US3565402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Proximity sensing device
Assignee: Breeze Corp Inc
•
Filing: 1969-07-17
•
Granted: 1971-02-23
•
Expires: 1989-07-17
Abstract
Abstract A magnetic sensing device is described which employs a rotating coil and core in a stationary limit position for sensing the proximity of a permanent magnet secured to the object to be sensed. The coil is connected to an amplifier circuit which may discriminate between frequency ranges and which is adapted to actuate a relay when the coil voltage is greater than a predetermined value.
Inventors
- 👤 Ernest A Linke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:14
CPC Classifications
B; B66; B66D; B66D1/00; B66D1/54; B66D1/56
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
152 words
In a load-handling system having cable means coupled between a reel and a movable object, power means for operating said reel to draw said object toward a limit position, the improvement which comprises: a rotating winding positioned adjacent to the limit position for detecting magnetic fields and for generating an alternating current voltage proportional to the intensity of the field; a permanent magnet secured to a portion of said movable object for generating a magnetic flux for detection by the rotating winding; a rectifier circuit connected to the rotating winding for producing direct current voltages derived from the rotating winding; a voltage responsive trigger circuit coupled to the rectifier circuit for producing an output pulse whenever the rectifier circuit produces a voltage above a predetermined value; and a control unit coupled between the output of the trigger circuit and said power means for disabling the power means and stopping the movable object.
Claim 2
Dependent Claim
152 words
In a load-handling system having cable means coupled between a reel and a movable object, power means for operating said reel to draw said object toward a limit position, the improvement which comprises: a rotating winding positioned adjacent to the limit position for detecting magnetic fields and for generating an alternating current voltage proportional to the intensity of the field; a permanent magnet secured to a portion of said movable object for generating a magnetic flux for detection by the rotating winding; a rectifier circuit connected to the rotating winding for producing direct current voltages derived from the rotating winding; a voltage responsive trigger circuit coupled to the rectifier circuit for producing an output pulse whenever the rectifier circuit produces a voltage above a predetermined value; and a control unit coupled between the output of the trigger circuit and said power means for disabling the power means and stopping the movable object.
Claim 3
Dependent Claim
18 words
A power system as claimed in claim 1 wherein said rotating winding is positioned on a ferromagnetic core.
Claim 4
Dependent Claim
22 words
A power system as claimed in claim 1 wherein a band-pass filter is coupled between the rotating winding and said rectifier circuit.
Claim 5
Dependent Claim
29 words
A power system as claimed in claim 1 wherein an amplifier is coupled between the rectifier circuit and said trigger circuit for increasing the operating range of the system.
Claim 6
Dependent Claim
19 words
A power system as claimed in claim 1 wherein said cable passes through the center of the rotating winding.
Claim 7
Dependent Claim
25 words
A power system as claimed in claim 1 wherein the rotating winding is connected to slip rings and brushes for connection to the rectifier circuit.
Claim 8
Dependent Claim
25 words
A power system as claimed in claim 1 wherein said cable is wound on a reel and the reel is turned by an electric motor.
Claim 9
Dependent Claim
73 words
A power system as claimed in claim 1 wherein a second voltage responsive trigger circuit is coupled to the rectifier circuit in parallel with the first-mentioned trigger circuit, the second trigger circuit being set to operate at an input voltage which is less than the input operating voltage of the first trigger circuit, said second trigger circuit coupled to the control unit to reduce the speed of the cable to a predetermined value.
Claim 10
Dependent Claim
24 words
A power system as claimed in claim 1 wherein a relay is coupled between the output of said trigger circuit and the control unit.
Claim 11
Dependent Claim
26 words
A power system as claimed in claim 1, wherein an electric motor is coupled to said rotating winding for turning the winding at a predetermined speed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |