JP2006344175A5 - - Google Patents

Description

Coin retrograde device for coin feeding device

The present invention relates to a coin reversal prevention device for a coin feeding device that guides coins aligned in a row with their peripheral surfaces in contact with each other.
More particularly, the present invention relates to a coin retrograde prevention device that prevents a noise that is generated when a coin sent to a predetermined position by a rotating disk falls due to gravity and moves backward and collides with a coin or a rotating disk that is sent out next.
More particularly, the present invention relates to a coin reverse prevention device that prevents coins from being reversed by preventing a coin from being reversed by preventing a coin from being reversed by a one-way stopper by preventing the coins fed to a predetermined position by a feeding arm of a rotating disk.
The “coin” used in this specification includes a coin as a currency, a token of a game machine, and the like.

As a first prior art, a device is known in which coins that are fed obliquely one by one by rotating feed blades are guided vertically upward by an escalator (guide device) and then paid out from the tip.
In this apparatus, it is known that a taper roller is disposed immediately after a rotating feed blade (rotating disk) in order to smoothly change the direction of the coin sent out obliquely upward in the vertical direction (for example, Patent Document 1). ).
As a second prior art, in order to prevent coins in an escalator (guide device) from falling, it is known that a holding device comprising a ball and an inclined surface is provided on a guide device that suspends (for example, Patent Documents). 2).

Patent No. 2514877 (Figs. 1-3, 2-5) Actual Fairness 4-45090 (Figures 1-4, pages 1-2)

In the first prior art, the diameter portion of the coin (first sheet) immediately after being sent out by the feed blade cannot pass between the first taper roller and the other taper rollers, and is subsequently sent out. It is pushed by the first coin and passes through the first taper roller portion.
For this reason, until the first coin is pushed by the next coin that is intermittently sent out, the coin falls due to the inclination.
When this falling coin collides with a subsequent coin and when there is no coins on hold, the falling coin collides with the rotating disk, thereby generating a noise “crash”.
When this coin delivery device is used in a game machine, there is a problem that it is not possible to concentrate on the game due to the above-mentioned “click” sound.

This problem will be described in detail with reference to FIGS.
In FIG. 6, a coin feeding device 10
(Hereinafter referred to as “hopper”) includes a frame 12, a cylindrical bowl 16 that is fixed to the frame 12 and stores the coin 14, and a first coin 14 that is disposed at an inclination at the bottom of the bowl 16. A rotating disk 18, a second rotating disk 20, and a coin guide device 22 are provided.

As shown in FIG. 7, the coin that has fallen into the through-hole 24 of the first rotating disk 18 is pushed by an extrusion protrusion (not shown) on the lower surface of the rotating disk 18 while being supported by the slide base 26, It is rotated in the clockwise direction and guided in the circumferential direction of the rotary disk 18 by a guide 28 protruding into the coin passage.

The second rotating disk 20 has a star shape having five protrusion-like extruded bodies 30 at equal intervals, and rotates in the reverse direction in synchronization with the first rotating disk 18.
The function of the second rotating disk 20 is to receive the coins fed one by one from the first rotating disk 18 by the pusher 30 and transfer them one by one along the arcuate guide surface 32.
The structures and functions of the first rotating disk 18 and the second rotating disk 20 are the same as those disclosed in Patent Document 1.

A gate device 34 is disposed next to the second rotating disk 20.
In the gate device 34, a roller 40 having a downward taper is rotatably attached to a support shaft 38 slidably inserted in a guide groove 36 extending in a direction orthogonal to the coin traveling direction, and the support shaft 38 is fixed. The coin passage 46 is biased by a spring 44 hooked between the pin 42 and the pin 42.
Usually, the support shaft 38 is locked to the end of the guide groove 36, and is stationary at a position where the distance from the guide surface 32 is smaller than the diameter of the coin.

When the coin passes, the roller 40 is moved by the coin along the guide groove 36, and after the maximum diameter portion of the coin has passed, the roller 40 is moved to approach the guide surface 32 by the spring 44 and stops at the position.
Therefore, the coin that has passed through the gate device 34 slides down due to its own weight, and even if it tries to return to the second rotating disk 20 side, the distance between the roller 40 and the guide surface 32 is smaller than the coin diameter, so that it is stopped by them. It is difficult to return.

However, the arrangement of the roller 40 is limited to avoid buffering with the second rotating disk 20.
As a result, the coin 14 pushed out by the tip of the extruded body 30 cannot pass between the roller 40 and the guide surface 32 in the diameter portion, as indicated by a chain line in FIG.
In other words, the first coin 14 sent out from the second rotating disk 20 cannot pass through the gate device 34.

Therefore, the first coin 14 can only pass through the gate device 34 by being pushed by the second coin 14 that is intermittently fed out by the next extruded body 30.
Therefore, the first coin 14 that could not pass through the gate device 34 slides down the slide base 26 due to the inclination and collides with the next coin 14.
When there is no next coin 14, the slipped coin 14 collides with the next extruded body 30.
Due to these collisions, the above-mentioned “clicking sound” is generated.
When there is no coin 14, there is a problem that the falling distance is large, and thus the “click” sound is further increased.

When the gate device 34 is not provided, the coin 14 pushed up by the extruding body 30 falls and collides with the next coin 14 or the extruding body 30, and similarly a “clacking” sound is generated.
In this case, since the weight of many coins 14 in the guide device 22 is also added, a larger noise is generated.
In addition, when there are a large number of coins 14 in the guide device 22, the weight of the coin 14 increases, the pushing force to move the roller 40 of the gate device 34 away from the guide surface 32 increases, and the gate device 34 does not prevent the fall, The entire coin 14 in the guide device 22 may fall and collide with the extruded body 30.
In this case, since the weight is large, there is a problem that a loud collision sound is generated.
The coin 14 that has passed through the gate device 34 is guided by the curved portion guide portion 48 of the coin guide device 22 and the linear portion guide portion 50 extending vertically upward, and is paid out by the tip-out device 52.

The second prior art provides a holding device consisting of a ball and an inclined surface, moves the ball falling by its own weight to the side plate side by the inclined surface, and prevents the coin from falling by quickly pressing the coin against the side plate by the ball. is doing.
Therefore, when the coin passage is inclined, the movement of the ball is based on the movement of the coin. Therefore, the coin cannot be pressed against the side plate by the ball immediately, and there is a problem that the amount of coin falling is large.
In other words, the second prior art is effective when it is almost vertically suspended.
In addition, substantially standing means a range from 80 degrees to 110 degrees with respect to the horizontal line.

In the coin feeding device, the rotating disk for feeding out coins is inclined between about 60 degrees and below from the horizontal in order to feed coins stably.
Therefore, since the first coin sent out from the rotating disk has a posture of about 60 degrees from the horizontal, even if the ball of the second technology is placed at the first coin position in FIG. It is not possible to prevent the fall of the camera immediately, and there is a problem that a “cracking” sound is generated.

The first object of the present invention is to prevent the generation of noise by preventing the first coin sent out from the rotating disk from going backward.
The second object of the present invention is to provide a coin retrograde prevention device that can be easily retrofitted.
The third object of the present invention is to provide an inexpensive coin retrograde device.

In order to achieve this object, the invention of claim 1 is configured as follows.
In a coin delivery device in which coins are sent one by one along a guide surface to a guide device by a rotating disk, and the coins sent out by the guide device are aligned in a row and guided upward, An anti-reverse device that acts on the coin sent out from the rotating disk is provided adjacent to the anti-reverse device, the free end of which is located in the coin path of the coin sent out by the rotating disk, and the moving coin A coin retrograde prevention device comprising a one-way stopper movable so as to be removed from the coin passage .

In this configuration, the coins are sorted one by one by the rotating disk and sent to the guide device.
In the guide device, the coins are arranged in a line in contact with the peripheral surface, and the rear coins are guided upward by pushing the front coins and then paid out.
Then, the first coin that is fed out of the rotating disk and moves through the coin passage pushes the free end of the one-way stopper, which is the first anti-backward device, out of the coin passage .
When the first coin passes, the pushed free end returns to its original position by the biasing force and is positioned in the coin path.
As a result, when the coin that is no longer being pressed by the rotating disk moves backward, the coin moves slightly backward and is then locked to the tip of the one-way stopper to prevent movement toward the rotating disk.
In other words, since the coins sent out from the rotating disk cannot be greatly reversed, they do not collide with the rearward coins or the rotating disk.
The backward coins collide with the one-way stopper and emit a collision sound. However, since the backward distance of the coins is very small, the noise generated by the collision is extremely small.

According to a second aspect of the present invention, in the coin reverse prevention device of the coin feeding device according to the first aspect, the one-way stopper has a rod shape, and the free end is formed in a triangle having a top portion on the coin path side. The upstream side of the coin in the traveling direction is formed in an inclined portion that forms an acute angle with respect to the guide surface, and the downstream side of the coin in the traveling direction of the coin is formed in a vertical portion that is substantially perpendicular to the guide surface from the inclined portion, The free end is urged so as to advance into the coin passage, and the inclined portion receives a force that deviates from the coin passage by the moving coin .
In this configuration, the first coin moved by the rotating disk pushes the inclined portion and causes the rod-shaped one-way stopper to exit from the coin passage .
As a result, the first coin moves along the coin path, and passes by being pushed by the rotating disk to the side of the one- way stopper.
When the coin passes, the one-way stopper is returned to the original by the urging force , and the free end is positioned in the coin passage.
In this state, if the coin goes backward, it is immediately stopped by the free end of the one-way stopper, and the backward run is prevented.
Therefore, since the retrograde amount is extremely small, it is only necessary to make the rod-shaped one-way stopper moveable , in addition to the silencing effect of reducing the collision sound, so that there is an advantage that it can be achieved by a simple device and is inexpensive.

According to a third aspect of the present invention, in the coin reverse prevention device of the coin feeding device according to the second aspect, the vertical portion receives a force of the top portion directed toward the guide surface by the reverse coin. It is.
With this configuration, since the one-way stopper receives a force directed toward the guide surface by the coin that has gone backward in the coin passage, the tip of the one-way stopper is pressed against the guide surface, and the backward coin does not come off the one-way stopper.
Therefore, it is possible to reliably prevent the coin from going backward.

According to a fourth aspect of the present invention, in the coin reverse preventing device of the coin feeding device according to the second aspect, the one-way stopper has a rod shape, and one end portion on the rotating disk side is attached so as to be pivotable above the coin passage. The free end at the other end is biased toward the coin passage by a self-moment and has an inclined portion that receives a pushing force by the moving coin.
In this configuration, the first coin moved by the rotating disk pushes the inclined portion to pivot the rod-shaped one-way stopper.
As a result, the first coin moves along the coin path, and passes below the one-way stopper while being pushed by the rotating disk.
When the coin passes, the one-way stopper is returned to its original position by a moment due to its own weight, and the free end is positioned in the coin path.
In this state, if the coin goes backward, it is immediately stopped by the free end of the one-way stopper, and the backward run is prevented.
Therefore, since the retrograde amount is extremely small, in addition to the silencing effect of reducing the collision sound, it is only necessary to pivotally support the rod-shaped one-way stopper, so that there is an advantage that it can be achieved by a simple device and is inexpensive.

According to a fifth aspect of the present invention, there is provided a first rotating disk having a through hole in which a coin is dropped and an extruding portion that pushes the dropped coin, and a coin pushed out by the extruding portion of the rotating disk, and is rotated together. A coin feeding device having a second rotating disk that slides and a slide base that guides the dropped coin and the coin that is swung by the second rotating disk, and a free end of which is fed by the second rotating disk A one-way stopper which is located in the coin passage and is pivotable so as to be removed from the coin passage by the moving coin is disposed in the coin passage of the coin moved by the second rotating disk. It is a retrograde prevention device.
In this configuration, the coins are arranged in a line in contact with the peripheral surface, and the rear coins are guided upward by pushing the front coins and then paid out.
Then, the first coin sent out from the second rotating disk and moving in the coin path pushes up the free end of the one-way stopper.
When the first coin passes, the free end pushed up returns to its original position by the moment due to its own weight, and the tip of the one-way stopper is located in the coin passage of the coin.
As a result, when a coin that is no longer being pressed by the second rotating disk moves backward, the coin moves slightly backward and is then locked to the tip of the one-way stopper, thereby preventing movement toward the rotating disk.
In other words, since the coin sent out from the second rotating disk cannot be largely reversed, it collides with the rearward coin or the second rotating disk with a slight movement amount.
The backward coins collide with the tip of the one-way stopper and emit a collision sound. However, since the backward distance of the coins is small, the noise generated by the collision is extremely small.

According to a sixth aspect of the present invention, there is provided a rotating disk that feeds coins one by one along the guide surface to the guide device, a slide base that guides the sent coins, and a perforated cover that covers the outside of the rotating disk. In the coin feeding device, a one-way stopper supported on a pivot shaft so that a free end is positioned in a coin path of a coin fed out by the rotating disk and can be pivoted so as to be removed from the coin path by a moving coin And the pivot shaft is attached using the hole of the perforated cover.
In this configuration, the coins are arranged in a line on the slide base in contact with the peripheral surface, and the rear coins are guided upward by pushing the front coins and then paid out.
Then, the first coin that is fed from the rotating disk and moves in the coin passage pushes up the free end of the one-way stopper that can pivot about the pivot shaft.
When the first coin passes through the one-way stopper, the free end pushed up by the one-way stopper returns to its original position by the moment due to its own weight, and the tip of the one-way stopper pivots about the pivot shaft as a coin path. Located in.
As a result, when the coin that is no longer being pressed by the rotating disk moves backward, the coin moves slightly backward and is then locked to the tip of the one-way stopper to prevent movement toward the rotating disk.
In other words, since the coin sent out from the rotating disk cannot largely reverse, it collides with the rearward coin or the rotating disk with a small amount of movement.
The backward coins collide with the tip of the one-way stopper and emit a collision sound. However, since the backward distance of the coins is small, the noise generated by the collision is extremely small.
Further, the pivot shaft of the one-way stopper is attached using the hole of the perforated cover of the rotating disk.
Therefore, the one-way stopper has an advantage that it can be retrofitted to the perforated cover .

A rotating disk having a through hole through which a coin falls and a pushing part that pushes the dropped coin, a second rotating disk that receives and rotates the coin pushed out by the pushing part of the rotating disk, and the dropping In a coin feeding device having a slide base for guiding the coins and the coins rotated by the second rotating disk, and a perforated cover covering the outside of the second rotating disk, a free end is fed by the rotating disk. A coin coin that is positioned in the coin passage of the coin and is fed by the second rotating disk with a one-way stopper supported by a pivot shaft so as to be pivotable so as to be removed from the coin passage by the moving coin The pivot shaft is disposed using the hole of the perforated cover. The vignetting has a coin backstop characterized by.

FIG. 1 is a perspective view of an essential part of a coin feeding device equipped with a retrograde prevention device according to an embodiment of the present invention.
FIG. 2 is a plan view of the main part of the coin feeding device with the cover mounted with the retrograde prevention device of the embodiment of the present invention.
FIG. 3 is a cross-sectional view of the coin feeding device equipped with the anti-reverse device of the embodiment of the present invention cut along a plane parallel to the slide base and the guide plate removed.
FIG. 4 is an enlarged view of a mounting portion of the retrograde preventing device according to the embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along line AA in FIG.

The same parts as those in FIGS. 6 and 7 are denoted by the same reference numerals, and different configurations will be described.
The first sheet retrograde prevention device 100 will be described.
The first anti-reverse device 100 has a function of acting on the first coin 14 immediately after being sent out from the second rotary disk 20 and preventing the reverse to the second rotary disk 20 side.

The first retrograde device 100 is fixed above the guide plate 102 that defines the upper side of the coin passage 46.
Specifically, it is a box shape covering the second rotary disk 20 fixed to the slide base 26, and is attached to a perforated cover 108 having a plurality of holes 106 formed at predetermined positions on the upper plate 104.

The upper plate 104 of the perforated cover 108 is disposed substantially parallel to the slide base 26.
The perforated cover 108 is arranged as a safety measure for the second rotating disk 20, and the plurality of holes 106 are holes for monitoring the rotation status of the second rotating disk 20 and the coin 14 moving in the coin passage 46.

The first anti-reverse device 100 is a rod-shaped one-way stopper 110.
The one-way stopper 110 is formed by sheet metal processing into a cross-sectional channel shape, and is disposed above the coin passage 46 on the side of the second rotary disk 20.
An end portion of the one-way stopper 110 on the first rotating disk 18 side is attached to a pivot shaft 112 so as to be pivotable, and the other end portion is a free end 114.
The free end 114 is located in the coin passage 46 through the circular opening 115 of the plate 102.

The pivot shaft 112 is supported by a pair of left and right bearing plates 118 and 120 of a bearing 116 bent in a channel shape, and is attached in parallel to the guide surface 122 of the base 26.
Long holes 126 and 128 are formed at both ends of the mounting portion 124 extending in parallel with the base 26 from the upper portion of the bearing 116, and the fixing screws 130 and 132 pass therethrough.
The screws 130 and 132 are screwed into screw holes 134 and 136 formed in the upper plate 104, respectively, and are fixed.

The bearing 116 is attached using the hole 106 of the perforated cover 108.
In other words, the bearing plates 118 and 120 are inserted into the existing holes 106 formed in the upper plate 104, and the upper mounting portion 124 is fixed to the upper plate 104 by the screws 130 and 132.

Next, the detailed shape of the one-way stopper 110 will be described with reference to FIG.
The free end 114 of the one-way stopper 110 is an inclined portion 140 whose lower edge on the first rotating disk 18 side intersects the guide surface 122, which is the upper surface of the slide base 26, at an acute angle with respect to the advancing direction of the coin 14. .
A downstream end surface of the one-way stopper 110 is formed in a vertical portion 142 that is substantially perpendicular to the guide surface 122.
The inclined portion 140 and the vertical portion 142 are formed with a parallel portion 144 in line contact with the guide surface 122.

The one-way stopper 110 is rotatable with respect to the pivot shaft 112.
Therefore, in the normal state, the one-way stopper 110 is rotated counterclockwise in FIG. 5 by the self-moment due to its own weight, and is stationary with the parallel portion 144 in surface contact with the guide surface 122.
In this stationary state, the inclined portion 140 forms an acute angle with respect to the guide surface 122 as described above, and the vertical portion 142 forms a right angle with respect to the guide surface 122.

In addition, an urging means such as a spring can be added to the one-way stopper 110 so that the rotational force can be more positively applied.
Further, the one-way stopper 110 is pushed by the extruded body 30 of the second rotating disk 20 and the inclined portion 140 is pushed by the coin 14 being rotated.
As a result, a component force that is perpendicular to the guide surface 122 and upward is applied to the inclined portion 140, so that the one-way stopper 110 is rotated clockwise in FIG.

Therefore, the coin 14 to be pushed moves while being sandwiched between the guide surface 122 and the parallel portion 144 which is a part of the free end 114 of the one-way stopper 110.
When the coin 14 passes, the one-way stopper 110 rotates counterclockwise in FIG. 5 due to self-moment, and stops in a state where the parallel portion 144 is in contact with the guide surface 122.

Since the coin 14 pushed out by the pusher 30 is not supported by the pusher 30, the coin 14 slides down due to its own weight, but immediately collides with the vertical portion 142 of the one-way stopper 110 and stops at that position.
When the vertical portion 142 is pushed by the coin 14, the vertical portion 142 is offset with respect to the pivot shaft 112 of the one-way stopper 110, so that the one-way stopper 110 also moves toward the guide surface 122 by the pushing force of the coin 14. Occurs.

Therefore, even if the reverse coin 14 is pressed with a large force, the one-way stopper 110 is not detached from the coin 14, and the reverse motion is reliably prevented.
Furthermore, in the embodiment, in a state where the coin 14 is stopped by the vertical portion 142 of the one-way stopper 110, the coin 14 is surrounded and held by the guide surface 122, the guide plate 102, the guide surface 32, and the second rotating disk 20. Therefore, the one-way stopper 110 does not come off and the coin 14 is prevented from going backward.

When the succeeding coin 14 is pushed by the second rotary disk 20, the coin 14 stopped by the one-way stopper 110 is pushed by the coin 14, so that the coin 14 passes through the gate device 34 and moves to the coin guide device 22. Is done.
Even if the disk 14 moves backward against the reverse blocking force of the gate device 34 due to the weight of the disk 14 in the guide device 22, the distance until the backward movement is blocked by the one-way stopper 110 is small. The impact of time is small.
Therefore, the generation of noise due to the backward movement of the coin 14 is extremely small.

Reference numeral 146 is an agitator that is attached to the rotating shaft of the second rotating disk 20, has a tip projecting into the bowl 16 and agitates the coins in the bowl 16 and prevents the coins from jamming. Also good.
The position of the vertical portion 142 of the one-way stopper 110 can be adjusted in the range of the long holes 126 and 128 of the mounting portion 124.
That is, by adjusting the position of the vertical portion 142 in accordance with the diameter of the coin 14 so that the reverse amount of the coin 14 is minimized, the generated noise can be minimized.

The present invention can also be applied to a feeding device that does not include the second rotating disk 20 and sends out the coin 14 using only the first rotating disk 18.
Further, the gate device 34 may not be provided.

FIG. 1 is a perspective view of an essential part of a coin feeding device equipped with a retrograde prevention device according to an embodiment of the present invention. FIG. 2 is a plan view of the main part of the coin feeding device with the cover mounted with the anti-reverse device of the embodiment of the present invention. FIG. 3 is a cross-sectional view of the coin feeding device equipped with the anti-reverse device of the embodiment of the present invention cut along a plane parallel to the slide base and the guide plate removed. FIG. 4 is an enlarged view of a mounting portion of the retrograde prevention device according to the embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line AA in FIG. FIG. 6 is an overall perspective view (partially exploded view) of a conventional coin delivery device. FIG. 7 is an explanatory diagram of the operation of the conventional apparatus.

Explanation of symbols

14 coins
18 First rotating disc
20 Second rotating disc
22 Guide device
26 Slide base
46 Coin passage
100 Anti-reverse device
108 Perforated hippo
106 holes
110 One-way stopper
112 Pivot shaft
114 Free end
140 Slope

Claims (6)

The coins (14) are sent to the guide device (22) one by one along the guide surface (122 ) by the rotating disks ( 18, 20 ), and the coins (14) sent out by the guide device (22) are arranged in a row. In the coin feeding device arranged to be guided in the upward direction,
Providing an anti-reverse device (100) that acts on the coin (14) fed from the rotating disk (20) adjacent to the rotating disk (20),
The anti-reverse device includes a one-way stopper (110) that has a free end (114) positioned in a coin passage (46) of a coin fed out by the rotating disk and is removed from the coin passage by a moving coin. ). A coin retrograde prevention device characterized by comprising: 2. The coin retrograde device of the coin feeding device according to claim 1, wherein the one-way stopper has a rod shape, and the free end is formed in a triangle whose top is the coin passage side, and the upstream side of the triangular coin in the traveling direction is Formed in an inclined portion (140) that forms an acute angle with respect to the guide surface, and is formed in a vertical portion (142) that forms a substantially right angle to the guide surface on the downstream side of the inclined portion with respect to the guide surface. An anti-coin retrograde device characterized in that an end is biased so as to advance into the coin passage, and the inclined portion receives a force to be removed from the coin passage by a moving coin. 3. The coin retrograde apparatus according to claim 2, wherein the vertical portion receives a force of the top portion toward the guide surface by the retrograde coin. 2. The coin retrograde device of the coin feeding device according to claim 1, wherein the one-way stopper is in a rod shape, and one end portion on the rotating disk side is pivotably attached above the coin passage, and the other end is a free end. Has an inclined portion (140) that is urged toward the coin passage by a self-moment and receives a pushing force by a moving coin. A first rotating disk (18) having a through hole (24) for dropping the coin (14) and an extruding portion for pushing the dropped coin;
A second rotating disk (20) for receiving and rotating coins pushed out by the pushing portion of the rotating disk;
A coin feeding device having a slide base (26) for guiding the dropped coin and the coin rotated by the second rotating disk;
A one-way stopper (110) that has a free end (114) located in the coin path (46) of the coin fed out by the second rotating disk and is pivotable so as to be removed from the coin path by the moving coin. A coin retrograde device, wherein the coin retrograde apparatus is disposed in a coin path of a coin moved by the second rotating disk. Rotating disks (18, 20) for feeding coins (14) along the guide surface (122) one by one to the guide device (22),
A slide base (26) for guiding the coins sent out;
In the coin feeding device having a perforated cover (108) covering the outside of the rotating disk,
A free end (114) is located in the coin passage (46) of the coin sent out by the rotating disk, and is pivotable to the pivot shaft (112) so as to be pivotable to be removed from the coin passage by the moving coin. A coin retrograde prevention device, wherein a supported one-way stopper (110) is provided, and the pivot shaft is attached using a hole (106) of the perforated cover.