Hoist apparatus

Abstract

A hoist apparatus for use with a hoist for lifting a load is described. The hoist apparatus includes an elongate load bearing member having a longitudinal axis and at least two support points spaced apart along the longitudinal axis. An intermediate support member includes a hoist connection element for connecting the intermediate support member to a hoist, and at least first and second support point connection elements each connecting the intermediate support member to a respective support point of the elongate load bearing member. The first support point connection element is spaced a first distance from the hoist connection element, and the second support point connection element is spaced a second distance from the hoist connection element. Adjustment means adjusts at least one of the first and second distances so as to adjust the orientation of the longitudinal axis of the elongate load bearing member relative to the horizontal.

Claims

1. A hoist apparatus for use with a hoist for lifting a load, the hoist apparatus comprising: an elongate load bearing member having a longitudinal axis and comprising elongate frame members and at least one cross strut connecting the elongate frame members; an intermediate support member comprising: a first frame member and a second frame member connected to the first frame member; a hoist connection element for connecting the intermediate support member to the hoist; and at least first and second support point connection elements each connecting the intermediate support member to a respective support point of the elongate load bearing member, the first support point connection element being spaced a first distance from the hoist connection element and connecting the intermediate support member to the cross strut and the second support point connection element being spaced a second distance from the hoist connection element and connected to one of the elongate frame members; a motor unit controlling a linear actuator that adjusts the angle of the longitudinal axis of the elongate load bearing member relative to the horizontal plane, the linear actuator being connected to the first frame member adjacent the first support point connection element and connected to the hoist connection element; and a control device having an angle sensor for determining the orientation of the longitudinal axis of the elongate load bearing member relative to the horizontal.

2. The hoist apparatus according to claim 1, wherein the elongate load bearing member is detachable from the intermediate support member.

3. The hoist apparatus according to claim 1, wherein the elongate load bearing member comprises at least one of a stretcher frame, or a stretcher comprising a stretcher frame and a sling for attachment to the stretcher frame.

4. The hoist apparatus according to claim 1, wherein the intermediate support member comprises a substantially longitudinal axis along which the at least first and second support point connection elements of the intermediate support member are spaced.

5. The hoist apparatus according to claim 4, wherein the elongate load bearing member is connected to a frame member of the intermediate support member such that the longitudinal axes of the elongate load bearing member and the intermediate support member lie in substantially the same horizontal plane.

6. The hoist apparatus according to claim 1, wherein the intermediate support member comprises a substantially longitudinal axis along which the at least first and second support point connection elements of the intermediate support member are spaced, wherein a frame member of the intermediate support member is substantially planar and lies substantially in a first plane, and wherein the elongate load bearing member is substantially planar, lies substantially in a second plane, and is connected to the first frame member of the intermediate support member such that the first and second planes are substantially coincident.

7. The hoist apparatus according to claim 1, wherein at least one of the at least two support points of the elongate load bearing member and the connected support point connection element of the intermediate support member include a locking means to secure the elongate load bearing member and the intermediate support member together.

8. The hoist apparatus according to claim 1, wherein the control device is programmed to automatically adjust the angle of the longitudinal axis of the elongate load bearing member to a predetermined angle relative to the horizontal plane.

9. The hoist apparatus according to claim 8, wherein if the angle of the longitudinal axis of the elongate load bearing member relative to the horizontal is equal to the predetermined angle, the motor unit does not operate, and wherein if the angle of the longitudinal axis of the elongate load bearing member relative to the horizontal is greater than or less than the predetermined angle, the motor unit operates in a direction to move the elongate load bearing member toward the predetermined angle.

10. A hoist apparatus for use with a hoist for lifting a load, the hoist apparatus comprising: an elongate load bearing member configured as a stretcher for supporting a patient in a supine position, wherein the stretcher has a longitudinal axis with a stretcher frame comprising elongate frame members and a cross strut connecting the elongate frame members, the stretcher frame connected to a sling for supporting a patient in a supine position and comprises at least two support points, wherein one support point is located on the cross strut; an intermediate support member including: a hoist connection element for connecting the intermediate support member to the hoist; and wherein at least first and second support point connection elements of the intermediate support member are detachably connected to a respective support point of the elongate load bearing member, the first support point connection element being spaced a first distance from the hoist connection element and connecting the intermediate support member to the cross strut and the second support point connection element being spaced a second distance from the hoist connection element and connected to one of the elongate frame members; and a motor unit controlling a linear actuator that adjusts the angle of the longitudinal axis of the elongate load bearing member relative to the horizontal plane, the linear actuator being connected to the intermediate support member adjacent the first support point connection element and connected to the hoist connection element.

11. The hoist apparatus of claim 1, wherein the control device is programmed or configured to: a. receive, from the angle sensor, the actual angle of the stretcher frame relative to the horizontal; b. compare the actual angle to a desired angle; c. if the actual angle is different from the desired angle, instruct the motor unit to move the linear actuator in a direction to move the stretcher towards the desired angle; and d. repeat steps a-c. until the actual angle matches the desired angle.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a first hoist apparatus;

(2) FIGS. 2A, B and C illustrate stages of a method for assembling the first hoist apparatus, as shown in FIG. 1;

(3) FIG. 3 is a flow chart showing steps involved in adjusting the orientation of the hoist apparatus shown in FIGS. 2A-C;

(4) FIG. 4 shows attachment means for securing the stretcher frame to a support;

(5) FIG. 5 shows attachment features provided on a stretcher frame for attaching the stretcher frame to a stretcher sling;

(6) FIG. 6 shows an attachment means provided on a stretcher sling for attaching the sling to e stretcher frame;

(7) FIG. 7 shows a second hoist apparatus;

(8) FIG. 8 shows a support of a third hoist apparatus;

(9) FIG. 9 shows an alternative stretcher frame and part of a further support;

(10) FIGS. 10A, 10B and 10C show stages of a method of use of an alternative attachment means for securing the stretcher frame to a support; and

(11) FIG. 11 shows alternative attachment means provided on a stretcher sling for attaching the stretcher sling to the stretcher frame.

DETAILED DESCRIPTION

(12) FIG. 1 shows a first hoist apparatus 2 for attachment to a ceiling lift. The hoist apparatus comprises an intermediate support member, in the form of support 4, attached to an elongate load bearing member, in the form of a stretcher frame 6. The stretcher frame 6 has support points in the form of an attachment hook 24 and attachment recesses 21. The stretcher frame 6 is attached to a stretcher sling 28, the stretcher frame 6 and stretcher sling 28 forming a stretcher 5.

(13) The support 4 comprises first 10 and second 8 members. The second member 8 has a hoist connection element in the form of a hoist attachment 12 for attachment to a lifting strap of a ceiling lift or the jib of a floor lift. The first member 10 has support point connection elements in the form of first and second attachment points 14, 19 for attachment to the stretcher frame 6. The attachment points 14,19 are located first and second distances respectively from the hoist attachment 12.

(14) The support 4 further comprises an adjustment means in the form of a linear actuator 16. The linear actuator 16 is controlled by a motor unit. The linear actuator 16 can be controlled using push buttons 17 provided on the stretcher frame. The push buttons are in infrared communication with the motor unit of the linear actuator 16. Such a support 4 can be known as a motorized spreader bar, as its movement is motorized and it spreads the load of a stretcher attached to it across the support.

(15) The first 10 and second 8 members each have a generally U-shape form comprising two limbs. The limbs of the first member 10 are bent away from the general plane of the U-shape, in a direction perpendicular to the plane of the U-shape. The ends of the two limbs of the second member 8 are pivotally connected to the limbs of the first member 10 at a pivotal connection point 9, such that the ends of the limbs of the first member 10 protrude beyond the pivotal connection point 9. A longitudinal axis of the first member 10 of the support lies substantially parallel to the length of the limbs of first member, through the apex of the first member. The longitudinal axis thus dissects the first member.

(16) The hoist attachment 12 for attachment to a hoist device is located at or near the centre of the apex of the U-shaped second member 8. The first attachment point 14 for attachment to the stretcher frame 6 is located at or near the centre of the apex of the U-shaped first member 10. The second attachment points 19 for attachment to the stretcher frame 6 are located on the limbs of the first member 10. The linear actuator 16 connects the apices of the first and second generally U-shaped members 10,8 to each other. In this arrangement the linear actuator 16 is substantially vertical.

(17) Contraction or extension of the linear actuator 16 causes the first member 10 to pivot about pivot point 9 and thus changes the position of attachment points 14,19 for attachment to the stretcher frame 6 relative to the hoist attachment 12. When in use, actuation of the linear actuator can thus adjust the distances between each of the attachment points 14,19 and the hoist attachment 12 so as to adjust the orientation of the stretcher frame 6 relative to the horizontal. Thus the orientation of a loaded stretcher 5 attached to the support 4 can be adjusted relative to the horizontal, and the load supported can therefore be substantially horizontally balanced as required.

(18) The stretcher frame 6 comprises a generally H-shaped body having two substantially parallel struts 18,20, and a cross strut 22 joining the substantially parallel struts 18,20. A longitudinal axis of the stretcher frame 6 lies substantially parallel to length of the struts, through the centre of the cross strut 22. The stretcher frame 6 comprises essentially a single unit. The stretcher frame 6 has an attachment hook 24 for attachment to the first attachment point 14 on the first member 10 of the support 4, the attachment hook 24 being located at or near the centre of the cross strut 22. The stretcher frame 6 further has attachment recesses 21 for attachment to the second attachment points 19 on the first member 10 of the support.

(19) The stretcher frame 6 further comprises six attachment points 30 for attachment to a stretcher sling 28, three on each of the substantially parallel struts 18,20. The attachment points 30 are positioned proximate to each end of each of the substantially parallel struts 18,20 and at or near the centre of each of the substantially parallel struts 18,20. The stretcher sling 28 comprises six attachment straps and associated clips 32 for attachment to the attachment points 30 on the stretcher frame 6.

(20) The stretcher-frame 6 consists of a structure that can take up the spread load from the lifted body. The stretcher frame 6 is made from steel. Other suitable materials having sufficient stiffness and strength include aluminum or composite materials.

(21) The second attachment points 19 located on the limbs of the first member 10 comprise lugs (15, see FIGS. 2A,B,C) located proximate the end of each limb. The attachments points 14,19 on the first member 10 of the support 4 may be suitable for attachment to a known sling, such as a chair sling. The support shown in FIG. 1 is known from EP2037857 as a motorized adjustable spreader bar. In EP2037857 a flexible chair sling is hung by flexible connections from the adjustable spreader bar, for lifting patients in a predominantly seated style. By enabling the stretcher frame to easily attach to the already existing chair sling attachment points the stretcher frame can be retro-fitted onto existing motorized spreader bars.

(22) FIGS. 2A B and C illustrate stages of a method for assembling the first hoist apparatus 2 as shown in FIG. 1. FIG. 2A illustrates how the stretcher frame 6 can be easily attached to the support 4 using attachment hook 24 to hook (motion following arrow A) the stretcher frame 6 to the first attachment point 14 of the first member 10 of the support. The enlarged view of the first attachment point 14 shows the lugs 15 over which the attachment hook 24 hooks.

(23) In FIG. 2B the stretcher frame 6 is then rotated about the attachment hook 24/first attachment point 14 connection to bring the ends of the limbs of the first member 10 into line with the struts of the stretcher frame 6 (motion following arrow B). The attachment recesses 21 on the struts of the stretcher frame 6 are then attached to the lugs 15 of the second attachments points 19. In this way the attachment points 14,19 for attaching the support to a chair sling are used for attaching the support to the stretcher frame and thus cannot be used to incorrectly connect a sling body directly to the support.

(24) FIG. 2C shows a sling body 28 attached to the stretcher frame 6 which is in turn connected to the support 4, as described with reference to FIG. 1. Substantial horizontal balancing of the stretcher 5 can be performed by operating the motorized linear actuator 16 through an interface with push-buttons (17, FIG. 1) which is in wireless infrared contact with the motor unit of the linear actuator. As can be seen in FIG. 2C the stretcher frame 6 is attached to the first member 10 of the support 4 so that the stretcher frame and first member are substantially in line with one another. The horizontal planes of the stretcher frame 6 and first member 10 are substantially coincident. In this way the hoist apparatus interferes as little as possible with the effective stroke of the hoist to which it is attached. This is in contrast to prior art stretchers which are hung below the hoist or intermediate member and thus occupy more of the effective stoke of the hoist.

(25) Here, the motor-unit is able to adjust the relative positions of the parts of the support, and thus the relative distances of the attachment points 14,19 on the second member of the support and the hoist attachment 12, automatically (i.e. without the user being involved). In order to achieve this, the stretcher frame 6 is provided with a control device having an angle sensor, in the form of an accelerometer, for determining the angle of the stretcher frame in relation to the horizontal plane. The control device further comprises a component for sending control commands to the motor-unit, based on the determined angle of the stretcher frame in relation to the horizontal plane and a preset desired angle, to control movement of the motor unit and thus of the hoist apparatus. In this way the control device can control movement of the hoist apparatus to achieve a desired preset angle of the stretcher frame. A tilt sensor, camera, or other device for measuring an angle may be used in place of the accelerometer.

(26) FIG. 3 is a flow chart showing steps involved in adjusting the orientation of the hoist apparatus shown in FIGS. 2A-C. In a first step 200 the actual angle of the stretcher frame relative to the horizontal is measured. In a second step 210, the value of the actual angle measurement is compared to a desired angle (Set angle+Precision). If the two are equal, a signal is sent to the motor to stop further movement 220. If the value of the actual angle measurement is greater than or less than the desired angle (Set angle+Precision), a signal is sent to the motor to cause the motor to move in the direction required to move the stretcher towards the desired angle 230,240. The first step 200 is then repeated, i.e. the actual angle of the stretcher flame relative to the horizontal is measured again and the process repeats until the actual angle measurement and the desired angle (Set angle+Precision) are equal, when the motor is stopped.

(27) FIG. 4 shows a locking means 150, located on the stretcher frame 144, for securing the stretcher flame 144 to an attachment lug 148 of the first member 146 of the support. The locking means 150 is used as an extra precaution to prevent the first member 146 of the support and stretcher frame 144 from becoming unintentionally detached from one another during use, or from slipping with respect to one another so as to jolt the patient.

(28) The locking means 150 comprises a recess or suspension point 152 which is brought into engagement with the lug 148 of the first member 146 of the support, and a latch 154 which locks the suspension point 152 relative to the lug 148. The latch follows linear motion arrow D to lock the suspension point 152 relative to the lug 148. Thus the first member 146 of the support and stretcher frame 144 should only be able to be detached from one another when the user applies unlocks the latch. The resulting equipment is thus safer to use.

(29) The locking means 150, before and after being locked shut using the latch, covers the lug 148 of the first member such that it is not possible to attach a stretcher sling clip to the lug 148.

(30) FIG. 5 shows attachment features on a stretcher frame used for attaching a sling body 28 to a stretcher frame 6. As shown in FIG. 1, the stretcher frame 6 has six attachment points in the form of lugs 30 for attachment to a stretcher sling 28, three on each of the substantially parallel struts 18,20. It will be understood by the skilled person that the attachment points are arranged so as to spread the load supported by the stretcher sling 28 across the stretcher frame 6. Instead of lugs 30, other attachment means may be used, such as, for example, hooks 31, as shown in the inset to FIG. 5. Loops may be provided on a stretcher sling for cooperation with said hooks 31. Loops are commonly used on known stretcher slings.

(31) FIG. 6 shows attachment means provided on a stretcher sling 28 for attaching the sling to the stretcher frame 6. In FIG. 1 the stretcher sling 28 comprises six attachment straps and associated clips 32 for attachment to the lugs 30 on the stretcher frame. FIG. 6 shows an enlarged image of the clip-sling attachment 32A for attachment to the lugs 30 on the stretcher frame and the strap 32B which passes through the clip 32A and is sewn securely to the stretcher sling 28. Clips are quick and easy to use in order to secure the stretcher sling to a stretcher frame.

(32) FIG. 7 illustrates a second hoist apparatus 40 comprising an intermediate support member in the form of a support 42 and an elongate load bearing member in the form of a stretcher frame 44. Here the support 42 comprises a first support frame 50 and four flexible couplings 46, the flexible couplings are connected to the support frame 50 to a winch member 45. The winch member 45 is approximately cylindrical in shape and has a hoist attachment 48 for attachment to a lifting strap of a ceiling lift. The hoist attachment 48 is located on a first side of the winch member 45, substantially in the centre of the longitudinal length of the cylinder. The four flexible couplings 46 are connected to the winch member 45 on a side of the winch member 45 substantially opposite the first face, two flexible coupling members located at each end of the approximate cylinder and spaced apart around the circumference of the cylinder. The flexible coupling members 46 extend radially away from the winch member 45 to the first support frame 50.

(33) The first support frame 50 has three struts 50a,b,c arranged approximately along three sides of a rectangle. In the arrangement shown in FIG. 7 the first strut 50c is arranged substantially parallel to the longitudinal length of the substantially cylindrical winch member 45. The second strut 50a extends from a first end of the first strut 50c and the third strut 50b extends from a second end of the first strut 50c. Both the second and third struts 50a,b extend from the first strut 50c in the same direction as one another. A first attachment point 52 comprises a bar having lugs for attachment to the stretcher frame 44 is located at or near the centre of the first strut 50c. In this case a longitudinal axis of the first support frame 50 runs substantially parallel to the second and third struts 50a,b and through the centre of the third strut 50c.

(34) Each of the four flexible coupling members, 46, couples to a different corner of the rectangle. The flexible coupling members 46 may be moved independently of one another by an adjustment means in the form of a winch provided in the winch member 45. Movement of the flexible coupling members 46 results in movement of the first support frame 50 relative to the winch member 45 and thus at least of the stretcher frame first attachment point 52 relative to the hoist attachment 48. As such, the distance between the first attachment point 52 and the hoist attachment 48 is adjusted such that the longitudinal axis of the stretcher frame attached to the support can be orientated relative to the horizontal.

(35) As in FIG. 1, the stretcher frame 44 comprises a generally H-shaped body having two substantially parallel struts 54,56, and across strut 58 joining the substantially parallel struts 54,56. Again the longitudinal axis of the stretcher frame 44 lies along the length of the struts, through the centre of the cross strut 58. The stretcher frame comprises essentially a single unit. The stretcher frame 44 has an attachment hook 60 for attachment to the lugs of the first attachment point 52 on the first support frame 50. The attachment hooks 60 are located at or near the centre of the cross strut 58. The stretcher frame has second attachment points 51 for attachment to attachment features (not shown) on the first support member 50. As described with reference to FIGS. 1 and 2A,B,C, the attachments points 51,52 on the first support member 50 may be suitable for attachment to a known sling, such as a chair sling. By enabling the support 42 to easily attach to the described stretcher frame or a chair sling the support 42 is more versatile. Additionally, attachment points 51,52 are in use when the stretcher frame is attached to the support and thus cannot be used to incorrectly connect a sling body directly to the support.

(36) The stretcher frame 44 further comprises six lugs 62 for attachment to a stretcher sling, as described with reference to FIG. 1.

(37) When the hoist is used to lower a patient onto a surface, there is a risk that the hoist apparatus will be lowered too far, thus resulting in some of the weight of the hoist apparatus being borne by the patient. An advantage of a using a hoist comprising a winch with flexible coupling members coupling the winch to a support frame is that any weight resting on a patient when the hoist apparatus is lowered too far may be reduced as compared to, for example, the weight which may rest on a patient where the support of FIG. 1 is used as the hoist apparatus and said apparatus is lowered too far. The flexible coupling members of the winch result in only the weight of the frame being borne by the patient; the weight of the motor part is still supported by the lifting strap.

(38) FIG. 8 illustrates a support 80, for supporting a stretcher frame, of a third hoist apparatus. As in FIG. 1 the support 80 comprises first and second generally U-shaped members 84,82 joined at their apices by a linear actuator 86. The support 80 is arranged such that the linear actuator is a substantially horizontal linear actuator 86.

(39) As in FIG. 1, the second member 82 is pivotally joined at the ends of its limbs to the limbs of the first member 84. The second member 82 comprises a hoist attachment 88 at its apex for fixing the support 80 to the lifting strap of a ceiling lift. The first member 84 comprises a first attachment point 90 at its apex for attachment to a stretcher frame. The first member 84 comprises second attachment points 92 for attachment to a stretcher frame located proximate the ends of each limb. The attachment points 90,92 for attachment to a stretcher frame may be for attachment to a known sling, such as a chair sling. The attachment points 90,92 are flexible attachments having lugs 94 at their ends.

(40) As described with reference to FIG. 1, contraction or extension of the linear actuator 86 causes the first and second members 84,82 to pivot about their pivot joint and thus changes the distance between the hoist attachment 88 for attachment to a ceiling lift's lifting strap and at least the first attachment point 90 for attachment to the stretcher frame. When in use, actuation of the linear actuator adjusts the orientation of a stretcher attached to the support 80 relative to the horizontal, and thus can act to substantially horizontally balance the stretcher.

(41) The skilled person will understand that the distances between the hoist attachment and the stretcher frame attachments can be adjusted by means other than a linear actuator or a winch. Means such as, for example, rotary gearboxes, bellows or sleds may be used.

(42) It will be understood by the skilled person that the motor unit of the linear actuator 16, or any other actuator, may be actuated by various means such as by voice commands, hand or finger movements that express commands, or strain gauges in the stretcher frame that sense the direction of a force is applied to it. The actuation means may be connected to the motor unit by known means such as by cable or some form of wireless interface such as Infrared, Radio or Ultrasound. As there is no need for a dedicated control panel to control the angle of the stretcher, the hoist apparatus may be controlled without manual intervention from the operative. This leaves the operative's hands free to take care of other matters, such as reassuring or calming the patient for example.

(43) It will also be appreciated that the hoist apparatus described could have an attachment point for attachment to the lifting arm of a sling lift, for example, or another lifting device.

(44) FIG. 9 illustrates an alternative stretcher frame. A multi-piece stretcher frame 120 is attached to a first member 122 of a support as shown in FIG. 2. The stretcher frame 120 comprises two generally linear struts 124,126, each strut 124,126 comprising a hook member 130 for attachment to the second member 122 of the support, the attachment hooks 130 are located proximate the linear centre of the struts 124,126. Each strut 124,126 further comprises three spaced attachment lugs or hooks 128 for attachment to a stretcher sling 28. The attachment points 128 are positioned proximal to each end of each of the struts 124,126 and at or near the centre of each of the struts 124,126.

(45) The skilled person will understand that the stretcher frame may be attached to the support by a number of different attachment means, such as for example clips, pegs, ropes, hooks or other links that allow a simple method to assemble and disassemble the stretcher frame from the support. A multi piece stretcher may facilitate compact storage of the parts.

(46) FIGS. 10A, B and C show an alternative locking means 138, located on the stretcher frame 144, for securing the stretcher frame 144 to an attachment lug 148 of the first member 146 of the support. The locking means 138 is used to prevent the first member 146 of the support and stretcher frame 144 from becoming unintentionally detached from one another during use.

(47) The locking means 138 comprises a suspension point 142 which is brought into engagement with the lug 148 of the first member 146 of the support (FIGS. 10A and 10B), and a latch 140 which locks the suspension point 112 relative to the lug 148 (FIG. 10C).

(48) FIG. 10C shows how the latch rotates, following motion arrow C, about the stretcher frame strut to lock the suspension point 142 relative to the lug 148. The latch comprises a compression spring (not shown) which biases the latch into a locked position. The latch remains in a locked position unless the user applies a counter force to unlock it.

(49) Instead of a compression spring, a tension spring, a torsion spring or a weight may be used. The skilled person will understand that instead of the described latch, a fixed lock comprising pins or hooks or other connections that allow a simple method of securing and un-securing the locking of the stretcher frame to the support.

(50) FIG. 11 shows alternative attachment means provided on a stretcher sling and stretcher frame for attaching the stretcher sling and the stretcher frame together. These attachment means are known as loop slings 31A and are suitable for attachment to rings 31B, or to hooks, as shown in the inset of FIG. 5 (31). Both clip slings (as described previously), and loop slings are known types of attachment means for slings.