Explanations:
I. Whole View
HI = inside height
H = passageway height
S = fall height
II. Cutting for locking hook
B = passageway width
BI = inside width
X = 0.5 x (BI - B)
III. Security Lock
Attention: the locking bolt does not belong to the scope of supply!
Around mass and details recognizable is to be shown the drawing disproportional. Here for a drawing true to scale (PDF) you click:


