FR2843560A1 - Ellipse tracing device comprises a simple mechanical arrangement of two base plates, with grooves, sliders, ruler and marker with which ellipses can be marked out - Google Patents

Abstract

Device for tracing ellipses comprises a main plate (1) with a recess along which a second plate (3) slides. A T-shaped groove (10, 11) is formed in the two plates and two sliders (12, 13) are mounted in it. A ruler is mounted on the sliders.

Description

i Device for Tracing Ellipses The present invention

  relates to devices for tracing

ellipses of all sizes.

  Figure (1) is a top or plan view. Figure (2) is a front view and Figure (3) is a side or side view.

  The three figures represent the same embodiment of a

  device according to the invention making it possible to trace the ellipses.

  The same references designate the same elements there, whatever

  are the figures on which they appear.

  To fully understand how this device works, you need this

  refer to the illustrated figures (1) (2) (3) Pages 1/2 and 2/2.

  This device includes a main sole (1) [8 cm wide and 2.5 cm thick] with a notch (2) in the middle into which a second sole (3) [5 cm wide and 1.2 cm slides. 15 thick] at each end are fixed feet (4) and (5) by 4 screws (6) (7) (8) (9) In these two flanges is made a T-shaped guide groove ( 10) and (11) This device also comprises a set of two slides (12) 20 (13) able to move in translation without play in the guide grooves (10) (11) A rule (14) is the means for block said rule to the holding heads (15) (16) pivotally mounted each around an axis perpendicular (17) (18) to the plane formed by two slides (12) (13) and 25 of means for blocking two heads on the ruler by two knurled screws

(19) (20)

  Finally the rule supports tracing means, for example a pencil

  or a pen (21) mounted on the head (22) or any other marking means chosen as a function of the nature of the surface on which the elliptical curve is to be drawn.

  The sole (1) must be firmly fixed on the surface to be traced so that it does not move when the sole (3) moves to let the head (22) and its marking means (21) pass. draw elliptical figures long axis and 35 small axis for schoolchildren and national education, we can trace larger by 2 m by 1.50 m for cabinetmakers and mirror makers and even larger, 10 m or even 20 m and more. This requires soles and a longer ruler and reinforce all of the pieces. What could be

  used in aeronautics, planes and boats.

Claims (2)

claims   1) Device for tracing ellipses characterized in that it consists of a main sole (1) with a notch (2) in the middle of which a second sole (3) slides, a T-shaped groove ( 10) and (11) being produced in these two soles where two slides (12) and (13) are housed moving in   translation, to fix the rule (14).   2) Device for drawing ellipses according to claim 1 characterized in that the rule (14) is held by two holding heads (15) and (16) pivotally mounted each around a perpendicular axis (17) (18) to the plane formed by the two slides (12) and (13).