Patent US3751813A successfully refreshed from Google Patents.
US3751813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slide rule and compass device
Assignee: Individual
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Filing: 1971-11-11
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Granted: 1973-08-14
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Expires: 1991-11-11
Abstract
Abstract A combined slide rule and compass device including a slide rule type body and an elongated main slide mounted for longitudinal movement within a guideway in the body, with two external slide elements being disposed about the body and carrying a pair of compass points which are adjustable toward and away from one another for use in drawing or measuring circles. One of these external slides also carries a hairline for coaction with the scales on the body and main slide in making a slide rule calculation. Preferably, the main slide has an enlarged head at one of its ends, which may be detachable from the main slide and onto which at least one and preferably both of the external slides are movable to a retracted position in which they do not interfere with use of the device as a conventional marking or measuring ruler.
Inventors
- 👤 E Kuwada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:24
CPC Classifications
B; B43; B43L; B43L9/00; G; G06; G06G; G06G1/00; G06G1/02; G06G1/04
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
162 words
A device comprising an elongated rule body containing a longitudinal guideway, an elongated main slide mounted in said guideway for longitudinal sliding movement, logarithmic slide rule scales on said body and main slide readable against one another to make a slide rule calculation, a first external slide mounted for movement longitudinally along said rule body and having marking means for indicating coacting readings on the scales, means for mounting a first compass point to said first external slide, a second external slide mounted for movement along said rule body, means for mounting a second compass point to said second external slide, at least one of said external slides and the carried compass point being movable longitudinally beyond an end of said body, means for connecting said one external slide to a portion of said main slide beyond said body, and means for locking said main slide and the connected external slide in any of a series of different positions within said guideway.
Claim 2
Independent Claim
162 words
A device comprising an elongated rule body containing a longitudinal guideway, an elongated main slide mounted in said guideway for longitudinal sliding movement, logarithmic slide rule scales on said body and main slide readable against one another to make a slide rule calculation, a first external slide mounted for movement longitudinally along said rule body and having marking means for indicating coacting readings on the scales, means for mounting a first compass point to said first external slide, a second external slide mounted for movement along said rule body, means for mounting a second compass point to said second external slide, at least one of said external slides and the carried compass point being movable longitudinally beyond an end of said body, means for connecting said one external slide to a portion of said main slide beyond said body, and means for locking said main slide and the connected external slide in any of a series of different positions within said guideway.
Claim 3
Dependent Claim
43 words
A device as recited in claim 1, in which said means for connecting said one external slide to said main slide include an enlarged head carried by an end of said main slide and about which said one external slide is detachably receivable.
Claim 4
Dependent Claim
20 words
A device as recited in claim 2, including means releasably securing said head to said end of the main slide.
Claim 5
Dependent Claim
111 words
A device as recited in claim 1, in which said means for connecting said one external slide to said main slide include an enlarged head carried by an end of said main slide and about which said one external slide is detachably receivable, and a lock screw for manually locking said one external slide in fixed position on said head and also locking said one external slide in fixed position on said body, there being a second lock screw for securing the other of said external slides in fixed position on said body, said means for locking said main slide in fixed position within said guideway including a third lock screw.
Claim 6
Independent Claim
126 words
A device comrpising an elongated rule body containing a longitudinal guideway, an elongated main slide mounted in said guideway for longitudinal sliding movement, logarithmic slide rule scales on said body and main slide readable against one another to make a slide rule calculation, a second slide mounted to said body for sliding movement therealong and having marking means coacting with said scales to indicate aligned readings thereon, means for mounting a compass point to said second slide, a third slide mounted to said body for longitudinal sliding movement therealong, means for mounting another compass point to said third slide, an enlarged head carried by one end of said main slide at a location beyond said body, and means detachably securing said head to said main slide.
Claim 7
Independent Claim
126 words
A device comrpising an elongated rule body containing a longitudinal guideway, an elongated main slide mounted in said guideway for longitudinal sliding movement, logarithmic slide rule scales on said body and main slide readable against one another to make a slide rule calculation, a second slide mounted to said body for sliding movement therealong and having marking means coacting with said scales to indicate aligned readings thereon, means for mounting a compass point to said second slide, a third slide mounted to said body for longitudinal sliding movement therealong, means for mounting another compass point to said third slide, an enlarged head carried by one end of said main slide at a location beyond said body, and means detachably securing said head to said main slide.
Claim 8
Dependent Claim
33 words
A device as recited in claim 5, in which at least one of said second and third slides is movable beyond said rule body to a retracted position of reception about said head.
Claim 9
Dependent Claim
32 words
A device as recited in claim 6, in which said head has a straight edge extending transversely of said main slide and transversely of a straight edge formed along said rule body.
Claim 10
Independent Claim
144 words
A device comprising an elongated rule body containing a longitudinal guideway, an elongated main slide mounted in said guideway for longitudinal sliding movement, logarithmic slide rule scales on said body and said main slide readable against one another to make a slide rule calculation, a first external slide extending essentially about the outside of said body and slidable longitudinally therealong and having mArking means coacting with said slide rule scales to indicate corresponding readings thereon, means for mounting a first compass point to said first external slide, a second external slide extending essentially about the outside of said body and slidable longitudinally therealong relative to said body and relative to said first external slide, means for mounting a second compass point to said second external slide, and an enlarged head carried by said main slide at one end thereof and longitudinally beyond said body.
Claim 11
Independent Claim
144 words
A device comprising an elongated rule body containing a longitudinal guideway, an elongated main slide mounted in said guideway for longitudinal sliding movement, logarithmic slide rule scales on said body and said main slide readable against one another to make a slide rule calculation, a first external slide extending essentially about the outside of said body and slidable longitudinally therealong and having mArking means coacting with said slide rule scales to indicate corresponding readings thereon, means for mounting a first compass point to said first external slide, a second external slide extending essentially about the outside of said body and slidable longitudinally therealong relative to said body and relative to said first external slide, means for mounting a second compass point to said second external slide, and an enlarged head carried by said main slide at one end thereof and longitudinally beyond said body.
Claim 12
Dependent Claim
18 words
A device as recited in claim 8, including a connection securing said head to said main slide removably.
Claim 13
Dependent Claim
49 words
A device as recited in claim 8, in which said enlarged head has a recess removably and frictionally receiving said end of said main slide in a relation frictionally holding said head on the main slide but enabling forced separation of the head from the main slide when desired.
Claim 14
Dependent Claim
33 words
A device as recited in claim 8, in which both of said external slides are movable longitudinally off of said slide body and to a retracted position of reception about said enlarged head.
Claim 15
Dependent Claim
78 words
A device as recited in claim 8, in which both of said external slides are movable longitudinally off of said slide body and to a retracted position of reception about said enlarged head, said head being shaped to receive said external slides in positions in which they are located slightly higher than they are when received about said body and in a relation avoiding interference with engagement of an undersurface of said body with a sheet of paper.
Claim 16
Dependent Claim
22 words
A device as recited in claim 12, including a connection securing said enlarged head to said end of the main slide detachably.
Claim 17
Dependent Claim
27 words
A device as recited in claim 13, including means for releasably locking said main slide in any of a series of different longitudinal settings within said guideway.
Claim 18
Dependent Claim
71 words
A device as recited in claim 14, including lock screws for releasably securing said two external slides in any of a series of different positions along said body and for releasably locking said external slides in fixed positions on said head, ther being a measuring scale on said rule body coacting with points carried by said external slides to indicate the distance therebetween in any of different settings of the points.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |