Boat lifting device
OwnerDavid L. Trowbridgeinventor
Life of this patent
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Abstract
In accordance with the present invention there is provided a lifting device for a boat, the lifting device including a first platform and a plurality of linkage members, the plurality of linkage members configured to form at least two four-bar linkage assemblies, each having a first end pivotally attached to the platform and a second end pivotally attached to a boat. The lifting device further including at least one hydraulic cylinder, the cylinder having a first end and second end, the first end being pivotally affixed to the structure of a boat and the second end pivotally attached to at least one linkage member, and a fluid device in communication with the hydraulic cylinder. A load sharing member connects the two four-bar linkage assemblies and prevents uneven or tilted motion of the platform.
Claims36
A lifting device for a boat, the lifting device comprising:
- a first platform;
- a plurality of linkage members, the plurality of linkage members configured to form at least two four-bar linkage assemblies, each four-bar linkage assembly having a first end pivotally attached to the first platform and a second end pivotally attached to a boat, wherein each four-bar linkage assembly forms two parallelogram linkages connected to each side of the first platform;
- at least one hydraulic cylinder, said cylinder having a first end and second end, the first end being pivotally connectable to the structure of a boat and the second end pivotally attached to at least one linkage member;
- a fluid device in communication with the hydraulic cylinders;
- and
- at least one load sharing member configured to span and connect to at least two of the four-bar linkages together to prevent uneven or tilted motion of the first platform.
A lifting device for a boat, the lifting device comprising:
- a first platform;
- a plurality of linkage members, the plurality of linkage members configured to form at least two four-bar linkage assemblies, each four-bar linkage assembly having a first end pivotally attached to the first platform and a second end pivotally attached to a boat;
- at least one hydraulic cylinder, said cylinder having a first end and second end, the first end being pivotally connectable to the structure of a boat and the second end pivotally attached to at least one linkage member;
- a fluid device in communication with the hydraulic cylinders, the fluid device comprises a hydraulic pump, the hydraulic pump configured to provide pressurized fluid to the hydraulic cylinder;
- and
- at least one load sharing member configured to span and connect to at least two of the four-bar linkages together to prevent uneven or tilted motion of the first platform, wherein the load sharing member is a beam substantially parallel to and spaced from the first platform;
- and
- wherein the lifting device further includes a second platform, the second platform pivotally connected to the boat and four-bar linkage assemblies.
A lifting device for lifting a personal watercraft or boat, the lifting device comprising:
- a first platform;
- a plurality of linkage members, the plurality of linkage members configured to form at least two four-bar linkage assemblies, each four-bar linkage having a first end pivotally attached to the platform and a second end pivotally attached to a boat;
- at least two force applying devices configured to raise and lower the two four-bar linkage assemblies, each force applying device having a first end and second end, the first end being pivotally connectable to the structure of a boat and the second end pivotally attached to at least one linkage member;
- a second platform, the second platform pivotally connected to the two four-bar linkage assemblies;
- and
- a control device in communication with the two force applying devices, the control device configured to control the motion of the each of the two force applying devices.
A lifting device for lifting a personal watercraft or boat, the lifting device comprising:
- a first platform;
- a second platform;
- a plurality of linkage members;
- at least one force applying device configured to raise and lower the first and second platforms, said force applying device having a first end and second end, the first end being pivotally connectable to a boat and the second end pivotally connected to at least one linkage member;
- and
- a control device in communication with the force applying device, the control device configured to control the motion of the force applying device, whereby the force applying device and control device are configured to move both the first platform and the second platform from a raised position to a lowered position, wherein when the second platform is moved from a raised position to a lowered position, the second platform is moved less than half a distance the first platform is moved from the raised position to the lowered position.
Dependencies are inferred from the claim text.