US3793773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collapsing mechanism for revolving door wings
Assignee: International Steel Co
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Filing: 1972-08-01
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Granted: 1974-02-26
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Expires: 1992-08-01
Abstract
Abstract The right angular wings of a revolving door are secured releasably in normal radial use positions by the interlocking action of plastic plungers and cooperating notches in the peripheries of upper and lower hanger discs on the door center shaft. The plastic plungers may be housed on the horizontal portions of upper and lower hanger bars which serve to suspend the revolving door wings pivotally from the hanger discs. The arrangement assures safe collapsing or folding of the door wings in case of panic and prevents premature collapsing due to stack drafts found in many modern buildings or jarring by a user of the door.
Inventors
- 👤 A Sheckells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:58
CPC Classifications
E; E06; E06B; E06B3/00; E06B3/90; E05; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132; Y; Y10; Y10S; Y10S292/00; Y10S292/38
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
221 words
In a revolving door of the type which turns about an upright center axis of rotation and has plural radiating door wings, hanger assemblies for the door wings at the tops and bottoms of the door wings, said hanger assemblies comprising upper and lower hanger discs, hanger bar means carried by each door wing and having pivotal connections with said hanger discs, and yielding detent means on the hanger assemblies releasably locking said wings in radially extended use positions but allowing collapsing of the wings independently around said center axis of rotation in panic exit conditions, each detent means comprising a detent plunger formed of a tough high sTrength wear-resistant shockabsorbant polymerized resin, a pair of side, forwardly converging flat faces on the leading end of the detent plunger separated by an intervening center leading end flat face, said side and end faces providing detent contact surface areas; holder means for said detent plunger including adjustable spring tension means exerting a variable force on the detent plunger in an inward radial direction, and each hanger disc having a peripheral, substantially V-shaped, detent notch for each detent plunger, each notch having opposed flat faces providing coacting contact surface areas slidably receiving the converging flat faces of the detent plunger during seating and unseating movements of the plunger with relation to the notch.
Claim 2
Dependent Claim
221 words
In a revolving door of the type which turns about an upright center axis of rotation and has plural radiating door wings, hanger assemblies for the door wings at the tops and bottoms of the door wings, said hanger assemblies comprising upper and lower hanger discs, hanger bar means carried by each door wing and having pivotal connections with said hanger discs, and yielding detent means on the hanger assemblies releasably locking said wings in radially extended use positions but allowing collapsing of the wings independently around said center axis of rotation in panic exit conditions, each detent means comprising a detent plunger formed of a tough high sTrength wear-resistant shockabsorbant polymerized resin, a pair of side, forwardly converging flat faces on the leading end of the detent plunger separated by an intervening center leading end flat face, said side and end faces providing detent contact surface areas; holder means for said detent plunger including adjustable spring tension means exerting a variable force on the detent plunger in an inward radial direction, and each hanger disc having a peripheral, substantially V-shaped, detent notch for each detent plunger, each notch having opposed flat faces providing coacting contact surface areas slidably receiving the converging flat faces of the detent plunger during seating and unseating movements of the plunger with relation to the notch.
Claim 3
Dependent Claim
26 words
The structure of claim 1, and said hanger disc comprising a bronze disc, and said detent plunger formed of acetal resin derived by polymerization of formaldehyde.
Claim 4
Dependent Claim
50 words
The structure of claim 1, and said forwardly converging flat faces of said detent plunger defining an included angle of not less than about 60* and not more than 75*, said V-shaped notch of said hanger disc defining substantially the identical included angle between the side faces of said notch.
Claim 5
Dependent Claim
61 words
The structure of claim 3, and the entrance to the V-shaped notch having smoothly rounded shoulders leading into the notch on the opposite sides thereof, said shoulders formed on said hanger disc, said shoulders allowing the detent plunger to travel smoothly from said notch onto the peripheral edge of the hanger disc during the collapsing or repositioning of a door wing.
Claim 6
Dependent Claim
58 words
The structure of claim 1, and said detent contact surface areas on said detent plunger extending in vertical planes, said detent notch being formed vertically through said hanger disc from the top to the bottom face thereof, and means on said holder means engaging the detent plunger to prevent turning thereof on a horizontal axis through the plunger.
Claim 7
Dependent Claim
31 words
The structure of claim 5, and said last-named means comprising a flat face on the detent plunger, and a coacting radial locator pin on the holder means engaging said flat face.
Claim 8
Dependent Claim
61 words
The structure of claim 1, and said holder means comprising a housing secured to said hanger bar means and having a bore, said detent plunger being externally cylindrical and engaging slidably within said bore, a compression spring within said bore engaging the rearward end of the plunger, and a screw-threaded spring tension adjusting plug in the rearward portion of said bore.
Claim 9
Dependent Claim
21 words
The structure of claim 7, and a central reduced diameter spring centering extension on the rearward end of the detent plunger.
Claim 10
Dependent Claim
45 words
The structure of claim 1, and said pair of converging end faces extending equidistantly rearwardly from said leading end faces, said plunger being externally cylindrical and having a horizontal cylindrical axis normal to the leading end face and lying midway between said converging flat faces.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |