Boosting mechanism for stapler

Details Boosting mechanism for stapler Boosting mechanism for stapler

2001-07-10

2003-04-22

Rada, Rinaldi I. (Department: 3721)

Elongated-member-driving apparatus

With means to move or guide member into driving position

Including supply magazine for constantly urged members

C227S132000

Reexamination Certificate

active

06550661

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a boosting mechanism for a stapler which enables one to drive out a staple by weak force.
2. Description of the Related Art
Where something is stapled with a staple of a stapler, if the size of the staple is large or the number of staples or sheets of paper to be stapled is increased, it is necessary to press down a handle member by strong force to drive the staple into the sheets. Accordingly, handling of the stapler by women or children is not easy.
To cope with this, a stapler with a boosting mechanism as shown in
FIG. 7
is presented. In the boosting mechanism, a handle member
21
and a driver arm
22
for holding a driver are separately provided. The handle member
21
is pivotally mounted on a shaft
23
positioned somewhat rearward of a mid position of the driver arm
22
. A shaft
25
, which is provided to the driver arm
22
at further rearward of the shaft
23
, is engaged with an elongated hole
26
formed in the handle member
21
. When the handle member
21
is pressed down, strong force acts on the driver arm
22
according to the principles of the lever. Accordingly, the staple may be reliably driven with small driving-out force even if the staple is large in size or driven out into a thick sheet.
The principles of the lever is utilized in the stapler. For this reason, a point at which the shaft
25
of the clincher arm comes into engagement with the elongated hole
26
of the handle member serves as a point of action.
The inner edge of the elongated hole
26
receives a great force from the shaft
25
. When the shaft
25
, circular in cross section, engages with the inner edge of the elongated hole
26
, the former linearly contacts with the latter. Accordingly, a force acting on the inner edge of the elongated hole
26
is considerably large. In this condition, the inner edge of the elongated hole
26
will be gradually deformed. When the elongated hole
26
is deformed, the boosting effect by the handle member will be reduced.
SUMMARY OF THE INVENTION
Accordingly, an object of the present invention is to provide a boosting mechanism for a stapler which is free from the deformation by the force acting on the point of action and improved in durability.
To achieve the above object, there is provided a boosting mechanism for a stapler. In the boosting mechanism, bearing pieces are formed on both sides of the rear end of a clincher arm which includes a clincher table for bending a staple at the front end thereof. A magazine member, to which staples are loaded, and a driver arm for driving out a staple fed from the magazine member are pivotally mounted on an axle, which is provided at the rear ends of the bearing pieces. A handle member is rotatably disposed above the driver arm. A rotation supporting shaft of the handle member is provided at a position somewhat closer to the front than the axle of the bearing pieces. A pin, which is provided at a position closer to the front than the rotation supporting shaft of the handle member, is inserted into an elongated hole formed in each side plate of the driver arm.
Preferably, the boosting mechanism is constructed as follows:
The rotation supporting shaft is formed by burring the bearing pieces of the clincher arm. Engaging grooves to be brought into engagement with the rotation supporting shaft are formed in the handle member. Further, when the driver arm is driven to move in a staple driving direction by pressing the handle member, the rotation supporting shaft is brought into engagement with a semicircular front end of each of the engaging grooves.


REFERENCES:
patent: 1028778 (1912-06-01), Powers et al.
patent: 4399938 (1983-08-01), Biddle
patent: 5356063 (1994-10-01), Perez
patent: 5699949 (1997-12-01), Marks
patent: 5979736 (1999-11-01), Edeholt
patent: 6179193 (2001-01-01), Nagai
patent: 6209772 (2001-04-01), Wang

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