Protective helmet

1. A protective helmet, comprising:

a helmet shell for at least partially covering a head of a helmet wearer;

a holding strap arrangement arranged on the helmet shell for holding the helmet shell on the head of the helmet wearer, wherein the holding strap arrangement comprises a chin strap, a first closure part and a second closure part, the chin strap being connected to the helmet shell, the first closure part being connected to the helmet shell, the second closure part being connected to the chin strap and the second closure being configured to be brought into closed connection with the first closure part, with a closure being formed, wherein the closure automatically opens in a first closed position in event of a predetermined opening tensile force acting between the first closure part and the second closure part, and the first closure part and the second closure part being separate from each other, wherein, in a second closed position of the closure, the first closure part and the second closure part are always in closed connection with each other irrespective of a tensile force acting between the first closure part and the second closure part, wherein, in order to form a respective closed position, one of the first closure part and the second closure part comprises a pivotable pivoting component, the pivoting component being mounted pivotably on a basic body of the one of the first closure part and the second closure part comprising the pivotable pivoting component, wherein at least one tongue retaining receptacle is formed in the one of the first closure part and the second closure part comprising the pivotable pivoting component, and another one of the first closure part and the second closure part has a tongue arrangement for engaging in the at least one tongue retaining receptacle, wherein, in the first closed position, the pivoting component has a first introduction direction and a first removal direction oriented in an opposed manner with respect thereto, wherein, in order to form the first closed position, the tongue arrangement is configured to be inserted in a direction of the first introduction direction into the one of the first closure part and the second closure part comprising the pivoting component, and, in order to release the first closed position, the tongue arrangement is configured to be moved in a direction of the first removal direction out of the one of the first closure part and the second closure part comprising the pivoting component, wherein the at least one tongue retaining receptacle is bounded by a first retaining flank, the first retaining flank interacting in a retaining manner with the tongue arrangement in the first closed position, the first retaining flank having an inclination in relation to a perpendicular to the first introduction direction and, with respect to the perpendicular to the first introduction direction, the first retaining flank is inclined toward the first removal direction, as seen from laterally outside toward inside.

2. The protective helmet as claimed in claim 1 , wherein the opening tensile force at which the closure opens is greater than 130 N.

3. The protective helmet as claimed in claim 1 , wherein the opening tensile force at which the closure opens is less than 280 N.

4. The protective helmet as claimed in claim 1 , wherein the pivotable pivoting component has a first pivoting position and a second pivoting position corresponding to the first closure position and the second closure position of the closure, wherein the pivoting component is in each case locked in the first pivoting position and the second pivoting position.

5. The protective helmet as claimed in claim 1 , wherein the tongue arrangement has at least one resilient tongue arm.

6. The protective helmet as claimed in claim 5 , wherein the at least one resilient tongue arm has at least one retaining projection for holding the at least one resilient tongue arm in the at least one tongue retaining receptacle.

7. The protective helmet as claimed in claim 1 , wherein the first retaining flank encloses a first retaining angle which is between 60° and 80° with the first introduction direction.

8. The protective helmet as claimed in claim 1 , wherein, in the second closed position, the pivoting component has a second introduction direction and a second removal direction oriented in an opposed manner with respect thereto, wherein, in order to form the second closed position, the tongue arrangement is introduced in a direction of the second introduction direction into the second closure part comprising the pivoting component, and, in order to release the second closed position, the tongue arrangement is configured to be moved in a direction of the second removal direction out of the one of the first closure part and the second closure part comprising the pivoting component, wherein the at least one tongue retaining receptacle is bounded by a second retaining flank, the second retaining flank interacting in a retaining manner with the tongue arrangement in the second closed position, the second retaining flank being configured such that automatic opening of the second closed position is always prevented.

9. The protective helmet as claimed in claim 8 , wherein the second retaining flank encloses a second retaining angle which is at least 80° with the second introduction direction.

10. The protective helmet as claimed in claim 8 , wherein the inclination of the first retaining flank in relation to the first introduction direction and an inclination of the second retaining flank in relation to the second introduction direction differ from each other.

11. The protective helmet as claimed in claim 10 , wherein the second retaining angle is greater than the first retaining angle.

12. The protective helmet as claimed in claim 2 , wherein the opening tensile force at which the closure opens is greater than 150 N.

13. The protective helmet as claimed in claim 1 , wherein the opening tensile force at which the closure opens is less than 250 N.