anchor

Abstract

To provide an anchor for ALC which does not rust at all.SOLUTION: The anchor is premised on an anchor in which a plurality of slits are provided at equal intervals in the circumferential direction from the axial center to the tip of a cylindrical anchor body, with adjacent slits forming a biting foot, an expandable member inserted into the tip of the anchor body, and a female screw is provided at the rear end as a fixing portion for a fixed member. The anchor body is molded from resin and reinforced with a reinforcing metal fitting. The reinforcing metal fitting is configured to include reinforcing feet in the same number as the biting feet, each having a shape corresponding to the inside of the biting feet, and connecting rings that connect the reinforcing feet to each other at the rear end side of the plurality of reinforcing feet. The reinforcing metal fitting has a reinforcing structure in which reinforcing feet run along the inside of the biting feet of the anchor body and the connecting ring is positioned at the base of the biting feet, and the diameter of the connecting ring is made smaller than the diameter of the female screw of the mounting portion to form a step at the tip position of the female screw, and the step receives a driving jig.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an anchor for ALC, and more particularly to a resin anchor. [Background technology]

[0002] As an anchor for ALC (lightweight aerated concrete), a structure with three biting prongs at the tip, as shown in Utility Model Publication No. 4-50727 (Figure 5), is used.

[0003] A plurality of slits 110 are formed at equal intervals in the circumferential direction from the center of a metal (e.g., iron) cylindrical body 100 to the axial tip, and a biting foot 120 is formed between adjacent slits. The biting foot 120 forms a taper that becomes thinner toward the tip, and the tip of the plurality of biting feet 120 is fitted with a diameter expansion member 20.

[0004] When the above anchor is driven into ALC using a dedicated driving drill, the biting legs 120 bite into the ALC. At this time, the expanding member 20 spreads the biting legs 120 and opens them inside the ALC, so that it functions as an anchor.

[0005] The fixing member 130 provided at the rear end of the anchor fixed in this manner is used to fix an object to be fixed. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Publication number 4-50727 Summary of the Invention [Problem to be solved by the invention]

[0007] The above conventional anchors can be strongly fixed to ALC, making them useful as building materials and frequently used, but they are mainly made of iron and tend to be somewhat susceptible to rust.

[0008] Since most of the body is buried in ALC after installation, rust will not occur under normal conditions. However, in areas close to the sea or in humid environments, salt water or moisture may occasionally get in through the gap between the anchor and the ALC, causing rust.

[0009] It is possible to use stainless steel, which is a material that does not rust easily, but due to the difference in material, the manufacturing process is also significantly different, and the price is about 10 times that of iron. This price is not appropriate for this type of anchor, which is used in large quantities. Also, even stainless steel does not mean that it will not rust at all; it can rust if exposed to strong salt or steam.

[0010] If resin is selected as the material, rust will not occur, but the strength will not be sufficient and the biting feet may break when hammered in.

[0011] The present invention has been proposed in view of the above-mentioned conventional circumstances, and has an object to provide an anchor for ALC that will not rust at all by combining iron and resin, which are rust-resistant materials. [Means for solving the problem]

[0012] The present invention is based on an anchor having a plurality of slits equally spaced circumferentially from the axial center to the tip of a cylindrical anchor body, with adjacent slits forming bite feet, an expandable member inserted into the tip of the anchor body, and a female thread at the rear end that serves as a fixing part for a fixed member.

[0013] In the present invention, the anchor body is molded from resin and reinforced with a reinforcing metal fitting.

[0014] The reinforcing metal fitting is configured to include reinforcing feet of the same number as the digging-in feet having a shape corresponding to the inside of the digging-in feet, and connecting rings that connect the reinforcing feet to each other at the rear ends of the reinforcing feet.

[0015] The reinforcing metal fitting has a reinforcing foot that runs along the inside of the biting foot of the anchor body, and the connecting ring is positioned at the base of the biting foot to form a reinforcing structure. The diameter of the connecting ring is made smaller than the diameter of the female thread of the mounting part, forming a step at the tip position of the female thread, and the driving jig is received at this step. Effect of the Invention

[0016] As described above, the present invention forms a composite body with a resin body and a metal (iron) reinforcing metal fitting, which provides the combined effect of resin and metal. That is, when driven into ALC, the metal's strength allows it to bite into the ALC, and this strength also increases the pull-out strength. In addition, since the reinforcing metal fitting is wrapped in the resin body, it has the effect of preventing rust even when used in ALC buildings in coastal areas or high humidity environments. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is an exploded perspective view of the present invention. [Diagram 2] FIG. 2 is an axial longitudinal cross-sectional view of the present invention. [Diagram 3] FIG. 2 is a diagram showing the relationship between the present invention and a driving jig. [Figure 4] 1 is a photograph showing the ALC anchor of the present invention being driven into ALC. [Diagram 5] FIG. 1 is a perspective view showing a conventional ALC anchor. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] FIG. 1 shows a perspective view of the present invention, and FIG. 2 shows an axial cross-sectional view thereof.

[0019] A resin anchor body having an external shape similar to that of a conventional metal anchor shown in FIG. 5 is formed by injection molding.

[0020] That is, a plurality of slits 11 are provided at equal intervals in the circumferential direction from the axial center to the tip of the resin cylindrical body 10. A biting foot 12 is formed between adjacent slits.

[0021] The rear end of the cylindrical body 10 is internally formed with a female screw of a predetermined depth, and is provided with a fixing portion 13 to which a member to be fixed is fixed.

[0022] Each of the digging legs 12 is tapered so that it becomes thinner in stages (three stages in the drawing) toward the axial end of the cylindrical body 10, and the end has a pointed triangular shape. This makes it easier for the digging legs 12 to dig into the ALC during driving, which will be described later.

[0023] In addition to the cylindrical body 10, the following reinforcing metal fittings are prepared.

[0024] The reinforcing metal fitting 30 is a metal pipe that corresponds to the inner diameter of the cylindrical body 10, with the rear end formed as a connecting ring 33, and is shaped to correspond to the inside of the biting feet 12, with the same number of reinforcing feet 32 ​​formed as the biting feet 12.

[0025] That is, the reinforcing metal fitting 30 has axial cuts 31 at positions corresponding to the plurality of slits 11 in the axial direction of the metal pipe, and the spaces between the adjacent cuts form reinforcing legs 32. The plurality of reinforcing legs 32 are connected by a connecting ring 33 at the rear end of the reinforcing metal fitting.

[0026] The reinforcing metal fitting 30 thus constructed is disposed inside a mold for molding the cylindrical body 10, and in this state, resin is injected into the mold. As a result, the reinforcing foot 32 comes into close contact with the inside of the biting foot 12, becoming integrated with the biting foot 12, and the connecting ring 33 is positioned at the tip side of the female screw of the fixing portion 13.

[0027] The diameter of the connecting ring 33 is smaller than the diameter of the female screw of the fixing portion 33, and a step 40 is formed between the connecting ring 33 and the tip position of the female screw of the fixing portion 33. As will be described later, the driving jig 50 is received by the step 40.

[0028] Each reinforcing leg 32 is provided with a number of small holes 34 in the axial direction, and the resin injected into the mold as described above enters the small holes 34, thereby completely integrating the metal reinforcing bracket 30 and the resin tubular body 10 to form a composite body that will not peel off.

[0029] A diameter expanding member 20 is fitted to the tip of the biting foot 12 as in the conventional art, and the biting foot 12 bites into the ALC while expanding its diameter during driving.

[0030] Fig. 3 shows the relationship between the anchor of the present invention and a driving jig 50. The tip 51 of the driving jig 50 shown in Fig. 3(a) is brought into contact with the step 40 at the tip of the fixing part 13 of the anchor of the present invention as shown in Fig. 3(b), and the driving operation is performed with a driving drill.

[0031] If a large force is applied to the resin part during this driving operation, the resin part may be damaged, and as a result the anchor may not function properly. Therefore, when driving the anchor, only the tip 51 of the driving jig 50 is brought into contact with the step 40, and the other parts do not touch the resin part.

[0032] FIG. 4 is a photograph showing the state in which the anchor of the present invention, which has an iron reinforcing metal fitting 30 covered with a polycarbonate cylindrical body 10, has been driven into ALC.

[0033] As described above, the rear end of the connecting ring 33 of the biting foot 12 receives the tip of the driving jig 50, so that the biting foot 12 is firmly driven into the ALC, and the pull-out strength is also high due to the stiffness of the reinforcing metal fitting 30. Furthermore, since the reinforcing metal fitting 30, which is made of iron, is enclosed in the plastic cylindrical body 10, it is not exposed to the outside air and will not rust.

[0034] If an anchor is made only of a resin cylinder and driven into ALC, the biting part may break, rendering it useless as an anchor. Or, even if the biting part does not break and the anchor is driven into ALC, it does not have the strength of metal, so it has low pull-out strength and cannot withstand large loads.

[0035] In this regard, the present invention exerts the combined effect of a composite body formed by combining a plastic tubular body with an iron reinforcing metal fitting, i.e., the effect of the resin being rust-proof and the effect of the metal being strong, making it possible to obtain an anchor for ALC that is more effective than stainless steel. [Explanation of symbols]

[0036] 10(100) Cylindrical body 11(110) Slit 12(120) Digging Legs 13(130) Fixed part 20 Expanding member 30 Reinforcement bracket 31 Cutting 32 Reinforcement foot 33 Connecting ring 34 Small hole 40 steps 50 Driving jig 51 Tip of the driving jig

Claims

[Claim 1] An anchor having a cylindrical anchor body with a plurality of slits equally spaced circumferentially from the axial center to the tip, with adjacent slits forming bite legs, an expandable member inserted into the tip of the anchor body, and a female screw at the rear end as a fixing portion for a fixed member, The anchor body is made of resin; A reinforcing metal fitting including reinforcing feet having the same number as the reinforcing feet having a shape corresponding to the inside of the reinforcing feet, and connecting rings connecting the reinforcing feet to each other at the rear end sides of the reinforcing feet; a reinforcing structure in which the reinforcing metal fitting is disposed on the inside of the anchor body so that the reinforcing foot is aligned with the inside of the biting foot; The diameter of the rear end of the connecting ring of the reinforcing metal fitting is smaller than the inner diameter of the female screw, and a driving receiving step is formed at the tip position of the female screw. An anchor comprising:

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