WO1999031991A1 - A cutting blade - Google Patents
A cutting blade Download PDFInfo
- Publication number
- WO1999031991A1 WO1999031991A1 PCT/NZ1998/000183 NZ9800183W WO9931991A1 WO 1999031991 A1 WO1999031991 A1 WO 1999031991A1 NZ 9800183 W NZ9800183 W NZ 9800183W WO 9931991 A1 WO9931991 A1 WO 9931991A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- blade
- cutting blade
- cutting
- insert
- docile
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B9/00—Blades for hand knives
-
- A—HUMAN NECESSITIES
- A22—BUTCHERING; MEAT TREATMENT; PROCESSING POULTRY OR FISH
- A22B—SLAUGHTERING
- A22B3/00—Slaughtering or stunning
- A22B3/10—Slaughtering tools; Slaughtering knives
Definitions
- the present invention relates to a cutting blade but more particularly a blade for a knife as used in animal carcass processing subsequent to slaughter.
- a sharp knife In the course of animal slaughter and carcass processing many of the operations are still performed by hand with the aid of a sharp knife.
- the use of a knife with a sharp tip has several disadvantages when used in certain operations. For example, when removing the pelt by cutting up the underside of the animal a sharp tip can score the carcass (through a protective membrane) and often result in the carcass being downgraded. Damaging the pelt, which goes on for further processing, also results in downgrading.
- a sharp knife in the hands of an unskilled worker, can lead to inaccuracy as the knife may easily wander and cut into unintended areas.
- the use of a sharp knife requires experience and a * feel' for the knife as it moves into the animal as often the knife point will be out of sight.
- a knife once removed from the animal must be sterilised in order to restart a cut which results in the process taking longer than should be necessary.
- a cutting blade including a cutting edge wherein an insert portion of docile material is embedded or inserted into said cutting edge such that the insert portion will not take a sharpened edge .
- the portion of docile material will conform to the contour of the blade during a sharpening process .
- Figure 1 illustrates a general view of a knife having a cutting blade according to one embodiment of the present invention
- Figure 2 is a view of the cutting blade before the docile material is inserted.
- the knife 10 is comprised of a handle 11, an upwardly curving blade 12 and a cutting edge 13.
- the embedded docile material is provided (in this preferred embodiment) in the form of an insert 14 located at the distal end of the cutting edge 13.
- a 'docile' material will not take on a cutting edge when sharpened in conjunction with the cutting edge 13 and effectively remains blunt while still maintaining the contour of the blade 12.
- the insert 14 occupies approximately 10% of the total blade length from the tip.
- the knife 10 of the present invention can be used for operations such as removing the viscera where the distal end of the knife must not puncture the internal organs .
- the streamlined albeit blunt knife point 14 is capable of entering the carcass (by a stabbing action) , but once inside the animal the blunt tip will not puncture the stomach or other internal organs thereby preventing contamination of the carcass. It is not uncommon for organs to be punctured by sharp knives when in the hands of less experienced workers.
- the insert 14 When maintaining the blade 12, ie . sharpening, the insert 14 will wear away consistently with the cutting edge 13 and thereby provide uniform performance throughout the useable life of the knife. As opposed to alternatives (such as knives blunted by virtue of a ball bearing) the knife can also be sharpened to its required contour with a sharpening stone or grinder by the operator.
- Insert 14 (formed from an appropriate docile material) is preferably inserted into the required position on blade 12 by a simple and cost-effective process.
- a basic method of producing a knife according to the present invention is hereinafter described.
- the first step in producing the enhanced knife blade is removing a portion of metal from the blade which is to be replaced.
- the profile of the blade with metal removed is best illustrated by Figure 2. In the preferred embodiment this means removing a (approx.) 10mm notch from the tip of the blade .
- the pointed tip of the cutting blade must also be removed (as seen in Figure 2) so that during sharpening the hardened metal point of the cutting blade 12 is not uncovered. This would render the function of the docile material ineffective as the blade would have a sharp tip to puncture organs .
- the notch or cavity 14a is thus ground into the blade preferably of a shape which will allow the insert 14 portion to be permanently retained in the blade once in place .
- the 'notch' 14a may be formed by drilling into the cutting blade so as to provide a retention means for docile material at the tip.
- Flux is then applied to the exposed cavity 14a portion of the blade and it is immersed in the molten form of the docile material (generally a metal or alloy) .
- the molten docile metal may be retained in a recess in a fire brick proportionate to the modified area of blade (plus an excess) .
- the blade with the new docile metal insert 14 is removed from the brick when the docile metal has sufficiently solidified.
- the blade may be reheated to blue and then crash cooled in oil.
- the resulting 'composite' blade is not welded (ie. the metal is not blended) but is held together by virtue of the insert shape within the blade and the surrounding docile metal.
- the critical heating steps performed on the blade are preferably conducted in one systematic operation to ensure a consistent result.
- the insert 14 may then be worked to the required shape to conform with the cutting edge 13.
- GTAW or "TIG” welder
- the TIG welder may be used as a heat source to melt the docile metal and place it into the cavity 14a (within the recess of an aluminium block) .
- the high concentrated temperatures involved are thought to cause some absorption of the docile metal into the blade.
- the subsequent bond is very strong (more so than the previous method described) .
- Insert 14 is preferably in the form of bronze, nickel or silphos which are metal alloys with known docile properties and also have sufficient durability to provide a product with a reasonable service life.
- the insert 14 is preferably a docile metal or alloy as described above but other materials may be suitable or become available which will provide the required properties to work the invention as it is intended.
- the blunted portion of blade 12 represented by insert 14 is a relatively small section of the cutting edge. It is this critical tip portion which leads the knife in its cutting operations and hence previously had the most potential to cut into unintended parts of the animal causing quality to suffer.
- the blunt insert 14 portion allows the point of the knife to follow a membrane layer without cutting through it and therefore avoids damage when separating the layers .
- the knife 10 of the present invention is quite suited to following the contours of individual animals (which may include scar tissue) and their different body shapes and fat layers while in the hands of a less skilled operator.
- the knife according to the present invention allows more accurate and efficient sectional removal at particular portions of the animal's skin pelt and internal organs.
- the knife enhances the quality of lead up work to the robotics which generally complete processing by providing the ability to clear stress points which cause pelts to stretch and are then downgraded considerably.
- the broad concept of replacing a portion of the cutting edge with a blunt portion can be applied to any section of the blade.
- Further embodiments include knives with docile inserts (of a form substantially similar to insert 14) which are positioned midway along the cutting edge 12. Blades of this type are suited to specialist operations such as when a long knife is required but only the leading portion is required to cut. An insert of the type described located midway along the blade thereby acts as a depth guide and the blunt portion prevents damage to unintended areas .
- Inserts of varying thickness which still conform to the general contour of the blade are also possible for adaptation to different end uses and personal preferences.
- a knife 10 of the type illustrated in the drawings is intended for the specialised operations involved in commercially processing animal carcasses but it will be appreciated that the invention can be applied to other uses without departing from the scope of the invention as it is intended. Such other uses include recreational hunting or fishing.
- the knife of the present invention can be utilised by unskilled labour (relative to previous requirements where an experienced worker was employed who had a good 'feel' for specific cuts) and still minimise or eliminate damage to either the pelt skin or carcass.
- the cutting blade of the present invention is multifunctional and a worker does not require a number of specialised knives for different cuts.
- the cutting blade of the present invention may be used for 'flaying' cuts which are not possible when using a ballbearing tipped blade.
- tip performance does not alter during the constant sharpening operations the knife blade must undergo in use .
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Forests & Forestry (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Knives (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU18930/99A AU733437B2 (en) | 1997-12-23 | 1998-12-17 | A cutting blade |
NZ505277A NZ505277A (en) | 1997-12-23 | 1998-12-17 | A cutting blade with a dulled insert of docile material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NZ329483 | 1997-12-23 | ||
NZ32948397 | 1997-12-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999031991A1 true WO1999031991A1 (en) | 1999-07-01 |
Family
ID=19926571
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NZ1998/000183 WO1999031991A1 (en) | 1997-12-23 | 1998-12-17 | A cutting blade |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU733437B2 (en) |
WO (1) | WO1999031991A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110496977A (en) * | 2019-09-04 | 2019-11-26 | 浙江郑氏刀剑有限公司 | A kind of Split type cutter and its preparation process |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1477510A (en) * | 1922-10-28 | 1923-12-11 | Martin David | Skinning knife |
FR2354177A1 (en) * | 1976-06-09 | 1978-01-06 | Guitard Laurent | Knife for cutting car seat belt in event of accident - has blade of cruciform section with four cutting edges and soft rounded tip |
US4290201A (en) * | 1979-09-12 | 1981-09-22 | Joseph Goodwin | Field dressing device |
US4763416A (en) * | 1987-05-26 | 1988-08-16 | Copeland W Duane | Field dressing attachment for hunting knife |
US4937941A (en) * | 1989-09-29 | 1990-07-03 | Crist Gerald L | Adapter to convert a knife into a skinning tool |
-
1998
- 1998-12-17 AU AU18930/99A patent/AU733437B2/en not_active Ceased
- 1998-12-17 WO PCT/NZ1998/000183 patent/WO1999031991A1/en active IP Right Grant
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1477510A (en) * | 1922-10-28 | 1923-12-11 | Martin David | Skinning knife |
FR2354177A1 (en) * | 1976-06-09 | 1978-01-06 | Guitard Laurent | Knife for cutting car seat belt in event of accident - has blade of cruciform section with four cutting edges and soft rounded tip |
US4290201A (en) * | 1979-09-12 | 1981-09-22 | Joseph Goodwin | Field dressing device |
US4763416A (en) * | 1987-05-26 | 1988-08-16 | Copeland W Duane | Field dressing attachment for hunting knife |
US4937941A (en) * | 1989-09-29 | 1990-07-03 | Crist Gerald L | Adapter to convert a knife into a skinning tool |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110496977A (en) * | 2019-09-04 | 2019-11-26 | 浙江郑氏刀剑有限公司 | A kind of Split type cutter and its preparation process |
Also Published As
Publication number | Publication date |
---|---|
AU1893099A (en) | 1999-07-12 |
AU733437B2 (en) | 2001-05-17 |
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