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US4043427A
Expired / Lapsed
US
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Stair elevator
Assignee: Individual
•
Filing: 1976-03-19
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Granted: 1977-08-23
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Expires: 1996-03-19
Abstract
Abstract A stair elevator including a chair and associated track adapted for support on a stairway, and further including special limit and emergency switches for controlling movement of the chair along the track. An improved braking device is also provided, as well as a unique low voltage control arrangement, an electrical interlock feature, and a re-set feature.
Inventors
- 👤 Ray Ackerman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:16
CPC Classifications
B; B66; B66B; B66B9/00; B66B9/06; B66B9/08; B66B9/0807; B66B9/083
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
193 words
In a stair elevator, including a track having rails adapted for support on a stairway, a chair unit movable on the track, a reversible driving motor for moving said chair unit along the track, the improvement comprising: a control switch mounted on the chair unit for operation by the user; upper and lower limit switches automatically actuatable at the respective upper and lower ends of the track, and an emergency switch automatically actuatable at the upper end of said track; each of said limit and emergency switches comprising a switch contact assembly, and a cooperating individual magnet, the switch contact assembly or the cooperating individual magnet of both the upper limit switch and the emergency switch being mounted on said chair unit in closely spaced side-by-side staggered relationship and the other of said switch contact assembly or said cooperating individual magnet, being mounted on opposite sides of the switch contact assembly or the cooperating individual magnet mounted on said chair unit and between said rails, so that as the individual contact assemblies are moved relative to the individual cooperating magnets, the emergency switch is actuated after said upper limit switch has been actuated.
Claim 2
Dependent Claim
193 words
In a stair elevator, including a track having rails adapted for support on a stairway, a chair unit movable on the track, a reversible driving motor for moving said chair unit along the track, the improvement comprising: a control switch mounted on the chair unit for operation by the user; upper and lower limit switches automatically actuatable at the respective upper and lower ends of the track, and an emergency switch automatically actuatable at the upper end of said track; each of said limit and emergency switches comprising a switch contact assembly, and a cooperating individual magnet, the switch contact assembly or the cooperating individual magnet of both the upper limit switch and the emergency switch being mounted on said chair unit in closely spaced side-by-side staggered relationship and the other of said switch contact assembly or said cooperating individual magnet, being mounted on opposite sides of the switch contact assembly or the cooperating individual magnet mounted on said chair unit and between said rails, so that as the individual contact assemblies are moved relative to the individual cooperating magnets, the emergency switch is actuated after said upper limit switch has been actuated.
Claim 3
Dependent Claim
84 words
A device as defined in claim 1, further comprising: control circuitry for said elevator, including a power supply connected to said chair unit, a transformer connected to said power supply for stepping down the voltage of said supply to a portion of said control circuitry, the low voltage portion of the circuitry including relay means for controlling contact operation in the high voltage portion of said circuitry, the contact operation in such high voltage portion providing reversal of the operation of the driving motor.
Claim 4
Dependent Claim
84 words
Apparatus as defined in claim 1, in which said relay means in said low voltage portion includes a pair of relay coils, and further including an interlock means for preventing supply of power or current to one of said relays when the other relay has been actuated or has already been energized, said control switch having at least a pair of fixed contacts one of which is connected to one of said relay coils and the other to the other of said relay coils.
Claim 5
Dependent Claim
155 words
Apparatus as defined in claim 1, in which said emergency switch has a pair of normally closed contacts and is connected to said control switch; a snap-action switch operable in response to cable slackening to cause opening of its normally closed contacts, the snap action switch being connected in series with said emergency switch; a pair of push button actuated re-set switches and a pair of indicator lamps or lights which are respectively operable in response to opening of the current supply to said control switch by opening of either said emergency of cable slackening responsive switch so as to cause said respective lamps to become illuminated, thereby to indicate a particular fault that has occurred, said push button switches being located adjacent the respective lamps and being operable to over-ride the said opening of contacts of the aforesaid switches so as to supply power selectively to said relays whereby the chair unit becomes operable.
References Cited (Backward Citations)
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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) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |