US4804238A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Torsion spring powered door
Assignee: AMERICAN TELEPHONE AND TELEGRAPH Co - AT&T TELETYPE
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Filing: 1987-01-28
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Granted: 1989-02-14
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Expires: 2007-01-28
Abstract
Abstract An access door has a frame formed with longitudinally extending channels which receive a closure element for sliding therealong. A torsion spring secured to the frame and to the closure element maintains the closure element in an open or closed position.
Inventors
- 👤 Albert Bischof
- 👤 Norbert A. Rumps, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:26
CPC Classifications
E; E05; E05D; E05D15/00; E05D15/16; E05D13/00; E05D13/10; E05D13/12; E06; E06B; E06B11/00; E06B11/02; E05Y; E05Y2900/00; E05Y2900/20
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
148 words
An access door assembly for mounting in a cabinet, the cabinet having a substantially rectangular opening, said assembly comprising: a frame having a pair of spaced columns defining opposed longitudinally extending channels; a pair of parallel cross-bars connecting said channels, said channels and cross-bars defining an opening which substantially matches shape and size of the opening in the cabinet; a closure element of a size and shape to fit said opening in the frame having two of its edges slidably mounted in said channels for movement of the closure element therein between open and closed positions; said columns extending past said opening formed by said columns and said cross-bars so as to accommodate the closure element when said element is in said open position; and a spring means connecting said element to said frame being operable against said element to keep it in an open or closed position.
Claim 2
Dependent Claim
148 words
An access door assembly for mounting in a cabinet, the cabinet having a substantially rectangular opening, said assembly comprising: a frame having a pair of spaced columns defining opposed longitudinally extending channels; a pair of parallel cross-bars connecting said channels, said channels and cross-bars defining an opening which substantially matches shape and size of the opening in the cabinet; a closure element of a size and shape to fit said opening in the frame having two of its edges slidably mounted in said channels for movement of the closure element therein between open and closed positions; said columns extending past said opening formed by said columns and said cross-bars so as to accommodate the closure element when said element is in said open position; and a spring means connecting said element to said frame being operable against said element to keep it in an open or closed position.
Claim 3
Dependent Claim
18 words
An access door assembly as defined in claim 1, wherein said spring means comprises a wire-type torsion spring.
Claim 4
Dependent Claim
21 words
An access door assembly as defined in claim 1 further comprising means for releasably mounting said frame assembly in the cabinet.
Claim 5
Dependent Claim
51 words
An access door assembly as defined in claim 3 wherein said mounting means comprises: a pair of retainers mounted in the cabinet, each retainer having at least two flexible fingers extending therefrom, and; each of said columns having at least two recesses, each recess adapted to receive of one said fingers.
Claim 6
Dependent Claim
49 words
An access door assembly as defined in claim 4 wherein said mounting means further includes a lip extending from one surface of said door assembly, said lip having size and shape allowing it to pass through said opening in said cabinet thereby locating said door assembly in said cabinet.
Claim 7
Dependent Claim
26 words
An access door assembly as defined in claim 1, wherein said frame is formed by a pair of parallel frame portions removably connected to each other.
Claim 8
Dependent Claim
22 words
An access door assembly as defined in claim 6, wherein a channel is formed in at least one of said frame portions.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |