EP1440897B1 - Fabrication process for crimpable metallic crossbar terminals for flexible handles - Google Patents
Fabrication process for crimpable metallic crossbar terminals for flexible handles Download PDFInfo
- Publication number
- EP1440897B1 EP1440897B1 EP03425030A EP03425030A EP1440897B1 EP 1440897 B1 EP1440897 B1 EP 1440897B1 EP 03425030 A EP03425030 A EP 03425030A EP 03425030 A EP03425030 A EP 03425030A EP 1440897 B1 EP1440897 B1 EP 1440897B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- die
- tub
- sheet metal
- oblong
- station
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Images
Classifications
-
- 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
- B21D53/00—Making other particular articles
- B21D53/58—Making other particular articles end-pieces for laces or ropes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D33/00—Details of, or accessories for, sacks or bags
- B65D33/06—Handles
- B65D33/12—String handles
Definitions
- This invention generally concerns paper trade and bookbinding materials and articles and more specifically reinforced paper or plastic bags provided with flexible fabric or plastic handles, commonly of flexible cord, constituted for instance of sections of cord or plastic tubing whose extremities are provided with a crimpable crossbar terminal and respectively insertable through a pair of holes near the hem of the bag, by rotating the crossbar terminal in line with the cord and then releasing it to spread out from the cord once passing the hole, as needed to prevent it from slipping out.
- flexible fabric or plastic handles commonly of flexible cord, constituted for instance of sections of cord or plastic tubing whose extremities are provided with a crimpable crossbar terminal and respectively insertable through a pair of holes near the hem of the bag, by rotating the crossbar terminal in line with the cord and then releasing it to spread out from the cord once passing the hole, as needed to prevent it from slipping out.
- the crossbar terminals are commonly made of die-punched sheet metal, the sheet metal being suitable for readily and permanently crimping the handle cord or tubing.
- the shape of the crossbar terminal thus obtained by die-punching is that of an elongated flat body with two lateral wings that are eventually bent perpendicular to the flat body of an elongated form.
- the joining or crimping of the crossbar terminal on the cord or other fabric suitable for handles occurs by folding the two wings over the handle's fabric material placed over the elongated body.
- crossbar terminals of this type While functionally effective, the crossbar terminals of this type have particularly undesirable drawbacks owing to their use in carrying bags to be filled with purchased articles, often items of apparel, footwear or the like.
- crossbar terminals of die-punched sheet metal retain relatively sharp cut edges, that may accidentally damage objects being inserted or extracted from the carrying bag, or scratch the hands.
- EP-1 166 672-A1 discloses an end ferrule in the form of a semi-cylindrical body with rounded edges in the form of a 1/4 of a hollow sphere and two flaps that may be folded to crimp the end of the cord inside the semi-cylindrical body.
- the convexity of the ferrule effectively prevents accidental contacts with the sharp edges of the ferrule.
- the drawing action is performed in a tub shaped mold using a corresponding pressing countermold and simultaneously also causes the bending of the two wings defined along the opposite sides of the flat die-stamped elongated body, thus preparing them to be eventually folded to crimp the fabric or plastic strip or cord, which is eventually pressed into the concavity of the tub formed elongated body.
- the crimped crossbar terminal is pulled back in abutment with the inner surface of the hem of the bag by the weight of the bag suspended from the two flexible handles, as is disposes itself substantially cross-wire to the insertion hole of the bag hem.
- the crossbar terminal thus offers its convex face to contact with the hands or the objects being introduced or extracted from the bag, preventing in practice any possibility of contact with the cut edges of the die-stamped sheet metal and of the severed sacrificial metal bridging portions, all laying in the plane of the face that is pulled against the inner surface of the (commonly reinforced) hem of the bag.
- the crossbar terminals of this invention may be fabricated in the form of a continuous article of manufacture constituted by a chain of crossbar terminals defined by die-stamping and subsequently drawn in a mold, by retaining intact, even during the drawing step, the severable connecting metal bridges between juxtaposed extremities of the crossbar terminals adjacently formed along the sheet metal strip.
- the continuous chain of formed crossbar terminals may be incrementally fed by normal automation techniques to the automatic machine that performs the crimping of the crossbar terminals on fabric or plastic handles, by folding the side wings to crimp the handle material pressed inside the oblong cavity of the tub formed crossbar terminal.
- the Figure 1 shows crossbar terminals being fabricated according to this invention in the form of a continuous chain of crossbar terminals 1, joined by severable bridges 2, from a strip 3 of sheet metal.
- the strip 3 is generally made of a thin sheet of mild steel, tinned or otherwise treated or coated to resist oxidation, although other relatively ductile alloys may also be used.
- the thickness and width of the strip 3 are commensurate with the dimensions and mechanical properties desired for the crossbar terminals to be produced.
- the thickness may generally be comprised between 0.2 and 0.5 mm, and the width between 7 and 16 mm.
- flat bodies 1p of an elongated or oblong shape and having two lateral wings 4 and 5 are formed by die-punching.
- the flat bodies are stamped in sequence by incrementally advancing the feed strip 3 through the die-punching station, and remain attached to each other by narrow severable bridges 2, defined by the cutting perimeter of the die to connect the juxtaposed ends of two consecutively stamped bodies along he strip.
- the flat bodies 1p defined by die-punching are drawn in a tub shaped mold by pressing the sheet metal with a countermold or dolly. While drawing the crossbar terminal oblong body 1, the two lateral wings 4 and 5 orient themselves perpendicularly to the oblong or elongated body being drawn inside the mold.
- the Figure 2 is a simplified view of an alternative embodiment of the two step process of fabrication of a chain of a crossbar terminals.
- the drawing station after the die-stamping station thus contemplating the drawing of each flat body 1p that incrementally reach it, by pressing each flat body between a tub shaped mold and its dolly, causing a plastic deformation of the ductile sheet metal according to a sequential forming of each die-stamped body that reach the station as depicted in Figure 1, the machine may alternatively be provided with two or even more drawing stations, identically equipped, after the first die-punching station.
- the drawing may not be performed on each die-punched body reaching the drawing station immediately following the die-punching station in the direction of advancement of the feed metal strip, but alternatively on either the odd or even numbered bodies, while in the following drawing station the drawing is performed on the even or odd numbered flat bodies that were not drawn upon passing through the first station.
- the manufactured article that is produced according to the sequential drawing scheme of Figure 2 will turn out to be essentially equivalent to the manufactured article produced according to the sequential drawing scheme of Figure 1.
- An advantage of employing two or more drawing stations consists in providing for an enhanced freedom of plastic flowing of the sheet metal (induced by the drawing action), by permitting to a longer segment of the metal chain to contribute to the plastic flow of the metal in a longitudinal direction, thus limiting the concentration of strain in the bridging portions 2 that could lead to premature raptures.
- Figure 3 shows a crossbar terminal according to this invention fully formed and ready to receive the cord or flexible textile or plastic strip to be crimped thereupon, by folding the two lateral wings inside the concavity in the form of an oblong tub of the drawn body I of the crossbar terminal.
- Figure 4 shows an article of manufacture consisting of a chain of crossbar terminals made in the process of the invention wound on a feed reel of a handle-fabricating machine.
- Figure 5 shows a textile handle, with metallic crossbar terminals 1 made according to this invention, crimped thereto, at the two extremities of a textile cord 6.
- Figure 6 shows the way in which the handle is applied to the bag by passing each end of the cord 6, provided with the relative crossbar terminal 1, through a hole 7 present near the hem.
- Figure 7 shows a bag equipped with textile handles provided with crossbar terminals.
- the flexible handles may even be made with a fabric stripe or with a flexible plastic tubing.
- the sheet metal crossbar terminals fabricated according to the process of this invention may even be used in document folders, applied to the extremities of elastic cords that can be stretched and passed over foldable wings of the folder to prevent documents to slip out.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Manufacturing Of Electrical Connectors (AREA)
- Adornments (AREA)
- Multi-Conductor Connections (AREA)
- Package Frames And Binding Bands (AREA)
- Purses, Travelling Bags, Baskets, Or Suitcases (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
Description
- This invention generally concerns paper trade and bookbinding materials and articles and more specifically reinforced paper or plastic bags provided with flexible fabric or plastic handles, commonly of flexible cord, constituted for instance of sections of cord or plastic tubing whose extremities are provided with a crimpable crossbar terminal and respectively insertable through a pair of holes near the hem of the bag, by rotating the crossbar terminal in line with the cord and then releasing it to spread out from the cord once passing the hole, as needed to prevent it from slipping out.
- For these uses, the crossbar terminals are commonly made of die-punched sheet metal, the sheet metal being suitable for readily and permanently crimping the handle cord or tubing.
- The shape of the crossbar terminal thus obtained by die-punching is that of an elongated flat body with two lateral wings that are eventually bent perpendicular to the flat body of an elongated form. The joining or crimping of the crossbar terminal on the cord or other fabric suitable for handles occurs by folding the two wings over the handle's fabric material placed over the elongated body.
- Normally, even this operation of applying crossbar terminals to the cord or fabric or equivalent plastic material is carried out by automatic machines, fed with the fabric strip or cord and with a continuous article of manufacture of die-punched crossbar terminals with wings bent at right angles to the elongated body, joined by severable metal bridging portions defmed by the die-punching tools, in order to keep together the crossbar terminals sequentially die-punched along a continuous strip of sheet metal incrementally fed to the punching machine.
- While functionally effective, the crossbar terminals of this type have particularly undesirable drawbacks owing to their use in carrying bags to be filled with purchased articles, often items of apparel, footwear or the like.
- The crossbar terminals of die-punched sheet metal retain relatively sharp cut edges, that may accidentally damage objects being inserted or extracted from the carrying bag, or scratch the hands.
- "Hiding" the crossbar terminals in purposely created pockets or applying adhesives to cover them are expensive and/or time taking operations at any rate poorly effective solutions.
- Moreover, malfunctionings are not infrequent due to a slipping out of the extremity of the handle cord or fabric strip from the crossbar terminal if subjected to just a slightly higher traction than normal.
- EP-1 166 672-A1 discloses an end ferrule in the form of a semi-cylindrical body with rounded edges in the form of a 1/4 of a hollow sphere and two flaps that may be folded to crimp the end of the cord inside the semi-cylindrical body. The convexity of the ferrule effectively prevents accidental contacts with the sharp edges of the ferrule.
- It has been found that though fabricating the crimpable sheet metal crossbar terminals for flexible fabric or plastic handles by die-punching a sheet metal, the drawbacks of the known process for fixing crossbar terminals are completely eliminated by forming the elongated or oblong shaped crossbar terminal body in the form of a tub by deep drawing the elongated body portion as obtained by die-stamping a strip of sheet metal. The drawing action is performed in a tub shaped mold using a corresponding pressing countermold and simultaneously also causes the bending of the two wings defined along the opposite sides of the flat die-stamped elongated body, thus preparing them to be eventually folded to crimp the fabric or plastic strip or cord, which is eventually pressed into the concavity of the tub formed elongated body.
- The deflection of the fabric or plastic cord or strip inside the concavity of the drawn crossbar terminal and the interference that is thus created between the fabric or plastic handle and the hem at at least one extremity of the tub, considerably enhances the resistance to the slipping-out of the extremity of the fabric handle, crimped by the folded wings inside the concavity.
- In use, the crimped crossbar terminal is pulled back in abutment with the inner surface of the hem of the bag by the weight of the bag suspended from the two flexible handles, as is disposes itself substantially cross-wire to the insertion hole of the bag hem.
- The crossbar terminal thus offers its convex face to contact with the hands or the objects being introduced or extracted from the bag, preventing in practice any possibility of contact with the cut edges of the die-stamped sheet metal and of the severed sacrificial metal bridging portions, all laying in the plane of the face that is pulled against the inner surface of the (commonly reinforced) hem of the bag.
- According to this invention, despite the drawing step that is contemplated in the new fabrication process of the crossbar terminals of this invention, they may be fabricated in the form of a continuous article of manufacture constituted by a chain of crossbar terminals defined by die-stamping and subsequently drawn in a mold, by retaining intact, even during the drawing step, the severable connecting metal bridges between juxtaposed extremities of the crossbar terminals adjacently formed along the sheet metal strip. As such, the continuous chain of formed crossbar terminals may be incrementally fed by normal automation techniques to the automatic machine that performs the crimping of the crossbar terminals on fabric or plastic handles, by folding the side wings to crimp the handle material pressed inside the oblong cavity of the tub formed crossbar terminal.
- The various aspects and advantages of this invention will become even more evident through the following description of a few embodiments and by referring to the attached drawings, wherein:
- Figures 1 and 2 show manufactured articles being produced in accordance with two different embodiments of this invention;
- Figure 3 is an enlarged view of a tub formed crossbar terminal before fastening a flexible handle cord thereto by crimping;
- Figure 4 shows a continuous article of manufacture consisting of a chain of tub formed crossbar terminals wound on a feed reel of a machine;
- Figure 5 shows a handle made with sheet metal crossbar terminals made in the process of this invention;
- Figures 6 and 7 show the manner in which flexible transport handles using the crossbar terminals made in the process of this invention are applied to a bag.
-
- The Figure 1 shows crossbar terminals being fabricated according to this invention in the form of a continuous chain of
crossbar terminals 1, joined byseverable bridges 2, from a strip 3 of sheet metal. - The strip 3 is generally made of a thin sheet of mild steel, tinned or otherwise treated or coated to resist oxidation, although other relatively ductile alloys may also be used. The thickness and width of the strip 3 are commensurate with the dimensions and mechanical properties desired for the crossbar terminals to be produced. The thickness may generally be comprised between 0.2 and 0.5 mm, and the width between 7 and 16 mm.
- In a first station of an automatic machine,
flat bodies 1p of an elongated or oblong shape and having twolateral wings 4 and 5 are formed by die-punching. The flat bodies are stamped in sequence by incrementally advancing the feed strip 3 through the die-punching station, and remain attached to each other by narrowseverable bridges 2, defined by the cutting perimeter of the die to connect the juxtaposed ends of two consecutively stamped bodies along he strip. - In a following station of the machine, the
flat bodies 1p defined by die-punching are drawn in a tub shaped mold by pressing the sheet metal with a countermold or dolly. While drawing the crossbar terminaloblong body 1, the twolateral wings 4 and 5 orient themselves perpendicularly to the oblong or elongated body being drawn inside the mold. - The Figure 2 is a simplified view of an alternative embodiment of the two step process of fabrication of a chain of a crossbar terminals.
- As can be observed by comparing Figures 1 and 2, the position of the two
lateral wings 4 and 5 with respect to the length of the tub shaped elongated die-stamped and drawn body of thecrossbar terminal 1 may be always the same (Figure 2) or alternately exchanged (Figure 1), depending on the feed requirements of the automatic crimping machine that fabricates the handles. - Moreover, while there may be only one, the drawing station after the die-stamping station thus contemplating the drawing of each
flat body 1p that incrementally reach it, by pressing each flat body between a tub shaped mold and its dolly, causing a plastic deformation of the ductile sheet metal according to a sequential forming of each die-stamped body that reach the station as depicted in Figure 1, the machine may alternatively be provided with two or even more drawing stations, identically equipped, after the first die-punching station. - If for example two drawing stations are used, the drawing may not be performed on each die-punched body reaching the drawing station immediately following the die-punching station in the direction of advancement of the feed metal strip, but alternatively on either the odd or even numbered bodies, while in the following drawing station the drawing is performed on the even or odd numbered flat bodies that were not drawn upon passing through the first station. As depicted in Figure 2, at the outlet of the machine the manufactured article that is produced according to the sequential drawing scheme of Figure 2, will turn out to be essentially equivalent to the manufactured article produced according to the sequential drawing scheme of Figure 1.
- An advantage of employing two or more drawing stations consists in providing for an enhanced freedom of plastic flowing of the sheet metal (induced by the drawing action), by permitting to a longer segment of the metal chain to contribute to the plastic flow of the metal in a longitudinal direction, thus limiting the concentration of strain in the bridging
portions 2 that could lead to premature raptures. - The enlarged detail of Figure 3 shows a crossbar terminal according to this invention fully formed and ready to receive the cord or flexible textile or plastic strip to be crimped thereupon, by folding the two lateral wings inside the concavity in the form of an oblong tub of the drawn body I of the crossbar terminal.
- Figure 4 shows an article of manufacture consisting of a chain of crossbar terminals made in the process of the invention wound on a feed reel of a handle-fabricating machine.
- Figure 5 shows a textile handle, with
metallic crossbar terminals 1 made according to this invention, crimped thereto, at the two extremities of a textile cord 6. - Figure 6 shows the way in which the handle is applied to the bag by passing each end of the cord 6, provided with the
relative crossbar terminal 1, through a hole 7 present near the hem. - Figure 7 shows a bag equipped with textile handles provided with crossbar terminals.
- Of course, as an alternative to a textile cord, the flexible handles may even be made with a fabric stripe or with a flexible plastic tubing.
- The sheet metal crossbar terminals fabricated according to the process of this invention may even be used in document folders, applied to the extremities of elastic cords that can be stretched and passed over foldable wings of the folder to prevent documents to slip out.
Claims (2)
- A fabrication process for an article of manufacture consisting of a continuous chain of crossbar terminals for flexible handles each in the form of an oblong tub of sheet metal defined by die-punching and deep drawing, having at least two lateral wings foldable to crimp an end of the flexible handle laid inside the concavity of said tub, joined one to another by severable bridges of sheet metal connecting the opposing ends of two adjacently formed oblong tub shaped terminals to be fed to an automatic machine for fabricating flexible or elastic handles with sheet metal crossbar terminals crimped onto the two ends of the handles, comprising the steps of:feeding a sheet metal ribbon to an automatic machine having a number of work stations;defining by die-punching in a first station of the machine an uninterrupted sequence of flat oblong bodies having at least two coplanar lateral wings and severable sheet metal bridges joining the opposing ends of adjacently defined flat bodies, incrementally advancing said ribbon after every die-punching step;deep drawing each of said die-punched flat oblong bodies in at least a second station of the machine equipped with a tub-shaped mold and cooperating pressing dolly, forming an oblong tub while simultaneously orienting said lateral wings extending from the respective straight side of the hem of the formed oblong tub, without severing said connecting sheet metal bridges.
- The process according to claim 1, characterized in that in a first station following said die-punching station, the deep drawing is performed on odd numbered die-punched flat bodies while in a second drawing station following said first drawing station the deep drawing is performed on even numbered die-punched bodies.
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT03425030T ATE272547T1 (en) | 2003-01-23 | 2003-01-23 | PROCESS OF PRODUCTION OF CRIMPABLE METAL CROSSBARS FOR CARRYING CORDS |
EP03425030A EP1440897B1 (en) | 2003-01-23 | 2003-01-23 | Fabrication process for crimpable metallic crossbar terminals for flexible handles |
ES03425030T ES2225812T3 (en) | 2003-01-23 | 2003-01-23 | MANUFACTURING PROCESS OF CRIMPABLE CROSSBODY METAL TERMINALS FOR FLEXIBLE HANDLES. |
DE60300018T DE60300018T2 (en) | 2003-01-23 | 2003-01-23 | Production method of crimpable metallic crossbars for carrying cords |
PT03425030T PT1440897E (en) | 2003-01-23 | 2003-01-23 | METHOD FOR THE MANUFACTURE OF TERMINALS WITH CROSS-METAL CRANKS FOR FLEXIBLE PEGAS |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03425030A EP1440897B1 (en) | 2003-01-23 | 2003-01-23 | Fabrication process for crimpable metallic crossbar terminals for flexible handles |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1440897A1 EP1440897A1 (en) | 2004-07-28 |
EP1440897B1 true EP1440897B1 (en) | 2004-08-04 |
Family
ID=32524304
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP03425030A Expired - Lifetime EP1440897B1 (en) | 2003-01-23 | 2003-01-23 | Fabrication process for crimpable metallic crossbar terminals for flexible handles |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1440897B1 (en) |
AT (1) | ATE272547T1 (en) |
DE (1) | DE60300018T2 (en) |
ES (1) | ES2225812T3 (en) |
PT (1) | PT1440897E (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102712161B (en) | 2009-11-30 | 2014-01-22 | 鲁杰罗·佩罗尼公司 | Method of fabricating shopper bags and associated automated fabrication line |
US8256063B2 (en) * | 2010-04-15 | 2012-09-04 | The Lindy Bowman Company | Strap with rigid barbs |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BE549349A (en) * | 1955-07-07 | |||
IT249198Y1 (en) * | 2000-05-26 | 2003-04-03 | Carlo Spaziani | ANTI-SCRATCH LEADED LACE. |
-
2003
- 2003-01-23 EP EP03425030A patent/EP1440897B1/en not_active Expired - Lifetime
- 2003-01-23 AT AT03425030T patent/ATE272547T1/en not_active IP Right Cessation
- 2003-01-23 ES ES03425030T patent/ES2225812T3/en not_active Expired - Lifetime
- 2003-01-23 DE DE60300018T patent/DE60300018T2/en not_active Expired - Lifetime
- 2003-01-23 PT PT03425030T patent/PT1440897E/en unknown
Also Published As
Publication number | Publication date |
---|---|
PT1440897E (en) | 2004-11-30 |
DE60300018T2 (en) | 2005-09-08 |
EP1440897A1 (en) | 2004-07-28 |
ES2225812T3 (en) | 2005-03-16 |
DE60300018D1 (en) | 2004-09-09 |
ATE272547T1 (en) | 2004-08-15 |
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