Winding – tensioning – or guiding – Reeling device – With spring motor
Patent
1997-02-13
2000-05-30
Nguyen, John Q.
Winding, tensioning, or guiding
Reeling device
With spring motor
2423835, 2423831, 280806, 280807, B60R 2238, B65H 7548
Patent
active
060682086
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a retractor (winding device) for use with a seat belt, and more particularly to improvements in a retractor for use with a seat belt having an emergency lock mechanism.
BACKGROUND ART
Concerning a retractor for use with a seat belt to safely hold a passenger in the seat of a vehicle, an emergency lock type retractor is conventionally used, which includes an emergency lock mechanism to physically lock the retractor by the action of an inertia detecting means, which responds to a sudden acceleration, shock or deceleration of the vehicle, so that the passenger can be effectively and safely restrained in the seat.
For example, Unexamined Japanese Patent Publication No. 5-246303 discloses such an emergency lock type retractor, the lock means of which operates as follows. When a lock operating means which operates by the action of a deceleration detecting means (inertia detecting means) for detecting a deceleration in the case of an emergency of a vehicle makes the first and the second engaging member provided at both ends of a reel shaft (winding shaft) to engage with the first and the second portion to be engaged which are arranged in a frame (retractor base), it is possible to prevent the reel shaft from rotating in a direction in which the webbing is drawn out.
According to the lock means of the above retractor, a plurality of engaging members are synchronously engaged with the portions to be engaged which are formed on both side walls of the frame. Therefore, in the case of necessity, it is possible to positively lock the reel shaft so that the reel shaft can not rotate in a direction in which the webbing is drawn out from the retractor, and at the same time it is possible to provide a sufficiently high engaging force. Accordingly, the reliability of the emergency lock mechanism can be enhanced.
FIGS. 14a and 14b are views to explain the operation of a main pawl (first engaging member) 61 and a lock gear (lock operation means) 64 of the lock means disclosed in the above Unexamined Japanese Patent Publication. FIG. 14a is an enlarged view showing a primary portion of the main pawl 61 at a standby position, and FIG. 14b is an enlarged view showing a primary portion of the main pawl 61 at a lock position. FIG. 15 is a cross-sectional view showing an outline of the primary portion of the retractor.
A cam shape of the cam hole 64n of the lock gear 64 is shown by a phantom line in the drawing. In this case, the cam shape of the cam hole 64n is determined as follows. When the main pawl 61 is transferred from a state shown in FIG. 14a to a state of perfect lock shown in FIG. 14b by a relative rotation of the reel shaft 63 in the direction of .alpha., the main pawl 61 conducts a self-locking operation by the action of the teeth 62f of a side wall of the frame on a steep inclined plane side. The cam shape is determined so that the lock gear 64, which is denoted by the cam holes 64k, 64m and 64n in FIG. 14, can be a little reversed in the direction of .beta. by the cam follower 61f via the guide cam surface 64n.sub.2 of the cam hole 64n. When the cam shape of the cam hole 64n is determined as described above, in the case of a perfect engagement of the main pawl 61 with the teeth 62f, an engaging claw of the lever of the deceleration detecting means not shown can be released from the engagement with the teeth of the lock gear, so that the engaging claw of the lever of the deceleration detecting means can be put into a free condition.
That is, when the cam follower 61f is transferred from a standby position shown in FIG. 14a to a lock position shown in FIG. 14b, an acting force of the cam follower 61f is transmitted to the lock gear 64, so that the lock gear 64 is reversed in the direction of winding the webbing by the action of the guide cam surface 64n.sub.2. In this way, the lock gear reverse rotation control means is composed.
In this case, the lock operation means includes a reverse rotation control means by which the lock operation means is reversed by a predete
REFERENCES:
patent: 3692253 (1972-09-01), Curran
patent: 4347992 (1982-09-01), Imai
patent: 4350313 (1982-09-01), Adomeit
patent: 4549705 (1985-10-01), Fohl
patent: 4726541 (1988-02-01), Tsukamoto et al.
patent: 4729523 (1988-03-01), Saitou et al.
patent: 5050815 (1991-09-01), Doty et al.
patent: 5441209 (1995-08-01), Fujimura et al.
International Search Report.
Hirase Satoshi
Matsuki Masuo
Nguyen John Q.
NSK Ltd.
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