摘要 |
<p>The device (1) has two axle stub with an angle of less than one hundred eighty degree in operating position, where one of the two axle stub has whetting unit. The axle stub operating position comprises an angle within range of sixty degree to one hundred forty degree and within range of eighty degree to one hundred ten degree e.g. from hundred degree, where axle stubs are jointly connected with each other.</p> |