Cutlery – Handles and blade connections – Shear or nipper type
Reexamination Certificate
2000-02-25
2001-07-17
Watts, Douglas D. (Department: 3724)
Cutlery
Handles and blade connections
Shear or nipper type
C030S125000, C030S193000
Reexamination Certificate
active
06260279
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention generally relates to a device for cutting workpieces, and more particularly to a device in the form of pliers, one plier arm carrying an interchangeable blade which, when moved towards the other plier arm, engages against an anvil of the other plier arm.
Such a device is disclosed in U.S. Pat. No. 5,673,487. The known plier-like device has a blade-holder which secures the blade by means of a jaw which can be unscrewed. In this jaw mount, the blade can rotate slightly so that it can come into linear abutment against the anvil. The blade can be exchanged for a spare blade which is to be stored in a separate spare-blade container.
SUMMARY OF THE INVENTION
One object of the present invention is to provide a device for cutting workpieces that has improved handling characteristics. Another object of the present invention is to provide such a device that is relatively simple and straight forward to manufacture and utilize. A further object of the present invention is to provide a device for cutting workpieces in the form of pliers wherein the spare blades can be stored in one plier arm of the device.
These and other objects, features and advantages of the present invention are provided by a device for cutting workpieces that includes a pair of plier arms pivotally movable relative to one another. Each plier arm of the device includes a handle section wherein the two handle sections are movable relative to one another in order to operate the device. Each plier arm also includes an operating-end section opposite the respective handle section. One of the operating-end sections has an interchangeable blade mounted thereon that engages or abuts against an anvil carried on the operating-end section of the other plier arm. One of the two handle sections forms a closed, but openable chamber for accommodating spare blades.
In one embodiment of the invention, the openable chamber is in a core part of the respective plier arm and is kept closed by a pivotable handle shell. The handle shell can have a U-shaped formation and can be pivoted outward. In one embodiment, the handle shell preferably pivots open in an outward direction from the core part. The handle shell can also be pivoted closed toward the core part by the user's hand.
In one embodiment, a pivot pin of the handle shell is mounted in the region of the pivot joint of the two plier arms, so that the chamber does not open during the normal, intended use of the tool.
In one embodiment, the handle shell which engages over the chamber is of a length that corresponds to the entire handle section.
In one embodiment the chamber has a rear through-passage opening, so that the spare blades can be removed more easily.
In one embodiment, the chamber has a depth that allows it to receive a multiplicity of spare blades.
In one embodiment, the two plier arms are preferably formed from a bent, punched sheet-metal core part and an injection molded handle section part. It is also possible for the two plier arms to be mounted to one another by a plastic material pin.
The two plier arms thus advantageously define a core part, and these each carry, on the handle section, a molded handle shell which may be of U-shaped configuration. The core parts and the handle shells are preferably connected to one another by a positive locking mechanism.
In another embodiment of the invention, the two plier arms can be locked to one another in their closed position. A latching means is provided for this purpose. The latching means is associated with a narrow side of the handle sections, on the pivot-point side. A locking member projects out of the narrow side of one handle section and can be positioned by pivoting or pushing against a latching shoulder of the other plier arm. The locking member is preferably on the plier arm that carries the anvil and can be actuated by the thumb of the operating hand.
In one embodiment of the tool according to the invention, one of the plier arms which is formed as a sheet-metal part, has an opening in a pivot or bearing region. The opening forms two cheeks so that the other plier arm can be inserted into the opening. Pins project laterally from the other plier arm and form bearing pins which can pass into openings associated with the cheeks. That section of the blade-carrying plier arm which is rotatably mounted within these cheeks forms the latching shoulder, so that latching can take place in a concealed position.
REFERENCES:
patent: 3772783 (1973-11-01), Averitt
patent: 3872591 (1975-03-01), Quenot
patent: 5625952 (1997-05-01), Thomas
patent: 5774991 (1998-07-01), Shi
patent: WO 90/11164 (1990-10-01), None
Apolinski Edmund
Daniels David
Ebert Winfried
Schiff & Hardin & Waite
Watts Douglas D.
Wolfcraft GmbH
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