US3796387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hub-platform assembly for continuous-loop tapes
Assignee: Marantz Co Inc
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Filing: 1973-04-02
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Granted: 1974-03-12
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Expires: 1993-04-02
Abstract
Abstract A hub-platform assembly for a continuous loop magnetic tape cartridge in which the hub is rotatably mounted in a center hole in the platform, and the platform includes a set of angularly spaced bayonet pins projecting into the hole to enter a corresponding set of generally T-shaped slots in the hub, the slots having axially sloping walls to impart an axial displacement to the hub in response to a rotational movement relative to the platform. Detent buttons hold the pins releasably in the central portion of the slot, and additional detent buttons hold the pins releasably at either of the slot extremities, so that the hub may be positioned selectively in either a neutral position, a winding position in which a length of tape is wound in a roll about a conical surface of the hub, or a stripping position in which the hub is displaced axially from the winding position and the conical surface presents a smaller diameter to the roll of tape, facilitating stripping of tape from the inside of the roll and joining it to the outside end of the tape to form a continuous loop.
Inventors
- 👤 D Zielke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:52
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/037
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
256 words
A hub-platform assembly for a continuous loop tape cartridge, comprising: a platform in the form of a disk having a center hole; a hub having a cylindrical base portion composed of resiliently flexible material and fitted rotatably in said center hole, a frusto-conical winding surface tapering toward said base portion, and an annular shoulder joining the smaller end of said winding surface with said base portion, said shoulder being positioned to engage one side of said platform and locate said hub in a winding position; a set of angularly spaced pins integral with said platform and projecting into said center hole; a set of generaLly T-shaped slots angularly spaced around said cylindrical base portion to receive said pins, each of said slots having a central passage for receiving one of said pins as said hub is fitted to said center hole, a first transverse passage extending generally at a right angle in one circumferential direction from said central passage, and a second transverse passage extending generally at a right angle in the opposite circumferential direction from said central passage, said second transverse passage being a predetermined axial distance further from said shoulder than said first transverse passage, whereby rotation of said hub with respect to said platform moves said pins from said first transverse passage to said second transverse passage and thereby moves said hub axially outward from said platform through the predetermined distance from the winding position to a stripping position; and detent means for holding said pins releasably in selected positions in said slots.
Claim 2
Dependent Claim
256 words
A hub-platform assembly for a continuous loop tape cartridge, comprising: a platform in the form of a disk having a center hole; a hub having a cylindrical base portion composed of resiliently flexible material and fitted rotatably in said center hole, a frusto-conical winding surface tapering toward said base portion, and an annular shoulder joining the smaller end of said winding surface with said base portion, said shoulder being positioned to engage one side of said platform and locate said hub in a winding position; a set of angularly spaced pins integral with said platform and projecting into said center hole; a set of generaLly T-shaped slots angularly spaced around said cylindrical base portion to receive said pins, each of said slots having a central passage for receiving one of said pins as said hub is fitted to said center hole, a first transverse passage extending generally at a right angle in one circumferential direction from said central passage, and a second transverse passage extending generally at a right angle in the opposite circumferential direction from said central passage, said second transverse passage being a predetermined axial distance further from said shoulder than said first transverse passage, whereby rotation of said hub with respect to said platform moves said pins from said first transverse passage to said second transverse passage and thereby moves said hub axially outward from said platform through the predetermined distance from the winding position to a stripping position; and detent means for holding said pins releasably in selected positions in said slots.
Claim 3
Dependent Claim
42 words
A hub-platform assembly as set forth in claim 1, wherein said detent means include a pair of detent buttons integral with said base portion on opposite sides of said central passage, for preventing inadvertent removal of said hub from said central hole.
Claim 4
Dependent Claim
64 words
A hub-platform assembly as set forth in claim 2, wherein said detent means also include: second detent buttons integral with said base portion in said first transverse passage, for preventing inadvertent movement of said hub from the winding position; and third detent buttons integral with said base portion in said second transverse passage, for preventing inadvertent movement of said hub from the stripping position.
Claim 5
Dependent Claim
47 words
A hub-platform assembly as set forth in claim 3, wherein each of said slots is defined in part by an axially sloping transitional surface joining said first and second transverse passages to guide said pins between said transverse passages and to coact with said pins as cams.
Claim 6
Dependent Claim
47 words
A hub-platform assembly as set forth in claim 1, wherein each of said slots is defined in part by an axially sloping transitional surface joining said first and second transverse passages to guide said pins between said transverse passages and to coact with said pins as cams.
Claim 7
Dependent Claim
21 words
A hub-platform assembly as set forth in claim 1, wherein said platform is symmetrical about a plane normal to its axis.
Claim 8
Dependent Claim
253 words
A hub-platform assembly for use in winding and thereafter supporting a continuous loop of tape in an annular roll, comprising: a platform in the form of a disk having a center hole surrounded by a flat annular portion for supporting the tape roll; a hub having a generally cylindrical base portion fitted rotatably in said center hole and an opposite end portion projecting outwardly from said platform, said opposite end portion including a conical peripheral winding surface tapering toward said platform, whereby a predetermined axial movement of said hub outward from said platform correspondingly reduces the effective diameter of said winding surface to facilitate joining the opposite ends of the tape to form the continuous loop; a set of angularly spaced pins on said platform projecting into said center hole; a set of generally T-shaped slots angularly spaced around said cylindrical base portion to receive said pins, each of said slots having a transverse passage with opposite extremities displaced axially by a predetermined distance, and an entrance passage intersecting said transverse passage to guide a corresponding one of said pins into said transverse passage as said hub is fitted into said center hole, whereby a rotational movement of said hub with respect to said platform moves said bayonet pins along said transverse recesses and imparts the predetermined axial movement to said hub; and means for holding said hub in one angular position relative to said platform for winding of the tape roll thereon, and in another angular position for formation of the loop.
Claim 9
Dependent Claim
253 words
A hub-platform assembly for use in winding and thereafter supporting a continuous loop of tape in an annular roll, comprising: a platform in the form of a disk having a center hole surrounded by a flat annular portion for supporting the tape roll; a hub having a generally cylindrical base portion fitted rotatably in said center hole and an opposite end portion projecting outwardly from said platform, said opposite end portion including a conical peripheral winding surface tapering toward said platform, whereby a predetermined axial movement of said hub outward from said platform correspondingly reduces the effective diameter of said winding surface to facilitate joining the opposite ends of the tape to form the continuous loop; a set of angularly spaced pins on said platform projecting into said center hole; a set of generally T-shaped slots angularly spaced around said cylindrical base portion to receive said pins, each of said slots having a transverse passage with opposite extremities displaced axially by a predetermined distance, and an entrance passage intersecting said transverse passage to guide a corresponding one of said pins into said transverse passage as said hub is fitted into said center hole, whereby a rotational movement of said hub with respect to said platform moves said bayonet pins along said transverse recesses and imparts the predetermined axial movement to said hub; and means for holding said hub in one angular position relative to said platform for winding of the tape roll thereon, and in another angular position for formation of the loop.
Claim 10
Dependent Claim
39 words
A hub-platform assEmbly as set forth in claim 7, wherein each of said entrance passages has at least one detent therein, for admitting said pins into said slots and thereafter preventing inadvertent disassembly of said hub from said platform.
Claim 11
Dependent Claim
39 words
A hub-platform assembly as set forth in claim 7, wherein said holding means comprise detents for admitting said pins into said transverse passages and thereafter preventing inadvertent movement of said bayonet pins from the extremities of said transverse passages.
Claim 12
Dependent Claim
21 words
A hub-platform assembly as set forth in claim 7, wherein said platform is symmetrical about a plane normal to its axis.
Claim 13
Dependent Claim
202 words
A hub-platform assembly for use in winding and supporting thereon a length of tape in an annular roll and joining the opposite ends of the tape to form a loop, comprising: a platform member in the form of a disk having a center hole surrounded by a flat annular portion for supporting the tape roll; a hub member having a generally cylindrical base portion fitted rotatably in said center hole and an opposite end portion projecting outwardly from said platform, said opposite end portion having a first winding surface of a preselected diameter spaced a selected distance from said platform, and having a second winding surface of a lesser diameter closer to said platform, whereby a predetermined axial movement of said hub outward from said platform correspondingly reduces the effective diameter of said hub presented to the tape roll to facilitate joining the opposite ends of the tape; a set of angularly spaced projections on one of said members; and a set of angularly spaced, generally T-shaped slots in the other of said members positioned to receive said pins, said slots having sloping portions for imparting an axial displacement to said hub relative to said platform in response to a rotational displacement.
Claim 14
Dependent Claim
202 words
A hub-platform assembly for use in winding and supporting thereon a length of tape in an annular roll and joining the opposite ends of the tape to form a loop, comprising: a platform member in the form of a disk having a center hole surrounded by a flat annular portion for supporting the tape roll; a hub member having a generally cylindrical base portion fitted rotatably in said center hole and an opposite end portion projecting outwardly from said platform, said opposite end portion having a first winding surface of a preselected diameter spaced a selected distance from said platform, and having a second winding surface of a lesser diameter closer to said platform, whereby a predetermined axial movement of said hub outward from said platform correspondingly reduces the effective diameter of said hub presented to the tape roll to facilitate joining the opposite ends of the tape; a set of angularly spaced projections on one of said members; and a set of angularly spaced, generally T-shaped slots in the other of said members positioned to receive said pins, said slots having sloping portions for imparting an axial displacement to said hub relative to said platform in response to a rotational displacement.
Claim 15
Dependent Claim
30 words
A hub-platform assembly as set forth in claim 11, further comprising: detent means for retaining said pins in said slots to prevent inadvertent disassembly of said hub and said platform.
Claim 16
Dependent Claim
41 words
A hub-platform assembly as set forth in claim 12, further comprising: second and third detent means for retaining said pins at the extremities of said slots to prevent inadvertent movement from a selected position of said hub relative to said platform.
Claim 17
Dependent Claim
21 words
A hub-platform assembly as set forth in claim 11, wherein said platform is symmetrical about a plane normal to its axis.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-11 | 1977-09-10 | 1978-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-11 | 1981-09-10 | 1982-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-11 | 1985-09-10 | 1986-03-12 | $7700.00 | Window Closed / Lapsed |