Patent US3404884A successfully refreshed from Google Patents.
Patent US4548293A successfully refreshed from Google Patents.
US4548293A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bin ladder construction
Assignee: CTB IP Inc
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Filing: 1984-07-13
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Granted: 1985-10-22
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Expires: 2004-07-13
Abstract
Abstract A bin ladder construction includes a vertical ladder up the side of a grain storage bin and an inclined ladder from the upper end of the vertical ladder to the peak of the roof of the grain storage bin. Corner pieces of particular shape and configuration interconnect the inclined and vertical ladders. The ladders have hollow rungs open at both ends, and channel members extend through and beyond the ends of a pair of hollow rungs in the vertical ladder and in the inclined ladder. Triangular brackets mount the opposite ends of hand rails to the ends of said channels.
Inventors
- 👤 Alvin D. Haab
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:33
CPC Classifications
E; E06; E06C; E06C9/00; E06C9/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
157 words
A ladder construction comprising a substantially vertical ladder section and an inclined ladder section, each of said ladder sections comprising a pair of longitudinally extending channel-shaped side rails each having a central web and side flanges, interconnected by a plurality of transversely extending hollow rungs open at both ends, a pair of corner pieces interconnecting said substantially vertical ladder section and said inclined ladder section and each including a planar body section lying coplanar with said ladder rail webs and having extending therefrom a pair of offset flanges lying between respective ladder rail flanges and against respective webs and secured to said rails, a pair of hand rails extending up from said substantially vertical ladder section and overlying said inclined ladder section, and a pair of elongated hand rail mounting members extending through and beyond respective hollow rungs in said substantially vertical ladder section and said inclined ladder section and on which said hand rails are mounted.
Claim 2
Dependent Claim
157 words
A ladder construction comprising a substantially vertical ladder section and an inclined ladder section, each of said ladder sections comprising a pair of longitudinally extending channel-shaped side rails each having a central web and side flanges, interconnected by a plurality of transversely extending hollow rungs open at both ends, a pair of corner pieces interconnecting said substantially vertical ladder section and said inclined ladder section and each including a planar body section lying coplanar with said ladder rail webs and having extending therefrom a pair of offset flanges lying between respective ladder rail flanges and against respective webs and secured to said rails, a pair of hand rails extending up from said substantially vertical ladder section and overlying said inclined ladder section, and a pair of elongated hand rail mounting members extending through and beyond respective hollow rungs in said substantially vertical ladder section and said inclined ladder section and on which said hand rails are mounted.
Claim 3
Dependent Claim
34 words
A ladder construction as set forth in claim 1 and further including a plurality of triangular brackets respectively mounting the ends of said hand rails on the ends of said hand rail mounting members.
Claim 4
Dependent Claim
55 words
A ladder construction as set forth in claim 1 and further including a second pair of corner pieces the same as said first mentioned pair of corner pieces, said second pair of corner pieces being secured to the upper ends of said inclined ladder section and to mounting brackets for securing said inclined ladder section.
Claim 5
Dependent Claim
55 words
A ladder construction as set forth in claim 2 and further including a second pair of corner pieces the same as said first mentioned pair of corner pieces, said second pair of corner pieces being secured to the upper ends of said inclined ladder section and to mounting brackets for securing said inclined ladder section.
Claim 6
Dependent Claim
45 words
A ladder construction as set forth in claim 1 wherein each of said corner pieces further has a curved flange on said planar body section extending in smooth transition between like side rail flanges of said substantially vertical ladder section and said inclined ladder section.
Claim 7
Dependent Claim
19 words
A ladder construction as set forth in claim 1 wherein said elongated hand rail mounting members comprise channel-shaped members.
Claim 8
Dependent Claim
56 words
A ladder construction as set forth in claim 4 wherein each of said corner pieces has a curved flange on said planar body providing a smooth transition between like flanges on said side rails of said substantially vertical ladder section and said inclined ladder section, and wherein said elongated hand rail mounting members comprise channel-shaped members.
Claim 9
Dependent Claim
99 words
A ladder construction comprising a substantially vertical ladder section and an inclined ladder section, each of said ladder sections comprising a pair of longitudinally extending channel-shaped side rails each having a central web and side flanges, interconnected by a plurality of transversely extending rungs, and a pair of corner pieces interconnecting said substantially vertical ladder section and said inclined ladder section and each including a planar body section lying coplanar with said ladder rail webs and having extending therefrom a pair of offset flanges lying between respective ladder rail flanges and against respective webs and secured to said rails.
Claim 10
Dependent Claim
99 words
A ladder construction comprising a substantially vertical ladder section and an inclined ladder section, each of said ladder sections comprising a pair of longitudinally extending channel-shaped side rails each having a central web and side flanges, interconnected by a plurality of transversely extending rungs, and a pair of corner pieces interconnecting said substantially vertical ladder section and said inclined ladder section and each including a planar body section lying coplanar with said ladder rail webs and having extending therefrom a pair of offset flanges lying between respective ladder rail flanges and against respective webs and secured to said rails.
Claim 11
Dependent Claim
45 words
A ladder construction as set forth in claim 8 wherein each of said corner pieces further has a curved flange on said planar body section extending in smooth transition between like side rail flanges of said substantially vertical ladder section and said inclined ladder section.
Claim 12
Dependent Claim
55 words
A ladder construction as set forth in claim 8 and further including a second pair of corner pieces the same as said first mentioned pair of corner pieces, said second pair of corner pieces being secured to the upper ends of said inclined ladder section and to mounting brackets for securing said inclined ladder section.
Claim 13
Dependent Claim
55 words
A ladder construction as set forth in claim 9 and further including a second pair of corner pieces the same as said first mentioned pair of corner pieces, said second pair of corner pieces being secured to the upper ends of said incined ladder section and to mounting brackets for securing said inclined ladder section.
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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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |