Single-firing trigger mechanism for a nailing machine

Details Single-firing trigger mechanism for a nailing machine Single-firing trigger mechanism for a nailing machine

2003-05-20

2003-12-09

Smith, Scott A. (Department: 3721)

Elongated-member-driving apparatus

With interlock means

C227S130000

Reexamination Certificate

active

06659324

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to an improved structure of a trigger of a nailing machine, and more particularly, for exactly reaching the single-firing effect.
2. Description of the Related Art
Nailing machines can be very dangerous tools. The operation thereof must be very careful in order not to injure persons around the working place. As shown in
FIGS. 7 and 8
, the trigger mechanism
20
of a conventional nailing machine
10
includes a trigger
21
, a torsion spring
22
, a slide piece
23
and a spring
24
. Under normal operation, a safety lever
12
at the front end of gun mouth
11
has to be compressed against a workpiece (not shown) for shifting the safety lever
12
inwardly and, therefore, the other end
13
thereof is pressed against the torsion spring
22
to be shifted backwards. At that time, the other end
221
of the torsion spring
22
presses the slide piece
23
to be shifted downwardly (see FIG.
9
). When the slide piece
23
is moved downwards, a position difference is created between a deep hole
231
adjacent to the middle part of the slide piece
23
and a firing pin
14
. By pressing down the trigger
21
, a single-firing effect is reached. Under the precondition that the safety lever
12
is not moved inwardly, the firing pin
14
can extend into the deep hole
231
of the slide piece
23
(see
FIG. 11
) when the operator presses down the trigger
21
. Therefore, the safety effect to prevent from firing is reached.
Referring to
FIG. 10
, the trigger is in a compressed state after firing. If the operator unintentionally cause the safety lever
12
to be in contact with any object, an unexpected nailing effect is also created since the slide piece
23
is situated in the compressed state, too. In other words, the spring
24
can't move the slide piece
23
upwardly to the safety position due to the continuous frictional relationship between the slide piece
23
and the firing pin
14
, thereby leading to tremendous operational danger.
SUMMARY OF THE INVENTION
It is a primary object of the present invention to remove the above-mentioned drawbacks and to provide a safer trigger mechanism. After completion of an expected single firing operation, the contact piece touching the firing pin can be automatically removed from or spring away from the safety level. Under the precondition that the trigger is not released in place, the next firing operation is disabled no matter which object the safety lever touches, unless the trigger is released in place according to standard operational procedure.


REFERENCES:
patent: 5551621 (1996-09-01), Vallee
patent: 5791545 (1998-08-01), Lin
patent: 5836501 (1998-11-01), Lai
patent: 6116488 (2000-09-01), Lee
patent: 6213372 (2001-04-01), Chen
patent: 6422446 (2002-07-01), Liu
patent: 6588642 (2003-07-01), Wang et al.

Affiliated with

Also associated with

Rating

Single-firing trigger mechanism for a nailing machine does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Single-firing trigger mechanism for a nailing machine, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Single-firing trigger mechanism for a nailing machine will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3147982