US3677593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door hardware mechanism including decorative door knobs and door back plates
Assignee: Dekhar Inc
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Filing: 1970-12-30
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Granted: 1972-07-18
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Expires: 1990-12-30
Abstract
Abstract A lock set for a door predrilled to receive a cylindrical type lock includes a pair of apertured centering plate members which can be mounted over a threaded lock spindle and secured to one another at opposite sides of a predrilled door opening in correctly centered positions. The centering plate members when thus secured together present tubular door knob holder portions constituting a solid anchoring base operable to hold rotatable door knobs and spindle portions in coaxial relationship with the drilled hole and in suitably spaced relation to adjacent door surfaces. Back plates are adjustably supported externally of the door knob holder portions without fastenings to constitute a quality door hardware assembly which can be very quickly and cheaply installed.
Inventors
- 👤 Edward John Wahlberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:17
CPC Classifications
E; E05; E05C; E05C1/00; E05C1/08; E05C1/12; E05C1/16; E05C1/163; Y; Y10; Y10T; Y10T292/00; Y10T292/88; Y10T292/91
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
138 words
In a door lock set of the class which includes a cylindrical lock adapted to be secured in a pre-drilled cylindrical hole in a door, a spindle and door knobs and backing plates mounted at the opposite ends of the spindle, wherein the cylindrical hole in the door may be of varying diameters, the combination of a pair of centering plate members having openings for receiving the spindle therethrough, and means on the inner surfaces of each of said plate members for centering the same in the cylindrical hole in the door, said means including an outer flat flange on each of said plate members and a tapered portion extending inwardly of said flat flange, either said tapered portion or said flat flange being engageable with opposite sides of the door, depending upon the diameter of the hole.
Claim 2
Dependent Claim
138 words
In a door lock set of the class which includes a cylindrical lock adapted to be secured in a pre-drilled cylindrical hole in a door, a spindle and door knobs and backing plates mounted at the opposite ends of the spindle, wherein the cylindrical hole in the door may be of varying diameters, the combination of a pair of centering plate members having openings for receiving the spindle therethrough, and means on the inner surfaces of each of said plate members for centering the same in the cylindrical hole in the door, said means including an outer flat flange on each of said plate members and a tapered portion extending inwardly of said flat flange, either said tapered portion or said flat flange being engageable with opposite sides of the door, depending upon the diameter of the hole.
Claim 3
Dependent Claim
140 words
In a doOr lock set of the class which includes a cylindrical lock adapted to be secured in a pre-drilled cylindrical hole in a door, a spindle and door knobs and backing plates mounted at the opposite ends of the spindle, wherein the cylindrical hole in the door may be of varying diameters, the combination of a pair of centering plate members having openings for receiving the spindle therethrough, and means on the inner surfaces of each of said plate members for centering the same in the cylindrical hole in the door, said means including an outer circular tapered edge on each of said plate members, each of said tapered edges terminating in an annular flat flange, either of said edges or said flat flanges being engageable with opposite sides of the door, depending on the diameter of the hole.
Claim 4
Dependent Claim
140 words
In a doOr lock set of the class which includes a cylindrical lock adapted to be secured in a pre-drilled cylindrical hole in a door, a spindle and door knobs and backing plates mounted at the opposite ends of the spindle, wherein the cylindrical hole in the door may be of varying diameters, the combination of a pair of centering plate members having openings for receiving the spindle therethrough, and means on the inner surfaces of each of said plate members for centering the same in the cylindrical hole in the door, said means including an outer circular tapered edge on each of said plate members, each of said tapered edges terminating in an annular flat flange, either of said edges or said flat flanges being engageable with opposite sides of the door, depending on the diameter of the hole.
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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |