JP2002345567A - Motor-driven hoisting/lowering rack apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that conventional rack apparatus in which hoisting and lowering of a rack body is performed by driving force of a motor, impact caused by a sudden stop when a rack is housed into a storing shelf, etc., is large. SOLUTION: A rack body 5 is fitted on the rotating end part of a main arm 16 supported on a rotating shaft 13, so that the rack body 5 can be moved between a housing position where it is housed on a high storing shelf 3 and a taking-out position where it is taken down to this side downward and the rotating shaft 13 is rotated by means of a driving mechanism 30 with a motor 40. Speed of this rotation is made slower when the rack body 5 comes to a position just before housing. For this purpose, a magnetic switch 53 for detecting that the rack body 5 comes to the position just before housing, a transformer T for taking out a 12-volt power source and an 8-volt power source and a relay RX2 for switching two kinds of these power sources and feeding it to the motor 40 are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric lifting rack device. Specifically, a rack main body is provided which is moved between a storage position stored in a predetermined storage portion and a take-out position lowered below the storage portion, and the rack main body is moved up and down by a driving force of a motor. The present invention relates to an elevating rack apparatus of a type that performs a lifting operation.

[0002]

2. Description of the Related Art For example, among lift rack devices which can be freely inserted into and removed from a high storage shelf in a kitchen, there is an electric rack device which raises and lowers a rack body by a driving force of a motor. This type of rack apparatus has a great advantage that since the rack is moved up and down mechanically, it can be easily operated even by a person with weak arm strength, regardless of the storage amount.

[0003]

However, the fact that the rack is moved up and down mechanically means that the lifting speed cannot be selected, so if the rack contains a fragile object such as a bottle, When the rack is stored vigorously in a storage shelf or the like, there is a possibility that the bottle or the like may be broken by the impact of a sudden stop. The impact at the time of stopping can be reduced by lowering the elevating speed, but this causes another problem that it takes time to elevate the rack body.

[0004] In particular, many of the conventional electric lifting and lowering rack devices have a structure in which the rack main body is vertically moved up and down linearly by winding and unwinding a belt hanging the rack main body. There is a problem that the articles stored in the main body tend to bounce to some extent due to the impact of the stop, and liquid or the like in a container without a lid spills. Further, the conventional lifting rack apparatus has a problem in that since there is little common structure between the manual operation type and the electric type, the dedicated rack is inevitably used and the cost is high.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to reduce the impact at least when the rack body is stored without substantially increasing the elevating time of the rack body. It is an object of the present invention to provide a new electric lifting / lowering rack device that does not cause the object to jump. Another object of the present invention is to provide a motor-operated lifting rack apparatus which can be easily used as a manually operated lifting rack apparatus.

[0006]

In order to achieve this object, an electric lifting and lowering rack apparatus according to claim 1 is provided with a storage position stored in a storage section such as a high-level storage shelf and a storage position of the storage section. A rack main body which is moved between an unloading position which is lowered forward and downward, a rotation arm having a base end rotatably supported by a base portion and the rack main body attached to a rotation end portion, and a motor A drive mechanism for rotating the rotary arm with the drive source as a drive source, detection means for detecting the position of the rack body, a control circuit for controlling the drive mechanism in accordance with a control signal including a signal from the detection means, When the rack body moves toward the storage position, a shift means for reducing the rotation speed of the rotation arm from a position slightly before storage of the rack body is completed is provided.

Therefore, according to this electric lifting and lowering rack apparatus, at least when the rack body is moved toward the storage position, the rotation speed of the rotation arm is reduced at least before the rack body is completely stored. Therefore, the impact when the storage of the rack main body is completed can be reduced, and thereby the thing in the rack main body can be almost certainly prevented from being broken or collapsed. Also, as a means for taking the timing to reduce the speed, for example, there is no way to measure the time until the rack body reaches a position slightly before the storage position from the removal position to the storage position with a timer and perform timed control, In the present invention, since the position of the rack body itself is detected by the detecting means and its timing is taken, there is no room for the timing of reducing the speed to be out of order, and reliable control can be guaranteed.

In the present invention, the time required to reduce the rotation speed of the rotation arm is only a little time from a position slightly before the storage of the rack body is completed. It will not be long. In the present invention, the rack body is moved by the rotation of the rotation arm, so that the rack body moves almost horizontally when the storage is completed. Since there is no upward movement, objects stored in the rack body do not jump upward.

Although various detection means can be used in the present invention, the rack body is repeatedly moved up and down every day. Particularly, when the rack body is installed in a kitchen or the like, the rack body easily becomes dirty with steam or oil. Non-contact switches, such as magnetic switches and optical switches, are more desirable than those involving mechanical operations. As the speed change means in the present invention, a method of switching the rotation speed of the motor or a method of switching the rotation speed by inserting a rocking gear into the rotation transmission system of the motor can be considered. In this case, the transmission can be configured simply by incorporating switches such as a power transformer and a relay into the control circuit, so that the structure can be simplified.

According to a second aspect of the present invention, there is provided an electric lifting and lowering rack apparatus according to the first aspect, further comprising a rotary shaft extending horizontally near a bottom surface of the storage section. Is characterized in that the base end of the rotating arm is fixed and a driven gear is attached, and the driven gear is rotated by a gear rotated by a motor.

[0011] For example, a lifting rack provided in a kitchen is very heavy, so it is important that the axis of the rotating arm be a double-supported form in which both ends are supported. The same applies to the case where this type of elevating rack apparatus is manually operated by manually raising and lowering the same, and a shaft similar to the rotating shaft is often required. Therefore, aside from whether or not the rotating arm is fixed to the shaft as in the present invention, the mechanical structure of such a shaft, the rotating arm supported by the shaft, and the rack body is manually adjusted. The operation type lifting device can be used in common with the electric lifting device. That is, since the mechanical basic configuration of the lifting rack device is satisfied by the rack main body, the shaft, and the arms supported by the rack body, if the rotation arm is provided with a damping device such as a damper, it becomes a manual operation type. This is because, if a drive mechanism for rotating the shaft is provided, it becomes electrically driven.

According to a third aspect of the present invention, there is provided an electric lifting rack apparatus, wherein the driving mechanism comprises a rack main body which has reached a storage position on the upper surface of the bottom wall of the storage section. , Is arranged at a position below the

In the structure in which the rack body is moved up and down by the rotation arm as in the present invention, the rack body must come to the storage position in order to prevent the rotation trajectory of the rack body from hitting the bottom wall of the storage section. Since the rack body is located slightly higher than the bottom wall of the storage unit, some space is created below the rack body in this state. The invention of claim 3 is
The drive mechanism is arranged by utilizing this space. By doing so, there is no need to prepare a special space, and the apparatus can be made compact. This is also an important factor that facilitates the dual use of the configuration with the manually operated lifting device.

According to a fourth aspect of the present invention, there is provided an electric lifting and lowering rack apparatus according to the third aspect, wherein an opening and closing work opening is provided on a bottom plate of the rack body. It is. This makes it possible to easily perform operations such as maintenance on the drive mechanism. That is, in the state where the rack body is moved to the take-out position, the bottom part of the storage unit is opened and the drive mechanism can be modified, but work in this state is forced to be performed through the rack body. Very difficult to work.
On the other hand, when a work port that can be opened and closed is provided on the bottom wall of the rack body as in claim 4, the drive mechanism can be easily operated by opening the work port even when the rack body is stored in the storage section. Because it can be multiplied.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electric lifting rack apparatus according to an embodiment of the present invention.
The elevating rack device 1 is attached to a high-level storage shelf 3 of a kitchen, and is rotatably supported by two left and right mechanism bases 11 fixed to the inner surface of the side wall of the storage shelf 3. Rotating arm, that is, the main arm 1
6, a sub arm 17, a rack main body 5 supported on the rotating ends of the arms 16, 17, and a main arm 16.
, And three detection switches 51, 52, 5 for detecting the position of the rack body 5.
3 and a control circuit 71 for controlling the rotation of the motor 40 of the drive mechanism 30 according to signals from the detection switches and the like.

[A. Rack Body] (FIGS. 1 to 3) The rack body 5 has a substantially rectangular box shape with an open front surface (a direction toward the lower right in FIG. 1 is the front side, and a direction toward the lower left is the left side). The seasoning and kitchen utensils are stored on a lattice basket 6 and a bottom plate 7 provided therein.
It is regulated by 0. A handlebar 8 extending in the left-right direction is attached to a lower end of a front portion of the rack body 5, and a relatively large work opening 7a is formed in the bottom plate 7, and a lid 9 for opening and closing the work opening 7a is provided. Is provided.

Such a rack main body 5 is lowered to a storage position stored in the storage shelf 3 as shown by a solid line in FIG. 1 and to a position immediately below the storage shelf 3 as shown by a two-dot chain line in FIG. Is moved to or from the take-out position. When the rack body 5 is in the storage position, its top surface is located near the top wall of the storage shelf 3, but since the top surface of the rack body 5 is defined by the top grid 10, the top surface is It is possible to almost certainly prevent an object from being stored in a state of popping out above.

[B. Mechanism base, rotating shaft] (FIG. 1
4 and FIG. 6) The mechanism base 11 has a rectangular thin box shape that is long in the front-rear direction, and is disposed in a vertical posture on both the left and right sides of the rack body 5 at the storage position, and is substantially at the center thereof. Bearing boss 12
(See FIG. 2) is fixed. Reference numeral 13 denotes a rotating shaft. The rotating shaft 13 is attached to the bottom plate 3 a
Both ends are rotatably supported by the bearing boss 12 in a state extending horizontally at a slightly higher position in the left-right direction. Further, an arm support pin 14 (see FIG. 3) that projects horizontally is attached to a position of the mechanism base 11 that is somewhat away from the bearing boss 12 toward the lower oblique front side.

[C. Rotating arm] (FIGS. 1, 3, 4,
FIG. 6) The main arm 16 has a flat plate shape bent in a substantially U-shape, and is welded to the rotating shaft 13 at a position near one end thereof. Accordingly, the main arm 16 is supported by the mechanism base 11 so as to rotate integrally with the rotation shaft 13 about the rotation shaft 13. The sub-arm 17 has a plate shape extending substantially in the shape of a crank, and is located on the front side of the main arm 16 and is rotatable with respect to the mechanism base 5 by passing the arm support pin 14 through a hole formed at one end thereof. Supported by These two arms 16, 17
Is pivotally connected to the upper end of the outer surface of the side wall of the rack body 5 by a pin 18 so that the rack body 5 can be turned around the rotation end of the arms 716 and 17. It is movably supported.

The shape of a line connecting the two pins 18 with the rotating shaft 13 and the arm support pins 14 in order from the side forms a parallelogram. Therefore, the rack body 5 moves between the storage position and the take-out position while maintaining the horizontal posture.

One end of the main arm 16 is formed as a U-shaped stopper 16a as can be seen from FIG. The storage-side stopper 21 and the removal-side stopper 21 ′ are provided on the mutually facing side surfaces of the left and right mechanism bases 11.
When the rack body 5 comes to the storage position, the stopper 16a of the main arm 16 comes into contact with the stopper 21 at the time of storage, and the main arm 16 is prevented from rotating further. The main body 5 is held at the storage position. At the same time when the rack body 5 comes to the take-out position, the stopper portion 16a of the main arm 16 comes into contact with the stopper 21 'at the time of take-out, so that the main arm 16 is prevented from rotating below it. Is held in the removal position.

A spiral leaf spring 25 (see FIG. 3) is externally fitted to both ends of the rotating shaft 13, and one end of the spiral spring 25 is locked by a spring hook pin 26 fixed to the mechanism base 11.
The other end is locked by a slit formed in the rotating shaft 13. By the spring force of the spiral leaf spring 25,
A rotating force in a counterclockwise direction as viewed from the left is constantly urged to the rotating shaft 13. This rotating power acts as a load for movement to the take-out position, and the take-out operation is performed in a buffered manner.

[D. Driving Mechanism] (FIGS. 2 and 4) The driving mechanism 30 is provided on the bottom plate 3 a of the high-storage shelf 3. Reference numeral 31 denotes a base plate of the driving mechanism 30,
Three support walls 3 are provided in the middle part of the upper surface in the left-right direction.
2, 33 and 34 are arranged side by side. Of these support walls, two at the left and right ends 32 and 34 are intermediate ones 3
3 and a bearing collar 36 is attached to the upper end thereof. The rotating shaft 13 is rotatably inserted through the bearing collar 36. The front portions of the right and middle support walls 34 and 33 have their upper ends joined together to form a motor mounting portion 37.

A DC power type motor 40 is mounted on the motor mounting portion 37 from the front side, and a small-diameter drive gear 41 which is an output gear of the motor 40 is rotatably supported. Further, a reduction gear 42 is rotatably supported by a shaft extending between the intermediate support wall 33 and the left support wall 32. This reduction gear 42 is large and small
The two gears 42 a and 42 b are integrally formed, and the large gear 42 a meshes with the drive gear 41.

A fan-shaped driven gear 43 is fixed to an intermediate portion of the rotating shaft 13 between the two bearing collars 36, and a small gear 42b of the reduction gear 42 meshes with the driven gear 43 from below. are doing. Therefore, the motor 40
Rotates, the rotation is caused by the driving gear 41 and the reduction gear 4.
2, the rotation is transmitted to the driven gear 43, whereby the rotation shaft 13 rotates to move the rack body 5. The rotation direction of the motor 40 is such that when the rack body 5 is moved to the take-out position side, the driven gear 43 is rotated clockwise as viewed from the left (hereinafter referred to as the motor 4).
Rotation of 0 in this direction is called "forward rotation". When the rack body 5 is moved to the storage position side, the driven gear 43 is rotated in a counterclockwise direction viewed from the left (hereinafter, rotation of the motor 40 in this direction is referred to as “reverse rotation”).
Say ) Is controlled.

When the rack body 5 is in the storage position, the drive mechanism 30 is hidden under the rack body 5, but when the lid 9 is opened, the drive mechanism 30 passes through the working opening 7a.
You can put your hands on

[E. Detection Switch] (FIGS. 2 to 4 and FIG. 6) Of the three detection switches 51, 52 and 53, 51
(See FIG. 3) is a storage detection switch for detecting that the rack body 5 has reached the storage position, and 52 (see FIG. 3) is an ejection for detecting that the rack body 5 has come to the extraction position. It is a detection switch. 53 (FIGS. 2, 4,
6) is a storage section detection switch. The storage section detection switch 53 is for detecting whether or not the rack main body 5 is in a storage section between a storage front position and a storage position indicated by a dashed line in FIG. The storage front position is a position where the rack body 5 is shifted from the storage position by approximately 35 ° toward the take-out position when viewed from the rotation center angle of the main arm 16. A separate magnetic proximity switch is used for the storage detection switch 51 and the take-out detection switch 52, and a groove-shaped magnetic proximity switch is used for the storage section detection switch 53.

An L-shaped bracket 55 is fixed to the storage stopper 21 on the right side, and a contact of the storage detection switch 51 is attached to one of the brackets 55 facing the stopper 21 from the left side. The part (reed switch) 51a is mounted in a substantially rearward posture. A bracket 55 similar to the above is also fixed to the removal stopper 21 'on the right side, and a contact of the removal detection switch 52 is attached to one of the brackets 55 facing the stopper 21' from the left side. The part 52a is mounted in a substantially downward posture.

Stopper portion 16 of right main arm 16
A magnet mounting plate 56 is fixed to the left side of a (not shown in FIG. 6), and two magnets 51b and 52b are mounted on this. The magnets 51b and 52b are arranged apart from each other in the width direction of the main arm 16, and the magnet 51b located on the front side in the state shown in FIG. This is a magnet for the switch 52.

Accordingly, the stopper 1 of the main arm 16
When the contact 6a comes into contact with the storage stopper 21 as shown by a solid line in FIG. 3, the contact portion 51a and the magnet 51b are brought close to each other with their centers aligned with each other, thereby opening and closing the contact portion 51a of the storage detection switch 51. The contacts are closed. When the stopper portion 16a of the main arm 16 comes into contact with the stopper 21 'at the time of removal as shown by a two-dot chain line in FIG. 3, the contact portion 52a and the magnet 52b are brought close to each other with their centers aligned with each other. As a result, the open / close contact of the contact portion 52a of the removal detection switch 52 is closed.

A bracket 57 rises from the right end of the base plate 31, and a storage section detection switch 53 is attached to the bracket 57. The groove 53c of the storage section detection switch 53 is oriented in the front-rear direction. A fan-shaped iron magnetic shield plate 58 with a small expansion is attached to the rotating shaft 13. The magnetic shield plate 58 is provided at a position where its wide end passes through the groove 53 c of the storage section detection switch 53. Have been. While the rack main body 5 is in the storage section, the magnetic path between the contact portion 53a of the storage section detection switch 53 and the magnet 53b is shielded by the magnetic shield plate 58, thereby opening and closing the storage section detection switch 53. Closes.

[F. Power Switch, Elevating Switch] (FIGS. 1 and 2) A power switch 61 and an elevating switch 62 are provided on the front surface of the rack body 5. These switches 61 and 6
A tumbler type 2 is used as 2 and is arranged at a position where it can be operated with the fingers of the hand holding the handlebar 8. The lifting switch 62 has a trigger state for lowering the rack main body 5 when the lower side of the operation button is pressed, and raises the rack main body 5 when the upper side of the operation button is pressed. Is incorporated in the control circuit 71 so as to form a trigger state.

[G. Control Circuit] (FIG. 5) The control circuit 71 includes the base plate 31 and the circuit board 7 attached to the base plate 31 except for the above-described various switches.
3 (see FIG. 2). Therefore, also for this control circuit 71, by opening the lid 9, the working port 7 is opened.
Maintenance can be performed by hand through a. Hereinafter, the control circuit 71 will be described.

T indicates a power transformer, and its primary coil L1 is connected to an AC 10 through an open / close contact of a power switch 61.
The secondary coil L2 is connected to a 0V power supply, and leads a lead wire L2a for stepping down 12 volts and a lead line L2b for stepping down 8 volts. A rectifier circuit D1 is connected to the lead wire L2a, and a rectifier circuit D is connected to the lead wire L2b.
2 are connected to each other, whereby the positive output terminal d1 of the rectifier circuit D1 (hereinafter referred to as “12V power terminal”) is connected.
), A voltage of 12 VDC is taken out, and a voltage of 8 VDC is taken out of a positive output terminal d2 (hereinafter, referred to as “8V power supply terminal”) of the rectifier circuit D2.
A power indicator LED is connected between the 12V power terminal d1 and the ground E. When the power switch 61 is turned on, the power indicator LED is turned on.

RX1 and RX2 indicate relays. Relay R
X1 is for controlling the rotation direction of the motor 40 and has two switching contacts COM1 and COM2.
COM1 is connected to the reverse rotation input terminal 40a of the motor 40, and is in contact with the fixed contact NC1 when the exciting coil La for controlling the same is not excited, and is fixed while the exciting coil La is excited. Contact with NO1. COM2 is a forward input terminal 40 of the motor 40.
b, and when the exciting coil Lb for controlling this is not excited, it is in contact with the fixed contact NC2, and while the exciting coil Lb is being excited, the fixed contact NO
Contact 2

The excitation coil La is connected between the 12V power supply terminal d1 and the emitter of the transistor Tr1, and the excitation coil Lb is connected between the 12V power supply terminal d1 and the emitter of the transistor Tr2. Fixed contacts NC1, N
C2 is grounded E.

The relay RX2 is for switching the supply voltage to the motor 40 to 12V or 8V according to the opening and closing of the contact of the storage section detection switch 53, and the switching contact COM is connected to the fixed contacts NO1 and NO2 of the relay RX1. When the exciting coil L for controlling this is not excited, it is in contact with the fixed contact NC, and while the exciting coil L is being excited, it is in contact with the fixed contact NO.
The fixed contact NC is connected to the 12V power terminal d1, and the fixed contact NO is connected to the 8V power terminal d2. The exciting coil L is connected between the 12V power supply terminal d1 and the emitter of the transistor Tr3.

The base of the transistor Tr1 is grounded via the bias resistor R1 and the storage detection switch 5
When one switching contact 51c is closed, it is connected to the 12V power supply terminal d1 and its collector is connected to the rising-side fixed contact 62c of the lifting switch 62. The base of the transistor Tr2 is grounded via the bias resistor R2, and is connected to the 12V power supply terminal d1 when the open / close contact 52c of the take-out detection switch 52 is closed, and its collector is connected to the falling fixed contact 62b of the lift switch 62. Have been.
The open / close contact 62a of the elevating switch 62 is
When the descending side, which is the lower part of the operation button, is pressed, it comes into contact with the descending fixed contact 62b to ground the collector of the transistor Tr2, and when the upper side, which is the upper part of the operation button, is pushed, it comes into contact with the rising fixed contact 62c. And transistor T
The collector of r1 is grounded E.

The collector of the transistor Tr3 is grounded E, and its base is grounded when the open / close contact 53d of the storage section detection switch 53 is closed. This switching contact 53d
Is closed with the magnetic shield plate 58 in the groove 53c, whereby the base of the transistor Tr3 is grounded. The lifting rack device 1 is configured as described above.

[H. Operation] (FIGS. 5 and 6) Next, the operation of the lifting rack device 1 will be described. [H-1. Initial state, power-on] When the rack body 5 is in the storage position, the main and sub arms 16, 1
7 has a substantially upright posture, and the stopper portion 16a of the main arm 16 is in contact with the stopper 21 during storage,
In the storage detection switch 51, the contact portion 51a and the magnet 51b are close to each other, and the magnetic shield plate 58 is shown in FIG.
As shown in the figure, a part thereof is in the groove 53c of the storage section detection switch 53. The position of each movable contact of the control circuit 71 shown in FIG. 5 indicates the position when the rack body 5 is at the storage position and the power switch 61 is not turned on.

When the power switch 61 is turned on from this state, the power indicator LED is turned on, and the open / close contact 51c of the storage detection switch 51 and the open / close contact 53d of the storage section detection switch 53 are closed. Accordingly, the transistor Tr3 is turned on, so that the exciting coil L of the relay RX2 is excited, and the switching contact COM becomes the fixed contact NO.
To the fixed contact NO1 of the relay RX1.
And NO2 are connected to the 8V power supply terminal d2. In this state, the two fixed contacts 62b of the elevating switch 62,
62c are not grounded, so that the transistor T
Both r1 and Tr2 are OFF. Therefore, none of the exciting coils La and Lb of the relay RX1 is excited.
The two switching contacts COM1 and COM2 are fixed contacts NC
1. Stays in contact with NC2.

In this state, since the open / close contact 51c of the storage detection switch 51 is closed and a bias voltage of 12 V is applied to the base of the transistor Tr1, the collector current does not flow through the transistor Tr1 and remains OFF. Therefore, pushing the up / down switch 62 to the ascending side has no effect.

[H-2. Removing the rack body)
When the elevating switch 62 is pushed down, the open / close contact 62
a contacts the descending fixed contact 62b and the transistor T
Since the collector of r2 is grounded, the transistor Tr2
Is turned ON, and the exciting coil Lb of the relay RX1 is excited. Therefore, since the switching contact COM2 comes into contact with the fixed contact NO2, the 8V power supply terminal d2 is connected to the normal rotation input terminal 40b of the motor 40, and the motor 40 normally rotates at a relatively low rotation speed of 8V voltage. As a result, the arms 16 and 17 rotate forward and downward to carry the rack body 5 from the storage position to the removal position at a relatively slow speed.

When the rack main body 5 comes out to the above-described storage front position, the magnetic shielding plate 58 comes out of the groove 53c of the storage section detection switch 53 as shown in FIG. The open / close contact 53d of the storage section detection switch 53 opens to turn off the transistor Tr3.
As a result, the excitation of the relay RX2 is released,
Since the switching contact COM is returned to the contact with the fixed contact NC, the 12V power supply terminal d1 is connected to the normal input terminal 40b of the motor 40. Therefore, from here on, the motor 40 rotates at a relatively high rotation speed of 12V voltage, so that the rack body 5 increases in speed and is carried to the take-out position.

When the rack body 5 reaches the take-out position,
The open / close contact 52c of the extraction detection switch 52 is closed, and the base of the transistor Tr2 is connected to the 12V power supply terminal d1. As a result, the transistor Tr2 is turned off, so that the excitation of the exciting coil Lb of the relay RX1 is released, the switching contact COM2 returns to the contact with the fixed contact NC2, and the power supply to the motor 40 is stopped. with this,
When the movement of the rack body 5 to the take-out position is completed, the magnetic shield plate 58 is moved to the rotating shaft 13 as shown in FIG.
It is located almost directly behind.

[H-3. Storage of Rack Body] When the rack body 5 is at the take-out position, the open / close contact 53d of the storage section detection switch 53 is open, so that the transistor Tr3 is OFF and the relay RX2 is not excited. Therefore, the switching contact COM of the relay RX2 is 12V
The state is in contact with the fixed contact NC on the power terminal d1 side.

In this state, when the lift switch 62 is pushed upward, the open / close contact 62a is moved to the fixed contact 62 on the upward side.
c, the collector of the transistor Tr1 is grounded, so that the transistor Tr1 is turned on and the relay R
The exciting coil La of X1 is excited. Therefore, since the switching contact COM1 contacts the fixed contact NO1, the 12V power supply terminal d1 is connected to the reverse input terminal 40a of the motor 40, and the motor 40 reverses at the rotation speed of the 12V voltage. As a result, the arms 16 and 17 rotate rearward and upward, and carry the rack main body 5 at a high speed from the extraction position to the storage position.

When the rack body 5 comes to the position before the storage, the magnetic shield plate 58 enters the groove 53c of the storage section detection switch 53, so that the open / close contact 53d of the storage section detection switch 53 is closed and the transistor Tr3 is turned off. Turn ON. As a result, the relay RX2 is excited and its switching contact COM is brought into contact with the fixed contact NO on the 8V power supply terminal d2 side.
The V power supply terminal d2 is connected. Therefore, from here on, the motor 40 rotates at a low rotation speed of the voltage of 8 V, so that the rack body 5 is stored in the storage shelf 3 at a reduced speed.

When the rack body 5 reaches the storage position, the open / close contact 51c of the storage detection switch 51 is closed, and the base of the transistor Tr1 is connected to the 12V power supply terminal d1. As a result, the transistor Tr1 is turned off, so that the excitation of the excitation coil La of the relay RX1 is released, the switching contact COM1 returns to the contact with the fixed contact NC1, and the power supply to the motor 40 is stopped. In this way, the storage of the rack body 5 is completed, and the storage is performed relatively slowly at a reduced speed, so that a strong impact is not applied when the rack body 5 stops.

For example, if the button operation on the elevating switch 62 is stopped while the rack body 5 is moving down,
When the transistor Tr2 is turned off, the excitation of the exciting coil Lb of the relay RX1 is released, whereby the switching contact COM2 is separated from the fixed contact NO2 and the motor 4 is turned off.
Power supply to 0 stops. In this case, since the motor 40 is of a DC type, its rotation is immediately stopped by stopping the power supply. Therefore, when the rack main body 5 is stopped halfway, or when any danger is felt, the user simply releases his hand from the elevating switch 62, and the lowering of the rack main body 5 is reliably stopped immediately.

The embodiment of the present invention has been described above.
The specific configuration of the present invention is not limited to this embodiment, and any change in design or the like without departing from the spirit of the present invention is also included in the present invention. In particular, in the embodiment, the position at which the rotation speed of the rotation arm is reduced when the rack body moves toward the storage position (the position before the storage) is as follows.
When viewed from the rotation center angle of the rotation arm, approximately 35 from the storage position.
と し た Although the position is shifted to the take-out position side, this position is not limited to this, and is approximately 25 at the rotation center angle.
What is necessary is just to set arbitrarily in the range of about {circle around (50)}.

[0052]

As described above, according to the present invention, it is possible to reduce the impact at least when the storage of the rack body is completed, and thereby it is almost certain that the object in the rack body is broken or collapsed. However, the time required to reduce the rotation speed of the rotating arm is only a short time from the position slightly before the storage is completed to the completion of the storage, so that the lifting time of the rack body becomes longer. Is almost none. Further, in the present invention, the position of the rack body itself is detected by the detecting means and the timing is taken as the means for taking the timing to reduce the speed. Control can be guaranteed. In the present invention, the rack body is moved by the rotation of the rotation arm, so that the rack body moves almost horizontally when the storage is completed. Since there is no upward movement, objects stored in the rack body do not jump upward.

In the embodiment, a magnetic switch is used as a detecting means for detecting the position of the rack body.
There is no mechanical fatigue, and there is no danger of malfunction due to steam or oil contamination even when installed in a kitchen or the like. Further, in the embodiment, since the speed changing means is configured to switch the rotation speed of the motor by switching the voltage, the structure of the speed changing means can be simplified.

According to the second aspect of the present invention, the mechanical structure of the rotating shaft, the rotating arm supported by the rotating shaft, the rack body, and the like is equivalent to a manually operated lifting device and an electric lifting device. It can be used in the same way.

According to the third aspect of the present invention, since the drive mechanism is arranged by utilizing the space required in the structure in which the rack body is raised and lowered by the rotating arm, a special mechanism for disposing the drive mechanism and the like is provided. There is no need to prepare a space, and the device can be configured compact, which also greatly contributes to the dual use of the configuration with a manually operated lifting device.

According to the fourth aspect of the present invention, even when the rack body is stored in the storage section, it is possible to easily work on the drive mechanism by opening the work opening, thereby easily performing maintenance and the like. be able to.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the entirety of an electric lifting rack apparatus according to an embodiment of the present invention.

FIG. 2 is an enlarged front view showing the lifting rack device of FIG. 1 with a part cut away.

FIG. 3 is an enlarged perspective view of a main part of an arm, a detection switch, and the like of the lifting rack device shown in FIG. 1;

4 is a partially cutaway perspective view in which a drive unit and the like of the lifting rack device shown in FIG. 1 are enlarged.

FIG. 5 is a diagram showing a control circuit of the lifting rack device shown in FIG. 1;

FIG. 6 is an enlarged side view of a main part showing a storage section detection operation performed by the lifting rack device of FIG. 1 in order from (A) to (C).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric raising / lowering rack apparatus 3 ... Storage part (high place storage shelf) 3a ... Bottom wall of storage part 5 ... Rack main body 7 ... Bottom plate of rack main body 7a ... Working port 11 ... Base part 13 ... Rotating shaft 16 ... Rotating arm 30 ... Driving mechanism 40 ... Motor 42 ... Gear rotated by motor 43 ... Driving gear 51 ... Detecting means 52 ... Detecting means 53 ... Detecting means 53, RX2, T ... Transmission means 71 ... Control circuit

Claims (4)

[Claims] 1. A rack main body which is moved between a storage position stored in a storage unit such as a high-level storage shelf and a take-out position lowered in front of and below the storage unit, and a base end located on a base. A rotation arm rotatably supported and having the rack body attached to a rotation end, a drive mechanism for rotating the rotation arm by using a motor as a drive source, and detection means for detecting a position of the rack body. A control circuit for controlling the driving mechanism in accordance with a control signal including a signal from the detection means, and at least when the rack body moves toward the storage position, the rack body is rotated from a position slightly before storage of the rack body is completed. An electric lifting rack device, comprising: a speed change means for lowering a rotation speed of an arm. 2. A motor-driven lifting rack device according to claim 1, further comprising a rotating shaft extending horizontally near a bottom surface of the storage portion, and a base end of the rotating arm fixed to the rotating shaft. And a driven gear is attached to the driven gear, and the driven gear is rotated by a gear rotated by a motor. 3. The electric lifting and lowering rack apparatus according to claim 2, wherein the drive mechanism is arranged at a position below the rack body that has reached the storage position on the upper surface of the bottom wall of the storage unit. Electric lifting rack device. 4. A motor-driven lifting rack device according to claim 3, wherein an openable and closable work opening is provided in a bottom plate of the rack body.