JP3055917U - Bolt hole concealment cap - Google Patents

Abstract

(57) [Problem] To provide a bolt hole concealing cap that can be smoothly and accurately attached to a bolt hole by a simple operation and that can reliably prevent rainwater from entering through the bolt hole. SOLUTION: A cylindrical portion 2 is provided on a lower surface 1a of a head portion 1 made of plastic, and a cylindrical portion 2 is formed into an arc-shaped wall portion 2a, 2b, 2c, 2d by a longitudinal groove 3 in an axial direction except a leading end guide portion 4. Divided, screw thread portions 5a, 5c are provided on the outer peripheral surface of a pair of opposed arcuate wall portions 2a, 2c, and the arcuate wall portions 2a, 2c
Of the head 1 is cut off by a circumferential transverse groove 6 intersecting with the longitudinal grooves 3, 3. The protrusion 8 is provided outside the cylindrical portion 2.

Description

[Detailed description of the invention]

[0001]

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

[0002]

[Prior art]

 For example, after the structural member is lifted to a predetermined position and installed, the 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 invention is to provide a bolt hole concealing cap which can be smoothly and accurately attached to a bolt hole by a simple operation and which can surely prevent rainwater from entering through the bolt hole. It is.

[0005]

Means for Solving the Problems The cap for concealing bolt holes of the present invention is made of plastic, and is provided with a cylindrical portion 2 on the lower surface 1a of the head portion 1, and the cylindrical portion 2 is pivoted with the tip guiding portion 4 left. Are divided into four arc-shaped walls 2a, 2b, 2c, and 2d by the vertical grooves 3, and threaded portions 5a, 5c are provided on the outer peripheral surfaces of a pair of opposed arc-shaped walls 2a, 2c. The roots of the heads 2a and 2c on the side of the head 1 are cut off by a circumferential lateral groove 6 intersecting the longitudinal grooves 3 and 3, and a rotation operation unit 7 is provided on the upper surface 1b of the head 1 and the lower surface of the head 1 An annular projection 8 is provided on the outer side of the cylindrical portion 2 in 1a.

In order to attach a cap to the bolt hole 10 of the structural member 9 or the like, the leading end guide portion 4 of the cylindrical portion 2 is inserted into the inlet portion on the upper surface side of the bolt hole 10, and the screw of the arc wall portions 2a, 2c is inserted. The abdominal surfaces of the child ridges 5a and 5c abut against the abdominal surfaces of the screw ridges 11 of the bolt holes 10. When the head 1 is pressed down in this state, the arcuate wall portions 2a and 2c are elastically deformed inward by being pushed by the thread ridges 11 of the bolt holes 10. Thereby, the cylindrical portion 2 is fitted into the bolt hole 10.

At this time, the remaining pair of arc-shaped wall portions 2b and 2d of the cylindrical portion 2 have a slightly smaller outer peripheral radius than the crest radius of the screw crest portion 11, so that the arc-shaped wall portions 2b and 2d are adjacent to each other. Except for the portion that is deformed by being pulled by the arc-shaped wall portions 2a and 2c, it is not elastically deformed by the screw thread portion 11 of the bolt hole 10. Since the arc-shaped groove walls 2a and 2c that are elastically deformed have their roots separated from the cylindrical body by the lateral grooves 6, the inward bending is easily performed, and the cylindrical holes 2a and 2b are inserted into the bolt holes 10. Make the pushing work smoothly.

After substantially the entire length of the cylindrical portion 2 is pushed into the bolt hole 10, a rotary operation tool is inserted into the rotary operation portion 7 of the head 1, and the cap is turned several times in the screwing direction to obtain an arc wall portion 2 a , 2c are screwed correctly with the screw thread 11 of the bolt hole 10 over the entire length. Finally, when the cap is screwed firmly, the annular projection 8 on the lower surface 1 a of the head 1 is brought into close contact with the structural member 9. This prevents rainwater from entering the bolt hole 10.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION In the illustrated embodiment, a head 1 is formed of a circular disk concentric with a cylindrical portion 2, and a rotation operation portion 7 on an upper surface 1b is formed of a minus driver groove. The rotary operation section 7 may be formed of a plus-shaped driver groove, a hexagonal recess or protrusion for a box driver, or the like.

The annular projection 8 on the lower surface 1 a 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 8 is partially deformed by the last screwing operation and closely adheres to the structural member 9, so that the water stopping effect is increased.

[0011]

As described above, the bolt hole concealing cap of the present invention has the cylindrical portion 2 of the lower surface 1a of the head 1 and the arcuate wall portions 2a, 2b, 2c, 2d is divided into four parts, and thread ridges 5a, 5c are provided on the outer peripheral surface of a pair of opposed arcuate wall portions 2a, 2c. An annular projection 8 is provided on the lower surface 1a of the head 1 outside the cylindrical portion 2, and after the cylindrical portion 2 is pushed into the bolt hole 10, the rotary operation portion 7 of the head 1 is used several times. By a simple operation of turning, the attachment to the bolt hole 10 can be carried out smoothly and accurately, and the annular projection 8 is brought into close contact with the object to obtain a necessary and sufficient water stopping effect.

[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 BB of FIG. 1;

FIG. 6 is a sectional view taken along line AA of FIG. 1;

[Description of Signs] 1 Head of cap 1a Lower surface of head 1b Upper surface of head 2a Arc wall 2c Arc wall 2d Arc wall 2e Arc wall 3 Vertical groove 4a Tip diameter reduction part 4b Tip diameter reduction Part 5a Thread part 5b Thread part 6 Lateral groove part 7 Rotation operation part 8 Annular projection part 9 Structural member 10 Bolt hole 11 Thread part

Claims (1)

[Utility model registration claims] 1. A cylindrical portion 2 is provided on a lower surface 1a of a head 1, and the cylindrical portion 2 is divided into four arc-shaped wall portions 2a, 2b, 2c, 2d by an axial longitudinal groove portion 3 except for a leading end guide portion 4. The screw ridge 5 is formed on the outer peripheral surface of the pair of arcuate walls 2a and 2c facing each other.
a, 5c are provided, and the roots of the arc-shaped wall portions 2a, 2c on the head 1 side are separated by a circumferential horizontal groove 6 intersecting with the vertical grooves 3, 3, and the upper surface 1b of the head 1 is rotated. A plastic bolt hole concealing cap having a portion 7 and an annular projection 8 provided on the lower surface 1a of the head 1 outside the cylindrical portion 2.