EP1987916A1 - A grinding machine and a grinding jig therefore - Google Patents
A grinding machine and a grinding jig therefore Download PDFInfo
- Publication number
- EP1987916A1 EP1987916A1 EP08155316A EP08155316A EP1987916A1 EP 1987916 A1 EP1987916 A1 EP 1987916A1 EP 08155316 A EP08155316 A EP 08155316A EP 08155316 A EP08155316 A EP 08155316A EP 1987916 A1 EP1987916 A1 EP 1987916A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- grinding
- tool
- jig
- base
- clamp
- 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.)
- Granted
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B3/00—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools
- B24B3/36—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B41/00—Component parts such as frames, beds, carriages, headstocks
- B24B41/06—Work supports, e.g. adjustable steadies
- B24B41/066—Work supports, e.g. adjustable steadies adapted for supporting work in the form of tools, e.g. drills
Definitions
- the present invention relates to a grinding machine having a grinding jig to be used at the grinding of a straight edge woodworking tool on the peripheral surface of a rotating grindstone in the grinding machine, which has a cylindrical support bar parallel with the rotation axis of the grindstone, wherein the jig comprises a base, which is parallel with the support bar and is intended for slidable and rotational mounting thereon, and a clamp, the tool being attached between the base and the clamp.
- this 90° edge angle is normally not imperative. However, if for example 89° is obtained, the same angle will probably not be obtained at the following grinding. The result will be a faceted shape for the edge or that more tool material than otherwise needed will have to be ground away.
- the problem basically stems from the fact that the position of the tool in the jig and hence in relation to the grindstone is dependent on the manual tightening of two knobs on the jig for obtaining the desired result that the face of the tool becomes exactly parallel with the grinding surface of the grindstone.
- the tool will always be parallel with the grinding surface of the grindstone, which is a prerequisite for the desired result.
- the clamp will hereby be arranged between the base and the support bar, instead of above the base as in the conventional design.
- the tool will become correctly positioned in relation to the grindstone for obtaining the 90° edge angle, if the base is provided with a shoulder for the tool to engage at one end of the support surface, said shoulder being perpendicular to the support bar.
- a clamping surface of the clamp is longitudinally beveled.
- a security stop may be provided on the cylindrical support bar at either side of the grinding jig for preventing the tool from laterally leaving the grindstone.
- a grinding jig for a grinding machine as described above is also within the scope of the appended claims.
- a conventional grinding machine 1 is shown in Fig 1 .
- the machine is provided with a grindstone 2 driven for rotation by an electric motor in the machine.
- the machine 1 is provided with a cylindrical support bar 3, called a universal support, which is parallel with the rotation axis of the grindstone 2.
- the position of the universal support can be adjusted to suit different purposes at grinding of different edge tools by the grindstone 2.
- a grinding jig 4 for a straight edge tool 5 is mounted for lateral and rotational movements on the universal support 3.
- tools that can be ground or sharpened by the grinding machine 1 and attached in the grinding jig 4 are plane irons, wood chisels and spoke shave blades. With the tool 5 attached in the jig 4 as shown, the tool may be manually brought in engagement with the rotating grindstone 2 and be laterally moved over the grindstone by means of the jig 4, which is slidable on the universal support 3.
- the jig basically comprises a base 6 and a clamp 7.
- the base 6 has two legs 6' each provided with a circular hole 6" ( Fig 3 ) for slidable mounting on the universal support 3. On its side opposite the legs 6', the base is provided with two fixed screws 8 (of which only the left one is visible in Fig 2 ). Stops 9 for aligning a tool 5 are arranged on either side of the base 6, leaving room for the clamp 7 between them.
- the clamp 7 has two holes corresponding to the screws 8. Threaded knobs 10 are attached to the screws 8 above the clamp 7.
- a tool 5 is placed between the base 6 and the clamp 7 against the stops 9 and can be clamped to a fixed position by means of the screws 8.
- the tool 5 is placed with its flat machined side, called face, or side opposite the bevel facing the clamp 7 for obtaining the grinding geometry shown in Fig 1 .
- Fig 4 showing a grinding jig according to the invention.
- This jig has the same main constituents as the conventional one shown in Fig 2 , namely a base 15 and a clamp 16.
- the clamp 16 has two fixed screws 17 to extend through corresponding holes in the base 15.
- a knob 18 is in thread engagement with each screw 17 for determination of the distance between the base 15 and the clamp 16.
- a compression spring 19 may be arranged around each screw 17 for biasing the base 15 and the clamp 16 apart.
- the base 15 has two legs 15' each provided with a circular hole 15" ( Fig 5 ) for slidable mounting on the universal support 3.
- the base On its side facing the universal support 3 the base is provided with a support surface 15A, which preferably is plane. It is parallel with the universal support, i e the two distances D are equal.
- the tool 5 is to be placed with its face or flat machine side opposite its bevel against this support surface 15A, whereupon it is clamped in position by the movable clamp 16, operated by the knobs 18.
- the surface 15A is ended by a shoulder 16B in the base 15.
- This shoulder 16B is perpendicular to the longitudinal direction of the base 15 and thus the universal support 3.
- the tool 5 will always be guided by the base 15 with its surface 15A and shoulder 15B to be in the correct position for grinding (and thus for obtaining the desired 90° edge angle) irrespective of the position of the clamp 16.
- This is illustrated in Fig 4 , where the clamp 16 forms an angle ⁇ with the base surface 15B without any negative influence on the correct position of the tool 5.
- FIG. 1 shows a conventional jig, where the clamping surfaces of the base 6 and the clamp 7 are plane and parallel, which means that the tool 5, if it has a conical shape as shown, is only clamped as indicated by the arrows, resulting in a less stable clamping.
- the clamping surface of the clamp 16 may be longitudinally beveled, which results in a more favourable clamping of a possibly conical tool 5, as indicated by the arrows, with the face of the tool in flat contact with the base surface 15A.
- FIG 1 A further feature of the grinding machine according to the invention is illustrated in Fig 1 .
- the grinding jig is freely slidable along the universal support 3. This means that the tool 5 in the grinding jig 4 may leave its grinding engagement with the grindstone 2, possibly resulting in injuries on the operator's fingers.
- the universal support 3 may be provided with two security stops 20, 21.
- the stop 20 to the right in Fig 1 is fixed and can have the form of a screw in a threaded axial hole in the end of the universal support 3.
- the reason for it to be fixed is that the tool 5 has a fixed position against the shoulder 15B to the left in the drawing.
- the other stop 21 to the left in the drawing is adjustable: its position on the universal support can be adjusted according to the width of the tool 5, so that the tool can not leave its grinding engagement with the grindstone 2.
- the stop 21 can have the form of a screw operated clamp.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
- Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
Abstract
Description
- The present invention relates to a grinding machine having a grinding jig to be used at the grinding of a straight edge woodworking tool on the peripheral surface of a rotating grindstone in the grinding machine, which has a cylindrical support bar parallel with the rotation axis of the grindstone, wherein the jig comprises a base, which is parallel with the support bar and is intended for slidable and rotational mounting thereon, and a clamp, the tool being attached between the base and the clamp.
- It is well known in the art of grinding machines as defined that it is difficult to obtain an exact 90° edge angle at the grinding in a conventional straight edge jig intended for grinding such woodworking tools as plane irons, wood chisels and spoke shave blades. The design of such a jig is such that manual skill is needed from the operator for obtaining the desired exact 90° edge angle.
- It may be held that the obtaining of this 90° edge angle is normally not imperative. However, if for example 89° is obtained, the same angle will probably not be obtained at the following grinding. The result will be a faceted shape for the edge or that more tool material than otherwise needed will have to be ground away.
- The problem basically stems from the fact that the position of the tool in the jig and hence in relation to the grindstone is dependent on the manual tightening of two knobs on the jig for obtaining the desired result that the face of the tool becomes exactly parallel with the grinding surface of the grindstone.
- The above problem is according to the invention solved by a support surface on the side of the base facing the grindstone and parallel therewith for supporting the tool by its flat machined side or face opposite its bevel.
- By the provision of this support surface, the tool will always be parallel with the grinding surface of the grindstone, which is a prerequisite for the desired result.
- The clamp will hereby be arranged between the base and the support bar, instead of above the base as in the conventional design.
- The tool will become correctly positioned in relation to the grindstone for obtaining the 90° edge angle, if the base is provided with a shoulder for the tool to engage at one end of the support surface, said shoulder being perpendicular to the support bar.
- In order to obtain a secure fastening of a tool, even if it has for example a conical shape, a clamping surface of the clamp is longitudinally beveled.
- A security stop may be provided on the cylindrical support bar at either side of the grinding jig for preventing the tool from laterally leaving the grindstone.
- A grinding jig for a grinding machine as described above is also within the scope of the appended claims.
- The invention will be described in further detail below under reference to the accompanying drawings, in which
-
Fig 1 is an isometric view of a grinding machine with a grinding jig according to the invention, -
Fig 2 is a front view of a known grinding jig, -
Fig 3 is a side view, partly in section, of the jig shown inFig 2 , -
Fig 4 is a front view of a grinding jig according to the invention, and -
Fig 5 is a side view, partly in section, of the jig shown inFig 4 . - A
conventional grinding machine 1 is shown inFig 1 . The machine is provided with agrindstone 2 driven for rotation by an electric motor in the machine. Themachine 1 is provided with acylindrical support bar 3, called a universal support, which is parallel with the rotation axis of thegrindstone 2. The position of the universal support can be adjusted to suit different purposes at grinding of different edge tools by thegrindstone 2. - A grinding jig 4 for a
straight edge tool 5 is mounted for lateral and rotational movements on theuniversal support 3. Examples of tools that can be ground or sharpened by thegrinding machine 1 and attached in the grinding jig 4 are plane irons, wood chisels and spoke shave blades. With thetool 5 attached in the jig 4 as shown, the tool may be manually brought in engagement with therotating grindstone 2 and be laterally moved over the grindstone by means of the jig 4, which is slidable on theuniversal support 3. - A conventional or known grinding jig is shown in
Fig 2 . The jig basically comprises abase 6 and aclamp 7. - The
base 6 has two legs 6' each provided with acircular hole 6" (Fig 3 ) for slidable mounting on theuniversal support 3. On its side opposite the legs 6', the base is provided with two fixed screws 8 (of which only the left one is visible inFig 2 ). Stops 9 for aligning atool 5 are arranged on either side of thebase 6, leaving room for theclamp 7 between them. - The
clamp 7 has two holes corresponding to the screws 8. Threadedknobs 10 are attached to the screws 8 above theclamp 7. Atool 5 is placed between thebase 6 and theclamp 7 against the stops 9 and can be clamped to a fixed position by means of the screws 8. Thetool 5 is placed with its flat machined side, called face, or side opposite the bevel facing theclamp 7 for obtaining the grinding geometry shown inFig 1 . - In order to obtain an exact 90° grinding of the edge, it is imperative that the face of the
tool 5 abutting theclamp 7 or in other words theclamp 7 is parallel to theuniversal support 3 and hence the surface of thegrindstone 2. The position of theclamp 7 depends on the manual setting of the twoknobs 10. Experience shows that the desired position of theclamp 7 is very difficult to obtain and that accordingly the exact 90° grinding of the edge is not normally obtained. It is for example quite natural to tighten theleft hand knob 10 inFig 2 or the knob at a distance from thetool 5 harder than the right one, resulting in the situation illustrated inFig 2 with an angle α between thebase 6 and theclamp 7. The tool 5 - being parallel to the clamp 7 - will accordingly not be parallel to thegrindstone 2, resulting in an edge angle differing from 90°. - Reference is now made to
Fig 4 showing a grinding jig according to the invention. This jig has the same main constituents as the conventional one shown inFig 2 , namely abase 15 and aclamp 16. Theclamp 16 has twofixed screws 17 to extend through corresponding holes in thebase 15. Aknob 18 is in thread engagement with eachscrew 17 for determination of the distance between thebase 15 and theclamp 16. Acompression spring 19 may be arranged around eachscrew 17 for biasing thebase 15 and theclamp 16 apart. - The
base 15 has two legs 15' each provided with acircular hole 15" (Fig 5 ) for slidable mounting on theuniversal support 3. - On its side facing the
universal support 3 the base is provided with a support surface 15A, which preferably is plane. It is parallel with the universal support, i e the two distances D are equal. Thetool 5 is to be placed with its face or flat machine side opposite its bevel against this support surface 15A, whereupon it is clamped in position by themovable clamp 16, operated by theknobs 18. - To the right in
Fig 4 the surface 15A is ended by a shoulder 16B in thebase 15. This shoulder 16B is perpendicular to the longitudinal direction of thebase 15 and thus theuniversal support 3. - By this design the
tool 5 will always be guided by thebase 15 with its surface 15A andshoulder 15B to be in the correct position for grinding (and thus for obtaining the desired 90° edge angle) irrespective of the position of theclamp 16. This is illustrated inFig 4 , where theclamp 16 forms an angle β with thebase surface 15B without any negative influence on the correct position of thetool 5. - A further positive feature of the invention appears at a comparison between
Fig 3 and Fig 5. Fig 3 shows a conventional jig, where the clamping surfaces of thebase 6 and theclamp 7 are plane and parallel, which means that thetool 5, if it has a conical shape as shown, is only clamped as indicated by the arrows, resulting in a less stable clamping. In the jig according to the invention on the other hand and as shown inFig 5 ,the clamping surface of theclamp 16 may be longitudinally beveled, which results in a more favourable clamping of a possiblyconical tool 5, as indicated by the arrows, with the face of the tool in flat contact with the base surface 15A. - A further feature of the grinding machine according to the invention is illustrated in
Fig 1 . In aconventional grinding machine 1 the grinding jig is freely slidable along theuniversal support 3. This means that thetool 5 in the grinding jig 4 may leave its grinding engagement with thegrindstone 2, possibly resulting in injuries on the operator's fingers. - According to the invention, however, the
universal support 3 may be provided with two security stops 20, 21. Thestop 20 to the right inFig 1 is fixed and can have the form of a screw in a threaded axial hole in the end of theuniversal support 3. The reason for it to be fixed is that thetool 5 has a fixed position against theshoulder 15B to the left in the drawing. The other stop 21 to the left in the drawing is adjustable: its position on the universal support can be adjusted according to the width of thetool 5, so that the tool can not leave its grinding engagement with thegrindstone 2. The stop 21 can have the form of a screw operated clamp.
Claims (6)
- A grinding machine having a grinding jig (4) to be used at the grinding of a straight edge woodworking tool (5) on the peripheral surface of a rotating grindstone (2) in the grinding machine (1), which has a cylindrical support bar (3) parallel with the rotation axis of the grindstone, wherein the jig (4) comprises a base (15), which is parallel with the support bar (3) and is intended for slidable and rotational mounting thereon, and a clamp (16), the tool (5) being attached between the base and the clamp, characterized by a support surface (15A) on the side of the base (15) facing the grindstone (2) and parallel therewith for supporting the tool (5) by its flat machined side or face opposite its bevel.
- A grinding machine according to claim 1, wherein the clamp (16) is arranged between the base (15) and the support bar (3).
- A grinding machine according to claim 1, wherein the base (15) is provided with a shoulder (15B) for the tool (5) to engage at one end of the support surface (15A), said shoulder being perpendicular to the support bar (3).
- A grinding machine according to claim 1, wherein a clamping surface of the clamp (16) is longitudinally beveled.
- A grinding machine according to claim 1, wherein a security stop (20, 21) is provided on the cylindrical support bar (3) at either side of the grinding jig (4) for preventing the tool (5) from laterally leaving the grindstone (2).
- A grinding jig for a grinding machine according to any of the preceding claims.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0701066A SE531802C2 (en) | 2007-05-04 | 2007-05-04 | Sander and grinding machine therefore |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1987916A1 true EP1987916A1 (en) | 2008-11-05 |
EP1987916B1 EP1987916B1 (en) | 2011-01-05 |
Family
ID=39710933
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP08155316A Active EP1987916B1 (en) | 2007-05-04 | 2008-04-29 | A grinding machine and a grinding jig therefore |
Country Status (5)
Country | Link |
---|---|
US (2) | US20080274678A1 (en) |
EP (1) | EP1987916B1 (en) |
AT (1) | ATE494097T1 (en) |
DE (1) | DE602008004277D1 (en) |
SE (1) | SE531802C2 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102848310A (en) * | 2011-06-27 | 2013-01-02 | 信越化学工业株式会社 | Magnet holding jig |
EP2660005A3 (en) * | 2012-05-03 | 2014-11-26 | Tormek AB | A knife jig assembly |
EP3718690A1 (en) * | 2019-04-05 | 2020-10-07 | Tormek AB | An arrangement for grinding edged tools |
US11517998B2 (en) | 2019-04-05 | 2022-12-06 | Tormek Ab | Grinding jig for a blade tool |
SE2250303A1 (en) * | 2022-03-07 | 2023-03-07 | Tormek Ab | A grinding angle setting device, a grinding system and a method of setting a grinding angle |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
USD705029S1 (en) * | 2011-10-14 | 2014-05-20 | Cequent Consumer Products, Inc. | Anchor point clamp |
US9642778B1 (en) | 2014-11-09 | 2017-05-09 | Michael D. Yazbeck | Feeding tube holder |
SE539239C2 (en) | 2015-02-18 | 2017-05-23 | Tormek Ab | Adjustable grinding jig |
CN104816246B (en) * | 2015-05-15 | 2017-03-08 | 重庆江增船舶重工有限公司 | The special purpose grinder fixture of supercharger sliding bearing |
US20170173760A1 (en) * | 2015-07-23 | 2017-06-22 | Byron Joseph Hourmand | Electronic Bevel Jig |
USD1007269S1 (en) * | 2021-01-08 | 2023-12-12 | Tormek Ab | Kitchen knife sharpener |
USD957487S1 (en) * | 2021-07-29 | 2022-07-12 | Shenzhen Jialexin Technology Co., Ltd. | Welding jig |
USD980033S1 (en) * | 2022-08-08 | 2023-03-07 | Woodpeckers, Llc | Table saw jig |
Citations (3)
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US6676495B1 (en) * | 2000-08-30 | 2004-01-13 | Lee Valley Tools Ltd. | Power sharpening system |
US20050090184A1 (en) * | 2003-09-08 | 2005-04-28 | Ross Zhang | Electric sharpener |
US20060258271A1 (en) | 2005-05-11 | 2006-11-16 | Donald Naples | Tool sharpening and compound honing jig |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
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US2257354A (en) * | 1940-08-08 | 1941-09-30 | Stresoff Bogola | Clamp and bracket structure |
US4095376A (en) * | 1976-10-29 | 1978-06-20 | Lotane John H | Clamping device for use in sharpening shears and the like |
US5157870A (en) * | 1991-02-08 | 1992-10-27 | Pike Arthur E | Precision clamp scissors sharpening system |
US5291690A (en) * | 1991-02-08 | 1994-03-08 | Arthur Pike | Nipper clamp for precison clamp scissors sharpening system |
US5938511A (en) * | 1997-11-21 | 1999-08-17 | Patterson; James D. | Grinding guide assembly |
US6935937B2 (en) * | 2003-12-05 | 2005-08-30 | Kenneth Leslie Port | Tool grinding jig |
-
2007
- 2007-05-04 SE SE0701066A patent/SE531802C2/en unknown
-
2008
- 2008-04-29 AT AT08155316T patent/ATE494097T1/en not_active IP Right Cessation
- 2008-04-29 EP EP08155316A patent/EP1987916B1/en active Active
- 2008-04-29 DE DE602008004277T patent/DE602008004277D1/en active Active
- 2008-05-01 US US12/149,418 patent/US20080274678A1/en not_active Abandoned
-
2011
- 2011-04-22 US US29/371,559 patent/USD651884S1/en active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6676495B1 (en) * | 2000-08-30 | 2004-01-13 | Lee Valley Tools Ltd. | Power sharpening system |
US20050090184A1 (en) * | 2003-09-08 | 2005-04-28 | Ross Zhang | Electric sharpener |
US20060258271A1 (en) | 2005-05-11 | 2006-11-16 | Donald Naples | Tool sharpening and compound honing jig |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102848310A (en) * | 2011-06-27 | 2013-01-02 | 信越化学工业株式会社 | Magnet holding jig |
CN102848310B (en) * | 2011-06-27 | 2016-08-03 | 信越化学工业株式会社 | Magnet keeps fixture |
EP2660005A3 (en) * | 2012-05-03 | 2014-11-26 | Tormek AB | A knife jig assembly |
US9186767B2 (en) | 2012-05-03 | 2015-11-17 | Tormek Ab | Knife jig assembly |
EP3718690A1 (en) * | 2019-04-05 | 2020-10-07 | Tormek AB | An arrangement for grinding edged tools |
US11517998B2 (en) | 2019-04-05 | 2022-12-06 | Tormek Ab | Grinding jig for a blade tool |
US11628536B2 (en) | 2019-04-05 | 2023-04-18 | Tormek Ab | Arrangement for grinding edged tools |
US11833639B2 (en) | 2019-04-05 | 2023-12-05 | Tormek Ab | Arrangement for grinding edged tools |
SE2250303A1 (en) * | 2022-03-07 | 2023-03-07 | Tormek Ab | A grinding angle setting device, a grinding system and a method of setting a grinding angle |
SE545039C2 (en) * | 2022-03-07 | 2023-03-07 | Tormek Ab | A grinding angle setting device, a grinding system and a method of setting a grinding angle |
Also Published As
Publication number | Publication date |
---|---|
DE602008004277D1 (en) | 2011-02-17 |
SE0701066L (en) | 2008-11-05 |
US20080274678A1 (en) | 2008-11-06 |
EP1987916B1 (en) | 2011-01-05 |
ATE494097T1 (en) | 2011-01-15 |
USD651884S1 (en) | 2012-01-10 |
SE531802C2 (en) | 2009-08-11 |
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