US3842985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for extending and retracting crane boom section
Assignee: CENTURY II Inc A CORP OF
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Filing: 1972-12-15
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Granted: 1974-10-22
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Expires: 1992-12-15
Abstract
Abstract Means for extending and retracting a section of a multisection telescopic crane boom that lacks its own extend-retract hydraulic cylinder are disclosed. Such means comprise a boom having a base section, an inner mid section and hydraulic cylinder therefor, an outer mid section and hydraulic cylinder therefor, a fly section and hydraulic cylinder therefor, and a manual section. Two solenoid operated tapered pins are mounted in longitudinally spaced apart relationship on the manual section. The forward pin cooperates with a forward pin hole and a rearward pin hole in the fly section. The rear pin cooperates with a pin hole in the cylinder for the outer mid section. Extending the manual section for use (assuming) all movable sections and cylinders retracted) involves: extending the fly section with the manual section pinned thereto; energizing both solenoids to unpin the manual section from the fly section and to pin the former to the outer mid cylinder; retracting the fly section; and deenergizing both solenoids to unpin the manual section (now extended) to the fly section and to unpin the manual section from the outer mid cylinder. The method of retracting the manual section is the reverse of extending it.
Inventors
- 👤 G Svede
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:07
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/708; B66C23/705
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
467 words
In a mobile crane; a vehicle, a telescopic boom pivotally mounted on said vehicle and comprising a base section, a first section telescopable within said base section; a second section telescopable within said first section, a third section telescopable within said second section and having two longitudinally spaced apart forward and rear pin holes therein, a fourth section telescopable within said third section; an extendable and retractable operating cylinder connected between said base section and said first section for extending and retracting said first section; a first extendable and retractable cylinder connected between said first section and said second section for extending and retracting said second section, said first cylinder having a pin hole therein; a second extendable and retractable cylinder connected between said second section and said third section for extending and retracting said third section; means to extend and retract each of said cylinders; a rearward remotely operated pinning means mounted on the interior of said fourth section and having a rear pin extendable for releasable engagement with said pin hole in said first cylinder; a forward remotely operated pinning means mounted on the interior of said fourth section forwardly of said rearward pinning means and having a forward pin extendable through a hole in said fourth section and releasably engageable with either of said pin holes in said third section; each of said forward and rearward pinning means comprising a solenoid for extending and retracting its pin and wherein the solenoid for said rearward pinning means is deenergizable to retract its pin and the solenoid for said forward pinning means is deenergizable to extend its pin, said rear pin normally being retracted and disengaged from said pinning hole in said first cylinder while all said sections are telescoped, said forward pin normally being extended and releasably engaged with said rear pin hole in said third section while all said sections are telescoped; said second cylinder being extendable to effect extension of said third section and said fourth section pinned thereto; means to remotely operate said forward and rearward pinning means while said third and fourth sections are extended to extend said rear pin into releasable engagement with said pin hole in said first cylinder and to retract said forward pin from engagement with said rear pin hole in said third section; said second cylinder being retractable to effect retraction of said third section while said fourth section is maintained extended by being pinned to said first cylinder; and means for energizing or deenergizing said solenoids simultaneously to remotely operate said forward and rearward pinning means while said third section is retracted to retract said rear pin from engagement with said pin hole in said first cylinder and to extend said forward pin into releasable engagement with said forward pin hole in said third section.
Claim 2
Dependent Claim
467 words
In a mobile crane; a vehicle, a telescopic boom pivotally mounted on said vehicle and comprising a base section, a first section telescopable within said base section; a second section telescopable within said first section, a third section telescopable within said second section and having two longitudinally spaced apart forward and rear pin holes therein, a fourth section telescopable within said third section; an extendable and retractable operating cylinder connected between said base section and said first section for extending and retracting said first section; a first extendable and retractable cylinder connected between said first section and said second section for extending and retracting said second section, said first cylinder having a pin hole therein; a second extendable and retractable cylinder connected between said second section and said third section for extending and retracting said third section; means to extend and retract each of said cylinders; a rearward remotely operated pinning means mounted on the interior of said fourth section and having a rear pin extendable for releasable engagement with said pin hole in said first cylinder; a forward remotely operated pinning means mounted on the interior of said fourth section forwardly of said rearward pinning means and having a forward pin extendable through a hole in said fourth section and releasably engageable with either of said pin holes in said third section; each of said forward and rearward pinning means comprising a solenoid for extending and retracting its pin and wherein the solenoid for said rearward pinning means is deenergizable to retract its pin and the solenoid for said forward pinning means is deenergizable to extend its pin, said rear pin normally being retracted and disengaged from said pinning hole in said first cylinder while all said sections are telescoped, said forward pin normally being extended and releasably engaged with said rear pin hole in said third section while all said sections are telescoped; said second cylinder being extendable to effect extension of said third section and said fourth section pinned thereto; means to remotely operate said forward and rearward pinning means while said third and fourth sections are extended to extend said rear pin into releasable engagement with said pin hole in said first cylinder and to retract said forward pin from engagement with said rear pin hole in said third section; said second cylinder being retractable to effect retraction of said third section while said fourth section is maintained extended by being pinned to said first cylinder; and means for energizing or deenergizing said solenoids simultaneously to remotely operate said forward and rearward pinning means while said third section is retracted to retract said rear pin from engagement with said pin hole in said first cylinder and to extend said forward pin into releasable engagement with said forward pin hole in said third section.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |