JP2013083305A - Mechanism for preventing looseness of screw, automatic transaction apparatus, and cash handling machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism for preventing looseness of a screw that prevents the screw from loosening without using adhesive.SOLUTION: A cam 14, in which a square rod part 12 of a rotary shaft 11 is fitted to a hole 14a, and a washer 17 with a claw, in which a projection 16 of the cam 14 is engaged with an engaging hole 18b, are fixed to the rotary shaft 11 using a bolt 19. In addition, the claw of the washer 17 with the claw is bent and raised in a direction of a head of the bolt 19 to abut against a flat part on a side in an axial direction of the head of the bolt 19.

Description

  The present invention relates to a screw loosening prevention mechanism that prevents loosening of a screw that has been tightened and fixed, an automatic transaction apparatus including the screw loosening prevention mechanism, and a cash processing machine.

  In a conventional screw loosening prevention mechanism, in a fixing portion such as an opening / closing lever or a key portion of a door of an apparatus, a hole having a shape corresponding to the I-cut shape is formed in a screw portion formed in an I-cut shape by cutting off both side surfaces in the axial direction. After inserting the washer with claw formed, fix the claw washer with the hexagon nut that is screwed with the screw part, bend the claw of the washer with claw after fixing, so that the hexagon nut does not rotate with that claw By locking, there are some that prevent loosening of the screw to prevent the lever, the key, and the like from falling off.

  For example, as shown in FIGS. 10 and 11, I-cut surfaces 119 having a cut I-cut shape are formed on both side surfaces in the axial direction of the screw portion 118 of the lock 111, and the key is inserted into the lock 111. When the lock 111 is rotated, the screw portion 118 and the cam 114 integrated with the lock 111 are rotated, and the shaft 115 is rotated. The cam 114 is formed with a hole that engages with the I-cut surface 119 of the screw portion 118 of the lock 111, and a hexagonal nut 113 is screwed to fix the cam 114 fitted to the screw portion 118. In order to prevent the hexagon nut 113 from loosening, a washer 117 with a claw formed of a thin sheet metal is used between the cam 114 and the hexagon nut 113.

  As shown in FIG. 12A, the washer 117 with a claw has a hole corresponding to the I-cut surface 119 of the screw part 118 of the lock 111, and is displaced by 45 degrees from the center of the hole. Three claws 117a, 117b, and 117c are formed. After inserting the cam 114 into the screw part 118, the claw washer 117 is inserted so that the hole fits into the screw part 118, and then fixed with the hexagon nut 113.

  After the cam 114 and the washer 117 with the claw are fixed by the hex nut 113, the claw portion 117b of the claw washer 117 parallel to the flat side surface of the hex nut 113 is bent, and the hex nut 113 is engaged with the claw portion 117b. Stop and prevent the hexagon nut 113 from loosening. As shown in FIG. 12B, the flat side surface of the hex nut 113 is displaced by 60 degrees from the center of the hole, so that any of the six side surfaces can be selected when the hex nut 113 is tightened. When any one of the claw portions of the claw washer 117 is bent on one surface, the side surface of the hexagon nut 113 and the claw portion of the claw washer 117 can be brought into substantially parallel contact with each other. The rotation of the hexagon nut 113 is restricted, and the occurrence of looseness can be prevented.

In the case of using bolts without using nuts, as shown in FIG. 13 (disassembled perspective view) and FIG. 14 (cross-sectional view), the cam fixing portion 110a of the rotating shaft 110 connected to the lever is a cam 114. Is formed in a cubic shape so as to be fitted to the rectangular through-hole 118, and a female screw portion 110b into which a bolt 119 is screwed to fix the cam 114 is formed at the center thereof. A cam 114 fixed to 110 rotates with the rotation of the rotating shaft 110. The height of the cam fixing portion 110 a of the rotating shaft 110 is formed to be lower by about 0.5 mm than the thickness of the cam 114 in order to securely fix the cam 114. For this reason, even if a claw washer with a hole formed in accordance with the shape of the cam fixing portion 110a of the rotating shaft 110 is used between the cam 114 and the bolt 119, the claw washer can be engaged with the cam fixing portion 110a. Therefore, the rotation of the bolt 119 cannot be restricted with respect to the rotating shaft 110, and the bolt is loosened.
In view of this, there is a type in which an adhesive is sealed in a hole penetrating from the upper surface of the bolt head to the bolt seat surface to bond the bolt seat surface and the object to be tightened to prevent loosening of the screw. (For example, refer to Patent Document 1).

JP-A-6-235413 (paragraphs “0012” to “0013”, FIG. 1)

However, in the above-described conventional technique, when both side surfaces in the axial direction of the screw portion are not formed in an I-cut shape or when the screw portion is fixed with a bolt, a washer with a claw that prevents the screw from loosening may be used. There is a problem that the screw cannot be prevented from loosening.
Also, if the screw and the object to be fastened are bonded by sealing the adhesive from the top surface of the bolt head, disassembly will be difficult, and maintenance work such as exchanging levers and keys will be difficult. There is a problem of becoming.
An object of the present invention is to solve such a problem, and an object of the present invention is to prevent loosening of a screw without using an adhesive.

  Therefore, the present invention is a screw loosening prevention mechanism that prevents loosening of a bolt that is screwed into a screw part, and includes a prism portion that protrudes in an axial direction, and a screw portion that is screwed into the bolt in the axial direction of the prism portion. A rotation shaft that rotates about the center of the screw portion as a rotation center, a polygonal hole that fits into the prism portion, and an engaged portion at a position spaced from the hole, A cam that rotates as the rotary shaft rotates; a through hole that fits into the bolt; a claw that is radially formed around the through hole; and an engaged portion of the cam that is spaced apart from the through hole. A plate-shaped washer with a claw formed with an engaging portion to be engaged, the cam in which the prismatic portion of the rotating shaft and the hole are fitted, and the engaged portion of the cam and the engagement The washer with the claw engaged with the part is fixed to the rotating shaft with the bolt. Both the claws of the claw washer, bent and raised in the direction of the head of the bolt, characterized in that is brought into contact with the flat portion of the side surface in the axial direction of the head of the bolt.

  According to the present invention as described above, the effect that the loosening of the screw can be prevented without using an adhesive is obtained.

Exploded perspective view of a screw loosening prevention mechanism in the first embodiment The perspective view of the screw loosening prevention mechanism in 1st Example The top view of the washer with a nail in the 1st example The top view of the washer with a nail | claw of the state which bent the nail | claw in 1st Example The top view of the screw loosening prevention mechanism in 1st Example Sectional drawing of the screw loosening prevention mechanism in 1st Example The perspective view of the washer with a nail | claw and cam in 2nd Example The perspective view of the washer with a nail | claw and cam in 3rd Example The perspective view of the washer with a nail | claw and cam in 4th Example Exploded perspective view of screw loosening prevention mechanism in conventional example The perspective view of the screw loosening prevention mechanism in a prior art example Perspective view of washer with nut and nut in conventional example The perspective view of the screw loosening prevention mechanism in a prior art example Sectional view of the screw loosening prevention mechanism in the conventional example The perspective view of the apparatus which attached the screw loosening prevention mechanism in 1st Example.

  Hereinafter, embodiments of a screw loosening prevention mechanism, an automatic transaction apparatus, and a cash processing machine according to the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view of the screw loosening prevention mechanism in the first embodiment, and FIG. 2 is a perspective view of the screw loosening prevention mechanism in the first embodiment.
1 and 2, a screw loosening prevention mechanism 1 that is used for a fixing part such as an opening / closing lever and a key part of a door of the apparatus and prevents a bolt that is screwed into the screw part includes a lever 10 and a rotary shaft 11. And a cam fixing portion 12, a screw portion 13, a cam 14, a shaft 15, a washer 17 with a claw, and a bolt 19.

For example, as shown in FIG. 15, the screw loosening prevention mechanism 1 includes an automatic teller machine and an unmanned contract machine installed in a financial institution such as a bank, an automatic ticket vending machine and an air ticket issuing machine installed in a transportation system, and the like. It is provided in the door of automatic transaction apparatus 100 or cash processing machine 101 etc. which performs counting of cash or creation of a banknote bundle.
The lever 10 is operated by an operator of the apparatus or the like and can be rotated in a direction indicated by an arrow B in FIG.

The rotary shaft 11 has a lever 10 attached to one end thereof, and rotates with the rotation of the lever 10.
The cam fixing portion 12 is formed in a substantially rectangular parallelepiped shape as a prism portion protruding in the axial direction at the end opposite to the end where the lever 10 of the rotating shaft 11 is attached. In this embodiment, the cam fixing portion 12 has a substantially rectangular parallelepiped shape, but is not limited thereto, and may have a substantially cubic shape or may be a polygonal column such as a triangular column or a hexagonal column.

The screw portion 13 is a female screw formed so as to extend in the axial direction at the center portion of the cam fixing portion 12 with the rotation center of the rotation shaft 11 as the center. The screw portion 13 is a portion into which the bolt 19 is screwed.
As described above, the rotating shaft 11 is formed with the cam fixing portion 12 and the screw portion 13, and rotates around the centers of the cam fixing portion 12 and the screw portion 13.

The cam 14 is a plate-like member such as a sheet metal that rotates with the rotation of the rotating shaft 11, and a through hole 14 a as a polygonal hole into which the cam fixing portion 12 of the rotating shaft 11 is fitted is formed in a square shape. ing. Accordingly, the cam 14 rotates in the direction indicated by the arrow A in FIG. 1 with the through hole 14a as the rotation center. In the present embodiment, the through hole 14a is described as having a rectangular shape, but is not limited thereto, and may be a polygon such as a triangle or a hexagon according to the shape of the cam fixing portion 12.
Further, the cam 14 is formed with a protrusion 16 as an engaged portion that engages with an engagement hole as an engagement portion formed in a claw washer 17 described later at a position spaced from the through hole 14a. ing.

The shaft 15 is a rod-shaped member formed at the end of the cam 14, moves with the rotation of the cam 14, and engages with an engagement portion on the apparatus side (not shown) and releases the engagement. It is.
The washer 17 with a claw is a plate-like member such as a sheet metal that prevents the bolt 19 from loosening, and a hole 18a as a through hole through which the male screw portion of the bolt 19 passes, and the cam 14 at a position spaced from the hole 18a. An engagement hole 18b is formed as an engagement portion that engages with the protrusion 16.

The male screw portion of the bolt 19 is passed through the hole 18a of the claw washer 17 and the engagement hole 18b is engaged with the protrusion 16 of the cam 14, so that the claw washer 17 14 and is rotatable about the hole 18a.
In addition, the claw washer 17 is formed with a plurality of claws that are radially arranged around the hole 18a while maintaining a predetermined angle. Details of the claw washer 17 will be described later.

  The bolt 19 is formed with a male screw portion that engages with the screw portion 13 of the cam fixing portion 12, and fixes the cam 14 and the washer 17 with the pawl to the rotating shaft 11. The head of the bolt 19 has six flat side surfaces on the side in the axial direction. In the present embodiment, the description will be made on the assumption that six flat side surfaces are formed on the head of the bolt 19. However, the present invention is not limited to this, and five or less or seven or more flat side surfaces are formed. May be.

FIG. 3 is a plan view of the washer with the claw in the first embodiment, and FIG. 4 is a plan view of the washer with the claw in a state where the claw is bent in the first embodiment.
In FIG. 3, the claw washer 17 is formed with three claws 17a, claws 17b, and claw 17c. Each claw 17a, claw 17b, and claw 17c extends radially about the center 18c of the hole 18a. Are arranged at a predetermined angle α (for example, 45 degrees). Since the claw washer 17 is formed of sheet metal or the like, each claw 17a, claw 17b, claw 17c is configured to be bendable as shown in FIG. FIG. 4 shows a state where the claw 17a is bent. Further, in this embodiment, the description will be made assuming that there are three claws, but the number of claws is not limited thereto, and may be two or less or four or more.

As shown in FIG. 1, any one of the three claws 17 a, claw 17 b, and claw 17 c formed on the claw washer 17 is bent in the direction of the head of the bolt 19, so that the flat portion of the claw is moved to the head of the bolt 19. It can be brought into contact with any one flat side surface of the section, and the rotation of the bolt 19 can be suppressed and the loosening can be prevented.
Further, an engagement hole 18b is formed at a position separated from the hole 18a, and the engagement hole 18b is substantially rectangular so as to extend from the center 18c of the hole 18a in order to absorb manufacturing errors and mounting errors. It is a long hole formed. In the present embodiment, the engagement hole 18b is described as a long hole, but the engagement hole 18b is not limited to the long hole as long as it can be engaged with the protruding portion with no gap in the rotation direction of the cam.

The operation of the above configuration will be described.
FIG. 5 is a plan view of the screw loosening prevention mechanism in the first embodiment, FIG. 6 is a sectional view of the screw loosening prevention mechanism in the first embodiment, and FIG. 6 is a CC sectional view in FIG.
5 and 6, the through hole 14a of the cam 14 is fitted to the cam fixing portion 12 of the rotating shaft 11, and the hole 18a of the washer 17 with the claw is aligned with the through hole 14a. 14 protrusions 16 are fitted. Thereafter, the bolt 19 is passed through the hole 18 a of the claw washer 17 and screwed into the screw portion 13 of the cam fixing portion 12, and the cam 14 and the claw washer 17 are fixed to the rotating shaft 11 by the bolt 19.

The height of the cam fixing portion 12 of the rotating shaft 11 is assumed to be lower by about 0.5 mm than the thickness of the cam 14 in order to securely fix the cam 14.
In this way, by engaging the engaging hole 18b of the claw washer 17 with the protrusion 16 of the cam 14, the claw washer 17 stops rotating with respect to the cam 14, and the rotating shaft 11, cam 14, claw The attached washer 17 and the bolt 19 rotate together.

  Further, after the bolt 19 is screwed into the screw portion 13 of the cam fixing portion 12 to fix the claw washer 17 and the cam 14, the claw washer corresponding to any flat side surface 19 b of the head portion 19 a of the bolt 19. The 17 claws 17a, the claw 17b, or the claw 17c (in this embodiment, the claw 17a) is bent and raised in the direction of the head 19a of the bolt 19 and comes into contact with the flat portion of the side surface 19b in the axial direction of the head 19a of the bolt 19. By doing so, rotation of the bolt 19 can be suppressed and loosening can be prevented.

  As described above, in the first embodiment, the engaging hole of the claw washer and the protrusion of the cam are fitted together, and the bolt is screwed into the screw portion of the cam fixing portion so that the claw washer and cam are connected. After fixing, the claw of the washer with a claw corresponding to one of the flat side surfaces of the bolt is bent and brought into contact with the side surface of the bolt, thereby suppressing the rotation of the bolt and preventing the loosening. Is obtained.

FIG. 7 is a perspective view of a washer with a claw and a cam in the second embodiment. Note that parts similar to those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
In FIG. 7, the claw washer 17 has two bent portions (bending portions) 20 as engaging portions that sandwich both side portions (engaged portions) in the rotational direction of the cam 14 (the direction indicated by the arrow A in the figure). Is formed.
By engaging the two bent portions 20 of the claw washer 17 with both side surfaces of the cam 14, the claw washer 17 stops rotating with respect to the cam 14, and the rotating shaft 11, the cam 14, the claw washer 17, And the bolt 19 rotates integrally.

  Therefore, as in the first embodiment, the bolt 19 is screwed to the screw portion 13 of the cam fixing portion 12 to fix the claw washer 17 and the cam 14, and then the head portion of the bolt 19 as shown in FIG. The claw 17a, claw 17b, or claw 17c of the washer 17 with the claw corresponding to any flat side surface 19b of 19a is bent and raised in the direction of the head 19a of the bolt 19, and the side surface 19b of the bolt 19 in the axial direction of the head 19a. By abutting against the flat portion of the bolt, rotation of the bolt 19 can be suppressed and loosening can be prevented.

  As described above, in the second embodiment, after bending the claw washer and the side surface of the cam, and engaging the bolt with the screw portion of the cam fixing portion to fix the claw washer and the cam. By bending and raising the claw of the washer with the claw corresponding to any flat side surface of the bolt and bringing it into contact with the side surface of the bolt, it is possible to suppress the rotation of the bolt and prevent loosening. .

FIG. 8 is a perspective view of a washer with a claw and a cam in the third embodiment. Note that parts similar to those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
In FIG. 8, a through-hole 21 is formed in the claw washer 17 as an engaging portion that allows the shaft 15 (engaged portion) of the cam 14 to pass therethrough.
By fitting the through hole 21 of the claw washer 17 and the shaft 15 of the cam 14, the claw washer 17 does not rotate with respect to the cam 14, and the rotating shaft 11, the cam 14, the claw washer 17, and the bolt 19 rotates together.

  Therefore, as in the first embodiment, the bolt 19 is screwed to the screw portion 13 of the cam fixing portion 12 to fix the claw washer 17 and the cam 14, and then the head portion of the bolt 19 as shown in FIG. The claw 17a, claw 17b, or claw 17c of the washer 17 with the claw corresponding to any flat side surface 19b of 19a is bent and raised in the direction of the head 19a of the bolt 19, and the side surface 19b of the bolt 19 in the axial direction of the head 19a. By abutting against the flat portion of the bolt, rotation of the bolt 19 can be suppressed and loosening can be prevented.

  As described above, in the third embodiment, the through hole of the washer with the claw and the shaft of the cam are fitted, and the bolt is screwed into the screw portion of the cam fixing portion to fix the washer with the claw and the cam. After that, the claw of the washer with the claw corresponding to one of the flat side surfaces of the bolt is bent and brought into contact with the side surface of the bolt, thereby suppressing the rotation of the bolt and preventing the loosening. It is done.

FIG. 9 is a perspective view of a washer with a claw and a cam in the fourth embodiment. Note that parts similar to those of the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.
In FIG. 9, a bent portion (convex portion) 22 as an engaging portion that engages with a square hole 14 a (engaged portion) as a concave portion formed in the cam 14 is formed at the end of the claw washer 17. Has been.
By engaging the bent portion 22 of the claw washer 17 and the square hole 14a of the cam 14, the claw washer 17 stops rotating with respect to the cam 14, and the rotating shaft 11, the cam 14, the claw washer 17, and The bolt 19 rotates as a unit.

  Therefore, as in the first embodiment, the bolt 19 is screwed to the screw portion 13 of the cam fixing portion 12 to fix the claw washer 17 and the cam 14, and then the head portion of the bolt 19 as shown in FIG. The claw 17a, claw 17b, or claw 17c of the washer 17 with the claw corresponding to any flat side surface 19b of 19a is bent and raised in the direction of the head 19a of the bolt 19, and the side surface 19b of the bolt 19 in the axial direction of the head 19a. By abutting against the flat portion of the bolt, rotation of the bolt 19 can be suppressed and loosening can be prevented.

  As described above, in the fourth embodiment, the bending of the claw washer and the square hole of the cam are engaged, and the bolt is screwed into the screw portion of the cam fixing portion to fix the claw washer and the cam. After that, the claw of the washer with the claw corresponding to one of the flat side surfaces of the bolt is bent and brought into contact with the side surface of the bolt, thereby suppressing the rotation of the bolt and preventing the loosening. It is done.

DESCRIPTION OF SYMBOLS 1 Screw loosening prevention mechanism 10 Lever 11 Rotating shaft 12 Cam fixing part 13 Screw part 14 Cam 14a Hole 15 Shaft 16 Protrusion part 17 Washer with nail | claw 17a, 17b, 17c Nail | claw 18a hole 18b Engagement hole 19 Bolt 19a Head part 19b Side surface 20 , 22 Bending part 21 Through hole 100 Automatic transaction apparatus 101 Cash processing machine

Claims (8)

A screw loosening prevention mechanism for preventing loosening of a bolt screwed into the screw part,
A rotating shaft that is formed with a prism portion protruding in the axial direction and a screw portion that is screwed with the bolt in the axial direction of the prism portion, and that rotates about the center of the screw portion as a rotation center;
A polygonal hole that fits into the prismatic part, and an engaged part formed at a position spaced from the hole, and a cam that rotates with the rotation of the rotating shaft;
A through hole that fits into the bolt, a claw radially formed around the through hole, and an engaging portion that is spaced apart from the through hole and engages with the engaged portion of the cam are formed. With a plate-like washer with nails,
The cam in which the prism portion of the rotating shaft and the hole are fitted, and the washer with the claw in which the engaged portion and the engaging portion of the cam are engaged are fixed to the rotating shaft with the bolt. And
A screw loosening prevention mechanism characterized in that the claw of the washer with the claw is bent and raised in the direction of the head of the bolt and is brought into contact with a flat portion of a side surface in the axial direction of the head of the bolt. The screw loosening prevention mechanism according to claim 1,
The engaged portion is a protrusion,
The screw loosening prevention mechanism, wherein the engaging portion is a hole with which the protruding portion is engaged. The screw loosening prevention mechanism according to claim 1,
The engaged parts are both side parts in the rotational direction of the cam;
The screw loosening prevention mechanism, wherein the engaging portion is a bent portion sandwiching the both side portions. The screw loosening prevention mechanism according to claim 1,
The engaged portion is a shaft provided on the cam;
The screw loosening prevention mechanism, wherein the engaging portion is a hole into which the shaft is fitted. The screw loosening prevention mechanism according to claim 1,
The engaged portion is a recess,
The screw loosening prevention mechanism, wherein the engaging part is a convex part engaging with the concave part. The screw loosening prevention mechanism according to any one of claims 1 to 5,
A screw loosening prevention mechanism, wherein a plurality of claws of the washer with claws are formed in a radial manner with a predetermined angle centered on the through hole. An automatic transaction apparatus having a screw loosening prevention mechanism for preventing loosening of a bolt screwed into a screw part,
A rotating shaft that is formed with a prism portion protruding in the axial direction and a screw portion that is screwed with the bolt in the axial direction of the prism portion, and that rotates about the center of the screw portion as a rotation center;
A polygonal hole that fits into the prismatic part, and an engaged part formed at a position spaced from the hole, and a cam that rotates with the rotation of the rotating shaft;
A through hole that fits into the bolt, a claw radially formed around the through hole, and an engaging portion that is spaced apart from the through hole and engages with the engaged portion of the cam are formed. With a plate-like washer with nails,
The cam in which the prism portion of the rotating shaft and the hole are fitted, and the washer with the claw in which the engaged portion and the engaging portion of the cam are engaged are fixed to the rotating shaft with the bolt. And
An automatic transaction comprising a screw loosening prevention mechanism that bends and raises the claw of the washer with the claw toward the head of the bolt and abuts against a flat portion of a side surface in the axial direction of the head of the bolt. apparatus. A cash processing machine having a screw loosening prevention mechanism for preventing loosening of a bolt screwed into a screw part,
A rotating shaft that is formed with a prism portion protruding in the axial direction and a screw portion that is screwed with the bolt in the axial direction of the prism portion, and that rotates about the center of the screw portion as a rotation center;
A polygonal hole that fits into the prismatic part, and an engaged part formed at a position spaced from the hole, and a cam that rotates with the rotation of the rotating shaft;
A through hole that fits into the bolt, a claw radially formed around the through hole, and an engaging portion that is spaced apart from the through hole and engages with the engaged portion of the cam are formed. With a plate-like washer with nails,
The cam in which the prism portion of the rotating shaft and the hole are fitted, and the washer with the claw in which the engaged portion and the engaging portion of the cam are engaged are fixed to the rotating shaft with the bolt. And
A cash process comprising a screw loosening prevention mechanism that bends and raises a claw of the washer with the claw toward a head portion of the bolt and abuts against a flat portion of a side surface in the axial direction of the head portion of the bolt. Machine.

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