US4667561A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manual string lock with adjustable locking action
Assignee: Individual
•
Filing: 1986-06-10
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Granted: 1987-05-26
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Expires: 2006-06-10
Abstract
Abstract A manual string lock for clamping the strings of a musical instrument adjacent the nut is disclosed. The string lock includes an adjustable clamping mechanism for accommodating strings of different diameters. A unique cam-shaped lever and wedge combination is provided to lock and release the strings. The levers are rotatably connected with the string lock base for rotation about a horizontally and longitudinally offset axis. The cam surface of each lever abuts against a corresponding wedge. Manual rotation of the levers to an overcenter position displaces the wedges longitudinally which in turn vertically displaces the clamping screw and block assemblies, whereby the strings of the instrument are clamped between the clamping blocks and the string lock base.
Inventors
- 👤 David C. Storey
- 👤 David J. Petschulat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:22
CPC Classifications
G; G10; G10D; G10D1/00; G10D1/04; G10D1/05; G10D1/08; G10D3/00; G10D3/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
180 words
Apparatus for clamping the strings of a musical instrument adjacent the nut at the head portion of the instrument, comprising (a) a base having front, rear, top, and bottom surfaces, said base containing (1) a plurality of spaced, parallel first recesses in said top surface; (2) a plurality of spaced, parallel second recesses in said bottom surface; (3) a plurality of first through-openings extending between said front and rear surfaces and communicating with said second recesses, respectively, the instrument strings passing through said first through-openings and said second recesses; and (4) a plurality of second through-openings extending between said first and second recesses; respectively; (b) means for connecting said base with the guitar head portion; (c) a plurality of clamping means arranged in said second recesses and said second through-openings, respectively, the portions of the instrument strings passing through said second recesses being arranged between said clamping means and said base; and (d) a plurality of wedge means arranged in said first recesses, respectively, for displacing said clamping means relative to said base to clamp and release the instrument string.
Claim 2
Dependent Claim
180 words
Apparatus for clamping the strings of a musical instrument adjacent the nut at the head portion of the instrument, comprising (a) a base having front, rear, top, and bottom surfaces, said base containing (1) a plurality of spaced, parallel first recesses in said top surface; (2) a plurality of spaced, parallel second recesses in said bottom surface; (3) a plurality of first through-openings extending between said front and rear surfaces and communicating with said second recesses, respectively, the instrument strings passing through said first through-openings and said second recesses; and (4) a plurality of second through-openings extending between said first and second recesses; respectively; (b) means for connecting said base with the guitar head portion; (c) a plurality of clamping means arranged in said second recesses and said second through-openings, respectively, the portions of the instrument strings passing through said second recesses being arranged between said clamping means and said base; and (d) a plurality of wedge means arranged in said first recesses, respectively, for displacing said clamping means relative to said base to clamp and release the instrument string.
Claim 3
Dependent Claim
31 words
Apparatus as defined in claim 1, and further comprising means arranged in said first recesses and connected with said base for displacing said wedge means to operate said clamping means, respectively.
Claim 4
Dependent Claim
26 words
Apparatus as defined in claim 2, wherein each of said wedge means comprises a wedge member containing a through-opening aligned with one of said second through-openings.
Claim 5
Dependent Claim
108 words
Apparatus as defined in claim 3, wherein said clamping means each comprise (1) a clamping block arranged in each of said second recesses and containing a threaded opening aligned with one of said second through-openings; and (2) a screw having head and body portions, said screw body portion being arranged in said wedge opening and said body second opening and threadably connected with said clamping block threaded opening, said screw head portion being arranged above and having a diameter greater than the minimum diameter of said wedge opening, said screw being rotatable to vertically displace said clamping block relative to said base to accomodate strings of different diameters.
Claim 6
Dependent Claim
50 words
Apparatus as defined in claim 4, wherein said base first recesses are defined by bottom walls which are inclined from said rear surface toward said front surface, and further wherein said wedge members have inclined bottom surfaces corresponding to and in sliding engagement with said first recess bottom walls, respectively.
Claim 7
Dependent Claim
24 words
Apparatus as defined in claim 5, wherein said wedge displacing means comprise a plurality of levers having cam surfaces engaging said wedge members, respectively.
Claim 8
Dependent Claim
16 words
Apparatus as defined in claim 6, and wherein said levers are rotatably connected with said base.
Claim 9
Dependent Claim
59 words
Apparatus as defined in claim 7, wherein said base contains a plurality of aligned third through-openings adjacent said rear surface and extending normal to said first through-openings and said levers containing openings aligned with said base third through-openings, and further comprising a pin extending through said base third through-openings and said lever openings, said levers rotating about said pin.
Claim 10
Dependent Claim
42 words
Apparatus as defined in claim 8, wherein said lever openings define a horizontally and longitudinally offset pivot axis, said levers being rotated through and locked in an over-center position with said cam surfaces engaging said wedge members to clamp the instrument strings.
Claim 11
Dependent Claim
17 words
Apparatus as defined in claim 9, wherein each clamping block is operable to clamp two instrument strings.
References Cited (Backward Citations)
US118353A
Cited
US550268A
Cited
US617915A
Cited
US1331203A
Cited
US3093220A
Cited
US4171661A
Cited
US4149443A
Cited
US4457201A
Cited
US4475432A
Cited
USD280330S
Cited
US4579033A
Cited
US4517874A
Cited
US4574678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |