JPS5837407Y2 - Lock mechanism of seat belt retractor - Google Patents
Lock mechanism of seat belt retractorInfo
- Publication number
- JPS5837407Y2 JPS5837407Y2 JP8933878U JP8933878U JPS5837407Y2 JP S5837407 Y2 JPS5837407 Y2 JP S5837407Y2 JP 8933878 U JP8933878 U JP 8933878U JP 8933878 U JP8933878 U JP 8933878U JP S5837407 Y2 JPS5837407 Y2 JP S5837407Y2
- Authority
- JP
- Japan
- Prior art keywords
- lock
- shaft
- gear
- claw member
- ratchet gear
- 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.)
- Expired
Links
Landscapes
- Automotive Seat Belt Assembly (AREA)
Description
【考案の詳細な説明】
本考案はシートベルト用巻取装置のロック機構の改良に
関する。[Detailed Description of the Invention] The present invention relates to an improvement in the locking mechanism of a seat belt retractor.
シートベルト用巻取装置におけるロック機構は良く知ら
れている。Locking mechanisms for seatbelt retractors are well known.
このロック機構の多くは巻取軸に一体的に設けられた歯
車に対し、ベースに回動可能に設けられたロック爪部材
を倒し込んで巻取軸のウェビング引出し方向の回転を阻
止する様にしたものである。Most of these locking mechanisms have a mechanism in which a lock claw member rotatably provided on the base is pushed down against a gear integrally provided on the take-up shaft to prevent the take-up shaft from rotating in the direction of pulling out the webbing. This is what I did.
今、緊急ロック機構を有する安全ベルト巻取装簿の一例
について第１図により説明する。An example of a safety belt retractor having an emergency locking mechanism will now be described with reference to FIG.
第１図において、安全ベルト巻取装置のベース１にはそ
れと一体の側板２，３が形成されており、そこに巻取軸
４が回転可能に取付けられている。In FIG. 1, a base 1 of a safety belt retractor has side plates 2 and 3 integrally formed therewith, and a retractor shaft 4 is rotatably attached thereto.
巻取軸４は図示なき巻取ばねにより巻取方向に付勢され
ており、ウェビング６を巻付けている。The take-up shaft 4 is biased in the take-up direction by a take-up spring (not shown), and the webbing 6 is wound around the take-up shaft 4.
巻取軸にはそれと一体にラチェット歯車７が取付けられ
ている。A ratchet gear 7 is integrally attached to the winding shaft.
ラチェット歯車７の外周よりも外側部に相応する部分に
ロック爪部材９がベース側板２，３に穿設された扇状孔
１０内に回動可能に支持されている。A lock claw member 9 is rotatably supported in a fan-shaped hole 10 bored in the base side plates 2 and 3 at a portion corresponding to the outer side of the outer periphery of the ratchet gear 7.
ロック爪部材９は図示の回動位置にある時はラチェット
歯車７と非かみ合いであるが、後述の態様により上向き
に回動するとラチェット歯車とかみ合ってウェビング引
出し方向の回転を停止する。When the lock pawl member 9 is in the illustrated rotational position, it does not engage with the ratchet gear 7, but when it rotates upward in a manner described later, it engages with the ratchet gear and stops rotation in the webbing drawing direction.
ロック爪部材９の下方にはベース１から支持部材１２が
突出しており、そこに振子１３が吊り下げである。A support member 12 protrudes from the base 1 below the lock claw member 9, and a pendulum 13 is suspended from the support member 12.
振子１３は上端に皿部１４を有しており、そこにロック
爪部材９の下方突起９ａが載置されている。The pendulum 13 has a plate portion 14 at its upper end, on which the lower protrusion 9a of the lock claw member 9 is placed.
振子１３は通常図示の位置にあるが、車体に急ブレーキ
等により所定値以上の速度変化があると傾いてロック爪
部材９を回動させてラチェット歯車７にかみ合せてウェ
ビングの引き出しをロックする。The pendulum 13 is normally in the position shown in the figure, but if the speed of the vehicle body changes by more than a predetermined value due to sudden braking, etc., it tilts and rotates the lock pawl member 9 to engage the ratchet gear 7 and lock the webbing drawer. .
第２図は従来のラチェット歯車とロック爪部材の爪とを
拡大して、そのかみ合いの状態を示している。FIG. 2 is an enlarged view of the conventional ratchet gear and the pawl of the lock pawl member, showing their meshing state.
従来装置においてラチェット歯車の各歯１５のかみ合い
面１５ ａがその歯元１５ｂを通る歯元円１８の接線１
９に対してなす角αは鈍角又は第２図の如く直角に形成
されており、それにかみ合うロック爪部材９の爪部９ｂ
はロック爪部材に対し傾斜面として形成されている。In the conventional device, the tangent 1 of the dedendum circle 18 through which the meshing surface 15a of each tooth 15 of the ratchet gear passes through its dedendum 15b.
The angle α formed with respect to the locking claw member 9 is an obtuse angle or a right angle as shown in FIG.
is formed as an inclined surface with respect to the lock pawl member.
この様なかみ合い面の場合、巻取軸側からロツり爪部材
へと作用する力が第２図矢印穴の方向に働くためロック
爪部材を倒し込む方向の分力が生じ、そのためかみ合い
は確実になるが、ロック爪部材がねじられる様な力を受
けるという欠点がある。In the case of such a mating surface, the force acting from the take-up shaft side to the locking pawl member acts in the direction of the arrow hole in Figure 2, so a component force is generated in the direction of tilting the locking pawl member, and therefore the engagement is reliable. However, there is a drawback that the lock claw member is subjected to a twisting force.
さらに、かみ合いが外れるためにはラチェット歯車が若
干戻り方向に回転しなければならない。Additionally, the ratchet gear must rotate slightly in the return direction to disengage.
しかるに、安全ベルトの巻取装置の小型化の要請ととも
にドア等の可動部分に取付ける必要があるが、その様な
場合ロック爪部材の解除機構が複雑になり誤動作が起り
がちである。However, with the demand for smaller safety belt retractors, it is necessary to attach them to movable parts such as doors, but in such a case, the lock pawl member release mechanism becomes complicated and malfunctions are likely to occur.
そこで、本考案は緊急時等の所望のロック状態において
、耐えうる荷重が減少することなく、シがもロック状態
の解除が容易でありがつ小型化できるロック機構を提供
することを目的とする。Therefore, the object of the present invention is to provide a locking mechanism that can be easily released from the locked state without reducing the withstand load in a desired locked state such as in an emergency, and can be made smaller. .
以下に第３図、第４図を参照して本考案の一実施例につ
いて説明する。An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.
第３図に示す様に、ラチェット歯車の各歯１５は、その
かみ合い面１５ ａが歯元円１８を通る接線に対してな
す角αが鋭角とされている。As shown in FIG. 3, each tooth 15 of the ratchet gear has an acute angle α that its meshing surface 15a makes with a tangent passing through the dedendum circle 18.
一方、ロック爪部材９はその一端の回りに回動可能とさ
れ、先端部の一方の角部は、半径の小さな湾曲部２２と
されている。On the other hand, the lock claw member 9 is rotatable around one end thereof, and one corner of the tip is formed into a curved portion 22 with a small radius.
従って、ロック爪部材９が歯１５のがみ合い面１５ ａ
にかみ合った際にロック爪部材９とかみ合い面１５ａと
が確実にかみ合うことになる。Therefore, the lock pawl member 9 engages the engagement surface 15a of the tooth 15.
When engaged, the lock claw member 9 and the engagement surface 15a will surely engage.
これに対して仮に湾曲部２２が形成されていなければ、
両者間にすきまができて、密着しない。On the other hand, if the curved portion 22 is not formed,
There will be a gap between the two and they won't stick together.
またかみ合い時にロック爪部材９に加わる力は、第３図
中央部Ｂで示すように、ロック爪部材９の回動中心を通
る。Further, the force applied to the lock pawl member 9 during engagement passes through the center of rotation of the lock pawl member 9, as shown in the center portion B of FIG.
そのため、ロック爪部材９の元位置への復帰が容易とな
りしかも緊急時に耐える強度も減少しないことが判明し
ている。Therefore, it has been found that the lock claw member 9 can be easily returned to its original position, and the strength withstanding an emergency does not decrease.
又、ロック爪部材９にねじれ方向の力がかからないため
に、ロック爪部材９の爪の断面を小さくすることができ
、装置全体を小型にできる。Further, since no torsional force is applied to the lock claw member 9, the cross section of the claw of the lock claw member 9 can be made small, and the entire device can be made compact.
なお、ラチェット歯車の各歯１５のがみ合い面１５ ａ
が、その歯元を通る歯元円１８の接線１９に対してなす
角αを鋭角としであることはまた、ロック爪部材９をラ
チェット歯車の外周よりも外に設置できるメリットがあ
る。In addition, the meshing surface 15 a of each tooth 15 of the ratchet gear
However, the fact that the angle α formed with the tangent 19 of the dedendum circle 18 passing through the dedendum is an acute angle also has the advantage that the lock pawl member 9 can be installed outside the outer periphery of the ratchet gear.
第４図は本考案を緊急ロック機構に採用した一例の概略
図である。FIG. 4 is a schematic diagram of an example in which the present invention is adopted as an emergency locking mechanism.
構造、作用は第１図と同様であるため説明を省略する。Since the structure and operation are the same as those in FIG. 1, the explanation will be omitted.
第１図は従来の緊急ロック機構を備えた巻取装置の斜視
図、第２図はその一部拡大図、第３図は本考案の一実施
例の部分説明図、第４図は本考案の実施例を採用した巻
取装置の概略的説明図である。
主要部分の符号の説明 ４・・・・・・巻取軸、７・・
・・・・ラチェット歯車、９・・・・・・ロック爪部材
、１５ ａ・・・・・・ラチェット歯車のかみ合い面、
９ｂ・・・・・・爪部。Fig. 1 is a perspective view of a winding device equipped with a conventional emergency locking mechanism, Fig. 2 is a partially enlarged view thereof, Fig. 3 is a partial explanatory view of an embodiment of the present invention, and Fig. 4 is a perspective view of a winding device equipped with a conventional emergency lock mechanism. FIG. 2 is a schematic explanatory diagram of a winding device employing an embodiment of the present invention. Explanation of symbols of main parts 4... Winding shaft, 7...
... Ratchet gear, 9... Lock claw member, 15 a... Ratchet gear meshing surface,
9b...Claw portion.
Claims (1)
車に対しかみ合い位置と非かみ合い位置との間を回動可
能であり、該歯車にかみ合った時に前記ウェビング巻取
軸のウェビング引出し方向の回転を阻止するためのロッ
ク爪部材を有するシートベルト用巻取装置において、 前記ラチェット歯車の歯元円を通る接線とかみ合い面と
のなす角度が鋭角とされるとともに、ロック爪部材の先
端部の角部は半径の小さな湾曲部とされており、かつ該
ロック爪部材が歯車のかみ合い面とかみ合った際、前記
ウェビング巻取軸からの荷重の向きが、ロック爪部材の
回動中心を通るように形成されていることを特徴とする
シートベルト用巻取装置のロック機構。[Claims for Utility Model Registration] A ratchet gear provided on a webbing take-up shaft is rotatable between an engaged position and a non-engaged position with respect to the gear, and when engaged with the gear, the webbing take-up In a seat belt retractor having a lock pawl member for preventing rotation of the shaft in a direction in which the webbing is pulled out, the angle between the tangent passing through the dedendum circle of the ratchet gear and the engagement surface is an acute angle, and the lock The corner of the tip of the claw member is a curved portion with a small radius, and when the lock claw member engages with the engagement surface of the gear, the direction of the load from the webbing take-up shaft is directed to the lock claw member. A locking mechanism for a seatbelt retractor, characterized in that it is formed to pass through a center of rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8933878U JPS5837407Y2 (en) | 1978-06-30 | 1978-06-30 | Lock mechanism of seat belt retractor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8933878U JPS5837407Y2 (en) | 1978-06-30 | 1978-06-30 | Lock mechanism of seat belt retractor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS555967U JPS555967U (en) | 1980-01-16 |
| JPS5837407Y2 true JPS5837407Y2 (en) | 1983-08-23 |
Family
ID=29016643
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8933878U Expired JPS5837407Y2 (en) | 1978-06-30 | 1978-06-30 | Lock mechanism of seat belt retractor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5837407Y2 (en) |
-
1978
- 1978-06-30 JP JP8933878U patent/JPS5837407Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS555967U (en) | 1980-01-16 |
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