Fastening device for assembly and quick release between objects

Abstract

A fastening device for assembly and quick release between objects includes a retaining device for an attachment element with a dockable portion. There is a plurality of separable parts held close together around the attachment element by at least one disengageable preloading mechanism. The preloading mechanism includes a link wound around the separable parts in order to hold them closed on the attachment element, which has the appearance of a ribbon wound in a spiral and has spring properties. The ribbon has a non-constant thickness, i.e. the thickness decreases from the inside towards the outside of the spiral. The thickness decreases with the angle of the spiral. It is manufactured as such, in its final form, by a manufacturing process employing either the removal of material by machining, or by aggregation of material.

Claims

1. A fastening device, comprising: a hooking element having a securing portion; and a retaining means being comprised of: a plurality of separable parts being retained around said securing portion; and a releasable pre-stressing means engaged with each separable part of said plurality of separable parts such that each separable part is elastically restored to a respective distance from each other and kept close together about said hooking element, wherein the releasable pre-stressing means is comprised of a link wound about said plurality of separable parts so as to keep each separable part of said plurality of separable parts closed on said hooking element, wherein said link has at least one end so as to be fastenable to a means for maintaining and releasing tension exerted on said link, and wherein said link is comprised of ribbon wound into a spiral so as to form a spring, wherein the ribbon has a non-constant thickness, and wherein said non-constant thickness decreases from an inside portion of said ribbon of said spiral to an outside portion of said ribbon of said spiral, said non-constant thickness decreasing at an angle.

2. The fastening device, according to claim 1, wherein said ribbon wound into said spiral is formed by a manufacturing process implementing either a machining process so as to remove material, or an aggregating process so as to add material.

3. The fastening device, according to claim 2, wherein the machining process is a wire spark erosion process.

4. The fastening device, according to claim 2, wherein the aggregating process is a three dimensional metal printing process.

5. The fastening device, according to claim 2, wherein the aggregating process further comprises a molding process and a solidification process.

6. The fastening device according to claim 1, wherein said ribbon has an inner end made integral with at least one separable element of said plurality of separate elements, said at least one separable element having a cavity, and wherein said inner end is comprised of a bulge being insertable into said cavity, said bulge and said cavity having complementary shapes so as to retain said bulge in said cavity.

7. The fastening device, according to claim 1, wherein said ribbon has an outer end shaped so as to form a fastening hook so as to be fastenable to the means for maintaining and releasing tension exerted on said link.

8. The fastening device, according to claim 1, wherein said ribbon has an outer end comprising a means for locking of a closed position of said ribbon, and wherein the means for locking is comprised of a protruding element radially protruding from said ribbon, and a hollow portion having a complementary shape to said protruding element so as to anchor said hollow portion to said protruding element.

9. The fastening device, according to claim 8, wherein the means for locking is further comprised of a plurality of protruding elements radially protruding from said ribbon, and a plurality of hollow portions, each hollow portion of said plurality of hollow portions having a complementary shape to a respective protruding element of said plurality of protruding elements so as to anchor each protruding element of said plurality protruding elements to a respective hollow portion of said plurality of hollow portions.

10. The fastening device, according to claim 1, wherein said ribbon has an outer end comprising a means for locking of a closed position of said ribbon, wherein the means for locking is comprised of a rivet being mounted at said outer end having a protuberance; and a hole being cooperative with said protuberance, said hole being drilled on said outer end of said ribbon.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

(1) FIG. 1 shows a perspective view of a fastening device of the prior art and more specifically according to document WO 2009/138625.

(2) FIG. 2 shows a perspective view of a pre-stressing means of a fastening device according to the invention.

(3) FIG. 3 shows a schematic view of the same fastening device, in use.

(4) FIG. 4 shows a schematic view of several fastening devices according to the invention being implemented.

DETAILED DESCRIPTION OF THE INVENTION

(5) When referring to FIG. 2, there is a releasable pre-stressing means 1 according to the invention, which is in the form of a link 2a being comprised of a ribbon 2, being wound into a spiral 2b so as to form a spring 2c and having the peculiarity of having a non-constant thickness, i.e. [it] the ribbon 2 decreases from an inside portion of the ribbon at the inner end 20 to an outside portion of the ribbon at the outer end 21.

(6) This feature is related to the method of manufacturing this ribbon, namely, according to the invention, by removal of material by machining, or by aggregation of material by 3D printing or molding.

(7) Preferably, but non-restrictively, the decrease is constant.

(8) When referring now to FIG. 3, there is the releasable pre-stressing means 1 associated with a clamp or retaining means 3, of the type of the one P of FIG. 1 and described in document WO 2009/138625. Of this clamp or retaining means 3, only three separable elements 30 are visible, which are intended to surround and retain a schematically shown fastening or hooking element R having a securing portion R1 in order to form a fastening device.

(9) These separable elements 30 are furthermore elastically restored into their distance from each other, the releasable pre-stressing means 1 being capable of forcing them to come closer to each other.

(10) The inner end 20 and one of the separable elements 30 are shaped so as to be made integral with each other.

(11) According to the embodiment being shown, the inner end 20 has a bulge 22, while the separable element 30 includes a cavity 31 having a complementary retentive shape, in which the bulge 22 is inserted and retained.

(12) In this case, the bulge 22 has the form of a cylinder, with an axis parallel to that of the winding of the ribbon 2.

(13) The outer end 21 is shaped as a hook 23, permitting the fastening of a means 4 for maintaining and releasing tension exerted on the link 2a.

(14) Advantageously, the releasable pre-stressing means 1 according to the invention further includes a means 24, 25, 24a, 25b for locking a closed position of the ribbon 2. The means 24, 25, 24a, 25b is in the ortho-radial direction in order to also lock the opening of the clamp or retaining means 3 and also locks the ribbon in the axial direction permitting to control the closed position during shocks and vibrations, which can cause parasitic sliding of the windings with respect to each other in the axial direction. The locking then occurs by obstacle, which prevents any sliding, even during stresses due to thermal cycles.

(15) This means for locking the closed position consists of two elements having complementary shapes, a first protruding element 24 protruding from the periphery of the ribbon 2, and a second element (hollow portion) 25, arranged at the base of the hook 23, forming a hollow indentation complementary to the shape of the first protruding element 24 and intended, after closing, to anchor onto the latter. The means for locking the closed position can alternatively consist of a rivet 24a being mounted at the outer end 21 and having a protuberance 25a capable of cooperating with a hole 25b drilled in the outer end 21 of the ribbon.

(16) Advantageously and preferably, the protruding element 24 is in the form of a protruding bar arranged transversely on the ribbon 2, and the sides 26 and 27 of which are beveled, so as not to oppose the release and not to hinder the expansion when unlocking.

(17) According to a variant, not shown, the ribbon 2 includes several protruding elements 24 arranged and spaced apart longitudinally, eventually over several windings, as well as several elements or hollow portions 25 each capable of cooperating with a respective protruding element 24, in a tightened position about the pumice or retaining means 3.

(18) When referring to FIG. 4, we can see the use of three clamps or retaining means 3, each equipped with a releasable pre-stressing means 1 according to the invention.

(19) The three clamps 3 are all in the closed position, the releasable pre-stressing means 1 being locked through links 40, which pass over a trigger pin 5, which angularly returns the links 40 to means 41 for fastening and maintaining the links in tension. 40.

(20) It should be understood that the withdrawal of the trigger pin 5 causes the simultaneous release of the tension of all the links 40, and the expansion of the releasable pre-stressing means 1 and the opening of the clamps 3.