EP0249588B1 - Grinding device for grinding scissors - Google Patents

Grinding device for grinding scissors Download PDF

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Publication number
EP0249588B1
EP0249588B1 EP87850152A EP87850152A EP0249588B1 EP 0249588 B1 EP0249588 B1 EP 0249588B1 EP 87850152 A EP87850152 A EP 87850152A EP 87850152 A EP87850152 A EP 87850152A EP 0249588 B1 EP0249588 B1 EP 0249588B1
Authority
EP
European Patent Office
Prior art keywords
clamping plate
scissors
clamping
blade
grinding
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.)
Expired - Lifetime
Application number
EP87850152A
Other languages
German (de)
French (fr)
Other versions
EP0249588A1 (en
Inventor
Torgny Jansson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tormek AB
Original Assignee
Tormek AB
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tormek AB filed Critical Tormek AB
Priority to AT87850152T priority Critical patent/ATE55303T1/en
Publication of EP0249588A1 publication Critical patent/EP0249588A1/en
Application granted granted Critical
Publication of EP0249588B1 publication Critical patent/EP0249588B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B24B3/52—Sharpening cutting edges, e.g. of tools; Accessories therefor, e.g. for holding the tools of cutting blades of shear blades or scissors

Definitions

  • This invention relates to a grinding device for grinding scissors in accordance with the preamble of claim 1.
  • a grinding device for grinding scissors in accordance with the preamble of claim 1.
  • Such a device is known from US-A 3 755 971. So far there has been no good aid for grinding scissors by means of a grindstone.
  • the blades of the scissors can be plane, be straight or arcuately tapering longitudinally, have a cross section that is plane or like a partial circle, and have an edge which is straight or convex lengthwise of the blade.
  • the cutting angle is very sharp in scissors.
  • US-A 3 755 971 deals with one attempt to solve the problems in grinding or sharpening scissors by means of a grinder, in which the scissor is to be clamped.
  • the angle between the edges of the scissors is very critical and depends on the type of scissor, the aim of the scissor and in some case the dimension of the scissor and this grinder gives only the possibility to rise or lower the scissor edge in a straight path in front of the grinding wheel, which confines the possibility to grind all possible and necessary angles.
  • As the platform, clamping the scissor in front of the grinding wheel is not movable in the axial direction of the wheel, it is not possible to grind long scissor blades as they would cantilever and lack support enough to be grounded.
  • Fig. is a schematic partial view of a pair of scissors clamped in a fixture according to the invention.
  • F i g. 2 shows a cross section of the fixture according to Fig. 1
  • Fig. 3 shows a longitudinal section of the fixture shown in Fig. 1.
  • FIG. 1 denotes a grindstone and 2 a support fixely secured to the grinding machine in the form of a yoke with an arm 3 extending in parallel with the axis of the grindstone 1.
  • the grinding fixture consists of a support plate 4 which is bent at right angles and carries a welded pipe or a bushing 5, by means of which the support plate is supported by the arm 3, so that it can be moved and turned.
  • a threaded, through hole is made in the wall of the bushing 5 in which a screw provided with a knob is threaded.
  • the knob has the reference numeral 6.
  • a first clamping plate 7 which in the example shown has a layer of low-friction material 8, for example teflon R on the side facing the support plate 4, abuts on the support plate 4 freely movably. Moreover, the first clamping plate 7 has two threaded holes 9 in the example shown. Two other clamping plates 10 have through holes 11 corresponding to the threaded holes 9, through which set screws 12 pass. In the respective second clamping plate 10 a locking screw 13 provided with a wheel is arranged to be screwed into the plate at some distance from the set screws 12. In the example shown the threads of the screw 13 are made in a threaded bushing 14 arranged in the respective plate 10.
  • the head of the respective set screw 12 has a partly spherical inside resting in a corresponding partly spherical seat of the second clamping plate 10.
  • the distance between the second clamping plates 10 and the first clamping plate 7 can be optionally adjusted in dependence on the thickness of the blade 15 of the scissors to be ground by means of the screws 12.
  • Fig. 3 there is shown a blade of a pair of scissors, the thickness of which decreases towards the tip and it is clearly apparent from the figure how different an adjustment of the distance of the second clamping plates 10 from the first clamping plate 7 is required.
  • the partly spherical head form of the screw 12 and its coacting seat of the respective clamping plate 10 these can adjust themselves obliquely and independently of one another relative to the first clamping plate 7. Consequently there is a possibility for a complete adaption of the clamping plates to the form of the blade of the pair of scissors, the edge of which is to be ground.
  • the respective second clamping plate 10 at each end of the locking edge area is provided with a downwardly directed flange 16 (see Fig. 3). These flanges can be simply obtained by for instance milling the central area in the respective plate.
  • a pair of guide pins schematically shown in Fig. 1 and designated by 17 are attached to the respective plate 10. These pins extend freely movably through the corresponding holes or openings in the first clamping plate 7.
  • helical compression springs can be arranged around the respective pin 17 between the plates 10 and the plate 7, which springs tend to separate the plates 10 from the plate 7 automatically which makes it easier to place the blade of the pair of scissors between the edge portions of the plates.
  • the fixture can be adapted to the thickness of the current blade of the pair of scissors and said blade is clamped in the fixture when tightening the locking screws 13.
  • the clamping plates 10 will adapt themselves automatically to the form of the relative blade independently of whether its cross section is conical or in the form of a partial circle or if it is conical longitudinally.
  • the support plate 4 is locked by means of the screw 6 at the arm 3 with the current edge angle of the pair of scissors, and the part of the fixture formed by the clamping plates 7 and 10 can now be moved backwards and forwards supporting against the plate 5 while the edge of the pair of scissors is being ground. In this way the motion can be simply adapted so that the possibly arcuate edge of the pair of scissors is in contact with the screw all the time.
  • the low friction material 8 makes this motion easier. However, it is to be understood that this low friction material is not necessary but can be obmit- ted.
  • a fixture with two other clamping plates 10 has been described above, but of course more than two such clamping plates can be used. Of course it is possible, for example when grinding only small pairs of scissors, to use a fixture having only one second clamping plate 10.
  • the shapes of the support plate 4, the first clamping plate 7 and the second clamping plates 10 can of course vary and deviate from the shapes shown here.
  • the guide pins 17 can be attached to the first clamping plate 7 instead of the plates 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Scissors And Nippers (AREA)

Abstract

Grinding fixture for grinding scissors by means of a rotatable grindstone (1) using an adjustable support arm (3) arranged at the grindstone base and extending transversely of the grindstone (1) in parallel with the axis thereof. According to the invention the grinding fixture comprises a support plate (4) movably and rotatably fixable to the support arm (3), a first clamping plate (7) abutting on the support plate (4) freely movably as well as at least one second clamping plate (10) having a clamping edge. One blade (15) of a pair of scissors to be ground can be clamped between the clamping edge and the first clamping plate (7) be means of one or more screws (12, 13).

Description

  • This invention relates to a grinding device for grinding scissors in accordance with the preamble of claim 1. Such a device is known from US-A 3 755 971.
    So far there has been no good aid for grinding scissors by means of a grindstone. The blades of the scissors can be plane, be straight or arcuately tapering longitudinally, have a cross section that is plane or like a partial circle, and have an edge which is straight or convex lengthwise of the blade. In addition, the cutting angle is very sharp in scissors.
  • US-A 3 755 971 deals with one attempt to solve the problems in grinding or sharpening scissors by means of a grinder, in which the scissor is to be clamped. However the angle between the edges of the scissors is very critical and depends on the type of scissor, the aim of the scissor and in some case the dimension of the scissor and this grinder gives only the possibility to rise or lower the scissor edge in a straight path in front of the grinding wheel, which confines the possibility to grind all possible and necessary angles. As the platform, clamping the scissor in front of the grinding wheel, is not movable in the axial direction of the wheel, it is not possible to grind long scissor blades as they would cantilever and lack support enough to be grounded.
  • By means of this invention it is possible to overcome these drawbacks and mentioned of the known and incomplete grinder, as it is apparent from the characterizing portions of the claims, to adjust and move the edges of the scissors - one at a time - across the grindstone by means of a holder or grinding fixture so that the best possible result is obtained independently of the form of the blades and angles of the edges of the scissors. Also an unexperienced person can grind all types of scissors simply and quickly by means of the grinding fixture of the invention.
  • The invention will be described in greater detail in the form of an example with reference to the drawing wherein Fig. is a schematic partial view of a pair of scissors clamped in a fixture according to the invention. Fig. 2 shows a cross section of the fixture according to Fig. 1 and Fig. 3 shows a longitudinal section of the fixture shown in Fig. 1.
  • In the figure 1 denotes a grindstone and 2 a support fixely secured to the grinding machine in the form of a yoke with an arm 3 extending in parallel with the axis of the grindstone 1.
  • The grinding fixture consists of a support plate 4 which is bent at right angles and carries a welded pipe or a bushing 5, by means of which the support plate is supported by the arm 3, so that it can be moved and turned. A threaded, through hole is made in the wall of the bushing 5 in which a screw provided with a knob is threaded. The knob has the reference numeral 6. By means of the knob and the screw attached to this the support plate 4 can be fixed in a suitable position along the arm 3 and at the intended angle defined by the edge angle of the pair of scissors to be ground.
  • A first clamping plate 7 which in the example shown has a layer of low-friction material 8, for example teflonR on the side facing the support plate 4, abuts on the support plate 4 freely movably. Moreover, the first clamping plate 7 has two threaded holes 9 in the example shown. Two other clamping plates 10 have through holes 11 corresponding to the threaded holes 9, through which set screws 12 pass. In the respective second clamping plate 10 a locking screw 13 provided with a wheel is arranged to be screwed into the plate at some distance from the set screws 12. In the example shown the threads of the screw 13 are made in a threaded bushing 14 arranged in the respective plate 10.
  • The head of the respective set screw 12 has a partly spherical inside resting in a corresponding partly spherical seat of the second clamping plate 10. The distance between the second clamping plates 10 and the first clamping plate 7 can be optionally adjusted in dependence on the thickness of the blade 15 of the scissors to be ground by means of the screws 12. In Fig. 3 there is shown a blade of a pair of scissors, the thickness of which decreases towards the tip and it is clearly apparent from the figure how different an adjustment of the distance of the second clamping plates 10 from the first clamping plate 7 is required. By the partly spherical head form of the screw 12 and its coacting seat of the respective clamping plate 10 these can adjust themselves obliquely and independently of one another relative to the first clamping plate 7. Consequently there is a possibility for a complete adaption of the clamping plates to the form of the blade of the pair of scissors, the edge of which is to be ground.
  • As is clearly apparent from Fig. 2 the free end of the locking screw 13 engages the first clamping plate 7 and due to the fact that the set screw 12 at the respective second clamping plate 10 is arranged in the vicinity of the region where the blade of the pair of. scissors is adapted and the locking screw is arranged on the opposite side relative to the blade and spaced from the set screw 13, when turned, will swing the second clamping plate 10 from the first clamping plate 7 with the set screw 12 as turning point and consequently lock the blade 15 placed between the edge portions of the clamping plates 10 and 7. By this "lever principle" it is possible to attain very great locking forces for the blade of the pair of scissors.
  • In order to achieve defined locking ranges of the blade of the pair of scissors the respective second clamping plate 10 at each end of the locking edge area is provided with a downwardly directed flange 16 (see Fig. 3). These flanges can be simply obtained by for instance milling the central area in the respective plate. In order to control easily the second clamping plates 10 relative to the first clamping plate 7 a pair of guide pins schematically shown in Fig. 1 and designated by 17 are attached to the respective plate 10. These pins extend freely movably through the corresponding holes or openings in the first clamping plate 7. Moreover, helical compression springs can be arranged around the respective pin 17 between the plates 10 and the plate 7, which springs tend to separate the plates 10 from the plate 7 automatically which makes it easier to place the blade of the pair of scissors between the edge portions of the plates.
  • Thus, by adjusting the screws 12 the fixture can be adapted to the thickness of the current blade of the pair of scissors and said blade is clamped in the fixture when tightening the locking screws 13. Thus, the clamping plates 10 will adapt themselves automatically to the form of the relative blade independently of whether its cross section is conical or in the form of a partial circle or if it is conical longitudinally. The support plate 4 is locked by means of the screw 6 at the arm 3 with the current edge angle of the pair of scissors, and the part of the fixture formed by the clamping plates 7 and 10 can now be moved backwards and forwards supporting against the plate 5 while the edge of the pair of scissors is being ground. In this way the motion can be simply adapted so that the possibly arcuate edge of the pair of scissors is in contact with the screw all the time. The low friction material 8 makes this motion easier. However, it is to be understood that this low friction material is not necessary but can be obmit- ted.
  • A fixture with two other clamping plates 10 has been described above, but of course more than two such clamping plates can be used. Of course it is possible, for example when grinding only small pairs of scissors, to use a fixture having only one second clamping plate 10. The shapes of the support plate 4, the first clamping plate 7 and the second clamping plates 10 can of course vary and deviate from the shapes shown here. Moreover, the guide pins 17 can be attached to the first clamping plate 7 instead of the plates 10.

Claims (6)

1. A grinding device comprising a grindstone (1), rotatable around a horizontal axis, a grindstone base and a grinding fixture for grinding scissors, using a vertically adjustable support arm (3) arranged at the grindstone base, a first clamping plate (7) abutting freely movably on a support plate (4) and at least one second clamping plate (10) having a clamping edge, one blade (15) of a pair of scissors to be ground being clampable between the clamping edge and the first clamping plate (7) by means of one or more screws (12, 13), characterized in that the support arm (3) extends transversly of the grindstone (1) in parallel with the axis thereof, in that the support plate (4) is movable along and rotatable around the axis of the support arm (3), and in that the support plate (4) is movably and rotatably fixable to the support arm (3).
2. The grinding device of claim 1, characterized in that the clamping edge of the second clamping plate (10) has flanges (16) arranged in spaced relationship, facing the blade (15) of the pair of scissors and extending transversely of the blade.
3. The grinding device of claim 1 or 2, characterized in that two or more second clamping plates (10) are arranged beside each other on the first clamping plate (7) in order to adapt themselves each and clamp their part of the blade (15) against the first clamping plate (7).
4. The grinding device of any one of the preceding claims, characterized in that the first clamping plate (7) and the second clamping plate (10) are connected to each other by means of a set screw (12) adjusting the mutual distance of the plates (7, 10).
5. The grinding device of claim 4, characterized in that a locking screw (13) is arranged to be screwed into a threaded hole (14) extending through the first or second clamping plate (7 and 10, respectively), said hole being located on the opposite side of the set screw (12) relative to the blade (15) of the pair of scissors to be ground, and that one end of the locking screw (13) engages the second and first clamping plate (7, 10), respectively.
6. The grinding device of any one of the preceding claims, characterized in that the first or the second clamping plate (7 and 10, respectively) has at least one fixed guide pin (17) coacting with an aperture arranged in the coacting clamping plate (7, 10) and that a compression spring is arranged between the plates in connection with the guide pin (17).
EP87850152A 1986-05-13 1987-05-11 Grinding device for grinding scissors Expired - Lifetime EP0249588B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87850152T ATE55303T1 (en) 1986-05-13 1987-05-11 DEVICE FOR GRINDING SCISSORS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8602170 1986-05-13
SE8602170A SE453166B (en) 1986-05-13 1986-05-13 SLIP FIXING FOR SHIPPING GRINDING

Publications (2)

Publication Number Publication Date
EP0249588A1 EP0249588A1 (en) 1987-12-16
EP0249588B1 true EP0249588B1 (en) 1990-08-08

Family

ID=20364511

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87850152A Expired - Lifetime EP0249588B1 (en) 1986-05-13 1987-05-11 Grinding device for grinding scissors

Country Status (5)

Country Link
EP (1) EP0249588B1 (en)
AT (1) ATE55303T1 (en)
DE (1) DE3764200D1 (en)
ES (1) ES2016657B3 (en)
SE (1) SE453166B (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE450696B (en) * 1985-09-02 1987-07-20 Torgny Jansson KNIFE GRIPFIX
DE3736438C2 (en) * 1987-01-20 2000-11-23 Siepmann & Co Gmbh & Co E Grinding machine, in particular for grinding scissor parts
US7118466B2 (en) 2004-11-22 2006-10-10 Laney W L Scissor sharpening machine

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1390726A (en) * 1919-10-18 1921-09-13 Albert T Scheiwer Shears-grinder
US2191600A (en) * 1937-08-25 1940-02-27 Leo J Wahl Grinder
US2753666A (en) * 1952-01-18 1956-07-10 Elmer C Sasse Scissors sharpener
US3053019A (en) * 1960-10-05 1962-09-11 Charles B Mozdy Sharpening implements
US3574268A (en) * 1969-02-19 1971-04-13 Frederick A Buse Tool sharpening apparatus
US3755971A (en) * 1971-10-20 1973-09-04 T Garcia Shears and scissors grinder
US3879899A (en) * 1973-03-28 1975-04-29 William J Ribar Scissors sharpener

Also Published As

Publication number Publication date
DE3764200D1 (en) 1990-09-13
ATE55303T1 (en) 1990-08-15
EP0249588A1 (en) 1987-12-16
SE8602170L (en) 1987-11-14
ES2016657B3 (en) 1990-11-16
SE8602170D0 (en) 1986-05-13
SE453166B (en) 1988-01-18

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