초록 ▼

The invention relates to a riveting tack (50) to be introduced into coaxial openings of at least two elements to be assembled, and comprising a hollow cylindrical body (51), a rod (53) passing through the hollow body and partially provided with an external thread (52a), a nut (54) mounted on the thr

The invention relates to a riveting tack (50) to be introduced into coaxial openings of at least two elements to be assembled, and comprising a hollow cylindrical body (51), a rod (53) passing through the hollow body and partially provided with an external thread (52a), a nut (54) mounted on the threaded end (53a), two half-clips (56) fixed to the rod (53) and comprising hooking lips (57) on the ends thereof, and a spacer (58) arranged between the two half-clips (56), the rod/half-clip set being axially mobile along the spacer (58) between a first position wherein the hooking lips (57) are radially close, and a second position wherein the two half-clips (56) are retracted inside the hollow body (51) and radially distanced from each other. The invention is characterized in that the set formed by the half-clips (56) and the spacer (58) is, in the cross-section thereof, in the form of a near-perfect circle having a diameter identical to the inner diameter of the openings.

대표청구항 ▼

1. A riveting screw tack (50) to be introduced into the respective coaxial openings (22, 22′) of at least two elements (20, 20′) to be assembled and in the guide slots (12) of a template-forming boring grid (10), coaxial with the openings (22, 22′) of the two elements (20, 20′), the tack comprising:

1. A riveting screw tack (50) to be introduced into the respective coaxial openings (22, 22′) of at least two elements (20, 20′) to be assembled and in the guide slots (12) of a template-forming boring grid (10), coaxial with the openings (22, 22′) of the two elements (20, 20′), the tack comprising: a hollow cylindrical body (51) extending along an elongation axis (XX′) and having a bearing surface (52) intended to come into contact with an outer surface (21) of the first (20) of the two elements,a central rod (53) locally passing through the hollow body (51) and having a portion located inside said hollow body provided with an external threading (53a),a nut (54) mounted on the threaded end (53a) of the rod (53) and supported on an end surface (51a) of the hollow body (51),two axial half-clips (56) fixed to the rod (53), said clips having edges (57) on their free end (56a) projecting outward, substantially radially, to form hooking lips on the outer surface of the second of the two elements (20′),a central spacer (58) with along the elongation axis (XX′) between the two half-clips (56) and fixed to the hollow body (51) within which it is prevented from rotating and translating,the rod/half-clip set being axially mobile within the hollow body (51) and along the spacer (58) by rotating the nut (54) on the threaded rod (53a) between a first position of rest, in which the hooking lips (57) of both of the half-clips (56) are radially close so as to be able to engage in the openings (22, 22′) of the two elements (20, 20′), and an active second position, in which the two half-clips (56) are retracted inside the hollow body (51) and radially distanced along the spacer (58) such that the hooking lips (57) hang on the outer surface (23) of the second element (20′), on the edge of its opening (22′), to keep the two elements against each other between said lips (57) and the bearing surface (52) on the first element (20),at least in the rest position of the tack (50), the assembly formed by the half-clips (56) and the spacer (58) being, in the cross-section thereof, in the form of a near-perfect circle whose diameter (D) is identical to the inner diameter of the openings (22, 22′) of the two elements (20, 20′) to be assembled, with a minimal clearance to allow said assembly to slide lengthwise into said opening,the hollow body comprising a nearly-spherical ring-shaped centering bearing (80) whose outer diameter corresponds to the inner diameter of at least one of the guide slots on the grid,said centering bearing being held by an external cylindrical surface (51) of the hollow body, or by a hollow cylindrical sheath (90) having an oblong cross-section comprised of two half-cylinders (92) with a radius substantially equal to the outer radius of the hollow body, connected by two planes (94) whose length is equal to the center distance between the two half-cylinders,wherein the tack also has a cap (85) mounted on the nut (54), the outer diameter of said cap being greater than the inner diameter of said guide slot (12). 2. The tack according to claim 1, wherein the cap (85) is mounted on the nut (54) by means of a screw (88), the tightening of this screw (88) attaching the grid (10) to the elements to be assembled (20, 20′). 3. The tack according to claim 1 or claim 1, wherein the spacer (58) is in the shape of a flat blade that has two parallel lengthwise sides (58c) and two convex lateral sides (58d) with an outer radius of curvature identical to the outer diameter of the half-clips (56). 4. The tack according to claim 3, wherein the spacer (58) is provided, at a proximal end (58a), with symmetric chamfers (59) facilitating its engagement between the hooking lips (57) and, at its other end (58b), two symmetrical T-shaped shoulders (60) to fix the spacer (58) in an axial position rotating toward the inside of the hollow body (51). 5. The tack according to claim 1 or claim 2, wherein the half-clips (56) are identical and symmetrical to the elongation axis (XX′). 6. The tack according to claim 1 or claim 2 having a positioning swivel (70) on the bearing surface (52) of the hollow body (51). 7. The tack according to claim 6, wherein the swivel (70) has a ring-shaped centering bearing (72) comprising a spherical convex external surface (73) cooperating with a bearing washer (74) having a spherical concave internal surface (75) complementary to the convex surface (73). 8. The tack according to claim 1 or claim 2, wherein the bearing surface is comprised of a conical centering bearing (78) having an apex of around 90° to 140°. 9. The tack according to claim 1, wherein the hollow body (51) is traversed by a circular opening (52a) that is coaxial to the spherical bearing (80) and whose diameter is identical to the diameter (D) of the assembly formed by the half-clips (56) and the spacer (58). 10. The tack according to claim 1 or claim 2, wherein the assembly formed by the half-clips (56) has an internal space, measured at the level of their free ends (56a), that gradually decreases in the direction of the lips (57) at an angle less than 45°. 11. The tack according to claim 1 or claim 2, wherein the hollow cylindrical body (51) is centered precisely on the opening (22) of one of the elements (20). 12. A method using the tack according to claim 1 or claim 2, at least temporarily, the two elements with coaxial openings to accept a part of said tack. 13. A use of the tack according to claim 1 or claim 2 to accurately position a boring grid on the two elements to be assembled having coaxial openings to accept a part of said tack. 14. The tack according to claim 1 or claim 2, wherein the centering bearing is held by the hollow cylindrical sheath (90) forming a single piece with the cap (85).