US3758953A - Drawing-board protractor unit - Google Patents

Drawing-board protractor unit Download PDF

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Publication number
US3758953A
US3758953A US00177411A US3758953DA US3758953A US 3758953 A US3758953 A US 3758953A US 00177411 A US00177411 A US 00177411A US 3758953D A US3758953D A US 3758953DA US 3758953 A US3758953 A US 3758953A
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US
United States
Prior art keywords
disc
slide member
indexing
arm
knob
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
US00177411A
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English (en)
Inventor
A Bruneau
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.)
Alpia SA
Original Assignee
Alpia 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 Alpia SA filed Critical Alpia SA
Application granted granted Critical
Publication of US3758953A publication Critical patent/US3758953A/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
    • B43L13/00—Drawing instruments, or writing or drawing appliances or accessories not otherwise provided for
    • B43L13/02—Draughting machines or drawing devices for keeping parallelism
    • B43L13/08—Protractor heads

Definitions

  • protractor units which comprise notably a scale plate bearing a 360 graduation, adapted to be detent-positioned every and also to be locked in any desired intermediate position. It is also known to provide scales registering with the graduated disk, such as adjustable verniers revolving with the disk and adapted to be locked in any desired intermediate position. These protractor units are intended for a more rational use and make it unnecessary to calculate angle conversion, notably in perspective drawing.
  • the supporting member was ex tremely expensive to manufacture due to the various machining operations and time necessary for assembling the parts. Besides, the noise generated by the frictional contact between metallic elements, and also the weight of the unit constitute a nuisance for the user.
  • a circular fixed support comprising a single piece of material having disposed on either side said first and second movable portions, a central aperture in said support, a hub extending through said aperture and rigid with said first and second movable portions, a toothed wheel formed bodily with said support and surrounding coaxially said central aperture, an annular cavity formed between the outer peripheral edge and said toothed wheel, a disk secured to the front face of said toothed wheel and projecting beyond the outer diameter of said wheel, and locking means carried by said second movable portion and bearing against said last named disk for holding said two movable portions against motion in relation to said support.
  • said scales are graduated on a metal element cemented to said support.
  • FIG. 1 is a plan view from above of the protractor unit according to this invention, the grip being removed therefrom;
  • FIG. 2 is a section taken along the broken line lIlI of FIG. 1, showing the protractor unit with its grip;
  • FIG. 3 is a section taken along the line III-III of FIG. 1, showing means for locking the graduated disk at any desired location in relation to the associated scales, and
  • FIG. 4 is a plan view from above of a modified form of embodiment of a support for a protractor unit provided with an adjustable Vernier.
  • This support 1 of substantially circular configuration has formed in its lower portion stiffening ribs 6 and in its upper portion a toothed wheel 7 formed in turn with a central aPerture adapted to receive the hollow hub 2.
  • This wheel comprises for example twenty or twenty four peripheral teeth of which the lower portions 9 are an integral part of the support 1.
  • An annular cavity 11 is formed between the teeth 8 and the outer peripheral edge 10 of support 1, for a purpose to be explainedpresently.
  • the upper surface of wheel 7 comprises male elements 12 for positioning a disk 13 comprising female elements complementary to said male elements 12.
  • These male elements 12 may consist for example of cylindrical projections moulded integrally with the support 1.
  • the disk 13 is fitted on support 1 forming a one-piece element, notably with the toothed wheel 7 provided with said projections 12.
  • the support 1 is moulded from a relatively strong material such as Makrolon CV" (Registered Trademark), a plastic material incorporating fine glass particles.
  • detent-positioning means comprise a pair of superposed members 22 and 23 rotatably mounted about a common vertical pivot pin 24.
  • the rotation of the lower member 22 in relation to the upper member 23 is limited by the permissible movement of a stud 25 rigid with one member, for instance member 23, in a slot 26 formed in the other member, for instance 22.
  • the movable end 27 of upper member 23 constitutes a finger engaging a corresponding notch formed in the end portion 21 of link 14.
  • the latchforming lower member 22 has a hook-shaped end portion 28 engageable between the teeth 8 of wheel 7.
  • FIG. 3 shows in detail the manner in which the disk 15 is locked to the support 1 through a control knob 31.
  • This control knob 31 is rigid with a nut engaging a screw-threaded rod rigid with a shoe 32 disposed under the outer peripheral portion of disk 13. The locking action is produced by rotating the knob 31 so that the shoe 32 is clamped to the marginal portion of disk 13.
  • FIG. 4 illustrates a modified form of embodiment of a support 1 adapted to be provided along its outer peripheral portion 33 and externally of the edge 10 a pair of verniers, for example a first one 34 (FIG. 1) and another vernier (not shown) of the adjustable type, provided with means for locking same in the selected position.
  • the particular configuration of support 1 is such that it facilitates the formation along its outer peripheral portion, of arcuate slideways 35 adapted to receive the means for limiting the permissible excursion of the adjustable vernier, which means are adapted to engage stop means on an auxiliary member rigid with said support and disposed between this support 1 and the rule carrier 4.
  • the verniers are etched on metal plates, such as aluminium annular segments adapted to be subsequently cemented to the support consisting for example of Makrolon CV (Registered Trademark), as mentioned in the foregoing.
  • Fastening means 36 may also be incorporated in the support 1 for attaching the latter to an intermediate member rigid with a carriage movable along a guide track.
  • a drafting protractor comprising: a stationary member having means defining a bore therethrough; a tubular member extending through said bore and rotatable relative to said stationary member; means defining an arm connected to said tubular member externally of said bore and one side of said stationary member and rotatable with said tubular member and carrying a straightedge thereon; a disc connected to said tubular member externally of said bore and a side opposite said one side of said stationary member; a knob manually rotatable aboutan axis and connected to said disc for selectively manually indexing said disc, said tubular member and said arm; means defining a cavity in said knob; indexing means for indexing said arm in different angular positions; and locking means coacting with said indexing means for releasably locking said arm in different desired angular positions, said locking means comprising a first slide member disposed in said cavity and manually slidable axially therein and rotatable with said knob, a second slide member slidably disposed between said stationary member and said
  • indexing means comprises an integral annular protruberance of said stationary member having means defining integral teeth therearound.
  • a drafting protractor including an annular disc disposed between said disc and said indexing means, means connecting said annular disc to said indexing means, and vernier locking means for locking said arm in desired angular positions when said engaging means are disengaged from said indexing means and therefore when said arm is an unlocked angular position, said vernier locking means comprising a manually operable brake member connected to said disc, and manually operable for engaging said annular disc to prevent rotation of said disc relative to said annular disc, and manually operable means for manually operating said brake member.
  • a drafting protractor including means in said stationary member defining an arcuate slot coaxial with said aperture and spaced therefrom, means on said disc defining a scale of angles, and a vernier disposed in said arcuate slot coactable with said scale for reading thereof.
US00177411A 1970-09-10 1971-09-02 Drawing-board protractor unit Expired - Lifetime US3758953A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7032925A FR2105534A5 (fr) 1970-09-10 1970-09-10

Publications (1)

Publication Number Publication Date
US3758953A true US3758953A (en) 1973-09-18

Family

ID=9061157

Family Applications (1)

Application Number Title Priority Date Filing Date
US00177411A Expired - Lifetime US3758953A (en) 1970-09-10 1971-09-02 Drawing-board protractor unit

Country Status (6)

Country Link
US (1) US3758953A (fr)
JP (1) JPS5221922B2 (fr)
CH (1) CH543974A (fr)
FR (1) FR2105534A5 (fr)
GB (1) GB1356823A (fr)
ZA (1) ZA715821B (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4486956A (en) * 1982-01-11 1984-12-11 Alpia S.A. Control device for drawing instruments
US4495708A (en) * 1982-02-24 1985-01-29 Franz Kuhlmann Prazisionsmechanik Und Maschinenbau Gmbh & Co. Kg Drawing head for a drawing machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59190595U (ja) * 1983-06-01 1984-12-18 武藤工業株式会社 自在平行定規のヘツド

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE12824C (de) * 1900-01-01 H. HÖLSCHER in Lengerich, Westfalen Verbesserungen an einer Dütenmaschine zur Anfertigung von Papiersäcken. (IL
DE1511477A1 (de) * 1966-12-01 1969-09-11 Schmidt & Haensch Franz Schaltwerk fuer einen Zeichenkopf mit Rastenschaltung

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE12824C (de) * 1900-01-01 H. HÖLSCHER in Lengerich, Westfalen Verbesserungen an einer Dütenmaschine zur Anfertigung von Papiersäcken. (IL
DE1511477A1 (de) * 1966-12-01 1969-09-11 Schmidt & Haensch Franz Schaltwerk fuer einen Zeichenkopf mit Rastenschaltung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4486956A (en) * 1982-01-11 1984-12-11 Alpia S.A. Control device for drawing instruments
US4495708A (en) * 1982-02-24 1985-01-29 Franz Kuhlmann Prazisionsmechanik Und Maschinenbau Gmbh & Co. Kg Drawing head for a drawing machine

Also Published As

Publication number Publication date
JPS5221922B2 (fr) 1977-06-14
GB1356823A (en) 1974-06-19
FR2105534A5 (fr) 1972-04-28
ZA715821B (en) 1972-05-31
CH543974A (fr) 1973-11-15
JPS4873230A (fr) 1973-10-03

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