WO1991010849A1 - Anti-play nut - Google Patents

Anti-play nut Download PDF

Info

Publication number
WO1991010849A1
WO1991010849A1 PCT/FR1991/000031 FR9100031W WO9110849A1 WO 1991010849 A1 WO1991010849 A1 WO 1991010849A1 FR 9100031 W FR9100031 W FR 9100031W WO 9110849 A1 WO9110849 A1 WO 9110849A1
Authority
WO
WIPO (PCT)
Prior art keywords
nut
parts
wedge
axially
nut according
Prior art date
Application number
PCT/FR1991/000031
Other languages
French (fr)
Inventor
Jean-Paul Colette
Patrick Finot
Original Assignee
Gravograph
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 Gravograph filed Critical Gravograph
Publication of WO1991010849A1 publication Critical patent/WO1991010849A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H25/00—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms
    • F16H25/18—Gearings comprising primarily only cams, cam-followers and screw-and-nut mechanisms for conveying or interconverting oscillating or reciprocating motions
    • F16H25/20—Screw mechanisms
    • F16H25/2003—Screw mechanisms with arrangements for taking up backlash
    • F16H25/2006—Screw mechanisms with arrangements for taking up backlash with more than one nut or with nuts consisting of more than one bearing part

Definitions

  • the present invention relates to so-called anti-backlash nuts, which are used for movement control, for example for moving an organ of a machine or apparatus, when a relative movement of rotation is created between the screw and the nut.
  • the screw is rotated by an external control and the nut, which is locked in rotation, moves in axial translation relative to the screw to control the movement of the member in question.
  • the movement of this member is controlled in both directions and it is therefore desirable that there is no dead time between the rotation of the screw and the linear displacement of the nut, this dead time resulting from the play which must necessarily exist between the thread of the screw and the thread of the nut.
  • anti-backlash nut comprising for example two threaded parts which are axially movable relative to one another and which are subjected to elastic stress in the axial direction to get closer to or move away from each other, so that the threads of these two parts are in abutment against the opposite flanks of the screw thread.
  • the invention aims to improve nuts of this kind, that is to say comprising two threaded portions which can be moved axially relative to each other, the nut according to the invention being of simple structure. full and guaranteeing no play or dead time when reversing the direction of control or when starting.
  • the nut according to the invention is charac ⁇ terized in that:
  • each of the two tapped parts has a bearing surface, these two surfaces being convergent towards one another and at least one of them being inclined at an angle different from 90 ° relative to the common axis of the screw and the body of the nut, a corner has lateral faces which have the same in ⁇ clinination as said respective bearing surfaces and which co operate with them,
  • an elastic element connects the two threaded parts to couple them without rotation play and to bring them axially against the elastic action of the wedge.
  • the wedge by means of elastic means, tends to move the two threaded parts axially so that their respective threads cooperate with the opposite sides of the thread of the screw, this cooperation being ensured so keep on going.
  • the wedge is biased radially inward, to distance or bring the two tapped parts together.
  • the lateral faces of the wedge are planar and the bearing surfaces of the two tapped parts are planar or conical.
  • the two threaded parts are aligned and axially spaced, being for example constituted by sockets.
  • the elastic element is, for example, constituted by a tongue, in particular an annular tongue, which has come together with the two tapped parts.
  • the corner is placed in a notch which is formed between the two tapped parts to separate them; this notch is limited axially by the two bearing surfaces which are opposite and which cooperate with the corner.
  • This enco ⁇ che is located in the radial zone of the elastic element and it extends over an angle much less than 360 ° so that the elastic element connecting the two tapped parts extends into the remaining angular zone not occupied by the notch.
  • the elastic element extends angularly in a radial plane on the 360 ° complé ⁇ ment of the notch, for example over about 220 °, and it is defined by two through radial slots, axially spaced , of which, for each slot, one end opens into the notch and the other end stops at a distance from the latter for the connection of the tongue with the associated tapped part, the two slots opening on the two opposite axial faces of the notch, generally at points which are axially offset.
  • the two bearing surfaces of the two tapped parts are oriented axially in opposite directions and they converge away from the common axis of the screw and the nut, like the faces lateral of the corner which face each other, the corner externally and angularly covering at least part of the radial zone of separation of the two tapped parts and the latter approaching axially under the action of the corner.
  • the elastic means are preferably constituted by an annular spring which is housed in an external groove formed in a radial plane at least on the corner, this spring preferably extending over envi ⁇ ron 360 °.
  • Fig. 1 is an axial section of an anti-play nut established according to an embodiment of the invention
  • Fig. 2 is a section in the radial plane II-II of the nut of FIG. 1;
  • Fig. 3 is an exploded perspective view of the nut of FIGS. 1 and 2 ; and Fig. 4 is an axial jpe and an anti-play nut established according to another embodiment of the invention.
  • the anti-backlash nut cooperates with a control screw which is driven in rotation to axially move the nut which is itself locked in rotation.
  • the anti-backlash nut comprises two tapped parts 1,2 which are axially movable relative to one another and whose threads 3,4, which are identical, are intended to cooperate with the thread of the control screw (not shown).
  • Each threaded part 1,2 has a bearing surface 5,6, these two surfaces 5,6 being convergent towards one another and at least one of them being inclined at an angle other than 90 ° relative to the common axis of the nut and the screw.
  • a wedge 7 is intended to co-operate by its lateral faces 8, 9 with the support surfaces 5, 6 under the action of elastic means 10 which stress the wedge 7 radially to move the threaded parts axially 1 , 2 so that the threads 3,4 thereof cooperate with the sides of opposite orientation of the thread of the screw.
  • the lateral faces 8,9 of the corner have the same inclination as the bearing surfaces 5,6 of the tapped parts 1,2.
  • the bearing surfaces 5,6 of the threaded parts 1, 2 converge towards the common axis of the screw and the nut, being symmetrical with respect to a radial plane.
  • the bearing surfaces 5.6 of the threaded portions 5.6, as well as the side faces 8.9 of the corner, which have the same inclination as the surfaces 5.6, are preferably flat.
  • the support surfaces 5.6 may be conical, the lateral faces 8.9 of the corner remaining flat to allow radial sliding of the corner.
  • the contact between the corner 7 and the tapped parts 1,2 is only made according to two generators.
  • the wedge 7 is recalled radially inwards by the elastic means 10 which may be constituted by a split annular spring which is situated in a radial plane and which surrounds the outer periphery of the wedge 7 by assu ⁇ both its restraint and its recall radially inward.
  • the corner 7 has on its outer peripheral surface a groove 11 of semi-circular section.
  • the wedge 7 is housed in the notch 12 which is formed between the tapped parts 1,2 and which is axially limited by the bearing surfaces 5,6. Under the action of the spring 10, the wedge 7 is biased inwardly in order to separate the tared parts 1.2 until the threads 3.4 come to rest on the opposite sides of the screw thread.
  • This elastic element 13 is in the form of a tongue which extends in a radial plane, over an angle which is the 360 ° complement to the angle occupied by the notch 12.
  • the elastic element 13 is defined by a radial slot 14 which, at one end, opens into the notch 12 and which, at its other end, stops at a distance therefrom in order to provide a connection zone 15 of the elastic element with the tapped part 1; from the other side, a radial slot 16 separates the elastic element 13 from the threaded part 2, one end of this slot 16 opening into the notch 12, on the side of the connection zone 15, and its other end s . stopping at a distance from the notch 12 to provide a connection zone 17 with the threaded part 2.
  • the tongue constituting the elasti ⁇ element 13 that extends annularly, for example over envi ⁇ ron 220 °, and its ends, in the vicinity of the notch 12, are respectively connected to the two tapped parts 1, 2
  • the tongue 13 has come integrally with the tapped parts 1,2 and it is produced either by machining, or during the manufacture of the nut by mold.
  • the two radial slots 14, 16 each open at one end into the notch 12 by the opposite axial faces of the latter, at points which are axially offset because the tongue 13 is located in a radial plane.
  • the tongue 13 deforms by taking the configuration of a portion of helical coil and by resiliently recalling. the threaded parts 1,2 towards one another, against the action of spreading the wedge 7 urged radially inwards by the spring 10.
  • the notch 12 is formed over the entire radial thickness of the nut, and the radial thickness of the wedge 7 and of the tongue 13 is defined so that the screw passes through the space situated between the tapped parts 1 and 2 without interfering with the corner 7 or the tongue 13 and in such a way that the two tapped parts 1,2 are only connected by this tongue.
  • the threaded part 1 carries a terminal flange 19 having for example orifices 20 for mounting on this member.
  • FIG. 4 there is shown in FIG. 4, in axial section, a nut established according to a second embodiment of the invention.
  • a nut established according to a second embodiment of the invention.
  • the same numerical references have been adopted as in the realization of Figs. 1 to 3 for structurally or functionally identical or similar elements, the
  • the adjacent ends of the threaded portions 1, 2 have facing faces opposite and a flange 21, 22, of larger diameter than the rest of the threaded portions 1, 2, the flanges 21,22 having bearing surfaces 5,6 which are oriented axially in opposite directions and which converge away from the common axis of the screw and the nut.
  • the corner 7 of Fig: 4 has an axial dimension greater than that of the corner
  • the corner 7 has flanges 23,24 which define an inside diameter which is greater than the inside diameter of the rest of the corner 7, the flanges 23,24 having the facing inner side faces 8,9 which converge in s 'moving away from the axis common to the screw and the nut and which have the same characteristics as the side faces 8, 9 of the corner of FIGS. 1 to 3.
  • the inside diameter of the flanges 23,24 and the inside diameter of the rest of the wedge 7 are studied so that the wedge can move radially without interfering with the external peripheral surfaces of the threaded portions 1,2 and the flanges 21.22.
  • At least two separate corners 7 are provided, for example arranged symmetrically, these corners receiving the annular spring split 10 by a groove 11.
  • JThe tongue 13 constituting .1 the elastic return element of the threaded parts 1 and 2 is not distinguished from that of FIGS. 1 to 3 only by the fact that its junction zones 15, 17 with the tapped parts 1,2 are closer, due to the fact that the notch 12 in FIGS. 1 to 3 do not exist in this case.
  • the annular spring 10 continuously remembers the two corners 7 radially inwardly and, as a result, it urges the two tapped parts 1,2 to move axially towards one of the other, against the elastic action of the annular tongue 13 connecting the two tapped parts 1 and 2.
  • the elastic return element 13 also constitutes a means of rotationally free rotation of the threaded parts 1,2 so that, when the control screw is actuated in one direction or the other, the part tapped 1,2 is moved immediately in translation, that is to say without play or dead time.
  • the invention is not limited to the embodiments which have been described; on the contrary, we could conceive of various variants without departing from its framework.

Abstract

An anti-play nut which comprises two tapped parts (1, 2), axially movable in relation to one another and cooperating with the thread of a screw or the like, is characterized in that each of the two tapped parts (1, 2) has a bearing surface (5, 6), whereby the two bearing surfaces are convergent in relation to each other, at least one being slanted at an angle other than 90° in relation to the common axis of the screw and the nut; a wedge (7) having lateral faces (8, 9) with the same inclination as said bearing surfaces (5, 6) cooperates with the latter; resilient means (10) radially acts on the wedge (7) so that the lateral faces (8, 9) of the latter cooperate with said bearing surfaces (5, 6) in order to axially displace said two tapped parts (1, 2) in relation to one another, and a resilient element (13) connects the two tapped parts (1, 2) for rotationally tight-coupling them and for axially biasing them against the elastic effect of wedge (7).

Description

ECROU ANTI-JEU ANTI-GAME NUT
La présente invention est relative aux écrous dits anti-jeu, qui sont utilisés pour une commande de mouvement, par exemple pour déplacer un organe d'une machine ou d'un appareil, lorsque l'on crée un mouvement relatif de rota- tion entre la vis et l'écrou. En général, on fait tourner la vis par une commande extérieure et l'écrou, qui est blo¬ qué en rotation, se déplace en translation axiale par rap¬ port à la vis pour commander le déplacement de l'organe en question. Le déplacement de cet organe est commandé dans les deux directions et il est donc souhaitable qu'il n'y ait pas de temps mort entre la rotation de la vis et le déplace¬ ment linéaire de l'écrou, ce temps mort résultant du jeu qui doit nécessairement exister entre le filetage de la vis et le taraudage de l'écrou.The present invention relates to so-called anti-backlash nuts, which are used for movement control, for example for moving an organ of a machine or apparatus, when a relative movement of rotation is created between the screw and the nut. In general, the screw is rotated by an external control and the nut, which is locked in rotation, moves in axial translation relative to the screw to control the movement of the member in question. The movement of this member is controlled in both directions and it is therefore desirable that there is no dead time between the rotation of the screw and the linear displacement of the nut, this dead time resulting from the play which must necessarily exist between the thread of the screw and the thread of the nut.
Pour éviter ce temps mort, on a déjà conçu de nombreux types d'écrou anti-jeu, ces écrous comportant par exemple deux parties taraudées qui sont mobiles axialement l'une par rapport à l'autre et qui sont sollicitées élas- tiquement dans le sens axial pour se rapprocher ou s'éloi¬ gner l'une de l'autre, de sorte que les taraudages de ces deux parties soient en appui contre les flancs opposés du filetage de la vis.To avoid this dead time, numerous types of anti-backlash nut have already been designed, these nuts comprising for example two threaded parts which are axially movable relative to one another and which are subjected to elastic stress in the axial direction to get closer to or move away from each other, so that the threads of these two parts are in abutment against the opposite flanks of the screw thread.
L'invention vise à perfectionner des écrous de ce genre, c'est-à-dire comportant deux parties taraudées qui peuvent être déplacées axialement l'une par rapport à l'autre, l'écrou selon l'invention étant de structure sim¬ ple et garantissant toute absence de jeu ou de temps mort lors de l'inversion du sens de la commande ou lors du dé- marrage.The invention aims to improve nuts of this kind, that is to say comprising two threaded portions which can be moved axially relative to each other, the nut according to the invention being of simple structure. full and guaranteeing no play or dead time when reversing the direction of control or when starting.
A cet effet, l'écrou selon l'invention est carac¬ térisé en ce que :To this end, the nut according to the invention is charac¬ terized in that:
- chacune des deux parties taraudées présente une surface d'appui, ces deux surfaces étant convergentes l'une vers l'autre et l'une au moins d'entre elles étant inclinée d'un angle différent de 90° par rapport à l'axe commun de la vis et du corps de l'écrou, - un coin présente des faces latérales qui ont la même in¬ clinaison que lesdites surfaces d'appui respectives et qui co pèrent avec celles-ci,each of the two tapped parts has a bearing surface, these two surfaces being convergent towards one another and at least one of them being inclined at an angle different from 90 ° relative to the common axis of the screw and the body of the nut, a corner has lateral faces which have the same in¬ clinination as said respective bearing surfaces and which co operate with them,
- des moyens élastiques sollicitent radialement le coin pour que les faces latérales de celui-ci coopèrent avec lesdites surfaces d'appui pour déplacer axialement les deux parties taraudées l'une par rapport à l'autre, et- elastic means urge the corner radially so that the lateral faces of the latter cooperate with said bearing surfaces to move the two tapped parts axially with respect to each other, and
- un élément élastique relie les deux parties taraudées pour les coupler sans jeu en rotation et pour les rappe- 1er axialement contre l'action élastique du coin.- an elastic element connects the two threaded parts to couple them without rotation play and to bring them axially against the elastic action of the wedge.
Avec un tel écrou anti-jeu, le coin, grâce aux moyens élastiques, tend à déplacer axialement les deux par¬ ties taraudées pour que leurs taraudages respectifs coopè¬ rent avec les flancs opposés du filetage de la vis, cette coopération étant assurée de manière continue.With such an anti-backlash nut, the wedge, by means of elastic means, tends to move the two threaded parts axially so that their respective threads cooperate with the opposite sides of the thread of the screw, this cooperation being ensured so keep on going.
En général, le coin est sollicité radialement vers l'intérieur, pour éloigner ou rapprocher les deux parties taraudées.In general, the wedge is biased radially inward, to distance or bring the two tapped parts together.
De préférence, notamment pour des raisons d'usi- nage, les faces latérales du coin sont planes et les sur¬ faces d'appui des deux parties taraudées sont planes ou co¬ niques.Preferably, in particular for machining reasons, the lateral faces of the wedge are planar and the bearing surfaces of the two tapped parts are planar or conical.
Suivant un mode de réalisation préféré, les deux parties taraudées sont alignées et espacées axialement, en étant par exemple constituées par des douilles.According to a preferred embodiment, the two threaded parts are aligned and axially spaced, being for example constituted by sockets.
L'élément élastique est par exemple constitué par une languette, notamment annulaire, qui est venue de ma¬ tière avec les deux parties taraudées.The elastic element is, for example, constituted by a tongue, in particular an annular tongue, which has come together with the two tapped parts.
Suivant un premier type de réalisation, le coin est placé dans une encoche qui est ménagée entre les deux parties taraudées pour écarter celles-ci ; cette encoche est limitée axialement par les deux surfaces d'appui qui sont en regard et qui coopèrent avec le coin. Cette enco¬ che est située dans la zone radiale de l'élément élastique et elle s'étend sur un angle bien inférieur à 360° pour que l'élément élastique reliant les deux parties taraudées s'étende dans la zone angulaire restante non occupée par l'encoche. Dans ce type de réalisation, l'élément élastique s'étend angulairement dans un plan radial sur le complé¬ ment à 360° de l'encoche, par exemple sur environ 220°, et il est défini par deux fentes radiales traversantes, espacées axialement, dont, pour chaque fente, une extré¬ mité débouche dans l'encoche et l'autre extrémité s'arrê¬ te à distance de celle-ci pour la liaison de la languette avec la partie taraudée associée, les deux fentes débou¬ chant sur les deux faces axiales opposées de l'encoche,en général en des points qui sont axialement décalés.According to a first type of embodiment, the corner is placed in a notch which is formed between the two tapped parts to separate them; this notch is limited axially by the two bearing surfaces which are opposite and which cooperate with the corner. This enco¬ che is located in the radial zone of the elastic element and it extends over an angle much less than 360 ° so that the elastic element connecting the two tapped parts extends into the remaining angular zone not occupied by the notch. In this type of embodiment, the elastic element extends angularly in a radial plane on the 360 ° complé¬ ment of the notch, for example over about 220 °, and it is defined by two through radial slots, axially spaced , of which, for each slot, one end opens into the notch and the other end stops at a distance from the latter for the connection of the tongue with the associated tapped part, the two slots opening on the two opposite axial faces of the notch, generally at points which are axially offset.
Suivant un autre type de réalisation, les deux surfaces d'appui des deux parties taraudées sont orientées axialement dans des directions opposées et elles conver¬ gent en s'éloignant de l'axe commun de la vis et de l'écrou, comme les faces latérales du coin qui se font face, le coin recouvrant extérieurement et angulairement une partie au moins de la zone radiale de séparation des deux parties taraudées et ces dernières se rapprochant axialement sous l'action du coin. Dans les diverses réalisations, on peut prévoir soit un seul coin, soit plus d'un coin, par exemple deux coins qui sont disposés symétriquement à la périphérie de 1 'écrou.According to another type of embodiment, the two bearing surfaces of the two tapped parts are oriented axially in opposite directions and they converge away from the common axis of the screw and the nut, like the faces lateral of the corner which face each other, the corner externally and angularly covering at least part of the radial zone of separation of the two tapped parts and the latter approaching axially under the action of the corner. In the various embodiments, it is possible to provide either a single corner or more than one corner, for example two corners which are arranged symmetrically at the periphery of the nut.
Quant aux moyens élastiques, ils sont de préférence constitués par un ressort annulaire qui est logé dans une gorge extérieure pratiquée dans un plan radial au moins sur le coin, ce ressort s'étendant de préférence sur envi¬ ron 360°.As for the elastic means, they are preferably constituted by an annular spring which is housed in an external groove formed in a radial plane at least on the corner, this spring preferably extending over envi¬ ron 360 °.
On comprendra bien l'invention à la lecture du com- plément de description qui va suivre et en référence au dessin annexé qui fait partie de la description et dans lequel :The invention will be clearly understood on reading the additional description which follows and with reference to the appended drawing which forms part of the description and in which:
Fig. 1 est une coupe axiale d'un écrou anti-jeu établi selon un mode de réalisation de l'invention ; Fig. 2 est une coupe dans le plan radial II-II de l'écrou de la Fig. 1 ;Fig. 1 is an axial section of an anti-play nut established according to an embodiment of the invention; Fig. 2 is a section in the radial plane II-II of the nut of FIG. 1;
Fig. 3 est une vue en perspective éclatée de l'écrou des Figs. 1 et 2 ; et Fig. 4 est une et jpe axiale d'un écrou anti-jeu établi selon un autre mode de réalisation de l'invention.Fig. 3 is an exploded perspective view of the nut of FIGS. 1 and 2 ; and Fig. 4 is an axial jpe and an anti-play nut established according to another embodiment of the invention.
Dans la description qui va suivre, on supposera, à titre illustratif et nullement limitatif, que l'écrou anti-jeu coopère avec une vis de commande qui est entraî¬ née en rotation pour déplacer axialement l'écrou qui est lui-même bloqué en rotation.In the description which follows, it will be assumed, by way of illustration and in no way limiting, that the anti-backlash nut cooperates with a control screw which is driven in rotation to axially move the nut which is itself locked in rotation.
On décrira tout d'abord le premier mode de réalisa¬ tion des Figs. 1 à 3. De façon connue, l'écrou anti-jeu selon l'inven¬ tion comprend deux parties taraudées 1,2 qui sont mobiles axialement l'une par rapport à l'autre et dont les tarau¬ dages 3,4, qui sont identiques, sont destinés à coopérer avec le filetage de la vis de commande (non représentée). Chaque partie taraudée 1,2 présente une surface d'appui 5,6, ces deux surfaces 5,6 étant convergentes l'une vers l'autre et l'une au moins d'entre elles étant inclinée d'un angle différent de 90° par rapport à l'axe commun de l'écrou et de la vis. Un coin 7 est destiné à co- opérer par ses faces latérales 8,9 avec les surfaces d'ap¬ pui 5,6 sous l'action de moyens élastiques 10 qui solli¬ citent radialement le coin 7 pour déplacer axialement les parties taraudées 1,2 de manière que les taraudages 3,4 de celles-ci coopèrent avec les flancs d'orientation opposée du filetage de la vis.We will first describe the first embodiment of Figs. 1 to 3. In known manner, the anti-backlash nut according to the invention comprises two tapped parts 1,2 which are axially movable relative to one another and whose threads 3,4, which are identical, are intended to cooperate with the thread of the control screw (not shown). Each threaded part 1,2 has a bearing surface 5,6, these two surfaces 5,6 being convergent towards one another and at least one of them being inclined at an angle other than 90 ° relative to the common axis of the nut and the screw. A wedge 7 is intended to co-operate by its lateral faces 8, 9 with the support surfaces 5, 6 under the action of elastic means 10 which stress the wedge 7 radially to move the threaded parts axially 1 , 2 so that the threads 3,4 thereof cooperate with the sides of opposite orientation of the thread of the screw.
Pour assurer une bonne coopération entre le coin 7 et les parties taraudées 1,2, les faces latérales 8,9 du coin ont la même inclinaison que les surfaces d'appui 5,6 des parties taraudées 1,2. Comme représenté sur la Fig. 1, les surfaces d'appui 5,6 des parties taraudées 1, 2 convergent vers l'axe commun de la vis et de l'écrou, en étant symétriques par rapport à un plan radial. Les sur¬ faces d'appui 5,6 des parties taraudées, de même que les faces latérales 8,9 du coin, qui ont la même inclinaison que les surfaces 5,6, sont de préférence planes. Toutefois les.surfaces d'appui 5,6 peuvent être coniques, les faces latérales 8,9 du coin restant planes pour permettre un coulissement radial du coin. Toutefois, dans ce cas, le contact entre le coin 7 et les parties taraudées 1,2 ne se fait que suivant deux génératrices.To ensure good cooperation between the corner 7 and the tapped parts 1,2, the lateral faces 8,9 of the corner have the same inclination as the bearing surfaces 5,6 of the tapped parts 1,2. As shown in Fig. 1, the bearing surfaces 5,6 of the threaded parts 1, 2 converge towards the common axis of the screw and the nut, being symmetrical with respect to a radial plane. The bearing surfaces 5.6 of the threaded portions 5.6, as well as the side faces 8.9 of the corner, which have the same inclination as the surfaces 5.6, are preferably flat. However, the support surfaces 5.6 may be conical, the lateral faces 8.9 of the corner remaining flat to allow radial sliding of the corner. However, in this case, the contact between the corner 7 and the tapped parts 1,2 is only made according to two generators.
Dans le mode de réalisation des Figs. 1 à 3, le coin 7 est rappelé radialement vers l'intérieur par les moyens élastiques 10 qui peuvent être constitués par un ressort annulaire fendu qui est situé dans un plan radial et qui entoure la périphérie extérieure du coin 7 en assu¬ rant à la fois sa retenue et son rappel radialement vers l'intérieur. Pour la réception du ressort 10, le coin 7 présente sur sa surface périphérique extérieure une gorge 11 de section semi-circulaire.In the embodiment of Figs. 1 to 3, the wedge 7 is recalled radially inwards by the elastic means 10 which may be constituted by a split annular spring which is situated in a radial plane and which surrounds the outer periphery of the wedge 7 by assu¬ both its restraint and its recall radially inward. For receiving the spring 10, the corner 7 has on its outer peripheral surface a groove 11 of semi-circular section.
En fonctionnement, le coin 7 est logé dans l'enco che 12 qui est ménagée entre les parties taraudées 1,2 et qui est limitée axialement par les surfaces d'appui 5,6. Sous l'action du ressort 10, le coin 7 est sollicité ra¬ dialement vers l'intérieur pour écarter les parties tarau¬ dées 1,2 jusqu'à ce que les taraudages 3,4 viennent s'ap¬ puyer sur les flancs opposés du filetage de la vis.In operation, the wedge 7 is housed in the notch 12 which is formed between the tapped parts 1,2 and which is axially limited by the bearing surfaces 5,6. Under the action of the spring 10, the wedge 7 is biased inwardly in order to separate the tared parts 1.2 until the threads 3.4 come to rest on the opposite sides of the screw thread.
Les parties taraudées 1 2, qui sont alignées et espacées axialement, en formant chacune une douille, sont reliées par un élément élastique 13 qui est situé entre elles, dans la zone radiale de l'encoche 12, et qui est relié à ses extrémités respectivement aux parties tarau¬ dées 1,2. Cet élément élastique 13 se présente sous la forme d'une languette qui s'étend dans un plan radial, sur un angle qui est le complément à 360° de l'angle occupé par l'encoche 12. L'élément élastique 13 est défini par une fente radiale 14 qui, à une extrémité, débouche dans l'encoche 12 et qui, à son autre extrémité, s'arrête à distance de celle-ci pour ménager une zone de liaison 15 de l'élément élastique avec la partie taraudée 1 ; de l'au tre côté, une fente radiale 16 sépare l'élément élastique 13 de la partie taraudée 2, une extrémité de cette fente 16 débouchant dans l'encoche 12, du côté de la zone de liaison 15, et son autre extrémité s.arrêtant à distance de l'encoche 12 pour ménager une zone de liaison 17 avec la partie taraudée 2. Ainsi, la languette constituant l'élément élasti¬ que 13 s'étend de manière annulaire, par exemple sur envi¬ ron 220°, et ses extrémités, au voisinage de l'encoche 12, sont reliées respectivement aux deux parties taraudées 1 , 2. De préférence, la languette 13 est venue de matière avec les parties taraudées 1,2 et elle est réalisée soit par usinage, soit lors de la fabrication de l'écrou par moula¬ ge.The threaded parts 1 2, which are aligned and spaced axially, each forming a socket, are connected by an elastic element 13 which is located between them, in the radial region of the notch 12, and which is connected at its ends respectively to the tared parts 1.2. This elastic element 13 is in the form of a tongue which extends in a radial plane, over an angle which is the 360 ° complement to the angle occupied by the notch 12. The elastic element 13 is defined by a radial slot 14 which, at one end, opens into the notch 12 and which, at its other end, stops at a distance therefrom in order to provide a connection zone 15 of the elastic element with the tapped part 1; from the other side, a radial slot 16 separates the elastic element 13 from the threaded part 2, one end of this slot 16 opening into the notch 12, on the side of the connection zone 15, and its other end s . stopping at a distance from the notch 12 to provide a connection zone 17 with the threaded part 2. Thus, the tongue constituting the elasti¬ element 13 that extends annularly, for example over envi¬ ron 220 °, and its ends, in the vicinity of the notch 12, are respectively connected to the two tapped parts 1, 2 Preferably, the tongue 13 has come integrally with the tapped parts 1,2 and it is produced either by machining, or during the manufacture of the nut by mold.
Comme on le voit sur les Figs. 1 à 3, les deux fentes radiales 14,16 débouchent chacune à une extr- ité dans l'encoche 12 par les faces axiales opposées de celle- ci, en des points qui sont axialement décalés du fait que la languette 13 est située dans un plan radial.As seen in Figs. 1 to 3, the two radial slots 14, 16 each open at one end into the notch 12 by the opposite axial faces of the latter, at points which are axially offset because the tongue 13 is located in a radial plane.
Sur la surface périphérique extérieure de la languette 13 est ménagée dans un plan radial une go**..e 18 de section droite semi-circulaire pour la réception _ res¬ sort 10.On the outer peripheral surface of the tongue 13 is formed in a radial plane a go ** .. e 18 of semi-circular cross section for reception _ res¬ fate 10.
En fonctionnement, la languette 13 se déforme en prenant la configuration d'une partie de spire hélicoïdale et en rappelant élastiquement. les parties taraudées 1,2 l'une vers l'autre, contre l'action d'écartement du coin 7 sollicité radialement vers l'intérieur par le ressort 10.In operation, the tongue 13 deforms by taking the configuration of a portion of helical coil and by resiliently recalling. the threaded parts 1,2 towards one another, against the action of spreading the wedge 7 urged radially inwards by the spring 10.
Bien entendu, l'encoche 12 est ménagée sur toute l'épaisseur radiale de l'écrou, et l'épaisseur radiale du coin 7 et de la languette 13 est définie pour que la vis traverse l'espace situé entre les parties taraudées 1 et 2 sans interférer avec le coin 7 ou la languette 13 et de ma nière que les deux parties taraudées 1,2 ne soient reliées que par cette languette. Pour la commande de déplacement de l'organe de l machine ou de l'appareil, la partie taraudée 1 porte un flasque terminal 19 présentant par exemple des orifices 20 pour son montage sur cet organe.Of course, the notch 12 is formed over the entire radial thickness of the nut, and the radial thickness of the wedge 7 and of the tongue 13 is defined so that the screw passes through the space situated between the tapped parts 1 and 2 without interfering with the corner 7 or the tongue 13 and in such a way that the two tapped parts 1,2 are only connected by this tongue. For controlling the movement of the machine member or the device, the threaded part 1 carries a terminal flange 19 having for example orifices 20 for mounting on this member.
On a représenté sur la Fig. 4, en coupe axiale, un écrou établi selon un second mode de réalisation de l'invention. Dans cette variante, pour laquelle on a adop¬ té les mêmes références numériques que dans le mode de réalisation des Figs. 1 à 3 pour des éléments structurelle- ment ou fonctionnelle ent identiques ou similaires, lesThere is shown in FIG. 4, in axial section, a nut established according to a second embodiment of the invention. In this variant, for which the same numerical references have been adopted as in the realization of Figs. 1 to 3 for structurally or functionally identical or similar elements, the
1 deux parties taraudées 1,2 sont sollicitées axialement l'une vers l'autre par le coin 7 tandis .que l'élément élas- tique 13 exerce son action de rappel pour les écarter.1 two tapped parts 1, 2 are biased axially towards one another by the wedge 7, while the elastic element 13 exerts its return action in order to separate them.
Dans ce mode de réalisation, les extrémités adja¬ centes des parties taraudées 1,2 présentent des faces ra¬ diales en regard et un flasque 21,22, de plus grand diamè¬ tre que le reste des parties taraudées 1,2, les flasques 21,22 présentant des surfaces d'appui 5,6 qui sont orien¬ tées axialement dans des directions opposées et qui con¬ vergent en s'éloignant de l'axe commun de la vis et de l'écrou. La nature et la géométrie des surfaces d'appui 5,In this embodiment, the adjacent ends of the threaded portions 1, 2 have facing faces opposite and a flange 21, 22, of larger diameter than the rest of the threaded portions 1, 2, the flanges 21,22 having bearing surfaces 5,6 which are oriented axially in opposite directions and which converge away from the common axis of the screw and the nut. The nature and geometry of the bearing surfaces 5,
6 de l'écrou de la Fig. 4 sont identiques ou similaires à celles de l'écrou des Figs. 1 à 3. Le coin 7 de la Fig:4 présente une dimension axiale supérieure à celle du coin6 of the nut of FIG. 4 are identical or similar to those of the nut of FIGS. 1 to 3. The corner 7 of Fig: 4 has an axial dimension greater than that of the corner
7 des Figs. 1 à 3 et il recouvre extérieurement et angulai¬ rement une partie au moins de la zone radiale de sépara¬ tion entre les deux parties taraudées 1,2, dans laquelle s'étend la languette annulaire 13.7 of Figs. 1 to 3 and it covers externally and angularly at least part of the radial zone of separation between the two tapped parts 1,2, in which the annular tongue 13 extends.
A ses extrémités axiales, le coin 7 présente des flasques 23,24 qui définissent un diamètre intérieur qui est supérieur au diamètre intérieur du reste du coin 7,les flasques 23,24 présentant les faces latérales intérieures 8,9 en regard qui convergent en s'éloignant de l'axe com¬ mun de la vis et de l'écrou et qui présentent des mêmes caractéristiques que les faces latérales 8,9 du coin des Figs. 1 à 3. Le diamètre intérieur des flasques 23,24 et le diamètre intérieur du reste du coin 7 sont étudiés pour que le coin puisse se déplacer radialement sans venir in¬ terférer avec les surfaces périphériques extérieures des parties taraudées 1,2 et des flasques 21,22.At its axial ends, the corner 7 has flanges 23,24 which define an inside diameter which is greater than the inside diameter of the rest of the corner 7, the flanges 23,24 having the facing inner side faces 8,9 which converge in s 'moving away from the axis common to the screw and the nut and which have the same characteristics as the side faces 8, 9 of the corner of FIGS. 1 to 3. The inside diameter of the flanges 23,24 and the inside diameter of the rest of the wedge 7 are studied so that the wedge can move radially without interfering with the external peripheral surfaces of the threaded portions 1,2 and the flanges 21.22.
Dans ce mode de réalisation, on prévoit de pré¬ férence au moins deux coins distincts 7, par exemple dis- posés symétriquement, ces coins recevant le ressort annu¬ laire fendu 10 par une gorge 11. JLa languette 13 constituant .1'élément élastique de rappel des parties taraudées 1 et 2 ne se distingue de eelle des Figs. 1 à 3 que par le fait que ses zones de jonction 15, 17 avec les parties taraudées 1,2 sont plus proches, du fait que l'encoche 12 des Figs. 1 à 3 n'exis¬ te pas dans ce cas.In this embodiment, preferably at least two separate corners 7 are provided, for example arranged symmetrically, these corners receiving the annular spring split 10 by a groove 11. JThe tongue 13 constituting .1 the elastic return element of the threaded parts 1 and 2 is not distinguished from that of FIGS. 1 to 3 only by the fact that its junction zones 15, 17 with the tapped parts 1,2 are closer, due to the fact that the notch 12 in FIGS. 1 to 3 do not exist in this case.
En fonctionnement, le ressort annulaire 10 rappel¬ le en permanence les deux coins 7 radialement vers l'inté¬ rieur et, de ce fait, il sollicite les deux parties tarau- dées 1,2 à se rapprocher axialement l'une de l'autre, con¬ tre l'action élastique de la languette annulaire 13 re¬ liant les deux parties taraudées 1 et 2.In operation, the annular spring 10 continuously remembers the two corners 7 radially inwardly and, as a result, it urges the two tapped parts 1,2 to move axially towards one of the other, against the elastic action of the annular tongue 13 connecting the two tapped parts 1 and 2.
Dans le mode de réalisation de la Fig. 4, on a indiqué qu'on prévoyait de préférence au moins deux coins 7 ; cela s'applique également au mode de réalisation des Figs. 1 à 3 bien que, dans ce cas, la présence de deux coins modifie la géométrie de l'élément élastique de rap¬ pel 13.In the embodiment of FIG. 4, it has been indicated that preferably at least two corners 7 are provided; this also applies to the embodiment of Figs. 1 to 3 although, in this case, the presence of two corners modifies the geometry of the elastic member of rap¬ pel 13.
Il est à noter que l'élément élastique de rappel 13 constitue également un moyen de couplage en rotation sans jeu des parties taraudées 1,2 de sorte que, lorsque la vis de commande est actionnée dans un sens ou dans l'autre, la partie taraudée 1,2 soit déplacée immédiate¬ ment en translation, c'est-à-dire sans jeu ou temps mort. Bien entendu, l'invention n'est pas limitée aux modes de réalisation qui ont été décrits ; on pourrait au contraire concevoir diverses variantes sans sortir pour autant de son cadre. It should be noted that the elastic return element 13 also constitutes a means of rotationally free rotation of the threaded parts 1,2 so that, when the control screw is actuated in one direction or the other, the part tapped 1,2 is moved immediately in translation, that is to say without play or dead time. Of course, the invention is not limited to the embodiments which have been described; on the contrary, we could conceive of various variants without departing from its framework.

Claims

REVENDICATIONS
1. Ecrou anti-jeu, comportant deux parties tarau¬ dées (1,2) mobiles axialement l'une par rapport à l'au¬ tre et destinées à coopérer avec le filetage d'une vis ou analogue, caractérisé en ce que, en combinaison : - chacune des deux parties taraudées (1,2) présente une surface d'appui (5,6), ces deux surfaces étant convergen tes l'une vers l'autre et l'une au moins d'entre elles étant . inclinée d'un angle différent de 90° par rapport à l'axe commun de la vis et de l'écrou, - un coin (7) présente des faces latérales (8,9) qui ont la même inclinaison que lesdites surfaces d'appui res¬ pectives (5,6) et qui coopèrent avec celles-ci,1. Anti-backlash nut, comprising two tarau¬ die parts (1,2) axially movable, one with respect to the other and intended to cooperate with the threading of a screw or the like, characterized in that, in combination: - each of the two threaded parts (1,2) has a bearing surface (5,6), these two surfaces being convergent towards one another and at least one of them being . inclined at an angle different from 90 ° relative to the common axis of the screw and the nut, - a corner (7) has lateral faces (8,9) which have the same inclination as said surfaces respective support (5,6) and which cooperate with them,
- des moyens élastiques (10) sollicitent radialement le coin (7) pour que les faces latérales (8,9) de celui-ci coopèrent avec lesdites surfaces d'appui (5,6) pour déplacer axialement lesdites deux parties taraudées (1, 2) l'une par rapport à l'autre, et- elastic means (10) urge the wedge (7) radially so that the lateral faces (8, 9) of the latter cooperate with said bearing surfaces (5, 6) to axially move said two tapped parts (1, 2) one in relation to the other, and
- un élément élastique (13) relie les deux parties tarau¬ dées (1,2) pour les coupler sans jeu en rotation et pour les rappeler axialement contre l'action élastique du coin (7).- An elastic element (13) connects the two tarau¬ die parts (1,2) to couple them without play in rotation and to recall them axially against the elastic action of the wedge (7).
2. Ecrou anti-jeu selon la revendication 1, cara térisé en ce que les faces latérales (8,9) du coin sont planes. 2. Anti-backlash nut according to claim 1, characterized in that the lateral faces (8, 9) of the wedge are flat.
3. Ecrou anti-jeu selon l'une des revendications3. Anti-play nut according to one of claims
1 et 2, caractérisé en ce que les surfaces d'appui (5,6) des parties taraudées (1,2) sont planes ou coniques.1 and 2, characterized in that the bearing surfaces (5,6) of the threaded parts (1,2) are flat or conical.
4. Ecrou anti-jeu selon l'une des revendica¬ tions 1 à 3, caractérisé en ce que les deux parties tarau- dées (1,2) sont alignées et espacées axialement.4. Anti-play nut according to one of claims 1 to 3, characterized in that the two tapped parts (1,2) are aligned and axially spaced.
5. Ecrou anti-jeu selon la revendication 4, ca¬ ractérisé en ce que les parties taraudées (1,2) sont cons¬ tituées par des douilles.5. Anti-backlash nut according to claim 4, ca¬ acterized in that the threaded parts (1,2) are constituted by sockets.
6. Ecrou anti-jeu selon l'une des revendications 1 à 5, caractérisé en ce que l'élément élastique (13) est constitué par une languette, de préférence venue de matiè- re avec les parties taraudées (1 ,2) "auxquelles elle est reliée par ses extrémités.6. Anti-play nut according to one of claims 1 to 5, characterized in that the elastic element (13) is consisting of a tongue, preferably made of material with the threaded parts (1, 2) "to which it is connected by its ends.
7. Ecrou anti-jeu selon l'une des revendications 1 à 6, caractérisé en ce que le coin (7) est reçu dans une encoche (12) qui est ménagée entre les deux parties taraudées (1,2) et qui est pratiquée sur toute l'épaisseur radiale de l'écrou en étant limitée axialement par les deux surfaces d'appui (5,6) qui sont en regard et qui convergent vers l'axe commun de la vis et de l'écrou, com¬ me les faces latérales (8,9) du coin (7), le coin étant rappelé radialement vers l'axe commun de la vis et de l'écrou pour écarter les parties taraudées (1,2).7. Anti-backlash nut according to one of claims 1 to 6, characterized in that the wedge (7) is received in a notch (12) which is formed between the two tapped parts (1,2) and which is made over the entire radial thickness of the nut, being axially limited by the two bearing surfaces (5,6) which are opposite and which converge towards the common axis of the screw and the nut, the lateral faces (8, 9) of the wedge (7), the wedge being biased radially towards the common axis of the screw and of the nut to spread the tapped parts (1,2).
8. Ecrou anti-jeu selon la revendication 7, caractérisé en ce que l'encoche (12) est située dans la zone radiale de l'élément élastique (13) et s'étend sur un angle bien inférieur à 360° pour que l'élément élas¬ tique (13) reliant les deux parties taraudées (1,2) s'étende dans la zone angulaire restante non occupée par l'encoche (12).8. Anti-backlash nut according to claim 7, characterized in that the notch (12) is located in the radial zone of the elastic element (13) and extends over an angle much less than 360 ° so that the 'elastic element (13) connecting the two threaded parts (1,2) extends in the remaining angular area not occupied by the notch (12).
9. Ecrou anti-jeu selon la revendication 8, carac térisé en ce que l'élément élastique (13) est constitué par une languette qui s'étend angulairement dans un plan radial sur le complément à 360° de l'encoche (12), par exemple sur 220°, et qui est définie par deux fentes ra¬ diales traversantes (14,16) axialement espacées dont,pour chaque fente, une extrémité débouche dans l'encoche (12) et l'autre extrémité s'arrête à distance de l'encoche pour la liaison (15,17) de la languette avec la partie taraudée associée (1,2), les deux fentes (14,16)débouchan sur les deux faces axiales opposées de l'encoche (12), par exemple en des points axialement décalés.9. Anti-backlash nut according to claim 8, characterized in that the elastic element (13) consists of a tongue which extends angularly in a radial plane on the 360 ° complement of the notch (12) , for example over 220 °, and which is defined by two axially spaced through transverse slots (14, 16) of which, for each slot, one end opens into the notch (12) and the other end stops at distance from the notch for the connection (15,17) of the tongue with the associated tapped part (1,2), the two slots (14,16) emerging on the two opposite axial faces of the notch (12), for example at axially offset points.
10. Ecrou anti-jeu selon l'une des revendications 1 à 6, caractérisé en ce que les surfaces d'appui (5,6) des deux parties taraudées (1,2) sont orientées axiale¬ ment dans des directions opposées et convergent en s'é- loignant de l'axe commun de la vis et de l'écrou, comme les faces latérales (8,9) du coin qui se font face, le coin (7) ' recouvrant extérieurement. et angulairement une partie au moins de la zone radiale de séparation des deux parties taraudées (1,2) et ces dernières se rapprochant axialement sous l'action du coin.10. Anti-play nut according to one of claims 1 to 6, characterized in that the bearing surfaces (5,6) of the two threaded parts (1,2) are oriented axially in opposite directions and converge moving away from the common axis of the screw and nut, as the side faces (8, 9) of the corner which face each other, the corner (7) ' covering externally. and angularly at least part of the radial zone of separation of the two tapped parts (1,2) and the latter approaching axially under the action of the wedge.
11. Ecrou anti-jeu selon l'une des revendications 1 à 10, caractérisé en ce qu'il comporte au moins deux coins (7) disposés à la périphérie de l'écrou.11. Anti-backlash nut according to one of claims 1 to 10, characterized in that it comprises at least two corners (7) disposed at the periphery of the nut.
12. Ecrou anti-jeu selon l'une des revendications 1 à 11, caractérisé en ce que les moyens élastiques (10) sont constitués par un ressort angulaire, de préférence fendu.12. Anti-backlash nut according to one of claims 1 to 11, characterized in that the elastic means (10) consist of an angular spring, preferably split.
13. Ecrou anti-jeu selon la revendication 12, carac¬ térisé en ce que le ressort annulaire est reçu dans une gorge extérieure située dans un plan radial et pratiquée au moins sur le coin (7).13. Anti-play nut according to claim 12, carac¬ terized in that the annular spring is received in an outer groove located in a radial plane and formed at least on the corner (7).
14. Ecrou anti-jeu selon l'une des revendications 1 à 13, caractérisé en ce que les moyens élastiques (10) sont agencés pour rappeler le coin radialement vers l'axe commun de la vis et de l'écrou. 14. Anti-play nut according to one of claims 1 to 13, characterized in that the elastic means (10) are arranged to return the corner radially towards the common axis of the screw and the nut.
PCT/FR1991/000031 1990-01-19 1991-01-21 Anti-play nut WO1991010849A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR90/00604 1990-01-19
FR9000604A FR2657403B1 (en) 1990-01-19 1990-01-19 ANTI-GAME NUT.

Publications (1)

Publication Number Publication Date
WO1991010849A1 true WO1991010849A1 (en) 1991-07-25

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ID=9392936

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FR1991/000031 WO1991010849A1 (en) 1990-01-19 1991-01-21 Anti-play nut

Country Status (2)

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FR (1) FR2657403B1 (en)
WO (1) WO1991010849A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1676055A2 (en) * 2003-09-30 2006-07-05 Tritex Corporation Anti-backlash nut assembly for a lead screw
EP1959511A1 (en) * 2005-11-18 2008-08-20 Tsinghua University A thread driven polyhedron ultrasonic motor
US7841251B2 (en) * 2004-10-01 2010-11-30 Tritex Corporation Antiback-lash nut
CN104776184A (en) * 2014-01-14 2015-07-15 麦克森发电机股份公司 Backlash-free spindle nut
CN109985933A (en) * 2019-05-16 2019-07-09 江苏扬力数控机床有限公司 A kind of bending machine rear baffle can compensate for gap

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966780A (en) * 1929-11-18 1934-07-17 Wyrick Engineering Company Automatic compensator for wear and lost motion
GB752459A (en) * 1954-01-14 1956-07-11 Metropolitan Vickers Elelctric Improved means for the elimination of backlash in screw-thread assemblies
GB892931A (en) * 1959-10-27 1962-04-04 George Cohen 600 Group Ltd Improvements in or relating to motion translation devices
WO1989001579A1 (en) * 1987-08-21 1989-02-23 Cambridge Instruments Gmbh Backlash-free drive for the adjustment mechanism of a microtome

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1966780A (en) * 1929-11-18 1934-07-17 Wyrick Engineering Company Automatic compensator for wear and lost motion
GB752459A (en) * 1954-01-14 1956-07-11 Metropolitan Vickers Elelctric Improved means for the elimination of backlash in screw-thread assemblies
GB892931A (en) * 1959-10-27 1962-04-04 George Cohen 600 Group Ltd Improvements in or relating to motion translation devices
WO1989001579A1 (en) * 1987-08-21 1989-02-23 Cambridge Instruments Gmbh Backlash-free drive for the adjustment mechanism of a microtome

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1676055A2 (en) * 2003-09-30 2006-07-05 Tritex Corporation Anti-backlash nut assembly for a lead screw
EP1676055A4 (en) * 2003-09-30 2010-03-31 Tritex Corp Anti-backlash nut assembly for a lead screw
US7841251B2 (en) * 2004-10-01 2010-11-30 Tritex Corporation Antiback-lash nut
EP1959511A1 (en) * 2005-11-18 2008-08-20 Tsinghua University A thread driven polyhedron ultrasonic motor
EP1959511A4 (en) * 2005-11-18 2011-02-02 Univ Tsinghua A thread driven polyhedron ultrasonic motor
CN104776184A (en) * 2014-01-14 2015-07-15 麦克森发电机股份公司 Backlash-free spindle nut
CN104776184B (en) * 2014-01-14 2017-06-23 麦克森发电机股份公司 Gapless mainshaft nut
CN109985933A (en) * 2019-05-16 2019-07-09 江苏扬力数控机床有限公司 A kind of bending machine rear baffle can compensate for gap

Also Published As

Publication number Publication date
FR2657403A1 (en) 1991-07-26
FR2657403B1 (en) 1992-04-17

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