Structure of cutter knife

• US 6,729,028 B1
• Filed: 12/24/2002
• Issued: 05/04/2004
• Est. Priority Date: 12/24/2002
• Status: Expired due to Fees

• Current Assignee: Cheng-Hui Hsu
• Original Assignee: Cheng-Hui Hsu
• Inventors: Hsu, Cheng-Hui
• Primary Examiner(s): PAYER, HWEI SIU CHOU
• Application Number:
  US10/327,009
• Time in Patent Office: 497 Days
• Field of Search: 301/42, 301/43, 301/62, 303/35, 711/8
• US Class Current: 30/143
• CPC Class Codes: B26B 1/044 by a spring tongue snapping behind or into the tang of the blade from a side part of the handle
• CPC Class Codes: B26B 1/046 with a locking member acting in axial direction parallel to the pivot axis of the blade
• CPC Class Codes: B26B 11/00 Hand knives combined with other implements, e.g. with corkscrew, with scissors, with writing implement combined table-ware A47G21/06
• CPC Class Codes: B26B 5/001 with blades being slid out of handle immediately prior to use

Abstract

The present invention discloses an improved structure of a cutter knife, comprising of a front casing, a rear casing, a front support pad, a rear support pad, a slider, a sliding bracket, a knife cartridge, a tail blade, a press button, a blade stopper, a stop block button and stopper button. Besides providing a convenient way of replacing the blades, the knife cartridge is capable of accommodating a plurality of spare blades, and the tail blade enhances the practicality and application of the cutter knife.

Claims

1. An improved structure of cutter knife, comprising of a front casing, a rear casing, a front support pad, a rear support pad, a slider, a knife cartridge, a tail blade, a press button, a blade stopper, a stop block button, and a stopper button;

wherein;

the front casing, being an integral casing plate, having a circular groove at the rear end of the front casing, and a plurality of latch holes being disposed at the rear section of the front casing, and the front casing at its middle section having a positioning hole, and the positioning hole on both of its inner sides having a rectangular groove, furthermore the front casing at the middle section of its inner side having a fixed screw hole, and the front casing at the upper edge of the rear section of its inner side having a circular protruded axle, and the protruded axle at its edge having a positioning sliding rod with a diameter smaller than the protruded axle, and the front casing at the rear end of its inner side having a fixed screw hole in the shape of a rod, and the front casing at the inner side of the upper edge of its front section having a wavy stop block groove;

the rear casing, being an integral casing plate, having a circular hole at the rear end of the rear casing, and the rear casing at its rear section having a plurality of latch holes, and the rear casing at its middle section having a circular hole, and furthermore, the rear casing at the inner side of the top at its rear end having a positioning axle protruded inward, and the rear casing at the bottom of its middle section having a fixed groove;

the front support pad, being integrally made of a soft plastic material, having a circular hole disposed at its rear, and the front support pad at the periphery of its inner side having a plurality of latch protrusions;

the rear support pad, being integrally made of a soft plastic material, having a plurality of latch protrusions on the periphery of its inner side;

the slider, being integrally bent and formed from a metal plate, having a circular hole each on both sides of its upper edge, and furthermore, the slider at its lower edge having an aslant bent plate, and the tail end of the aslant bent plate at its inner side having a latch protrusion;

the knife cartridge, being an integral cartridge substantially in the shape of a hollow trapezoid casing, and an axle hole at the top of its tail section;

the press button, being an integral hollow cylinder, having a circular hole groove at the middle section of one of its sides, and the press button at a side of its bottom having a sheath ring protruded from a side of its bottom and a protruded pillar on the other side;

the tail blade, having an axle hole at the middle section of one of its end, and the tail blade at its bottom having a vertical surface, and the tail blade at the upper edge of its rear section having a through latch hole;

the blade stopper further comprising a blade base, a push button, and a blade replacing switch, wherein;

the push button having a long rectangular embedding plate, and the embedding plate at its middle section having an arc embedding member, and the push button at its lower section having a vertical support pillar, and the push button at a side of its middle section having a circular protruded pillar, and the embedding plate at its front edge of the lower section having a protruded pillar, and the push button having a soft lining wrapped around its upper section;

the blade replacing switch, having a semicircular latch protrusion at a side of the bottom edge of its front end, and the blade switching switch at the middle section of its upper edge having a circular protruded pillar, and the blade switching button at a side of its tail end having a support axle;

the blade base, having a T-shaped embedding plate at the upper edge of its front end, and an embedding plate at the lower edge, and the embedding plate at its rear section having a latch groove, and the blade base at its middle section having a rectangular hole groove, and furthermore the blade base at the upper edge of the tail having a semicircular support axle hole;

the blade stopper latching a side of its tail to the support axle at the semicircular support axle hole at the upper edge of the tail of the blade base, and the push button using the protruded pillar thereof and the circular protruded pillar protruded from the middle section of the blade replacing switch sleeving and latching a spring, and furthermore the vertical support pillar at the lower section of the push button sleeving and latching a spring, and then latching into the rectangular hole groove of the blade base, and a blade using a semicircular latch groove of the blade to embed and fix the latch protrusion on a side of the bottom of the front end of the blade replacing switch to constitute a blade stopper;

the stop block button, being in the shape of a circular rod, having a rectangular support sliding member on each of both sides of its end, and the stop block button at the top of one of its ends having a rectangular latch protrusion, and furthermore, the stop block button at the middle section of its end having circular protruded pillar;

by means of the circular protruded pillar on a side of the push button of the blade stopper to latch and fix the inner side of the upper edge of the front section of the front casing into the wavy stop block groove, and the stopper button being latched to the upper edge of the front section of the front casing, and the stop block button being disposed into the positioning hole at the inner side of the middle section of the front casing, and the circular protruded pillar at an end sleeving a spring, and the blade cartridge latching the axle hole to the protruded axle at the upper edge of the rear section of the inner side of the front casing, and the press button using a sheath ring to sleeve the positioning sliding rod at the rear section of the inner side of the front casing, and in the circular groove at the rear end of the front casing and the tail blade using the axle hole at the end section to couple with the rod around the fixed screw hole at the rear end of the inner side of the front casing;

furthermore, the slider using two screws to couple the circular hole on both sides of the upper edge therof and secure a screw hole at the upper edge of the inner side of the rear section of the rear casing with the screws, such that the rear casing and the front casing being mutually aligned and engaged, and two screws being individually secured into the circular holes on the rear casing respectively, and the rear support pad using the plurality of latch protrusions on the periphery of the inner side thereof to embed and attach the plurality of latch holes at the rear section of the rear casing, and the front support pad using the plurality of latch protrusions to embed and attach the plurality of latch holes at the rear section of the front casing to constitute an integral structure of the cutter knife.