US3657822A - Drawing head for use in drawing devices - Google Patents

Drawing head for use in drawing devices Download PDF

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Publication number
US3657822A
US3657822A US57132A US3657822DA US3657822A US 3657822 A US3657822 A US 3657822A US 57132 A US57132 A US 57132A US 3657822D A US3657822D A US 3657822DA US 3657822 A US3657822 A US 3657822A
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US
United States
Prior art keywords
axle
flat member
head
washer
hub
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
US57132A
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English (en)
Inventor
Evgeny Mikhailovich Perminov
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Individual
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Individual
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Filing date
Publication date
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Application granted granted Critical
Publication of US3657822A publication Critical patent/US3657822A/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

  • ABSTRACT A drawing head for use in dr00035in which a first flat member is, along with spherical bodies, integral with a bracket which connects the member with an arrangement used to move the head in the plane of a drafting board, and is rigidly fixed to a hub accommodating an axle.
  • a second flat member is rigidly fixed to the axle and has cavities corresponding to the spherical bodies.
  • the arrangement used to turn one flat member relative to the other member includes two washers mounted on the hub one above the other. With the first washer resting upon tappets disposed in openings in the first flat member, and resting upon the surface of the second flat member, and the second washer is mounted stationarily in the axial direction.
  • a lever Arranged between the washers is a lever which acts upon the first washer in the course of its interaction with a springloaded clamp disposed in the casing of the head.
  • the drawing heads are connected with carriages moving along guides, or in drawing devices in which the drawing heads are moved by means of a parallelogram system.
  • drawing heads for use in drawing devices, in which the first fiat member having spherical cavities disposed on the surface thereof is connected through the intermediary of a bracket with an arrangement used to move them in the plane of the drafting board, for instance a carriage moving along guides.
  • the other flat member is rigidly fixed to the drawing scales and to a hub accommodating an axle, with the hub being fixed in the casing of the head. Both the first and the second members are mounted on the axle.
  • the second flat member has through openings to receive spherical bodies interacting with the spherical cavities of the first fiat member and the spherical bodies are essentially balls.
  • the axle has an arrangement disposed thereon and used to turn one flat member relative to the other.
  • the arrangement includes a spring-loaded push button and a pressure disc mounted on the axle in such a manner that the spring-loaded push button is disposed at one side of the axle, while the pressure disc is positioned at the opposite side of the axle under the second flat member.
  • the known drawing head does not ensure suflicient rigidity of fixation of the flat member connected with drawing scales with the flat member connected with the arrangement used to move the drawing head in the plane of the drafting board, which has a substantially great adverse effect on the precision of operation.
  • This non-reliable fixation is due to the fact that the balls are pressed in the respective cavities by the direct force of a resilient member, and in this particular head by a compression spring mounted on the axle. As the balls interact with the cavities only by a part of the sphere whose height is much smaller than its radius, the balls, by overcoming the force of the spring, can easily leave the cavities under the action of a radial force arising as a result of contact of the drawing tool of the designer with the working edges of the drawing scales.
  • the drawing head has a spring of a greater rigidity installed therein, it will be more difficult for the designer to effect control over the turning of the drawing head.
  • the push button disposed directly on the axle of the drawing head, it is more inconvenient for the designer to control the drawing head.
  • the main object of the present invention is to provide a drawing head to be used in drafting machines, in which the arrangement used for turning one flat member relative to the other provides for a rigid fixation of one flat member with respect to the other, as well as for a high precision of the tum-
  • a drawing head for use in drawing devices in which the first fiat member connected through the intermediary of a bracket with an arrangement used to move it in the plane of the drafting board, and the second flat member connected with drawing scales, are mounted on an axle arranged in a hub and lodged in the head casing, with the position of the first flat member being fixed relative to the second member by spherical bodies positioned therebetween, and the axle having an arrangement disposed thereon and used to turn one of the members relative to the other member, characterized in that the first flat member along with the spherical bodies is integral with the bracket and rigidly fixed to the hub accommodating the axle, and the second flat member is rigidly fixed to the axle and is provided
  • the spring-loaded clamp as a wedge movable in a transverse direction relative to the axle and being slidable by its wedge-shaped surface along an insert positioned on the axle above the hub and interacting by its butt end face with the lever.
  • This embodiment of the spring-loaded clamp provides for a rigid connection of the second flat member with the first member, as well as for its convenient disposition on the drawing head.
  • FIG. 1 shows a general view of the drawing head according to the present invention
  • FIG. 2 is a view taken along line 11-11 of FIG. 1, the view looking in the direction of the arrows and being on scale;
  • FIG. 3 is a view taken along line IIIIII of FIG. 2, the view looking in the direction of the arrow, and
  • FIG. 4 is an enlarged view looking in the direction of arrow A of of FIG. 1, and being partly in elevation and partly in section.
  • a drawing head 1 (FIG. 1) is mounted on a bracket 2 which is connected with an arrangement 3 used to move the head 1 in the plane of a drafting board (not shown in the drawings), with the arrangement being in this particular case, a carriage moving along a guide 4.
  • the bracket 2 is made integral with a first flat member 5 and this embodiment considerably simplifies the design of the head.
  • An opening is provided in the member 5 and a hub 6 (FIG. 2) is inserted therein and rigidly fixed to the member.
  • An axle 7 passes through the hub 6 and disposed in the member 5 over a preset radius from the axle 7 are spherical bodies which, in this particular case, are balls 8.
  • the balls are securely embraced by the material of the bracket 2 along the whole surface thereof to a depth exceeding the radius of the balls 8.
  • the flat member a is essentially a dividing member of the drawing head 1.
  • the disc 9 has an annular salient groove disposed on the surface thereof defined by a continuous row of spherical cavities l2 spaced from the center of the axle 7 over the same radius as the balls 8 of the flat member 5. The angle between two adjacent cavities 12 is equal to 5, which increases the number of fixed positions of the drawing scales 1 l.
  • a casing 15 accommodating an arrangement used for turning the flat member 9 relative to the flat member 5.
  • the arrangement includes two washers l6, 17 disposed on the hub 6 one above the other.
  • the washer 16 is loosely fitted on the hub 6 and rests upon tappets I8 lodged in openings 19 in the first flat member 5, with the tappets in this particular case being balls.
  • the washer I7 is stationarily fixed in the axial direction, and for which purpose the hub 6 has a locking ring 20 mounted thereon.
  • a lever 21 is positioned between the washers 16 and 17 and acts upon the washer 16 in the course of its interaction with a spring-loaded clamp 22.
  • the lever 21 is defined by a clip having ends 23 (FIG. 3) disposed in slots 24 (FIG. 4) provided in the washer 17.
  • the spring-loaded clamp 22 is essentially a wedge 25 movable in a transverse direction relative to the axle 7.
  • the wedge is rigidly fixed to a button or operating member 26 which extends through a slot 27 formed in side of the the casing 15.
  • the wedge 25 has a U-shaped cross section and is springloaded by a spring 28. By its wedge-shaped surface, the wedge 25 rests upon an insert 29 having chamfers with the aid of which it interacts with the wedge-shaped surface of the wedge 25 and the insert is disposed on the axle 7 above the hub 6.
  • the surface of the first flat member has a recess 30 which receives the second fiat member 9 having a circular chamfer 31.
  • the drawing head for use in a drawing device operates as follows:
  • the button 26 can be positioned at any angle relative to the drawing scales 11, by loosening the nut 14, turning the casing 15 of the head about the axle 7 through such an angle when the button 21 occupies the most convenient position for the designer, and tighten the nut 14 on the clutch 13.
  • a drawing head for use in drawing devices, comprising means to move the head in the plane of a drafting board, a bracket connecting the drawing head to said means; a first flat member having spherical bodies; said member being integral with said bracket; a hub rigidly fixed to said first flat member; an axle extending through said hub; a casing for the head having said axle mounted therein; a second flat member rigidly fixed to said axle and having cavities corresponding to said spherical bodies; a second arrangement to turn the second fiat member relative to the first one, said second arrangement being disposed on said axle and comprising a first washer positioned on said hub, a second washer positioned above said first washer on said hub stationarily relative to the latter in an axial direction, tappets disposed in openings in said first fiat member upon which said first washer rests; said tappets resting upon said second flat member, a spring-loaded clamp accommodated in said casing, and a lever positioned between said washers and acting on said first washer in the course of its interaction with said spring
  • the spring-loaded clamp is essentially a wedge movable in a transverse direction relative to the axle, and an insert disposed on the axle above the hub along which the wedge-shaped surface of the wedge is slidable, and interacting with its butt end face with the lever.
US57132A 1969-08-14 1970-07-22 Drawing head for use in drawing devices Expired - Lifetime US3657822A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SU1358215A SU286697A1 (ru) 1969-08-14 1969-08-14 Делительна головка

Publications (1)

Publication Number Publication Date
US3657822A true US3657822A (en) 1972-04-25

Family

ID=20447170

Family Applications (1)

Application Number Title Priority Date Filing Date
US57132A Expired - Lifetime US3657822A (en) 1969-08-14 1970-07-22 Drawing head for use in drawing devices

Country Status (5)

Country Link
US (1) US3657822A (fr)
BE (1) BE754904A (fr)
FR (1) FR2058071A5 (fr)
GB (1) GB1309416A (fr)
SU (1) SU286697A1 (fr)

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1012539B (de) * 1956-08-13 1957-07-18 Heinrich Moeckel Zeichenkopf fuer Zeichenmaschinen

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1012539B (de) * 1956-08-13 1957-07-18 Heinrich Moeckel Zeichenkopf fuer Zeichenmaschinen

Also Published As

Publication number Publication date
DE2037715A1 (de) 1971-04-08
GB1309416A (en) 1973-03-14
BE754904A (fr) 1971-02-15
FR2058071A5 (fr) 1971-05-21
SU286697A1 (ru) 1976-05-25
DE2037715B2 (de) 1975-12-04

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