Mine heading monorail chain fastening - has screw with integral hook one end adapted in section to suit chain in cranked screw recess
Mineheading monorail chain lashing for supports comprises a cranked screw taking a chain link and with two diverging screw ends to act on hooks, one hook forming a clamp plate drawn onto the support flank by a nut threaded onto the cranked screw. The second hook (25) is integrated with the cranked screw itself (6) and runs back to the cranked area (7). The sections of the hook (25) differ from the circular shape of the threaded (12) end (11) of the screw so as to adapt to the inside space of the chain link passed through the cranked screw recess (7). Pref. the distance from the centre of this recess (7) to the inside contour of the screw hook part (27-29) should exceed that between the centre and the inside contour of the hook designed as clamp plate (21-23).