Abstract: A variable-length crutch 1 has a main body 2, a foot 5 extensible and retractable with respect to the main body 2, and an actuator, which actuator involves a motor 6, a rotary output shaft 9, an irreversible worm transmission converting rotation of the motor shaft 9 into linear movement of the foot 5 with respect to the main body 2, a sensor 10 for extending the foot 5 with respect to the main body 2, and a programmable module 8 connected to the motor 6 to control extension and/or retraction of the crutch to a preprogrammed length and to stop the motor 6 when the length is reached.

Abstract: The invention concerns a variable-length crutch 1 comprising a main body 2, a foot 5 extensible and retractable with respect to said main body 2, and an actuator comprising a motor 6 with a rotary output shaft 9 and a worm transmission in order to convert a rotation of said motor shaft 9 into a linear movement of said foot 5 with respect to the main body 2. The worm transmission is irreversible. The actuator also comprises a programmable module 8 controlling the motor 6 and a sensor 10 for extending the foot 5 with respect to the main body 2. The module 8 is connected to said motor 6 in order to control the extension and/or retraction of the crutch to a preprogrammed length and to stop the motor 6 when said length is reached.

Abstract: The invention concerns a variable-length crutch 1 comprising a main body 2, a foot 5 extensible and retractable with respect to said main body 2, and an actuator comprising a motor 6 with a rotary output shaft 9 and a worm transmission in order to convert a rotation of said motor shaft 9 into a linear movement of said foot 5 with respect to the main body 2. The worm transmission is irreversible. The actuator also comprises a programmable module 8 controlling the motor 6 and a sensor 10 for extending the foot 5 with respect to the main body 2. The module 8 is connected to said motor 6 in order to control the extension and/or retraction of the crutch to a preprogrammed length and to stop the motor 6 when said length is reached.