US433084A - Protractor - Google Patents
Protractor Download PDFInfo
- Publication number
- US433084A US433084A US433084DA US433084A US 433084 A US433084 A US 433084A US 433084D A US433084D A US 433084DA US 433084 A US433084 A US 433084A
- Authority
- US
- United States
- Prior art keywords
- frame
- piece
- protractor
- edges
- bearing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000036633 rest Effects 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/56—Gauges for measuring angles or tapers, e.g. conical calipers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B3/00—Measuring instruments characterised by the use of mechanical techniques
- G01B3/56—Gauges for measuring angles or tapers, e.g. conical calipers
- G01B3/563—Protractors
Definitions
- My invention relates to improvements in protractors, in which a piece bearing rulingedges is pivoted to a frame which is moved along a straight edge to be used in conjunction with it; and the objects of my improvement are, first, to provide an adjustable protractor with ruling-edges at right angles to each other to enable lines and their perpendicular-s to be drawn at any given angle with the straight edge at one setting of the protractor, and, second, to provide a convenient device for setting the instrument at particular angles.
- Figure 1 is a top view of the instrument
- Fig. 2 is a vertical section on the line 1 2, Fig. 1.
- the piece A constitutes a frame with a straight edge a, which rests against or slides along a straight edge to be used in conjunction with the instrument.
- a pin C At the opposite end of A is a pin C, about which there turns a piece D, having two ruling-edges (Z d at right angles to each other and a graduated are e.
- the piece D also has notches f ff f f, cut so that the edges (Z d shall lie at particular angles with the straight edge a of the frame when the stopE engages these notches.
- the stop E is pivoted to A at g, so that by pressing down one end of Eone set of notches fff may be engaged and the other set ff disengaged, or by bringing E to a horizontal position both sets of notches are disengaged and the piece I) is free to turn about A through its entire range.
- the range of turning of D about A is such that the angles made by the two ruling-edges (Z (Z with the straight-edge a will include all angles from naught to three hundred and sixty degrees.
- the piece A has a hole through it at h, which shows a portion of the graduated are c, and an index 2', attached to the under side of A,
- a spring F prevents a too-easy turning of D about the pin C, while a set-screw gives additional security when desired.
Description
(No Model.)
D. J. KELSEY.
PROTRAGTOR.
Patented July 29, 1890.
INVENTOR UNITED STATES PATENT OFFICE.
DUANE .I. KELSEY, OF NEIV HAVEN, CONNECTICUT.
PROT-RACTO R.
SPECIFICATION forming part of Letters Patent No. 433,084, dated July 29, 1890.
Application filed September 10, 1889. Serial No. 323,567. (No model.)
To all whom it may concern.-
Be it known that I, DUANE J. KELsEY, a citizen of the United States, residing at New Haven, in the county of New Haven and State of Connecticut, have invented a new and useful Protractor, of which the following is a specification.
My invention relates to improvements in protractors, in which a piece bearing rulingedges is pivoted to a frame which is moved along a straight edge to be used in conjunction with it; and the objects of my improvement are, first, to provide an adjustable protractor with ruling-edges at right angles to each other to enable lines and their perpendicular-s to be drawn at any given angle with the straight edge at one setting of the protractor, and, second, to provide a convenient device for setting the instrument at particular angles. I attain these objects by the mechanism illustrated in the accompanying drawings, in which Figure 1 is a top view of the instrument, and Fig. 2 is a vertical section on the line 1 2, Fig. 1.
The piece A constitutes a frame with a straight edge a, which rests against or slides along a straight edge to be used in conjunction with the instrument. At the opposite end of A is a pin C, about which there turns a piece D, having two ruling-edges (Z d at right angles to each other and a graduated are e. The piece D also has notches f ff f f, cut so that the edges (Z d shall lie at particular angles with the straight edge a of the frame when the stopE engages these notches. The stop E is pivoted to A at g, so that by pressing down one end of Eone set of notches fff may be engaged and the other set ff disengaged, or by bringing E to a horizontal position both sets of notches are disengaged and the piece I) is free to turn about A through its entire range. The range of turning of D about A is such that the angles made by the two ruling-edges (Z (Z with the straight-edge a will include all angles from naught to three hundred and sixty degrees. The piece A has a hole through it at h, which shows a portion of the graduated are c, and an index 2', attached to the under side of A,
thus allowing the angle through which D is turned with respect to A to be easily read. A spring F prevents a too-easy turning of D about the pin C, while a set-screw gives additional security when desired.
I am aware that prior to my invention protractors have been made having a piece bearing ruling-edges and a graduated are so arranged as to turn within or upon a frame, which latter is held against a straight edge to be used in conjunction with it. I therefore do not claim such a combination, broadly; but
\Vhat I do claim as my invention, and tie sire to secure by Letters Patent, is
1. The combination, in a protractor, of a graduated arc and two ruling-edges at right angles to each other, all in the same or parallel planes, the whole constituting a'movable piece arranged to turn upon a circular bearing concentric with the graduated are and supported by a frame, said frame eontaining a straight or guiding edge, an opening with an index over the graduated arc, and the aforesaid bearing for the movable piece, also a clip and set-screw for securing said movable piece, the center of said bearing and index being upon a line of symmetry of 'the frame perpendicular to its guidingedge, the whole arranged to lie smoothly upon a plane passing through said rulingedges, all substantially as set forth.
2. The combination,in aprotractor having a movable piece D, with ruling-edges (I d, arranged to turn upon a bearing in a frame A, said frame containing a straight or guiding edge a, of a stop E,pivoted to frame A, so as to rock in a slot in the latter in a plane perpendicular to that of the turning of the movable piece D aboutits bearing in the frame A, and arranged so as to be forced by the operators finger into or out of contact with certain notches in the movable piece D, whereby the latter may be readily set to particular angles with respect to the frame A, substantially as set forth.
DUANE .I. KELSEY. \Vitnesses:
LoUIs D. BEEHER, FRED. A. YEOMANS.
Publications (1)
Publication Number | Publication Date |
---|---|
US433084A true US433084A (en) | 1890-07-29 |
Family
ID=2501987
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US433084D Expired - Lifetime US433084A (en) | Protractor |
Country Status (1)
Country | Link |
---|---|
US (1) | US433084A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2492289A (en) * | 1947-11-06 | 1949-12-27 | Hoppe Leo | Method of making printing chases |
US2501521A (en) * | 1946-09-23 | 1950-03-21 | William H Howard | Drafting instrument |
US2570356A (en) * | 1949-04-05 | 1951-10-09 | Luis Michael | Combination square and protractor |
-
0
- US US433084D patent/US433084A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2501521A (en) * | 1946-09-23 | 1950-03-21 | William H Howard | Drafting instrument |
US2492289A (en) * | 1947-11-06 | 1949-12-27 | Hoppe Leo | Method of making printing chases |
US2570356A (en) * | 1949-04-05 | 1951-10-09 | Luis Michael | Combination square and protractor |
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