US4557467A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elbow of staircase hand rail
Assignee: Individual
•
Filing: 1984-08-14
•
Granted: 1985-12-10
•
Expires: 2004-08-14
Abstract
Abstract An improved design of an elbow for a staircase hand rail wherein a specially designed intermediate bearer is used to join the elbow terminal of two adjoining, separately provided hand rails.
Inventors
- 👤 Ta C. Lin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:00
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/18; E04F11/181; E04F11/1836; Y; Y10; Y10T; Y10T403/00; Y10T403/55
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
90 words
An improved elbow of a stairway hand rail comprising two L-shaped hand rail sections, an intermediate means and a plurality of fasteners, characterized in that each of said two L-shaped hand rail sections is terminated with a hollow of smaller diameter and said sections will be united by said intermediate means encompassed within said hollows, and that a pair of symmetrical apertures are provided in said sections in the area of said hollows to cooperate with recesses in said intermediate means to receive said fasteners to secure the resulting elbow.
Claim 2
Dependent Claim
90 words
An improved elbow of a stairway hand rail comprising two L-shaped hand rail sections, an intermediate means and a plurality of fasteners, characterized in that each of said two L-shaped hand rail sections is terminated with a hollow of smaller diameter and said sections will be united by said intermediate means encompassed within said hollows, and that a pair of symmetrical apertures are provided in said sections in the area of said hollows to cooperate with recesses in said intermediate means to receive said fasteners to secure the resulting elbow.
Claim 3
Dependent Claim
53 words
An improved elbow of a stairway hand rail as in claim 1 wherein said intermediate means is a plug inserted into said hollows and said L-shaped sections are rotatably adjustable through 360 degrees, said recesses in said plug being drilled only after the specific angular positions of said L-shaped sections have been determined.
Claim 4
Dependent Claim
80 words
An improved elbow of a stairway hand rail comprising two L-shaped hand rail sections, an intermediate means and a plurality of fasteners characterized in that each of said two L-shaped hand rail sections is terminated with a portion of reduced diameter extending from the end thereof, said portions having symmetrically disposed recesses, said intermediate means being a sleeve to fit over said portions and having apertures to cooperate with said recesses to receive said fasteners to secure the resulting elbow.
Claim 5
Dependent Claim
80 words
An improved elbow of a stairway hand rail comprising two L-shaped hand rail sections, an intermediate means and a plurality of fasteners characterized in that each of said two L-shaped hand rail sections is terminated with a portion of reduced diameter extending from the end thereof, said portions having symmetrically disposed recesses, said intermediate means being a sleeve to fit over said portions and having apertures to cooperate with said recesses to receive said fasteners to secure the resulting elbow.
Claim 6
Dependent Claim
42 words
An improved elbow of a stairway hand rail as in claim 3 wherein said L-shaped sections are rotatably adjustable through 360 degrees and said recesses in said portions of reduced diameter are drilled only after said L-shaped sections have been properly positioned.
References Cited (Backward Citations)
GB511190A
Cited
US2746769A
Cited
US2878059A
Cited
FR1429581A
Cited
US3333823A
Cited
US4353661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-09 | 1989-06-10 | 1989-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-09 | 1993-06-10 | 1993-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-09 | 1997-06-10 | 1997-12-10 | $7700.00 | Window Closed / Lapsed |