Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
  • B29C45/16—Making multilayered or multicoloured articles
  • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
  • B29C45/1645—Injecting skin and core materials from the same injection cylinder, e.g. mono-sandwich moulding
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
  • F16L3/22—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals
  • F16L3/221—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals having brackets connected together by means of a common support
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
  • F16L3/22—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals
  • F16L3/223—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals each support having one transverse base for supporting the pipes
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L3/00—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets
  • F16L3/22—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals
  • F16L3/237—Supports for pipes, cables or protective tubing, e.g. hangers, holders, clamps, cleats, clips, brackets specially adapted for supporting a number of parallel pipes at intervals for two pipes
• • 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
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/02—Energy absorbers; Noise absorbers
  • F16L55/033—Noise absorbers
  • F16L55/035—Noise absorbers in the form of specially adapted hangers or supports
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
  • B29L2031/00—Other particular articles
  • B29L2031/24—Pipe joints or couplings

Definitions

• the invention relates to a process for production of a fastener for an elongated object by use of a sandwich injection molding process, in particular of the mono- sandwich type.
• the invention also relates to a fastener for an elongated object produced according to the process, which has an object holder and a fastening section.
• the so-called mono-sandwich injection molding process for production of stratified objects from synthetic material is disclosed in, among other sources, DE 2,353,818 A1. In this process, two unlike components of synthetic material are fed, in a suitable stratification, into a melting and injection cylinder and then pressed, one after the other, into the cavity of an injection mold by the latter.
• the component first pressed into the cavity forms a skin or thin layer on the walls of the cavity, on the inner side of which the following second component rests.
• a sandwich part is produced, the surface of which is formed wholly or partially of the component first injected and the core of which consists of the second component.
• the mono-sandwich injection molding process was developed in order to be able to use high-grade synthetic material as sparingly as possible and only at those places at which high-grade material is required for the sake of appearance or for some other reason.
• the process is used to produce for example high-quality parts of synthetic material for the interior of motor vehicles, such as handles or the like, in which the core region consists of a hard synthetic material for obtaining the static properties necessary for function and the visible and graspable outer region consists of a soft synthetic material.
• a holding region for mounting the fastening element on a supporting member may be produced from a harder synthetic material and a bearing region for accommodation of the elongated object with an inlay of a softer synthetic material may be provided.
• the inlay may be connected with the bearing region of the fastener in the so-called two-component injection molding process.
• the two-component injection molding process in contrast to the mono-sandwich injection molding process, first the part consisting of the harder component is molded and then, by repositioning of the injection-molded piece, by displacement of a tool part into a new position or by withdrawal of a core of the cavity for subsequent injection, the second component is procured.
• the object of the invention is to indicate a process for production of a fastener for elongated objects, consisting of two components of synthetic material, which is low-cost and permits short cycle times.
• the process is designed to improve adhesion between the sections of the fastener consisting of unlike synthetic material components.
• this object is accomplished by use of a sandwich injection molding process for production of a fastener for an elongated object, where the fastener has a section that forms an object holder, and a fastening section, where in addition a given quantity of a first synthetic material component for forming a surface part and a second synthetic material component for forming a core part are fed into a melting and injection cylinder and then are continuously pressed, one after the other, out of the cylinder into a mold cavity forming the fastener, in a stratification such that the first synthetic material component reaches the mold cavity before the second synthetic material component and forms a surface part in the region of the object holder and the second synthetic material component forms a core part, which is connected substance-lockingly with the surface part and comprises the object holder and the fastening section.
• the fastening section consists substantially exclusively of the core part component, in order to be able to withstand high holding forces in fastening.
• the second synthetic material component for formation of the core part preferably is a hard component.
• the first synthetic material component preferably is a soft component, which stabilizes the object held in the holder and increases resistance to displacement.
• the surface part in the form of a thin skin can cover fairly great sections of the fastener, in order to lend the latter surface properties differing from the properties of the core part.
• the surface part is formed only in the region of the object holder.
• the gate is also advantageous when the gate is designed as a constricted film gate.
• a fastener that has a fastening section designed as a sleeve for the accommodation of a bolt where one end of the sleeve is closed off by a bottom, it is advantageous when the gate is located on the bottom of the sleeve. In this way, a ring-shaped section is formed at the opposite, open end of the sleeve, as surface part.
• Figure 1 shows a perspective representation of a first fastening element with a parallelepiped fastening section, Figure 2, a side view of the fastener of Figure 1 , partially sectioned,
• FIG 3 a second fastener with a sleeve-like fastening section
• Figure 4 a side view of the fastener of Figure 3, partially sectioned
• Figure 5 a perspective view of a third fastener with a sleeve-like fastening region closed at one end
• Figure 6 a side view of the fastener of Figure 5, partially sectioned
• Figure 7 a perspective view of a fourth fastener with a sleeve-like fastening region and holding fingers
• Figure 8 a side view of the fastener of Figure 7, partially in section, Figure 9, a side view of a fifth fastener, partially sectioned, and Figure 10, a schematic representation of a device for performing a mono- sandwich injection molding process.
• the mono-sandwich injection molding process is generally known and before description of the examples will be briefly explained by the injection molding device represented schematically in Figure 10.
• the device comprises a main injection unit 100 and a charging unit 101.
• the injection unit consists essentially of a filling funnel 102, a heated screw cylinder 103 with enclosed screw and a path-measuring system 104, by which the path covered by the screw in the cylinder 103 can be measured.
• the charging unit has substantially the same design and comprises a filling funnel 105 and a screw cylinder 106 with enclosed screw.
• the feed channels of the injection unit 100 and the charging unit 101 are connectable by a three-way valve 107.
• the injection unit is essentially of a filling funnel 102, a heated screw cylinder 103 with enclosed screw and a path-measuring system 104, by which the path covered by the screw in the cylinder 103 can be measured.
• the charging unit has substantially the same design and comprises a filling funnel 105 and a screw
• valve 100 is connectable by the valve 107 to a mold cavity of an injection mold 108.
• the funnel 102 of the injection unit 100 is filled with the component for the core part and the funnel 105 of the charging unit 101 is filled with the component for the surface part. In both units, the components are melted by heating.
• a defined quantity of the surface component is conducted through the charging unit 101 by the appropriately switched three-way valve 107 into the front nozzle region of the screw cylinder 103 of the injection unit 100, owing to which the core component 109 found therein is pushed back and in the screw cylinder 102 a plug is formed from the surface component 1 10.
• the three-way valve 107 is switched in such a way that the feed channel of the charging unit 101 is closed off and the feed channel of the injection unit 100 is opened to the cavity of the injection mold 108.
• the screw of the injection unit 100 By operation of the screw of the injection unit 100, first the surface component 110 and then the core component 109 are then injected into the mold cavity.
• the surface component 110 first spreads out primarily into the regions of the mold cavity near the point of injection and reaches the regions of the mold cavity further from the point of injection only when the quantity of surface component previously loaded into the injection unit 100 is sufficient to do so.
• Spread of the surface component can thus be selectively influenced by the load quantity of the surface component and by the design of the mold cavity. When the load quantity of the surface component has been consumed, the remaining sections of the mold cavity, including their surfaces, will be filled exclusively by the core component.
• Figures 1 and 2 show a first fastener 10, which has a central fastening section 1 1 and two object holders 12 located in symmetrical arrangement on opposite sides of the fastening section 1 1.
• the fastening section 1 1 consists of a parallelepiped hollow body, which on its underside 13 has an opening for the introduction of a fastening bolt.
• the fastening section 11 is closed by walls 14, 15.
• walls 16 are in each instance pierced by two longitudinal parallel slots 17.
• locking ribs 18 are formed on the walls 15, which extend in the direction of the upper wall 14 and act to hold the fastening section 1 1 on a threaded bolt.
• the holders 12 each have a circular cylindrical, continuously curved wall 19, which extends over an angle of about 280°.
• the axes of curvature of the walls 19 lie in a plane that intersects the longitudinal axis of the fastening section 1 1 at right angles.
• the opposite peripheral ends 20, 21 of each curved wall 19 are provided with surfaces 22, 23 broadened in the radial direction and extending substantially radially, which limit a wedge-shaped feed slot 24 narrowing toward the axis of curvature, through which an object to be held, for example a tube, can, with widening of the curved wall 19, be pressed into the holder 12.
• the curved wall 19 has on its concave inner side in the center region a flat rib 25 extending in the peripheral direction, by which an increase in the wall thickness in this region is produced.
• a plurality of ribs 26, projecting inward and extending parallel to the axis of curvature, are provided, which serve for support of the object to be held.
• the ribs 26 are higher than the rib 25 and extend beyond the rib 25.
• the curved walls 19 are connected with the fastening section 11 by two parallel crosspieces 27.
• the crosspieces 27 extend over the entire axial length of the curved walls 19 and are tied to the walls 15 of the fastening section 11 , the ends of which project over them.
• the thickness of the crosspiece 27 in the regions bridging the intermediate spaces between the curved walls 19 and the walls 15 is kept small for reasons relating to injection technology, as will be explained below.
• a film gate 28 which extends over the axial length of the walls 19 and has the form of a thin-walled rib with a bead-like thickened end.
• the film gate 28 produces a more uniform flow front over the width and hence better distribution of in particular the surface component.
• On the outside the curved walls 19 are in addition provided with a reinforcing rib 29, which extends in approximately the center from the lower crosspiece 27 downward to the contact plane defined by the lower end of the fastening section 11.
• the surface part O forms a thicker bead primarily at the radially inner edges of the surfaces 22, 23.
• This definition of the core part K and surface part O was obtained by control of the injection molding process and by the geometric design of the fastener 10.
• the central rib 25 in addition also contributes substantially to spread of the surface component into the axial marginal zones of the holder 12. Further, it has been found that the surface component fills the ribs 26 almost completely, and is also no longer forced out of the latter by the following component of the core part.
• the fastening section 11 consists exclusively of the component of the core part.
• Hard synthetic material for example a polyamide
• a soft synthetic material for example TPE, which has rubber elastic properties, is selected so that, owing to the ribs 26 and the thickenings at the edge of the surfaces 22, 23, vibration-damping support of the object held by the holder 12 is obtained.
• the layer of soft synthetic material component makes for good haptics and for stable bracing at the support part.
• FIGS 3 and 4 show a fastener 30, which is like the fastener 10 in its basic construction, but which differs from it by the following features, considered in detail below.
• the fastener 30 has a sleeve-like fastening section 31 and two object holders 32, 33, which have diameters differing from one another.
• the two holders 32, 33 in each instance have a curved wall 34, 35, which extends over an angle of more than 280°.
• one end of the walls 34, 35 is connected by two parallel crosspieces 36, 37 with the fastening section 31.
• the crosspieces 37 run approximately tangential to the curved walls 34, 35 and at an angle of 30° to the longitudinal axis of the fastening section 31.
• the crosspieces 36 have a first section parallel to the crosspieces 37 and a section substantially perpendicular to the longitudinal axis of the fastening section, by which they are connected to one end of the respective wall 34, 35.
• the curved walls 34, 35 in each instance have in the center a flat rib 38, raised inward, which extends in the peripheral direction and is limited in the axial direction on both sides by two steps located spaced apart.
• the two walls 34, 35 have on their inner side a plurality of ribs 39, extending axially and projecting inward, which are higher than the rib 38.
• the curved wall 34 is in addition provided on the outer side in its center with a reinforcing rib 40.
• the curved wall 35 has a reinforcing rib 45 on the outer side, in a peripheral section of about 90° adjoining the crosspiece 37.
• the two outer peripheral ends of the walls 34, 35 are provided with wide faces 41 , 42 extending substantially radially, which are formed by shoulders 43, 44 extending radially outward.
• the melted synthetic material components are injected, one after the other, through gates at the shoulders 43, 44 into the corresponding mold. Via the laterally stepped rib 38, this results in good distribution of the component for formation of the surface part over the walls of the object holders 32, 33 and virtually complete filling of the ribs 39.
• a cylindrical sleeve 51 closed off at the upper end by a bottom 52, forms the fastening section.
• the latter has two crosspieces 53, 54, arranged spaced apart and perpendicular to the central axis of the sleeve 51 , which have the shape of rectangular plates, in the center of which is found the sleeve 51.
• the crosspieces 53, 54 are in each instance connected with an object holder 55.
• the holders 55 correspond in their design, except for the differences indicated below, to the holders 12 of the fastener 10.
• the object holders 55 do not have a film gate and have at their outer side at the bottom in the center a rib 56 projecting outward and extending in the direction of the axis of curvature.
• the open end 58 of the sleeve 51 projects on the underside of the lower crosspiece 54 by a small amount from the latter and with its face forms a contact surface 57, which lies in a plane touching the ribs 56.
• the fastener 50 is designed so that it can be molded by a mono-sandwich injection molding process from a central gate lying on the bottom 52.
• the sleeve 51 is formed substantially only by the second core component, while however at the lower sleeve end 58, projecting from the crosspiece 54, a uniformly formed ring is produced from the surface component, which forms the contact surface 57.
• the surface component forms the ribs 56 and also the inner-lying ribs 59 of the object holder 55 as in the fastener 10.
• a fastener is procured in which the contact surface 57 and the ribs 56 serving for support consist of a soft surface component, in order to obtain an elastically yielding and protective support of the fastener on the part holding it.
• a fastener 60 which has a fastening section in the form of a cylindrical sleeve 61 closed at one end.
• a fastening section in the form of a cylindrical sleeve 61 closed at one end.
• the two holders 63, 64 have a substantially semi- cylindrical groove 66, formed of a curved wall 65.
• the central axes of the groove 66 lie in a plane common to the central axis of the sleeve 61 and parallel to the crosspieces 62.
• the groove 66 Formed on the edges of the groove 66 are walls 67, 68 parallel to each other, which extend upward from the groove 66 and at their upper edges bear springy holding fingers 69.
• the holding fingers 69 project into the interspace between the walls 67, 68 and extend in the direction of the groove 66, so that an object inserted in the groove 66 can be held in it by the holding fingers 69.
• the holders 63, 64 Owing to the walls 68, which are adjacent to the sleeve 61 , the holders 63, 64 are connected with the crosspieces 62.
• the curved walls 65 On their outer side, the curved walls 65 in each instance have a rib 70 projecting downward and extending centrally and in the longitudinal direction of the groove 66.
• the rib 70 intersects, at right angles, a central reinforcing rib 71 , which extends under the wall 65 to under the walls 67, 68.
• the lower front edges of the ribs 70 and the reinforcing ribs 71 of the two holders 63, 64 lie in a common plane with the lower edge of the sleeve 61.
• these ribs 72 prolonged upward, are formed at the edges of the groove 66.
• raised beads 73 which extend in the longitudinal direction of the groove 66.
• the two synthetic material components are injected at the intersections of the ribs 70 with the reinforcing ribs 71 into the corresponding mold cavity.
• the first component for formation of the surface part is distributed substantially on the surfaces of the curved wall 65 and the ribs 70, 71 , 72 formed thereon, while the ribs 72 and the beads 73, because of their small cross sections, are formed almost exclusively from the surface component.
• its previously prepared volume is exhausted, so that the upper regions of the object holders 63, 64, with the holding fingers 69, the crosspieces 62 and the sleeve 61 located in their center, are formed exclusively by the following component for the core part.
• the effect of the soft component provided for the surface part is therefore substantially limited to the contact surfaces for the objects to be held in the region of the groove 66 and to the contact surfaces formed by the ribs 70, 71 for the support part to be connected with the fastener.
• the sleeve 61 for the accommodation of a fastening bolt and the crosspieces 62 and the holding fingers 69, which are designed for the accommodation and transmission of the holding forces, are formed of a hard core component.
• FIG 9 shows a fastener 80, which is designed for fastening two lines or comparable objects to each other.
• the fastener 80 has two object holders 81 , 82 spaced apart, which are connected together by a connecting crosspiece 83.
• the holders 81 , 82 are substantially like the holders 55 of the fastener 50.
• the two synthetic material components are simultaneously injected into the mold cavity in the sequence prescribed by the injection molding process and at like delivery speed at two gates 84, 85.
• the quantity of the first, soft synthetic material component is sized so that the surfaces of the two object holders 81 , 82 and of the connecting crosspiece 83 are coated with a skin of the first component of synthetic material forming the surface part O.
• the surface component brought from both sides forms a continuous wall 86, which separates the core parts K1 , K2 of the holders 81 , 82, formed from the hard core component, from each other.
• a continuous wall 86 which separates the core parts K1 , K2 of the holders 81 , 82, formed from the hard core component, from each other.
• an elastically yielding connecting point is procured between the two holders 81 , 82, which decouples the holders from each other and can dampen any vibration transmission.
• the flexibility of the wall 86 can contribute to facilitating assembly of the fastener 80.

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• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Moulds For Moulding Plastics Or The Like (AREA)
• Injection Moulding Of Plastics Or The Like (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=40874862

Family Applications (1)

Country Status (4)

Cited By (1)

Families Citing this family (5)

Family Cites Families (10)

• 2008
  • 2008-04-25 DE DE200810021021 patent/DE102008021021A1/de not_active Withdrawn
• 2009
  • 2009-04-15 EP EP09734431A patent/EP2276617A1/de not_active Withdrawn
  • 2009-04-15 WO PCT/EP2009/054437 patent/WO2009130146A1/en active Application Filing
  • 2009-04-15 JP JP2011505464A patent/JP5498480B2/ja not_active Expired - Fee Related

Non-Patent Citations (1)

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