Patent US3936085A successfully refreshed from Google Patents.
US3936085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door lock protector
Assignee: Individual
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Filing: 1975-02-24
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Granted: 1976-02-03
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Expires: 1995-02-24
Abstract
Abstract A lock protector for wooden doors equipped with both the usual bolt or latch lock and the common safety chain, consisting of a strong metal door plate of U-form adapted to bridge the free edge portion of a door at the lock and apertured to pass the lock bolt, and a chain plate adapted to be strongly affixed to the door frame, the safety chain being permanently affixed to the door plate and detachably connected to the chain plate. Strong affixation of the plates to the door and door frame resists tearing out the chain connections by kicks, blows, or pressure applied to the door, and the form of the door plate offers similar protection to the bolt assembly. Additionally, the chain plate is specially formed to prevent the common type of break-in known as "credit card" entry.
Inventors
- 👤 Donald L. Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:12
CPC Classifications
E; E05; E05B; E05B17/00; E05B17/20; E05B17/2084; Y; Y10; Y10T; Y10T292/00; Y10T292/28; Y10T292/283
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
234 words
In combination with a wooden door having opposite vertical faces and opposite vertical edge surfaces, a door frame to which one vertical edge of said door is hinged, and a lock mechanism including a bolt carried in said door and extendable from the free edge of said door, and a striker plate carried by said door frame and engageable by said bolt, a lock protector comprising: a. a chain plate of right-angled form, a first leg of which overlies the face of said door frame confronting the free edge surface of said door, and the second leg of which overlies the face of said door frame toward which said door opens, b. means affixing both legs of said chain plate rigidly to said door frame, c. a safety chain, and d. means attaching the respective ends of said safety chain to said door adjacent the free vertical edge thereof, and to said chain plate, one of said attaching means being readily detachable, said means attaching one end of said chain to said door comprising a strong, U-shaped metal door plate adapted to enclose the free edge portion of said door with its parallel legs overlying the faces of said door and the connecting portion thereof bridging the free edge surface of said door, one end of said chain being attached to said door plate, and means rigidly affixing said door plate to said door.
Claim 2
Dependent Claim
234 words
In combination with a wooden door having opposite vertical faces and opposite vertical edge surfaces, a door frame to which one vertical edge of said door is hinged, and a lock mechanism including a bolt carried in said door and extendable from the free edge of said door, and a striker plate carried by said door frame and engageable by said bolt, a lock protector comprising: a. a chain plate of right-angled form, a first leg of which overlies the face of said door frame confronting the free edge surface of said door, and the second leg of which overlies the face of said door frame toward which said door opens, b. means affixing both legs of said chain plate rigidly to said door frame, c. a safety chain, and d. means attaching the respective ends of said safety chain to said door adjacent the free vertical edge thereof, and to said chain plate, one of said attaching means being readily detachable, said means attaching one end of said chain to said door comprising a strong, U-shaped metal door plate adapted to enclose the free edge portion of said door with its parallel legs overlying the faces of said door and the connecting portion thereof bridging the free edge surface of said door, one end of said chain being attached to said door plate, and means rigidly affixing said door plate to said door.
Claim 3
Dependent Claim
55 words
A lock protector as recited in claim 1 wherein said means affixing said door plate to said door comprises: a. abutment members overlying the respective parallel legs of said door plate at the outer surfaces thereof, and b. tensile members extending through said door normally to the plane thereof and rigidly interconnecting said abutment members.
Claim 4
Dependent Claim
34 words
A lock protector as recited in claim 1 wherein said door plate extends well above and below the bolt of the lock mechanism, and wherein its connecting portion is apertured to pass said bolt.
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) | 1979-02-02 | 1979-08-04 | 1980-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-02 | 1983-08-04 | 1984-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-02 | 1987-08-04 | 1988-02-03 | $7700.00 | Window Closed / Lapsed |