EP0272556A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Flat spring structure for magnetic tape cassettes, in particular video cassettes
Assignee: Koller Group Inc A Delaware Corp Te Mi
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Filing: 1987-12-11
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Granted: —
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Expires: 2007-12-11
Abstract
Abstract A flat spring structure for magnetic tape cassettes, in particular video cassettes, which comprises an elastic lamina (1) of elongate conformation which is coupleable at a middle portion thereof with the cover (5) of a cassette and which acts, proximate to its free end (2) on the central pivot (6) of the reels (7) supporting a magnetic tape. The peculiarity of the invention is constituted by the fact that the lamina (1) at the side thereof facing the reels (7), has a concave piecewise conformation with at least one fold line (10) in the portion defined between the free end and the zone of coupling with the cover (5). The fold line (10), with the lamina (1) inserted into the cassette, engages by contact with the cover (5) to define a fulcrum point for elastic oscillation of said lamina (1).
Inventors
- 👤 Abramo Bordignon
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 11:04
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08728
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
148 words
Flat spring structure for magnetic tape cassettes, in particular video cassettes, comprising an elastic lamina (1) with an elongated configuration which is coupleable, at a middle portion thereof, with the cover (5) of a cassette and acting, proximate to its free ends (2), on the central pivot (6) of the reels (7) supporting the magnetic tape, characterized in that it comprises, on the side facing towards said reels (7), the configuration of a concave piecewise line with at least one fold line (10), with said elastic lamina (1) inserted in said cassette, being adapted to engage by contact with said cover (5) to define at least one fulcrum point for elastic oscillation of said lamina (1), said fulcrum point having a distance from said pivot (6) of the reel (7) which is smaller than the distance between said pivot (6) and said zone of coupling with the cover(5).
Claim 2
Dependent Claim
148 words
Flat spring structure for magnetic tape cassettes, in particular video cassettes, comprising an elastic lamina (1) with an elongated configuration which is coupleable, at a middle portion thereof, with the cover (5) of a cassette and acting, proximate to its free ends (2), on the central pivot (6) of the reels (7) supporting the magnetic tape, characterized in that it comprises, on the side facing towards said reels (7), the configuration of a concave piecewise line with at least one fold line (10), with said elastic lamina (1) inserted in said cassette, being adapted to engage by contact with said cover (5) to define at least one fulcrum point for elastic oscillation of said lamina (1), said fulcrum point having a distance from said pivot (6) of the reel (7) which is smaller than the distance between said pivot (6) and said zone of coupling with the cover(5).
Claim 3
Dependent Claim
25 words
Flat spring structure, according to the preceding claim, characterized in that said flat spring (1) has a substantially constant width for its entire longitudinal extension.
Claim 4
Dependent Claim
63 words
Flat spring structure according to the preceding claims, characterized in that the portion of said lamina (1) defined between said fold line (10) and said zone of coupling with the cover (5) is between 35 and 65% of the portion of said lamina (1) defined between said zone of coupling with the cover (5) and the point of engagement with said pivot (6).
Claim 5
Dependent Claim
40 words
Flat spring structure, according to the preceding claims, characterized in that said fold line (10) is arranged substantially at half the distance between the zone of coupling with said cover (5) and the point of contact with said pivot (6).
Claim 6
Dependent Claim
33 words
Flat spring structure, according to one or more of the preceding claims, characterized in that it comprises an initial fold (20) arranged substantially proximate to said zone of coupling with the cover (5).
Claim 7
Dependent Claim
38 words
Flat spring structure, according to one or more of the preceding claims, characterized in that said initial fold (20) is arranged substantially at one sixth of the cover (5) and the point of engagement with said pivot (6).
Claim 8
Dependent Claim
41 words
Flat spring structure, according to one or more of the preceding claims, characterized in that at said zone of coupling with the cover (5), it exerts on said cover a force directed from the outside towards the inside of said cassette.
Claim 9
Dependent Claim
95 words
Flat spring structure for magnetic tape cassettes, in particular video cassettes, comprising an elastic lamina (100) with an elongated configuration which is coupleable, at a middle portion thereof, with the cover (106) of a cassette and acting, proximate to its free ends (102), on the central pivot (103) of the reels (104) supporting the magnetic tape, characterized in that it comprises at least one stiffening ridge (110) extending along said elastic lamina (100) for at lest one longitudinal portion in the region in which the greatest moment of flexure of the lamina (100) is exerted.
Claim 10
Dependent Claim
95 words
Flat spring structure for magnetic tape cassettes, in particular video cassettes, comprising an elastic lamina (100) with an elongated configuration which is coupleable, at a middle portion thereof, with the cover (106) of a cassette and acting, proximate to its free ends (102), on the central pivot (103) of the reels (104) supporting the magnetic tape, characterized in that it comprises at least one stiffening ridge (110) extending along said elastic lamina (100) for at lest one longitudinal portion in the region in which the greatest moment of flexure of the lamina (100) is exerted.
Claim 11
Dependent Claim
34 words
Flat spring structure, according to the preceding claim, characterized in that said ridge (110) has a width which decreases starting from said zone of coupling with the cover (106) towards the free end (102).
Claim 12
Dependent Claim
26 words
Flat spring structure, according to one or more of the preceding claims, characterized in that said ridge (110) is obtained by plastic deformation of the material.
Claim 13
Dependent Claim
107 words
Flat spring structure, according to one or more of the preceding claims characterized in that it comprises at least one fold line (120) affected by said ridge (110) and provided at the portion comprised between the free end (102) and said zone of coupling with the cover (106), said fold line (120), with said elastic lamina (100) inserted in said cassette, being adapted to engage by contact with said oscillation of said lamina (100), said fulcrum point having a distance from said pivot (103) of the reel (104) which is smaller than the distance between said pivot (103) and said zone of coupling with the cover (106).
Claim 14
Dependent Claim
55 words
Flat spring structure, according to one or more of the preceding claims, characterized in that said at least one fold line (120) of said lamina (100) with the ridge (110) is defined substantially at half the distance provided between said zone of coupling with the cover (106) and said pivot (103) of the reel (104).
Claim 15
Dependent Claim
29 words
Flat spring structure, according to the preceding claims, characterized in that said elastic lamina (100) with the ridge (110) has a substantially constant width for its entire longitudinal extension.
Claim 16
Dependent Claim
39 words
Flat spring structure, according to one or more of the preceding claims, characterized in that said elastic lamina (100) with the ridge (110) has the shape of a piecewise line concave on the side facing towards said reels (104).
References Cited (Backward Citations)
No citation records indexed.
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