Olfa Corporation

Yosuke Takashima

Minoru Masuda

Toshiyuki Watanabe

A safety cutter knife of the present disclosure includes a blade part that includes a blade, a guard attached to one end of the blade, and a head on which the blade is fixed and that has a cutting edge of the blade being exposed between the guard and the head, and a grip part that detachably holds the head in the state where the cutting edge of the blade and the guard in the blade part protrude.

Safety cutter knife

Replacement blade for a cutter knife

Cutter knife

The present invention provides a cutter knife, which even if made with only the metal parts, smoothness of sliding operation of the blade is not degraded in time, even without lubricating oil nor friction resistant coating, A slider of the cutter knife carries rolling member, which is made rolling contact with the outer surface of the cutter knife. Further, the slider has a protrusion which extends into the cutter knife body and is engaged into a hole formed on the blade. Since an external force applied onto the slider is received by the rolling member, the slider can be operated smoothly. Besides, the height of the protrusion is determined, such that the protrusion does not touch the inner surface of the cutter knife. Thus, the protrusion tip never interfere with the inner surface of the cutter knife, thereby the sliding operation of the slider would not be prevented.

Full metal cutter knife

Disclosed is a blade snap-off holder which enables a safe, easy and smooth operation for snapping off a blade tip of a cutter knife. The holder has an insertion opening on its wall. A tip of a knife blade inserted through the opening is received in a groove of a rotary member located inside the holder. The rotation axis of the rotary member extends substantially parallel to the score of the knife blade. When the rotary member is rotated and a bending force is applied to the tip of the knife blade, the blade tip received in the groove of the rotary member can be snapped off. A user only grasps this holder in one hand and rotates the operation lever with a finger, and then a blade tip can be snapped off cleanly and easily without any subtle control of a force.

Growing community of inventors

Osaka, Japan

Yosuke Takashima