EP0090103B1 - Methode und Vorrichtung zum Aufbringen eines Überzuges auf ein inneres Schraubgewinde eines Befestigungselementes - Google Patents

Methode und Vorrichtung zum Aufbringen eines Überzuges auf ein inneres Schraubgewinde eines Befestigungselementes Download PDF

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Publication number
EP0090103B1
EP0090103B1 EP19820301595 EP82301595A EP0090103B1 EP 0090103 B1 EP0090103 B1 EP 0090103B1 EP 19820301595 EP19820301595 EP 19820301595 EP 82301595 A EP82301595 A EP 82301595A EP 0090103 B1 EP0090103 B1 EP 0090103B1
Authority
EP
European Patent Office
Prior art keywords
sealant
applicator
threads
base
axis
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.)
Expired
Application number
EP19820301595
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English (en)
French (fr)
Other versions
EP0090103A1 (de
Inventor
Colin Watson
David John Dunn
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.)
Henkel Loctite Corp
Original Assignee
Henkel Loctite Corp
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 Henkel Loctite Corp filed Critical Henkel Loctite Corp
Priority to DE8282301595T priority Critical patent/DE3272972D1/de
Priority to EP19820301595 priority patent/EP0090103B1/de
Publication of EP0090103A1 publication Critical patent/EP0090103A1/de
Application granted granted Critical
Publication of EP0090103B1 publication Critical patent/EP0090103B1/de
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C7/00—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C7/00—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work
    • B05C7/06—Apparatus specially designed for applying liquid or other fluent material to the inside of hollow work by devices moving in contact with the work

Definitions

  • This invention relates generally to a technique for applying a sealant to the threads of a fastener for providing a fluid-tight seal when threadedly engaged with a mating threaded element, as well as a device for carrying out such technique. More particularly, this invention relates to such a method and device wherein the sealant is pressed into the thread roots of the element, and differently sized elements are capable of being coated without changing applicators.
  • differently sized female threaded elements having differently sized threads require complementarily sized threaded applicators, and repeated use of the same threaded applicator for the same sized elements oftentimes results in an undue buildup of sealant on the applicator threads.
  • the invention is concerned more particularly with a device for applying a sealant to the threads of an element having a circular threaded opening, and a method employing such a device, of a kind comprising a hollow sealant applicator having a central axis and a sealant discharge orifice through a side wall thereof, the discharge orifice lying at a predetermined radial distance from that axis, and a base for holding the element, and in which the base and applicator are arranged for relative movement towards and away from one another along that axis and transversely relative to one another until an operative sealant applying position is reached where the side wall of the applicator touches the threads of the fastener.
  • Another object of the invention is to provide such a method and device which requires but a single applicator for the coating of differently sized threads of differently sized threaded elements;
  • a further object of the present invention is to provide such a method and device wherein the internally threaded element is held on a rotatable base against relative transverse movement therewith, and a side force is induced during rotation to allow sealant to be pressed into the thread roots of the element while any excess sealant is wiped from the threads by the edge of a discharge orifice opening through a side wall of a sealant applicator;
  • a still further object of the invention is to provide such a method and device wherein the applicator has a smooth outer wall through which the discharge orifice opens, the applicator being so positioned that its central axis lies parallel to and offset in one direction from the rotational axis with the side wall contacting the crests of the threads, such force thereby being induced in such one direction;
  • a still further object of the invention is to provide such a method and device wherein the discharge orifice of the sealant applicator is elongated in the direction of the applicator axis for spanning a plurality of threads for the simultaneous coating of same during a single revolution;
  • a still further object of the present invention is to provide such a method and device wherein the base may be made of magnetic material for holding a ferromagnetic threaded element by magnetic attraction, or the base may be formed as a chuck element for holding the threaded element in place.
  • a device for applying a sealant to the threads of an element having a circular threaded opening comprising a hollow sealant applyingor having a central axis and a sealant discharge orifice through a side wall thereof, the discharge orifice lying at a predetermined radial distance from said axis, and a base for holding the element, the base and the applicator being arranged for relative movement toward and away from one another along said axis and transversely relative to one another until an operative sealant applying position is reached in which the side wall of the applicator touches the threads of the element, characterised in that the side wall of the applicator, which in the operative sealant applying position touches the threads of the element, has a smooth and unthreaded exterior, and in that the base is rotatable in the operative sealant applying position about an axis which is parallel to and offset from the applicator axis.
  • a process for applying a sealant to the threads of an element having a circular threaded opening comprising holding the element on a base for movement therewith, providing a hollow sealant applicator having a central axis and a sealant discharge orifice opening through a side wall thereof which orifice lies at a predetermined radial distance from said axis, relatively moving the base with respect to the applicator along said axis and transversely relative to one another until an operative sealant applying position is reached in which the side wall of the applicator touches the threads of the element, and discharging the sealant through said orifice into the threads, characterised by providing the side wall of the applicator, which in the operative sealant applying position touches the threads of the element, with a smooth and unthreaded exterior, and by rotating the base during discharge of the sealant about a rotational axis which is parallel to and offset from the applicator axis.
  • a side force directed toward the orifice is induced during rotation about said rotational axis for facilitating the pressing of sealant into the thread roots of the element while any excess sealant is wiped from the threads by an edge of said side wall.
  • the sealant applying device is generally designated 10 in Figure 1 and comprises a rotatable base 11 mounted in some suitable manner for rotation about its central axis 12 in a clockwise direction shown by the arrows of Figures 1 and 2.
  • Conventional means are provided by rotating the base in the illustrated direction, or in a counterclockwise direction without departing from the invention.
  • a pilot 13 extends outwardly from the upper surface of the base over which an internally threaded element E, such as a nut fastener, is seated.
  • the pilot is shaped so that it snugly embraces the lowermost thread portion of element E so as to prevent any relative transverse shifting of the threaded element during the sealant applying process.
  • axis 14 of the pilot will be offset relative to rotational axis 12 in either direction or will be coincident thereto.
  • the base may be made of magnetic material for holding elements of ferromagnetic material thereto by magnetic attraction.
  • a hollow sealant applicator 15 is mounted in any normal manner for movement along its central axis 16 in the directions illustrated by the double arrows in Figure 1.
  • the applicator is connected to a supply (not shown) of sealant S via a supply tube 17 having a discharge shut-off valve 18 associated therewith for opening and closing the flow of sealant from the supply.
  • a hollow passageway 19 of the applicator communicates with supply tube 17 via valve 18 and terminates in a discharge orifice 21 (Fig. 3) located in a side wall 22 of the applicator which lies at a predetermined transverse distance from central axis 16.
  • Side wall 22 has a smooth and unthreaded exterior as shown.
  • the sealant applicator is positioned relative to the rotatable base such that its central axis 16 lies to and offset in one direction from central axis 12 with side wall 22 of the applicator in light contact engagement with the crests of the internal threads T of the element to be coated (Figs. 1 and 2).
  • the applicator is mounted in place for axial movement, as aforedescribed, in the direction of the double arrows of Figure 1, but is otherwise incapable of rotary movement about its central axis 16.
  • Base 11 on the other hand, is mounted in place for rotation about its central axis 12, and may be further mounted for axial movement toward and away from the applicator as an alternative to the mounting of the applicator for axial movement, so long as relative axial movement between the applicator and the base is facilitated.
  • either the applicator or the base is mounted for transverse movement so as to assure the necessary relative transverse positioning between these parts.
  • the applicator In carrying out the sealant applying operation, the applicator will be spaced axially relative to the base a distance greater than the thickness of a threaded element E to be coated.
  • a base 11 will be selected having an appropriately sized pilot 13 substantially equal to the outer diameter pf an element E to be coated. In other words, if the outer diameter of the element to be coated is 2.5 cms (one inch), a base 11 having a 2.5 cm (one inch) pilot diameter will be selected.
  • the applicator and base will then be shifted transversely relative to one another until side wall 22 is'vertically aligned with the crests of threads T at a point of tangency 23 (Fig. 4).
  • an element E is transferred by some suitable means and is seated on the rotatable base. If element E is of ferromagnetic meterial, it will be seated over pilot 13 of a magentic base 11 so as to be held firmly in place by magnetic attraction. Otherwise, if the element to be coated is of non-ferromagnetic material it will be seated within the jaws of a chuck 29 (Fig. 5), which will be described in more detail hereinafter.
  • Valve 18 remains in a closed position, and the applicator is operatively connected with an advance mechanism 24 so that, upon command, the applicator will be advanced into the threaded opening of element E seated on the base.
  • sealant cut-off valve 18 is opened and sealant under pressure in line 17 flows through passage 19 and out of the elongated discharge orifice.
  • valve 18 When valve 18 is opened, the means (not shown) provided for rotating the base is actuated for effecting clockwise movement relative to the stationary applicator.
  • the discharged sealant under pressure is resisted by an induced force F (Fig. 4) acting in a direction aligned with the direction in which axis 16 is offet from axis 12.
  • F induced force
  • the snug engagement between the pilot and element E and the sufficiently strong magnetic attraction between the base and E facilitates this induced force.
  • the dischrage sealant is therefore pressed into the roots of threads T during rotation of the base, and an edge 25 of the discharge orifice (Figs. 2 and 3) functions as a doctor blade wiping any excees sealant from the threads.
  • Valve 18 is operatively connected with an adjustable timing device (not shown) which is set for maintaining the valve open for an interval permitting the sealant to flow into the threads for at least one revolution of element E.
  • an adjustable timing device not shown
  • shut-off valve 18 will close and the applicator will be retracted from element E upon relative movement of the applicator and base away from one another.
  • the base may continue to be rotated if it is desired to smoothen the applied sealant as edge 265 of the discharge orifice wipes the threads.
  • point of tengency 23 between side wall 22 and threads T traces a circular path 26 about axis 12 of the base which is eccentric relative to a circle 27 which is defined by the radial extent of side wall 22 from axis 16 of the applicator.
  • a single point of tangency 23 is defined by the offetting relationship of axes 12 and 16 so that force F is induced at only this point for effecting the pressing of discharged sealant in place without binding or interference between wall 22 and the threads which could otherwise occur if circles 26 and 27 were concentric.
  • Figures 1 and 4 illustrate pilot 13 as having its central axis lying between axes 12 and 16 so as to define an eccentric circle 28 relative to 26 and 27.
  • the pilot depending on its diameter, can lie with its axis 14 aligned with axis 16, between axes 12 and 16, or to the left of axis 12 (when viewing Figs. 1 and 4).
  • the pilot diameter cannot be smaller than circle 27.
  • a base 11 having an appropriately sized pilot will be selected and mounted in place prior to the coating operation. It can be therefore seen that, for pilot diameters larger than circle 27, point 23 of tangency will be maintained for the same relatively sized applicator with a force F induced for the purpose and in the manner aforedescribed.
  • the base may be formed as a chuck 29 for snugly embracing element E, shown in Figure 5.
  • pilot 13 is eliminated, although axes 12 and 16 are offet for inducing a side load force F at a point of tangency 23 similarly as described with reference to Figures 1 to 4.
  • the chuck jaws holding element E vary in size for different chucks to accommodate differently sized elements to be coated.
  • an applicator of the present type is that it better accommodates the preferred type of sealant which is in the form of an anaeorbic adhesive enclosed with a mass of tiny crushable capsules in a viscous liquid carrier.
  • sealant which is in the form of an anaeorbic adhesive enclosed with a mass of tiny crushable capsules in a viscous liquid carrier.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Coating Apparatus (AREA)

Claims (9)

1. Vorrichtung zum Aufbringen eines überzuges auf das Gewinde eines Elementes, das eine kreisförmige Gewindebohrung aufweist, umfassend einen hohlen Überzugs-Applikator (15) mit einer zentralen Achse sowie einer in einer Seitenwand (22) befindlichen überzugs-Abgabe-Düse (21), die in einem vorgegebenen radialen Abstand zur Achse liegt sowie einer Basis (11) zum Halten des Elementes, wobei die Basis (11) und der Applikator (15) derart relativ zueinander in Achsrichtung und quer hierzu bewegbar sind, bis eine wirksame Überzugs-Auftrags-Position erreicht ist, in welcher die Seitenwand des Applikators (15) das Gewinde des Elementes berührt, dadurch gekennzeichnet, daß die Seitenwand des Applikators, die in wirksamer Auftragsposition das Gewinde des Elementes berührt, eine glatte und gewindefreie Außenfläche aufweist, und daß die Basis in der wirksamen Überzugs-Auftrags-Position um eine Achse verdrehbar ist, die parallel zur Applikatorachse, aber gegen diese versetzt angeordnet ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Bais aus magnetischem Werkstoff besteht und auf ihrer oberen Seite ein Führungsstück zum Halten und Positionieren des aus ferromagnetischem Material bestehenden Elementes durch Magnetkraft aufweist, oder daß die Basis ein Futter zum Halten und Positionieren des Elementes umfaßt.
3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Düse in Richtung der Applikatorachse langgestreckt ist, um eine Mehrzahl von Geweindegängen zu umfassen.
4. Vorrichtung nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß die Düse (21) eine. Seitenkante (25) aufweist, die eine Schaberklinge zum Glätten von auf das Gewinde aufgetragenem Überzug aufweist.
5. Verfahren zum Auftragen eines Überzugs auf das Gewinde eines Elementes mit einer kreisförmigen Gewindebohrung, umfassend das Halten des Elementes auf einer Basis (1) zwecks Bewegung mit dieser, Vorsehen eines hohlen Auftragsapplikators (15), der eine zentrale Achse hat, ferner eine Seitenwand (22), durch welche sich eine Auftrags-Abgabe-Düse (21) hindruch erstreckt, die in einem vorbestimmten radialen Abstand zur Achse liegt, durch Bewegen von Basis und Applikator relativ zueinander entlang der Achse und quer hierzu, bis eine wirksame Überzugs-Auftrags-Position erreicht ist, in welcher die Seitenwand des Applikators das Gewinde des Elementes berührt, und durch Abgeben des Überzugs durch die Düse auf das Gewinde, dadurch gekennzeichnet, daß die Seitenwand des Applikators, die in wirksamer Uberzugs-Auftrags-Position des Gewinde des Elementes berührt, mit einer glatten und gewindefreien Außenfläche ausgestattet wird sowie durch Verdrehen der Basis während des Auftragens des Überzuges um eine Drehachse, die zur Applikatorachse parallel, aber gegen diese versetzt verläuft.
6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, daß überschüssiger überzug von den Gewindegängen durch eine Kante (25) der Düse abgewischt wird, die während der Verdrehung eine Schaberklinge bildet.
7. Verfahren nach Anspurch 5 oder 6, dadurch gekennzeichnet, daß das Abgeben des Überzugs eine Mehrzahl von Gewindegängen zwecks gleichzeitigen Aufbringens von überzug auf diese umfaßt.
8. Verfahren nach einem der Ansprüche 5-7, dadurch gekennzeichnet, daß das Element auf der Basis magnetisch gehalten wird.
9. Verfahren nach einem der Ansprüche 5-8, dadurch gekennzeichnet, daß die Basis als Futter zum Halten des Elementes ausgebildet ist.
EP19820301595 1982-03-26 1982-03-26 Methode und Vorrichtung zum Aufbringen eines Überzuges auf ein inneres Schraubgewinde eines Befestigungselementes Expired EP0090103B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE8282301595T DE3272972D1 (en) 1982-03-26 1982-03-26 Method and device for coating internal threads of a fastener
EP19820301595 EP0090103B1 (de) 1982-03-26 1982-03-26 Methode und Vorrichtung zum Aufbringen eines Überzuges auf ein inneres Schraubgewinde eines Befestigungselementes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19820301595 EP0090103B1 (de) 1982-03-26 1982-03-26 Methode und Vorrichtung zum Aufbringen eines Überzuges auf ein inneres Schraubgewinde eines Befestigungselementes

Publications (2)

Publication Number Publication Date
EP0090103A1 EP0090103A1 (de) 1983-10-05
EP0090103B1 true EP0090103B1 (de) 1986-09-03

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EP19820301595 Expired EP0090103B1 (de) 1982-03-26 1982-03-26 Methode und Vorrichtung zum Aufbringen eines Überzuges auf ein inneres Schraubgewinde eines Befestigungselementes

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EP (1) EP0090103B1 (de)
DE (1) DE3272972D1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3433315A1 (de) * 1984-09-11 1986-03-13 Wolters, Peter, 2370 Rendsburg Vorrichtung zum beschichten von spinnzylindern
FR2757092B1 (fr) * 1996-12-18 1999-01-08 Commissariat Energie Atomique Dispositif d'application d'un liquide a un objet, application au brassage d'un materiau solide dans un porte-echantillon

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3416492A (en) * 1967-04-21 1968-12-17 Internat Fastener Corp Coating apparatus for threaded fasteners
FR1573890A (de) * 1968-01-09 1969-07-11
IT994714B (it) * 1972-09-29 1975-10-20 Fischer Ag Georg Procedimento e dispositivo per l applicazione di una massa di tenuta su parti da collegare
US4268544A (en) * 1978-04-03 1981-05-19 The Oakland Corporation Method of applying friction materials to threaded article
FR2467638A1 (fr) * 1979-10-23 1981-04-30 Psm Fasteners Ltd Procede et appareil pour l'application d'un revetement au filetage d'organes d'attache

Also Published As

Publication number Publication date
EP0090103A1 (de) 1983-10-05
DE3272972D1 (en) 1986-10-09

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