WO1994019254A1 - Fastening device - Google Patents

Fastening device Download PDF

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Publication number
WO1994019254A1
WO1994019254A1 PCT/FI1994/000065 FI9400065W WO9419254A1 WO 1994019254 A1 WO1994019254 A1 WO 1994019254A1 FI 9400065 W FI9400065 W FI 9400065W WO 9419254 A1 WO9419254 A1 WO 9419254A1
Authority
WO
WIPO (PCT)
Prior art keywords
load belt
sheet metal
accordance
clasp
load
Prior art date
Application number
PCT/FI1994/000065
Other languages
French (fr)
Inventor
Erkki Vaara
Original Assignee
Erkki Vaara
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 Erkki Vaara filed Critical Erkki Vaara
Publication of WO1994019254A1 publication Critical patent/WO1994019254A1/en

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Classifications

    • 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
    • A44B11/04—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts frictionally engaging surface of straps without movable parts
    • 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
    • B65D63/00—Flexible elongated elements, e.g. straps, for bundling or supporting articles
    • B65D63/10—Non-metallic straps, tapes, or bands; Filamentary elements, e.g. strings, threads or wires; Joints between ends thereof
    • B65D63/14—Joints produced by application of separate securing members
    • B65D63/16—Joints using buckles, wedges, or like locking members attached to the end of the element

Definitions

  • the object of the invention is a load belt clasp for locking the two ends of a load belt to one another, which includes a loop bar on both sides and in the centre of the direction of pull of this or in the region of it a bending edge of a counter bar, ion which case the end of the load belt can be brought over the bending edge from the opposite side of the loop bar and further threaded round the loop bar and finally round the bending edge back to the direction of pull, when part of the load belt remains between the incoming load belt and the bending edge, thus creating a friction lock of the tensioned load belt.
  • a load belt clasp of the type referred to in the introduction is presented in Swedish patent publication number 450621.
  • a self- locking load belt clasp is generally created by arranging a suitable loop bar through an opening formed in the clasp in such a way that a loop of the load belt turned round the loop bar must make a sharp bend, when a friction-locked joint is automatically formed.
  • the tensile strength of one typical load belt is 1800 kiloponds, but the improved model from the holder of the above patent withstands only 1300 kiloponds.
  • the problem is mainly shearing in the belt, which is in part influenced by deformation under tension due to the construction of the load belt clasp, which in turn create an uneven loading in the cross-section of the belt.
  • Load belt clasps consisting of two separate plates are presented in patent publications US 3,121,270 and DE-B-1557 535.
  • the straight sheet metal components bend under heavy loads nor is the tensile strength of the load belt properly exploited.
  • the intention of this invention is to create a new kind of load belt clasp, by means of which the tensile strength of the load belt can be exploited more fully.
  • the characteristic features of a load belt clasp in accordance with the invention are presented in the accompanying Patent Claims.
  • the load belt clasp is advantageously formed of two similar essentially rectangular sheet metal pieces, both ends of which can act as either a loop bar or counter bar, depending on the direction of the threading of the load belt.
  • Figure l shows the load belt clasp in partial cross- section and the threading of the load belt through it.
  • Figure 2 shows the load belt clasp in an axonometric view.
  • Figure 3 shows the construction of the load belt clasp in detail as a partial enlargement.
  • the load belt clasp 1 is constructed of two pieces 6 of sheet metal, in both of which there is an opening in the centre and which are attached to one another by means of attachment 7, which is advantageously spot welding.
  • the sheet metal components 6 include loop bar 2 and counter bar 2' as operational parts, the edge of which towards the centre forms bending edge 3. On account of their symmetrical construction these components can change places, if the threading of the load belt takes place from the other side.
  • the sheet metal components 6 include a flexible bend 8 near to the attachment point and stiffening bend 9 in the loop bar 2 and the counter bar 2* , Figures 1 and 2.
  • the sheet metal pieces can part in a V-shape, i.e. the profile of the piece would be X-shaped.
  • the stiffening bend 9 is practical ⁇ ly essential, because in order to create a spring-effect the thickness of the sheet cannot be increased, but additional stiffness is required in the ends.
  • Figure 3 shows a partial enlargement of the load belt, in which the depression in the one sheet metal component 6 left by the spot welding used as an attachment 7 is drawn.
  • the Figure also clearly shows how the loop bar 2 and the counter bar 2• leave a gap between them, which closes due to tension thus squeezing the load belt into place. This flexing of the loop and counter bars 2 and 2' can be controlled by shaping the spring bend 8.
  • the loading values can be improved by using boric steel.
  • the spring-like arm is formed of the part at the side of the opening, which extends from the attachment point to the bar.
  • inventive concept can be applied to a one-sided attachment too for securing a single load belt end, even though applications of this type are not known at present.
  • load belt clasps include pain ⁇ ting or plastic coating, which rounds the corners.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Clamps And Clips (AREA)

Abstract

The object of the invention is a load belt clasp (1) for locking the two ends of a load belt (4) to one another, which includes on both sides a loop bar (2) and, in the centre of the direction of pull of this or in the region of it, a bending edge (3) of a counter bar (2'). The load belt clasp (1) consists essentially of two sheet metal components (6) attached to one another, both of which have an opening in the centre and at least one of which forms loop bars (2) that border the opening and at least one of which forms counter bars (2') with bending edges (3) that border the opening.

Description

FASTENING DEVICE.
The object of the invention is a load belt clasp for locking the two ends of a load belt to one another, which includes a loop bar on both sides and in the centre of the direction of pull of this or in the region of it a bending edge of a counter bar, ion which case the end of the load belt can be brought over the bending edge from the opposite side of the loop bar and further threaded round the loop bar and finally round the bending edge back to the direction of pull, when part of the load belt remains between the incoming load belt and the bending edge, thus creating a friction lock of the tensioned load belt.
A load belt clasp of the type referred to in the introduction is presented in Swedish patent publication number 450621. A self- locking load belt clasp is generally created by arranging a suitable loop bar through an opening formed in the clasp in such a way that a loop of the load belt turned round the loop bar must make a sharp bend, when a friction-locked joint is automatically formed.
The tensile strength of one typical load belt is 1800 kiloponds, but the improved model from the holder of the above patent withstands only 1300 kiloponds. The problem is mainly shearing in the belt, which is in part influenced by deformation under tension due to the construction of the load belt clasp, which in turn create an uneven loading in the cross-section of the belt.
Load belt clasps consisting of two separate plates are presented in patent publications US 3,121,270 and DE-B-1557 535. The straight sheet metal components bend under heavy loads nor is the tensile strength of the load belt properly exploited.
The intention of this invention is to create a new kind of load belt clasp, by means of which the tensile strength of the load belt can be exploited more fully. The characteristic features of a load belt clasp in accordance with the invention are presented in the accompanying Patent Claims. When the load belt clasp is formed of two sheet metal components, a greater degree of freedom is brought to the construction, which makes possible optimum dimensioning. The load belt clasp is advantageously formed of two similar essentially rectangular sheet metal pieces, both ends of which can act as either a loop bar or counter bar, depending on the direction of the threading of the load belt.
Other advantages and forms of application of the invention appear later.
In what follows the invention is illustrated with reference to the accompanying Figures, which show one load belt clasp in accordance with the invention.
Figure l shows the load belt clasp in partial cross- section and the threading of the load belt through it.
Figure 2 shows the load belt clasp in an axonometric view.
Figure 3 shows the construction of the load belt clasp in detail as a partial enlargement.
The load belt clasp 1 is constructed of two pieces 6 of sheet metal, in both of which there is an opening in the centre and which are attached to one another by means of attachment 7, which is advantageously spot welding. When the load belt 4 is secured symmetrically to the load belt clasp 1, no great stres¬ ses are created in attachment 7. Even if the attachment fails, the load belts are not able to free themselves. The sheet metal components 6 include loop bar 2 and counter bar 2' as operational parts, the edge of which towards the centre forms bending edge 3. On account of their symmetrical construction these components can change places, if the threading of the load belt takes place from the other side.
The sheet metal components 6 include a flexible bend 8 near to the attachment point and stiffening bend 9 in the loop bar 2 and the counter bar 2* , Figures 1 and 2. The stiffening bends 9, which in accordance with the Figures are directed outwards, also assist in the threading of the load belt. Alternatively the sheet metal pieces can part in a V-shape, i.e. the profile of the piece would be X-shaped. The stiffening bend 9 is practical¬ ly essential, because in order to create a spring-effect the thickness of the sheet cannot be increased, but additional stiffness is required in the ends.
Figure 3 shows a partial enlargement of the load belt, in which the depression in the one sheet metal component 6 left by the spot welding used as an attachment 7 is drawn. The Figure also clearly shows how the loop bar 2 and the counter bar 2• leave a gap between them, which closes due to tension thus squeezing the load belt into place. This flexing of the loop and counter bars 2 and 2' can be controlled by shaping the spring bend 8.
A 98 g weight load belt clasp in accordance with the Figure, equipped with a 50 mm maximum belt width, in which 2,5 mm St52 tempered steel was used, achieved a breaking strain of 2600 kg, whereas the previously known 93 g weight load belt clasp did not achieved a breaking strain of 200 kg. The loading values can be improved by using boric steel. By means of a load belt clasp in accordance with the invention the tensile strength of the load belt itself can be more fully exploited.
The flexing properties of a load belt clasp manufactured from steel sheet can be illustrated by the following equation:
I I3 1
20 — < -=— < 80 — mm Ds3 trøπ in which 1 is the length of the spring-like arm, d is its width, and s is the thickness of the sheet metal. The most advantageous expression has the value 50 1/mm. Here the spring-like arm is formed of the part at the side of the opening, which extends from the attachment point to the bar.
Naturally, the inventive concept can be applied to a one-sided attachment too for securing a single load belt end, even though applications of this type are not known at present. In order to round the corners the pressed sheet metal components are ground before attachment. In addition, load belt clasps include pain¬ ting or plastic coating, which rounds the corners.

Claims

Patent Claims
1. A load belt clasp (1) for locking the two ends of a load belt (4) to one another, which includes two sheet metal components, in both of which there is an opening in the centre forming on both sides in one sheet metal component a loop bar (2) and in the centre of the direction of pull of this or in the region of it a bending edge (3) of a counter bar (2'), in which case the end (5) of the load belt (4) can be brought over the bending edge (3) from the opposite side of the loop bar and further threaded round the loop bar (2) and finally round the bending edge (3) back to the direction of pull, when part of the load belt remains between the incoming load belt (4) and the bending edge (3) thus creating a friction lock of the tensioned load belt (4), characterized in that the sheet metal components (6) are attached to one another thus setting at each end the loop bar (2) and the counter bar (2') near to one another at a small distance apart and that at least one sheet metal component is arranged to flex in such a way that under the influence of the load the loop bar (2) and the counter bar (2') press together squeezing the load belt (4) between them and increasing frictional force.
2. A load belt clasp (1) in accordance with Patent Claim l, characterized in that in at least one sheet metal component there is a spring bend (8) near to the attachment (7) in such a way that beginning from the attachment (7) the spring metal components (6) at first move away from one another and then come close to one another.
3. A load belt clasp (1) in accordance with Patent Claim 1, characterized in that, seen from the side the sheet metal components form an essentially X-shaped piece.
4. A load belt clasp (1) in accordance with Patent
Claims 1, 2, or 3, characterized in that the loop or counter bar (2, 2') of at least one sheet metal component includes a trans¬ verse stiffening bend (9) .
5. A load belt clasp (1) in accordance with one of Patent Claims 1 - 4, characterized in that the attachment (7) between the sheet metal components (6) consists of spot welding.
6. A load belt clasp (1) in accordance with one of
Patent Claims 1 - 5, characterized in that the initial blanks of the sheet metal components are essentially rectangular, as are their openings.
7. A load belt clasp (1) in accordance with one of
Patent Claims 1 - 6, characterized in that the aforesaid two sheet metal components (6) are similar and that they are at¬ tached to one another on both sides of the opening in the centre in relation to the direction of pull.
8. A load belt clasp (1) in accordance with one of Patent Claims 1 - 7, characterized in that the aforesaid two sheet metal components are of heat-treated steel.
9. A load belt clasp (1) in accordance with one of
Patent Claims 1 - 8, characterized in that the spring properties of the steel load belt clasp are expressed in accordance with the conditions of the following equation:
Figure imgf000008_0001
in which 1 is the length of the spring-like arm, d is its width, and s is the thickness of the sheet metal.
PCT/FI1994/000065 1993-02-17 1994-02-16 Fastening device WO1994019254A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI930688A FI92794C (en) 1993-02-17 1993-02-17 Kuormavyölukko
FI930688 1993-02-17

Publications (1)

Publication Number Publication Date
WO1994019254A1 true WO1994019254A1 (en) 1994-09-01

Family

ID=8537400

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1994/000065 WO1994019254A1 (en) 1993-02-17 1994-02-16 Fastening device

Country Status (2)

Country Link
FI (1) FI92794C (en)
WO (1) WO1994019254A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018004A1 (en) * 1997-10-08 1999-04-15 Europa Packaging Company Limited Buckle

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH475138A (en) * 1966-10-14 1969-07-15 Forsch Anstalt Fur Mechanik Device for connecting the ends of a tie by wedging
AU6804181A (en) * 1980-03-04 1981-09-10 Gerrard Strapping Systems Pty. Ltd. Buckle
SE450621B (en) * 1985-11-27 1987-07-13 Linvent Ab DEVICE FOR A DRAGON ORGANIZED PROVIDER

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH475138A (en) * 1966-10-14 1969-07-15 Forsch Anstalt Fur Mechanik Device for connecting the ends of a tie by wedging
AU6804181A (en) * 1980-03-04 1981-09-10 Gerrard Strapping Systems Pty. Ltd. Buckle
SE450621B (en) * 1985-11-27 1987-07-13 Linvent Ab DEVICE FOR A DRAGON ORGANIZED PROVIDER

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1999018004A1 (en) * 1997-10-08 1999-04-15 Europa Packaging Company Limited Buckle
AU733506B2 (en) * 1997-10-08 2001-05-17 Europa Packaging Company Limited Buckle
US6553632B1 (en) 1997-10-08 2003-04-29 Europa Packaging Company Limited Buckle

Also Published As

Publication number Publication date
FI92794B (en) 1994-09-30
FI92794C (en) 1995-01-10
FI930688A0 (en) 1993-02-17

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