FR2525446A1 - STICK, ESPECIALLY COSMETIC STICK - Google Patents

Abstract

THE ELEMENT WITH NO SCREW 4 OF THE COSMETIC STICK 1 IS MOUNTED NOT TO BE MOVABLE AXIALLY BUT BE MOBILE IN ROTATION IN THE GRIPPING PART 2 AND IT IS SCREWED ON THE PISTON 3 HAVING A THREAD. PISTON 3 IS HELD MOVABLE IN ROTATION BUT SO THAT IT CAN SLIDE LONGITUDINALLY INSIDE THE GRIPPING PART 2. THEREFORE, PISTON 3 PENETRATES IN THE ELEMENT WITHOUT SCREWS 4 DURING ROTATION OF THE LAST .

Description

The present invention relates to a stick, in particular a stick

  cosmetic which comprises a gripping part containing a piston and a screw-shaped element in the form of a socket, intended to receive a body of a material which can be extended and which, while being able to rotate relative to the gripping part, is screwed on the piston

fitted with a thread.

  Already known from patent application DE 2 728 969, a stick of this type which is distinguished by its simplicity and by a small number of constituent parts which allows it to be manufactured at low cost price When using the stick , the element is rotated with a thread relative to the gripping part so that it

  advance by moving on the piston fixedly fixed to the interior

  laughing of the gripping part, the body consisting of a material that can be spread out and occupying the screw element then being advanced by following the thread on the extent thereof while the screw element gradually penetrates in rotating in the gripping part Because the screw element penetrates deep inside the gripping part when the spreadable material is almost exhausted, the user has difficulty in grasping and holding

the stick by the hand.

  The object of the present invention is to create a stick, in particular a cosmetic stick, the total length of which, that is to say that of the grip part containing the threaded element, remains unchanged despite the wear of the body. of material which can be spread out so as to allow an easy and safe handling of the stick even during a strong

  wear of the material it contains.

  The problem set out above is solved in accordance with the invention by a cosmetic stick which is characterized in that the screw thread element is retained by the grip part so as not to slide in the axial direction while the piston is kept stationary in rotation but axially displaceable inside the grip part while being guided by the latter so that the piston can penetrate inside the grip part when

  prints a rotational movement to the screw thread element.

  In the embodiment according to the invention the screw thread element can be rotated relative to the grip part but it is kept non-displaceable

  in the axial direction while the piston is held immo-

  bile in rotation but axially sliding inside the gripping part When the element is turned with a thread, for the use of the stick, the piston guided longitudinally inside the gripping part is moved towards the inside of the threaded element and pushes out the body of soft material filling the threaded element Consequently the body of material can be advanced to project from the element no screws without the length of the section of the element

  with screw thread protruding from the grip part is reduced.

  It is thus possible to easily grasp the stick even

  during advanced wear of the soft material body.

  Maintaining the threaded element inside the grip part is advantageously ensured by a snap connection which facilitates the mounting of the stick as well as the replacement of an empty threaded element by a solid element The snap connection can be achieved in a simple manner by providing on the inner wall of the gripping part a bead which cooperates with a

  annular groove provided in the screw thread element.

  Correct centering and good retention of the cosmetic stick are obtained when the internal bead of the grip part and the annular groove of the screw thread element are produced at a certain distance from the

ends of these pieces.

  It is advantageous to provide longitu-

  dinales on the inner wall of the screw thread element to prevent the body of material from rotating inside the element during a subsequent sharpening of the stick It may also be advantageous to provide for the element with internal thread a non-circular internal cross-section using a metal sleeve for this purpose; on the other hand, the grip part and the piston can be

  made of synthetic material.

  Various other features of the invention

  moreover emerge from the detailed description which follows.

  An embodiment of the object of the invention is shown, by way of nonlimiting example, in the accompanying drawing. Fig 1 shows, in longitudinal section, a stick

cosmetic according to the invention.

  Fig 2 is a longitudinal section of the element

  screw thread of the cosmetic stick according to fig 1.

  Fig 3 shows, in side elevation, the piston

cosmetic stick.

  -Fig 4 is a longitudinal section of the part

gripping.

  Figs 5 and 6 are cross sections of the screw element in the body housing area

  consisting of a material that can be spread.

  The cosmetic stick 1 shown in fig 1 is

  consisting of three parts namely by a part of pre-

  hension 2, a piston 3 housed inside the latter and by a screw thread element 4 For clarity, fig 1 does not show the closure cap to be engaged

from the left of the drawing.

  As can be seen in particular from FIG. 2, the threaded element 4 is produced in the form of a cylindrical sleeve in which is housed or produced by molding a body 5 made of a material which can be spread. This body can be constituted by a material for lipstick stick or similar material Below the housing zone 6 for the body 5 the screw element 4 has an imprint 7 making it possible, on the one hand, to produce an annular groove 8 in the outer surface of the threaded element 4 and, on the other hand, a bead 9 projecting from the inner surface of this element 4 When the threaded element 4

  is engaged in the gripping part 2, an internal bead

  térieur l O 1 produced near the upper end of the gripping part 2, penetrates in the manner of a snap connection in the annular groove 8 of the screw thread element 4 Therefore the element to no screw 4 is prevented from sliding longitudinally relative to the gripping part 2 but it can rotate in the latter The internal bead 10 can be replaced by several radial projections, but it is advantageous to provide an annular bead extending over the entire inner circumference of the gripping part 2 Both the annular groove 8 and the inner bead 10 are provided at a certain distance from the cooperating ends of the parts 2 and 4, in order to obtain good centering when the element with pitch screw 4 is engaged in the grip part The rigidity of the stick

is thus improved.

  As can also be seen in FIG. 2, the element 4 has on its inner surface a thread 11 which cooperates with a thread 12 provided on the piston 3 The thread 11 is advantageously produced by pushing back on the annular bead 9 making protrusion of the inner surface of the element 4 The thread produced by impression and without removal of chips can for example be metric and

have a pitch of 0.5 mm.

  The piston 3 is mounted by being secured in rotation

  tion but movable longitudinally in the gripping part 2 For this purpose a radial projection 13 in the form of a rib cooperating with a longitudinal rib 14 provided on the inner surface of the gripping part 2 is formed at the end of the piston 3 opposite the gripping part 2 As clearly shown in FIG. 1, the radial projection 13 covers the rib 14 of the gripping part 2 Thanks to this characteristic the piston 3 is, on the one hand, prevented from turning and, on the other hand , guided longitudinally. The operation of the cosmetic stick is as follows: when it is wished to advance the body 5 of material that can be spread out from the screw thread element 4, the latter must be rotated. Therefore the screw pitch cooperates with the thread 12 of the piston 3 Since the piston 3 is

  mounted by being secured in rotation but movable longi-

  tudinally in the gripping part 2, it can slide relative to the screw element 4 and pushes by its

  end before body 5 out of screw element 4.

  It is thus possible to advance the body 5 but the screw element 4 including its section projecting from the gripping part 2 is at the same time prevented from penetrating further inside the latter of

  so that the stick always retains its original length.

  In order to be able to resist bending forces,

  the screw element is preferably made of metal.

  To allow subsequent sharpening of the body 5 of material which can be spread out, the latter is housed by being secured in rotation inside the element 4. To this end, provision is made in the housing zone 6 of the step element. screws 4

  several longitudinal ribs 15 distributed over the circumference

  ference (fig 5) It is also possible to use

  a screw thread element 4 which has a cross-section

  indoor room that is not circular (fig 6) A section

  hexagonal or oval is particularly advantageous.

Claims (7)

CLAIMS l Stick, in particular a cosmetic stick which comprises a gripping part containing a piston and a screw-shaped element in the form of a socket, intended to receive a body of a material which can be extended and which, while being able to rotate by relative to the gripping part, is screwed onto the piston provided with a thread, characterized in that the threaded element (4) is retained by the gripping part (2) so as not to slide in the axial direction while the piston (3) is kept stationary in rotation but axially displaceable inside the gripping part (2) while being guided by the latter so that the piston (3) can penetrate inside the gripping part (2) when a rotational movement is imparted to the screw thread element (4).   2 Stick according to claim 1, characterized in that the screw thread element (4) is held so   axially non-displaceable inside the grip part   sion (2) by a snap connection (7, 8, 10).   3 Stick according to one of claims l or 2,   characterized in that the inner wall of the part of   gripping (2) has an inner bead (10) preferably   annular rence which projects from the wall and engages in a complementary annular groove (8) produced in the   outer wall of the threaded element (4).   4 Rod according to claim 3, characterized in that the inner bead (10) has a small distance from the end of the grip part (2) opposite the screw element (4) and in that the annular groove (8) is produced at a short distance from the end of the threaded element (4) opposite the gripping part (2)   Stick according to one of claims 3 or 4,   characterized in that the annular groove (8) in the threaded element (4) is produced in the form of an impression (7) which projects as an annular bead (9) from the surface   inside of the screw-shaped element in the form of a socket (4) -   6 Stick according to claim 5, characterized in that a thread (11) cooperating with a thread (12) of the piston (3), is produced in the annular bead (9)   protruding inside the threaded element.   7 Stick according to one of claims 1 to 6,   characterized in that the piston (3) has a radial projection (13) which covers a longitudinal rib (14) provided on the inner surface of the grip part (2). 8 Stick according to claim 7, characterized in that the radial projection (13) of the piston (3) is formed on the end-of the latter opposite the gripping part (2) and in that the rib (14 ) extends from the bottom of the grip part (2) to the level of the   inner bead (10) of the latter.   9 Stick according to one of claims 1 to 8,   characterized in that the body (5) consisting of a spreadable material is kept inside the threaded element (4) so that it cannot rotate thanks to a bond by forms.   Rod according to claim 9, characterized in that the threaded element (4) has on its inner surface and in the housing area (6) of the body (5) longitudinal ribs (15) distributed over the circumference or   at least locations of uncirculated interior sections eyelets (fig 6).   11 Stick according to one of claims 1 to 10,   characterized in that the threaded element (4) is a metal socket.