JP5873916B1 - Removal prevention device - Google Patents

Abstract

An object of the present invention is to provide an anti-detachment device in which a member fastened with a screw and fixed cannot be easily removed. An engagement portion 24 of a shaft 19 of a screw main body 12 is inserted into a through hole 15 of an outer ring 14 of a one-way clutch 11 that transmits a rotational force only in one direction, and the screw main body 12 is connected to the one-way clutch 11. The cap 13 has a screw groove 23 for rotating the screw main body 12, and the one-way clutch 11 and the screw main body 12 are engaged with each other. The portion engaged with the mating portion 24 is covered and fixed to the one-way clutch 11. [Selection] Figure 1

Description

 The present invention relates to a removal prevention device that prevents removal of a member fixed with a screw.

  For example, there is a device that prevents removal of a control board of a gaming machine such as a pachinko machine or a slot machine as a member that prevents removal of a member fixed with a screw. In gaming machines, game operations are controlled by various control boards such as a main control board and an effect control board on which electronic parts such as ROM storing various game control programs to be executed by the CPU are mounted. Yes.

  The board cases of these various control boards are detachable from the gaming machine so that inspection can be performed. Therefore, there is a possibility that the whole substrate case may be replaced with a counterfeit product (illegal product). Therefore, a chip-like electronic component called an IC tag is fixed to a part of the case that accommodates the control board, and when the IC tag is destroyed, the trace of the destruction is found, so that an illegal act is performed. It can be judged that it has been done (see Patent Document 1). In addition, there is a control board that is provided with a removal prevention member that prevents the control element from being removed, making it difficult to remove the control element mounted on the control board and preventing unauthorized ROM replacement (patent). Reference 2).

  In addition, the grating lid and manhole cover are also fixed with screws, but against the background of the rising price of steel materials, the theft cases where the grating lid and manhole cover are removed by removing the screws are rapidly increasing. Therefore, there is a removal prevention nut that can be installed quickly and easily and can prevent the theft of a grating lid, a manhole cover, or the like (see Patent Document 3).

JP 2007-296239 A JP 2004-154462 A JP 2012-246985 A

  However, in the gaming machines of Patent Documents 1 and 2, the IC tag and the control element removal prevention member must be separately prepared to prevent the control board from being removed, which increases the cost. Moreover, the removal prevention nut of patent document 3 forms the removal prevention protrusion protruded outside the said corner | angular part in one or more corner | angular parts of a nut main body, and uses general-purpose tools, such as a wrench and a spanner. The removal prevention nut is positioned in a recessed space where sufficient space cannot be secured, and the nut cannot be removed with a general-purpose tool such as a wrench or spanner, but a recessed space for storing the removal prevention nut is required. Become.

  An object of the present invention is to provide an anti-detachment device in which a member fastened with a screw and fixed cannot be easily removed.

  According to a first aspect of the present invention, there is provided the anti-removal device according to the first aspect of the present invention, wherein a one-way clutch that transmits rotational force only in one direction and an engaging portion of a shaft is inserted into a through-hole of an outer ring of the one-way clutch. And a screw body that protrudes from the engagement portion and has a screw portion on the shaft, and has a screw groove for rotating the screw body, and the one-way clutch and the engagement portion of the screw body are engaged with each other. And a cap fixed to the one-way clutch so as to cover the portion.

  The removal preventing apparatus according to a second aspect of the present invention is characterized in that, in the first aspect of the present invention, an escape groove is provided between the threaded portion and the engaging portion of the shaft of the screw body.

  A removal preventing device according to a third aspect of the present invention is the invention according to the first aspect, wherein the threaded portion of the threaded portion of the shaft of the threaded body has a threading end portion between the threaded portion and the engaging portion. The length of the cap on the threaded portion side is longer by the length of the terminal portion of the threaded portion of the threading.

  According to the first aspect of the present invention, since the engaging portion of the shaft of the screw main body is inserted into the through hole of the outer ring of the one-way clutch and engaged with the one-way clutch, the screw groove of the cap prevents the rotational force of the one-way clutch. The screw main body is tightened by rotating the screw. On the other hand, by rotating the screw groove of the cap in the reverse direction, the screw body is idled and the screw body cannot be removed. Therefore, it is not possible to remove the member that has been fastened and fixed by screws only by rotating the screw groove of the cap.

  According to the invention of claim 2, in addition to the effect of the invention of claim 1, the escape groove is provided between the threaded portion and the engaging portion of the shaft of the screw main body, so that the threading of the screw portion is performed by the relief groove. The screw body is tightened to the position of the cap.

  According to the invention of claim 3, in addition to the effect of the invention of claim 1, since the threading is performed without providing a relief groove between the screw part of the shaft of the screw body and the engaging part, the screw part is engaged. A threaded end portion is formed between the screw portion, and the length of the cap on the threaded portion side is increased by the length of the threaded end portion of the threaded portion. Tightening can be stopped without being obstructed by the end portion of the screw processing.

Sectional drawing of an example of the removal prevention apparatus which concerns on embodiment of this invention. Explanatory drawing of the fixing mechanism of the cap of the removal prevention apparatus which concerns on embodiment of this invention, and a one-way clutch. Sectional drawing of the other example of the removal prevention apparatus which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view of an example of a removal preventing apparatus according to an embodiment of the present invention. FIG. 1 (a) is an overall configuration diagram, FIG. 1 (b) is a cross-sectional view of a one-one-way clutch, and FIG. Sectional drawing of a screw main body, FIG.1 (d) is sectional drawing of a cap.

  As shown in FIG. 1A, the removal preventing device according to the embodiment of the present invention includes a one-way clutch 11, a screw body 12, and a cap 13.

  The one-way clutch 11 is a clutch that transmits a rotational force only in one direction. As shown in FIG. 1B, the outer ring 14 formed in a cylindrical shape has a through hole 15 into which the screw body 12 is inserted. A plurality of wedge-shaped spaces 16 are formed in the circumferential direction on the inner diameter surface of the outer ring 14, and the rolling elements 17 are accommodated in the wedge-shaped space 16, and the rolling elements 17 are pressed at one end of the outer ring 14. A leaf spring mechanism 18 is provided. The wedge-shaped space 16 has a wide part and a narrow part.

  When the screw main body 12 is inserted into the through hole 15, an engaging portion 24 of the screw main body 12 described later passes through the through hole 15, and the outer surface of the engaging portion 24 of the screw main body 12 and the outer surface of the rolling element 17 come into contact with each other. When the screw body 12 rotates in one direction, the rolling element 17 is pushed by the leaf spring mechanism 18 and moves from the wide part to the narrow part of the wedge-shaped space 16, and the rolling element 17 is moved in the wedge-shaped space 16. The engagement portion 24 of the screw main body 12 and the outer ring 14 are brought into mesh with each other, and the rotational force of the screw main body 12 is transmitted to the outer ring 14. On the other hand, when the screw body 12 rotates in the reverse direction, the rolling element 17 presses the leaf spring mechanism portion 18 and moves to the wide portion of the wedge-shaped space 16. As a result, the meshing state of the rolling elements 17 is released, the rotation of the screw body 12 is idle, and the rotational force is not transmitted to the outer ring 14. As described above, the one-way clutch 11 is a clutch that transmits the rotational force in only one direction of the screw body 12 to the outer ring 14, and can turn on / off transmission of rotational torque.

  As shown in FIG. 1 (c), the screw body 12 includes a shaft 19 and a head 20, and a screw portion 23 and an engaging portion 24 are provided between a screw tip 21 and a neck 22 of the shaft 19. Is provided. The screw portion 23 is provided so as to protrude from the engagement portion 24, and a relief groove 25 is provided between the screw portion 23 and the engagement portion 24. Then, a thread is formed on the thread portion 23, and the threading jig 25 is engaged with the engagement portion 24 so that the relief groove 25 is threaded in the entire area of the thread portion 23 when the thread portion 23 is threaded. It is for securing the distance which can move to the side. The engaging portion 24 is inserted into the through hole 15 of the outer ring 14 of the one-way clutch 11 and engages with the outer ring 14.

As shown in FIG. 1 (d), the cap 13 has a thread groove 26 for rotating the screw body 12, and a portion (press-fit portion) where the one-way clutch 11 and the engaging portion 24 of the screw body 12 are engaged. ) And is fixed to the one-way clutch 11. The cap 13 is fixed to the one-way clutch 11 by fitting a fitting groove provided on the outer peripheral surface of the outer ring 14 of the one-way clutch 11 and a fitting convex portion provided on the inner peripheral surface of the cap 13. 2 is an explanatory view of a fixing mechanism between the cap 13 and the one-way clutch 11, FIG. 2 (a) is a plan view seen from the left side of FIG. 1 (b), and FIG. 2 (b) is FIG. 1 (d). It is a cross-sectional plan view of the XX line. 2A, a plurality of fitting grooves 27 are provided on the outer peripheral surface of the outer ring 14 of the one-way clutch 11, and a plurality of fitting grooves 27 are provided on the inner peripheral surface of the cap 13, as shown in FIG. A fitting projection 28 that fits into the fitting groove 27 is provided. The cap 13 is fixed to the one-way clutch 11 by the fitting of the fitting groove 27 and the fitting convex portion 28. In the above explanation,
Although the fitting groove 27 is provided on the outer peripheral surface of the outer ring 14 of the one-way clutch 11 and the fitting convex portion 28 is provided on the inner peripheral surface of the cap 13, conversely, the fitting convex is provided on the outer peripheral surface of the outer ring 14 of the one-way clutch 11. The portion 28 may be provided, and the fitting groove 27 may be provided on the inner peripheral surface of the cap 13.

  In addition to fixing the cap 13 to the one-way clutch 11, in addition to fixing the fitting groove 27 and the fitting convex portion 28, heat caulking may be performed. For example, the cap 13 is formed of resin so as to have an opening that is smaller than the press-fitted portion, the press-fitted portion is inserted into the opening of the cap 13 and heat is applied, and the cap 13 and the press-fitted portion are fixed.

  As a result, the cap 13 and the one-way clutch 11 are fixed, so that the screw portion 23 of the screw main body 12 is tightened by rotating the screw groove 26 of the cap 13 in a direction that prevents the rotational force of the one-way clutch 11. . On the other hand, by rotating the screw groove 26 of the cap 13 in the reverse direction, the screw body 12 is idled and the screw body 12 cannot be removed.

  FIG. 3 is a cross-sectional view of another example of the removal preventing apparatus according to the embodiment of the present invention. Another example is a screwing end portion formed between the threaded portion 23 and the engaging portion 24 by threading without providing the escape groove 25 with respect to the example shown in FIG. 29 is left as it is, and the length of the cap 13 on the threaded portion 23 side is increased by the length of the terminal portion 29 of the threaded portion 23 in the threading process. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  When there is no escape groove, a threaded end portion 29 is formed between the threaded portion 23 and the engaging portion 24 by threading the threaded portion 23. This is because when the threaded portion 23 is threaded, it is not possible to secure a distance that the threading jig can move to the engaging portion 24 side so that the entire threaded portion 23 is threaded. In another example, as shown in FIG. 2, the threaded end portion 29 is left as it is, and the length of the cap 13 on the screw portion 23 side is the length Δd of the threaded end portion 29 of the screw portion 23. Just make it longer. Thereby, the screw part 23 of the screw main body 12 can be tightened without being obstructed by the terminal part 29 of the screw processing.

  As described above, according to the embodiment of the present invention, the one-way clutch 11 is arranged on the same axis as the axis of the screw main body 12, so that when the screw main body 12 is tightened, the screw portion is locked by the lock function of the one-way clutch 11. 23 rotates and the screw body 12 can be tightened. On the other hand, the screw body 12 can be removed after tightening because the idling function of the one-way clutch 11 does not transmit rotation to the screw portion 23. Therefore, the member fastened and fixed by the screw body 12 cannot be removed.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 ... One-way clutch, 12 ... Screw main body, 13 ... Cap, 14 ... Outer ring, 15 ... Through-hole, 16 ... Wedge-shaped space, 17 ... Rolling element, 18 ... Leaf spring mechanism part, 19 ... Shaft, 20 ... Head, 21 ... Screw tip, 22 ... Neck, 23 ... Screw part, 24 ... Engagement part, 25 ... Escape groove, 26 ... Screw groove, 27 ... Fitting groove, 28 ... Fitting convex part, 29 ... Terminal part of screw machining

Claims (3)

A one-way clutch that transmits torque in only one direction;
A screw body having a shaft engaging portion inserted into a through-hole of the outer ring of the one-way clutch to engage with the one-way clutch and having a threaded portion on the shaft protruding from the engaging portion;
A screw groove for rotating the screw body is provided, and a cap fixed to the one-way clutch is provided so as to cover a portion where the one-way clutch and the engagement portion of the screw body are engaged. Anti-removal device to do.   The removal prevention device according to claim 1, wherein an escape groove is provided between the screw portion and the engagement portion of the shaft of the screw main body. A threaded end portion of the threaded portion is provided between the threaded portion and the engaging portion of the shaft of the screw main body, and the length of the cap on the threaded portion side is the threaded length of the threaded portion. 2. The removal preventing apparatus according to claim 1 , wherein the length of the terminal portion is increased.

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