JP3021104U - Anti-rust cap for bolts and nuts - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention is a bolt and a nut that securely clamps bolts and nuts by pressing and forcibly inserting them, does not worry about falling off, and prevents rusting. Provide a rustproof cap for the nut. [Structure] In a rust preventive cap filled with rust preventive grease, a cylindrical body 1 having a bottom and formed of synthetic resin having elasticity, and a cylindrical skirt portion connected to the body 1 and having one end opened It is configured such that a bolt holding rib 3 is formed on the inner peripheral surface of the body portion 1 on the entire length in the longitudinal direction, and a nut holding rib is formed on the inner peripheral surface of the skirt portion 2 on the entire length in the longitudinal direction.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rust preventive cap for bolts and nuts used for connecting pipes in gas pipes buried underground.

Conventionally, in a gas pipe buried underground, a dresser coupling installed in a manhole is fastened with a plurality of bolts and nuts via a pressing plate. Moreover, in order to prevent loosening against vibration, etc., it is strongly tightened with a double nut that is a superposition of two nuts. Then, these nuts are generally retightened once every 2-3 years in order to prevent gas leakage. However, rainwater and groundwater flow into the manhole from the outside, and these bolts and nuts are located below the water surface. Moreover, since these bolts and nuts are made of steel and are only galvanized, rust often occurs when the plating is peeled off, which makes retightening difficult. Occurred a lot.

A conventional cap for protecting bolts and nuts from rust is disclosed in Japanese Utility Model Laid-Open No. 4-44513. This conventional one is provided with a screw groove hole that fits into the screw groove of the bolt, and these are screwed into the screw of the bolt and attached to prevent the bolt from falling off. Also, the one disclosed in Japanese Utility Model Laid-Open No. 55-3020 is provided with an inner ring portion (rib) that matches the shape of the curved surface of the lower surface of the nut and an annular lip provided around the inner ring portion with a recessed portion. To prevent the bolt from falling off.

[0004]

[Problems to be solved by the device]

 However, in the prior art in which the screw groove is provided, the effect of preventing the drop is sure, but the cap is attached to the bolt multiple times by rotating the cap several times and screwing into the screw groove of the bolt. Therefore, the workability is poor and the operation is troublesome. In addition, in the case where the inner ring part (rib) that matches the shape of the outer circumference of the lower surface of the nut and the lip are provided, mounting is often uncertain, and even part of the outer surface of the nut lower surface is dislocated. In the state, there was a risk of falling off with a weak force.

The present invention solves the above problems, and is extremely easy to attach and detach, has good workability, and securely holds the bolt and nut, and prevents the bolt and nut from falling off. Intended to provide a rust cap.

[0006]

[Means for Solving the Problems]

 The present invention relates to a rust preventive cap filled with a rust preventive grease, which is made of a synthetic resin having elasticity and has a bottomed cylindrical body portion, and a cylindrical shape connected to the body portion and having one end opened. A skirt portion, and a bolt holding rib is formed on the inner peripheral surface of the body portion and the entire length in the longitudinal direction, and a nut holding rib is formed on the inner peripheral surface of the skirt portion and the entire length in the longitudinal direction. Is characterized by.

[0007]

[Action]

 After filling the rust preventive cap with rust preventive grease, forcibly insert the bolt and nut into the rust preventive cap, clamp the bolt by the elasticity of the bolt clamping rib and the body, and by the elasticity of the nut clamping rib and the skirt. Hold the nut. These clamping forces ensure a secure fit.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a partial cross-sectional front view showing an embodiment of a bolt and nut rustproof cap of the present invention, FIG. 2 is a side view of FIG. 1, FIG. 3 is a cross-sectional front view showing a use state, and FIG. Is a vertical sectional side view of the skirt portion showing a use state, FIG. 5 is a vertical sectional side view of the body portion showing a use state, and FIG. 6 is a vertical sectional side view for explaining a shift in the direction of the double nut.

The rust preventive cap 10 for bolts and nuts of the present embodiment is formed of a synthetic resin having elasticity and is composed of a body portion 1 and a skirt portion 2. The body portion 1 has an inner peripheral surface and a longitudinal direction. Is formed with four bolt holding ribs 3 at an angle of 90 °, and four nut holding ribs 4 are provided at the inner peripheral surface of the skirt portion 2 at an angle of 90 ° in the longitudinal direction. This is a structure formed at a position alternating with that of No. 3.

In order to attach the rust preventive cap filled with rust preventive grease to the bolt A and the nuts B and B ′, it is inserted into the bolt A from the opening 5a of the opening 5 formed continuously from the skirt 2. Go. Eventually, the end portion A1 of the bolt A contacts the taper portion 6 of the bolt holding rib 3. From this state, press the rust preventive cap 10 forcibly and insert the bolt A into the gap between the four bolt pinching ribs 3, and the side surface of the bolt pinching rib 3 pinches the bolt A, and the elasticity of the body portion 1 is also increased. Securely pinch together. Before and after this, the side surfaces of the nut holding rib 4 hold the nuts B and B ', and together with the skirt portion 2 securely hold the nuts B and B'. Then, the opening 5 is inserted until it comes into contact with the holding plate 9 to prevent the rust preventive grease 8 from flowing out.

When the rust preventive cap 10 is inserted into the bolts A, nuts B and B ′, the body portion 1 and the skirt portion 2 are pushed apart and deformed at the positions where the bolt holding ribs 3 and the nut holding ribs 4 are formed. There is a case. In this case, by forming the bolt holding ribs 3 and the nut holding ribs 4 at mutually different positions, the deformed portions do not shift and do not affect each other, and the holding force is not reduced.

As shown in FIG. 6, the double nuts B and B ′ do not always have the sides 20 aligned with each other and often cause a deviation. 21 is reached (see FIG. 6B). In this way, even if a displacement occurs, the nut clamping ribs 4 formed at intervals of 90 ° can stably clamp the nuts B and B ′ simply by shifting the mounting position, and the skirt part Since it is located almost in the middle, the rust preventive grease 8 covers the nuts B and B'whole and adheres tightly, and rust can be surely prevented. Further, the clamping force can be increased by increasing the number of bolt clamping ribs 3. It can be applied to bolts and nuts of different sizes to some extent.

[0014]

[Effect of device]

 As described above, according to the present invention, a body having a bottomed tubular body formed from a synthetic resin having elasticity and a skirt portion connected to the body and having one end opened, Since the required number of bolt clamping ribs and nut clamping ribs are formed on the inner peripheral surface of the skirt, the inner peripheral surface of the skirt, and the entire length in the longitudinal direction, it is easy to press the bolts and nuts and forcefully insert them. It can be installed quickly by work, and it is securely clamped so that it does not fall off. In addition, the bolt and nut can be positioned almost in the center of the rust preventive cap, and the rust for covering the whole with the rust preventive grease can be prevented.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional front view showing an embodiment of a bolt and nut rustproof cap of the present invention.

FIG. 2 is a side view of FIG.

FIG. 3 is a cross-sectional front view showing a usage state.

FIG. 4 is a vertical sectional side view of a skirt portion showing a usage state.

FIG. 5 is a vertical cross-sectional side view of a body portion showing a usage state.

FIG. 6 is a vertical cross-sectional side view for explaining the deviation in the direction of the double nut.

[Explanation of symbols]

 1 Body Part 2 Skirt Part 3 Bolt Holding Rib 4 Nut Holding Rib 5 Opening 5a Opening Port 6 Bolt Holding Rib Tapered Part 7 Nut Holding Rib Tapered Part 8 Anticorrosion Grease 9 Press Plate 10 Antirust Cap A Bolts B, B '' Nut

Claims (3)

[Scope of utility model registration request] 1. A rust preventive cap filled with a rust preventive grease, which is formed of an elastic synthetic resin and has a cylindrical body with a bottom, and a cylindrical body which is connected to the body and has one end opened. A skirt portion, and a bolt holding rib is formed on the inner peripheral surface of the body portion and the entire length in the longitudinal direction, and a nut holding rib is formed on the inner peripheral surface of the skirt portion and the entire length in the longitudinal direction. Anti-corrosion cap for bolts and nuts. 2. The nut holding ribs are 4 at an angle of 90 °.
The rust preventive cap for a bolt and a nut according to claim 1, wherein a plurality of ribs for holding the bolt are formed at a predetermined angle while being formed. 3. The nut holding ribs are 4 at an angle of 90 °.
The rust preventive cap for a bolt and a nut according to claim 1, wherein four bolt holding ribs are formed at a position alternating with the nut holding rib at an angle of 90 °.