US4619420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tape cassette
Assignee: Emtec Magnetics GmbH
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Filing: 1985-06-13
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Granted: 1986-10-28
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Expires: 2005-06-13
Abstract
Abstract A pressure spring for reels in tape cassettes, for example video cassettes, possesses fastening means which are arranged in the area of a depression in the particular reel to which pressure is to be applied. In practice, the pressure spring is designed for a two-reel cassette and is in the form of a two-armed spring having fastening arms roughly parallel to these arms.
Inventors
- 👤 Klaus Schoettle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:31
CPC Classifications
G; G11; G11B; G11B23/00; G11B23/02; G11B23/04; G11B23/08; G11B23/087
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
114 words
A tape cassette comprising a housing having a housing part, at least one flanged tape reel and a pressure spring having at least one fastening arm fastening the pressure spring to the said housing part and at least one pressure spring arm for exerting a spring force on the tape reel(s) in the direction of a defined operating position, said at least one tape reel having a depression in the flange facing the said housing part and an end region of the at least one fastening arm possessing fastening means for fastening the pressure spring to the said housing part in an area facing the depression provided in the at least one tape reel.
Claim 2
Dependent Claim
114 words
A tape cassette comprising a housing having a housing part, at least one flanged tape reel and a pressure spring having at least one fastening arm fastening the pressure spring to the said housing part and at least one pressure spring arm for exerting a spring force on the tape reel(s) in the direction of a defined operating position, said at least one tape reel having a depression in the flange facing the said housing part and an end region of the at least one fastening arm possessing fastening means for fastening the pressure spring to the said housing part in an area facing the depression provided in the at least one tape reel.
Claim 3
Dependent Claim
26 words
A tape cassette according to claim 1, wherein two tape reels are provided and the pressure spring has two fastening arms and two pressure spring arms.
Claim 4
Dependent Claim
60 words
A tape cassette as claimed in claim 1 wherein the fastening means of the or each fastening arm is arranged to face a depression in the reel flange which is determined by a circular ring area having a diameter smaller than half the spring arm length and having its center on the end of the pressure spring arm allocated thereto.
Claim 5
Dependent Claim
20 words
A tape cassette as claimed in claim 3, wherein the diameter is approximately one quarter of the spring arm length.
Claim 6
Dependent Claim
49 words
A tape cassette as claimed in claim 2, wherein the fastening arms extend at least substantially parallel to the pressure spring arms in the form of double arms and wherein the pressure spring has a middle section at which the fastening arms and the spring arms are connected together.
Claim 7
Dependent Claim
53 words
A pressure spring for use in a tape cassette as claimed in claim 1, wherein the fastening means are arranged on the fastening arms within a circular ring area whose diameter is smaller than half the spring arm length and whose center is on the end of the pressure spring arm allocated thereto.
Claim 8
Dependent Claim
27 words
A pressure spring as claimed in claim 6, wherein the diameter (d) of the circular ring area is about one fourth of the spring arm length (1/4).
Claim 9
Dependent Claim
52 words
A pressure spring as claimed in claim 6, wherein the fastening arms (4, 5) extend substantially parallel to the pressure spring arms (2, 3) in the form of double arms, and wherein the pressure spring has a middle section (20) at which the fastening arms and the spring arms are connected together.
Claim 10
Dependent Claim
18 words
A pressure spring as claimed in claim 8, wherein the spring arms are integral with the fastening arms.
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) | 1989-10-27 | 1990-04-28 | 1990-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-27 | 1994-04-28 | 1994-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-27 | 1998-04-28 | 1998-10-28 | $7700.00 | Window Closed / Lapsed |