US20020096877A1 - High-pressure integral tube coupling arrangements - Google Patents
High-pressure integral tube coupling arrangements Download PDFInfo
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- US20020096877A1 US20020096877A1 US10/103,615 US10361502A US2002096877A1 US 20020096877 A1 US20020096877 A1 US 20020096877A1 US 10361502 A US10361502 A US 10361502A US 2002096877 A1 US2002096877 A1 US 2002096877A1
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- United States
- Prior art keywords
- tube
- fitting
- coupling
- hose
- radial projection
- 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.)
- Abandoned
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Classifications
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- 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
- F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
- F16L33/20—Undivided rings, sleeves or like members contracted on the hose or expanded in the hose by means of tools; Arrangements using such members
- F16L33/207—Undivided rings, sleeves or like members contracted on the hose or expanded in the hose by means of tools; Arrangements using such members only a sleeve being contracted on the hose
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/04—Arrangements of piping, valves in the piping, e.g. cut-off valves, couplings or air hoses
- B60T17/043—Brake line couplings, air hoses and stopcocks
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- 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
- F16L13/00—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints
- F16L13/14—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling
- F16L13/141—Non-disconnectible pipe-joints, e.g. soldered, adhesive or caulked joints made by plastically deforming the material of the pipe, e.g. by flanging, rolling by crimping or rolling from the outside
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- 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
- F16L33/00—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses
- F16L33/22—Arrangements for connecting hoses to rigid members; Rigid hose connectors, i.e. single members engaging both hoses with means not mentioned in the preceding groups for gripping the hose between inner and outer parts
Definitions
- the present invention relates to high-pressure integral tube coupling arrangements. More particularly, the present invention relates to such arrangements for coupling flexible hoses, such as a reinforced rubber hoses to metal tubes for use in systems such as vehicle brake and clutch systems.
- Brazing a tube onto a hose fitting is one approach. Since these couplings are frequently exposed when used with brake systems, clutches and hoses, they are subject to environmental degradation because of moisture, road salt, wide temperature fluctuations and mechanical impacts and vibrations, all of which combine to accelerate corrosion. In order to protect brazed joints from corrosion, it is necessary to plate the assemblies which is in and of itself a relatively expensive undertaking. Moreover, these assemblies frequently require parts which have multiple elements each of which has the potential to provide a leak path and each of which must be handled and stored.
- the present invention is directed to a coupling arrangement for connecting a tube to a hose wherein the tube has a main portion and an insertion portion, the insertion portion being inserted through the fitting into the hose.
- the tube further has at least a first outwardly extending radial projection which cooperates with the fitting, the insertion portion of the tube extending beyond the radial projection to the terminus of the tube.
- the fitting has a first portion with a bore for receiving the tube therethrough and a second portion extending axially from the first portion for receiving the hose therein, with an interior surface on the first portion facing the second portion.
- the tube is disposed in the bore of the fitting with the outwardly extending projection abutting the interior surface on the first portion and the insertion portion extending into the second portion of the tube for insertion into the hose.
- the fitting includes a second abutment surface thereon facing away from the second portion for opposing axial movement of the tube toward the second portion of the fitting, and in a still further aspect, the portion of the tube engaged by the second abutment surface is on the first projection.
- the second abutment surface is on a portion of the fitting which is radially and axially deformed into abutment with the second abutment surface.
- the second axially extending abutment is at a radially extending end of the fitting.
- the second portion of the fitting is a crimping collar for radially engaging the hose while the insertion portion of the tube is within the hose.
- the main portion of the tube is covered with a layer of deformable protective material with the insertion portion and radially extending radial protection being uncoated.
- a metal-to-metal seal between the fitting and the uncoated radial projection.
- the deformable protective material may be pressed into the fitting to provide a sealing area.
- FIG. 1 is a perspective view of a prior art arrangement for joining a metal tube to a flexible hose
- FIG. 2 is a side view, mostly in elevation, showing a first embodiment of a prior art threaded coupling used to join a tube to a hose;
- FIG. 3 is a side view, mostly in elevation, showing a second embodiment of a prior art threaded coupling used to join a metal tube to a hose;
- FIG. 4 is a side elevation of a prior art brazed joint used to couple a metal tube to a flexible hose;
- FIG. 5 is a side view, mostly in elevation, showing a first embodiment of a coupling in accordance with the present invention utilized to couple metal tube to a flexible hose;
- FIGS. 6 A- 6 D are side views, mostly in elevation, illustrating the fabrication and assembly of the coupling of FIG. 5;
- FIG. 7 is a side elevation showing the tube of the present invention, but for clarity illustrated without the fitting;.
- FIG. 8 is a side elevation of a fitting shown in FIGS. 5, 6B and 6 D showing an embodiment of the fitting with pockets for receiving beads formed on the tube;
- FIG. 9 is a side elevation of a second embodiment of the fitting of FIGS. 5, 6B and 6 D having no pockets for receiving beads on the tube;
- FIG. 10 is a side elevation showing a third embodiment of the invention.
- FIG. 11 is a side elevation of a fourth embodiment of the invention.
- FIGS. 12 A-D are side elevation views showing a preferred assembly technique for embodiment of the invention illustrated in FIG. 11.
- FIGS. 1 - 4 Prior Art Arrangements: FIGS. 1 - 4
- FIG. 1 there is shown a prior art coupling arrangements 19 for connecting relatively small diameter tubes 20 such as brake tubes to fittings 21 by threaded insert-type connections 22 .
- the fittings 21 are crimped to a hose 23 which carries relatively high pressure hydraulic fluid.
- a part of a truck chassis or frame 24 retains the coupling 19 thereon with a bracket 25 to hold the coupling rigid with respect to the frame.
- the hose 23 is relatively flexible and may be retained to other portions of the chassis by clamps while the tubes 20 may also be retained to the chassis 24 by clamps 25 .
- One of the tubes 20 is attached to a hydraulically driven device such as a brake caliper 28 in a disk brake 29 .
- the present invention replaces the couplings 19 with a more reliable and more economical coupling arrangements. While a disk brake 29 is shown in FIG. 1, the invention has other uses for other types of hydraulic connections such as connections for clutches, and any other arrangement in which a flexible hose is connected to a rigid tube.
- FIGS. 2 and 3 show in more detail the prior art coupling 19 of FIG. 1, it is seen that the threaded nut 22 is received in a threaded recess 31 of the fitting 21 while the hose 23 is crimped to the fitting via a crimping collar 32 .
- the tube 20 has a flared end 33 and the fitting 21 has an inverted or convex seat 34 .
- the fitting 21 ′ has a concave seat 34 ′ which receives a bubble end 33 ′ of the tube 20 ′.
- FIG. 4 in an attempt to avoid the expense and minimize the difficulties of a coupling 19 , such as the coupling of FIGS. 2 and 3, wherein an externally threaded nut 22 , 22 ′ must be threaded into a threaded bore 31 , 31 ′, the tube 20 ′′ of FIG. 4 is press-fitted into a smooth recess 31 ′′ of a fitting 21 ′′ and copper brazed at juncture 36 .
- the fitting 21 ′′ is then plated, which requires plating of an assembly that has the relatively long portion of the tube 20 ′′ attached to the fitting 21 ′′.
- the arrangement of FIG. 4 also tends to use an insertion tube 37 , which results in more part-to-part junctures that increase the number of potential leak paths.
- the present invention eliminates a need to physically join the components of the tube-to-hose couplings by hand at assembly plants, as well as reducing leak paths, component costs and part number counts. Moreover, as opposed to brazed tube designs, such as that of FIG. 4, tolerance control is increased, as is routing control.
- a high pressure integral tube coupling 40 enables a direct connection between a metal tube 50 and a flexible hose 23 (see FIG. 1), such as a high pressure resistant rubber hose, without a need for rotating threaded coupling components or brazing, thus eliminating parts or steps while retaining their function.
- the metal tube 50 is positioned within a body portion 51 of a fitting 52 to which the hose 23 of FIG. 1 is subsequently coupled by deforming a crimping collar 53 therearound so that the hose is axially retained within the fitting 52 and is radially sealed against an end portion 54 of the tube.
- the tube 50 corresponds to the tubes 20 shown in the prior art arrangements of FIGS. 1 - 4 and has an internal diameter of about 0.1250 inch, which internal diameter could range from about 0.125 to about 0.145 inch.
- a back bead 56 is preferably seated within an annular bead pocket 58 formed in a back end 59 of the fitting 52 while a front bead 60 is preferably seated in a pocket 62 formed in front end 63 of the fitting located just before the crimping collar 53 .
- a smooth bore 66 extends completely through the fitting 52 into a cylindrical space 68 defined by the crimping collar 53 . While the pockets 58 and 62 are preferable, it is within the scope of this disclosure to form the coupling without the pockets by crimping the tube 50 directly against the radial end surfaces of the fitting (See FIG. 9).
- the diameter d 1 of the smooth bore 66 is slightly greater than the diameter d 1 of the tube 50 so that the tube slides through the smooth bore. While the diameter d 1 is slightly larger than the diameter of d 2 , it need only be large enough so that the d 2 will slide readily therethrough. There could, however, be a slight press fit of the tube 50 within the bore 66 .
- the end 54 of the tube 50 has a reduced diameter portion 67 of a diameter d 3 which is slidably receivable within the bore 70 of the hose 23 and is of a length substantially equal to that of the crimping collar 53 . Consequently, the bore 70 of the hose 23 is supported during the crimping step which deforms the material 72 of the hose.
- FIGS. 6 A- 6 D which illustrate the method fabricating and assembling the coupling 40 , it is seen that the metal tube 50 has its end portion 54 drawn to have the reduced diameter d 3 which is less than the diameter d 2 of the tube 50 .
- the back bead 56 is formed by an applied force which pushes a portion 76 of the tube 50 back, thus forming a beaded area in proximity with line 78 .
- the thus deformed tube 50 is inserted through the smooth bore 66 of the fitting 52 so that the back bead 56 fits into the annular bead pocket 58 at the back end 59 of the body 51 of the fitting.
- the annular bead pocket 58 is formed in or machined in the back end 59 of the fitting and has a diameter substantially greater than the diameter d 2 of the smooth bore 66 . It is to be kept in mind that the bead pocket 58 is a desirable but optional feature. Referring now to FIG. 6D in combination with FIG.
- the front bead 60 is then formed by using an applied force to the tube 50 rearwardly so that a portion 80 of the tube 50 deforms into the front bead 60 which seats within the annular front bead pocket 62 at the front end 64 of the body 51 of fitting 52 .
- the structure of the tube 50 in the absence of the fitting 52 is shown in FIG. 7, while the structure of the fitting absent the tube is shown in FIG. 8.
- the coupling 40 is accomplished by two axial deformations of the tube 50 , one prior to inserting the tube 50 into the fitting 52 and the other subsequent to the insertion.
- the final step is to radially crimp the crimping collar 53 which is a conventional one-step procedure. If the arrangement is to be used with the brake line of FIG. 1, the fitting 52 with the tube 50 connected thereto may be first inserted into an opening in the bracket 25 and a sliding clip slid into the annular groove 87 in the fitting 52 . The hose 23 is then inserted in the space 68 in the crimping collar 53 and the crimping collar crimped about the hose.
- the metal tube 50 is made of steel and is pre-coated by SAE-J527 Standards, sliding fit.
- Other materials which may be used are copper, nickel, NYLON® (polyamide) or polyvinyl fluoride. If relatively thick plastic coatings such as NYLON® are used, the coating preferably terminates before the first bead 56 ; however, as is seen in the third embodiment of FIGS. 10 and 11, can continue to bead 60 .
- the barbed or stem structure beyond the beads 56 and 60 has a controlled inside diameter as well as a controlled outside diameter which permits the assembly to pass the Federal Motor Vehicle Safety Standards for minimum fluid passage diameter.
- the barb or stem structure can be produced either with or without annular grooves to increase tensile integrity of the coupling. Since the end 54 of the tube is received directly within the bore 70 of the hose 23 , potential leak paths which occur with additional elements, such as those in prior art threaded connections and brazed tubular supports, are eliminated.
- FIG. 9 there is shown a second embodiment of the invention, wherein the bead pockets 58 and 62 are deleted from the fitting 52 ′ so that beads 56 ′ and 60 ′ press directly against the radially extending back and front end surfaces 80 and 82 , respectively of the fitting 52 ′. Friction between the end surface 80 and back bead 56 and between the front end surface 82 and the front bead 60 prevents rotation of the tube 50 within the fitting. In addition, there is a slight friction fit between the tube 50 and the bore 66 ′ which provides a fluid seal.
- FIG. 10 there is shown a third embodiment of the invention wherein a tube 90 is inserted into a fitting 92 having a crimping collar 93 .
- the tube 90 has a necked down portion 94 joined thereto by a frusto-conical section or tapered 95 .
- the frusto-conical section 95 joins an intermediate section 96 just in front of a bead 97 .
- the fitting 92 has a smooth bore 100 that has an abutment surface 101 defined by an annular shoulder 102 therein that is disposed within in an annular recess 104 .
- the tube 90 is shoved into the fitting 92 (as shown in FIG.
- FIG. 10 The arrangement of the second embodiment of the invention shown in FIG. 10 is used substantially as the arrangement of the first embodiment shown in FIGS. 5 - 9 .
- the embodiment of FIG. 10 is used in situations such as that of FIG. 1 where a flexible hose 23 connects a source of hydraulic fluid to a tube 20 , which tube retains fluid which operates a hydraulic device, such as the calipers of a brake, or a clutch, or any other device requiring high pressure hydraulic fluid delivered via a flexible hose.
- a hydraulic device such as the calipers of a brake, or a clutch, or any other device requiring high pressure hydraulic fluid delivered via a flexible hose.
- FIGS. 11 and 12A-D there is shown a fourth embodiment of the invention wherein a metal tube 200 is coupled to the hose 23 by a fitting 202 to form a coupling 203 .
- the metal tube 200 has a drawn down portion 204 which has a relatively small outside diameter d 1 which is less than the outside diameter d 2 of a main portion 205 of the tube.
- the tube 200 has an annular bead 206 having a first axially facing surface 208 and a second axially facing surface 210 .
- Tube 200 is received through a smooth bore 212 in a body portion 213 of the fitting 202 and, if the metal tube does not have a plastic coating, may have an interference fit.
- Tube 200 is retained within the fitting 202 by abutment between the first surface 208 of the bead 206 with a shoulder 216 adjacent the bore 212 and by a swaged, staked or annular portion 218 of the fitting 202 that forms a second abutment which engages the surface 210 of the bead.
- the fitting 202 and tube 200 are therefore prevented from any axial or rotational movement, one with respect to the other while also being provided with metal-to-metal fluid seals 219 and 216 which prevent entry of moisture and corrosive agents that might degrade the interior of the coupling.
- the main portion 205 of the metal tube 200 is coated or covered with a layer 220 of a plastic material such as, for example, a polyamide, i.e., NYLON®, which layer of plastic material terminates before or at the bead 206 leaving the bead uncoated for the metal-to-metal seal 219 with the fitting as well as leaving the small diameter portion 204 uncoated for ready receipt in the bore of the hose 23 .
- plastic materials which may be used are polyvinylfluoride or polypropylene.
- a preferred example of a tube configuration for the tube 200 comprises a base tube of SAE 1008/1010 mild steel with a layer of copper plating over which is a 10-15 ⁇ m 95% zinc/5% aluminum hot dip coating.
- the layer of plastic material 220 is preferably a layer of polyamide over a binder layer which is on average about 3.5 ⁇ m thick.
- tube 200 is provided.
- Tube 200 is drawn to provide the small diameter portion 204 and to form frusto-conical portion 222 which joins the small diameter portion 201 to the remainder of the tube 200 .
- the tube is deformed by pressing axially against the tube so that it bulges outwardly to form the bubble 206 generally in the location of the frusto-conical portion 222 . If the entire tube 200 has previously been coated with a plastic layer 220 , the plastic layer is stripped from the insertion portion 204 and the bead 206 prior to drawing.
- the fitting 202 is slid along the length of the tube 200 from its opposite end or, in the alternative, the tube is simply inserted into the bore 212 until the surface 208 on the bead 206 is abutted by the shoulder 216 that is adjacent the end of the bore.
- the fit between the tube 200 and the bore 212 is a sliding fit with the plastic layer 220 sliding within the bore.
- the fit between the tube 200 and bore may be sufficiently tight to form a fluid tight seal. As is seen in FIG.
- the annular portion 218 of the wide portion of the bore 212 is then swaged or staked against the second face 210 of the bead 206 in order to form the coupling 203 which firmly retains the tube 200 within the fitting 202 and forms the metal-to-metal, fluid tight seal 219 therewith.
- the hose 23 (FIG. 11) is inserted into a hollow portion 230 of the fitting 202 which forms a crimping collar that is unitary with the body portion 213 of the fitting.
- the crimping collar 230 is then deformed radially inwardly to retain the hose 23 permanently and non-rotatably in communication with the tube 200 .
- tubes are retained within fittings, such as fittings for joining the tubes to hoses, utilizing mechanical steps which involve neither rotating the tube with respect to the fitting, brazing the tube to the fitting or using a retaining unit.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Transportation (AREA)
- Joints That Cut Off Fluids, And Hose Joints (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
Abstract
Metal tubes, such as the small diameter metal tubes (50) used in hydraulic braking systems, are connected to hoses (23) also used in such systems by fittings (52) which are configured to receive radially projecting beads (62) on the metal tubes (50). Each of the fittings includes a body portion (51) with a bore therethrough and a crimping collar (53) which is unitary with the body portion (51). The body portion (51) receives an insertion end of the tube (50) therethrough, which insertion portion projects into the unitary crimping collar (53). A radially extending bead (62) on the tube is received in a recess adjacent the bore through the body portion (51). In one embodiment, the tube (50) is held in place by another bead (58) which is seated in another recess at the opposite end of the bore.
Description
- The present invention relates to high-pressure integral tube coupling arrangements. More particularly, the present invention relates to such arrangements for coupling flexible hoses, such as a reinforced rubber hoses to metal tubes for use in systems such as vehicle brake and clutch systems.
- In discussing the automotive industry, the Background of U.S. Pat. No.5,037,142 states: “a wide variety of connector devices have been utilized to connect tubes to hoses for conducting fluid therethrough or transmitting a hydraulic force through a column of oil contained therein. in many cases, specialized couplings are required which not only hydraulically connect adjacent tubes or pipes, hoses and other conduits in a fluid-tight manner, but also provide effective support while allowing relative movement of components and providing protection in relatively harsh environments.”
- Current methods for joining hoses to metal tubes still substantially rely on threaded couplings in which an externally threaded hollow nut is threaded into a internally threaded fitting to hold a flared tube tightly within the fitting. Since both the nut and the fitting must be machined, they are relatively expensive. In addition, making the connection is time consuming and labor intensive because it is not conveniently adaptable to automation. Moreover, quality control is difficult because there is the possibility of threaded components being joined without proper alignment so that threads are stripped, resulting in joints that leak and are subject to failure when operated at high pressures over long time periods of time in adverse environments. In view of these difficulties, there have been attempts to form couplings which do not require threaded components. Brazing a tube onto a hose fitting is one approach. Since these couplings are frequently exposed when used with brake systems, clutches and hoses, they are subject to environmental degradation because of moisture, road salt, wide temperature fluctuations and mechanical impacts and vibrations, all of which combine to accelerate corrosion. In order to protect brazed joints from corrosion, it is necessary to plate the assemblies which is in and of itself a relatively expensive undertaking. Moreover, these assemblies frequently require parts which have multiple elements each of which has the potential to provide a leak path and each of which must be handled and stored.
- The technology of coupling hoses and tubes is now generally going to “quick-connect” type couplings in which all that is required to achieve a fluid tight connection is for two components being joined to be axially pushed toward one another, so that there is no need to rotate components of a coupling, one with respect to the other. When coupling metal tubes to rubber hoses, it is the practice to crimp the rubber hose within the coupling which is a rapid, reliable process requiring only a single metal-deforming step once the hose is inserted into the coupling. In order to further simplify assembly so as to reduce cost, it is desirable to simplify connecting the tube to a crimpable fitting.
- In view of the aforementioned considerations, it is a feature of the present invention to provide new and improved tube-to-hose couplings which are reliable, inexpensive and yet require manufacturing steps which are minimal and do not introduce difficulties of their own.
- In view of this feature and other features, the present invention is directed to a coupling arrangement for connecting a tube to a hose wherein the tube has a main portion and an insertion portion, the insertion portion being inserted through the fitting into the hose. The tube further has at least a first outwardly extending radial projection which cooperates with the fitting, the insertion portion of the tube extending beyond the radial projection to the terminus of the tube. The fitting has a first portion with a bore for receiving the tube therethrough and a second portion extending axially from the first portion for receiving the hose therein, with an interior surface on the first portion facing the second portion. The tube is disposed in the bore of the fitting with the outwardly extending projection abutting the interior surface on the first portion and the insertion portion extending into the second portion of the tube for insertion into the hose.
- In a further aspect, the fitting includes a second abutment surface thereon facing away from the second portion for opposing axial movement of the tube toward the second portion of the fitting, and in a still further aspect, the portion of the tube engaged by the second abutment surface is on the first projection.
- In a further aspect, the second abutment surface is on a portion of the fitting which is radially and axially deformed into abutment with the second abutment surface.
- In still a further aspect, the second axially extending abutment is at a radially extending end of the fitting.
- In a further aspect, the second portion of the fitting is a crimping collar for radially engaging the hose while the insertion portion of the tube is within the hose.
- In still a further aspect of the invention, the main portion of the tube is covered with a layer of deformable protective material with the insertion portion and radially extending radial protection being uncoated. In accordance with this aspect of the invention, there is a metal-to-metal seal between the fitting and the uncoated radial projection. On the other hand, the deformable protective material may be pressed into the fitting to provide a sealing area.
- Various other features and attendant advantages of the present invention will be more fully appreciated as the same becomes better understood when considered in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the several views, and wherein:
- FIG. 1 is a perspective view of a prior art arrangement for joining a metal tube to a flexible hose;
- FIG. 2 is a side view, mostly in elevation, showing a first embodiment of a prior art threaded coupling used to join a tube to a hose;
- FIG. 3 is a side view, mostly in elevation, showing a second embodiment of a prior art threaded coupling used to join a metal tube to a hose;
- FIG. 4 is a side elevation of a prior art brazed joint used to couple a metal tube to a flexible hose;
- FIG. 5 is a side view, mostly in elevation, showing a first embodiment of a coupling in accordance with the present invention utilized to couple metal tube to a flexible hose;
- FIGS.6A-6D are side views, mostly in elevation, illustrating the fabrication and assembly of the coupling of FIG. 5;
- FIG. 7 is a side elevation showing the tube of the present invention, but for clarity illustrated without the fitting;.
- FIG. 8 is a side elevation of a fitting shown in FIGS. 5, 6B and6D showing an embodiment of the fitting with pockets for receiving beads formed on the tube;
- FIG. 9 is a side elevation of a second embodiment of the fitting of FIGS. 5, 6B and6D having no pockets for receiving beads on the tube;
- FIG. 10 is a side elevation showing a third embodiment of the invention;
- FIG. 11 is a side elevation of a fourth embodiment of the invention; and
- FIGS.12A-D are side elevation views showing a preferred assembly technique for embodiment of the invention illustrated in FIG. 11.
- Prior Art Arrangements: FIGS.1-4
- Referring now to FIG. 1, there is shown a prior
art coupling arrangements 19 for connecting relativelysmall diameter tubes 20 such as brake tubes tofittings 21 by threaded insert-type connections 22. Thefittings 21 are crimped to ahose 23 which carries relatively high pressure hydraulic fluid. In FIG. 1, a part of a truck chassis orframe 24 retains thecoupling 19 thereon with abracket 25 to hold the coupling rigid with respect to the frame. Thehose 23 is relatively flexible and may be retained to other portions of the chassis by clamps while thetubes 20 may also be retained to thechassis 24 byclamps 25. One of thetubes 20 is attached to a hydraulically driven device such as abrake caliper 28 in adisk brake 29. The present invention replaces thecouplings 19 with a more reliable and more economical coupling arrangements. While adisk brake 29 is shown in FIG. 1, the invention has other uses for other types of hydraulic connections such as connections for clutches, and any other arrangement in which a flexible hose is connected to a rigid tube. - Referring now to FIGS. 2 and 3 which show in more detail the
prior art coupling 19 of FIG. 1, it is seen that the threadednut 22 is received in a threadedrecess 31 of thefitting 21 while thehose 23 is crimped to the fitting via a crimpingcollar 32. In the arrangement of FIG. 2, thetube 20 has aflared end 33 and thefitting 21 has an inverted orconvex seat 34. In the embodiment of FIG. 3, the fitting 21′ has aconcave seat 34′ which receives abubble end 33′ of thetube 20′. The externally threadednut 22′ then threads into the threadedbore 31′ in the same way that the threadednut 22 threads into the threadedbore 31 of FIG. 2. In practice, the arrangements of FIGS. 2 and 3 tend to have multiple components. - Referring now to FIG. 4, in an attempt to avoid the expense and minimize the difficulties of a
coupling 19, such as the coupling of FIGS. 2 and 3, wherein an externally threadednut bore tube 20″ of FIG. 4 is press-fitted into asmooth recess 31″ of a fitting 21″ and copper brazed atjuncture 36. The fitting 21″ is then plated, which requires plating of an assembly that has the relatively long portion of thetube 20″ attached to the fitting 21″. In practice, the arrangement of FIG. 4 also tends to use aninsertion tube 37, which results in more part-to-part junctures that increase the number of potential leak paths. - Embodiments of the Invention: FIGS.5-12
- In order to improve upon the couplings illustrated in FIGS.1-4 as well as other couplings, the present invention eliminates a need to physically join the components of the tube-to-hose couplings by hand at assembly plants, as well as reducing leak paths, component costs and part number counts. Moreover, as opposed to brazed tube designs, such as that of FIG. 4, tolerance control is increased, as is routing control.
- Referring now to the first embodiment of the present invention illustrated in FIGS.5-9, a high pressure
integral tube coupling 40 enables a direct connection between ametal tube 50 and a flexible hose 23 (see FIG. 1), such as a high pressure resistant rubber hose, without a need for rotating threaded coupling components or brazing, thus eliminating parts or steps while retaining their function. As is seen in FIG. 5, themetal tube 50 is positioned within abody portion 51 of a fitting 52 to which thehose 23 of FIG. 1 is subsequently coupled by deforming a crimpingcollar 53 therearound so that the hose is axially retained within the fitting 52 and is radially sealed against anend portion 54 of the tube. Thetube 50 corresponds to thetubes 20 shown in the prior art arrangements of FIGS. 1-4 and has an internal diameter of about 0.1250 inch, which internal diameter could range from about 0.125 to about 0.145 inch. - In order to retain the
tube 50 in the fitting 52, aback bead 56 is preferably seated within anannular bead pocket 58 formed in aback end 59 of the fitting 52 while afront bead 60 is preferably seated in apocket 62 formed infront end 63 of the fitting located just before the crimpingcollar 53. Asmooth bore 66 extends completely through the fitting 52 into acylindrical space 68 defined by the crimpingcollar 53. While thepockets tube 50 directly against the radial end surfaces of the fitting (See FIG. 9). - The diameter d1 of the
smooth bore 66 is slightly greater than the diameter d1 of thetube 50 so that the tube slides through the smooth bore. While the diameter d1 is slightly larger than the diameter of d2, it need only be large enough so that the d2 will slide readily therethrough. There could, however, be a slight press fit of thetube 50 within thebore 66. - The
end 54 of thetube 50 has a reduceddiameter portion 67 of a diameter d3 which is slidably receivable within thebore 70 of thehose 23 and is of a length substantially equal to that of the crimpingcollar 53. Consequently, thebore 70 of thehose 23 is supported during the crimping step which deforms thematerial 72 of the hose. - Referring now to FIGS.6A-6D which illustrate the method fabricating and assembling the
coupling 40, it is seen that themetal tube 50 has itsend portion 54 drawn to have the reduced diameter d3 which is less than the diameter d2 of thetube 50. As is seen in FIG. 6B, theback bead 56 is formed by an applied force which pushes aportion 76 of thetube 50 back, thus forming a beaded area in proximity withline 78. - As is seen in FIG. 6C, the thus
deformed tube 50 is inserted through thesmooth bore 66 of the fitting 52 so that theback bead 56 fits into theannular bead pocket 58 at theback end 59 of thebody 51 of the fitting. Theannular bead pocket 58 is formed in or machined in theback end 59 of the fitting and has a diameter substantially greater than the diameter d2 of thesmooth bore 66. It is to be kept in mind that thebead pocket 58 is a desirable but optional feature. Referring now to FIG. 6D in combination with FIG. 6C, thefront bead 60 is then formed by using an applied force to thetube 50 rearwardly so that aportion 80 of thetube 50 deforms into thefront bead 60 which seats within the annularfront bead pocket 62 at the front end 64 of thebody 51 of fitting 52. The structure of thetube 50 in the absence of the fitting 52 is shown in FIG. 7, while the structure of the fitting absent the tube is shown in FIG. 8. - In the first embodiment of the invention, it is seen that the
coupling 40 is accomplished by two axial deformations of thetube 50, one prior to inserting thetube 50 into the fitting 52 and the other subsequent to the insertion. The final step is to radially crimp the crimpingcollar 53 which is a conventional one-step procedure. If the arrangement is to be used with the brake line of FIG. 1, the fitting 52 with thetube 50 connected thereto may be first inserted into an opening in thebracket 25 and a sliding clip slid into the annular groove 87 in the fitting 52. Thehose 23 is then inserted in thespace 68 in the crimpingcollar 53 and the crimping collar crimped about the hose. By having a press fitting between thetube 50 and the fitting 52, rotation of the fitting relative to the tube is eliminated while maintaining a fluid tight seal. - Preferably, the
metal tube 50 is made of steel and is pre-coated by SAE-J527 Standards, sliding fit. Other materials which may be used are copper, nickel, NYLON® (polyamide) or polyvinyl fluoride. If relatively thick plastic coatings such as NYLON® are used, the coating preferably terminates before thefirst bead 56; however, as is seen in the third embodiment of FIGS. 10 and 11, can continue to bead 60. The barbed or stem structure beyond thebeads end 54 of the tube is received directly within thebore 70 of thehose 23, potential leak paths which occur with additional elements, such as those in prior art threaded connections and brazed tubular supports, are eliminated. - Referring now to FIG. 9, there is shown a second embodiment of the invention, wherein the bead pockets58 and 62 are deleted from the fitting 52′ so that
beads 56′ and 60′ press directly against the radially extending back and front end surfaces 80 and 82, respectively of the fitting 52′. Friction between theend surface 80 and backbead 56 and between thefront end surface 82 and thefront bead 60 prevents rotation of thetube 50 within the fitting. In addition, there is a slight friction fit between thetube 50 and thebore 66′ which provides a fluid seal. - Referring now to FIG. 10, there is shown a third embodiment of the invention wherein a
tube 90 is inserted into a fitting 92 having a crimpingcollar 93. Thetube 90 has anecked down portion 94 joined thereto by a frusto-conical section or tapered 95. The frusto-conical section 95 joins anintermediate section 96 just in front of abead 97. The fitting 92 has asmooth bore 100 that has anabutment surface 101 defined by anannular shoulder 102 therein that is disposed within in anannular recess 104. As with the embodiment of FIGS. 5-9, thetube 90 is shoved into the fitting 92 (as shown in FIG. 6C) until thebead 97 abuts theshoulder 102 of theabutment surface 101. Anannular portion 106 of the wall of therecess 104 is then deformed by staking theportion 106 against thebead 97 to retain thetube 90 within thebore 100 of the fitting 92. Thereafter, aportion 110 of a secondannular recess 112 within the fitting proximate the crimpingcollar 93 is deformed against the taperedsection 95 of thetube 90 to provide a taperedportion 113 of thebore 100 against which the tapered portion of the tube seats. This seals thetube 90 within the fitting 92 at substantially three locations, whereafter thehose 23 is secured within the fitting 92 by deforming the crimpingcollar 93. The arrangement of the second embodiment of the invention shown in FIG. 10 is used substantially as the arrangement of the first embodiment shown in FIGS. 5-9. As with the embodiments of FIGS. 5-8 and 9, the embodiment of FIG. 10 is used in situations such as that of FIG. 1 where aflexible hose 23 connects a source of hydraulic fluid to atube 20, which tube retains fluid which operates a hydraulic device, such as the calipers of a brake, or a clutch, or any other device requiring high pressure hydraulic fluid delivered via a flexible hose. - Referring now to FIGS. 11 and 12A-D, there is shown a fourth embodiment of the invention wherein a
metal tube 200 is coupled to thehose 23 by a fitting 202 to form acoupling 203. Themetal tube 200 has a drawn downportion 204 which has a relatively small outside diameter d1 which is less than the outside diameter d2 of a main portion 205 of the tube. In addition, thetube 200 has anannular bead 206 having a firstaxially facing surface 208 and a secondaxially facing surface 210.Tube 200 is received through asmooth bore 212 in abody portion 213 of the fitting 202 and, if the metal tube does not have a plastic coating, may have an interference fit.Tube 200 is retained within the fitting 202 by abutment between thefirst surface 208 of thebead 206 with ashoulder 216 adjacent thebore 212 and by a swaged, staked orannular portion 218 of the fitting 202 that forms a second abutment which engages thesurface 210 of the bead. The fitting 202 andtube 200 are therefore prevented from any axial or rotational movement, one with respect to the other while also being provided with metal-to-metal fluid seals 219 and 216 which prevent entry of moisture and corrosive agents that might degrade the interior of the coupling. - Preferably, the main portion205 of the
metal tube 200 is coated or covered with alayer 220 of a plastic material such as, for example, a polyamide, i.e., NYLON®, which layer of plastic material terminates before or at thebead 206 leaving the bead uncoated for the metal-to-metal seal 219 with the fitting as well as leaving thesmall diameter portion 204 uncoated for ready receipt in the bore of thehose 23. Examples of other plastic materials which may be used are polyvinylfluoride or polypropylene. - A preferred example of a tube configuration for the
tube 200 comprises a base tube of SAE 1008/1010 mild steel with a layer of copper plating over which is a 10-15μm 95% zinc/5% aluminum hot dip coating. The layer ofplastic material 220 is preferably a layer of polyamide over a binder layer which is on average about 3.5 μm thick. - Referring now to FIGS.12A-12D, preferred steps in assembling the
coupling 203 are shown in sequence. As is seen in FIG. 12A,tube 200 is provided.Tube 200 is drawn to provide thesmall diameter portion 204 and to form frusto-conical portion 222 which joins the small diameter portion 201 to the remainder of thetube 200. As is seen in FIG. 12B, the tube is deformed by pressing axially against the tube so that it bulges outwardly to form thebubble 206 generally in the location of the frusto-conical portion 222. If theentire tube 200 has previously been coated with aplastic layer 220, the plastic layer is stripped from theinsertion portion 204 and thebead 206 prior to drawing. - There are a number of methods to remove a portion of the
plastic layer 220 from a portion of thetube 200. These methods include applying mechanical cutting tools, abrasive wheels or brushes or using laser ablation, chemical solvents or water jet ablation. Thetube 200 may be axially moved and rotated as the plastic and other non-metallic materials are stripped therefrom preferably prior to drawing or otherwise deforming thetube 200. - Referring now to FIG. 12C, the fitting202 is slid along the length of the
tube 200 from its opposite end or, in the alternative, the tube is simply inserted into thebore 212 until thesurface 208 on thebead 206 is abutted by theshoulder 216 that is adjacent the end of the bore. Preferably, the fit between thetube 200 and thebore 212 is a sliding fit with theplastic layer 220 sliding within the bore. The fit between thetube 200 and bore may be sufficiently tight to form a fluid tight seal. As is seen in FIG. 16D, theannular portion 218 of the wide portion of thebore 212 is then swaged or staked against thesecond face 210 of thebead 206 in order to form thecoupling 203 which firmly retains thetube 200 within the fitting 202 and forms the metal-to-metal, fluidtight seal 219 therewith. - After the
coupling 203 is formed, the hose 23 (FIG. 11) is inserted into ahollow portion 230 of the fitting 202 which forms a crimping collar that is unitary with thebody portion 213 of the fitting. The crimpingcollar 230 is then deformed radially inwardly to retain thehose 23 permanently and non-rotatably in communication with thetube 200. - By utilizing the arrangement of the present invention, tubes are retained within fittings, such as fittings for joining the tubes to hoses, utilizing mechanical steps which involve neither rotating the tube with respect to the fitting, brazing the tube to the fitting or using a retaining unit.
- From the foregoing description, one skilled in the art can easily ascertain the essential characteristics of this invention, and without departing from the spirit and scope thereof, can make various changes and modification of the invention to adapt it to various usages and conditions.
Claims (19)
1. A coupling for connecting a tube to a hose comprising:
a tube having a main portion and an insertion portion;
at least one outwardly extending radial projection on the tube, with the insertion portion of the tube extending beyond the radial projection;
a fitting having a body portion with a bore for receiving the tube therethrough and a hollow portion extending from the first portion for receiving the hose therein;
an inside radial surface on the body portion facing toward the hollow portion; and
the tube being disposed in the bore of the body portion with the outwardly extending radial projection abutting the inside radial surface on the body portion and the insertion portion extending into the hollow portion of the fitting for receipt in the hose.
2. The coupling of claim 1 , wherein the body portion of the fitting includes an abutment surface thereon facing away from the hollow portion and engaging a portion of the tube.
3. The coupling of claim 2 , wherein the portion of the tube engaged by the abutment surface is on said one outwardly extending radial projection.
4. The coupling of claim 3 , wherein the abutment surface is on a portion of the fitting which is radially and axially deformed into abutment with said one outwardly extending radial fitting.
5. The coupling of claim 2 , wherein there is a second outwardly extending radial projection on the tube, spaced axially from said one outwardly extending radial projection, and wherein the abutment surface on the fitting engages the second outwardly extending radial projection on the tube.
6. The coupling of claim 5 , wherein the second axially extending abutment is at a radially extending end of the fitting.
7. The coupling of claim 6 , wherein the insertion portion has a diameter less than that of the main portion of the tube.
8. The coupling of claim 7 , wherein the hollow portion of the fitting is a crimping collar for radially engaging the hose with the insertion portion of the tube within the hose.
9. The coupling of claim 1 , wherein the inside radial surface facing the hollow portion is a flat surface engaged by the radial projection and wherein there is an outside radial surface facing away from the hollow portion and defining another flat surface which is engaged by another radial projection on the tube.
10. A coupling for connecting a tube to a hose comprising:
a metal tube having a main portion and an insertion portion, the insertion portion having an outer diameter corresponding to the inner diameter of the hose for insertion therein and a controlled inner diameter;
a radial projection on the metal tube adjacent the insertion portion, the radial projection having oppositely facing surfaces;
a layer of plastic material covering the main portion of the tube and terminating at the radial projection, the radial projection being free of plastic material;
a fitting having a bore therein slidably receiving the main portion of the metal tube, the fitting including an abutment surface extending radially of the bore and including an annular recess in which the radial projection on the tube seats, the abutment surface being within a crimping collar that is unitary with the fitting; and
an annular deformed portion adjacent the annular recess, which annular deformed portion is deformed into abutment with the radial projection to form a metal-to-metal fluid tight seal which also fixes the metal tube to the fitting.
11. The coupling of claim 10 , wherein the metal tube has an outer diameter which is larger than the outer diameter of the insertion portion.
12. The coupling of claim 11 , wherein the fitting has a unitary hollow portion which extends beyond the abutment surface and surrounds the insertion portion of the metal tube wherein the hollow portion receives the hose.
13. The coupling of claim 11 , wherein the unitary hollow portion receives the hose therein and wherein the hollow portion is crimped against the hose with the insertion portion of the tube received within the hose.
14. The coupling arrangement of claim 13 , wherein the hollow portion is coaxial with both the main portion and insertion portion of the metal tube.
15. The coupling of claim 13 , wherein the tube, hose and fitting are components of a hydraulic or other automotive fluids as required and are adapted to be filled with hydraulic fluid.
16. The coupling of claim 10 , wherein the layer of plastic material is in a sealing relationship with the bore of the fitting.
17. The coupling arrangement of claim 16 , wherein the layer of plastic material is selected from the group consisting of polyamide, polyvinylfluoride and polypropylene.
18. The coupling arrangement of claim 12 , wherein the metal tube has a tapered section joining the insertion portion to the main portion and wherein the bore has a corresponding tapered portion against which the tapered portion of the metal tube seats.
19. The coupling arrangement of claim 18 , wherein the abutment surface of the fitting is disposed adjacent the metal tube within the fitting when the annular deformed portion is deformed against the radial projection and the main portion of the tube extends away from the fitting and wherein the tapered portion of the fitting is positioned adjacent a crimping collar that is unitary with the fitting so that the insertion portion of the metal tube extends within the crimping collar for receiving and clamping the hose therein with the insertion portion in the hose.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/103,615 US20020096877A1 (en) | 1998-03-24 | 2002-03-21 | High-pressure integral tube coupling arrangements |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US7915298P | 1998-03-24 | 1998-03-24 | |
US10163098P | 1998-09-24 | 1998-09-24 | |
US09/646,706 US6447020B1 (en) | 1998-03-24 | 1999-03-24 | High-pressure integral tube coupling arrangements |
US10/103,615 US20020096877A1 (en) | 1998-03-24 | 2002-03-21 | High-pressure integral tube coupling arrangements |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/646,706 Continuation US6447020B1 (en) | 1998-03-24 | 1999-03-24 | High-pressure integral tube coupling arrangements |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020096877A1 true US20020096877A1 (en) | 2002-07-25 |
Family
ID=26761669
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/646,706 Expired - Lifetime US6447020B1 (en) | 1998-03-24 | 1999-03-24 | High-pressure integral tube coupling arrangements |
US10/103,615 Abandoned US20020096877A1 (en) | 1998-03-24 | 2002-03-21 | High-pressure integral tube coupling arrangements |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/646,706 Expired - Lifetime US6447020B1 (en) | 1998-03-24 | 1999-03-24 | High-pressure integral tube coupling arrangements |
Country Status (5)
Country | Link |
---|---|
US (2) | US6447020B1 (en) |
EP (1) | EP1071902A4 (en) |
AU (1) | AU3200499A (en) |
BR (1) | BR9909025A (en) |
WO (1) | WO1999049256A1 (en) |
Cited By (5)
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US20080213709A1 (en) * | 2005-11-18 | 2008-09-04 | Russell Clayton | Gas supply coupling for a water heater |
US20090302603A1 (en) * | 2005-11-18 | 2009-12-10 | Russell Clayton | Gas supply coupling for a water heater |
US20100140926A1 (en) * | 2008-11-20 | 2010-06-10 | Jonathan Clark Swift | Crimpable or swageable fluid power ferrules, couplings, systems and methods employing torque communication |
CN106476787A (en) * | 2015-09-02 | 2017-03-08 | 大进合紧固件(昆山)有限公司 | Hydraulic pipeline connecting component for hydraulic braking system for automobile |
JP7404611B2 (en) | 2019-12-19 | 2023-12-26 | メルセデス・ベンツ グループ アクチェンゲゼルシャフト | Vehicle braking device |
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AU2001217373A1 (en) * | 2000-11-30 | 2002-06-11 | Tebo, S.A. De C.V. | Tube insert for hoses of hydraulic or pneumatic systems |
US20020092719A1 (en) * | 2001-01-12 | 2002-07-18 | Harco Industries, Inc. | Flexible hydraulic brake line assembly for motor vehicle wheels |
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US7537245B2 (en) * | 2005-02-14 | 2009-05-26 | Medtronic, Inc. | Strain relief device and connector assemblies incorporating same |
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FR2972699A1 (en) * | 2011-03-15 | 2012-09-21 | Peugeot Citroen Automobiles Sa | Braking device for car, has removable insert forming sealed connection between connector of brake caliper and connector of pressurized fluid supplying circuit to allow fluid supplying circuit to supply pressurized fluid to brake caliper |
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- 1999-03-24 BR BR9909025-2A patent/BR9909025A/en active Search and Examination
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080213709A1 (en) * | 2005-11-18 | 2008-09-04 | Russell Clayton | Gas supply coupling for a water heater |
US20090302603A1 (en) * | 2005-11-18 | 2009-12-10 | Russell Clayton | Gas supply coupling for a water heater |
US20100140926A1 (en) * | 2008-11-20 | 2010-06-10 | Jonathan Clark Swift | Crimpable or swageable fluid power ferrules, couplings, systems and methods employing torque communication |
US9857008B2 (en) * | 2008-11-20 | 2018-01-02 | Gates Corporation | Crimpable or swageable fluid power ferrules, couplings, systems and methods employing torque communication |
CN106476787A (en) * | 2015-09-02 | 2017-03-08 | 大进合紧固件(昆山)有限公司 | Hydraulic pipeline connecting component for hydraulic braking system for automobile |
JP7404611B2 (en) | 2019-12-19 | 2023-12-26 | メルセデス・ベンツ グループ アクチェンゲゼルシャフト | Vehicle braking device |
Also Published As
Publication number | Publication date |
---|---|
WO1999049256A1 (en) | 1999-09-30 |
BR9909025A (en) | 2000-12-05 |
US6447020B1 (en) | 2002-09-10 |
AU3200499A (en) | 1999-10-18 |
EP1071902A1 (en) | 2001-01-31 |
EP1071902A4 (en) | 2006-05-10 |
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Legal Events
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |