US4053961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for holding open a door or the like
Assignee: Individual
•
Filing: 1976-02-05
•
Granted: 1977-10-18
•
Expires: 1996-02-05
Abstract
Abstract Apparatus for holding open a door or similar closure member for a limited period, which may be predetermined, whereupon the door is automatically released and is able to return to its closed position, includes suction means for attachment to the door and/or surface against which the door is to be held in face-to-face relationship. The period of time during which the suction means is active may be determined by means of an air leakage to the suction means, or by means of a spring acting against the suction means.
Inventors
- 👤 Murray Vincent Wilson
- 👤 Norman Henry Pearce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:15
CPC Classifications
F; F16; F16B; F16B47/00; E; E05; E05C; E05C17/00; E05C17/02; E05C17/46; E05C17/52; E05C17/525; Y; Y10; Y10S; Y10S16/00; Y10S16/21; Y10S292/00; Y10S292/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
167 words
Apparatus for retaining a closure member in an open position in which position said member lies in face-to-face relationship with a fixed surface, comprising a suction pad adapted for attachment to one of said member and surface whereby when said member is opened, the suction pad retains it in an open position, said suction pad having air-leakage means to automatically break the suction between the pad and the other of said member and surface a predetermined time after the formation of said suction, the pad having a boss thereon for attachment to said one of said member and surface, said air-leakage means comprising a passageway extending through said boss, and a further passageway extending along the surface of said boss thereby to provide communication between the area of the suction and the atmosphere when the pad is secured to said one of said member and surface, said further passage comprising a groove along the surface of the boss that contacts said one of said member and surface.
Claim 2
Dependent Claim
167 words
Apparatus for retaining a closure member in an open position in which position said member lies in face-to-face relationship with a fixed surface, comprising a suction pad adapted for attachment to one of said member and surface whereby when said member is opened, the suction pad retains it in an open position, said suction pad having air-leakage means to automatically break the suction between the pad and the other of said member and surface a predetermined time after the formation of said suction, the pad having a boss thereon for attachment to said one of said member and surface, said air-leakage means comprising a passageway extending through said boss, and a further passageway extending along the surface of said boss thereby to provide communication between the area of the suction and the atmosphere when the pad is secured to said one of said member and surface, said further passage comprising a groove along the surface of the boss that contacts said one of said member and surface.
Claim 3
Dependent Claim
12 words
Apparatus as claimed in claim 1, said air-leakage means including a valve.
Claim 4
Dependent Claim
16 words
Apparatus as claimed in claim 1, and spring means to assist the breaking of the suction.
References Cited (Backward Citations)
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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) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |