Patent US4452014A successfully refreshed from Google Patents.
US4452014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for operating a sliding door
Assignee: Markus Hermetische Deuren BV
•
Filing: 1982-11-30
•
Granted: 1984-06-05
•
Expires: 2002-11-30
Abstract
Abstract Device for operating a sliding door comprising an endless chain guided over at least two wheels in a plane parallel to the plane of the door, said chain being provided with at least one catch which can co-operate with at least one abutment connected to the door for opening and/or closing said door. The guiding wheels of the chain being positioned such that the direction of movement of the catch has a relatively large vertical component at the beginning of the movement of the door.
Inventors
- 👤 Jan J. G. Markus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:11
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/632; E05F15/643; E05F15/646; E05Y; E05Y2201/00; E05Y2201/60; E05Y2201/622; E05Y2201/638; E05Y2201/684
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
145 words
In a sliding door of the type wherein the door is movable from a first position toward a second position by a first lifting motion followed by a sliding motion, the improvement comprising operating means for moving the door from its first position toward its second position, said operating means including an endless chain carried by at least two guiding wheels disposed above said door in a plane parallel thereto, abutment means associated with said door, and catch means for engaging said abutment means and for urging said door from said first position toward said second position disposed on said endless chain to travel therewith; so that inital movement of said endless chain and catch means against abutment has a relatively large vertical component which gradually approaches zero as the door is urged from its first position toward its second position by said catch means.
Claim 2
Dependent Claim
145 words
In a sliding door of the type wherein the door is movable from a first position toward a second position by a first lifting motion followed by a sliding motion, the improvement comprising operating means for moving the door from its first position toward its second position, said operating means including an endless chain carried by at least two guiding wheels disposed above said door in a plane parallel thereto, abutment means associated with said door, and catch means for engaging said abutment means and for urging said door from said first position toward said second position disposed on said endless chain to travel therewith; so that inital movement of said endless chain and catch means against abutment has a relatively large vertical component which gradually approaches zero as the door is urged from its first position toward its second position by said catch means.
Claim 3
Dependent Claim
51 words
The device according to claim 1, wherein said catch means initially engages said abutment at a point where said catch means is travelling substantially vertically downwards and where, with further travel of said chain, the horizontal speed component of said catch means continuously increases and the vertical speed component continuously decreases.
Claim 4
Dependent Claim
22 words
The device according to claim 1, wherein said first position is a closed position and said second position is an open position.
Claim 5
Dependent Claim
19 words
Device according to claim 1, wherein at least one of the guiding wheels is driven by an electric motor.
Claim 6
Dependent Claim
33 words
The device according to claim 4, wherein the chain always travels in the same direction and the catch means is freed from the abutment when the door is moved into its second position.
Claim 7
Dependent Claim
33 words
The device according to claim 1, wherein the chain always travels in the same direction and the catch means is freed from the abutment when the door is moved to its second position.
Claim 8
Dependent Claim
20 words
The device according to claim 6, wherein the chain includes two catch means at the maximum distance from one another.
References Cited (Backward Citations)
US1324587A
Cited
US3276166A
Cited
US3344556A
Cited
US3473266A
Cited
US3625328A
Cited
US3611637A
Cited
US4313281A
Cited
US4404770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-05 | 1987-12-05 | 1988-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-05 | 1991-12-05 | 1992-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-05 | 1995-12-05 | 1996-06-05 | $7700.00 | Window Closed / Lapsed |