EP1702600B1 - Stretcher - Google Patents
Stretcher Download PDFInfo
- Publication number
- EP1702600B1 EP1702600B1 EP06250692A EP06250692A EP1702600B1 EP 1702600 B1 EP1702600 B1 EP 1702600B1 EP 06250692 A EP06250692 A EP 06250692A EP 06250692 A EP06250692 A EP 06250692A EP 1702600 B1 EP1702600 B1 EP 1702600B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- stretcher
- driven wheel
- driven
- ground
- movement
- 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.)
- Not-in-force
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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
- A61G7/08—Apparatus for transporting beds
-
- 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
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0206—Stretchers with wheels characterised by the number of supporting wheels if stretcher is extended
- A61G1/0218—3 pairs having wheels within a pair on the same position in longitudinal direction, e.g. on the same axis
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- 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
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0237—Stretchers with wheels having at least one swivelling wheel, e.g. castors
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- 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
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/025—Stretchers with wheels having auxiliary wheels, e.g. wheels not touching the ground in extended position
- A61G1/0268—Stretchers with wheels having auxiliary wheels, e.g. wheels not touching the ground in extended position having deployable or retractable wheels
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- 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
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0275—Stretchers with wheels having driven wheels, e.g. motorised
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- 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
- A61G1/00—Stretchers
- A61G1/02—Stretchers with wheels
- A61G1/0287—Stretchers with wheels having brakes, e.g. slowing down and/or holding
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- 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
- A61G7/05—Parts, details or accessories of beds
- A61G7/0528—Steering or braking devices for castor wheels
Definitions
- the present invention relates to a stretcher and a method of operating a stretcher.
- any reference to a stretcher includes a stretcher trolley.
- Stretchers are presently manoeuvred manually by an operator who exerts the forces required to direct and move the stretcher about hospital ward, between wards, between ambulances and between ambulances and incidents.
- the operator has to exert a considerable force in order to control the stretcher. The effect can be bad for the back of the operator.
- the force is increased when manoeuvring the stretcher up steep inclines or ramps, such as an ambulance ramp or hospital ramp.
- the wheels of the stretcher are mounted on swivels, which, particularly if the ramp tilts to one side (such as may occur when the vehicle is not parked on level ground), as the operator pushes the stretcher up it can run off the stretcher.
- the stretcher can run off course when going up or down hill or on a slope.
- the stretcher can run away down hill if on a steep hill or if the operator slips and loses grip. All of these problems are accentuated when the patient on the stretcher is particularly heavy.
- US-A-2003/0159861 discloses a wheeled carriage for supporting a patient in a substantially horizontal position.
- a control apparatus controls the wheel support structure to move the auxiliary wheels between a first deployed position whereat castered wheels one end of the carriage are elevated from a floor surface, and a second stored position with the auxiliary wheels out of engagement with the floor surface.
- EP-A-0769286 discloses a further patient transfer apparatus having casters disposed at four locations on a frame, and a drive mechanism which is elevatable with respect to the frame.
- a stretcher includes at least three non-driven wheels and at least one driven wheel, the driven wheel being moveable relative to at least one of the non-driven wheels between a driven position in which the driven wheel is in contact with the ground and a non-driven position in which the driven wheel is spaced from the ground, characterised by: the stretcher being adapted such that the height of a patient support above the ground, in the region of the driven wheel first decreases and then increases as movement occurs between the two positions.
- At least one of the driven wheels or a non-driven wheel may be moveably mounted on the stretcher in order to effect the movement between the two positions.
- At least one of the non-driven wheels may be spaced on the ground.
- the driven wheel may be pivotally mounted on the stretcher about an axis offset from that wheels rotational axis to effect the movement between the driven and non-driven positions.
- the movement in at least one direction between the positions may be effected by driving means.
- the drive means may be arranged to hold the stretcher in at least one of the positions with the hold being exerted in at least one of the positions being releasable.
- the movement from at least one position to another may be effected by manual movement of a telescopic arm.
- the movement in at least one direction between the positions may be effected by driving means which may include an extendable and contractible member pivotably connected to the stretcher and a link at a location spaced from the pivotal mounting of the link to the stretcher.
- the movement from the driving position to the non-driving position may be at least initially pivotal movement about the point of contact of the driven wheel with the ground.
- the driven wheel may be larger than the non-driven wheel such as being more than twice the diameter of the non-driven wheel.
- the drive When the wheel is in the driving position the drive may be arranged to be able to act as a brake should the stretcher be going down an incline.
- the arrangement may include a battery arranged to power the drive wheel.
- a battery may be arranged to drive the movement between at least one of the positions.
- the angle of the axis of the driven wheel may be fixed with respect to the longitudinal extent of the stretcher.
- the axis of at least one non-driven wheel may be able to move about an upwardly extending axis and may be selectively lockable in at least one position of the upwardly extending axis.
- the driven wheel may be located between non-driven wheels in the direction of longitudinal extent of the stretcher.
- the non-driven wheel may be located towards one end of the stretcher in the region of a support extending up from a lower region of the trolley to a patient support for a body.
- the driven wheel may be pivotally connected to the support.
- the driven wheel and the non-driven wheel may be located in the region of the support with each being either side of the support in the longitudinal extent of the trolley.
- a method of operating a stretcher that includes at least three non-driven wheels and at least one driven wheel comprising moving at least one of the wheels between a driven position in which the driven wheel is in contact with the ground and a non-driven position in which the driven wheel is spaced from the ground; characterised by: causing a support for a patient located above the region of the driven wheel to move first downwardly and then upwardly when moving from the driven position to the non-driven position.
- the method may comprise causing at least one non-driven wheel to be clear of the ground in the driven position.
- the method may comprise causing the non-driven wheel to be clear of the ground in the driven position at a location spaced from the longitudinal extent of the remaining wheels in contact with the ground.
- the drive means may include, although by no means be limited to, linear lead-screw actuators, hydraulic actuators, or electro-hydraulic actuators.
- the present invention includes any combination as claimed.
- the patient support 4 is mounted on a first support 32, which extends upwardly from the front of the main fame 10, and a second support 34, which extends upwardly from the rear of the main frame 10 so that the patient support 4 is held mainly flat or horizontal.
- the lower end of the second, rear support 34 is fixed to an upwardly extending arm 10a of the main frame 10.
- the upper end region of the second, rear support 34 is connected by a first group of co-operating parts 36 to the patient support 4.
- the lower end region of the first, front support 32 is attached to a piston of a first linear actuator 38 by a second group of co-operating parts 40.
- the upper end region of the first support 32 is connected by a third group of co-operating parts 42 to the patient support 4.
- the lower end of the actuator 38 is fixed to an upwardly extending arm 10b of the main frame 10.
- the configuration of the patient support 4, the first support 32, the second support 34, the first linear actuator 38, and the three groups of co-operating parts 36,40 and 42 is such that the first linear actuator may be driven to extend or contract a piston 38a of the linear actuator in order to incline or decline the angle of the patient support 4.
- the patient support 4 When inclined, the patient support 4 may, for instance, be raised up to 15° to drain fluid from the legs of a patient on the support 4 with pivot occurring about the parts 36.
- the first linear actuator 38 may be controlled by an operator controlling a two-position or multi-position switch, such as a rocker switch, which may be positioned at the rear of the trolley.
- a battery 56 mounted on the main frame 10 is able to power the actuator 38 in order to extend or contract the piston 38a using any well known method.
- the main frame 10 provides the housing for the two front castor wheels 6a and 6b.
- the castor wheels 6a and 6b are aligned substantially in the same plane and at the first trolley end region and are spaced apart laterally across the stretcher, generally being positioned on the widest portion of the main frame 10.
- the front castor wheels are able to rotate about a horizontal axis and can swivel about a vertical axis on a stub shaft 47, offset from the horizontal axis.
- the rear castor wheels 6c and 6d are able to rotate in the same way as the front castor wheels.
- a sub frame comprising two side rails 50 and two cross rails 52 is pivotally mounted at points 20 on the main frame 10 at the rear end such that the sub frame 16 is able to pivot about a horizontal axis.
- Rear castor wheels 6c and 6d are located on the rearward projecting end region of the sub frame 16.
- the castor wheel stub axles 48 of the rear castor wheels pivot with the sub frame about the pivot points 20.
- the driven wheels 8 are mounted on axles 54 that project from a forward region of the sub frame, spaced from the pivot points 20 of the sub frame.
- the battery 56 powers a motor 58 mounted on the axle 54 or the sub frame 16 in order to drive the axle 54 and subsequently the wheels 8 in any well known manner.
- the motor may impart a drive via an induction force being applied to a magnet fast with the axles 54.
- a second actuator 60 controls the movement of the sub frame 16 about the pivot points 20.
- the second actuator 60 is rotatably fixed at the upper end to the upwardly extending arm 10a just forward of that arm.
- the lower end of the actuator 60 is pivotally connected to the axle 54 of the sub frame 6 such that when the piston 66 of the second actuator 60 is extended or contracted the point at which the actuator 60 is located on the sub frame 16 moves up or down through a circumferential path by rotating about the pivot points 20.
- the battery 56 powers the actuator 60 to extend or contract a piston 66 of the actuator.
- a two-position switch such as a rocker switch, which may be positioned at the rear end of the trolley and controlled by an operator, may control the extension or contraction of the actuator 60.
- the stretcher can be moved by an operator at the rear of the trolley using a lever, which initiates and varies the speed of rotation of the drive shaft from the motor and the speed of travel of the trolley.
- the lever can be moved in an opposite direction to initiate and vary the speed of reverse rotation of the axle 54.
- the motor may include a positive drive that prevents the axle 54 from being able to rotate faster than that set by the lever to prevent the runaway of the stretcher down inclines.
- the actuator piston 66 may contract to initiate the transition to the first position 22. Alternatively the actuator may relax such that all driven and non driven wheels contact the ground.
- a telescopic lever 31 held fast to the sub frame is extended from the sub frame 16 by any well-known means.
- the actuator piston 66 is unloaded such that the co-operating parts of the actuator 60 do not resist rotational movement of the sub frame 16.
- a downwards force exerted on the lever 31 by the hand or foot of an operator acts to rotate the sub frame 16 in to the first transition position.
- the actuator piston 66 may be re-locked in order to impart the necessary rotational movement of the sub frame 16 or the lever may be moved sideways to engage with a locking part of the main frame. Return movement and locking is a reverse of this operation.
- the pistons may comprise linear actuators whereby a nut is axially fixed but rotated to drive the piston axially with regard to the rotation of the nut.
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Nursing (AREA)
- Handcart (AREA)
- Weting (AREA)
- Invalid Beds And Related Equipment (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
- The present invention relates to a stretcher and a method of operating a stretcher. Herein any reference to a stretcher includes a stretcher trolley.
- Stretchers are presently manoeuvred manually by an operator who exerts the forces required to direct and move the stretcher about hospital ward, between wards, between ambulances and between ambulances and incidents. During the course of manoeuvring the stretcher the operator has to exert a considerable force in order to control the stretcher. The effect can be bad for the back of the operator. The force is increased when manoeuvring the stretcher up steep inclines or ramps, such as an ambulance ramp or hospital ramp. Furthermore, the wheels of the stretcher are mounted on swivels, which, particularly if the ramp tilts to one side (such as may occur when the vehicle is not parked on level ground), as the operator pushes the stretcher up it can run off the stretcher. In addition the stretcher can run off course when going up or down hill or on a slope. Alternatively, the stretcher can run away down hill if on a steep hill or if the operator slips and loses grip. All of these problems are accentuated when the patient on the stretcher is particularly heavy.
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US-A-2003/0159861 discloses a wheeled carriage for supporting a patient in a substantially horizontal position. A control apparatus controls the wheel support structure to move the auxiliary wheels between a first deployed position whereat castered wheels one end of the carriage are elevated from a floor surface, and a second stored position with the auxiliary wheels out of engagement with the floor surface. This document provides basis for the pre-characterising portion of independent claim 1 and claim 13 appended hereto. -
EP-A-0769286 discloses a further patient transfer apparatus having casters disposed at four locations on a frame, and a drive mechanism which is elevatable with respect to the frame. - It is an object of the present invention to attempt to overcome at least some of the above or other disadvantages.
- According to one aspect of the present invention a stretcher includes at least three non-driven wheels and at least one driven wheel, the driven wheel being moveable relative to at least one of the non-driven wheels between a driven position in which the driven wheel is in contact with the ground and a non-driven position in which the driven wheel is spaced from the ground, characterised by: the stretcher being adapted such that the height of a patient support above the ground, in the region of the driven wheel first decreases and then increases as movement occurs between the two positions.
- At least one of the driven wheels or a non-driven wheel may be moveably mounted on the stretcher in order to effect the movement between the two positions.
- In the travelling position at least one of the non-driven wheels may be spaced on the ground. The driven wheel may be pivotally mounted on the stretcher about an axis offset from that wheels rotational axis to effect the movement between the driven and non-driven positions.
- The movement in at least one direction between the positions may be effected by driving means.
- The drive means may be arranged to hold the stretcher in at least one of the positions with the hold being exerted in at least one of the positions being releasable.
- The movement from at least one position to another may be effected by manual movement of a telescopic arm.
- The movement in at least one direction between the positions may be effected by driving means which may include an extendable and contractible member pivotably connected to the stretcher and a link at a location spaced from the pivotal mounting of the link to the stretcher.
- The movement from the driving position to the non-driving position may be at least initially pivotal movement about the point of contact of the driven wheel with the ground.
- The driven wheel may be larger than the non-driven wheel such as being more than twice the diameter of the non-driven wheel.
- When the wheel is in the driving position the drive may be arranged to be able to act as a brake should the stretcher be going down an incline.
- The arrangement may include a battery arranged to power the drive wheel. A battery may be arranged to drive the movement between at least one of the positions.
- The angle of the axis of the driven wheel may be fixed with respect to the longitudinal extent of the stretcher.
- The axis of at least one non-driven wheel may be able to move about an upwardly extending axis and may be selectively lockable in at least one position of the upwardly extending axis.
- The driven wheel may be located between non-driven wheels in the direction of longitudinal extent of the stretcher.
- The non-driven wheel may be located towards one end of the stretcher in the region of a support extending up from a lower region of the trolley to a patient support for a body. The driven wheel may be pivotally connected to the support. The driven wheel and the non-driven wheel may be located in the region of the support with each being either side of the support in the longitudinal extent of the trolley.
- According to a further aspect of the present invention there is provided a method of operating a stretcher that includes at least three non-driven wheels and at least one driven wheel comprising moving at least one of the wheels between a driven position in which the driven wheel is in contact with the ground and a non-driven position in which the driven wheel is spaced from the ground; characterised by: causing a support for a patient located above the region of the driven wheel to move first downwardly and then upwardly when moving from the driven position to the non-driven position.
- The method may comprise causing at least one non-driven wheel to be clear of the ground in the driven position. The method may comprise causing the non-driven wheel to be clear of the ground in the driven position at a location spaced from the longitudinal extent of the remaining wheels in contact with the ground.
- Further features of the present invention are defined in the claims.
- The drive means may include, although by no means be limited to, linear lead-screw actuators, hydraulic actuators, or electro-hydraulic actuators.
- The present invention includes any combination as claimed.
- The present invention can be carried into practice in various ways but several embodiments will now be described, by way of example, with reference to the accompanying drawings, in which:-
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Figure 1 is a side perspective view of astretcher trolley 2 showing the patient support 4,castor wheels wheel 8 and amain frame 10; -
Figures 2 and3 are a side perspective and rear perspective view of the reartrolley end region 12 showing therear castor wheels wheels 8 connected to asub frame 16. Thesub frame 16 is assembled to themain frame 10 at a fixedpivot point 20 to enable it to rotate about a first axis; -
Figure 4 is a side view of afirst transition position 22 showing therear castor wheels surface 24 and the drivenwheels 8 free from thesurface 24 such that thestretcher trolley 2 is solely supported by castor wheels. -
Figure 5 is a side perspective view of amid transition position 28 showing the drivenwheels 8 and all castor wheels in contact with thesurface 24; -
Figure 6 is a side perspective view of asecond transition position 30 showing the drivenwheels 8 in contact with thesurface 24 with the rear castor wheels clear from thesurface 24 such that the trolley is solely supported by thefront castor wheels wheels 8; and -
Figures 7 and 8 show side views in the two transition positions effected by pulling alever 31 down. - As shown in
Figures 1 and 2 , the patient support 4 is mounted on afirst support 32, which extends upwardly from the front of themain fame 10, and asecond support 34, which extends upwardly from the rear of themain frame 10 so that the patient support 4 is held mainly flat or horizontal. - The lower end of the second,
rear support 34 is fixed to an upwardly extendingarm 10a of themain frame 10. The upper end region of the second,rear support 34 is connected by a first group ofco-operating parts 36 to the patient support 4. - The lower end region of the first,
front support 32 is attached to a piston of a firstlinear actuator 38 by a second group ofco-operating parts 40. The upper end region of thefirst support 32 is connected by a third group ofco-operating parts 42 to the patient support 4. The lower end of theactuator 38 is fixed to an upwardly extendingarm 10b of themain frame 10. The configuration of the patient support 4, thefirst support 32, thesecond support 34, the firstlinear actuator 38, and the three groups ofco-operating parts piston 38a of the linear actuator in order to incline or decline the angle of the patient support 4. When inclined, the patient support 4 may, for instance, be raised up to 15° to drain fluid from the legs of a patient on the support 4 with pivot occurring about theparts 36. - The first
linear actuator 38 may be controlled by an operator controlling a two-position or multi-position switch, such as a rocker switch, which may be positioned at the rear of the trolley. Abattery 56 mounted on themain frame 10 is able to power theactuator 38 in order to extend or contract thepiston 38a using any well known method. - The
main frame 10 provides the housing for the twofront castor wheels castor wheels main frame 10. The front castor wheels are able to rotate about a horizontal axis and can swivel about a vertical axis on a stub shaft 47, offset from the horizontal axis. - The
rear castor wheels - As shown in relation to
figures 2 and3 , a sub frame comprising twoside rails 50 and twocross rails 52 is pivotally mounted atpoints 20 on themain frame 10 at the rear end such that thesub frame 16 is able to pivot about a horizontal axis. -
Rear castor wheels sub frame 16. The castor wheel stub axles 48 of the rear castor wheels pivot with the sub frame about thepivot points 20. - The driven
wheels 8 are mounted onaxles 54 that project from a forward region of the sub frame, spaced from the pivot points 20 of the sub frame. Thebattery 56 powers amotor 58 mounted on theaxle 54 or thesub frame 16 in order to drive theaxle 54 and subsequently thewheels 8 in any well known manner. For instance, the motor may impart a drive via an induction force being applied to a magnet fast with theaxles 54. - A
second actuator 60 controls the movement of thesub frame 16 about the pivot points 20. Thesecond actuator 60 is rotatably fixed at the upper end to the upwardly extendingarm 10a just forward of that arm. The lower end of theactuator 60 is pivotally connected to theaxle 54 of the sub frame 6 such that when thepiston 66 of thesecond actuator 60 is extended or contracted the point at which theactuator 60 is located on thesub frame 16 moves up or down through a circumferential path by rotating about the pivot points 20. - The
battery 56 powers theactuator 60 to extend or contract apiston 66 of the actuator. A two-position switch, such as a rocker switch, which may be positioned at the rear end of the trolley and controlled by an operator, may control the extension or contraction of theactuator 60. - It should be clear from
Figure 4 ,5 and 6 that extending thepiston 66 of theactuator 60 effects a movement between the first, mid and second transition positions. In the second transition position the co-operating parts of theactuator 60 resist any rotational movement of thesub frame 16. During the transition between thefirst position 22 and thesecond position 30 the inclination of the patient support 4 changes only marginally. It can be seen that as the rear of the trolley is being moved between the position showing inFigures 7 and 8 the castor wheels are moved down, initially, to cause a slight lowering of the pivot points 20 about the contact of the driven wheels with the ground until the castors contact the ground. Then the pivot points 20 are raised slightly about the contact point of the castors with the ground. Accordingly the inclination change of the patient support 4 is minimal and the support is at substantially the same inclination regardless of the positions between those shown inFigure 7 and 8 . - It is possible to lock the castors in a fixed rotational position about the stub axles 48. Thus, if the stub axles are locked in the position shown in
Figure 8 when, or after the driven wheels only at the rear contact the ground, as inFigure 7 , there is significant clearance for the trolley to negotiate small steps or ledges without the rear castor wheels contacting the step or ledge. In the locked position the tangent between the raised castor wheels and the driven wheels and the included angle to the horizontal may be more than 8° or more than 10° or in the region of 12° - 15°. - When the second
trolley end region 12 is orientated in the second transition position, the stretcher can be moved by an operator at the rear of the trolley using a lever, which initiates and varies the speed of rotation of the drive shaft from the motor and the speed of travel of the trolley. Similarly, the lever can be moved in an opposite direction to initiate and vary the speed of reverse rotation of theaxle 54. The motor may include a positive drive that prevents theaxle 54 from being able to rotate faster than that set by the lever to prevent the runaway of the stretcher down inclines. - Furthermore, it will be appreciated that not all of the power to move the stretcher need be applied by the motor and an operator could assist in providing the necessary power.
- Should the motor fail or should it be desired to manoeuvre the stretcher in a traditional manner using both sets of
castor wheels actuator piston 66 may contract to initiate the transition to thefirst position 22. Alternatively the actuator may relax such that all driven and non driven wheels contact the ground. - Should the battery fail the transition means may be effected manually as depicted by
figures 7 and 8 . Atelescopic lever 31 held fast to the sub frame is extended from thesub frame 16 by any well-known means. Theactuator piston 66 is unloaded such that the co-operating parts of theactuator 60 do not resist rotational movement of thesub frame 16. A downwards force exerted on thelever 31 by the hand or foot of an operator acts to rotate thesub frame 16 in to the first transition position. Theactuator piston 66 may be re-locked in order to impart the necessary rotational movement of thesub frame 16 or the lever may be moved sideways to engage with a locking part of the main frame. Return movement and locking is a reverse of this operation. - The pistons may comprise linear actuators whereby a nut is axially fixed but rotated to drive the piston axially with regard to the rotation of the nut.
Claims (17)
- A stretcher (2) including at least three non-driven wheels (6a,6b,6c,6d) and at least one driven wheel (8), the driven wheel (8) being movable relative to at least one of the non-driven wheels (6a,6b,6c,6d) between a driven position in which the driven wheel (8) is in contact with the ground and a non-driven position in which the driven wheel is spaced from the ground;
characterised by:the stretcher (2) being adapted such that the height of a patient support (4) above the ground, in the region of the driven wheel, first decreases and then increases as movement occurs between the two positions. - The stretcher as claimed in claim 1 in which the height of a patient support (4) above the region of the driven wheel (8) is substantially the same in both positions.
- The stretcher as claimed in any preceding claim in which, in the driving position at least one of the non-driven wheels (6c,6d) is spaced from the ground and is spaced from the extent between the non-driven wheels (6c,6d) in contact with the ground and the driven wheels (8).
- The stretcher as claimed in claim 3 in which a non-driven wheel (6c,6d) that is spaced from the ground is rotatable about its own wheel axis and a further axis spaced from that axis whereby the non-driven wheel (6c,6d) can be moved about that further axis and locked in position about that further axis to move that non-driven wheel (6c,6d) further from the ground.
- The stretcher as claimed in claim 4 in which that further axis is an upwardly extending axis.
- The stretcher as claimed in any preceding claim in which at least one non-driven wheel (6c, 6d) is pivotally mounted on the stretcher (2) about an axis offset from the rotational axis of the non-driven wheel(6c, 6d) to effect the movement between the positions.
- The stretcher as claimed in claim 6 in which the driven wheel (8) is pivotally mounted on the stretcher (2) about an axis offset from the rotational axis of the driven wheel (8) to effect the movement between the driven and non-driven positions and in which the driven wheel (8) and the non-driven wheel (6c, 6d) are connected to a link (50) that is pivotally mounted on the stretcher (2) with, in the longitudinal extent of the stretcher (2), the pivot axis of the driven wheel (8) being on one side of the pivotal mounting of the link (50) on the stretcher (2) and the pivot axis of the non-driven wheel (6c, 6d) being on the other side.
- The stretcher as claimed in any preceding claim in which the movement in at least one direction between the positions is effected by drive means (60) and in which the drive means (60) are arranged to hold the stretcher in at least one of the positions.
- The stretcher as claimed in any preceding claim in which the movement from at least one position to another is effect manually.
- The stretcher as claimed in claim 9 in which the movement is effected by means of a lever (31).
- The stretcher as claimed in claim 10 when dependent on claim 8 in which the link (50) is constrained to move with the lever (31) about the pivot axis of the link (50).
- The stretcher as claimed in claim 11 in which the lever (31) is movable to a locking condition to restrain pivotal movement of the link (50) in at least one position.
- The stretcher as claimed in claim 12 when dependent on claim 8 in which the pivotal connection of the drive means (60) to the link (50) is coincident with the pivot axis of at least one of the driven wheel or a non-driven wheel.
- The stretcher as claimed in any preceding claim in which the stretcher (2) is adapted such that the movement from the driving to the non-driving position is at least initially pivotal movement about the point of contact of the driven wheel (8) with the ground and is, at least towards the end of that movement, pivotal movement about the contact of the at least one non-driven wheel (6c,6d).
- A method of operating a stretcher that includes at least three non-driven wheels (6a,6d) and at least one driven wheel (8) comprising moving at least one of the wheels (6a,6d,8) between a driven position in which the driven wheel (8) is in contact with the ground and non-driven position in which the driven wheel (8) is spaced from the ground;
characterised by:causing a support (4) for a patient located above the region of the driven wheel (8) to move first downwardly and then upwardly when moving from the driving position to the non-driving position. - The method as claimed in Claim 15 comprising moving the driven wheel (8) and at least said one non-driven wheel (6c,6d) when moving between the positions.
- The method as claimed in claim 15 or 16 comprising at least one said non-driven wheel (6c,6d) and at least one said driven wheel (8) being connected and pivoting about a common axis to cause the movement from the driving to the non-driving position.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB0505447A GB2424215A (en) | 2005-03-17 | 2005-03-17 | Power-assisted stretcher |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1702600A1 EP1702600A1 (en) | 2006-09-20 |
EP1702600B1 true EP1702600B1 (en) | 2008-12-17 |
Family
ID=34509196
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP06250692A Not-in-force EP1702600B1 (en) | 2005-03-17 | 2006-02-09 | Stretcher |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1702600B1 (en) |
AT (1) | ATE417587T1 (en) |
DE (1) | DE602006004233D1 (en) |
GB (1) | GB2424215A (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011016054A2 (en) * | 2009-08-03 | 2011-02-10 | Subhav Sinha | Dynamically stabilized personal transporter |
CN109248030A (en) * | 2018-10-05 | 2019-01-22 | 丁君浩 | A kind of medical treatment bed transport and mating medical telescopic mechanism |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5083625A (en) * | 1990-07-02 | 1992-01-28 | Bleicher Joel N | Powdered maneuverable hospital cart |
JP3006672B2 (en) | 1995-09-25 | 2000-02-07 | 直人 藤井 | Transport equipment |
JP2000107230A (en) * | 1998-10-09 | 2000-04-18 | S N Seiki:Kk | Fitting unit of stretcher |
US6772850B1 (en) * | 2000-01-21 | 2004-08-10 | Stryker Corporation | Power assisted wheeled carriage |
AU2001259757A1 (en) * | 2000-05-11 | 2001-11-20 | Hill-Rom Services, Inc. | Motorized traction device for a patient support |
US6752224B2 (en) * | 2002-02-28 | 2004-06-22 | Stryker Corporation | Wheeled carriage having a powered auxiliary wheel, auxiliary wheel overtravel, and an auxiliary wheel drive and control system |
US6725956B1 (en) * | 2003-05-06 | 2004-04-27 | Stryker Corporation | Fifth wheel for bed |
-
2005
- 2005-03-17 GB GB0505447A patent/GB2424215A/en not_active Withdrawn
-
2006
- 2006-02-09 DE DE602006004233T patent/DE602006004233D1/en not_active Expired - Fee Related
- 2006-02-09 EP EP06250692A patent/EP1702600B1/en not_active Not-in-force
- 2006-02-09 AT AT06250692T patent/ATE417587T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
GB2424215A (en) | 2006-09-20 |
ATE417587T1 (en) | 2009-01-15 |
DE602006004233D1 (en) | 2009-01-29 |
GB0505447D0 (en) | 2005-04-20 |
EP1702600A1 (en) | 2006-09-20 |
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