DE102008013293A1 - Damper lever e.g. lifting limb, for damper arrangement of impeller, has damper lever body formed from multilayered wood bonding material i.e. bullet proof wood, in sections with density larger or equal to specific value - Google Patents

Abstract

The damper lever (1) has a damper lever body (2) formed from a multilayered wood bonding material i.e. Panzer wood(RTM: bullet proof wood) in sections with a density larger or equal to 0.9 gram per cubic centimeter. The wood bonding material includes a synthetic resin compressed wood layer formed from longitudinal, transverse or star shaped laminated beech wood veneers, where the wood veneers are impregnated with synthetic resin in a vacuum method. The wood bonding material includes non-wood layers such as sheet metal layer, ceramic layer or a mineral layer. An independent claim is also included for a damper arrangement of an impeller, comprising multiple damper levers.

Description

Field of the invention

The The present invention relates generally to a damper assembly for wings and in particular concerns so-called Lifting or sub-components as a component for such Damper arrangement.

Background of the invention

The following is based on the 1 and 2 a damper assembly 100 of a typical prior art wing, such as that in the U.S. Patent 6,633,988 B1 described. The damper assembly 100 includes damper cushions 101 attached to a damper head 102 are mounted, which usually, as shown, above a horizontally extending string 125 is held. When the damper cushions 101 with the string 125 in contact, dampen the damper cushions 101 the vibrations of the string 125 , The damper cushions 101 usually consist of felt or other material that can absorb vibrations. The damper head 102 is usually made of wood. The damper head 102 is made of a rigid damper wire 103 held at an upper end 103a on the damper head 102 and at an opposite lower end 103b by a locking mechanism 104 For example, a cylinder or a screw on a damper block 105 is appropriate. The damper block 105 is on the lifting or lower member 107 stored so that it is relative to this around the pin 106 is pivotable. The lifting or lower link 107 is about that around the pin 108 pivotally mounted support member 109 (also called capsule) and by means of a collar screw 110 attached to other structural elements of the wing.

The 2 shows the operation of the damper assembly according to the 1 to cushioning cushion 101 from the string 125 stand out when a piano key 111 is pressed. Like in the 2 shown, becomes a downward force 120 on a front end 112 the piano key 111 exercised. As the piano key 111 on a lifting or weighing point 114 resting, the exercise of power leads 120 to an upward movement of the opposite rear end 113 the piano key 111 as by the arrow 121 indicated. The back end 113 so comes with a bottom 107b of the lifting or lower member 107 In contact (or alternatively with a damper spoon attached to the lifting or sub-member) and then rotates the whippen 107 around a pen 108 (Arrow 122 ), causing the upward movement through the damper block 105 and the damper wire 103 on the damper head 102 (Arrow 123 ) so that the damper cushions 101 from the string 125 be lifted off. This allows an undamped oscillation of the string 125 when struck by a hammer, not shown. The associated movements of other components of the wing mechanism that hit the hammer on the string 125 meet and create a sound are not shown for reasons of simplification.

An important adjustment in the regulation of the wing mechanism is the right distance 115 between the bottom 107b the lifting members 107 and the back end 113 the piano keys 111 , For this purpose, adjusting mechanisms are known from the prior art, such as in the U.S. Patent 6,632,988 B1 disclosed.

Decisive for the sound of a grand piano is, among other things, that the damper cushions rapidly and sufficiently attenuate vibrations of the strings after release of the assigned wing key. For this, the must on the damper head 102 (see. 2 ) acting vertically downward force component (ie opposite to the direction of the arrow 123 ) be large enough. This force component is essentially due to the dead weight of the components of the damper assembly 100 certainly. Traditionally, the wood components of white beech wood damper assemblies having a density in the range of about 0.49 to about 0.88 g / cm ³ are used, due in particular to the excellent workability and other advantageous properties of this hardwood material. However, the specific gravity of hardwood is not sufficient for satisfactory damping behavior. Therefore, according to the prior art, usually several lead weights are inserted into the lifting members to provide a sufficient vertically downward force component (restoring force). This will be explained below with reference to 3 be explained further.

According to the 3 are in the whipping song 107 several embedding holes 132 provided in which the cylindrical lead weights 131 are used. At the embedding holes 132 These are cylindrical through-holes with a diameter equal to the outside diameter of the lead weights 131 equivalent. The lead weights are in the embedding holes 132 used. Subsequently, a counter-pressure surface is approximated from the back and the respective lead weight 131 hammered in with a hammer. This leads to a certain deformation of the lead weights 131 how closer in that U.S. Patent 5,932,820 described. This can cause cracking in the whippen 107 and in total to a deformation or change in the mechanical properties of the whippen 107 lead, which is undesirable.

The use of lead for the setting weights 131 is no longer appropriate for environmental reasons. Moisture can oxidize lead over time, which can lead to white deposits on key bodies and jacks, which can leak into the environment and lead to increased friction between adjacent key members or lifters. Although, by varying the location of the holes 132 and / or the setting weights 131 the damping force on strings of different pitch are adjusted, but the procedure for adjusting the damping force is very expensive.

As an alternative to the use of lead, only a few materials can be considered for cost reasons and for reasons of machinability. For this purpose, that reveals U.S. Patent 6,417,440 B2 a damper assembly for wings, wherein the damper heads and / or lifting members made of a metal powder-containing plastic having a density which is greater than the density of the hardwood materials commonly used, is made. In particular, iron, tungsten and copper are disclosed as metal powders. However, the use of plastic components is in part not accepted by the more traditional buyers of wings, especially high priced wings. Furthermore, the different behavior of plastic components and traditionally manufactured wood components in mechanical interaction also leads to complications.

Lead weight bodies are conventionally used to control the impact resistance of keys on acoustic pianos or grand pianos. As an alternative to using lead, this reveals U.S. Patent 6,774,294 B2 (according to the DE 102 33 001 A1 ) the use of cylindrical grub screws of a material other than lead, preferably made of iron, as setting weights. However, screwing the setscrews in the direction of the fiber planes of the softwood material of the key body causes the individual fiber planes of the softwood material to be forced apart during screwing, which is disadvantageous due to the known tendency of such softwood materials to crack. In particular, when the action mechanics is stored at too low humidity, this cracking amplified considerably.

The U.S. Patent 6,531,651 B2 discloses a comparable approach. DE 102 48 000 A1 discloses an alternative approach to reduce the risk of breakage of the key body. In this case, an insertion hole is formed in the key body, which extends vertically through a front panel to the key body. Into the insertion hole, a weight made of a material other than lead is press-fitted and fixed in the key body.

Summary of the invention

task The present invention is a damper lever in Shape of a lifting or sub-member for a damper assembly provide for wings, which provides a sufficient Damping behavior waiving the use of from materials that can be obtained for environmental reasons are questionable. According to another aspect The present invention is further a corresponding damper assembly be provided for wings.

These Tasks are solved by a damper lever according to claim 1, by a damper assembly according to claim 19 and by a use according to claim 21. Further advantageous embodiments are the subject of the dependent claims.

Thus, the present invention is based on a damper lever, in particular a lifting or Unterglied, for a damper assembly for wings, as above, with reference to 1 to 3 described by way of example. To generate a sufficient vertically downward restoring force of the damper lever body according to the invention at least in sections, and preferably formed entirely of a multilayer wood composite material having a density of greater than or equal to 0.9 g / cm ³ . By thus allowing higher weight of the lifting or lower link compared to the use of traditional hardwoods can be provided according to the invention for a sufficient vertically downward restoring force. If additional setting weights are required in such a lifting member, can be used for this purpose according to the invention to other materials than lead, which is advantageous for environmental reasons. Because of the significantly higher weight of the lifting or lower member can be used according to the invention on lighter metal materials as material for or the setting weight (s). Another advantage is that due to the largest possible dissolution of a fibrous vessel structure in the wood composite grub screws in any side surfaces and directions of the whippen can be screwed. Overall, such an inventive lifting or lower member can be produced on an industrial scale and reproducible, so that a high precision and reliability in damper assemblies according to the invention can be ensured at significantly lower labor and manufacturing costs.

The advantage of the significantly higher dead weight of the lifting or lower member according to the invention makes itself especially with damper levers noticeable for the deep bass strings of wings, where according to the invention a single setting weight in the lifting or lower member is sufficient for a satisfactory damping. In contrast, a prior art lifting member made of, for example, beech wood must accommodate at least two set weights, which is a significant problem with the short length of prior art lifting members.

According to one preferred embodiment is in the wood composite material the organically grown, fibrous structure lifted, at least as far as possible lifted, so that the aforementioned risk of cracking is not more exists. Wood composites can be industrial be made with reproducible properties. Especially can in a wood composite material according to the invention the specific weight can be specified precisely.

Preferably, the wood composite material is a multi-layered wood composite material that may include or may be formed from a synthetic resin press layer. As is known, synthetic resin press layers can be produced with comparatively high specific densities, which according to the invention provides for an advantageously large, vertically downward restoring force. Resin molded wood is a proven material that has been used for a long time in many different technical fields and that can be produced with a comparatively high density. In particular, densities of up to 1.4 g / cm ^{3 can be} achieved in this way.

According to one Another embodiment is the synthetic resin press layer from longitudinal, cross, star-shaped or the like layered veneers formed, in particular hardwood veneers, for example Buchholz veneers. These can be impregnated with synthetic resin be, for example in a vacuum process, and with curable Synthetic resins are glued under pressure and heat. In this way can wood composite materials with a comparatively high produce specific weight, which will continue in essence have the properties of wood. This is especially high specific densities using hardwood veneers, such as beech, maple, oak or the like, achieve the formation of the wood or composite material.

According to a further preferred embodiment of so-called tank timber of Delignit ^{® ®} is used as a wood composite material. Such wood composite materials are characterized by a comparatively high specific weight and by a high hardness and durability.

Of course In principle, the wood composite material can also be layers made of other materials, such as thin ones Metal sheets, ceramic layers, mineral layers or the like, which sets an even higher specific weight can be and the mechanical properties of the wood composite material can be varied further.

Prefers According to the invention, the entire damper lever body formed from your aforementioned wood composite material. Prefers is in the damper lever body according to the invention only a weight body inserted or inserted to the weight to adjust the body appropriately. This is special Advantage, as is known for lifting elements due to the small length only comparatively little space for more than one setting weight is present. Preference is given the single adjustment weight near an end opposite to Drehlagerungspunkt the lifting member provided. in principle can in a lifting member according to the invention However, several weights are used.

According to one alternative embodiment, the weight of the whippen due to the inventive use of Also be so great that instead of a wood composite material Adjustment weight at least one recess for adjusting the weight the whipper is required. This approach is particularly advantageous under production engineering aspects.

According to one Another embodiment is the weight body a cylindrical metal or carbide pin that is lead-free and is inserted into the wood composite material or this passes through. Such a weight body is particularly advantageous in the Glued wood composite material. In principle, however on the outer circumference of the weight body also an external thread be provided so that screwed such a threaded pin in the wood composite material can be. Basically, you can connect to the threaded pin with the wood composite material but also any other form, frictional, force or cohesive joining techniques be used.

by virtue of the most extensive dissolution of the fibrous structure in the wood composite material, such a threaded pin in any Direction be screwed into the wood composite material. Especially expedient, the weight body is doing of an underside of the whippen inserted into this, for example glued or screwed. Thus, a disturbing mechanical interaction between adjacent haulers excluded become.

All is particularly preferred as the material for the aforementioned Weight body carbide used. Drawing hard metals known to have a high specific gravity out. The hard metal is preferably a sintered carbide hard metal.

there The cemented carbide preferably consists of 90 to 94 percent by weight tungsten carbide (Reinforcing fiber) and 6 to 10% by weight of other materials, especially cobalt.

Prefers is the carbide thereby produced by sintering, so a process, in which high-melting hard materials in the finely divided state with a slightly melting second substance (additional body) mixes and temperatures below the melting point of the heavy fusible portion (carbide) heated, the temperature and Duration of heating can be chosen so that the carbides cake to the carbide.

One Another aspect of the present invention relates to a Damper arrangement for wings with a Plurality of damper levers, namely so-called Lifting or sub-members, as stated above.

According to one Another embodiment is in the lifting members in each case only a single adjustment weight in the wood composite material used, preferably glued or screwed. By varying the location of the individual adjustment weight with respect to the pivot point of the whippen can thus effectively acting vertically downward Restoring force can be varied and to be damped Page to be matched. As is known, for damping high sides lower forces required than for damping the deep bass sides of a grand piano.

Another aspect of the present invention relates to the use of a wood composite material, as set forth above, for the manufacture of lift members for damper arrangements of vanes. As regards the properties and production processes of the wood composite material in the sense of the present application, reference is made by way of example to the following publications, the content of which is hereby expressly incorporated by reference for disclosure purposes in the present application: DE 195 09 899 C2 ; DE 37 14 777 A1 ; DE 34 32 135 A1 ; German utility model 86 24 467.1 ; EP 0 826 134 B1 ,

LIST OF FIGURES

following the invention will be described by way of example and with reference are described on the accompanying drawings, from which provide further features, advantages and tasks to be solved become. Show it:

1 a detail of a damper assembly for wings according to the prior art;

2 a larger section of the damper assembly according to the 1 ;

3 in a perspective exploded view of a lifting member in the damper assembly according to the 1 and 2 ; and

4 in a perspective exploded view of a lifting member according to the present invention for a damper assembly for wings, in particular of the type according to the 1 and 2 ,

In the figures denote identical reference numerals identical or essentially equivalent elements or groups of elements.

Detailed description of preferred embodiments

The 4 shows in a perspective view a lifting member for a damper assembly for wings, for example of the type according to the 1 and 2 , The whip 1 is a total cuboid and includes the lifting or lower member body 2 in the installed state around the hole 4 at the narrowed end 3 is mounted pivotably. The damper pad, not shown, is around the bore 6 in the both sides provided, circular recess 5 pivotally mounted. According to further embodiments, the circular recess needs 5 However, also not be provided, for example, damper assemblies of the type according to the 2 ,

According to the invention, the whippen body 2 at least in sections and preferably completely made of a wood composite material, for example a synthetic resin press wood. For the production of synthetic resin press veneers impregnated with synthetic resin, preferably beechwood veneers, are highly compressed under pressure and high temperatures. The resulting material has excellent physical properties, such as high compressive strength, temperature resistance. high wear resistance, very good dimensional stability. Resin pressed wood is easy to work in the elastic and plastic area and also very durable. It combines metal-like strength with the advantage of low material costs. In addition, it is corrosion-resistant, temperature-resistant up to approx. 110 ° C, water-resistant, chemical-resistant, antistatic and easy to dispose of. Resin pressed wood is out produced naturally growing raw materials, which may be an advantageous selling point. Lanyards made in this way look almost like luffing jacks made of the traditionally used hardwood materials, which may be another advantageous selling point for traditionally-minded shoppers.

A preferably used wood composite material is available as so-called tank timber ^® from Delignit ^® commercially. Such wood composites are available with densities in the range, for example, 0.9 to 1.4 g / cm ³ .

To increase the weight of the whippen is according to the 4 a single cylindrical weight body 8th into a hole 7 of the whippen body 2 used. Preference is given to a position as far away from the pivot point 4 of the whippen body 2 used. Due to the inventive use of the aforementioned wood composite material according to the invention a single adjustment weight to achieve a suitable restoring force is sufficient.

Basically, it is preferable to use the weight body 8th into the whip body 2 glued. For manufacturing reasons, while a cylindrical profile of the weight body 8th preferred, although in principle any other profiles are conceivable, for example, square or rectangular profile. It has been found that conventional adhesives with wood composite materials, in particular synthetic resin press woods, make suitable connections. Due to the far-reaching dissolution of the natural wood fiber, the weight body can 8th but also in the form of a threaded pin at any point and in any direction in the whippen body 2 be screwed.

Preferably, it is the weight body 8th around a hard metal body, preferably from a sintered carbide hard metal. Such hard metals in the context of the present application consist mostly of 90 to 94 weight percent tungsten carbide and other admixtures, in particular cobalt.

As the expert in studying the above description readily Of course, it can be seen on the damper block Also, a sostenutonase may be provided and may be the rear end the key body also with an opposite Damper spoon on damper lever body interact.

1

lifting or sub-member

2

lifting or lower member body

3

Verschmälertes The End

4

Bore / pivot point

5

recess

6

Bore / pivot point (for damper block)

7

Embedding hole / -bore

8th

adjustment weight

9

Pilote

10

(Cutting) threaded

100

damper arrangement

101

damper cushions

102

muffler head

103

damper wire

103a

First end of the damper wire 103

103b

Second end of the damper wire 103

104

locking element

105

damper Klotz

106

pen

107

lifting or sub-member

107b

Bottom of the lifting or lower link 107

108

pen

109

support member (Capsule)

110

Bundschraube

111

button

112

Front end of the button 111

113

Rear end of the button 111

114

Hebeldreh- or balance point

115

gap

120

down directed force

121

upward movement

122

up directed rotational movement

123

upward movement

125

string

130

lifting or lower member body

131

lead weight

132

embedding hole

133

Pilote

134

(Cutting) threaded

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - US 6633988 B1 [0002]
• - US 6632988 B1 [0004]
• US 5932820 [0006]
• - US 6417440 B2 [0008]
• - US 6774294 B2 [0009]
• - DE 10233001 A1 [0009]
• US 6531651 B2 [0010]
• - DE 10248000 A1 [0010]
• - DE 19509899 C2 [0029]
• DE 3714777 A1 [0029]
• - DE 3432135 A1 [0029]
• - DE 8624467 U [0029]
• - EP 0826134 B1 [0029]

Claims (27)

Damper lever for a damper assembly ( 100 ) for wings, with a damper lever body ( 2 ), characterized in that the damper lever body ( 2 ) is at least partially formed of a multilayer wood composite material having a density of greater than or equal to 0.9 g / cm ³ . A damper lever according to claim 1, wherein the wood composite material a synthetic resin press layer comprises or is formed therefrom. A damper lever according to claim 2, wherein the synthetic resin press layer from longitudinal, cross, star-shaped or the like layered wood veneers is formed. Damper lever according to claim 3, wherein the wood veneers Hardwood veneers, especially beech wood veneers are. Damper lever according to claim 3 or 4, wherein the Wood veneers impregnated with synthetic resin in a vacuum process and with curable synthetic resins under pressure and heat are glued. Damper lever according to one of the preceding claims, wherein the wood composite material is a Panzerholz ^® . Damper lever according to one of the preceding Claims, wherein the wood composite material at least one additional layer comprising non-wood materials and in particular from a metal sheet, a ceramic layer or a mineral layer. Damper lever according to one of the preceding claims, wherein the damper lever body ( 2 ) is formed entirely of the wood composite material. Damper lever according to one of the preceding claims, wherein in the damper lever body ( 2 ) at least one weight body ( 9 ) is inserted and / or formed in this at least one recess to the weight of the damper lever body ( 2 ). Damper lever according to claim 9, wherein the weight body is a cylindrical metal or hard metal pin ( 8th ), which is lead-free and is inserted in the wood composite material or passes through this. Damper lever according to claim 9 or 10, wherein the weight body ( 8th ) is glued into the wood composite material. Damper lever according to claim 9 or 10, wherein the weight body ( 8th ) is a threaded pin which is screwed into the wood composite material. Damper lever according to one of claims 9 to 12, wherein the weight body ( 8th ) engages vertically in a side surface of the damper lever body. Damper lever according to claim 13, wherein the weight body ( 8th ) extends parallel to a layer direction of the wood composite material. Damper lever according to one of claims 9 to 14, wherein the weight body ( 8th ) vertically in an underside of the damper lever body ( 2 ) is used. Damper lever according to one of the claims 10 to 15, when appended to claim 10, wherein the Tungsten carbide is a sintered carbide hard metal. Damper lever according to claim 16, wherein the hard metal Comprises 90-94 weight percent tungsten carbide and cobalt. Damper lever according to one of the preceding claims, wherein in the wood composite material a single weight body ( 8th ) near a fulcrum ( 4 ) of the damper lever body ( 2 ) opposite end of the damper lever body ( 2 ) is used. Damper assembly ( 100 ) for wings, comprising a plurality of damper levers ( 1 ) according to one of the preceding claims, each having a at a first end of the damper lever body ( 2 ) pivotally articulated mounting member are fastened to a frame of the wing, wherein each near a first end opposite the first end of the damper lever body a lever pivotally mounted on the respective damper lever body ( 2 ), which is connected via a damper wire with a respective damper head of the wing, to move it up and down in response to a key press. Damper assembly according to claim 19, wherein the weight of the at least one weight body ( 8th ) of damper levers ( 1 ), which are associated with lower sides of the wing, is heavier than the weight of the at least one weight body ( 8th ) of damper levers ( 1 ), the damper levers ( 1 ), which are assigned to higher sides of the wing, so that vibrations of the sides can be uniformly damped. Use of a multilayer wood composite material having a density of greater than or equal to 0.9 g / cm ³ as a starting material for the production of lifting or sub-members ( 1 ) for a Dämp ferra arrangement ( 100 ) for wings. Use according to claim 21, wherein the wood composite material a synthetic resin press layer comprises or is formed therefrom. Use according to claim 22, wherein the synthetic resin press layer from longitudinal, cross, star-shaped or the like layered wood veneers is formed. Use according to claim 23, wherein the wood veneers Hardwood veneers, especially beech wood veneers are. Use according to claim 23 or 24, wherein the wood veneers in a vacuum process impregnated with synthetic resin and with curable synthetic resins under pressure and heat are glued. Use according to one of claims 21 to 25, wherein the wood composite material ^® is a tank timber. Use according to one of claims 21 to 26, wherein the wood composite material at least one additional Layer comprising non-wood materials and in particular from a metal sheet, a ceramic layer or a mineral Layer exists.