EP0395338A1 - A snap-off blade knife - Google Patents
A snap-off blade knife Download PDFInfo
- Publication number
- EP0395338A1 EP0395338A1 EP19900304343 EP90304343A EP0395338A1 EP 0395338 A1 EP0395338 A1 EP 0395338A1 EP 19900304343 EP19900304343 EP 19900304343 EP 90304343 A EP90304343 A EP 90304343A EP 0395338 A1 EP0395338 A1 EP 0395338A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- blade
- handle
- knife
- recess
- snap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
- B26B5/00—Hand knives with one or more detachable blades
- B26B5/001—Hand knives with one or more detachable blades with blades being slid out of handle immediately prior to use
- B26B5/002—Hand knives with one or more detachable blades with blades being slid out of handle immediately prior to use segmented blades
Definitions
- This invention relates to a snap-off blade knife.
- a known snap-off blade knife comprises a handle made in at least two parts which assemble together for normal use of the knife, a first said part carrying a snap-off blade and a slider connected to the blade for protruding the blade from one end of said first part, said end forming a front end of the handle, one surface only of the blade having break-lines which are obtusely-angled relative to the cutting edge of the blade, a second said part being detachable from the first said part and being adapted for use in snapping-off a used blade-end portion, the second said part being formed with a slot to receive the used blade-end portion protruding from the front end of the handle.
- the blade-end portion must be bent downwardly if that surface is uppermost or, conversely, must be bent upwardly if that surface is lowermost, since otherwise the blade will fracture uncontrollably and with possibly dangerous results.
- the invention provides a snap-off blade knife as claimed in each of the claims, to which reference is directed.
- a first embodiment of the invention in the form of a snap-off blade knife 10 which comprises a handle 12 made in two parts 14, 16 which assemble together for normal use of the knife 10.
- the first said part 12 carries a conventional snap-off blade 18 and a conventional slider 20 connected to the blade 18 for protruding the blade 18 from one end 22 of said first part 12. This end 22 forms a front end of the handle 12.
- one surface 24 only (that is, not the opposite surface) of the blade 18 has break-lines 26 which are obtusely-angled relative to the cutting edge of the blade 18. This surface 24 faces the slider 20.
- the second part 16 of handle 12 is detachable from the first said part 14 and is adapted for use in snapping-off a used blade-end portion 28. More particularly, the second said part 16 is formed with a recess 30 at the rear end 32 of handle 12, and is also formed with a slot 34 within the recess 32 to receive the used blade-end portion 28 protruding from the front end 22 of the handle 12.
- the blade-end portion 28 must be bent downwardly if that surface 24 is uppermost or, conversely, must be bent upwardly if that surface 24 is lowermost, since otherwise the blade 18 will fracture uncontrollably and with possibly dangerous results.
- the slot 34 is shaped to receive the used blade-end portion 28 properly one way round but not the opposite way round, whilst the recess 30 is shaped to allow relative deflection of said first and second parts 14, 16 of the handle 12, for snapping-off the used blade-end portion 28, in one direction, corresponding to the blade surface 24 having the break-lines 26, but not the opposite direction.
- the slot 34 has a bottom edge 36 which is angled the same way as the break-lines 26. Also, the recess 30 has a bottom surface 38 at the same angle, to engage a similarly angled surface 40 at the front end 22 of handle part 14.
- the recess 30 has two surfaces 42, 44 which are at different angles as shown clearly in Figs. 3 and 5.
- the recess surface 42 abuts a surface 46 (Fig. 3) on the corresponding side of the handle end 22 - namely, the side of the slider 20, as shown in Fig. 5 - and inhibits or discourages relative bending of the handle parts 14,16 in that direction.
- the recess surface 44 is spaced from the corresponding surface 48 of the handle end 22 (on the far side from the slider 20) and permits relative bending of the handle parts 14, 16 in that direction, indicated by arrows 50, 52 in Fig. 5.
- Fig. 6 shows how handle part 14 (the same as in Figs. 1 to 5) conventionally engages handle part 16A.
- Handle part 14 has two walls 54, 56 which are formed with conventional detent teeth 58, 60 on their respective inside surfaces, to conventionally engage the slider 20. Cutouts 62, 64 slidingly accommodate walls 66, 68 of handle part 16A. Walls 66, 68 are overhung or undercut to receive flanges 70, 72 of handle part 14, as shown in Fig. 6. (Handle parts 14, 16 of the first embodiment of Figs. 1 to 5 are assembled in the same way, not shown. )
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Forests & Forestry (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Knives (AREA)
Abstract
A detachable rear-end handle part (16) of a snap-off blade knife has a recess (30) and slot (34) which engage the front end (22) of a front handle part (14) and a used blade end-portion (28) only one way round and which, by virtue of different angles of recess walls (42, 44), allow only one direction of relative bending of handle parts (14, 16) to break-off the blade end-portion (28), corresponding to the side of the single blade surface (24) formed with the break-lines (26). Hence the blade is always bent the right way.
Description
- This invention relates to a snap-off blade knife.
- A known snap-off blade knife comprises a handle made in at least two parts which assemble together for normal use of the knife, a first said part carrying a snap-off blade and a slider connected to the blade for protruding the blade from one end of said first part, said end forming a front end of the handle, one surface only of the blade having break-lines which are obtusely-angled relative to the cutting edge of the blade, a second said part being detachable from the first said part and being adapted for use in snapping-off a used blade-end portion, the second said part being formed with a slot to receive the used blade-end portion protruding from the front end of the handle.
- Because the break-lines are formed only on the one surface of the blade, the blade-end portion must be bent downwardly if that surface is uppermost or, conversely, must be bent upwardly if that surface is lowermost, since otherwise the blade will fracture uncontrollably and with possibly dangerous results.
- It is an object of the invention to provide a snap-off blade knife designed to encourage proper breakage, and discourage improper breakage, of used blade-end portions from the blade.
- The invention provides a snap-off blade knife as claimed in each of the claims, to which reference is directed.
- The invention will be described by way of example with reference to the drawings, wherein: -
- Figs. 1 to 4 illustrate a knife forming a first embodiment of the invention, being respectively back and front elevations, a plan view (including a section on III-III of Fig. 2) and a rear end view of the knife;
- Fig. 5 illustrates the knife of Figs. 1 to 4, showing a blade-end portion about to be broken off;
- Fig. 6 illustrates a modified knife, with the handle parts separated;
- Figs. 7 and 8 are sections on VII-VII and on VIII-VIII respectively in Fig. 6; and
- Fig. 9 illustrates the knife of Figs. 6 to 8, showing a blade end portion about to be broken off.
- Referring to Figs. 1 to 5, there is illustrated a first embodiment of the invention, in the form of a snap-off
blade knife 10 which comprises ahandle 12 made in twoparts knife 10. - The first said
part 12 carries a conventional snap-offblade 18 and aconventional slider 20 connected to theblade 18 for protruding theblade 18 from oneend 22 of saidfirst part 12. Thisend 22 forms a front end of thehandle 12. - As usual, one surface 24 only (that is, not the opposite surface) of the
blade 18 has break-lines 26 which are obtusely-angled relative to the cutting edge of theblade 18. This surface 24 faces theslider 20. - The
second part 16 ofhandle 12 is detachable from the first saidpart 14 and is adapted for use in snapping-off a used blade-end portion 28. More particularly, the second saidpart 16 is formed with arecess 30 at therear end 32 ofhandle 12, and is also formed with aslot 34 within therecess 32 to receive the used blade-end portion 28 protruding from thefront end 22 of thehandle 12. - Because the break-
lines 26 are formed only on the one surface 24 of the blade 18 (i.e. the surface facing slider 20), and are not formed on the other surface, the blade-end portion 28 must be bent downwardly if that surface 24 is uppermost or, conversely, must be bent upwardly if that surface 24 is lowermost, since otherwise theblade 18 will fracture uncontrollably and with possibly dangerous results. - Accordingly, the
slot 34 is shaped to receive the used blade-end portion 28 properly one way round but not the opposite way round, whilst therecess 30 is shaped to allow relative deflection of said first andsecond parts handle 12, for snapping-off the used blade-end portion 28, in one direction, corresponding to the blade surface 24 having the break-lines 26, but not the opposite direction. - More particularly, the
slot 34 has abottom edge 36 which is angled the same way as the break-lines 26. Also, therecess 30 has abottom surface 38 at the same angle, to engage a similarlyangled surface 40 at thefront end 22 ofhandle part 14. - The
recess 30 has twosurfaces end 22 and used blade-end portion 28 are respectively inserted the correct way round inrecess 30 and inslot 34, therecess surface 42 abuts a surface 46 (Fig. 3) on the corresponding side of thehandle end 22
- namely, the side of theslider 20, as shown in Fig. 5
- and inhibits or discourages relative bending of thehandle parts recess surface 44 is spaced from thecorresponding surface 48 of the handle end 22 (on the far side from the slider 20) and permits relative bending of thehandle parts lines 26 faces the same way as slider 20 - downwardly in Fig. 5 - relative bvending ofhandle parts lines 26 and achieves a clean break. - The only difference in the second embodiment of Figs. 6 to 9 is that the
recess 30A andslot 34A are in the side instead of the end ofhandle part 16A, with corresponding change in the relative orientation ofhandle parts - Fig. 6 shows how handle part 14 (the same as in Figs. 1 to 5) conventionally engages handle
part 16A. Handlepart 14 has twowalls detent teeth slider 20.Cutouts walls handle part 16A.Walls flanges handle part 14, as shown in Fig. 6. (Handle parts
Claims (4)
1. A snap-off blade knife (10), comprising a handle (12) made in at least two parts (14, 16) which assemble together for normal use of the knife, a first said part (12) carrying a snap-off blade (18) and a slider (20) connected to the blade (18) for protruding the blade (18) from one end (22) of said first part, said end (22) forming a front end of the handle (12), one surface (24) only of the blade (18) having break-lines (26) which are obtusely-angled relative to the cutting edge of the blade (18), a second said part (16) being detachable from the first said part (14) and being adapted for use in snapping-off a used blade-end portion (28), the second said part (16) being formed with a recess (30) to receive the front end (22) of the handle (12) and a slot (34) within the recess (30) to receive the used blade-end portion (28) protruding from the front end (22) of the handle (12), the slot (34) being shaped to receive the used blade-end portion (28) properly one way round but not the opposite way round, the recess (30) being shaped to allow relative deflection of said first and second parts (14, 16) of the handle (12), for snapping-off the used blade-end portion (28), in one direction, corresponding to the surface (24) of the blade (18) having the break-lines (26), but not the opposite direction.
2. A knife as claimed in claim 1, wherein the second part (16) forms an extension of the first part (14).
3. A knife as claimed in claim 2, wherein the recess (30) is in an end (32) of the second part (16).
4. A knife as claimed in claim 2, wherein the recess (30A) is in one side of the second part (16A).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB8909424A GB2230996B (en) | 1989-04-25 | 1989-04-25 | A snap-off blade knife |
GB8909424 | 1989-04-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0395338A1 true EP0395338A1 (en) | 1990-10-31 |
Family
ID=10655682
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900304343 Withdrawn EP0395338A1 (en) | 1989-04-25 | 1990-04-23 | A snap-off blade knife |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP0395338A1 (en) |
GB (1) | GB2230996B (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999052690A1 (en) * | 1998-04-09 | 1999-10-21 | Mary Kay Allen | Blade holster assembly |
GB2349841A (en) * | 1999-04-23 | 2000-11-15 | Moving Edge Ltd | Cutting tool |
US6364182B1 (en) | 1998-04-09 | 2002-04-02 | Mary Kay Hansen | Holster assembly with disposable blade well |
WO2009097501A1 (en) * | 2008-01-30 | 2009-08-06 | American Safety Razor Company | Snap-off knife |
US7966732B2 (en) | 2002-11-19 | 2011-06-28 | Spellbound Development Group, Inc. | Safety cutting apparatus |
EP2481533A1 (en) * | 2011-01-31 | 2012-08-01 | Olfa Corporation | Blade snap-off holder |
CN104191435A (en) * | 2014-08-20 | 2014-12-10 | 张家港市天华五金工具有限公司 | Art knife |
WO2017188984A1 (en) * | 2016-04-29 | 2017-11-02 | JR. Harry S. BILLADO | Utility knife with blade guide to separate detachable blade segments from a multi-point utility blade |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0449053U (en) * | 1990-08-29 | 1992-04-24 | ||
CN104014575A (en) * | 2014-02-27 | 2014-09-03 | 昆山洛博格机械技术咨询有限公司 | Blade break-off collector |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4240202A (en) * | 1977-09-08 | 1980-12-23 | Stanley Tools Limited | Replaceable blade knife |
DE8801417U1 (en) * | 1988-02-05 | 1988-04-21 | Schneider, Helmut, 7521 Hambrücken | Multiple cutting tool |
GB2206832A (en) * | 1987-07-15 | 1989-01-18 | Nippon Tenshashi Kk | A knife |
-
1989
- 1989-04-25 GB GB8909424A patent/GB2230996B/en not_active Expired - Fee Related
-
1990
- 1990-04-23 EP EP19900304343 patent/EP0395338A1/en not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4240202A (en) * | 1977-09-08 | 1980-12-23 | Stanley Tools Limited | Replaceable blade knife |
GB2206832A (en) * | 1987-07-15 | 1989-01-18 | Nippon Tenshashi Kk | A knife |
DE8801417U1 (en) * | 1988-02-05 | 1988-04-21 | Schneider, Helmut, 7521 Hambrücken | Multiple cutting tool |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1999052690A1 (en) * | 1998-04-09 | 1999-10-21 | Mary Kay Allen | Blade holster assembly |
US6105838A (en) * | 1998-04-09 | 2000-08-22 | Hansen; Mary Kay | Holster and blade well |
US6364182B1 (en) | 1998-04-09 | 2002-04-02 | Mary Kay Hansen | Holster assembly with disposable blade well |
GB2349841A (en) * | 1999-04-23 | 2000-11-15 | Moving Edge Ltd | Cutting tool |
GB2349841B (en) * | 1999-04-23 | 2003-08-27 | Moving Edge Ltd | Cutting tool |
US6718640B1 (en) | 1999-04-23 | 2004-04-13 | Moving Edge Limited | Cutting tool |
US7966732B2 (en) | 2002-11-19 | 2011-06-28 | Spellbound Development Group, Inc. | Safety cutting apparatus |
WO2009097501A1 (en) * | 2008-01-30 | 2009-08-06 | American Safety Razor Company | Snap-off knife |
EP2481533A1 (en) * | 2011-01-31 | 2012-08-01 | Olfa Corporation | Blade snap-off holder |
CN104191435A (en) * | 2014-08-20 | 2014-12-10 | 张家港市天华五金工具有限公司 | Art knife |
WO2017188984A1 (en) * | 2016-04-29 | 2017-11-02 | JR. Harry S. BILLADO | Utility knife with blade guide to separate detachable blade segments from a multi-point utility blade |
US20190329430A1 (en) * | 2016-04-29 | 2019-10-31 | Harry S. Billado, JR. | Utility Knife with Blade Guide to Separate Detachable Blade Segments From a Multi-Point Utility Blade |
Also Published As
Publication number | Publication date |
---|---|
GB2230996A (en) | 1990-11-07 |
GB8909424D0 (en) | 1989-06-14 |
GB2230996B (en) | 1993-02-17 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE |
|
16A | New documents despatched to applicant after publication of the search report | ||
17P | Request for examination filed |
Effective date: 19910429 |
|
17Q | First examination report despatched |
Effective date: 19930525 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN |
|
18D | Application deemed to be withdrawn |
Effective date: 19931101 |