EP3858513A1 - Boucle de sangle et procédé de fabrication d'une telle boucle de sangle - Google Patents

Boucle de sangle et procédé de fabrication d'une telle boucle de sangle Download PDF

Info

Publication number
EP3858513A1
EP3858513A1 EP21154070.3A EP21154070A EP3858513A1 EP 3858513 A1 EP3858513 A1 EP 3858513A1 EP 21154070 A EP21154070 A EP 21154070A EP 3858513 A1 EP3858513 A1 EP 3858513A1
Authority
EP
European Patent Office
Prior art keywords
leg
flattened
distal
track
buckle
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.)
Granted
Application number
EP21154070.3A
Other languages
German (de)
English (en)
Other versions
EP3858513B1 (fr
EP3858513C0 (fr
Inventor
Johannes Philippus Blok
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.)
Blok's Draadvorm Fabriek BV
Original Assignee
Blok's Draadvorm Fabriek BV
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 Blok's Draadvorm Fabriek BV filed Critical Blok's Draadvorm Fabriek BV
Publication of EP3858513A1 publication Critical patent/EP3858513A1/fr
Application granted granted Critical
Publication of EP3858513B1 publication Critical patent/EP3858513B1/fr
Publication of EP3858513C0 publication Critical patent/EP3858513C0/fr
Active 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
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F1/00—Bending wire other than coiling; Straightening wire
    • B21F1/004—Bending wire other than coiling; Straightening wire by means of press-type tooling
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B11/00—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts
    • A44B11/02—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts frictionally engaging surface of straps
    • A44B11/06—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts frictionally engaging surface of straps with clamping devices
    • A44B11/065—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts frictionally engaging surface of straps with clamping devices with strap tightening means
    • A—HUMAN NECESSITIES
    • A44—HABERDASHERY; JEWELLERY
    • A44B—BUTTONS, PINS, BUCKLES, SLIDE FASTENERS, OR THE LIKE
    • A44B11/00—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts
    • A44B11/02—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts frictionally engaging surface of straps
    • A44B11/18—Strap held by threading through linked rings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F1/00—Bending wire other than coiling; Straightening wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F45/00—Wire-working in the manufacture of other particular articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F45/00—Wire-working in the manufacture of other particular articles
    • B21F45/16—Wire-working in the manufacture of other particular articles of devices for fastening or securing purposes

Definitions

  • the invention relates to a method for manufacturing a strap buckle. Also, the invention relates to a strap buckle manufactured according to the method.
  • Buckles for flexible strapping are known in the art for securing goods during transportation and storage.
  • a (strap) buckle is for example known from US 3377666 : the buckle includes a single piece of wire bent to have (a) a first, generally U-shaped portion including a first distal leg formed from one end of said single piece of wire, a first proximal leg and a bight; (b) a second, generally U-shaped portion including a second distal leg formed from the other end of said single piece of wire, a second proximal leg and a bight; (c) an intermediate wire portion connecting the proximal leg of each U-shaped portion; said two proximal legs and said intermediate wire portion lying in a first plane and having a U-shaped configuration; said two distal legs lying parallel to each other in a second plane; each of said bights extending from said first plane to said second plane.
  • a flexible strap is guided at one end around the first distal leg and between the first distal leg and the second proximal leg. Likewise, the flexible strap is guided at the other end around the second distal leg and between the second distal leg and the associated first proximal leg.
  • the strap e.g., around goods
  • a force is exerted that closes the gap between the first distal leg and the second proximal leg, and between the second distal leg and the first proximal leg, respectively. associated mid-section.
  • the flexible strap is clamped in a fixed position by the buckle.
  • notches are formed on the intermediate wire portions, that block the distal legs from bending toward each other.
  • the objective is achieved by a method for manufacturing a strap buckle comprising:
  • the method allows to create the first flattened track in the wire piece well before the bending operation, which simplifies the manufacturing process in comparison to the method of the prior art.
  • the flattened track improves the mechanical properties of the buckle: strengthening of the wire piece occurs due to the plastic deformation that creates the flattened track. This provides that the buckle is more resistant to elastic bending under the load of the strap.
  • the strap in operation under tension of a flexible strap that is attached at one end to the first distal leg and at the other end to the second distal leg, in the buckle the strap is tightened around the distal legs: the strap is forced against the surface of the flattened track of each distal leg, in which the edges of the track provide distinct points of contact with the strap. At these points the force on the strap is locally increased which advantageously provides that the pressed strap is strongly retained at a fixed position, substantially free of slippage. Due to the reduction of slippage occurring, the operational load on the strap can be increased even further before slippage will occur.
  • the invention provides a method as described above, wherein the first flattened track is created on the stamped elongate wire member under the first angle being in the first planar region that is common to the longitudinal axes of both the end sections and the longitudinal axis of the mid-section part; and the first flattened tracked of the first distal leg is facing towards the second proximal leg and the first flattened track of the second distal leg is facing towards the first proximal leg.
  • the first angle is about 90 degrees with respect to first radial direction of the displacement.
  • the flattened track improves the mechanical properties of the buckle by providing a contact surface where the strap is clamped:
  • the distal legs are each elastically displaced towards the associated proximal leg.
  • the flattened track of each distal leg is forced against the surface of the associated proximal leg, with the strap being pressed between each pair of distal and proximal leg.
  • the contact surface between the distal leg and the proximal leg is enlarged which advantageously assists to keep the pressed strap strongly retained at a fixed position, free of slippage. Also, the enlarged contact surface between the distal leg and proximal leg allows that the tension in the strap can be increased which advantageously provides that goods can be strapped under high load.
  • the at least one additional flattened track is created under the second angle being in a second planar region opposite the first planar region and common to the longitudinal axes of both the end-sections and the longitudinal axis of the mid-section part; the creation of the second flattened track providing that the first flattened track of the first distal leg is facing towards a second flattened track of the second proximal leg and the first flattened track of the second distal leg is facing towards a second flattened track of the first proximal leg.
  • the first flattened track and/or the at least one additional flattened track is created on the wire material before creating the elongate wire member from the wire material.
  • the first flattened track and/or the at least one additional flattened track is created by plastic deformation of the elongate wire member.
  • the method comprises creating a surface structure or roughness on the first and/or at least one additional flattened tracks.
  • an at least one additional flattened track is created in a direction under a secondary angle opposite to direction under the first angle.
  • the at least one additional flattened track provides edges that are forced against the tightened strap additional points of contact are created that counteract slippage of the strap over the surface of the distal leg(s).
  • the contact surface is increased which allows a further increase of the operational load on the strap before slippage of the strap will occur. As a result, the tension in the strap can be increased even further.
  • the invention provides a buckle manufactured from a single piece of wire having:
  • a buckle as described above, wherein the first angle of the first flattened track of the first distal leg is such that the first flattened track is facing towards the second proximal leg and the first flattened track of the second distal leg is facing towards the first proximal leg.
  • a buckle as described above, wherein the buckle is configured that in operation, under tension of a flexible strap attached at one end to the first distal leg and attached at the other end to the second distal leg, the first flattened track of the first distal leg is forced against the second proximal leg and the first flattened track of the second distal leg is forced against the first proximal leg, in such a manner that the strap is clamped between the first flattened track of the first distal leg and the second proximal leg and between first flattened track of the second distal leg and the first proximal leg.
  • Figure 1 schematically shows a wire piece 1 for forming a buckle.
  • the buckle is made from a single elongated wire piece of metal.
  • the material and diameter of the wire piece 1 can be chosen based on a desired strength of the buckle that is fabricated.
  • the wire piece can be a steel wire piece with a diameter of about 8 mm.
  • Figure 2 schematically shows a first step for forming the buckle according to an embodiment of the invention.
  • the wire piece 1 is stamped. End sections 2, 3 of the wire piece are created that are each parallel to and that are transversely displaced with respect to a mid-section part 4. The end sections 2, 3 are displaced over a similar distance 20 in a first radial direction R with respect to the mid-section part 4. Further, a first (relatively) flattened longitudinal track 5 is created on the stamped elongate wire member under a first angle with the first radial direction R in a first planar region that is common to the longitudinal axes A2; A3 of both the end sections 2, 3 and the longitudinal axis A1 of the mid-section part 4. The first track 5 may be created by stamping or by machining. The first track 5 may extend along at least the end sections 2, 3 or along the end sections and the mid-section part 4.
  • the width of the first track 5 may about 1 mm or more in the example of a wire piece with 8 mm diameter.
  • the flattened longitudinal track may be created on the wire before the wire piece is fabricated from the wire.
  • Figure 3 schematically shows a top view of a buckle manufactured in accordance with an embodiment of the invention.
  • Figure 4 schematically shows a bottom view of the buckle of Figure 3 .
  • Figure 6 schematically shows a side view of the buckle of Figures 3 and 4 .
  • the wire piece is subjected to a bending process to form a buckle 10.
  • the buckle 10 consists of a substantially quadrilateral loop in which a first, generally U-shaped portion of the wire piece has a first distal leg 12 formed from one end section 2 of the single piece of wire, a first proximal leg 14 formed from a portion of the mid-section part 4 and a first bight 15 interconnecting the first distal leg and the first proximal leg.
  • a second, generally U-shaped portion of the wire piece has a second distal leg 13 formed from the other end section 3 of the wire piece, a second proximal leg 16 formed from another portion of the mid-section part 4 and a second bight 17 interconnecting the second distal leg and the second proximal leg.
  • the buckle has an intermediate wire portion 18 that connects the proximal legs 14, 16 of each U-shaped portion, thus also forming a U-shape 14, 18, 16.
  • Figure 5 shows a detailed cross-section of a portion of the buckle in accordance with an embodiment of the invention.
  • the first flattened track is under an oblique first angle with the radial direction of the displacement. Due to this orientation, the first flattened track 5 on the second distal leg 13 will not be facing towards the surface of the first proximal leg 14 (and the first distal leg 12 will not be facing towards the surface of the second proximal leg 16, but not shown here). However, a strap 22 that is tightened will forced against the circumference of the distal leg where the edges 5a, 5b of the track 5 will form local protrusions.
  • the two proximal legs 14, 16 and the intermediate wire portion 18 form a U-shape with the proximal legs parallel to each other and are in a first plane P1 of the buckle 10.
  • the two distal legs 12, 13 are parallel to each other in a second plane P2 of the buckle 10 above the first plane.
  • the two distal legs 12, 13 are substantially parallel to the two proximal legs 14, 16 while the first distal leg 12 is above the second proximal leg 16 and the second distal leg 13 is above the first proximal leg 14.
  • a gap 20 is present under unloaded conditions (no load on the buckle).
  • the bending process to create the buckle 10 is configured in such a manner that the flattened track 5 (indicated by dashed lines) on the first and second distal legs 12, 13 in the second plane P2 is substantially facing towards the proximal legs in the first plane P1.
  • Figure 7 schematically shows the side view of the buckle of Figure 5 with an unloaded strap.
  • a flexible strap is attached to the buckle 10 at one end to the first distal leg 12 and at another end to the second distal leg 13.
  • One end 22 of the strap runs around the first distal leg 12 by means of a first loop 23.
  • the incoming and outgoing parts of the strap end 22 are guided around the inward portion of the second proximal leg 16 in outward direction X1.
  • the other end 24 of the strap runs around the second distal leg 13 by means of a second loop 25.
  • the incoming and outgoing parts of the strap end 24 are guided around the inward portion of the second proximal leg 14 in outward direction X2 opposite to direction X1.
  • Figure 8A schematically shows the side view of the buckle with loaded strap.
  • Figure 8B shows a detail of the arrangement of the strap on the distal leg.
  • a clamping force F2 is exerted on the distal legs 12; 13 in a manner that the flattened track 5 of the first distal leg 12 is forced against the surface of the second proximal leg 16 and the flattened track 5 of the second distal leg 13 is forced against the surface of the first proximal leg 14.
  • the flattened tracks 5 are configured to enlarge the contact surfaces between the distal and proximal legs, which provide that slippage is relatively reduced and, if required, larger clamping forces F2 and larger strapping forces F1 can be applied.
  • FIG 9 shows a detailed cross-section of a portion of a buckle 11 in accordance with a further embodiment of the invention.
  • a second flattened track 6 is created on the stamped wire piece at an opposite side facing away from the first flattened track 5.
  • the first flattened track 5 on the distal leg 12; 13 is facing the second flattened track 6 on the associated proximal leg 16; 14.
  • the arrangement of the first and second flattened tracks 5, 6 is such that under loaded conditions the strap is pressed between the first and second flattened tracks. As a result, the slippage of the strap will be reduced further and even larger clamping forces F2 and larger strapping forces F1 can be applied in this embodiment.
  • the second flattened track 6 may extend along at least the end sections 2, 3 or along the end sections and the mid-section part 4.
  • the width of the second track 6 is comparable to the width of the first track 5.
  • the flattened track/tracks 5, 6 can be provided with a coating or a surface structure to create a roughness on the surface of the tracks.
  • the coating may be created by a chemical (dry or wet) or electrochemical process.
  • the surface structure may be created by either a mechanical process, a chemical (dry or wet) or electrochemical process. Such processes are known to the skilled in the art.
  • the surface structure comprises ripple marks (not shown) extending in longitudinal direction.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Package Frames And Binding Bands (AREA)
EP21154070.3A 2020-01-28 2021-01-28 Boucle de sangle et procédé de fabrication d'une telle boucle de sangle Active EP3858513B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL2024780A NL2024780B1 (en) 2020-01-28 2020-01-28 A strap buckle and a method for manufacturing such a strap buckle

Publications (3)

Publication Number Publication Date
EP3858513A1 true EP3858513A1 (fr) 2021-08-04
EP3858513B1 EP3858513B1 (fr) 2023-07-26
EP3858513C0 EP3858513C0 (fr) 2023-07-26

Family

ID=69904191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21154070.3A Active EP3858513B1 (fr) 2020-01-28 2021-01-28 Boucle de sangle et procédé de fabrication d'une telle boucle de sangle

Country Status (2)

Country Link
EP (1) EP3858513B1 (fr)
NL (1) NL2024780B1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR323499A (fr) * 1902-08-05 1903-03-07 Maquet Felix Anton Machine à fabriquer les leviers coudés de fermeture pour bouchons mécaniques à ressorts
US2087490A (en) * 1932-03-29 1937-07-20 Galveston Buckle Company Buckle forming machine
US3377666A (en) 1966-07-20 1968-04-16 American Mfg Company Inc Buckle for flexible strapping
NL2015180B1 (nl) * 2015-07-16 2017-02-02 Marel Stork Poultry Proc Bv Schalmenketting en werkwijze voor het produceren daarvan.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR323499A (fr) * 1902-08-05 1903-03-07 Maquet Felix Anton Machine à fabriquer les leviers coudés de fermeture pour bouchons mécaniques à ressorts
US2087490A (en) * 1932-03-29 1937-07-20 Galveston Buckle Company Buckle forming machine
US3377666A (en) 1966-07-20 1968-04-16 American Mfg Company Inc Buckle for flexible strapping
NL2015180B1 (nl) * 2015-07-16 2017-02-02 Marel Stork Poultry Proc Bv Schalmenketting en werkwijze voor het produceren daarvan.

Also Published As

Publication number Publication date
EP3858513B1 (fr) 2023-07-26
NL2024780B1 (en) 2021-09-09
EP3858513C0 (fr) 2023-07-26

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