Patent US4467889A successfully refreshed from Google Patents.
US4467889A
Expired / Lapsed
US
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Ladder-guided service elevator
Assignee: Individual
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Filing: 1982-10-06
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Granted: 1984-08-28
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Expires: 2002-10-06
Abstract
Abstract A service elevator, designed to carry persons up or down along a building wall or other structure, comprises a ladder secured to that structure and a carriage on which an endless conveyor band is supported. The band has projecting dogs engaging the rungs of the ladder which are held between a first stringer of circular cross-section and a second stringer of rectangular cross-section. The band-supporting frame has sleeves slidably engaging the first stringer and roller pairs bracketing the second stringer. A second conveyor band, serving as a standby for the working band, corotates therewith and has dogs slightly offset from those of the latter for dropping onto the rungs when the working band fails.
Inventors
- 👤 Gerd Maubach
- 👤 Franz-Gunter Vogel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:50
CPC Classifications
B; B66; B66B; B66B7/00; B66B7/02; B66B7/022; B66B9/00; B66B9/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
86 words
A service elevator for transporting persons up and down a steep surface of a structure, comprising: a ladder with upright stringers secured to said structure and equispaced horizontal rungs bridging said stringers; a carriage accommodating a person using the elevator; a frame on said carriage slidably engaging said stringers; endless conveyor means on said frame having dogs spaced apart by the same distance as said rungs for coacting therewith to raise and lower said carriage; and drive means coupled with said conveyor means for operating same.
Claim 2
Dependent Claim
86 words
A service elevator for transporting persons up and down a steep surface of a structure, comprising: a ladder with upright stringers secured to said structure and equispaced horizontal rungs bridging said stringers; a carriage accommodating a person using the elevator; a frame on said carriage slidably engaging said stringers; endless conveyor means on said frame having dogs spaced apart by the same distance as said rungs for coacting therewith to raise and lower said carriage; and drive means coupled with said conveyor means for operating same.
Claim 3
Dependent Claim
55 words
A service elevator as defined in claim 1 wherein said stringers are a first stringer of circular cross-section and a second stringer with two faces paralleling a common midplane of said stringers, said frame being provided with sleeve means embracing said first stringer and roller means bracketing said second stringer in contact with said faces.
Claim 4
Dependent Claim
25 words
A service elevator as defined in claim 2 wherein said sleeve means comprises a pair of vertically spaced-apart sleeves with longitudinal slots clearing said rungs.
Claim 5
Dependent Claim
24 words
A service elevator as defined in claim 3 wherein said roller means comprises two roller pairs substantially disposed at the levels of said sleeves.
Claim 6
Dependent Claim
18 words
A service elevator as defined in claim 4 wherein said roller pairs and said sleeves consist of Teflon.
Claim 7
Dependent Claim
30 words
A service elevator as defined in claim 4 wherein said frame comprises an upper and a lower yoke each carrying one of said sleeves and one of said roller pairs.
Claim 8
Dependent Claim
36 words
A service elevator as defined in claim 1 wherein said conveyor means comprises at least one endless band developing upper and lower roller means on said frame, said band having an outer surface carrying said dogs.
Claim 9
Dependent Claim
35 words
A service elevator as defined in claim 7 wherein said band has a working run confronting said ladder, further comprising backing means inside said band having a sliding surface in contact with said working run.
Claim 10
Dependent Claim
84 words
A service elevator as defined in claim 7 wherein said conveyor means further comprises an endless standby band coupled with said drive means for joint rotation with said one endless band, said endless bands having working runs confronting said ladder, said standby band carrying dogs which on the working run thereof are slightly offset in an upward direction from respective dogs on the working face of said one endless band for remaining disengaged from said rungs during normal operation of said one endless band.
Claim 11
Dependent Claim
16 words
A service elevator as defined in claim 9 wherein said working runs lie between said stringers.
Claim 12
Dependent Claim
43 words
A service elevator as defined in claim 8 wherein the working run of said band has a lower end slanting away from said ladder at an acute angle for gradually separating said dogs from said rungs on a descent of said working run.
Claim 13
Dependent Claim
29 words
A service elevator as defined in claim 8 wherein said working run parallels said ladder over at least the spacing of two rungs simultaneously engageable by respective dogs thereof.
Claim 14
Dependent Claim
28 words
A service elevator as defined in claim 7 wherein said upper and lower roller means are gears, said band being internally toothed for positive engagement with said gears.
Claim 15
Dependent Claim
21 words
A service elevator as defined in claim 7 wherein said drive means is disconnectably coupled with one of said roller means.
Claim 16
Dependent Claim
20 words
A service elevator as defined in claim 7, further comprising a centrifugal brake coupled with one of said roller means.
Claim 17
Dependent Claim
27 words
A service elevator as defined in claim 2 wherein said second stringer is of square cross-section with a width substantially equaling the diameter of said first stringer.
Claim 18
Dependent Claim
14 words
A service elevator as defined in claim 1 wherein said stringers are steel pipes.
Claim 19
Dependent Claim
18 words
A service elevator as defined in claim 16 wherein said rungs are cylindrical and penetrate into said stringers.
Claim 20
Dependent Claim
25 words
A service elevator as defined in claim 1 wherein said drive means comprises an electric motor coupled with said conveyor means through a worm gearing.
Claim 21
Dependent Claim
23 words
A service elevator as defined in claim 1 wherein said carriage is a cage with a swingable part giving access to said ladder.
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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) | 1987-08-28 | 1988-02-27 | 1988-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-08-28 | 1992-02-27 | 1992-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-08-28 | 1996-02-27 | 1996-08-28 | $7700.00 | Window Closed / Lapsed |