Patent US4406048A successfully refreshed from Google Patents.
US4406048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of assembling ladder construction
Assignee: ACTIVITY PROPERTIES Pty Ltd
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Filing: 1980-04-03
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Granted: 1983-09-27
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Expires: 2000-04-03
Abstract
Abstract This invention relates to a method of forming a step to stile joint in a ladder which does not utilize mechanical fastenings such as rivets and the like. According to this invention, the step is provided with integral hollow sections extending therealong which protrude from each end and which pass through apertures in the stiles and are adapted to be swage connected thereto.
Inventors
- 👤 William Bailey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:17
CPC Classifications
E; E06; E06C; E06C7/00; E06C7/08; E06C7/082; E06C7/085; B; B21; B21D; B21D39/00; B21D39/06; B21D39/063; B23; B23P; B23P11/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49833; Y10T29/49835; Y10T29/49908; Y10T29/49915; Y10T29/4992; Y10T29/49938; Y10T29/4994; Y10T29/53; Y10T29/5343; Y10T29/53709; Y10T29/53717; Y10T29/53726; Y10T29/53765; Y10T403/00; Y10T403/49; Y10T403/4974
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
111 words
A method of assembling a ladder, said ladder including a plurality of metal steps and a pair of opposing metal stiles, each said step having opposite end portions of hollow sectional form and each stile having a substantially unperforated web; said method comprising the steps of forcing the hollow end portions of at least one step simultaneously through each of said stile webs to simultaneously punch apertures therein and cause said end portions to pass through said stile webs and protrude beyond said stile webs and thereafter simultaneously securing the protruding end portions of at least one of said steps to said stiles whereby each step is joined to each stile.
Claim 2
Independent Claim
111 words
A method of assembling a ladder, said ladder including a plurality of metal steps and a pair of opposing metal stiles, each said step having opposite end portions of hollow sectional form and each stile having a substantially unperforated web; said method comprising the steps of forcing the hollow end portions of at least one step simultaneously through each of said stile webs to simultaneously punch apertures therein and cause said end portions to pass through said stile webs and protrude beyond said stile webs and thereafter simultaneously securing the protruding end portions of at least one of said steps to said stiles whereby each step is joined to each stile.
Claim 3
Dependent Claim
18 words
A method according to claim 1 wherein said protruding end portions are secured to said stiles by swaging.
Claim 4
Dependent Claim
32 words
A method according to claim 1 wherein each step includes an integral longitudinally extending hollow section and wherein said step hollow end portions comprise the opposite end portions of said hollow section.
Claim 5
Dependent Claim
24 words
A method according to claim 3 wherein said step includes a pair of laterally spaced hollow sections each defining respective said hollow end portions.
Claim 6
Dependent Claim
40 words
A method according to claim 4 wherein said hollow sections are interconnected by web means said web means being cut away adjacent the said end portions to define a transverse shoulder and said end portions projecting outwardly beyond said shoulder.
Claim 7
Dependent Claim
27 words
A method according to claim 5 wherein said steps and said stiles are formed as aluminium extrusions of channel section and wherein said hollow sections are rectangular.
Claim 8
Dependent Claim
18 words
A method according to claim 3 wherein said hollow end portions are secured to said stiles by swaging.
Claim 9
Dependent Claim
18 words
A method according to claim 5 wherein said hollow end portions are secured to said stiles by swaging.
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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) | 1986-09-26 | 1987-03-28 | 1987-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-26 | 1991-03-28 | 1991-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-26 | 1995-03-28 | 1995-09-27 | $7700.00 | Window Closed / Lapsed |