Patent US4456291A successfully refreshed from Google Patents.
US4456291A
Expired / Lapsed
US
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Door prop
Assignee: Individual
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Filing: 1981-08-28
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Granted: 1984-06-26
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Expires: 2001-08-28
Abstract
Abstract A prop for bracing against a door, so as to prevent opening by an intruder, the present patent application including two designs of the invention, each design including a channel secured to a door under the door knob and a brace pivotably supported from the channel, and in order that a lower end of the brace reaches the floor for bracing thereagainst, one design includes slots in the channel along which a pivoted end of the brace is slidable while the other design has the brace made telescopic.
Inventors
- 👤 Earl W. Brogie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 01:22
CPC Classifications
E; E05; E05C; E05C19/00; E05C19/003; E05C19/004; Y; Y10; Y10S; Y10S292/00; Y10S292/15; Y10T; Y10T292/00; Y10T292/65
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
164 words
A door prop to prevent door opening, comprising in combination, a base mounted under a door knob on a door, and a brace assembly supported from said base, said base comprising a channel with opposing end walls spaced within which said brace is secured, a lower end of said brace having a foot for frictional engagement upon a floor, and means for pivoting an upper end of said brace assembly on said channel and lowering said foot to engage the floor frictionally wherein said means comprises a cross pin through an upper end of said brace assembly being pivotable in a hole in each said end wall, whereby said brace assembly normally hangs vertically in said channel spaced from floor surface, said brace assembly including a foot guide pin bolt slidably mounted in a tube groove having upper and lower transverse terminals for retaining said foot in the position spaced from said floor surface and in an operative extended position abutting said floor surface.
Claim 2
Dependent Claim
164 words
A door prop to prevent door opening, comprising in combination, a base mounted under a door knob on a door, and a brace assembly supported from said base, said base comprising a channel with opposing end walls spaced within which said brace is secured, a lower end of said brace having a foot for frictional engagement upon a floor, and means for pivoting an upper end of said brace assembly on said channel and lowering said foot to engage the floor frictionally wherein said means comprises a cross pin through an upper end of said brace assembly being pivotable in a hole in each said end wall, whereby said brace assembly normally hangs vertically in said channel spaced from floor surface, said brace assembly including a foot guide pin bolt slidably mounted in a tube groove having upper and lower transverse terminals for retaining said foot in the position spaced from said floor surface and in an operative extended position abutting said floor surface.
Claim 3
Dependent Claim
23 words
A prop as in claim 1 wherein a spring is provided between said channel and said brace biasing said brace toward said channel.
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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |