Cutlery – Perforating or indenting implements
Reexamination Certificate
1999-09-09
2001-04-24
Watts, Douglas D. (Department: 3724)
Cutlery
Perforating or indenting implements
C083S684000
Reexamination Certificate
active
06219925
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a punch, and more particularly to a punch having one or more punching members that may be replaced with each other.
2. Description of the Prior Art
Typical punches comprise a punch rod slidably received in a housing, a knob secured on top of the punch rod for forcing the punch rod downward to cut or to punch the sheet members. A spring is engaged with the punch rod for biasing the punch rod away from the sheet members before the punch rod is depressed against the sheet members. The punch rod has a predetermined shape which may be used to punch or to form a predetermine-shaped pattern on the sheet members. The patterns may not be changed.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional punches.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a punch including one or more punching members that may be replaced and changed with each other according to the user's need.
In accordance with one aspect of the invention, there is provided a punch comprising a plate, a mold piece disposed on the plate and including a cavity formed therein, an arm including a first end having a barrel secured thereon, and including a second end secured to the plate, a shaft slidably received in the barrel and including a bottom end extended downward and outward of the barrel, a punch rod secured to the bottom end of the shaft and moved in concert with the shaft, means for moving the shaft and the punch rod downward to actuate on the mold piece.
The shaft includes a middle portion, the moving means includes a lever having a first end pivotally secured to the barrel at a pivot axle and having a middle portion, and a pin engaged through the middle portions of the lever and of the shaft for allowing the lever to move the shaft and the punch rod to actuate on the mold piece. The barrel includes an oblong hole formed therein for slidably receiving the pin and for allowing the pin to be moved up and down relative to the barrel. A spring biasing device is further provided for biasing the shaft and the punch rod away from the mold piece.
A securing device is further provided for securing the punch rod to the shaft and includes a catch secured to the shaft and having one or more ribs detachably engaged into one or more engaging channels of the punch rod for detachably securing the punch rod to the shaft. A gasket is further engaged between the punch rod and the catch for securing the punch rod to the catch.
A device is further provided for aligning the punch rod with the mold piece and includes a housing having a bottom portion, a board secured to the bottom portion of the housing and having a hub provided thereon for slidably receiving the punch rod, and means for guiding the punch rod to move relative to the housing and the board. The guiding means includes at least one guide rail formed on the hub of the board, and at least one slot formed in the punch rod for slidably receiving the guide rail and for guiding the punch rod to move relative to the housing and the board and for preventing the punch rod from being rotated relative to the housing and the board.
The housing includes at least one depression formed therein, the board includes at least one projection extended therefrom and engaged into the depression of the housing for further securing the board to the housing. A panel includes a hole formed therein for receiving the mold piece, and means for detachably securing the panel to the plate. The plate includes a retaining member secured thereon, the panel includes a peripheral flange extended laterally outward therefrom for engaging with the retaining member and for detachably securing the panel to the plate.
REFERENCES:
patent: 3108558 (1963-10-01), Galvin
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