Single and automatic trigger device for staplers

Details Single and automatic trigger device for staplers Single and automatic trigger device for staplers

2002-11-26

2003-07-08

Smith, Scott A. (Department: 3721)

Elongated-member-driving apparatus

With interlock means

C227S130000

Reexamination Certificate

active

06588642

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates to a trigger device which has an adjustable device for shifting single and automatic function of a stapler.
BACKGROUND OF THE INVENTION
A conventional trigger device of a stapler is shown in
FIGS. 1 and 2
and generally includes a trigger
11
pivotally connected to the body of the stapler
10
and an activating member
12
as shown in
FIG. 2
is located at the back of the trigger
11
. The trigger
11
has an opening
15
defined therethrough and an activating member
12
has a recess
16
defined in a top thereof. A safety plate
14
is movably connected to the stapler and has a tongue
140
which extends in the opening
15
and located in correspondence with the recess
16
of the activating member
12
so that if the trigger is pulled before the safety plate
14
is pushed, there will be no action for the valve member
13
. The safety plate
14
has to be pushed to let the tongue
140
push the activating member
12
to push the spring
130
and the activating member
12
is pivoted toward the valve member
13
of the stapler
10
. After the safety plate
14
is pushed, the valve member
13
is pushed by the activating member
12
which is pushed by the trigger
11
. Nevertheless, the conventional trigger device can only eject the staples one by one and cannot make an automatic stapling.
The present invention intends to provide a trigger device that has an adjustable device for shifting single shooting into automatic shooting.
SUMMARY OF THE INVENTION
In accordance with one aspect of the present invention, there is provided a trigger device for staplers and the trigger device comprises a trigger pivotably connected to a stapler body and an opening is defined through the trigger. A cam device is rotatably engaged with the trigger and connected to an activating member inserted in the opening of the trigger. A top plate extends at an angle from the activating member and the activating member is movable upward and downward by rotating the cam device. A safety plate is slidably connected to the stapler body and a distal end of the safety plate is located in correspondence with the opening of the trigger.
The primary object of the present invention is to provide a trigger device for a stapler which has a cam device to move the activating member to change the corresponding position between the safety plate and the activating member so as to switch single shooting and automatic shooting functions.


REFERENCES:
patent: 5551621 (1996-09-01), Vallee
patent: 5667127 (1997-09-01), Ichikawa et al.
patent: 5669541 (1997-09-01), Ronconi
patent: 5785227 (1998-07-01), Akiba
patent: 5791545 (1998-08-01), Lin
patent: 5836501 (1998-11-01), Lai
patent: 6116488 (2000-09-01), Lee
patent: 6422446 (2002-07-01), Liu

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