JPH09183070A - Jig for turning nut - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a jig for turning and fastening a special nut in such a way that the nut is freely removable or for removing the special nut which is adapted for preventing the theft of equipment installed outdoors with stud bolts and nuts, such as an automatic vendor or a parking meter. SOLUTION: A projected broadening part 1 is formed on the inner surface of a jig main body 4, and a pair of first and second through holes 5, 6 are provided in such a way that they are separate from each other along the direction of the axis of the jig main body 4 and the circumferential direction of the main body 4. First and second claws 7, 8 are mounted in the respective through holes 5, 6 in such a way that they are freely movable in their radial directions. A holder 10 matching the outer periphery 3 of the jig main body 4 is freely removably fitted to the outer periphery 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a nut for screwing or fastening a special anti-theft nut that is installed outdoors via stud bolts and nuts such as various vending machines and parking meters. Special jig for screwing.

[0002]

2. Description of the Related Art Various vending machines and parking meters installed outdoors have anchor bolts projectingly fixed to the foundation concrete on which they are installed, and the flanges of equipment such as vending machines are mounted with nuts and anchor bolts. It was fastened and fixed to the foundation concrete.

[0003]

However, such a nut can be easily removed with a wrench or the like which is a widely used tool. Therefore, the device itself such as the vending machine may be stolen. Especially for equipment installed on the road side, the vending machine and the like can be taken away in a relatively short time by a small mobile crane or the like.
Therefore, the present inventor has already proposed in JP-A-6-330551 a special anti-theft nut that cannot be removed with the installation nuts of various devices. The present invention has an object to provide a jig for screwing for fastening and removing the special nut, and has the following configuration to achieve the object.

[0004]

A jig for screwing a nut according to the present invention is formed into a chevron-shaped inner surface having an expanding portion 1 whose inner circumference expands to one end side, and is formed on the outer surface on the other end side. A jig body 4 having a screw tool fitting portion 2 and an outer periphery 3 of the cross section perpendicular to the axis on the one end side formed in a circle, and a jig body 4 spaced apart from each other in the axial direction and the circumferential direction. The pair of first through holes 5 and second through holes 6 penetrating from the outer surface to the inner surface, and the cross-sections match the cross-sections of the first through-holes 5 and second through-holes 6 and are movable in the radial direction. Mounted on the jig main body 4
A pair of first and second claws 7 and 8 which are aligned with the outer periphery 3 of the jig body and project into the expanding portion 1 with the outer periphery ends aligned with the outer periphery 3 of the jig body 4. 9, and a holding body 10 which is detachably fitted to the outer periphery 3 thereof.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway view of the jig of the present invention, and is an explanatory view when fastening a special nut with the jig. 2 is an axial sectional view showing the same fastening state, FIG. 3 is an explanatory view showing a preparatory stage of the fastening process, and FIG.
It is a fastening explanatory view showing a place where the jig is screwed by. As shown in FIGS. 1 and 2, the jig of the present invention fastens and fixes a nut 18 having a special outer peripheral shape. The nut 18 has an approximately trapezoidal cross-section outer periphery and a rotation curved surface on the outer periphery. Then, a pair of first slits 14 and second slits 15 for tool fitting are formed at positions different from each other in the circumferential direction and the axial direction of the outer peripheral surface, and screw holes 16 are provided on the axis.

Next, in the jig of the present invention for fastening such a special nut, the jig body 4 has a chevron-shaped inner peripheral cross section, and has a widened portion 1 at one end opening thereof. The outer periphery 3 of the jig body 4 is stepped so that the diameter on the other end side is reduced, and the outer peripheral surface on the reduction side is formed into a hexagon, and the screw tool fitting portion 2 such as a spanner is formed therein. . Further, the outer periphery 3 of the jig body 4 except the screw tool fitting portion 2 is formed in a circular shape. Further, the expansion portion 1 and the outer periphery 3 of the jig body 4
There are provided a pair of first through holes 5 and second through holes 6 penetrating in the radial direction, and they are arranged apart from each other in the axial direction and the circumferential direction. Then, a pair of first claw 7 and second claw 8 is attached to each of the first through hole 5 and the second through hole 6. The first claw 7 and the second claw 8 are the first through hole 5 and the second claw 8.
It has a cross section that substantially matches the cross section of the through hole 6, and the outer peripheral ends thereof match the outer circumference 3 of the jig body 4. Then, with the outer peripheral edge aligned, part of the first claw 7 and the second claw 8 projects into the expanded portion 1. The first claw 7 and the second claw 8 are mounted so as to be movable in the radial direction.

In this example, the outer peripheral ends of the first pawl 7 and the second pawl 8 are each formed in an arc shape, and the arc length of the second pawl 8 is larger than that of the first pawl 7. In addition, a long hole 12 penetrates through the first claw 7 and the second claw 8 in the thickness direction, and the long axis of the long hole 12 is located in the radial direction. The jig body 4 is provided with first through holes 5 and second through holes 6 parallel to the axial direction at positions aligned with the elongated holes 12, and pins 11 are press-fitted into the respective through holes 5 and 6. , It loosely fits into the long holes 12 of the second pawl 8 and the first pawl 7. The pin 11 has a diameter slightly smaller than the short diameter of the long hole 12. Next, the holder 10 is detachably fitted on the outer periphery of the jig body 4. The inner circumference 9 of the holder 10 is the jig body 4
To match the outer circumference 3 of. The holding body 10 is entirely formed in a tubular shape, and a flange 20 is provided at one end thereof.

[0008]

[How to use] As shown in FIG. 1, a stud bolt 19 is planted on a foundation concrete 22 via an anchor or the like, and a bolt insertion hole 21 of a flange 23 of a vending machine or the like is inserted into the stud bolt 19. Next, the nut 18 is screwed onto the stud bolt 19 so that it can be screwed with a finger. Then, FIG.
As shown in FIG. 5, the expanded portion 1 of the jig body 4 is fitted on the outer circumference 13 of the nut 18. Then, the jig body 4 is rotated around the axis while the pair of the first claw 7 and the second claw 8 is lightly pushed to the center side by the fingers. Then, the first claw 7 and the second claw 8 are fitted into the first slit 14 and the second slit 15 of the nut 18, and the both claws 7 and 8 are
Moves to the center side in the radial direction. Along with this, the outer peripheral ends of the first claw 7 and the second claw 8 are aligned with the outer periphery 3 of the jig body 4. Therefore, the holder 10 is fitted on the outer periphery 3 of the jig body 4. As a result, the first claw 7 and the second claw 8 cannot move outward in the radial direction. In this state, the tip of the screw tool 17 such as a spanner is fitted to the screw tool fitting portion 2 as shown in FIG. 4, and the screw tool 17 is rotated. Then, the jig body 4
The nut 18 rotates via the first and second claws 7 and 8 of the nut 18 and is fastened and fixed to the stud bolt 19.

[0009]

[Modification] In this example, the hexagonal screw tool fitting portion 2 is formed on the outer peripheral surface on the other end side of the jig body 4, but a hexagonal hole for fitting a hexagon wrench may be formed on the other end surface itself. . In that case, the other end surface of the jig body 4 is closed. Also nut
The first slit 14 and the second slit 15 of 18 can be formed in an appropriate shape, and the first claw 7 and the second claw 8 having a corresponding shape are formed at the edge portion on the radial center side, It may be configured so that they match.

[0010]

The operation and effect of the present invention is as follows.
The inner circumference of the jig body 4 has a special shape, and the pair of the first claw 7 and the second claw 8 mounted in the first through hole 5 and the second through hole 6 of the jig body 4 is a jig. Since they are arranged apart from each other in the axial direction and the radial direction of the main body 4, it is possible to screw a special nut that cannot be screwed with a normal tool. This special nut has its outer circumference 13 aligned with the expanded portion 1 on the inner circumference of the jig body 4, and also aligned with the protruding portions of the first and second claws 7 and 8 protruding on the inner surface of the expanded portion 1. A pair of first slit 14 and second slit 15 are formed on the outer circumference 13. And, as an example, securely fix the fixing nuts for theft prevention of various devices that store money such as vending machines and parking meters that are placed outdoors,
Alternatively, it becomes possible to remove it. At the time of this screwing, the pair of the first claw 7 and the second claw 8 is first attached to the first nut 18 of the nut 18.
Fit into the slit 14 and the second slit 15. Then, the holder 10 is fitted on the outer circumference of the jig body 4, and the pair of the first claw 7 and the second claw 7
The pawl 8 is held so as not to move radially outward. Then, the screw tool may be fitted into the screw tool fitting portion 2 of the jig body 4 and rotated.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a state in which a jig of the present invention is partially broken, and when a special nut is fastened by the jig.

FIG. 2 is an axial sectional view showing the fastening state.

FIG. 3 is an explanatory view showing a preparatory stage of the fastening step.

FIG. 4 is an explanatory view showing a state where the jig is screwed and fastened by a screwing tool 17.

[Explanation of symbols]

 1 Expansion Part 2 Screw Tool Fitting Part 3 Outer Perimeter 4 Jig Body 5 First Through Hole 6 Second Through Hole 7 First Claw 8 Second Claw 9 Inner Circumference 10 Holding Body 11 Pin 12 Long Hole 13 Outer Circumference 14th 1 slit 15 2nd slit 16 screw hole 17 screw tool 18 nut 19 stud bolt 20 flange 21 bolt insertion hole 22 foundation concrete 23 flange

Claims (3)

[Claims] 1. A widening portion 1 in which an inner circumference of a shaft section widens to one end side.
A jig body 4 which is formed into a mountain shape having an inner surface and has a screw tool fitting portion 2 on the outer surface on the other end side, and the outer periphery 3 of the cross section perpendicular to the axis on the one end side is formed in a circular shape; The jig body 4 is separated from each other in the circumferential direction,
The pair of first through holes 5 and second through holes 6 penetrating from the outer surface to the inner surface, and the cross-sections match the cross-sections of the respective first through-holes 5 and second through-holes 6 and are movable in the radial direction. A pair of first claw 7 and second claw 8 which are mounted on the outer peripheral edge of the jig main body 4 and are aligned with the outer periphery 3 of the jig body 4, and project into the expanding portion 1 in the aligned state of the outer peripheral edge. A jig for nut screwing, comprising an inner circumference 9 that matches the outer circumference 3 of the jig body 4, and a holder 10 that is detachably fitted to the outer circumference 3. 2. Each of the first through hole 5 and the second through hole 6
A pair of pins 11 penetrates in parallel to the axial direction,
11 is loosely fitted in the long holes 12 of the first claw 7 and the second claw 8,
A jig for screwing a nut in which the claw 7 and the second claw 8 are held movably in the radial direction. 3. The jig according to claim 1 or 2, wherein the following nut is screwed. The outer periphery 13 is aligned with the expanding portion 1, and the pair of first slits 14 and 2 are aligned with the projecting portions of the first claw 7 and the second claw 8 in a state of protruding on the inner surface of the expanding portion 1. A slit 15 is formed in the outer circumference 13 and a screw hole 16 is provided on the axis.