Nail-driving gun with safety device

Details Nail-driving gun with safety device Nail-driving gun with safety device

2002-03-04

2002-09-17

Smith, Scott A. (Department: 3721)

Elongated-member-driving apparatus

With interlock means

C227S130000

Reexamination Certificate

active

06450387

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a nail-driving gun, and more particularly to a nail-driving gun having a safety device, which includes a safety rod that is movable between a front limit position, where nail shooting is prevented, and a rear limit position, where the nail shooting is permitted.
2. Description of the Related Art
Referring to
FIG. 1
, a conventional driving gun
10
is shown to include a handle
11
, a barrel
12
, a trigger member
13
, a safety rod
14
, and a nail case unit
15
. The handle
11
is provided with a movable valve rod
111
. The barrel
12
has a front portion that is provided with a nail-shooting seat
121
, and a rear portion that is attached to an upper end of the handle
11
. The trigger member
13
is mounted pivotally on the handle
11
. A pushing plate
131
is connected pivotally to the trigger member
13
. The safety rod
14
has a tubular front end
141
that is disposed around a front end of the nail-shooting seat
121
, and a rear end
142
. A free end of the pushing plate
131
is biased by a spring (not shown) to abut against the rear end
142
of the safety rod
14
. The nail case unit
15
has a case body that is attached to the nail-shooting seat
121
.
When the gun
10
is not in use, the safety rod
14
is biased by a spring (not shown) to a front limit position, where the pushing plate
131
is spaced apart from the valve rod
111
even when the trigger member
13
is pressed. When it is desired to shoot a nail from the gun
10
, the front end
141
of the safety rod
14
is pressed against a wall, into which the nail is to be driven, so as to move the safety rod
14
to a rear limit position, where the rear end
142
of the safety rod
14
pushes rearward the free end of the pushing plate
131
so that the valve rod
111
can move rearward on the handle
11
when the trigger member
13
is pressed. As such, compressed air is fed into the nail-shooting seat
121
, thereby shooting the nail from the front end
141
of the safety rod
14
.
The safety rod
14
suffers from the following disadvantages:
(1) The safety rod
14
is relatively long, thereby hindering its smooth movement during operation.
(2) The safety rod
14
has a relatively long portion that extends outwardly of the nail-shooting seat
121
, thereby affecting adversely the appearance of the gun
15
.
(3) The front end
141
of the safety rod
14
has a relatively large cross-sectional area, thereby affecting utility of the gun
15
.
SUMMARY OF THE INVENTION
An object of this invention is to provide a nail-driving gun, which includes a safety device that can move smoothly during operation.
Another object of this invention is to provide a nail-driving gun, which includes a safety device that is concealed within a nail-shooting seat except for a front end, thereby improving the appearance of the gun.
Still another object of this invention is to provide a safety device for a nail-driving gun, which has a portion that is to be pressed against a wall and that has a relatively small cross-sectional area, thereby enhancing utility of the gun.
According to this invention, a nail-driving gun includes a gun body that has a handle and a nail-shooting seat. A safety device includes an upper plate, a lower plate, and a safety rod. The upper and lower plates can move synchronously between top and bottom plates of the nail-shooting seat. The safety rod has a front end that is attached fixedly to a rear end portion of the assembly of the upper and lower plates. The upper and lower plates have front ends that project forward from the nail-shooting seat and that can be pressed against a wall so as to move the safety rod to a rear limit position, where the trigger member can be actuated to shoot a nail from the nail-shooting seat.
Because the safety rod is relatively short, it can move smoothly during operation.
Moreover, the portions of the upper and lower plates other than their front ends are concealed between the top and bottom plates of the nail-shooting seat, thereby improving the appearance of the gun.
In addition, a front end of the assembly of the upper and lower plates of the safety device is relatively thin, thereby enhancing utility of the gun.


REFERENCES:
patent: 5551621 (1996-09-01), Vallee
patent: 5791545 (1998-08-01), Lin
patent: 5836501 (1998-11-01), Lai
patent: 5862969 (1999-01-01), Lee
patent: 6059161 (2000-05-01), Chang et al.
patent: 6116488 (2000-09-01), Lee
patent: 6213372 (2001-04-01), Chen
patent: 6357647 (2002-03-01), Ou

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