Winding – tensioning – or guiding – Reeling device – With spring motor
Patent
1997-04-23
1998-10-13
Darling, John P.
Winding, tensioning, or guiding
Reeling device
With spring motor
B60R 2236
Patent
active
058200592
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a retractor (winding device) used for a seat belt device. More particularly, the present invention relates to improvements in a retractor for seat belt having both an emergency locking mechanism and an automatic locking mechanism.
BACKGROUND ART
Concerning a seat belt for holding a passenger in a seat of a vehicle safely, there is conventionally provided a seat belt device having a retractor in which an emergency locking mechanism is operated to restrict a body of a passenger in the case of emergency and an automatic locking mechanism can be operated to fix a piece of baggage or a child seat to a seat of a vehicle.
Namely, the above retractor for seat belt comprises: an emergency locking mechanism having a locking means engaged with a winding shaft so that the winding shaft can not be rotated in a direction of drawing the webbing and also having an inertia detecting means for operating the locking means in the case of emergency of a vehicle; and a controlling means for controlling the operation of the emergency locking mechanism in accordance with the webbing winding condition so that the locking means can be appropriately set at an engaging position or a non-engaging position with respect to the winding shaft. When the controlling means controls the locking means so that it can be engaged with the winding shaft, the winding shaft is locked and prevented -from rotating in the direction of drawing the webbing. In this way, the automatic locking mechanism is operated.
Japanese Unexamined Utility Model Publication No. 5-72612 discloses a retractor for seat belt having the above controlling means, so that the emergency locking retractor can be surely changed over to the automatic locking retractor.
FIG. 27 is a front view showing the operation of the locking mechanism of the webbing winding device disclosed in Japanese Unexamined Utility Model Publication No. 5-72612 described above.
The webbing winding device is operated as follows. In the normal operation in which a passenger wears the seat belt, the locking wheel 242 is rotated integrally with the webbing winding shaft (not shown in the drawing) without causing a delay of rotation with respect to the webbing winding shaft. Accordingly, the webbing can be freely drawn out. When the winding shaft is given an acceleration, the value of which is higher than a predetermined value, in the webbing drawing direction in the case of emergency, rotation of the locking wheel 242 is delayed with respect to the webbing winding shaft. Accordingly, the locking means (not shown in the drawing) prevents the webbing from being drawn out. In this way, the emergency locking mechanism is operated.
The controlling means, which changes over the automatic locking mechanism between an operating condition and a non-operating condition, includes: an engaging lever 230 rotatably supported by a support shaft 294, the claw portion 234 of the engaging lever 230 being oscillated so that it can be engaged with and disengaged from a ratchet tooth 246 arranged on an outer circumference of the locking wheel 242; and a release gear 202 for oscillating this engaging lever 230 round the support shaft 294 in accordance with the webbing winding condition.
There is provided an arm 232 which is formed integrally with the engaging lever 230. At an end of the arm 232, there is provided an engaging pin 236. In the normal operation, this engaging pin 236 is inserted into an outside cam groove 240 formed in the release gear 202. In this condition, the claw 234 of the engaging lever 230 is not engaged with the ratchet tooth 246. Therefore, the automatic locking mechanism is put in a non-operating condition.
When the webbing (not shown in the drawing) is drawn out, the release gear 202 is rotated counterclockwise (in the direction of arrow A in the drawing). When an amount of the webbing that has been drawn out reaches a predetermined value, the engaging pin 236 of the engaging lever 230 is moved from the outside cam groove 240 and inserted into the narro
REFERENCES:
patent: 4566649 (1986-01-01), Peterson, III
patent: 4749143 (1988-06-01), Tsukamoto et al.
patent: 5257754 (1993-11-01), Hishon
patent: 5328120 (1994-07-01), Schmid
patent: 5367917 (1994-11-01), Hishon et al.
patent: 5520349 (1996-05-01), Kapanka et al.
Hibata Ganta
Matsuki Masuo
Darling John P.
NSK Ltd.
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