| 摘要 |
A sheetrock corner finishing tool is disclosed for supplying and smoothing mastic into the corner seam of adjacent sheet rock panels. The finishing tool comprises an applicator head comprising a coupler. The coupler comprises a socket, which may comprise a seal, and a stationary member opposed to a retractable biased member. The coupler engages and disengages a mastic nozzle. The stationary member comprises a cooperating surface which may correspond to a surface of the nozzle. The biased member comprises a first cooperating surface corresponding to a surface on the nozzle and a second cooperating surface that may correspond to a surface on the nozzle. When the biased member is retracted, the respective cooperating surfaces permit engagement and disengagement of the nozzle. The cooperating surface of the stationary member and the second cooperating surface of the biased member lock the nozzle within the socket, while permitting the nozzle substantial working movement.
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