US3949801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for automatically closing a folding door
Assignee: Individual
•
Filing: 1974-11-29
•
Granted: 1976-04-13
•
Expires: 1994-11-29
Abstract
Abstract In a door which is openable by being folded into two or more sections, a device which makes it possible to extend the folds automatically and noiselessly to close the door in such a manner that a series of extended folds look like one closed door when a finger tip pressure on the door for opening it has been released. In so doing, no additional automatic closing device such as a door check or a floor hinge is required.
Inventors
- 👤 Giichi Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:50
CPC Classifications
E; E05; E05D; E05D1/00; E05D1/04; E05F; E05F1/00; E05F1/08; E05F1/10; E05F1/12; E05F1/123; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
146 words
A device for automatically closing a folding door having at least two sections comprising: a furnishing member secured to an edge defining the joint of each door section; a coupling pivotably joining each of said furnishing members and defining a pair of longitudinal holes through said coupling along the length of each door section; and a torsion bar inserted into each hole of said coupling and having a radial projection adjacent to one end engaging said coupling, and a transverse bar portion at its opposite end freely contacting said furnishing member so that when the door sections are pivoted open, said torsion bars are twisted between each transverse bar portion and each projection to create a torsional stress in each of said torsion bar so that when said door sections are closed, the torsional stress of each of said torsion bar will automatically close said door.
Claim 2
Independent Claim
146 words
A device for automatically closing a folding door having at least two sections comprising: a furnishing member secured to an edge defining the joint of each door section; a coupling pivotably joining each of said furnishing members and defining a pair of longitudinal holes through said coupling along the length of each door section; and a torsion bar inserted into each hole of said coupling and having a radial projection adjacent to one end engaging said coupling, and a transverse bar portion at its opposite end freely contacting said furnishing member so that when the door sections are pivoted open, said torsion bars are twisted between each transverse bar portion and each projection to create a torsional stress in each of said torsion bar so that when said door sections are closed, the torsional stress of each of said torsion bar will automatically close said door.
Claim 3
Dependent Claim
25 words
The device as recited in claim 1 wherein each of said furnishing members includes a partial longitudinal hole for receiving the axis of said coupling.
Claim 4
Dependent Claim
28 words
The device as recited in claim 2 wherein each of said furnishing members includes a suspending member suspending the transverse bar portion of each of said torsion bars.
Claim 5
Dependent Claim
18 words
The device as recited in claim 1 wherein each of said torsion bars are constructed of metallic wire.
References Cited (Backward Citations)
US1483809A
Cited
US2374925A
Cited
US3067453A
Cited
US3092870A
Cited
US3438152A
Cited
US3456388A
Cited
US3592289A
Cited
US3800328A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |