Patent US3776513A successfully refreshed from Google Patents.
US3776513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crane
Assignee: Individual
•
Filing: 1971-05-10
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Granted: 1973-12-04
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Expires: 1991-05-10
Abstract
Abstract A crane is provided with winch drums for hoisting and closing the bucket or grapple and for a dragline, and mechanisms for lifting and swinging the boom. All operated by hydraulic motors each controlled by single lever actuated valves so as to be readily manipulated by a semi-skilled operator. The mentioned winch drums are powered through special differential gear trains and hydraulic systems such that the single control lever for each kind of motion may power the bucket in either direction or release its cable for rapid pay out.
Inventors
- 👤 F Mosley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:03
CPC Classifications
B; B66; B66C; B66C3/00; B66C3/12; B66C3/125
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
254 words
In a crane, an hydraulic pressure source, a winch having a drum, a winch motor having reversible pressure and exhaust connections, a load carrying cable received about said drum, gearing interposed between said motor and said drum, said gearing being of the type incorporating brake means engagable selectively to mechanically connect said drum and said motor, for powering said drum, and to disconnect said motor and said drum for free wheeling of said drum in at least one direction, a brake motor for actuating said brake means, a valve having a pressure port connected to said source, exhaust porting, first and second motor ports, and a movable part having first, second, and third passaging, said third passaging being less restrictive than said first and second passaging, ducts connecting said motor ports individually with said motor connections and said first motor port also with said brake motor, and an element for shifting said valve part selectively to first and second positions in which said first and second passaging, alternately, connects said pressure port and exhaust porting to said motor connections for reversed powering of said winch motor and said drum, and to a third position in which said third passaging connects said pressure port with said first motor port, the fluid pressure from said pressure source being insufficient to actuate said brake motor in said first and second positions of said element and being sufficient in said third position of said element to actuate said brake motor and thereby cause free wheeling of said drum.
Claim 2
Dependent Claim
254 words
In a crane, an hydraulic pressure source, a winch having a drum, a winch motor having reversible pressure and exhaust connections, a load carrying cable received about said drum, gearing interposed between said motor and said drum, said gearing being of the type incorporating brake means engagable selectively to mechanically connect said drum and said motor, for powering said drum, and to disconnect said motor and said drum for free wheeling of said drum in at least one direction, a brake motor for actuating said brake means, a valve having a pressure port connected to said source, exhaust porting, first and second motor ports, and a movable part having first, second, and third passaging, said third passaging being less restrictive than said first and second passaging, ducts connecting said motor ports individually with said motor connections and said first motor port also with said brake motor, and an element for shifting said valve part selectively to first and second positions in which said first and second passaging, alternately, connects said pressure port and exhaust porting to said motor connections for reversed powering of said winch motor and said drum, and to a third position in which said third passaging connects said pressure port with said first motor port, the fluid pressure from said pressure source being insufficient to actuate said brake motor in said first and second positions of said element and being sufficient in said third position of said element to actuate said brake motor and thereby cause free wheeling of said drum.
Claim 3
Dependent Claim
47 words
The combination described in claim 1 in which said valve actuating element is moved in the same direction to said second and third positions for operating said winch motor and drum in the direction for successive paying out of said cable and free wheeling of said drum.
Claim 4
Dependent Claim
34 words
The combination described in claim 1 in which said valve part has additional passaging and said element has a fourth position in which said additional passaging directly connects said pressure and said exhaust porting.
Claim 5
Dependent Claim
33 words
The combination described in claim 1 further including a restriction in one of said motor ducts and a check-controlled bypass therearound for cooperating with said valve to influence actuation of said brake motor.
Claim 6
Dependent Claim
27 words
The combination described in claim 1 further including pressure limiting means in one of said ducts for limiting the powering of said drum in the lifting direction.
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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) | 1976-12-03 | 1977-06-04 | 1977-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-03 | 1981-06-04 | 1981-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-03 | 1985-06-04 | 1985-12-04 | $7700.00 | Window Closed / Lapsed |