JP3070660U - Lock bolt rust prevention device - Google Patents

Abstract

(57) [Summary] [Problem] To insert a plate 3, a receiving member 5 made of an iron casting, and a pressing member 7 also made of an iron casting into a lock bolt 1, and screw these to the lock bolt 1. The nut 9 is pressed and an oil cap 12 is attached to the receiving member 5.
In the conventional lock bolt rust preventive device in which the oil cap 12 is screwed onto the receiving member 5, the receiving member 5 and the pressing member 7 are co-rotated to form the left-handed lock bolt 1. In some cases, the tightening force was loosened. SOLUTION: An inverted conical receiving portion 5a is formed on an upper surface of a receiving member 5 made of an aluminum alloy, and a rubber packing 11 for preventing slip is attached to a bottom surface. On the other hand, the pressing member 7 has a pressing portion 7a having a hemispherical convex surface and a nut portion 9 integrally formed of an iron casting. Thereby, the co-rotation described above can be eliminated.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a rust prevention device for a lock bolt that fixes and holds the surface of a ground or the like.

[0002]

[Prior art]

 Conventionally, as a rust prevention device for a lock bolt for fixing and holding the surface of a ground or the like, as shown in FIG. 3, a self-drilling bolt having a left-hand thread formed in a hole B drilled in a ground A or a right-handed bolt A normal bolt (hereinafter, referred to as a lock bolt) 1 having a screw formed therein is inserted, a grout material C is injected into the hole B, and the lock bolt 1 is fixed. By inserting the through hole 4 of the plate 3 and the through hole 6 of the receiving member 5 in order into the outer projecting portion 1 and then screwing the pressing member 7 to the lock bolt 1, From the pressing force. In this case, a receiving portion 5a having a hemispherical concave surface is formed on the receiving member 5 side so that a reliable pressing force can be applied even when the axes of the receiving member 5 and the pressing member 7 are not aligned. A pressing portion 7 a having a hemispherical convex surface is formed on the member 7 side, and the pressing portion 7 a of the pressing member 7 is fitted to the receiving portion 5 a of the receiving member 5. The pressing member 7 may be formed by integrally forming the pressing portion 7a and the nut portion 9 having a hemispherical convex surface, or may be formed by separately forming the pressing portion 7a and the nut portion 9. After being assembled in this way, the oil cap 12 filled with grease G is screwed into the screw portion 5b formed on the outer peripheral surface of the receiving member 5, so that outside air does not enter the oil cap 12 and the To avoid seeing rust.

In addition, 2 is a screw formed on the lock bolt 1, 8 is a through hole of the pressing member 7, 12 a is a screw formed on the inner peripheral surface of the oil cap 12, and 13 is a top surface of the oil cap 12. The screw holes 14 are bolts to be screwed into the screw holes 13, and the arrow A indicates the direction of rotation when tightening with the nut 9 if the lock bolt 1 is a self-drilling bolt having a left-hand thread. The rotation directions when screwing the cap 12 are shown.

[0004]

[Problems to be solved by the invention]

 In the above-described structure in which the pressing portion 7a forming the hemispherical convex surface of the pressing member 7 is fitted into the receiving portion 5a forming the hemispherical concave surface of the receiving member 5, the contact area becomes large, and the frictional resistance is large. When both members were made of an as-cast iron casting, the pressing member 7 could not be moved smoothly.

[0005] Further, when dust or the like adheres to the screw portion during the assembling work outdoors and the oil cap 12 has to be forcibly turned in the direction of arrow B, the receiving member 5 is also attached. At that time, the pressing part 7a of the pressing member 7 turned in the same direction, and the one tightly fastened with the nut 9 became loose.

[0006]

[Means for Solving the Problems]

 For this reason, the invention of claim 1 provides a lock bolt that is fixed in the ground with its upper end protruding above the ground, a plate and a receiving member that are sequentially inserted into the externally projecting portions of the lock bolt. Rust prevention of a lock bolt comprising a pressing member screwed to the lock bolt to press from above, and an oil cap screwed to the outer peripheral surface of the receiving member and filled with grease. In the apparatus, the receiving member is made of an aluminum alloy having an inverted conical receiving portion formed on an upper surface thereof and a rubber packing receiving groove formed on a bottom surface, and the pressing member has a pressing portion having a hemispherical convex surface. The nut and the nut portion are made of an iron casting, and a non-slip rubber packing is provided in the rubber packing receiving groove so as to slightly protrude from the bottom surface of the receiving member.

In the invention of claim 2, the receiving member and the rubber packing for preventing slippage are the same as those described above, but the pressing member includes a pressing portion made of aluminum alloy having a hemispherical convex surface, This is different from the above in that it is constituted by a separate nut.

In any case, the lock bolt may be a right-handed screw bolt or a left-handed self-drilling bolt.

[0009]

[Embodiment of the invention]

 FIG. 1 shows an embodiment of a rust prevention device for a lock bolt according to the present invention. The difference from the conventional example of FIG. 3 will be described. One difference is that the receiving surface 5a of the receiving member 5 made of aluminum alloy is shown in a half sectional view of FIG. As described above, the inverted conical shape is adopted. Since the pressing portion 7a, which is a hemispherical convex surface of the pressing member 7, comes into line contact with the receiving surface 5a of the receiving member 5 having the inverted conical shape, the receiving member 5 and the pressing member 7 are smoothly connected. Can exhibit movement.

The second difference is that a rubber packing accommodating groove 10 concentric with the central through hole 6 is formed on the bottom surface, and a rubber packing 11 for preventing slippage is fitted. . When the rubber packing 11 is attached so as to slightly protrude from the bottom surface of the receiving member 5 in the attached state, the adhesion between the receiving member 5 and the plate 3 is improved, and slipping does not occur.

A third difference is that the receiving member 5 is made of an aluminum alloy as described above, while the pressing member is made of an iron casting in which a pressing portion having a hemispherical convex surface and a nut portion are integrally formed. In other words, the pressing part having a hemispherical convex surface is made of aluminum alloy, and the nut is made of normal iron.

In the example shown in FIG. 1, an air vent hole 15 is formed at the top of the oil cap 12 in addition to the grease injection hole 13, and bolts 14 and 16 are attached to the holes 13 and 15. Therefore, even if the oil cap 12 is attached to the receiving member 5 while being empty, the bolts 14 and 16 of the grease injection hole 13 and the air vent hole 15 at the top of the oil cap 12 are removed, and the grease gun is used. By filling the oil cap 12 with the grease G, the internal air is pushed out from the air vent hole 15, so that it is possible to fill the grease G to fill the entire internal space of the oil cap 12 without an extremely high filling pressure. it can.

[0013]

[Effect of the invention]

 According to the invention of claim 1, the receiving member is made of an aluminum alloy having excellent corrosion resistance, and the receiving surface formed on the receiving member is an inverted conical tapered surface. Even if the pressing member having a hemispherical convex surface that comes into contact is an as-cast iron casting with a rough surface, the contact between the two is a linear contact with low frictional resistance, so smooth movement is possible. Therefore, when the oil cap is screwed in, even if the receiving member rotates together and the pressing member does not rotate, the self-drilling bolt with the counterclockwise screw once firmly tightens The pressed state can be maintained.

In addition, since the anti-slip rubber packing is provided on the bottom surface of the receiving member, the anti-slip rubber packing presses against the plate after assembly and exhibits strong frictional resistance. At this time, since the receiving member is prevented from being rotated together, the inconvenience such as the loosening of the screw due to the co-rotation, in combination with the contact between the inverted conical tapered surface and the hemispherical convex surface, is prevented. It can be surely eliminated. In addition to this, an effect of preventing outside air from entering from the contact point with the plate can also be expected.

According to the invention of claim 2, the pressing member has a pressing portion having a hemispherical convex surface made of an aluminum alloy having excellent corrosion resistance, and the nut portion is formed separately from the pressing portion. The portion can be provided at a lower cost, for example, by using a commercially available product.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rust prevention device for a lock bolt according to the present invention.

FIG. 2A is a half sectional view of a screw ring, FIG. 2B is a bottom view thereof,

FIG. 3 is a sectional view showing a conventional example.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 lock bolt 2 screw 3 plate 4 through hole 5 receiving member 6 through hole 7 pressing member 8 through hole 9 nut 10 rubber packing accommodation groove 11 rubber packing 12 oil cap 13 grease injection hole 14 bolt 15 air vent hole 16 bolt

Claims (3)

[Utility model registration claims] 1. A lock bolt (1) fixed to the ground with its upper end protruding above the ground, a plate (3) fitted in order to an externally projecting portion of the lock bolt (1), and A receiving member (5), a pressing member (7) screwed to a lock bolt to press from above,
Further, in a rust prevention device for a lock bolt provided with an oil cap (12) screwed to the outer peripheral surface of the receiving member (5) and filled with grease, the receiving member (5) is inverted on its upper surface. It is made of an aluminum alloy having a conical receiving portion (5a) and a rubber packing receiving groove (10) on the bottom surface, and the pressing member (7) is provided with a pressing portion (7a) having a hemispherical convex surface. The nut part (9) is made of an iron casting and is integrally formed. In the rubber packing accommodating groove (10), a non-slip rubber packing (11) is formed so as to slightly project from the bottom surface of the receiving member (5). A rust prevention device for a lock bolt, characterized in that: 2. A lock bolt (1) fixed to the ground with its upper end protruding above the ground, a plate (3) fitted in order to an externally projecting portion of the lock bolt (1), and A receiving member (5), a pressing member (7) screwed to a lock bolt to press from above,
Further, in a rust prevention device for a lock bolt provided with an oil cap (12) screwed to the outer peripheral surface of the receiving member (5) and filled with grease, the receiving member (5) is inverted on its upper surface. A conical receiving portion (5a) is formed, and a rubber packing receiving groove (10) is formed on the bottom surface of an aluminum alloy. The pressing member (7) is a pressing portion made of an aluminum alloy having a hemispherical convex surface. (7a) and a nut (9) formed separately therefrom, and the rubber packing receiving groove (10) has a non-slip so as to slightly protrude from the bottom surface of the receiving member (5). A rust prevention device for a lock bolt, wherein a rubber packing (11) is provided. 3. The lock bolt (1) is a right-hand screw bolt or a left-hand screw self-drilling bolt.
Or a rust prevention device for a lock bolt according to claim 2.