| 摘要 |
The device has a pawl (25) positioned between a front face of a support plate (1) and a securing unit i.e. slide forming piece (19), of the plate. The pawl pivots around a rotation axle (26) secured to the front face of the plate. An end of the pawl is provided with a hook (27) cooperating with a notch (6) of a support arch (3). Another end of the pawl comprises a curved arm (28) extending perpendicular to the hook. The arm is supported on a bottom edge of the arch when the hook is withdrawn from the notch to allow removal of the arch from the securing unit. |
