US3745662A - Bow compasses - Google Patents

Bow compasses Download PDF

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Publication number
US3745662A
US3745662A US00307295A US3745662DA US3745662A US 3745662 A US3745662 A US 3745662A US 00307295 A US00307295 A US 00307295A US 3745662D A US3745662D A US 3745662DA US 3745662 A US3745662 A US 3745662A
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US
United States
Prior art keywords
legs
disk
bow
screw
section
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
Application number
US00307295A
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English (en)
Inventor
M Gentils
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Application granted granted Critical
Publication of US3745662A publication Critical patent/US3745662A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
    • B43L—ARTICLES FOR WRITING OR DRAWING UPON; WRITING OR DRAWING AIDS; ACCESSORIES FOR WRITING OR DRAWING
    • B43L9/00—Circular curve-drawing or like instruments
    • B43L9/16—Features common to compasses, dividers, and callipers

Definitions

  • ABSTRACT A pair of bow-compasses having the upper ends of its 1301 Foreign Application Priority Data 2 assembled y a bow-Shaped SPring engaging Nov 6 197 France 7140919 notches formed externally of said ends, the inner faces of said legs comprising each a disk-shaped projection [52] Us.
  • the present invention relates in general to compasses and has specific reference to a pair of bow-compasses.
  • Known bow-compasses usually comprise two legs pivotally assembled at one end thereof, a bow-shaped clamping spring constantly holding said legs in their assembled condition, the spring ends engaging suitable notches formed in the outer faces of said legs, and a knurled control knob rigid with a central portion of a screw-rod formed with opposite screw pitches on either side of said knob and adapted to engage corresponding nuts pivotally mounted in opposite cavities formed in the relevant legs.
  • Bow-compasses according to the present invention at one end a projection having substantially the shape of a semi-circular disk projecting from the inner face of said leg, and a corresponding semi-circular slot adjacent to, and of same radius as, said semi-circular disk, and adapted to snugly receive the semi-circular disk of the other leg, the disk of each leg being constantly urged for engagement in the semi-circular slot of the other leg by the bow-shaped spring.
  • FIG. 1 is an elevational view of the bow-compasses with their legs in their open condition
  • FIG. 2 is a section taken along the line Il-II of FIG.
  • FIG. 3 is an elevational view of the bow-compasses in their closed condition
  • FIG. 4 is a section taken along the line lV-lV of FIG. 3;
  • FIG. 5 is a section showing on a larger scale the nut for the adjustment screw rod
  • FIG. 6 is a side elevational view, taken in the direction of the arrow F of FIG. 5;
  • FIG. 7 is a view similar to FIG. 6 but without the nut
  • FIG. 8 is a perspective view showing the pivoted end of a compass leg.
  • FIG. 9 is a similar view, with parts shown in section, in order better to illustrate the interfitting parts.
  • the pair of bow-compasses comprise essentially a pair of legs 1,2 carrying the one the dry point 3 and the other the pencil point 4 or the pen; these legs are hingedly or pivotally interconnected at one end by means of a pair of semi-circular disk-shaped projections 5, 6 cast directly with the legs respectively, and each adapted to snugly engage a corresponding semi-circular slot 16, of same radius and substantially same width as the semi-circular disk, and formed in each leg adjacent said semi-circular disk 5 or 6, to permit the mutual engagement or interfitting of said semi-circular disks 5, 6 without any lateral play.
  • the compass legs are kept in this mutual engagement by a bow-shaped spring 7 carrying externally of its top surface a knurled gripping knob 17, the spring ends 8 engaging respective notches 9 in the outer faces of the legs 1 and 2 (see FIGS. 2, 8 and 9).
  • each leg 1, 2 has formed intermediate its ends an aperture 10 of rectangular crosssection adapted to receive a nut 11 of plastic material such as Nylon or Delrin, pivotally mounted to a transverse pivot pin 12 of elongated cross-section.
  • a nut 11 of plastic material such as Nylon or Delrin
  • Each nut which may be, as shown, integral with the associated leg, is engaged by the corresponding end of a screw-rod 13 carrying a central knurled control knob 14 rigid therewith, the screw-threaded portions of this screw-rod which extend on either side of said knob 14 having opposite pitches, as customary in the art.
  • Each nut 11 has formed therein a radial slot 15 of a width equal to, or slightly greater than, the minor dimension of the elongated cross-section of said pivot pins 12, the major dimension of this cross-section being definitely greater than the width of said slot 15.
  • Bow-compasses comprising a pair of legs pivotally assembled at one end thereof, each leg comprising at one end thereof a notch formed in its outer face and a disk portion of semi-circular configuration projecting from its inner face, and adjacent to said disk a semicircular slot of same radius and substantially the same width as said disk for receiving the semi-circular disk of the other leg, a bow-shaped spring for constantly holding said legs in their assembled condition with their semi-circular disks fitted into the relevant semi-circular slots, the spring ends engaging the notches formed on the outer faces of said legs, respectively, and a knurled control knob rigid with a central portion of a screw-rod having screw-threaded portions of opposite pitches disposed on either side of said knob, and nuts receiving the threaded ends of said screw-rod and pivotally ting thereof on said pivot pin, the width of said radial slot being slightly greater than the minor dimension of the elongated cross-section of said pivot pin and smaller than the major dimension of said section.

Landscapes

  • Orthopedics, Nursing, And Contraception (AREA)
  • Gripping Jigs, Holding Jigs, And Positioning Jigs (AREA)
  • Prostheses (AREA)
  • Pivots And Pivotal Connections (AREA)
  • Mutual Connection Of Rods And Tubes (AREA)
  • Rehabilitation Tools (AREA)
US00307295A 1971-11-16 1972-11-16 Bow compasses Expired - Lifetime US3745662A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7140919A FR2161163A5 (fr) 1971-11-16 1971-11-16

Publications (1)

Publication Number Publication Date
US3745662A true US3745662A (en) 1973-07-17

Family

ID=9085820

Family Applications (1)

Application Number Title Priority Date Filing Date
US00307295A Expired - Lifetime US3745662A (en) 1971-11-16 1972-11-16 Bow compasses

Country Status (6)

Country Link
US (1) US3745662A (fr)
JP (1) JPS527773B2 (fr)
DE (2) DE2264990C2 (fr)
FR (1) FR2161163A5 (fr)
GB (1) GB1366023A (fr)
IT (1) IT975741B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106200A (en) * 1976-02-02 1978-08-15 David Maxwell Marker compass
US20050079079A1 (en) * 2003-10-09 2005-04-14 Wahlin Sigvard J. Dilution system
CN108656801A (zh) * 2018-05-08 2018-10-16 吴烁 一种应用于教育教学的数学教学用辅助教学装置

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2718627C2 (de) * 1977-04-27 1981-04-16 Rotring-Werke Riepe Kg, 2000 Hamburg Zirkelkopf für einen Federbügelzirkel
DE3207991C2 (de) * 1982-03-05 1984-08-09 Fa. J.S. Staedtler, 8500 Nürnberg Zirkel mit Einstellspindel
DE3838473C1 (en) * 1988-03-15 1989-06-01 Intertech Zeichengeraete Guenther Partes Kg, 8535 Emskirchen, De Fine adjustment compass
DE4411828A1 (de) * 1994-03-31 1995-10-05 Reimar Koerth Teilzirkel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE176441C (fr) *
US335740A (en) * 1886-02-09 Assigfoe to
DE356998C (de) * 1922-08-11 Reisszeugfabrik Pfronten Teilzirkel
US3110111A (en) * 1960-08-01 1963-11-12 Frank C Pachter Quick adjusting means for relatively positionable members

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1461568A1 (de) 1963-04-10 1969-01-02 Clemens Riefler Fabrik Mathem Zirkel mit einer beide Schenkel einstellbar miteinander verbindenden Spindel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE176441C (fr) *
US335740A (en) * 1886-02-09 Assigfoe to
DE356998C (de) * 1922-08-11 Reisszeugfabrik Pfronten Teilzirkel
US3110111A (en) * 1960-08-01 1963-11-12 Frank C Pachter Quick adjusting means for relatively positionable members

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4106200A (en) * 1976-02-02 1978-08-15 David Maxwell Marker compass
US20050079079A1 (en) * 2003-10-09 2005-04-14 Wahlin Sigvard J. Dilution system
CN108656801A (zh) * 2018-05-08 2018-10-16 吴烁 一种应用于教育教学的数学教学用辅助教学装置

Also Published As

Publication number Publication date
IT975741B (it) 1974-08-10
DE2264990A1 (de) 1975-10-30
DE2264990C2 (de) 1982-03-25
GB1366023A (en) 1974-09-04
JPS4862521A (fr) 1973-08-31
DE2255521C3 (de) 1979-08-30
FR2161163A5 (fr) 1973-07-06
DE2255521A1 (de) 1973-06-14
DE2255521B2 (de) 1976-12-16
JPS527773B2 (fr) 1977-03-04

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