US3842508A - Draftsman compasses - Google Patents

Draftsman compasses Download PDF

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Publication number
US3842508A
US3842508A US00307310A US30731072A US3842508A US 3842508 A US3842508 A US 3842508A US 00307310 A US00307310 A US 00307310A US 30731072 A US30731072 A US 30731072A US 3842508 A US3842508 A US 3842508A
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US
United States
Prior art keywords
links
inverted
shaped member
legs
pair
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
US00307310A
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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
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Publication of US3842508A publication Critical patent/US3842508A/en
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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
    • B43L9/20—Pivots

Definitions

  • the present invention relates in general to pairs of compasses for draftsmen and has specific reference to improvements in the pivotal connection of the two legs of the compasses, which is designed to permit angular opening and closing movements of the compass legs that are symmetric in relation to the longitudinal axis of the gripping knob usually provided at the top of the head or inverted U-shaped member in which the two compass legs are hingedly interconnected.
  • Pairs of compasses comprising hinge means of this I character are already known, wherein a pair of links are each pivoted at one end to a respective compass leg and at the opposite end to each other through linkage means guided in grooves formed in the lateral two legs or branches of said inverted U-shaped member, said groove extending parallel to said longitudinal axis of the gripping knob.
  • the draftsman compasses according to this invention which comprise an inverted U-shaped member provided with a gripping knob extending in a direction opposite to that of the two lateral branches of said inverted U-shaped member, a pair of legs each provided at one end with a circular flange somewhat thinner than the leg proper and formed with a central hole, the circular flanges of said legs being disposed between the lateral branches of said inverted U-shaped member and pivoted thereto by means of a screw extending in succession through a hole formed in a first one of said lateral branches, a hole formed centrally of a first spacing washer, the central holes of said pair of circular flanges, a hole formed centrally of a second spacing washer, and finally a tapped hole formed through the second lateral branch of said inverted U- shaped member, said tapped hole being axially aligned with the hole in said first lateral branch, said first and second spacing washers providing gaps between said first lateral branch and the circular flange adjacent thereto and between the second
  • the present invention provides a concave deformable quadrilateral which, in combination with the arcuate shape of the links, not only reduces the over-all dimensions of the hinge system but confines said links within the contours of the two lateral branches of said inverted U-shaped member in order to conceal or substantially conceal said links irrespective of the angular position of the compass legs.
  • FIG. 1 is a part-sectional and fragmentary elevational view of the compass in its closed position
  • FIG. 2 is a cross-section taken along the line lI-II of FIG. 1;
  • FIG. 3 is a view similar to FIG. 1 but'showing the compass in its open position
  • FIGS. 4 and 5 are detail views showing a modified embodiment of the pair of guide links.
  • the compass legs 1 and 2 of the draftsman compass are pivotally interconnected by means of a pair of relatively thin circular flanges 1a, 2a between which a friction washer 8 is disposed.
  • These legs are assembled by means of a screw 3 extending in succession through a hole 14 formed in one of the lateral branches 5 of an inverted U-shaped member 4, a hole formed centrally of a first spacing washer 11, holes formed centrally of the circular flanges 1a and 2a, and a hole formed centrally of a second spacing washer l2, and finally engaging a tapped hole 15 formed through the other lateral branch 6 and axially aligned with hole 14.
  • the spacing washers 11 and 12 are partially engaged in shallow circular recesses 17 formed centrallyof the outer faces of said circular flanges 1a and 2a.
  • a pair of flat links 9 and 10 are disposed; the lower ends of these links are pivoted to a common pivot pin 18 having its ends slidably engaged in gaged guide grooves 19 formed in the inner face of the lateral branches 5 and 6 in a direction parallel to the longitudinal axis of the gripping knob 26 of the inverted U-shaped member 4.
  • a cylindrical stud 20 Integral with each link 9, 10 on the side thereof facing the adjacent circular flange 1a or 2a, a cylindrical stud 20 is provided which engages a cylindrical blind hole 21 of corresponding diameter, formed in the outer face of the adjacent circular flange to permit movements of the link in relation thereto.
  • the blind holes 21 are formed at such eccentric locations in relation to said circular flanges, that in the closed compass leg position illustrated in FIG. 1, the pivot centre of the compass legs, which is coincident with the axis of screw 3, as viewed from one end thereof, lies within a triangle having as its vertices the two pivot points (20, 21) of the links on said circular flanges and the pivot point coincident with the axis of pin 18, as clearly shown in FIG. 1.
  • the links 9 and 10 must have an arcuate configuration in order to avoid any interference with the screw 3 and the spacing washers 11 and 12 during the opening and closing movements of the compass legs.
  • FIGS. 4 and 5 illustrate a modified embodiment of said links.
  • the links 9 and 10 comprise each at their upper end a lateral cylindrical stud as in the structure illustrated in FIGS. 1 to 3, for the pivotal connection of these links to the circular flanges la, 2a of the compass legs, said studs engaging to this end corresponding blind holes 21 (not shown in FIGS. 4 and 5) formed in said flanges, respectively.
  • said links are pivotally interconnected by means of a cylindrical stud 24 formed integrally with one of the links and engaging a cylindrical blind hole of corresponding diameter formed in the other link.
  • the links carry on their respective side opposite to the cylindrical stud 24 and to the cylindrical blind hole 25 cylindrical studs 22 and 23 axially aligned with the blind cylindrical hole 25 and with the cylindrical stud 24, respectively, and adapted to engage the guide grooves 19 formed in the inner faces of the lateral branches 5 and 6 of the inverted U-shaped member 4.
  • All the component elements of the above-described compass structure namely the inverted U-shaped member 4, legs 1 and 2, links 9 and 10, may advantageously be manufactured by injection moulding from a suitable metal alloy such as Zamac.
  • Draftsman compasses comprising an inverted U- shaped member provided with a gripping knob extending in a direction opposite to that of the lateral branches of said member, a pair of legs provided at one end with a circular flange somewhat thinner than the leg proper and formed with a central hole, the lateral branches of said inverted U-shape member having a width which has a value substantially equal to that of the diameter of said circular flanges, and having a length which is about twice the value of the diameter of said circular flanges, the circular flanges of both legs being disposed between the lateral branches of said inverted U-shaped member and a gap being left between each circular flange and the adjacent branch of the inverted U-shaped member, spacer means in each gap, a screw extending through registering holes formed in said branches, in said spacer means and in said circular flanges for pivotally connecting said pair of legs to said branches, and a pair of arcuate-shape flat links disposed in said gaps, respectively, and each pivoted at
  • each link has on the side thereof which faces the adjacent circular flange a cylindrical stud fitting in a cylindrical blind hole of corresponding diameter formed in the outer face of the adjacent circular flange for pivoting the corresponding link thereto.
  • said guided pivotal connection of said pair of links comprises a pivot pin extending through holes formed in said other ends of said links, the length of said pivot pin being sufficient to cause said pin to protrude from both side of the link assembly and to engage the guide grooves formed in the lateral branches of said inverted U-shaped member.
  • said guided pivotal connection of said pair of links comprises a cylindrical blind hole formed in a first one of said links in a side thereof which faces the other link, a cylindrical stud rigid with said other link and adapted to fit into the cylindrical blind hole of said first link, and a pair of studs rigid with said first and second links, respectively, said pair of studs projecting from side of said links which face the lateral branches of said inverted U-shaped member, respectively, and being axially aligned with said cylindrical blind hole and said cylindrical stud, respectively, for engaging said guide grooves in said lateral branches.

Landscapes

  • Pivots And Pivotal Connections (AREA)
  • Closures For Containers (AREA)
  • Chairs For Special Purposes, Such As Reclining Chairs (AREA)
US00307310A 1971-11-16 1972-11-16 Draftsman compasses Expired - Lifetime US3842508A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7140920A FR2161164A5 (it) 1971-11-16 1971-11-16

Publications (1)

Publication Number Publication Date
US3842508A true US3842508A (en) 1974-10-22

Family

ID=9085821

Family Applications (1)

Application Number Title Priority Date Filing Date
US00307310A Expired - Lifetime US3842508A (en) 1971-11-16 1972-11-16 Draftsman compasses

Country Status (5)

Country Link
US (1) US3842508A (it)
JP (1) JPS527774B2 (it)
FR (1) FR2161164A5 (it)
GB (1) GB1373457A (it)
IT (1) IT975742B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104801A (en) * 1976-11-19 1978-08-08 Helix International Limited Drawing instrument
US4156313A (en) * 1977-04-27 1979-05-29 Koh-I-Noor Rapidograph, Inc. Compass housing

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4102218C1 (en) * 1991-01-26 1992-06-11 J. S. Staedtler Gmbh & Co, 8500 Nuernberg, De Compasses for drawing circles - incorporates clamp mechanism with screw and friction surfaces

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US437411A (en) * 1890-09-30 Draftsman s compasses
US877239A (en) * 1906-11-28 1908-01-21 Georg Schoenner Compass-head.
US1708191A (en) * 1927-02-23 1929-04-09 Delco Remy Corp Locating instrument
US3358371A (en) * 1966-12-07 1967-12-19 Sr Fred H Liesong Scribing compass or divider

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US437411A (en) * 1890-09-30 Draftsman s compasses
US877239A (en) * 1906-11-28 1908-01-21 Georg Schoenner Compass-head.
US1708191A (en) * 1927-02-23 1929-04-09 Delco Remy Corp Locating instrument
US3358371A (en) * 1966-12-07 1967-12-19 Sr Fred H Liesong Scribing compass or divider

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4104801A (en) * 1976-11-19 1978-08-08 Helix International Limited Drawing instrument
US4146965A (en) * 1976-11-19 1979-04-03 Helix International Limited Drawing instrument
US4156313A (en) * 1977-04-27 1979-05-29 Koh-I-Noor Rapidograph, Inc. Compass housing

Also Published As

Publication number Publication date
GB1373457A (en) 1974-11-13
FR2161164A5 (it) 1973-07-06
DE2255522A1 (de) 1973-05-24
IT975742B (it) 1974-08-10
DE2255522B2 (de) 1976-05-13
JPS527774B2 (it) 1977-03-04
JPS4862522A (it) 1973-08-31

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