FIELD: mining and building, particularly material shifting devices adapted to releasably connect replaceable bit of excavation tooth with transitional extension structure fastened thereto.
SUBSTANCE: replaceable bit is telescopically put on transition extension and removably secured thereto by means of elongated flat connection unit provided with side peripheral part free of constriction. Connection unit extends in longitudinal direction through bit and connection orifices aligned with each other and prevents bit removal from transitional extension by forward movement thereof. Transversal support surface of bit side facing one end of connection unit prevents it outward passage through one bit orifice. Blocking member supported by another connection unit end and engaged with groove in another bit orifice prevents outward connection member passage through bit orifice provided with grooves. Support structure releasably retains the blocking member in closing and opening directions, which prevent blocking member displacement parallel to connection unit length.
EFFECT: simplified working tool replacement.
51 cl, 5 dwg
