| 摘要 |
A boltless U-shaped holding clamp providing resilient clamping force and a reversible cutting tooth made from solid, hardened bar stock material. The clamp has a snout receiving channel for wedgedly engaging locking grooves of a digging member shank, and a tooth receiving channel of constant transverse cross section for receiving the hardened reversible tooth, also of constant transverse cross section. The bar stock tooth includes beveled cuts at each end which mate with an inclined stopper wall in the rear of the tooth receiving channel of the clamp when the tooth is inserted therein. Axial forces on the tooth during excavation or digging operations drive the clamp into greater frictional engagement thereby to achieve self-tightening. Self-tightening is facilitated by differential friction at the respective clamp-tooth and tooth-shank interfaces such that axial forces on the tooth act first to drive the clamp upon the snout to increase the wedging grip rather than permitting the tooth to slide against the shank through the receiving channel of the clamp. The clamp body also has a certain modulus of elasticity to provide the resilient clamping force so as to absorb impact and vibrational forces. A worn tooth may be reversed or extended thereby providing greater consumption of the expensive tooth material. Protector or spacer blocks are provided in the tooth receiving channel to extend a worn tooth for greater consumption thereof.
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