Floor-cleaning machine

The floor cleaning device (10;

• 110;
• 210;
• 310;
• 410) of any one of the preceding claims, characterized in that a spring length of the spring member (160;
• 260;
• 360;
• 460) increases at least at phases in the first angular range and in the second angular range when pivoting in the first pivot direction (S1).

The floor cleaning device (10;

• 110;
• 210;
• 310;
• 410) of any one of the preceding claims, characterized in that the spring member (160;
• 260;
• 360;
• 460) is a tension spring.

The floor cleaning device (10;

• 110;
• 210;
• 310;
• 410) of any one of the preceding claims, characterized in that the spring member (160;
• 260;
• 360;
• 460) comprises a spring-damper member.

The floor cleaning device (10;

• 110;
• 210;
• 310;
• 410) of any one of the preceding claims, characterized in that the spring member (160;
• 260;
• 360;
• 460) is further operatively connected to the floor unit (12;
• 112;
• 212;
• 312;
• 412) and the guide member (14;
• 114;
• 214;
• 314;
• 414) in such a way that the righting torque at a pivot angle relative to the neutral position in the first angular range and/or in the second angular range compensates for a torque acting on the first pivot joint (18, 118) about the first pivot axis (A), in particular a torque resulting from the weight of the guide member (14;
• 114;
• 214;
• 314;
• 414).

The floor cleaning device (10;

• 110;
• 210;
• 310;
• 410) of any one of the preceding claims, characterized in that the spring member (160;
• 260;
• 360;
• 460) is further operatively connected to the floor unit (12;
• 112;
• 212;
• 312;
• 412) and the guide member (14;
• 114;
• 214;
• 314;
• 414) in such a way that the spring force and/or the righting torque in the neutral position amount to zero.

The floor cleaning device (10;

• 110;
• 210;
• 310;
• 410) of any one of the preceding claims, characterized in that, when pivoting in the first pivot direction (S1), the second angular range is followed by a third angular range in which the righting torque has a negative sign.

The floor cleaning device (10;

• 110;
• 210;
• 310;
• 410) of any one of the preceding claims, characterized in that at the end of the second angular range facing away from the neutral position, the pivot angle relative to the neutral position is at least 70 degrees, preferably at least 80 degrees, particularly preferably at least 90 degrees.

The floor cleaning device (10;

• 110;
• 210;
• 310;
• 410) of any one of the preceding claims, characterized in that the spring member (160;
• 260;
• 360;
• 460) does not exert any spring force on the guide member (14;
• 114;
• 214;
• 314;
• 414) in a fourth angular range when pivoting from the neutral position in a second pivot direction (S2) opposite to the first pivot direction (S1).