Patent US2533984A successfully refreshed from Google Patents.
US3900906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable bed
Assignee: Century Manufacturing Co
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Filing: 1974-04-18
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Granted: 1975-08-26
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Expires: 1994-04-18
Abstract
Abstract To adjust a bedstead to any angle with respect to the floor without raising one edge to an excessive height, two corresponding pairs of hydraulic cylinders of an adjustable bed are connected to a movable frame along the pitch axis and roll axis of the movable frame by universal joints to permit pivoting in any direction about a stationary center point. As a first piston, connected at a location along the roll axis, is extended, a corresponding second piston, located a distance from the first piston along the same axis, is retracted by an equal amount, so that the foot of the bedstead moves in the opposite direction from the head of the bedstead, with a point on the movable frame centered between the two end connections of the piston rods rotating through an angle but not moving vertically. Third and fourth hydraulic cylinders operate in the same manner along the pitch axis to change the roll position of the bedstead, with the roll axis and the pitch axis having coincident midpoints.
Inventors
- 👤 Owen W Berthelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:25
CPC Classifications
A; A61; A61G; A61G7/00; A61G7/002
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
236 words
An adjustable patient support apparatus, comprising: a base support; said base support including a support member; a movable frame adapted to support said patient in an adjustable position having a first axis of rotation and a second axis of rotation; said first and second axes crossing substantially at a point of intersection; means for moving at least portions of said movable frame with respect to said support member; said means for moving said movable frame including means for selectively pivoting said movable frame about the first axis of rotation and about the second axis of rotation without substantially changing the elevation of said point of intersection with respect to said support member, whereby said movable frame is pivoted in either or both of two directions; said means for moving said movable frame including first movable means for pivoting said movable frame about the first axis and second movable means for pivoting said movable frame about the second axis; said first movable means including a first base mounted stationary with respect to said support member and a first driven arm connected to one point on one of said axes a first distance from said point of intersection; said second movable means including a second base mounted stationary with respect to said support member and a second driven arm connected to the other of said axes at a second point a second distance from said point of intersection.
Claim 2
Dependent Claim
236 words
An adjustable patient support apparatus, comprising: a base support; said base support including a support member; a movable frame adapted to support said patient in an adjustable position having a first axis of rotation and a second axis of rotation; said first and second axes crossing substantially at a point of intersection; means for moving at least portions of said movable frame with respect to said support member; said means for moving said movable frame including means for selectively pivoting said movable frame about the first axis of rotation and about the second axis of rotation without substantially changing the elevation of said point of intersection with respect to said support member, whereby said movable frame is pivoted in either or both of two directions; said means for moving said movable frame including first movable means for pivoting said movable frame about the first axis and second movable means for pivoting said movable frame about the second axis; said first movable means including a first base mounted stationary with respect to said support member and a first driven arm connected to one point on one of said axes a first distance from said point of intersection; said second movable means including a second base mounted stationary with respect to said support member and a second driven arm connected to the other of said axes at a second point a second distance from said point of intersection.
Claim 3
Dependent Claim
53 words
An adjustable patient support apparatus in accordance with claim 1 in which said base support further includes: a universal joint; and a stationary frame; one portion of said support member being adapted to be supported on said stationary frame and another portion being connected to said point of intersection by said universal joint.
Claim 4
Dependent Claim
66 words
An adjustable patient support apparatus in accordance with claim 1 in which said first movable means further includes a third base mounted stationary with respect to said support member and a third driven arm connected to said one of said axes at a third point a third distance from said point of intersection on the opposite side of said point of intersection from said one point.
Claim 5
Dependent Claim
65 words
An adjustable patient support apparatus in accordance with claim 3 in which said second movable means includes a fourth base mounted stationary with respect to said support member and a fourth driven arm connected to said other of said axes at a fourth point a fourth distance From said point of intersection on the opposite side of said point of intersection from said second point.
Claim 6
Dependent Claim
73 words
An adjustable patient support apparatus in accordance with claim 3 in which said means for moving said movable frame includes means for moving said first driven arm in a first direction a fifth distance and said third driven arm a sixth distance in a second direction with the product of said first and sixth distances being equal to the product of said third and fifth distances, whereby pivoting about said axis is provided.
Claim 7
Dependent Claim
129 words
An adjustable patient support apparatus in accordance with claim 4 in which said means for moving said movable frame includes: means for moving said first driven arm in a first direction a fifth distance and said second driven arm a sixth distance in a second direction with the product of said first and sixth distances being equal to the product of said third and fifth distances, whereby pivoting about said one axis is provided; and means for moving said second driven arm in a third direction a seventh distance and said fourth driven arm an eighth distance in a fourth direction with the product of said second and eighth distances being equal to the product of said fourth and seventh distances, whereby pivoting about said other axis is provided.
Claim 8
Dependent Claim
72 words
An adjustable patient support apparatus in accordance with claim 4 in which: said first and second movable means includes first, second, third and fourth hydraulic cylinders each having a different housing and piston rod; said first, second, third and fourth bases each comprising a hinge means connecting the housings of said hydraulic cylinders to said base support; said first, second, third and fourth driven arms being the piston rods of said cylinders.
Claim 9
Dependent Claim
18 words
An adjustable patient support apparatus according to claim 7 in which said first and third distances are equal.
Claim 10
Dependent Claim
55 words
An adjustable patient support apparatus in accordance with claim 7 in which said base support further includes: a universal joint; and a stationary frame; one end of said support member being adapted to be supported on said stationary support frame and the other end being connected to said point of intersection by said universal joint.
Claim 11
Dependent Claim
38 words
An adjustable patient support apparatus in accordance with claim 9 in which said base support further includes means for elevating said support member with respect to said stationary frame whereby the elevation of said movable frame is changed.
Claim 12
Dependent Claim
18 words
An adjustable patient support apparatus in accordance with claim 2 in which said universal joint includes needle bearings.
Claim 13
Dependent Claim
38 words
An adjustable patient support apparatus in accordance with claim 2 in which said base support further includes means for elevating said support member with respect to said stationary frame whereby the elevation of said movable frame is changed.
Claim 14
Dependent Claim
24 words
An adjustable patient support apparatus in accordance with claim 12 in which said bases and driven arms are lockable with respect to each other.
Claim 15
Dependent Claim
130 words
An adjustable patient support apparatus in accordance with claim 7 in which said first movable means includes: a source of hydraulic pressure having first and second ports for the application of pressure through one of said first and second ports and the venting of hydraulic pressure through the other of said first and second ports; and first conduit means for selectively bringing one of said first and second hydraulic cylinders into communication with one of said ports and the other hydraulic cylinder into communication with said other of said ports; second conduit means for selectively bringing one of said second and fourth hydraulic cylinders into communication with said second hydraulic cylinder to one of said ports and said base of said fourth hydraulic cylinder to the other of said ports.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |