US4520709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rimless drum structure with tuning device
Assignee: Individual
•
Filing: 1979-03-19
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Granted: 1985-06-04
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Expires: 1999-03-19
Abstract
Abstract A rimless drum structure in which a drumhead has a membrane attached to an outer ring and an adjustment ring is disposed beneath the membrane within the outer ring. Tuning devices are spaced around the rings and are adjustable to urge the inner ring against the underside of the membrane, and thereby varying the tension and the tuning of the membrane. Two of such drumheads may be assembled in opposing fashion through the use of a plurality of rigid spacer members attached between the brackets of the upper and lower drumheads. An adjustable snare device having a cam type quick release mechanism and a snare tension adjustment device, may be mounted on the dual headed assembly. Sound control devices having bumpers exerting an adjustable amount of force on the upper drumhead membrane may also be used and these devices may be moved to positions at variable distances from the center of the drumhead to vary the sound effect.
Inventors
- 👤 Ralph C. Kester, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:21
CPC Classifications
G; G10; G10D; G10D13/00; G10D13/01; G10D13/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
301 words
A rimless, shell-less dual headed drum structure with tuning means comprising upper and lower drumheads each having a drumhead membrane with an outer rigid ring attached to the periphery thereof, each of said outer rigid rings being generally U-shaped in cross section for receiving therein the edge and a portion of said membrane to which it is attached inwardly from said edge, and having an exposed lip disposed outwardly from said membrane in the tuned drum, a rigid tensioning ring for each of said drumheads being of slightly less external diameter than the internal diameter of said outer rings, each of said tensioning rings being initially positioned within one of said outer rings and moveable through said outer ring and against said membrane, a plurality of spaced attachment and adjustment devices interconnecting said outer and tensioning rings of each of said drumheads, said devices being attached to said lips of said outer rings and having means for adjustably forcing said tensioning rings above said outer rings and against said membranes, a plurality of rigid spacer members between said drumheads, and a snare device disposed on said drumheads and including a sound control adjustment device in contact with the membrane of one of said heads, a plurality of snares stretched across the other of said drumheads, a snare release mechanism and a snare tension adjustment device connected at opposite ends of said snares, said snare release mechanism and said snare tension adjustment device each being attached to one of said rigid spaced members, said snare release mechanism consisting of a shaft fixed to a fixed cam and having mounted thereon a moveable cam operably connected to said snares, wherein movement of said moveable cam causes said moveable cam to ascend and descend on said shaft to make said snares operational or non-operational.
Claim 2
Dependent Claim
301 words
A rimless, shell-less dual headed drum structure with tuning means comprising upper and lower drumheads each having a drumhead membrane with an outer rigid ring attached to the periphery thereof, each of said outer rigid rings being generally U-shaped in cross section for receiving therein the edge and a portion of said membrane to which it is attached inwardly from said edge, and having an exposed lip disposed outwardly from said membrane in the tuned drum, a rigid tensioning ring for each of said drumheads being of slightly less external diameter than the internal diameter of said outer rings, each of said tensioning rings being initially positioned within one of said outer rings and moveable through said outer ring and against said membrane, a plurality of spaced attachment and adjustment devices interconnecting said outer and tensioning rings of each of said drumheads, said devices being attached to said lips of said outer rings and having means for adjustably forcing said tensioning rings above said outer rings and against said membranes, a plurality of rigid spacer members between said drumheads, and a snare device disposed on said drumheads and including a sound control adjustment device in contact with the membrane of one of said heads, a plurality of snares stretched across the other of said drumheads, a snare release mechanism and a snare tension adjustment device connected at opposite ends of said snares, said snare release mechanism and said snare tension adjustment device each being attached to one of said rigid spaced members, said snare release mechanism consisting of a shaft fixed to a fixed cam and having mounted thereon a moveable cam operably connected to said snares, wherein movement of said moveable cam causes said moveable cam to ascend and descend on said shaft to make said snares operational or non-operational.
Claim 3
Dependent Claim
98 words
A rimless, shell-less dual headed drum structure as defined in claim 1 in which each of said attachment and adjustment devices comprises a threaded member extending perpendicularly away from said outer ring, an L-shaped member attached to said tensioning ring and having portions perpendicular and parallel to said tensioning ring, said parallel portion having a hole through which said threaded member slidably passes and a nut adjustable on said threaded member for forcing said parallel portion closer to said outer ring when said nut is turned farther onto said threaded member to increase the tension on said membranes.
Claim 4
Dependent Claim
29 words
A rimless, shell-less dual headed drum structure as defined in claim 2 in which a bracket in releasably attached to said lip and is connected to said threaded member.
Claim 5
Dependent Claim
32 words
A rimless shell-less dual headed drum structure as defined in claim 3 in which a drum carrier and support attachment device is integrally attached to at least one of said tensioning rings.
Claim 6
Dependent Claim
50 words
A rimless shell-less dual headed drum structure as defined in claim 4 in which said carrier and support attachment device comprises a base plate with an outwardly extending tube for the reception of a shaft, and at least one set screw in said tube for securing said shaft in position.
Claim 7
Dependent Claim
32 words
A rimless shell-less dual headed drum structure as defined in claim 2 in which a drum carrier and support attachment device is integrally attached to at least one of said tensioning rings.
Claim 8
Dependent Claim
39 words
A rimless, shell-less dual headed drum structure and tuning device as defined in claim 1 in which said rigid spacer members are secured to said attachment and adjustment devices for retaining said drumheads in spaced relation to each other.
Claim 9
Dependent Claim
40 words
A rimless, shell-less dual headed drum structure as defined in claim 1 in which said snare tension adjustment device includes a housing having a rotatable threaded member disposed therein, and a bar attached to said snares threaded on said member.
Claim 10
Dependent Claim
130 words
In a dual headed drum structure: a snare device assembly comprising a plurality of snares stretched across one of said drumheads, a snare release mechanism including a housing, a vertical shaft and a cam fixed to said housing and a moveable cam on said shaft, a bar connected to said snares slidably mounted on said shaft above said moveable cam and a handle attached to said moveable cam for rotating said moveable cam on said shaft, and a snare tension adjustment device including a housing with slots in the sides thereof, a rotatable threaded member vertically disposed therein, and a bar connected to said snares threaded on said member and extending outwardly into said slots, said release mechanism and said adjustment device being connected at opposite ends of said snares.
Claim 11
Dependent Claim
130 words
In a dual headed drum structure: a snare device assembly comprising a plurality of snares stretched across one of said drumheads, a snare release mechanism including a housing, a vertical shaft and a cam fixed to said housing and a moveable cam on said shaft, a bar connected to said snares slidably mounted on said shaft above said moveable cam and a handle attached to said moveable cam for rotating said moveable cam on said shaft, and a snare tension adjustment device including a housing with slots in the sides thereof, a rotatable threaded member vertically disposed therein, and a bar connected to said snares threaded on said member and extending outwardly into said slots, said release mechanism and said adjustment device being connected at opposite ends of said snares.
Claim 12
Dependent Claim
34 words
In a dual headed drum structure: a snare device assembly as defined in claim 9 in which a sound control adjustment device is in contact with the membrane of the other of said drumheads.
Claim 13
Dependent Claim
294 words
A rimless, shell-less dual headed drum structure with tuning means comprising upper and lower drumheads each having a drumhead membrane with an outer rigid ring attached to the periphery thereof, each of said outer rigid rings being generally U-shaped in cross section for receiving therein the edge of a portion of said membrane to which it is attached inwardly from said edge, and having an exposed lip disposed outwardly from said membrane in the tuned drum, a rigid tensioning ring for each of said drumheads being of slightly less external diameter than the internal diameter of said outer rings, each of said tensioning rings being initially positioned within one of said outer rings and moveable through said outer ring and against said membrane, a plurality of spaced attachment and adjustment devices interconnecting said outer and tensioning rings of each of said drumheads, said devices being attached to said lips of said outer rings and having means for adjustably forcing said tensioning rings above said outer rings and against said membranes, a plurality of rigid spacer members between said drumheads, and a snare device disposed on said drumheads and including a sound control adjustment device in contact with the membrane of one of said heads, a plurality of snares stretched across the other of said drumheads, a snare release mechanism and a snare tension adjustment device connected at opposite ends of said snares, said snare release mechanism and said snare tension adjustment device each being attached to one of said rigid spacer members, said sound control adjustment device including an arm attached to said rigid spacers, a slidably mounted plate having a threaded hole mounted on said arm, a bolt threaded into said hole, and a bumper for contacting said membrane attached to said bolt.
Claim 14
Dependent Claim
294 words
A rimless, shell-less dual headed drum structure with tuning means comprising upper and lower drumheads each having a drumhead membrane with an outer rigid ring attached to the periphery thereof, each of said outer rigid rings being generally U-shaped in cross section for receiving therein the edge of a portion of said membrane to which it is attached inwardly from said edge, and having an exposed lip disposed outwardly from said membrane in the tuned drum, a rigid tensioning ring for each of said drumheads being of slightly less external diameter than the internal diameter of said outer rings, each of said tensioning rings being initially positioned within one of said outer rings and moveable through said outer ring and against said membrane, a plurality of spaced attachment and adjustment devices interconnecting said outer and tensioning rings of each of said drumheads, said devices being attached to said lips of said outer rings and having means for adjustably forcing said tensioning rings above said outer rings and against said membranes, a plurality of rigid spacer members between said drumheads, and a snare device disposed on said drumheads and including a sound control adjustment device in contact with the membrane of one of said heads, a plurality of snares stretched across the other of said drumheads, a snare release mechanism and a snare tension adjustment device connected at opposite ends of said snares, said snare release mechanism and said snare tension adjustment device each being attached to one of said rigid spacer members, said sound control adjustment device including an arm attached to said rigid spacers, a slidably mounted plate having a threaded hole mounted on said arm, a bolt threaded into said hole, and a bumper for contacting said membrane attached to said bolt.
Claim 15
Dependent Claim
98 words
A rimless, shell-less dual headed drum structure as defined in claim 11 in which each of said attachment and adjustment devices comprises a threaded member extending perpendicularly away from said outer ring, and L-shaped member attached to said tensioning ring and having portions perpendicular and parallel to said tensioning ring, said parallel portion having a hole through which said threaded member slidably passes, and a nut adjustable on said threaded member for forcing said parallel portion closer to said outer ring when said nut is turned farther onto said threaded member to increase the tension on said membranes.
Claim 16
Dependent Claim
29 words
A rimless, shell-less dual headed drum structure as defined in claim 12 in which a bracket is releasably attached to said lip and is connected to said threaded member.
Claim 17
Dependent Claim
32 words
A rimless, shell-less dual headed drum structure as defined in claim 13 in which a drum carrier and support attachment device is integrally attached to at least one of said tensioning rings.
Claim 18
Dependent Claim
50 words
A rimless, shell-less dual headed drum structure as defined in claim 14 in which said carrier and support attachment device comprises a base plate with an outwardly extending tube for the reception of a shaft, and at least one set screw in said tube for securing said shaft in position.
Claim 19
Dependent Claim
32 words
A rimless, shell-less dual headed drum structure as defined in claim 12 in which a drum carrier and support attachment device is integrally attached to at least one of said tensioning rings.
Claim 20
Dependent Claim
40 words
A rimless, shell-less dual headed drum structure and tuning device as defined in claim 11 in which said rigid spacer members are secured to said attachment and adjustment devices for retaining said drumheads in in spaced relation to each other.
Claim 21
Dependent Claim
40 words
A rimless, shell-less dual headed drum structure as defined in claim 11 in which said snare tension adjustment device includes a housing having a rotatable threaded member disposed therein, and a bar attached to said snares threaded on said member.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-03 | 1988-12-03 | 1989-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-03 | 1992-12-03 | 1993-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-03 | 1996-12-03 | 1997-06-04 | $7700.00 | Window Closed / Lapsed |