FR2574023A3 - TELESCOPIC POINT COMPASS - Google Patents

Abstract

THE COMPASS ACCORDING TO THE INVENTION INCLUDES TWO ARTICULATED ARMS IN A CLASSIC WAY. ON ONE OF THESE TWO ARMS IS MOUNTED, BY MEANS OF A FORK CONNECTION PART 9, 10, A TERMINAL ELEMENT 7 INCLUDING A BODY 8 PROVIDED WITH A CAVITY 12 LOCKING A SPRING 13 AND EXTENDED BY A GUIDANCE ELEMENT 15. IN THIS GUIDING ELEMENT 15 SLIDES A PIN 14 WHOSE HEAD IS SOLICITED BY THE SPRING 13. THIS PIN 14 CAN BE LOCKED BY A SCREW 16. THE INVENTION MAKES A CONSIDERABLE EASY TO ADJUST THE POINT OF THE COMPASS.

Description

- 1 -

COMPASS WITH TELESCOPIC POINT.

  The present invention relates to a compass with telescopic tip

  that the combination and conformation of the elements

  constituent parts give it particular properties.

advantageously.

  In the most advanced compasses available on time

  current market, with the tip constituting the rotational axis

  tion of the instrument when it is used, is

  of this instrument by means of a small bolt which immobilizes said tip by acting on the section of the guide. This system, however, has drawbacks resulting from the fact that the deformation of the guide, which should be of an elastic nature, often becomes permanent and causes the

blocking said guidance.

  In addition, when it is necessary to lengthen or shorten the tip of the compass, the operator often faces difficulties because the disassembly of it often requires the use of tools provided for this purpose. The object of the invention is to provide a compass equipped with a

  point which makes it possible to obviate the drawbacks mentioned

  above. To achieve these results, the invention proposes a compass consisting of two arms articulated close to the operating member, with a setting element interposed between said arms, this compass being characterized in that on one of its arms is mounted a terminal element comprising a body provided with a cavity housing elastic means which are intended to act on a pin slidably mounted in

  guiding means integral with the body, and a screw which cooperates with

  re with said pin to ensure its immobilization.

  The invention is further illustrated by way of purely illustrative example with reference to the accompanying drawings, of which: FIG. 1 is a front view of a compass according to the invention; and FIG. 2 is a sectional view of an end element

  equipping the compass shown in Figure 1.

  In these figures, the compass according to the invention, generally

  designated by reference 1, comprises two arms 2 and 3

  4 in the vicinity of the actuator 5.

  An opening adjusting element 6 is disposed between the

  said two arms and holds these arms 2 and 3 in a posi-

pre-established spacing.

  On the arm 2 of the compass is mounted a terminal element 7.

  This element 7 (see FIG. 2) is constituted by a hollow body 8 (cavity 12), one end of which carries a fork 9

  intended to be articulated in 10 on the arm 2 of the compass.

  Fixing this fork 9 on the body 8 is ensured

by a locking screw 11.

  Inside the cavity 12 is housed a spring 13 which bears on the head 17 of a pin 14 mounted sliding

in a guide element 15.

  A locking screw 16 is positioned perpendicularly to the guide member 15 and cooperates with the pin 14

  to immobilize it in a pre-established position.

  The loosening of the screw 16 automatically causes the exit of the pin 14 under the thrust effect exerted by the

  spring 13 on the head 17 of said pin.

  Thus, the operator can, at any time, vary the setting

  telescopic pin 14 in a very easy way.

Claims (1)

Patent claim   Compass constituted by two arms (2) and (3) hinged at (4) near the actuating member (5) with an adjusting element (6) interposed between said arms, characterized in that on the arm (2 ) is mounted a terminal element (7) comprising a body (8) provided with a cavity   (12) accommodating resilient means (13) for biasing   a pin (14) slidably mounted in a guide element (15), said pin (14) cooperating with a screw (16) which ensures the blocking.