US3834266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cartridge string guitar assembly
Assignee: Individual
•
Filing: 1973-11-23
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Granted: 1974-09-10
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Expires: 1993-11-23
Abstract
Abstract A cartridge string guitar assembly having a key head slidably mounted in a slideway upon a neck shank operatively movable by a cam and lever mechanism. Six square-headed key posts are revolvably mounted on the key head and connected to gear-driven tuning handles. A cartridge string housing comprising all six guitar strings as a unit and a rear bracket containing the opposite ends of the strings is inserted onto the guitar by means of six cartridge spools within the housing and each having a square hole provided vertically through its center which interlocks with its respective square-headed key post. Each of the spools has a guitar string wrapped around its cylindrical body for individually tuning same. A lever is then inserted into the pivot shaft of the cam, the shaft having a square socket vertically through its axis for turning the cam from inoperative to operative position thereby forcing the key head outward on its slideway creating a miminum amount of tension on the strings. The opposite ends of the strings are contained in a detachable bracket which is designed to be either injected into a groove of a bridge or extracted from the same in a simple operation. The strings are subsequently tuned in the usual manner.
Inventors
- 👤 R Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:07
CPC Classifications
G; G10; G10D; G10D3/00; G10D3/14
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
152 words
A cartridge string guitar assembly including a sliding Ushaped key head adapted to receive a unified pair of cartridge string housing means, said housing means comprising six guitar strings therein; a slider means mounted horizontally on each of the two inner sides of said key head; a guitar neck shank recessed narrowly at the front portion thereof which slidably extends into the hollow intermediate portion of said key head; a slideway means mounted horizontally on each of the two outer sides of said neck shank thereby facilitating a sliding mechanism for said key head; a cam means pivotally mounted on a base support means upon the front end portion of said neck shank for operatively projecting said key head forward; a bridge means securely mounted to the normal body of the guitar having a deeply recessed horizontal groove disposed through the backside thereof for receiving a detachable rear string bracket means therein.
Claim 2
Dependent Claim
152 words
A cartridge string guitar assembly including a sliding Ushaped key head adapted to receive a unified pair of cartridge string housing means, said housing means comprising six guitar strings therein; a slider means mounted horizontally on each of the two inner sides of said key head; a guitar neck shank recessed narrowly at the front portion thereof which slidably extends into the hollow intermediate portion of said key head; a slideway means mounted horizontally on each of the two outer sides of said neck shank thereby facilitating a sliding mechanism for said key head; a cam means pivotally mounted on a base support means upon the front end portion of said neck shank for operatively projecting said key head forward; a bridge means securely mounted to the normal body of the guitar having a deeply recessed horizontal groove disposed through the backside thereof for receiving a detachable rear string bracket means therein.
Claim 3
Dependent Claim
77 words
The construction defined in claim 1 in which the key head includes six square upstanding key posts independently spaced thereon for receiving the string housing means, said square key posts revolvable upon rotative movement thereof from gear-driven tuning handles; in which a follower lining means is securely fixed to the inner front surface contour of said key head; and in which a vertical elongated locking slot means is provded at the end of said follower lining means.
Claim 4
Dependent Claim
135 words
The construction defined in claim 1 in which the cam means includes a shaft adapted to pivot said cam means mounted in proper holes of the base support means and having a square socket which extends vertically through the axis of said shaft; a detachable lever means having a square drive provided on one end thereof for inserting same into said square socket thereby actuating said cam means from inoperative to operative position; and in which a roller bearing means is revolvably mounted in the upper equidistant curve of said cam means whereby said roller bearing means operatively revolves against the follower lining means and subsequently rests in the elongated locking slot when said cam means is turned from inoperative to operatively tangent position thereby motoring the key head outwardly forward on the slideway means.
Claim 5
Dependent Claim
78 words
The construction defined in claim 1 wherein the rear string bracket means includes recessed corners at the front portion thereof to form a central point for releasably injecting said rear bracket means into the horizontal groove until its wide portion abuts with the corners of said groove of the bridge means; and in which said rear bracket means includes six horizontally aligned holes for receiving the tail portions of the six respective guitar strings therein as a unit.
Claim 6
Dependent Claim
105 words
The construction defined in claim 1 in which the pair of cartridge string housing means are formed in slender channel-shaped sections linked together by a flexible connecter means securely fixed to the front portions thereof for combining the said pair in parallel unison; in which six cylindrical string spools are independently revolvably disposed in vertical openings in said cartridge housing means each receiving a respective guitar string encircled thereon; and in which a square socket extends vertically through the axis of each said string spool for releasably installing same onto the corresponding square key posts of the key head for independently tuning each string manually.
Claim 7
Dependent Claim
115 words
The construction defined in claim 5 in which the cartridge string housing means includes six string guide means independently spaced near their respective spools, said string guide means each comprising an eyelet through which the front portion of a guitar string protrudes to prevent unraveling of same when not in use; in which an auxiliary eyelet is provided in each of said spools into which a guitar string tip extends to prevent said string tip from slipping when being tuned; and in which each of said spools contains a respective guitar string encircled thereon whereby said strings are individually tuned to pitch when said cartridge string housing means is installed onto the sliding key head.
References Cited (Backward Citations)
US2998742A
Cited
US3439570A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-09 | 1978-03-11 | 1978-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-09 | 1982-03-11 | 1982-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-09 | 1986-03-11 | 1986-09-10 | $7700.00 | Window Closed / Lapsed |