US50173A - Improvement in dividers - Google Patents
Improvement in dividers Download PDFInfo
- Publication number
- US50173A US50173A US50173DA US50173A US 50173 A US50173 A US 50173A US 50173D A US50173D A US 50173DA US 50173 A US50173 A US 50173A
- Authority
- US
- United States
- Prior art keywords
- dividers
- leg
- legs
- centering
- improvement
- 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
- 230000000875 corresponding Effects 0.000 description 2
- 238000007373 indentation Methods 0.000 description 2
- 230000001105 regulatory Effects 0.000 description 2
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B5/00—Measuring for diagnostic purposes; Identification of persons
- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
Definitions
- This invention consists in combining with the ordinary legs of a pair of dividers a centering-leg, which passes down through the head ot' the dividers and is adiustablein a nut suspended by suitablelinks or toggle-arms from the ordinary legs in such a manner that said centering-leg can be adj usted up and down, according to the position of the main legs, and that bythe centering-leg the distance measured oft by the main legs can be divided off in two equal parts Without loss of time.
- A represents the head of a pair of dividers, which forms the bearings for the pivot a, on which the two legs B B swing.
- an arc, U is secured to the leg B, and made to pass through a mortise in the leg B in ⁇ the usual manner.
- a screw, b, and spring b serve to give to the legs the nal adjustment after the same have been set and fastened by lhe set-screw c, passing through the leg B and bearing on the arc C.
- the head A is perforated with a round hole to receive the centering-leg D.
- the leg passes freely through the hole in the head, and it is provided with a screw-thread, e, which is tapped into a nut,f, and this nut is suspended from the main legs by means of two toggle-arms or links, g, as clearly shown in Fig. l of the drawings.
- links g connect to the main legs by means of pivots h, and to each other and to the nut f by the pivot t', and they are exactly equal in length, so the nut will always remain in the center between the main legs, Awhatever the position of the latter.
- the points of the main legs are placed in the ends ot' thc line and the centering-legl is screwed down untilits point strikes the surface on which the main legs rest.
- the indentation produced'by the point of the centering-leg indicates the correct center between the two indentatious made by the points of the main legs.
- the point of the centering-leg should be found to be not exactly ige; the center between the points ofthe main legs, the defect can he easily regulated by the nut and spring applied to one end ofthe arc O.
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Cardiology (AREA)
- Engineering & Computer Science (AREA)
- Heart & Thoracic Surgery (AREA)
- Physiology (AREA)
- Biophysics (AREA)
- Pathology (AREA)
- Vascular Medicine (AREA)
- Biomedical Technology (AREA)
- Physics & Mathematics (AREA)
- Medical Informatics (AREA)
- Molecular Biology (AREA)
- Surgery (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
- Veterinary Medicine (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Description
`tion of this invention.
UNITED STATES PATENT OFFICE..
S. ADDISON SHURTLEFF, OF TAUNTON, MASSACHUSETTS.
IMPROVEMENT IN DIVIDERS.
Specilieation forming part of Letters Patent No. 50,173, dated September 26, 1865.
To all whom it may concer/rt:
Beitknown that I, S. ADDrsoN SHURTLEEF, ot' Taunton, in the county ot' Bristol and State of Massachusetts, have invented a new and useful Improvement in Dividers; and I do hereby declare that the'ollowing is a full, clear, and exact description thereof, which will enable those skilled in the artto make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which- Figure l represents a sectional front eleva- Fig. 2 is a transverse section of the same.
Similar letters of reference indicate corresponding parts.
This invention consists in combining with the ordinary legs of a pair of dividers a centering-leg, which passes down through the head ot' the dividers and is adiustablein a nut suspended by suitablelinks or toggle-arms from the ordinary legs in such a manner that said centering-leg can be adj usted up and down, according to the position of the main legs, and that bythe centering-leg the distance measured oft by the main legs can be divided off in two equal parts Without loss of time.
A represents the head of a pair of dividers, which forms the bearings for the pivot a, on which the two legs B B swing. In orderto keep these legs steady while they open and close, an arc, U, is secured to the leg B, and made to pass through a mortise in the leg B in `the usual manner. A screw, b, and spring b serve to give to the legs the nal adjustment after the same have been set and fastened by lhe set-screw c, passing through the leg B and bearing on the arc C. The head A is perforated with a round hole to receive the centering-leg D. The leg passes freely through the hole in the head, and it is provided with a screw-thread, e, which is tapped into a nut,f, and this nut is suspended from the main legs by means of two toggle-arms or links, g, as clearly shown in Fig. l of the drawings. The
links g connect to the main legs by means of pivots h, and to each other and to the nut f by the pivot t', and they are exactly equal in length, so the nut will always remain in the center between the main legs, Awhatever the position of the latter.
If it is desired to find the centerot'a certain distance or the middle of a line, the points of the main legs are placed in the ends ot' thc line and the centering-legl is screwed down untilits point strikes the surface on which the main legs rest. The indentation produced'by the point of the centering-leg indicates the correct center between the two indentatious made by the points of the main legs.
lt' the point of the centering-leg should be found to be not exactly ige; the center between the points ofthe main legs, the defect can he easily regulated by the nut and spring applied to one end ofthe arc O.
By theuse of my centering-dividers the workman is enabled to put the tool onto the work and nd the center instantly, thereby saving much time and labor; and, furthermore, the Work is done with great accuracy, and even a careless workman-cannot possibly miss the t center.
By raising the centering-leg my dividers can I.
nation with the main legs B B', substantially as and for the purpose described.
l 2. Passing the centerii'lg-leg through the head ofthe dividers, substantially as and for the purpose specified.
S. ADDISON SHURTLE FF.
Witnesses:
BERNARD A. GALLIGAN, C. H. KUKLAND.
Publications (1)
Publication Number | Publication Date |
---|---|
US50173A true US50173A (en) | 1865-09-26 |
Family
ID=2119727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US50173D Expired - Lifetime US50173A (en) | Improvement in dividers |
Country Status (1)
Country | Link |
---|---|
US (1) | US50173A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2547354A (en) * | 1945-04-25 | 1951-04-03 | Worden Walter Frank | Center marking caliper |
US20030224180A1 (en) * | 2002-05-27 | 2003-12-04 | Central Glass Company, Limited | Glass for wavelength division multiplexing optical filter |
US9377281B2 (en) | 2013-12-23 | 2016-06-28 | James Dankowski | Precision tool for locating center lines in geometric shapes |
-
0
- US US50173D patent/US50173A/en not_active Expired - Lifetime
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2547354A (en) * | 1945-04-25 | 1951-04-03 | Worden Walter Frank | Center marking caliper |
US20030224180A1 (en) * | 2002-05-27 | 2003-12-04 | Central Glass Company, Limited | Glass for wavelength division multiplexing optical filter |
US9377281B2 (en) | 2013-12-23 | 2016-06-28 | James Dankowski | Precision tool for locating center lines in geometric shapes |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US50173A (en) | Improvement in dividers | |
US85372A (en) | Improvement in pipe and faucet-clamp | |
US86308A (en) | Robert e | |
US85430A (en) | Improvement in combined beam-compass and calipers | |
US56164A (en) | Improved tool for adjusting lathes to turn tapering shafts | |
US47824A (en) | Improvement in carpenters gages | |
US76584A (en) | Improvement in vises | |
US94968A (en) | Improved gauge for turning bevels | |
US47265A (en) | Improvement in crutches | |
US772334A (en) | Calipers. | |
US1024530A (en) | Watchmaker's tool. | |
US225436A (en) | Dividers | |
US831354A (en) | Pivot-joint. | |
US52715A (en) | Improved tool for cutting gas-pipes | |
US641380A (en) | Automatic machine-chuck. | |
US92545A (en) | Improved watch-makers lathe | |
US634911A (en) | Thermostat. | |
US68998A (en) | la vet | |
US643080A (en) | Gear-tooth calipers. | |
US74356A (en) | Improvement in combined square and gauge | |
US53368A (en) | Improvement in drill-chucks | |
US380740A (en) | Surface-gage | |
US79509A (en) | smith | |
US80770A (en) | kussell | |
US672424A (en) | Calipers and dividers. |