JP2016060465A - Power-assisted carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to exhibit an assist effect in only a period in which such an assist effect is required during transport travelling of a carriage.SOLUTION: A power-assisted carriage has: a vehicle body having a load-carrying platform; an in-wheel motor attached to the vehicle body; a wheel with a motor to which the in-wheel motor is attached; a controller; and a torque sensor which detects a torque acting on a predetermined part of a handle attached to the vehicle body when the handle is pushed by a user. In the power-assisted carriage, the controller operates the in-wheel motor when the torque sensor detects a torque equal to or more than a pre-set threshold, and stops the in-wheel motor at a point of time when a pre-set time has lapsed after the torque sensor detected a torque equal to or more than the pre-set threshold.SELECTED DRAWING: Figure 10

Description

  The present invention relates to an electric assist cart, and more particularly to an electric assist cart that can efficiently use an assist effect of an electric motor.

  A cart that is equipped with an electric motor and that can be easily transported using its assist effect, that is, an electric assist cart is already well known (see, for example, Patent Document 1). As shown in Patent Document 1, a general electric assist cart includes an electric motor that drives driving wheels of the cart, and a battery that supplies electric power to the electric motor.

JP2013-124008A

  By the way, when carrying the electric assist cart, the assist effect is not always required, and the above-described assist effect can be used only when the load becomes relatively large, for example, when the cart starts to move. Just do it. On the other hand, in a configuration where the assist effect is always demonstrated, more power is required, so a large-capacity battery is mounted on the cart, resulting in an increase in product size and cost. There is a risk that Further, if the assist effect is exhibited even when the assist effect is not required, there is a possibility that problems such as erroneous traveling of the carriage may occur. If an attempt is made to provide a safety device or the like on the carriage in order to prevent the occurrence of such problems, there is a risk that the operation will be further complicated in addition to the increase in size and cost of the product.

  Therefore, the present invention has been made in view of the above-described problems, and the object of the present invention is to allow the assist effect to be exhibited only during a period in which the assist effect is required during the traveling of the carriage. It is to provide an electric assist cart.

  According to the electric assist cart according to the present invention, (A) a vehicle body having a cargo bed and wheels attached to the cargo bed, and (B) a vehicle body attached to the vehicle body and moving the vehicle body forward by a user. A handle to be pushed, (C) an electric motor attached to the vehicle body and rotating to assist the rotation of the wheel, (D) a control device for controlling an operating state of the electric motor, and (E) the user by the user A detector that detects a reaction force that acts on a predetermined portion of the handle when the handle is being pressed, and (F) the control device is configured so that the detector is more than a preset threshold value. The problem is solved by operating the electric motor when a force is detected, and stopping the electric motor when a preset time has elapsed after the detector detects the reaction force equal to or greater than the threshold.

  In the above configuration, a reaction force acting on a predetermined portion of the handle of the carriage being pushed by the user is detected, and when the reaction force exceeding the threshold is detected, the electric motor is operated, and then a predetermined time has elapsed. Stop the motor. Thereby, for example, when the reaction force is equal to or greater than the threshold, such as when the electric assist cart starts to move forward, the assist effect by the electric motor is exhibited, and the assist effect can be used efficiently.

Further, in the above-described electric assist cart, the handle is attached to the cargo bed via a shaft portion provided at a lower end portion of an extending portion that extends in the up-down direction, and the detector is connected to the user A torque sensor that detects a torque that acts on the shaft when the handle is pressed, and the torque sensor outputs a signal when the torque equal to or greater than the threshold is detected, and the torque sensor When the output signal is received, the control device may further include a signal generation device that generates a command signal for operating the electric motor and transmits the command signal to the control device.
In the above configuration, a torque sensor for detecting the torque acting on the shaft portion of the handle is provided, and when the signal generator receives a signal output triggered by detecting a torque exceeding the threshold value, A signal is transmitted from the signal generation device to the control device. With such a configuration, the motor can be reliably operated when a torque equal to or greater than the threshold value is detected.

In the electric assist cart described above, it is further preferable that a biasing member that applies a biasing force in a direction opposite to the direction in which the torque acts is attached to the lower end portion of the extension portion.
In the above configuration, when the carriage is in a normal running state after starting to move, the urging force of the urging member acts on the handle, so that the torque as the reaction force generated by the user pushing the handle is not detected. As a result, while the carriage is in a normal running state, the assist effect by the electric motor can be kept without being exhibited.

In the electric assist cart, the control device and the signal generation device are provided on one end side in the front-rear direction of the cargo bed, and the electric motor is provided on the other end side in the front-rear direction of the cargo bed. Still better.
According to said structure, since a control apparatus and a signal generation apparatus are arrange | positioned in the position away from the electric motor, compared with the structure where these apparatuses are arrange | positioned collectively, the enlargement of the size of the whole electric assist cart is suppressed. It becomes possible.

Furthermore, in the electric assist cart described above, it is preferable that the control device, the signal generation device, and the electric motor are arranged at a position that fits inside the outer edge of the cargo bed.
In the above configuration, since the control device, the signal generation device, and the electric motor are located within the outer edge of the cargo bed, the size of the electric assist cart can be further reduced.

In the electric assist cart described above, the control device includes a memory in which setting values of the threshold value and the time are recorded, and the user changes a setting value of at least one of the threshold value and the time. An operation panel that accepts an operation to be performed for the operation, and when the operation panel accepts the operation, the control device updates the at least one setting value stored in the memory with the changed setting value. Even better.
In the above-described configuration, the user's change operation is accepted on the operation panel, and the control device updates the threshold value and the set time stored in the memory according to the operation content. As a result, various setting values can be freely changed, and usability for the user is improved.

Further, in the above-described electric assist cart, it has a movable stopper attached to the cargo bed in a state where it can move up and down, and when the movable stopper is at the lower end position in the movement range of the movable stopper, When the wheel is in contact with the ground contact surface that is in contact with the ground and is at the upper end position in the movement range, it is more preferable that the wheel is separated from the ground contact surface.
In the above configuration, a movable stopper is attached, and if the movable stopper is lowered in a situation where the carriage is held in a stopped state, the carriage is fastened even if a reaction force exceeding the threshold acts on the handle unintentionally. It is possible to keep. On the other hand, if the movable stopper is raised in a situation where the carriage is running, the carriage can run smoothly.

  According to the electric assist cart of the present invention, for example, when the electric assist cart starts to move forward, the assist effect by the electric motor can be exhibited only when the reaction force is equal to or greater than the threshold value. Thereby, it becomes possible to use efficiently the assist effect by an electric motor.

It is a perspective view which shows the external appearance of the electrically assisted trolley | bogie which concerns on one Embodiment of this invention. It is a figure when the electrically assisted trolley | bogie which concerns on one Embodiment of this invention is seen from back. It is a figure when the electrically assisted trolley | bogie which concerns on one Embodiment of this invention is seen from the downward direction. It is a figure which shows the structure of the periphery of a steering wheel lower end part. It is a figure which shows a movable stopper. 6A shows the movable stopper in the travel-permitted state, and FIG. 6B shows the movable stopper in the travel-restricted state. It is a block diagram which shows the control system of the electrically assisted trolley | bogie which concerns on one Embodiment of this invention. It is a figure which shows an operation panel. It is a figure which shows the various setting values memorize | stored in memory. It is a figure which shows the control flow of electric assistance.

  Hereinafter, one embodiment (this embodiment) of the present invention will be described with reference to FIGS. 1 to 4 show the actual configuration somewhat simplified for the sake of illustration. For example, the illustration of the wiring cable and the like is omitted. In the following description, “up and down direction” means the up and down direction when each drive wheel of the electric assist cart according to the present embodiment is installed on a horizontal plane.

  The embodiment described below is merely an example for facilitating understanding of the present invention, and does not limit the present invention. That is, the present invention can be changed and improved without departing from the gist thereof, and the present invention includes its equivalents. In particular, the outer shape, dimensions, and material of each device constituting the electric assist cart are not particularly limited, and can be arbitrarily designed.

  The electric assist cart 1 according to the present embodiment is configured by attaching an electric motor, a power source, and control-related equipment to a general-purpose cart. Specifically, as shown in FIGS. 1 to 3, the electric assist cart 1 according to the present embodiment includes a cart body 2, an in-wheel motor 3 as an electric motor, and a battery 4 as a power source as main mechanical elements. . The trolley body 2 has substantially the same configuration as a commercially available trolley, and specifically includes a vehicle body 11 and a handle 16. The vehicle body 11 includes a loading platform 12 on which a load is placed, and a pair of driving wheels are attached to the front end portion and the rear end portion of the lower surface thereof. A pair of driving wheels attached to the front end portion of the lower surface of the loading platform 12, that is, the front wheels 13 are fixed wheels in which the axial direction of the rotation shaft is fixed, and are arranged at intervals in the width direction of the loading platform 12. Has been. A pair of drive wheels attached to the rear end of the bottom surface of the loading platform 12, that is, the rear wheels 14, are free wheels whose axial direction of the rotation shaft is variable, and are spaced apart in the width direction of the loading platform 12. It is arranged in the space.

  Moreover, as shown in FIG. 3, the wheel with the in-wheel motor 3 (henceforth, the wheel 15 with a motor) is attached to the part located in the middle of a pair of front wheels 13 among the lower surfaces of the loading platform 12. . The motor-equipped wheel 15 rotates independently when the in-wheel motor 3 is activated. That is, when the in-wheel motor 3 is activated and the motorized wheel 15 is rotated, the traveling of the carriage body 2 is assisted (in other words, the electric assist effect is exhibited).

  The handle 16 is an inverted U-shaped component attached to the rear end of the loading platform 12. When the handle 16 is pushed (forward) by the user, the vehicle body 11 moves forward, and when pulled (rearward), the vehicle body 11 moves backward. Moreover, as shown in FIGS. 1 and 2, both end portions of the handle 16 are extended portions 16 a that extend in the vertical direction. Furthermore, as shown in FIG. 4, a shaft portion 16b that protrudes outward from the outer surface of the extension portion 16a is provided at the lower end portion of the extension portion 16a. The shaft portion 16 b is assembled to a handle mounting bracket 17 that is attached to the rear corner of the upper surface of the loading platform 12. Thus, the handle 16 is attached to the loading platform 12 via the shaft portion 16b and the handle attachment bracket 17.

  In addition, as shown in FIG. 2, the handle mounting brackets 17 provided at the corner on one end side (left end side) and the corner on the other end side (right end side) in the width direction of the loading platform 12 are They are connected by a rod-like connecting member 18 extending along the width direction. The connecting member 18 is disposed behind the extending portions 16a provided on both side portions of the handle 16. As shown in FIG. 4, one end of a coil spring 19 as an urging member is hooked and fixed to the connecting member 18. The coil spring 19 applies the tension (compression tension) to the handle 16 as an urging force. As shown in FIG. 4, the end of the coil spring 19 opposite to the side fixed to the connecting member 18 is hooked and fixed to the rear surface of the lower end of the extension 16 a of the handle 16. ing. Thereby, the urging | biasing force of the coil spring 19 mentioned above is provided to the lower end part of the extension part 16a.

  Further, a movable stopper 20 shown in FIG. 5 is attached to the rear end of the lower surface of the loading platform 12. The movable stopper 20 is constituted by a known pedal stopper. More specifically, the movable stopper 20 includes an adjuster 21, a pedal portion 22, and a lock portion 23 as shown in FIGS. 5 and 6A and 6B. The adjuster 21 can move up and down. When the adjuster 21 is at the lower end position in the movement range, the wheel 21, 14, 15 of the carriage main body 2 abuts on a ground contact surface (that is, the ground), and the upper end in the movement range. When in position, it is separated from the ground. The pedal portion 22 is connected to the adjuster 21 and moves the adjuster 21 downward by being stepped down by the user. The lock portion 23 is operated by the user (specifically, stepped on) when the pedal portion 22 that has been depressed is lifted. When the lock portion 23 is operated, a return mechanism (not shown) returns to the position before the pedal portion 22 is stepped down, and the movable stopper 20 rises in conjunction with this.

  Then, as shown in FIG. 6A, when the adjuster 21 reaches the upper end position and moves away from the ground, the movable stopper 20 enters a state in which the vehicle body 11 is allowed to travel (travel permitted state). On the other hand, as shown in FIG. 6B, when the adjuster 21 reaches the lower end position and comes into contact with the ground, the movable stopper 20 enters a state (running restriction state) that restricts the travel of the vehicle body 11. With such a configuration, for example, even if the electric assist is unintentionally activated, if the movable stopper 20 is in the travel restriction state, the travel of the vehicle body 11 is restricted, and thus the electric assist cart 1 moves. It becomes possible to suppress this.

  The in-wheel motor 3 is attached to the vehicle body 11, strictly speaking, the motor-equipped wheel 15 described above, and assists the rotation of the wheel by transmitting its own rotational force to the motor-equipped wheel 15. The battery 4 supplies electric power to the in-wheel motor 3 and a controller 30 to be described later, and is constituted by a lithium battery in this embodiment. In this embodiment, as shown in FIGS. 1 and 2, the battery 4 is attached to the outer surface of the extending portion 16a provided at one side end portion (left end portion) of the both end portions of the handle 16. It has been. More specifically, the battery 4 is attached to a region located on the inner side in the width direction of the loading platform 12 in the outer surface of the extending portion 16a via a base plate (not shown). However, the arrangement position of the battery 4 is not limited to the above position, and can be arbitrarily determined as long as the position is suitable in consideration of the structure of the cart body 2.

  Next, control-related equipment provided in the electric assist cart 1 will be described. As shown in FIG. 7, the electric assist cart 1 includes a controller 30, a torque sensor 33, a PAS (Power Assist System) module 34, and a control circuit 35 as control-related devices. Each of these devices is unitized and attached to the vehicle body 11 via a base plate or the like. The electric assist cart 1 further includes an operation panel 36 shown in FIG.

  The torque sensor 33 is an example of a detector for detecting a reaction force acting on a predetermined portion of the handle when the handle 16 is pushed by the user, specifically, a torque acting on the shaft portion 16b. It is provided. In the present embodiment, the torque sensor 33 is constituted by a magnetostrictive sensor, and is attached to the lower end portion of the extending portion 16a provided with the shaft portion 16b in the handle 16, as shown in FIG. The torque sensor 33 outputs a signal toward the PAS module 34 when detecting a torque equal to or greater than a predetermined value (specifically, a threshold value described later).

  The PAS module 34 corresponds to a signal generation device, and generates a command signal for causing the controller 30 to operate the in-wheel motor 3 when receiving an output signal from the torque sensor 33. The generated command signal is transmitted from the PAS module 34 to the controller 30. In the present embodiment, the PAS module 34 is accommodated in the casing 37 together with the controller 30, and is attached to the lower surface of the loading platform 12 as shown in FIG. More specifically, the PAS module 34 and the controller 30 housed in the casing 37 are disposed at the rear end portion of the lower surface of the loading platform 12, and strictly speaking, in the width direction of the loading platform 12, It is arranged at an intermediate position.

  The controller 30 corresponds to a control device that controls the operating state of the in-wheel motor 3, and includes a controller main body 31 and a memory 32 including a microcomputer and the like as main components. When the controller 30 receives the command signal transmitted from the PAS module 34, the controller 30 turns on the in-wheel motor 3. More specifically, the controller 30 receives power from the battery 4 and starts up when a power switch 38 provided on the operation panel 36 is turned on. When the controller 30 in the activated state receives a command signal from the PAS module 34, the controller 30 controls a control circuit 35 provided to switch the energized state between the battery 4 and the in-wheel motor 3. Thereby, the energization state between the battery 4 and the in-wheel motor 3 becomes an energization-on state, and the in-wheel motor 3 operates. At this time, the in-wheel motor 3 operates with an output corresponding to the magnitude of the torque detected by the torque sensor 33, and rotates the motorized wheel 15 in the direction in which the vehicle body 11 moves forward.

  In the present embodiment, as described above, the controller 30 and the PAS module 34 are disposed at the rear end portion of the lower surface of the loading platform 12 and are separated from the in-wheel motor 3 disposed at the front end portion of the lower surface of the loading platform 12. In the position. According to such a positional relationship, it is possible to suppress an increase in the size of the electric assist cart 1 as a whole compared to a configuration in which these devices are arranged together. Further, as shown in FIG. 3, the controller 30, the PAS module 34, and the in-wheel motor 3 are arranged at positions that fit inside the outer edge of the loading platform 12. Thereby, the size of the electric assist cart 1 can be further reduced. In addition, since the main body 2 retains the appearance before the above-described devices (the controller 30, the PAS module 34, and the in-wheel motor 3) are attached, the function and ease of use as a bogie (ease of use) ) Is not impaired. That is, the electric assist cart 1 according to the present embodiment is equipped with the electric assist function without affecting the function as the cart.

  By the way, in the memory 32 included in the controller 30, set values for conditions relating to the control of the in-wheel motor 3 are set. These values are appropriately referred to by the controller main body 31 when the electric assist is activated. More specifically, the memory 32 stores two set values as shown in FIG. 9. One set value is a torque threshold value (denoted by the symbol TR in FIG. 9). The set value is a time set as the activation time of the electric assist (indicated as symbol SE in FIG. 9, hereinafter also referred to as set time).

  The torque threshold is a value set as a condition when the torque sensor 33 outputs a signal to the PAS module 34 and is reflected in torque detection by the torque sensor 33. That is, it can be said that the value stored in the memory 32 as the torque threshold is a value set as the trigger condition for the electric assist.

  On the other hand, when the in-wheel motor 3 is operated, the controller 30 measures the elapsed time from that point, and stops the in-wheel motor 3 when the elapsed time reaches the set time. As described above, in the present embodiment, when the user presses the handle 16, the torque acting on the handle 16 (strictly, the shaft portion 16b provided at the lower end portion of the extending portion 16a) is equal to or greater than the threshold value. When detected, the in-wheel motor 3 is actuated using this as a trigger, and then the in-wheel motor 3 is stopped when the set time stored in the memory 32 has elapsed. Thus, the electric assist effect can be obtained only during a period when the load when the electric assist cart 1 is moved forward is relatively large, such as when the electric assist cart 1 in a stationary state starts to move forward or when the electric assist cart 1 moves up the slope. become.

  Note that the two setting values described above can be changed, and an operation panel 36 is provided as a device that receives an operation (change operation) performed by the user to change the setting value. When a change operation is accepted on the operation panel 36, the set value is changed according to the operation content. Then, the controller 30 (specifically, the controller main body 31) updates the setting value stored in the memory 32 to the setting value after the change. Since each set value can be changed in this manner, the set value can be reviewed as appropriate in consideration of the user's physique, arm strength, and the like, and the usability for the user can be improved.

  Note that the specific configuration of the operation panel 36 is not particularly limited, and it is desirable that the operation can be easily changed and is compact. Incidentally, as shown in FIG. 8, the operation panel 36 according to the present embodiment includes a push button for accepting a change operation, and is disposed on a portion of the handle 16 that is gripped by the user (that is, disposed between the extension portions 16 a). Attached).

  Further, the set value that can be changed is not limited to the torque threshold value and the activation time of the electric assist, but other set values such as the output value of the in-wheel motor 3 may be changed. If the output value of the in-wheel motor 3 can be changed, an optimal assist effect can be obtained according to the load on the loading platform 12.

Next, the control flow of the electric assist will be described with reference to FIG.
The electric assist is activated when the electric assist cart 1 in a stationary state is moved. At this time, a load is placed on the loading platform 12, and the movable stopper 20 is in a travel-permitted state. In using the electric assist effect, the user turns on the power switch 38 provided on the operation panel 36 (S001). It should be noted that while the power switch 38 is off, the electric assist effect is naturally not exhibited, and the electric assist cart 1 is used as a normal cart.

  When the user holds the upper end portion of the handle 16 and pushes it forward, the electric assist cart 1 is provided in the extending portion 16a of the handle 16 when the electric assist cart 1 is held stationary. The torque acting on the shaft portion 16b is increased. The torque sensor 33 detects the torque, and when the torque sensor 33 detects a torque equal to or greater than the threshold, the torque sensor 33 outputs a signal to the PAS module 34 (S002).

  When receiving the output signal from the torque sensor 33 (S003), the PAS module 34 generates a command signal to command the controller 30 to start the motor, and transmits the command signal to the controller 30 (S004). Upon receiving the command signal (S005), the controller 30 activates the in-wheel motor 3 through the control circuit 35 (S006). As a result, the electric assist is activated, and the electric assist cart 1 that has been stationary until then starts to move forward in response to the pushing operation and electric assist by the user.

  When the electric assist cart 1 starts to move, the rolling resistance between the wheels 13, 14, 15 and the ground decreases. On the other hand, the urging force by the coil spring 19 attached to the lower end portion is applied to the extending portion 16 a of the handle 16. Here, the direction of the urging force by the coil spring 19 is opposite to the direction in which the torque acts. Therefore, after the electric assist cart 1 starts to move, the rolling resistance decreases, and finally, the torque exceeding the urging force by the coil spring 19 is not detected.

  Further, the controller 30 measures the elapsed time after the torque sensor 33 detects the torque equal to or greater than the threshold, and stops the operation of the in-wheel motor 3 when the elapsed time reaches the set time (S007, 008). ). Thereby, the electric assist is interrupted. As described above, the electric assist is interrupted when the set time has elapsed from the time when the torque exceeding the threshold is detected. After the electric assist cart 1 starts moving, the wheels 13, 14, 15 and the ground are This is because the electric resistance cart 1 is moved forward with a relatively small pushing force. That is, in the present embodiment, while the power switch 38 is on, the electric assist is not always activated, but only during a period when the electric assist is necessary. As a result, an appropriate assist effect can be obtained without requiring a safety device for preventing a malfunction (for example, erroneous traveling of the carriage) that can be caused by always activating the electric assist.

  In addition, after the operation of the in-wheel motor 3 stops, when the torque sensor 33 again detects a torque equal to or greater than the threshold value, for example, when the electric assist cart 1 moves up the slope, the above steps S002 to S008 are repeated. That is, every time the torque sensor 33 detects a torque equal to or greater than the threshold value, the activation / interruption of the electric assist is repeated.

  Although the above embodiment has been described as an example of the configuration of the electric assist cart according to the present invention, other configurations (embodiments) that can achieve the effects of the present invention are also conceivable. For example, in the above embodiment, the torque sensor 33 is used as a detector that detects a reaction force acting on a predetermined portion of the handle 16 when the handle 16 is pressed by the user. However, the present invention is not limited to this. Any device that can detect the reaction force described above can be used without limitation.

  Further, in the above embodiment, the controller 30 and the PAS module 34 are provided in a place away from the in-wheel motor 3, but the present invention is not limited to this, and these devices are gathered. It may be provided. In addition, about the arrangement position of the apparatus (especially control-related apparatus) which comprises the electrically assisted trolley | bogie 1, it is not limited to the arrangement position in said embodiment, It can be set as arbitrary positions.

  Further, the number of each device such as the number of wheels 13, 14, 15 provided in the vehicle body 11 and the number of the batteries 4 is not particularly limited, and can be an arbitrary number.

  In the above embodiment, the movable stopper 20 is provided. However, the present invention is not limited to this, and the movable stopper 20 may be omitted.

1 Electric assist cart 2 Cart body 3 In-wheel motor (electric motor)
4 Battery 11 Car body 12 Loading platform 13 Front wheel 14 Rear wheel 15 Wheel with motor (wheel)
16 Handle 16a Extension part 16b Shaft part 17 Handle mounting bracket 18 Connecting member 19 Coil spring 20 Movable stopper 21 Adjuster 22 Pedal part 23 Lock part 30 Controller (control device)
31 Controller body 32 Memory 33 Torque sensor (detector)
34 PAS module (signal generator)
35 Control circuit 36 Operation panel 37 Casing 38 Power switch

Claims (7)

A vehicle body having a loading platform and wheels attached to the loading platform;
A handle attached to the vehicle body and pushed by a user when the vehicle body is advanced;
An electric motor attached to the vehicle body and rotating to assist the rotation of the wheel;
A control device for controlling the operating state of the electric motor;
A detector for detecting a reaction force acting on a predetermined portion of the handle when the handle is pushed by the user;
The control device operates the electric motor when the detector detects the reaction force equal to or greater than a preset threshold value, and is set in advance after the detector detects the reaction force equal to or greater than the threshold value. An electric assist cart, wherein the electric motor is stopped when time elapses. The handle is attached to the loading platform via a shaft portion provided at a lower end portion of the extending portion extending in the vertical direction,
The detector is a torque sensor that detects torque acting on the shaft portion when the handle is pushed by the user;
The torque sensor outputs a signal when detecting the torque equal to or greater than the threshold,
When the output signal from the torque sensor is received, the control device further includes a signal generation device that generates a command signal for operating the electric motor and transmits the command signal to the control device. The electric assist cart according to claim 1.   The electric assist according to claim 2, wherein a biasing member that applies a biasing force to the handle in a direction opposite to a direction in which the torque acts is attached to a lower end portion of the extension portion. Trolley. The control device and the signal generation device are provided on one end side in the front-rear direction of the cargo bed,
The electric assist cart according to claim 2, wherein the electric motor is provided on the other end side in the front-rear direction of the loading platform.   5. The electric assist cart according to claim 4, wherein the control device, the signal generation device, and the electric motor are arranged at a position that fits inside an outer edge of the cargo bed. The control device includes a memory that records setting values of the threshold value and the time,
An operation panel for receiving an operation performed by the user to change a setting value of at least one of the threshold and the time;
6. When the operation panel accepts the operation, the control device updates the at least one setting value stored in the memory to a changed setting value. The electric assist cart as described in the item. Having a movable stopper attached to the cargo bed in a state capable of moving up and down;
When the movable stopper is at the lower end position in the moving range of the movable stopper, the wheel abuts on the grounding surface that is in contact with the ground, and when the movable stopper is at the upper end position in the moving range, the movable stopper is separated from the grounding surface. The electric assist cart according to claim 1, wherein the electric assist cart is provided.

Images