US20040084950A1 - Seat shell with adjustable support elements - Google Patents
Seat shell with adjustable support elements Download PDFInfo
- Publication number
- US20040084950A1 US20040084950A1 US10/468,534 US46853403A US2004084950A1 US 20040084950 A1 US20040084950 A1 US 20040084950A1 US 46853403 A US46853403 A US 46853403A US 2004084950 A1 US2004084950 A1 US 2004084950A1
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- United States
- Prior art keywords
- seat
- seat shell
- recited
- support element
- bracket
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- 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.)
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Classifications
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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
- A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
- A61G5/10—Parts, details or accessories
- A61G5/1056—Arrangements for adjusting the seat
- A61G5/1067—Arrangements for adjusting the seat adjusting the backrest relative to the seat portion
-
- 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
- A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
- A61G5/10—Parts, details or accessories
- A61G5/1091—Cushions, seats or abduction devices
-
- 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
- A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
- A61G5/10—Parts, details or accessories
- A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
-
- 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
- A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
- A61G5/10—Parts, details or accessories
- A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
- A61G5/121—Rests specially adapted therefor, e.g. for the head or the feet for head or neck
-
- 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
- A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
- A61G5/10—Parts, details or accessories
- A61G5/12—Rests specially adapted therefor, e.g. for the head or the feet
- A61G5/128—Rests specially adapted therefor, e.g. for the head or the feet for feet
-
- 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
- A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
- A61G5/10—Parts, details or accessories
- A61G5/1056—Arrangements for adjusting the seat
- A61G5/1075—Arrangements for adjusting the seat tilting the whole seat backwards
Definitions
- the present invention relates to a seat shell which is provided for attachment to the chassis of a wheelchair or a stroller in particular, having a seat and a backrest, as well as adjustable support elements for supporting the person sitting in the seat shell.
- a plurality of seat shells, permanently or detachably connected to a chassis of a wheelchair are known from the related art. Some have height-adjustable armrests, for example, as adjustable support elements.
- U.S. Pat. No. 4,039,223 describes a wheelchair in which the footrest and the backrest are fixable in different pivoting positions with respect to the seat.
- European Patent Application 911 008 A2 of the Applicant shows a seat shell in which the backrest and the footrest freely pivot with respect to the seat. Furthermore, the backrest is supported by a vertical section of the wheelchair frame. The seat is held pivotably on a slide guide, which allows the seat to move forward, as well as to pivot upwardly. A tensioning device draws the seat back to its surface into its flat position where it rests on the wheelchair frame, the backrest assuming the angled position with respect to the seat. An additional tensioning device prestresses the footrest over its entire pivoting range with respect to the seat so that it is also pivoted into the angled position.
- the movable seat device described in this Application forms an extremely innovative and advantageous device for seating disabled patients suffering from spastic extension spasms.
- spastic muscle spasms cause uncontrolled extension movements.
- these extension movements were absorbed by rigid wheelchairs.
- the device described in the aforementioned European Patent Application allows the components of the wheelchair to follow the extension movements in a controlled manner by applying an elastic restoring force.
- the pivot axes of the components of this seat shell are situated at the physiologically optimum pivot points, i.e., the backrest is rotatably articulated to the seat in the area of the hip joint, and the footrest is rotatably articulated to the seat in the area of the knee joint.
- German Patent 199 30 103 C1 an additional seat shell for attachment to the chassis of a wheelchair is known from German Patent 199 30 103 C1.
- This seat shell has adopted the pivotable connection between the backrest and the footrest, which in this case is attached to the chassis of the wheelchair.
- thorax truss pads i.e., support pillows for the thorax, which are attached to the back seat so they are able to pivot transversely.
- These support elements are adjustable by muscle force and therefore provide the person sitting in the seat only limited support. In addition, they only secure the person sitting in the seat to the back support, but not to the seat shell.
- the object of the present invention is to provide a seat shell on which the position of the person sitting in the seat is fixed on the seat using easily adjustable and reliably fixable support elements.
- the support elements that are adjustable and fixable in the direction transverse to the seat permit lateral support of the buttocks and thighs of the person sitting in the seat, which is optimally adjusted to the size of the person sitting in the seat.
- a single wheelchair may be manufactured, which is optimally adjustable to the width of the person sitting in the seat.
- the accurate lateral support of the person sitting in the seat is required in particular in wheelchairs for patients suffering from spastic spasms. Such patients are subject to uncontrollable muscle contractions at irregular intervals which, as described previously, result in body extension.
- the narrow seat in the padded seat shell ensures that spasm-like movements are counteracted by soft contact elements and the person sitting in the seat does not hit a hard object with a body part.
- all the contact surfaces of the backrest and the seat, as well as the support elements on the side facing the body of the person sitting in the seat are provided with padding.
- the adjustable support elements according to the present invention ensure reliable lateral guidance, also known as adduction guidance or adduction truss pads.
- the wheelchair according to the present invention is particularly advantageous, because it is adjustable to the increasing size during the child's growth.
- the support elements are preferably pivotably attached to each longitudinal edge of the seat, which may result in a particularly simple adjustability.
- the pivotable attachment allows the support elements to be set obliquely to the vertical plane.
- the two opposite support elements may enclose trapezoidal spaces which enlarge downward. In this manner, the buttocks and the thighs of the person sitting in the seat are held by the support elements against being lifted from the seat.
- At least one bracket carrying the support element is articulated on each longitudinal edge of the seat. Two brackets are preferably used for securing each support element.
- each longitudinal edge of the seat has a longitudinal bore hole in which a threaded rod is situated, which has a head on its front end for positive engagement of a wrench and which exerts a clamping force on the bracket when tightened.
- This mode of attachment allows the pivoting position of the bracket to be secured in a particularly simple manner. It is only necessary to loosen the threaded rod using the wrench, readjust the pivoting position, and retighten the threaded rod.
- the screw head of the threaded rod is preferably situated on the front side of the seat shell.
- each longitudinal bore hole is situated within an extruded profile on the lateral edge of the seat.
- a reliable mount for the elements used for attaching the support elements to both sides of the seat shell may be provided.
- the aluminum extruded profiles may be connected to a metal plate forming the seat in any desired manner.
- a welded joint or a threaded joint is well suited for securing these profiles.
- the threaded rod preferably exerts a tensioning force on two parallel brackets which jointly hold a support element.
- the two brackets are capable of securing the support element on the seat with sufficient stability to counteract the muscle forces produced by spastic extension spasms.
- the two brackets may be attached parallel to one another to a common connecting sleeve.
- the connecting sleeve may also be mounted in the longitudinal bore hole on the longitudinal edge of the seat, the threaded rod extending within the connecting sleeve. This provides a compact and easy to service fastening device for the support element.
- the support element In order to achieve the aforementioned oblique position of the support element with respect to the vertical plane which is settable within a certain range, the support element should be pivotably mounted on the bracket.
- the two opposite support elements may then be positioned either vertically and parallel to one another or at an angle to one another.
- the support element has a metal sheet and a pad, a folded area of the metal sheet forming the receptacle for the pivot axis of the support element.
- the bracket should have a slit into which the folded area of the metal sheet is inserted, a draw spindle forming the pivot axis of the support element and generating a clamping force securing the brackets on the metal sheet passing through the bracket and the folded area of the metal sheet. This results in a fastening device similar to the one on the longitudinal edge of the seat on which the lower ends of the brackets are articulated.
- the screw head of the draw spindle should be situated on the front side of the seat shell and thus somewhat above the screw heads of the threaded rods. This makes it possible to initially set and fix the distance of a support element from the longitudinal center of the seat using the lower screw head of the threaded rod. Subsequently the inclination of the support element is settable using the upper head of the draw spindle.
- the draw spindles should pass through both brackets and folded areas of the metal sheet of the support element, simultaneously, which are clamped in slits by these brackets.
- FIG. 1 shows a side view of a seat shell according to the present invention on the chassis of a wheelchair
- FIG. 2 shows a side view of a part of an alternative connecting device connecting the backrest to the seat of the seat shell
- FIG. 3 shows a side view of the wheelchair of FIG. 1 with the backrest and seat in the pivoted position
- FIG. 4 shows a side view of a part of a wheelchair corresponding to the embodiment of FIG. 1, having an alternative connecting device;
- FIG. 5 shows a sectioned view of an extruded profile and a connecting element along section line V-V of FIG. 1;
- FIG. 6 shows a sectioned view of a double brace carrying the vertical frame of the chassis along section line VI-VI;
- FIG. 7 shows a partially sectioned side view of the double brace of FIG. 6
- FIG. 8 shows a front view of pivoting lateral support pillows attached to the seat
- FIG. 9 shows an enlarged view of a bracket for the support pillows of FIG. 8;
- FIG. 10 shows a side view of the support pillows of FIG. 8 with a sectioned fastening device
- FIG. 11 shows a sectioned view of the support surface along section line XI-XI of FIG. 10.
- the seat shell illustrated in FIG. 1 generally comprises a backrest 1 , a seat 2 , and a footrest 3 .
- Backrest 1 and seat 2 are shown in FIG. 1 without the textile protecting case in which they are usually encased.
- the contact surfaces for body parts Prior to use by a patient, the contact surfaces for body parts are provided with padding and encased with the protecting case. This ensures a soft contact of the person sitting in the seat shell with the surface of the seat shell.
- the padding and case are mostly omitted in the figures for the sake of clarity.
- Both backrest 1 and seat 2 have profiles 4 running on their two side edges. These are aluminum extruded profiles 4 , whose cross section is visible in particular in FIG. 5.
- FIG. 8 shows that a longitudinally running profile 4 is attached to each side of seat 2 .
- Backrest 1 also has a profile 4 on each of its sides.
- FIGS. 5 and 9 show that profiles 4 have an essentially square cross section.
- a groove 5 is located on each side of profile 4 .
- Each groove 5 has lateral undercuts 6 , so that either screw heads or displaceable sliding blocks may be inserted in groove 5 with a positive fit.
- Profile 4 has a longitudinal bore hole 7 in its center.
- FIG. 1 shows the preferred embodiment in which seat 2 and backrest 1 are pivotably linked to one another.
- a first base plate 12 is attached to the side of backrest 1 in longitudinal groove 5 on profile 4 using attachment screws 9 .
- Screw head 10 (see FIG. 5) of attachment screw 9 is inserted in groove 5 with a positive fit.
- a cap nut 11 is threaded onto the thread of attachment screw 9 .
- second base plate 8 is attached to profile 4 on the side of seat 2 .
- Base plates 8 and 12 are pivotably connected using a pivot bolt 13 .
- a similar connecting device is attached to profiles 4 of backrest 1 and seat 2 located there.
- the bottom of seat 2 is held on chassis 15 of a wheelchair displaceably in the longitudinal direction of seat shell 2 by a displaceable carriage 14 ; the chassis 15 has a large rear wheel 47 and a steerable front wheel 48 on either side.
- seat 2 is pivotably linked to carriage 14 .
- pivotable holding elements 16 are attached to the upper third of both side 10 profiles 4 of backrest 1 ; holding elements 16 link, pivotably about a pivot bolt 17 , backrest 1 to frame 18 of chassis 15 .
- FIG. 3 shows, in the event of an extending movement of a person seated in the seat shell, backrest 1 pivots backward with respect to seat 2 and moves about pivot bolt 17 of holding element 16 . Because backrest 1 is attached to vertical frame 18 of chassis 15 by holding element 16 , seat 2 must be pushed forward and pivot upward, which is made possible by carriage 14 , to which seat 2 is pivotably articulated.
- Pivot bolt 13 which permits backrest 1 to pivot with respect to seat 2 , is located exactly at the height of the hip joint thanks to base plates 8 , 12 which are preferably used. In the case of a growing person, the position of pivot bolt 13 may be readjusted continuously, because attachment screws 9 , which hold base plates 8 , 12 , are located in elongate holes 19 , 20 of base plates 8 , 12 , elongate holes 19 , 20 extending transversely with respect to grooves 5 in profiles 4 .
- footrest 3 which is supported by lateral base plates 21 , which are attached to both sides of seat 2 in longitudinal groove 5 .
- Lateral base plates 21 are connected to carrying elements 23 of footrest 3 via pivot bolt 22 .
- the position of pivot bolt 22 may be adjusted by displacing attachment screws 9 along groove 5 on the one hand and by displacing elongate holes 24 through which attachment screws 9 pass on the other hand.
- FIG. 4 shows an alternative embodiment of base plates 8 ′, 12 ′, and 21 ′, in which a plurality of individual bore holes are situated in bore hole rows 49 next to one another, instead of elongate holes.
- This embodiment also makes it possible to adjust the attachment of base plates 8 ′, 12 ′, and 21 ′ to profiles 4 transversely to their grooves 5 .
- Lateral support pillows 50 on backrest 1 are known as trunk pads, which support the upper body of the patient sitting in the wheelchair.
- FIGS. 1 and 3 schematically show tension springs 25 and 26 .
- Tension spring 25 draws carriage 14 backward, so that seat 2 is prestressed backward and backrest 1 is prestressed in the vertical, upright position. This prestressing force acts over the entire pivoting range between backrest 1 and seat 2 , as well as over the entire displacement path of seat 2 .
- Tension spring 26 draws footrest 3 into the angled position with respect to seat 2 , also over the entire pivoting range of footrest 3 .
- a single rigid base plate 27 may be attached to grooves 5 of profiles 4 on each side of seat 2 via attachment screws 9 (see FIG. 2).
- FIG. 1 shows that braces 28 for an adjustable holding device 29 for a head rest (not illustrated) is mounted on the upper section of longitudinal bore holes 7 of vertical profiles 4 on backrest 1 .
- One brace 28 is mounted on either side of backrest 1 in the profile mounted there.
- FIG. 6 and 7 first show the adjustability seen in FIG. 1 of chassis 15 of the wheelchair.
- Vertical frame 18 is adjustable in size in the longitudinal direction of seat 2 .
- vertical frame 18 has, on its lower ends, two double braces 31 which are each insertable in a double tube 30 of chassis 15 .
- Each brace of double brace 31 is hollow and, at its end, has a clamp body 32 resting on the oblique end of brace 31 via an oblique surface.
- Clamp bodies 32 may be drawn against the ends of double braces 31 using two draw spindles 33 , so that clamping occurs within double tube 30 , and vertical frame 18 is secured on chassis 15 .
- such double tubes 30 in which a double brace 31 of vertical frame 18 is mounted are located on both sides of seat 2 .
- FIGS. 8 through 11 show a novel fastening device for adjustable lateral support elements 34 .
- Each support element 34 has a folded metal sheet 35 , to which a pad 36 is attached.
- Each support element 34 is attached to a profile 4 on one side of seat 2 using two brackets 37 .
- a connecting sleeve 38 obliquely parted in the center, on whose two parts the two brackets 37 are non-rotatably attached, extends in each profile 4 within longitudinal bore hole 7 with little clearance.
- a threaded rod 40 whose threaded front end is screwed into a clamp body 39 , extends within connecting sleeve 38 .
- threaded rod 40 projecting outward carries a head screw 41 , which is positively engageable with a wrench.
- the screw head is located on the front edge of seat 2 near footrest 3 (see FIG. 1).
- Clamp body 39 is displaced in the axial direction toward connecting sleeve 38 by twisting threaded rod 40 . It is also displaced radially outward over the oblique surface of clamp body 39 .
- both connecting sleeves 38 are displaced radially with respect to one another over their oblique surfaces and are clamped within longitudinal bore hole 7 in profile 4 on seat 2 . After tightening threaded rod 40 , brackets 37 are fastened essentially rigidly to profile 4 .
- Support element 34 may be locked to the upper end of brackets 37 in a similar manner.
- a draw spindle 42 is located within distance sleeves 43 , 44 .
- the front end of draw spindle 42 has a screw head 45 .
- draw spindle 42 is tightened, folded areas 46 of metal sheet 35 are clamped into slits 53 within brackets 37 .
- Both screw head 45 of draw spindle 42 and screw head 41 of threaded rod 42 are located on the front end face of support element 34 and of profile 4 on seat 2 .
- Each support element 34 may thus be adjusted as desired both in its inclination and its position in the transverse direction of seat 2 .
- support elements 34 may be adjusted to different body widths in a broad adjustment range.
- Pads 36 of support elements 34 may also be set at an angle to one another, so that they enclose a trapezoidal space widening downward, for example.
- the support elements which are also known as adduction guides, not only exert a lateral support force in this position, but also a holding force on the hip and legs of the patient sitting in the wheelchair that prevents the patient from slipping out upward.
- Extruded profiles 4 are attached to backrest 1 and seat 2 in any suitable manner. They may be directly welded onto metal plates forming backrest 1 and seat 2 , for example. A detachable joint, however, is also possible.
- FIG. 9 shows, for example, a threaded joint in which a connecting screw 51 is screwed into an internal thread of a sliding block 52 , mounted in a longitudinal groove of profile 4 , through the metal plate forming seat 2 .
- Such threaded joints may be situated at different points along the length of profile 4 .
Abstract
The invention relates to a seat shell which is especially designed to be mounted on the chassis of a wheel chair or a stroller, and that comprises adjustable support elements (34) for supporting the person seated in said seat shell. The aim of the invention is to provide a seat shell with which the position of the seated person on the seat can be fixed by easily adjustable and reliably fixable support elements. To this end, the support elements (34) are disposed above the two lateral edges of the seat (2) and their distance to each other in the transverse direction of the seat (2) is adjustable.
Description
- The present invention relates to a seat shell which is provided for attachment to the chassis of a wheelchair or a stroller in particular, having a seat and a backrest, as well as adjustable support elements for supporting the person sitting in the seat shell.
- A plurality of seat shells, permanently or detachably connected to a chassis of a wheelchair are known from the related art. Some have height-adjustable armrests, for example, as adjustable support elements.
- Thus, for example, U.S. Pat. No. 4,039,223 describes a wheelchair in which the footrest and the backrest are fixable in different pivoting positions with respect to the seat.
- European Patent Application 911 008 A2 of the Applicant shows a seat shell in which the backrest and the footrest freely pivot with respect to the seat. Furthermore, the backrest is supported by a vertical section of the wheelchair frame. The seat is held pivotably on a slide guide, which allows the seat to move forward, as well as to pivot upwardly. A tensioning device draws the seat back to its surface into its flat position where it rests on the wheelchair frame, the backrest assuming the angled position with respect to the seat. An additional tensioning device prestresses the footrest over its entire pivoting range with respect to the seat so that it is also pivoted into the angled position. The movable seat device described in this Application forms an extremely innovative and advantageous device for seating disabled patients suffering from spastic extension spasms. In such patients spastic muscle spasms cause uncontrolled extension movements. Prior to the introduction of the object of the aforementioned European Patent Application, these extension movements were absorbed by rigid wheelchairs. The device described in the aforementioned European Patent Application allows the components of the wheelchair to follow the extension movements in a controlled manner by applying an elastic restoring force. The pivot axes of the components of this seat shell are situated at the physiologically optimum pivot points, i.e., the backrest is rotatably articulated to the seat in the area of the hip joint, and the footrest is rotatably articulated to the seat in the area of the knee joint.
- Finally, an additional seat shell for attachment to the chassis of a wheelchair is known from German Patent 199 30 103 C1. This seat shell has adopted the pivotable connection between the backrest and the footrest, which in this case is attached to the chassis of the wheelchair. In addition, it has thorax truss pads, i.e., support pillows for the thorax, which are attached to the back seat so they are able to pivot transversely. These support elements are adjustable by muscle force and therefore provide the person sitting in the seat only limited support. In addition, they only secure the person sitting in the seat to the back support, but not to the seat shell.
- The object of the present invention is to provide a seat shell on which the position of the person sitting in the seat is fixed on the seat using easily adjustable and reliably fixable support elements.
- This object is achieved according to the present invention by the fact that the support elements are situated above the two side edges of the seat and the distance between them in the transverse direction of the seat is adjustable.
- The support elements that are adjustable and fixable in the direction transverse to the seat permit lateral support of the buttocks and thighs of the person sitting in the seat, which is optimally adjusted to the size of the person sitting in the seat. Thus, a single wheelchair may be manufactured, which is optimally adjustable to the width of the person sitting in the seat.
- The accurate lateral support of the person sitting in the seat is required in particular in wheelchairs for patients suffering from spastic spasms. Such patients are subject to uncontrollable muscle contractions at irregular intervals which, as described previously, result in body extension. The narrow seat in the padded seat shell ensures that spasm-like movements are counteracted by soft contact elements and the person sitting in the seat does not hit a hard object with a body part. Of course, as in the wheelchairs known from the related art, all the contact surfaces of the backrest and the seat, as well as the support elements on the side facing the body of the person sitting in the seat are provided with padding.
- The adjustable support elements according to the present invention ensure reliable lateral guidance, also known as adduction guidance or adduction truss pads. In particular, for spastically disabled children, the wheelchair according to the present invention is particularly advantageous, because it is adjustable to the increasing size during the child's growth.
- The support elements are preferably pivotably attached to each longitudinal edge of the seat, which may result in a particularly simple adjustability. In particular, the pivotable attachment allows the support elements to be set obliquely to the vertical plane. Thus, the two opposite support elements may enclose trapezoidal spaces which enlarge downward. In this manner, the buttocks and the thighs of the person sitting in the seat are held by the support elements against being lifted from the seat.
- At least one bracket carrying the support element is articulated on each longitudinal edge of the seat. Two brackets are preferably used for securing each support element.
- In a particular embodiment of the seat shell according to the present invention, each longitudinal edge of the seat has a longitudinal bore hole in which a threaded rod is situated, which has a head on its front end for positive engagement of a wrench and which exerts a clamping force on the bracket when tightened. This mode of attachment allows the pivoting position of the bracket to be secured in a particularly simple manner. It is only necessary to loosen the threaded rod using the wrench, readjust the pivoting position, and retighten the threaded rod. The screw head of the threaded rod is preferably situated on the front side of the seat shell.
- In a particularly preferred embodiment of the seat shell, each longitudinal bore hole is situated within an extruded profile on the lateral edge of the seat. Using known aluminum extruded profiles having a central longitudinal bore hole, which are manufactured in large quantities for windows or for the construction of transportable racks, for example, a reliable mount for the elements used for attaching the support elements to both sides of the seat shell may be provided.
- The aluminum extruded profiles may be connected to a metal plate forming the seat in any desired manner. For example, a welded joint or a threaded joint is well suited for securing these profiles.
- The threaded rod preferably exerts a tensioning force on two parallel brackets which jointly hold a support element. The two brackets are capable of securing the support element on the seat with sufficient stability to counteract the muscle forces produced by spastic extension spasms. In addition, the two brackets may be attached parallel to one another to a common connecting sleeve. The connecting sleeve may also be mounted in the longitudinal bore hole on the longitudinal edge of the seat, the threaded rod extending within the connecting sleeve. This provides a compact and easy to service fastening device for the support element.
- In order to achieve the aforementioned oblique position of the support element with respect to the vertical plane which is settable within a certain range, the support element should be pivotably mounted on the bracket. The two opposite support elements may then be positioned either vertically and parallel to one another or at an angle to one another.
- An advantageously simple and stable construction of the support element results if it has a metal sheet and a pad, a folded area of the metal sheet forming the receptacle for the pivot axis of the support element. The bracket should have a slit into which the folded area of the metal sheet is inserted, a draw spindle forming the pivot axis of the support element and generating a clamping force securing the brackets on the metal sheet passing through the bracket and the folded area of the metal sheet. This results in a fastening device similar to the one on the longitudinal edge of the seat on which the lower ends of the brackets are articulated. The screw head of the draw spindle should be situated on the front side of the seat shell and thus somewhat above the screw heads of the threaded rods. This makes it possible to initially set and fix the distance of a support element from the longitudinal center of the seat using the lower screw head of the threaded rod. Subsequently the inclination of the support element is settable using the upper head of the draw spindle.
- If two brackets are used for attaching a support element, the draw spindles should pass through both brackets and folded areas of the metal sheet of the support element, simultaneously, which are clamped in slits by these brackets.
- The present invention is elucidated in the following with reference to the attached drawing on the basis of exemplary embodiments, which show a seat shell having a plurality of adjustment possibilities.
- FIG. 1 shows a side view of a seat shell according to the present invention on the chassis of a wheelchair;
- FIG. 2 shows a side view of a part of an alternative connecting device connecting the backrest to the seat of the seat shell;
- FIG. 3 shows a side view of the wheelchair of FIG. 1 with the backrest and seat in the pivoted position;
- FIG. 4 shows a side view of a part of a wheelchair corresponding to the embodiment of FIG. 1, having an alternative connecting device;
- FIG. 5 shows a sectioned view of an extruded profile and a connecting element along section line V-V of FIG. 1;
- FIG. 6 shows a sectioned view of a double brace carrying the vertical frame of the chassis along section line VI-VI;
- FIG. 7 shows a partially sectioned side view of the double brace of FIG. 6;
- FIG. 8 shows a front view of pivoting lateral support pillows attached to the seat;
- FIG. 9 shows an enlarged view of a bracket for the support pillows of FIG. 8;
- FIG. 10 shows a side view of the support pillows of FIG. 8 with a sectioned fastening device;
- FIG. 11 shows a sectioned view of the support surface along section line XI-XI of FIG. 10.
- The seat shell illustrated in FIG. 1 generally comprises a backrest1, a
seat 2, and afootrest 3. Backrest 1 andseat 2 are shown in FIG. 1 without the textile protecting case in which they are usually encased. Prior to use by a patient, the contact surfaces for body parts are provided with padding and encased with the protecting case. This ensures a soft contact of the person sitting in the seat shell with the surface of the seat shell. The padding and case are mostly omitted in the figures for the sake of clarity. - Both backrest1 and
seat 2 haveprofiles 4 running on their two side edges. These are aluminum extrudedprofiles 4, whose cross section is visible in particular in FIG. 5. FIG. 8 shows that alongitudinally running profile 4 is attached to each side ofseat 2. Backrest 1 also has aprofile 4 on each of its sides. - FIGS. 5 and 9 show that profiles4 have an essentially square cross section. A
groove 5 is located on each side ofprofile 4. Eachgroove 5 haslateral undercuts 6, so that either screw heads or displaceable sliding blocks may be inserted ingroove 5 with a positive fit.Profile 4 has alongitudinal bore hole 7 in its center. - FIG. 1 shows the preferred embodiment in which
seat 2 and backrest 1 are pivotably linked to one another. Afirst base plate 12 is attached to the side of backrest 1 inlongitudinal groove 5 onprofile 4 using attachment screws 9. Screw head 10 (see FIG. 5) ofattachment screw 9 is inserted ingroove 5 with a positive fit. Acap nut 11 is threaded onto the thread ofattachment screw 9. In the same way,second base plate 8 is attached toprofile 4 on the side ofseat 2. -
Base plates pivot bolt 13. On the other side of the seat arrangement, not shown in FIG. 1, a similar connecting device is attached toprofiles 4 of backrest 1 andseat 2 located there. - The bottom of
seat 2 is held onchassis 15 of a wheelchair displaceably in the longitudinal direction ofseat shell 2 by adisplaceable carriage 14; thechassis 15 has a largerear wheel 47 and a steerablefront wheel 48 on either side. In addition,seat 2 is pivotably linked tocarriage 14. Furthermore,pivotable holding elements 16 are attached to the upper third of bothside 10profiles 4 of backrest 1; holdingelements 16 link, pivotably about apivot bolt 17, backrest 1 to frame 18 ofchassis 15. - As FIG. 3 shows, in the event of an extending movement of a person seated in the seat shell, backrest1 pivots backward with respect to
seat 2 and moves aboutpivot bolt 17 of holdingelement 16. Because backrest 1 is attached tovertical frame 18 ofchassis 15 by holdingelement 16,seat 2 must be pushed forward and pivot upward, which is made possible bycarriage 14, to whichseat 2 is pivotably articulated. -
Pivot bolt 13, which permits backrest 1 to pivot with respect toseat 2, is located exactly at the height of the hip joint thanks tobase plates pivot bolt 13 may be readjusted continuously, because attachment screws 9, which holdbase plates elongate holes base plates elongate holes grooves 5 inprofiles 4. - The same applies to
footrest 3, which is supported bylateral base plates 21, which are attached to both sides ofseat 2 inlongitudinal groove 5.Lateral base plates 21 are connected to carryingelements 23 offootrest 3 viapivot bolt 22. Also in this case, the position ofpivot bolt 22 may be adjusted by displacingattachment screws 9 alonggroove 5 on the one hand and by displacingelongate holes 24 through which attachment screws 9 pass on the other hand. - FIG. 4 shows an alternative embodiment of
base plates 8′, 12′, and 21′, in which a plurality of individual bore holes are situated inbore hole rows 49 next to one another, instead of elongate holes. This embodiment also makes it possible to adjust the attachment ofbase plates 8′, 12′, and 21′ toprofiles 4 transversely to theirgrooves 5.Lateral support pillows 50 on backrest 1, visible in FIGS. 1 and 4, are known as trunk pads, which support the upper body of the patient sitting in the wheelchair. - FIGS. 1 and 3 schematically show tension springs25 and 26.
Tension spring 25 drawscarriage 14 backward, so thatseat 2 is prestressed backward and backrest 1 is prestressed in the vertical, upright position. This prestressing force acts over the entire pivoting range between backrest 1 andseat 2, as well as over the entire displacement path ofseat 2.Tension spring 26 drawsfootrest 3 into the angled position with respect toseat 2, also over the entire pivoting range offootrest 3. - Should the fastening device according to the present invention be designed to rigidly fastening a backrest1 to a
seat 2, a singlerigid base plate 27 may be attached togrooves 5 ofprofiles 4 on each side ofseat 2 via attachment screws 9 (see FIG. 2). - Fastening elements are also insertable into longitudinal bore holes7 of
profiles 4. For example, FIG. 1 shows that braces 28 for anadjustable holding device 29 for a head rest (not illustrated) is mounted on the upper section of longitudinal bore holes 7 ofvertical profiles 4 on backrest 1. Onebrace 28 is mounted on either side of backrest 1 in the profile mounted there. - An additional fastening element for an adjustable lateral supporting element mounted in the longitudinal bore hole of
profile 4 is described below in connection with FIGS. 8 through 11. - FIGS. 6 and 7 first show the adjustability seen in FIG. 1 of
chassis 15 of the wheelchair.Vertical frame 18 is adjustable in size in the longitudinal direction ofseat 2. For this reason,vertical frame 18 has, on its lower ends, twodouble braces 31 which are each insertable in adouble tube 30 ofchassis 15. Each brace ofdouble brace 31 is hollow and, at its end, has aclamp body 32 resting on the oblique end ofbrace 31 via an oblique surface.Clamp bodies 32 may be drawn against the ends ofdouble braces 31 using twodraw spindles 33, so that clamping occurs withindouble tube 30, andvertical frame 18 is secured onchassis 15. As mentioned previously, suchdouble tubes 30 in which adouble brace 31 ofvertical frame 18 is mounted are located on both sides ofseat 2. - FIGS. 8 through 11 show a novel fastening device for adjustable
lateral support elements 34. Eachsupport element 34 has a foldedmetal sheet 35, to which apad 36 is attached. Eachsupport element 34 is attached to aprofile 4 on one side ofseat 2 using twobrackets 37. As can be seen in FIG. 10 in particular, a connectingsleeve 38, obliquely parted in the center, on whose two parts the twobrackets 37 are non-rotatably attached, extends in eachprofile 4 withinlongitudinal bore hole 7 with little clearance. A threadedrod 40, whose threaded front end is screwed into aclamp body 39, extends within connectingsleeve 38. The end of threadedrod 40 projecting outward carries ahead screw 41, which is positively engageable with a wrench. The screw head is located on the front edge ofseat 2 near footrest 3 (see FIG. 1).Clamp body 39 is displaced in the axial direction toward connectingsleeve 38 by twisting threadedrod 40. It is also displaced radially outward over the oblique surface ofclamp body 39. Likewise, both connectingsleeves 38 are displaced radially with respect to one another over their oblique surfaces and are clamped withinlongitudinal bore hole 7 inprofile 4 onseat 2. After tightening threadedrod 40,brackets 37 are fastened essentially rigidly toprofile 4. -
Support element 34 may be locked to the upper end ofbrackets 37 in a similar manner. As shown in FIG. 11, adraw spindle 42 is located withindistance sleeves 43, 44. The front end ofdraw spindle 42 has ascrew head 45. Whendraw spindle 42 is tightened, foldedareas 46 ofmetal sheet 35 are clamped intoslits 53 withinbrackets 37. Bothscrew head 45 ofdraw spindle 42 and screwhead 41 of threadedrod 42 are located on the front end face ofsupport element 34 and ofprofile 4 onseat 2. Eachsupport element 34 may thus be adjusted as desired both in its inclination and its position in the transverse direction ofseat 2. - As FIG. 8 shows,
support elements 34 may be adjusted to different body widths in a broad adjustment range.Pads 36 ofsupport elements 34 may also be set at an angle to one another, so that they enclose a trapezoidal space widening downward, for example. The support elements, which are also known as adduction guides, not only exert a lateral support force in this position, but also a holding force on the hip and legs of the patient sitting in the wheelchair that prevents the patient from slipping out upward. - Extruded profiles4 are attached to backrest 1 and
seat 2 in any suitable manner. They may be directly welded onto metal plates forming backrest 1 andseat 2, for example. A detachable joint, however, is also possible. FIG. 9 shows, for example, a threaded joint in which a connectingscrew 51 is screwed into an internal thread of a slidingblock 52, mounted in a longitudinal groove ofprofile 4, through the metalplate forming seat 2. Such threaded joints may be situated at different points along the length ofprofile 4. -
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Claims (15)
1. A seat shell, which is provided for attachment to the chassis (15) of a wheelchair or a stroller in particular, having a seat (2) and a backrest (1), as well as adjustable support elements (34) for supporting the person sitting in the seat shell, characterized in that the support elements (34) are situated above the two side edges of the seat (2) and the distance between them in the transverse direction of the seat (2) is adjustable.
2. The seat shell as recited in claim 1 , characterized in that a support element (34) is pivotably attached to each longitudinal edge of the seat (2).
3. The seat shell as recited in claim 1 or 2, characterized in that at least one bracket (37) carrying the support element (34) is articulated on each longitudinal edge of the seat (2).
4. The seat shell as recited in claim 3 , characterized in that each longitudinal edge of the seat (2) has a longitudinal bore hole (7) in which a threaded rod (40) is situated, which has a head (41) on its front end for positive engagement of a wrench and which exerts a clamping force on the bracket (34) when tightened.
5. The seat shell as recited in claim 4 , characterized in that each longitudinal bore hole is situated within an extruded profile (4) on a lateral edge of the seat (2).
6. The seat shell as recited in claim 4 or 5, characterized in that the threaded rod (40) exerts a tension force on two parallel brackets (34).
7. The seat shell as recited in claim 6 , characterized in that the two brackets (34) are attached parallel to one another to a common connecting sleeve (38).
8. The seat shell as recited in claim 7 , characterized in that the connecting sleeve (38) is mounted in the longitudinal bore hole (7) on the longitudinal edge of the seat surface (2).
9. The seat shell as recited in claim 8 , characterized in that the threaded rod (40) is situated within the connecting sleeve (38).
10. The seat shell as recited in claims 3 through 9, characterized in that the support element (34) is pivotably mounted on the bracket (37).
11. The seat shell as recited in claim 10 , characterized in that the support element (34) has a metal sheet (35) and a pad (36), a folded area (46) of the metal sheet (36) forming the receptacle for the pivot axis of the support element (34).
12. The seat shell as recited in claim 11 , characterized in that the bracket (37) has a slit (53) into which the folded area of the metal sheet (46) is inserted.
13. The seat shell as recited in claim 12 , characterized in that a draw spindle (42) forming the pivot axis of the support element (34) and generating a clamping force securing the bracket (37) on the metal sheet (35) passes through the bracket (37) and the folded area (46) of the metal sheet (35).
14. The seat shell as recited in claim 13 , characterized in that the draw spindle (42) passes through two brackets (37) and folded areas (46) of the metal sheet (35) of the support element (34) simultaneously.
15. The seat shell as recited in claim 13 or 14, characterized in that the draw spindle (42) has a screw head (45) on its front end for positive engagement of a wrench.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10108311.4 | 2001-02-21 | ||
DE10108311A DE10108311A1 (en) | 2001-02-21 | 2001-02-21 | Seat shell with adjustable support elements |
PCT/EP2002/001744 WO2002065971A1 (en) | 2001-02-21 | 2002-02-19 | Seat shell with adjustable support elements |
Publications (1)
Publication Number | Publication Date |
---|---|
US20040084950A1 true US20040084950A1 (en) | 2004-05-06 |
Family
ID=7674969
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/468,534 Abandoned US20040084950A1 (en) | 2001-02-21 | 2002-02-19 | Seat shell with adjustable support elements |
Country Status (4)
Country | Link |
---|---|
US (1) | US20040084950A1 (en) |
EP (1) | EP1361844A1 (en) |
DE (1) | DE10108311A1 (en) |
WO (1) | WO2002065971A1 (en) |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMO20100064A1 (en) * | 2010-03-11 | 2011-09-12 | Barbieri S R L | FRAME FOR A WHEELCHAIR. |
TWI401070B (en) * | 2011-05-02 | 2013-07-11 | Univ Yuan Ze | Stewart platform seat mechanism and controlling method thereof for intelligent robotic wheelchair |
ITPI20120042A1 (en) * | 2012-04-12 | 2013-10-13 | Platinum Administration S A | DYNAMIC ASSISTANCE TO DISTONIE MOBILITY |
TWI415597B (en) * | 2011-03-23 | 2013-11-21 | Univ Yuan Ze | Intelligent robotic wheelchair |
WO2014166495A1 (en) * | 2013-04-10 | 2014-10-16 | R82 A/S | Seat |
US20150374565A1 (en) * | 2013-02-18 | 2015-12-31 | Roger Thomas Mascull And Elizabeth Jocelyn Mascull As Trustees Of The Rt & Ej Mascull Family Trust | Backrest angle adjustment system on a seat for a physically disabled person |
CN109224229A (en) * | 2018-09-12 | 2019-01-18 | 贵州省人民医院 | A kind of department of anesthesia's Inhalational anesthesia device |
US20200107978A1 (en) * | 2017-02-06 | 2020-04-09 | Megin Oy | Patient support device and method for adjusting the position of a patient |
US11083929B2 (en) * | 2017-06-02 | 2021-08-10 | ALLTrand, Inc. | Device for safely strengthening core muscles |
US11141626B2 (en) | 2017-06-02 | 2021-10-12 | ALLTrand, Inc. | Device for safely strengthening core muscles |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007046713A1 (en) * | 2007-09-28 | 2009-04-02 | Meybrand Gmbh | Seat shell for handicapped persons for attachment on rolling under frame, has seat element, arm rest and backrest, where arm rest and backrest are connected with seat element |
ITPD20130099A1 (en) * | 2013-04-17 | 2014-10-18 | Stefano Casotto | ADJUSTABLE SEAT |
EP3166556B1 (en) * | 2014-07-07 | 2018-11-14 | Casotto, Stefano | Adjustable seat |
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US3761126A (en) * | 1972-03-01 | 1973-09-25 | L Mulholland | Adjustable chair for children with cerebral palsy |
US4073537A (en) * | 1976-09-23 | 1978-02-14 | Hammersburg Don D | Universal support pads for wheelchair |
US5176706A (en) * | 1991-09-06 | 1993-01-05 | Lee Jong W | Spinal curvature correction device |
US6378947B1 (en) * | 1999-04-12 | 2002-04-30 | Bloorview Macmillan Centre | Seating system |
US6840577B2 (en) * | 2002-06-27 | 2005-01-11 | Convaid Products, Inc. | Adjustable folding planar seat |
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GB1301595A (en) * | 1970-10-09 | 1972-12-29 | ||
SE391873B (en) | 1974-10-15 | 1977-03-07 | Landstingens Inkopscentral | CHAIR WITH ONE IN ANY DIFFERENT ANGLE LASBAR BACK |
FR2556587B1 (en) * | 1983-12-20 | 1986-12-26 | Mathis Michel | SEAT FOR THE DISABLED |
NL9001040A (en) * | 1990-05-01 | 1991-12-02 | Linido Bv | DISABLED CHAIR. |
DE29718696U1 (en) | 1997-10-21 | 1998-02-26 | Interco Ges Fuer Die Planung U | Movable seating arrangement |
DE19930103C1 (en) | 1999-07-01 | 2001-02-15 | Reha Technik Moeller Gmbh | Dynamic orthopaedic seat shell for wheelchair user has chest restraints pivoted relative to backrest via pivot levers with tension bands limiting their movement |
WO2001035892A2 (en) * | 1999-11-15 | 2001-05-25 | Freedom Designs Incorporated | Improved wheelchair with tilting seat |
-
2001
- 2001-02-21 DE DE10108311A patent/DE10108311A1/en not_active Withdrawn
-
2002
- 2002-02-19 EP EP02716789A patent/EP1361844A1/en not_active Withdrawn
- 2002-02-19 WO PCT/EP2002/001744 patent/WO2002065971A1/en not_active Application Discontinuation
- 2002-02-19 US US10/468,534 patent/US20040084950A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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US3761126A (en) * | 1972-03-01 | 1973-09-25 | L Mulholland | Adjustable chair for children with cerebral palsy |
US4073537A (en) * | 1976-09-23 | 1978-02-14 | Hammersburg Don D | Universal support pads for wheelchair |
US5176706A (en) * | 1991-09-06 | 1993-01-05 | Lee Jong W | Spinal curvature correction device |
US6378947B1 (en) * | 1999-04-12 | 2002-04-30 | Bloorview Macmillan Centre | Seating system |
US6840577B2 (en) * | 2002-06-27 | 2005-01-11 | Convaid Products, Inc. | Adjustable folding planar seat |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITMO20100064A1 (en) * | 2010-03-11 | 2011-09-12 | Barbieri S R L | FRAME FOR A WHEELCHAIR. |
TWI415597B (en) * | 2011-03-23 | 2013-11-21 | Univ Yuan Ze | Intelligent robotic wheelchair |
TWI401070B (en) * | 2011-05-02 | 2013-07-11 | Univ Yuan Ze | Stewart platform seat mechanism and controlling method thereof for intelligent robotic wheelchair |
EP2836184A4 (en) * | 2012-04-12 | 2015-10-07 | Alu Rehab As | Wheelchair dynamic seating system suitable for dystonic disease |
WO2013153446A1 (en) * | 2012-04-12 | 2013-10-17 | Alu Rehab As | Wheelchair dynamic seating system suitable for dystonic disease |
ITPI20120042A1 (en) * | 2012-04-12 | 2013-10-13 | Platinum Administration S A | DYNAMIC ASSISTANCE TO DISTONIE MOBILITY |
US20150374565A1 (en) * | 2013-02-18 | 2015-12-31 | Roger Thomas Mascull And Elizabeth Jocelyn Mascull As Trustees Of The Rt & Ej Mascull Family Trust | Backrest angle adjustment system on a seat for a physically disabled person |
US9707139B2 (en) * | 2013-02-18 | 2017-07-18 | Roger Thomas Mascull and Elizabeth Jocelyn Mascull | Backrest angle adjustment system on a seat for a physically disabled person |
WO2014166495A1 (en) * | 2013-04-10 | 2014-10-16 | R82 A/S | Seat |
US9827154B2 (en) | 2013-04-10 | 2017-11-28 | R82 A/S | Seat |
US20200107978A1 (en) * | 2017-02-06 | 2020-04-09 | Megin Oy | Patient support device and method for adjusting the position of a patient |
US11083929B2 (en) * | 2017-06-02 | 2021-08-10 | ALLTrand, Inc. | Device for safely strengthening core muscles |
US11141626B2 (en) | 2017-06-02 | 2021-10-12 | ALLTrand, Inc. | Device for safely strengthening core muscles |
CN109224229A (en) * | 2018-09-12 | 2019-01-18 | 贵州省人民医院 | A kind of department of anesthesia's Inhalational anesthesia device |
Also Published As
Publication number | Publication date |
---|---|
EP1361844A1 (en) | 2003-11-19 |
DE10108311A1 (en) | 2002-08-29 |
WO2002065971A1 (en) | 2002-08-29 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: INTERCO GESELLSCHAFT FUR DIE PLANUNG UND DEN VERTR Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MARKWALD, MICHAEL;REEL/FRAME:014794/0489 Effective date: 20031021 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |