Patent JPH0442016A successfully refreshed from Google Patents.
Patent NL41383C successfully refreshed from Google Patents.
US4064591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lifting mechanism for sliding doors
Assignee: Pullman Standard Inc
•
Filing: 1976-07-09
•
Granted: 1977-12-27
•
Expires: 1996-07-09
Abstract
Abstract A sliding door includes a roller lifting mechanism provided by horizontally spaced bell cranks to which rollers are connected and which may be pivoted downwardly to engage a door track for raising the door so that it may be laterally moved to one side of the door opening. The lifting mechanism includes a cam element which is manually rotated to exert a push force on the bell crank levers for pivoting the same into the lift position. A modified version of the lift mechanism includes a linkage arrangement which exerts a pulling action on the bell cranks for achieving the lifting function.
Inventors
- 👤 John W. Hutchison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:26
CPC Classifications
E; E05; E05D; E05D15/00; E05D15/56; E05D15/565; E05Y; E05Y2201/00; E05Y2201/60; E05Y2201/622; E05Y2201/688; E05Y2600/00; E05Y2600/10; E05Y2600/20; E05Y2800/00; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
197 words
A sliding door including a vertical door panel, a track positioned below said door for slideably supporting the same, the improvement of a door lifting mechanism comprising; a pair of bell crank levers each including a horizontally disposed arm and a vertically disposed arm, means pivotally supporting said bell crank levers on said panel in horizontally spaced relation, a roller journalled on each of said horizontal arms, a shaft rotatably supported on said panel between said levers, a pair of pull type linkage arrangements each pivotally connected to a respective vertical arm of a respective lever, each linkage arrangement having independent upper and lower sections, each of said upper and lower link sections comprising a plurality of pivotally interconnected link portions to define a flexible link to accommodate pulling action and eliminate pushing action, and a vertically extending rockable member connected to said shaft and having upper and lower portions connected respectively to said upper and lower sections of each of said linkage arrangements and exerting pull forces on said linkage arrangement for pivoting said bell crank levers during rotation of said shaft to pivot said rollers into and out of lifting engagement relative to said track.
Claim 2
Dependent Claim
197 words
A sliding door including a vertical door panel, a track positioned below said door for slideably supporting the same, the improvement of a door lifting mechanism comprising; a pair of bell crank levers each including a horizontally disposed arm and a vertically disposed arm, means pivotally supporting said bell crank levers on said panel in horizontally spaced relation, a roller journalled on each of said horizontal arms, a shaft rotatably supported on said panel between said levers, a pair of pull type linkage arrangements each pivotally connected to a respective vertical arm of a respective lever, each linkage arrangement having independent upper and lower sections, each of said upper and lower link sections comprising a plurality of pivotally interconnected link portions to define a flexible link to accommodate pulling action and eliminate pushing action, and a vertically extending rockable member connected to said shaft and having upper and lower portions connected respectively to said upper and lower sections of each of said linkage arrangements and exerting pull forces on said linkage arrangement for pivoting said bell crank levers during rotation of said shaft to pivot said rollers into and out of lifting engagement relative to said track.
Claim 3
Dependent Claim
85 words
The invention in accordance with claim 1, said rockable member comprising a vertical plate provided with said upper and lower portions, said upper sections including upper link elements pivotally connected to the upper portion and extending horizontally toward said levers, means pivotally connecting said upper link elements to said vertical arms, and said lower sections including lower link elements pivotally connected to said lower portions and extending toward respective levers, and means pivotally connecting said lower link elements to said vertical arms of respective levers.
Claim 4
Dependent Claim
26 words
The invention in accordance with claim 2 including biasing means on said panel connected to said levers for biasing said levers from a door lifting position.
Claim 5
Dependent Claim
19 words
The invention in accordance with claim 3, each said link elements each including a pair of pivotally interconnected links.
Claim 6
Dependent Claim
38 words
The invention in accordance with claim 2, said lower link elements extending diagonally upwardly from the connection to said lower portion of said vertical plate and being connected to said vertical arm concentrically with said upper link elements.
Claim 7
Dependent Claim
20 words
The invention according to claim 5, and said upper and lower sections being arranged to be loaded alternatively in tension.
References Cited (Backward Citations)
US1949805A
Cited
US1804329A
Cited
US2225679A
Cited
US2223760A
Cited
US2488634A
Cited
US2827115A
Cited
US3093091A
Cited
US3440682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |