JP2001165138A - Rust preventing device for lock bolt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem of causing a fastened state to get loose in the case of a left-hand threaded nut due to the corotation of a threaded ring when thread-fastening an oil cap to the threaded ring in a conventional rust preventing device for a lock bolt constituted by insert-fitting a plate, the threaded ring and a spherical washer to the lock bolt to fix and hold the surface of the natural ground or the like, pressing them with a nut for the lock bolt and thread- fastening the oil cap to the threaded ring. SOLUTION: A non-slip rubber packing 11 is fitted to a rubber packing storage groove 10 formed at the bottom face of the threaded ring 5 to prevent the corotation of the threaded ring 5 with strong frictional resistance exhibited by the non-slip rubber packing 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rust prevention device for a lock bolt for fixing and holding a surface of a ground or the like.

[0002]

2. Description of the Related Art Conventionally, as a rust preventive device for a lock bolt for fixing and holding a surface of a ground or the like, as shown in FIG. A normal lock bolt (hereinafter, referred to as a lock bolt, denoted by reference numeral 1) is inserted into a hole B formed in the ground A, grout material C is injected and fixed to the ground, and then the lock bolt 1 is fixed. After the through holes 4 of the plate 3, the through holes 6 of the threaded ring 5, and the through holes 8 of the spherical washer 7 are sequentially inserted into the outside projecting portions of the The bolt 9 is fastened with a nut 9 screwed to the left or right screw 2 formed on the surface. In this case, even if the axial direction of the lock bolts 1 and the surface of the ground A are not orthogonal to each other, the spherical convex surface 7a of the spherical washer 7 and the spherical concave surface 5a of the threaded ring 5 cooperate with each other so that the pressure generated by the nut 9 is reduced. It is possible to carry out tightening without hindrance. Next, an appropriate amount of grease G is filled in the oil cap 12 in advance, and the oil cap 12 is screwed to a screw 5b formed on the outer peripheral surface of the threaded ring 5, and the grease G in the oil cap 12 is used to lock the bolt 1 or the like. It was designed to prevent rust even after long-term use without air contact.

[0003]

Since the work for assembling the rust preventive device for a lock bolt described above is performed outdoors, it is necessary to prevent the dust from adhering to the screw portion and forcibly turning the oil cap 12. In some cases, it could not be attached, and if it was forcibly turned, even the threaded ring 5 could turn together. If the lock bolt 1 is a self-drilling bolt that is a left-hand thread, it is tightened when it is turned in the direction of arrow A. When the threaded ring 5 rotates clockwise together with the oil cap 12 in the direction of arrow B, the tightening by the nut 9 is loosened. As a result, the tightening of each press contact part was reduced, and accordingly, the rust prevention effect was also reduced. If the lock bolt 1 is a normal right-hand thread, the nut 9 can be rotated with the oil cap 12.
Is not loosened, but the contact between the metal of the plate 3 and the threaded ring 5 is not always good.
And other causes that cause rust. Further, even if the oil cap 12 filled with an appropriate amount of grease G is put on the air, the air sealed in the oil cap 12 comes into contact with the lock bolt 1 or the like as shown in FIG. Even if the bolt 14 was removed and injection was attempted with a grease gun, the filling pressure was high and injection of grease was almost impossible.

An object of the present invention is to further improve the rust prevention effect described above.

[0005]

Means for Solving the Problems As means for solving the above-mentioned problems, the invention according to claim 1 of the present invention provides a lock bolt fixed with its upper end protruding above the ground, and a lock for the lock bolt. A plate which is inserted in order at the external protruding portion of the bolt, a threaded ring, a spherical washer, a nut for a lock bolt which presses these mutually abutting surfaces, and an oil cap screwed onto the threaded ring The threaded ring has a rubber packing receiving groove formed on the bottom face, and a rubber packing for preventing slippage is provided in the rubber packing receiving groove so as to slightly protrude from the bottom face of the threaded ring 4. is there.

According to a second aspect of the present invention, there is provided a lock bolt fixed with its upper end protruding above the ground, a plate sequentially fitted to an externally projecting portion of the lock bolt, and a threaded ring. And a spherical washer, a nut for a lock bolt that presses the contact surfaces thereof together, and an oil cap screwed onto the threaded ring, wherein the threaded ring has a rubber packing receiving groove formed on the bottom surface. A rubber packing for preventing slippage is provided in the rubber packing accommodating groove so as to slightly protrude from the bottom surface of the threaded ring, and a grease injection hole and an air vent hole are formed at the top of the oil cap, A bolt was attached to each hole.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a lock bolt rust prevention device according to the present invention will be described.
The screw 2 formed on the surface may be a self-drilling bolt that is a left-hand screw, or an ordinary lock bolt that is a right-hand screw.
In any case, the grout material C is injected into the hole B drilled in the ground A, and the lock bolt 1 is fixed with the upper end protruding above the ground. The through holes 4 of the plate 3 and the through holes 6 of the threaded ring 5
And the through hole 8 of the spherical washer 7 is fitted and pressed by a nut 9 screwed onto the lock bolt 1 from above, and the oil is attached to the male screw 5b formed on the outer peripheral surface of the threaded ring 5. A female screw 12a formed on the inner peripheral lower end surface of the cap 12 is screwed. The above description is almost the same as the conventional example.

The difference of the present invention from the conventional example is as follows. As shown in a half sectional view of FIG. 2A and a bottom view of FIG. A rubber packing accommodating groove 10 concentric with the central through hole 6 is formed, and a rubber packing 11 for slip prevention is mounted so as to slightly protrude from the bottom surface of the threaded ring 5 in the mounted state. I have.

In addition to the grease injection hole 13, an air vent hole 15 is formed at the top of the oil cap 12, and bolts 14, 16 are attached to the holes 13, 15.

Now, as shown in FIG. 1, when assembled according to the conventional example, the rubber packing 1 provided on the bottom surface of the threaded ring 5 is formed.
1 is pressed against the plate 3 to generate a strong frictional resistance with the plate 3. Therefore, even if dust or the like adheres to the screw and forcibly screw-in the oil cap 12 to move the oil-cap 12 together with the threaded ring 5, the rotation can be prevented by the above-described frictional resistance. In addition, since the rubber packing 11 is interposed between the threaded ring 5 and the plate 3, reliable adhesion can be obtained, and the possibility of intrusion of outside air from the portion can be reliably blocked.

The oil cap 12 is attached to the threaded ring 5 while being empty, and then the oil cap 1 is mounted.
Grease injection hole 13 and air vent hole 15 at the top of 2
When the grease G is filled into the oil cap 12 using a grease gun, the internal air is pushed out from the air vent hole 15 with the filling of the grease G. Instead, the grease G can be filled in the entire inner space of the oil cap 12. After filling, each hole 1 with bolts 14 and 16
Block 3,15.

[0012]

As is apparent from the above description, according to the first aspect of the present invention, the rubber packing for preventing slippage provided on the threaded ring exhibits a strong frictional resistance, so that the threaded ring has an oil cap. And the tightening force obtained by tightening the nut of the left screw will not be loosened by the above-mentioned turning,
An effective rust prevention effect can be maintained. In addition, since the threaded ring and the plate can be reliably adhered to each other by the rubber packing, the possibility of intrusion of outside air through the portion can be completely eliminated, and this point also maintains the rust prevention effect. It is an effective point for.

According to the second aspect of the present invention, an air vent hole other than the grease injection hole is formed at the top of the oil cap, so that the air inside the oil cap is released as the grease is filled. Since the oil is pushed out from the oil cap, the grease is filled to fill the inside of the oil cap and the residual air itself is eliminated, so that the rust prevention effect for a long time can be maintained.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a rust prevention device for a lock bolt of 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]

 1 Lock Bolt 2 Screw 3 Plate 4 Through Hole 5 Threaded Ring 6 Through Hole 7 Spherical Washer 8 Through Hole 9 Nut 10 Rubber Packing Storage Groove 11 Rubber Packing 12 Oil Cap 13 Grease Injection Hole 14 Bolt 15 Air Vent Hole 16 Bolt

Claims (2)

[Claims] 1. A lock bolt fixed with its upper end protruding above the ground, a plate which is sequentially inserted into an externally projecting portion of the lock bolt, a threaded ring, a spherical washer, and the like. A lock bolt nut for pressing the mutual contact surfaces against each other, and an oil cap screwed onto the threaded ring, wherein the threaded ring has a rubber packing receiving groove formed on the bottom surface, and the rubber packing receiving groove is formed in the rubber packing receiving groove. A rust prevention device for a lock bolt, wherein a non-slip rubber packing is provided so as to slightly protrude from the bottom surface of the threaded ring. 2. A lock bolt which is fixed with its upper end protruding above the ground, a plate which is sequentially fitted to an externally projecting portion of the lock bolt, a threaded ring, a spherical washer, and the like. A lock bolt nut for pressing the contact surfaces against each other, and an oil cap screwed to the threaded ring, wherein the threaded ring has a rubber packing receiving groove formed on a bottom surface, and the rubber packing receiving groove is formed in the rubber packing receiving groove. A rubber packing for anti-slip is provided so as to slightly protrude from the bottom of the threaded ring, a grease injection hole and an air release hole are drilled at the top of the oil cap, and bolts are attached to each hole. A rust prevention device for lock bolts, characterized by the following.