Patent US2774898A successfully refreshed from Google Patents.
Patent US3799197A successfully refreshed from Google Patents.
US3799197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual jack assembly for marine loading arms
Assignee: FMC Corp
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Filing: 1972-04-03
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Granted: 1974-03-26
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Expires: 1992-04-03
Abstract
Abstract A dual jack assembly for supporting the outboard end of a marine loading arm on the deck of a marine tanker to which it is connected during transfer of fluid between the tanker and a reservoir facility. The jack assembly comprises a pair of hydraulic motor-operated jacks secured to opposite ends of a saddle structure that serves the double function of attaching the assembly to the arm and transferring the arm''s moment load to the jacks. The jacks are oriented vertically, and each contains a helically threaded screw that is extended or retracted from a tubular housing in response to operation of the motor to which it is connected. The jacks are individually adjustable to compensate for different distances between the saddle structure and the tanker''s deck, and the lower end of each jack terminates in a ball joint that carries a foot-like base which adapts to the slope of the deck or other structure on which the jack is based.
Inventors
- 👤 H Gibbons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:41
CPC Classifications
B; B67; B67D; B67D9/00; B67D9/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/8807
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
119 words
A marine loading arm including a fluid-conducting boom section adapted for coupling to a manifold flange of a marine tanker, and a jack assembly mounted on the boom section for supporting the loading arm on the tanker, said jack assembly comprising: a. a pair of screw jacks, each jack having a housing, a leg extensible from and retractile into said housing, and a helical screw for extending and retracting said leg with respect to said housing; b. power means for rotating the helical screws; c. first means for securing the jacks to each other in spaced, generally parallel relationship; and d. second securing means cooperating with the first securing means to mount the jack assembly on the loading arm.
Claim 2
Dependent Claim
119 words
A marine loading arm including a fluid-conducting boom section adapted for coupling to a manifold flange of a marine tanker, and a jack assembly mounted on the boom section for supporting the loading arm on the tanker, said jack assembly comprising: a. a pair of screw jacks, each jack having a housing, a leg extensible from and retractile into said housing, and a helical screw for extending and retracting said leg with respect to said housing; b. power means for rotating the helical screws; c. first means for securing the jacks to each other in spaced, generally parallel relationship; and d. second securing means cooperating with the first securing means to mount the jack assembly on the loading arm.
Claim 3
Dependent Claim
39 words
A marine loading arm according to claim 1 wherein the power means comprises a pair of hydraulic motors, one secured to the housing of each jack, and means interconnecting each motor with the helical screw of its respective jack.
Claim 4
Dependent Claim
40 words
A marine loading arm according to claim 2 wherein the interconnecting means of each jack comprises a motor shaft rotatable with respect to the jack housing, and a screw shaft non-rotatably secured to the motor shaft and the helical screw.
Claim 5
Dependent Claim
49 words
A marine loading arm according to claim 1 wherein the first securing means comprises a rigid beam member fixed at each end to the jack housings, and a saddle member fixed to the beam member in an upwardly oriented manner when the assembly is positioned in its functional orientation.
Claim 6
Dependent Claim
42 words
A marine loading arm according to claim 4 wherein the second securing means comprises an elongated strap removably securable at each end to the jack housings, the strap cooperating with the saddle member to removably secure the assembly to the loading arm.
Claim 7
Dependent Claim
47 words
A marine loading arm according to claim 1 wherein each extensible leg has an inner and an outer end, a drive nut threaded about the screw shaft and fixed to the inner end of the leg, and a foot member pivotally connected To the leg''s outer end.
Claim 8
Dependent Claim
39 words
A marine loading arm according to claim 6 including anti-rotation guide means extending between each jack housing and its extensible leg, whereby when the screw is rotated with respect to its housing the extensible leg is prevented from rotating.
Claim 9
Dependent Claim
36 words
A marine loading arm according to claim 7 including stop means on the screw shaft cooperating with stop means on the drive nut to preclude over-extension and over-retraction of the leg with respect to the housing.
Claim 10
Dependent Claim
158 words
A dual jack assembly adapted for supporting the outboard end of a marine loading arm, comprising: a. a pair of screw jacks, each jack having a housing, a leg extensible from and retractile into said housing, and a helical screw for extending and retracting said leg with respect to said housing; b. power means for rotating the helical screws, said power means comprising a pair of hydraulic motors, one secured to the housing of each jack, and means interconnecting each motor with the helical screw of its respective jack, said motors being connected in series into a source of pressurized hydraulic fluid, said power means further comprising a variable orifice flow control means connected across the fluid inlet and outlet of each motor; c. first means for securing the jacks to each other in spaced, generally parallel relationship; and d. second securing means cooperating with the first securing means to mount the jack assembly on the loading arm.
Claim 11
Dependent Claim
158 words
A dual jack assembly adapted for supporting the outboard end of a marine loading arm, comprising: a. a pair of screw jacks, each jack having a housing, a leg extensible from and retractile into said housing, and a helical screw for extending and retracting said leg with respect to said housing; b. power means for rotating the helical screws, said power means comprising a pair of hydraulic motors, one secured to the housing of each jack, and means interconnecting each motor with the helical screw of its respective jack, said motors being connected in series into a source of pressurized hydraulic fluid, said power means further comprising a variable orifice flow control means connected across the fluid inlet and outlet of each motor; c. first means for securing the jacks to each other in spaced, generally parallel relationship; and d. second securing means cooperating with the first securing means to mount the jack assembly on the loading arm.
Claim 12
Dependent Claim
32 words
A dual jack assembly according to claim 9 wherein the motors are of the high-slip type facilitating continued but slow rotation of one motor after rotation of the other motor has terminated.
References Cited (Backward Citations)
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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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |