JP3055940U - Bolt hole concealment cap - Google Patents

Abstract

(57) [Problem] To provide a cap for concealing a bolt hole which is attached to the bolt hole by a simple operation and which can appropriately prevent rainwater from entering through the bolt hole. SOLUTION: A semi-cylindrical portion 2 divided into two by a diametrically dividing groove 3 on a lower surface 1a of a plastic head 1.
a, 2b are provided, and thread ridges 5a, 5b are provided on the outer peripheral surface of each semi-cylindrical portion 2a, 2b except for the reduced diameter portions 4a, 4b.
The rotation operation unit 6 is provided on the upper surface 1b of the head 1, and the annular projection 7 is provided on the lower surface 1a of the head 1 outside the semi-cylindrical parts 2a, 2b.

Description

[Detailed description of the invention]

[0001]

TECHNICAL FIELD The present invention relates to a cap for concealing a bolt hole.

[0002]

2. Description of the Related Art For example, after a structural member is lifted to a predetermined position and installed, a lifting eyebolt is removed from the structural member. The bolt hole after removing the eyebolt is generally left open.

However, depending on the location of the structural member, rainwater enters the lower surface of the structural member through the opened bolt holes and causes rust and corrosion, which causes deterioration of the structure and equipment. It is necessary to cover the bolt hole with a cap member.

[0004]

[Problem to be Solved by the Invention] An object of the present invention is to provide a bolt hole concealing cap which can be attached to a bolt hole by a simple operation and can accurately prevent rainwater from entering through the bolt hole.

[0005]

Means for Solving the Problems The cap for concealing bolt holes of the present invention is made of plastic, and provided on the lower surface 1a of the head 1 with semi-cylindrical portions 2a and 2b which are divided into two by a diametrically dividing groove 3. The threaded portions 5a and 5b are provided on the outer peripheral surface of each of the semi-cylindrical portions 2a and 2b except for the reduced diameter portions 4a and 4b, and the rotary operation portion 6 is provided on the upper surface 1b of the head 1. An annular projection 7 is provided on the lower surface 1a of the lower side of the semi-cylindrical portions 2a and 2b.

In order to attach a cap to the bolt hole 9 of the structural member 8 or the like, the leading end reduced diameter portions 4a and 4b of the semi-cylindrical portions 2a and 2b are inserted into the upper surface side entrance of the bolt hole 9 as guiding means, and The abdominal surfaces of the thread portions 5a and 5b of the cylindrical portions 2a and 2b abut against the abdominal surfaces of the thread portions 10 of the bolt holes 9. When the head 1 is pressed down in this state, the semi-cylindrical portions 2a and 2b are elastically deformed inward by being pushed by the screw thread portions 10 of the bolt holes 9. As a result, the semi-cylindrical portions 2a and 2b are fitted into the bolt holes 9.

After the substantially full lengths of the semi-cylindrical portions 2 a and 2 b are fitted into the bolt holes 9, a rotary operation tool is inserted into the rotary operation portion 6 of the head 1, and the cap is turned several times in the screwing direction. The thread portions 5a and 5b of the semi-cylindrical portions 2a and 2b are properly screwed with the thread portions 10 of the bolt holes 9 over the entire length. Finally, when the cap is screwed firmly, the annular projection 7 on the lower surface 1a of the head 1 is brought into close contact with the structural member 8. This prevents rainwater from entering the bolt hole 8.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, the head 1 is constituted by a circular disk concentric with the semi-cylindrical parts 2a and 2b, and the rotary operation part 6 on the upper surface 1b is constituted by a minus driver groove. . The rotary operation section 6 may be formed of a plus-type driver groove, a hexagonal box driver concave or convex section, or the like.

The annular projection 7 on the lower surface 1a of the head 1 is provided in two layers, inside and outside, to enhance the water stopping action. When the cap is molded from a soft plastic material, the annular projection 7 is partially deformed by the last screwing operation and closely adheres to the structural member 8, so that the water stopping effect is further improved.

[0010]

As described above, the cap for concealing a bolt hole according to the present invention is provided with the semi-cylindrical portions 2a and 2b on the lower surface 1a of the head 1 and leaving the semi-cylindrical portions with the reduced diameter portions 4a and 4b. Threaded portions 5a and 5b are provided on the outer peripheral surfaces of 2a and 2b, and an annular projection 7 is provided on the lower surface 1a of the head 1 outside the semi-cylindrical portions 2a and 2b. The simple operation of pushing in the cylinders 2a and 2b and then turning it several times with the rotary operation unit 6 of the head 1 allows the bolt holes 9 to be concealed with high work efficiency, and the annular projection 7 is targeted. A high water stopping effect can be obtained by closely adhering to an object.

[Brief description of the drawings]

FIG. 1 is a front view of a cap for concealing a bolt hole according to an embodiment of the present invention.

FIG. 2 is a plan view of the cap.

FIG. 3 is a left side view of the cap.

FIG. 4 is a bottom view of the cap.

FIG. 5 is a sectional view taken along line AA of FIG. 1;

FIG. 6 is a sectional view taken along line BB of FIG. 3;

[Explanation of symbols]

 Reference Signs List 1 Cap head 1a Head lower surface 1b Head upper surface 2a Semi-cylindrical portion 2b Semi-cylindrical portion 3 Split groove 4a Tip reduced diameter portion 4b Tip reduced diameter portion 5a Threaded portion 5b Threaded portion 6 Rotating operation portion Reference Signs List 7 annular protrusion 8 structural member 9 bolt hole 10 screw thread

Claims (1)

[Utility model registration claims] 1. A diametrically dividing groove 3 on a lower surface 1a of a head 1.
The semi-cylindrical parts 2a and 2b are divided into two parts, and the thread ridges 5a and 5b are provided on the outer peripheral surfaces of the semi-cylindrical parts 2a and 2b except for the reduced diameter parts 4a and 4b. , A rotary operation portion 6 is provided, and an annular projection 7 is provided on a lower surface portion 1 a of the head 1.
Is provided outside the semi-cylindrical portions 2a and 2b.