US3724771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hub-platform assembly and loop-sizing method
Assignee: Marantz Co Inc
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Filing: 1971-03-12
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Granted: 1973-04-03
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Expires: 1991-03-12
Abstract
Abstract A hub-platform assembly for a continuous loop magnetic tape cartridge in which the hub is mounted on the platform for indexing between angularly spaced winding and stripping positions and for axial movement through a preselected movement as a result of said indexing, initially being held releasably in the winding position for loading with a tape pancake which is wound around a conical surface tapering toward the platform. When the hub is indexed to the stripping position, the conical surface is shifted axially to move the larger section thereof, which determined the inside diameter of the pancake, out of the pancake, thereby forming a gap between the hub and the inside diameter permitting the tape to be wound down around the hub by pulling the opposite ends of the tape away from the pancake. The gap size is calculated to produce a loop of predetermined length as this is done.
Inventors
- 👤 D Zielke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:31
CPC Classifications
B; B65; B65H; B65H20/00; B65H20/26; G; G11; G11B; G11B15/00; G11B15/60
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
279 words
A hub-platform assembly for a continuous loop tape cartridge having, in combination: a platform in the form of a disk having a center hole; a hub having a cylindrical base end portion composed of resiliently flexible material and fitted rotatably in said center hole, a frustro-conical winding surface tapering toward said base end portion, and an annular shoulder extending from the smaller end of said winding surface to said base end portion, said shoulder being positioned to engage one side of said platform and locate the hub in a winding position; a first set of angularly spaced slots in said base end portion adjacent said shoulder; a set of angularly spaced fingers on said platform projecting into said center hole and fitting into said slots to retain said hub releasably in said winding position; a second set of angularly spaced slots in said base end portion, the slots of said second set being spaced axially from said first set, away from said shoulder, and alternating angularly with the slots of the first set whereby one slot of said second set is disposed angularly between each pair of slots of the first set; and a set of angularly spaced cams formed on said base section, each cam being positioned between a slot of the first set and a slot of the second set and having an inclines ramp for guiding one of said fingers between the associated slots, whereby the hub is shifted axially relative to the platform from said winding position to a stripping position as it is turned to shift the fingers from the first set of slots, along said ramps and into the second set of slots.
Claim 2
Dependent Claim
279 words
A hub-platform assembly for a continuous loop tape cartridge having, in combination: a platform in the form of a disk having a center hole; a hub having a cylindrical base end portion composed of resiliently flexible material and fitted rotatably in said center hole, a frustro-conical winding surface tapering toward said base end portion, and an annular shoulder extending from the smaller end of said winding surface to said base end portion, said shoulder being positioned to engage one side of said platform and locate the hub in a winding position; a first set of angularly spaced slots in said base end portion adjacent said shoulder; a set of angularly spaced fingers on said platform projecting into said center hole and fitting into said slots to retain said hub releasably in said winding position; a second set of angularly spaced slots in said base end portion, the slots of said second set being spaced axially from said first set, away from said shoulder, and alternating angularly with the slots of the first set whereby one slot of said second set is disposed angularly between each pair of slots of the first set; and a set of angularly spaced cams formed on said base section, each cam being positioned between a slot of the first set and a slot of the second set and having an inclines ramp for guiding one of said fingers between the associated slots, whereby the hub is shifted axially relative to the platform from said winding position to a stripping position as it is turned to shift the fingers from the first set of slots, along said ramps and into the second set of slots.
Claim 3
Dependent Claim
32 words
A hub-platform assembly as defined in claim 1 further including means for guiding said fingers into said first set of slots as said base end portion is pressed into said center hole.
Claim 4
Dependent Claim
35 words
A hub-platform assembly as defined in claim 1 further including cooperating cam surfaces on said first set of slots and said fingers for camming the fingers out of the slots as the hub is turned.
Claim 5
Dependent Claim
27 words
A hub-platform assembly as defined in claim 1 in which said hub is composed of resiliently flexible plastic and said platform is composed of more rigid plastic.
Claim 6
Dependent Claim
255 words
A hub-platform assembly for use in winding a length of tape into an annular pancake and supporting the pAncake as the opposite end portions of the tape are pulled thereform to form a loop, comprising: a platform in the form of a disk having an annular side for engaging one side of the pancake, and having a center hole encircled by said annular side; a hub having one end portion fitted rotatably in said center hole and an opposite end portion projecting outwardly from said platform; said hub having a conical peripheral surface tapering toward said platform, whereby the tape may be wound about the hub with one edge of the tape engaging said platform and the opposite edge portion positioned during winding by a first section of said conical surface spaced axially from said platform a preselected distance equal to the width of the tape; means holding said hub releasably in a winding position on said platform with said first section spaced said preselected distance from the platform; means responsive to rotation of said hub relative to said platform to shift the hub axially relative to the platform and move said first section away from the platform, thereby moving a second smaller section of said conical surface into the position originally occupied by said first section and leaving a gap between the conical surface and the tape pancake; and means responsive to a preselected amount of movement of the hub relative to the platform to secure the hub to the platform against further movement.
Claim 7
Dependent Claim
255 words
A hub-platform assembly for use in winding a length of tape into an annular pancake and supporting the pAncake as the opposite end portions of the tape are pulled thereform to form a loop, comprising: a platform in the form of a disk having an annular side for engaging one side of the pancake, and having a center hole encircled by said annular side; a hub having one end portion fitted rotatably in said center hole and an opposite end portion projecting outwardly from said platform; said hub having a conical peripheral surface tapering toward said platform, whereby the tape may be wound about the hub with one edge of the tape engaging said platform and the opposite edge portion positioned during winding by a first section of said conical surface spaced axially from said platform a preselected distance equal to the width of the tape; means holding said hub releasably in a winding position on said platform with said first section spaced said preselected distance from the platform; means responsive to rotation of said hub relative to said platform to shift the hub axially relative to the platform and move said first section away from the platform, thereby moving a second smaller section of said conical surface into the position originally occupied by said first section and leaving a gap between the conical surface and the tape pancake; and means responsive to a preselected amount of movement of the hub relative to the platform to secure the hub to the platform against further movement.
Claim 8
Dependent Claim
45 words
A hub-platform assembly as defined in claim 5 in which said holding means comprise a first set of recesses angularly spaced around said one end portion of said hub, and a set of fingers on said platform extending inwardly and releasably received in said recesses.
Claim 9
Dependent Claim
39 words
A hub-platform assembly as defined in claim 6 in which said fingers and said recesses have cooperating cam surfaces for shifting the fingers out of the recesses as the hub is turned in one direction relative to the platform.
Claim 10
Dependent Claim
58 words
A hub-platform assembly as defined in claim 6 in which said means responsive to rotation of said hub to shift the hub axially comprise cams on said one end portion having ramps along which said fingers slide, said ramps being inclined across the paths of said fingers during rotation to shift the fingers axially relative to the hub.
Claim 11
Dependent Claim
59 words
A hub-platform assembly as defined in claim 7 in which said means responsive to a preselected amount of movement of the hub comprise a second set of recesses spaced angularly and axially from said first set of recesses, at the ends of said ramps, to receive the fingers and secure the hub and the platform in said stripping position.
Claim 12
Dependent Claim
38 words
A hub-platform assembly as defined in claim 7 in which said hub has an annular shoulder facing away from said conical surface between the latter and said first set of slots for guiding said fingers to said ramps.
Claim 13
Dependent Claim
162 words
A hub-platform assembly for use in winding a length of tape into an annular pancake and thereafter supporting the pancake, comprising: a disk-like platform for engaging one side of the pancake; a hub centrally mounted on said platform in a winding position and projecting away from said platform, said hub having a peripheral surface about which the tape is to be wound and having two axially spaced sections of different sizes, the larger of said sizes being spaced from said platform to engage the tape adjacent the side of the pancake remote from the platform, and the smaller of said sizes being disposed between said larger size and said platform; and means mounting said hub on said platform for selective axial movement relative thereto from said winding position to a stripping position in which said larger section is spaced from said platform a distance greater than the width of said tape, thereby to form a gap between said annulus and said hub.
Claim 14
Dependent Claim
162 words
A hub-platform assembly for use in winding a length of tape into an annular pancake and thereafter supporting the pancake, comprising: a disk-like platform for engaging one side of the pancake; a hub centrally mounted on said platform in a winding position and projecting away from said platform, said hub having a peripheral surface about which the tape is to be wound and having two axially spaced sections of different sizes, the larger of said sizes being spaced from said platform to engage the tape adjacent the side of the pancake remote from the platform, and the smaller of said sizes being disposed between said larger size and said platform; and means mounting said hub on said platform for selective axial movement relative thereto from said winding position to a stripping position in which said larger section is spaced from said platform a distance greater than the width of said tape, thereby to form a gap between said annulus and said hub.
Claim 15
Dependent Claim
241 words
A hub-platform assembly for use in winding a length of tape into an annular pancake and thereafter supporting the pancake, comprising: a hub having an outside surface about which the tape is to be wound; a platform disPosed adjacent one end of said hub and projecting radially outwardly therefrom to form a peripheral flange about the hub for engaging one edge of the tape as the latter is wound about said hub and one side of the pancake after it is wound about the hub; and means mounting said hub on said platform for selective axial movement relative thereto from a winding position to a stripping position; said outside surface of said hub having a first section of preselected diameter in a selected position for engagement with said tape as the latter is wound on said assembly with the hub in said winding position, thereby to form the inner side of said annulus to said preselected diameter, and having a second section of smaller diameter than said first section and axially spaced therefrom, said first section being movable out of the annulus as the hub is moved from said winding position to said stripping position, and said second section being movable into a position to engage the inner side of said annulus as the hub is moved to said stripping position, thereby to form a gap of selected thickness between said hub and the annulus as an incident to such movement.
Claim 16
Dependent Claim
241 words
A hub-platform assembly for use in winding a length of tape into an annular pancake and thereafter supporting the pancake, comprising: a hub having an outside surface about which the tape is to be wound; a platform disPosed adjacent one end of said hub and projecting radially outwardly therefrom to form a peripheral flange about the hub for engaging one edge of the tape as the latter is wound about said hub and one side of the pancake after it is wound about the hub; and means mounting said hub on said platform for selective axial movement relative thereto from a winding position to a stripping position; said outside surface of said hub having a first section of preselected diameter in a selected position for engagement with said tape as the latter is wound on said assembly with the hub in said winding position, thereby to form the inner side of said annulus to said preselected diameter, and having a second section of smaller diameter than said first section and axially spaced therefrom, said first section being movable out of the annulus as the hub is moved from said winding position to said stripping position, and said second section being movable into a position to engage the inner side of said annulus as the hub is moved to said stripping position, thereby to form a gap of selected thickness between said hub and the annulus as an incident to such movement.
Claim 17
Dependent Claim
35 words
A hub-platform assembly as defined in claim 12 in which said platform is a disk having a center hole, and said hub has a base end fitted into said center hole and movably secured therein.
Claim 18
Dependent Claim
30 words
A hub-platform assembly as defined in claim 13 in which said outside surface is frustro-conical and tapers toward said platform, said sections being axially spaced portions of said outside surface.
Claim 19
Dependent Claim
45 words
A hub-platform assembly as defined in claim 13 in which said mounting means include two axially spaced sets of detents and coacting fingers acting between said hub and said platform to hold the latter releasably in said winding position and subsequently in said stripping position.
Claim 20
Dependent Claim
62 words
A hub-platform assembly as defined in claim 15 in which said detents are two sets of slots formed in said base end, the slots of one set being axially spaced from the slots of the other set, and said fingers being mounted on said platform to project inwardly into said center hole for selective engagement with the slots of the two sets.
Claim 21
Dependent Claim
38 words
A hub-platform assembly as defined in claim 16 in which said mounting means also include cam elements for shifting said fingers from one set of slots to the other as said hub is turned relative to said platform.
Claim 22
Dependent Claim
46 words
A hub-platform assembly as defined in claim 17 in which said cam elements comprise inclined edges on said fingers for camming the fingers out of one set of slots, and ramps on said base end for guiding the fingers axially into the other set of slots.
Claim 23
Independent Claim
167 words
The method of winding a length of tape into a pancake around a hub mounted on a platform and formed with axially spaced winding surfaces of different sizes, and forming a loop with the opposite end portions of the tape, said method comprising the steps of: winding the tape around the hub and against the platform with the hub positioned on the platform in a winding position in which the larger of the winding surfaces is located to determine the initial inside diameter of the pancake; shifting the hub relative to the platform into a stripping position in which the smaller of the winding surfaces is located to determine the inside deameter of the pancake, and thereby forming an annular gap between the hub and the pancake; winding the tape down about the smaller winding surface as permitted by the gap, while pulling tape from the inner side of the pancake, through the gap; and joining the opposite ends of the tape together to form a loop.
Claim 24
Independent Claim
167 words
The method of winding a length of tape into a pancake around a hub mounted on a platform and formed with axially spaced winding surfaces of different sizes, and forming a loop with the opposite end portions of the tape, said method comprising the steps of: winding the tape around the hub and against the platform with the hub positioned on the platform in a winding position in which the larger of the winding surfaces is located to determine the initial inside diameter of the pancake; shifting the hub relative to the platform into a stripping position in which the smaller of the winding surfaces is located to determine the inside deameter of the pancake, and thereby forming an annular gap between the hub and the pancake; winding the tape down about the smaller winding surface as permitted by the gap, while pulling tape from the inner side of the pancake, through the gap; and joining the opposite ends of the tape together to form a loop.
Claim 25
Dependent Claim
34 words
The method defined in claim 19 in which the winding step is performed by pulling both ends of the tape away from the pancake until the latter winds down around the smaller winding surface.
Claim 26
Dependent Claim
65 words
The method as defined in claim 19 in which the hub has a conical winding surface, and said larger and smaller surfaces are axially spaced sections of said conical surface, said Shifting step being performed by moving the hub axially relative to the platform to move the conical surface axially away from the platform a preselected increment to produce a gap of preselected radial width.
Claim 27
Dependent Claim
44 words
The method as defined in claim 19 including the step of initially sizing said pancake, said gap and said winding surfaces relative to each other to produce a loop of predetermined size when said pancake has been wound down against the smaller winding surface.
Claim 28
Independent Claim
140 words
The method of winding a length of tape into a pancake around a hub mounted on a platform and having an outwardly facing winding surface capable of being changed from a preselected first effective size to a smaller, second effective size, and forming a loop with the opposite end portions of the tape, said method comprising the steps of: winding the tape into the pancake around the hub while the winding surface has said preselected first effective size; changing the winding surface to aid smaller, second effective size, and thereby forming an annular gap between the hub and the pancake; winding the tape down about the winding surface to said smaller, second effective size while pulling tape from the inner side of the pancake through the gap; and joining the opposite ends of the tape together to form the loop.
Claim 29
Independent Claim
140 words
The method of winding a length of tape into a pancake around a hub mounted on a platform and having an outwardly facing winding surface capable of being changed from a preselected first effective size to a smaller, second effective size, and forming a loop with the opposite end portions of the tape, said method comprising the steps of: winding the tape into the pancake around the hub while the winding surface has said preselected first effective size; changing the winding surface to aid smaller, second effective size, and thereby forming an annular gap between the hub and the pancake; winding the tape down about the winding surface to said smaller, second effective size while pulling tape from the inner side of the pancake through the gap; and joining the opposite ends of the tape together to form the loop.
References Cited (Backward Citations)
US3350028A
Cited
AT290879B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |