Barrel unit with a removable cover plate for a nail driving gun

摘要

A barrel unit for a nail driving gun includes an elongated base plate and an elongated cover plate. The base plate has a top side formed with a longitudinal discharge groove, a pair of upwardly extending positioning lugs at a rear portion of the base plate, and a pair of upwardly extending hooking lugs at a front portion of the base plate. Each of the positioning lugs has a rearwardly inclining rear end surface. The cover plate is formed with a pair of first slots and a pair of second slots which permit extension of a respective one of the positioning lugs and the hooking lugs therethrough. Each of the first slots has a rearwardly inclining end wall surface which abuts against the rear end surface of the respective one of the positioning lugs when the cover plate is superimposed on the base plate. The cover plate further has an operating lever which is mounted pivotally thereon, and a U-shaped fastener which has two ends connected pivotally to the operating lever and which is pivotable so as to engage the hooking lugs on the base plate when the cover plate is superimposed on the latter. The operating lever is pivotable so as to pull the fastener to engage tightly the hooking lugs.