US3780268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Static card reader and control system for access apparatus
Assignee: Rusco Industries Inc
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Filing: 1973-01-04
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Granted: 1973-12-18
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Expires: 1993-01-04
Abstract
Abstract A coded card is located at one end of a plurality of parallel sensors, each having a coil in series with a respective resistor, the junctions of such coils and resistors being connected to a gate network. A second card is inserted at the opposite ends of the sensors, and a switch actuated thereby effects operation of control circuitry to cause a voltage pulse to be applied across all resistor-coil combinations, simultaneously. Both cards have magnetized spots perpendicular to the card surfaces, and such spots are aligned with respective sensors. only where the fields of each pulsed coil and the spot aligned therewith are in the same relation, e.g., opposing, the gate network effects operation of a solenoid of access apparatus.
Inventors
- 👤 W Rogers
- 👤 R Fox
- 👤 E Moulton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:04
CPC Classifications
G; G06; G06K; G06K7/00; G06K7/08; G06K7/082; G06K7/087; G07; G07C; G07C9/00; G07C9/20; G07C9/21
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
247 words
The combination, with access apparatus to be conditioned for operation from a spot magnetized card, of: a plurality of electromagnet sensors each having a coil wound on a core; a respective resistor connected in series with each coil; a switch; means to releasably support spot-mangetized card means in stationary position wherein the fields of spots therein are coaxial with respective coils, said switch being actuated by a portion of said card means when placed in said stationary position; a voltage source; means in circuit with said switch and operable when said switch is actuated by said card means to momentarily couple said voltage source simultaneously across said series-connected coils and resistors thereby to energize said coils; a gate network; respective connections to said gate network from the junctions of said series-connected coils and resistors, said gate network developing a predetermined logic level output only when the coaxial magnetic fields of all the spots and energized coils are in the same relation; pulse developing means coupled to said switch, momentary coupling means and gate network, said pulse developing means being responsive to said predetermined logic level output to develop a pulse of predetermined duration greater than the momentary coupling of said voltage source to said coils and resistors; control means for the apparatus; and enabling means responsive to and operable during the existance of said pulse to condition said control means for operating the apparatus, and for preventing operation of said control means upon expiration of said pulse.
Claim 2
Dependent Claim
247 words
The combination, with access apparatus to be conditioned for operation from a spot magnetized card, of: a plurality of electromagnet sensors each having a coil wound on a core; a respective resistor connected in series with each coil; a switch; means to releasably support spot-mangetized card means in stationary position wherein the fields of spots therein are coaxial with respective coils, said switch being actuated by a portion of said card means when placed in said stationary position; a voltage source; means in circuit with said switch and operable when said switch is actuated by said card means to momentarily couple said voltage source simultaneously across said series-connected coils and resistors thereby to energize said coils; a gate network; respective connections to said gate network from the junctions of said series-connected coils and resistors, said gate network developing a predetermined logic level output only when the coaxial magnetic fields of all the spots and energized coils are in the same relation; pulse developing means coupled to said switch, momentary coupling means and gate network, said pulse developing means being responsive to said predetermined logic level output to develop a pulse of predetermined duration greater than the momentary coupling of said voltage source to said coils and resistors; control means for the apparatus; and enabling means responsive to and operable during the existance of said pulse to condition said control means for operating the apparatus, and for preventing operation of said control means upon expiration of said pulse.
Claim 3
Dependent Claim
48 words
The combination of claim 1, wherein said card means includes respective cards at the opposite ends of said sensors, the fields of the spots in one card being coaxial with respective coils, and the fields of the spots in the other card being coaxial with other respective coils.
Claim 4
Dependent Claim
75 words
The combination of claim 2, wherein said resistors are connected to said voltage source, and wherein said means for momentarily coupling said series-connected coils and resistors across said voltage source includes: means operable upon actuation of said switch to develop a second pulse; and an electronic switch connected between said coils and a point of reference potential; said switch being responsive to said second pulse to connect said coils to said point of reference potential.
Claim 5
Dependent Claim
65 words
The combination of claim 1, including a second switch, said second switch having a movable contact and a pair of fixed contacts, said fixed contacts being connected to respective resistor-coil junctions and said movable contact being connected to said gate network, whereby the connection from either of such junctions to said gate network is via the movable contact when it engages thE associated fixed contact.
Claim 6
Dependent Claim
61 words
The combination of claim 4, including a pair of electromagnets, each positioned adjacent respective portions of said card means; and means operable upon said movable contact engaging one of said fixed contacts to energize said electromagnets, said electromagnets when energized establishing magnetic fields of sufficient strength and directions to establish predetermined magnetic characteristics of the adjacent portions of said card means.
Claim 7
Dependent Claim
32 words
The combination of claim 5, wherein one of said respective portions of said card means is unmagnetized before, and is magnetized in a predetermined direction when, the electromagnet adjacent thereto is energized.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |