JP3572491B2 - Nuts and tools for fastening them - Google Patents

Description

[0001]
[Industrial applications]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a special nut for preventing theft of equipment such as various vending machines and parking meters that are installed through foundation bolts and nuts outdoors.
[0002]
[Prior art]
For various vending machines and parking meters installed outdoors, anchor bolts are protruded and fixed to the foundation concrete where they are installed, and the flanges of equipment such as vending machines are fastened and fixed to the foundation concrete via nuts and anchor bolts Was.
[0003]
[Problems to be solved by the invention]
However, such a nut can be easily removed with a widely used spanner or the like. Therefore, there are cases where devices such as vending machines themselves are stolen. In particular, with respect to the equipment installed along the road, a small crane truck or the like can take the vending machine or the like in a relatively short time.
Therefore, an object of the present invention is to provide a special anti-theft nut and a tool for fastening the nut, in which a nut for installing various devices cannot be easily removed, and the following configuration is used to achieve the object. .
[0004]
[Means for Solving the Problems]
The nut of the present invention has a nut main body 1 having a substantially trapezoidal outer periphery in a shaft cross-section and an outer periphery formed as a trapezoidal rotation curved surface, and has a different circumferential and axial direction of the outer peripheral surface of the main body 1 from each other. At a position, a pair of slits 2 and 3 for tool fitting formed in a groove shape ,
The pair of slits 2 and 3 are formed at positions different from each other by 180 ° in the circumferential direction and parallel to each other .
In a preferred embodiment, the substantially trapezoidal slope is formed in a bowl shape having a curved surface slightly convex outward.
[0005]
【Example】
Next, an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a nut of the present invention, FIG. 2 is a perspective view of the nut and a fastening tool 7, FIG. 3 is a side view of the same, and FIG. FIG.
As shown in FIGS. 1 and 3, the nut of the present invention is a bowl-shaped nut body 1 having a substantially trapezoidal outer periphery in the axial section of the nut main body 1 and a curved surface having a slope that is slightly convex outward. is there. And an inner screw 9 is threaded at the center. A pair of slits 2 and 3 are formed in a groove shape in parallel with each other on the outer peripheral surface of the nut main body 1 which is different from each other by 180 ° in the circumferential direction, with the height in the axial direction being different by H. It is provided parallel to the axis.
[0006]
Next, as shown in FIGS. 2 and 3, the fastening tool 7 for fastening and removing the nut has a pair of nut gripping portions 5 and 6 formed bifurcated in a plan view at one end of the flat handle portion 4. In this case, the heights in the thickness direction of the nut gripping portions 5 and 6 are different from each other by H. At the same time, the distance between the inner surfaces of the pair of nut gripping portions 5 and 6 is equal to the distance between the groove bottoms of the slits 2 and 3 in the nut.
Note that the handle portion 4 has a higher planar height than the nut grip portions 5 and 6. Since the nut is installed on the base concrete 13 as shown in FIG. 4, the handle 4 of the fastening tool 7 is positioned above the base concrete 13 so that it can be easily gripped. .
Then, as shown in FIGS. 2 to 4, the bolt insertion hole of the flange 11 of the device 10 is inserted into the anchor bolt 8 projecting from the base concrete 13, and the nut body 1 is connected to the anchor bolt 8 via the washer 12. Screw it. Then, as shown in FIGS. 2 and 3, the pair of nut grippers 5, 6 of the fastening tool 7 may be fitted into the slits 2, 3 of the nut body 1 and screwed. In order to remove the nut, the nut may be screwed in the direction opposite to the fastening direction.
[0007]
[Action and Effect of the Invention]
Since the outer periphery of the nut of the present invention is formed in a substantially trapezoidal rotating curved surface, the outer peripheral surface cannot be gripped by a normal gripping tool.
In addition, the pair of slits 2 and 3 for tool fitting are arranged at positions different from each other in the axial direction, are formed so-called steps, and each of the slits 2 and 3 is formed in a groove shape. , 3 are formed 180 ° circumferentially different from each other and parallel to each other, so that they are securely gripped by a tool having a fitting portion to be fitted into each of the grooved slits 2, 3 and rotated. Can be fastened or loosened.
At this time, since the slits 2 and 3 are formed in a groove shape, the fitting portion of the tool is prevented from coming off without moving in the axial direction, and the tool can be stably fitted. In particular, the slits 2 and 3 formed stepwise have a relatively poor balance. However, since the slits 2 and 3 are parallel to each other and formed in a groove shape, it is necessary to stably attach and detach the nut with a fastening tool. Becomes possible.
[Brief description of the drawings]
FIG. 1 is a perspective view of a nut according to the present invention.
FIG. 2 is a perspective view of a nut and a fastening tool 7 of the present invention.
FIG. 3 is a side view of the same.
FIG. 4 is a partially cutaway elevational view showing a use state of the present nut.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Nut main body 2, 3 Slit 4 Handle 5, 6 Nut gripping part 7 Fastening tool 8 Anchor bolt 9 Inner screw 10 Equipment 11 Flange 12 Washer 13 Base concrete

Claims (2)

A nut body 1 having a substantially trapezoidal outer periphery in the axial cross-section and an outer periphery formed as a trapezoidal rotating curved surface, and a groove-like shape formed at different positions in the circumferential direction and the axial direction of the outer circumferential surface of the body 1 respectively. A pair of slits 2 and 3 for tool fitting formed ,
A nut in which the pair of slits 2 and 3 are formed at positions different from each other by 180 ° in the circumferential direction and parallel to each other . The bowl-shaped nut according to claim 1, wherein the substantially trapezoidal slope is formed as a curved surface slightly convex outward.

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