Patent US2168770A successfully refreshed from Google Patents.
US4136899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door brace
Assignee: Individual
•
Filing: 1978-06-14
•
Granted: 1979-01-30
•
Expires: 1998-06-14
Abstract
Abstract A door brace is provided for use in conjunction with a door having a door knob, the rotation of which permits the door to open. The door brace comprises a first elongated member having its upper end mounted to the door knob and a second elongated member telescopically received within the first member and movable between an extended, ground engaging position and a retracted, inoperative position. A spring under tension is connected between the first and second members and urges the second member from its extended to its retracted position. A lock retains the second member in its extended position and is connected to the door knob so that upon rotation of the knob, the lock is released thus permitting the second member to move from its extended to its retracted position.
Inventors
- 👤 Gary J. Frasher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:41
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: 11
Claim 1
Independent Claim
141 words
A device for use in conjunction with a door having a door knob, the rotation of which permits said door to open, said device comprising: a first elongated member having one end attached to said door, a second elongated member slidably attached to said first member and movable between an extended position wherein said second member abuts a ground support surface and braces the door against unauthorized entry and a retracted position wherein said second member is free of said ground support surface permitting said door to be opened, resilient means for urging said second member from said extended position to said retracted position, locking means for retaining said second member in said extended position, and means responsive to the rotation of said door knob means for unlocking said locking means to permit said members to move to said retracted position.
Claim 2
Independent Claim
141 words
A device for use in conjunction with a door having a door knob, the rotation of which permits said door to open, said device comprising: a first elongated member having one end attached to said door, a second elongated member slidably attached to said first member and movable between an extended position wherein said second member abuts a ground support surface and braces the door against unauthorized entry and a retracted position wherein said second member is free of said ground support surface permitting said door to be opened, resilient means for urging said second member from said extended position to said retracted position, locking means for retaining said second member in said extended position, and means responsive to the rotation of said door knob means for unlocking said locking means to permit said members to move to said retracted position.
Claim 3
Dependent Claim
30 words
The invention as defined in claim 1 wherein at least one of said members is tubular and wherein the other member is telescopically received within the other of said members.
Claim 4
Dependent Claim
66 words
The invention as defined in claim 1 wherein said locking means further comprises a catch pivotally secured to one of said members and movable between a locking and nonlocking position, said catch being adapted to lockingly engage means formed on the other member in said locking position to retain said member in an extended position, and resilient means for urging said catch to said locking position.
Claim 5
Dependent Claim
64 words
The invention as defined in claim 3 wherein said unlocking means comprises an elongated flexible member, means for securing one end of said flexible member to said door knob and means for securing the other end of said flexible member to said catch whereby rotation of said door knob pivots said catch from said locking position to said unlocking position via said flexible member.
Claim 6
Dependent Claim
55 words
The invention as defined in claim 4 wherein said catch is L-shaped and pivotally mounted at its corner, the flexible member is secured to the free end of one arm of said L-shaped catch while the free end of the other arm of the catch engages the locking engagement means formed on the other member.
Claim 7
Dependent Claim
24 words
The invention as defined in claim 1 and including a stop secured to the free end of said second member for engaging said surface.
Claim 8
Dependent Claim
16 words
The invention as defined in claim 6 wherein said stop has a relatively wide lower surface.
Claim 9
Dependent Claim
20 words
The invention as defined in claim 1 wherein said end of said first member is attached around the door knob.
Claim 10
Dependent Claim
21 words
The invention as defined in claim 8 wherein said end of said first member is removably attached around the door knob.
Claim 11
Dependent Claim
15 words
The invention as defined in claim 1 wherein said resilient means is a helical spring.
References Cited (Backward Citations)
US1304394A
Cited
US1943826A
Cited
US1944783A
Cited
US3239261A
Cited
US3989286A
Cited
US4076293A
Cited
US4019765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-29 | 1982-07-31 | 1983-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-29 | 1986-07-31 | 1987-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-29 | 1990-07-31 | 1991-01-30 | $7700.00 | Window Closed / Lapsed |