[0001] This invention relates to a patient support such as a hospital bed or chair.
[0002] An object of the invention is to provide a new and improved patient support.
[0003] According to one aspect of the invention, we provide a patient support comprising
a base, a support part and a linkage to mount the support part on the base for movement
up and down relative to the base, wherein the linkage comprises a pair of upper and
lower links pivotally connected at their one ends to the base at vertically spaced
positions and pivotally connected at their other ends to the support part at vertically
spaced positions, and drive means to cause the support part to move up and down relative
to the base as a result of pivotal movement of the links.
[0004] The links may be pivotally mounted on one side of an upwardly extending mounting
part provided on the base and on one side of a downwardly extending mounting part
provided on the support part.
[0005] The linkage may include a further link pivotally connected at one end to the base
and at its other end to the support part about axes which are co-axial with the axes
of pivot of the upper of said pair of upper and lower links.
[0006] The further link may be disposed on the opposite side of said mounting parts to said
pair of upper and lower links.
[0007] Alternatively, particularly where the support part is relatively wide, two pairs
of upper and lower links may be provided each pair being pivotally connected at their
one ends to the base at vertically spaced positions and pivotally connected at their
other ends to the support part at vertically spaced positions.
[0008] The links of one pair may be pivotally mounted on one side of an upwardly extending
mounting part provided on the base and one side of a downwardly extending mounting
part on the support part whilst the links of the other pair may be pivotally mounted
on the other side of a second upwardly extending mounting part provided on the base
and on the other side of a second downwardly extending mounting part provided on the
support part, said other sides facing in the opposite direction to said one side.
[0009] The linkage may include a further link pivotally connected at one end of the base
about the axis of pivotal connection of the upper of each pair of links to the base
and at its opposite end to the support part about the axis of pivotal connection of
the upper link of the pair of links to the support part with the further link being
disposed between the upwardly extending mounting parts provided on the base and the
downwardly extending mounting part provided on the support part.
[0010] In both alternatives:-
[0011] The drive means may act on the further link.
[0012] The further link may have a lever connected thereto to extend transversely therefrom
and an actuator of the drive means may be connected to the lever at a position spaced
transversely from the line joining the axis of pivot of the further link.
[0013] The actuator may comprise a drive member of an electric screw jack or of a manually
or power operated hydraulic jack.
[0014] The base may comprise a generally centrally disposed longitudinally extending member
and, at opposite ends thereof transversely extending members provided with a ground-engageable
means, the patient supporting part being carried by the longitudinally extending member.
[0015] According to a second aspect of the invention, we provide a patient support comprising
a base and support part mounted on the base where the base comprises a generally centrally
disposed longitudinally extending member and at opposite ends thereof transversely
extending members provided with ground-engageable means, the patient supporting part
being carried by the longitudinally extending member.
[0016] In both first and second aspects of the invention, the transversely extending member
of one end of the base may extend perpendicular to the longitudinally extending member.
[0017] The transversely extending member at one end of the base may comprise a pair of inclined
elements which diverge longitudinally and transversely from the longitudinally extending
member.
[0018] In the first aspect of the invention, the upwardly extending mounting part may extend
upwardly from the longitudinally extending member.
[0019] The longitudinally extending member may comprise a single circular cross-section
tube and, where a single upwardly extending mounting part is provided, the upwardly
extending mounting part may extend upwardly from the tube.
[0020] Alternatively, the longitudinally extending member may comprise a pair of spaced
parallel circular cross-section tubes interconnected by transversely extending members
and where two upwardly extending mounting parts are provided, one mounting part may
extend from each of the tubes.
[0021] The support part may comprise a first section having at least one further section
pivotally connected thereto for movement about a horizontal axis.
[0022] The support part may comprise a first section from which the downwardly extending
mounting part depends downwardly.
[0023] The first section may comprise a single longitudinally extending member having opposed
ends to at least one of which a further section is pivotally connected.
[0024] The downwardly extending mounting part may be disposed adjacent one end of the first
section.
[0025] The upwardly and downwardly extending mounting parts may be provided with longitudinal
bracing from the associated base or support part respectively.
[0026] The support part may comprise a bed and where the linkage comprises said two pairs
of parallel linkage, the bed may have a width of at least 40cm.
[0027] Alternatively, the support part may provide a chair.
[0028] When the support part provides a bed, the drive means may be carried on the base
beneath the foot end of the bed.
[0029] When the support part provides a chair, the drive means may be carried on the base
beneath the head end of the chair.
[0030] When the support part provides a chair, there may be two further sections connected
to the first section, namely a legrest section and a backrest section provided at
opposite ends of the first section.
[0031] Means may be provided to interlink the backrest section and the legrest section so
that pivotal movement of one is accompanied by a corresponding movement in the other.
[0032] The legrest section may be provided with a pivotally adjustable footrest section.
[0033] When the support part provides a chair, the support part may be upholstered with
seamless contoured firm type upholstery.
[0034] According to a third aspect of the invention, we provide a patient support comprising
a base and a support part mounted on the base and comprising a chair, the chair being
provided with at least one armrest connected to the chair for movement between a position
in which the armrest extends generally longitudinally of the chair to a position in
which the armrest extends transversely outwardly of the chair.
[0035] According to the first and second aspects of the invention, the patient support may
comprise a chair and the chair may be provided with an armrest connected to the chair
for movement between a position in which the armrest extends generally longitudinally
of the chair a position in which the armrest extends transversely outwardly of the
chair.
[0036] The armrest may also be mounted for pivotal movement about a generally horizontal
axis between a position in which the armrest extends generally longitudinally of the
chair in a generally horizontal position and a position in which the armrest is inclined
upwardly.
[0037] The armrest may be connected to the chair by a linkage comprising a pair of unequal
length links pivotally connected at their one ends to the armrest and at their other
ends to the chair, the pivotal connections of each link lying on a line and the lines
being parallel.
[0038] Embodiments of the invention will now be described by way of example with reference
to the accompanying drawings, wherein:-
FIGURE 1 is a side elevation of a bed embodying the invention and having a hydraulic
drive means;
FIGURE 2 is a side elevation of another bed embodying the invention provided with
an electrical drive means;
FIGURE 3 is a plan view of the base part and linkage of the bed of Figure 1, with
parts omitted for clarity;
FIGURE 4 is a view similar to that of Figure 3 but of the bed of Figure 2;
FIGURE 5 is a plan view, with parts omitted for clarity, of the bed of Figure 2;
FIGURE 6 is a side elevation of another bed embodying the invention;
FIGURE 7 is a view similar to that of Figure 2 but of the bed of Figure 6;
FIGURE 8 is a side elevation of a chair embodying the invention;
FIGURE 9 is a plan view similar to that of Figure 2 but of the chair of Figure 8;
FIGURE 10 is a perspective view of the chair of Figure 8;
FIGURES 11 and 12 are diagrammatic illustrations of an arm mounting means of the chair
of Figure 8 with parts omitted for clarity.
[0039] Referring to the drawings, a bed is indicated generally at 10 in Figure 1 and comprises
a base 11 and a support part 12. As shown in Figure 3, the base comprises a central
longitudinally extending member 13 comprising a single tube 14 of cylindrical internal
and external configuration having welded thereto at opposite ends transversely extending
members 15 which extend perpendicular to the tube 13.
[0040] The transversely extending members 15 carry castors 16 in conventional manner.
[0041] Welded to the tube 14 so as to extend upwardly therefrom is a mounting part 17 of
generally rectangular configuration. Pivotally connected to the mounting part 17 are
a pair of parallel upper and lower links 18, 19 which are pivotally connected at their
one ends to the mounting means 17 about vertically spaced axes 20, 21 whilst at their
other ends the links 18, 19 are pivotally connected to a downwardly extending mounting
member 22 about vertically spaced axes 23, 24.
[0042] As best shown in Figure 3, the links 18, 19 are disposed on one side of the mounting
members 17, 22 by virtue of a pivot pin (not shown) which is housed within a sleeve
25 fixed, for example, by welding, to an aperture in the associated mounting parts
17, 22 and received within a sleeve 26 welded to opposite ends of the respective link
18 with a retaining cap 27 provided to retain the rod in position.
[0043] On the opposite side of the mounting members 17, 22 a further link 30 is provided
which is pivotally mounted co-axial with the link 18 by virtue of the abovementioned
pivot rod being received in further sleeves 31 welded to the further link 30 and the
rod being retained by further retaining caps 27.
[0044] As best shown in Figure 1, the further link 30 has a transversely extending lever
32 which is pivotally connected at 33 to the actuating member 34 of a jack 35 operated
by a foot pedal 36.
[0045] The downwardly extending mounting member 22 is welded to a central longitudinally
extending member 37 of a first section 38 of the support part 12 and is provided with
a suitable brace 39. The longitudinally extending member 37, has a transversely extending
member 40 welded thereto at one end and an intermediate transversely extending member
41 and a further transversely extending member 42 at its other end. The transversely
extending members support an upholstered mattress platform 43.
[0046] The transversely extending member 40 is provided with hinges 44 by which a further
section which comprises a head section 45 is pivotally connected to the first section
38 for pivotal movement upwardly or downwardly. A stay 46, pivotally connected to
the mounting part 22 at 47, is connected to a conventional tilting plate locking mechanism
48 to enable the headrest part 45 to be inclined upwardly or downwardly at a desired
angle.
[0047] The bed shown in Figures 2 and 4 is essentially similar to that shown in Figures
1 and 3 except that the hydraulically operated jack 35 is replaced by an electrically
operated screw jack 35
a. In addition, the support part 38 comprises three pivotally interconnected sections.
The head section 45 and the righthand part of the first section 38 are as described
hereinbefore but in this embodiment the first section 38 is of shorter longitudinal
extent and in the region of the transversely extending member 41 has a legrest section
38
a pivotally connected thereto.
[0048] Referring now to Figures 6 and 7, there is shown a bed essentially similar to the
bed of figures 3 and 4 except that the bed frame is provided with a central longitudinally
extending member 13 which comprises two spaced parallel circular cross-section tubes
14
a, 14
b to which transversely extending members 15 as previously described are welded.
[0049] Each tube 14
a, 14
b has a separate upstanding mounting part 17
a, 17
b in which a sleeve 25
a, 25
b is welded. The sleeves 25
a, 25
b receive a pivot rod (not shown) which is received in a sleeve 26
a, 26
b welded to the one ends of each link 18
a, 19
a and 19
a, 19
b of the sets of links.The other ends of the links are similarly connected to two downwardly
extending mounting parts 22
a, 22
b.
[0050] A further link 30
a is mounted on the pivot pin by means of a sleeve 31
a welded to one end of the further link 30 whilst the opposite link of the link 30
is similarly connected to the pivot rod of the downwardly extending mounting parts
22
a, 22
b. The further link 30
a has a transversely extending arm 32
a which is connected to an actuating member 34
a of an electrically operated screw jack 35
b which is positioned more centrally of the chassis than the screw jack 35
a shown in Figure 4.
[0051] In all other respects the bed of Figures 6 and 7 is the same as the bed of Figures
3 to 5 except that two rods and tilting plate mechanisms are provided for the foot
and head ends instead of the single rods 46, 46
a shown in Figure 5 and the mattress is wider.
[0052] Referring to Figures 8 to 12, there is illustrated a dialysis chair 60. The chair
60 comprises a base 11' comprising two parallel tubes 14'
a, 14'
b similar to the tubes 14
a, 14
b described hereinbefore. The tubes 14'
a, 14'
b are shorter than the tubes 14
a, 14
b and at the foot end of the chair are welded to two diverging further rectangular
tubes 60, 61 which carry castors 62 at their outer ends in conventional manner. At
their other ends the tubes 14'
a, 14'
b are connected to a transversely extending member 151 corresponding to the member
15 described hereinbefore.
[0053] The chair is provided with a linkage mechanism L as described hereinbefore in connections
with Figures 6 and 7. The support part comprises a first, central, section 38' having
pivotally connected thereto at opposite ends a backrest part 65 and a legrest part
66. Suitable means such as the rods 46, 46
a described hereinbefore may be provided to permit of adjustment of the headrest and
legrest parts. Alternatively, and preferably, a gas spring (not illustrated) may be
provided to facilitate adjustment of the headrest and/or legrest parts. Further alternatively,
at least one of the headrest and legrest parts may be adjusted by a electrically operated
screw jack means mounted beneath the first, central, section 38'.
[0054] Preferably an interconnecting linkage is provided so that pivotal movement of the
headrest part is accompanied by corresponding opposite movement of the legrest part.
[0055] If desired, the legrest part 66 may be provided with a footrest part which is pivotal
relative to the remainder of the legrest part and the pivotal movement may be controlled
by any suitable means such as those previously described for controlling movement
of the headrest and legrest parts.
[0056] It will be noted that the drive means, which in the version illustrated is an electrically
operated screw jack 35'
a similar to the screw jack 35
a described hereinbefore, is disposed at the head end of the chair whereas in the previously
described embodiments the drive means is provided at the foot end of the bed.
[0057] If desired, instead of an electrically operated screw jack a foot or power operated
hydraulic jack may be provided similar to that described with reference to Figures
1 and 3 and such a jack may be provided in the embodiment of Figures 6 and 7.
[0058] The backrest part of the chair is provided with a pair of armrests 70. Each armrest
70 is connected to the chair by a pair of unequal length links 71, 72. The link 71
being half the length of the link 72. At their one ends the links 71 and 72 are pivotally
connected to a plate 70
a at positions 73, 74 which are spaced apart transversely of the longitudinal extent
of the armrest by a distance equal to the length of the link 71.
[0059] The plate 70
a is mounted to the backrest portion for pivotal movement about a horizontal axis.
[0060] At their other ends the links are connected at 75, 76 to a second plate 70
b, fixed to the armrest, at positions which are spaced apart by the same distance as
the positions 73, 74.
[0061] Accordingly, each armrest can be pivoted upwardly about the horizontal axis between
the plates 77 and 78 and can also be swung between an inner position in which the
links 71, 72 are inclined inwardly at an angle of about 30° and in which the armrest
extends substantially longitudinally of the chair but slightly diverging at an angle
of 5° and an inoperative position in which the armrest is pivoted outwardly through
about 90°.
[0062] The features disclosed in the foregoing description, or the accompanying drawings,
expressed in their specific forms or in the terms or means for performing the desired
function, may, separately or in any combination of such features, be utilised for
realising the invention in diverse forms thereof.
1. A patient support comprising a base, a support part and a linkage to mount the support
part on the base for movement up and down relative to the base, wherein the linkage
comprises a pair of upper and lower links pivotally connected at their one ends to
the base at vertically spaced positions and pivotally connected at their other ends
to the support part at vertically spaced positions, and drive means to cause the support
part to move up and down relative to the base as a result of pivotal movement of the
links.
2. A patient support according to Claim 1 wherein the links are pivotally mounted on
one side of an upwardly extending mounting part provided on the base and on one side
of a downwardly extending mounting part provided on the support part.
3. A patient support according to Claim 1 or Claim 2 wherein the linkage includes a further
link pivotally connected at one end to the base and at its other end to the support
part about axes which are co-axial with the axes of pivot of the upper of said pair
of upper and lower links.
4. A patient support according to Claim 3 when dependent on Claim 2 wherein the further
link is disposed on the opposite side of said mounting parts to said pair of upper
and lower links.
5. A patient support according to Claim 1 wherein two pairs of upper and lower links
are provided, each pair being pivotally connected at their one ends to the base at
vertically spaced positions and pivotally connected at their other ends to the support
part at vertically spaced positions.
6. A patient support according to Claim 5 wherein the links of one pair are pivotally
mounted on one side of an upwardly extending mounting part provided on the base and
one side of a downwardly extending mounting part on the support part whilst the links
of the other pair are pivotally mounted on the other side of a second upwardly extending
mounting part provided on the base and on the other side of a second downwardly extending
mounting part provided on the support part, said other sides facing in the opposite
direction to said one side.
7. A patient support according to Claim 6 wherein the linkage includes a further link
pivotally connected at one end of the base about the axis of pivotal connection of
the upper of each pair of links to the base and at its opposite end to the support
part about the axis of pivotal connection of the upper link of the pair of links to
the support part with the further link being disposed between the upwardly extending
mounting parts provided on the base and the downwardly extending mounting part provided
on the support part.
8. A patient support according to any one of the preceding claims wherein the base comprises
a generally centrally disposed longitudinally extending member and, at opposite ends
thereof transversely extending members provided with a ground-engageable means, the
patient supporting part being carried by the longitudinally extending member.
9. A patient support comprising a base and support part mounted on the base where the
base comprises a generally centrally disposed longitudinally extending member and
at opposite ends thereof transversely extending members provided with ground-engageable
means, the patient supporting part being carried by the longitudinally extending member.
10. A patient support according to Claim 8 or Claim 9 wherein the transversely extending
member of one end of the base extends perpendicular to the longitudinally extending
member and/or the transversely extending member at one end of the base comprises a
pair of inclined elements which diverge longitudinally and transversely from the longitudinally
extending member.
11. A patient support according to Claim 8 or Claim 10 wherein the upwardly extending
mounting part extends upwardly from the longitudinally extending member.
12. A patient support according to Claim 10 wherein the longitudinally extending member
comprises either a) a single circular cross-section tube and, where a single upwardly
extending mounting part is provided, the upwardly extending mounting part extends
upwardly from the tube, or b) a pair of spaced parallel circular cross-section tubes
interconnected by transversely extending members and, where two upwardly extending
mounting parts are provided, one mounting part extends from each of the tubes.
13. A patient support comprising a base and a support part mounted on the base and comprising
a chair, the chair being provided with at least one armrest connected to the chair
for movement between a position in which the armrest extends generally longitudinally
of the chair to a position in which the armrest extends transversely outwardly of
the chair.