WO1992009463A1 - Mecanisme de blocage de roues pour fauteuil roulant - Google Patents

Mecanisme de blocage de roues pour fauteuil roulant Download PDF

Info

Publication number
WO1992009463A1
WO1992009463A1 PCT/US1991/008989 US9108989W WO9209463A1 WO 1992009463 A1 WO1992009463 A1 WO 1992009463A1 US 9108989 W US9108989 W US 9108989W WO 9209463 A1 WO9209463 A1 WO 9209463A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact arm
wheel
wheelchair
pivot
function plate
Prior art date
Application number
PCT/US1991/008989
Other languages
English (en)
Inventor
Son H. Le
James B. Papac
Original Assignee
Fortress Lite-Style, Inc.
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US07/618,726 external-priority patent/US5174418A/en
Application filed by Fortress Lite-Style, Inc. filed Critical Fortress Lite-Style, Inc.
Publication of WO1992009463A1 publication Critical patent/WO1992009463A1/fr

Links

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
    • A61G5/00—Chairs or personal conveyances specially adapted for patients or disabled persons, e.g. wheelchairs
    • A61G5/10—Parts, details or accessories
    • A61G5/1005—Wheelchairs having brakes
    • A61G5/1013—Wheelchairs having brakes engaging the wheel
    • A61G5/1018—Wheelchairs having brakes engaging the wheel on the running surface
    • 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
    • A61G5/1005—Wheelchairs having brakes
    • A61G5/101—Wheelchairs having brakes of the parking brake type, e.g. holding the wheelchair
    • 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
    • A61G5/1005—Wheelchairs having brakes
    • A61G5/1035—Wheelchairs having brakes manipulated by wheelchair user
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/04—Braking mechanisms; Locking devices against movement
    • B62B5/0457—Braking mechanisms; Locking devices against movement by locking in a braking position
    • B62B5/0461—Braking mechanisms; Locking devices against movement by locking in a braking position with positive engagement

Definitions

  • This invention relates generally to wheel lock systems for use with wheelchairs and, more particularly, to lock systems that can lock a wheel of a wheelchair by motion of an operating lever in either one of two selectable directions.
  • Wheelchairs typically include wheel lock systems that can be used to lock one of the wheels of the wheelchair to hold the wheelchair in a fixed position.
  • a wheelchair wheel lock system should have an operating lever with positive engagement and good force multiplication.
  • Most wheelchair wheel lock systems incorporate a mechanical linkage that effectively multiplies the force applied through the operating lever to provide secure wheel locking with a precise, positive operating feel, but many require physical abilities that some wheelchair occupants do net possess.
  • wheelchair occupants Due to particular arm strengths or disabilities, wheelchair occupants sometimes find they can only exert either a pushing motion or a pulling motion to engage the wheel lock system. Such occupants might also have a limited range of movement that allows them to move cne operating lever over a restri.C-.eu range in either direction.
  • Conventional wheelchair wheel lock systems often are designed for locking engagement in only one of the two directions of handle notion and cannot change the range of motion necessary for wheel locking.
  • a wheelchair wheel lock system might be designed to be engaged by a pushing notion on the operating lever, while a wheelchair occupant might be limited to arm movement with strength in a pulling motion.
  • Wheelchair wheel lock systems have been proposed that allow either a pushing or pulling motion to engage the brake.
  • Such dual-action systems provide increased flexibility and do not require increased inventory, - but can be rather complicated and expensive to manufacture. If the cost of manufacturing the wheelchair wheel lock system is too high, it can be just as cost effective for the manufacturer to provide an inventory of wheelchairs with single-action lock systems separately capable of pushing motions and pulling motions.
  • some wheel lock systems that provide the option of push-to-lock or pull-to-lock action may not provide a positive feel due to the complicated linkage, or can be somewhat difficult to switch between the two.
  • One double action system is shown in U. S . Patent No. 4 ,749, 064 to Jinno et al. Examples of typical single direction locking mechanisms are shown by U. S. Patent No. 4 , 887 , 830 to Fought et al . and U.S. Patent No. 4 , 570, 756 to Minnebraker et al.
  • the present invention is embodied in a 5 wheelchair wheel lock system having a relatively simple and direct mechanism in which the lock engagement motion can be selected between either a pulling motion or a pushing motion of the system's operating lever, and can be changed between the two by simply changing the pivot axis
  • Rotation of the operating lever causes rotation of the function plate and thereby moves a contact arm into engagement with a wheel of the wheelchair to lock the wheel against movement.
  • the operating angle of the lever can be varied to accommodate a wheelchair
  • the lever can include a telescoping portion that provides added leverage.
  • the lever can be constructed with a cylindrical cross-section for easier and more comfortable actuation. Because the wheel lock system can be easily changed between push-to-
  • the wheel lock system in accordance with the present invention provides a simple, relatively direct linkage between the operating lever and the contact arm and produces a precise, positive feel during operation
  • - - wheelchair wheel lock system includes a function plate that is pivotably -ounted in one of two configurations to produce either a push-to-lock or pull-to-lock operation.
  • the wheel lock system in accordance with the present invention provides whichever arrangement best suits a particular wheelchair occupant, while providing a highly reliable, low maintenance mechanism.
  • the wheel lock system includes a cylindrical telescoping operating lever, a contact arm, a linkage bar, and a function plate that is rotatable under control of the lever to drive the linkage bar and force the contact arm into an engaged or disengaged position.
  • the function plate is pivotably mounted to rotate about one of two different pivot holes and provide either a push-to-lock or pull-to-lock operation.
  • the system can include a coiled return spring to provide a return torque to the wheel lock mechanism.
  • the wheelchair wheel lock system in accordance with the present invention provides the flexibility of either pull-to-lock or push-to-lock operation, a relatively simple mechanism with fewer parts for easier production and a more solid feel, and a reduced inventory requirement for wheel lock systems with push operation and pull operation.
  • FIG. 1 is a side view of a wheelchair having mounted thereon a reversible lever motion wheel lock system in accordance with the present invention
  • FIG. 2 is an exploded perspective diagram, partly broken away, of the wheel lock system shown in FIG. 1;
  • FIG. 3 is a side view of the wheel lock system illustrated in FIG. 2 in the push-to-lock configuration.
  • FIG. 4 is a side view of the wheel lock system illustrated in FIG. 2 in the pull-to-lock configuration
  • FIG. 5A is a side view of the wheel lock system illustrated in FIG. 4 showing the adjustable lever in the unlocked position
  • FIG. 5B is a side view of the wheel lock system illustrated in FIG. 4 showing the adjustable lever in the locked position.
  • a wheelchair 10 shown in FIG. 1 includes a wheel lock system 12 in accordance with the invention.
  • the wheelchair includes a frame 20 to which is attached a pair cf large diameter rear wheels such as the one wheel 16 shown in side view, and also a pair of smaller diameter front w.-.eels 22.
  • the front wheels are attached to the frame by
  • SUBSTITUTESHEET a caster arrangement 24 to provide steering direction for the wheelchair.
  • the wheel lock system 12 can be installed on the frame 20 such that the operating lever 18 can be activated by either pushing away from the wheelchair occupant or pulling toward the wheelchair occupant, and therefore can accommodate wheelchair occupants with limited movement. This reduces the inventory requirements of manufacturers for providing such accommodation.
  • a mounting bracket 30 is mounted to the wheelchair frame 20 by a first clamping shell 32 and a second clamping shell 34 that each include curved portions 36 and 38, respectively, which clamp around the wheelchair frame.
  • the first and second clamping shells are held together, and the bracket 30 is attached to them, by a clamping bolt 40 secured by a washer 42 and clamping nut 44.
  • the contact arm 14 pivots with respect to the mounting bracket 30 into and out of engagement with the large diameter rear wheel 16, which is shown in FIG. 1.
  • the contact arm includes a pivot hole 46 and a linkage hole 48, and pivots about the pivot hole by a pivot bolt 50 that passes through the hole and the bracket 30 and is secured by a nut 52.
  • a coiled spring 54 fits around the pivot bolt and is attached to an intermediate washer 56 and the attachment nut 52 so as to provide a return action for the c. ⁇ t ⁇ ct arm 14.
  • the return action ma et, it easier and more convenient to use the wheel lock syste- an d assures that the contact arm 14 does not unintentionally engage the wheel 16.
  • the coiled spring 54 terminates at one end in an axially extending portion 54A that matingiy engages a
  • the spring 54 terminates at its opposite end in an axially-extending portion 54C that passes through a bore 56 in a washer 57 to matingly engage a hole 59 in the contact arm 14. The spring 54 may thus rotationally bias the contact arm 14 relative to the wheel 16.
  • the wheel lock system 12 can be adapted to either a push-to-lock or pull-to-lock operation by means of a function plate 58.
  • the function plate includes an upper pivot hole 66 and a lower pivot hole 68 that alternatively define a pivot axis of the function plate and determine whether the wheel lock system has a pull- to-lock or a push-to-lock action.
  • the function plate is coupled to the operating lever 18 by means of a multi- sided receiving hole 60 that receives one end of the lever, and is connected to the contact arm 14 by a linkage bar or plate 62 through a linkage connect hole 64 in the function plate 58.
  • the function plate 58 rotates about a function plate pivot bolt 70 that is passed through either the upper or lower function plate pivot hole 66 or 68, respectively, and through the mounting plate 30, to be secured thereto by a pivot nut 72.
  • Intermediate washers 74 and 76 provide smooth pivoting action.
  • Rotation of the operating lever 18 rotates the function plate 58, driving the linkage plate 62 to rotate the contact arm 14 into locking engagement with the wheel 16 as the contact arm engages the wheel.
  • FIG. 3 illustrates that, in the push-to-lock configuration, the function plate 58 is attached to the mounting plate 30 at the upper pivot hole 66 by the pivot bolt 70, while the lower pivot hole 68 is not used.
  • the linkage plate 62 is
  • SUBSTITUTESHEET attached to the contact arm 14 by a contact arm bolt 78 that is secured by a nut 80 and rotates freely with the aid of intermediate washers 82.
  • the linkage plate 62 is attached to the function plate 58 by a function plate screw 84 and a function plate nut 86, with free movement provided by intermediate washers 88.
  • the function plate 58 rotates clockwise about the upper pivot hole 66 until the centers of the pivot hole 66, linkage connect hole 64, and the contact arm linkage hole 48 become substantially linearly aligned. At this point the contact arm 14 has a maximum rotation.
  • the operating lever 18 and function plate 58 may then continue to rotate a short distance as the wheel lock system 12 "snaps through center” a short distance until a left edge 120 of the function plate 58 engages a stop edge 122 of the contact arm 14 in a stable position.
  • FIG. 4 shows that the function plate 58 pivots counter-clockwise about the lower holt! ⁇ with respect to the mounting pi ⁇ .0 oy means of the pivot bolt 70, while the upper pivot hole 66 is not used.
  • the wheel lock system 12 must be repositio ⁇ ed slightly on the frame 20 because the throw of the contact arm 14 changes when the function plate pivot is changed. The extent of repositioning necessary is well within the abilities of one skilled in the art. In all
  • the wheel lock system 12 of FIG. 4 is just as shown in FIG. 3. That is, the contact arm 14 is coupled to the function plate 58 by a linkage plate 62 and pivots about axes defined by the function plate nut 86 and the contact arm bolt 78.
  • FIG. 5B shows the pull-to-lock configuration of FIG. 4 after counter-clockwise rotation to the locked position of FIG. 5B.
  • the contact arm 14 In the unlocked position (FIGS. 4, 5A) , the contact arm 14 is positioned away from the large diameter rear wheel 16.
  • the operating lever 18 In the locked position shown in FIG. 5B, the operating lever 18 has been pulled upward, pivoting the function plate 58 about the bolt 70, which operates through the linkage plate 62 to move the contact arm 14 into locking engagement with the rear wheel 16. A firm engagement with the rear wheel can then be obtained, locking the wheel in position.
  • FIG. 5B illustrates the wheel lock system 12 after rotation through the maximum force alignment point wherein the holes 68, 64 and 48 are linearly aligned.
  • the left edge 120 of the function plate 58 engages the stop edge 122 of the contact arm 14 and additional force is required to rotate the function plate 58 counter-clockwise toward the unlock position of FIG. 4.
  • the wheel lock system 12 thus provides a center-stable locking position.
  • a wheelchair wheel lock system in accordance with the present invention includes an adjustable operating lever 18 whose range of operational movement in either configuration can be changed to substantially suit the particular range desire d
  • the lever arm hole 60 in the function plate 58 is keyed to the operating lever 18 by virtue of having a polygonal opening that mates with a matching polygonal pattern on the end of the lever to be inserted into the hole 60.
  • the polygonal shaped key is a hexagon.
  • the lever is fixed relative to the function plate by an attachment screw 90 and a lock washer 92.
  • the operating lever 18 can be removed from the function 58 plate and then rotated relative to the function plate so as to place the lever in a different angular orientation relative to the function plate regardless of whether the wheel lock system is in the pull-to-lock or push-to-lock configuration.
  • FIGS. 5A and 5B show that in either the unlocked position of FIG. 5A or the locked position of FIG. 5B, the lever 18 can be moved from a first orientation shown in solid lines to a second orientation shown in dashed lines without moving the contact arm 14.
  • This change in angular orientation is achieved by removing the attachment screw 92, pulling the lever 18 out of the attachment hole 60, rotating the lever arm so that it fits back into the hole in a different angular orientation, and then attaching the arm to the function plate 58 by the screw 92.
  • the hexagonal configuration of the operating lever 18 and the recexv_ng hole 60 allow the operating lever ⁇ _o be easily mounted in any one of six positions relative to the function plate 58 and therefore allow flexibility in mounting the lever in the position most convenient for t h e wheelchair occupant.
  • FIG. 2 shows that the operating lever 18 can be provided with a multi-segmented telescoping extension portion 96 that provides an extensible length to the lever. If the wheelchair occupant should require or desire greater leverage, the lever can be extended and force can be applied from the rubberized lever tip 98. Whether or not the operating lever is provided with a telescoping portion, the lever is advantageously provided with a circular cross-section. This makes the lever easier and more comfortable to grasp and to apply torque against.
  • a radially inner portion 95 of the operating lever 18 has a circumferential groove 95A that receives and supports a c-shaped retainer ring 100.
  • the ring is a resilient metal spring that rests loosely within the groove 95A with its outer circumference extending outside the groove 95A.
  • the radially outer extension portion 96 has an internal axially extending bore 96A that allows the extension portion to be pushed over the inner portion 95, and with the bore 96A receiving the portion 95, the ring 100 is resiliently compressed until it reaches a groove 102 in the inside surface of the bore 96A.
  • the groove 102 has an orthogonal edge 104 that prevents the outer portion 96 from being extended past the ring 100 once the ring has entered the groove 102.
  • the groove 102 also has a tapered edge 106 which provides a detent action as the outer portion 96 is forced onto the inner portion 95 with the ring 100 passing out of the groove 102 and into ti.e bo_.e 96A.
  • the frictional engagement between the ring 100 and the bore 96A creates a drag that tends to resist relative motion between the outer portion 96 and the inner portion 55.
  • a wheelchair wheel lock system has been described that can be placed in either a pull-to-lock or push-to-lock configuration, using a simple mechanism that provides a solid feel and precise engagement.
  • the need for maintaining an inventory of wheelchairs with both pull-to-lock and push-to-lock wheel lock systems becomes unnecessary, and the simple mechanism provides greater reliability, increased durability, and a more precise operating field.
  • the center of the linkage connect hole 64 in the function plate 58 is positioned 0.350 inch above the lower edge 110 and 0.700 inch to the left of the center of the lower pivot hole 68.
  • the center of the lower pivot hole 68 is positioned 0.350 inch above the lower edge 110, in line with the linkage connect hole 64 and 0.400 inch to the left of the right edge 112.
  • the center of the upper pivot hole 66 is positioned 0.300 inch to the left of the right edge 112 and 0.675 inch duove the center of the lower pivot noie 68.
  • the center of the handle receiving hole 60 should be about equally spaced from the upper and lower pivot holes 66 and 68, and is positioned 0.925 inch above the lower edge 110 and 1.075 inches left of the right edge 112.
  • the mounting bracket 30 has a function plate pivot hole 114 near the right hand side thereof and a brake arm pivot hole 116 near the left hand end. These two pivot holes are spaced apart center-to-center 1.560 inch, with a central attachment hole 115 located 1.160 inch to the left of the mounting bracket's right edge.
  • the holes in the linkage plate 62 have a center-to-center spacing of 0.900 inch and the pivot hole 46 and linkage connection hole 48 of the contact arm 14 have a center- to-center spacing of 0.981 inch. It is to be understood that the dimensions above relate to the illustrated embodiment only. Those skilled in the art will appreciate that it is possible to depart somewhat from these dimensions, while generally maintaining the relative proportions, and still obtain the benefits of the invention.

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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)
  • Handcart (AREA)

Abstract

Un système de blocage des roues d'un fauteuil roulant peut être adapté pour foctionner sous l'effet soit d'une poussée soit d'une traction. Le système de blocage des roues comprend une plaque de fonctionnement (58) dotée de premier (66) et second (68) trous de points de pivot. Un levier de commande (18) est fixé à la plaque de fonctionnement (58), la rotation dudit levier (18) fait tourner ladite plaque de fonctionnement (58) amenant ainsi un bras de contact (14) contre la roue du fauteuil roulant afin de bloquer la roue en l'empêchant de tourner. On peut commuter le fonctionnement du système de blocage de la roue entre un blocage par poussée et un blocage par traction en adaptant ladite plaque de fonctionnement (58) de manière qu'elle tourne soit autour du premier trou de pivot (66) soit autour du second trou de pivot (68). Le levier de commande (18) peut être fixé à ladite plaque de fonctionnement (58)dans diverses orientations, ce qui améliore la souplesse de fonctionnement du système de blocage des roues.
PCT/US1991/008989 1990-11-27 1991-11-27 Mecanisme de blocage de roues pour fauteuil roulant WO1992009463A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US07/618,726 US5174418A (en) 1990-11-27 1990-11-27 Wheel lock mechanism for a wheelchair
US618,726 1990-11-27
CA002035744A CA2035744A1 (fr) 1990-11-27 1991-02-05 Mecanisme de verrouillage des roues de fauteuil roulant
CA2,035,744 1991-02-05

Publications (1)

Publication Number Publication Date
WO1992009463A1 true WO1992009463A1 (fr) 1992-06-11

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PCT/US1991/008989 WO1992009463A1 (fr) 1990-11-27 1991-11-27 Mecanisme de blocage de roues pour fauteuil roulant

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WO (1) WO1992009463A1 (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998040253A1 (fr) * 1997-03-13 1998-09-17 Ilon B E Dispositif de defreinage, de preference de roulettes pivotantes
US7083195B2 (en) 2002-10-25 2006-08-01 Invacare Corporation Suspension with releasable locking system
US8910975B2 (en) 2007-02-14 2014-12-16 Invacare Corporation Wheelchair with suspension
US8925943B2 (en) 2001-10-10 2015-01-06 Invacare Corp. Wheelchair suspension
US9010470B2 (en) 2009-10-09 2015-04-21 Invacare Corporation Wheelchair suspension
US9149398B2 (en) 2000-10-27 2015-10-06 Invacare Corporation Obstacle traversing wheelchair
US9308143B2 (en) 2012-02-15 2016-04-12 Invacare Corporation Wheelchair suspension
US9364377B2 (en) 2002-10-25 2016-06-14 Invacare Corporation Suspension for wheeled vehicles
US9603762B2 (en) 2007-02-08 2017-03-28 Invacare Corporation Wheelchair suspension
US11213441B2 (en) 2002-10-25 2022-01-04 Invacare Corporation Suspension for wheeled vehicles
US11903887B2 (en) 2020-02-25 2024-02-20 Invacare Corporation Wheelchair and suspension systems

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US4560049A (en) * 1982-09-28 1985-12-24 Honda Giken Kogyo Kabushiki Kaisha Operation device for clutch master cylinder with means to adjust the play stroke of the clutch lever
US4570756A (en) * 1983-09-30 1986-02-18 Quadra Wheelchairs, Inc. Brake device for wheelchairs
US4749064A (en) * 1985-09-28 1988-06-07 Nissin Medical Industries Co., Ltd. Brake system for a wheelchair
US4838387A (en) * 1987-05-29 1989-06-13 Yoshigai Kikai Kinzoku Co., Ltd. Center-pull caliper brake
US4887830A (en) * 1988-03-29 1989-12-19 Invacare Corporation Wheelchair with combined wheel lock and hill holder
US4989890A (en) * 1986-09-30 1991-02-05 Invacare Corporation Length and width adjustable wheelchair

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4560049A (en) * 1982-09-28 1985-12-24 Honda Giken Kogyo Kabushiki Kaisha Operation device for clutch master cylinder with means to adjust the play stroke of the clutch lever
US4570756A (en) * 1983-09-30 1986-02-18 Quadra Wheelchairs, Inc. Brake device for wheelchairs
US4749064A (en) * 1985-09-28 1988-06-07 Nissin Medical Industries Co., Ltd. Brake system for a wheelchair
US4989890A (en) * 1986-09-30 1991-02-05 Invacare Corporation Length and width adjustable wheelchair
US4838387A (en) * 1987-05-29 1989-06-13 Yoshigai Kikai Kinzoku Co., Ltd. Center-pull caliper brake
US4887830A (en) * 1988-03-29 1989-12-19 Invacare Corporation Wheelchair with combined wheel lock and hill holder

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998040253A1 (fr) * 1997-03-13 1998-09-17 Ilon B E Dispositif de defreinage, de preference de roulettes pivotantes
US9149398B2 (en) 2000-10-27 2015-10-06 Invacare Corporation Obstacle traversing wheelchair
US9987177B2 (en) 2000-10-27 2018-06-05 Invacare Corporation Obstacle traversing wheelchair
US9370455B2 (en) 2001-10-10 2016-06-21 Invacare Corporation Wheelchair suspension
US8925943B2 (en) 2001-10-10 2015-01-06 Invacare Corp. Wheelchair suspension
US11213441B2 (en) 2002-10-25 2022-01-04 Invacare Corporation Suspension for wheeled vehicles
US9364377B2 (en) 2002-10-25 2016-06-14 Invacare Corporation Suspension for wheeled vehicles
US7083195B2 (en) 2002-10-25 2006-08-01 Invacare Corporation Suspension with releasable locking system
US10512572B2 (en) 2002-10-25 2019-12-24 Invacare Corporation Suspension for wheeled vehicles
US9925100B2 (en) 2002-10-25 2018-03-27 Invacare Corporation Suspension for wheeled vehicles
US11464687B2 (en) 2007-02-08 2022-10-11 Invacare Coporation Wheelchair suspension
US11819464B2 (en) 2007-02-08 2023-11-21 Invacare Corporation Wheelchair suspension
US9603762B2 (en) 2007-02-08 2017-03-28 Invacare Corporation Wheelchair suspension
US10912690B2 (en) 2007-02-08 2021-02-09 Invacare Corporation Wheelchair suspension
US10265229B2 (en) 2007-02-08 2019-04-23 Invacare Corporation Wheelchair suspension
US9346335B2 (en) 2007-02-14 2016-05-24 Invacare Corporation Stability control system
US11535078B2 (en) 2007-02-14 2022-12-27 Invacare Corporation Stability control system
US11850906B2 (en) 2007-02-14 2023-12-26 Invacare Corporation Stability control system
US9827823B2 (en) 2007-02-14 2017-11-28 Invacare Corporation Stability control system
US10532626B2 (en) 2007-02-14 2020-01-14 Invacare Corporation Stability control system
US8910975B2 (en) 2007-02-14 2014-12-16 Invacare Corporation Wheelchair with suspension
US11097589B2 (en) 2007-02-14 2021-08-24 Invacare Corporation Stability control system
US11096845B2 (en) 2009-10-09 2021-08-24 Invacare Corporation Wheelchair suspension
US9010470B2 (en) 2009-10-09 2015-04-21 Invacare Corporation Wheelchair suspension
US9913768B2 (en) 2009-10-09 2018-03-13 Invacare Corporation Wheelchair suspension
US11857470B2 (en) 2009-10-09 2024-01-02 Invacare Corporation Wheelchair suspension
US9308143B2 (en) 2012-02-15 2016-04-12 Invacare Corporation Wheelchair suspension
US11234875B2 (en) 2012-02-15 2022-02-01 Invacare Corporation Wheelchair suspension
US9700470B2 (en) 2012-02-15 2017-07-11 Invacare Corporation Wheelchair suspension
US10434019B2 (en) 2012-02-15 2019-10-08 Invacare Corporation Wheelchair suspension
US11903887B2 (en) 2020-02-25 2024-02-20 Invacare Corporation Wheelchair and suspension systems

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