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US 7,243,530 B2Granted
Free fall sensor
AssigneeUbukata Industries Co., Ltd.
InventorsTeruyuki Takeda, Biao Sun
Life of this patent
Estimating the term…
Abstract
A free fall sensor includes an electrically conductive container, an electrically conductive pin having an end inserted into the container, and a movable electrode enclosed in the container, the movable electrode including a coil spring cantilevered on the end of the conductive pin and a weight disposed in an inner space of the coil spring so as to be movable and so as to be prevented from falling off. The weight is a sphere having a smaller diameter than the coil spring.
Claims13
A free fall sensor comprising:
- an electrically conductive container;
- an electrically conductive pin having an end inserted into the container;
- and
- a movable electrode provided in the container, the movable electrode including a coil spring cantilevered on the end of the conductive pin and a weight provided in an inner space of the coil spring so as to be movable and so as to be prevented from falling off, wherein the weight is a sphere having a smaller diameter than the coil spring.
1 more element
A free fall sensor comprising:
- an electrically conductive container;
- an electrically conductive pin having an end inserted into the container;
- and
- a movable electrode provided in the container, the movable electrode including a coil spring cantilevered on the end of the conductive pin and a weight provided in an inner space of the coil spring so as to be movable and so as to be prevented from falling off, wherein the weight comprises a plurality of spheres.
1 more element
A free fall sensor comprising:
- an electrically conductive container;
- an electrically conductive pin having an end inserted into the container;
- and
- a movable electrode provided in the container, the movable electrode including a coil spring cantilevered on the end of the conductive pin, the coil spring having a free end, a sphere provided in an inner space of the coil spring so as to be movable and so as to be prevented from falling off and a weight provided on the free end of the coil spring.
1 more element
A free fall sensor comprising:
- an electrically conductive container;
- an electrically conductive pin having an end inserted into the container;
- and
- a movable electrode provided in the container, the movable electrode including a spring seat fixed to the end of the conductive pin, a coil spring having an end fixed to the spring seat and having a free end and a weight provided on the free end of the coil spring, the spring seat being formed into a shape of a shallow dish and having an inner diameter substantially as large as an outer diameter of the coil spring so that the coil spring is received by the spring seat.
1 more element
A free fall sensor comprising:
- an electrically conductive container;
- an electrically conductive pin having an end inserted into the container;
- and
- a movable electrode provided in the container, the movable electrode including a coil spring fixed to the end of the conductive pin and having a free end and a weight provided on the free end of the coil spring, the coil spring being provided with a displacement limiter for limiting an amount of displacement of the coil spring in a direction of compression to a predetermined range, wherein
- the displacement limiter limits movement of the coil spring by the weight in the direction of compression to a predetermined range;
- and
- the coil spring includes a core loosely inserted in an inner space of the coil spring and having a shorter circularly cylindrical shape than an effective length of the coil spring, and the core collides with a conductive-pin-side member at a predetermined position, thereby limiting the movement of the weight.
4 more elements
A free fall sensor comprising:
- an electrically conductive container;
- an electrically conductive pin having an end inserted into the container;
- a movable electrode provided in the container, the movable electrode including a coil spring fixed to the end of the conductive pin and having a free end and a weight provided on the free end of the coil spring, the coil spring being provided with a displacement limiter for limiting an amount of displacement of the coil spring in a direction of compression to a predetermined range;
- and
- a member provided at the conductive pin side, wherein the weight collides with the member at a predetermined position around the coil spring, whereupon the movement of the weight is limited.
2 more elements
A free fall sensor comprising:
- an electrically conductive container;
- an electrically conductive pin having an end inserted into the container;
- a movable electrode provided in the container, the movable electrode including a coil spring fixed to the end of the conductive pin and having a free end and a weight provided on the free end of the coil spring, the coil spring being provided with a displacement limiter for limiting an amount of displacement of the coil spring in a direction of compression to a predetermined range;
- and
- a protrusion provided in the container, wherein the weight collides against the protrusion at a predetermined position, whereupon the movement of the weight is limited.
2 more elements
Dependencies are inferred from the claim text.