Hole-punching pliers

Cutlery – Perforating or indenting implements – Pivoted handles

Reexamination Certificate

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Details

C030S363000

Reexamination Certificate

active

06282796

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an improved hole-punching pliers which is equipped with a link arm serving as a pivot center in operation. The hole-punching pliers has a holding part and a pressing part that are in pivotal combination with each other. The holding part and the pressing part are provided respectively with a dentate section so that they can be partially in mesh with each other in assembly. Thereby when the holding part and the pressing part are held by a pair of connection plates and pressed with force, the mesh teeth of the dentate engaging sections of the holding part and the pressing part in mesh with each other helps more effective transmission of force applied to the holding part and the pressing part to punch a hole on an object with ease and no effort at all.
2. The Prior Art
Referring to
FIGS. 1
,
2
, conventionally, a hole-punching pliers has two pivotal parts, a holding part
10
having a holding section
11
at a rear end thereof and a pressing part
20
having a pressing section
21
at a rear end thereof that are pivotally combined together by way of a pin shaft
30
located in mounting holes
13
(
22
). The holding part
10
also has an open insertion space
12
and the pressing part
20
also has a mounting hole
24
. A rotary hole-punching wheel
40
is secured to a front end of the pressing part
20
and an anvil
14
is disposed at a front end of the holding part
20
. The rotary hole-punching wheel
40
having a plurality of punching rods
41
which can be rotated for selection of a proper punching rod
41
having a proper diameter is fixed in place by a retaining arm
50
having a retaining end
51
engaged with a fixing hole
23
so that holes of different diameters can be punched when a force is applied to the holding part and the pressing part at the same time. Such a prior art hole-punching pliers is typically designed and must be operated with relative effort.
SUMMARY OF THE INVENTION
Therefore, the primary object of the present invention is to provide an improved hole-punching pliers which has a spring-operated holding part and a pressing part that are pivotally engaged with each other at one end by way of gear-like or dentate sections and a pair of connection plates whereby an effective double lever result can be generated at the hole-punching wheel and an anvil spot in a ratio of 1:1.5 when a small force is applied to the holding section and the pressing section of the hole-punching pliers. So, only a half amount of force is used to effect a hole-punching task.


REFERENCES:
patent: 664299 (1900-12-01), Smith
patent: 734157 (1903-07-01), Bernard
patent: 889075 (1908-05-01), Walter
patent: 898397 (1908-09-01), Whitney
patent: 1308272 (1919-07-01), Berglund
patent: 4193191 (1980-03-01), Sisco
patent: 5101566 (1992-04-01), Crapo et al.

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