FR2481386A1 - TIGHTENING DEVICE FOR LOCKING TWO TELESCOPIC TUBULAR ELEMENTS - Google Patents

Abstract

THE SELF-ASSEMBLABLE FIXING DEVICE INCLUDES, ARRANGED IN A LATERAL FLARED PART 13 OF THE EXTERIOR TUBE 12, A THREADED ELEMENT 15 INCLUDING A STOP AND HOLD FLANGE 17, A THREADED ELEMENT 16, AND A SPRING ELEMENT 18 IN THE FORM OF HAIR PIN SERVING TO HOLD THE ASSEMBLY IN PLACE IN THE FLARING 13 AND ENSURING THE TIGHTENING FORCE OF THE THREADED ELEMENT TO DISTRIBUTE IT ON THE WALL OF THE INTERNAL TUBE 11 THUS REMOVING THE RISK OF LOCAL DEFORMATION OF THE LATTER. THE DIFFERENT ELEMENTS CAN BE DELIVERED AS A "KIT" AND DISASSEMBLED AFTER USE. APPLICATION, ESPECIALLY TO TELESCOPIC TENT MAST.

Description

1.

  The present invention relates to a device for

rage to block or secure together two tubes or a tu-

be and a telescopically sliding rod, one in

  the other, more particularly for a telesco tent pole

spike, including an inserted threaded element, from the inside

  laughing, and held in a corresponding through opening

  dante formed in a laterally widened part of the end

  external mite of the external tube and a threaded element cooperated

rant with this tapped and selectively actuable element

to make the tight clamp connection between the two tu-

  bes. Conventional clamping devices for tent poles include a threaded element attached by welding or riveting to the outer tube and a threaded clamping stud

  and blocking. Due to the relative specific pressure-

significant exerted by the end of the piton on the inner tube to be blocked, it occurs fairly quickly on this

last deformation and / or punctual damage.

The manufacture of such a clamping device is moreover quite delicate insofar as the tapped element must be attached and put in place manually and the bolt or the screw

  must be screwed into the latter before performing

ser the lacquering of the tube. Indeed, if the piton is not previously

  2. lably introduced into the threaded element, the threads of this

  the latter would be seriously clogged during the operation-

tion of lacquering, with the associated drawbacks.

  The object of the present invention is precisely to propose an improved clamping device which overcomes these drawbacks, using three separate individual elements

  can be supplied in a "kit" so that the buyer or the user

  the tent pole operator himself assembles the device

tightening tif. Because the tubes can be so pre-

ready and delivered without attachments being shown

  tees on them, the risk of damage to both the tubes

  components of the clamping device are found there

dramatically reduced during packaging and transport operations. To do this, according to a characteristic of the present invention, the means or the device for fixing by clamping are removable and comprise a threaded element.

  and a spring element folded back in the shape of a hairpin

  veu, reported by snap-fastening in the longitudinal direction

  the on the free wall of the tube at the widened part

from the end of the outer tube, so as to maintain the elec-

tapped in final mounting position relative to the opening. A function of the spring element is thus

  to keep the threaded element in position in relation to

  port when opening while preventing this element from escaping

  per, without the need for recourse to

  specific fixing assignments, for example by riveting or welding. To oppose a rotation of the tapped element relative to its axis, according to another characteristic of the invention, this tapped element comprises a flange and

the laterally enlarged part of the outer tube is con-

correspondingly formed to prevent rotation of the threaded insert relative to the opening in

the final mounting position.

Thanks to the arrangement of this collar on the threaded element, the latter is blocked in the opening 3. is automatically carried out during its installation due to the fact

of the pressure developed by the spring element against the adhesive-

rette from inside the enlarged part, which presents

  you advantageously have a trapezoid shape. The rotation of -

the threaded element can thus be easily prevented by giving the collar a rectangular or square contour, the reception of the collar in the widened part in the form of

trapezoid of the outer tube opposing angular displacement

relative re of the threaded element.

Instead of being applied locally against an area

point of the inner tube, the clamping pressure of the element

  the screw is distributed on the inner tube by the over-

larger side of pressing offered by the element of

spring, thus ensuring more effective tightening without risk

damage to the peripheral surface of the tube. In

  effect, as mentioned above, with the clamping devices

traditional ages we quickly end up with a deformation

  less local in the cross-section of the inner tube which can

delay or make it difficult to move teles

copy tubes between them; thanks to the arrangement according to the

  vention, this drawback is eliminated due to the reduction-

  tion of local or point pressures and distribution of the clamping pressure over a larger area using

from the pressing surface of the spring element.

The spring element being arranged on the outer face

  ne of the outer tube, it can be secured to this tube either by hooking into the enlarged opening for receiving the threaded element or being received in a notch or a

  slot thereof; however, in one embodiment,

  particularly advantageous of the invention, the spring element

  includes, for its mounting on the external face of the external tube

  laughing, an opening receiving the threaded element or the threaded element. According to another characteristic of the invention, in order to further reduce the damage to the external surfaces of the tubes which are not yet lacquered or already lacquered, the two outer ends of the branches of the spring element are offset

  in the same direction, typically folded in the direction-

248 1380

  4. towards the branch or the external part of the spring element. The outer part of the spring element can

thus be easily brought back above the tarau-

while the lower part of the spring element facilitates telescoping in both directions of the inner tube without its free end notwithstanding the quality of its deburring, seizing or scratching the wall of the tube. The system according to the present invention therefore makes it possible to use a set of three separate individual elements, namely the spring element, the threaded element and the element

threaded, for making a self-tightening device

assembled, these different elements can be offered for sale independently or together, advantageously in

transparent packaging.

Other features and advantages of the pre-

  invention will emerge from the following description

  of an embodiment, given by way of illustration but

  in no way limiting, made in relation to an-

  attached, in which FIG. 1 is a sectional view of a device for clamping and locking telescopic tubes of the prior art;

  Figure 2 shows, partially in section along

  gitudinal, a device for clamping telescopic tubes according to the invention; and Figure 3 is a cross-sectional view

- along line III-III of Figure 2.

In Figure 1 we recognize a remote assembly

  classic copy of an indoor tdbe 1 in an outdoor tube

  2, the two tubes having a cylindrical section, the tube ex-

  However, in the vicinity of its outer end, an enlarged or flared lateral part in the shape of a trapezoid 3. In the upper wall part of this

  flaring is formed an opening 4, in which is

  of a tapped element report 5. In this tapped element can be screwed a threaded element or peg 6 which, in 5. being strongly screwed, exerts against the external surface of the

  inner tube 1 enough pressure to block this tu-

  be inside with respect to the outside tube. In another mo-

  of embodiment of the prior art, the outer tube 2 can have a perfectly tubular profile up to its end on which a tapped plate or a nut is then

welded to achieve the same type of attachment.

In the clamping and locking device according to

the invention shown in Figures 2 and 3, the inner tube

laughing 11 is received telescopically in the outside tbe: 12

by providing a certain play between them. As in the agency-

  ment of Figure 1, the end of the outer tube 12 has an enlarged or flared side 13 in the shape of a trapezoid? in which the tightening device is fitted

  said. The upper wall of this flared part also includes

  a through opening 14, in which is this

  simply arranged a threaded element 15 intended to receive

see a threaded element or a peg 16. The threaded element 15

  can be generally round or square, and includes a collar-

  te lower square 17. This flange 17 is received and guide

  dée in the upper part of the trapezoidal flare 13

  by being held in place, pressed against the upper wall

re of this recess, by a spring element 13 constituted

  of a spring steel blade folded at 1800 in the shape of a thorn-

hairball of which the upper part or branch 19 comprises

carries an opening 20 receiving the projecting barrel part of the threaded element 15, the two cooperating elements having a corresponding profile, advantageously non-circular, for example square, the part or the lower branch of the spring element extending longitudinally in the flare 13

  at least until covering the opening 14 and now normalized

  Lately pressed the flange 17 against the wall of the flare-

ment 13. When the threaded element 16 is screwed into the threaded element 15, its lower end, at first, does not in fact protrude beyond the flange 17 and

the lower part 21 of the spring element carries normal-

  ment in elastic stress against the flange, as 248138e 6. shown in dotted lines in Figure 2, which keeps the whole of the threaded element, the threaded element and the spring element in place in the flaring 13. By further screwing the threaded element 16 into the threaded element 15, the lower end of the threaded element gradually protrudes beyond the flange 17 and comes to bear, away from the collar, against the lower part 21 of the spring element 18, to apply the latter flat against the peripheral surface of the inner tube 11, in the configuration shown in FIG. 2, a more pronounced tightening firmly immobilizing the two tubes one over the other. Under the application of a pronounced clamping of the threaded element 16, for the application of a significant clamping pressure on the external surface of the inner tube 11, the clamping force of the threaded element is distributed by the surface of the inner part or branch 21 of the spring

18 over a large area of the periphery of the inner tube

  11, thus preventing deformation and / or damage -

  persistent of the inner tube 11 at the level of the

Tightening.

  Although in Figures 2 and 3 there is shown the spring element comprising, in its upper branch

or external, an opening 20 for its threading on the cam

  no of the threaded element 15, this measurement is not essential

  sand, the upper part 19 of the spring element can

for example having a folded end in the form of a cross

  chet engaged in the enlarged opening 14 or in a slot formed in the barrel of the insert to form an anchor for the outer part of the spring element and thus make it captive. The embodiment shown

  in Figures 2 and 3, however, constitutes the embodiment

simplest and most effective way to associate the element

spring to the outer tube 12 and to the threaded element, the combination of the opening in the outer branch of the spring element and of the threaded element making it possible to be free from setting or orientation conditions of this last. 7. To avoid damage by scratches on the

generally lacquered exterior surfaces of tubes, ex-

  outer hoppers of the branches of the spring element 18 are slightly folded upwards, as shown in 22 and 23, which prevents these ends, whose deburring is not always perfect, from coming into contact with the surfaces

tubes.

The user of the telescopic device, delivered in a "kit", can himself very easily arrange the clamping device in the outer tube, and leave it there permanently or undo it if necessary after use. It goes without saying that the

  device according to the invention is suitable not only for tu-

bes telescopic cylindrical, for tent pole or parasol, but also to prismatic telescopic tubes, by

  square examples, and that the same outer tube 12 can comprise

ter several clamping devices depending on the type or size

  required blocking lift and / or the need to center an inner tube of relatively small section compared to an outer tube of comparatively larger section. Because the clamping pressure is distributed over a relatively large pressing and friction surface, the enlarged trapezoidal part 13 does not need to be dimensioned in

  height than to simply accommodate the thickness of the collar

  thread of the threaded element and the height of the branch

  21 of the spring element 18, with its folded end 22, taking into account, moreover, the play required between

the two telescopic tubes. All the advantages of the

tif of the present invention are therefore achieved notwithstanding the permitted reduction in deformation or local flaring of the end portion of the outer tube, which contributes

  further lower manufacturing costs and better

their overall aesthetic.

  Although the present invention has been described in

  lation with particular embodiments, it is not limited thereto but is on the contrary susceptible to modifications and variants which will appear to those skilled in the art.

248132: -

8.

Claims (7)

lb CLAIMS   1 - Clamping device for locking together two tubes or a tube and a rod telescopically sliding one inside the other, in particular for a telescopic tent pole, comprising: a threaded element introduced from the inside and held in a corresponding opening formed in a laterally enlarged part of the outer end of the outer tube, and a threaded element received in this threaded element for locking by clamping the two Lubes, characteristic laughed in that the clamping device is removable and com- takes a crazy threaded element (15) and a spring element   folded in the shape of a hairpin (18), assembled by snap-on   longitudinal ge on the free wall of the outer end of the outer tube (12), at the widened part (13), of   so as to keep the threaded element (15) in the mounting position   final age in relation to the opening (14).   2 - Device according to claim 1, characterized in that the threaded element (15) comprises a flange (17), the laterally enlarged part (13) of the outer tube (12) being shaped correspondingly to prevent a ro-   tation of the threaded element relative to the opening (14) in the final mounting position,   3 - Device according to claim 1 or the res- dication 2, characterized in that the spring element (18) is produced by folding over itself a leaf of spring steel, the inner part (21) of the spring element   extending into the outer tube (12) having such a length   the that it extends at least until the opening (14) and a lar-   geur at least equal to the diameter of the opening.   4 - Device according to claim 2, characterized in that the outer part (19) of the spring element (18) applied against the outer surface of the outer tube (12) has an opening (20) for receiving the tarau- dice (15). 5 - Device according to claim 4, character- se in that the opening (20) of the outer part (19) of the spring element (, 18) and the threaded element (15) have 9. corresponding non-circular shapes.   6 - Device according to claim 3, charac-   terized in that the two outer ends (22, 23) of the spring element (18) are folded in the same direction. 7 - Set of a spring element, a threaded element and a threaded element for producing a self-assembling locking device according to one of the previous claims.