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WO1982003991A1 - Mecanisme de verrouillage pour des ceintures de securite - Google Patents

Mecanisme de verrouillage pour des ceintures de securite Download PDF

Info

Publication number
WO1982003991A1
WO1982003991A1 PCT/SE1982/000181 SE8200181W WO8203991A1 WO 1982003991 A1 WO1982003991 A1 WO 1982003991A1 SE 8200181 W SE8200181 W SE 8200181W WO 8203991 A1 WO8203991 A1 WO 8203991A1
Authority
WO
WIPO (PCT)
Prior art keywords
latch
locking
plate
teeth
ratchet
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.)
Ceased
Application number
PCT/SE1982/000181
Other languages
English (en)
Inventor
Transport Inter Dev Ab Safety
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.)
Safety Transport International Development AB
Original Assignee
Safety Transport International Development AB
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 Safety Transport International Development AB filed Critical Safety Transport International Development AB
Priority to AU84568/82A priority Critical patent/AU8456882A/en
Publication of WO1982003991A1 publication Critical patent/WO1982003991A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R22/00—Safety belts or body harnesses in vehicles
    • B60R22/34—Belt retractors, e.g. reels
    • B60R22/36—Belt retractors, e.g. reels self-locking in an emergency
    • B60R22/405—Belt retractors, e.g. reels self-locking in an emergency responsive to belt movement and vehicle movement

Definitions

  • the present invention relates to a latch mechanism of the kind referred to in the preamble of the accom- panying claim 1.
  • the Swedish patent specification 7315301-7 describes a latch mechanism with a latch plate pivotably suspended on an edged portion of the roll-up shaft.
  • This solution presents the drawback that the latch teeth of the latch plate can .get caught on the crests of the stationary latch teeth, no complete latch engagement thus being obtained.
  • the un ⁇ completed latch engagement may be released by a heavy load and the safety belt may yield over a distance before latch engagement is again obtained, which may cause body injuries to the belt user.
  • a latch engagement may cause deformation of the tooth crests resulting in an ever increasing tendency of un ⁇ completed engagement.
  • the purpose of the present invention is to provide a latch mechanism which secures a complete latch engage ⁇ ment.
  • FIG. 1 shows, partly in sectional view, a roll-up mechanism for safety belts
  • FIG. 2 is a cross-sectional view of the roll-up mechanism with a latch mechanism according to the present invention in releasing position
  • FIG. 3 is a corresponding cross-sectional view of the latch mechanism in latching position.
  • a roll-up mechanism 1 for safety belts comprises substantially a strap roller 2 to which one end of the strap 3 -of the safety belt is connected.
  • the strap roller * is rotatably 5 mounted in two end pieces 4, 5 and is adapted to roll up and roll off, respect vely, the belt strap under the influence of a roll-up spring ⁇ incorporated into one end piece 4.
  • a latch mechanism according to the invention, the
  • the latch mechanism comprises substantially an activat ⁇ ing means 7 and a latch mechanism 8 to be actuated by said activating means, v/hich is adapted to latch the strap roller against withdrawal of the belt strap under
  • the activating means according to the invention is an automatically operating mechanism .actuated by inertia forces, which will be described, in more detail below.
  • the latch mechanism 8 comprises a latch 10 mounted for pivotal moveme ⁇ -t in a joint 9, and
  • ratchet 11 which is fragmentar ly indicated by dot and dash lines in FIG. 2.
  • the ratchet 11 is circular and rotationally symmetric and has a plurality of latch teeth 12 distributed over the entire periphery.
  • the latch is adapted to co-operate with the ratchet 11 so as to latch
  • the latch mechanism 8 is
  • a mechanism constructed such that the ratchet 12 shown is arranged to initiate a second mechanism, relieving the latch 10, which is adapted to take up stresses in the belt strap.
  • a mechanism can be arranged e.g. in such a way that it is initiated also by the acceleration forces in the
  • OMH strap by the arrangement of a latch plate 13 eccentrically suspended on a portion 15 of the shaft of the strap roller.
  • the activating means 7 thus is arranged to sense the speed change of the vehicle and to adjust the latch 10 from releasing position to latching position at unnormal changes.
  • the construction of said means is known and the description thereof has been excluded for the sake of clar ty.
  • the latch plate 13 forms an opening 14 through which said portion 15 of the roll-up shaft of the roll-up mechanism extends. This portion 15 of the roll-up shaft accordingly projects beyond one mounting position of the strap roller 2 in the end piece 5.
  • the shaft portion 15 has two flat parallel edge surfaces 15, 17 which are each intended to co-operate wfth one 'straight edge portion 18, 19 of -.the opening 14 in the latch plate 13. These two edge portions 18, 19 include an acute angle.
  • the opening 14 has two further opposite edge portions 20, 21 which in the embodiment shown are parallel with each other but of different lengths such that the opening has the shape of a trapezoid.
  • the shaft portion 15 has two curved portions 22, 23 one of which is intended for co-operation with the edge portion 20 by rolling contact while the other portion is intended for co-operation with the edge portion 21 by sliding. Some small play is maintained in practice between the shaft portion and said edge portions 20, 21 such that there is obtained in practice contact with one of the curved portions of the shaft portion namely; the .. port on which for the ti e being is turned upwards.
  • the latch plate 13 thus is pivotally mounted on the shaft portion 15 and is suspended therefrom by means of the opening 14 and is arranged to oscillate between two positions, one releasing position shown in FIG. 2 with the. edge portion 18 engaging, the edge surface 16 of the shaft portion, and a latching portion according to FIG.
  • the opening 14 is eccentrically located in the latch plate 13 in order that a major mass of the latch plate shall be located at one side of the opening, facing a portion of the latch plate which forms an engagement portion 24 with four latch teeth 25. These teeth, are adapted to engage, in the latch position of the mech ⁇ anism, stationary inwardly facing latch teeth 26 of a stationary latch ring 27 which is fixedly mounted to the end piece 5.
  • the latch plate 13 is made of a relatively heavy material, e.g. metal with no tendency of deformation, by stamping from a sheet blank.
  • the latch plate 13 is mounted by contact with a sheet metal end wall in the end piece 5, the latch ring 27 also being made of a metal material preferably by stamping from a sheet blank.
  • a countersink is thus formed inwardly of the latch ring 27 in a substantially circular space 28 with flat bottom wherein the latch plate 13 is allowed to rotate together with the shaft portion 15 and to oscillate between releasing position and latching position.
  • the latch plate 13 has a latch 29 pivotally connected therevnth, which is biased by means of a spring 30 such that the latch tends to take the releasing position according to FIG. 2.
  • the spring 30 in the embodiment shown comprises a wire spring which is attached at one end thereof to a pin 31 on the shaft portion .15 and at the other end thereof at an angled portion 32 in a bore in the latch 29.
  • the spring - is attached to the latch 29 spaced from the bearing pin 33 of the latch, said bearing pin projecting into a
  • the latch 29 can be made of a folded metal sheet which thus extends with two portions one on each side of the latch plate.
  • the .ratchet 11 described above which co-operates with the latch 10 of the activating means 7, is made e.g of plastics as is the. atch 10, because these two elements as well as the latch 29 need not take up heavy loads occurring in the belt strap 3 at great speed changes of the vehicle.
  • the ratchet 11 as well as the latch plate 13 also must- have some inertia and therefore the ratchet preferably is provi-ded with a weight-increasing metal plate or the like, not shown, which can be mounted to the ratchet.
  • the ratchet 11 has a stud 35 which projects inwardly into the space 28 for the latch plate 13, said stud being shown in cros.s section taken such that the ratchet 11 is not shown in the views of FIGS. 2 and 3 ' ; for the ' sake of clarity the ratchet is indicated f agmentari ly only by dot and dash lines.
  • the ratchet 11 can be rotatably mounted to the shaft pin 31 or on a pin projecting in the opposite direction from a wall of a cap on the end piece 5.
  • the extension of the strap 3 is indicated in FIGS. 2 and 3 by a dot and dash line.
  • the direction for withdrawal of the strap is indicated in FIG. 2 by an arrow 40. Accordingly, the withdrawal takes place against the bias of the roll-up spring which provides a rota ⁇ tional force in counter-clockwise direction on the shaft portion 15.
  • the latch plate also forms a recess 36 with an abutment edge 37, the adjustment stud 35 being arranged to co-operate with said edge at rotation of the strap roller and thus of the latch plate 13 in a direction opposite to the arrow 38 according to FIG. 2, i.e. in the roll-up direction and also under ordinary driving
  • the latch 29 has a guide edge 39 which is angled and is adapted to co-operate with the adjustment stud 35 in order to adjust the latch to the latching position in a manner which will be described in more detail below.
  • the latch mechanism also preferably includes a spring which acts on the latch plate 13 and is engaged e.g. between the ratchet 11 and the latch plate 13 in order to keep the latch plate in the releas ⁇ ing pos . ition of FIG. 2 when the strap roller is at rest or is moving slowly.
  • the activating means 7 When the vehicle is at rest in a normal position and when normal speed changes of the vehicle occur, the activating means 7 is in the position shown in FIG. 2, wherein the latch 10 is pivoted to a lower releasing position spaced from the latch teeth 12 of the ratchet 11. Then, said ratchet is allowed “ to follow the rota ⁇ tion of the latch plate in a direction opposite to the arrow 38 by the engagement of the adjustment stud 35 with the abutment edge 37 of the latch plate. Moreover, ' the ratchet 11 will follow the rotational movements of the latch plate also in the direction of the arrow 38 at normal acceleration movements of the belt strap 3. This is achieved e.g. by the ratchet 11 and the latch plate 13 being interconnected by means of a spring as mentioned above.
  • the belt strap 3 is allowed to be pulled out from the roll-up ⁇ echanism 1 and to be pulled in by being rolled up, respectively.
  • the adjustment stud 37 will leave the position shown in FIG. 2 and will engage the guide edge 39 of the latch 29, said latch being displaced outwards against the bias of the spring 30 thereof to
  • OMPI WIPO engage one of the latch teeth 26 of the latch ring 27.
  • the latch p-late 13 oscillates from the releasing position shown in FIG. 2 to the latching posi ⁇ tion shown in FIG. 3 with the engagement pOrtion 24 thereof engaging the latch teeth 26 of the latch ring 27, the strap roller being prevented from rotation in the direction of the arrow 38 and the belt strap thus being prevented from withdrawal.
  • the relative movements descri bed above according to the invention take - place due to two prerequisites, viz. that either the activating means 7 is being activated and thus the latch 10 is being brought to block the ratchet 11 against rotation in the direction of the arrow 38, o r that the belt strap 3 is being withdrawn with a strap acceleration exceeding a pre ⁇ determined value.
  • T-he activating means 7 is activated at unnormal speed changes of the vehicle, the ratchet thus being stopped and the adjustment stud 35 being held stationary which provides said relative movement when the latch plate 13 rotates together with the shaft portion 15 in the direction of the arrow 38.
  • OMPI adjustment of the latch plate takes place in a proper manner such that the latch -teeth 25 of the engagement portion 24 penetrate completely into the spaces between the latch teeth 26 of the latch rtng 27 so that the latch teeth of the latch plate do not get caught on the crests of the latch teeth of the latch ring.
  • This provides an uncompleted latch engagement and at heavy load the risk that the engagement is lost and that the belt strap is withdrawn further over a distance before a proper engagement is obtained.
  • This is guaranteed by the fact that the other end of the latch 29 in the latching position is located in a position in relation to the latch teeth 25 of the engagement portion, which is chosen geometrically such that the latch plate is guided to the proper position.
  • This proper positioning comprises a spacing along the periphery of the latch ring 27 between the tooth crests of the latch teeth 25 of the engagement portion- 24 and the outer end of the latch 29 which is a multiple of the spacing of the latch teeth.
  • FIG. 3 is intended to show particularly the case wherein activation takes place due to unnormal speed changes of the vehicle, because the activating means 7 is activated and the latch 10 .of the activating means is adjusted to latching position in engagement with the ratchet 11. In practice, this occurs most often at the same occasion but with a time delay such that the activating means reacts first.
  • the change of movement of the ratchet 11 in relation to the latch plate 13 can be communicated in another way such that the latch 29 is activated.
  • the opening 14 and the shaft portion 15 can be formed in several different ways in order to allow said oscillating movement of the latch plate and simulta- neously initiate that the latch plate is carried on by the rotational movement of the strap roller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Automotive Seat Belt Assembly (AREA)
  • Buckles (AREA)
  • Clamps And Clips (AREA)

Abstract

Mecanisme de verrouillage pour des ceintures de securite du type a enrouleur, destine principalement a des vehicules et comprenant une courroie (3) qui peut etre retiree d'un mecanisme a enroulement (1) contre la force de rappel d'un ressort. Ce mecanisme d'enroulement comprend un enrouleur de courroie (2) pouvant tourner autour d'un arbre d'enroulement, un mecanisme de verrouillage (8) comprenant une roue dentee (11) et un verrouillage (10) pouvant etre regle, en fonction des changements normaux de vitesse, entre une position de liberation de l'enrouleur de courroie et une position de verrouillage. Le mecanisme de verrouillage comprend une plaque de verrouillage (3) pourvue d'une partie d'engagement (25) pouvant etre reglee entre une position de verrouillage en prise avec des dents de verrouillage (26) d'une bague de verrouillage stationnaire (27) et une position de liberation dependant des changements anormaux de vitesse du vehicule ainsi que d'une acceleration anormale dans le retrait de la courroie. Un deuxieme verrouillage (29) est monte de maniere pivotante sur la plaque de verrouillage (13) et est soumis a une force de rappel qui tend a maintenir le verrouillage dans une position de liberation. Un element de reglage (35) ajuste le verrouillage sur la plaque de verrouillage d'une position de liberation en une position de verrouillage lors d, un mouvement relatif de la roue dentee (11) et de la plaque de verrouillage (13). Ce verrouillage est concu de maniere a guider, par son reglage dans une position de verrouillage, les dents de verrouillage (25) de la partie d'engagement de la plaque de verrouillage jusqu'a une prise complete avec les dents de verrouillage (26) de la bague de verrouillage.
PCT/SE1982/000181 1981-05-22 1982-05-19 Mecanisme de verrouillage pour des ceintures de securite Ceased WO1982003991A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU84568/82A AU8456882A (en) 1981-05-22 1982-05-19 A latch mechanism for safety belts

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8103237A SE8103237L (sv) 1981-05-22 1981-05-22 Sperranordning till sekerhetsbelten
SE8103237810522 1981-05-22

Publications (1)

Publication Number Publication Date
WO1982003991A1 true WO1982003991A1 (fr) 1982-11-25

Family

ID=20343904

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1982/000181 Ceased WO1982003991A1 (fr) 1981-05-22 1982-05-19 Mecanisme de verrouillage pour des ceintures de securite

Country Status (5)

Country Link
EP (1) EP0079368A1 (fr)
AU (1) AU8456882A (fr)
DE (1) DE3246032T1 (fr)
SE (1) SE8103237L (fr)
WO (1) WO1982003991A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4749144A (en) * 1985-07-22 1988-06-07 Ashimori Kogyo Kabushiki Kaisha Emergency locking retractor for seat belts
DE3809829A1 (de) * 1988-03-23 1989-10-05 Autoflug Gmbh Sicherheitsgurtaufroller mit strammvorrichtung
US5039025A (en) * 1989-02-16 1991-08-13 European Components Corporation Safety belt mechanism
US6305633B1 (en) * 1999-04-09 2001-10-23 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing take-up device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10304943B3 (de) * 2003-02-06 2004-08-19 Autoliv Development Ab Endbeschlagstraffer

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3552676A (en) * 1968-03-01 1971-01-05 Georges Robert Weber Emergency locking rotractor for safety belt
SE387243B (sv) * 1973-11-12 1976-09-06 Instrument Verken Ab Anordning for lasning av en axel vid en spole for upplindning av ett sekerhetsbelte av rulltyp
US4044969A (en) * 1974-12-23 1977-08-30 Granges Essem Aktiebolag Locking mechanism for vehicle safety belts
DE2817214A1 (de) * 1978-04-20 1979-10-31 Autoflug Gmbh Gurtaufroller mit automatischer blockierung fuer kraftfahrzeug-sicherheitsgurte
DE2826286A1 (de) * 1978-06-15 1979-12-20 Repa Feinstanzwerk Gmbh Sicherheitsgurtaufrollautomat
DE2915750A1 (de) * 1979-04-19 1981-03-19 Autoflug Gmbh, 2084 Rellingen Selbstsperrender gurtaufroller fuer sicherheitsgurte

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1221846A (en) * 1968-06-27 1971-02-10 Kangol Magnet Ltd Improvements in or relating to inertia reel mechanisms

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3552676A (en) * 1968-03-01 1971-01-05 Georges Robert Weber Emergency locking rotractor for safety belt
SE387243B (sv) * 1973-11-12 1976-09-06 Instrument Verken Ab Anordning for lasning av en axel vid en spole for upplindning av ett sekerhetsbelte av rulltyp
US4044969A (en) * 1974-12-23 1977-08-30 Granges Essem Aktiebolag Locking mechanism for vehicle safety belts
DE2817214A1 (de) * 1978-04-20 1979-10-31 Autoflug Gmbh Gurtaufroller mit automatischer blockierung fuer kraftfahrzeug-sicherheitsgurte
DE2826286A1 (de) * 1978-06-15 1979-12-20 Repa Feinstanzwerk Gmbh Sicherheitsgurtaufrollautomat
DE2915750A1 (de) * 1979-04-19 1981-03-19 Autoflug Gmbh, 2084 Rellingen Selbstsperrender gurtaufroller fuer sicherheitsgurte

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4749144A (en) * 1985-07-22 1988-06-07 Ashimori Kogyo Kabushiki Kaisha Emergency locking retractor for seat belts
DE3809829A1 (de) * 1988-03-23 1989-10-05 Autoflug Gmbh Sicherheitsgurtaufroller mit strammvorrichtung
US5039025A (en) * 1989-02-16 1991-08-13 European Components Corporation Safety belt mechanism
US6305633B1 (en) * 1999-04-09 2001-10-23 Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho Webbing take-up device

Also Published As

Publication number Publication date
EP0079368A1 (fr) 1983-05-25
AU8456882A (en) 1982-12-07
SE8103237L (sv) 1982-11-23
DE3246032T1 (de) 1984-09-20

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