US3665607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flight line continuation projection device for air navigation
Assignee: Individual
•
Filing: 1970-02-24
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Granted: 1972-05-30
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Expires: 1990-02-24
Abstract
Abstract A sectional aeronautical chart has the geographical area bounded by the chart divided into two North and South areas, the South area being shown on one face of the chart and the North area being shown on the opposite chart face. Where a pilot wishes to plot his flying course from a point of departure on one face of the chart to a destination point on the opposite chart face, it is difficult to project the flight line continuation onto the opposite face of the chart and maintain the same angle. My device comprises two arms pivoted together and adapted to receive a sectional aeronautical chart therebetween with one arm overlying one chart face and the other arm overlying the other face and the pivot point contacting the chart edge which is a common border line between the two chart faces. Means is provided for simultaneously swinging the two arms in opposite directions about their common pivot so that the angle of the flight line depicted by the arm overlying one chart face will be continued onto the opposite chart face at the same angle by the other arm that overlies this face.
Inventors
- 👤 Kenneth D Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:20
CPC Classifications
G; G01; G01C; G01C21/00; G01C21/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
195 words
In combination: a. a pair of map-gripping members adapted to receive a map therebetween that covers a geographical area, consecutive portions of the area being shown on opposite faces of the map with an edge of the map lying at the junction of the consecutive portions; b. means for interconnecting the members for holding them in parallel relation; c. a first course indicating arm movable over one face of the map that has one of the consecutive portions of the geographical area; d. a second course indicating arm movable over the opposite face of the map that has the other consecutive portion of the geographical area; e. means for pivotally connecting the two arms together, said last-named means contacting the map edge that lies at the junction of the consecutive portions of the geographical area; and f. means for swinging the arm simultaneously in opposite directions through equal arcs about their common pivot means so that said first course indicating arm can register with a desired geographical location on one face of the map and the second course indicating arm can register with a second desired geographical location on the opposite face of the map.
Claim 2
Dependent Claim
195 words
In combination: a. a pair of map-gripping members adapted to receive a map therebetween that covers a geographical area, consecutive portions of the area being shown on opposite faces of the map with an edge of the map lying at the junction of the consecutive portions; b. means for interconnecting the members for holding them in parallel relation; c. a first course indicating arm movable over one face of the map that has one of the consecutive portions of the geographical area; d. a second course indicating arm movable over the opposite face of the map that has the other consecutive portion of the geographical area; e. means for pivotally connecting the two arms together, said last-named means contacting the map edge that lies at the junction of the consecutive portions of the geographical area; and f. means for swinging the arm simultaneously in opposite directions through equal arcs about their common pivot means so that said first course indicating arm can register with a desired geographical location on one face of the map and the second course indicating arm can register with a second desired geographical location on the opposite face of the map.
Claim 3
Dependent Claim
85 words
The combination as set forth in claim 1: and in which a. yielding means is provided for holding the map-gripping members in spaced relation with respect to each other so that a map can be positioned between said members; and b. said pivotal connecting means for the two arms includes means for moving said members into gripping relation with the map after the two arms have been swung into desired angular positions and register with the desired geographical locations on opposite faces of the map.
Claim 4
Dependent Claim
70 words
The combination as set forth in claim 1: and in which a. the first and second course indicating arms are transparent and each has a linear slot that is in line with the common pivot means interconnecting the two arms, the slots being adapted to receive the lead of a pencil or other marking device that can be used for drawing course indicating lines on both faces of the map.
Claim 5
Dependent Claim
196 words
The combination as set forth in claim 1: and in which a. said arm swinging means includes a knob movable in a radial direction with respect to said pivotal means that connects the two course indicating arms together, the radial direction in which said knob is movable toward or away from said pivot means coinciding with the edge of the map lying at the junction of the two consecutive geographical portions of the map; b. a first link having one end pivotally connected to said knob and its other end pivotally connected to said first course indicating arm at a predetermined distance to one side of said pivotal means for the arms; and c. a second link having one end pivotally connected to said knob and its other end pivotally connected to said second couRse indicating arm at the same distance to the other side of said pivotal means for the arms as said first link is spaced from said pivotal means; d. whereby a movement of said knob in a radial direction with respect to said pivotal means will cause said links to swing said course indicating arms through equal arcs and in opposite directions.
Claim 6
Dependent Claim
82 words
The combination as set forth in claim 4: and in which a. said map-gripping members have radially extending slots that coincide with the edge of the map that is received between said members; b. said first link having a bent portion that is slidably received in both slots; c. said second link having a bent portion that is slidably received in both slots; and d. said knob being operatively connected to both bent portions of the links for holding them close together.
Claim 7
Dependent Claim
107 words
The combination as set forth in claim 1: and in which a. a compass rose rotatably mounted on the pivotal means that interconnects the two course indicating arms and being disposed adjacent to the outer face of one of said map-gripping members, this same outer face having a magnetic variation scale printed thereon and disposed adjacent to the periphery of said compass rose; b. said compass rose having a pointer at its periphery that rides over said magnetic variation scale when said compass rose is rotated into the proper position; and c. means for securing said compass rose against accidental rotation after an adjustment has been made.
Claim 8
Dependent Claim
200 words
In combination with a map having adjacent geographical areas printed on the opposite side of the sheet; and with the straight edge of the map being a common boundary line to both areas; a. a first line-indicating means movable over one face of the map; b. a second line-indicating means movable over the opposite face of the map; c. means for pivotally connecting the two line-indicating means together, said pivot means contacting the said straight edge of the map; and d. means for swinging both line-indicating means simultaneously in opposite directions through equal arcs about their common pivot means so that the line-indicating means will indicate the continuation of a straight line from the geographical area shown on one side of the map to the adjoining geographical area shown on the other side of the map, said pivot means including means for maintaining the second line-indicating means on both sides of the map regardless of their angular positions, in a position with respect to the map that an imaginary line bisecting the angle formed between the two line-indicating means, will always be at right angles to the common straight edge of the map when the pivot means contacts said edge.
Claim 9
Dependent Claim
200 words
In combination with a map having adjacent geographical areas printed on the opposite side of the sheet; and with the straight edge of the map being a common boundary line to both areas; a. a first line-indicating means movable over one face of the map; b. a second line-indicating means movable over the opposite face of the map; c. means for pivotally connecting the two line-indicating means together, said pivot means contacting the said straight edge of the map; and d. means for swinging both line-indicating means simultaneously in opposite directions through equal arcs about their common pivot means so that the line-indicating means will indicate the continuation of a straight line from the geographical area shown on one side of the map to the adjoining geographical area shown on the other side of the map, said pivot means including means for maintaining the second line-indicating means on both sides of the map regardless of their angular positions, in a position with respect to the map that an imaginary line bisecting the angle formed between the two line-indicating means, will always be at right angles to the common straight edge of the map when the pivot means contacts said edge.
References Cited (Backward Citations)
US833133A
Cited
US1454782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |