1 is the structural representation of plane multi-layer plate-type piano bridge, and Fig. 2 is the force analysis diagram of flat nail on the sign indicating number bridge, and Fig. 3 is the stressed amplification diagram of flat nail on yard bridge.As seen from the figure, this plane multi-layer plate-type piano bridge is processed into the plane sign indicating number bridge batten 1 of piano bridge curve shape and the cementing layer 2 that plane sign indicating number bridge batten 1 is bonded to one structure is formed by a plurality of, be pressed in string 7 on yard bridge all in flat nail 6 places bending, the component f of flat nail 6 is pressed in generation, if: string 7 diameter 0.9mm, flat nail diameter 2.45mm, string tension force T is in 883 newton, press Rt Δ ABC length of side ratio and decompose string tension force T, can get:

Two flat nail places of a string produce the opposite f of both direction and form couple, and the couple value is 24mm * f=2.93 Newton meter.And on a sign indicating number bridge 180 strings are arranged usually, it is 2.93 Newton meters * 180=527 Newton meter that 180 couple in-plane displancements form compound couple value, the place of so big compound couple beyond sign indicating number bridge flat nail can produce shear stress, its shear stress can make the cementing layer between the plane sign indicating number bridge batten parallel with the soundboard face critical section occur, causes glue-line to come unglued.

In addition, the direction that the vertical string vibration of the horizontal cementing layer of this plane multi-layer plate-type piano bridge is transmitted to soundboard, vibration transfer can produce boundary reflection on its cementing layer, and the vibration of loss string influences the piano sound effect to the energy of soundboard transmitting vibrations.

The utility model purpose is, overcome easily coming unglued of the board-like piano bridge existence of above-mentioned multilayer planar at its gummed place, form reflecting interface at horizontal cementing layer, influence defectives such as piano sound effect, provide a kind of multilayer curved surface board-like piano bridge, the board-like piano bridge of this multilayer curved surface, because its xsect is the vertical curved surface of multilayer longitudinal bending wooden sign indicating number bridge batten and cementing layer, they are all perpendicular to the soundboard panel, be not present in the danger of coming unglued that the flat nail place causes because of shear stress, also because cementing layer is parallel to the string vibration to the direction that soundboard transmits, can produce boundary reflection, and influence the acoustics of piano simultaneously at cementing layer.

Embodiment of the present utility model is as follows:

The board-like piano bridge of multilayer curved surface that the utility model provides, it is characterized in that comprising a plurality of vertical curved surface wooden sign indicating number bridge battens that bend to the piano bridge curve form and with the be bonded to one cementing layer of structure of the wooden sign indicating number of vertical curved surface bridge batten, and on the upper surface of its integrative-structure the vertical wooden cover plate of curved surface of bonding one deck and wooden yard bridge batten of vertical curved surface; In order to prevent that the phenomenon of coming unglued from appearring in the wooden sign indicating number of wooden cover plate and vertical curved surface bridge plate bar junction, can embed the equidistant dowel in even number root distance Ma Qiao end in the junction of wooden cover plate and the wooden sign indicating number of vertical curved surface bridge plate bar, install dowel additional and can in anti-shearing force, quicken the vibration transfer of sound.

The board-like piano bridge of multilayer curved surface that the utility model provides has the following advantages:

The board-like piano bridge of multilayer curved surface that the utility model provides has overcome easily coming unglued at the gummed place of the board-like piano bridge existence of above-mentioned multilayer planar, form reflecting interface at cementing layer, influence defectives such as piano sound effect, the utility model is because its xsect is the vertical curved surface wooden sign indicating number bridge batten and the cementing layer of multilayer longitudinal bending, these vertical curved surfaces wooden sign indicating number bridge batten and cementing layer are perpendicular to the soundboard panel, be not present in the danger of coming unglued that the flat nail place causes because of shear stress, simultaneously also because cementing layer is parallel to the direction that the string vibration is transmitted to soundboard, can not produce boundary reflection at cementing layer, the energy that string can be vibrated almost " lossless " passes to soundboard, make the piano voice effect good, the equidistant dowel in even number root distance Ma Qiao end in that the junction of cover plate and the wooden sign indicating number of vertical curved surface bridge plate bar embeds can also can quicken the vibration transfer of sound in anti-shearing force.

Further describe the utility model below in conjunction with drawings and Examples:

Accompanying drawing 1 is the structural representation of plane multi-layer plate-type piano bridge;

Accompanying drawing 2 is the force analysis diagram at flat nail place on the sign indicating number bridge;

Accompanying drawing 3 is the stressed amplification diagram at flat nail place on the sign indicating number bridge;

Accompanying drawing 4 is the structural representation of curved surface multi-layer plate-type piano bridge of the present utility model;

Accompanying drawing 5 is the end face structure synoptic diagram at dowel;

Wherein: plane sign indicating number bridge batten 1 cementing layer 2

The wooden sign indicating number of vertical curved surface bridge batten 3 strings are pressed to the component f at flat nail place

The wooden cover plate 4 of string tension force T

Dowel 5 flat nails 6

String 7

By Fig. 4 and Fig. 5 as can be known, the board-like piano bridge of multilayer curved surface that the utility model provides, it is characterized in that: comprise the wooden sign indicating number of a plurality of vertical curved surfaces that bend to piano bridge curve form bridge batten 3 and will be with the be bonded to one cementing layer 2 of structure of the wooden sign indicating number of vertical curved surface bridge batten 3, and on the upper surface of its integrative-structure the vertical wooden cover plate 4 of curved surface of bonding one deck and wooden yard bridge batten 3 of vertical curved surface; In order to prevent that the phenomenon of coming unglued from appearring in wooden cover plate 4 and the wooden sign indicating number of vertical curved surface bridge plate bar 3 junctions, can be in the junction embedding even number root distance Ma Qiao end equidistant dowel 5 of wooden cover plate 4 with the wooden sign indicating number of vertical curved surface bridge plate bar 3.

In the present embodiment, the wooden sign indicating number of vertical curved surface bridge batten 3 is the birch lamina of 1.5mm, the whole rift grains of lamina are arranged, the number of plies of the wooden sign indicating number of vertical curved surface bridge batten 3 is 25 layers, cementing layer is No. 65 Lauxite glue-lines, contains urea-formaldehyde resin adhesives 300 grams on every square metre of the cementing layer No. 65, and wooden cover plate is the thick real plate of maple wood of 18mm, dowel quantity is 4, and diameter is 8mm.

Claims

1. board-like piano bridge of multilayer curved surface, it is characterized in that: comprise a plurality of vertical curved surface that bends to the piano bridge curve form wooden sign indicating number bridge battens and with the be bonded to one cementing layer of structure of the wooden sign indicating number of vertical curved surface bridge batten, and on the upper surface of its integrative-structure the vertical wooden cover plate of curved surface of bonding one deck and wooden yard bridge batten of vertical curved surface.

2. by the board-like piano bridge of the described multilayer curved surface of claim 1, it is characterized in that: the wooden sign indicating number of wooden cover plate and vertical curved surface bridge plate bar junction embeds the equidistant dowel in even number root distance Ma Qiao end.