US3877314A
Expired / Lapsed
US
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Accelerometer
Assignee: Illinois Tool Works Inc
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Filing: 1973-03-26
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Granted: 1975-04-15
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Expires: 1993-03-26
Abstract
Abstract The embodiment of the invention disclosed herein is directed to an accelerometer which has a movable magnetic member positioned in magnetic relationship with a closed loop magnetic core member to be magnetically saturated and unsaturated as a result of movement of the magnet. The movable magnet is magnetically held to a ferrous metal plate or element with a force proportional to the magnetic field strength. The degree of acceleration or deceleration required to dislodge the movable magnetic member will be indicated when the magnetic state of the closed loop magnetic core member changes as the magnet moves relative thereto.
Inventors
- 👤 Victor M Bernin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:46
CPC Classifications
G; G01; G01P; G01P15/00; G01P15/02; G01P15/08; G01P15/0891; G01P15/11
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
224 words
An accelerometer comprising in combination; a movable magnetic member having a predetermined magnetic field strength, a ferrous metal member magnetically to receive and hold said movable magnetic member with a force proportional to said predetermined magnetic field strength, at least one closed loop magnetic core structure capable of being magnetically saturated in one state and magnetically unsaturated in another state as a result of the presence and absence, respectively, of a magnetic field from said movable magnetic member, said closed loop magnetic core member being positioned relative to said movable magnetic member to be in one of its magnetic states, a drive line passing through said closed loop magnetic core member, said drive line arranged to receive signal information therealong, a sense line passing through said closed loop magnetic core member, said sense line arranged for connection in circuit witH signal receiving means, said sense line receiving signal information from said drive line as a result of transformer coupling therebetween when said closed loop magnetic core member is in an unsaturated state, whereby acceleration forces applied to said movable magnetic member equal or are greater than the force produced by said predetermined magnetic field strength will cause said movable magnetic member to separate from said ferrous metal member and move relative to said closed loop magnetic core member to change the magnetic state thereof.
Claim 2
Dependent Claim
224 words
An accelerometer comprising in combination; a movable magnetic member having a predetermined magnetic field strength, a ferrous metal member magnetically to receive and hold said movable magnetic member with a force proportional to said predetermined magnetic field strength, at least one closed loop magnetic core structure capable of being magnetically saturated in one state and magnetically unsaturated in another state as a result of the presence and absence, respectively, of a magnetic field from said movable magnetic member, said closed loop magnetic core member being positioned relative to said movable magnetic member to be in one of its magnetic states, a drive line passing through said closed loop magnetic core member, said drive line arranged to receive signal information therealong, a sense line passing through said closed loop magnetic core member, said sense line arranged for connection in circuit witH signal receiving means, said sense line receiving signal information from said drive line as a result of transformer coupling therebetween when said closed loop magnetic core member is in an unsaturated state, whereby acceleration forces applied to said movable magnetic member equal or are greater than the force produced by said predetermined magnetic field strength will cause said movable magnetic member to separate from said ferrous metal member and move relative to said closed loop magnetic core member to change the magnetic state thereof.
Claim 3
Dependent Claim
27 words
The accelerometer according to claim 1, wherein means are provided to adjust the magnetic force of attraction between said movable magnetic member and said ferrous metal member.
Claim 4
Dependent Claim
15 words
The accelerometer according to claim 1, wherein said movable magnetic member is a permanent magnet.
Claim 5
Dependent Claim
33 words
The accelerometer according to claim 3, further including means for testing the force of attraction of said movable magnetic member to said ferrous metal member to insure proper operation at a given acceleration.
Claim 6
Dependent Claim
41 words
The accelerometer according to claim 4, wherein said test means is an electro-magnet of opposite magnetic polarity to cause repulsion of said movable magnetic member at a rate equal to the force intended to be detected as a result of acceleration.
Claim 7
Dependent Claim
160 words
An accelerometer comprising at least one saturable magnetic core, a drive line coupled to said core for supplying electrical signals, a sense line coupled to said core for receiving said electrical signals from said drive line when said core is not saturated, a permanent magnet movable with respect to said core in response to an acceleration force which acts upon said permanent magnet so as to control the saturation of said core in response to the acceleration of said permanent magnet and magnetic positioning means for positioning said permanent magnet at a nominal position with respect to said magnetic core when said acceleration force is substantially zero, wherein said magnetic positioning means is a magnetizable member and said accelerometer comprises magnetizing means coupled to said magnetizable member so as to magnetize said member in a manner that controls the position of said permanent magnet with respect to said magnetic core so that the operability of said accelerometer may be verified.
Claim 8
Dependent Claim
160 words
An accelerometer comprising at least one saturable magnetic core, a drive line coupled to said core for supplying electrical signals, a sense line coupled to said core for receiving said electrical signals from said drive line when said core is not saturated, a permanent magnet movable with respect to said core in response to an acceleration force which acts upon said permanent magnet so as to control the saturation of said core in response to the acceleration of said permanent magnet and magnetic positioning means for positioning said permanent magnet at a nominal position with respect to said magnetic core when said acceleration force is substantially zero, wherein said magnetic positioning means is a magnetizable member and said accelerometer comprises magnetizing means coupled to said magnetizable member so as to magnetize said member in a manner that controls the position of said permanent magnet with respect to said magnetic core so that the operability of said accelerometer may be verified.
Claim 9
Dependent Claim
136 words
An accelerometer comprising at least one saturable magnetic core, a drive line coupled to said core for supplying electrical signals, a sense line coupled to said core for receiving said electrical signals from said drive line when said core is not saturated, a permanent magnet movable with respect to said core in response to an acceleration force which acts upon said permanent magnet so as to control the saturation of said core in response to the acceleration of said permanent magnet, magnetic positioning means for positioning said permanent magnet at a nominal position with respect to said magnetic core when said acceleration force is substantially zero, and comprising magnetic control means coupled to control the position of said permanent magnet with respect to said magnetic core so that the operability of said accelerometer may be verified.
Claim 10
Dependent Claim
136 words
An accelerometer comprising at least one saturable magnetic core, a drive line coupled to said core for supplying electrical signals, a sense line coupled to said core for receiving said electrical signals from said drive line when said core is not saturated, a permanent magnet movable with respect to said core in response to an acceleration force which acts upon said permanent magnet so as to control the saturation of said core in response to the acceleration of said permanent magnet, magnetic positioning means for positioning said permanent magnet at a nominal position with respect to said magnetic core when said acceleration force is substantially zero, and comprising magnetic control means coupled to control the position of said permanent magnet with respect to said magnetic core so that the operability of said accelerometer may be verified.
Claim 11
Dependent Claim
132 words
An accelerometer comprising at least one magnetic core whose magnetic characteristics change upon the application of pressure to said core, a drive line coupled to said core for supplying electrical signals, a sense line coupled to said core for receiving said electrical signals, a magnetizable member movable with respect to said core in response to an acceleration force acting on said magnetizable member so as to impart pressure upon said magnetic core in order to control the magnetic characteristics of said core in response to the acceleration of said magnetizable member and magnetizing means coupled to said magnetizable member so as to magnetize said member in a manner that controls the position of said magnetizable member with respect to said magnetic core so that the operability of said accelerometer may be verified.
Claim 12
Dependent Claim
132 words
An accelerometer comprising at least one magnetic core whose magnetic characteristics change upon the application of pressure to said core, a drive line coupled to said core for supplying electrical signals, a sense line coupled to said core for receiving said electrical signals, a magnetizable member movable with respect to said core in response to an acceleration force acting on said magnetizable member so as to impart pressure upon said magnetic core in order to control the magnetic characteristics of said core in response to the acceleration of said magnetizable member and magnetizing means coupled to said magnetizable member so as to magnetize said member in a manner that controls the position of said magnetizable member with respect to said magnetic core so that the operability of said accelerometer may be verified.
Claim 13
Dependent Claim
136 words
An accElerometer comprising at least one saturable magnetic core, a drive line coupled to said core for supplying electrical signals, a sense line coupled to said core for receiving said electrical signals from said drive line when said core is not saturated, a magnetically-effected member movable with respect to said core in response to an acceleration force which acts upon said magnetically-effected member so as to control the saturation of said core in response to the acceleration of said magnetically-effected member, magnetic positioning means for positioning said magnetically-effected member at a nominal position with respect to said magnetic core when said acceleration force is substantially zero, and comprising magnetic control means coupled to control the position of said magnetically-effected member with respect to said magnetic core so that the operability of said accelerometer may be verified.
Claim 14
Dependent Claim
136 words
An accElerometer comprising at least one saturable magnetic core, a drive line coupled to said core for supplying electrical signals, a sense line coupled to said core for receiving said electrical signals from said drive line when said core is not saturated, a magnetically-effected member movable with respect to said core in response to an acceleration force which acts upon said magnetically-effected member so as to control the saturation of said core in response to the acceleration of said magnetically-effected member, magnetic positioning means for positioning said magnetically-effected member at a nominal position with respect to said magnetic core when said acceleration force is substantially zero, and comprising magnetic control means coupled to control the position of said magnetically-effected member with respect to said magnetic core so that the operability of said accelerometer may be verified.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |