Chain lock for round-link chains underground

摘要

Round-link chains according to DIN 22252 are installed underground for conveyor and cutting systems for the purpose of obtaining an endless chain as connecting members. These connecting members are the weakest link in the chain, because they have no expansion, also have a fastening which is not technically efficient and are held together by clamping pins which reduce the cross-section and, moreover, also quickly become rusty, this having an adverse effect on the dismantling. In principle, chain locks in cutting systems are regularly exchanged for new chain locks after a specific operating time, thus, for example, after 14 days. According to the invention, the abovementioned disadvantages are eliminated in that the chain lock possesses a continuous chain-link leg which has a smaller cross-section curved towards the centre, that is to say resilient, which absorbs the expansion of the chain lock. A high tensile force and a high bending moment are achieved with the rotatably mounted spline-shaft/spline-hub connection. The chain-lock connection with the spline-hub toothing receives two friction plates which serve as a safeguard against rotation and which thus make clamping pins unnecessary. The chain lock thus consists of two assembly parts, namely the chain shackle and the connection piece, and is therefore simple to mount and dismantle.