KR100909343B1 - Dehydrator of food waste for sink - Google Patents

Abstract

A food waste dehydrator of a sink is provided to reduce manufacturing cost with simple structure and to dehydrate food waste by using the centrifugal force. A food waste dehydrator(1) of a sink is installed in a drain tank(3) of a sink by rotatably putting an upper flange is put on a support(4) formed in the entrance circumference of the drain tank. The food waste dehydrator of the sink is composed of a filter container(20), a rotary cover plate(30) which is rotated with the filter container and has one or more insertion holes, a rotary bar(40) applying the centrifugal force to the food waste, and a ring member(10) rotated with the filter container by the rotation of the rotary cover plate.

Description

Dehydrator of Food Waste for Sink

The present invention relates to a food waste dehydration device, and more particularly, to a food waste dehydration device for a simple sink that can dehydrate water from wet food waste collected by being attached to a sink of a sink.

Food waste generated during the cooking process, such as leachate, is generated when it is landfilled, causing soil and water pollution, and incineration with general waste causes dioxin to be released into the atmosphere. There is a separate collection and disposal policy.

Under these circumstances, in general households, food wastes collected in the manure bucket mounted on the drain box of the sink are collected in a plastic container with a lid, and then collected in a food waste bag or a shared food waste container.

However, cleaning the wet food waste in the sink manure is one of the most unpleasant things to do in kitchen work, because cleaning up the food waste in the sink is unpleasant, smells, and can cause water to fall on the floor during transfer. Often, rather than cleaning the drain and manure, the food waste is often collected after a certain amount of gathering, which in turn leads to poor indoor environment such as bad smell and hygiene, as well as the leakage of food waste through the manure. The inflow into the sewer may cause clogging of the sewer pipe.

As a way to reduce the discomfort associated with the treatment of wet food waste in the sink, it is convenient to remove the water to some extent prior to emptying the food waste of the manure bucket so that the food waste in the manure can be immediately emptied. Sink dewatering devices have been developed and used.

As an example of such a sink dehydration device, the Republic of Korea Patent No. 10-0704459 (announced on April 11, 2007) 'Sink substitute food waste dehydrator', Republic of Korea Registered Utility Model No. 20-0152483 (Aug. 15, 1999) Korea's Utility Model No. 20-0273242 (December 22, 2002), 'Drainage Dewatering Device for Sinks', Korea Utility Model No. 20- Republic of Korea Registered Utility Model No. 20-0308516 of the Korea Utility Model No. 20-0308516 (Notice of Food Waste Dewatering System for Korea) Detachable food waste dewatering device of Shinan No. 20-0383594 (announced on May 06, 2005) is included.

However, the conventional dehydration device, a high-power motor built into the sink in the case of the electric, and using a complex gear in the case of the manual, there is a high manufacturing cost problem.

There are many food waste dehydrators that can be used independently of the sink, but are also used with high-power motors or gears.

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple food sink dewatering device for a simple sink that can be dehydrated by centrifugal force by simply attaching it to a sink of a sink in order to dehydrate food waste that is filtered out of a filter basin of a sink. It is.

An object of the present invention is to provide a food waste dehydration device for a sink that can be easily manufactured by simple configuration and low operating cost and can be easily mounted on a drain box of a sink in a general home.

According to the present invention, a food waste dehydration apparatus for a sink is provided.

Food waste dewatering device for a sink according to the present invention, basically, comprises a mandrel, a rotating cover plate and a swivel.

The filter box is accommodated in a drain box formed in the sink, the upper flange is rotatably mounted on the support end formed around the inlet of the drain box, food waste is collected by filtering.

The rotary cover plate is mounted on the filter barrel to cover the upper portion of the filter barrel, rotate integrally with the filter barrel, at least one insertion hole is perforated.

The swivel is inserted into the insertion hole of the rotary cover plate to rotate the rotary cover plate, the centrifugal force to the food waste accommodated in the manure container by the rotation of the filter barrel rotates integrally in accordance with the rotation of the rotary cover plate Generate.

Preferably, between the support end of the sump and the flange of the mandrel is rotatably mounted on the support end, the flange of the mandrel is over it, the manure barrel in accordance with the rotation of the rotary cover plate It further comprises a ring member which rotates integrally with the.

Preferably, at least one side of the contact surface of the support end, the flange and the ring member is formed with a convex portion or irregularities.

Preferably, the apparatus further includes a first shaft-shaft hole formed in a center between the trap and the mandrel installed in the drain hole of the drain box, and rotatably fitted to each other to provide a center of rotation shaft.

Preferably, a bearing plate interposed between the trap and the mandrel installed in the drain of the sump, the first shaft-shaft ball formed in the center between the mandrel and the bearing plate to be rotatably interlocked to provide a center of rotation axis, the And a second shaft-axis hole formed at a center between the bearing plate and the trap so as to be rotatably fitted to each other to provide a center of rotation shaft, and a rotation guide formed at the trap at a position corresponding to the circumference of the bearing plate.

Preferably, the insertion hole of the rotary cover plate is at least one eccentric insertion hole perforated off the center of the rotary cover plate, the swivel is inserted into the eccentric insertion hole is a straight type to manually rotate the rotary cover plate It is a manual swivel.

Preferably, the insertion hole of the rotary cover plate is a center insertion hole located in the center of the rotary cover plate, the swivel is a manual swivel to manually rotate the rotary cover plate by inserting the center insertion hole; The manual swivel may be inserted into the central insertion hole, a transverse rod extending laterally from the insertion protrusion, a longitudinal rod extending upward from the lateral rod, and freely rotatably inserted into the insertion protrusion or the longitudinal rod. Included handles.

Preferably, the insertion hole of the rotary cover plate is a center insertion hole located in the center of the rotary cover plate, the swivel is an electric swivel to rotate the rotary cover plate by inserting into the center insertion hole; The electric swivel includes an insertion protrusion inserted into the center insertion hole, a motor for rotating the insertion protrusion, a housing in which the motor is rotatably mounted, and a switch for turning on and off the motor.

The food waste dewatering device for a sink according to the present invention can be easily installed at the sink of the sink and rotated by a manual or electric drive to remove moisture from the food waste by centrifugal force, but its structure is simple and inexpensive. It can be easily used as a simple transplant in a general home.

Hereinafter, with reference to the accompanying drawings will be described in more detail the food waste dehydration device for a sink according to the present invention. The following embodiments are merely illustrative of the dewatering device according to the present invention, but are not intended to limit the scope of the present invention.

According to the present invention, a food waste dehydration apparatus 1 for a sink is provided.

Food waste dewatering device 1 for a sink according to the present invention, basically comprises a strainer 20, the rotary cover plate 30 and the rotary table 40, preferably further comprises a ring member 10, FIG. As shown in FIG. 1 and FIG. 2, generally, the bottom surface of the sink 2 is detachably installed in the drain container 3 formed in the shape of a cylinder.

The ring member 10 optionally applied is shown in FIGS. 3, 4, and 5. As shown in FIG. 7, a circular ring-shaped center-penetrated and rim only mounted to the sump 3 and rotatably mounted on the support end 4 formed around the inlet of the sump 3. It is absent.

In general, the upper edge of the conventional drain (3) of the sink (2) of the sink (2) is commercially available, and the stepped support step (4) to cover the stopper for drip and / or odor blocking if necessary ) Is formed, the dehydration device (1) of the present invention when applied to the existing sink (2) is mounted using this support stage (4), suitable for applying the dewatering device (1) of the present invention In the case of newly designing the sink, a supporting stage 4 suitable for the present invention is formed, and the dehydrating device 1 of the present invention is mounted thereto.

Since the ring member 10 is rotated in contact with the support end 4, the contact surface of both members is to be as low as possible frictional resistance to the rotation of the ring member 10 relative to the support end (4), In the rotation process, it is preferable that the ring member 10 is prevented from being unintentionally released from the support end 4 by rocking.

In general, the dewatering device (1) of the present invention is used in an environment that is wet with water and the scale to some extent, so that the friction force is not large, so that the ring member 10 and the support end 4, which are made of plastic synthetic resin, etc. Rotation of the ring member 10 with respect to the support end 4 or rotation of the flange 21 of the manure 20 which will be described later with respect to the support end 4 even in the state of contact with the face-to-face without applying the structure of It is sufficient to achieve the object of the invention, and furthermore, the ring member 10 and the flange 21 are constrained by the vertical wall 4a of the supporting end 4 so that the swing and unintentional disengagement during rotation are possible. Although this is prevented, it is possible to add a structure that is as low as possible in frictional resistance and more reliably prevents departure.

The embodiments illustrated in FIGS. 3 to 7 form a flexible curved concave-convex 11 on the contact surface of the supporting end 4 and the ring member 10 or the flange 21 so as to be naturally fitted or raised to each other. Rotation is made smooth and the rocking | deviation (deviation) of the ring member 10 and the strainer 20 is prevented.

FIG. 4 is an example in which the corrugated convex portion 11a and the concave portion 11b are formed in the ring member 10, and the corrugated concave portion 11b and the convex portion 11a are formed in the support end 4, and FIG. The convex part 11a is formed in the member 10, and the recessed part 11b is formed in the support end 4, and FIG. 6 forms a convex part only in the support end 4, and the flange 21 which is the other side has no recessed part As an example formed from the surface, the formation position of the recess 11 and its structure can be variously modified according to the present invention.

When the dehydration apparatus 1 of the present invention is applied to the existing sink 2, when the unevenness 11 is not formed in the supporting end 4, as shown in FIG. 5, the supporting end 4 and Between the ring members 10, it is also possible to additionally attach a separate concave-convex ring 13, the concave-convex 11 is formed.

Concave-convex 11 and the concave-convex ring 13 is applied to the present invention to smoothly rotate, but the convex portion 11a may be in contact with the concave portion 11b or the surface, causing frictional forces, In order to reduce the frictional resistance as much as possible, the frictional area with the recessed portion 11b or the surface may be reduced by forming the convex portion 11a at regular intervals without forming the entire circumference.

The filter box 20 is inserted through the ring member 10 is mounted in a state accommodated in the drain box 3, the upper surface is open to form an inlet, the circumference and the bottom is a cylindrical filter container of the mesh formed with a drain hole As, when food waste occurs in the process of using the sink (2), the food waste is filtered out and only water is allowed to escape.

A flange 21 is formed on the upper side of the filter box 20, and the filter box 20 is rotated together with the ring member 10 in a state where the flange 21 is mounted on the ring member 10.

Since the strainer 20 has to be rotated at a considerable speed in the drain 3, for example, it is preferable to form a rigid material such as stainless steel in which the drain hole is drilled into a mesh rather than a flexible material.

In the absence of the ring member 10, the flange 21 of the sieve 20 is rotatably mounted directly on the supporting end (4). Even in the embodiment including the ring member 10, the ring member 10 and the strainer 20 can be formed integrally without forming a separate separate body.

In accordance with a feature of the present invention, the filter box 20 should rotate integrally with the ring member 10, so in the example in which the filter box 20 is formed separately from the ring member 10, the filter box 20 has a ring member ( Of course, it should not be rotated integrally with 10) and do not turn the wheel.

3 and 4 are grooves in which the protrusions 12 are formed on the inner circumferential surface of the ring member 10 at regular intervals and the protrusions 12 are fitted to the outer circumferential surface of the manure tube 20 at a corresponding position. As the 22 is formed, when the ring member 10 is rotated by the combination of the protrusion 12 and the recess 22, the filter box 20 is also rotated together. Of course, it is also possible to form the projections 12 and the recesses 22 in the ring member 10 and the mantle 20 in the reverse direction, it is also possible to rotate integrally by another structure.

The dewatering device 1 according to the present invention may further include a structure that allows the rotating manure 20 to rotate smoothly without shaking.

As an example, as shown in FIGS. 4 and 7, the first shaft-axis hole 60 may be formed between the trap 50 and the filter box 20 installed in the drain port 5 of the drain box 3. Can be. The first shaft-axis hole 60 is formed in the center between the bottom surface of the mandrel 20 and the top surface of the trap 50 and is rotatably fitted to provide a center of rotation.

In the present embodiment, the shaft hole 61 is formed in the center of the bottom surface of the mandrel 20, and the shaft 62 is protruded from the upper surface of the trap 50 at the corresponding position so as to be rotatably inserted into the shaft hole 61. As a matter of course, the formation positions of the shaft hole 61 and the shaft 62 with respect to the strainer 20 and the trap 50 can be reversed.

According to such a structure, the filter box 20 is rotated around the axis of rotation of the first shaft-axis hole 60 in a state constrained by the first shaft-axis hole 60, so that the strainer 20 is out of position. It is possible to prevent the shaking of the.

As another example, as shown in FIG. 6, the trap 50 installed in the drain 5 of the drain container 3, the bearing plate 70 interposed between the filter container 20 and the trap 50, the filter container A first shaft-shaft hole 60 formed at the center between the bearing plate 70 and the bearing plate 70 so as to be freely rotatably provided to provide a center of rotation shaft, and formed at the center between the bearing plate 70 and the trap 50. And a second shaft-shaft bore 80, which is freely rotatably fitted to provide a center of rotation shaft, and a rotation guide 90 formed around the bearing plate 70 and in a trap 50 at a position corresponding thereto. Can be configured to

In this embodiment, the shaft hole 61 in the center of the bottom face of the strainer 20, the shaft 62 in the center of the upper surface of the bearing plate 70, and the shaft hole 81 in the center of the bottom surface of the bearing plate 70, The shaft 82 is formed on the upper surface of the trap 50, and the shaft hole 61 and the shaft 62, and the shaft hole 81 and the shaft 82 are rotatably inserted, and the outer periphery of the bearing plate 70 A downward guide 91 may be formed and an upward guide 92 may be formed on the upper surface of the trap 50 to the inner side of the downward guide 91 so that the upward guide 92 may rotate on the downward guide 91 at a slight interval. Is fitted.

According to the addition of such a structure, the filter barrel 20 is constrained by the first shaft-axis ball 60 and the second shaft-axis ball 80 and the first shaft-axis ball 60 and the second shaft-axis ball. Since the rotation is rotated about the center of the rotation shaft 80 and the rotation guide 90 is guided to the home position, it is possible to further prevent the shake box 20 from moving out of the home position.

The trap 50, the bearing plate 70, and the first shaft-axis hole 60 and the second shaft-axis hole 80, together with the supporting end 4, also function to rotatably support the filter barrel 20. do.

The rotary cover plate 30 is mounted on the manure 20 to cover the upper portion of the manure 20, and rotates together with the manure 20 and the ring member 10, at least one insertion hole (31) This is a perforated plate-like member. The rotary cover plate 30 may also cover the open inlet of the filter box 20 to prevent water or food waste from splashing out during dehydration.

The dewatering device 1 according to the present invention, by rotating the rotary cover plate 30 manually or by electric motor, optionally with the rotary cover plate 30 via the ring member 10 or directly through the strainer 20 It is an apparatus which dewaters by food centrifugal force from the food waste of the filter container 20 by making it rotate integrally.

The integral rotation structure of the rotary cover plate 30 and the mantle 20 is not particularly limited, as shown in Figure 3 and the like, by forming a groove 32 on the outer periphery of the rotary cover plate 30 ring member ( When the rotary cover plate 30 is rotated by the combination of the protrusion 12 of 10), the ring member 10 may rotate together, and as a result, the filter box 20 may also rotate together. Of course, it is also possible to reverse the projection 12 and the groove 32 of the rotary cover plate 30 and the ring member 10.

As an example of the unitary rotation structure in the absence of the ring member 10, as illustrated in FIG. 6, a hole 21a is drilled in the flange 21 of the mandrel 20 and a bending protrusion is formed in the rotary cover plate 30. 33 is formed so that the bending protrusions 33 are inserted and restrained in the holes 21a, so that the filter tube 20 can be rotated integrally with the rotary cover plate 30.

The insertion hole 31 formed in the rotary cover plate 30 is a hole for inserting the swivel table 40 to rotate the rotary cover plate 30, and the insertion hole 31 of the rotary cover plate 30 is formed. The position is formed in an appropriate shape at an appropriate position according to the type of the rotary table 40, the operation will be described together with the following description of the rotary table 40.

The swivel table 40 is inserted into the insertion hole 31 of the rotary cover plate 30 and rotated to rotate the filter barrel 20 through the rotation of the rotary cover plate 30 and optionally the ring member 10. It is a member that causes centrifugal force to occur. The rotary table 40 is not particularly limited as long as the rotary cover plate 30 is rotated by rotating in the state inserted into the insertion hole 31 of the rotary cover plate 30.

As an example of the rotary table 40, the embodiment of Figure 5, the insertion hole 31 of the rotary cover plate 30 is at least one eccentric insertion hole 31a drilled away from the center of the rotary cover plate 30 , The rotary table 40 is a case of the linear manual rotary table 40a to be inserted into the eccentric insertion hole (31a) to manually rotate the rotary cover plate 30.

In this embodiment, the manual turntable 40a may use an elongated straight rod such as, for example, a plastic rod or chopsticks, and the eccentric insertion hole 31a may be at least one position away from the center of the rotary cover plate 30. Since a plurality of perforations are inserted into the eccentric insertion hole (31a) of the manual rotary table (40a) by turning in a circle by hand, the rotary cover plate 30 is rotated.

3, 4 and 6 of another embodiment, the insertion hole 31 of the rotary cover plate 30 is a central insertion hole 31b located in the center of the rotary cover plate 30, the rotary table ( 40 is a case of the manual swivel table 40b which is inserted into the center insertion hole 31b to manually rotate the rotary cover plate 30.

In the present embodiment, the manual turntable 40b extends upwardly from the insertion protrusion 41 inserted into the center insertion hole 31b, the transverse rod 42 extending laterally from the insertion protrusion 41, and the transverse rod 42. Longitudinal rod 43, and a rotary knob 44 freely rotatably inserted into the longitudinal rod 43. At this time, the center insertion hole 31b and the insertion protrusion 41 are formed in a polygon or oval shape whose cross-sectional shape fits tightly so that the insertion protrusion 41 does not turn around in the center insertion hole 31b.

This manual swivel 40b can be formed in various ways, Figure 3 is an example of the short formation of the insertion projection 41, the handle 44 is turned to a circular rod while holding the handle 44 to the longitudinal rod 43 Is rotated with respect to the rotation cover plate 30 is an example of the rotation by the insertion protrusion 41 is rotated.

6 is an example in which the insertion protrusion 41 is elongated and the rotatable gripper 41a is mounted around the gripper 41a. The gripper 41a is held by one hand and the handle 44 is held by the other hand. When the 44 is rotated in a circular shape, the handle 44 is rotated with respect to the longitudinal rod 43 and the insertion protrusion 41 is rotated with respect to the gripper 41a, so that the rotary cover plate 30 is an example.

In another embodiment of Figure 7, which is another embodiment, the insertion hole 31 of the rotary cover plate 30 is the center insertion hole 31b located in the center of the rotary cover plate 30 as described above, the rotary table 40 Denotes a case where an electric swivel table 40c is inserted into the center insertion hole 31b and rotates the rotary cover plate 30 electrically.

In the illustrated rotary swivel 40c, the insertion protrusion 45 inserted into the center insertion hole 31b, the small AC or rechargeable DC motor 46 for rotating the insertion protrusion 45, and the motor 46 are rotatable. And a switch 48 for turning the motor 47 on and off.

According to the present embodiment, when the motor 46 is operated while the insertion protrusion 45 is inserted into the center insertion hole 31b, the rotary cover plate 30 is constrained thereto by the rotation of the insertion protrusion 45. The filter box 20 rotates.

When the dehydration apparatus 1 of the present invention is not used for dehydration of food waste, the rotary cover plate 30 may also serve as a filter plate through which water is dropped into the insertion hole 31 and the food waste is filtered out.

The food waste dewatering device 1 for a sink according to the present invention as described above can be easily disposed in a sink of a sink without using a motor or a complicated gear mounted on the sink as in the conventional sink-mounted dewatering devices. Equipped with manual or small motors, it can dehydrate water from food waste collected in the manure tank by centrifugal force, and its configuration is very simple, so it can be manufactured at low cost and it also saves operating costs such as electricity. For example, it would be easy to use as a simple transplant for the general family.

Although the dehydration apparatus of the present invention does not completely remove moisture from food waste by using manual or small electric motors without using a high-power motor, water droplets are collected when moving the food waste collected in the manure tank to the container. You can dehydrate enough to prevent it from falling.

1 is a schematic view of a sink to which the present invention is applied;

2 is a perspective view of an exemplary dewatering device according to the present invention;

3 is an exploded perspective view of an exemplary dehydration apparatus according to the present invention;

4 is a partially cutaway perspective view of an exemplary dewatering device according to the present invention;

5 is a cross-sectional view of another exemplary dewatering device according to the present invention;

6 is a cross-sectional view of another exemplary dewatering device according to the present invention;

7 is a cross-sectional view of another exemplary dewatering device according to the present invention;

<Explanation of symbols for the main parts of the drawings>

1: Dehydration apparatus of the present invention 2: sink 3: drain box

4: base 10: ring member 11: irregularities

11a: convex part 11b: main part 12: protrusion

13: uneven ring 20: strainer 21: flange

22: groove 30: rotating cover plate

31, 31a, 31b: insertion hole 32: groove 33: bending protrusion

40, 40a, 40b, 40c: Swivels 41, 45: Insertion protrusions 42: Lateral rods

43: longitudinal rod 44: handle 46: motor

47: housing 48: switch 50: trap

60: first shaft-axis hole 70: bearing plate 80: second shaft-axis hole

90: rotation guide

Claims (8)

It is accommodated in the drain container 3 formed in the sink 2, the flange 21 of the upper side is rotatably mounted on the support end 4 formed around the inlet of the drain container 3, the food waste inside Filtering sieve 20 to collect; A rotary cover plate 30 mounted on the filter barrel 20 to cover an upper portion of the filter barrel 20, rotating integrally with the filter barrel 20, and having at least one insertion hole 31 perforated therein; And Rotation of the filter barrel 20 is inserted into the insertion hole 31 of the rotary cover plate 30 to rotate the rotary cover plate 30, integrally rotated in accordance with the rotation of the rotary cover plate 30. Rotating table 40 for generating a centrifugal force to the food waste accommodated in the filter box 20 by; Characterized in that it comprises a sink, food waste dehydration device. 2. The manure tank according to claim 1, wherein the mandrel is rotatably mounted on the support end 4 between the support end 4 of the sump 3 and the flange 21 of the manure 20. The flange 21 of the (20) is over it, characterized in that it further comprises a ring member 10 which rotates integrally with the filter box 20 in accordance with the rotation of the rotary cover plate (30) , Food waste dehydrator for sink. The convex part 11a or the unevenness | corrugation 11 is formed in at least one side of the contact surface of the said support end 4, the said flange 21, and the said ring-shaped material 10, The said 11 or 2 characterized by the above-mentioned. Food waste dehydration device for the sink. According to claim 1 or 2, formed in the center between the trap 50 and the manure 20, which is installed in the drain (5) of the sump (3) is fitted to be rotatable mutually to provide a center of rotation axis It characterized in that it further comprises a first shaft-axis hole (60), food waste dehydration device for the sink. The method of claim 1 or 2, wherein the bearing plate 70, the manure 20, which is interposed between the trap (50) and the manure 20 is provided in the drain (5) of the sump (3) A first shaft-axis hole 60 formed at a center between the bearing plates 70 and rotatably fitted to each other to provide a center of rotation shaft, and formed at a center between the bearing plate 70 and the trap 50 to mutually rotate And a rotation guide 90 formed in the trap 50 at a position corresponding to the circumference of the bearing plate 70 and the bearing plate 70. Food waste dehydration device for the sink. According to claim 1 or 2, wherein the insertion hole 31 of the rotary cover plate 30 is at least one eccentric insertion hole (31a) perforated away from the center of the rotary cover plate 30, Swivel table 40 is inserted into the eccentric insertion hole (31a), characterized in that the straight manual rotary table (40a) for manually rotating the rotary cover plate 30, sink plant waste dewatering device. According to claim 1 or 2, The insertion hole 31 of the rotary cover plate 30 is a central insertion hole 31b located in the center of the rotary cover plate 30, The rotating table 40 is A manual swivel table (40b) inserted into the center insertion hole (31b) to manually rotate the rotary cover plate (30); The manual swivel 40b is inserted into the center insertion hole 31b, the insertion protrusion 41, the transverse rod 42 extending laterally from the insertion protrusion 41, and the lateral rod 42 upwards. Elongated longitudinal rod (43), and characterized in that it comprises a handle (44) rotatably inserted in the longitudinal rod 43, sink food waste dehydration device. According to claim 1 or 2, The insertion hole 31 of the rotary cover plate 30 is a central insertion hole 31b located in the center of the rotary cover plate 30, The rotating table 40 is An electric swivel table (40c) inserted into the center insertion hole (31b) to rotate the rotary cover plate (30) electrically; The electric swivel 40c, the insertion projection 45 is inserted into the center insertion hole 31b, the motor 46 for rotating the insertion projection 45, the housing in which the motor 46 is rotatably mounted And a switch (48) for turning on and off the motor (46).

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