JPH0810008B2 - Bolt hole concealing cap - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bolt hole concealing cap.

[0002]

2. Description of the Related Art For example, after a structural member is lifted and installed at a predetermined position, a lifting eyebolt is removed from the structural member. After removing the eyebolts, the bolt holes are generally left open as they are.

However, depending on the location of the structural member, rainwater may enter the lower surface of the structural member from the open bolt holes, causing rust and corrosion, which may cause deterioration of the structure and equipment. It is necessary to hide the bolt holes by.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a bolt hole concealing cap which can be smoothly and accurately mounted in a bolt hole by a simple operation and can reliably prevent rainwater from entering through the bolt hole. is there.

[0005]

The bolt hole concealing cap of the present invention is made of plastic, and a cylindrical portion 2 is provided on the lower surface 1a of the head 1, and the front and rear side surfaces of the cylindrical portion 2 are flat parallel to the diameter. The cylindrical portion 2 is divided into two arcuate wall portions 2a and 2b by the axial vertical groove portion 3 formed on the surfaces 2c and 2d and formed in the central portion of the flat surfaces 2c and 2d, and the tip reduced diameter portions 4a and 4 are formed.
b is left on the outer peripheral surface of each of the arcuate wall portions 2a and 2b, and the screw thread portion 5 is
a and 5b are provided, a rotation operation portion 6 is provided on the upper surface 1b of the head 1, and an annular projection 7 is provided on the lower surface 1a of the head 1 outside the cylindrical portion 2.

[0006]

In order to mount the cap on the bolt hole 9 of the structural member 8 or the like, the reduced-diameter portions 4a and 4b of the arc wall portions 2a and 2b are inserted as guide means into the inlet portion on the upper surface side of the bolt hole 9 to form an arc. The abdominal surfaces of the screw thread portions 5a and 5b of the wall portions 2a and 2b are butted against the abdominal surfaces of the screw thread portions 10 of the bolt holes 9. When the head 1 is pushed down in this state, it is pushed by the screw thread portion 10 of the bolt hole 9 and the arcuate wall portions 2a and 2b are elastically deformed inward. As a result, the cylindrical portion 2 is fitted into the bolt hole 9.

At this time, the arcuate wall portions 2a and 2b are formed by dividing the cylindrical portion 2 into two by the vertical groove portion 3 at the center of the front and rear flat surfaces 2c and 2d, and the arcuate wall portions 2a and 2b. Since the width of the circular arc wall is reduced, the arcuate wall portions 2a and 2b are flexed without excessive resistance, and the pushing operation of the cylindrical portion 2 into the bolt hole 9 is smoothly performed.

After pushing almost the entire length of the semi-cylindrical parts 2a and 2b into the bolt holes 9, a rotary operation tool is inserted into the rotary operation part 6 of the head 1 and the cap is rotated several times in the screwing direction. The screw thread portions 5a and 5b of the cylindrical portions 2a and 2b are correctly screwed with the screw thread portion 10 of the bolt hole 9 in the entire length. Then, when the cap is strongly screwed in last, the annular projection 7 of 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 holes 8.

[0009]

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

The annular projections 7 on the lower surface 1a of the head 1 are provided double inside and outside to enhance the water blocking effect. When the cap is molded from a soft plastic material, the annular projection 7 is partially deformed by the final screwing operation and comes into close contact with the structural member 8, so that the water blocking effect is further improved.

[0011]

As described above, in the bolt hole concealing cap of the present invention, the front and rear both side surfaces of the cylindrical portion 2 of the lower surface 1a of the head 1 are formed into flat surfaces 2c and 2d, and the flat surfaces 2c and 2d are formed. The vertical groove portion 3 in the center portion allows the cylindrical portion 2 to be connected to the two arc wall portions 2.
a, 2b, and screw threads 5a, 5b are provided on the arcuate wall portions 2a, 2b, leaving the tip diameter-reduced portions 4a, 4b, and the annular projection 7 is provided on the lower surface 1a of the head 1 outside the cylindrical portion 2. The cap is smoothly and accurately inserted into the bolt hole 9 by a simple operation in which the circular arc wall portions 2a and 2b are pushed into the bolt hole 9 and then rotated several times by the rotary operation portion 6 of the head 1. Since the ring-shaped protrusion 7 can be mounted and the object is in close contact with the object, a high water-stopping effect can be obtained.

[Brief description of drawings]

FIG. 1 is a front view of a bolt hole concealing cap 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.

5 is a cross-sectional view taken along the line AA of FIG.

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

[Explanation of symbols]

 1 Cap head 1a Head bottom part 1b Head top part 2a Arc wall part 2b Arc wall part 2c Flat surface 2d Flat surface 3 Vertical groove part 4a Tip reduced diameter portion 4b Tip reduced diameter portion 5a Screw thread portion 5b Screw Mountain part 6 Rotation operation part 7 Annular protrusion part 8 Structural member 9 Bolt hole 10 Screw thread part

Claims (1)

[Claims] 1. A cylindrical portion 2 is provided on a lower surface 1a of a head portion 1, and both front and rear side surface portions of the cylindrical portion 2 are flat surfaces 2c, 2 parallel to a diameter.
The cylindrical portion 2 is formed into two circular arc wall portions 2 by an axial vertical groove portion 3 formed in the center of the flat surfaces 2c and 2d.
It is divided into a and 2b, and the threaded portions 5a and 5b are provided on the outer peripheral surfaces of the respective arcuate wall portions 2a and 2b, leaving the tip reduced diameter portions 4a and 4b, and the rotation operation portion 6 is provided on the upper surface 1b of the head 1. A cap for concealing a bolt hole made of plastic, in which an annular protrusion 7 is provided on the lower surface 1a of the head 1 on the outside of the cylindrical portion 2.