US3684324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivot structure for cantilevered crane boom
Assignee: Kidde Inc
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Filing: 1970-12-15
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Granted: 1972-08-15
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Expires: 1990-12-15
Abstract
Abstract The boom support of a mobile crane features a pivot structure which is capable of withstanding the heavy impact forces transmitted through the cantilevered boom. The improved pivot structure embodies journal blocks secured to side plates of the boom support and separable journal caps mountable upon the blocks when the main pivot shaft of the boom is in place. The heavy forces at the pivot tending to pull the journal blocks from the boom support are resisted by long tension bolts whose inherent elasticity is utilized to absorb shock loads. The tension bolts are anchored to the side plates of the boom support by anchor blocks which are in turn secured by sturdy shear bolts.
Inventors
- 👤 Russell L Sterner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 06:35
CPC Classifications
F; F16; F16C; F16C11/00; F16C11/04; B; B66; B66C; B66C23/00; B66C23/62; E; E02; E02F; E02F9/00; E02F9/006; Y; Y10; Y10T; Y10T403/00; Y10T403/32; Y10T403/32606; Y10T403/32861; Y10T403/32877
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
181 words
In a support structure for a cantilevered crane boom, a pair of laterally spaced upstanding plates forming parts of a turntable mounted crane boom support, a journal block mounted upon each plate and having a shaft seat, a separable journal cap mountable upon each journal block, a main pivot shaft for a cantilevered crane boom secured to the boom near its face and having shaft end portions projecting beyond opposite sides of the boom and engaging within the seats of said journal blocks, anchor means secured to each plate substantially below the journal blocks and projecting beyond the opposite sides of each plate, the journal blocks, journal caps and anchor means having aligned openings formed therethrough substantially vertically on the opposite sides of the upstanding plates, and substantially vertical long tension bolts engaging through said aligned openings on opposite sides of said plates and carrying nuts which are adjustable to regulate the tension of said bolts, the bottom faces of said anchor means being engaged by the tension bolts and the anchor means resisting the tension forces transmitted through said bolts.
Claim 2
Dependent Claim
181 words
In a support structure for a cantilevered crane boom, a pair of laterally spaced upstanding plates forming parts of a turntable mounted crane boom support, a journal block mounted upon each plate and having a shaft seat, a separable journal cap mountable upon each journal block, a main pivot shaft for a cantilevered crane boom secured to the boom near its face and having shaft end portions projecting beyond opposite sides of the boom and engaging within the seats of said journal blocks, anchor means secured to each plate substantially below the journal blocks and projecting beyond the opposite sides of each plate, the journal blocks, journal caps and anchor means having aligned openings formed therethrough substantially vertically on the opposite sides of the upstanding plates, and substantially vertical long tension bolts engaging through said aligned openings on opposite sides of said plates and carrying nuts which are adjustable to regulate the tension of said bolts, the bottom faces of said anchor means being engaged by the tension bolts and the anchor means resisting the tension forces transmitted through said bolts.
Claim 3
Dependent Claim
25 words
The structure of claim 1 and said anchor means comprising a pair of separately formed anchor blocks secured to opposite sides of each upstanding plate.
Claim 4
Dependent Claim
39 words
The structure of claim 2 and plural substantially horizontal shear bolts extending through each upstanding plate and the anchor blocks on the opposite sides of each plate and being disposed substantially at right angles to said long tension bolts.
Claim 5
Dependent Claim
66 words
The structure of claim 3 and said tension bolts including a laterally spaced pair of tension bolts on opposite sides of each upstanding plate, said plural shear bolts including pairs of shear bolts arranged substantially in a horizontal row near the lower ends of the tension bolts and with the shear bolts of each pair on opposite sides of the tension bolts in straddling relation thereto.
Claim 6
Dependent Claim
54 words
The structure of claim 1 and each upstanding plate provided in its upper edge with a notch, each journal block seated within one of said notches and projecting on opposite sides of the upstanding plate and welded to the opposite sides of the plate substantially around the margins of the notch in said plate.
Claim 7
Dependent Claim
28 words
The structure of claim 1 and journal bushings engaging telescopically over said shaft end portions and lying between the shaft end portions and said journal blocks and caps.
Claim 8
Dependent Claim
51 words
The structure of claim 6 and radial flanges on the interior ends of said bushings and disposed between the sides of the crane boom and the inner sides of the journal blocks and serving as thrust bearings and maintaining the boom centered with respect to the upstanding plates and journal blocks.
Claim 9
Dependent Claim
39 words
The structure of claim 7 and a keying means interconnecting each bUshing and the adjacent shaft journal and resisting rotation of the bushing relative to the journal and assuring that the shaft end portions will turn within the bushings.
Claim 10
Dependent Claim
116 words
The structure of claim 1 and said crane boom including a lower side box projection near its base, the main pivot shaft extending transversely through said box projection and the box projection engaging between the upstanding plates and journal blocks, an interior anchor block within said box projection near the transverse center of the boom, and a locking pin engaging through the box projection, interior anchor block and said main pivot shaft to lock the main pivot shaft to the boom so that it will pivot with the boom and will be held against axial displacement relative to the boom, said pivot shaft, interior anchor block and box projection having registering openings for said locking pin.
Claim 11
Dependent Claim
30 words
The structure of claim 4 and said nuts on the long tension bolts being on the lower ends of the tension bolts below the bottom faces of said anchor blocks.
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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) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |