JP2022121216A - Transport carriage - Google Patents

Abstract

To provide a transport carriage with high operability, capable of easily climbing over even a step-off part on a road surface.SOLUTION: A transport carriage 100 is an electrically-driven transport carriage. The transport carriage 100 includes: a loading space 1; a wheel 2 provided at the central part in the cross direction downward of the loading space 1; a lifting wheel 3 provided at each of the front and the rear downward of the loading space 1; and a lifter 4 provided between the lifting wheel 3 and the loading space 1. The wheel 2 is operated by an electric motor 21 provided downward of the loading space 1. The lifting wheel 3 lifts up and down by a telescopic motion of the lifter 4.SELECTED DRAWING: Figure 1

Description

The present invention relates to a carriage.

At construction sites, there are many steps on the floor (road surface) during construction, so steel ramps are used to eliminate the steps when transporting goods such as materials using a trolley. .
However, steel slopes are heavy and difficult to handle on site and difficult to use. In addition, since the movement route when using the slope is limited, the carriage tends to be forced to move over the step without using the movement route passing through the slope. In this case, the load is likely to collapse due to the impact when going over the step.
2. Description of the Related Art Conventionally, the technology disclosed in Patent Document 1 is known as a carriage for moving on a road surface having steps. The carriage of Patent Document 1 has four lifting jacks that lift and support the loading platform on the front, back, left and right of the lower part of the base (loading platform), and eight wheel lifting units that can move the wheels up and down and fix the vertical position. and

JP-A-2000-071998

However, the carrier of Patent Literature 1 needs to be equipped with many lifting jacks and wheel elevating units. For this reason, the configuration of the carriage is complicated, and the operation becomes complicated when moving on a road surface having steps. In addition, the relatively heavy carriage must be moved manually.
SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems and to provide a carriage with good operability, which can easily get over even if there is a step on the road surface.

The inventors of the present invention have developed a carrier that can be used at construction sites by providing lifting wheels and grounding sensors at the bottom, front and rear of the loading platform, so that when there is a step on the road surface, the grounding sensor can be used. The present invention has been made by paying attention to the fact that the lifting wheels can be reliably grounded while measuring the distance between the road surface and the loading platform so that the vehicle can be ridden over.
In order to solve the above problems, the present invention is an electric carriage. The truck includes a loading platform, wheels provided in the center in the front-rear direction below the loading platform, elevating wheels provided respectively at the front and rear parts below the loading platform, and between the elevating wheels and the loading platform. and an elevator provided in the The wheels are actuated by an electric motor provided below the cargo bed. The elevating wheels are moved up and down by extension and contraction of the elevator.
In the present invention, when there is a level difference on the road surface, the loading platform can be stably moved up and down to overcome the level difference by providing lifting wheels in front and behind the wheels and lifting and lowering them by means of an elevator. Also, the cart can be moved by actuating the wheels with the electric motor. Therefore, according to the present invention, it is possible to provide a carriage with good operability that can easily overcome even if there is a step on the road surface.
Further, it is preferable that ground contact sensors for detecting contact of the lifting wheels with the road surface are respectively provided at the front portion and the rear portion below the loading platform.
With such a configuration, the front and rear elevating wheels can be reliably grounded, so that stable movement of the carriage can be realized, and the safety of the transportation work can be improved.
Further, it is preferable that an inclinometer is attached to the loading platform, and that rotation of the wheels is locked to stop the electric motor when the inclinometer detects an abnormal value.
With such a configuration, when the clinometer detects that the degree of inclination of the cargo bed is abnormal, the wheels are locked and the electric motor is stopped. As a result, for example, even when the road surface is sloping or when going over a step, it is possible to adjust the loading platform so as to keep it horizontal, thereby preventing the load from collapsing or overturning, thereby improving the safety of the transportation work. Specifically, the platform can be kept horizontal by moving the position of the carriage onto a horizontal road surface or raising and lowering the elevating wheels.

According to the present invention, it is possible to provide a carriage with good operability that can easily get over even if there is a step on the road surface.

It is a figure which shows the perspective method which looked at the carriage which concerns on embodiment of this invention from the side. It is a perspective view of the carriage according to the embodiment of the present invention as viewed obliquely from the upper front right. It is a perspective view of the carriage according to the embodiment of the present invention as seen from diagonally below left. FIG. 4 is an enlarged perspective view of the vicinity of the operation unit when the carriage according to the embodiment of the present invention is viewed from the rear; It is a schematic diagram which shows the example which crosses an upward step using the carriage which concerns on embodiment of this invention. FIG. 5B is a schematic diagram continued from FIG. 5A showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 5C is a schematic diagram continued from FIG. 5B showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 5D is a schematic diagram continued from FIG. 5C showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 5C is a schematic diagram continued from FIG. 5D showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 5D is a schematic diagram continued from FIG. 5E showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 5F is a schematic diagram continuing from FIG. 5F showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; It is a schematic diagram which shows the example which crosses an upward step using the carriage which concerns on embodiment of this invention. FIG. 6B is a schematic diagram continuing from FIG. 6A showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 6C is a schematic diagram continued from FIG. 6B showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 6D is a schematic diagram continued from FIG. 6C showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 6D is a schematic diagram continued from FIG. 6D showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 6E is a schematic diagram continuing from FIG. 6E showing an example of crossing an upward step using the carriage according to the embodiment of the present invention; FIG. 6F is a schematic diagram continuing from FIG. 6F showing an example of crossing an upward step using the carriage according to the embodiment of the present invention;

The present invention is an electric carriage provided with wheels in the center of the lower side of a loading platform, lifting wheels in the front and rear parts, and a plurality of ground sensors below, in front and behind the loading platform. is.
Hereinafter, embodiments of the present invention will be described with reference to the drawings as appropriate. In addition, in the drawings shown below, the same or similar members are denoted by the same reference numerals, and overlapping descriptions are omitted as appropriate. Also, the sizes and shapes of members may be deformed or exaggerated for the sake of explanation.
FIG. 1 is a perspective view of a carriage 100 according to an embodiment of the present invention as seen from the left side. The carriage 100 according to the present embodiment is an electric carriage that can travel over steps S1 and S2 (see FIGS. 5A and 6A) on the road surface R of a construction site. In the following description, the up, down, left, right, front and back directions are set to the respective directions seen from the operator M (see FIG. 5A, the same applies hereinafter) during normal transportation work, as shown in FIGS. 1 to 4.

As shown in FIG. 1 , the carrier 100 according to the present embodiment includes a loading platform 1 , wheels 2 , lifting wheels 3 , and an elevator 4 . The wheels 2 are provided at the center in the front-rear direction below the loading platform 1 . Elevating wheels 3 are provided at the front and rear portions below the loading platform 1, respectively. That is, the elevating wheels 3 are provided in front of and behind the wheels 2, respectively. The elevator 4 is provided between the lifting wheels 3 and the loading platform 1 .

FIG. 2 is a perspective view of the carriage 100 according to the embodiment of the present invention as seen obliquely from the upper front right. As shown in FIG. 2, on the left and right sides of the rear edge of the loading platform 1, pipe-shaped handles 11 are erected to be gripped by the worker M during transportation work. At the front edge, the left edge and the right edge of the loading platform 1, flaps 12 are vertically installed to prevent the objects B such as materials on the loading platform 1 from falling (see FIG. 5, the same shall apply hereinafter). Each is rotatably provided. A plurality of recesses 13 are formed on the upper surface of the loading platform 1 . Since the worker M can put his or her hand into the recess 13, loading and unloading of the material to be transported B onto and from the loading platform 1 is facilitated. A rear plate 14 is provided on the rear edge of the loading platform 1 so as to stand vertically. The rear plate 14 is provided so as to cover the rear side of the space above the loading platform 1. - 特許庁
When lashing the goods B, the hooks 16 attached to the flaps 12 and the openings 17 provided on the bottom surface of the recess 13 are used to bind the goods B with packing strings or the like. An opening 17 is provided in part of the bottom surface of the recess 13 . The operator M places the object to be transported B on the loading platform 1, raises the flaps 12 provided on the side edge of the loading platform 1, and places the object B on the hooks or openings provided on the flapping plate 12. The load is prevented from collapsing by tying it with a packing string passed through 17. - 特許庁In addition, the opening 17 may be provided in a part of the side surface forming the recess 13 .

A box 5 for storing a battery 51 is installed at the rear part of the carrier 1 . Battery 51 is rechargeable. Also, the battery 51 can be used as a power source even in a place near a construction site where power is not available. Inside the box 5, an inclinometer 55 is installed to detect the degree of inclination of the loading platform 1 with respect to the horizontal plane. As the tilt meter 55, for example, a weight suspended in the direction of gravity, or a pendulum or float type tilt sensor that detects the deviation between the liquid surface and the tilted object can be used, but the tilt meter 55 is not particularly limited. A control circuit board 56 for controlling each part of the carriage 100 is arranged inside the box 5 . An indicator light 52 is attached to the upper surface of the box 5 . The indicator lamps 52 include a normal indicator lamp 53 that normally lights up in green, for example, and a caution indicator lamp 54 that lights up in yellow, for example, when calling attention. On the upper side of the back plate 14, an operation unit 6 for inputting operation instructions and the like to the carriage 100 and displaying information is installed. Note that the installation position of the operation unit 6 can be changed as appropriate.

FIG. 3 is a perspective view of the carriage 100 according to the embodiment of the present invention as viewed obliquely from the lower left. As shown in FIG. 3, the wheels 2 are driven by an electric motor 21 provided below the loading platform 1. As shown in FIG. A drive shaft 22 of the wheel 2 is rotatably supported by a support frame 23 fixed to the bottom surface of the loading platform 1 via a bearing 24 . The rotational driving force of the electric motor 21 is transmitted to the drive shaft 22 via a transmission mechanism 25 having gears and the like. The electric motor 21 can electrically brake the rotating shaft of the electric motor 21 . In addition, the electric motor 21 is configured such that the rotary shaft of the electric motor 21 is mechanically braked by the action of a spring, for example, when the electric motor 21 is not energized. A DC brushless motor, for example, can be used as the electric motor 21, but it is not particularly limited, and other types of servo motors, for example, may be used. The wheels 2 are provided on the left and right sides of the front portion of the lower surface of the support frame 23 . The number of wheels 2 attached to the drive shaft 22 is not limited, and may be one or three or more. Driven wheels 26 that are rotatable in contact with the road surface R are provided on the left and right sides of the rear portion of the lower surface of the support frame 23 .

The elevating wheels 3 are lifted and lowered by the elongation and contraction of the elevator 4 . The elevator 4 includes an upper frame 41 fixed to the lower surface of the loading platform 1, a lower frame 42 to which the lifting wheels 3 are fixed to the lower surface, and an expansion mechanism 43 capable of adjusting the separation distance between the upper frame 41 and the lower frame 42. It has The expansion mechanism 43 has a pair of link members 43a and 43b that are crossed in an X shape and rotatably connected at the crossing portion. That is, the elevator 4 is an X-link type jack in this embodiment. However, as the elevator 4, another type of elevator such as a pantograph jack may be used. An end of the upper frame 41 is provided with an input shaft 44 that is rotated when the elevator 4 is extended or retracted. 3, only the input shaft 44 of the elevator 4 on the front side is illustrated. The input shaft 44 is actuated by a rotary drive means 45 such as an electric impact wrench. In this embodiment, two elevating wheels 3, 3 on the left and right are attached to one elevating machine 4. As shown in FIG. In addition, the number of elevator wheels 3 attached to one elevator 4 is not limited, and may be one or three or more.

Ground sensors 31 for detecting contact of the lifting wheels 3 with the road surface R, that is, grounding, are respectively provided at the front and rear portions of the lower part of the loading platform 1 . Specifically, the ground sensor 31 is attached to the lower frame 42 of the elevator 4 . In FIG. 3, the ground contact sensor 31 is fixed to the lower surface of the lower frame 42 near the left elevating wheel 3, but it is not limited to this. The ground sensor 31 measures the distance from the ground sensor 31 to the road surface R. As the ground sensor 31, for example, a ToF (time of flight) type laser distance sensor using an IR laser can be used. However, the ground sensor 31 may also be other types of non-contact or contact distance sensors, such as, for example, ultrasonic sensors. If the measured value of the ground sensor 31 is greater than the distance from the ground sensor 31 to the lower end of the lift wheel 3 (the portion in contact with the road surface R), that is, the mounting height of the ground sensor 31, the lift wheel 3 is not grounded. I know.

FIG. 4 is an enlarged perspective view of the vicinity of the operation unit 6 when the carriage 100 according to the embodiment of the present invention is viewed from the rear. As shown in FIG. 4 , a main power button 15 for turning on/off the power supply from the battery 51 to each part of the carriage 100 is installed on the rear surface of the back plate 14 . Note that the installation position of the main power button 15 can be changed as appropriate.

The operation unit 6 includes a travel operation unit 7 and an operation display unit 8 . An operation lever 71 is provided in the travel operation unit 7 . When the operating lever 71 is at the P (lower) position in FIG. 4, the rotating shaft of the electric motor 21 is electrically braked and the rotation of the wheels 2 is locked. When the operating lever 71 is at the N (center) position in FIG. 4, the electrical brake on the rotary shaft of the electric motor 21 is released. However, when the power is turned off by the main power button 15, the rotating shaft of the electric motor 21 is mechanically braked and the rotation of the wheels 2 is locked. When the operating lever 71 is at the D (upper) position in FIG. 4, the electric brake applied to the rotating shaft of the electric motor 21 is released and the electric motor 21 is driven. As a result, the wheels 2 are rotated and the movement of the carriage 100 is assisted. When the operating lever 71 is at the D position and the operator releases the operating lever 71, the operating lever 71 returns to the N position. As a result, the assist effect is terminated and the electric motor 21 is stopped. On the other hand, when the operating lever 71 is at the P position, even if the operator releases the operating lever 71, the operating lever 71 is held at the P position.

The operation display unit 8 is provided with a front wheel up operation button 81 , a front wheel down operation button 82 , a rear wheel up operation button 83 and a rear wheel down operation button 84 . While the front wheel up operation button 81 is being pushed, the front elevator 4 is contracted, so that the front elevator wheels 3 are raised. lift wheel 3 is lowered. While the rear wheel up operation button 83 is being pushed, the rear elevator 4 is contracted to raise the rear elevator wheel 3, and while the rear wheel lowering operation button 84 is being pushed, the rear elevator 4 is in operation. is extended, the elevating wheel 3 on the rear side descends.

Further, the operation display section 8 is provided with a display section 85 having a plurality of indicator lamps for displaying the status of the carriage 100 . When the inclinometer 55 detects an abnormal value, for example, when the degree of inclination of the cargo bed 1 with respect to the horizontal plane exceeds a specified value, the caution indicator lamp 54 lights up and the corresponding indicator lamp in the display section 85 lights up. Here, different indicator lamps light depending on whether the front side of the loading platform 1 is lower than the rear side or the front side is higher than the rear side. Further, when the inclinometer 55 detects an abnormal value, the cart 100 locks the rotation of the wheels 2 and stops the electric motor 21 . Specifically, the rotating shaft of the electric motor 21 is electrically braked to lock the rotation of the wheels 2 and stop the driving of the electric motor 21 . The specified value of the degree of inclination of the loading platform 1 when the rotation of the wheels 2 is locked and the electric motor 21 is stopped is one step larger than the specified value when the caution indicator lamp 54 and the indicator lamp are illuminated. may be set as When the ground contact sensor 31 detects that the lift wheels 3 are not in contact with the road surface R, that is, the lift wheels 3 are not in contact with the ground, the warning indicator lamp 54 lights up, and the corresponding indicator lamp in the display section 85 turns on. Light. Here, different indicator lamps are lit depending on whether the front elevating wheel 3 is not in contact with the ground or when the rear elevating wheel 3 is not in contact with the ground.

Next, the operation of the carriage 100 configured in this way will be described.
First, with reference to FIGS. 5A to 5G, an example of using the carriage 100 according to the present embodiment to go over an upward step S1 will be described.
As shown in FIG. 5A, the worker M advances the carriage 100 on the low road surface R1 of the road surface R and stops it before the upward step S1. At this time, both the front and rear elevating wheels 3 are at the reference position where all the wheels 2 and the elevating wheels 3 are grounded. Subsequently, as shown in FIG. 5B, the worker M pushes the front wheel raising operation button 81 to retract the front elevator 4, thereby raising the front elevator wheels 3. As shown in FIG. The ascending distance of the front elevating wheel 3 is set to the same value as the height of the step S1 on the uphill side. Subsequently, as shown in FIG. 5C, the worker M slightly advances the carriage 100, and stops when the front elevating wheel 3 crosses the uphill step S1 and reaches the high road surface R2 of the road surface R. . Subsequently, as shown in FIG. 5D, the worker M pushes the front wheel lowering operation button 82 to extend the front elevator 4 and pushes the rear wheel lowering operation button 84 to extend the rear elevator 4, thereby lowering the loading platform 1. Raise it while keeping it horizontal. The operation display unit 8 is provided with a button for simultaneously lowering the front elevator wheel 3 and the rear elevator wheel 3 by the same distance by simultaneously extending the front elevator 4 and the rear elevator 4 by the same amount. may be In this way, the loading platform 1 can be lifted while being kept more horizontal. The lifting distance of the loading platform 1 is set to the same value as the height of the step S1 on the uphill side, and the front elevating wheel 3 is at the reference position. Subsequently, as shown in FIG. 5E, the operator M moves the carriage 100 forward a little, and stops when the wheels 2 cross the uphill step S1 with the rear elevating wheels 3 on the low road surface R1. . Subsequently, as shown in FIG. 5F, the operator M pushes the rear wheel raising operation button 83 to retract the rear elevator 4, thereby raising the rear elevator wheels 3 to the reference position. Then, as shown in FIG. 5G, when the operator M advances the carriage 100, the entire carriage 100 climbs over the uphill step S1 and moves onto the high road surface R2.

Next, with reference to FIGS. 6A to 6G, an example of using the carriage 100 according to the present embodiment to go over the downward step S2 will be described.
As shown in FIG. 6A, the worker M advances the carriage 100 on the high road surface R2 of the road surface R and stops it before the downward step S2. At this time, both the front and rear elevating wheels 3 are at the reference position. Subsequently, as shown in FIG. 6B, the worker M slightly advances the carriage 100 and stops when the front elevating wheel 3 crosses the downward step S2 while the wheel 2 is on the high road surface R2. Subsequently, as shown in FIG. 6C, the worker M pushes the front wheel lowering operation button 82 to extend the front elevator 4, thereby lowering the front elevator wheel 3 and grounding it on the low road surface R1. The descending distance of the front elevating wheel 3 is set to the same value as the height of the down step S2. Subsequently, as shown in FIG. 6D, the worker M moves the carriage 100 forward a little, and stops when the wheels 2 cross the step S2 on the downhill while the rear elevating wheels 3 are on the high road surface R2. . Subsequently, as shown in FIG. 6E, the worker M pushes the front wheel up operation button 81 to retract the front elevator 4 and pushes the rear wheel up operation button 83 to retract the rear elevator 4, thereby lifting the cargo bed 1. Lower while keeping it horizontal. The operation display unit 8 is provided with a button for simultaneously raising the front elevator wheel 3 and the rear elevator wheel 3 by the same distance by simultaneously retracting the front elevator 4 and the rear elevator 4 by the same amount. may be In this way, the loading platform 1 can be lowered while being kept more horizontal. The lowering distance of the loading platform 1 is set to the same value as the height of the downhill step S2, and the front elevating wheel 3 is at the reference position. Subsequently, as shown in FIG. 6F, the operator M slightly advances the carriage 100 and stops when the rear elevating wheels 3 go over the downward step S2. Then, as shown in FIG. 6G, the operator M pushes the rear wheel lowering operation button 84 to extend the rear elevator 4, thereby lowering the rear elevator wheel 3 and grounding it on the low road surface R1. The lowering distance of the rear lifting wheel 3 is set to the same value as the height of the downhill step S2. As a result, the carriage 100 as a whole climbs over the downward step S2 and moves onto the low road surface R1.

As described above, the carriage 100 according to this embodiment is an electric carriage. The carriage 100 includes a loading platform 1, wheels 2 provided in the center in the front-rear direction below the loading platform 1, lifting wheels 3 provided respectively at front and rear parts below the loading platform 1, lifting wheels 3 and the loading platform 1. and an elevator 4 provided between. The wheels 2 are operated by an electric motor 21 provided below the loading platform 1 . The elevating wheels 3 are lifted and lowered by the elongation and contraction of the elevator 4 .
In this embodiment, elevating wheels 3 are provided in front of and behind the wheels 2, respectively, and lifted by the elevator 4, so that when there are steps S1 and S2 on the road surface R, the loading platform 1 can be stably raised and lowered. S1 and S2 can be overcome. Moreover, the wheels 2 can be operated by the electric motor 21 to move the carriage 100 .
Therefore, according to the present embodiment, it is possible to provide the carriage 100 with good operability, which can easily get over even if there are steps S1 and S2 on the road surface R.

Further, ground sensors 31 for detecting contact of the lifting wheels 3 with the road surface R are provided respectively at the front and rear portions below the loading platform 1 . With such a configuration, the front and rear lifting wheels 3 can be reliably grounded, so that stable movement of the carriage 100 can be realized, and the safety of the transportation work can be improved.

An inclinometer 55 is attached to the loading platform 1 , and when the inclinometer 55 detects an abnormal value, the cart 100 locks the rotation of the wheels 2 and stops the electric motor 21 .
In such a configuration, when the clinometer 55 detects that the degree of inclination of the cargo bed 1 is abnormal, the wheels 2 are locked and the electric motor 21 is stopped. As a result, for example, even when the road surface R is slanted or when the steps S1 and S2 are crossed, it is possible to adjust the loading platform 1 so as to keep it horizontal, thereby preventing the load from collapsing and falling, thereby ensuring the safety of the transportation work. improve sexuality. Specifically, the platform 1 can be kept horizontal by moving the carriage 100 onto a horizontal road surface R or raising and lowering the lifting wheels 3 .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be appropriately modified without departing from the scope of the invention.
For example, in the above-described embodiment, the case where the carriage 100 is used at a construction site has been described, but the present invention is not limited to this. The carriage of the present invention can be used for various transportation operations such as transportation of machines such as office equipment and furniture such as chests of drawers.
Further, in the above-described embodiment, with reference to FIGS. 5A to 5G and FIGS. 6A to 6G, an example of crossing the steps S1 and S2 using the carriage 100 has been described, but the present invention is not limited to this example. do not have. For example, the ascending distance of the front elevating wheels 3 in FIG. 5B may be set slightly larger than the height of the step S1 on the uphill. However, in this case, it is necessary to lower the front elevating wheel 3 in FIG. 5C to touch the high road surface R2.
In the above embodiment, the trolley 100 is provided with the ground contact sensor 31 and the inclinometer 55, but the operator M determines the degree of inclination of the loading platform 1, so that the inclinometer 55 is not provided. In some cases. Further, the degree of inclination of the loading platform 1 may be determined by the ground contact sensor 31 without being limited to the inclinometer 55 .

100 Carriage 1 Carrier 2 Wheels 3 Elevating wheels 31 Ground sensor 4 Elevator 5 Box 55 Inclinometer 21 Electric motor R Road surface R1 Low road surface R2 High road surface S1, S2 Level difference

Claims (3)

An electric carriage,
a loading platform, wheels provided at a central portion in the front-rear direction below the loading platform, elevating wheels provided at front and rear portions below the loading platform, and an elevator provided between the elevating wheels and the loading platform. , and
The wheels are operated by an electric motor provided below the cargo bed,
A carrier vehicle, wherein the elevating wheels are lifted and lowered by extension and contraction of the elevating machine. 2. The trolley according to claim 1, wherein ground sensors for detecting contact of said elevating wheels with a road surface are provided respectively at the front and rear portions below said loading platform. An inclinometer is attached to the loading platform,
3. The carrier according to claim 1, wherein when said inclinometer detects an abnormal value, rotation of said wheels is locked and said electric motor is stopped.

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