# US 9,867,747 B2 · Stabilized raising wheelchair > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,867,747 B2 - Document ID: US9867747B2 - Status: Granted - Kind: B2 - Application number: 15/168,668 - Filed: 2016-05-31 - Published: 2016-09-22 - Granted: 2018-01-16 - Earliest claimed: 2011-09-20 - Assignees: Dane Technologies, Inc. - Applicants: Dane Technologies, Inc. - Inventors: Balz Maurer; Fabian Wolter - Web page: https://patentgrep.com/patent/US9867747B2 ## CPC - A61G 5/14: Standing-up or sitting-down aids - A61G 5/08: foldable - A61G 5/1054: {Large wheels, e.g. higher than the seat portion} - A61G 5/1067: {adjusting the backrest relative to the seat portion} - A61G 5/1081: {with shock absorbers or other suspension arrangements between frame and seat} - A61G: TRANSPORT, PERSONAL CONVEYANCES OR ACCOMMODATION SPECIALLY ADAPTED FOR PATIENTS OR DISABLED PERSONS (appliances for aiding patients or disabled persons to walk A61H3/00); OPERATING TABLES OR CHAIRS; CHAIRS FOR DENTISTRY; FUNERAL DEVICES (embalming corpses A01N1/00) ## Abstract A raising wheelchair comprises a wheeled frame and a raising system mounted to the frame and supporting a seat and a backrest. The raising system is configured to be movable between a lowered position and a raised position. The raising system includes at least one double-armed lever including a first lever member and a second lever member, a coupling member fixedly mounted to the frame, wherein the first lever member and the second lever member are pivotally coupled to the coupling member, and a coupling mechanism translationally coupled or pivotally coupled to a second end of the first lever member, pivotally coupled to a second end of the second lever member, and coupled to the backrest. The raising system maintains an orientation of the backrest relative to the ground that is substantially constant throughout substantially an entire range of movement between the lowered position and the raised position. ## Claims ### Claim 1 A raising system, comprising: (a) a seat; (b) a backrest operably coupled to the seat; (c) at least one double-armed lever comprising: (i) a first lever member comprising a first end and a second end; and (ii) a second lever member comprising a first end and a second end; (d) a coupling member pivotally coupled to the first end of the first lever member and the second end of the second lever member; and (e) a mechanism operably coupled to the second end of the first lever member, operably coupled to the second end of the second lever member, and coupled to the backrest, wherein the at least one double-armed lever, the seat, and the backrest are constructed and arranged to be moveable between a lowered position and a raised position, wherein the at least one double-armed lever maintains an orientation of the backrest relative to the ground that is consistent through substantially an entire range of movement between the lowered position and the raised position. ### Claim 2 (depends on 1) The raising system of claim 1, further comprising a wheeled frame to which the raising system is mounted. ### Claim 3 (depends on 2) The raising system of claim 2, wherein the wheeled frame and the raising system constitute a wheelchair. ### Claim 4 (depends on 1) The raising system of claim 1, wherein the coupling member is pivotally coupled to the first lever member at a first pivot point on the coupling member and is pivotally coupled to the second lever member at a second pivot point on the coupling member. ### Claim 5 (depends on 4) The raising system of claim 4, further comprising at least one footrest coupled to a first end of a leg support, wherein a second end of the leg support is pivotally coupled to the coupling member. ### Claim 6 (depends on 5) The raising system of claim 5, wherein the leg support is pivotally coupled at the second pivot point on the coupling member. ### Claim 7 (depends on 1) The raising system of claim 1, wherein the first lever member and the second lever member pivot with respect to the coupling member so that the first lever member maintains a substantially constant orientation with respect to the second lever member when the at least one double-armed lever is moved between the lowered position and the raised position. ### Claim 8 (depends on 7) The raising system of claim 7, wherein the first lever member and a second lever member together form a generally parallelogram shape, wherein the first lever member and the second lever member maintain the generally parallelogram shape during movement between the lowered position and the raised position. ### Claim 9 (depends on 1) The raising system of claim 1, wherein the mechanism is a backrest adjustment actuator constructed and arranged to allow for adjustment of an angle of the backrest relative to at least one of the seat, the first lever member, and the second lever member. ### Claim 10 (depends on 1) The raising system of claim 1, wherein the mechanism is a backrest adjustment actuator comprising a first component coupled to the backrest, a second component operably coupled to the first lever member, a third component pivotally coupled to the second lever member, and an actuatable knob constructed and arranged to allow for adjustment of an angle between the first component and at least one of the second component and the third component. ### Claim 11 A raising system, comprising: (a) at least one double-armed lever constructed and arranged to move between a lowered position and a raised position; (b) a seat and backrest support operably coupled to the at least one double-armed lever; (c) a distal coupling member pivotally coupled to the at least one double-armed lever; and (d) a proximal coupling member operably coupled to a second end of the at least one double-armed lever, and coupled to the backrest support, the proximal coupling member comprising an adjustment actuator comprising: (i) a gear that is movable between a first position and a second position; (ii) a spring that biases the gear into the first position; and (iii) an actuatable member for moving the gear from the first position to the second position, wherein the adjustment actuator is constructed and arranged to allow adjustment of an angle between the backrest support and the at least one double-armed lever, and wherein when in the first position, the gear operationally engages both the backrest support and the at least one double-armed lever in a fixed orientation with respect to one another, and, when in the second position, the gear engages only one of the backrest support or the at least one double-armed lever so that the backrest support can move with respect to the double-armed lever. ### Claim 12 (depends on 11) The raising system of claim 11, further comprising a wheeled frame to which the raising system is mounted. ### Claim 13 (depends on 12) The raising system of claim 12, wherein the wheeled frame and the raising system constitute a wheelchair. ### Claim 14 (depends on 11) The raising system of claim 11, further comprising at least one footrest coupled to a first end of a leg support, wherein a second end of the leg support is pivotally coupled to the distal coupling member. ### Claim 15 (depends on 11) The raising system of claim 11, further comprising one or more controls for operating the raising system. ### Claim 16 (depends on 11) The raising system of claim 11, further comprising a wheeled frame to which the raising system is mounted and at least one of a gas spring and a motor operably coupled to the at least one double-armed lever and the wheeled frame. ### Claim 17 (depends on 11) The raising system of claim 11, further comprising a wheeled frame to which the raising system is mounted and a suspension system for isolating a user from vibration transmitted from the surface being crossed through the wheeled frame. ### Claim 18 (depends on 11) The raising system of claim 11, wherein the at least one double-armed lever comprises: (a) a first lever member pivotally coupled to the distal coupling member at a first location on the distal coupling member; and (a) a second lever member is pivotally coupled to the distal coupling member at a second location on the distal coupling member. ### Claim 19 (depends on 18) The raising system of claim 18, wherein the first lever member and the second lever member pivot with respect to the distal coupling member so that the first lever member maintains a substantially constant orientation with respect to the second lever member when the at least one double-armed lever is moved between the lowered position and the raised position. ### Claim 20 (depends on 18) The raising system of claim 18, wherein the first lever member and a second lever member together form a generally-parallelogram shape, wherein the first lever member and the second lever member maintain the generally parallelogram shape during movement between the lowered position and the raised position.