US3690742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crane boom
Assignee: Kidde Inc
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Filing: 1971-11-19
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Granted: 1972-09-12
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Expires: 1991-11-19
Abstract
Abstract A telescoping crane boom includes interfitting box sections fabricated by welding from plate stock. The side webs of the individual box sections are spaced inwardly from the longitudinal edges of the top and bottom webs, to allow placement of bearing pads substantially directly over and under the side webs of each box section in a multiple section boom. As a result, the side webs of the box sections are utilized as columns to absorb the heavy stresses transmitted through the wear pads and transverse stressing and flexure of the top and bottom webs is greatly minimized. The arrangement allows considerably lighter sections to be employed for the top and bottom webs of the individual box sections without fear of excessive transverse bending.
Inventors
- 👤 Fu-Tien Sung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:37
CPC Classifications
F; F16; F16C; F16C29/00; F16C29/02; B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/707; F16C2326/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
120 words
In an extensible telescoping crane boom, a pair of telescopically interfitting rectangular box-like boom sections each having vertical side webs and top and bottom webs, and upper and lower pairs of wear pads interposed between the top webs of the two boom sections and the bottom webs thereof, the wear pads of the upper and lower pairs being substantially in vertical alignment and also located substantially directly above and below said vertical side webs of the interior boom section for transmitting forces directly thereto, the side webs functioning substantially as columns to absorb said forces, and means to retain the upper wear pads on the interior boom section and to retain the lower wear pads on the exterior boom section.
Claim 2
Dependent Claim
120 words
In an extensible telescoping crane boom, a pair of telescopically interfitting rectangular box-like boom sections each having vertical side webs and top and bottom webs, and upper and lower pairs of wear pads interposed between the top webs of the two boom sections and the bottom webs thereof, the wear pads of the upper and lower pairs being substantially in vertical alignment and also located substantially directly above and below said vertical side webs of the interior boom section for transmitting forces directly thereto, the side webs functioning substantially as columns to absorb said forces, and means to retain the upper wear pads on the interior boom section and to retain the lower wear pads on the exterior boom section.
Claim 3
Dependent Claim
46 words
The structure of claim 1, and said means comprising a separate element to retain the upper wear pads on the top web of the interior boom section and another element to retain the lower wear pads adjacent to the bottom web of the exterior boom section.
Claim 4
Dependent Claim
75 words
The structure of claim 2, and the first-named element comprising a reinforcing plate secured to the top web of the interior boom section and having spaced openings to receive and retain the upper wear pads, the second-named element comprising a transverse reinforcer for the bottom web of the exterior boom section, said reinforcer underlying the lower wear pads, the bottom web of the exterior boom section notched to receive and retain the lower wear pads.
Claim 5
Dependent Claim
59 words
The structure of claim 1, and said means to retain the upper wear pads on the interior boom section comprising a pair of opposed substantially right angular retainers for the upper bearing pads on the upper corners of the interior boom section including vertical portions which also function as side wear plates between the interior and exterior boom sections.
Claim 6
Dependent Claim
49 words
The structure of claim 4, and said right angular retainers recessed in their tops to receive the upper wear pads and having separate vertical side plate elements serving to close the outer ends of said recesses and lying immediately inwardly of the vertical webs of the exterior boom section.
Claim 7
Dependent Claim
40 words
The structure of claim 1, and each box-like boom section comprising upper and lower webs and substantially right angular vertical side webs which are spaced inwardly from the longitudinal edges of the upper and lower webs and secured thereto rigidly.
Claim 8
Dependent Claim
17 words
The structure of claim 6, and the upper and lower and side webs secured rigidly by welding.
Claim 9
Dependent Claim
119 words
In an extensible telescoping crane boom, a pair of telescopically interfitting boom sections each having side webs and a top and bottom web, and upper and lower pairs of wear pads interposed between and being substantially parallel with the top webs of the two boom sections and the bottom webs thereof, the improvement comprising the wear pads of the upper and lower pairs being located substantially directly above and below said side webs of the interior boom section for transmitting forces directly thereto, the side webs functioning substantially as columns to absorb said forces, and means to retain the upper wear pads on the interior boom section and to retain the lower wear pads on the exterior boom section.
Claim 10
Dependent Claim
119 words
In an extensible telescoping crane boom, a pair of telescopically interfitting boom sections each having side webs and a top and bottom web, and upper and lower pairs of wear pads interposed between and being substantially parallel with the top webs of the two boom sections and the bottom webs thereof, the improvement comprising the wear pads of the upper and lower pairs being located substantially directly above and below said side webs of the interior boom section for transmitting forces directly thereto, the side webs functioning substantially as columns to absorb said forces, and means to retain the upper wear pads on the interior boom section and to retain the lower wear pads on the exterior boom section.
Claim 11
Dependent Claim
34 words
An extensible telescoping crane boom as set forth in claim 8 in which said wear pads of the upper and lower pairs are respectively arranged in alignment with the planes of said side webs.
References Cited (Backward Citations)
US3481490A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-12 | 1976-03-13 | 1976-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-12 | 1980-03-13 | 1980-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-12 | 1984-03-13 | 1984-09-12 | $7700.00 | Window Closed / Lapsed |