EP0216575A1 - Lame - Google Patents

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Publication number
EP0216575A1
EP0216575A1 EP19860307007 EP86307007A EP0216575A1 EP 0216575 A1 EP0216575 A1 EP 0216575A1 EP 19860307007 EP19860307007 EP 19860307007 EP 86307007 A EP86307007 A EP 86307007A EP 0216575 A1 EP0216575 A1 EP 0216575A1
Authority
EP
European Patent Office
Prior art keywords
cutter
cutting
blade
edge
stem
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Withdrawn
Application number
EP19860307007
Other languages
German (de)
English (en)
Inventor
Roger Justin Beveridge
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0216575A1 publication Critical patent/EP0216575A1/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • This invention relates to cutting blades and has particular reference to cutting blades for power tools.
  • Saw blades for power tools are well known but are suitable for cutting a limited range of materials only, for example timber and metal which have a degree of rigidity and are able to resist any tendency to move or flex with the saw blade during cutting.
  • Saw blades are not suitable for cutting sheet material of a flexible or resilient nature which, even when held close to the point of cut, tends to flex with the saw blade during cutting and this makes it impossible to cut the material satisfactorily.
  • a cutting blade for a power tool comprises a stem by means of which the blade is mounted in the tool, and a body having a cutting edge at least a part of which is inclined to the direction of reciprocation of the blade when in use.
  • the cutting blade may comprise a stem by means of which the body is of generally U-shape, the limbs extending away from the stem in the direction of recip­rocation of the blade when in use.
  • the part of the cutting edge may lie at the base of the U.
  • the part of the cutting edge is of curved form.
  • the part of the cutting edge comprises two curved edges.
  • the part of the cutting edge comprises two linear cutting edges that converge towards the stem.
  • Additional cutting edges may be formed along the facing edges of the limbs of the U.
  • the cutting blade may have a body of finger shape and extends away from the stem in the direction of reciprocation of the blade when in use, the part of the cutting edge being formed adjacent the junction between the stem and the body.
  • the part of the cutting edge may be curved.
  • an additional cutting edge extends along the length of the finger which is inclined with respect to the direction of reciprocation of the blade when in use.
  • Fig. l shows a hand-held, powered cutting tool with a casing l of elongate generally-cylindrical form.
  • the casing is of a clam shell construction comprising body halves 2, 3 of a plastics material.
  • the halves have mating edge configurations and are held together by screws 4 that pass through apertures in one body half and into holes in bosses in the other body half.
  • the casing l has a rear portion 5 of generally cylindrical shape and of a diameter that enables this portion to the casing to be readily grasped by the hand of a user to use the tool.
  • the rear portion 5 merges smoothly into a front portion 6 of slightly larger top-to-bottom dimensions than portion 5 and with flat top and bottom surfaces 7, 8 and angled shoulders 9 as can be seen in Fig. 3.
  • the forward wall l0 of the front portion 6 is angled downwardly as at ll to a flat nose to which is secured a front guard l2.
  • the guard l2 is of generally rectangular form when seen in front elevation as in Fig. 2 with side walls l3.
  • the guard has a deep V-shaped slot l4, the upper portions of the front wall adjacent the upper part of the slot being inclined backwardly as shown at l5 to allow a user a better view of a work area than that provided by the slot l4 alone.
  • the lower (as viewed in Fig. 2) edge of the guard is also slotted as at l6, the upper edge of the slot being contoured as at l7 to allow movement of a cover l8 referred to in greater detail below.
  • the guard l2 also has, in its front face, a hole l2 a of generally rectangular shape, the hole being positioned just below the tip of the slot l4.
  • the guard is secured to the casing by screws l2 b .
  • the hole l2 a is aligned with a hole (not shown) in the flat nose of the casing behind the guard l2.
  • a slide button l9 Extending through an aperture in the upper part of the casing is a slide button l9, movement of which controls the operation of an ON-OFF switch located inside the casing and shown in Fig. 4 as block 20 and referred to below.
  • the slide button l9 is so located as to be conveniently operated by the thumb of the hand grasping the rear portion 5.
  • the button l9 may be provided with a "lock-off" control (not shown).
  • Portion 5 also has air intake slots 2l whilst portion 6 has air exit slots 22.
  • the rear wall 23 of the casing is formed to receive a cable protector 24 through which extends a power cable whose end is secured inside the casing by means of a cable clamp indicated at 25.
  • Fig. 4 shows the tool with one body half removed to reveal the components housed within the casing.
  • the body half shown in Fig. 4 has internal ribs that support an electric motor unit 26 disposed longitudinally within the rear portion 5 of the casing.
  • the motor unit has an armature whose axis of rotation lies along the longitudinal axis of the rear portion 5.
  • the motor unit is a commutator motor, the commutator end of the motor being located adjacent the switch 20.
  • the armature shaft 27 of the motor is operatively connected to a drive transmission system and extends through bearings 28 carried by a support bracket 29 secured to the forward end of the motor unit by screws 30 (Fig. 6).
  • the bracket 29 has an arm 3l with an integral tubular extension 32 carrying a bearing 33.
  • the arm 3l is also formed at 34 to accommodate a thrust ring 35 and a ball bearing race 36.
  • Bearing 33 supports the reduced diameter end of a shaft 37 carrying a bevel pinion 38 in mesh with a bevel gear 39 secured to the end of the armature shaft 27 as shown in Fig. 4.
  • the upper face of the pinion 38 is in contact with the ball bearings of the race 36 which thus supports axial loads along the shaft 37.
  • the larger diameter lower end (as seen in Fig. 4) of shaft 37 has a pin 40 projecting from its lower race, the pin being located eccentrically of the axis of rotation of the shaft 37.
  • Pin 40 extends into a tubular roller 41 stepped externally to seat upon the upper edge of a liner element 42 seated in a drive member 43 secured to a reciprocable shaft 44 described in more detail below.
  • the shaft 44 is supported for reciprocatory movement in slots in cylindrical sintered bearings 45 held between upper and lower support structures 46 and 47. Secured to the forward end of the shaft 44 is a clamp 48 by which a cutting tool to be descrihed below can he secured to the shaft for reciprocation therewith. The tool projects from the front of the guard 12 through the aperture 12 a therein.
  • the upper support structure 46 is shown in Figs. 7-11. It comprises a cast metal frame of generally rectangular shape when seen in plan as in Fig. 7. End members 49 of the frame are contoured to provide curved support surfaces 50 for the bearings 45 and guides 51 for the shaft 44. The end members 49 extend sideways to form ears 52 each of which has a hole 53 for a fixing screw not shown. From the upper faces of the side members 49 project U-shaped prongs 54 which serve to locate the support structure and which engage internal surfaces (not shown) on the body halves 2, 3.
  • the lower support structure 47 also a metal casting, is shown in Figs. l2-l5.
  • structure 47 is also of generally rectangular form, is sized to match structure 46, and has curved lower support surfaces 55 for bearings 45 and with guides 56 for shaft 45.
  • the structure 47 has ears 57 in positions corresponding with ears 52 of structure 46. Each ear 57 has a hole 58.
  • Shaft 44 is shown in more detail in Figs. l6-l8 and it consists of a metal strip with slots 60 in its side walls about midway of the length of the strip and screw holes 6l close to one end.
  • the holes 6l are staggered and between them on one face of the strip is a narrow slot 62.
  • the drive member 43 Moulded on to the strip in a position allowing it to key into the slots 60 is the drive member 43 which is of a plastics material.
  • the upper face of the drive member 43 visible in Fig. l8, has a central elongate cavity 63 lying transverse to the length of the strip 44.
  • the inner element 42 referred to above seats in the cavity 63 as is shown in Fig. 4.
  • clamp 48 (Fig. l9) Attached at one end of the shaft 44 is clamp 48 (Fig. l9).
  • the clamp comprises a U-shaped block.
  • the base 65 of the block has holes 66 for screws 67 by means of which the clamp is secured to the shaft.
  • the ends of the limbs of the U are stepped as at 68 so that they seat on the edge of the strip.
  • the support structures 44 and 46 house the bearings 45 and are secured together by screws through the holes in the ears referred to above.
  • the shaft 44 is located in the slots in the bearings 45 and is orientated so that the end carrying the clamp 48 is adjacent the front end wall of the tool casing and the longitudinal axis of the shaft is aligned with the hole in the front face of the casing and the hole l2 a .
  • the facing surfaces of the body halves are contoured to provide, when the halves are placed together a compartment 69 housing the support structures 44, 46 and dividing walls 70 that separate those structures of the spur gear 39 and pinion 38. This reduces the tendency for lubricants to migrate from the gears to the compartment 69.
  • Switch 20 has an actuating plunger 7l, movement of which to actuate the switch contacts is controlled by a slide 72 that extends, inside the tool casing, from the slide button l9.
  • the slide 72 has a cam surface 73 shaped to depress the plunger 7l when the slide button l9 is moved in one direction and allows the plunger to restore when moved in the other direction.
  • the slide 72 is supported by guide surfaces formed on the facing inner surfaces of the body halves.
  • the switch 20 is supported in a similar manner.
  • an opening 74 aligned with the clamp screws.
  • the opening 72 is normally closed by the slide l8 referred to above. To expose the opening, the slide l8 is moved forwardly.
  • the tool can be used for a variety of cutting purposes for each of which a particular cutter is used. Examples of cutters are shown in Figs. 20-23.
  • the cutter shown in Fig. 20 has a stem 75 by which it is clamped to the shaft 44 in the manner described above. From the stem 76 extends a blade 76 having a cutting knife edge 77 along its length. As can be seen from Fig. 20, the blade 76 is also downwardly inclined slightly and it includes a root portion 78 whose edge 79 curves upwardly (as seen in Fig. 20) with respect to the remainder 80 of the blade which is substantially straight. The knife edge 77 extends along the edge of the root portion 78 over which the edge 77 faces away from the stem 75.
  • a user moves the slide l8 to expose the opening 74 and thereby to gain access to the screws 67.
  • the cutter is then entered, stem 75 first, through the opening l2 a in the guard l2 and the stem engaged, edge on, in the slot 62. Screws 67 are then tightened to clamp the stem in the slot 62.
  • the speed of rotation of the shaft 27 in con­junction with the reduction ratio between gears 38 and 93, the "throw" of the eccentricity of pin 40 are such that cutter reciprocates at a rate of about l0,000 move­ments per minute with a stroke of about 8 mm.
  • a movement is defined as a forward and backward action of the cutter.
  • That high speed of reciprocation combined with the short stroke produces a rapid cutting action with little or no vibration of the tool.
  • the cutter shown in Fig. 20 recip­rocates to and from as indicated by the arrow 8l so that the edge 79 lies substantially at right angles to the direction of reciprocation.
  • the sheet is placed on a flat surface and the blade part 80 inserted beneath the sheet.
  • the cutter is moved towards the edge of the sheet which is contacted by the edge 79 which is reciprocating towards and away from that edge. Slight pressure is exerted to move the edge 79 into the sheet which is cut principally by that edge which because of its movement towards and away from the edge does not produce the flexing of the sheet that would be produced if the edge 79 were moved transversely of the edge of the material.
  • Cutting is assisted by the edge 77 on the part 80 but again, because of the inclination thereof with respect to the direction of reciprocation, no flexing or movement of the sheet results.
  • the cutter shown in Fig. 2l has a stem 82 by which the cutter is clamped to the shaft 44 using the clamp 48. From the stem 82 extends a U-shaped jaw 83 with a cutting knife edge round the curved base or root of the limbs of the U as indicated at 84 and along the inner edges of blades 85 which form those limbs. The cutting knife edge 86 of the blades 85 are tapered towards the mouth of the U as indicated at 87. Knife edge 84 faces away from the stem 82.
  • the cutter shown in Fig. 2l is reciprocated to and fro as indicated by the arrow 8l in Fig. 20, the curved knife edge 84 thus lying substantially at right angles to the direction of reciprocation.
  • the cutter shown in Fig. 2l is also used to cut flexible materials.
  • the edge of a sheet of the material to be cut is entered between the jaws and the tool switched on.
  • the rapid reciprocation of the knife edge 84 of the cutter and the short stroke produces a rapid cutting action which does not produce bending or flexing of the sheet of material.
  • Knife edges 86 assist in guiding the cutter along a cutting line.
  • the blade shown in Fig. 22 has a stem 88 and a U-shaped jaw 89.
  • the jaw has parallel cutting knife edges 90 on the inside edges of the blade 9l that form the limbs of the U and arcuate cutting knife edges 92 at the roots of the blades which form the base of the U. Knife edges 92, at least over a substantial part of their length face away from the stem 88.
  • Material to be cut is fed into the jaws and cut by the to and fro reciprocation of the edges 92.
  • the knife edges 92 are inclined to the direction of recip­rocation of the cutting blade which is that indicated by arrow 8l in Fig. 20.
  • the cutting blade shown in Fig. 23 has a stem 93 and a U-shaped jaw 94.
  • Short parallel cutting knife edges 95 are formed at the outer ends of the facing edges of the blades 96 that constitute the limbs of the U whilst longer converging cutting knife edges 97 are formed over the roots of those facing edges.
  • Cutting is performed by the rapid reciprocation of the knife edges 97 towards and away from the edge of the surface to be cut.
  • Those edges face away from the stem 93 and are inclined to the direction of reciprocation of the cutter which is that indicated by arrow 8l in Fig. 20.
  • a motor control circuit can be pro­vided to give a two speed operation of the motor. For example, a higher speed giving the l0,000 reciprocatory movements mentioned above and a lower speed giving 8,500 such movements. The user is then able to select the speed best suited to the cutting he requires to do. In both cases, a stroke of 8 mm is used.
  • a range of from 8,500 to l0,000 recip­rocatory movements per minute is used.
  • the stroke of the cutting tool can also be varied somewhat from the value of 8 mm referred to above.
  • the stroke may lie within the range of from 4-l2 mm but preferably in the range of from 6-l0 mm.
  • the tool does not have to be hand-held, it can be mounted upon a stand for use as a stationary tool upon a bench or other work surface, the material to be cut being fed to the tool.
  • the cutters described above may be used to cut carpets, carpet tiles, vinyl type floor coverings, plastics sheeting, rubber sheeting and cloth and other flexible materials.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Knives (AREA)
EP19860307007 1985-09-23 1986-09-11 Lame Withdrawn EP0216575A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8523426 1985-09-23
GB858523426A GB8523426D0 (en) 1985-09-23 1985-09-23 Cutting blades

Publications (1)

Publication Number Publication Date
EP0216575A1 true EP0216575A1 (fr) 1987-04-01

Family

ID=10585585

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860307007 Withdrawn EP0216575A1 (fr) 1985-09-23 1986-09-11 Lame

Country Status (2)

Country Link
EP (1) EP0216575A1 (fr)
GB (1) GB8523426D0 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH16746A (de) * 1898-06-01 1899-01-31 Otto Hofmann Metzgereigerät zum Halten von zu sägenden Knochen
US1843223A (en) * 1930-05-20 1932-02-02 Gustave A Hasseler Knife
DE708923C (de) * 1940-04-13 1941-08-02 Joseph Berens Enthaeutemesser
AT256662B (de) * 1963-07-29 1967-09-11 Gen Electric Schneidmesser mit Motorantrieb
DE1255532B (de) * 1965-04-07 1967-11-30 Willy Ufer Kraftbetriebene Schneidvorrichtung, insbesondere zum Abloesen von Fleisch von Knochen

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH16746A (de) * 1898-06-01 1899-01-31 Otto Hofmann Metzgereigerät zum Halten von zu sägenden Knochen
US1843223A (en) * 1930-05-20 1932-02-02 Gustave A Hasseler Knife
DE708923C (de) * 1940-04-13 1941-08-02 Joseph Berens Enthaeutemesser
AT256662B (de) * 1963-07-29 1967-09-11 Gen Electric Schneidmesser mit Motorantrieb
DE1255532B (de) * 1965-04-07 1967-11-30 Willy Ufer Kraftbetriebene Schneidvorrichtung, insbesondere zum Abloesen von Fleisch von Knochen

Also Published As

Publication number Publication date
GB8523426D0 (en) 1985-10-30

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19870928

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Effective date: 19881125

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Effective date: 19890406

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Inventor name: BEVERIDGE, ROGER JUSTIN