US3899083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device ofr damping pendulum movements
Assignee: VULKAN HAFENTECHNIK GmbH
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Filing: 1973-03-22
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Granted: 1975-08-12
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Expires: 1993-03-22
Abstract
Abstract A hoist structure with a load frame suspended on cables in which swinging movements of the load frame in which at least the lateral direction are damped. The suspending cables include a pair of cables in longitudinally spaced relation with the cables of each pair spaced in the lateral direction. Each cable leads downwardly to the load frame and about a pulley and upwardly to a point of connection. The pulleys pertaining to the cables of a pair of cables are coaxially and relatively rotatably and damping means are provided, preferably fluid damping means, and interposed between the pulleys of each pair of pulleys so that relative movement between the pulleys is damped and thereby lateral swinging movements of the load frame are damped.
Inventors
- 👤 Hinrich Flessner
- 👤 Bernhard Hoffmeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:17
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/04; B66C13/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
406 words
A hoist structure including: a first frame, a load supporting second frame which is suspended from said first frame, by means of two pairs of lifting cables of a hoisting drum means mounted on said first frame, and by means of two pairs of pulleys independently rotatable journalled upon said second frame, the pulleys of each said pair having a common axis of rotation and being arranged with a distance from one another, the two axes of rotation of said two pairs of pulleys being arranged horizontal and parallel to one another, each pair of said cables leading from said first frame downwards to the pulleys of one of said pairs in such arrangement, so that each of the cables of each said pair of cables is passed around a pulley of one of said pairs of pulleys, the cables of each pair ascending from its pair of pulleys in two strands to a fastening means of said first frame in two spaced points, said strands of each said pair of cables lying nearly within a plane parallel to said axes of rotation of said pairs of pulleys and inclined with respect to said axes, said two strands of each pair crossing between said first and second frames in such a manner; that in response to swinging movement of said second frame parrallel to said axes, the pulleys of each of said pairs of pulleys are rotated in opposite directions, a damping means being operatively interposed between the pulleys of each said pair of pulleys and comprising a fluid displacement means including at least one pair of displacing members one of which is hollow and connected to one pulley of the same pair of pulleys, the other displacing member of the same pair of displacing members being guided within said first displacing member and connected to the other pulley of the same pair of pulleys, said fluid displacement means including at least two volumes each being enclosed by at least one said pair of displacing members and filled with fluid, a conduit means interconnecting said two volumes and including choke means in such an arrangement that rotation of said pulleys of the same pair of pulleys in opposite directions will cause relative movement of said two displacing members so that a portion of said fluid will flow from one of said volumes through said conduit means and through said choke means to the other said volume.
Claim 2
Dependent Claim
406 words
A hoist structure including: a first frame, a load supporting second frame which is suspended from said first frame, by means of two pairs of lifting cables of a hoisting drum means mounted on said first frame, and by means of two pairs of pulleys independently rotatable journalled upon said second frame, the pulleys of each said pair having a common axis of rotation and being arranged with a distance from one another, the two axes of rotation of said two pairs of pulleys being arranged horizontal and parallel to one another, each pair of said cables leading from said first frame downwards to the pulleys of one of said pairs in such arrangement, so that each of the cables of each said pair of cables is passed around a pulley of one of said pairs of pulleys, the cables of each pair ascending from its pair of pulleys in two strands to a fastening means of said first frame in two spaced points, said strands of each said pair of cables lying nearly within a plane parallel to said axes of rotation of said pairs of pulleys and inclined with respect to said axes, said two strands of each pair crossing between said first and second frames in such a manner; that in response to swinging movement of said second frame parrallel to said axes, the pulleys of each of said pairs of pulleys are rotated in opposite directions, a damping means being operatively interposed between the pulleys of each said pair of pulleys and comprising a fluid displacement means including at least one pair of displacing members one of which is hollow and connected to one pulley of the same pair of pulleys, the other displacing member of the same pair of displacing members being guided within said first displacing member and connected to the other pulley of the same pair of pulleys, said fluid displacement means including at least two volumes each being enclosed by at least one said pair of displacing members and filled with fluid, a conduit means interconnecting said two volumes and including choke means in such an arrangement that rotation of said pulleys of the same pair of pulleys in opposite directions will cause relative movement of said two displacing members so that a portion of said fluid will flow from one of said volumes through said conduit means and through said choke means to the other said volume.
Claim 3
Dependent Claim
116 words
A hoist structure according to claim 1 in which thE fluid displacement means includes two pairs of displacing members, one displacing member of each pair being a cylinder supported by a body which is nonrotatably connected to one pulley of said pair of pulleys, the other displacing members of said pair being double acting pistons which are connected to the ends of a lever which is about midway between these ends connected to the other pulley of the same pair of pulleys, spring means acting between said body and said lever and biasing said lever toward a centered position relative to said body, two conduits interconnecting corresponding ends of said two cylinders and including choke means.
Claim 4
Dependent Claim
56 words
A hoist structure according to claim 2 which includes a pressure accumulator mounted on said body and connected to said conduits through further conduit means which include check valve means opening toward said conduits, counterweight means on said body to balance the body and the parts connected thereto about the axis of rotation of said pulleys.
Claim 5
Dependent Claim
44 words
A hoist structure according to claim 1 which includes a deviating roller adjacent the pulley end of each ascending strand and about which the respective cable is entrained in the region thereof between the lower end of the respective strand and the representative pulley.
Claim 6
Dependent Claim
46 words
A hoist structure according to claim 1 in which each said fastening means includes an arm connected to said first frame for each pair of cables and swingable on the first frame on an axis substantially parallel to the axes of the rotation of said pulleys.
Claim 7
Dependent Claim
65 words
A hoist structure according to claim 5 in which at least one of said arms is also tiltable about a further axis substantially perpendicular to the swing axis of the same arm, said further axis being about midway between the said points of connection of the cables to the said arm, and a damping device connected to said one arm and damping tilting movements thereof.
Claim 8
Dependent Claim
75 words
A hoist structure according to claim 1 in which said first means comprises cylinders and said second means comprises pistons extending into said cylinders, a first body supporting said cylinders and nonrotatably connected to one of said pair of pulleys, a second body to which said pistons are connected and nonrotatably connected to the other of said pulleys, conduit means interconnecting said cylinders, said choke means comprising at least one throttle member in said conduit.
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) | 1978-08-11 | 1979-02-10 | 1979-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-11 | 1983-02-10 | 1983-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-11 | 1987-02-10 | 1987-08-12 | $7700.00 | Window Closed / Lapsed |