JP6424403B2 - Carry cart - Google Patents

Description

  The present invention relates to a carry cart provided with an electric assist function.

  Conventionally, in an article transfer tool such as a suitcase or a shopping cart (hereinafter, also referred to as a "carry cart"), a technology has been proposed in which the motor is driven to rotate the wheels only while the switch provided on the handle is operated. (See Patent Document 1).

  In addition, a switch is provided that operates according to the expansion and contraction of the handle, and the switch is turned on when the load applied to the handle (the weight of the load and the slope of the slope) increases, and a technology has been proposed to operate the motor. (See Patent Document 2).

Japanese Patent Application Publication No. 2001-513729 Japanese Utility Model Application Publication No. 5-56726

  In the carry cart of Patent Document 1, since the operation of the motor is either driving or stopping (moving or stopping), the carry cart suddenly starts or suddenly stops to give the user an unnatural feeling. It is conceivable.

  In the carry cart of Patent Document 2, the speed gradually increases when the switch is turned on, and gradually decreases when the switch is turned off. However, when the carry cart of Patent Document 2 is used on a road surface with a continuously changing slope, the switch is frequently turned on or off to repeatedly drive or stop the motor, resulting in unnatural movement of the carry cart. Can be considered.

  An object of the present invention is to provide a carry cart which can adjust its speed appropriately in response to a change in load.

The present invention solves the above problems by the following solution means.
According to a first aspect of the present invention, there is provided a frame body for supporting an article, two wheels rotatably provided respectively on the left and right of the frame body in the width direction, and a handle provided on the frame body and supported by a user A detection means provided at the center of the handle in the left-right direction and outputting an electric signal of an output value corresponding to the operating force for moving the carry cart, and an output of the electric signal output from the detection means A drive unit for driving the wheel to achieve a rotational speed according to a value, an urging member for urging the frame body in the longitudinal direction, and an inner side of an upper portion of the handle, the load A speed adjusting pusher plate which expands and contracts in the longitudinal direction of the frame body according to the size, and the speed adjusting pusher plate, which is provided on the speed adjusting pusher plate and which is symmetrical with respect to the detection means A pair of holding members for wearing a carry cart, characterized in that it comprises a.

  In a second invention according to the first invention, the detection means moves a linear Hall element outputting an electric signal of a voltage value proportional to the magnetic flux density of a magnetic field, a magnet generating a magnetic field, and the carry cart. Speed adjusting means for relatively bringing the linear Hall element and the magnet closer to each other as the operating force for driving the carriage increases, and as the operating force for moving the carry cart increases, the linear Hall element And the magnet relatively approach each other to increase the voltage value of the electric signal output from the linear Hall element, thereby increasing the rotational speed of the wheel driven by the drive unit, and the carry As the actuating force for moving the cart becomes smaller, the linear Hall element and the magnet are relatively separated from each other, and output from the linear Hall element That by the voltage value of the electric signal is reduced, the the rotational speed of the wheels driven by the driving unit slows down, a carry basket characterized by.

  According to the present invention, it is possible to provide a carry cart capable of properly adjusting the speed in response to a change in load.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the whole structure of the carry cart 1 in embodiment. FIG. 6 is a perspective view of the carry cart 1 from which the carry bag 40 has been removed. FIG. 7 is an exploded perspective view showing the configuration of a handle 30. It is sectional drawing which shows the structure of a switch part. FIG. 6 is an exploded front view showing a configuration of a motor drive box 50. FIG. 5 is a block diagram showing a functional configuration of a control board 55.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, the “width direction” refers to a direction parallel to the wheel shaft 21 (described later) of the carry cart 1. The “depth direction” refers to a direction orthogonal to the longitudinal direction of the main frame 11 (described later). Furthermore, the “height direction” refers to the longitudinal direction of the main frame 11.

FIG. 1 is a perspective view showing an entire configuration of the carry cart 1 in the present embodiment. FIG. 2 is a perspective view of the carry cart 1 with the carry bag 40 removed.
As shown in FIG. 1, the carry cart 1 according to the present embodiment includes a frame body 10, wheels 20, a handle 30, a carry bag 40, and a motor drive box 50 (see FIG. 2).

  The frame body 10 is a framework portion that supports the carry bag 40. As shown in FIG. 2, the frame main body 10 includes a main frame 11, a carrier 12 and a stand 13.

  The main frame 11 is a member for supporting the back surface of the carry bag 40, and is made of a pipe material formed in an inverted U shape. A handle 30 (described later) is attached to the top of the main frame 11. In the lower part of the main frame 11, a carrier 12, a stand 13, wheels 20, and a motor drive box 50 (described later) are provided.

  The carrier 12 is a member for supporting the bottom surface of the carry bag 40, and is made of a substantially U-shaped pipe material. As shown in FIG. 1, the carry bag 40 is placed on the carrier 12, and the back side is fixed to the main frame 11 by a belt (not shown).

  The stand 13 is a member for supporting the lower part of the carry cart 1 and is made of a substantially U-shaped pipe material. The user can keep the carry cart 1 upright by bringing the main frame 11 vertically and bringing the stand 13 and the wheels 20 into contact with the road surface. In addition, the user can move the carry cart 1 by holding the handle 30 of the main frame 11 and pulling it while tilting obliquely forward (in the advancing direction) from a state where the carry cart 1 is vertically stood.

  The carrier 12 and the stand 13 are configured to be foldable. In the state of FIG. 2 in which the carrier bag 40 is removed from the frame body 10, the entire frame body 10 can be made compact by folding the carrier 12 and the stand 13 to the main frame 11 side (not shown).

In FIG. 1, a carry bag 40 is a soft case for storing an article, and is attached to the main frame 11 and the carrier 12 (frame main body 10).
The wheels 20 are components that rotate when the carry cart 1 moves, and are provided below the main frame 11 (frame main body 10). The wheels 20 are respectively provided on the left and right of the main frame 11 in the width direction. The two wheels 20 are attached to both ends of a wheel shaft 21 (described later).

  The handle 30 is a component supported by the user, and is provided on the top of the main frame 11 (frame main body 10). As shown in FIG. 2, the handle 30 includes a handle cover 31, a speed adjustment switch 32, and a power switch 33. The configuration of the handle 30 will be described later.

  The motor drive box 50 (drive unit) drives the wheel 20 to have a rotational speed corresponding to a detection signal output from a linear Hall IC 350 described later. The configuration of the motor drive box 50 will be described later.

Next, the configuration of the handle 30 will be described.
FIG. 3 is an exploded perspective view showing the configuration of the handle 30. As shown in FIG. FIG. 3A shows a state in which no operating force is applied to the speed adjustment switch 32. FIG. 3B shows a state in which the operating force is applied to the speed adjustment switch 32. 3 is an exploded perspective view when the second cover 312 (see FIG. 2) of the handle cover 31 is removed and viewed from the back side of the first cover 311. As shown in FIG. In FIG. 3, the main reference numerals are shown in FIG. 3 (a).

  In the following description, “operating the speed adjustment push plate 330” means that the user puts a hand on the handle 30, grips the speed adjustment push plate 330, and moves the carry cart 1 while pulling it. When the user operates the speed adjustment push plate 330, the operating force applied to the speed adjustment push plate 330 changes according to the size of the load (load weight, slope of slope) generated on the carry cart 1 .

  Here, the operating force is a force applied by the user to the speed adjusting push plate 330 to move the carry cart 1. When the user grips the speed adjustment push plate 330 and moves it while pulling the carry cart 1, an operating force according to the magnitude of the load generated on the carry cart 1 is applied to the speed adjustment push plate 330 from the user's hand. .

  The handle cover 31 is a component that covers the entire handle 30. The handle cover 31 includes a first cover 311 and a second cover 312 (see FIG. 2). The first cover 311 and the second cover 312 are attached so as to sandwich the upper portion of the main frame 11 (frame main body 10) from both sides. At both end portions in the longitudinal direction of the handle cover 31, a pair of pressing plate guides 313 for movably holding a speed adjusting pressing plate 330 (described later) is provided.

  The speed adjustment switch 32 includes a fixed plate 320, a speed adjustment push plate 330, a spring 340, a linear Hall IC 350, and magnets 360 and 361. Among these, the fixed plate 320, the speed adjustment push plate 330, and the spring 340 constitute a speed adjustment means in the present embodiment.

  The fixed plate 320 is a component that movably supports a speed adjustment push plate 330 described later. The fixing plate 320 includes a pin guide 321 and an IC holding piece 322. The pin guide 321 is a portion into which a spring holding pin 331 (described later) of the speed adjustment pressing plate 330 is inserted, and is provided at two places. The IC holding piece 322 is a portion for holding the linear Hall IC 350 (described later), and is provided between the two pin guides 321.

  The fixing plate 320 is attached to the upper portion of the main frame 11 by fitting the pin guide 321 and the IC holding piece 322 into three holes (not shown) provided at the upper portion of the main frame 11.

  The speed adjustment push plate 330 is a portion that the user of the carry cart 1 holds the hand. The speed adjustment pressing plate 330 includes a spring holding pin 331, an engagement piece 332, and a magnet holding piece 333. The spring holding pin 331 is a portion to which the spring 340 is attached. The spring holding pins 331 are provided at two positions at positions facing the pin guides 321 (fixing plates 320). The engagement piece 332 is a portion that engages with the pressing plate guide 313 of the handle cover 31.

  The spring 340 is attached to the spring holding pin 331 of the speed adjustment pressing plate 330, and the tip of the spring holding pin 331 is inserted into the pin guide 321 (fixing plate 320). Then, the engagement piece 332 of the speed adjustment push plate 330 is engaged with the push plate guide 313 (first cover 311), and the second cover 312 is fitted into the first cover 311, thereby the speed adjustment push plate 330 is handled as a handle. It can be attached to the cover 31.

  In the state where the operation force is not applied to the speed adjustment push plate 330 (when the user is not operating), the speed adjustment push plate 330 is pushed against the fixing plate 320 by the biasing force of the spring 340 and fixed plate Move to a position away from 320. As shown in FIG. 3A, in the speed adjustment pressing plate 330, the engagement piece 332 abuts on the end of the pressing plate guide 313 at a position farthest from the fixing plate 320. In this position, the movement of the speed adjustment pressing plate 330 in the direction away from the fixing plate 320 is restricted.

  In addition, in a state in which the speed adjustment push plate 330 is added to the speed adjustment push plate 330 (operated by the user), the speed adjustment push plate 330 approaches the fixing plate 320 against the biasing force of the spring 340. When the user moves the carry cart 1 while holding the speed adjustment push plate 330, the work added to the speed adjustment push plate 330 as the load (load weight, slope of slope) generated on the carry cart 1 increases. Power increases. As the operating force applied to the speed adjustment push plate 330 increases, the speed adjustment push plate 330 further moves to the side of the fixed plate 320 against the biasing force of the spring 340 and approaches the fixed plate 320. As shown in FIG. 3B, when the speed adjustment push plate 330 approaches the fixed plate 320 and the spring 340 is in the most contracted state, the movement of the speed adjustment push plate 330 toward the fixed plate 320 is restricted. Be done.

  Further, as shown in FIG. 3, the handle 30 is provided with a power switch 33 (in FIG. 3, only the switch substrate is shown). The power switch 33 is a component for starting or stopping a power supply circuit (see FIG. 6) described later, and is operated by the user.

  Next, the configuration of the linear Hall IC 350 and the magnet 360 in the speed adjustment switch 32 will be described. The linear Hall IC 350 and the magnet 360 constitute a detection means in the present embodiment.

  FIG. 4 is a schematic cross-sectional view showing the configuration of the linear Hall IC 350 and the magnet 360. As shown in FIG. FIG. 4A shows a state in which no operating force is applied to the speed adjustment switch 32. FIG. 4B shows a state in which the operating force is applied to the speed adjustment switch 32.

  As shown in FIG. 4, a linear Hall IC 350 is held at the tip of the substantially L-shaped IC holding piece 322 (fixing plate 320). The linear Hall IC 350 detects a magnetic field from the N pole to the S pole of the magnet 361 (described later) (a magnetic field passing from the back side of the linear Hall IC 350 to the mark surface 351), and a voltage proportional to the magnitude of the magnetic flux density It is an element that outputs a value electric signal as a detection signal. Conversely, the linear Hall IC 350 does not detect a magnetic field (a magnetic field passing from the mark surface 351 side to the back side of the linear Hall IC 350) from the N pole to the S pole of the magnet 360 (described later). The linear Hall IC 350 is arranged such that the surface opposite to the mark surface 351 faces the N pole of the magnet 361. The detection signal output from the linear Hall IC 350 is sent to a control circuit 554 (see FIG. 6) described later.

  On the other hand, a pair of magnets 360 and 361 are disposed at the substantially U-shaped tip end portion of the magnet holding piece 333 (speed adjustment push plate 330). The magnets 360 and 361 are members that generate a magnetic field. As shown in FIG. 4, the magnet 360 is disposed such that the N pole faces the mark surface 351 of the linear Hall IC 350. According to this, when the linear Hall IC 350 approaches the magnet 360, the magnetic flux density of the magnetic field passing from the back surface side of the linear Hall IC 350 toward the mark surface 351 (the magnetic field from the N pole to the S pole of the magnet 361) decreases. The voltage value of the detection signal output from the linear Hall IC 350 decreases.

  The magnet 361 is disposed such that the N pole faces the surface of the linear Hall IC 350 opposite to the mark surface 351. According to this, when the linear Hall IC 350 approaches the magnet 361, the magnetic flux density of the magnetic field passing from the back surface side of the linear Hall IC 350 toward the mark surface 351 (the magnetic field from the N pole to the S pole of the magnet 361) increases. The voltage value of the detection signal output from the linear Hall IC 350 is increased.

  As described above, the speed adjusting push plate 330 moves to the position farthest from the fixing plate 320 in the state where the operating force is not applied (see FIG. 3A). In this case, since the linear Hall IC 350 held by the IC holding piece 322 moves to the position farthest from the magnet 361 as shown in FIG. The magnetic flux density of the magnetic field of the passing magnet 361 is the smallest.

  On the other hand, the speed adjustment push plate 330 approaches the side of the fixed plate 320 in the state where the actuating force is applied. Thereby, since the linear Hall IC 350 held by the IC holding piece 322 approaches the magnet 361, the magnetic flux density of the magnetic field passing from the back surface side of the linear Hall IC 350 toward the mark surface 351 is increased. Then, when the actuating force applied to the speed adjusting push plate 330 is maximized, the linear Hall IC 350 held by the IC holding piece 322 comes closest to the magnet 361 as shown in FIG. The magnetic flux density of the magnetic field of the magnet 361 passing from the back surface side to the mark surface 351 side is the largest.

  Therefore, as the actuation force applied to the speed adjustment push plate 330 decreases, the linear Hall IC 350 and the magnet 361 are separated, and the voltage value of the detection signal output from the linear Hall IC 350 decreases. Further, as the operating force applied to the speed adjusting push plate 330 increases, the linear Hall IC 350 and the magnet 361 approach each other, and the voltage value of the detection signal output from the linear Hall IC 350 increases.

  As described above, the detection signal output from the linear Hall IC 350 as the linear Hall IC 350 and the magnet 361 approach or separate according to the magnitude of the operating force applied to the speed adjustment push plate 330. The voltage value of V changes continuously.

Next, the configuration of the motor drive box 50 will be described.
FIG. 5 is an exploded front view showing the configuration of the motor drive box 50. As shown in FIG. FIG. 5 is an exploded front view when the second cover 512 (see FIG. 2) of the box cover 51 described later is removed and viewed from the back side of the first cover 511.

As shown in FIG. 5, the motor drive box 50 includes a box cover 51, a gear mechanism 52, a motor 53, a battery pack 54, and a control board 55.
The box cover 51 is a component that covers the entire motor drive box 50. The box cover 51 includes a first cover 511 and a second cover 512. The first cover 511 and the second cover 512 are attached so as to sandwich the gear mechanism 52, the motor 53, the battery pack 54, and the control board 55 from both sides.

  The gear mechanism 52 is a device that reduces the number of rotations of the rotational output generated by the motor 53 (described later) by using a plurality of reduction gears. Specifically, the gear mechanism 52 converts the rotation output of high rotation and low torque generated by the motor 53 into a rotation output of low rotation and high torque. The wheel shaft 21 is connected to the gear on the output side of the gear mechanism 52. Wheels 20 are attached to both ends of the wheel shaft 21.

  The motor 53 is a device that generates a rotational output for driving the wheel 20. The motor 53 of this embodiment is constituted by a direct current motor. The rotation output generated by the motor 53 is decelerated according to the reduction ratio set for each gear while being sequentially transmitted to each gear of the gear mechanism 52, and drives the wheel shaft 21. The rotational speed of the rotational output generated by the motor 53 is controlled by a drive signal supplied from a motor drive circuit 552 (described later).

  The battery pack 54 is a device that outputs DC power to the motor 53. The battery pack 54 of the present embodiment is configured of a lithium ion rechargeable battery. The control board 55 includes a power jack (not shown). The battery pack 54 is charged via a charger (AC power adapter) connected to the power jack.

Next, the configuration of the control board 55 will be described with reference to FIG. FIG. 6 is a block diagram showing a functional configuration of the control board 55. As shown in FIG. In FIG. 6, only the main configuration of the control substrate 55 is illustrated.
As shown in FIG. 6, the control board 55 includes a power supply circuit 551, a motor drive circuit 552, a linear Hall IC input circuit 553, and a control circuit 554.

  The power supply circuit 551 is a circuit that supplies DC power output from the battery pack 54 to the motor drive circuit 552, the linear Hall IC 350, and the like through the control circuit 554. The power switch 33 is connected to the power circuit 551. The user turns on or off the power switch 33 to start or stop the power circuit 551.

The motor drive circuit 552 is a circuit that supplies a drive signal to the motor 53 based on the DC power supplied from the battery pack 54 via the control circuit 554. The drive signal supplied from the motor drive circuit 552 to the motor 53 is controlled according to the speed instruction signal output from the control circuit 554 to the motor drive circuit 552. For example, when the motor 53 is subjected to PWM control, the motor drive circuit 552 controls the duty ratio of the drive signal (pulse signal) supplied to the motor 53 in accordance with the speed instruction signal output from the control circuit 554.
The linear Hall IC input circuit 553 A / D converts an analog detection signal output from the linear Hall IC, and outputs it to the control circuit 554.

  The control circuit 554 is an electronic component that generally controls the operation of the motor drive box 50, and includes a microcomputer and its peripheral circuits. The control circuit 554 outputs a speed instruction signal to the motor drive circuit 552 such that the rotational output of the motor 53 has a rotational speed corresponding to the voltage value of the detection signal input via the linear Hall IC input circuit 553. Specifically, the control circuit 554 outputs a speed instruction signal to the motor drive circuit 552 such that the number of rotations of the rotational output of the motor 53 increases as the voltage value of the input detection signal increases. Further, the control circuit 554 outputs a speed instruction signal to the motor drive circuit 552 so that the number of rotations of the rotational output of the motor 53 decreases as the voltage value of the input detection signal decreases.

  In the control circuit 554, the voltage value of the detection signal input through the linear Hall IC input circuit 553 (see below) in the state where the operating force is not applied to the speed adjustment push plate 330 (see FIG. 4A). , "Minimum voltage value" is stored. The control circuit 554 does not output the speed instruction signal to the motor drive circuit 552 when the voltage value of the input detection signal is equal to or less than the minimum voltage value. Further, when the voltage value of the input detection signal exceeds the minimum voltage value, the control circuit 554 causes the motor 53 to have a rotational speed corresponding to the voltage value of the input detection signal. A speed instruction signal is output to drive circuit 552.

  In the carry cart 1 of the present embodiment, when the user turns on the power switch 33, the power circuit 551 is activated, and supply of power from the power circuit 551 to the control circuit 554 and the like is started. In a state where the user does not hold the speed adjustment push plate 330, the speed adjustment push plate 330 is moved to a position farthest from the fixing plate 320 as shown in FIG. 3A. In this state, the motor 53 of the carry cart 1 is not driven because the control circuit 554 does not output the speed instruction signal to the motor drive circuit 552.

  On the other hand, when the user grips the speed adjustment push plate 330 and moves the carry cart 1 while pulling it, the speed adjustment push is performed according to the size of the load (load weight, slope of slope) generated on the carry cart 1 The actuating force applied to the plate 330 changes. That is, as the load generated on the carry cart 1 increases, the operating force applied from the user's hand to the speed adjustment push plate 330 increases. Further, as the load generated on the carry cart 1 decreases, the actuating force applied from the user's hand to the speed adjustment push plate 330 decreases.

  In the carry cart 1, when the operation force applied to the speed adjustment push plate 330 becomes large, the speed adjustment push plate 330 further moves to the side of the fixed plate 320 against the biasing force of the spring 340 and approaches the fixed plate 320. . When the speed adjusting push plate 330 approaches the fixed plate 320, the linear Hall IC 350 and the magnet 361 relatively approach, and the voltage value of the detection signal output from the linear Hall IC 350 increases. The control circuit 554 causes the speed of the motor drive circuit 552 to increase the number of rotations of the rotational output of the motor 53 as the voltage value of the detection signal input from the linear Hall IC 350 via the linear Hall IC input circuit 553 increases. Output an instruction signal. Therefore, as the load on the carry cart 1 increases and the actuating force applied to the speed adjustment pressing plate 330 increases, the rotational speed of the wheels 20 driven by the motor 53 increases.

  When the operating force applied to the speed adjustment push plate 330 of the carry cart 1 becomes smaller, the speed adjustment push plate 330 is pushed to the opposite side of the fixing plate 320 by the biasing force of the spring 340 and separates from the fixing plate 320. When the speed adjusting push plate 330 separates from the fixed plate 320, the linear Hall IC 350 and the magnet 361 are separated relatively, and the voltage value of the detection signal output from the linear Hall IC 350 decreases. The control circuit 554 sets the speed of the motor drive circuit 552 such that the number of rotations of the rotational output of the motor 53 decreases as the voltage value of the detection signal input from the linear Hall IC 350 via the linear Hall IC input circuit 553 decreases. Output an instruction signal. Therefore, as the load on the carry cart 1 decreases and the actuating force applied to the speed adjustment push plate 330 decreases, the rotational speed of the wheels 20 driven by the motor 53 decreases.

According to the carry cart 1 of the above-described embodiment, the following effects can be obtained.
(1) In the carry cart 1 of the present embodiment, the motor 53 is driven such that the rotational speed of the wheel 20 changes in accordance with the change in load. Therefore, even when used on a road surface where the load changes continuously, the movement of the carry cart 1 does not become unnatural because the driving or stopping (moving or stopping) of the motor 53 is not repeated. Therefore, according to the carry cart 1 of the present embodiment, the speed can be appropriately controlled in accordance with the change of the load.

(2) The carry cart 1 of the present embodiment is provided with a mechanism for causing the linear hole IC 350 and the magnet 361 to relatively approach or separate according to the operation force for moving the carry cart 1. According to this, as the operating force for moving the carry cart 1 increases, the linear Hall IC 350 and the magnet 361 relatively approach to each other, and the rotation speed of the wheel 20 automatically increases. Therefore, it is not necessary for the user to adjust the operating force applied to the speed adjusting push plate 330 by itself and to strengthen it as the load generated on the carry cart 1 increases. In addition, as the operating force for moving the carry cart 1 becomes smaller, the linear Hall IC 350 and the magnet 361 are separated relatively, and the rotational speed of the wheel 20 is automatically reduced. Therefore, it is not necessary for the user to adjust the operating force applied to the speed adjusting push plate 330 by itself and to weaken it, as the load generated on the carry cart 1 becomes smaller.

(3) The carry cart 1 of Patent Document 2 described above gives an unnatural feeling to the user supporting the handle 30 because the handle 30 expands and contracts according to the magnitude of the load applied to the handle 30. Conceivable. However, the carry cart 1 of the present embodiment does not cause the user supporting the handle 30 to feel unnatural because the main frame 11 does not expand and contract when moving.

The present invention is not limited to the above-described embodiment, and various modifications and changes as described below are possible, and they are also within the scope of the present invention.
In this embodiment, an example in which the linear Hall IC 350 is held by the fixing plate 320 (IC holding piece 322) and the magnets 360 and 361 are held by the magnet holding piece 333 (speed adjustment pressing plate 330) has been described. Not limited to this, the linear Hall IC 350 may be held by the magnet holding piece 333, and the magnets 360 and 361 may be held by the fixing plate 320.

  In the present embodiment, an example in which a linear Hall IC is used as a detection means for outputting an electrical signal of an output value corresponding to the operating force for moving the carry cart 1 has been described, but another proximity sensor may be used. Good.

  In the present embodiment, an example in which the carry bag 40 is a soft case has been described. Not limited to this, the carry bag 40 may be a hard case. Further, the present invention is not limited to the example in which the carry bag 40 is mounted on the carry cart 1, and the use form may be such that the article is directly mounted on the frame body 10 of the carry cart 1.

  1: Carry cart, 10: Frame body, 20: Wheel, 30: Handle, 32: Speed adjustment switch, 322: IC holding piece, 330: Speed adjustment push plate, 333: Magnet holding piece, 340: Spring, 350: Linear Hall IC, 360, 361: Magnet, 40: Carry bag, 50: Motor drive box, 53: Motor, 54: Battery, 554: Control circuit

Claims (2)

A frame body for supporting an article;
Two wheels rotatably provided respectively on the left and right of the frame body in the width direction ;
A handle provided on the frame body and supported by a user;
Detection means provided at the center in the left-right direction of the steering wheel and outputting an electric signal of an output value corresponding to the operating force for moving the carry cart;
A drive unit for driving the wheel so as to have a rotational speed corresponding to the output value of the electric signal output from the detection means;
A biasing member for biasing the frame body in the longitudinal direction;
A speed adjusting push plate provided inside the upper portion of the handle and extending and contracting in the longitudinal direction of the frame body according to the size of the load generated on the main carry cart;
A pair of holding members provided on the speed adjusting push plate, symmetrically positioned about the detection means and mounted on the biasing member;
A carry cart characterized by comprising. In the carry cart according to claim 1,
The detection means
A linear Hall element that outputs an electrical signal of a voltage value proportional to the magnetic flux density of the magnetic field;
A magnet that generates a magnetic field,
And speed adjusting means for relatively bringing the linear Hall element and the magnet into close proximity as the actuating force for moving the carry cart increases.
As the linear Hall element and the magnet approach each other relatively and the voltage value of the electrical signal output from the linear Hall element increases as the operating force for moving the carry cart increases. The rotational speed of the wheel driven by the drive unit is increased,
As the actuating force for moving the carry cart becomes smaller, the linear Hall element and the magnet are separated from each other, and the voltage value of the electrical signal output from the linear Hall element becomes smaller. The rotational speed of the wheel driven by the drive unit is reduced;
Carry cart characterized by.

Images