Patent US3765137A successfully refreshed from Google Patents.
US3765137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prefabricated metal staircase
Assignee: Individual
•
Filing: 1971-11-26
•
Granted: 1973-10-16
•
Expires: 1991-11-26
Abstract
Abstract The present invention relates to a prefabricated metal staircase which may be assembled from structural members comprising extruded elements which may be made of aluminium. Staircases in accordance with the invention may serve as fixed permanent staircases or as temporary or emergency staircases and may be very versatile in view of the ease and rapidity with which they may be assembled and in view of their adaptability to provide whatever angle is required to meet the local situation.
Inventors
- 👤 G Loix
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:37
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08; E06C7/081; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/025; E04F11/0255
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
179 words
A staircase assembly of prefabricated components composed of a plurality of extruded sections cut to predetermined lengths to provide structural members appropriate to the size of the staircase, said assembly comprising a pair of stringers or side members each comprising one of said extruded sections having a hollow cross-section in the shape of a figure ''''8'''' and each having mounted on an inner side wall a pair of longitudinal members comprising another of said extruded sections, each longitudinal member having therein means defining a plurality of holes at predetermined positions determined by the staircase angle adopted, a plurality of projecting elements each disposed in one of said holes, each projecting element of one longitudinal member coacting with a projecting element of the other longitudinal member to provide a pair of supports, a step member comprising a further one of said extruded sections extending between said pair of stringers or side members and supported by said projecting elements, said step member having means for adapting itself to the distance between said pair of projecting elements comprising said pair of supports.
Claim 2
Dependent Claim
179 words
A staircase assembly of prefabricated components composed of a plurality of extruded sections cut to predetermined lengths to provide structural members appropriate to the size of the staircase, said assembly comprising a pair of stringers or side members each comprising one of said extruded sections having a hollow cross-section in the shape of a figure ''''8'''' and each having mounted on an inner side wall a pair of longitudinal members comprising another of said extruded sections, each longitudinal member having therein means defining a plurality of holes at predetermined positions determined by the staircase angle adopted, a plurality of projecting elements each disposed in one of said holes, each projecting element of one longitudinal member coacting with a projecting element of the other longitudinal member to provide a pair of supports, a step member comprising a further one of said extruded sections extending between said pair of stringers or side members and supported by said projecting elements, said step member having means for adapting itself to the distance between said pair of projecting elements comprising said pair of supports.
Claim 3
Dependent Claim
53 words
A staircase in accordance with claim 1, including means defining a pair of slideways in each stringer of said pair of stringers, one slideway disposed near the top of said stringer and the other slideway disposed near the bottom of said stringer, and wherein said longitudinal members are each mounted in one slideway.
Claim 4
Dependent Claim
32 words
A staircase in accordance with claim 1, wherein said step member has a main upper portion with a substantially plane surface and front and rear edge portions which extend downwards and inwards.
Claim 5
Dependent Claim
81 words
A staircase in aCcordance with claim 3, including means defining a pair of spaced flanges projecting from the underside of said step member, and wherein the rear edge portion of each said step member comprising means for embracing the associated supporting projecting elements of the lower longitudinal members of the stringers or side members, and wherein the related supporting projecting elements of the upper longitudinal members of the stringers or side members comprising means fitable between said pair of spaced flanges.
Claim 6
Dependent Claim
22 words
A staircase, in accordance with claim 1, wherein said projecting elements comprise tube parts inserted into said holes in said longitudinal members.
Claim 7
Dependent Claim
62 words
A staircase, in accordance with claim 5, including a bolt extending through said tube parts forming the supporting projecting elements, said bolt having a head end disposed adjacent the respective longitudinal member and an opposite end projecting from the end of the tube part under the step member, said opposite end having a clamping or fixing member for engaging said step member.
Claim 8
Dependent Claim
48 words
A staircase in accordance with claim 6, wherein said spaced flanges of each step member have means therein defining cut-outs or openings for accommodating said clamping or fixing member of said bolts of said supporting tube parts of said upper longitudinal members of said stringers or side members.
Claim 9
Dependent Claim
48 words
A staircase in accordance with claim 4 including means defining a plurality of support members projecting from the underside of said step member near the rear edge portion of said step member, each support member having means contactable in supporting relationship with one of said supporting tube parts.
Claim 10
Dependent Claim
43 words
A staircase in accordance with claim 3 including means in the front and rear edge portions of each said step member defining a plurality of grooves for receiving therein closure plates for closing the underside of the step member and for providing risers.
Claim 11
Dependent Claim
39 words
A staircase in accordance with claim 9, including means in the underside of the main upper portion of said step member defining a centrally disposed web stiffener for stiffening said step member and for supporting an underside closure plate.
Claim 12
Dependent Claim
17 words
A staircase in accordance with claim 1, wherein said step member has means defining a non-slip surface.
Claim 13
Dependent Claim
32 words
A staircase in accordance with claim 1, wherein the top of each of said stringers or side members has means therein defining a plurality of apertures for fitting therein a balustrade rail.
Claim 14
Dependent Claim
15 words
A staircase in accordance with claim 1, wherein said extruded sections are composed of aluminium.
References Cited (Backward Citations)
US538145A
Cited
US1593360A
Cited
US1676317A
Cited
US3150742A
Cited
US3367444A
Cited
US3608256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |