Adjustable blade utility knife

Abstract

An adjustable blade utility knife having a hollow body comprising two hinged body parts, a blade system for extending a four cutting edged blade, and a knurled knob mounted on opposite sides of the body for controlling the blade system with a finger of either hand of an operator. A second embodiment contains serrated edges. The blade may be manufactured using a refractory hard metal or cemented carbides. A blade storage area is formed inside the body.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1, 1a, 2 and 2a are opposite elevational views of the invention.

FIG. 2 b is a side elevational view of the invention showing the maximum angle/depth of penetration.

FIG. 3 is a side elevational view of blades used in the utility knife of the invention.

FIGS. 4 and 5 are isometric views of the invention.

Claims

1. An adjustable blade utility knife in which a blade can be extended and returned so as to expose only the length of blade required, said utility knife comprising: a hollow body having a first body side and a second body side, each side being longitudinally matched to the opposite half and pivotally attached together at a first end,locking means for keeping said two body sides in position, said locking means having a snap catch positioned within said first body side in communication with a tongue positioned in said second body side, said first and second body sides having a protrusion formed at a first end for protecting a user from an opposite cutting surface not in use,a blade mechanism slidably mounted within said hollow body for extending a blade, said blade mechanism having a blade carriage system and having blade fitting pins located on a first end and a return spring attached to a second end,a blade having four cutting edges mounted on said blade fitting pins, said blade having identification numbers imprinted on each cutting edge, and,a first knurled pad mounted on a first side and a second knurled pad mounted on a second side of said blade carriage system for controlling the extension of said blade carriage system with a finger of either hand of an operator.

3. An adjustable blade utility knife of claim 1 wherein a blade storage area is formed in said first body side and a spring clip being attached for holding spare blades in place.

4. An adjustable blade utility knife of claim 1 wherein said blade is made from refractory hard metals.

5. An adjustable blade utility knife of claim 1 wherein said blade is made of a material selected from a group consisting of refractory hard metals and cemented carbides.

6. An adjustable blade utility knife of claim 1 wherein said blade is made from a group of materials known as cemented carbides.

7. An adjustable blade utility knife of claim 1 wherein said blade is made with serrated cutting edges.