JPH0444700Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an insert fitting for horizontal suspension that is horizontally buried in the side wall of a concrete U-shaped groove, box, etc.

(Prior Art) As a conventional art, there is one shown in FIGS. 4 and 5.

In FIG. 4 and FIG. 5, 1 is an insert fitting formed in a bottomed cylindrical shape from a metal material;
A female thread 2 is formed on the inner periphery to which the shaft portion 4a of the hanging jig 4 is threadedly fitted.

As shown in FIG. 5, the metal insert 1 is placed horizontally and buried in the side wall of a U-shaped groove 3 made of concrete during molding.

Reference numeral 4 designates a hanging jig 4 made of an eye bolt, which integrally includes a shaft portion 4a having a thread 4b formed on the outer periphery and a ring portion 4c curved into a ring shape.

Then, the shaft portion 4a of the hanging jig 4 is inserted into the U-shaped groove 3.
screw into the insert fitting 1 buried in the
A hook (A) of a crane or the like is hung on the ring portion 4c, and the U-shaped groove 3 is lifted up and moved to a predetermined location by the crane.

(Problems to be Solved by the Invention) In the conventional device described above, a female thread 2 into which the shaft portion 4a of the hanging jig 4 is screwed is formed on the inner periphery of the insert metal fitting 1.
There was a drawback that it required a lot of effort to attach the hanging jig 4 to the.

In order to solve this problem, the shaft portion 4a of the hanging jig 4
If the outer diameter of the male thread is smaller than the inner diameter of the female thread of the metal insert 1, the strength of the shaft portion 4a will be insufficient.

Furthermore, if the outer circumferential surface of the shaft portion 4a is made a smooth surface and is slidably fitted into the insert fitting 1, the outer circumferential surface of the shaft portion 4a will be damaged by the sharp ridges of the female thread 2, resulting in stress concentration. It had drawbacks such as being warped and easily broken.

The object of the present invention is to obtain a novel insert fitting for horizontal suspension that eliminates the above-mentioned drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention is constructed as follows.

That is, in the insert fitting for horizontal suspension, in which a bottomed cylindrical insert fitting into which the shaft of the hanging jig fits is provided at the axial center, and this insert fitting is horizontally buried in the side wall of the concrete molded product, The insert metal fitting has an inner circumferential diameter slightly larger than the outer diameter of the shaft of the hanging jig, and has a configuration in which the inner circumference has a flat ridge cut to form an internal thread. be.

(Function) Since the present invention has the above structure, when the shaft of the hanging jig is fitted to the insert, the flat crest of the female thread of the insert comes into contact with the outer peripheral surface of the shaft. I will do it.

Furthermore, when the shaft portion moves in the axial direction within the metal insert, the ridges of the crests and valleys of the female thread of the metal insert engage with the outer periphery of the shaft portion.

(Example) Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, Fig. 1 is a sectional view of an insert fitting showing an embodiment of the present invention, Fig. 2 is a sectional view of the insert fitting attached to a formwork, and Fig. 3 is a sectional view of a hanging jig attached to the buried insert fitting. FIG. 3 is an enlarged cross-sectional view of the main part in an attached state.

In Fig. 1, 5 is an insert metal fitting;
The metal insert 5 consists of a main body 6 made of metal and a spacer 10 made of soft plastic.

The main body 6 is formed into a cylindrical shape with a bottom, and its inner periphery is formed to have a slightly larger diameter than the outer diameter of the shaft portion 4a of the hanging jig 4 shown in FIG. A flat female thread 7 is formed with a shallow V-shape in the valley portion 7b, and a small diameter engagement hole 8 is formed in the axial center of the left end wall. Note that the pitch of the female thread 7 is determined by the hanging jig 4.
The pitch corresponds to the pitch of the external thread 4b formed on the shaft portion 4a (FIG. 3).

Further, the spacer 10 has a protruding end portion 10a.
(left end) is formed into a conical shape with a small diameter,
A small-diameter protrusion 10b is formed protruding rightward at the axial center of the bottom (right side), and the protrusion 10b is press-fitted into the engagement hole 8 formed in the main body 6 to form the spacer 1.
0 is integrally fixed to the main body 6.

Further, the length L2 of the metal insert 5 is formed to be slightly longer than the width L1 of the molding chamber 14 to be used later.

The metal insert 5 is attached to a formwork 11 to be filled with fresh concrete, as shown in FIG.

That is, by arranging the inner frame 12 and the outer frame 13 vertically apart from each other in the left-right direction, a molding chamber 14 having a width L1 is formed between them, and a through hole 13a is formed through the right outer frame 13. In addition, this through hole 1
A nut 15 is welded and fixed to the periphery of 3a facing outward.

Further, the support bolt 16 is screwed into the nut 15 from the outside, so that its right side is largely exposed inside the molding chamber 14.

The support bolt 16 has a small diameter shaft part 16b integrally formed at the tip (right part) of the threaded part 16a, and the above-mentioned insert is attached to the threaded part 16a and the small diameter shaft part 16b exposed in the molding chamber 14. The metal fittings 5 are loosely fitted and supported horizontally, and an outer frame 13 and an inner frame 12 are attached to the right end of the main body 6 and the left end of the spacer 10.
Press them together.

Then, by filling fresh concrete into the molding chamber 14 and hardening it, a concrete molded product (U-shaped groove) 17 in which the metal insert 5 is embedded is obtained, as shown in FIG.

In addition, in FIG. 3, 4 is a hanging jig fitted into the insert fitting 5, 4a is a shaft part of the hanging jig, and 4b
is a male thread formed on the outer periphery of the shaft portion 4a, and these have the same structure as the one shown in FIG.

Next, the functions and effects of the above embodiment will be explained.

The inner diameter of the insert fitting 5 embedded in the concrete molded product 17 is formed to be slightly larger than the outer diameter of the shaft portion 4a of the hanging jig 4.
The shaft portion 4a can be fitted into or removed from the insert fitting 5 without rotating the hanging jig 4, and the hanging jig 4 can be quickly fitted into or removed from the insert fitting 5.

Then, when the hook of the crane is locked to the ring part 4c of the lifting jig 4 fitted into the insert metal fitting 5 and pulled upward, the shaft of the lifting jig 4 will move as shown in FIG. The outer side of the portion 4a is inclined upward in the insert fitting 5, and a crest 4b-1 on the upper side of the external male thread 4b of the shaft portion 4a and a crest on the lower side of the male thread 4b on the inner side of the axial portion 4a (not shown) is engaged with the valley portion 7b of the female thread 7, thereby preventing the shaft portion 4a from moving outward in the axial direction with respect to the metal insert 5.

In addition, in the hanging jig 4 in which the shaft portion 4a is formed into a smooth rod shape, the outer circumferential surface of the shaft portion 4a contacts the flat peak portion 7a of the metal insert 5, and when a load is generated, the shaft portion 4a is Stress concentration no longer occurs on the outer circumferential surface, and when the shaft portion 4a attempts to move axially outward within the metal insert 5 in this state, the crests 7a and troughs 7b of the female thread 7 of the metal insert 5 The ridge portion 7c engages with the outer periphery of the shaft portion 4a, thereby preventing outward movement in the axial direction.

(Effects of the invention) As is clear from the above explanation, the present invention allows the hanging jig to be quickly attached and detached from the insert metal fitting, and when a load is generated when suspending a concrete molded product, the shaft of the hanging jig It is possible to prevent stress concentration from occurring in the shaft portion, and also to prevent the shaft portion from accidentally falling off from the insert fitting, resulting in improved workability and safety.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of an insert fitting showing an embodiment of the present invention, Fig. 2 is a cross-sectional view of the insert fitting attached to the formwork, and Fig. 3 is a state in which a hanging jig is attached to the buried insert fitting. FIG. 4 is a sectional view of a conventional insert fitting, and FIG. 5 is a sectional view corresponding to FIG. 3. 4... Hanging jig, 4a... Shaft part, 4b... Male thread, 4c... Ring part, 5... Insert metal fitting,
6...Main body, 7...Female thread, 7a...Mountain part, 7b
...Trough, 7c...Ridge, 8...Engagement hole, 10...
...Spacer, 10a...Protruding end, 10b...Protrusion, 11...Formwork, 12...Inner frame, 13...Outer frame, 13a...Through hole, 14...Molding chamber, 15...
...Nut, support bolt, 16a...Threaded part, 16
b...Small diameter shaft portion, 17...Concrete molded product.

Claims (1)

[Scope of utility model registration request] In the insert fitting for horizontal suspension, the insert fitting is provided with a bottomed cylindrical insert fitting into which the shaft portion of the hanging jig fits in the axial center portion, and the insert fitting is horizontally buried in the side wall of the concrete molded product. The metal fitting has an inner circumferential diameter slightly larger than the outer diameter of the shaft of the hanging jig, and a flat crest is cut on the inner circumference to form an internal thread. insert metal fittings.