Acceleration detecting device
First Claim
1. An acceleration detecting device comprising:
- a weight to rotate in correspondence with acceleration;
a shaft which is fixed to said weight and becomes a rotational center when said weight rotates;
a rotor which includes a cam portion and which rotates integrally with said weight;
a pair of plate springs disposed with a predetermined gap interposed therebetween, said pair of plate springs including a first plate spring and a second plate spring, said first plate spring and said second plate spring having respective tip portions, where said tip portion of said first plate spring contacts said cam portion of said rotor for urging said rotor in a direction opposite to a direction of rotation of said rotor, said cam portion being for moving said first plate spring towards said second plate spring when said rotor rotates to make said first plate spring contact said second plate spring; and
first and second connection terminals to which said first and second plate springs are respectively connected is, said first and second connection terminals being for generating a first electrical signal indicative of contact of said first plate spring with said second plate spring.
1 Assignment
0 Petitions
Accused Products
Abstract
A weight (4) rotates with a shaft (5) as a rotational center during acceleration detection. A rotor (1) fixed on the weight (4) rotates integrally therewith. A first cam portion 1a of noncircular configuration on the rotor (1) contacts a plate spring (2) and a second cam portion (1b) of semicircular configuration contacts a plate spring (3), urging constantly the rotor (1) in a direction opposite to rotation direction thereof. The plate springs (2) and (3) have a contact-point function, and when the rotor (1) rotates in resistance to urging force thereof, contact is made with a contact points (2a) and (3a) on the plate springs (2) and (3) due to action of the first cam portion (1a) and second cam portion (1b), and the contacting state thereof is detected via a plate (6) and plate (7) as an electrical signal.
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Citations
21 Claims
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1. An acceleration detecting device comprising:
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a weight to rotate in correspondence with acceleration; a shaft which is fixed to said weight and becomes a rotational center when said weight rotates; a rotor which includes a cam portion and which rotates integrally with said weight; a pair of plate springs disposed with a predetermined gap interposed therebetween, said pair of plate springs including a first plate spring and a second plate spring, said first plate spring and said second plate spring having respective tip portions, where said tip portion of said first plate spring contacts said cam portion of said rotor for urging said rotor in a direction opposite to a direction of rotation of said rotor, said cam portion being for moving said first plate spring towards said second plate spring when said rotor rotates to make said first plate spring contact said second plate spring; and first and second connection terminals to which said first and second plate springs are respectively connected is, said first and second connection terminals being for generating a first electrical signal indicative of contact of said first plate spring with said second plate spring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An acceleration detecting device comprising:
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a weight to rotate in correspondence with acceleration; a shaft which is fixed to said weight and becomes a rotational center when said weight rotates; a rotor which includes a cam portion and which rotates integrally with said weight; a pair of plate springs disposed with a predetermined gap interposed therebetween, said pair of plate springs including a first plate spring and a second plate spring, said first plate spring and said second plate spring having respective tip portions, where said tip portion of said first plate spring contacts said cam portion of said rotor for urging said rotor in a direction opposite to a direction of rotation of said rotor, said cam portion being for moving said first plate spring towards said second plate spring when said rotor rotates to make said first plate spring contact said second plate spring; first and second connection terminals to which said first and second plate springs are respectively connected, said first and second connection terminals being for generating a first electrical signal indicative of contact of said first plate spring with said second plate spring; a housing to fix said shaft and said plate springs; and an installation terminal which protrudes from an outer peripheral surface of said housing to fix said housing to a substrate, wherein; said installation terminal passes through a hole provided on said substrate, said installation terminal having a wide contacting portion for making contact with a first surface of said substrate when said installation terminal has passed through said hole and a notch portion disposed between said first surface and an opposite second surface of said substrate when said contacting portion is in contact with said first surface of said substrate and a tip portion of said installation terminal is protruding from said second surface of said substrate, and said tip portion of said installation terminal bends along said second surface of said substrate from said notch portion to securely fix said housing to said substrate. - View Dependent Claims (18)
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19. An acceleration detecting device comprising:
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a weight to rotate in correspondence with acceleration; a shaft which is fixed to said weight and becomes a rotational center when said weight rotates; a rotor which includes a cam portion and which rotates integrally with said weight; a pair of plate springs disposed with a predetermined gap interposed therebetween, said pair of plate springs including a first plate spring and a second plate spring, said first plate spring and said second plate spring having respective tip portions, where said tip portion of said first plate spring contacts said cam portion of said rotor for urging said rotor in a direction opposite to a direction of rotation of said rotor, said cam portion being for moving said first plate spring towards said second plate spring when said rotor rotates to make said first plate spring contact said second plate spring; first and second connection terminals to which said first and second plate springs are respectively connected, said first and second connection terminals being for generating a first electrical signal indicative of contact of said first plate spring with said second plate spring; and a housing for accommodating said shaft and said plate springs; bearings for supporting both ends of said shaft; wherein a press-fitting path leading to a bearing position and into which said shaft is press-fitted is formed in each of said bearings, and a narrow-diameter portion having a diameter narrower than a diameter of said shaft is formed in said press-fitting path.
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20. An acceleration detecting device comprising:
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a weight to rotate in correspondence with acceleration; a shaft which is fixed to said weight and becomes a rotational center when said weight rotates; a rotor which includes a cam portion and which rotates integrally with said weight; a pair of plate springs disposed with a predetermined gap interposed therebetween, said pair of plate springs including a first plate spring and a second plate spring, said first plate spring and said second plate spring having respective tip portions, where said tip portion of said first plate spring contacts said cam portion of said rotor for urging said rotor in a direction opposite to a direction of rotation of said rotor, said cam portion being for moving said first plate spring towards said second plate spring when said rotor rotates to make said first plate spring contact said second plate spring; first and second connection terminals to which said first and second plate springs are respectively connected, said first and second connection terminals being for generating a first electrical signal indicative of contact of said first plate spring with said second plate spring; a housing for accommodating said shaft and said plate springs; bearings for supporting both ends of said shaft; and a dislodgment-preventing member inserted into said press-fitting path to prevent dislodgment of said shaft.
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21. An acceleration detecting device comprising:
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a weight to rotate in correspondence with acceleration; a shaft which is fixed to said weight and becomes a rotational center when said weight rotates; a rotor which includes a cam portion and which rotates integrally with said weight; a pair of plate springs disposed with a predetermined gap interposed therebetween, said pair of plate springs including a first plate spring and a second plate spring, said first plate spring and said second plate spring having respective tip portions, where said tip portion of said first plate spring contacts said cam portion of said rotor for urging said rotor in a direction opposite to a direction of rotation of said rotor, said cam portion being for moving said first plate spring towards said second plate spring when said rotor rotates to make said first plate spring contact said second plate spring; first and second connection terminals to which said first and second plate springs are respectively connected, said first and second connection terminals being for generating a first electrical signal indicative of contact of said first plate spring with said second plate spring; a housing for accommodating said shaft and said plate springs; and bearings for supporting both ends of said shaft; wherein said bearings are groove portions formed in said housing, and two ends of said shaft contact bottom surfaces of said groove portions.
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Specification