Formfitting securing device for a roller
A formfitting securing device for a roller has a rotation blocking engagement part which is biased into an engagement position by means of a first spring. The first spring exerts a bias onto the rotation-blocking engagement part both in the engaged position as well as in the nonengaged position, and a bias is achieved in the non-engaged position by acting on the rotation-blocking engagement part by means of a second spring.
1. A formfitting securing device for a roller that has a running wheel and a fork, the formfitting securing device being configured to block the running wheel of the roller with respect to a geometric running wheel axis, the formfitting securing device comprising:
a rotation-blocking engagement part,
a first spring that biases the rotation-blocking engagement part into an engagement position, wherein the first spring exerts a bias on the rotation-blocking engagement part, both in an engaged position and also in a non-engaged position,
a second spring that acts on the rotation blocking engagement part to achieve a bias in the non-engaged position,
a lever part that is configured to interact with the second spring to release a force of the second spring on the rotation-blocking engagement part, wherein said lever part can be acted upon by a linearly displaceable tappet, and a movement direction of the rotation-blocking engagement part defines an angle (α) with a movement direction of the tappet,
wherein the angle (α) is a right angle or an acute angle,
wherein the release of the force of the second spring on the rotation-blocking engagement part is carried out as a result of a rotational displacement of the lever part counter to an acting force of the second spring,
wherein the rotation-blocking engagement part is displaced after said release in a direction of the engagement position, solely as a result of the first spring acting directly on the rotation blocking engagement part,
wherein the rotation-blocking engagement part is provided in combination with a friction locking device, and
wherein the lever part, the rotation-blocking engagement part and the first and second springs are arranged in a mutual holding part.
2. The formfitting securing device according to claim 1 , wherein the first spring is a cylindrical compression spring.
3. The formfitting securing device according to claim 1 , wherein the second spring is a leg spring.