EP0504975A1 - Hospital bed - Google Patents
Hospital bed Download PDFInfo
- Publication number
- EP0504975A1 EP0504975A1 EP92200683A EP92200683A EP0504975A1 EP 0504975 A1 EP0504975 A1 EP 0504975A1 EP 92200683 A EP92200683 A EP 92200683A EP 92200683 A EP92200683 A EP 92200683A EP 0504975 A1 EP0504975 A1 EP 0504975A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- base frame
- support frame
- linkage
- longer leg
- pivotally connected
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61G—TRANSPORT, PERSONAL CONVEYANCES, OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS; OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES
- A61G7/00—Beds specially adapted for nursing; Devices for lifting patients or disabled persons
- A61G7/002—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame
- A61G7/005—Beds specially adapted for nursing; Devices for lifting patients or disabled persons having adjustable mattress frame tiltable around transverse horizontal axis, e.g. for Trendelenburg position
Landscapes
- Health & Medical Sciences (AREA)
- Rehabilitation Therapy (AREA)
- Nursing (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Invalid Beds And Related Equipment (AREA)
- External Artificial Organs (AREA)
Abstract
Description
- The invention relates to a hospital bed comprising a wheeled base frame and a (patient) support frame carried thereby through the intermediary of a height adjustment mechanism, said height adjustment mechanism being formed by a λ-shaped linkage that has the lower end of its short leg pivotally connected to the base frame and has the upper end of its longer leg pivotally connected to the support frame at a first location, whereas the lower end of said longer leg is horizontally slidably mounted to the base frame, said linkage cooperating with an auxiliary support means that is connected to the support frame at a second location, a power source of the expansion and retraction type being provided to operate the height adjustment mechanism, said power source having one end pivotally connected to the base frame and having its other end pivotally connected to the linkage adjacent the central pivot thereof.
- Such a hospital bed is known from GB-1,319,593 and GB-1,552,596. The advantage of a λ-shaped linkage is to seen in the relative simple construction as compared with other linkages, which are more complex.
- In the well-known embodiments according to the above cited references, wherein the lower end of the longer leg is mounted for a horizontal sliding movement relative to the base frame, there is the additional advantage that a height adjustment of the support frame does not involve undesired displacements of the support frame in the horizontal direction.
- However, the hospital beds according to the above references have a number of disadvantages, which make the advantages of the λ-shaped linkage come out less prominent. For instance in the well-known hospital bed embodiments the power source - which has its upper end pivotally connected to the short leg at an intermediate location-is taking a substantially vertical position. Due to this it is very difficult to combine a relatively wide height adjustment range with a very small minimum height of the support frame and an obstacle-free space under the base frame. For the wider the height adjustment range, the larger the legs of the power source have to be and the larger the minimum height that is taken by the power source in the lowermost position of the support frame.
- Another disadvantage of the well-known hospital beds concerns the structure of the auxiliary support means.
- With the hospital bed according to GB-1,319,593 the auxiliary support means is formed by a link which is pivotally connected to the short leg of the λ-shaped linkage and which is normally - i.e. when the support frame is taking a horizontal position - forming an extension of the short leg so that in fact a cross-linkage is formed. The second location at the support frame, where the auxiliary link connects to the support frame, is slidable in the longitudinal direction of the support frame, so that the cross-linkage may vertically extend and retract while the support frame is kept horizontally oriented. In this case, however, the auxiliary link is affecting the compactness of a λ-shaped linkage, because it extends through the space between the support frame and the longer leg of the λ-linkage.
- With the embodiment according to GB-1,552,596 the auxiliary support means is formed by a piston-cylinder device, which has its upper end pivotally connected at the fixed second location of the support frame and has its lower end pivotally connected to the longer leg of the linkage. This embodiment has also the disadvantage of that according to GB-1,319,593, i.e. that the piston-cylinder device is affecting the compactness of a λ-shaped linkage. Moreover, with each adjustment of the height of the support frame it will also be necessary to adjust the piston-cylinder device (acting as the auxiliary support means in this embodiment) in order to keep the support frame horizontally oriented. Furthermore, this piston-cylinder device is forming another limiting factor in the pursuit of a slightest possible support frame height in the lowermost position.
- It is an object of the invention to remove the disadvantages of the well-known hospital beds above referred to. According to the invention this aim is achieved in that the auxiliary support means is constituted by a link that extends adjacent and parallel to the longer leg of the λ-shaped linkage and forms, together with said longer leg, a parallelogram linkage, whereby the lower end of the auxiliary link and that of the longer leg are mounted for a joint sliding movement relative to the base frame, and wherein the power source is connected with its lower end to a lower point of the base frame adjacent and below the location where the lower ends of the longer leg and of the auxiliary link are guided in the base frame.
- By positioning the power source in the manner proposed according to the invention, it may have a relative long length and may thus cover a wide height adjustment range, whereas the power source is taking only a slight height in its retracted position, so that in the lowermost position of the base frame the height of said frame above ground level may be relatively small. Furthermore the power source will - not withstanding its connecting point to the base frame being positioned at a rather low level, no obstacle in the space under the base frame between the wheel pairs.
- Moreover the dihedral angle between the support frame and the longle λ-leg is substantially free from (auxiliary) links.
- It is to be noted that EP-A-0341358 discloses a hospital bed, wherein a lifting arm, constituted by a parallelogram linkage, connects the support frame to a base frame. In this case the lifting arm has both of its two lower ends pivotally connected at fixed locations to the base frame. This however has the disadvantage (which does not exist with a λ-linkage) that an adjustment of the height of the support frame will cause the support frame to displace in the horizontal direction as well. Furthermore this well-known construction has the disadvantages which are connected with the use of a substantially vertical position of the power source.
- The two upper pivot points may be fixed points of the support frame when the hospital bed is desired to be adjustable in the vertical direction only. By using one of the two pivot points (e.g. the uppermost pivot point) has a tilting point for the support frame and connecting the second pivot point through an auxiliary link, e.g. a connecting link having an adjustable length, to the support frame, it would also be possible to place the support frame into an inclined position, the so called Trendelenburg position.
- The invention will be hereinafter further described by way of example with reference to the accompanying drawing in which:
- Fig. 1 is a diagrammatic side view of a hospital bed according to the present invention, showing the support frame in its upper and lower horizontal positions and illustrating also the possibility to place the (patient) support frame in an inclined position and
- fig. 2 is a diagrammatic side view of the bed of fig. 1 in various inclined positions, while the support frame is raised to its uppermost level.
- In the
drawing 1 designates a wheeled base frame, 2 indicates a (patient) support frame and a height adjustment mechanism therebetween is indicated at 3. The power source to be used for operating theheight adjustment mechanism 3 is indicated by a dash-dotted line. This power source may be of the expansion-retraction type, such as a hydraulic piston-cylinder device or other telescoping device, which has one end pivotally connected to a low lyingpoint 5 of the base frame adjacent the front or rear pair of castors. - The
height adjustment mechanism 3 is constituted by a λ-shaped linkage, theshort leg 20 of which has its lower end pivotally connected to thebase frame 1 about atransverse pivot axis 21. The pivot axis is located adjacent the pair of castors that is located remotely from thepivot point 5. The longer λ-leg of the linkage is a double one and consists of twoparallel links 22 of equal length, one of which is pivotally connected with the short leg in anintermediate point 23. Thelower ends upper ends links 22 constitute the angular points of a parallelogram linkage. Thelower ends base frame 1 to perform a joint horizontal sliding movement in the arrow direction. Theupper ends links 22 are connected by acoupling plate 16, which is pivotally connected to thesupport frame 2 about theupper end 26. As is shown in fig. 1 athird pivot 28 of thecoupling plate 16 is pivotally connected - through a connecting rod 29 - to aguide piece 30 that is mounted for a sliding movement in the arrow direction along the lower side of thesupport frame 2. A sliding movement of theguide piece 30 allows thesupport frame 2 to be placed from the horizontal position into an inclined position, the so-called (anti-) Trendelenburg position. Thepivots - In fig. 2 the
support frame 2 is shown in three different inclined positions, while it is raised to its highest level. - It will be appreciated that the connecting rod-
guide piece assembly slidable guide piece 30. - Fig. 1 also illustrates that the height adjustment linkage may be folded up to a link passage that hardly extends beyond the upper side of the
base frame 1.
Claims (4)
- Hospital bed comprising a wheeled base frame and a (patient) support frame carried thereby through the intermediary of a height adjustment mechanism, said height adjustment mechanism comprising a λ-shaped linkage that has the lower end of its short leg pivotally connected to the base frame and has the upper end of its longer leg pivotally connected to the support frame at a first location, whereas the lower end of said longer leg is horizontally slidably mounted to the base frame, said linkage cooperating with an auxiliary support means that is connected to the support frame at a second location, a power source of the expansion and retraction type being provided to operate the height adjustment mechanism, said power source having one end pivotally connected to the base frame and having its other end pivotally connected to the linkage adjacent the central pivot thereof, characterized in that the auxiliary support means is constituted by a link that extends adjacent and parallel to the longer leg of the λ-shaped linkage and forms, together with said longer leg, a parallelogram linkage, whereby the lower end of the auxiliary link and that of the longer leg are mounted for a joint sliding movement relative to the base frame, and wherein the power source is connected with its lower end to a point of the base frame that is located adjacent and below the location where the lower ends of the longer leg and of the auxiliary link are guided in the base frame.
- A hospital bed according to claim 1, characterized in that the power source has its upper end connected to the upper link of the parallelogram linkage forming the longer λ-leg.
- A hospital bed according to claims 1-2, characterized in that one of the two upper pivots of the parallelogram linkage is acting as a tilting pivot for the support frame, whereas the second pivot is connected with a second point of the support frame through a connecting rod of an adjustable length.
- A hospital bed according to claims 1-2, characterized in that one of the two upper pivots of the parallelogram linkage is functioning as a tilting pivot for the support frame, whereas the second pivot is connected to a second point of the support frame through a connecting rod of a constant length, said second point being displaceable in the longitudinal direction of the support frame.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL9100479 | 1991-03-18 | ||
NL9100479 | 1991-03-18 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0504975A1 true EP0504975A1 (en) | 1992-09-23 |
EP0504975B1 EP0504975B1 (en) | 1995-06-28 |
Family
ID=19859032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP92200683A Expired - Lifetime EP0504975B1 (en) | 1991-03-18 | 1992-03-10 | Hospital bed |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0504975B1 (en) |
AT (1) | ATE124250T1 (en) |
DE (1) | DE69203119T2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9418386U1 (en) * | 1994-11-17 | 1995-02-23 | Foerderverein Inst Fuer Medizi | Adjustment device for stepless height and incline adjustment of a level |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1319593A (en) * | 1969-05-29 | 1973-06-06 | Ellison George Ltd | Underframe for beds |
DE2650759A1 (en) * | 1975-11-05 | 1977-05-18 | Basler Eisenmoebelfab Ag | Hospital bed adjustable in height - has jack mechanism with diagonal swivel arm attached to base frame and guide rods with stabilising rod |
EP0221037A2 (en) * | 1985-10-24 | 1987-05-06 | Scandinavian Mobility A/S | A Lifting and lowering mechanism for all kinds of worktables |
EP0341358A1 (en) * | 1988-05-12 | 1989-11-15 | HILL-ROM COMPANY, INC. (an Indiana corporation) | Dual hydraulic hospital bed with emergency bypass circuit |
-
1992
- 1992-03-10 AT AT92200683T patent/ATE124250T1/en not_active IP Right Cessation
- 1992-03-10 DE DE69203119T patent/DE69203119T2/en not_active Expired - Fee Related
- 1992-03-10 EP EP92200683A patent/EP0504975B1/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1319593A (en) * | 1969-05-29 | 1973-06-06 | Ellison George Ltd | Underframe for beds |
DE2650759A1 (en) * | 1975-11-05 | 1977-05-18 | Basler Eisenmoebelfab Ag | Hospital bed adjustable in height - has jack mechanism with diagonal swivel arm attached to base frame and guide rods with stabilising rod |
EP0221037A2 (en) * | 1985-10-24 | 1987-05-06 | Scandinavian Mobility A/S | A Lifting and lowering mechanism for all kinds of worktables |
EP0341358A1 (en) * | 1988-05-12 | 1989-11-15 | HILL-ROM COMPANY, INC. (an Indiana corporation) | Dual hydraulic hospital bed with emergency bypass circuit |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE9418386U1 (en) * | 1994-11-17 | 1995-02-23 | Foerderverein Inst Fuer Medizi | Adjustment device for stepless height and incline adjustment of a level |
Also Published As
Publication number | Publication date |
---|---|
DE69203119T2 (en) | 1996-02-29 |
DE69203119D1 (en) | 1995-08-03 |
ATE124250T1 (en) | 1995-07-15 |
EP0504975B1 (en) | 1995-06-28 |
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