Classifications

• • A—HUMAN NECESSITIES
  • A62—LIFE-SAVING; FIRE-FIGHTING
  • A62B—DEVICES, APPARATUS OR METHODS FOR LIFE-SAVING
  • A62B35/00—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion
  • A62B35/04—Safety belts or body harnesses; Similar equipment for limiting displacement of the human body, especially in case of sudden changes of motion incorporating energy absorbing means

Definitions

• the invention relates to the technical sector of safety means for absorbing a fall, braking a speed and more generally, absorbing energy.
• shock absorbing straps are composed of two independent plies woven over a determined length and linked together by interlacing of an additional so-called binding chain in order to constitute a uniform section.
• the tying chain constitutes a point of connection and of rupture during a tensile force exerted on the free parts of the plies which thus tends to separate the two plies linked against the resistance formed by the woven tying threads acting as successive shock absorbers until they break.
• This type of damping strap comprises a part, of determined length, according to which the two plies of wires are juxtaposed and intimately linked under the conditions indicated described in the patent cited above, for example.
• One of the ends of this part where the two layers are intimately linked has two unitary strands independent of each other.
• one of these strands is arranged to be connected to a fixed part, while the other strand is arranged to be connected to a mobile part which can move under a given force. If a tensile or other force is exerted on at least one of the strands, this results in a tensioning which relates to the level of the binding chain up to the point of rupture between the two intimately linked plies. This results, concomitantly, in a successive and continuous tearing of the two linked plies, acting as shock absorbers and energy absorbers.
• the other end of the linked part of the two plies, opposite the two free strands connected to the fixed and mobile points, may have two free strands connected to each other, to form a loop of security.
• these safety straps must meet specific standards.
• the pull-out force between the two intimately linked layers must correspond to numerical values.
• the object of the invention is to remedy these drawbacks in a simple, safe, effective and rational manner.
• the problem which the invention proposes to solve is being able, with respect to a standard width of straps, to double the pulling force, or else to very significantly reduce the width of a standard strap while keeping the same force for this purpose. tearing, as required by safety standards.
• a shock absorbing strap has been designed and developed consisting of two plies of juxtaposed wires, and having a new structure making it possible to obtain such results.
• the damping strap successively has:
• the free ends of the first and third parts are not linked to each constitute two free strands connected together so as to form a safety loop.
• the first and third parts are intimately linked by assembly means capable of acting as a shock absorber by allowing the plies of each of said layers to be torn continuously and gradually parts when the strands of the second part are subjected to a tensile force;
• the plies are obtained by weaving.
• the means of assembling the two plies of the first and third parts consist of an additional binding chain.
• Figure 1 is a perspective view of the strap according to the features of the invention.
• Figure 2 is a schematic view of the strap in the normal position of use, that is to say when no tensile or other force is exerted on the free strands.
• Figure 3 is a view corresponding to Figure 2, showing the beginning of tearing of the two juxtaposed and intimately linked parts of the strap when the free strands are subjected to a tensile force.
• FIG. 4 is a view corresponding to FIG. 3, in the position of maximum tearing of the two juxtaposed and intimately linked plies of the strap.
• the shock absorbing safety strap according to the invention consists of two plies of juxtaposed wires (1) and (2).
• the strap has a first part (A) of determined length (L) where the two plies (1) and (2) are juxtaposed and intimately linked with capacity to tear under an effort of traction.
• the strap has a third part (B) of reduced length and where the two plies (1) and (2), juxtaposed are free relative to each other, to form two strands (la) and (lb).
• This second part is extended by a third part (C) of determined length (L) where the two juxtaposed sheets (1) and (2) are intimately linked in the same way as for part (A) with tearing capacity under a tensile force.
• the free strands (la) and (lb) are intended to be connected respectively to a fixed point and to a mobile point or to two mobile points or even to two fixed points.
• the first and third parts (A) and (C) are of equal length (L).
• the free ends of parts (A) and (C), opposite the ends where the strands (la) and (lb) are formed are not linked, to each constitute two free strands (le) (ld) and ( 2c) (2d), interconnected by sewing (3) or otherwise, so as to form a safety loop.
• Parts (A) and (C) are juxtaposed and intimately linked by assembly means capable of acting as shock absorbers, allowing continuous and progressive tearing of the plies of each of said parts (A) and (C ), when the strands (la) and / or (lb) are subjected to a tensile force (FI) and (F2).
• FI tensile force
• F2 tensile force
• the binding of the two parts (A) and (C) is carried out according to the technical characteristics defined in patent FR 2371533. It is recalled in this regard that the binding warp threads are successively fixed during the assembly of the plies and differently with respect to each other, with regard to the variable strokes of passage of the weft threads in an irregular tying, so that their interlacing differs longitudinally and transversely, to constitute a plurality of different successive groups allowing a progressive and sliding of each group, when the other groups are energized. These arrangements allow regular tearing and slowing down of the mobile part of the strap, in relation to the strength of the tying chain.
• a woven safety strap having only one part where the two plies of threads are juxtaposed and intimately linked should be woven according to a width (1) corresponding to the force criteria d uprooting dictated by safety standards.
• the shock-absorbing strap can be woven in a reduced width, always corresponding to the pull-out force criteria dictated by safety standards.
• the safety strap according to the invention finds numerous applications both for braking in a substantially vertical plane and in a substantially horizontal plane, the aim being to absorb a shock after having connected the two strands (la) and ( lb) to a fixed and / or mobile structure.
• the woven safety strap according to the invention finds application in the safety harnesses used by people.
• One of the strands (la) is connected in this case, to a fixed part of a structure for example, while the other strand (lb) is connected to a part of the harness.

Landscapes

• Health & Medical Sciences (AREA)
• General Health & Medical Sciences (AREA)
• Business, Economics & Management (AREA)
• Emergency Management (AREA)
• Woven Fabrics (AREA)
• Emergency Lowering Means (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9504996

Family Applications (1)

Country Status (5)

Cited By (2)

Families Citing this family (12)

Family Cites Families (6)

• 1997
  • 1997-03-14 FR FR9703384A patent/FR2760648B1/fr not_active Expired - Lifetime
• 1998
  • 1998-03-05 DE DE69813736T patent/DE69813736T2/de not_active Expired - Fee Related
  • 1998-03-05 EP EP98913833A patent/EP0923403B1/de not_active Expired - Lifetime
  • 1998-03-05 AU AU68388/98A patent/AU6838898A/en not_active Abandoned
  • 1998-03-05 WO PCT/FR1998/000432 patent/WO1998041284A1/fr not_active Ceased

Non-Patent Citations (1)

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