CA1295858C - Resonator tuning adjustment for keyboard percussion instruments - Google Patents
Resonator tuning adjustment for keyboard percussion instrumentsInfo
- Publication number
- CA1295858C CA1295858C CA000581204A CA581204A CA1295858C CA 1295858 C CA1295858 C CA 1295858C CA 000581204 A CA000581204 A CA 000581204A CA 581204 A CA581204 A CA 581204A CA 1295858 C CA1295858 C CA 1295858C
- Authority
- CA
- Canada
- Prior art keywords
- cap
- resonator tube
- resonator
- threads
- tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Classifications
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10D—STRINGED MUSICAL INSTRUMENTS; WIND MUSICAL INSTRUMENTS; ACCORDIONS OR CONCERTINAS; PERCUSSION MUSICAL INSTRUMENTS; AEOLIAN HARPS; SINGING-FLAME MUSICAL INSTRUMENTS; MUSICAL INSTRUMENTS NOT OTHERWISE PROVIDED FOR
- G10D13/00—Percussion musical instruments; Details or accessories therefor
- G10D13/01—General design of percussion musical instruments
- G10D13/08—Multi-toned musical instruments with sonorous bars, blocks, forks, gongs, plates, rods or teeth
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Electrophonic Musical Instruments (AREA)
Abstract
PHA 40521 30.5.1988 ABSTRACT:
Resonator tuning adjustment for keyboard percussion instruments.
A tuning means for the resonators of keyboard percussion instruments, particularly the lower note resonators of marimbas. A threaded cap and collar provide pitch adjustment while a holding means maintains the adjustment so that vibration buzzing of the adjusting parts is prevented.
Resonator tuning adjustment for keyboard percussion instruments.
A tuning means for the resonators of keyboard percussion instruments, particularly the lower note resonators of marimbas. A threaded cap and collar provide pitch adjustment while a holding means maintains the adjustment so that vibration buzzing of the adjusting parts is prevented.
Description
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PHA L~0521 3O-5O1988 Resonator tuning adjustment for keyboard percussion instruments, Background of the invention.
Field of the Inv_ntion, The invention relates generally to keyboard percussion instruments, such as marimbas and vibraphones, which have resonators associated with tuned bars.
Description of the Prior Art.
In order to achieve the optimal relationship between each tuned bar and reeonator~ it is desirable to ha~e the resonator respond sympathetically~ or be tuned to~ a certa~n pltc~ with resp~ct to its assoc~ated tuned bar.
When a resonator is tuned ver~ closel~ to the pitch of its associated tuned bar, the resulting tone (when the bar is struck) is loud, but relatively short in duration. With a slight amount of de-tuning of the resonator, the resulting tone is not so loud, but persists longer. The degree of de-tuning and whether the de-tuning is above or below the pitch of the tunedbar has a significant effect on the quality of the resultan-t tone.
Different musical selections call for different tonal responses. Therefore, it is desirable for the per-forming artist to be able to select or adjust the response of his instrument to achieve the tonal response he wants the musical selection to be perforlned.
Prior art keyboard percussion instruments have provided for pitch adjustment of resonators, but the adjusting means has required the simultaneous use of two hands or has been otherwise inconvenient. While adjustable resonators have provided an advance over non-adjustable resonators, they have been unsatisfactory in that the performing artist has not been able to simuItaneousl~ tap the associated tuned bar of a resonator to be adjusted ~295~
PHA L~0521 3O-5O1988 Resonator tuning adjustment for keyboard percussion instruments, Background of the invention.
Field of the Inv_ntion, The invention relates generally to keyboard percussion instruments, such as marimbas and vibraphones, which have resonators associated with tuned bars.
Description of the Prior Art.
In order to achieve the optimal relationship between each tuned bar and reeonator~ it is desirable to ha~e the resonator respond sympathetically~ or be tuned to~ a certa~n pltc~ with resp~ct to its assoc~ated tuned bar.
When a resonator is tuned ver~ closel~ to the pitch of its associated tuned bar, the resulting tone (when the bar is struck) is loud, but relatively short in duration. With a slight amount of de-tuning of the resonator, the resulting tone is not so loud, but persists longer. The degree of de-tuning and whether the de-tuning is above or below the pitch of the tunedbar has a significant effect on the quality of the resultan-t tone.
Different musical selections call for different tonal responses. Therefore, it is desirable for the per-forming artist to be able to select or adjust the response of his instrument to achieve the tonal response he wants the musical selection to be perforlned.
Prior art keyboard percussion instruments have provided for pitch adjustment of resonators, but the adjusting means has required the simultaneous use of two hands or has been otherwise inconvenient. While adjustable resonators have provided an advance over non-adjustable resonators, they have been unsatisfactory in that the performing artist has not been able to simuItaneousl~ tap the associated tuned bar of a resonator to be adjusted ~295~
while at the same time adjusting that resonator. In other words, it has been necessary for the artist to make a small adjustment, strike the tunedbar to produce a tone, listen, make another adjustment, s~rike the bar again, etc. The present invention overcomes that problem.
Summary of the Invention The present invention provides, according to one aspect, tuning adjustment means for a resonator tube of a keyboard percussion instrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten the air colum thereof and rotation of said cap in the opposite direction moves said cap outwardly of said resonator tube to lengthen the air column there-of, sealing means for providing a pneumatic seal between the mating threaded portions of said resonator tube and said cap, and h~lding means for holding said cap in rotational position with respect to said resonator tube, said sealing means comprising mat-ing threads on said cap and said resonator tube and a viscous material interposed therebetween.
According to another aspect, the invention provides tuning adjustment means for a xesonator tube of a keyboard percussion instrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator t~ube to shorten the air column thereof and `` ~L2~3S~3~il5 - 2a - 28282-1 rotation of said cap in the opposite direction moves said cap outwardly of said resonator tube to lengthen the air column thereof, sealing means for providing a pneumatic seal between th~
mating threaded portions of said resonator tube and said cap, and holding means for holding said cap in rotational position with respect ~o said resonator tube, said sealing means and said hold-ing means comprising tight-fitting, smooth running matiny threads on said cap and said resonator tube and a viscous material inter-posed therebetween.
According to yet another aspect, the invention pro-vides tuning adjustment means for a resonator tube O.e a keyboard percussion inskrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten the air column thereof and rotatlon of said cap in the opposite directlon moves said cap ; outwardly of said resonator tube to lengthen the air column there-oE, sealing means for providing a pneumatic seal between the mating threaded portions of said resonator tube and said cap, and holding means for holding said cap in rotational position with respect to said resonator tube, wherein said holding means com-prises spring means operative between said resonator tube and .
said cap for providing a frictional holding force for opposing rotation of sald cap~with;respect to said resonator tube.
Brief description of the drawing.
~` Figure l is a rear view of a marimba without its ~ ~ '' `' , .
; :
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- 2b - 28282-1 tuned bars.
Figure 2 is a top view of a marimba without its tuned bars.
Figure 3 is a schematic representation of a tuned bar and an associated resonator showing the resonator tuning means of the present invention.
Figure 4 is an enlarged cross-sectional view of the lower end of the resonator of Figure 3 showing in detail the tuning means thereof and one embodiment of the holding means.
Figure 5 is an enlarged view of the lower end of the resonator of Figure 3 showing the tuning means thereof and an alternate embodlment of the holdtng means.
Figure 6 is a side view of the holding element for the holding means illustrated in Figure 5.
Detailed description of the preferred embodiments.
Referring now to Figure 1, there is shown a some-what schematic rear elevation view of a marimba 10 without its tuned bars. As is well known to persons skilled in :
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PHA 40521 3 30,5,1988 the art, the tuned bars are supported by bar supports 11 and are struck with a mallet to produce musical tones of different pitch. Suspended beneath each tuned bar is a resonator tube that provides an air column approximately resonant to the pitch of its associated tuned bar.
The tuned bars of a marimba are customarily arranged in piano keyboard fashion so that we may, by analogy, refer to the l'white key" bars and the "black key"
bars. The associated resonators may be referred to by use of the same analogy. Therefore, we can say that the "white key" resonator assembly is illustrated at 12 in Fig. 1.
Referring now to Fig. 2 there is shown a top view of the marimba of Fig~ 1, again without tuned bars, so that the "white keyl' resonator assembly 12 and 'Iblack key" resonator assembly 13 may be clearly seen. ~xcept f`or ~ariatlons in diameter and length as requirod to produce the resonant air column for the associated tuned bar, all of the resonatDrS are substantially structurally identical, It is known, however, that variations in humidity~ temperature, etc. have more effect on -the ~onger, larger diameter resonators for the lower pitched tuned~bars than upon the shorter, smaller diameter resona-tors for the higher pitched tuned bars. Therefore, while some improvement or adjustment of response would be achieved by pro~iding resonator tuning adJustment means for the higher pitched tones, the most dramatic and valuable results are achieved in the lower pitched tones, particularly the lower pitch~d tones of professional ~; instruments which have a range as great as 4-1/2 octaves.
Summary of the Invention The present invention provides, according to one aspect, tuning adjustment means for a resonator tube of a keyboard percussion instrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten the air colum thereof and rotation of said cap in the opposite direction moves said cap outwardly of said resonator tube to lengthen the air column there-of, sealing means for providing a pneumatic seal between the mating threaded portions of said resonator tube and said cap, and h~lding means for holding said cap in rotational position with respect to said resonator tube, said sealing means comprising mat-ing threads on said cap and said resonator tube and a viscous material interposed therebetween.
According to another aspect, the invention provides tuning adjustment means for a xesonator tube of a keyboard percussion instrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator t~ube to shorten the air column thereof and `` ~L2~3S~3~il5 - 2a - 28282-1 rotation of said cap in the opposite direction moves said cap outwardly of said resonator tube to lengthen the air column thereof, sealing means for providing a pneumatic seal between th~
mating threaded portions of said resonator tube and said cap, and holding means for holding said cap in rotational position with respect ~o said resonator tube, said sealing means and said hold-ing means comprising tight-fitting, smooth running matiny threads on said cap and said resonator tube and a viscous material inter-posed therebetween.
According to yet another aspect, the invention pro-vides tuning adjustment means for a resonator tube O.e a keyboard percussion inskrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten the air column thereof and rotatlon of said cap in the opposite directlon moves said cap ; outwardly of said resonator tube to lengthen the air column there-oE, sealing means for providing a pneumatic seal between the mating threaded portions of said resonator tube and said cap, and holding means for holding said cap in rotational position with respect to said resonator tube, wherein said holding means com-prises spring means operative between said resonator tube and .
said cap for providing a frictional holding force for opposing rotation of sald cap~with;respect to said resonator tube.
Brief description of the drawing.
~` Figure l is a rear view of a marimba without its ~ ~ '' `' , .
; :
..~
- 2b - 28282-1 tuned bars.
Figure 2 is a top view of a marimba without its tuned bars.
Figure 3 is a schematic representation of a tuned bar and an associated resonator showing the resonator tuning means of the present invention.
Figure 4 is an enlarged cross-sectional view of the lower end of the resonator of Figure 3 showing in detail the tuning means thereof and one embodiment of the holding means.
Figure 5 is an enlarged view of the lower end of the resonator of Figure 3 showing the tuning means thereof and an alternate embodlment of the holdtng means.
Figure 6 is a side view of the holding element for the holding means illustrated in Figure 5.
Detailed description of the preferred embodiments.
Referring now to Figure 1, there is shown a some-what schematic rear elevation view of a marimba 10 without its tuned bars. As is well known to persons skilled in :
, . ~ , ~:
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,. ~
PHA 40521 3 30,5,1988 the art, the tuned bars are supported by bar supports 11 and are struck with a mallet to produce musical tones of different pitch. Suspended beneath each tuned bar is a resonator tube that provides an air column approximately resonant to the pitch of its associated tuned bar.
The tuned bars of a marimba are customarily arranged in piano keyboard fashion so that we may, by analogy, refer to the l'white key" bars and the "black key"
bars. The associated resonators may be referred to by use of the same analogy. Therefore, we can say that the "white key" resonator assembly is illustrated at 12 in Fig. 1.
Referring now to Fig. 2 there is shown a top view of the marimba of Fig~ 1, again without tuned bars, so that the "white keyl' resonator assembly 12 and 'Iblack key" resonator assembly 13 may be clearly seen. ~xcept f`or ~ariatlons in diameter and length as requirod to produce the resonant air column for the associated tuned bar, all of the resonatDrS are substantially structurally identical, It is known, however, that variations in humidity~ temperature, etc. have more effect on -the ~onger, larger diameter resonators for the lower pitched tuned~bars than upon the shorter, smaller diameter resona-tors for the higher pitched tuned bars. Therefore, while some improvement or adjustment of response would be achieved by pro~iding resonator tuning adJustment means for the higher pitched tones, the most dramatic and valuable results are achieved in the lower pitched tones, particularly the lower pitch~d tones of professional ~; instruments which have a range as great as 4-1/2 octaves.
3~ Only one resonator need be shown to illustrate the present invention, for example resonator 12' as shown in ~ig. 2. Fig. 3 shows an enlarged diagrammatic repre-senation of resonator 12' positioned beneath a tuned bar 14. The lower portion of resonator 12' is shown in cross-section wh~re there can be seen the resonator tube 15, a threaded sleeve~16 and a threaded cap 17~ In operation, ~ the sIeeve 16 is mounted in the lower end of tube 15 by : ~ :
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, P~ 40521 L~ 30.5.1988 means of an interference or press fit. Sleeve 16 may be considered to be a part of resonator tube 15, and may be integrally formed therewith or may be affixed by other means, e.g. adhesive bonding. Sleeve 16 is provided with internal or female threads to receive the external or male threads of cap 17. Cap 17 may have a tubular portion 18, a ring or flange portion 19 and a disc portion 20. While the prototypes for this ass~ bly have been fabricated as illustrated in Fig. 4, with the disc portion 20 being fillet welded to the tubular oportion 18 and the ring or flange portion affixed by means of an interference or press fit, it is contemplated that the cap may be manufactured as an integral piece by forging or casting. It will be seen that rotation of the cap 17 with respect to the sleeve 16 will advance the cap into or out of resonator tube 15 depending upon the clirection o~ rotation. As the cap i9 screwed out o~ resonator tube 15, the air column is lengthened and the resonant pitch of the air column is lowered. Conversely, if the cap 17 is rotated in the opposi-te direction so that it advances into the resonator tube,the length of the air column is shortened and the resonate pitch thereof is raised.
It is axiomatic that loose or poor fitting threaded couplings are less expensive than smooth, tight fitting threaded couplings. Loose threaded couplings, how~
ever, cannot be used for tuning ad~ustment means because the vibrating air column will cause any loose element to vibrate and produce a very undesirable buzzing sound. Thus, it is essential that the threads be smooth running and 30 have no "shake" so that this undesirable buzzing sound will be avoided.
It is also necessary that the threads provide a reasonable pneumatic seal between the cap 17 and the resonator tube 15. This necessity arises from the need to 35 have highly efficient acoustical resonators. As any organist or wind instrument player can attest, a rather smallair leak can very adversely affect tonal response.
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PHA 40521 5 30.5J988 There are thus, conflicting considerations in the detailed design and construction for a resonator tuning adjustment means. The cooperating parts must fit tightly to prevent buzzing and to provide a good pneu-matic seal. The tight ~itting relationship may alsoprovide for holding the adjustment onc~e it is made. On the other hand, if the adjustment is to be capable of being quickly and easily made, the parts must not fit together so tightly that they ca~not be easily and quickly adjusted. Naturally, it is desirable to provide a tuning adjustment means that does not require the a~ist to use tools.
One solution to this problem with which we have achieved some success is to place a viscous material interposed betweell the mating threads of cap 17 and the sleeve 16. The viscous material~ such as automobile chassls lube grease, or wheel bearing lubricant, simultaneously prevents vibration between the cap and sleeve, provides a good pneumatic seal, and permits easy rotation of the cap with respect to the sleeve. Not enough time or opera-tion under varying conditions has been experienced~howe~er, to say whether this will be a long-term solution.
Changes in the sealing ability or lubricity of the material may affect its performance. The short-term performance, however, has been good.
It is contemplated that an additional holding means to maintain a desired adjustment may be req~ired.
One such holding means is a helical spring 21 as illustrated in Fig, ~. Spring 21 is loaded in compression 30 between flange 19 and sleeve 169 and thereby provides a frictional holding ~orce that will oppose rotation of cap 17 with respect to sleeve 16.
Another embodiment of the holding means is illustrated in Fig. 5 wherein flange 19 is provided with knurling or the like about its circumference and is en~aged by a finger type spring member 22 affixed to the ~ side of tube 15, or sleeve 16. Spring member 22 may, of : ~:
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, .
.
, ~ ' - ' ' .. ' ' PI-IA 40521 6 30.5.1988 course, take many different shapes~ the particular shape shown in Figs 5 and 6 being merely illustrative. It is only necessary that spring member 22 engage some portion of cap 17, with sufficient frictional force to prevent undesired rotation. Further experimentation may show that the knurling 23 is not necessary.
Having read the foregoing specification with reference to the drawing and the numerous parts illustrated ; therein, a person skilled in the art of designing or manufacturing keyboard percussion musi-eal instruments will readily understand the structure and operation of the present invention. The foregoing description~ however, while setting forth the best mode contemplated by the in-ventor for ~aking and practicing the present invention~
should be considered as illustrative and not restrlctive in nature. It i9 intended that modifications and varia-tlons of the above-described invention that ~al:L within the spirit thereof shall be covered by the following claims.
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, P~ 40521 L~ 30.5.1988 means of an interference or press fit. Sleeve 16 may be considered to be a part of resonator tube 15, and may be integrally formed therewith or may be affixed by other means, e.g. adhesive bonding. Sleeve 16 is provided with internal or female threads to receive the external or male threads of cap 17. Cap 17 may have a tubular portion 18, a ring or flange portion 19 and a disc portion 20. While the prototypes for this ass~ bly have been fabricated as illustrated in Fig. 4, with the disc portion 20 being fillet welded to the tubular oportion 18 and the ring or flange portion affixed by means of an interference or press fit, it is contemplated that the cap may be manufactured as an integral piece by forging or casting. It will be seen that rotation of the cap 17 with respect to the sleeve 16 will advance the cap into or out of resonator tube 15 depending upon the clirection o~ rotation. As the cap i9 screwed out o~ resonator tube 15, the air column is lengthened and the resonant pitch of the air column is lowered. Conversely, if the cap 17 is rotated in the opposi-te direction so that it advances into the resonator tube,the length of the air column is shortened and the resonate pitch thereof is raised.
It is axiomatic that loose or poor fitting threaded couplings are less expensive than smooth, tight fitting threaded couplings. Loose threaded couplings, how~
ever, cannot be used for tuning ad~ustment means because the vibrating air column will cause any loose element to vibrate and produce a very undesirable buzzing sound. Thus, it is essential that the threads be smooth running and 30 have no "shake" so that this undesirable buzzing sound will be avoided.
It is also necessary that the threads provide a reasonable pneumatic seal between the cap 17 and the resonator tube 15. This necessity arises from the need to 35 have highly efficient acoustical resonators. As any organist or wind instrument player can attest, a rather smallair leak can very adversely affect tonal response.
:
' ' ''''; :
; : ' ' .
PHA 40521 5 30.5J988 There are thus, conflicting considerations in the detailed design and construction for a resonator tuning adjustment means. The cooperating parts must fit tightly to prevent buzzing and to provide a good pneu-matic seal. The tight ~itting relationship may alsoprovide for holding the adjustment onc~e it is made. On the other hand, if the adjustment is to be capable of being quickly and easily made, the parts must not fit together so tightly that they ca~not be easily and quickly adjusted. Naturally, it is desirable to provide a tuning adjustment means that does not require the a~ist to use tools.
One solution to this problem with which we have achieved some success is to place a viscous material interposed betweell the mating threads of cap 17 and the sleeve 16. The viscous material~ such as automobile chassls lube grease, or wheel bearing lubricant, simultaneously prevents vibration between the cap and sleeve, provides a good pneumatic seal, and permits easy rotation of the cap with respect to the sleeve. Not enough time or opera-tion under varying conditions has been experienced~howe~er, to say whether this will be a long-term solution.
Changes in the sealing ability or lubricity of the material may affect its performance. The short-term performance, however, has been good.
It is contemplated that an additional holding means to maintain a desired adjustment may be req~ired.
One such holding means is a helical spring 21 as illustrated in Fig, ~. Spring 21 is loaded in compression 30 between flange 19 and sleeve 169 and thereby provides a frictional holding ~orce that will oppose rotation of cap 17 with respect to sleeve 16.
Another embodiment of the holding means is illustrated in Fig. 5 wherein flange 19 is provided with knurling or the like about its circumference and is en~aged by a finger type spring member 22 affixed to the ~ side of tube 15, or sleeve 16. Spring member 22 may, of : ~:
!
, .
.
, ~ ' - ' ' .. ' ' PI-IA 40521 6 30.5.1988 course, take many different shapes~ the particular shape shown in Figs 5 and 6 being merely illustrative. It is only necessary that spring member 22 engage some portion of cap 17, with sufficient frictional force to prevent undesired rotation. Further experimentation may show that the knurling 23 is not necessary.
Having read the foregoing specification with reference to the drawing and the numerous parts illustrated ; therein, a person skilled in the art of designing or manufacturing keyboard percussion musi-eal instruments will readily understand the structure and operation of the present invention. The foregoing description~ however, while setting forth the best mode contemplated by the in-ventor for ~aking and practicing the present invention~
should be considered as illustrative and not restrlctive in nature. It i9 intended that modifications and varia-tlons of the above-described invention that ~al:L within the spirit thereof shall be covered by the following claims.
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Claims (14)
1. Tuning adjustment means for a resonator tube of a keyboard percussion instrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten the air column thereof and rotation of said cap in the opposite direction moves said cap outwardly of said resonator tube to lengthen the air column thereof, sealing means for providing a pneumatic seal between the mating threaded portions of said resonator tube and said cap, and holding means for holding said cap in rotational position with respect to said resonator tube, said sealing means comprising mating threads on said cap and said resonator tube and a viscous material interposed therebetween.
2. Tuning adjustment means for a resonator tube of a keyboard percussion instrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten the air column thereof and rotation of said cap in the opposite direction moves said cap outwardly of said resonator tube to lengthen the air column thereof, sealing means for providing a pneumatic seal between the mating threaded portions of said resonator tube and said cap, and holding means for holding said cap in rotational position with respect to said resonator tube, said sealing means and said holding means comprising tight-fitting, smooth running mating threads on said cap and said resonator tube and a viscous material interposed therebetween.
3. Tuning adjustment means for a resonator tube of a keyboard percussion instrument comprising a cap having a tubular portion threadedly received within the lower end of said resonator tube whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten the air column thereof and rotation of said cap in the opposite direction moves said cap outwardly of said resonator tube to lengthen the air column thereof, sealing means for providing a pneumatic seal between the mating threaded portions of said resonator tube and said cap, and holding means for holding said cap in rotational position with respect to said resonator tube, wherein said holding means com-prises spring means operative between said resonator tube and said cap for providing a frictional holding force for opposing rotation of said cap with respect to said resonator tube.
4. The tuning adjustment means according to claim 3 in combination with said keyboard percussion instrument and said resonator tube wherein said instrument includes a tuned bar in association with said tube, said cap having a disk portion spaced lengthwise from the threads on said tubular portion thereof closing the end of said tube, said disk portion extending substantially normal to the tubular portion at a location that provides an air column in said resonator tube approximately resonant to the pitch of said associated tuned bar.
5. The invention of claim 3, wherein said spring means comprises a helical spring positioned between the lower end of said resonator tube and said cap.
6. The invention of claim 3, wherein said spring means comprises a finger type spring member affixed to said resonator tube and bearing against a portion of said cap.
7. The invention of claim 6, wherein said portion of said cap is knurled.
8. In a resonator tube of a percussion instrument, the improvement comprising:
an open lower end portion of said resonator tube having a pattern of threads;
a cap for closing said open end portion, said cap having a tubular portion with a pattern of threads for mating with said resonator tube threads whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten said air column and rotation of the cap in the other direction moves said cap outwardly of said resonator tube to lengthen said air column;
said resonator tube enclosing a vibrating air column during resonator operation which induces a vibration in said resonator tube and said cap; and said mating threads being dimensioned for providing a pneumatic seal across said threads between said cap and said resonator tube and for allowing manual rotation of said cap, while holding means for preventing rotation of said cap caused by said vibration, comprising spring means operative between said resonator tube and said cap for providing a frictional holding force for opposing rotation of said cap with respect to said resonator tube.
an open lower end portion of said resonator tube having a pattern of threads;
a cap for closing said open end portion, said cap having a tubular portion with a pattern of threads for mating with said resonator tube threads whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten said air column and rotation of the cap in the other direction moves said cap outwardly of said resonator tube to lengthen said air column;
said resonator tube enclosing a vibrating air column during resonator operation which induces a vibration in said resonator tube and said cap; and said mating threads being dimensioned for providing a pneumatic seal across said threads between said cap and said resonator tube and for allowing manual rotation of said cap, while holding means for preventing rotation of said cap caused by said vibration, comprising spring means operative between said resonator tube and said cap for providing a frictional holding force for opposing rotation of said cap with respect to said resonator tube.
9. The invention of claim 8 wherein said spring means comprises a helical spring positioned between the lower end of said resonator tube and said cap.
10. The invention of claim 8 wherein said spring means comprises a finger type spring member affixed to said resonator tube and bearing against a portion of said cap.
11. The invention of claim 10 wherein said portion of said cap is knurled.
12. The resonator tube according to claim 8 in combina-tion with said percussion instrument having said resonator tube and an associated tuned bar, wherein said cap has a disk portion spaced lengthwise from the threads on said tubular portion thereof closing the end of said tube, said disk portion extending substan-tially normal to the tubular portion at a location that provides an air column in said resonator tube approximately resonant to the pitch of an associated tuned bar.
13. In a resonator tube of a percussion instrument, the improvement comprising:
an open lower end portion of said resonator tube having a pattern of threads;
a cap for closing said open end portion, said cap having a tubular portion with a pattern of threads for mating with said resonator tube threads whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten said air column and rotation of the cap in the other direction moves said cap outwardly of said resonator tube to lengthen said air column;
said resonator tube enclosing a vibrating air column during resonator operation which induces a vibration in said resonator tube and said cap; and said mating threads being dimensioned for providing a pneumatic seal across said threads between said cap and said resonator tube and for allowing manual rotation of said cap while preventing rotation of said cap caused by said vibration, said pneumatic seal comprising mating threads on said cap and said resonator tube and a viscous material interposed therebetween.
an open lower end portion of said resonator tube having a pattern of threads;
a cap for closing said open end portion, said cap having a tubular portion with a pattern of threads for mating with said resonator tube threads whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten said air column and rotation of the cap in the other direction moves said cap outwardly of said resonator tube to lengthen said air column;
said resonator tube enclosing a vibrating air column during resonator operation which induces a vibration in said resonator tube and said cap; and said mating threads being dimensioned for providing a pneumatic seal across said threads between said cap and said resonator tube and for allowing manual rotation of said cap while preventing rotation of said cap caused by said vibration, said pneumatic seal comprising mating threads on said cap and said resonator tube and a viscous material interposed therebetween.
14. In a resonator tube of a percussion instrument, the improvement comprising:
an open lower end portion of said resonator tube having a pattern of threads;
a cap for closing said open end portion, said cap having a tubular portion with a pattern of threads for mating with said resonator tube threads whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten said air column and rotation of the cap in the other direction moves said cap outwardly of said resonator tube to lengthen said air column;
said resonator tube enclosing a vibrating air column during resonator operation which induces a vibration in said resonator tube and said cap; and said mating threads being dimensioned for providing a pneumatic seal across said threads between said cap and said resonator tube and for allowing manual rotation of said cap while preventing rotation of said cap caused by said vibration, said pneumatic seal comprising tight-fitting, smooth running mating threads on said cap and said resonator tube and a viscous material interposed therebetween.
an open lower end portion of said resonator tube having a pattern of threads;
a cap for closing said open end portion, said cap having a tubular portion with a pattern of threads for mating with said resonator tube threads whereby rotation of said cap in one direction advances said cap into said resonator tube to shorten said air column and rotation of the cap in the other direction moves said cap outwardly of said resonator tube to lengthen said air column;
said resonator tube enclosing a vibrating air column during resonator operation which induces a vibration in said resonator tube and said cap; and said mating threads being dimensioned for providing a pneumatic seal across said threads between said cap and said resonator tube and for allowing manual rotation of said cap while preventing rotation of said cap caused by said vibration, said pneumatic seal comprising tight-fitting, smooth running mating threads on said cap and said resonator tube and a viscous material interposed therebetween.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US11448487A | 1987-10-28 | 1987-10-28 | |
| US114,484 | 1987-10-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1295858C true CA1295858C (en) | 1992-02-18 |
Family
ID=22355511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000581204A Expired - Lifetime CA1295858C (en) | 1987-10-28 | 1988-10-25 | Resonator tuning adjustment for keyboard percussion instruments |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2718717B2 (en) |
| CA (1) | CA1295858C (en) |
| DE (1) | DE3830490A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2717605A1 (en) * | 1994-03-16 | 1995-09-22 | Hebrard Robert | Musical instrument |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5638553Y2 (en) * | 1979-12-20 | 1981-09-08 | ||
| JPS6228906U (en) * | 1985-08-07 | 1987-02-21 | ||
| JPH0742973B2 (en) * | 1985-09-27 | 1995-05-15 | 工業技術院長 | Spring washer |
-
1988
- 1988-09-08 DE DE19883830490 patent/DE3830490A1/en not_active Ceased
- 1988-10-25 CA CA000581204A patent/CA1295858C/en not_active Expired - Lifetime
- 1988-10-25 JP JP63267325A patent/JP2718717B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01147597A (en) | 1989-06-09 |
| DE3830490A1 (en) | 1989-05-11 |
| JP2718717B2 (en) | 1998-02-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121205 |