Retractable leash for rolling up and unrolling a leash

1. A retractable leash device for rolling up and unrolling a leash, the leash device comprising:

a carrier;

a leash roller mounted rotatably on the carrier;

a resetting means for resetting the leash on the leash roller into a rolled-up position, in which the leash is wound up onto the leash roller;

a blocking means for blocking the unrolling of the leash from the leash roller;

a transmission coupled to the leash roller to bring about blocking of the blocking means when a predetermined leash length is unrolled from the leash roller, the transmission comprising a first transmission element arranged rotatably relative to the carrier, and a second transmission element arranged nonrotatably relative to the carrier, wherein the first transmission element has an inner circumferential surface and the second transmission element has an outer circumferential surface associated with the inner circumferential surface, the outer circumferential surface and the inner circumferential surface meshing with one another at least in an active state; and

a release means for releasing the first transmission element and the second transmission element from one another, the release means comprising a manual, adjustable release element comprising a rotatable release disk, the rotatable release disk comprising at least one slope, on which slides at least one cam comprised of a slope associated with the second transmission element, for the release thereof.

2. The retractable leash device in accordance with claim 1 , wherein:

the outer circumferential surface is smaller than the inner circumferential surface;

the outer circumferential surface has external teeth and the inner circumferential surface has internal teeth which mesh with one another; and

a number of teeth of the external teeth is smaller than a number of teeth of the internal teeth.

3. The retractable leash device in accordance with claim 1 , wherein:

the transmission is an eccentric cycloidal transmission; and

the first transmission element is mounted eccentrically on the leash roller and rotatable relative to the leash roller.

4. The retractable leash device in accordance with claim 1 , further comprising a transfer means comprising a push rod for transmitting a release torque to the blocking means, wherein:

the first transmission element comprises the release means comprising the adjustable release element arranged at the outer circumferential surface;

the release element comprises a projection for bringing about the blocking of the blocking means; and

the transfer means can be reset into an inactive position by means of a spring.

5. The retractable leash device in accordance with claim 4 , wherein:

the blocking means comprises a blocking element that meshes with the leash roller for the blocking of the unrolling of the leash from the leash roller; and

the blocking element can be pivotably reset into a blocked position reinforced by an unrolling motion of the leash roller and into an inactive position by means of a spring.

6. The retractable leash device in accordance with claim 5 , wherein:

the blocking element can be brought into active connection with the release means;

the leash roller has a carrier element moveable therewith;

the blocking element comprises an abutting section that is brought to mesh with the carrier of the leash roller; and

the blocking element is pivoted into the blocked position.

7. The retractable leash device in accordance with claim 1 , further comprising an actuating means for manually actuating the blocking means, wherein the actuating means comprises a pushbutton.

8. The retractable leash device in accordance with claim 1 , wherein a selection means is provided for selecting the predetermined leash length.

9. The retractable leash device in accordance with claim 8 , further comprising a housing connected to the carrier wherein:

the selection means comprises an adjusting means for adjusting an angular position of the second transmission element relative to the carrier continually or gradually; and

a display of the angular position, corresponding to a selected predetermined leash length, is provided on the housing.