Device for closing articles

Abstract

 A device for closing articles, in particular clothing and leatherwear in general includes a first half-shell (9) and first and second arms (8,7) whose inner heads (80,70) are hinged to the first half-shell (9), so that the first and second arms face each other and can rotate on respectively first and second rotation axes (Z1,Z2), with an outer head (800) of the first arm (8) being shaped in such a way as to be fastened to a corresponding first article (A1) and an outer head (700) of the second arm (7) being shaped in such a way as to be hooked to an engagement element (S) of a corresponding second article (A2), or fastened thereto. At least one element (O) is mutually connected with the inner heads (80,70) of the first and second arms (8,7). Elastic means (50), cooperate with the element (O) and the inner heads (80,70) to define a closing position (K) and an opening position (H). A second half-shell (6) is fastened to the first half-shell (9) by means (M), coaxial with the first and second rotation axes (Z1,Z2).

Description

[0001] The present invention relates to the technical field concerning devices for closing articles, e.g. clothes, leatherwear in general, rucksacks and the like.

[0002] Different closing elements are used in clothes production field, such as buttons, loop fastenings, snap-hooks and the like, while for the leatherwear and especially for bags closing zip closings, magnetic elements, and butterfly-shaped closings are used.

[0003] As it is known, the button closing includes fastening a button to a first article, e.g. a first vertical end of a clothing piece, and making a button hole in a second article, e.g. in the second vertical end of the clothing piece. The button hole allows the button to pass therethrough in order to close the clothing piece and stabilize the mutual position of the first and second end and maintain their closing.

[0004] A loop fastening, or "frog", is a clothing piece closure including two parts, i.e. a piece of thread forming a slipknot, sewn to one side of the clothing piece, and an engaging element, e.g. a button fastened, by means of a piece of identical thread, to the other side of the clothing piece.

[0005] In closing configuration, the engaging element passes through the slipknot to stabilize the position of both sides of the clothing piece during the closing of the latter.

[0006] A snap-hook is another closing element for clothing: it includes a special hook, e.g. metallic, which cab have various shapes and dimensions, with a spring element. By means of the spring element, the hook can be closed and when closed, the hook takes the shape of a ring.

[0007] Besides the hook, connected to one side of the clothing, the snap-hook closure includes also a ring element, fastened to the other side of the clothing,. The hook is anchored to the ring to close the article.

[0008] Likewise, known magnetic elements and butterfly closings include two parts, a first part to be fastened to a first article, e.g. front surface of a bag, a second part to be fastened to a second article, e.g. a flap of said bag.

[0009] The first part of the butterfly-shaped closure includes a first element defined by an apertured base, fastened to the bag flap, and a second element defined by a support, fastened perpendicularly to the bag surface, to which a rotating head is constrained.

[0010] The rotating head takes two positions: a rest position, in which the head is longitudinal with respect to the surface, and a working position, in which the head, due to its introduction into the hole of the first element, is rotated by 90° to prevent it from withdrawing from the aperture of the base.

[0011] The whole operation is aimed at locking the position of the flap with respect to the fore surface of the bag.

[0012] The object of the present invention is to propose a closing device, which, as alternative to known buttons, loop fastenings, snap-hooks, allows to close an article in a rapid and simple way and, at the same time, is nice to see.

[0013] Another object of the present invention is to propose a closing device equipped with inner mechanisms which ensure stabilization thereof in closing condition, as well as in opening position.

[0014] The characteristic features of the proposed closing device will be pointed out in the following, in accordance with the contents of the claims and with reference to the enclosed drawings, in which:

• Figure 1 is a top view of some parts of the closing device, proposed by the present invention, pointing out their closing position;
• Figure 2 is the same view of Figure 1 showing the opening position of the parts of the said device which have been illustrated ;
• Figure 3 is a section view taken along line III-III of Figure 2;
• Figure 4a is a front view of the closing device in opening position, applied to an article;
• Figure 4b is the same view of Figure 4a with the closing device arranged in closing position;
• Figures 5, 6 are front views of the closing device according to a second embodiment, arranged in opening and closing positions, respectively;
• Figure 5a is a view, in a reduced scale, of a variant of what is shown in Figure 5;
• Figures 7, 8 are front views of the closing device according to a third embodiment, arranged in opening and closing conditions, respectively;
• Figure 9 is a partial top view of the device shown in Figure 1, pointing out its means in different embodiments;
• Figure 9a is a sectional and exploded view taken along line IX-IX of Figure 9;
• Figure 10 is a partial top view of the device shown in Figure 1, pointing out its means in different embodiments;
• Figure 10a is a sectional and exploded view taken along line X-X of Figure 10;
• Figure 11 is a partial top view of the device shown in Figure 2, pointing out the opening condition of the device and of the elements connected thereto;
• Figure 12 is a top view of the device of Figure 11 arranged in closing position.

[0015] With reference to the enclosed drawings, the reference numeral 1 indicates a device for closing articles, e.g. clothing, leatherwear in general, rucksacks and the like.

[0016] The closing device is composed of: a first half-shell 9, e.g. disk-like, first and second arms 8, 7, which are similar in shape and whose inner heads, 80, 70 respectively, are hinged to the first shell 9, so that the first and the second arms extend in opposite directions and can rotate about a first and second rotation axis Z1, Z2, respectively (Figure 3).

[0017] The shape of an outer head 800 of the first arm 8 is such that it can be fastened, e.g. by a stitching U, to a corresponding first article A1 (Figures 4a, 4b), and the shape of an outer head 700 of the second arm 7 is such that the head can be hooked to a engagement element S, e.g. a ring, of a corresponding second article A2, or anchored somehow to the article.

[0018] The inner heads 80, 70 of said first and second arms 8, 7 are in mutual engagement with an element O and cooperate, in contrast, with elastic means 50 connected to the element O or to the inner heads, so as to define a closing position K (Figure 1), in which the first and second arms 8, 7 are situated above the first half-shell 9, so that the outer head 700 of the second arm 7 is near to the inner head 80 of the first arm 8 and vice-versa, and an opening position H, in which the first and second arms 8, 7 are rotated about the corresponding axes Z1, Z2 outwards with respect to the first half-shell 9, so as to be oriented longitudinally (arrow W) towards opposite sides.

[0019] The closing device 1 includes also a second half-shell 6, fastened to the first half-shell 9 by known means, e.g. complementary snap fitting means (not shown) suitably made in the inner surfaces of the first and second half-shells 9, 6, screws or, as shown in Figure 3, two pins M, which are coaxial with the first and second rotation axes Z1, Z2.

[0020] The pins M define corresponding pivoting pins for the first and second arms 8, 7.

[0021] The second half-shell 6 is fastened to the first half-shell 9 so as to allow the first and second arms 8, 7 to rotate freely and to prevent the latter from vertical oscillation.

[0022] According to a first embodiment (Figures 1, 2, 3), the inner ends 80, 70 are formed by corresponding gear-sectors D1, D2 and the element O, with which the gear sectors are mutually connected, includes a toothed crown 5 situated inside the first half-shell 9, idle with respect thereto.

[0023] The above mentioned gear sectors D1, D2 engage with the crown 5.

[0024] The elastic means 50 include a spiral spring 509, whose one end is fastened to the toothed crown 5 in a first point R1, and whose other end is fastened to the inner surface of the first half-shell 9 in a second point R2.

[0025] According to this solution, the first half-shell 9 can feature, made thereon, some pegs, not shown, to which corresponding elastic means, not shown, are connected for defining snap-fit introduction of the pegs into corresponding, seats made in the toothed crown in order to lock the opening position H of the device.

[0026] A first variant of what is shown in Figures 1, 2, is seen in Figures 9, 9a; as it can be seen, the element O includes a toothed crown 2, which is supported, idle, by a pin 29, integral with the inner surface of the first half-shell 9; the above mentioned gear sectors D1, D2 engage with the toothed crown.

[0027] The elastic means 50 include a spiral spring 28, whose one end E1 is fastened, e.g. constrained within an anchorage channel Ca made in the pin 29, and whose other end E2 is introduced and fastened, e.g. fitted, in an anchorage seat Sa made in the upper surface Su of the toothed crown 2.

[0028] A second variant of what is shown in Figures 1, 2 is seen in Figures 10, 10a; as it can be seen, the element O includes a toothed crown 20, which features in its central part, a stem 209, protruding axially from the lower surface Si of the crown 20, complementary to a seat 208 made in the first half-shell 9.

[0029] The upper surface Sr of the toothed crown 20 features two parallel flat extensions 290a, 290b, e.g. integral with the surface Sr and situated in a central position with respect thereto, defining an anchoring channel C2.

[0030] The elastic means 50 include a spiral spring 280, whose one end is fastened, e.g. fitted within the anchorage channel C2, and whose other end E2 is introduced and fastened, e.g. fitted, in an anchorage seat S2 made in the inner surface of the second half-shell 6.

[0031] According to this variant, the second half-shell 6 includes a recess 27 made in the inner surface thereof, which houses, due to the coupling of the first half-shell 9 and second half-shell 6, the elastic means 50.

[0032] According to a different embodiment, the element O can include a first, second and third toothed crowns (not shown), mutually connected; the first toothed crown is arranged centrally with respect to the remaining second and third crowns and the latter are mutually connected with the inner heads 80, 70 of the corresponding first and second arms 8, 7.

[0033] As an alternative, the elastic means 50 can be connected to the inner heads 80, 70 of the first and second arms 8, 7 like described until now.

[0034] According to a second embodiment (Figure 5), each of the inner ends 80, 70 includes a kind of tooth P.

[0035] The element O includes two barrels, first 89 and second 79, received symmetrically by a cylinder 59, which is fastened to the first half-shell 9.

[0036] The barrels are carried by relative first and second stems 88, 78 protruding from the cylinder heads.

[0037] The free ends of the above stems feature, made therein, seats F, complementary to the teeth P.

[0038] The elastic means 50, e.g. a spring 508, are introduced into the cylinder 59, between the first barrel 89 and the second barrel 79.

[0039] The elastic means 50 act on the two barrels to facilitate the snap-fit introduction of the teeth into the relative seats, to define the closing position K, as well as to lock this closing position.

[0040] A possible variant of what is shown in Figures 5, 6, is seen in Figure 5a; there, each of the inner ends 80, 70 includes e.g. seats B: according to this solution, the ends of the stems 88, 78 of the barrels are introduced into the above-mentioned seats in order to lock their closing condition.

[0041] According to a third embodiment, see Figure 7, each of the inner ends 80, 70 includes, e.g. a kind of tooth P1.

[0042] The element O includes a first barrel 890 and a second barrel 790, received symmetrically by a cylinder 590, which is fastened to the first half-shell 9.

[0043] The barrels are carried by relative first stem 880 and second stem 870 protruding from the relative cylinder heads.

[0044] The free ends of the stems feature, made therein, seats F1, complementary to the teeth P1.

[0045] The elastic means 50, e.g. springs 507, are fitted onto the above first stem 880 and second stem 870 and go in abutment against the heads of the cylinder and the outer surfaces of the corresponding barrels.

[0046] A rotating element G is situated inside the cylinder 590, between the first barrel 890 and the second barrel 790, to assume two positions: in a working position T (Figure 7), used in the closing position K, the rotating element G acts on the barrels in order to facilitate the introduction of the teeth P1 into the relative seats F1, so as to define the above-mentioned closing position K, as well as to stabilize this closing position, with the elastic means being loaded; in a rest position V (Figure 8), used in the opening position H, the rotating element is rotated by 90° with respect to the initial position, the elastic means are released and the first barrel 890 and the second barrel 790 are axially moved inwards.

[0047] The outer heads 700, 800 of the first and second arm 8, 7 can have a shape such that their arrangement can be either along a horizontal plane, or a vertical plane, or in any other orientation.

[0048] As shown in Figures 11, 12, the first arm 8 and the second arm 7 feature stiffening ribs 25, obtained in the inner portion of the arms, and a first stabilizing element 24a and a second stabilizing element 24b, e.g. dentils connected respectively to the outer portions of the above first and second arms 8, 7.

[0049] When in closing position K (Figure 12), the first dentil 24a goes in abutment against and blocks the outer head 700 of the second arm 7 and the second dentil 24b goes in abutment and locks the outer head 800 of the first arm 8 to stabilize the closing position K.

[0050] The first half-shell 9, as shown in Figure 11, includes also mechanical stops 26, e.g. integral with the first half-shell 9 and arranged on both sides of the element O.

[0051] In the opening position H of the device, the mechanical stops 26 go in abutment against the first and second arm 8, 7 between the respective inner heads 80, 70 and the first and second dentil 24a, 24b, so as to define stop points for the first and second arms 8, 7 in opening position H.

[0052] The device for closing articles is used in the following way.

[0053] Let us take into consideration that the closing device is in closing position K, where the outer end of the first arm 8 is secured to the first article A1, e.g. one side of a coat, or to a rucksack flap, and the hooking element S is fastened to the second article A2, the other side of the coat, or to the fore surface of the rucksack.

[0054] In order to close the article, it is necessary to hook the outer end 700 of the second arm 7 with the engagement element S.

[0055] The user grips the outer end 700 of the second arm 7 and drives it to a rotatory-translational motion Y - Y1 (Figure 1), to contrast the action of the elastic means 50, while pulling at the same time the end toward the engagement element S.

[0056] The above motions cause the rotation (direction J) of the first half-shell 9 and the second half-shell 6 about the first rotation axis Z1, and then, the longitudinal movement with respect to the figures of the latter, with contemporary rotation of the second arm 7 about the second rotation axis Z2, to determine passage of the device from the closing position K to the opening position H.

[0057] According to the first solution, Figure 2, rotation of the second arm 7 determines the rotation of the toothed crown 5, 2, 20, and consequently, loading of the spiral spring 509, 28, 280, since it is fastened.

[0058] After the passage to the opening position H, the user hooks the end of the second arm 7 to the above mentioned element S; the return to the closing position K is facilitated by the reaction of the spiral spring 509, 28, 280: the closing position is locked because the spring remains partially loaded.

[0059] According to the second solution, Figures 5, 6, the rotation-translation motion Y - Y1 of the second arm 7 determines the disengagement of the teeth P from the relative seats F.

[0060] Consequently to the passage to the opening position H, the user determines hooking of the end 700 of the second arm 7 to the above mentioned element S and acts in the opposite direction so as to resume the closing position K (rotation-translation of the second arm 7 in the opposite direction):

the closing position K is stabilized by the spring 508.

[0061] According to the third solution, Figures 7, 8, before moving and rotating the second arm 7 in the directions Y - Y1, it is necessary to act from outside on the rotating element G, bringing it to the rest position V.

[0062] Due to this arrangement, the second arm 7 is free to rotate on the second rotation axis Z2, so that the outer end 700 can be hooked to the engagement element S.

[0063] The return to the closing position K must be guided by the user, who acts in the opposite direction until the closing position K is reached, and subsequently the rotating element G is brought to the working position O:

the latter acts on the barrels to allow and facilitate the teeth P1 to be inserted into the seats F1.

[0064] The device for closing articles 1, e.g. articles of clothing, leatherwear in general, rucksacks and the like is simple to use, aesthetically pleasant and alternative to what is found on the marketplace.

[0065] The device is very functional, because it stabilizes the mutual position of a first and second article A1, A2 and maintains them closed.

[0066] The fact that the inner ends include corresponding gear sectors D1, D2, mutually connected with the toothed crown 5, 2, 20, which contrasts the corresponding elastic means 50, ensures the device stability in closing and opening positions.

[0067] The fact that the elastic means 50 include a spiral spring 509, which is fastened in two points R1, R2, (or by a spring 28, 280 fastened in the anchorage channel Ca, C2 and in the anchorage seat Sa, S2), and loaded at the opening of the first and second arm 8, 7, determines, as a consequence of the arrangement in the opening position H, the return of the first and second arm to the closing position K.

[0068] According to the second solution shown in Figures 5 and 6, the outer heads 80, 70 include teeth P which, in the closing position K, are snap-fitted into the corresponding seats F made in the stems 88, 78 of the first barrel 89 and the second barrel 79; the stability of the closing position is ensured by the spring 5080.

[0069] Besides stabilizing the introduction of the teeth into the corresponding seats F, the elastic means 508 intervene also to stabilize the first arm and the second arm in the opening position H: this is caused by the friction between the outer heads of the stems 88, 78 and the inner heads 80, 70 of the first arm 8 and the second arm 7.

[0070] According to the third solution (Figures 7, 8), the rotating element G allows to lock the closing position K.

[0071] The fact that the first dentil 24a and the second dentil 24b are connected to the corresponding first arm 8 and the second arm 7, allows bigger stability of the device 1 in the closing position K, because the teeth form stops for the outer ends 800, 700 of the arms.

[0072] The rotation element can be operated by the technical solutions known to those expert in the field.

[0073] Moreover, the fact that the device is composed of two half-shells is advantageous because the half-shell defining the outer part of the device can assume different shapes and thus it can satisfy a high number of aesthetic needs.

[0074] The shape of the device 1, described previously in a detailed way, allows its wise use for closing articles of clothing, in particular coats and/or jackets, as well as for closing leatherwear articles, such as bags, rucksacks, boots and the like.

Claims

1. Device for closing articles characterized in that it includes:

a first half-shell (9);

first and second arms (8,7) whose inner heads (80,70) are hinged to the first half-shell (9), so that the first and second arms are situated on opposite sides and can rotate about respectively first and second rotation axes (Z1,Z2), with an outer head (800) of the first arm (8) being shaped in such a way as to be fastened to a corresponding first article (A1) and an outer head (700) of the second arm (7) being shaped in such a way as to be hooked to an engagement element (S) of a corresponding second article (A2), or fastened to this last mentioned article;

at least one element (O), mutually connected with the inner heads (80,70) of said first and second arms (8,7);

elastic means (50), cooperating with said element (O) and said inner heads (80,70) to define a closing position (K), in which said first and second arms (8,7) are situated above the first half-shell (9), so that the outer head (700) of the second arm (7) is near to the inner head (80) of the first arm (8) and vice-versa, and an opening position (H), in which said first and second arm (8,7) rotated on the corresponding axes (Z1,Z2) toward the outside of the first half-shell (9), are oriented longitudinally;

a second half-shell (6), fastened to the first half-shell (9) by means (M) coaxial with said first and second rotation axis (Z1,Z2).

2. Closing device, according to claim 1, characterized in that said second half-shell (6) is fastened to said first half-shell (9) so as to allow the first and second arms (8,7) to rotate freely and to prevent the latter from vertical oscillation.

3. Closing device, according to claim 1, characterized in that said elastic means are connected to said element (O).

4. Closing device, according to claim 1, characterized in that said elastic means (50) are connected to the inner heads (80,70) of said first and second arms (8,7).

5. Closing device, according to claim 1, characterized in that said means (M) define corresponding pivot pins for the first and second arms (8,7).

6. Closing device, according to claim 1, characterized in that said means (M) are shape-engagement elements.

7. Closing device, according to claim 1, characterized in that said inner ends (80,70) are formed by gear sectors (D1,D2), and in that said element (O), with which the gear sectors are mutually connected, is formed by a toothed crown (5,2,20), situated inside the first half-shell (9), idle with respect to the latter and subjected to said elastic means (50).

8. Closing device, according to claim 7, characterized in that said toothed crown (2), subjected to said elastic means (50), is supported, idle, by a pin (29), integral with the inner surface of the first half-shell (9) and in that the free end of said pin (29) features an anchorage channel (Ca) made therein.

9. Closing device, according to claim 7, characterized in that said toothed crown (20), subjected to said elastic means (50), features, in its lower part, a stem (209), received by a seat (208) made in the center of said first half-shell (9), and in that the upper surface (Sr) of said toothed wheel (20) features two parallel dentils (290a,290b), defining an anchorage channel (C2).

10. Closing device, according to claim 7, characterized in that said elastic means are defined by a spiral spring (509), one end of which is fastened to the toothed crown (5) in a first point (R1), and the other end of which is fastened to the inner surface of the first half-shell (9) in a second point (R2), with said means being aimed at facilitating the passage from the opening position (H) to the closing position (K) and at locking the latter.

11. Closing device, according to claim 8, characterized in that said elastic means (50) are defined by a spiral spring (28), with one end (E1) constrained within said anchorage channel (Ca) made in the pin (29), and with another end (E2) inserted and fastened within an anchorage seat (Sa) made in the upper surface (Su) of said toothed crown (2), with said means being aimed at facilitating the passage from the opening position (H) to the closing position (K) and at locking the latter.

12. Closing device, according to claim 9, characterized in that said elastic means (50) are defined by a spiral spring (280) having one end (E3) constrained within said anchorage channel (C2), and another end (E4) inserted and fastened within an anchorage seat (S2) made in the inner surface of the second half-shell (6), with said means being aimed at facilitating the passage from the opening position (H) to the closing position (K) and at locking the latter.

13. Device, according to claim 7, characterized in that it includes a plurality of pegs made on the first half-shell (9) for connection thereto of corresponding elastic means aimed at determining snap-fit introduction of said pegs into corresponding seats made in said toothed crown (5) in order to lock at least the opening position (H) of said device.

14. Device, according to claim 7, characterized in that it includes a plurality of pegs made on said toothed crown (5) for connection thereto of corresponding elastic means aimed at determining snap-fitting introduction of said pegs into corresponding seats made in said first half-shell (9) in order to lock at least the opening position (H) of said device.

15. Closing device, according to claim 1, characterized in that each of said inner ends (80,70) includes at least one dentil (P) and in that said element (O) is subjected to said elastic means (50) and includes two barrels, a first barrel (89) and a second barrel (79), received symmetrically by a cylinder (59), which is fastened to the first half-shell (9), with said barrels carried by a relative first and second stems (88,78), which protrude from the relative cylinder heads and in whose free ends seats (F) are made, complementary to said dentils.

16. Closing device, according to claim 15, characterized in that said elastic means (50) include a spring (508), situated inside said cylinder (59), between the first and second barrel (89,79), with said spring (508) acting on said barrels to facilitate the snap-fit introduction of said dentils into the relative seats, in order to define said closing position (K) and lock this closing position.

17. Closing device, according to claim 1, characterized in that each of said inner ends (80,70) features seats (B), and that said element (O) includes two barrels, first (89) and second (79), received symmetrically by a cylinder (59), which is fastened to the first half-shell (9), with said barrels carried by a relative first and second stems (88,78), which protrude from the relative cylinder heads, with the latter being complementary to said seats (B) and in that said elastic means (50) are defined by a spring (508), situated inside said cylinder (59), between the first and second barrel (89,79), with said spring (508) acting on said barrels to facilitate the snap-fit introduction of said stems into the relative seats (B), in order to define said closing position (K) and to lock this closing position.

18. Closing device, according to claim 1, characterized in that each of said inner ends (80,70) features at least one tooth (P1) and that said element (O), subjected to said elastic means (50),
includes a first barrel (890) and a second barrel (790), received symmetrically by a cylinder (590), which is fastened to the first half-shell (9), with said barrels carried by a relative first and second stem (880,870), which protrude from the relative cylinder heads, and in whose free ends, seats (F1) are made, complementary to said teeth (P1).

19. Device, according to claim 18, characterized in that said elastic means (50) include springs (507), fitted on said first and second stems (880,870) for going in abutment against the heads of said cylinder and the outer surfaces of the corresponding barrels and in that a rotating element (G) is situated inside the cylinder (590), between said first and second barrels (890,790), said rotating element (G) taking two positions:

a working position (T), taken in the closing position (K), in which said rotating element (G) acts on said first and second barrels in order to facilitate the introduction of the teeth (P1) into the relative seats (F1), so as to define said closing position (K) and lock this closing position, with said elastic means being loaded;

a rest position (V) (Figure 8), taken in the opening position (H), in which the rotating element is rotated by 90° with respect to the initial position, the elastic means are released and the first and second barrel (890,790) are axially moved inwards.

20. Closing device, according to claim 1, characterized in that said first and second arms (8,7), articulated to said first half-shell (9), include a first and a second stabilizing element (24a,24b), connected respectively to the outer portions thereof, with said first element (24a), when in closing position (K), going in abutment and locking the outer head (700) of the second arm (7) and with said second element (24b) going in abutment and locking the outer head (800) of the first arm (8) to stabilize the closing position (K).

21. Device, according to claim 20, characterized in that said first half-shell 9 includes mechanical stops (26), which in the opening position (H) of the device, go in abutment against said first and second arms (8,7) between the respective inner heads (80,70), and said first and second stabilizing elements (24a,24b) defining stop points for the first and second arms (8,7) in said opening position (H).

22. Closing device, according to claim 1, characterized in that said first and second arms (8,7) include first and second stabilizing elements (24a,24b), connected respectively to the outer portions thereof, with said first element (24a), when in closing position (K), going in abutment and locking the outer head (700) of the second arm (7) and with said second element (24b) going in abutment and locking the outer head (800) of the first arm (8) to stabilize the closing position (K) and in that said second half-shell (6) includes mechanical stops (26), which in the opening position (H) of the device, go in abutment against said first and second arms (8,7) between the respective inner heads (80,70), and said first and second stabilizing elements (24a,24b) defining stop points for the first and second arms (8,7) in said opening position (H).

Drawing