Patent US3908325A successfully refreshed from Google Patents.
US3908325A
Expired / Lapsed
US
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Flight of steps and a staircase comprising a flight of steps
Assignee: KENNGOTT KG
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Filing: 1973-10-11
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Granted: 1975-09-30
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Expires: 1993-10-11
Abstract
Abstract A flight of free or cantilevering steps, anchored in a wall. The steps support one another by a set of spindles, rising from a rear end portion of one step to a front edge portion of the next upper step, each set including a spindle adjacent the wall and another spindle remote from the wall. For anchoring the steps to the wall the structure comprises a number of rigid bars, regularly distributed relative to the several steps, each bar having a portion which projects beyond the step and into the wall, into a recess of cylindrical shape, filled with strong mortar.
Inventors
- 👤 Hans Kenngott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:28
CPC Classifications
E; E04; E04F; E04F11/00; E04F11/02; E04F11/022; E04F11/035
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
295 words
A staircase leading from a bottom plane structure, such as a floor or a landing in a building structure, to a top plane structure such as a landing or a roof in said building structure, comprising; a wall, a plurality of steps upwardly spaced from one another, forwardly following one another, and laterally spaced a short distance from said wall, every step but the uppermost one havinG a rear edge portion overlapped by a front edge portion of the next upper step and the uppermost step having a rear edge portion overlapping a front edge portion of a top plane structure; means for supporting the steps by one another, comprising sets of spindles rising from the rear edge portion of one step to the front edge portion of the next upper step, each set comprising two spindles, to-wit, a spindle adjacent the wall and another spindle remote from the wall; means for holding the steps a short distance from the wall and comprising a number of rigid bars said number being no greater than the number of steps in said plurality of steps and said bars being regularly distributed relative to the plurality of steps, each bar having a generally rectangular cross-sectional shape, having a cross section smaller than and generally parallel to that of a step, and having a portion secured to an underside of one of the steps, adjacent the wall, in the respective rear edge portion, with aid of one of said spindles; a portion of each bar projecting from the step toward and into the wall, the wall having recesses, each receiving one of the projecting portions of said bars; and means in each recess for holding the projecting portion of the corresponding rigid bar, rigidly anchored to the wall bar.
Claim 2
Dependent Claim
295 words
A staircase leading from a bottom plane structure, such as a floor or a landing in a building structure, to a top plane structure such as a landing or a roof in said building structure, comprising; a wall, a plurality of steps upwardly spaced from one another, forwardly following one another, and laterally spaced a short distance from said wall, every step but the uppermost one havinG a rear edge portion overlapped by a front edge portion of the next upper step and the uppermost step having a rear edge portion overlapping a front edge portion of a top plane structure; means for supporting the steps by one another, comprising sets of spindles rising from the rear edge portion of one step to the front edge portion of the next upper step, each set comprising two spindles, to-wit, a spindle adjacent the wall and another spindle remote from the wall; means for holding the steps a short distance from the wall and comprising a number of rigid bars said number being no greater than the number of steps in said plurality of steps and said bars being regularly distributed relative to the plurality of steps, each bar having a generally rectangular cross-sectional shape, having a cross section smaller than and generally parallel to that of a step, and having a portion secured to an underside of one of the steps, adjacent the wall, in the respective rear edge portion, with aid of one of said spindles; a portion of each bar projecting from the step toward and into the wall, the wall having recesses, each receiving one of the projecting portions of said bars; and means in each recess for holding the projecting portion of the corresponding rigid bar, rigidly anchored to the wall bar.
Claim 3
Dependent Claim
78 words
A staircase according to claim 1 including means for anchoring the lowermost one of said plurality of steps to a bottom plane portion of a building structure adjacent said wall, comprising at least one spindle which has vertically spaced ends secured respectively to the lowermost step and to the bottom plane portion, and means on said spindle for enabling the spindle to sustain tensile as well as compressive forces between the respective step and the bottom plane portion.
Claim 4
Dependent Claim
85 words
A staircase according to claim 1 including means for anchoring the uppermost step of said plurality of steps to a top plane portion of a building structure to effectively secure the uppermost step to the top plane portion comprising an edge portion of the uppermost step extending into the wall, the wall having an elongate recess adjacent the top plane structure receiving said edge portion; and means in said elongate recess for holding the uppermost step to the wall and for preventing it from turning.
Claim 5
Dependent Claim
67 words
A staircase according to claim 1 including means for anchoring the uppermost one of said plurality of steps to a building structure to effectively secure it to a top plane structure therein, comprising a set of rigid bars distributed along a rear edge portion of said uppermost step, secured to said rear edge portion, extending forwardly therefrom into the top plane structure, and secured to the latter.
Claim 6
Dependent Claim
208 words
A flight of steps, comprising; a plurality of rigid steps upwardly spaced from one another and forwardly following one another, every step but the uppermost one having a rear edge portion overlapped by a front edge portion of the next upper step, the uppermost step having a rear edge portion disposed to overlap a front edge portion of a top plane structure, and every step having two ends separated by said rear edge portion and said front edge portion of the step; means for supporting the steps by one another, comprising sets of spindles interconnecting the rear edge portion of one step with the front edge portion of the next upper step, each set comprising two spindles, one adjacent each end of the one step; means for anchoring the steps to a wall, comprising a number of rigid bars, no greater than the number of steps in said plurality of steps, regularly distributed relative to the plurality of steps, each bar having a generally rectangular cross section smaller than and parallel to that of a step and each bar laterally extending from the respective step; and means for firmly securing each rigid bar, along a side of its rectangular rectangular cross-section, to a lower surface of a step.
Claim 7
Dependent Claim
208 words
A flight of steps, comprising; a plurality of rigid steps upwardly spaced from one another and forwardly following one another, every step but the uppermost one having a rear edge portion overlapped by a front edge portion of the next upper step, the uppermost step having a rear edge portion disposed to overlap a front edge portion of a top plane structure, and every step having two ends separated by said rear edge portion and said front edge portion of the step; means for supporting the steps by one another, comprising sets of spindles interconnecting the rear edge portion of one step with the front edge portion of the next upper step, each set comprising two spindles, one adjacent each end of the one step; means for anchoring the steps to a wall, comprising a number of rigid bars, no greater than the number of steps in said plurality of steps, regularly distributed relative to the plurality of steps, each bar having a generally rectangular cross section smaller than and parallel to that of a step and each bar laterally extending from the respective step; and means for firmly securing each rigid bar, along a side of its rectangular rectangular cross-section, to a lower surface of a step.
Claim 8
Dependent Claim
29 words
A flight of steps according to claim 5 in which the number of rigid bars is sUbstantially one-half the number of steps, said bars being secured to alternate steps.
Claim 9
Dependent Claim
37 words
A flight of steps according to claim 5 in which every step has a cross-section which is approximately rectangular and has a ratio of width to thickness from about 2 to 1 to about 3 to 1.
Claim 10
Dependent Claim
215 words
A flight of steps, comprising; a number of rigid steps upwardly spaced from one another and forwardly following one another, every step having two ends, every step but the upper-most one having, between said ends, a rear edge portion overlapped by a front edge portion of the next upper step, and the uppermost step having a rear edge portion disposed to overlap a front edge portion of a top plane structure; means for supporting the steps by one another, comprising sets of spindles interconnecting the rear edge portion of one step with the front edge portion of the next upper step, each set including a pair of spindles, one adjacent each end of the one step; and means for anchoring the steps to a wall, comprising a number of rigid bars at most equal to the number of steps and regularly distributed relative to the steps, each bar having a cross section smaller than that of a step, having a portion rigidly secured to one of the ends of the step and a portion laterally projecting from the step, and each of said rigid bars having a bore, one of said spindles extending through the bore; and means for attaching the one spindle and the bar to the step in the area of said bore.
Claim 11
Dependent Claim
215 words
A flight of steps, comprising; a number of rigid steps upwardly spaced from one another and forwardly following one another, every step having two ends, every step but the upper-most one having, between said ends, a rear edge portion overlapped by a front edge portion of the next upper step, and the uppermost step having a rear edge portion disposed to overlap a front edge portion of a top plane structure; means for supporting the steps by one another, comprising sets of spindles interconnecting the rear edge portion of one step with the front edge portion of the next upper step, each set including a pair of spindles, one adjacent each end of the one step; and means for anchoring the steps to a wall, comprising a number of rigid bars at most equal to the number of steps and regularly distributed relative to the steps, each bar having a cross section smaller than that of a step, having a portion rigidly secured to one of the ends of the step and a portion laterally projecting from the step, and each of said rigid bars having a bore, one of said spindles extending through the bore; and means for attaching the one spindle and the bar to the step in the area of said bore.
Claim 12
Dependent Claim
33 words
A flight of steps according to claim 8 wherein each of said rigid bars is clamped directly to a lower surface of a step having such a bar, by the one respective spindle.
Claim 13
Dependent Claim
23 words
A flight of steps according to claim 9 including resilient insert means interposed between each of said rigid bars and its associated step.
Claim 14
Dependent Claim
92 words
A flight of steps according to claim 10 wherein said spindles and said means for attaching one spindle to a step have intermeshing threads, and each of said resilient insert means is a pad of such thickness and elasticity that when normal loads are applied to the respective threads the insert is not compressed to its limit, and that when particularly high loads are applied the pad is compressed to such an extent that the free length of the anchoring element is shortened to the distance of the step from the wall.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |