APPARATUS FOR LENGTHENING THE VIBRATING LENGTH OF STRINGS ON A HARP

Abstract

Apparatus (32) for lengthening the vibrating length of strings (34) on a harp, which apparatus (32) comprises: (i) securing means (42) for securing one end of the strings (34); (ii) adjuster members (46) for increasing the length of the strings (34) in order to increase the tension in the strings and thereby alter the frequency of vibration of the strings (34); and (iii) mounting means (48) for mounting the apparatus (32) on the harp (36) and wherein: (iv) there is one of the adjuster members (46) for each one of the strings (34); and (v) the adjuster members (46) are pivotable adjuster members (46) which are pivotable between a string non-lengthening position and a string lengthening position.

Claims

1. An apparatus for lengthening vibrating lengths of strings on a harp, which apparatus comprises, for each string of the strings: securing means for securing one end of the string; an adjuster member for increasing the length of the string to increase tension in the string and thereby alter a frequency of vibration of the string; and mounting means for mounting the apparatus on the harp, and wherein: there is one of the adjuster members for each one of the strings; and the adjuster members are pivotable adjuster members which are pivotable between a string non-lengthening position and a string lengthening position.

2. The apparatus according to claim 1 in which, in use, the string non lengthening position is one in which the string vibrates at a non-adjusted frequency on the harp, and in which the string lengthening position is one in which the string is increased in length to increase tension in the string and thereby increase the frequency of vibration of the string.

3. The apparatus according to claim 1 in which the adjuster members act on the securing means to increase the lengths of the strings.

4. The apparatus according to claim 1 in which the securing means comprises a plurality of finger members, in which there is one of the finger members for each one of the strings, and in which each one of the finger members is operated by one of the adjuster members.

5. The apparatus according to claim 1 in which the securing means comprises a plurality of securing locations, and in which there is one of the securing locations for each one of the strings.

6. The apparatus according to claim 5 in which the securing locations are all in a straight line, and in which the adjuster members are of different shapes, with the different shapes increasing the length of the strings by different amounts.

7. The apparatus according to claim 5 in which the securing locations are holes.

8. The apparatus according to claim 1 in which the securing means is a securing plate.

9. The apparatus according to claim 1 in which the adjuster members are lever members.

10. The apparatus according to claim 9 in which each one of the lever members has a cam portion which operates on the securing means.

11. The apparatus according to claim 1 and including a rod member, and in which the adjuster members are pivotably mounted on the rod member.

12. The apparatus according to claim 11 in which each one of the adjuster members has a receiving slot for receiving the rod member.

13. The apparatus according to claim 1 in which the mounting means comprises a pair of apertured lugs arranged one at each end of the apparatus.

14. The apparatus according to claim 13 in which the securing means is a securing plate and the lugs are formed as an integral part of the securing plate.

15. The apparatus according to claim 1 and including fine tuning means.

16. The apparatus according to claim 15 in which the fine tuning means is a screw which in use locates in a frame of the harp, and which has a head for abutting against the adjuster means in order to provide fine tuning of the adjuster means.

17. A harp when provided with the apparatus according to claim 1.

Description

[0023] FIG. 1 is a view of a harp as disclosed in U.S. Pat. No. 4,936,182;

[0024] FIG. 2 is an enlarged view of a neck of the harp as shown in FIG. 1;

[0025] FIG. 3 is a view from the front, above and one side of first apparatus of the present invention for lengthening the vibrating length of strings on a harp;

[0026] FIG. 4 is a top view of the apparatus as shown in FIG. 3;

[0027] FIG. 5 is a partial cross section through the apparatus shown in FIG. 3 and shows an adjuster member in a sharp position;

[0028] FIG. 6 is a cross section like FIG. 5 but shows the adjuster member in a neutral position;

[0029] FIG. 7 is an enlarged cross sectional view like FIG. 5 but from the other side and showing the adjuster member in an intermediate position between the positions shown in FIGS. 5 and 6;

[0030] FIG. 8 is a perspective view like FIG. 3 but taken from a slightly different angle; FIG. 9 is a top view like FIG. 4 but omits the parts of a harp which are shown in FIG. 4;

[0031] FIG. 10 is a top view like FIG. 9 but of second apparatus of the present invention and one which has the illustrated measurements;

[0032] FIG. 11 is a front view of the apparatus as shown in FIG. 10 and has the illustrated measurements;

[0033] FIG. 12 is a rear view of part of the apparatus as shown in FIG. 11;

[0034] FIG. 13 is an end view of the apparatus as shown in FIG. 11;

[0035] FIG. 14 is a top view of a securing means forming part of the apparatus as shown in FIG. 10 and having the measurements shown;

[0036] FIG. 15 is a front view of the securing means shown in FIG. 14;

[0037] FIG. 16 is a perspective view of an adjuster member forming part of the apparatus as shown in FIGS. 10-12;

[0038] FIG. 17 is a side view of adjuster member shown in FIG. 16 and having the stated measurements;

[0039] FIG. 18 is a view looking from right to left of the adjuster member as shown in FIGS. 16 and 17 and having the stated measurements;

[0040] FIG. 19 is a view like FIG. 3 but shows third apparatus of the present invention;

[0041] FIG. 20 is a top view like FIG. 4 but of the apparatus as shown in FIG. 19;

[0042] FIG. 21 is a partial cross section like FIG. 5 but through the apparatus shown in FIG. 19 and shows an adjuster member in a sharp position; FIG. 22 is a cross section like FIG. 6 but shows the adjuster member in a neutral position; and

[0043] FIG. 23 is an enlarged cross sectional view like FIG. 21 but shows the adjuster member in an intermediate position between the positions shown in FIGS. 21 and 22.

[0044] Referring to FIGS. 1 and 2, there is shown a harp 2 as disclosed in U.S. Pat. No. 4,936,182. The harp 2 has a body 4, a neck 6, a post 8 and strings 10. The neck 6 is connected at one end 12 to the upper end 14 of the body 4. The other end 16 of the neck 6 is connected to the post 8 as shown. The post 8 has a lower end 18 which is connected to the lower end 20 of the body 4. The strings 10 are connected at their upper ends to tuning pins 22. The strings 10 are connected at their lower ends to a strip member 24 which is in turn connected to the face 26 of the body 4 as shown.

[0045] As shown in FIG. 2, the neck 6 is provided with bridge pins 28. There is one bridge pin 28 for each tuning pin 22. Each bridge pin 28 has a tapered groove 30 which receives the string 10 and thereby precisely defines the vibrating length of the string 10. The apparatus shown in the USA Patent operates by shortening the vibrating length of the strings 10 on the harp 2. The apparatus is mounted directly below the bridge pins 28 for each of the strings 10.

[0046] Referring now to FIGS. 3-9, there is shown first apparatus 32 of the present invention. The apparatus 32 is for adjusting the tension in harp strings 34 on the harp 36. The apparatus 32 operates by increasing the total length of the strings 34 and thereby increasing the tension in the strings 34 which increases the frequency at which the strings 34 vibrate. Thus the apparatus 32 is for increasing the length of the strings 34, rather than reducing the vibrating length of the strings 10 as disclosed in the USA patent. In the apparatus 32, the vibrating length of the strings 34 is kept constant by a rod member 62. For ease of illustration, only one string 34 has been shown and only harp frame parts 38, 40 have been shown.

[0047] The apparatus 32 comprises securing means 42 for securing one end 44 of the strings 34. The apparatus 32 also comprises adjuster members 46 for increasing the length of the strings 34 in order to alter the frequency of vibration of the strings 34. The apparatus 32 still further comprises mounting means 48 for mounting the apparatus 32 on the harp 36.

[0048] There is one of the adjuster members 46 for each one of the strings 34. The adjuster members 46 are pivotable adjuster members 46 which are pivotable between a string non-lengthening position which is shown in FIG. 6, and a string lengthening position which is shown in FIGS. 5 and 6. The lengthening of the strings 34 is effected by rotating the adjuster members 46 in order to increase the tension in the strings 34, and thereby to increase the frequency of a musical note that is able to be played by the strings 34. The adjuster members 46 act on the securing means 42 for increasing the length of the strings 34.

[0049] The securing means 42 comprises a plurality of finger members 50. There is one of the finger members 50 for each one of the strings 34. Each one of the finger members 50 is operated by one of the adjuster members 46. The securing means 42 comprises a plurality of securing locations 52 for the strings 34. There is one of the securing locations 52 for each one of the strings 34. The securing locations 52 are at varying distances from the mounting means 48 as can be appreciated from FIG. 4. The distance of each securing location 52 from the mounting means 48 determines the amount of lengthening of the string 34 and thereby the change in frequency of the string 34 and the change in the musical note that is able to be obtained from the string 34. As can also be appreciated from FIG. 4, the securing locations 52 are in the form of holes.

[0050] The securing means 42 is in the form of a securing plate. The adjuster members 46 are in the form of lever members. Each one of the lever members has a cam portion 54 which operates on the securing means 42.

[0051] The apparatus 32 includes a rod member 56. The adjuster members 46 are pivotably mounted on the rod member 56 as shown in FIGS. 5, 6 and 7. Each one of the adjuster members 46 has a receiving slot 58 for receiving the rod member 56.

[0052] The apparatus 32 includes a rod member 60 which acts a guide for causing the strings 34 precisely to engage the rod member 62 and thereby define exactly the vibrating length of the strings 34. This overall physical length of the strings 34 is then only increased, for example by 1-3 mm, when it is required to increase the tension in the strings 34 and thereby alter the frequency of vibration of the strings 34. As shown in FIGS. 5-7, there is one of the rod members 60, 62 positioned on either side of the strings 34. The mounting means comprises a pair of apertured lugs 64, 66. The apertured lugs 64, 66 are arranged one at each end of the apparatus 32 as shown in FIGS. 3 and 4. There is one aperture 68 in each of the lugs 64, 66. The lugs 64, 66 are formed as an integral part of the securing means 42 which is in the form of the securing plate.

[0053] The apparatus 32 includes fine tuning means 70. The fine tuning means 70 is in the form of a screw having a threaded shank 72 which screws into the frame part 40 as shown in FIG. 7. The fine tuning means 70 also has a head 74 which abuts against the adjuster means 46 as shown in FIG. 6 in order to provide fine tuning of the adjuster means 46. This fine tuning is able to be achieved by screwing the fine tuning means 70 into or out of the frame part 40.

[0054] The strings 34 are able to be connected at their ends 44 via the securing locations 52 by any suitable and appropriate fastener means. FIGS. 5, 6 and 7 show how the securing means 42 in the form of the plate is able to be secured to the frame part 38 via the mounting means 48 and the lugs 64, 66. As can be appreciated from FIGS. 5, 6 and 7, when the adjuster members 46 are pushed upwardly, they push the securing means 42 upwardly, and this in turn stretches the strings 34. FIG. 5 shows the illustrated adjuster member 46 in a sharp position. FIG. 6 shows the adjuster member 46 in a neutral position. The neutral position is also shown in FIG. 5 in broken lines. FIG. 7 shows the neutral position 46 in broken lines. FIG. 7 also shows the adjuster member 46 in a position between the position shown in FIG. 5 and the position shown in FIG. 6, The adjuster members 46 are able to give precision adjustment of their strings 34. The amount of tension to be increased can be fine tuned by the fine tuning means 70, for example to give a precise semi-tone increase after installation of the apparatus 32 on the harp 36.

[0055] In order to facilitate manufacture of the apparatus 32 at an optimum low cost, the adjuster members 46 are the same for every string 34. The distance from the securing locations 52 to the frame part 38 determines the amount of tension increase to the strings 36 and this is different for each string 36. The mounting means 48 in the form of the sheet metal plate is attached to the frame part 38 on its side as shown.

[0056] FIGS. 10-13 shown second apparatus 74 of the present invention. The apparatus 74 is basically the same as the apparatus 32 except that the apparatus 74 has been shown with specific size dimensions which are given in millimeters. Similar parts as in the apparatus 32 have been given the same reference numerals for ease of comparison and understanding.

[0057] In both the apparatus 32 and the apparatus 74, it will be seen that the rod members 56, 60 and 62 extend between, and are mounted on, end members 76, 78.

[0058] Referring now to FIGS. 19-23 there is shown third apparatus 80 of the present invention. Similar parts as in the apparatus 32 have been given the same reference numerals for ease of comparison and understanding.

[0059] In the apparatus 80, it will be seen that the rod members 60, 62 from the apparatus 32, 74 have been omitted. This can best be appreciated from a comparison of FIGS. 21 and 22 with FIGS. 5 and 6. Also from a comparison of FIGS. 21 and 22 with FIGS. 5 and 6, it will be seen that the adjuster members 46 still pivot about the rod member 56 but the adjuster members 46 do not have the receiving slots 58. The adjuster members 46 in the apparatus 80 have different shapes. More specifically the adjuster members 46 have different cam profiles 82. This compares to the single cam profile 84 in the apparatus 32. Because the cam profiles 82 are different to each other, they are able to increase the length of the strings 34 by different amounts, and thereby alter the frequency or vibration of the strings 34 by different amounts.

[0060] From a comparison of FIG. 19 with FIG. 3, it will be seen that in the apparatus 80, the securing locations 52 are in a straight line. This compares with the curved line for the securing locations 52 in the apparatus 32. In the apparatus 80, the finger members 50 are still sprung finger members 50. Referring to FIG. 22, in use of the apparatus 80, the distance 86 from the centre 88 of the cam head 90 of each adjuster member 46 to the top of the cam profile 82 where it touches the finger member 50 determines the amount of length increase and therefore tension increase for each string 34. This distance is different for each string 34 and this different distance causes the strings 34 to vibrate at different required frequencies in order to obtain the different required tones from each of the strings 34. Increasing the tension in a string 34 increases the frequency of the musical note that is produced. As in the apparatus 32, 74, 80 the amount of tension for each string 34 is able to be fine-tuned by the fine tuning means 70. From a comparison of FIGS. 19 and 20 with FIGS. 3 and 4, it will be seen that in the apparatus 80, the shape of the finger members 50 as viewed from above is different from the shape of the finger members 50 as viewed from above in the apparatus 32. The finger members 50 may be of other shapes.

[0061] The apparatus 32, 74, 80 of the present invention may be used to allow the frequency of individual strings 34 to increase by one or two semitones. The apparatus 32, 74, 80 operates by stretching the strings 34 instead of shortening the vibrating length. Stretching the strings increases the tension and therefore the pitch. The apparatus 32, 74, 80 provides the possibility of three pitches per string, i.e. flat, neutral and sharp. The apparatus 32, 74, 80 may be produced at a decreased cost compared with known apparatus which shortens the vibrating length of the strings. This cost reduction may be achieved by a decrease in the amounts of parts required for the apparatus of the present invention, and also in the ability to standardize some of the component parts. The apparatus 32, 74, 80 is easily adjusted by the fine tuning means 70. The apparatus 32, 74, 80 is able to be robust in use and provide better fall protection because the adjuster means 46 in the form of the levered cams do not stick out in the neutral position shown in FIG. 6.

[0062] The apparatus of the present invention allows for the strings to be centrally placed in the harp, supported equally at both sides. This may provide structural advantages, for example the absence of a resulting torque on the frame as in the non-central known apparatus, which in turn means lower material property requirements for the overall harp frame and thereby may reduce cost. Also, the strings are not mechanically pressed at one point repeatedly to shorten the vibrating length, which may result in longer string life.

[0063] The apparatus of the present invention may be produced as an inexpensive low threshold apparatus for entry level use of an electric harp, for example for children. Apparatus for changing the vibrating length of strings on a harp typically forms a major component cost part for the harp. The ability of the apparatus of the present invention to reduce this cost is a major advantage. A further advantage is the ability to change the tension in the strings as a primary mechanism for instantly shifting the pitch by semitones.

[0064] It is to be appreciated that the embodiments of the invention described above with reference to the accompanying drawings have been given by way of example only and that modifications may be effected. Thus, for example, other types of securing means 42 adjuster members 46 and mounting means 48 may be employed. The strings of the harp may stretch to any suitable lengths. The stretching of the strings may depend upon their length, material properties and diameter. The strings of the harp may be made of any suitable materials including nylon, carbon fiber reinforced nylon, sheep gut and metals. The apparatus may be used on different types of harp. Individual components shown in the drawings are not limited to use in their drawings and they may be used in other drawings and in all aspects of the invention. The invention also extends to the individual components mentioned and/or shown above, taken singly or in any combination.