WO-2026093517-A1 - LIFTING DEVICE

WO2026093517A1WO 2026093517 A1WO2026093517 A1WO 2026093517A1WO-2026093517-A1

Abstract

The present invention relates to a lifting system (1) for a wheelchair provided with an active, motor-driven drive system for a platform (2), and with a passive, non-motor-driven drive system for a gangway (3) movable between a rest position (P0) in a retracted state relative to the platform (2), and an active position (P1) in an extended state in front of the platform (2).<sb /> <sb /> The active, motor-driven drive system (10) is configured to move the platform (2) in height, and the passive, non-motor-driven drive system (11) is configured to automatically adjust a degree of extension (S) of the gangway (3) according to the height position (P c ) of the platform (2).

Inventors

STUCKI, Eric Adrien

Assignees

ITIZY MULTI SÀRL

Dates

Publication Date: 20260507
Application Date: 20251031
Priority Date: 20241031

Claims (15)

1. Wheelchair lift system (1) having a motorized active drive system for a platform (2), and a non-motorized passive drive system for a walkway (3) movable between a rest position (Po) in a retracted state relative to said platform (2), and an active position (Pi) in a prone state in front of said platform (2), said motorized active drive system (10) being configured to move said platform (2) vertically, and said non-motorized passive drive system (11) being configured to automatically adjust a forward position (S) of said walkway (3) according to the vertical position (Pc) of the platform (2).
2. Wheelchair lifting system (1) according to claim 1, characterized in that it comprises a chassis (4) provided with an access ramp (41) to said platform (2), as well as at least one first side railing (42), said motorized active drive system (10) being integrated into said first side railing (42) and jointly defining a maximum lifting height (H) for said platform (2) as well as a maximum extension stroke (C) of the advancement level (S) of said walkway (3) in active position (Pi).
3. Wheelchair lifting system (1) according to any one of the preceding claims, said passive drive system (11) of said platform (2) comprising means for elastically applying (5) of said walkway (3) outwards, and means for returning (6) of said walkway (3) inwards, said return means (6) being formed by a cable alleged to be of fixed length (60).
4. Wheelchair lifting system (1) according to claim 3, the advancement level (S) of said platform (3) being determined by a differential (A) of usable length (Lu) of said alleged fixed-length cable (6) between a first return roller (219A) integral with said platform (2) and an attachment point (31) of said platform (3), said useful length (Lu) of said alleged fixed length cable (6) depending on the distance (D) between a first fixed attachment point (601) of said alleged fixed length cable (6), and said first return roller (219A) attached to said platform (2).
5. Wheelchair lifting system (1) according to claim 4, non-motorized passive drive system (11) further comprising a translation guidance system for said walkway (3), said translation guidance system being formed by lateral rails (32) each equipped with a plurality of guide rollers (320).
6. Wheelchair lifting system (1) according to claim 4 or 5, said non-motorized passive drive system (11) further comprising an indexing system for adjusting the relative positioning between said walkway (3) and said platform (2).
7. Wheelchair lifting system (1) according to claim 6, where it depends on claim 5, a plurality of fixing holes (321) being provided in each of said side rails (32).
8. Wheelchair lifting system (1) according to any one of claims 4 to 7, characterized in that said platform (2) comprises a base plate (21) and a cover plate (22), said mobile walkway (3) moving between said base plate (21) and said cover plate (22) in the manner of a drawer.
9. Wheelchair lifting system (1) according to claim 8, when it depends on claim 5, characterized in that said elastic stress means (5) are formed by a first spring (51) of which a first end (511) is fixed to said base plate (21) and a second end (512) is fixed to a first lateral rail (32A), and a second spring (52), of which a first end (521) is fixed to said base plate (21) and a second end (522) is fixed to a second lateral rail (32B).
10. Wheelchair lifting system (1) according to any one of the preceding claims, characterized in that said non-motorized passive drive system (11) further contains exit stops (220A,220B) for said mobile platform (3) defining a maximum reduced extension stroke (C’) strictly less than said maximum extension stroke (C) for the advancement level (S) of said platform (3).
11. Wheelchair lifting system (1) according to claim 10, characterized in that a return system (210) comprising 4 fixed rollers (211, 212, 214, 215) and a movable roller (213) is provided to accommodate an excess length of cable (LE) in a cable magazine (7) in a configuration where the advance level (S) of said walkway (3) is limited to said reduced maximum extension stroke (C’) by said exit stops (220A, 220B) and where said platform (2) continues to be moved in height via said motorized active drive system (10).
12. Wheelchair lifting system (1) according to claim 11, characterized in that said movable roller (213) is guided in translation in said magazine (7) by means of a slide (72) sliding in a groove (701) provided in a rule (70) of said magazine (7), and forced into movement in said magazine (7) by a dedicated return spring (71).
13. Wheelchair lifting system (1) according to any one of the preceding claims, said mobile walkway (3) terminates at its front end by a pivoting flap (33).
14. A wheelchair lifting system (1) according to any one of the preceding claims, characterized in that it further contains an integrated safety system (8) at the rear of said platform (2) comprising a pivoting bar (81) arranged to move between a horizontal position, in the lowered position (PB) of said platform (2), where it is flush with the upper surface (20) of said platform (2), and a inclined position (Pi) where a retaining bar (811) protrudes above said platform (2).
15. Wheelchair lifting system (1) according to claim 14, said safety system integrated (8) at the rear of said platform (2) comprising pivoting rods (82) rotated by an activation spring (83), a first end (821) of said pivoting rods (82) being equipped with ground support casters (84), while a second end (822) of said pivoting rods (82) comprises a support surface (822A) adapted to support lateral uprights (810) of said pivoting frame (81), said pivoting rods (82) being movable between a horizontal position superimposed under said lateral uprights (810) in the lowered position (PB) of said platform (2), and an upright position (PR) in which said support surfaces (822A) support said lateral uprights (810) of said pivoting frame and maintain the latter in an inclined position. (Pi).

Description

LIFTING DEVICE Technical field of the invention The present invention relates to the field of freight elevators, and more particularly to lifting devices adapted for wheelchairs, baby strollers, or small trolleys. State of the art To enable elderly or disabled people to access different floors of a building, various devices such as stairlifts for wheelchairs or, for example, with a seat, are already available. Devices designed for wheelchairs generally include a mobile platform to support the wheelchair, as well as a motorized mechanism to move this platform up or down a ramp; alternatively, it can be operated by a hydraulic cylinder to move the platform from a lower level to a higher level by "skipping" a certain number of steps. However, this type of device has the disadvantage of being very expensive, particularly because of the need for custom installation according to the shape of each staircase on which it is to be installed, and the fitting of corresponding guide rails. Furthermore, when it comes to providing a suitable platform to overcome an obstacle of only a few steps for private housing, for example for a house that is not built on one level, it is very difficult to create a standardized device adaptable to any height and depth of usual steps. One aim of the proposed invention is to provide an exemplary solution to these known drawbacks. Summary of the invention In particular, one aim of the present invention is to provide a new solution for a wheelchair lifting system made at a lower cost, and which could be placed in as many homes as possible. These goals are achieved according to the invention through the features of the main claim, and in particular through a wheelchair lifting system provided with a motorized active drive system for a platform, and a non-motorized passive drive system for a mobile walkway between a resting position in a retracted state relative to the platform, and an active position in a stretched-out state at the front of the platform, the motorized active drive system being configured to move the platform vertically, and the non-motorized passive drive system being configured to automatically adjust a forward movement level of the walkway according to the vertical position of the platform. One advantage of the proposed solution is that it significantly reduces costs by eliminating the need for a second motor dedicated to the gateway and also indirectly eliminating the need for power supplies, since the gateway is moved entirely by mechanical means and therefore does not require any additional electrical power supply. Another advantage of the proposed solution is that it provides a simple and elegant solution suitable for various types of steps that may vary slightly in height and depth without requiring a custom solution each time. In a preferred embodiment, the lifting system comprises a chassis with a platform access ramp and at least one first side railing. The motorized active drive system is integrated into the first side railing and jointly defines a maximum lifting height for the platform and a maximum extension stroke for the walkway, which is reached in the active position. In this way, not only is access to the platform facilitated, but safety is maximized throughout the platform's movement. Integrating the motorized active drive system into a railing saves space, and the correlation between the platform's extension and elevation also allows for efficient calibration of the chassis's position relative to the steps that the lifting device is designed to span to provide access to a higher level. According to another preferred embodiment for the lifting system according to the invention, the passive drive system of the platform includes means for elastically activating the walkway outwards, and means for returning the walkway inwards, the return means being formed by a cable of fixed length. The advantage of this proposed embodiment is that it requires only conventional tension and return elements to ensure the kinematic link between the platform and the walkway; however, it may be noted that the use of a cable as a return element and an elastic element as a tension element towards the outside of the platform may appear counterintuitive. According to an even more preferred embodiment for the wheelchair lifting system according to the invention, the advancement level of said walkway is determined by a differential in the useful length of said cable, said to be of fixed length, between a first return roller attached to the platform and an attachment point of the walkway, the useful length of the cable, said to be of fixed length, depending on the distance between a first fixed attachment point of the cable, said to be of fixed length, and the first return roller attached to the platform. Such a configuration allows the vertical movement of the platform to be translated into a linear movement of the walkway with particular simplicity, thanks to purely geometric con