Beds – With means for relocating an invalid – With a hoisting – lifting – elevating – or raising device
Reexamination Certificate
2002-10-01
2004-04-13
Luu, Teri Pham (Department: 3673)
Beds
With means for relocating an invalid
With a hoisting, lifting, elevating, or raising device
C005S08110R
Reexamination Certificate
active
06718573
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to an invalid hoist.
It is known from GB-A-2189219 to provide an invalid hoist comprising a mobile chassis, a support structure or mast upstanding from the chassis, a lifting arm connected to the upper end of the support structure or mast for pivotable movement about a first horizontal axis, a housing supporting a vertical bearing at one end of the lifting arm, the housing being pivotable relative to the lifting arm about a second horizontal axis, a sling hanger support supported by the bearing for pivotable movement about a vertical or substantially vertical axis, and a sling hanger supported by the sling hanger support for pivotable movement about a third horizontal axis. The lifting arm comprises two rigid links of a parallelogram linkage, one of the links being disposed within a central space within the other link. The parallelogram linkage maintains the vertical orientation of the bearing and a safe and compact lifting arm construction is provided by disposing one link within the other.
However, for ergonomic and aesthetic reasons, it is often preferred today to use non-rectilinear lifting arms and, in this case, it is not possible to form a parallelogram linkage from two rigid links, one within the other.
The present invention seeks to overcome this problem.
SUMMARY OF THE INVENTION
According to the present invention, there is provided an invalid hoist comprising a mobile chassis, a support structure or mast upstanding from the chassis, a non-rectilinear lifting arm connected to the upper end of the support structure or mast for pivotable movement about a first horizontal axis, a housing supporting a vertical bearing at one end of the lifting arm, the housing being pivotable relative to the lifting arm about a second horizontal axis, a sling hanger support supported by the bearing for pivotable movement about a vertical or substantially vertical axis and a sling hanger supported by the sling hanger support for pivotable movement about a third horizontal axis, wherein a flexible elongate element is connected between the support structure or mast and the housing in spaced relationship to the first and second horizontal axes, respectively, and is guided through the lifting arm to effectively form with the lifting arm a parallelogram linkage between the support structure or mast and the housing so that, as the lifting arm pivots, the housing pivots in relation to the lifting arm to keep the bearing vertical or substantially vertical.
Preferable and/or optional features of the present invention are set out in claims
2
to
10
, inclusive.
The invention will now be more particularly described, by way of example, with reference to the accompanying drawings.
REFERENCES:
patent: 5892180 (1999-04-01), Carey
patent: 6175973 (2001-01-01), Hakamiun et al.
patent: 2 184 706 (1987-07-01), None
patent: 2 189 219 (1987-10-01), None
patent: 2 297 307 (1996-07-01), None
Arjo. Med. Aktiebolag Limited
Young & Thompson
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