| 摘要 |
A prop head bearing between the roof bar and the prop ( 4 ) of a shield-type support frame, comprising a ball-joint socket ( 3 ) on the roof bar and open towards the prop for receiving a ball-joint head ( 2 ) on the prop ( 4 ), with at least one movable securing element ( 6, 7 ) which, when in a secured position, engages in a recess ( 12, 13 ) in the joint head ( 2 ) to prevent accidental lifting of the joint head ( 2 ) out of the socket ( 3 ), and with a bolt which locks the securing element ( 6, 7 ) in the secured position, in which that the securing element is in the form of a securing pin ( 6, 7 ) movable along its longitudinal axis between the secured position and an assembly position, wherein the securing pin ( 6, 7 ) is lockable by the bolt ( 14, 19 ) in the assembly position, in which it does not engage in the recess ( 12, 13 ) in the joint head ( 2 ).
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