Air bag device
First Claim
Patent Images
1. An air bag device for inflating an air bag when an acceleration is detected above a predetermined level comprising:
- (a) an acceleration sensor having an inertial mass;
(b) a drive shaft contacting said acceleration sensor;
(c) restriction means for preventing said acceleration sensor from operating, said restriction means being axially rotatable between a first rotation position for immobilizing said drive shaft by contacting said drive shaft even when acted upon by said interial mass, and a second rotation position for enabling rotation of said drive shaft, so as to render said acceleration sensor operational; and
(d) a press member which directly comes in contact with said restriction means and rotates said restriction means from said first rotation position to said second rotation position by being pushed in, whereby said acceleration sensor is made operational without fail.
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Accused Products
Abstract
An air bag body to be mounted on a vehicle has a built-in acceleration sensor. A restriction apparatus prevents the acceleration sensor from activating before the air bag body is fixed to a vehicle. After the air bag body is fixed to a vehicle, an operator screws a press member in, and the press body directly comes in contact with the restriction apparatus, rotates the restriction apparatus, and makes the acceleration sensor operational. As the press member directly comes in contact with and rotates the restriction apparatus, the pressing force is transmitted without fail.
14 Citations
19 Claims
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1. An air bag device for inflating an air bag when an acceleration is detected above a predetermined level comprising:
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(a) an acceleration sensor having an inertial mass; (b) a drive shaft contacting said acceleration sensor; (c) restriction means for preventing said acceleration sensor from operating, said restriction means being axially rotatable between a first rotation position for immobilizing said drive shaft by contacting said drive shaft even when acted upon by said interial mass, and a second rotation position for enabling rotation of said drive shaft, so as to render said acceleration sensor operational; and (d) a press member which directly comes in contact with said restriction means and rotates said restriction means from said first rotation position to said second rotation position by being pushed in, whereby said acceleration sensor is made operational without fail. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An air bag device wherein an air bag inflates and comes in contact with an occupant during rapid deceleration of a vehicle comprising:
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(a) an air bag body to be attached to a vehicle body; (b) inflating means accommodated in said air bag body having an explosive mixture to inflate said air bag; (c) an acceleration sensor accommodated in said air bag body to activate said explosive mixture of said inflating means, said acceleration sensor including a drive shaft driven by an inertial mass, said explosive mixture being activated by rotation of said drive shaft; (d) restriction means being engaged with said drive shaft of said acceleration sensor to prevent said acceleration sensor from being activated; and (e) a screw press member which, by being screwed in after said air bag body is fixed to said vehicle body, comes in contact with said restriction means, rotates said restriction means to a position not corresponding to the position of said acceleration sensor, makes said acceleration sensor movable, and rotates without fail said restriction means by directly coming in contact with said restriction means. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. An air bag device which is attached substantially at a center portion of a steering wheel of a vehicle comprising:
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(a) an air bag body; (b) an air bag accommodated in said air bag body in a folded state; (c) gas generatng means which inflates said air bag; (d) a percussion cap which ignites said gas generating means; (e) a firing pin which is urged in a colliding direction with said percussion cap; (f) a support shaft which keeps said firing pin away from said percussion cap; (g) a drive shaft for rotating said support shaft, said drive shaft being fixed to said support shaft. (h) urging means for maintaining an engaging state of said support shaft with said firing pin by imparting an urging force to said drive shaft; (i) an inertial mass which, when acceleration above a predetermined level acts on said inertial mass, moves and rotates said drive shaft, causing said support shaft to detach from said firing pin; (j) a restriction means, which is rotatably supported by said air bag and which prevents said drive shaft from moving by coming in contact with a portion of said drive shaft on the side opposite to a contact portion of said drive shaft with said inertial mass and rotates to a portion where it does not correspond to said drive shaft; and (k) screw push-in means which is rotated by an assembly operator after said air bag is fixed to said steering wheel and which rotates and detaches said restriction means from said drive shaft.
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18. An air bag device which inflates an air bag when an acceleration sensor therein detects acceleration above a predetermined level comprising:
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(a) restriction means for preventing said acceleration sensor from moving, which is rotatable around its axis and prevents said acceleration sensor from moving at a first rotation position and makes said acceleration sensor movable at a second rotation position; and (b) a press member which directly comes in contact with said restriction means and rotates said restriction means from said first rotation position to said second rotation position by being pushed in, whereby said acceleration sensor is made operational without fail and wherein said restriction means includes a first and a second axis coaxially and relatively immovably connected with each other, an arm raidally protruding from said first axis capable of contacting said acceleration sensor, and an arm radially protruding from said second axis capable of contacting said press member. - View Dependent Claims (19)
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Specification