US4293885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pad spring for a tape cassette
Assignee: Olympus Corp
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Filing: 1979-10-16
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Granted: 1981-10-06
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Expires: 1999-10-16
Abstract
Abstract A pad spring for use in a tape cassette is disclosed. The pad spring comprises a bent center section engaged with a pad supporting portion. Free end sections extend from the center section towards both side directions, respectively, are attached to the free end sections, and projections forming a working fulcrum for the pad spring are provided at the rear side of the pad attaching surface of the free end sections, respectively. The bent center section has a narrow portion extending between the pad supporting portion and a fulcrum of the bent center section.
Inventors
- 👤 Hideo Shirako
- 👤 Shoichi Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:47
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087; G11B23/08707; G11B23/08757; G11B23/08771
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
210 words
A pad spring for use in a tape cassette to press a magnetic tape in the cassette against a magnetic head which enters the cassette, the cassette including a pair of fulcrum supporting members, said pad spring comprising a generally U-shaped center portion and a pad supporting portion joined to said center portion at each free end thereof to form a generally elongated spring body, each said pad supporting portion including a substantially flat, free end section fixed to a different one of free ends of said center portion and extending in the long direction of said spring body away from said center portion, a pair of pads each secured to a different one of said free end sections on the surfaces of said free end sections which face toward the magnetic head, and a projection formed on the surface of each of said free end sections which surface faces toward the fulcrum supporting members in the cassette for contacting the fulcrum supporting members to provide a working fulcrum for each of said free end sections when the magnetic head is inserted into the cassette to contact one side of the tape and said pads contact the other side of the tape to press the tape against the magnetic head.
Claim 2
Dependent Claim
210 words
A pad spring for use in a tape cassette to press a magnetic tape in the cassette against a magnetic head which enters the cassette, the cassette including a pair of fulcrum supporting members, said pad spring comprising a generally U-shaped center portion and a pad supporting portion joined to said center portion at each free end thereof to form a generally elongated spring body, each said pad supporting portion including a substantially flat, free end section fixed to a different one of free ends of said center portion and extending in the long direction of said spring body away from said center portion, a pair of pads each secured to a different one of said free end sections on the surfaces of said free end sections which face toward the magnetic head, and a projection formed on the surface of each of said free end sections which surface faces toward the fulcrum supporting members in the cassette for contacting the fulcrum supporting members to provide a working fulcrum for each of said free end sections when the magnetic head is inserted into the cassette to contact one side of the tape and said pads contact the other side of the tape to press the tape against the magnetic head.
Claim 3
Dependent Claim
30 words
A pad spring as claimed in claim 1, wherein each of said free end sections comprises a square frame portion and a narrow free end portion having said pad thereon.
Claim 4
Dependent Claim
24 words
A pad spring as claimed in claim 1, wherein each of said free end sections comprises a square frame portion having said pad thereon.
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) | 1984-10-05 | 1985-04-06 | 1985-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-05 | 1989-04-06 | 1989-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-05 | 1993-04-06 | 1993-10-06 | $7700.00 | Window Closed / Lapsed |