US4348786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opening and closing apparatus
Assignee: Ricoh Co Ltd
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Filing: 1979-09-28
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Granted: 1982-09-14
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Expires: 1999-09-28
Abstract
Abstract An opening and closing apparatus comprises a swingable member, spring means and resilient restoring force transmission means for transmitting the resilient restoring force of the spring. The swingable member is supported pivotally by the support means so as to be opened and closed with respect to a base frame of the swingable member, and one end of the spring means is fixed to a support portion on which one end portion of the swingable member is pivotally supported, and the other end of the spring means can be twisted forcibly in the closing direction of the swingable member. The resilient restoring force of the twisted end of the spring means is transmitted to or near the line of the center of the gravity of the swingable member, so that the opening and closing operation of the swingable member can be performed safely and smoothly.
Inventors
- 👤 Akira Hirose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:56
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/60; G03G15/605; E; E05; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/123; E05Y; E05Y2999/00; Y; Y10; Y10S; Y10S16/00; Y10S16/36
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
An opening and closing apparatus for opening and closing a swingable member, comprising: a swingable member which is to be opened and closed with respect to a base member thereof, support means for supporting pivotally one end portion of said swingable member in a manner that said swingable member can be opened and closed with respect to said base member, spring means having one end fixed to a portion for supporting said swingable member pivotally, said spring means being adapted to be twisted forcibly in the closing direction of said swingable member, and transmission means for transmitting the resilient restoring force generated when said spring means is twisted in the closing direction of said swingable member to said swingable member during opening of said swingable member from its closed position, said transmission means being connected to said swingable member through a single arm extending in the vertical plane containing the center of gravity of said swingable member.
Claim 2
Dependent Claim
157 words
An opening and closing apparatus for opening and closing a swingable member, comprising: a swingable member which is to be opened and closed with respect to a base member thereof, support means for supporting pivotally one end portion of said swingable member in a manner that said swingable member can be opened and closed with respect to said base member, spring means having one end fixed to a portion for supporting said swingable member pivotally, said spring means being adapted to be twisted forcibly in the closing direction of said swingable member, and transmission means for transmitting the resilient restoring force generated when said spring means is twisted in the closing direction of said swingable member to said swingable member during opening of said swingable member from its closed position, said transmission means being connected to said swingable member through a single arm extending in the vertical plane containing the center of gravity of said swingable member.
Claim 3
Dependent Claim
19 words
An opening and closing apparatus as in claim 1, wherein said spring means comprises a plurality of plate springs.
Claim 4
Dependent Claim
34 words
An opening and closing apparatus as in claim 1, wherein said spring means comprises a plurality of plate springs whose number can be changed for adjusting the resilient restoring force of said spring means.
Claim 5
Dependent Claim
17 words
An opening and closing apparatus as in claim 1, wherein said spring means comprises a coil spring.
Claim 6
Dependent Claim
45 words
An opening and closing apparatus as in claim 1, wherein said transmission means comprises a first member substantially fixed to said spring means and extending in the same direction as that of said spring means, said single arm being substantially fixed to said first member.
Claim 7
Dependent Claim
33 words
An opening and closing apparatus as in claim 5, wherein said first member comprises a support cylinder into which said spring means is fitted tightly, and a collar fixed to said support cylinder.
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) | 1985-09-13 | 1986-03-15 | 1986-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-13 | 1990-03-15 | 1990-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-13 | 1994-03-15 | 1994-09-14 | $7700.00 | Window Closed / Lapsed |