FR2518395A1 - Ductile thermoplastic handles for standard metal knife blades - to permit cold forging for anchoring blade - Google Patents
Ductile thermoplastic handles for standard metal knife blades - to permit cold forging for anchoring blade Download PDFInfo
- Publication number
- FR2518395A1 FR2518395A1 FR8124007A FR8124007A FR2518395A1 FR 2518395 A1 FR2518395 A1 FR 2518395A1 FR 8124007 A FR8124007 A FR 8124007A FR 8124007 A FR8124007 A FR 8124007A FR 2518395 A1 FR2518395 A1 FR 2518395A1
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- France
- Prior art keywords
- blade
- polystyrene
- projection
- handle
- thermoplastic material
- 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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- 229920001169 thermoplastic Polymers 0.000 title claims abstract description 5
- 239000004416 thermosoftening plastic Substances 0.000 title claims abstract description 5
- 239000002184 metal Substances 0.000 title claims description 17
- 238000004873 anchoring Methods 0.000 title 1
- 238000010273 cold forging Methods 0.000 title 1
- 239000004793 Polystyrene Substances 0.000 claims abstract description 22
- 229920002223 polystyrene Polymers 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 27
- 239000012815 thermoplastic material Substances 0.000 claims description 18
- 229920005990 polystyrene resin Polymers 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 2
- 229910001338 liquidmetal Inorganic materials 0.000 claims 1
- 150000002825 nitriles Chemical class 0.000 claims 1
- 230000000712 assembly Effects 0.000 abstract 1
- 238000000429 assembly Methods 0.000 abstract 1
- 239000013078 crystal Substances 0.000 abstract 1
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- NLHHRLWOUZZQLW-UHFFFAOYSA-N Acrylonitrile Chemical compound C=CC#N NLHHRLWOUZZQLW-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000007731 hot pressing Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods
- A61B17/32—Surgical cutting instruments
- A61B17/3209—Incision instruments
- A61B17/3211—Surgical scalpels, knives; Accessories therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/60—Riveting or staking
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/56—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using mechanical means or mechanical connections, e.g. form-fits
- B29C65/64—Joining a non-plastics element to a plastics element, e.g. by force
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/50—General aspects of joining tubular articles; General aspects of joining long products, i.e. bars or profiled elements; General aspects of joining single elements to tubular articles, hollow articles or bars; General aspects of joining several hollow-preforms to form hollow or tubular articles
- B29C66/51—Joining tubular articles, profiled elements or bars; Joining single elements to tubular articles, hollow articles or bars; Joining several hollow-preforms to form hollow or tubular articles
- B29C66/53—Joining single elements to tubular articles, hollow articles or bars
- B29C66/532—Joining single elements to the wall of tubular articles, hollow articles or bars
- B29C66/5326—Joining single elements to the wall of tubular articles, hollow articles or bars said single elements being substantially flat
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
- B29C66/712—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined the composition of one of the parts to be joined being different from the composition of the other part
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
- B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/74—Joining plastics material to non-plastics material
- B29C66/742—Joining plastics material to non-plastics material to metals or their alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
- B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
- B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
- B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/84—Specific machine types or machines suitable for specific applications
- B29C66/843—Machines for making separate joints at the same time in different planes; Machines for making separate joints at the same time mounted in parallel or in series
- B29C66/8432—Machines for making separate joints at the same time mounted in parallel or in series
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
- B29C66/71—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the composition of the plastics material of the parts to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/72—Cutting equipment, e.g. punches
- B29L2031/7202—Knives
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/753—Medical equipment; Accessories therefor
- B29L2031/7546—Surgical equipment
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Surgery (AREA)
- Biomedical Technology (AREA)
- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Heart & Thoracic Surgery (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
Description
Procédé de fixation d'une pièce métallique sur une
Pièce en matière thermoplastique, notamment d'une lame d'instrument tranchant tel que bistouri, cutter ou ana boue sur le manche de cet instrument, et instrument obtenu par ce procédé.Method of fixing a metal part to a
Part made of thermoplastic material, in particular a blade of a sharp instrument such as a scalpel, cutter or ana mud on the handle of this instrument, and instrument obtained by this process.
La présente invention concerne un procédé-de fixation d'une pièce métallique sur une pièce en matière thermoplastique, notamment d'une lame d'instrument tranchant tel que bistouri, cutter ou analogue sur le manche de cet instrument, ainsi qu'un instrument obtenu par ce procédé, procédé selon lequel, ladite pièce métallique comportant une ouverture, on élabore, sur la partie de pièce en matière thermoplastique qui doit recevoir ladite pièce métallique, une saillie d'épaisseur supérieure à celle de ladite pièce métallique dans sa partie bordant ladite ouverture, cette saillie étant adaptée à y pénétrer, et on pose ladite# pièce métallique sur ladite partie de pièce thermoplastique de sorte que son ouverture s'engage exactement sur ladite saillie. The present invention relates to a method of fixing a metal part to a part made of thermoplastic material, in particular a blade of a sharp instrument such as a scalpel, cutter or the like on the handle of this instrument, as well as an instrument obtained. by this method, method according to which, said metal part comprising an opening, a projection of thickness greater than that of said metal part in its part bordering said part is produced on the part of part made of thermoplastic material which is to receive said metal part opening, this projection being adapted to penetrate therein, and said # metal part is placed on said part of thermoplastic part so that its opening engages exactly on said projection.
Il s'agit en principe d'un procédé destinéàassurer une-fixation définitive de la pièce métallique en question sur un manche ou autre pièce en matière thermoplastique. It is in principle a process intended to ensure a definitive fixing of the metal part in question on a handle or other part made of thermoplastic material.
On connalt déjà plusieurs types de procédés élaborés à cet effet et type général comportant les deux opérations définies ci-dessus. We already know several types of processes developed for this purpose and general type comprising the two operations defined above.
Selon certains de ces procédés, on opère par fixation mécanique, à savoir que l'on insère dans ladite saillie une pièce supplémentaire qui vient coiffer et presser les bords de l'ouverture de ladite pièce métallique. Cependant l'élaboration de cette petite pièce de fixation nécessite bien entendu une opération de moulage supplémentaire, et sa fixation sur la saillie -est. relativement délicate, en raison des faibles dimensions de celle-ci, ce qui rend ce procédé coûteux et incommode, surtout lorsque l'on désire assurer les fixations en grandes séries. According to some of these methods, one operates by mechanical fixing, namely that one inserts into said projection an additional piece which comes to cap and press the edges of the opening of said metal piece. However, the development of this small fixing part obviously requires an additional molding operation, and its fixing to the projection -is. relatively delicate, due to the small dimensions thereof, which makes this process expensive and inconvenient, especially when it is desired to secure the fastenings in large series.
Dans d'autres procédés, on effectue un pressage à chaud de la partie dépassante de la saillie, pour la rabattre sur la lame, mais le réglage de la température est délicat et ce type de procédé ne donne pas entièrement satisfaction, surtout quant à la régularité de la fixation et à son aspect. In other methods, a hot pressing of the protruding part of the projection is carried out, in order to fold it back onto the blade, but the temperature adjustment is delicate and this type of method is not entirely satisfactory, especially as regards the regularity of the fixation and its appearance.
Dans d'autres procédés encore, l'étalement localisé de la matière thermoplastique de la saillie sur la pièce métallique est obtenu au moyen d'ultrasons, mais le produit obtenu n'est là encore pas exempt de défauts. Notamment, des bavures apparaissent alors sur le pourtour de ladite saillie, entre celle-ci et la lame, ce qui est-fortement indésirable,surtout lorsque l'instrument tranchant en question est un bistouri. In still other methods, the localized spreading of the thermoplastic material of the projection on the metal part is obtained by means of ultrasound, but the product obtained is again not free from defects. In particular, burrs then appear on the periphery of said projection, between the latter and the blade, which is highly undesirable, especially when the cutting instrument in question is a scalpel.
Le but de la présente invention est d'élaborer un nouveau procédé, qui élimine tous ces inconvénients. The object of the present invention is to develop a new method, which eliminates all these drawbacks.
Pour ce faire, selon l'invention, on choisit une matière thermoplastique se prêtant particulièrement bien à une opération d'estampage, et l'on écrase localement et à froid ladite saillie, pour qu'au moins une partie de sa surface déborde sur. ladite pièce métallique. To do this, according to the invention, a thermoplastic material is chosen which is particularly suitable for a stamping operation, and the said projection is locally and cold crushed, so that at least part of its surface projects over. said metal part.
Un tel procédé permet d'obtenir facilement et rapidement, par exemple à l'aide d'une presse hydraulique équipée d'un poinçon de forme appropriée, une fixation très solide et d'excellent aspect, sans aucune bavure, d'une pièce métallique sur une pièce en matière thermoplastique. Such a method makes it possible to easily and quickly obtain, for example using a hydraulic press equipped with a punch of suitable shape, a very solid and excellent appearance fixing, without any burr, of a metal part. on a piece of thermoplastic material.
Cette opération peut étre assurée à grande cadence, car le poinçon peut estamper plusieurs pièces dans un seul mouvement de pressage. En outre, cette opération de fixation peut être facilement automatisée, au moins quant à l'opération de pressage proprement dite, et l'on peut aussi contrôler et réguler aisément la pression d'estampage. This operation can be carried out at high speed, since the punch can stamp several pieces in a single pressing movement. In addition, this fixing operation can be easily automated, at least as regards the pressing operation proper, and it is also possible to easily control and regulate the stamping pressure.
On pourra prévoir par exemple, et ceci-pour-limiter la pression d'estampage nécessaire, que l'on écrase ladite saillie en seulement deux emplacements localisés. We can provide for example, and this-to limit the necessary stamping pressure, that one overwrites said projection in only two localized locations.
Un procédé conforme à l'invention; mis en-oeuvre avec une pièce métallique, notamment une lame de bistouri ou analogue, dont l'ouverture est essentiellement allongée -dans la direction de la grande dimention de la# lame-, pourra donc encore etre caractérisé en ce que les emplacements d'écrasement de ladite saillie -laquell-e.est alors également allongée- sont situés aux extrémités ou à -pro- ximité des extrémités de cette dernière, lesquelles pre, sentent à cet effet des surépaisseurs. Lessurépaisseurs permettront un bon transfert de la matière par aplatisse ment, à la manière d'un rivetage, # sur les bords de l'ou- verture de la lame. A method according to the invention; implemented with a metal part, in particular a scalpel blade or the like, the opening of which is essentially elongated - in the direction of the large dimension of the # blade -, can therefore still be characterized in that the locations of crushing of said projection -which is then also elongated- are located at the ends or near the ends of the latter, which pre, feel for this purpose extra thickness. The thickeners will allow good transfer of the material by flattening, like riveting, # on the edges of the blade opening.
Le choix de la matière thermoplastique, pour la constitution du manche ou analogue de l'instrument en question, est très important pour l'obtention d'une fixation satisfaisante à tous les points de vue -résistance mécanique, aspect, absence de bavures, de criques ou autres défauts ; à cet effet, conformément à un autre aspect de la présente invention, on utilisera essentiellement une matière choisie parmi les résines polystyrèniques, notamment soit du polystyrène soit un mélange de polystyrène standard et de polystyrène choc contenant du butadiène. The choice of the thermoplastic material, for the constitution of the handle or the like of the instrument in question, is very important for obtaining a satisfactory fixing from all points of view - mechanical strength, appearance, absence of burrs, cracks or other defects; for this purpose, in accordance with another aspect of the present invention, essentially a material chosen from polystyrene resins will be used, in particular either polystyrene or a mixture of standard polystyrene and impact polystyrene containing butadiene.
Il s'agit là de produits bon marché et particulière- ment aptes à subir un estampage. These are inexpensive products and particularly suitable for being stamped.
La présence du polystyrène choc en mélange avec le polystyrène standard permettra de diminuer de façon adéquate le caractère cassant du polystyrène standard, autrement dit de donner une certaine souplesse à la matière thermoplastique. The presence of impact polystyrene in admixture with standard polystyrene will make it possible to adequately reduce the brittle nature of standard polystyrene, in other words to give a certain flexibility to the thermoplastic material.
De préférence, on prévoiera que le polystyrèùe standard utilise est présent dans une proportion pondérale allant d'environ 85 à environ 95 % du poids total de ladite matière thermoplastique, le polystyrène choc étant présent dans la proportion complémentaire, à savoir d'environ 5 à 15 % du poids total. Il est très impor#tant que ces proportions soient respectées. Preferably, it will be provided that the standard polystyrene used is present in a proportion by weight ranging from approximately 85 to approximately 95% of the total weight of said thermoplastic material, the impact polystyrene being present in the additional proportion, namely from approximately 5 to 15% of the total weight. It is very important as long as these proportions are respected.
On a, -après avoir procédé à de multiples essais, constaté qu'il était plus particulièrement avantageux de prévoir que les proportions pondérales de polystyrène standard et de polystyrène choc sont respectivement d'environ 90 % et d'environ 10 %, proportions que l'on peut pratiquement considérer comme optimAles. After having carried out multiple tests, it has been found that it is more particularly advantageous to provide that the weight proportions of standard polystyrene and impact polystyrene are approximately 90% and approximately 10% respectively, proportions that l 'can practically be considered optimal.
A titre de variante, on peut encore envisager l'utilisation d'autres résines de la même famille, et notamment le pol y (styrène/butadiène/acrylonitrile) (par #abréviation
ABS), avec toutefois l'inconvénient d'un prix de revient plus élevé.Alternatively, one can also consider the use of other resins of the same family, and in particular pol y (styrene / butadiene / acrylonitrile) (by # abbreviation
ABS), but with the disadvantage of a higher cost price.
Un mode d'exécution de 11 invention va maintenant être décrit à titre d'exemple nullement limitatif, avec réé- rence aux figures du dessin annexé, dans lequel
- la figure 1 est une vue en plan de dessus du manche en matière thermoplastique d'un instrument tranchant éla boré conformément à 11 invention
- la figure 2-est une vue en coupe selon la ligne Il-Il de la figure 1
- la figure 3 montre en plan trois instruments tranchants pendant le processus d'estampage, le poinçon de la presse étant représenté en trait spectral ; et
- la figure 4 est une vue de profil du poinçon d'estampage.An embodiment of the invention will now be described by way of non-limiting example, with reference to the figures of the appended drawing, in which
- Figure 1 is a top plan view of the thermoplastic handle of a sharpened instrument prepared in accordance with the invention
- Figure 2-is a sectional view along the line Il-Il of Figure 1
- Figure 3 shows in plan three cutting instruments during the stamping process, the punch of the press being shown in spectral line; and
- Figure 4 is a side view of the stamping punch.
La pièce de matière thermoplastique sur laquelle il y a lieu de fixer une pièce métallique, par exemple une lame tranchante 1, est, dans l'application décrite ici à titre illustratif, un manche de bistouri 2. Cette lame, comme connu, comporte une ouverture centrale allongée 3, et le manche 2 est moulé avec, sur son extrémité 4 qui est destinée à recevoir la lame, une saillie allongée 5 apte à venir s'engager exactement dans ladite ouverture 3. The piece of thermoplastic material on which it is necessary to fix a metal piece, for example a sharp blade 1, is, in the application described here for illustration, a scalpel handle 2. This blade, as known, comprises a elongated central opening 3, and the handle 2 is molded with, on its end 4 which is intended to receive the blade, an elongated projection 5 capable of coming to engage exactly in said opening 3.
Comme visible sur la figure 2, la saillie 5 porte à ses extrémités des surépaisseurs 6. As can be seen in FIG. 2, the projection 5 carries at its ends extra thicknesses 6.
Ledit manche 1 est de préférence constituéde 90 % en poids de polystyrène standard, et de l0 % en poids de polystyrène choc contenant du butadiène. On pourrait utiliser également de l'ABS. Ces matières thermoplastiques, de la famille des polymères styréniques, ont d'excellentes qualités d'aspect, de légèr#té, de résistance au choc, de résistance aux agents chimiques; et présentent en outre un caractère antistatique et une bonne rigidité, toutes qualités particulièrement intéressantes pour la constitu tion d'un manche de bistouri. Said sleeve 1 preferably consists of 90% by weight of standard polystyrene, and 10% by weight of impact polystyrene containing butadiene. ABS could also be used. These thermoplastic materials, from the family of styrenic polymers, have excellent qualities of appearance, lightness, impact resistance, resistance to chemical agents; and also have an antistatic character and good rigidity, all qualities particularly advantageous for the constitution of a scalpel handle.
En outre, elles se prêtent particulièrement bien à une opération d'estampage à froid. In addition, they are particularly suitable for a cold stamping operation.
Cette opération peut être menée à bien grâce à une presse, par exemple hydraulique, faisant descendre un poinçon sur les surépaisseurs 6 pour les écraser et les faire déborder, à la manière de têtes de rivets, sur les bords des extrémités de l'ouverture 3 de la lame. This operation can be carried out thanks to a press, for example a hydraulic press, lowering a punch on the extra thicknesses 6 to crush them and cause them to overflow, like rivet heads, on the edges of the ends of the opening 3 of the blade.
La forme du profil d'un poinçon utilisable à cet effet a été représentée en 7 à la figure 4. On prévoit un poinçon 7 assez long pour pouvoir sertir plusieurs lames à la fois, par exemple trois, comme montré à la figure 3. The shape of the profile of a punch usable for this purpose has been represented at 7 in FIG. 4. A punch 7 is provided long enough to be able to crimp several blades at the same time, for example three, as shown in FIG. 3.
Les parties de matière thermoplastique aplaties et élargies à lamanière de têtes de rivets par les saillies 8 du poinçon 7 ont été référencées en 9. L'aspect du s-ertis- sage ainsi obtenu est parfait et sans aucune bavure.The parts of thermoplastic material flattened and widened to the thimble of rivet heads by the projections 8 of the punch 7 have been referenced at 9. The appearance of the setting thus obtained is perfect and without any burr.
A titre indicatif, la force d'estampage est de 400 daN environ. Avec une machine semi-automatique sur laquelle seules les opérations de pose des lames 1 sur les parties 4 et d'enlèvement des bistouris finis sont faites à la main, la descente contrôlée et la remontée du poin çon étant automatiques, on peut obtenir une cadence de production d'environ 2 200 pièces à l'heure, avec un rebut pratiquement inexistant. As an indication, the stamping force is approximately 400 daN. With a semi-automatic machine on which only the operations of laying the blades 1 on the parts 4 and removing the finished scalpels are done by hand, the controlled descent and the ascent of the punch being automatic, a rate can be obtained production of around 2,200 pieces per hour, with practically no waste.
Comme il va de soi, et comme il résulte d'ailleurs déjà de ce qui précède, l'invention ne se limite nullement à ceux de ses modes d'application et de réalisation qui ont été plus particulièrement envisagés ; elle en embrasse, au contraire, toutes les variantes. As goes without saying, and as it already follows from the above, the invention is in no way limited to those of its modes of application and embodiments which have been more particularly envisaged; on the contrary, it embraces all its variants.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8124007A FR2518395B3 (en) | 1981-12-22 | 1981-12-22 | PROCESS FOR FIXING A METAL PIECE ON A THERMOPLASTIC PIECE, PARTICULARLY A BLADE OF A SHARP INSTRUMENT SUCH AS BISTOURI, CUTTER OR THE LIKE ON THE HANDLE OF THIS INSTRUMENT, AND AN INSTRUMENT OBTAINED BY THIS PROCESS |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8124007A FR2518395B3 (en) | 1981-12-22 | 1981-12-22 | PROCESS FOR FIXING A METAL PIECE ON A THERMOPLASTIC PIECE, PARTICULARLY A BLADE OF A SHARP INSTRUMENT SUCH AS BISTOURI, CUTTER OR THE LIKE ON THE HANDLE OF THIS INSTRUMENT, AND AN INSTRUMENT OBTAINED BY THIS PROCESS |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| FR2518395A1 true FR2518395A1 (en) | 1983-06-24 |
| FR2518395B3 FR2518395B3 (en) | 1989-04-14 |
Family
ID=9265283
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| FR8124007A Expired FR2518395B3 (en) | 1981-12-22 | 1981-12-22 | PROCESS FOR FIXING A METAL PIECE ON A THERMOPLASTIC PIECE, PARTICULARLY A BLADE OF A SHARP INSTRUMENT SUCH AS BISTOURI, CUTTER OR THE LIKE ON THE HANDLE OF THIS INSTRUMENT, AND AN INSTRUMENT OBTAINED BY THIS PROCESS |
Country Status (1)
| Country | Link |
|---|---|
| FR (1) | FR2518395B3 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0162186A1 (en) * | 1984-04-25 | 1985-11-27 | Becton Dickinson and Company | Surgical blade handle |
| EP0612506A3 (en) * | 1993-02-26 | 1994-12-21 | Becton Dickinson Co | Surgical scalpel for making controlled depth and width inscisions. |
| WO1998022035A1 (en) * | 1996-11-22 | 1998-05-28 | Philippe Berros | Surgery or micro-surgery instrument kit for single use |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH387871A (en) * | 1960-07-25 | 1965-02-15 | Gillette Industries Ltd | Cutting instrument, in particular for surgical purposes |
| FR2072762A5 (en) * | 1969-12-03 | 1971-09-24 | Feather Ind Ltd | |
| GB2034209A (en) * | 1978-11-10 | 1980-06-04 | Gillette Co | Attaching Razor Blades to Supports |
-
1981
- 1981-12-22 FR FR8124007A patent/FR2518395B3/en not_active Expired
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH387871A (en) * | 1960-07-25 | 1965-02-15 | Gillette Industries Ltd | Cutting instrument, in particular for surgical purposes |
| FR2072762A5 (en) * | 1969-12-03 | 1971-09-24 | Feather Ind Ltd | |
| GB2034209A (en) * | 1978-11-10 | 1980-06-04 | Gillette Co | Attaching Razor Blades to Supports |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0162186A1 (en) * | 1984-04-25 | 1985-11-27 | Becton Dickinson and Company | Surgical blade handle |
| EP0612506A3 (en) * | 1993-02-26 | 1994-12-21 | Becton Dickinson Co | Surgical scalpel for making controlled depth and width inscisions. |
| WO1998022035A1 (en) * | 1996-11-22 | 1998-05-28 | Philippe Berros | Surgery or micro-surgery instrument kit for single use |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2518395B3 (en) | 1989-04-14 |
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