Utility knife

Abstract

A utility knife includes a housing, a cutter blade magazine and a push block. The housing has an accommodation chamber, a protruding portion, and an opening for insertion of the cutter blade magazine into the accommodation chamber of the housing. The cutter blade magazine has a cutter blade chamber accommodating a number of cutter blades, a sliding slot, an outlet, a through hole for receiving the protruding portion of the housing, and a stop portion. The push block has a flexible arm, which is stopped by the stop portion of cutter blade magazine to prohibit displacement of the push block relative to the cutter blade magazine after separation of the cutter blade magazine from the housing and which is deformed by the protruding portion of the housing for allowing movement of the push block relative to the cutter blade magazine after insertion of the cutter blade magazine into the accommodation chamber of the housing.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view of a utility knife in accordance with a first embodiment of the present invention.

FIG. 2 is a top view of the utility knife in accordance with the first embodiment of the present invention.

FIG. 3 is a side view of the utility knife in accordance with the first embodiment of the present invention.

FIG. 4 is a schematic drawing showing the action of the cutter blade magazine of the utility knife in accordance with the first embodiment of the present invention.

FIG. 5 is a front view of the cutter blade magazine of the utility knife in accordance with the first embodiment of the present invention.

FIG. 6 is a front view of a utility knife in accordance with a second embodiment of the present invention.

FIG. 7 is a top view of a utility knife in accordance with the second embodiment of the present invention.

FIG. 8 is a schematic drawing of the second embodiment of the present invention, illustrating the utility knife in action.

FIG. 9 is a top view of the cutter blade magazine of the utility knife in accordance with the second embodiment of the present invention.

FIG. 10 is a top view of a utility knife in accordance with a third embodiment of the present invention.

Claims

1. A utility knife comprising: a housing having an accommodation chamber, at least one protruding portion extending from an inside wall thereof, and an opening in communication between said accommodation chamber and the space outside said housing;a cutter blade magazine inserted through said opening into said accommodation chamber of said housing, said cutter blade magazine having a cutter blade chamber, a sliding slot in communication between said cutter blade chamber and the space outside said cutter blade magazine, an outlet in communication between said cutter blade chamber and said accommodation chamber of said housing, a through hole in communication between said cutter blade chamber and said accommodation chamber of said housing for receiving said at least one protruding portion of said housing, and a stop portion provided on an inside wall thereof; anda push block having a block body movably positioned in said cutter blade chamber of said cutter blade magazine, a control knob extending from said block body and received in said sliding slot of said cutter blade magazine, a support arm extending from said block body, at least one locating rod laterally extending from said support arm, and a flexible arm extending from said block body;wherein said flexible arm is deformed by said at least one protruding portion of said housing such that said flexible arm is disengaged from said stop portion of said cutter blade magazine for allowing movement of said push block relative to said cutter blade magazine;wherein said flexible arm is stopped by said stop portion of said cutter blade magazine to prohibit movement of said push block relative to said cutter blade magazine when said cutter blade magazine is separated from said housing.

2. The utility knife as claimed in claim 1, further comprising a spring member mounted on said inside wall of said cutter blade magazine.

3. The utility knife as claimed in claim 1, wherein said stop portion of said cutter blade magazine is formed by a periphery of said through hole.

4. The utility knife as claimed in claim 1, wherein said stop portion of said cutter blade magazine is a rib.

5. The utility knife as claimed in claim 4, wherein said rib has a beveled face.

6. The utility knife as claimed in claim 1, wherein the flexible arm of said push block has a beveled face on a rear end thereof.