JP2002168224A - Structure of a pair of nut and washer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reliably tighten a mounting object for a structure by securing the spherical contact between a nut and a washer in all directions when the mounting object is slantly tightened by a bolt and a nut. SOLUTION: This structure of a pair of the nut and the washer wherein the bearing surface of the nut 5 for the washer 6 for screwing the bolt is made a convex surface 11, and the bearing surface of the washer 6 for the nut 5 is made a concave surface 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a nut-seat plate pair which is screwed to a bolt to fasten an object to be mounted.

[0002]

2. Description of the Related Art As shown in FIG. 1, when a mounting object 3 is to be assembled diagonally to a bolt 2 which stands vertically from a structure 1, a bolt tip is inserted into a mounting hole 4 of the mounting object 3. It is loosely inserted and fastened by a nut 5 screwed to the bolt 2 on the inlet side of the mounting hole 4 and a nut 5 screwed to the bolt 2 on the outlet side. The object 3 to be attached to the upstream bolt 2 by the double nut.
With a difference in the fastening heights of the two for inclined mounting.

[0003]

As shown in FIG. 1, when fastening with the nut 5, the seat plate 6 is interposed between the seat surface 7 of the nut 5 and the slope 8 of the object 3 to be mounted. However, the seat plate 6 loosely inserted into the bolt 2 is installed obliquely along the slope 8 (installed obliquely with respect to the bolt axis).
Since the nut 5 is screwed at right angles to the axis of the bolt 2, it is difficult to make a surface contact (parallel contact) between the seat surface 7 of the nut 5 with the seat plate 6 and the seat surface 9 of the seat plate 6 with the nut 5, As shown in the figure, the one-side contact phenomenon of contact at one point T on the upstream side cannot be prohibited. Therefore, there is a problem that the fastening is not sound and loosening occurs due to vibration or the like at an early stage.

[0004]

SUMMARY OF THE INVENTION The present invention fundamentally solves the above-mentioned problems and provides a structure of a nut / seat plate pair capable of soundly mounting a mounting object in an inclined manner.

The structure of this nut / seat plate pair is such that the nut screwing bolt has a convex spherical seat on the seat surface of the seat plate with respect to the seat plate, the concave seat surface of the seat plate on the nut has a concave curved spherical seat.
At the time of fastening the nut, a structure is adopted in which a slip occurs while maintaining annular contact between the convex curved spherical seat of the nut and the concave spherical seat of the seat plate to absorb the inclination of the seat plate. Accordingly, the annular contact between the convex curved spherical seat and the concave curved spherical seat at the time of the inclined mounting of the mounting object is ensured, and a sound fastening without loosening is achieved.

[0006] A tool engaging ring is integrally provided on the top surface of the nut opposite to the convex curved spherical seat, and a tool for inserting and engaging a tool into the tool engaging ring to rotate the nut. A plurality of mating grooves are provided in the circumferential direction.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 3, the nut 5 has a polygonal shape such as a hexagon, and has a bolt screw hole 10 at the center thereof. The seat surface of the nut 5 for screwing the bolt to the seat plate 6 is a convex curved spherical seat 11.

On the other hand, the flat seat plate 6 has a bolt insertion hole 12 at the center thereof, and the seat surface of the flat seat plate 6 for the nut 5 is a concave curved spherical seat 13.

As a preferred example, the convex curved spherical seat 11
And the concave curved spherical seat 13 are substantially half of a sphere, that is, a hemispherical spherical seat. In the nut 5, a substantially hemispherical bulge 14 is integrally and concentrically provided on the bottom surface, and the convex curved spherical seat 11 is formed on the surface of the hemispheric bulge 14. The bolt screw hole 10 penetrates through the center of the convex curved spherical seat 11, and the convex curved spherical seat 1 surrounds the bolt screw hole 10.
1 is formed concentrically.

On the other hand, in the seat plate 6, a hemispherical concave portion 15 is provided concentrically and annularly on the seating surface, and a concave curved spherical seat 13 is formed on the inner bottom surface of the hemispherical concave portion 15. The bolt loose insertion hole 12 penetrates the center of the concave curved spherical seat 13, and the concave curved spherical seat 13 is formed concentrically and annularly around the bolt loose insertion hole 12.

As another example, as shown in FIG. 5, a tool engaging ring 16 is integrally provided on the top surface of the nut 5 opposite to the convex curved spherical seat 11, and a tool is inserted into the tool engaging ring 16. A plurality of engaging grooves 17 for engaging and rotating the nut 5 are provided in the circumferential direction. The engagement groove 17 is a split groove that opens at the end face of the ring and terminates at the top face of the nut 5.

FIG. 3 shows an example in which the nut 5 and the seat plate 6 are used to tilt and attach the plate-like body as the mounting object 3.

As shown in FIG. 3, when the plate-like body as the mounting object 3 is to be assembled diagonally to the bolt 2 erected vertically from the structure 1, the tip of the bolt 2 is attached to the mounting object 3.
A nut 5 is loosely inserted into a mounting hole 4 provided at each corner of the barrel and is screwed to a bolt 2 via a seat plate 6 at an entrance side of the mounting hole 4 and a bolt via a seat plate 6 at an exit side. The plate-shaped body is fastened by a nut 5 screwed into the nut 2 so as to fasten the so-called double nut, and the fastening height of the mounting object 3 by the double nut with respect to the downstream bolt 2 and the upstream bolt 2 With a difference between them to achieve an inclined installation.

As shown in FIG. 4, for example, when the mounting object 3 having the slope 18 is to be fastened to the structure 1 via the bolt 2, the headed bolt 2 is loosely inserted into the mounting hole 4 and the mounting is performed. At the outlet side of the hole 4, the nut 5 is screwed to the bolt 2 via the seat plate 6 and fastened by a so-called single nut. Therefore, the copying target object 3 is mounted on the slope 18.

In each of FIGS. 3 and 4, when the bolt and nut are fastened, the nut 5 and the seat plate 6 are brought into contact with the convex curved spherical seat 1.
Slip occurs while maintaining an annular contact between the base 1 and the concave curved spherical seat 13 to absorb the inclination with respect to the seat plate 6. Therefore, the annular contact between the convex curved spherical seat 11 and the concave curved spherical seat 13 at the time of the inclined mounting of the mounting object 3 is ensured, and a sound fastening without looseness can be achieved.

The plate-shaped body as the mounting object 3 has the downstream fastening points P3 and P4 inclined (two-dimensionally inclined) with respect to the upstream fastening points P1 and P2, and the same with respect to the upstream fastening point P1. Even when the fastening point P2 is inclined (three-dimensionally inclined) and the same fastening point P4 is further inclined (three-dimensionally inclined) with respect to the downstream-side fastening point P3, sound fastening of the object 3 is enabled. That is, the convex spherical seat 11 and the concave spherical seat 13 maintain an annular contact with respect to the two-dimensional inclination and the three-dimensional inclination while sliding in all directions of 360 degrees.

The inclined mounting of the mounting object 3 is as follows.
For example, the present invention is effectively implemented for forming an inclined walking surface for a handicapped person, or for attaching a lid (attachment object 3) to an underground wiring box in an inclined manner.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view when a mounting object is inclinedly mounted using a conventional nut and seat plate pair.

FIG. 2 is a perspective view showing a case where an object to be attached is inclinedly attached using a nut / seat plate pair according to the present invention.

FIG. 3 is a cross-sectional view showing a state in which an object to be mounted is fastened with a double nut using the nut and seat plate pair in the present invention.

FIG. 4 is a cross-sectional view showing a state in which a mounting object is fastened to a structure with a single nut using a nut and a seat plate pair according to the present invention.

FIG. 5 is a perspective view of a nut and a seat plate showing another example of the nut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Structure 2 Bolt 3 Installation object 4 Mounting hole 5 Nut 6 Seat plate 8 Slope 10 Bolt screw hole 11 Convex curved spherical seat 12 Bolt play insertion hole 13 Concave curved spherical seat 14 Semispherical bulging part 15 Semispherical recess 16 Tool engagement ring 17 Engagement groove 18 Slope P1, P2 Upstream fastening point P3, P4 Downstream fastening point

Claims (2)

[Claims] 1. A structure of a nut and seat plate pair, wherein a seat surface of a nut for bolt screwing with respect to a seat plate is a convex curved spherical seat, and a seat surface of the seat plate for the nut is a concave curved spherical seat. . 2. A tool engaging ring is integrally provided on a top surface of the nut opposite to the convex curved spherical seat, and a tool is inserted into the tool engaging ring to engage and rotate the nut. 2. The structure of a nut and seat plate pair according to claim 1, wherein a plurality of engagement grooves are provided in a circumferential direction.