EP0444372A1 - Elastic assembly means for two oscillating elements, particularly scissor blades - Google Patents

Elastic assembly means for two oscillating elements, particularly scissor blades Download PDF

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Publication number
EP0444372A1
EP0444372A1 EP90420104A EP90420104A EP0444372A1 EP 0444372 A1 EP0444372 A1 EP 0444372A1 EP 90420104 A EP90420104 A EP 90420104A EP 90420104 A EP90420104 A EP 90420104A EP 0444372 A1 EP0444372 A1 EP 0444372A1
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EP
European Patent Office
Prior art keywords
bore
well
elements
axle
blades
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Withdrawn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
EP90420104A
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German (de)
French (fr)
Inventor
Louis Cau
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.)
Locau International SA
Original Assignee
Locau International SA
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 Locau International SA filed Critical Locau International SA
Publication of EP0444372A1 publication Critical patent/EP0444372A1/en
Withdrawn legal-status Critical Current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
    • B26B13/00—Hand shears; Scissors
    • B26B13/28—Joints

Definitions

  • the scissor blades are fixed by a shouldered screw, the threaded part of which is screwed with locking in a tapping of one of the blades and the shouldered part of which is housed, with functional play, in an appropriate bore of the other blade. wedged in translation by the head of said screw.
  • This mode of articulation is not suitable for scissors made of synthetic material because the coefficient of friction of this material is low and promotes loosening of the screw.
  • the installation of a screw requires a mounting operation increasing the cost of the final product even when the use of plastic blades is intended to provide an inexpensive article.
  • the patent US 4007524 describes a permanent connection mode between the two blades of a plastic scissor consisting in riveting the end of an axis in the form of a split well projecting from one of the blades and engaged in the bore of the other blade.
  • This technique has the drawback, due to manufacturing tolerances, of not controlling the tightening of the two blades, and subsequently of not allowing the adjustment of this tightening to compensate for operating wear, so that the chisel cuts less less over time.
  • the present invention aims to remedy this by providing a means of assembling two oscillating elements which, applicable in particular to the articulation of the chisel blades, which is inexpensive, results in a very reduced assembly time, ensures a reliable connection and allows adjustment, during assembly and over time, of the tightening of the two elements.
  • the axis cooperates with a locking finger, the rod of which is capable of being engaged with clamping in the bore of the shaft in the form of a well and whose head has the shape of a cup, with concavity turned in the direction of the rod, and has a circular edge of diameter greater than that outside of the collar, this edge constituting means of wedging in axial translation of the two elements and member for adjusting the friction of these last, coming into contact with the articulated element.
  • this wedging is elastic and guarantees the connection and sufficient tightening of the two elements whatever the inevitable dimensional variations following the manufacturing tolerances, and in particular of molding, of the two parts.
  • FIG. 1 designates a chisel composed of two blades 2 and 3 obtained by molding a synthetic material.
  • the blade 2 is integral with a projecting articulation axis 4 having the general shape of a well, that is to say comprising an axial bore 5 passing right through it.
  • the axis 4 is secured at its free end to an external flange 6. It has, in its part projecting from the blade 2, longitudinal slots 7 opening into the bore 5. These slots, two to eight in number, allow the walls of the shaft constituting the well to deform during its engagement in the bore 8, formed in the blade 3 and which may include a chamfer 3a (FIG. 3) to promote this engagement.
  • connection of the blades 2 and 3 is terminated by introducing a locking finger 9 into the bore 5 of the well.
  • the cylindrical rod 9a of this finger is force fitted into the bore 5 so as to oppose any radial retraction of the split well.
  • Its head 9b has the general shape of a cup whose concavity is turned towards the side of the rod 9a.
  • the edge of this cup is arranged to form a circular edge 10 having a diameter larger than that of the collar 6, so that in the locking position by the finger 9, said edge bears on the external face of the blade 3, as shown in Figure 4.
  • the locking finger helps to wedge in translation the blade 3 relative to the blade 2 while communicating to these two blades, a transverse tightening elastic to compensate for manufacturing tolerances and to obtain, over time, satisfactory operation of the chisel.
  • the head 9b also constitutes an embellishment and can have any hollow or raised patterns giving it the shape of a screw head or the like.
  • Such an assembly means which has been described above in the context of its application to the connection of two blades of a chisel, can also be used to ensure the connection of all oscillating elements which can be assembled in pairs.

Abstract

This assembly means applies to oscillating elements of which one comprises an articulation axle 4 in the form of a split elastic well with a retaining collar, while the other is provided with a bore 8 for the passage of the said axle According to the invention, the axle 4 cooperates with a locking pin 9, whose shaft 9a is capable of engaging tightly in the bore 5 of the well-shaped axle 4 and whose head 9b forms a cap whose concavity faces the direction of the shaft 9a and has a circular edge 10 of diameter greater than that of the collar 6, this edge constituting a means for blocking the axial translation for the two elements and a device for adjusting the friction of the latter by coming into contact with the articulated element 3. <IMAGE>

Description

Traditionnellement, les lames de ciseau sont fixées par une vis épaulée dont la partie filetée se visse avec blocage dans un taraudage de l'une des lames et dont la partie épaulée se loge, avec jeu fonctionnel, dans un alésage approprié de l'autre lame calée en translation par la tête de ladite vis.Traditionally, the scissor blades are fixed by a shouldered screw, the threaded part of which is screwed with locking in a tapping of one of the blades and the shouldered part of which is housed, with functional play, in an appropriate bore of the other blade. wedged in translation by the head of said screw.

Ce mode d'articulation, couramment utilisée, ne convient pas pour les ciseaux en matière synthétique car le coefficient de frottement de ce matériau est faible et favorise le déserrage de la vis. De plus, la mise en place d'une vis nécessite une opération de montage augmentant le coût du produit final alors même que le recours a des lames en matière synthétique est destiné à procurer un article peu onéreux.This mode of articulation, commonly used, is not suitable for scissors made of synthetic material because the coefficient of friction of this material is low and promotes loosening of the screw. In addition, the installation of a screw requires a mounting operation increasing the cost of the final product even when the use of plastic blades is intended to provide an inexpensive article.

Le brevet U.S. 4007524 décrit un mode de liaison permament entre les deux lames d'un ciseau en matière synthétique consistant à river l'extrémité d'un axe en forme de puits fendu saillant de l'une des lames et engagé dans l'alésage de l'autre lame. Cette technique présente l'inconvénient, en raison des tolérances de fabrication, de ne pas maitriser le serrage des deux lames, et ultérieurement de ne pas permettre le réglage de ce serrage pour compenser les usures de fonctionnement, de sorte que le ciseau coupe de moins en moins dans le temps.The patent US 4007524 describes a permanent connection mode between the two blades of a plastic scissor consisting in riveting the end of an axis in the form of a split well projecting from one of the blades and engaged in the bore of the other blade. This technique has the drawback, due to manufacturing tolerances, of not controlling the tightening of the two blades, and subsequently of not allowing the adjustment of this tightening to compensate for operating wear, so that the chisel cuts less less over time.

La présente invention a pour but de remédier à cela en fournissant un moyen d'assemblage de deux éléments oscillants qui, applicable en particulier à l'articulation des lames de ciseau, soit peu onéreux, conduise à un temps de montage très réduit, assure une liaison fiable et permette le réglage, au montage et dans le temps, du serrage des deux éléments.The present invention aims to remedy this by providing a means of assembling two oscillating elements which, applicable in particular to the articulation of the chisel blades, which is inexpensive, results in a very reduced assembly time, ensures a reliable connection and allows adjustment, during assembly and over time, of the tightening of the two elements.

Selon l' invention, l'axe coopère avec un doigt de verrouillage, dont la tige est apte à être engagée avec serrage dans l'alésage de l'axe en forme de puits et dont la tête a la forme d'une cupule, avec concavité tournée en direction de la tige, et présente une arête circulaire de diamètre supérieur à celui extérieur de la collerette, cette arête constituant moyen de calage en translation axiale des deux éléments et organe de réglage du frottement de ces derniers, en venant en contact avec l'élément articulé.According to the invention, the axis cooperates with a locking finger, the rod of which is capable of being engaged with clamping in the bore of the shaft in the form of a well and whose head has the shape of a cup, with concavity turned in the direction of the rod, and has a circular edge of diameter greater than that outside of the collar, this edge constituting means of wedging in axial translation of the two elements and member for adjusting the friction of these last, coming into contact with the articulated element.

Ainsi, pour assembler les deux éléments, il suffit d'engager l'axe du premier dans l'alésage du second, ce qui a pour effet de comprimer radialement la collerette du puits en déformant élastiquement le puits, puis, dès que cette collerette a repris élastiquement sa position dans l'alésage, de confirmer la liaison obtenue en engageant le doigt de verrouillage dans le puits. A la fin de cet engagement, qui s'effectue en force, le puits ne peut plus se déformer radialement et la téte du doigt prend appui, par son arête périphérique, sur l'élément intermédiaire et constitue ainsi un organe de calage en translation.Thus, to assemble the two elements, it suffices to engage the axis of the first in the bore of the second, which has the effect of radially compressing the collar of the well by elastically deforming the well, then, as soon as this collar has resumed its position elastically in the bore, to confirm the connection obtained by engaging the locking finger in the well. At the end of this engagement, which is effected by force, the well can no longer deform radially and the head of the finger is supported, by its peripheral edge, on the intermediate element and thus constitutes a wedging member in translation.

Grâce à l'élasticité de la tête, ce calage est élastique et garantit la liaison et un serrage suffisant des deux éléments quelles que soient les inévitables variations dimensionnelles consécutives aux tolérances de fabrication, et notamment de moulage,des deux pièces.Thanks to the elasticity of the head, this wedging is elastic and guarantees the connection and sufficient tightening of the two elements whatever the inevitable dimensional variations following the manufacturing tolerances, and in particular of molding, of the two parts.

L'invention sera mieux comprise à l'aide de la description qui suit en référence au dessin schématique annexé représentant une forme d'exécution de ce moyen d'assemblage dans le cas de son application à la liaison des deux branches d'un ciseau.

  • Figure 1 est une vue en perspective d'un ciseau à l'état monté,
  • Figures 2, 3 et 4 sont des vues partielles en coupe transversale montrant, respectivement, l'axe de la première lame, l'assemblage des deux lames et le verrouillage de cet assemblage.
The invention will be better understood with the aid of the description which follows with reference to the appended diagrammatic drawing representing an embodiment of this means of assembly in the case of its application to the connection of the two branches of a chisel.
  • FIG. 1 is a perspective view of a scissor in the assembled state,
  • Figures 2, 3 and 4 are partial cross-sectional views showing, respectively, the axis of the first blade, the assembly of the two blades and the locking of this assembly.

A la figure 1, 2 désigne un ciseau composé de deux lames 2 et 3 obtenues par moulage d'une matière synthétique. La lame 2 est solidaire d'un axe d'articulation en saillie 4 ayant la forme générale d'un puits, c'est à dire comportant un alésage axial 5 le traversant de part en part. L'axe 4 est solidaire à son extrémité libre d'une collerette externe 6. Il comporte, dans sa partie dépassant de la lame 2, des fentes longitudinales 7 débouchant dans l'alésage 5. Ces fentes, au nombre de deux à huit, permettent aux parois de l'axe constituant puits de se déformer lors de son engagement dans l'alésage 8, ménagé dans la lame 3 et pouvant comporter un chanfrein 3a (figure 3) pour favoriser cet engagement.In FIG. 1, 2 designates a chisel composed of two blades 2 and 3 obtained by molding a synthetic material. The blade 2 is integral with a projecting articulation axis 4 having the general shape of a well, that is to say comprising an axial bore 5 passing right through it. The axis 4 is secured at its free end to an external flange 6. It has, in its part projecting from the blade 2, longitudinal slots 7 opening into the bore 5. These slots, two to eight in number, allow the walls of the shaft constituting the well to deform during its engagement in the bore 8, formed in the blade 3 and which may include a chamfer 3a (FIG. 3) to promote this engagement.

Comme le montre la figure 3, dès que le puits fendu constituant l'axe 4 est engagé dans l'alésage 8, il est contraint radialement par cet alésage jusqu'à ce que sa collerette 6 échappe de cet alésage, cas dans lequel son élasticité naturelle lui permet de reprendre sa position initiale en rabattant la collerette 6 sur la face supérieure de la lame 3. Dans cette phase du montage, la lame 3 est liée en rotation à la lame 2 et est calée en translation avec celle-ci par la collerette 6.As shown in Figure 3, as soon as the split well constituting the axis 4 is engaged in the bore 8, it is constrained radially by this bore until its flange 6 escapes from this bore, case in which its natural elasticity allows it to return to its initial position by folding down the flange 6 on the upper face of the blade 3. In this phase of assembly, the blade 3 is linked in rotation to the blade 2 and is locked in translation with the latter by the flange 6.

Selon l'invention, la liaison des lames 2 et 3 est terminée en introduisant un doigt de verrouillage 9 dans l'alésage 5 du puits. La tige cylindrique 9a de ce doigt est emmanchée de force dans l'alésage 5 de manière à s'opposer à toute rétraction radiale du puits fendu. Sa tête 9b a la forme générale d'une cupule dont la concavité est tournée du côté de la tige 9a. Le bord de cette cupule est aménagée pour former une arête circulaire 10 ayant un diamètre plus grand que celui de la collerette 6, afin qu'en position de verrouillage par le doigt 9, ladite arête prenne appui sur la face externe de la lame 3, comme montré à la figure 4. Dans cette position et grâce à l'élasticité de la cupule 9b, le doigt de verrouillage contribue à caler en translation la lame 3 par rapport à la lame 2 tout en communiquant à ces deux lames, un serrage transversal élastique permettant de compenser les tolérances de fabrication et d'obtenir, dans le temps, un fonctionnement satisfaisant du ciseau.According to the invention, the connection of the blades 2 and 3 is terminated by introducing a locking finger 9 into the bore 5 of the well. The cylindrical rod 9a of this finger is force fitted into the bore 5 so as to oppose any radial retraction of the split well. Its head 9b has the general shape of a cup whose concavity is turned towards the side of the rod 9a. The edge of this cup is arranged to form a circular edge 10 having a diameter larger than that of the collar 6, so that in the locking position by the finger 9, said edge bears on the external face of the blade 3, as shown in Figure 4. In this position and thanks to the elasticity of the cup 9b, the locking finger helps to wedge in translation the blade 3 relative to the blade 2 while communicating to these two blades, a transverse tightening elastic to compensate for manufacturing tolerances and to obtain, over time, satisfactory operation of the chisel.

La tête 9b constitue également enjoliveur et peut présenter tous motifs en creux ou en relief lui donnant la forme d'une tête de vis ou autres.The head 9b also constitutes an embellishment and can have any hollow or raised patterns giving it the shape of a screw head or the like.

Un tel moyen d'assemblage, qui a été décrit ci dessus dans le cadre de son application à la liaison de deux lames d'un ciseau, peut aussi être utilisé pour assurer la liaison de tous éléments oscillants assemblables par paire.Such an assembly means, which has been described above in the context of its application to the connection of two blades of a chisel, can also be used to ensure the connection of all oscillating elements which can be assembled in pairs.

Claims (1)

Moyen d'assemblage élastique de deux éléments oscillants, et en particulier de lames d'un ciseau, composé d'éléments en matière synthétique moulée dont l'un comporte un axe d'articulation 4 en forme de puits élastique fendu avec collerette de retenue tandis que l'autre est muni d'un alésage 8 pour le pasage dudit axe, caractérisé en ce que l'axe 4 coopère avec un doigt de verrouillage 9, dont la tige 9a est apte à être engagée avec serrage dans l'alésage 5 de l'axe 4 en forme de puits et dont la tête 9b a la forme d'une cupule, avec la concavité tournée en direction de la tige 9a, et présente une arête circulaire 10 de diamètre supérieur à celui extérieur de la collerette 6, cette arête constituant moyen de calage en translation axiale des deux éléments et organe de réglage du frottement de ces derniers, en venant en contact avec l'élément articulé 3.Means of elastic assembly of two oscillating elements, and in particular of blades of a chisel, composed of molded plastic elements, one of which has a hinge pin 4 in the form of a split elastic well with retaining collar while that the other is provided with a bore 8 for the passage of said axis, characterized in that the axis 4 cooperates with a locking finger 9, the rod 9a of which is capable of being engaged with clamping in the bore 5 of the shaft 4 in the form of a well and the head 9b of which has the shape of a cup, with the concavity turned in the direction of the rod 9a, and has a circular edge 10 of diameter greater than that outside of the collar 6, this ridge constituting means of wedging in axial translation of the two elements and member for adjusting the friction of the latter, coming into contact with the articulated element 3.
EP90420104A 1988-12-07 1990-02-27 Elastic assembly means for two oscillating elements, particularly scissor blades Withdrawn EP0444372A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8816495A FR2639861B1 (en) 1988-12-07 1988-12-07 MEANS FOR ASSEMBLING TWO OSCILLATING ELEMENTS AND IN PARTICULAR BLADES OF A SCISSOR

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EP0444372A1 true EP0444372A1 (en) 1991-09-04

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EP90420104A Withdrawn EP0444372A1 (en) 1988-12-07 1990-02-27 Elastic assembly means for two oscillating elements, particularly scissor blades

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EP (1) EP0444372A1 (en)
FR (1) FR2639861B1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0631718A1 (en) * 1993-06-29 1995-01-04 Fiskars Inc. Resilient lock for a hand tool
WO1997018064A2 (en) * 1995-11-15 1997-05-22 Pietro Poggetti Scissors, in particular for hairdressers
DE10138394A1 (en) * 2001-08-04 2003-02-27 Aesculap Ag & Co Kg Medical instrument
DE10242152B3 (en) * 2002-09-05 2004-04-08 Aesculap Ag & Co. Kg Two-part medical instrument

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5426857A (en) * 1992-11-30 1995-06-27 Fiskars Oy Ab Pivoted hand-held cutting tool
FR2933890B1 (en) * 2008-07-15 2010-12-17 Bouvet HAND TOOL, METHOD FOR MANUFACTURING THE SAME, MOLDS FOR THIS PROCESS

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB261856A (en) * 1925-08-31 1926-11-30 Verena Winifred Holmes Improvements in scissors, and like tools comprising two leg members pivotally connected
DE2638740A1 (en) * 1976-08-27 1978-03-09 Gardena Kress & Kastner Gmbh Hinge pin for hedge clipping shears - has tensioning piece with corrugated elastic edge bearing against corrugated lever face
GB1597745A (en) * 1977-09-27 1981-09-09 Marin S Scissors or shears
US4757664A (en) * 1985-06-04 1988-07-19 Screenex Wire Weaving Manufacturers (Proprietary) Limited Wear resistant panel arrangement

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4007524A (en) * 1974-12-26 1977-02-15 Coats & Clark, Inc. Cast articulated tool

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB261856A (en) * 1925-08-31 1926-11-30 Verena Winifred Holmes Improvements in scissors, and like tools comprising two leg members pivotally connected
DE2638740A1 (en) * 1976-08-27 1978-03-09 Gardena Kress & Kastner Gmbh Hinge pin for hedge clipping shears - has tensioning piece with corrugated elastic edge bearing against corrugated lever face
GB1597745A (en) * 1977-09-27 1981-09-09 Marin S Scissors or shears
US4757664A (en) * 1985-06-04 1988-07-19 Screenex Wire Weaving Manufacturers (Proprietary) Limited Wear resistant panel arrangement

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0631718A1 (en) * 1993-06-29 1995-01-04 Fiskars Inc. Resilient lock for a hand tool
WO1997018064A2 (en) * 1995-11-15 1997-05-22 Pietro Poggetti Scissors, in particular for hairdressers
WO1997018064A3 (en) * 1995-11-15 1997-07-03 Pietro Poggetti Scissors, in particular for hairdressers
DE10138394A1 (en) * 2001-08-04 2003-02-27 Aesculap Ag & Co Kg Medical instrument
DE10138394C2 (en) * 2001-08-04 2003-07-24 Aesculap Ag & Co Kg Medical instrument
DE10242152B3 (en) * 2002-09-05 2004-04-08 Aesculap Ag & Co. Kg Two-part medical instrument
US7393348B2 (en) 2002-09-05 2008-07-01 Aesculap Ag & Co. Kg Two-part medical instrument

Also Published As

Publication number Publication date
FR2639861A1 (en) 1990-06-08
FR2639861B1 (en) 1993-10-29

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