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US3662907A
Expired / Lapsed
US
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Device for actuating a swingable boom
Assignee: Furukawa Co Ltd
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Filing: 1970-04-17
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Granted: 1972-05-16
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Expires: 1990-04-17
Abstract
Abstract A device for actuating the swingable boom of a truck crane. The boom is swingably supported at the top of a hollow post secured to a crane truck. A pair of series connected hydraulic cylinders are disposed between the boom and the hollow post, while guiding the movement of the hydraulic cylinders by the hollow space of the post. Thereby, when the boom is actuated by the hydraulic cylinders, the hydraulic cylinders are prevented from moving toward a baggage frame of the crane truck and from reducing the effective floor space of the baggage frame.
Inventors
- 👤 Toshihiro Nakajo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:46
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/82; B66C23/18; B66C23/36; B66C23/42
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
178 words
A device for actuating the swingable boom of a truck crane mounted on a truck, comprising a hollow vertical post secured to a stationary portion of the truck for pivotally supporting the boom, the hollow post having a top end being bent away from the longitudinal vertical axis of the post and supporting a base portion of the boom in a manner swingable about an axis located in the bent top end, a first hydraulic cylinder being secured to the stationary portion of the truck at one end thereof and extending substantially vertically through the hollow post, a second hydraulic cylinder having one end pivotally secured to the opposite end of the first hydraulic cylinder while having the opposite end thereof connected to the base portion of the swingable boom, and a link rotatably connecting the joint between the first and second hydraulic cylinders to said axis of the swing of the boom in the bent top end of the vertical post, whereby the first hydraulic cylinder is held substantially vertical throughout the swinging operation of the boom.
Claim 2
Independent Claim
178 words
A device for actuating the swingable boom of a truck crane mounted on a truck, comprising a hollow vertical post secured to a stationary portion of the truck for pivotally supporting the boom, the hollow post having a top end being bent away from the longitudinal vertical axis of the post and supporting a base portion of the boom in a manner swingable about an axis located in the bent top end, a first hydraulic cylinder being secured to the stationary portion of the truck at one end thereof and extending substantially vertically through the hollow post, a second hydraulic cylinder having one end pivotally secured to the opposite end of the first hydraulic cylinder while having the opposite end thereof connected to the base portion of the swingable boom, and a link rotatably connecting the joint between the first and second hydraulic cylinders to said axis of the swing of the boom in the bent top end of the vertical post, whereby the first hydraulic cylinder is held substantially vertical throughout the swinging operation of the boom.
Claim 3
Dependent Claim
24 words
A device according to claim 1, wherein said hollow post is disposed between a driver''s seat and a baggage frame of the crane truck.
Claim 4
Dependent Claim
29 words
A device according to claim 2, wherein the top portion of the hollow post pivotally supporting the base portion of the boom is bent away from the baggage frame.
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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |