Securing element

Abstract

The present invention discloses a securing element that comprises the following: a conical connecting element, which comprises at least one conical connecting head and a threaded portion; and an expansion sleeve, which is mounted on the conical connecting element and integrally connected to an expansion ring, wherein: the expansion sleeve has a cutout along the axial direction thereof such that the expansion sleeve is in the form of a laterally open cylinder; a first edge and a second edge are formed at the cutout; the first edge has a limiting projection and the second edge has a limiting slot; the limiting projection fits together with the limiting slot such that the limiting projection is confined within the limiting slot; and the central portion of the expansion sleeve bulges outwardly in the radial direction thereof and thus forms the sleeve projection. In the present invention, use is made of sleeves and expansion rings that are in one piece, thus achieving a material saving and a cost reduction.

Description

[0001] FASTENING ELEMENT

[0002] TECHNICAL FIELD

[0003] The present invention relates to the technical field of connecting elements and in particular to a fastening element.

[0004] STATE OF THE ART

[0005] With socio-economic development and the improvement of quality of life, people are placing higher demands on the quality of their living environment, which is driving the development of the facade design industry. The use of stone, ceramic, and terracotta tiles on facades is also becoming widespread. In addition, there are stricter requirements for facade safety and construction technology, which is why fasteners are generally used in the construction of stone facades on the exterior of buildings.

[0006] Patent CN204401835U discloses a screw fastener for connection to stone, which belongs to the screw-type fasteners and comprises independent screw sleeves and expansion rings that must be manufactured separately, which is costly and difficult to ensure the vertical positioning of the screw.

[0007] CONTENT OF THE INVENTION

[0008] In view of the above, the object of the present invention is to provide a fastening element.

[0009] This goal is achieved according to the invention by the following technical solution:

[0010] A fastener, wherein the fastener can be anchored in an undercut borehole, comprising: a conical connecting element, wherein the conical connecting element has at least one conical connecting head and a threaded portion; an expansion sleeve, wherein the expansion sleeve is pushed onto the conical connecting element; wherein the expansion sleeve bulges outward in its radial direction to form a sleeve projection.

[0011] Alternatively, a fastening element, wherein the fastening element can be anchored in an undercut borehole, comprising: a conical connecting element, wherein the conical connecting element has at least one conical connecting head and a threaded portion; an expansion sleeve, wherein the expansion sleeve can be plugged onto the conical connecting element and the expansion sleeve is integrally connected to an expansion ring; wherein the conical connecting element is a conical bolt, a conical screw and / or a conical rivet;wherein the expansion sleeve is provided with a cutout along its axial direction, so that the expansion sleeve has the shape of a laterally open cylinder, wherein a first edge and a second edge are formed on the cutout, wherein the first edge is provided with a limiting projection and the second edge with a limiting slot, wherein the limiting projection mates with the limiting slot such that the limiting projection is limited within the limiting slot; wherein the central portion of the expansion sleeve bulges outward in the radial direction and forms a sleeve projection.

[0012] The above-mentioned fastener, wherein the expansion ring comprises: a plurality of expansion structures extending outwardly from an end of the expansion sleeve proximate the bolt head, the plurality of expansion structures being enclosed to form a ring.

[0013] The above-mentioned fastener, wherein each two adjacent spreading structures are provided with a slot on the side near the bolt head to allow the plurality of spreading structures to unfold in a shape of petals as a result of the pressure exerted by the bolt head.

[0014] The above-mentioned fastener, wherein each of the expansion structures is provided with a hole penetrating it in the direction of its thickness. The above-mentioned fastener, wherein the holes are trapezoidal holes, the short side of the trapezoidal holes being located near the bolt head and the long side of the trapezoidal holes being located away from the bolt head.

[0015] The above-mentioned fastener, wherein each of the spreading structures projects outwardly to form a spreading boss.

[0016] The above-mentioned fastening element, wherein the holes are trapezoidal holes, the expanding bosses being arranged on the short side of the trapezoidal holes.

[0017] The above-mentioned fastener, wherein one side of the bolt head projects outwardly to form a bolt boss.

[0018] The above-mentioned fastening element, wherein the expansion sleeve is provided with a recessed pivot point on the inner wall of the side facing away from the bolt head.

[0019] The above-mentioned fastening element, wherein the limiting projection and the limiting slot are both arranged on the sleeve projection.

[0020] The above-mentioned fastener, wherein the sleeve projection is formed with a substantially flat platform in its central portion.

[0021] The above-mentioned fastener, wherein the distance between the surface of the platform and the non-curved surface of the expansion sleeve is half the thickness of the expansion sleeve.

[0022] The above-mentioned fastening element, wherein the platform forms a cavity on the side facing the conical connecting element.

[0023] The above-mentioned fastening element, wherein the length of the sleeve projection in the axial direction is smaller than the length of the expansion sleeve in the axial direction; wherein the length of the sleeve projection in the axial direction is between one-third and one-half of the length of the expansion sleeve in the axial direction.

[0024] The aforementioned fastening element, wherein the expansion sleeve has a thickness equal to the sleeve projection at the end. The aforementioned fastening element, wherein the sleeve projection extends in the entire circumferential direction of the conical connecting element.

[0025] Compared to the prior art, the inventive technology has the following positive effects:

[0026] (1) The invention utilizes one-piece sleeves and expansion rings, enabling material savings and cost reduction. The sleeve of the invention can completely fill the gap of the hole, thus ensuring the vertical positioning of the screw. The nesting structure of the invention can effectively prevent the gap from widening during assembly, enabling a more uniform force application.

[0027] (2) The expansion bosses on the expansion ring according to the invention increase the friction with the plate material.

[0028] (3) The trapezoidal holes of the present invention can make the assembly more labor-saving, and the pivot point can prevent the parts from loosening and falling apart during transportation.

[0029] (4) The recessed design of the sleeve according to the invention at its upper part can effectively reduce the shear stress at the edge of the stone hole, thereby reducing the risk of breakage and falling of the stone slabs and preventing personal injury and property damage. Furthermore, the hollow structure of the sleeve can also help cushion the impact of the load.

[0030] DESCRIPTION OF THE CHARACTERS

[0031] Fig. 1 shows a conical bolt of the fastening element according to the invention in a schematic representation;

[0032] Fig. 2 shows a conical bolt of the fastening element according to the invention in a schematic sectional view;

[0033] Fig. 3 shows a fastening element according to the invention in a schematic representation; Fig. 4 shows a sleeve of the fastening element according to the invention in a schematic representation;

[0034] Fig. 5 shows a fastening element according to the invention in A of Fig. 4 in a partially enlarged schematic representation;

[0035] Fig. 6 shows a sleeve of the fastening element according to the invention in a schematic representation;

[0036] Fig. 7 shows a sleeve of the fastening element according to the invention in a schematic side view;

[0037] Fig. 8 shows a schematic representation of the fastening of the fastening element according to the invention.

[0038] Reference numerals: 1. Tapered bolt; 11. Bolt head; 111. Bolt boss; 12. Threaded portion; 2. Expansion sleeve; 21. Cutout; 211. First edge; 212. Second edge; 213. Limiting projection; 214. Limiting slot; 22. Sleeve projection; 221.

[0039] Platform; 23. Pivot point; 3. Spreader ring; 31. Spreader structure; 311. Slot; 312. Hole; 313. Spreader boss.

[0040] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0041] The technical solutions of the present invention are described clearly and completely below in conjunction with the accompanying drawings. However, it is obvious that the described embodiments represent a portion of the embodiments of the present invention and not all embodiments. Based on the inventive embodiments, all other embodiments that can be realized by those skilled in the art through creative effort also fall within the scope of the present invention.

[0042] In describing the present invention, it is to be understood that the terms "top", "bottom", "left", "right", "inside", "outside", "front", "back", "horizontal", "vertical" and other terms indicating an orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings and are used only to facilitate the description of the present invention and are not intended to indicate or imply that the devices or templates mentioned must have a particular orientation and are therefore not to be understood as a limitation of the present invention.

[0043] It should be particularly noted that the terms "horizontal" and "vertical" are used in the present invention to illustrate the general positional relationship and do not refer to the "horizontal plane" or "vertical plane" in the narrow sense.

[0044] 1 to 8 show a preferred embodiment of a fastening element which is anchored in an undercut borehole and is preferably a plate bolt comprising a conical bolt 1 and an expansion sleeve 2, wherein the conical bolt 1 has at least one conically shaped bolt head 11 and a threaded portion 12 and the expansion sleeve 2 is slipped onto the conical bolt 1.

[0045] Furthermore, in this embodiment, the expansion sleeve 2 of the plate bolt bulges radially outward to form a sleeve projection 22. The sleeve projection 22 can completely fill the gap of the hole and thus ensure the vertical positioning of the screw.

[0046] Preferably, an expansion ring 3 is integrally connected to the expansion sleeve 2.

[0047] Preferably, the conical bolt 1 may further comprise a flat portion 13 arranged between the bolt head 11 and the threaded portion 12.

[0048] It should be particularly noted that, although only bolts are exemplified as fastening means of this type in this embodiment, bolt-like fastening means such as screws, rivets, etc. also fall within the scope of the present invention.

[0049] Furthermore, in a preferred embodiment, the expansion sleeve 2 is provided with a cutout 21 along its axial direction, so that the expansion sleeve 2 has the shape of a laterally open cylinder, wherein a first edge 211 and a second edge 212 are formed on the cutout 21, wherein the first edge 211 is provided with a limiting projection 213 and the second edge 212 is provided with a limiting slot 214, wherein the limiting projection 213 fits together with the limiting slot 214 such that the limiting projection 213 is limited within the limiting slot 214.

[0050] Specifically, the restricting protrusion 213 and the restricting slit 214 both have a fishtail shape, and this fishtail-shaped nesting structure can effectively prevent the gap from widening during assembly, thereby enabling a more uniform force to be applied.

[0051] More specifically, the limiting projection 213 preferably has two beveled or curved edges such that the dimension of the side of the limiting projection 213 remote from the first edge 211 is greater than the dimension of the side of the limiting projection 213 near the first edge 211, thereby allowing the limiting projection 213 to snap into the limiting slot 214.

[0052] The limiting projection 213 can have any shape. It is sufficient if it can limit the displacement along the circumference of the sleeve 2 so that it cannot be released from the limiting slot 214.

[0053] Preferably, the expansion sleeve 2 and the expansion ring 3 are manufactured as a single piece from a 1.5 mm thick stainless steel sheet. It should be noted that "single piece" here means that the expansion sleeve 2 and the expansion ring 3 are joined together by various means. In a further, more specific, and preferred embodiment, "single piece" can also indicate that the expansion sleeve 2 and the expansion ring are formed into one piece during molding and are not subsequently joined together by various joints.

[0054] Preferably, the expansion sleeve 2 and the expansion ring 3 are manufactured as a single unit by stamping sheet metal. More preferably, the limiting projection 213, the limiting slot 214, the sleeve projection 22, the slot 311, the hole 312, and the expansion boss 313 are all stamped and formed from the sheet metal.

[0055] Furthermore, in a preferred embodiment, the central portion of the expansion sleeve 2 bulges outward in its radial direction, thus forming the sleeve projection 22. The expansion sleeve 2 with the sleeve projection 22 can completely fill the gap of the hole and ensure the vertical positioning of the screw. The expansion sleeve 2 has a recessed structure on its upper part, which can effectively reduce the effects of shear stresses on the edge of the hole in the sheet metal.

[0056] Furthermore, in a preferred embodiment, the expansion ring 3 comprises: a plurality of expansion structures 31 extending outwardly from one end of the expansion sleeve 2 near the bolt head 11, wherein the plurality of expansion structures 31 are enclosed to form a ring.

[0057] Furthermore, in a preferred embodiment, each two adjacent spreading structures 31 are provided with a slot 311 on the side near the bolt head 11 to allow the plurality of spreading structures 31 to unfold in a petal shape as a result of the pressure exerted by the bolt head 11.

[0058] Furthermore, in a preferred embodiment, each of the spreading structures 31 is provided with a hole 312 penetrating it in the direction of its thickness.

[0059] Furthermore, in a preferred embodiment, the holes 312 are trapezoidal holes, with the short side of the trapezoidal holes located near the bolt head 11 and the long side of the trapezoidal holes located away from the bolt head 11. The trapezoidal holes can enable easier fastening.

[0060] In a preferred embodiment, each of the spreading structures 31 further projects outwardly to form a spreading boss 313, the spreading bosses 313 increasing the friction with the plate material.

[0061] Furthermore, in a preferred embodiment, the expansion bosses 313 are arranged on the short sides of the trapezoidal holes.

[0062] Preferably, the expansion structure 31 has a greater thickness on the side facing the bolt head 11 than on the side of the expansion structure 31 facing away from the bolt head 11.

[0063] Preferably, the height of the trapezoidal hole is greater than the depth of the slot 311. Specifically, the long bottom surface of the trapezoidal hole is located on top of the slot 311 shown in Fig. 3. Preferably, the spreading structure 31 has a curved outer edge, particularly the outer edge at the bottom of the spreading structure 31 in Fig. 6.

[0064] It should be noted in particular that the above-mentioned features, in particular the features relating to the spreading structure 31, the hole 312 and the spreading boss 313, may optionally be provided individually in some embodiments or in combination with one another in other embodiments.

[0065] Furthermore, in a preferred embodiment, the bolt head 11 protrudes outwards on one side and thus forms a bolt boss 111. The bolt boss 111 facilitates the application of torque during subsequent assembly.

[0066] Furthermore, in a preferred embodiment, the expansion sleeve 2 is provided with a recessed pivot point 23 on the inner wall of the side facing away from the bolt head 11. The pivot point 23 can prevent the parts from becoming loose and falling apart during transport.

[0067] Furthermore, in a preferred embodiment, the limiting projection 213 and the limiting slot 214 are both arranged on the sleeve projection 22.

[0068] Furthermore, in a preferred embodiment, the sleeve projection 22 is formed with a substantially flat platform 221 in its central part.

[0069] Furthermore, in a preferred embodiment, the distance between the surface of the platform 221 and the non-curved surface of the expansion sleeve 2 is half the thickness of the expansion sleeve 2.

[0070] Furthermore, in a preferred embodiment, the platform 221 is formed with a cavity on the side facing the conical connecting element 1, which allows deformation of the platform 211 under the action of pressure and provides space for the deformation.

[0071] Furthermore, in a preferred embodiment, the length of the sleeve projection 22 in the axial direction is smaller than the length of the expansion sleeve 2 in the axial direction.

[0072] Furthermore, in a preferred embodiment, the length of the sleeve projection 22 in the axial direction is between two-thirds and half the length of the expansion sleeve 2 in the axial direction. The length of the sleeve projection 22 can also be only between one-third and half the length of the expansion sleeve 2. Furthermore, in a preferred embodiment, the expansion sleeve 2 has the same thickness at the end as the sleeve projection 22.

[0073] Furthermore, in a preferred embodiment, the sleeve projection 22 extends in the circumferential direction around the conical connecting element 1.

[0074] In other words, the sleeve projection 22 extends in the entire circumferential direction. Specifically, the sleeve projection 22 is expanded or substantially expanded over the entire circumferential direction of the expansion sleeve 2, and in particular, when the expansion sleeve 2 forms a round limiting projection 213, which is then inserted into the limiting slot 214, the sleeve projection 22 extends, in particular continuously, over the entire circumferential direction.

[0075] Furthermore, it should be particularly noted that each of the above-mentioned features of the present invention can be freely combined to realize a variety of embodiments.

[0076] The above explanations represent only preferred embodiments of the present invention and are not intended to limit the embodiment and scope of the present invention. Those skilled in the art should be able to recognize that all solutions achieved by applying the equivalent substitutions and obvious modifications presented in the description and drawings of the present invention should be included within the scope of the present invention.

Claims

PATENT CLAIMS 1. Fastening element, wherein the fastening element is in an undercut Borehole can be anchored, characterized in that it comprises: a conical connecting element (1), wherein the conical connecting element (1) has a conically shaped connecting head (11) and a threaded portion (12), an expansion sleeve (2), wherein the expansion sleeve (2) can be plugged onto the conical connecting element (1), wherein the expansion sleeve (2) bulges outwards in its radial direction to form a sleeve projection (22).

2. Fastening element according to claim 1, characterized in that the expansion sleeve (2) is provided with a cutout (21) along its axial direction, so that the expansion sleeve (2) has the shape of a laterally open cylinder, wherein a first edge (211) and a second edge (212) are formed on the cutout (21), wherein the cutout (21) is a contact area in which the first edge (211) and the second edge (212) overlap, wherein the first edge (211) is provided with a limiting projection (213) and the second edge (212) is provided with a limiting slot (214), wherein the limiting projection (213) fits together with the limiting slot (214) such that the limiting projection (213) is limited within the limiting slot (214).

3. Fastening element according to claim 2, characterized in that the limiting projection (213) and the limiting slot (214) are both arranged on the sleeve projection (22).

4. Fastening element according to claim 1, characterized in that the expansion sleeve (2) is integrally connected to an expansion ring (3).

5. Fastening element according to claim 4, characterized in that the expansion ring (3) comprises: a plurality of expansion structures (31) extending outwards from the end of the expansion sleeve (2) near the connecting head (11), the plurality of expansion structures (31) being enclosed to form a ring, each two adjacent expansion structures (31) being provided with a slot (311) on the side near the connecting head (11), each expansion structure (31) expanding outwards in a radial direction due to the movement of the expansion sleeve (2) against the connecting head (11), each of the expansion structures (31) being provided with a hole (312) penetrating it in the direction of its thickness.

6. Fastening element according to claim 5, characterized in that the holes (312) are trapezoidal holes, the short side of the trapezoidal holes being arranged close to the connecting head (11) and the long side of the trapezoidal holes being arranged away from the connecting head (11), each of the spreading structures (31) projecting outwards to form a spreading boss (313), the spreading bosses (313) being arranged on the short side of the trapezoidal holes.

7. Fastening element according to claim 1, characterized in that one side of the connecting head (11) projects outwards to form a connecting boss (111).

8. Fastening element according to claim 1, characterized in that the expansion sleeve (2) is provided with a recessed pivot point (23) on the inner wall of the side facing away from the connecting head (11).

9. Fastening element according to claim 1, characterized in that the sleeve projection (22) is formed in its central part with a substantially flat platform (221).

10. Fastening element according to claim 9, characterized in that the distance between the surface of the platform (221) and the non-curved surface of the expansion sleeve (2) is half the thickness of the expansion sleeve (2).

11. Fastening element according to claim 9, characterized in that the platform (221) forms a cavity on the side facing the conical connecting element (1).

12. Fastening element according to claim 1, characterized in that the length of the sleeve projection (22) in the axial direction is smaller than the length of the expansion sleeve (2) in the axial direction, wherein the length of the sleeve projection (22) in the axial direction is between two thirds and half the length of the expansion sleeve (2) in the axial direction.

13. Fastening element according to claim 1, characterized in that the expansion sleeve (2) has at the end the same thickness as the sleeve projection (22).

14. Fastening element according to claim 1, characterized in that the sleeve projection (22) extends in the circumferential direction around the conical connecting element (1).

15. Fastening element according to claim 14, characterized in that the sleeve projection (22) extends in the entire circumferential direction.

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