Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B43—WRITING OR DRAWING IMPLEMENTS; BUREAU ACCESSORIES
  • B43K—IMPLEMENTS FOR WRITING OR DRAWING
  • B43K8/00—Pens with writing-points other than nibs or balls
  • B43K8/16—Pens with writing-points other than nibs or balls with tubular writing-points comprising a movable cleaning element
  • B43K8/18—Arrangements for feeding the ink to the writing-points

Definitions

• the invention relates to a tracer device for a stylus with a tubular tip of the type comprising an ink supply network, from a reservoir towards the tip, and an ink flow regulation network.
• the purpose of the regulation network is to establish a connection between the interior of the tracer device and the external environment. During the tracing, it makes it possible to replace by air the quantities of ink used and to compensate for the phenomena of pressure and depression inside the device caused by the variations of temperature acting on the device.
• this network is in the form of a ramp formed by a helical thread placed in the inner bore or outside of a part of the device.
• the principle of filling such a network is based on the principle of capillarity and compensation of internal and external pressures.
• patent FR-2502067 of December 28, 1981 describes a stylographer with a writing tip comprising an external body constituting the envelope of the pen, an intermediate body provided with an external thread forming a first regulation ramp and an internal body provided with an external thread constituting a second regulation ramp.
• the external control ramp with the internal control ramp and with the main ink supply network and the compensation network thus formed communicates with the outside environment.
• the tracer devices of the state of the art are moreover provided with an internal counterweight which can be assisted by a coil spring making it possible to absorb the vertical accelerations to which they are subjected.
• This weight has a relatively large weight and occupies a certain volume inside the device, in particular in hand-held stylographs for which the principle of action of the weight is gravity.
• the object of the present invention is to present a tracer device for a stylograph with a tubular tip which does not have the drawbacks of the state of the art.
• the tracer device according to the invention comprises an external body provided with a thread defining an external regulation ramp and constituting the external envelope of said device, an intermediate body provided with a thread defining an internal regulation ramp, an inner body and a tracer feather connected to a flyweight.
• the internal body is constituted by a sheath made of elastomeric material having an internal chamber constituting the main ink supply network and in which a counterweight is arranged.
• the inner sheath is extended at its end closest to the tracer pen by a continuity forming a spring.
• the counterweight is a tubular counterweight provided with a bearing surface. This characteristic allows the counterweight to no longer work solely in gravity since the accelerations are absorbed by the spring of the elastomer sheath. This makes it possible to significantly reduce the size of the counterweight which is in the form of a tube with a diameter along the very small cross section.
• the intermediate body of the device is provided with lugs; the spring of the elastomer sheath presses the bearing surface of the tubular counterweight against these pins.
• the spring has a square or rectangular cross section.
• the spring has a roughly semi-circular cross section.
• the spring can also be perforated around its periphery.
• the material constituting the elastomer sheath is chosen from the most flexible materials used in the state of the art.
• FIG. 1 represents a cross-sectional view of the tracer device according to the invention
• FIG. 2 represents a cross-sectional view of the external body constituting the envelope of the device
• FIG. 3 represents a cross-sectional view of the intermediate body
• FIG. 4 represents a cross-sectional view of the elastomer sheath
• the tracer device (1) for a stylist with a tubular point consists of an external body (2) constituting the envelope of the device and provided with a helical internal thread with trapezoidal section (20), d '' an intermediate body (3) provided in the same way with a helical internal thread with trapezoidal section (30), a sheath made of elastomeric material (4) and a tracer feather (7) in which a wire slides ( 6) secured to a tubular counterweight (5).
• the outer body (2) consists of a cylindrical part provided with a thread (20) defining an internal chamber (21).
• a transverse stall (23) forms inside this internal chamber (21) an internal cylinder (22) communicating the ink reserve (12) and the internal chamber (21).
• the intermediate body (3) is constituted by a cylinder having on the one hand, a narrow part (34) and on the other hand, a wide part (33).
• This cylindrical part determines an end chamber (37) in the narrow cylindrical part (34) and an internal chamber (31) in the wide cylindrical part. Over the major part of its length, the wide cylindrical part is provided with a helical internal thread (30) with trapezoidal section delimiting the internal chamber (31).
• REPLACEMENT SHEET this thread leads to an orifice (39) in the upper part of the intermediate body.
• the wide cylindrical part (33) is moreover provided in its lower zone with an orifice (40), with a venting orifice.
• the narrow cylindrical part (34) delimits an end chamber (37) connected to an internal chamber (31) by a constriction (35) delimiting a conical space (36).
• the elastomer sheath (4) consists of a part comprising several cylindrical sections of different diameters, a narrow cylinder (60) delimiting a narrow internal chamber (63), a median cylinder (61) delimiting a median internal chamber (64), a large cylinder (62) delimiting a large internal chamber (65) and a spring
• the large cylinder (62) is connected to the central cylinder (61) by a stop (661.
• the central cylinder (61) is connected to the narrow cylinder (60) by a recess (67).
• the central cylinder is moreover provided in its lower part of an orifice (68).
• the wire (6) is secured to the flyweight. tubular (5) and the spring (69) of the astomeric sheath (4) presses the seat '8) of the tubular weight (5) against the pins (38) so that the wire (6) is positioned correctly at pen level
• the tracer pen (7) is placed inside the end chamber (3V).
• the assembly constituted by the sheath (4) e J the tubular weight (5) e J. the wire (6) is introduced into the lower part of the intermediate body (3) so that the bearing surface (8) comes to rest on the ergcts (38).
• the counterweight wire (6) is guided inside the throttle (35) and is correctly positioned at the level of the pen (7).
• the thread '30) of the intermediate body (3) on the one hand, and the outer surface of the median cylinder (61) of the sleeve (4) delimits the internal re reg of ink flow regulation (9).
• the orifice (68) of the sleeve (4) comes opposite with the lower end of the chamber
• the resulting assembly is forcibly driven inside the body
• REPLACEMENT SHEET exterior (2) The internal thread (20) of this external coips (?) As well as the external surface of the cylindrical laige part (33) of the intermediate body (3) constitute an external regulation ramp (10).
• the annular stop (32) of the intermediate body (3) comes to bear on the inner end (80) of the outer body (2).
• the orifice (39) of the intermediate body (3) faces the end of the chamber (21) thus making the internal regulation ramp (9) and the external regulation ramp (10) communicate.
• the orifice (40) of the intermediate body (3) comes opposite with the end of the chamber (21) making communicate the external regulation ramp (10) with the airing orifice ( 11).
• the external regulation ramp (10) and the internal regulation ramp (9) form the regulation network.
• the very high vertical accelerations to which the counterweight (5) is subjected are absorbed to a satisfactory extent by the elastomeric nature of the spring (69).
• Figures 5,6 and 7 show different variants of springs that can be used in place of the spring (69) described in Figures 1 and 4.
• the spring has a coarse cross section in a half moon; according to figure 6 in trapezoid and according to figure 7 in semicircle.
• the spring consists of rings interconnected.

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• Pens And Brushes (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=9397814

Family Applications (1)

Country Status (3)

Family Cites Families (4)

• 1990
  • 1990-06-20 FR FR9007703A patent/FR2663589A1/fr active Pending
• 1991
  • 1991-06-03 EP EP19910911155 patent/EP0487677A1/de not_active Withdrawn
  • 1991-06-03 WO PCT/FR1991/000440 patent/WO1991019616A1/fr not_active Ceased

Non-Patent Citations (1)

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