CN2583764Y

CN2583764Y - Composite stall bars

Info

Publication number: CN2583764Y
Application number: CN 02222330
Authority: CN
Inventors: 张华君
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-22
Filing date: 2002-04-22
Publication date: 2003-10-29
Anticipated expiration: 2012-04-22

Abstract

The utility model relates to finger-joint composite stall bars, which belongs to the technical field of the piano sound board component. The bottom surfaces of the stall bars are curved surfaces which are matched with the inner side surface of a sound board, and both ends of the stall bars are provided with grooves. The stall bars are made of rift sawing spruce and take a tusk tenon with a narrow face to be engaged with bonded A-type finger-joint wood or take a tusk tenon with a wide face to be engaged with bonded B-type finger-joint wood. The short material are used in a long mode, so the selection scope of materials is enlarged, and the manufacture cost is reduced. The utility model is matched with a finger-joint wooden sound board, and has good acoustics quality characteristic.

Description

Composite stall bars

Technical field

The utility model relates to wooden component of musical instrument, particularly the wooden field of making of piano allow soundboard assembly middle rib.

Background technology

The piano allow is by soundboard, stall bars, and the string sign indicating number, noise reduction shelves and frame are formed.Stall bars are close to be fixed on the soundboard and the soundboard shape are fixed to a curved surface that radius is very big.During piano playing, string is knocked by hammer, the vibration of alternative sounds frequency takes place, vibrations of strings makes soundboard and stall bars produce the vibration of corresponding frequencies simultaneously by the string sign indicating number, because soundboard is a vaulted curved surface, add the consideration of soundboard making aspect and utilized soundboard material (timber) that (as the transaudient speed of fish scale dragon spruce rift grain is 5298m/s to the characteristic of sound transmission, and the transaudient speed of band is 783m/s), so whole allow is accepted from vibrations of strings, thereby obtain than the more loud and clear melodious piano voice of single string vibration.Basic demand for soundboard: the one, the speed of conduction sound fast and decay little, the 2nd, promptly from the bass to the high pitch, have uniform sympathetic response for the sound of different vibration frequencies.And stall bars are as a structural elements of soundboard, and it has the supporting string to the transaudient speed of soundboard and sympathetic response aspect (resonance effect) and presses and play the effect of band conduction vibration, and soundboard is formed along the more unified sympathetic response integral body of the transaudient speed of all directions.As requirement to soundboard, stall bars also need have good acoustic quality characteristic, it is having strict requirement equally aspect material, can not have anyly as natural defects such as rotten, variable color, cracking, knot, annual rings with material as whole, and the grain of wood is also had requirement.And existing rib power generally adopts the dragon spruce solid wood to make, and has caused the difficulty in the selection; Secondly, because its selection harshness, cost is higher; Moreover because whole solid wood makes, its weather resistance (temperature, the adaptability that humidity changes) to external world is relatively poor.

The wood finger joint technology (promptly is processed into box pin joint in ends such as thin plate, slabs, glued joint with adhesive then) be to solve the mature technology that short material length connects, this technology is international and domesticly all enter the industrialization practical stage (external as West Germany, Japan's seventies all existing national standard, the announcement in 1988 of China's corresponding national standards).The professional that piano is made is fettered by traditional concept, is repeating old manufacture craft with following the prescribed order, and the wood finger joint technology is considered as loseing, and thinking that finger wood is harmful to the acoustic quality characteristic of stall bars.

The utility model content

Task of the present utility model provides a kind of Composite stall bars, is intended to not influence under the acoustic quality characteristic prerequisite, adopts finger fabrication techniques stall bars.This task is realized by following design: a kind of Composite stall bars, comprise that the bottom surface is the curved surface suitable with the soundboard medial surface, the stall bars of two ends band groove, it is characterized in that, the stall bars that described employing quarter sawing dragon spruce is made are with wide the meshing splicing of box pin joint (Type B) finger wood or with (A type) finger wood of the meshing splicing of leptoprosopy box pin joint.

Above-mentioned stall bars are two-layer or three layers of bonding forming of quarter sawing dragon spruce plate amalgamation, and having in the above-mentioned quarter sawing dragon spruce plate partly or entirely is Type B finger wood.

More than design as seen, the stall bars bottom surface is the very big curved surface of radius, to fit with the soundboard bottom surface, makes soundboard be fixed to vaulted curved surface, is beneficial to and joins the pressure string, makes soundboard form the vibration sound field; Secondly, it makes soundboard have support structure, forms the curved surface of certain intensity, and the supporting string is pressed; Moreover stall bars help across grain to propagate vibration, improve the anisotropy of soundboard conduction vibration, string is excited in any point all can bamboo telegraph arrives the monoblock soundboard.Stall bars adopt the quarter sawing dragon spruce to make, and it can be Type B finger wood (see gummed finger wood national standard: promptly wide finger wood of meeting personally tooth is Type B), also can be A type finger wood (being the finger wood that leptoprosopy is seen tooth); Originally novel and finger solid wood soundboard (adopt the oblique tongue and groove mode of Type B finger wood to splice, audio frequency vibration all is improved along the velocity of propagation and the efficient of soundboard across grain direction) is used, and its acoustic quality characteristic has surpassed the existing soundboard that is equipped with the solid wood stall bars.(velocity of propagation of audio frequency vibration along the velocity of propagation of timber across grain well below short grain) dwindled this anisotropy in acoustic connection of material.Its two, adopt finger wood, will lack the long usefulness of material, enlarged selection range, reduced cost of manufacture; Its three, in the above-mentioned design, stall bars adopt layer 2-3 Type B finger quarter sawing dragon spruce plate cementation laminated to form, and have improved the weather resistance of stall bars.

Description of drawings

Fig. 1 is the schematic perspective view of this novel embodiment;

Fig. 2 is the schematic perspective view of this novel another embodiment;

Fig. 3 is the schematic perspective view of this novel another embodiment.

Fig. 1 illustrates, stall bars are made the finger technology that adopts short material length to connect, owing to be more or less the same on the height of stall bars section and the wide size, stall bars adopt the quarter sawing dragon spruce to make, can be the Type B finger wood (Type B finger box pin joint 1 among Fig. 1) with the meshing splicing of wide box pin joint (the wide tooth of meeting personally), also can be the A type finger wood (A type finger box pin joint 2 among Fig. 1) with the meshing splicing of leptoprosopy box pin joint (leptoprosopy is seen tooth).These novel stall bars adopt two-layer or three layers of bonding forming of quarter sawing dragon spruce plate amalgamation, and part or all of employing Type B finger wood is arranged in the above-mentioned quarter sawing dragon spruce plate.Among Fig. 2, amalgamation is bonding forms along laterally (for Fig. 2 Fig. 3, the length of stall bars is x direction, promptly horizontal, and it is wide to be y direction, promptly vertically, and its height is a z direction, promptly vertically) by two-layer Type B finger quarter sawing dragon spruce plate for stall bars.Its compound adhesive zygonema 3 is one (during three-layer composite board, glue-lines is two, and is not shown) during two-layer composite plate, the finger box pin joint 5 of its top plate with and the finger box pin joint 6 of lower plywood is general adopts trapezoidal box pin joint; Among Fig. 3, stall bars are formed along vertically amalgamation is bonding by two-layer Type B finger quarter sawing dragon spruce plate, and its compound adhesive zygonema 4 is one, the finger box pin joint 8 of its lamina rara externa and the trapezoidal box pin joint of the finger box pin joint of inner plating 7 general employings.

Claims

1, a kind of Composite stall bars, comprise that the bottom surface is the curved surface suitable with the soundboard medial surface, the stall bars of two ends band groove, it is characterized in that the stall bars that described employing quarter sawing dragon spruce is made are with the finger wood of wide the meshing splicing of box pin joint or with the finger wood of the meshing splicing of leptoprosopy box pin joint.

According to the described Composite stall bars of claim 1, it is characterized in that 2, described stall bars adopt two-layer or three layers of bonding forming of quarter sawing dragon spruce plate amalgamation, it is the finger wood of wide the meshing splicing of box pin joint that part is arranged in the above-mentioned quarter sawing dragon spruce plate.

According to the described Composite stall bars of claim 1, it is characterized in that 3, described all quarter sawing dragon spruce plates are the finger wood of wide the meshing splicing of box pin joint.

According to claim 1 or 2 or 3 described Composite stall barses, it is characterized in that 4, described stall bars are formed along the transversely split face is bonding by quarter sawing dragon spruce veneer.

According to claim 1 or 2 or 3 described Composite stall barses, it is characterized in that 5, described stall bars are formed along vertically amalgamation face is bonding by quarter sawing cloud plate.