WRAP SPRING MECHANISM
A wrap spring mechanism, which has a wrap spring and a closer which is rotatable relative to the wrap spring and which has a driver which acts on one end of the wrap spring in order to bring this into positive contact with a friction surface assigned to the wrap spring for blocking the wrap spring mechanism. The wrap spring mechanism has a plurality of coaxial, axially offset wrap springs.
1 . A wrap spring mechanism, comprising:
a wrap spring; and
a closer which is rotatable relative to the wrap spring and which has a driver which acts on one end of the wrap spring in order to bring this into positive contact with a friction surface assigned to the wrap spring for blocking the wrap spring mechanism,
wherein the wrap spring mechanism as a plurality of coaxial, axially offset wrap springs.
2 . The wrap spring mechanism of claim 1 , wherein the wrap spring mechanism has two coaxial, axially offset wrap springs.
3 . The wrap spring mechanism of claim wherein the friction surface is annular.
4 . The wrap spring mechanism of claim 1 , wherein the wrap springs are accommodated in an interior of a sleeve.
5 . The wrap spring mechanism of claim 4 , wherein the friction surface is formed on an inner side of the sleeve.
6 . The wrap spring mechanism of the claim 1 , wherein the or both wrap springs are the same size.
7 . The wrap spring mechanism of claims 1 , wherein a wrap spring has three to five windings.
8 . The wrap spring mechanism of claim 1 , wherein a closer is provided which can be set in rotation by an external torque in order to move the or both wrap springs into a blocking position.
9 . The wrap spring mechanism of claim 1 , wherein the opener, which can be set in rotation by a drive motor, is provided in order to move the or both wrap springs into an open position.