US3895849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic door closure for storage cabinets
Assignee: Protectoseal Co
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Filing: 1974-08-14
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Granted: 1975-07-22
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Expires: 1994-08-14
Abstract
Abstract A door closure mechanism for a storage cabinet including a hydraulic check and a spring arranged so that the spring is at minimum efficiency and the check is at maximum efficiency for closing the doors slowly when the doors are in a fully open position and operative to apply a greater closing force to more rapidly close the doors as they approach the closed position. A lock-out linkage arrangement is provided for assuring a selective door closing sequence.
Inventors
- 👤 William J Zehr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:09
CPC Classifications
A; A62; A62C; A62C2/00; A62C2/06; A62C2/12; E; E05; E05F; E05F5/00; E05F5/12; E05F15/00; E05F15/70; E05F15/72; E05F15/79; E05Y; E05Y2900/00; E05Y2900/20; E05Y2900/21
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
A door closing mechanism for a storage cabinet, having a top and back walls and side walls, a pair of doors hingedly connected along opposite edges of said side walls, said closing mechanism for each of said doors comprising a hydraulic check including a piston housing and a piston means reciprocable therein, a check spring, pivot means connecting said piston means and one end of said check spring at a common location on said door, means connecting the other end of said check spring to the side wall of said cabinet, and pivot means connecting said housing to said cabinet top wall, so that the moment of force extending between the door hinge and said pivot means is at substantially right angles to the force applied by said spring in the closed position of said doors, and so that said spring and said hydraulic check are substantially in quadrature position in said closed door position.
Claim 2
Dependent Claim
155 words
A door closing mechanism for a storage cabinet, having a top and back walls and side walls, a pair of doors hingedly connected along opposite edges of said side walls, said closing mechanism for each of said doors comprising a hydraulic check including a piston housing and a piston means reciprocable therein, a check spring, pivot means connecting said piston means and one end of said check spring at a common location on said door, means connecting the other end of said check spring to the side wall of said cabinet, and pivot means connecting said housing to said cabinet top wall, so that the moment of force extending between the door hinge and said pivot means is at substantially right angles to the force applied by said spring in the closed position of said doors, and so that said spring and said hydraulic check are substantially in quadrature position in said closed door position.
Claim 3
Dependent Claim
30 words
The invention as defined in claim 1 wherein the direction of the force of said spring and said pivot means is approaching parallelism in the open position of said doors.
Claim 4
Dependent Claim
25 words
The invention as defined in claim 2 wherein said hydraulic check includes means for adjusting the resistance to movement of said piston in said casing.
Claim 5
Dependent Claim
135 words
In a cabinet having top, side, back and end walls, a sequence closing linkage arrangement for use with a pair of doors hingedly connected along opposite edges to the side walls, said linkage arrangement comprising a slide bar, means for mounting said bar for sliding movement along a path substantially parallel to the doors in the closed position thereof, first actuating means pivotally secured to one of said doors engageable with one end of said slide bar to prevent closure of said door and second actuating means on the other of said doors engageable with the opposite end of said slide bar means for moving said end of said slide bar means out of the path of said first actuating means so that said other of said doors closes prior to said one door means.
Claim 6
Dependent Claim
135 words
In a cabinet having top, side, back and end walls, a sequence closing linkage arrangement for use with a pair of doors hingedly connected along opposite edges to the side walls, said linkage arrangement comprising a slide bar, means for mounting said bar for sliding movement along a path substantially parallel to the doors in the closed position thereof, first actuating means pivotally secured to one of said doors engageable with one end of said slide bar to prevent closure of said door and second actuating means on the other of said doors engageable with the opposite end of said slide bar means for moving said end of said slide bar means out of the path of said first actuating means so that said other of said doors closes prior to said one door means.
Claim 7
Dependent Claim
57 words
The invention as defined in claim 4 wherein said slide means includes a crank and an arm pivotally connected at one end to said crank, and said second actuating means is engageable to partially rotate said crank whereby said other end of said actuating means is moved out of the path of movement of said bar means.
Claim 8
Dependent Claim
39 words
The invention as defined in claim 5 wherein each of said first and second actuating means is connected intermediate its ends by a radius bar connected at one end to a frame member on which said doors are mounted.
Claim 9
Dependent Claim
29 words
The device according to claim 4 wherein latching means are provided on said other door to automatically lock said doors to said cabinet upon closure of said other door.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |