EP2428289B1 - Verfahren zur Herstellung von Rohrhülsen für Trampoline - Google Patents

Verfahren zur Herstellung von Rohrhülsen für Trampoline Download PDF

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Publication number
EP2428289B1
EP2428289B1 EP20100175829 EP10175829A EP2428289B1 EP 2428289 B1 EP2428289 B1 EP 2428289B1 EP 20100175829 EP20100175829 EP 20100175829 EP 10175829 A EP10175829 A EP 10175829A EP 2428289 B1 EP2428289 B1 EP 2428289B1
Authority
EP
European Patent Office
Prior art keywords
sleeve
coupling
expanded
seam
lateral edge
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.)
Not-in-force
Application number
EP20100175829
Other languages
English (en)
French (fr)
Other versions
EP2428289A1 (de
Inventor
Hua-Lu Hsiang
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.)
Crowntec Fitness Mfg Ltd
Original Assignee
Crowntec Fitness Mfg Ltd
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 Crowntec Fitness Mfg Ltd filed Critical Crowntec Fitness Mfg Ltd
Priority to EP20100175829 priority Critical patent/EP2428289B1/de
Publication of EP2428289A1 publication Critical patent/EP2428289A1/de
Application granted granted Critical
Publication of EP2428289B1 publication Critical patent/EP2428289B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/28—Making tube fittings for connecting pipes, e.g. U-pieces
    • B21C37/286—Making tube fittings for connecting pipes, e.g. U-pieces starting from sheet material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/08—Making tubes with welded or soldered seams
    • B21C37/0815—Making tubes with welded or soldered seams without continuous longitudinal movement of the sheet during the bending operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/155—Making tubes with non circular section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
    • B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
    • B21C37/06—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
    • B21C37/15—Making tubes of special shape; Making tube fittings
    • B21C37/16—Making tubes with varying diameter in longitudinal direction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D17/00—Forming single grooves in sheet metal or tubular or hollow articles
    • B21D17/02—Forming single grooves in sheet metal or tubular or hollow articles by pressing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/02—Enlarging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D41/00—Application of procedures in order to alter the diameter of tube ends
    • B21D41/04—Reducing; Closing

Definitions

  • the present invention relates to a fabrication method and particularly to a fabrication method capable of detecting fabrication defects of sleeves for trampolines.
  • Trampoline is a jumping sport equipment allowing users to jump in the air to perform various movements to do exercise on leg muscles, enhance bouncing capability and improve coordination. Besides used on general sport activities, it is also frequently used in circus or acrobatics to allow performers to do special movements in the air to entertain audiences.
  • U.S. patent Nos. 2004/0176214 , 2006/0172861 and 2007/0012902 disclose trampolines that include a frame to hold a jumping net.
  • the frame consists of a plurality of tubes coupling together in a compact manner.
  • the tubes usually are fabricated by machining a tube close to an opening in a conical shape at a reduced outer diameter or in a cylindrical shape at an outer diameter smaller than the tube so that mutual coupling can be accomplished between them.
  • the tube generally is made of metal and can be formed integrally such as by casting, injection or machining. It also can be fabricated from a metal plate by forming and bonding.
  • the tube made integrally generally is more expensive, but is cheaper if fabricated from the metal plate, thus the metal plate is commonly adopted to reduce production cost.
  • FIG. 1 for a conventional trampoline with a frame comprising a plurality of first tubes 1 and second tubes 2 coupled together.
  • FIGS. 2A and 2B for coupling of the first tube 1 and second tube 2 of the conventional frame of a trampoline.
  • the first tube 1 and second tube 2 are fabricated by soldering with a solder seam 3 and 4 formed respectively thereon to be coupled with each other.
  • the second tube 2 also has a coupling portion 5 at one end formed by machining. During assembly, the coupling portion 5 is inserted into the opening of the first tube 1 and a pressure is applied on the opening to form a compact coupling between the first and second tubes 1 and 2.
  • the solder seams 3 and 4 have a vertical coupling interface that generates a tensile stress and a compressive stress in the compact coupling condition.
  • the tensile stress that the coupling interface generally can bear is much smaller than the compressive stress, hence damage usually takes place on the first tube 1.
  • the coupling interface of the solder seam 3 affects the coupling quality between the first tube 1 and second tube 2.
  • the solder seam 3 has to be inspected whether obvious detects are formed before the first tube 1 and second tube 2 are coupled with each other to avert defective coupling between the first tube 1 and second tube 2.
  • the conventional inspection method is aided by incorporating with inspection equipment to project light on the solder seam 3. By observing through the light penetration, a defect can be identified.
  • such a method cannot be applied to mass production if a great number of tubes have to be inspected and significantly reduces assembly efficiency of the trampoline. As a result, production cost is higher.
  • WO 02/02255 JP 200 271743 , US 1791 887 , WO 2005/ 061148 , DDE 21 10 758 , JP 57 152327A disclose general principles of the manufacturing of sleeves for a tube connection.
  • the primary object of the present invention is to solve the problem of tube inspection of the conventional trampoline that requires extra equipment to determine coupling quality.
  • the present invention provides a method of fabricating sleeves for trampolines that forms a frame of a trampoline.
  • the method includes the steps as follow:
  • the method of fabricating sleeves for trampolines according to the invention includes the steps as follow:
  • a fabrication process and machine such as a plate folding machine, punch, plate bending machine or the like to form the plate 10 in a circular sleeve 20 shape that has a coupling seam 21 formed between the first lateral edge 11 and second lateral edge 12
  • bond the first lateral edge 11 and second lateral edge 12 to form the sleeve 20 through a bonding process such as soldering, brazing, arc
  • the sleeve 20 has an opening 22 to be expanded to make the sleeve 20 include a body 23 and an expanded opening section 24 extended from the body 23.
  • the expanded opening section 24 is formed at a diameter greater than that of the body 23. Expanding the opening can be accomplished by a punching process through a punch or an opening expanding machine. In this embodiment, the diameter of the expanded opening section 24 gradually expands along the axial direction of the sleeve 20. According to the fabrication equipment, the expanded opening section 24 may be formed in a cylindrical or conical shape.
  • a compressive force is applied to the expanded opening section 24 to make the expanded opening section 24 to form an outer expanded portion 241 and an inner folding portion 242 shown in FIG. 5B .
  • the outer expanded portion 241 is connected to the body 23 while the inner folding portion 242 is bent towards the interior of the sleeve 20 so that the inner wall of the sleeve 20 forms an annular groove.
  • the inner folding portion 242 is formed at an inner diameter smaller than the outer diameter of the outer expanded portion 241.
  • the diameter of the inner folding portion 242 is gradually shrunk along the axial direction of the sleeve 20.
  • the opening expansion means and compressive force applying process can be performed on the same punch.
  • the sleeve 20 of the invention can be formed in varying profiles.
  • FIG. 6 shows an embodiment of the sleeve 20 formed in a circular shape.
  • FIG. 7 shows another embodiment of the sleeve 20 containing an upper plane and a lower plane in parallel, and left and right arched surfaces interposed between the upper and lower planes. Such a tubular structure can withstand greater compressive strength.
  • the sleeve 20 may also be formed in a square shape as shown in FIG. 8 .
  • the coupling state of the coupling seam 21 in the outer expanded portion 241 and inner folding portion 242 can be inspected visually to determine whether the first lateral edge 11 and second lateral edge 12 are tightly bonded, and defects of the coupling seam 21 can also be detected visually through naked eyes, or through an image capturing device by capturing the image of the coupling seam 21, then operators can determine whether defects existed on the coupling seam 21 by examining the image. In practice, if no defect is seen on the coupling seam 21, the sleeve 20 can be judged acceptable for assembly in the following process as shown in FIG. 9 showing the sleeve and a connection tube in a coupled condition.
  • a defect 25 is formed on the coupling seam 21 in the outer expanded portion 241 and inner folding portion 242, the sleeve 20 is judged unacceptable and has to be discarded or the bonding process of the sleeve 20 has to be performed anew.
  • connection tube 30 is fabricated through a process similar to the sleeve 20.
  • the connection tube 30 also has a coupling seam 31, a body 32 and a coupling section 33 extended from the body 32.
  • the coupling section 33 is formed at a diameter smaller than the body 32.
  • the sleeve 20 and connection tube 30 can be coupled in a compact manner.
  • the structure formed by the outer expanded portion 241 and inner folding portion 242 can prevent damage of the coupling seam 21 when the sleeve 20 and connection tube 30 are collided with each or receive direct external impact.
  • the connection tube 30 may select a tube at a diameter between the outer and inner diameters of the body 23 without forming the coupling section 33 by fabrication.
  • the method of fabricating sleeves for trampolines of the invention mainly aims to expand the opening of the sleeve and bend the opening before assembly of the sleeve and connection tube.
  • Defects on the coupling seam can grow to a size visible by naked eyes.
  • operators can easily and visually detect defected products or acceptable products.
  • workers can instantly identify defected products through a simple fabrication process without sending the sleeves to other inspection equipment to do inspection before conveying to the following process.
  • assembly time of the trampoline can be reduced and production cost also is lower, and productivity can be enhanced.
  • the outer expanded portion and inner folding portion also increase the structural strength after the sleeve and connection tube are coupled together.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)

Claims (10)

  1. Ein Verfahren, um Muffen für Trampoline herzustellen, wobei jedes eine Anzahl an Muffen umfasst, die verbunden sind, um das Gerüst des Trampolins zu bilden, umfasst die Schritte:
    Biegen einer Platte (10), welche eine erste Seitenkante (11) und eine zweite Seitenkante (12) umfasst, die einander gegenüber stehen, um ein Verbindungsnaht (21) zu bilden, die durch einen Verbindungsprozess verbunden wird, um eine Muffe (20) zu bilden;
    Erweitern einer Öffnung (22) der Muffe (20) durch ein Öffnungs- Erweiterungs-Mittel, sodass die Muffe (20) ein Gehäuse (23) und einen erweiterten Öffnungsabschnitt (24), der sich vom Gehäuse (23) erstreckt, umfasst und mit einem Umfang, der größer ist als das Gehäuse ist, gebildet wird,
    Biegen der Muffe (20) durch Anwenden einer Druckkraft auf die erweiterte Öffnung (24) um einen äußeren, erweiterten Abschnitt zu bilden (241), der mit dem Gehäuse (23) und einem inneren Faltabschnitt (242) verbunden ist, der zu dem Inneren der Muffe (20) gebogen ist, so dass die innere Wand der Muffe (20) eine ringförmige Kerbe bildet, und
    visuelles Inspizieren des Verbindungszustandes der Verbindungs-Naht (21) in dem äußeren erweiterten Abschnitt (241) und dem inneren Faltabschnittes (242), um festzustellen, ob die erste Seitenkante (11) und die zweite Seitenkante (12) fest verbunden sind.
  2. Das Verfahren nach Anspruch 1, wobei die Öffuungserweiterung mittels eines Schlagverfahrens durchgeführt wird, um den erweiterten Öffnungsabschnitt (24) zu bilden.
  3. Das Verfahren nach Anspruch 1, wobei der Durchmesser des erweiterten Öffnungsabschnittes (24) sich graduell in Axialrichtung der Muffe (20) vergrößert.
  4. Das Verfahren nach Anspruch 1, wobei der innere Faltabschnitt (242) in einem Durchmesser ausgebildet ist, der graduell in der Axialrichtung der Muffe (20) kleiner wird.
  5. Das Verfahren nach Anspruch 1, wobei der innere Faltabschnitt in einem inneren Durchmesser ausgebildet ist, der kleiner ist als der äußere Durchmesser des äußeren erweiterten Abschnittes (241).
  6. Das Verfahren nach Anspruch 1, wobei durch ein visuelles Inspizieren der Verbindungsnaht (21) durch das bloße Auge festzustellen ist, ob ein Defekt an der Verbindungs-Naht (21) vorliegt.
  7. Das Verfahren nach Anspruch 1, wobei das visuelle Inspizieren der Verbindungsnaht (21) durchgeführt wird, indem ein Bild der Verbindungsnaht (21) mit fotographischer Ausrüstung gemacht wird, um festzustellen, ob Defekte an der Verbindungsnaht (21) existieren.
  8. Das Verfahren nach Anspruch 1, wobei eine Muffe (20) in einer runden Form gebildet wird.
  9. Das Verfahren nach Anspruch 1, wobei eine Muffe (20) in einer quadratischen Form gebildet wird.
  10. Das Verfahren nach Anspruch 1, wobei die Muffe (20) in einer rohrförmigen Struktur gebildet wird, die eine obere Ebene und eine untere Ebene die parallel zueinander stehen und eine linke gewölbte Oberfläche und eine rechte gewölbten Oberfläche zwischen der oberen und zwischengeschaltet niederen Ebenen, umfassen.
EP20100175829 2010-09-08 2010-09-08 Verfahren zur Herstellung von Rohrhülsen für Trampoline Not-in-force EP2428289B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20100175829 EP2428289B1 (de) 2010-09-08 2010-09-08 Verfahren zur Herstellung von Rohrhülsen für Trampoline

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20100175829 EP2428289B1 (de) 2010-09-08 2010-09-08 Verfahren zur Herstellung von Rohrhülsen für Trampoline

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EP2428289A1 EP2428289A1 (de) 2012-03-14
EP2428289B1 true EP2428289B1 (de) 2013-04-03

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Application Number Title Priority Date Filing Date
EP20100175829 Not-in-force EP2428289B1 (de) 2010-09-08 2010-09-08 Verfahren zur Herstellung von Rohrhülsen für Trampoline

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015110998B4 (de) * 2015-07-08 2023-03-02 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Verfahren zur Herstellung einer Endrohrblende oder eines Rohrelements und Vorrichtung zur Herstellung der Endrohrblende oder des Rohrelements

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1791887A (en) * 1929-06-01 1931-02-10 Nat Tube Co Apparatus for expanding pipe ends
DE2110758A1 (de) * 1971-03-06 1972-09-21 Pilag Engineering Ltd Verfahren zur Herstellung einer Kupplungshuelse
JPS57152327A (en) * 1981-03-17 1982-09-20 Sanwa Shutter Corp Joining method for square cylindrical tube
JP2000271743A (ja) * 1999-03-26 2000-10-03 Hitachi Metals Ltd 溶接部検査方法並びに検査装置及び配管用溶接管
DE10031989B4 (de) * 2000-06-30 2007-08-16 Witzig & Frank Gmbh Verfahren und Vorrichtung zur Herstellung von Pressfittings aus Stahl, insbesondere Edelstahl
US20040176214A1 (en) 2003-02-25 2004-09-09 Shen-Tai Industry Co., Ltd. Connector for trampoline safety fence post
WO2005061148A1 (de) * 2003-11-28 2005-07-07 Witzig & Frank Gmbh Verfahren zur herstellung einer muffe an einem rohr und vorrichtung zur herstellung dieser muffe
US20060172861A1 (en) 2005-01-28 2006-08-03 Shen-Tai Industry Co., Ltd. Small-size trampoline
CN2803443Y (zh) 2005-07-14 2006-08-09 莫志平 跳床安全围篱护杆联结装置

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Publication number Publication date
EP2428289A1 (de) 2012-03-14

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