Patent US3908260A successfully refreshed from Google Patents.
US3908260A
Expired / Lapsed
US
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Method of making a truck ladder
Assignee: Individual
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Filing: 1974-10-29
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Granted: 1975-09-30
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Expires: 1994-10-29
Abstract
Abstract Two pairs of transversely-aligned longitudinally-spaced veebottomed notches are formed in the opposite edges of the midportion of an elongated flat sheet metal blank, the opposite edge portions of which are then bent perpendicular to the central portion thereof to form an elongated channel member. This channel member is then bent transversely along the center lines of each pair of notches to form a top step integral with two parallel side rails which are then interconnected at and above their lower ends by a pair of fixed channel steps secured thereto in vertically-spaced parallel relationship. A wider foldable step is pivotally mounted on the side rails below the top step and carries a pair of centrally-bored attachment pins which initially guide a drill in drilling pilot holes in the truck body side wall for subsequent enlargement to receive the attachment pins which then secure the ladder to the truck body.
Inventors
- 👤 Charles M Loomis
- 👤 Gerald M Loomis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:11
CPC Classifications
E; E06; E06C; E06C5/00; E06C5/02; E06C7/00; E06C7/08; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/4984; Y10T29/49895
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
200 words
A method of making a multiple-step ladder adapted to be attached to a truck body, said method comprising forming from sheet metal an elongated parallel-edged blank, forming two pairs of transversely-aligned vee-bottomed notches in the opposite edge portions of said blank, said pairs of notches being formed equidistant from the opposite ends of said blank at locations corresponding to the intended locations of the ends of the top step of the ladder, bending the thus-notched opposite edge portions of said blank perpendicular to the remainder thereof along parallel longitudinal bending lines through the centers of said notches to form a channel member having a central wall and parallel side walls, bending said channel member along transverse bending lines through each pair of said transversely-aligned notches into a central top step member and a pair of parallel ladder side members perpendicular to said top step member and integral therewith, preparing a plurality of lower step members with lengths corresponding substantially to the distance between said central walls of said opposite side members, and securing the opposite end portions of said lower step members to said opposite side members within the channels thereof and in spaced parallel relationship to said top member.
Claim 2
Independent Claim
200 words
A method of making a multiple-step ladder adapted to be attached to a truck body, said method comprising forming from sheet metal an elongated parallel-edged blank, forming two pairs of transversely-aligned vee-bottomed notches in the opposite edge portions of said blank, said pairs of notches being formed equidistant from the opposite ends of said blank at locations corresponding to the intended locations of the ends of the top step of the ladder, bending the thus-notched opposite edge portions of said blank perpendicular to the remainder thereof along parallel longitudinal bending lines through the centers of said notches to form a channel member having a central wall and parallel side walls, bending said channel member along transverse bending lines through each pair of said transversely-aligned notches into a central top step member and a pair of parallel ladder side members perpendicular to said top step member and integral therewith, preparing a plurality of lower step members with lengths corresponding substantially to the distance between said central walls of said opposite side members, and securing the opposite end portions of said lower step members to said opposite side members within the channels thereof and in spaced parallel relationship to said top member.
Claim 3
Dependent Claim
48 words
A method of making a multiple-step ladder, according to claim 1, wherein said vee-bottomed notches have parallel outer edge portions, and wherein said bending of said opposite edge portions is performed on bending lines passing through the junctions of said vee-bottomed notch portions and said parallel edge portions.
Claim 4
Dependent Claim
36 words
A method of making a multiple-step ladder, according to claim 2, including the additional step of bending the outer longitudinal edge portions of said side walls toward one another into co-planar flanges with a gap therebetween.
Claim 5
Dependent Claim
27 words
A method of making a multiple-step ladder, according to claim 1, including the additional step of fixedly securing said lower step members to said opposite side members.
Claim 6
Dependent Claim
46 words
A method of making a multiple-step ladder, according to claim 3, including the additional step of inserting the opposite ends of said lower step members through the gaps in their respective adjacent side members, and also through the parallel-edged outer portions of their respective adjacent notches.
Claim 7
Dependent Claim
42 words
A method of making a multiple-step ladder, according to claim 1, including the additional step of pivotally mounting an upper step member on said opposite side members for tilting motion between positions respectively co-planar with and perpendicular to said opposite side members.
Claim 8
Dependent Claim
41 words
A method of making a multiple-step ladder, according to claim 6, including the additional step of mounting truck body attachment elements upon said upper step member in projecting relationship therewith, said elements being adapted to be secured to the truck body.
Claim 9
Dependent Claim
49 words
A method of making a multiple-step ladder, according to claim 7, including the additional step of providing drill guide bores in said attachment elements adapted to precisely align a rotary drill while drilling pilot holes in the truck body for subsequent enlargement into fastener holes for ladder supporting fasteners.
Claim 10
Dependent Claim
36 words
A method of making a multiple-step ladder, according to claim 1, including the additional step of forming said lower step members in channel configuration prior to securing said lower step members to said opposite side members.
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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) | 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 |