US3913361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doorknob security device
Assignee: Individual
•
Filing: 1974-06-03
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Granted: 1975-10-21
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Expires: 1994-06-03
Abstract
Abstract A device having a U-shaped member secured to the shackle of a padlock for lockably shielding the keyhole of a bulbous shaped doorknob is disclosed.
Inventors
- 👤 Max Fried
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:57
CPC Classifications
E; E05; E05B; E05B17/00; E05B17/14; E05B17/142; Y; Y10; Y10T; Y10T70/00; Y10T70/70; Y10T70/7441; Y10T70/7915; Y10T70/7955; Y10T70/796; Y10T70/7977; Y10T70/7983
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
182 words
A unitary security device for lockable doorknobs of the type having a shaft extending lateral from a door and terminating in a bulbous grip, a key operated lock mounted within the grip having a keyhole generally axially aligned with the shaft and disposed on the face of the grip opposite to the shaft, said security device comprising in combination: A. a U-shaped channel for receiving the grip, said U-shaped channel including a. a centerpiece positionable adjacent the face of the grip and overlapping the keyhole, said centerpiece being of a width generally commensurate with the width of the grip; and b. an arcuate shroud extending from opposite edges of said centerpiece, said shroud extending laterally toward the door to encase the perimeter of said grip; B. a padlock including a shackle for straddling the shaft and a lock mechanism for selectively engaging one leg of said shackle; and C. means securing said arcuate shroud to said shackle; whereby, access to the keyhole in the grip is inhibited by said centerpiece, and frictional engagement with said grip is prevented by said arcuate shroud.
Claim 2
Dependent Claim
182 words
A unitary security device for lockable doorknobs of the type having a shaft extending lateral from a door and terminating in a bulbous grip, a key operated lock mounted within the grip having a keyhole generally axially aligned with the shaft and disposed on the face of the grip opposite to the shaft, said security device comprising in combination: A. a U-shaped channel for receiving the grip, said U-shaped channel including a. a centerpiece positionable adjacent the face of the grip and overlapping the keyhole, said centerpiece being of a width generally commensurate with the width of the grip; and b. an arcuate shroud extending from opposite edges of said centerpiece, said shroud extending laterally toward the door to encase the perimeter of said grip; B. a padlock including a shackle for straddling the shaft and a lock mechanism for selectively engaging one leg of said shackle; and C. means securing said arcuate shroud to said shackle; whereby, access to the keyhole in the grip is inhibited by said centerpiece, and frictional engagement with said grip is prevented by said arcuate shroud.
Claim 3
Dependent Claim
29 words
The combination set forth in claim 1, wherein said means securing said arcuate shroud to said shackle comprises spacers extending radially inwardly from said arcuate shroud to said shackle.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |