Unit for synchronous extension and retraction of two wire segments, and a motor vehicle having such a unit

A unit (1) for synchronous extension and retraction of two wire segments (3,4) wound onto a storage spool (20) in such a way that upon a rotary motion of the storage spool (20) in one rotation direction, both wire segments (3,4) are synchronously unwound, and upon a rotary motion of the storage spool (20) in the other rotation direction they are synchronously rewound, the wire segments (3,4) being separated from one another and being fastened at their storage-spool ends to the storage spool (20),

• wherein the storage spool (20) comprises a blocking mechanism (33,34) that, when engaged, blocks rotation of the storage spool (20) in the rotation direction in which the wire segments (3, 4) are unwound from the storage spool (20), and is releasable via an actuation device;
• and
• wherein the storage spool (20) is arranged on a rear access panel of a motor vehicle, which panel is pivotable about a horizontal axis from a closed position into an open position and vice versa, the wire segments (3, 4) extending from the storage spool (20) to both sides of the rear access panel and from there to the body, where their ends are fastened in such a way that the wire segments (3, 4) are unwound from the storage spool (20) upon opening of the rear access panel.