Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
  • B23D61/006—Oscillating saw blades
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
  • A61F15/00—Auxiliary appliances for wound dressings; Dispensing containers for dressings or bandages
  • A61F15/02—Devices for cutting bandages of any kind, e.g. shears, cast-cutting saws
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D61/00—Tools for sawing machines or sawing devices; Clamping devices for these tools
  • B23D61/02—Circular saw blades
  • B23D61/025—Details of saw blade body
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
  • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
  • B23D65/00—Making tools for sawing machines or sawing devices for use in cutting any kind of material

Definitions

• the invention relates to a method of tools suitable for separating cuts, in particular to saw blades for an oscillating saw for use in the medical-technical and industrial field, and to tools produced by the method.
• Saw blades for operation with an oscillating saw are used in particular for the processing of plastic-gypsum mixtures, from which very hard gypsum casts are produced, which have to be removed again by separating the gypsum cast.
• the plastic-gypsum mixture places great demands on the saw blade, because this material tends to build up too much heat when it is cut and the cutting channel behind the saw blade tries to close again, so that great friction is generated by excessive friction.
• the person operating such a saw has to work extremely carefully in order to avoid burns to the skin under a plaster cast, especially since the operator cannot recognize the existing thickness of a plaster cast from the outside, so that the possible on-the-spot position -Saw the heat development is particularly encouraged.
• a circular saw blade performing an oscillating movement is used to cut through a plaster cast in the direction perpendicular to its surface, in which case there is a particularly great risk of injury to the skin underneath.
• the object on which the present invention was based was to produce saw blades of the aforementioned type in a particularly efficient manner, so that very low production costs practically permit single use, and also to produce the saw blades in such a way that the development of heat resulted from the shape is practically irrelevant and the other aforementioned sources of danger are eliminated, and finally the shape should also enable another sawing technique to be used with a separating cut that continues in the direction of the cut, without the risk of injury to the skin even when the cut is made very deeply can.
• annular disk which is preferably provided with a toothing on the circumference and as Circular saw blade is available, and this disc can be provided as a whole on both sides with a fillet that begins in the area of the outer tooth cutting edges and extends radially inward beyond the tooth root line, so that the unrestricted teeth immediately adjoin the outer one Zahnkopf ⁇ surface itself so that there is hardly any cutting heat due to very low friction.
• a plurality of saw blades can then be separated from this disk, the individual saw blade being able to be given the desired, essentially circular sector-shaped outline shape at the same time, and at the same time an edge incision is also made for clamping the saw blade on the oscillating saw.
• a circular saw blade can also be assumed for the manufacture of the saw blades, which already has a hollow grinding on both sides, as a result of which the saw blade body tapers from the outer edge to the center, which then also applies to the individual saw blades produced from the circular saw blade .
• a circular saw blade having parallel flat surfaces can also be provided with such a hollow grinding prior to the manufacture of the fillet. 4
• the individual saw blades are cut out of the circular disk with a toothing on the circumference by means of a laser beam.
• an incision is made at the fastening end of the saw blade for clamping the saw blade on the oscillating saw and at the same time the bulky outline shape of the saw blade is produced, which is the widest at a distance from the tooth edge and from this widest section to the tooth edge rounded narrow sides which allows the saw blade to be used at an angle in the feed direction, so that the aforementioned rounded narrow side with respect to a plaster cast to be severed faces the skin underneath, thus preventing injury to the skin from the saw blade.
• an elongated recess penetrating the saw blade is also produced for each saw blade inwards from the toothing edge at a distance therefrom, which recess is preferably still in the region of the fillet.
• This recess has various functions such as reducing the weight, preventing heating due to frictional heat and improving the removal of the gypsum dust generated by the sawing.
• a circularly toothed disk with a toothing on the circumference with all teeth formed on the center of the tooth and extending over part of the tooth height, two rows of partial teeth are formed.
• This incision can be V-shaped or U-shaped and separates each tooth into two partial teeth lying next to one another, which achieves a new type of cut in which the material to be cut breaks out to a large extent in small pieces, so that. correspondingly less gypsum dust arises.
• the material cannot paste up or melt during sawing and there is no undesired heating.
• Figure 1 is an annular disc with toothing nd nd in plan view.
• FIG. 2 shows a cross section through the disc along the line 2-2 in Fig. 1.
• FIG 3 shows a cross section through a disc provided with a double-sided hollow grinding.
• FIG. 4 shows the pane according to FIG. 3 with an additional fillet on both sides;
• FIG. 5 shows on a larger scale a partial section of the disk in which the teeth are provided with a V-shaped incision
• FIG. 6 is a plan view of the toothed peripheral surface of the disk according to FIG. 5;
• FIG. 7 shows a saw blade on the scale of FIGS. 5 and 6 in a narrow side view; 8 on a smaller scale a plurality of saw blades that can be produced from a disk;
• Figure 10 shows the application of the saw blade in the cutting section.
• 11 and 12 top view and Be enansicht another embodiment of a disc from which saw blades are made.
• the starting point is an annular disk 1 shown in FIG. 1 with a toothing 2 on the circumference, which is also available as a circular saw blade, finished in the * trade.
• this disk 1 can have two plane-parallel side surfaces 3.
• the disc 1 can also be provided with a hollow grinding 4 on both sides, as a result of which the disc tapers from the outer toothing edge 2 to the center. Either the circular saw blade already has this hollow grinding, or the disc is provided with the hollow grinding 4 on both sides.
• the saw blade to be produced obtains the special properties from a groove 5 according to FIG. 4 formed on both sides of the disc 1, which is produced by grinding the disc 1.
• This fillet 5 has its outer boundary on the outer tooth cutting edge and extends radially inward beyond the tooth root line. Through this on both sides, fillets 5, the teeth become continuously narrower immediately following the tooth tip surface towards the tooth base. With this fillet 5, the special advantages described above are achieved, while the hollow grinding 4 can also be dispensed with on both sides. Consequently, the fillet 5 can also be formed on the plane-parallel disk 1 according to FIG. 2, which is shown in FIG. 2 with dashed lines.
• the pane 1 has a width of 0.5 mm, for example, the depth of the fillet 5 is approximately 0.15 mm, so that the width of the pane 1 is still 0.2 mm at the narrowest point. With this thinning, the stability is not yet impaired, but you can achieve a very easy penetration of the saw blade into the material to be cut.
• an incision 6 which extends radially inward over part of the tooth height for each tooth over part of the tooth height, is formed on the outer circumference of the disk provided with the toothing 2, 7 is V-shaped but can also be U-shaped.
• the lower edge 7 of this incision 6 lies at a distance above the base line 8 of the teeth forming the toothing 2, so that such an incision 6 is present in each tooth and lower portions of the original tooth flanks remain.
• the incision 6 creates two Rows of partial teeth 9 and 10, which first cut through the material to be cut, while a rest of the material still remains in between. When the saw blade penetrates deeper, the teeth fully engage and the remaining material is thrown out piece by piece, which has the advantage that less dust is generated.
• the saw blades 12 are cut out of the circular disc 1 according to FIG. 8. Since the circular saw blade 1 is a hardened body which is very thin in terms of the material thickness, the saw blades 12 are preferably cut out of the disk 1 by means of a laser beam. At the same time, an edge cutout 13 for clamping the saw blade in the oscillating saw is formed for each saw blade 12 on the edge opposite the toothing 2. Furthermore, two arcuate rounded sections 14 are formed on the two opposite narrow edges and end in the toothing 2. With this rounded outer contour 14, it is possible to use the saw blade as shown in FIG. 10.
• the arrow 15 indicates the direction of movement when cutting through a material 16 to be cut.
• the continuous separating cut in the direction of arrow 17 on the right side of FIG. 10 it is then possible to work with an inclined position at an angle of 30-40.
• this new sawing technique is possible because one of the arcuately rounded sections 14 on the saw blade 12 is at the bottom, where he cuts the material 16 to be separated, for example consisting of a plaster cast, into contact with the body skin underneath without the risk of injury can come.
• the progressive separating cut in the direction of arrow 17 it is avoided that sawing takes place on the spot. This disadvantage which occurs with previously known saw blades leads to rapid heating with the risk of burns and also injury to the skin.
• the rounded sections 14 of the saw blade 12 on both sides right-handers and left-handers can use the new sawing technique.
• the fillets 5 on both sides and additionally also the tapering of the material thickness of the disk towards its center are produced by cold forming by means of deformation tools acting against both sides of the disk. The hardening then takes place .
• the saw blades with an oscillating movement are also particularly suitable for separating very firm synthetic cast bandages.
• tools with a cutting edge instead of the teeth can also be produced according to the same principle as the manufacture of the saw blades described above. This can be done in such a way that a cutting edge that is ground on one or both sides is formed on the existing teeth, or there may be a continuous cutting edge. With the oscillating movement, such a tool is suitable for cutting in many areas in the industrial sector, for example for textiles or for cutting plastic material.
• the teeth of a saw blade can be additionally reinforced, in particular for industrial use, with a diamond coating, titanium or hard metal.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Health & Medical Sciences (AREA)
• Epidemiology (AREA)
• Biomedical Technology (AREA)
• Heart & Thoracic Surgery (AREA)
• Vascular Medicine (AREA)
• Life Sciences & Earth Sciences (AREA)
• Animal Behavior & Ethology (AREA)
• General Health & Medical Sciences (AREA)
• Public Health (AREA)
• Veterinary Medicine (AREA)
• Sawing (AREA)
• Polishing Bodies And Polishing Tools (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=4209047

Family Applications (1)

Country Status (2)

Cited By (2)

Families Citing this family (2)

Citations (9)

• 1988
  • 1988-04-14 CH CH137988A patent/CH676198A5/de not_active IP Right Cessation
• 1989
  • 1989-03-31 WO PCT/CH1989/000065 patent/WO1989009671A1/de unknown

Patent Citations (9)

Non-Patent Citations (2)

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