TWI737886B - An expansion anchor used for a thin board - Google Patents

Abstract

The invention relates to an expansion anchor (1) for use in, for example, a riser panel (15). The present invention proposes that the expansion anchor (1) is configured with a through hole (6) as the core hole of the internal thread (8), and the internal thread (8) is not penetrated. This avoids, for example, a screw threaded through the expansion anchor (1) and the screw protruding from the front end (4) and thereby avoids standing on the bottom of the undercut blind hole (16). Damage to the panel (15).

Description

Expansion anchor for thin plates

The present invention relates to an expansion anchor with the characteristics of the preamble of the first item of the scope of patent application, which is especially arranged for anchoring in a thin plate.

European patent application EP 1150 024 A1 discloses an expansion anchor for anchoring in a thin plate (ie, for example, a vertical panel made of stone). Known expansion anchors are anchored in a blind hole with an undercut of a cylindrical section that transitions into a tapered undercut at the bottom of the blind hole. The known expansion anchor has a cylindrical shape, which transitions into a tapered expansion part and is penetrated by a coaxial through hole with an internal thread. In a thin plate, the remaining thickness of the plate between the bottom of the blind hole and the opposite outer side of the plate is small. There is a danger that the bolt or screw screwed into the internal thread of the through hole of the known expansion anchor is not only screwed in but also screwed through, and abuts against the expansion anchor to be or has been anchored in One of the blind holes is on the bottom. Here, the bolt or screw may penetrate the plate on the bottom of the blind hole.

The task of the present invention is to propose an expansion anchor of the aforementioned type, which avoids penetrating the bottom of a blind hole in which the expansion anchor is anchored.

According to the invention, this task is solved by the features of claim 1. The expansion anchor according to the present invention has a through hole with an internal thread. The through hole extends longitudinally in the direction of the longitudinal axis and extends completely until the end of the front part passes through the expansion anchor. However, according to the present invention, the internal thread does not extend to the end of the front part. Instead, an unthreaded section is constructed between the end of the front part and the internal thread. The terms "front" and "rear" refer to the insertion direction of inserting the expansion anchor into the blind hole according to the plan. Therefore, when the through hole completely penetrates the anchor opening from the rear end in the insertion direction toward the front end in the insertion direction, the internal thread according to the present invention terminates before the front end in the insertion direction of the expansion anchor. , Or gradually lost before the end of the front. The latter means that the height of the internal thread is reduced to zero. The non-penetrating internal thread prevents the screw or the screw from passing through the expansion body to be screwed through and protruding at the end of the front part. In this way, damage to the bottom of the blind hole can be avoided.

The diameter of the unthreaded section of the through hole of the expansion anchor according to the invention is as large as the inner diameter of the internal thread according to the invention. The diameter of the through hole in the unthreaded section is the core diameter of the internal thread. In particular, the "diameter of the through hole" refers to the maximum inner diameter of the through hole outside the internal thread and in the unthreaded section, where possible transitions or chamfers or rounds are not considered. If the pitch of the internal thread and the possible chamfer at the orifice are ignored, the through hole is cylindrical, the through hole has a constant diameter and a circular cross section over its entire length.

The expansion anchor according to the present invention is especially used for anchoring in undercut blind holes of thin plates (for example, vertical panels made of stone). "Thin" means that the board is only a fraction of the depth of the blind hole that is greater than the depth of the blind hole undercut. Since the remaining thickness of the plate at the bottom of the blind hole is small, if the expansion anchor allows the screw and the screw to be screwed through and out at the front end of the expansion anchor facing the bottom of the blind hole, there will be penetration. The risk of penetration, the non-penetrating internal thread of the expansion anchor according to the present invention avoids this risk. However, the expansion anchors according to the present invention can also be anchored in undercut blind holes in thick plates or other anchor bases.

In order to expand, for example, an expansion ring or a sleeve, the expansion anchor according to the present invention has an expansion portion at its front end, in which the expansion anchor is at least partially in the longitudinal direction, and that is In particular, it expands radially in the direction of insertion in the blind hole. In particular, the expansion anchor expands conically, but it can also expand in a wedge or pyramid shape or with one or more steps. This list is for illustration and is not exhaustive. The expansion ring or expansion sleeve can be pushed onto the expansion part of the expansion anchor or The expansion part is pulled into the expansion ring or expansion sleeve for expansion, which can also be understood as the expansion of the expansion ring, expansion sleeve and/or expansion anchor. In order to anchor in the undercut drilled hole, the expansion ring or expansion sleeve is expanded in the undercut and the expansion anchor is held in the form of form-locking, that is, anchored in the undercut of the blind hole .

Generally, the expansion ring or expansion sleeve can also be understood as an expansion element that can move in the longitudinal direction of the through hole relative to the expansion portion. The expansion element may be closed in the circumferential direction or have an opening, such as a through slit. For the purpose of expansion, the expansion sleeve may also have one or preferably a plurality of non-through slits. The expansion ring can be wave-shaped for expansion. The expansion is achieved via the relative movement of the expansion element with respect to the expansion part, that is, expansion is carried out by pulling the expansion part into the expansion element or, in the same sense, by pushing the expansion element onto the expansion part.

Preferably, the expansion element is not slotted. It is also preferred that the expansion anchor is not slotted in the section of the expansion part.

1: Expand the anchor

2: flange

3: Expansion part

4: The end of the front

5: The end of the rear

6: Through hole

7: chamfer

8: Internal thread

9: Outlet of internal thread 8

10: Expand the ring

11: Expand the components

12: Ring

13: splice

14: Sliding sleeve

15: Thin plate

16: blind hole

17: Undercut

18: Screw

19: Nut

20: bottom

Next, the present invention will be explained in detail based on the embodiments shown in the drawings. Shown in the drawings: Figure 1 shows an axial cross-section of the expansion anchor according to the present invention in an unexpanded state; Figure 2 shows the expansion anchor in Figure 1 in view; and Figure 3 shows the expansion in a half-sectional view The expansion anchors from Figures 1 and 2 that are opened and anchored to the thin plate.

The expansion anchor 1 according to the present invention shown in the drawings has a cylindrical flange 2 to which a tapered expansion portion 3 is integrally connected, and the expansion anchor 1 radially expands in the expansion portion . The expansion 3 ends on the front end 4 of the expansion anchor and the flange 2 ends on the rear end 5 of the expansion anchor 1. end. The expansion anchor 1 is penetrated by a cylindrical and coaxial through hole 6 which penetrates or penetrates the expansion anchor 1 completely up to the front end 4 and extends over its entire length, except for the expansion anchor 1 Outside of the chamfer 7 on the orifice of the through hole 6 on the rear end 5, it has a constant diameter and a constant circular area as a cross-sectional area. The through hole 6 has an internal thread 8, which differs from the through hole 6 in that the internal thread 8 does not extend to the front end 4, that is to say does not penetrate, but at the front end of the expansion anchor 1. Part 4 was gradually lost. The outlet of the internal thread 8 is identified by the reference numeral 9. The through hole 6 has the inner diameter of the internal thread 8 as a diameter, which can be understood as the core hole of the internal thread 8.

Then the expansion part 3 is on the outside of the expansion anchor 1, the expansion ring 10 is arranged on the flange 2 in an axially movable manner, and the expansion ring surrounds the flange 2. The expansion ring 10 can also be generally understood as an expansion element 11. The expansion ring 10 has a surrounding circular ring 12 in a radial plane, and a tab 13 integral with the circular ring protrudes from the circular ring in the direction of expanding the expansion portion 3 of the anchor 1. This design solution of the expansion ring 10 is not mandatory for the present invention. In addition to the expansion ring 10, other expansion elements can also be considered, such as a slotted or non-slotted expansion sleeve (not shown).

On the side of the expansion ring 10 facing away from the expansion portion 3 of the expansion anchor 1, the sliding sleeve 14 is arranged on the flange 2 of the expansion anchor 1 in an axially movable manner. As can be seen in FIG. 1, when the expansion ring 10 is not expanded, the sliding sleeve 14 axially protrudes beyond the rear end 5 of the expansion anchor 1.

In order to be anchored in the board 15 (for example, a vertical panel made of stone), the expansion anchor 1 is inserted into a cylindrical blind hole 16 in the board 15, which has a hole on the bottom of the blind hole 16 The undercut 17 is a tapered expansion. The blind hole 16 with the undercut 17 can also be understood as an anchor hole. The expansion part 3 and the front end part 4 are in front of the insertion direction of the expansion anchor 1 into the blind hole 16. The expansion ring 10 is pushed onto the expansion part 3 of the expansion anchor 1 via the sliding sleeve 14. In this case, the expansion part 3 pushes the tab 13 of the expansion ring 10 outward into the rear insert part in the undercut 17 of the blind hole 16, as can be seen in FIG. 3. The expansion anchor 1 engages the undercut 17 of the blind hole 16 via the tab 13 of the expansion ring 10 and in this way is held in the plate 15 via form-locking, which can also be referred to as anchoring the expansion anchor 1 In the board 15. Splices 13 can also be squeezed apart It can be understood as the expansion of the expansion ring 10 or the expansion anchor 1.

As shown in Figure 2, in order to push the sliding sleeve 14 onto the expansion anchor 1 and push the expansion ring 10 onto the expansion part 3, the screw 18 can be screwed into the internal thread 8 of the expansion anchor 1 and used The sliding sleeve 14 is moved by the nut 19 screwed on the screw 18. The internal thread 8 that is not through, but terminates before the front end 4 of the anchor 1 is expanded, prevents the screw 18 from being screwed through the expansion anchor 1 and protruding over the front end 4. This prevents the screw 18 from hitting the bottom 20 of the blind hole 16. This prevents the screw 18 in the thin plate 15 from penetrating the plate 15 on the bottom 20 of the blind hole 16. As can be seen in Figure 3, the expansion anchor 1 is anchored in the plate 15 with the expanded expansion ring 10, so that there is one or another screw 18 screwed into the internal thread 8 of the expansion anchor 1, not shown Screws or other threaded elements can be fixed to, for example, a building wall. The internal thread 8 that does not penetrate but terminates before the front end 4 of the anchor 1 is expanded prevents the situation that such a threaded element screwed into the internal thread 8 from expanding on the front end 4 The plate 15 on the bottom 20 of the blind hole 16 protrudes from the open anchor 1 and damages.

1: Expand the anchor

2: flange

3: Expansion part

4: The end of the front

5: The end of the rear

6: Through hole

7: chamfer

8: Internal thread

9: Outlet of internal thread 8

10: Expand the ring

11: Expand the components

12: Ring

13: splice

14: Sliding sleeve

Claims (5)

An expansion anchor (1) for anchoring in the undercut blind hole (16), used for anchoring in a thin plate (15), wherein the expansion anchor (1) has an internal thread (8) A through hole (6), wherein the through hole (6) penetrates the expansion anchor (1) completely in the longitudinal direction up to the front end (4), and is characterized in that the internal thread (8) does not extend to The front end (4) of the through hole (6), but an unthreaded section is constructed between the front end (4) and the internal thread (8), which has a through hole (6) The diameter is as large as the inner diameter of the internal thread (8). The expansion anchor (1) according to item 1 of the scope of patent application, wherein the expansion anchor (1) has an expansion part (3) at the end of its front part, and the expansion part (3) is The expansion anchor (1) is at least partially radially expanded. The expansion anchor (1) according to the second item of the scope of patent application, wherein the expansion anchor (1) has an expansion element (11) which can be expanded to the expansion part by pushing (3) On. The expansion anchor (1) according to item 3 of the scope of patent application, wherein the expansion element (11) is not slotted. The expansion anchor (1) according to any one of items 1 to 4 in the scope of the patent application, wherein the expansion anchor (1) is not slotted in the area of the expansion portion (3).

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