WO1989004617A1 - Dispositif de blocage pour languette de ceintures de securite destinee a etre montee sur une courroie de la ceinture de securite - Google Patents

Dispositif de blocage pour languette de ceintures de securite destinee a etre montee sur une courroie de la ceinture de securite Download PDF

Info

Publication number
WO1989004617A1
WO1989004617A1 PCT/SE1988/000623 SE8800623W WO8904617A1 WO 1989004617 A1 WO1989004617 A1 WO 1989004617A1 SE 8800623 W SE8800623 W SE 8800623W WO 8904617 A1 WO8904617 A1 WO 8904617A1
Authority
WO
WIPO (PCT)
Prior art keywords
locking member
locking
tongue
axis
locking device
Prior art date
Application number
PCT/SE1988/000623
Other languages
English (en)
Inventor
Lennart Haglund
Original Assignee
Autoliv Development Aktiebolag
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 Autoliv Development Aktiebolag filed Critical Autoliv Development Aktiebolag
Publication of WO1989004617A1 publication Critical patent/WO1989004617A1/fr

Links

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
    • A44B11/25—Buckles; Similar fasteners for interconnecting straps or the like, e.g. for safety belts with two or more separable parts
    • A44B11/2503—Safety buckles
    • A44B11/2507—Safety buckles actuated by a push-button
    • A44B11/2523—Safety buckles actuated by a push-button acting parallel to the main plane of the buckle and in the same direction as the fastening action

Definitions

  • Locking device in safety belts for a tongue adapted to be mounted on a strap of the safety belt
  • the present invention relates to a locking device in safety belts for a tongue adapted to be mounted on a strap of the safety belt.
  • the locking device comprises a locking member adapted to be rotated around an axis between a release position, in which the locking member does not engage the tongue, and a locking position, in which the locking member engages and retains the tongue.
  • the locking device further comprises a latch member adapted to block the locking member in the locking position, and a movable operating member adapted to release the tongue when operated, so that the safety belt, can be unfastened.
  • the locking device is intended for use in safety belts for vehicles, particularly motor cars. Background Art
  • s Fig. 5 is a side view of the device shown in Fig. 3 with the axis of rotation of the locking member displaced. Best Mode for Carrying Out the Invention
  • the locking member 10 shown in Fig. 1 is mounted in a U-shaped support which forms the entrance path for the tongue and the sides of which form bearing means for the ends of the locking member.
  • Each support side is provided with an aperture into which one end of the locking member penetrates.
  • Only one side 11 of the U-shaped support with its bearing aperture 12 is shown in the figure, but the other side is designed in a corresponding way.
  • the side 11 is provided with a lug 13 which projects into the aperture 12 and which is provided with a bearing edge 14 for the locking member 10, as will be explained more in detail below.
  • three supporting means 9 for the tongue are indicated schematically.
  • the locking member 10 has substantially U-shape with twc side portions 15,16 on the upper side and a downwards projecting bearing portion 17 on the lower side.
  • the side portions 15,16 run along the full length of the locking member, but the bearing portion 17 only exists a * p ends of the locking member.
  • the side portion 15 is designed with a substanti lly cylindrical peripheral surface l c forming a contact surface for the tongue 1?.
  • Th** 3 side portion 16 is also designed with a substantially cylindrical peripheral surface 20.
  • the cylindrical peripheral surfaces 18,20 have substantially equal radii and the same centre axis A spaced from the axis of rotation B for the locking member and in parallel with said axis.
  • the aperture 12 Adjacent the side portions 15,16 of the locking member the aperture 12 has substantially arc-shaped edges with slightly larger radii than the side portions 15,16, so that a certain play exists between t e peripheral surfaces 18,20 of the side portions 15,16 ar_J the adjacent c iges of the aperture 12.
  • the downwards projecting bearing portion 1 " cf the locking member 10 forms a pocket 21 into which the bearing edge 14 ; . ' the iup _ _- "ar* project, se tha + the locking the locking member a*"*d which is spaced from the axis of rotation of the locking member, a force on the tongue in the direction of withdrawal of the tongue can give a resultant torque on the locking member towards the release position of the locking member.
  • the locking member can easily be rotated to the release position by means of the operating member to release the tongue, even if the tongue is heavily loaded in the direction of withdrawal.
  • the torque can be chosen so big that it prevails over the fractional forces appearing where the tongue abuts against the locking member, and possibly also over the forces appearing at the other contact surfaces of the locking member when absorbing the force from the tongue acting on the locking member.
  • the locking member can be made self opening , i. e. the locking member can be opened without any force transfer from the operating member to the locking member, as soon as the latch member hns been removed. This will facilitate the design of the operating member and, consequently, of the whole locking device .
  • Fig. 1 is a schematical view, partly in section, of a buckle having a rotatably mounted locking member with a fixed axis of rotation and a tongue retained by the locking member.
  • Fig. 2 is a schematical view of a movably mounted locking member and a tongue retained by the locking member.
  • Fig. 3 is a schematical side view of a locking member with a movable axis of rotation, a latch member, an operating member and a tongue retained by the locking member.
  • Fig. 4 is a plar, view of th*** 1 device shown in Fig. 3 . that the locking member cannot be moved to the release position by means of the operating member to release the tongue. This may occur, if the vehicle after an accident is upside down and a person is hanging in the safety belt. In such a case it may be necessary to lift the person, before the operating member can be operated to unfasten the safety belt. Normally, the cooperation of several persons is necessary for carrying out this work and the operation may be time consuming, due to the difficult working conditions when an accident has occurred. The alternative is to cut off the safety belt, but this operation requires a convenient tool which not always is at hand.
  • the person embraced by the safety belt must also quickly be released and removed from the vehicle, as the risk of fire is considerable in an accident of this type.
  • the safety belt can be unfastened in a normal way, even with a person hanging in the safety belt. This would also make it much easier for a person, who is not unconscious, to release himself from the safety belt and get out of the vehicle.
  • the locking member is mounted inside the contact surface for the tongue, a:-, seen in the direction of withdrawal of the tongue. This necessitates a hook-shaped locking member that canno* stand heavy tractive forces without further balancing. Such balancing further impedes the opening of the locking device. Disclosure of Invention
  • the main object of the invention is therefore to provide a locking device for the tongue in safety belts, which makes it possible to reliably unfasten the seat belt even when the safety belt is heavily loaded and, consequently, the tongue is subjected to a heavy force in the direction of withdrawal .
  • This object is achieved by giving the locking device the features set forth in the claims.
  • the locking member has a contact surface for the tongue, the perpendicular of which in the locking position of the locking member passes through a torque axis, which is parallel with the axis of rotation of member is rc atably mounted on the lug 13.
  • the bearing portion 17 nas a curved contact surface wi h a certain radius and a centre of curvature B which thus forms an axis of rotation for the locking member.
  • the bottom of the pocket 21 has a radius of curvature corresponding to the curvature of the contact surface of the bearing portion, so that the locking member can rotate on the bearing edge 14 with a friction as small as possible.
  • the locking member can be rotated between a locking position, which is shown in the figure and in which the tongue is retained by the locking member, and a release position, in which the locking member abuts against the top surface 22 of the lug and in which the tongue 19 is not retained by the locking member.
  • the aperture 12 in the side 11 is so dimensioned that the locking member can rotate on the bearing edge with a certain play to the edges of the aperture but cannot slip off the bearing edge. During the rotational movement the locking member rotates about its bearing axis B.
  • the centre A of the tongue contact surface 18 of the locking member is displaced from the centre B of the bearing surface provided on the lug 13 and is positioned a+ a distance a above the centre B.
  • the force exerted by Itie tongue 19 on the locking member 10 acts on the cylindrical contact surface 18 of the locking member and can be divided into two components, one of which being directed radially along the perpendicular N through the centre A of the contact surface and the other being directed tangential ]y along the contact surface*.
  • the radial force will cause a torque tending to turn the locking member counter-clockwise from the indicated locking position towards the release position . If the tongue abut:- against the locking member below the centre A, the tangential force will be directed downwards, and if the tongue abuts against the locking member abcve the centre A, th* ⁇ * tangential force will be directed upwards.
  • the tangential force can counteract or cooperate with the torque caused by the radial force, depending on the vertical position of the tongue. It is desirable to cause a torque on the locking member directed from the locking position towards the release position, i. e.
  • the tongue should abut against the locking member on a level with or above the centre A, so that the tangential force not substantially counteracts the desired torque on the locking member directed against the release position of the locking member.
  • a desired torque on the locking member can be obtained, as the torque depends upon the distance between the centre A and the centre B and the force component at centre A perpendicular to the line connecting centre A with centre B.
  • the line running through the centre A in parallel with the axis of rotation B of the locking member can be regarded as a torque axis for the locking member.
  • a suitable torque in the release direction of the locking member can be obtained.
  • This torque can be changed within wide limits from a low value close to 0 to a very large value, particularly if the tangential force on the locking member cooperates with the torque caused by the radial force. If the distance between the centres A and B is small, a small torque is obtained. Then, only some help from the load on the tongue is obtained for rotating the locking member to the release position, and the major portion of the opening force must still be transferred from the operating member.
  • the frictional force at the contact surface between the tongue and the locking member can be completely or partly compensated, and by an even larger distance the locking member can be made self-opening, so that no action from the operating member is required to rotate the locking member to the release position, when the latch member has been removed.
  • FIG. 2 shows a slightly modified embodiment of the device shown in Fig. 1.
  • the locking member 23 is mounted on a slanting, plane surface 24 and will therfore be somewhat displaced on this surface, when the tongue 19 is loaded in the direction U of withdrawal.
  • the axis of rotation of the locking member 23 will be formed by the top edge B of the plane surface, and when the tongue is loaded the cylindrical surface 26 of the locking member will be brought into contact with the edge of the aperture 12 which edge thus will act as a load carrying surface. Therefore, the edge of the aperture 12 and the cylindrical surface 26 should be so designed that a large contact surface is obtained, as shown in Fig. 2. This can easily be achieved, if the rvlindrical surface 26 has a centre axis C displaced from the centre axis A of the cylindrical surface 25.
  • Figures 3 and 4 also show an embodiment slightly modi fied with respect to the embodiment shown in Fig. 1.
  • Th" lug 27 projecting into the aperture 12 is so arranged and designed that it yields when the locking member is heavily loaded in the direction U of withdrawal, e. g. in a collision.
  • the cylindrical perpheral surface 20 on the side portion 16 of the locking member 10 will then engage with the edge of the aperture 12.
  • this edge has a curvature corresponding to the curvature of the side portion 16.
  • the edge of the aperture has a radius oL ' curvature which is substantially as long as the radius of curvature of the side portion 16, but has an other centre D.
  • Th" side portion 16 can then have its centre in an axis through the centre A.
  • the locking member normally, i. e. when the locking member ha:: r. ⁇ he*-*, exposed o a load cf the size appearing for example in a collision, will turn with a very low friction around the bearing edge 28 of the lug 27 but in case of a very heavy load is forced into contact with an edge in the aperture, so that said edge will carry the load appearing on the locking member.
  • Fig. 5 also a latch member 29 for the locking member 10 and an operating member 30 to release the tongue have been indicated schematically.
  • the latch member 29 is connected with the locking member 10 and, consequently, moves together with the locking member.
  • the latch member is furthermore spring operated in the locking direction of the locking member, i. e.
  • the operating member 30 is provided with a contact surface 31 for the latch member, so that the latch member cannot be turned in the opening direction of the locking member, as long as the operating member is in the locking position, as shown in the figure.
  • the contact surface 31 for the latch member 29 is moved, so that the latch member and consequently also the locking member can be turned in the opening direction nf the locking member.
  • the latch member and the locking member are turned by the operating member by means cf a control surface (not shown) on the operating member.
  • a special advantage can be achieved in the embodiment according to Fig. 3. If the yielding lug is so designed that it only yields for tra * lent forces and loads appearing in accidents, e. g. collisions, and then rebounds, when thes ⁇ forces and loads have ceased, it is possible to achieve that the locking member is self-opening at normal or slightly higher loads. It is then possible to easily unfasten the safety belt by means of the operating member, even if the vehicle after a collision is upside down and a person hangs in the safety belt. The load from a person hanging in the safety belt is not at all as high as the load arising in a collision. The frictional force arising when the locking member is moved into contact with a force carrying surface, e. g. as shown in Fig.
  • the locking means may be designed in many ways and the cylindrical surfaces may have the same or different radii and the same or different centres.
  • the contact surface for the tongue does not need to be cylindrical but can have any shape, e. g. plane, provided that the perpendicular or perpendiculars of the surface passes at the side of the axis of rotation of the locking member, so that a torque towards the release position of the locking member acts on the locking member, when the tongue is loaded.
  • the locking member may be mounted on a bearing edge designed or positioned in another way than shown and possibly be mounted on a shaft which may be resilient or have sufficien + strength r- * - take up the arising, loads.
  • the locking member may also be arranged in such a way that it has to be rotated In the opposite direction, i. e. clockwise, to reach its release position. The torque axis will then be positioned below the axis of rotation of the locking member.

Landscapes

  • Emergency Lowering Means (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Seats For Vehicles (AREA)

Abstract

Un dispositif de blocage pour languette de ceintures de sécurité comprend un élément de blocage (10) destiné à tourner autour d'un axe (B) entre une position de détachement et une position de blocage. Le dispositif de blocage comprend également un élément de verrouillage (29) pour l'élément de blocage et un élément d'actionnement mobile (30) servant à détacher la languette. L'élément de blocage (10) comporte une surface de contact pour la languette (19), dont la perpendiculaire (N) dans la position de blocage de l'élément de blocage traverse un axe de couple (A) qui est parallèle à l'axe de rotation (B) de l'élément de blocage et qui est situé de sorte qu'une force s'exerçant sur la languette (19) dans la direction (U) de retrait de languette produit un couple résultant (M) sur l'élément de blocage vers la position de détachement de l'élément de blocage, ce qui facilite le détachement de la languette lorsque la ceinture de sécurité est tendue. L'axe de rotation (B) de l'élément de blocage est situé à l'extérieur de la surface de contact de l'élément de blocage, lorsqu'on se place dans la direction (U) de retrait de la languette. L'élément de blocage peut être monté sur un ergot résilient (27), qui fléchit lorsque la ceinture de sécurité est très fortement tendue, comme c'est le cas d'une collision, pour que l'élément de blocage puisse alors se bloquer automatiquement.
PCT/SE1988/000623 1987-11-17 1988-11-17 Dispositif de blocage pour languette de ceintures de securite destinee a etre montee sur une courroie de la ceinture de securite WO1989004617A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8704511-8 1987-11-17
SE8704511A SE460009B (sv) 1987-11-17 1987-11-17 Laasanordning vid saekerhetsselar

Publications (1)

Publication Number Publication Date
WO1989004617A1 true WO1989004617A1 (fr) 1989-06-01

Family

ID=20370262

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1988/000623 WO1989004617A1 (fr) 1987-11-17 1988-11-17 Dispositif de blocage pour languette de ceintures de securite destinee a etre montee sur une courroie de la ceinture de securite

Country Status (3)

Country Link
AU (1) AU2784689A (fr)
SE (1) SE460009B (fr)
WO (1) WO1989004617A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE447331B (sv) * 1980-07-31 1986-11-10 Gote Eskil Yngve Holmberg Las till bilbelten
EP0262508A1 (fr) * 1986-09-16 1988-04-06 Allied Engineering Company S.A. Boucle pour ceinture de sécurité

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE447331B (sv) * 1980-07-31 1986-11-10 Gote Eskil Yngve Holmberg Las till bilbelten
EP0262508A1 (fr) * 1986-09-16 1988-04-06 Allied Engineering Company S.A. Boucle pour ceinture de sécurité

Also Published As

Publication number Publication date
SE460009B (sv) 1989-09-04
AU2784689A (en) 1989-06-14
SE8704511D0 (sv) 1987-11-17
SE8704511L (sv) 1989-05-18

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