US3891907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Actuating mechanism for sliding doors
Assignee: Siemens AG
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Filing: 1973-11-08
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Granted: 1975-06-24
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Expires: 1993-11-08
Abstract
Abstract An actuating mechanism for a sliding door driven by a linear motor comprising a slidable bar coupled to the door, for moving the door into closed and open positions, and a dual stator having the stacks thereof disposed on each side of the bar. A threephase ac and a dc field winding are disposed in the stator for generating a traveling field for moving the sliding bar and a braking field for reducing the velocity of the movement thereof, respectively. The improvement comprises the provision of a first sequential switching means, responsive to movement of the slidable bar, for selectively energizing the dc field winding and generating the braking field as the door is moved from one of its positions to the other by the traveling field. A second sequential switching means, which is responsive to movement of the bar, deenergizes both the ac and dc field windings, and terminates the traveling and braking fields, when the door is moved into its closed and open positions by the bar.
Inventors
- 👤 Dieter Lenzkes
- 👤 Karl-Heinz Seiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:26
CPC Classifications
H; H02; H02K; H02K41/00; H02K41/02; H02K41/025; E; E05; E05F; E05F15/00; E05F15/60; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
242 words
In an actuating mechanism for a sliding door, a linear motor including a slidable bar coupled to the door for moving the door into closed and open positions, a dual stator having the stacks thereof disposed on each side of the bar, ac and dc field windings disposed in the stator, for generating a traveling field for moving the bar and a braking field for reducing the velocity of movement thereof, respectively, and means coupled to the field windings, for energizing the windings and generating said fields, the improvement comprising: first sequential switching means, coupled to said field winding energizing means and responsive to the movement and position of said slidable bar, including a first pair of contact switches disposed adjacent said door and each other for engaging said door, energizing said dc field winding and generating said braking field as said door is moved from one of said positions to the other by said traveling field; and second sequential switching means, coupled to said field winding energizing means, and responsive to movement of said slidable bar, including a second pair of contact switches disposed adjacent said door and adjacent said first pair of contact switches, said first pair of switches being disposed between said second pair of switches, for engaging said door, deenergizing both said ac and dc field windings and terminating said braking and traveling fields when said door is moved by said bar into its closed and open positions.
Claim 2
Dependent Claim
242 words
In an actuating mechanism for a sliding door, a linear motor including a slidable bar coupled to the door for moving the door into closed and open positions, a dual stator having the stacks thereof disposed on each side of the bar, ac and dc field windings disposed in the stator, for generating a traveling field for moving the bar and a braking field for reducing the velocity of movement thereof, respectively, and means coupled to the field windings, for energizing the windings and generating said fields, the improvement comprising: first sequential switching means, coupled to said field winding energizing means and responsive to the movement and position of said slidable bar, including a first pair of contact switches disposed adjacent said door and each other for engaging said door, energizing said dc field winding and generating said braking field as said door is moved from one of said positions to the other by said traveling field; and second sequential switching means, coupled to said field winding energizing means, and responsive to movement of said slidable bar, including a second pair of contact switches disposed adjacent said door and adjacent said first pair of contact switches, said first pair of switches being disposed between said second pair of switches, for engaging said door, deenergizing both said ac and dc field windings and terminating said braking and traveling fields when said door is moved by said bar into its closed and open positions.
Claim 3
Dependent Claim
87 words
The mechanism recited in claim 1, further comprising an armature coupled to one end of said bar, said armature being disposed adjacent to said stator of said linear motor when said door is in its closed position, and means coupled to said field winding energizing means and said second sequential switching means, for generating a locking field having a magnitude which is less than that of said braking field, said locking field flowing through said armature and stator and thereby locking said door in its closed position.
Claim 4
Dependent Claim
33 words
The mechanism recited in claim 2, wherein said armature is angular in shape, and said stator includes a triangular extension for engagement with said armature when said door is in its closed position.
Claim 5
Dependent Claim
38 words
The mechanism recited in claim 2, wherein said means for energizing said field windings comprises a three-phase ac voltage source, and wherein said means for generating said locking field comprises a half-wave rectifier coupled to said voltage source.
Claim 6
Dependent Claim
43 words
The mechanism recited in claim 1, wherein said first sequential switching means further comprises a plurality of parallel coupled contactors having the main contacts thereof coupled to said dc field winding, said first pair of contact switches also being coupled to said contactors.
Claim 7
Dependent Claim
45 words
The mechanism recited in claim 1, wherein said second sequential switching means further comprises a plurality of parallel coupled contactors having the main contacts thereof coupled to said ac and dc field windings, said second pair of contact switches also being coupled to said contactors.
Claim 8
Dependent Claim
36 words
The mechanism recited in claim 1, wherein said means for energizing said field windings comprises a three-phase ac voltage source, and further comprising a bridge rectifier coupled to said voltage source and said dc field winding.
Claim 9
Dependent Claim
60 words
The mechanism recited in claim 1, wherein said field windings are disposed in slots provided in said stator, selected ones of said slots having enlarged portions in which said dc field windings is disposed adjacent said ac field winding, and wherein the width of said dc field winding is at least twice the pole pitch of said ac field winding.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |