|United States Patent
April 5, 1983
String tuning and fastening arrangement
A stringed musical instrument has separate members commonly mounted at the
head of the instrument for providing individual support and adjustment for
each of the strings. Each fastening and tuning member comprises an
elongated support piece carrying a clamping member that engages and clamps
the string with the clamping action increasing as the string is tensioned.
The tension is adjusted for tuning purposes by longitudinally displacing
the elongated support piece. In the preferred embodiment, the clamping
member is a slidable button operating on a forced wedge principle.
Scholz; Donald T. (13 Rich Valley Rd., Wayland, MA 01778)
April 30, 1981|
|Current U.S. Class:
||84/297R; 84/205; 84/312R; 984/119; 984/DIG1 |
|Field of Search:
84/200,205-207,297 R,312 R,312 P,201-204,208,282,318
References Cited [Referenced By]
U.S. Patent Documents
Primary Examiner: Franklin; Lawrence R.
Attorney, Agent or Firm: Wolf, Greenfield & Sacks
What is claimed is:
1. Fastening and tuning apparatus for a stringed musical instrument
a support base,
means for securing the support base to the instrument,
a clamping member,
a support piece for carrying said clamping member,
and manual tuning means coupled to and for longitudinally displacing said
support piece to increase and decrease string tension to thereby tune said
stringed musical instrument,
said clamping member comprising a wedge member constrained to move linearly
along an inclined plane toward the base of the support piece to wedge the
string against the base of the support piece.
2. Apparatus as set forth in claim 1 wherein said manual adjusting means
includes a lead screw and associated thumbwheel for longitudinally
displacing said elongated support piece.
3. Apparatus as set forth in claim 1 wherein said support piece is
elongated and of channel shape to accommodate therein said clamping
4. Apparatus as set forth in claim 1 including guide means for said support
5. Apparatus as set forth in claim 1 wherein said clamping member provides
string contact along a segment thereof and in a way so as to provide
little or no bending of the tensioned portion of the string by the
clamping member and wherein said support piece which carries said clamping
member moves substantially longitudinally in the direction of said string
with clamping occurring in close proximity to the nut.
6. Apparatus as set forth in claim 1 wherein said clamping member comprises
an actuating body carrying therebelow, a roller and a slide member, said
roller disposed between said actuating body and slide member and adapted
for angular motion relative to said support piece base.
7. Apparatus as set forth in claim 6 wherein said actuating body and slide
member are permitted slight relative movement.
8. Apparatus as set forth in claim 7 including a biasing spring disposed
between said actuating and slide member to return them to an initial
9. Apparatus as set forth in claim 8 wherein said actuating body is
supported in a channel defined in said support piece by pin means.
10. Apparatus as set forth in claim 6 wherein said support piece has a base
and spaced upright walls extending from the base and forming a channel for
receiving the clamping member.
11. Apparatus as set forth in claim 10 wherein the upright walls each have
an angled slot for receiving ends of the roller.
12. Apparatus as set forth in claim 11 wherein the slide member is under
the actuating member and slides relative thereto to force the roller under
pressure against the angled slots and against the slide member to secure
BACKGROUND OF THE INVENTION
The present invention relates in general to stringed musical instruments
and pertains, more particularly, to an improved string tuning and
fastening apparatus preferably employed at the head of the stringed
instrument and for providing both improved clamping of each string
individually, and improved fine adjustment of the tension of each string
In a conventional guitar or other string instrument, the adjustment of the
strings is usually accomplished at the head of the instrument and this
adjustment means usually comprises a series of pegs or keys which are
rotatable for individually varying the tension on each string. The peg
typically has a hole through which the string must be passed and tied.
However, the problem is that the string tends to slip on the peg and there
is usually a need for continuous adjustment of the individual strings.
Furthermore, with the conventional arrangement, each of the strings is
tied to its associated peg or key at a relatively long distance from the
instrument nut and there is a bending of the string near the peg or key.
This is undesirable in that there may well be unequal tensions in the
string on opposite sides of the nut due to friction at the nut. In
accordance with the present invention it is preferred to have the clamping
of the string occur by an improved clamping member wherein the clamping
occurs relatively close to the nut with each string being clamped so as to
cause little or no bending of the string near the clamp.
Accordingly, one object of the present invention is to provide an improved
fastening and tuning arrangement for use with a stringed musical
instrument and which alleviates the prior art problems typically
associated with the use of a conventional adjusting lug, peg or key.
Another object of the present invention is to provide an improved tuning
and securing member characterized by an improved clamping wedge that
provides clamping along a short segment of the string close to the nut.
This "short segment" clamping concept is employed preferably in accordance
with the present invention in combination with a means for longitudinally
displacing the clamping member such as by the use of an elongated support
piece for carrying the clamping member. Also, in accordance with the
invention the clamping member preferably tightens on a forced-wedge
principle as the tension is increased to automatically increase the
locking force of the member to the associated string.
Various types of tuning, adjusting, and securing members are disclosed in
such prior art patents as Leger U.S. Pat. No. 3,596,552; Walder U.S. Pat.
No. 2,241,284; Jauch U.S. Pat. No. 2,322,137; Oettinger U.S. Pat. No.
1,431,250; Schlemmer U.S. Pat. No. 974,095; and Smith, et al U.S. Pat. No.
3,407,696. These patents all typically show string support means that
employ some type of a pivot arrangement. For example, see the Oettinger
and Jauch patents. It does not appear from any of these prior art patents
that they teach the concept of the present invention of longitudinally
clamping the string without causing bending in the tensioned portion of
the string, particularly in combination with the longitudinal movement of
the clamping mechanism to provide fine tuning. Furthermore, many of these
patents teach an adjusting feature, not at the head of the instrument but
instead at the base of the instrument. It is noted that in both the Jauch
and Oettinger patents that the adjustment is provided at the body of the
instrument and not at the fingerboard end.
Thus, another object in accordance with the present invention is to provide
an individual string tuning member adapted for replacement of conventional
tuning pegs and the like mounted at the head of the instrument and wherein
each of the strings is longitudinally clamped at a position closely
adjacent to the nut of the instrument.
SUMMARY OF THE INVENTION
To accomplish the foregoing and other objects of this invention, there is
provided a fastening and tuning apparatus comprising a support base
secured to the head of the instrument and adapted to carry a plurality of
separate adjusting means corresponding in number to the number of strings
of the stringed instrument. Each fastening and adjusting means comprises
an elongated support piece which in turn carries a clamping member
supported on the elongated support piece. The clamping member preferably
comprises an actuating button supported with a slide member with the
actuating button being wedged against the slide member which in turn
clamps against the string. The actuating button operates on a wedge
principle and a spring is disposed between the actuating button and the
slide member to return these two components to a start position when the
components are released. The string adjustment or tuning is accomplished
by means of a separate manually adjustable means for providing the fine
longitudinal displacement of the elongated support piece. In one
embodiment, the manually adjustable means is in the form of a lead screw
with a thumb wheel.
In accordance with the invention the strings are each individually clamped
at approximately the same distance from the nut of the instrument. Because
the nut represents the primary support surface, it is preferred to have
the clamping occur as close to the nut as possible.
Thus, there are basically two factors that are important in minimizing the
bending action of the string. First, it is preferred to make the distance
between the nut and where the string is clamped as short as possible so as
to keep the stretching of the string to a minimum particularly between
those two points. Secondly, to eliminate problems associated with winding
the string around a peg or the like, in accordance with the present
invention the string is maintained at a straight line behind the nut and
is clamped in this straight line position. In accordance with the
preferred embodiment, the clamping member operates on a wedge principle so
that as the string is tensioned, the clamping action and clamping force is
BRIEF DESCRIPTION OF THE DRAWINGS
Numerous other objects, features and advantages of the invention should now
become apparent upon a reading of the following detailed description taken
in conjunction with the accompanying drawings, in which:
FIG. 1 is a plan view of the head of a stringed musical instrument such as
a guitar showing the tuning and fastening apparatus of this invention;
FIG. 2 is an enlarged view showing the tuning and fastening arrangement for
a single string;
FIG. 3 is a cross-sectional view as taken along line 3--3 of FIG. 2 showing
in particular the clamping member carried on the elongated support piece;
FIG. 4 is a cross-sectional view taken along line 4--4 of FIG. 3;
FIG. 5 is a cross-sectional view taken along line 5--5 of FIG. 3; and
FIG. 6 is a fragmentary enlarged view, similar to the view of FIG. 3 and
showing the clamping action.
FIGS. 1-6 show the preferred construction of the present invention
employing a novel clamping member adapted for the clamping of the string
of the musical instrument along a segment of its length, in combination
with the longitudinal movement of the support piece for the clamp member.
Although the concepts of the invention are described in connection with a
guitar, it is understood that these principles may also be applied to
other stringed musical instruments.
FIG. 1 shows a fragment of a musical instrument particularly including the
head 10 wherein, in a conventional guitar, the tuning pegs or keys are
supported. In place of this conventional arrangement is the apparatus
described in FIGS. 1-6. FIG. 1 also shows a plurality of strings 12 each
of which is supported, usually in a fixed position at the body end of the
instrument. Each of these strings also pass over the support nut 14 and
each is individually secured in the improved fastening and tuning
arrangement of this invention. In the case of a six string instrument as
depicted in FIG. 1, there are of course, six separate adjusting means, one
corresponding to each of the strings. In order to simplify the description
herein, one adjusting means is described in detail, the others being
substantially identical with the exception of the placement of the
thumbwheels, and the more elongated lead screws associated therewith as
clearly depicted in FIG. 1.
The apparatus of this invention comprises a common support base 16 having a
plurality of cut-outs 18 for accommodating the thumbwheels 20. Each of the
thumbwheels 20 is manually engaged by the instrument player to rotate the
corresponding lead screw 22. The support base 16 is preferably of a shape
corresponding substantially to the shape of the head 10 of the instrument.
At the forward end of the support base 16 there is provided an upwardly
stepped section 24 having a plurality of slots 26, as depicted in FIGS. 1
and 3, arranged substantially in line with each other transversely across
the section 24. Each of these slots 26 receives a finger 28 extending from
the elongated support piece 30. The finger 28 forms a guide for
restricting the piece 30 to longitudinal displacement substantially in
line with the string 12. In FIG. 3 the arrow 32 indicates the general
direction of movement of the support piece 30. FIG. 3 also shows the
finger 28 in the slot 26 forming a guide means for the piece 30.
The elongated support piece 30 comprises a base 34 which extends into the
finger 28, and upright walls 36 and 38 extending from the base and
essentially forming a channel for receiving, inter alia the clamping
member 40. The clamping occurs on a forced-wedge principle with the string
12 being essentially sandwiched between the clamping member and the base
34. It is also noted particularly in FIG. 6, that the clamping or securing
occurs along a segment 12A of the string 12.
The upright walls 36 and 38 have respective slots 42 and 44 extending as
illustrated in particular in FIGS. 3 and 6 angularly to the base 34. These
elongated slots carry a pin 46 which slidably supports a wedge member 40
in the channel defined in the support piece 30.
The wedge member 40, as indicated previously, operates on a wedge principle
and includes a plastic or the like actuating button 48, a metal slide 50,
and spring 52. The button 48 has a front slot 49 for receiving one end 51
of the metal slide 50. The rear end 53 of the metal slide is received in a
rear slot 55 of the button 48. The spring 52 biases the slide bar 50 so
that its ends 53 is extending out of the slot 55 such as in the position
shown in FIG. 3. At the same time the end 51 of the slide is substantially
fully into the front slot 49 of the actuating button. On the other hand,
FIG. 6 shows the relationship between the button 48 and the slide 50 in
the fully clamped position of the cam member.
A common guide member 56 is supported from the support base 16. FIG. 3
shows one of a plurality of securing bolts or studs 58 that extend both
through member 56 and support base 16 into the instrument. There are
preferably six bolts that form the main securing means of the apparatus to
the istrument. The guide member 56 includes an upright wall 60 and a top
wall 62 overlying the rear section of the elongated support piece 30. The
walls 60 and 62 are provided with six apertures 64 through which the
elongated support piece extends. The upper wall 62 forms an upper limit
guiding the support piece 30.
The cam support piece 30 is moved in the direction of arrow 32 by means of
a combination of a lead screw 22 and the thumbwheel 20. The drawing shows
the full end of the lead screw 22 having a reduced diameter section 70
which passes through upright wall 72 of the support piece 30. The lead
screw may be secured to the wall 72 by means of a lock ring 73. The lead
screw 22 is permitted to rotate relative to the upright wall 72. The
longitudinal movement of the support piece 30 occurs by means of rotation
of the lead screw 22 at the thumbwheel 20. In this regard, the thumbwheel
20 is securely fastened or keyed to the lead screw 22. The rear end of the
lead screw 22 passes through retaining block 76 as shown in FIGS. 1-3.
Block 76 extends from the support base 16 and has an internally threaded
aperture for receiving the lead screw. Other stops may be provided such as
ones associated with the knob or wheel to stop it from turning past a
predetermined rotation position. At the very rear of the lead screw there
may be provided a stop, not shown in the drawing.
When a string 12 is to be replaced, the actuating button 48 may be moved to
the position shown in phantom in FIG. 6. FIG. 6 also shows the end of the
string 12 passing under the clamping member and hitting against the
deflection plate 78. This plate 78 is suitably secured in the elongated
support piece 30. FIG. 3 also shows the string 12 extending guided by the
plate 78. FIG. 6 shows in solid, the position of the cam member when it is
locked to the string. It is noted that in this position the spring 52 is
compressed and the slide member is moved forwardly relative to the plastic
actuating button 48. The string may be pulled by hand as it extends up
along the deflection plate 78, until it is relatively taut. The button 48
which carries the pin 46 which is rotatable within the button 48, is then
moved forwardly with some force by hand to urge the slide member 50
against the string 12. The pin 46 rides down the guideways or slots in the
side walls of the elongated piece 30. These slots are inclined as clearly
indicated in FIGS. 3 and 6 to provide a tightening wedge action. The pin
46 may slightly rotate as the button is depressed and as the elongated
piece is moved to tighten the string. As the tension is increased by
translation of the elongated piece 30, there is movement of the metal
slide member 50 relative to the plastic actuating button 48. Prior to this
movement, the spring 52 is in its maximum length position, but as the
elongated piece 30 moves, the spring is compressed at least partially and
there is slight relative movement between the actuating button 48 and the
slide member 50. This locks the metal slide member tightly against the
string 12. The more that the elongated piece is moved, the tighter the
wedging action becomes between the cam member and the elongated support
When the tension is to be released, the elongated support piece is moved
forwardly so that the tension is taken off of the string 12. However, the
cam member is still locked to the spring due to the wedging action of the
pin and the associated components including the slide member 50. The
button may then be moved by hand to release contact between the rigid
slide member 50 and the string. For example, the button may be moved from
the position shown in solid in FIG. 6 to the position shown in phantom.
This manual movement of the actuating button 48 releases the pin 46 so
that it progresses up its guide slots. The spring 52 returns the slide
member to its start position relative to the plastic actuating button 48,
with the spring 52 again in its fully extended position as shown in FIG.
Having described one embodiment of the present invention, it should now be
apparent to those skilled in the art that numerous other embodiments are
contemplated as falling within the scope of this invention. For example,
the concept of this invention may be applied to other stringed instruments
having fewer or greater than six strings as depicted herein. Furthermore,
the apparatus of this invention may be constructed in, for example, metal
or plastic or any other suitably rigid materials. Also, in accordance with
the present invention it has been found that preferably all clamping
occurs at substantially the same distance from the nut. It is preferred
that this clamping occur within 2" of the nut and in one embodiment is at
about 11/2" from the nut.
In another alternate embodiment of the present invention the combined
function of clamping and longitudinal adjustment can be separated. Thus,
for example, the clamping may occur in the manner described in FIG. 1 at
the head of the neck with the adjustment for longitudinal movement of the
string occurring at the body end of the instrument. Alternatively, the
longitudinal adjustment may occur at the head of the neck while the wedge
member for clamping the string may be at the body end of the instrument.
In either instance basically the same structures can be used as described
in FIGS. 1-6. Thus, for the example wherein the wedge member is at the
body end, the wedge arrangement shown in the drawing may be employed in
association with a stationary clamping plate thereunder. At the neck end
of the instrument then the string can be secured with the use of the usual
ball end of the string in a holder. In that instance then the longitudinal
displacement structure shown in the drawing may be used in substance to
move the string longitudinally at the neck end of the instrument.
* * * * *
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