Package open knife and a package open knives pack

Patent metadata

Field	Value
Publication number	US-11801611-B2
Application number	US-201917612722-A
Country	US
Kind code	B2
Filing date	Aug 22, 2019
Priority date	Jun 28, 2019
Publication date	Oct 31, 2023
Grant date	Oct 31, 2023

Abstract

A package opening knife has a body part, a blade part, a gripping part that extends in an elongated shape in a prescribed first direction, and a guide part provided with a guide surface that slides in a surface direction of the package in a state of contacting the package to guide movement of the blade part. When a surface direction of the guide is defined as a second direction, the first direction and the second direction become substantially parallel to each other.

First claim

The invention claimed is:

1. A package open knife to cut and open a package that houses containment, comprising:
a main body, a blade portion attached to the main body, a grip portion provided with the main body to elongatedly extend in a predetermined first direction and a guide portion,
the guide portion having a guide face to guide the movement of the blade portion by sliding in a face extending direction of the package in a state to face-contact with the package during the cutting operation of the package by the user holding the grip portion, wherein both a predetermined cutting depth and a predetermined cutting angle of the blade portion to the package are maintained,
wherein the blade portion is embedded to the main body to project from the front side of the main body by the predetermined amount obliquely in the first direction and the blade portion includes a blade edge to cut the package in the draw-cutting direction defined by a direction from the blade portion to the grip portion,
wherein, when the face extending direction of the guide face is defined as a second direction, the second direction is provided to be parallel with the first direction,
the grip portion is provided with a length in the first direction configured to be held substantially entirely by a palm of a user's hand, the grip portion having a rib portion at the outer edge of the grip portion and a concave portion provided at the inside of the rib portion,
the concave portion includes a finger placing face on which at least the thumb and the index finger of the user holding the grip portion can be placed,
the grip portion includes finger engaging portions in a direction to cross the draw-cutting direction to apply the finger force of the user holding the grip portion during the cutting operation in the draw-cutting direction,
the finger engaging portions include, at the front side of the grip portion, an inclined engaging portion obliquely inclined to the first direction to engage with the thumb or index finger of the user and a concave engaging portion to dent in a direction to cross the longitudinal direction to engage with the index finger or the middle finger of the user, and at the rear side of the grip portion, a projected engaging portion projecting in a direction to cross the longitudinal direction to engage with the ring finger or the little finger of the user;
wherein the guide portion is disposed between the blade portion and the grip portion,
wherein an obtuse angle is provided between the blade portion extending direction and the grip portion extending direction,
the package open knife further comprising:
a connecting region at the main body between the blade portion and the grip portion to connect the blade portion and the grip portion by extending in a direction to cross with the first direction, and
a contact avoiding region, provided in part by a space formed by the connecting region, to avoid the contact of the finger of the user holding the grip portion with the package during the cutting operation of the package by the blade portion.

2. A package open knives pack in which a plurality of package open knives are accommodated,
wherein each package open knife includes
a main body, a blade portion attached to the main body, a grip portion provided with the main body to elongatedly extend in a predetermined first direction and a guide portion,
the guide portion having a guide face to guide the movement of the blade portion by sliding in a face extending direction of the package in a state to face-contact with the package during the cutting operation of the package by the user holding the grip portion, wherein both a predetermined cutting depth and a predetermined cutting angle of the blade portion to the package are maintained,
wherein the blade portion is embedded to the main body to project from the front side of the main body by the predetermined amount obliquely in the first direction and the blade portion includes a blade edge to cut the package in the draw-cutting direction defined by a direction from the blade portion to the grip portion,
wherein, when the face extending direction of the guide face is defined as a second direction, the second direction is provided to be parallel with the first direction,
the grip portion is provided with a length in the first direction configured to be held substantially entirely by a palm of a user's hand, the grip portion having a rib portion at the outer edge of the grip portion and a concave portion provided at the inside of the rib portion,
the concave portion includes a finger placing face on which at least the thumb and the index finger of the user holding the grip portion can be placed,
the grip portion includes finger engaging portions in a direction to cross the draw-cutting direction to apply the finger force of the user holding the grip portion during the cutting operation in the draw-cutting direction,
the finger engaging portions include, at the front side of the grip portion, an inclined engaging portion obliquely inclined to the first direction to engage with the thumb or index finger of the user and a concave engaging portion to dent in a direction to cross the longitudinal direction to engage with the index finger or the middle finger of the user, and at the rear side of the grip portion, a projected engaging portion projecting in a direction to cross the longitudinal direction to engage with the ring finger or the little finger of the user;
wherein the guide portion is disposed between the blade portion and the grip portion,
and wherein each of the accommodated package open knives is provided with an identifier to identify to each other,
the identifier is defined by the coloring portion provided at the main body of each package open knife.

Assignees

• Kai R&D Center Co Ltd

Inventors

• SUMI Kazuomi
• Ochiai Shogo
• Hara Kazunobu

Classifications

• B26B27/005 Primary

  Carton openers · CPC title

• B25G1/102

  the shape being specially adapted to facilitate handling or improve grip · CPC title

• B65B69/0033

  by cutting (B65B69/0008-B65B69/0025 take precedence) · CPC title

• B26B3/08

  specially adapted for cutting cardboard, or wall, floor, or like covering materials · CPC title