US3719404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crane boom having universally swiveled wear pads
Assignee: Kidde Inc
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Filing: 1970-11-17
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Granted: 1973-03-06
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Expires: 1990-11-17
Abstract
Abstract The lower wear pads of multi-section telescoping crane booms comprise assemblies located on the forward end and bottom of each boom section. Each such assembly consists of a support housing for a pair of laterally spaced wear pad units and within the support housing are retainer means for each wear pad unit. Each unit includes low friction wear pad elements for direct frictional engagement with the bottom face of the next innermost boom section and spherically curved universally self-adjusting seating means for the wear pad elements.
Inventors
- 👤 R Sterner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:46
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/707; F; F16; F16C; F16C29/00; F16C29/02; F16C2326/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
137 words
In a telescoping crane boom, first and second telescoping boom sections having bottom surfaces disposed in close proximity to each other, means forming a support housing for laterally spaced wear pad units on the forward end and bottom of the first boom section, said support housing located beneath the bottom surface of said first boom section, laterally spaced spherically curved universally self-adjusting bearing means in said support housing and located below the bottom surface of the first boom section, and wear pad devices resting on said universally selfadjusting bearing means and extending upwardly through apertures in the bottom surface of said first boom section and engaging the bottom surface of said second boom section in complete seating engagement as the angularity between said first and second boom sections changes during telescopic movement of the second boom section.
Claim 2
Dependent Claim
137 words
In a telescoping crane boom, first and second telescoping boom sections having bottom surfaces disposed in close proximity to each other, means forming a support housing for laterally spaced wear pad units on the forward end and bottom of the first boom section, said support housing located beneath the bottom surface of said first boom section, laterally spaced spherically curved universally self-adjusting bearing means in said support housing and located below the bottom surface of the first boom section, and wear pad devices resting on said universally selfadjusting bearing means and extending upwardly through apertures in the bottom surface of said first boom section and engaging the bottom surface of said second boom section in complete seating engagement as the angularity between said first and second boom sections changes during telescopic movement of the second boom section.
Claim 3
Dependent Claim
137 words
In a telescoping crane boom, first and second telescoping boom sections having bottom surfaces disposed in close proximity to each other, means forming a support housing for laterally spaced wear pad units on the forward end and bottom of the first boom section, said support housing located beneath the bottom surface of said first boom section, laterally spaced spherically curved universally self-adjusting bearing means in said support housing and located below the bottom surface of the first boom section, and wear pad devices resting on said universally self-adjusting bearing means and extending upwardly through apertures in the bottom surface of said first boom section and engaging the bottom surface of said second boom section in complete seating engagement as the angularity between said first and second boom sections changes during telescopic movement of the second boom section.
Claim 4
Dependent Claim
137 words
In a telescoping crane boom, first and second telescoping boom sections having bottom surfaces disposed in close proximity to each other, means forming a support housing for laterally spaced wear pad units on the forward end and bottom of the first boom section, said support housing located beneath the bottom surface of said first boom section, laterally spaced spherically curved universally self-adjusting bearing means in said support housing and located below the bottom surface of the first boom section, and wear pad devices resting on said universally self-adjusting bearing means and extending upwardly through apertures in the bottom surface of said first boom section and engaging the bottom surface of said second boom section in complete seating engagement as the angularity between said first and second boom sections changes during telescopic movement of the second boom section.
Claim 5
Dependent Claim
70 words
The structure of claim 1, and said bearing means in said support housing comprising bearing block elements having top spherically curved recesses, means anchoring the bearing blocks to said support housing below said bottom surface of said first boom section, coacting self-adjusting spherically curved swivel devices on said bearing blocks, and flat faced wear pad elements on the swivel devices frictionally engaging said bottom surface of said second boom section.
Claim 6
Dependent Claim
136 words
In a telescoping crane boom, first and second telescoping boom sections, means forming a support for laterally spaced wear pad units on the forward end and bottom of the first boom section comprising a reinforcing collar on the forward end of said first boom section including a transverse channel member connected beneath the bottom surface of said first boom section, laterally spaced spherically curved universally self-adjusting bearing means secured within opposite end portions of said channel member and located below the bottom surface of the first boom section, and wear pad devices resting on said universally self-adjusting bearing means and extending upwardly through apertures in the bottom surface of said first boom section and engaging the bottom surface of the second boom section disposed in close proximity to the bottom surface of the first boom section.
Claim 7
Dependent Claim
136 words
In a telescoping crane boom, first and second telescoping boom sections, means forming a support for laterally spaced wear pad units on the forward end and bottom of the first boom section comprising a reinforcing collar on the forward end of said first boom section including a transverse channel member connected beneath the bottom surface of said first boom section, laterally spaced spherically curved universally self-adjusting bearing means secured within opposite end portions of said channel member and located below the bottom surface of the first boom section, and wear pad devices resting on said universally self-adjusting bearing means and extending upwardly through apertures in the bottom surface of said first boom section and engaging the bottom surface of the second boom section disposed in close proximity to the bottom surface of the first boom section.
Claim 8
Dependent Claim
64 words
The structure of claim 3, and said bearing means comprising fixed bearing blocks within the opposite end portions of the channel member and having top spherically curved seats, spherically curved swivel plates engaging said seats and adapted to swivel freely thereon universally, and wear pad devices resting on the tops of said swivel plates and underlying said bottom surface of said second boom section.
Claim 9
Dependent Claim
36 words
The structure of claim 4, and each wear pad device comprising a wear pad retainer block having plural retainer recesses in its top face, and a correspondiNg number of wear pads mounted within the retainer recesses.
Claim 10
Dependent Claim
16 words
The structure of claim 5, and said wear pads comprising plate-like elements having flat top faces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-05 | 1976-09-04 | 1977-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-05 | 1980-09-04 | 1981-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-05 | 1984-09-04 | 1985-03-06 | $7700.00 | Window Closed / Lapsed |