Appeal No. 2004-0364 Page 5
Application No. 09/943,293
Chen's invention relates to a nail driving gun, more particularly to a barrel unit
with a removable cover plate for a nail driving gun. Referring to Figure 5, the preferred
embodiment of a barrel unit according to Chen's invention is shown to be installed on a
front end of a nail driving gun 30 and includes an elongated base plate 40 and an
elongated cover plate 50 to be superimposed on the base plate 40. The base plate 40
extends forwardly from the housing of the nail driving gun 10 and has a top side formed
with a longitudinal discharge groove 400, a pair of upwardly extending positioning lugs
41 which are disposed respectively on opposite sides of the discharge groove 400 and
which are located at a rear portion of the base plate 40, and a pair of upwardly
extending hooking lugs 42 which are disposed respectively on opposite sides of the
discharge groove 400 and which are located at a front portion of the base plate 40.
Each of the positioning lugs 41 has a rearwardly inclining rear end surface 411.
Chen's cover plate 50 is formed with a pair of first slots 51 and a pair of second
slots 52 which permit extension of a respective one of the positioning lugs 41 and the
hooking lugs 42 therethrough. Preferably, the first and second slots 51, 52 are slightly
longer than the respective one of the positioning lugs 41 and the hooking lugs 42. Each
of the first slots 51 has a rearwardly inclining end wall surface 511 which abuts against
the rear end surface 411 of the respective one of the positioning lugs 41 when the
cover plate 50 is superimposed on the base plate 40. An operating lever 53 is mounted
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Last modified: November 3, 2007