JP6491913B2 - Electric two-wheel cart - Google Patents

Description

  The present invention relates to an electric two-wheel cart that is pulled by a person and carries a load.

In large-scale fish markets where the passages between the products are narrow and the products need to be moved frequently with small mouths, two small wooden carts (large eight cars) are used to transport tuna and other products. Or a small car).
The cart has a height of about 50 cm and is lower than a person's waist, so it is easy to load and unload luggage, and since it is a two-wheeler, it can be turned slightly, so it is very convenient for unloading in a narrow place.
However, since it is transported by human power, it requires a lot of labor and it is difficult to climb the inclined surface.Because it is a two-wheeled vehicle, the balance between the front and rear is unstable and the load collapses easily. There are difficulties such as the possibility of becoming.

On the other hand, the cart which rotates a wheel with a motor is disclosed by the following patent document 1. FIG. In this invention, since there is only one wheel in the center of the loading platform, the stability of the loading platform must be ensured by the caster wheels provided on the left and right of the front side of the wheel, but there is an advantage that the load can be easily transported by the power of the motor.
However, in the present invention, it is impossible to load and unload luggage from the rear side by grounding the rear side of the loading platform. Therefore, in order to frequently load and unload heavy luggage such as tuna as is done in the fish market. Not suitable. In addition, if the load is placed behind the wheels, the caster wheel in front of the load will float up and the loading platform will become very unstable, and there is a risk that a load drop accident will occur.

JP-A-8-207774

  Therefore, the present invention eliminates the effort for towing with the power of the motor while taking advantage of the ease of loading and unloading of the load of a conventional cart such as the large eight car and the small turning at the time of transport, and a loading platform peculiar to a motorcycle. It is an object of the present invention to provide an electric two-wheel cart that can prevent a load from collapsing due to a steep slope and can carry a heavy load safely and easily.

  In order to achieve the above object, the electric two-wheel cart according to the present invention operates with a front handle provided in front of the cargo platform, with the cargo platform positioned higher than the wheels rotating around the axles of the left and right wheels. In a wheeled cart, in a lower space of the loading platform, a wheel driving motor and a transmission that are rotatably mounted on the axle and a battery that supplies electricity to the motor are provided, and the motor and the battery are installed on the front handle. There is an operating unit that electrically controls the start, stop, and rotation speed of the wheels, and the front side of the load platform has a height that can hold the load platform at an inclination that prevents the loaded load from sliding down when grounded. A stand is provided at the rear of the loading platform, and an auxiliary wheel having a height capable of holding the loading platform is provided at a slope at which the loaded load does not slide when grounded, and when the rear of the loading platform is grounded For wheel drive Characterized in that a folding mechanism is foldable into space defined by the rear side and the loading platform rear of the lower surface and ground wood.

  According to a second aspect of the present invention, in the above invention, the folding mechanism pivotally supports a support rod that supports the auxiliary wheel at a pivotal support portion provided at a lower part of the loading platform so as to be able to reciprocate from below to the front. In addition, it is characterized in that a locking portion is provided which can maintain the stop below the support rod and maintain the stop above the support rod.

  According to a third aspect of the present invention, in the above invention, the support rod is provided with a manual lever for operating the auxiliary wheel to move up and down.

  According to a fourth aspect of the present invention, in the above invention, the auxiliary wheel is a driven swivel type caster wheel that automatically rotates rearward in the traveling direction.

  The invention of claim 5 is characterized in that, in the above invention, a differential gear is provided on the axle.

  The invention of claim 6 is characterized in that, in the above invention, the axle is provided with a clutch for switching between free rotation of the wheel and electric rotation by a motor and a clutch lever for switching the clutch.

The electric two-wheel cart according to the present invention is driven by the power of the motor not by human power but by the power of the battery while controlling the start / stop of the rotation of the wheel by the motor and the rotation speed by the operation unit while driving by holding the front handle. Therefore, even a heavy load can be transported, and driving operation becomes extremely easy.
During the transportation, the auxiliary wheel provided on the rear side of the loading platform is projected below the rear of the loading platform by the folding mechanism, so that the weight of the load is distributed and received between the auxiliary wheel and the two wheels in front of it. A person can lightly support the front handle and steer it, so that it can be transported in a stable state without causing the load to slip or collapse.
Also, when the cart is allowed to stand with the power turned off, regardless of whether the weight of the rear side or the front side of the loading platform increases, the loading platform is an auxiliary wheel on the rear side, a stand on the front side, Since it is held in an inclined position that is nearly horizontal and does not slide down, the load will not slip or collapse.
In addition, since the auxiliary wheel is folded under the loading platform by the folding mechanism, it is possible to easily load and unload heavy loads from the lower position of the lowered rear portion of the loading platform.
In addition, since the front handle is supported by a stand and is allowed to stand at a certain height away from the ground, the front handle can be naturally held without bending the foot when starting driving. It can be pulled easily in a comfortable posture with the handle slightly lifted.

In the invention of claim 2, when the auxiliary wheel is folded by rotating the support rod from the lower side to the front side and from the front side to the lower side, the auxiliary wheel is completely stored in a wide space under the loading platform. When the rear part can be grounded and the auxiliary wheel is opened downward, the auxiliary wheel protrudes greatly below the rear of the cargo bed and away from the wheel so that the cargo loaded on the cargo bed does not slide down. It can be held.
As a result, it is possible to further enhance the ease of loading and unloading of the luggage and the stability and safety of the cart when it is stationary and transported.

  According to the invention of claim 3, when switching the appearance of the auxiliary wheel, the hand is extended from the back of the cargo bed to grasp the manual lever, and the support rod is rotated from the front to the lower and the rotation from the lower to the front. The switching work is very easy because it can be done easily. And that work can be done without getting your hands dirty, so you don't get your hands on your load.

  In the invention of claim 4, since the auxiliary wheel is a follower turning type caster wheel, when the cart is turned, the caster wheel automatically turns in the turning direction, so even if a heavy load is loaded, the load is assisted. It is possible to turn the carrier easily by supporting it with a wheel.

  The invention according to claim 5 is provided with a differential gear on the axle, so that when the cart is turned, the axle is in a state where the auxiliary wheel is grounded or floated from the ground. The two wheels rotate in the opposite direction around the center of the wheel, making it possible to easily rotate and change direction.

  According to the sixth aspect of the present invention, it is possible to easily switch between free rotation of the wheel and electric rotation by the motor by operating the clutch lever, and by switching the wheel to free rotation even if the battery runs out of charge. The conveyance can be continued by human power without falling into the inability to run.

It is a perspective view which shows the state which made the auxiliary wheel of this invention protrude under the loading platform. It is a side view which shows the state which earth | grounded the protruded auxiliary wheel. It is a side view which shows the state which made the auxiliary wheel immerse under a loading platform, and raised the front handle. It is a side view which shows the state which made the auxiliary wheel protrude and the front handle was lowered. It is a side view which shows the state which made the auxiliary wheel protrude and the loading platform and the ground were made parallel. It is a bottom view which shows the state which made the auxiliary wheel protrude. It is a rear view which shows the principal part around the made auxiliary wheel protruded. It is the perspective view of the principal part which shows each state of the state which (a) protruded the auxiliary wheel, (b) the state in which the auxiliary wheel was in / out, and (c) the state in which the auxiliary wheel was immersed.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 2, the electric two-wheel cart of the present invention is a front handle that the driver has provided in front of the loading platform 11 while driving the left and right wheels 20 with the force of the motor 25 mounted below the loading platform 11. 13 is a cart that operates while balancing the front and rear of the loading platform 11 up and down around the axle 21 of the wheel 20, and an auxiliary wheel 40 that supports the loading platform 11 from below is provided at the rear of the cart. Is.

First, a description will be given of a main body portion of a cart which is an object of the present invention.
The main body of the cart is provided with a loading platform 11, and as shown in FIG. 1, the loading platform 11 is supported from below by a support frame 12 so as to be above the upper end of the wheel 20.
As shown in FIG. 6, the support frame 12 supports a rectangular loading platform 11, and therefore includes an upper left and right parallel support frame 12 a made of metal pipes and a left and right parallel support frame 12 b that supports both wheels 20. It is a frame that is vertically coupled in parallel.
The bearing frames 22 and 22 are provided symmetrically on the support frames 12b for the wheels on both sides of the lower part, and an axle 21 that connects the centers of the wheels 20 and 20 is rotatably mounted.
As shown in FIG. 1, the loading platform 11 is arranged on the wheel 20 so that the upper end of the wheel 20 does not protrude onto the loading platform 11, so that a large amount of luggage can be loaded over the wheel 20. And to allow passage through narrow passages.
A front handle 13 having a width that can be inserted by a person integrated with the support frame 12 made of the metal pipe and a rear handle 14 having a width that cannot be inserted by a person are provided on the front side and the rear side of the loading platform 11, respectively.

  And as shown in FIG. 1, the stand 15 which fixed the base to the front side of the support frame 12b for the right and left wheels and the vicinity of the base of the front handle 13a under the loading platform 11 on the front side of the wheels 20, 20. Is provided.

Next, the structure for electrically driving will be described.
As shown in FIGS. 2 and 6, a motor 25 is connected to the axle 21 of the wheel 20 supported by the bearings 22 and 22 through a transmission 24 that transmits rotation.
The motor 25 is integrated with the transmission 24 and is arranged close to the front base plate 16a provided on the wheel support frame 12b. The motor 25 is electrically connected to the rear base plate 16b. The battery 26 for supplying is mounted.
In order for the driver to control the motor 25 while pulling the front handle 13, the front handle 13 gripped by the driver is linked to the motor 25 and the battery 26, and the rotation of the wheel 20 is started. An operation unit 30 for electrically controlling the stop and rotation speed is provided.

Next, the auxiliary wheel 40 provided in the rear part of the cart will be described.
As shown in FIG. 1, the auxiliary wheel 40 is disposed below the rear of the loading platform behind the wheel 20.
In that case, it is partitioned by the rear side of the wheel driving member on the upper side of the line B connecting the grounding portion indicated by the reference numeral 14b at the rear rear portion of the loading platform shown in FIG. 3 and the lower end portion 20a of the wheel 20 and the lower surface of the rear loading platform. From the space toward the rear lower part of the loading platform on the line A connecting the lower end portion 40a of the auxiliary wheel 40 and the lower end portion 20a of the wheel 20 when the loading platform 11 shown in FIG. A folding mechanism 59 is provided that allows the lower end portion 40a of the auxiliary wheel 40 to be retracted and maintain the protruding state (opened state) and the immersed state (folded state) of the auxiliary wheel 40.

The outline of the present invention has been described above. Next, the present invention will be described in more detail with specific examples.
First, the main body of the cart will be described.

  As shown in FIG. 1, the loading platform 11 provided in the main body of the cart is a hard PE that is processed into a rectangular shape having a thickness of 15 mm, a length of 1800 mm, and a width of 700 mm on a support frame 12 provided in parallel with a distance of 700 mm between left and right. As shown in FIG. 1, using a high-strength flat plate made of resin, on the horizontal frame 12c connected to the left and right support frames 12a for the loading platform that is strongly supported from below so as not to be deformed or broken by the weight of the load. Install with screws.

A load slip prevention body 11b is provided on the side of the loading platform 11.
The load slip prevention body 11b is formed, for example, by using a 15 mm-thick PE resin plate, which is the same as the load platform 11, to form an elongated rectangular flat plate having a length of 1800mm and a width of 100mm, and as shown in FIG. Overlap along the side and attach with screws.
In addition, as shown in FIG. 2, a diagonally upward load slip prevention body 11 a using a PE resin plate having a thickness of 15 mm, which is the same as the load bed 11, can be provided on the front side of the load bed 11. This anti-slip body 11a can prevent the tuna from sliding forward when the tuna head is piled forward, and the sharp heel sticking to the driver's back.
Since the left and right load slip prevention bodies 11a and 11b load and unload a load from above, it is difficult to exceed the load if it is excessively high. For this reason, it is recommended to select the optimum height according to the luggage to be handled.

On the front side of the support frame 12a for the loading platform, as shown in FIG. 1, a width of 700 mm for allowing a person to insert the left and right front side handles 13a having a length of 800 mm to be inserted between both sides forward. Then, the front handle 13 is installed at both ends of the side handle 13a.
The front side handles 13a may be parallel to each other, and may have a shape in which the middle swells outward as shown in FIG.

  In addition, the rear side handle 14a having a length of about 200 mm that does not allow a person to enter the rear side is bent at a bending angle of about 30 degrees obliquely upward and rearward at both ends of the rear part of the support frame 12a for the loading platform. The rear handle 14 is installed in a bent manner integrally with the rear handle 14a at the rear end of the rear handle 14a.

Further, as shown in FIG. 2, the support frames 12b, 12b for the wheels are symmetrically provided below the side portions of the left and right support frames 12a, 12a. The support frames 12a and 12b for the cargo bed are fixed vertically in parallel.
Then, as shown in FIG. 6, a horizontal frame 12d provided for reinforcement between the left and right support frames 12a for the loading platform and a horizontal frame 12d provided for reinforcement between the support frames 12b for the left and right wheels. Are installed in a ladder shape in a horizontal direction at regular intervals.
In addition, the support frame 12a for the loading platform, the support frame 12b for the wheels, the lateral frames 12c and 12d, the front handle 13 and the rear handle 14 all use iron pipes with a diameter of 30 mm, and the connection portions are firmly fixed by welding. And can be integrated.

As shown in FIG. 1, below the loading platform 11 in front of the wheels 20, 20, near both sides on the front side of the loading frame 12 a or the supporting frame 12 b for wheels or near the base of the front handle 13 a. A stand 15 fixed by welding is provided.
More specifically, the stand 15 shown in FIG. 1 is formed by bending a 27.2 mm diameter iron pipe so as to swell downward about 400 mm from the loading platform 11, and both ends thereof are supported for the front handle 13a and the wheel. It is fixed by welding to the frame 12b, and when the lower end portion 15a of the stand 15 comes in contact with the ground, the loading platform 11 is protruded to a height at which it is lowered slightly forward.

  The stand 15 has a lower end between a line D connecting the lower end 20a of the wheel 20 and the front handle 13 shown in FIG. 5 and a ground C parallel to the loading platform passing through the lower end 20a of the wheel 20 shown in FIG. Although the portion 15a is projected, the position of the lower end 15a of the stand 15 is such that when the front handle 13 is lowered and the lower end 15a is grounded, the loading platform 11 does not slide the load placed on the loading platform 11 Thus, the height of the loading platform 11 can be maintained in the inclined state.

The slope where the load placed on the loading platform 11 does not slide down is a little different in frictional resistance depending on the load placed such as tuna and Styrofoam box, but if the upper surface of the loading platform 11 is made of a material with high smoothness, The tilt angle is small, and when the surface is rough, the tilt angle is large.
For example, in the case of the hard PP resin plate, the angle is about 10 to 15 degrees.
When the loading platform 11 is lowered and the front end 15a of the stand 15 is grounded, the front handle 13a is bent upward by an angle of 20 degrees with respect to the loading frame 12a. The part handle 13a is raised at an angle of about 10 degrees from the bent part. For this reason, the front handle 13 is far away from the ground and is in a position that can be naturally held by the driver.

In addition, bearing portions 22 are provided symmetrically at substantially intermediate positions on the wheel support frames 12b and 12b.
The both bearings 22 are fitted with left and right wheels 20 and 20 at the front ends thereof, and bearing an axle 21 provided with a differential gear 23 at the middle.
The differential gear 23 is attached to the axle 21 because when the cart is rotated around the center of the axle 21, the two wheels 20 and 20 rotate in opposite directions around the center of the axle 21, respectively. This is to make it possible to easily perform a small turn and change of direction in the case.
The wheels 20 and 20 can be rubber tires having a diameter of 460 mm.

Next, a structure for controlling and operating the cart while electrically rotating the wheels 20 and 20 will be described. As shown in FIGS. 2 and 6, a rectangular frame is formed on the support frame 12b for the left and right wheels. Using a steel plate, a front base plate 16 a is installed on the front side of the axle 21, and a rear base plate 16 b is installed on the rear side of the axle 21.
Then, a motor 25 is continuously provided via a transmission 24 that transmits rotation to the axle 21, the motor 25 is arranged on the front base plate 16a side, and a charger or the like is mounted on the base plate 16a. A battery 26 for operating the motor 25 is mounted on the rear base plate 16b.
At that time, for example, the motor 25 mounted for rotating the wheel 20 is a motor having a capability of obtaining a speed of about 10 km / h even when a load of about 100 kg is placed on the loading platform 11. A sealed battery with a weight of about 20 to 30 kg that does not leak out and can be charged with a household power supply can be used.

At this time, the wheel drive members such as the battery 26, the motor 25, and the transmission 24 are arranged such that the center of gravity W of the entire cart is centered on the axle 21 and the vertical line Y on the center of the axle 21 as shown in FIG. The balance is arranged so that it is close and slightly biased to the front side. When the center of gravity W exceeds the vertical line Y, the center of gravity W moves to the direction beyond the center of gravity W so that the loading platform 11 is lowered in that direction. To.
When the front handle 13 is lowered by positioning the center of gravity W in this way, the center of gravity W of the entire cart moves over the vertical line Y on the center of the axle 21 to the front handle 13 side as shown in FIG. The stand 15 is lowered and hits the ground, and the loading platform 11 is supported by the stand 15.
Further, when the front handle 13 is raised, as shown in FIG. 2, the center of gravity W of the entire cart moves beyond the vertical line Y on the center of the axle 21 to the rear handle 14 side, the auxiliary wheel 40 is lowered and hits the ground. The loading platform 11 is supported by the auxiliary wheel 40.
In order to balance the entire cart, it is possible to adjust the position of the battery 26 back and forth freely so that it can be moved to the position of the center of gravity W of the entire cart including the battery 26 and fixed at the optimum position. is there.

The battery 26 is provided with a charger so as to be able to be charged to compensate for the reduced power, or the battery 26 with a charging function is used.
The motor 25 connected to the battery 26 by an electric wire 31 is rotated by the electric power of the battery 26, and the rotation is transmitted to the axle 21 via a mission 24 so that the left and right wheels 20, 20 It will rotate.
In other words, according to the present invention, it is possible to easily carry a load even with a heavy load by the force of the motor 25, and it is possible to carry even on an inclined land where it has not been possible to climb when the load is loaded.

Further, as shown in FIGS. 2 and 6, the motor 25 and the battery 26 are provided on the front handle 13 via an electric control unit 32 that controls the start, stop, and rotation speed of the wheel 20 by the motor 25. The operation unit 30 is electrically connected by an electric wire 31.
The electric control section 32 and the operation section 30 can be connected by a drive control electric wire 31 that passes through the metal pipe of the front side handle 13a so as not to obstruct the operation.

The operation unit 30 is provided with a power key insertion hole 33 for turning on / off the circuit of the motor 25 and the battery 26, and a forward / backward changeover switch 34 for changing the rotation direction of the wheel 20, and a forced rotation of the wheel. An emergency stop button 36 for decelerating and stopping is provided.
In addition, the right grip is provided with an accelerator grip 35 that adjusts the rotational speed of the motor 25 by grasping and rotating, and the traveling speed can be changed by adjusting the rotational speed of the motor 25 while holding the accelerator grip 35. To.
In addition, in FIG. 1, the aspect which provided the battery residual amount display part 37 of the liquid crystal screen connected with the accelerator grip 35 is shown.

It is also possible to provide a clutch for switching between free rotation of the wheel 20 and electric rotation by the motor 25 by electromagnetic operation, and a clutch switching switch 38 for performing the switching operation.
When the clutch for switching between the free rotation of the wheel 20 and the electric rotation by the motor 25 is a manually operated lever, even if the electric control system is disconnected or the battery 26 is disconnected, It becomes possible to continue the transportation work by switching to the manual traction mode.

Further, an emergency stop button 36 for emergency stop of the rotation of the wheel 20 can be provided.
In this case, when the emergency stop button 36 feels the danger of the collision of the cart, the fall of the load or the collapse of the cargo, the driver immediately presses the emergency stop button 36 with his / her hand to immediately stop the cart, Can be avoided.
It should be noted that a part of the switches provided in the operation unit 30 can be provided in a distributed manner on the front side handle 13a.

  The drive and operation by the motor 25 have been described above. Next, the auxiliary wheel 40 provided at the rear part of the cart will be described in detail.

  The auxiliary wheel 40 is provided with a folding mechanism 59 that can be moved into and out of the loading platform 11 and that can maintain the protruding state and the recessed state of the auxiliary wheel 20. First, the auxiliary wheel 40 itself will be described.

The auxiliary wheel 40 is provided at the rear part of the loading platform 11 and supports the loading platform 11 from below at a small inclination stage so that the rear side of the loading platform 11 is lowered and steeply inclined so that the loaded luggage does not slide down.
Even when the luggage is not loaded on the loading platform 11, the center of gravity W of the entire cart is perpendicular to the center of the axle 21 in order to maintain the state when the loading platform 11 is tilted slightly backward and downward. The weight balance is determined so that it is slightly behind the line Y.
At this time, if the center of gravity W is slightly in front of the vertical line Y on the center of the axle 21, the loading platform 11 does not descend toward the auxiliary wheel 40 and the front wheel lowers, so the auxiliary wheel 40 does not work. Will rise from the ground.

Further, in order to make sure that the protruding auxiliary wheel 40 is securely grounded and can support the rear part of the loading platform 11, the lower end portion 20a of the wheel 20 of the auxiliary wheel 40 is a supporting frame for the loading platform at the rear of the loading platform 11. 12a must protrude below a line B (shown in FIG. 3) connecting the lower end portion 14b of the bent portion of the rear handle 14 provided at the rear portion of 12a and the lower end portion 20a of the wheel 20.
However, there is a risk that the load may slide down if the loading platform 11 is steeply inclined even if it protrudes below the line B connecting the lower end portion 14b of the bent portion of the rear handle 14 and the lower end portion 20a of the wheel 20. There is.
Therefore, as shown in FIG. 2, a line A connecting the lower end portion 40 a of the auxiliary wheel 40 and the lower end portion 20 a of the wheel 20 is such that the upper surface of the loading platform 11 is nearly horizontal with the ground, and the center of gravity W is the axle 21. It is determined to be behind the vertical line Y on the center.
By positioning the center of gravity W, the auxiliary wheel 40 can be maintained in a grounded state even when no load is loaded on the rear side.
As described above, when the top surface of the loading platform 11 is in a state of being almost horizontal with the ground, for example, about 10 degrees to 15 degrees, natural slipping or collapse of the load does not occur even when the driver leaves the cart.

The auxiliary wheel 40 is a driven swivel caster wheel. When trying to turn the cart with the caster wheel, the caster wheel automatically turns in the turning direction, so even if a heavy load is loaded, the load can be supported by the auxiliary wheel and the carrier can be turned easily without resistance. It becomes possible.
FIG. 6 shows an embodiment in which one auxiliary wheel 40 is provided at the center of the rear portion, but two caster wheels arranged side by side symmetrically can also be used.

Next, the folding mechanism 59 configured to fold the auxiliary wheel 40 under the loading platform 11 will be described in detail.
2 and 6, the folding mechanism 59 causes the auxiliary wheel 40 to protrude from the center of the lateral frame 12c near the rear of the support frame 12a for the loading platform from the state in which the auxiliary wheel 40 protrudes downward. As shown in Fig. 2, it is possible to fold it sideways into an immersive state under the loading platform.
FIG. 8 is an enlarged side view of the main part around the auxiliary wheel 40, in which (a) shows the state where the auxiliary wheel 40 protrudes downward, and (c) shows the auxiliary wheel 40 folded. A state of being immersed under the loading platform is shown, and (b) shows a state in the middle of folding the auxiliary wheel 40.
FIG. 7 is a view of the main part of FIG. 8 as seen from the back of the cart.

In the following, description will be given in the form shown in FIGS.
The auxiliary wheel 40 is provided with a support base 43 at the lower end of a support rod 44 for projecting a bifurcated bearing part 42 supporting the axle 41 from the bottom of the cargo bed, and the bearing part 42 is connected to the support base 43 so as to be freely rotatable. Is done.
The bearing portion 42 is mounted by shifting the axle 41 from the center of rotation (center of the support rod).
That is, when a load is applied to the auxiliary wheel 40 by conveying a cart, the bearing portion 42 is a driven swivel type caster wheel that automatically rotates backward with respect to the movement of the auxiliary wheel 40 in the traveling direction. .
Reference numeral 58 in the figure denotes a rotation stop pedal for applying a brake. Stepping on the back side of the pedal 58 stops rotation, and stepping on the front side releases the rotation stop and makes the rotation free. This rotation stopping pedal is not required during operation, You can avoid running out of control by putting the brake on the slope and putting the brake on when the driver leaves the place.

  The upper end portion of the support rod 44 is pivotally supported under the loading platform so as to be pivotable in the front-rear direction. Next, the structure around the upper end will be described.

As shown in FIG. 6, the horizontal frames 12c and 12c are arranged symmetrically so as to bridge the center portions of the horizontal frames 12c in the parallel horizontal frames 12c and 12c provided at a distance from the rear of the support frame 12a below the loading platform. Two support plates 45 having a semicircular lower side are arranged in parallel with a distance therebetween, and an attachment surface 47 for the lateral frame 12c is provided on the front and back of the support plate 45, and the attachment surface 47 is screwed. At 48, it is fixed to the horizontal frame 12c.
Then, the pivot shaft 46 is installed in the lateral direction at the center of the semicircular circle on both plate surfaces of the support plate 45.
Further, a folding plate 50 sandwiched between the left and right support plates 45 and pivotally supported by the pivot shaft 46 is disposed so as to be swingable between the downward direction and the forward direction. The support rod 44 is protruded so as to be foldable around the pivot shaft 46 and fixed by welding.
8A, 8B, and 8C are diagrams that show the internal structure so that the front side of the support plate 45 is omitted.

Further, as shown in FIG. 8 (a), the folding plate 50 penetrates the pivot shaft 46 of the support plate 45 so that the pivot shaft 46 can slide up and down (in the vertical direction). A long slide long hole 55 is provided in the direction of the support rod 44.
Further, as shown in FIGS. 8 (A), (B) and (C), the folding plate is provided between the plate surfaces of the lower semicircular support plate 45 with the pivot shaft 46 as the center. A pin-shaped stopper 52 is provided that stops when a part of the rear outer edge 50a abuts when rotating so that 50 is directed downward.

  Further, when the outer edge 50a on the rear side of the folding plate 50 hits the stopper 52 on the outer periphery of the semicircular portion of the lower semicircular support plate 45, a locking pin 49 provided on the folding plate 50 is provided. Is provided with a locking groove 53 to be dropped toward the pivot shaft 46, and both ends 51 b and 51 a of the pull spring 51 are fixed to the pivot shaft 46 and the locking pin 49, respectively. The locking pin 49 is urged so as to be attracted.

Further, the locking pin 49 is separated from the locking groove 53 against the pulling spring 51 and out of the groove, and the locking pin 49 is moved around the outer periphery of the semicircular support plate 45 along the circumference. When slipped, the auxiliary wheel 40 is folded upward to reach a position where it is immersed. At that position, a locking groove 54 is provided on the outer peripheral edge of the support plate 45 so that the locking pin 49 is dropped by the biasing spring 51 toward the pivot shaft 46.
At this time, the pivot pin 46 of the support plate 45 moves in and out of the slide long hole 55 of the folding plate 50 in the direction of the support rod 44 so that the lock pin 49 supports the lock grooves 53 and 54. It moves in the direction of the rod 44 and can be engaged and disengaged.

Further, as shown in FIGS. 7 and 8, the support rod 44 is fixed with a manual lever 56 which stands upright on the support rod 44, protrudes backward, and is bent laterally from the middle.
A grip 57 for gripping with a hand is put on the tip of the manual lever 56.
The manual lever 56 moves the pivot shaft 46 in the direction of the support rod 44 against the pulling spring 51 along the slide long hole 55 of the folding plate 50, and the locking pin 49 is moved into two directions. The auxiliary wheels 40 are folded by the locking grooves 53 and 54.

Next, a description will be given of a method for causing the auxiliary wheel 40 to appear and disappear below the rear part of the loading platform by the folding mechanism 59.
When the auxiliary wheel 40 is changed from the protruding state shown in FIG. 8 (a) to the immersive state shown in FIG. 8 (c), first, when the auxiliary wheel 40 is in the protruding state shown in FIG. When the grip 57 of the manual lever 56 connected to the folding plate 50 is gripped by hand and a downward force is applied against the pulling spring 51, the locking pin 49 of the folding plate 50 moves from the locking groove 53 of the support plate 45. Exit.
Then, when the manual lever 56 is pushed forward as it is, the locking pin 49 comes into contact with the edge of the semicircular support plate 45 while being pulled by the pulling spring 51 and slides on the circumference thereof, as shown in FIG. The support rod 44 that supports the auxiliary wheel 40 is rotated forward about the pivot shaft 46 shown in FIG. 3), and the support rod 44 is further rotated upward to reach the locking groove 54.
When the hand pressing force is removed at this time, the locking pin 49 of the folding plate 50 is attracted to the locking groove 54 by the force of the pulling spring 51, and the locking pin 49 fits into the locking groove 54 and does not move. 40 can be maintained in an immersive state under the loading platform.

Contrary to the above, when the auxiliary wheel 40 is changed from the immersive state shown in FIG. 8C to the protruding state shown in FIG. 8A, the manual operation is performed when the auxiliary wheel 40 is in the immersive state shown in FIG. When the grip 57 of the lever 56 is gripped by hand and a force is applied forward against the pulling spring 51, the locking pin 49 of the folding plate 50 comes out of the locking groove 54.
When the manual lever 56 is pulled down as it is, the locking pin 49 slides on the circumference of the semicircular support plate 45, and the auxiliary wheel 40 is moved around the pivot shaft 46 shown in FIG. The support rod 44 to be supported is rotated downward, and the support rod 44 is further rotated rearward so that the locking pin 49 reaches the locking groove 53.
At this time, when the pushing force of the hand is released, the locking pin 49 of the folding plate 50 is drawn to the locking groove 53 by the force of the pulling spring 51, and the locking pin 49 fits into the locking groove 53 and stops moving. 40 can be maintained in a protruding state under the loading platform.
Since the locking pin 49 fits into the locking grooves 53 and 54 by the force of the pulling spring 51 and the auxiliary wheel 40 is kept in the protruding and protruding state, it does not occur that the locking and unloading occurs without permission.

  The folding mechanism 59 described above includes the auxiliary wheel 40 from the lower side, the rear side of the wheel driving member such as the battery 26, the motor 25 and the transmission 24 in front of the auxiliary wheel 40, the lower surface of the rear portion of the loading platform, and the ground when the rear portion of the loading platform is grounded. In the folded state, the rear part of the loading platform can be grounded, and in the opened state, the auxiliary wheel 40 is directed to the bottom of the loading platform. By projecting greatly, when the auxiliary wheel 40 comes in contact with the ground, the upper surface of the loading platform 11 can be supported so as to be almost horizontal.

  In the above, a specific example of the auxiliary wheel 40 that can be folded and unfolded from the bottom of the loading platform 11 by folding is shown. The folding mechanism 59 includes a grounding portion at the rear bottom of the loading platform and a lower end portion of the wheel 20 shown in FIG. From the upper side of the line B connecting 20a to the line A connecting the lower end portion 40a of the auxiliary wheel 40 and the lower end portion 20a of the wheel 20 when the loading platform 11 shown in FIG. The lower end portion 40a of the auxiliary wheel 40 can be moved in and out, and the protruding state and the immersed state can be maintained, and the folding mechanism 59 having such a function can have various other forms.

  The present invention is an electric two-wheeled cart that a person walks and drives. However, it is also possible to use a flat cargo bed with a luggage enclosure fence around it and use it as a rear car.

DESCRIPTION OF SYMBOLS 11 Load platform 11a Front load slip prevention body 11b Side load slip prevention body 12 Support frame 12a Load support frame 12b Support frame 12c for wheels Horizontal frame 12d Horizontal frame 13 Front handle 13a Front handle 14 Rear handle 14a Rear side handle 14b Lower end 15 of bent part of rear side handle 15a Stand 15a Lower end 16a of stand Front plate 16b Rear base plate 17 Grip 20 Wheel 20a Lower end 21 of wheel 21 Axle 22 Bearing 23 Differential gear 24 mission 25 motor 26 battery 30 operation part 31 electric wire 32 electric control part 33 power key insertion hole 34 advance / retreat switch button 35 accelerator grip 36 emergency stop button 37 battery remaining amount display part 38 clutch switch 40 auxiliary wheel 40a auxiliary wheel Lower end 41 Axle 2 Bearing portion 43 Support base 44 Support rod 45 Support plate 46 Pivot shaft 47 Mounting surface 48 Screw 49 Locking pin 50 Folding plate 50a Outer edge 51 of the folding plate 51 Spring 51a, 51b Both ends 52 of the spring spring Stopper 53 Engagement Stop groove 54 Lock groove 55 Slide long hole 56 Manual lever 57 Grip 58 Rotation stop pedal 59 Folding mechanism W Cargo center of gravity Y Vertical axis A on the center of the axle Auxiliary wheel when the loading platform is inclined so that the load does not slide down Line B connecting the lower end of the wheel and the lower end of the wheel Line C connecting the ground contact part at the lower rear of the platform and the lower end of the wheel D parallel to the platform passing through the lower end of the wheel D Lower end of the stand and the lower end of the wheel Line connecting

Claims (6)

In a two-wheel cart driven by a front handle provided in front of the cargo platform, the cargo platform at a position higher than the wheels rotates around the axles of the left and right wheels,
In a lower space of the loading platform, a wheel driving motor and a mission that are rotatably mounted on the axle and a battery that supplies electricity to the motor are provided.
The front handle is connected to the motor and the battery, and an operation unit for electrically operating the rotation start, stop, and rotation speed of the wheel is provided.
On the front side of the loading platform, a stand having a height that can hold the loading platform at an inclination that prevents the loaded luggage from sliding down when grounded is provided.
Provided at the rear part of the loading platform is an auxiliary wheel having a height capable of holding the loading platform at an inclination that prevents the loaded load from sliding down when grounded, and the auxiliary wheel is provided behind the wheel driving member when the rear of the loading platform is grounded. An electric two-wheel cart provided with a folding mechanism that can be folded in a space defined by a side, a lower surface of a rear portion of the loading platform, and the ground.   The folding mechanism pivotally supports a support rod that supports the auxiliary wheel on a pivotal support portion provided at the lower part of the loading platform so as to be able to reciprocate from the bottom to the front, and maintain and stop the suspension below the support rod. The electric two-wheel cart according to claim 1, further comprising a locking portion capable of maintaining the stop at the vehicle.   The electric two-wheel cart according to claim 2, wherein a manual lever for operating the auxiliary wheel to move in and out is provided on the support rod.   The electric two-wheel cart according to any one of claims 1 to 3, wherein the auxiliary wheel is a follower-swivel caster wheel that automatically rotates backward with respect to the traveling direction.   The electric two-wheel cart according to any one of claims 1 to 4, wherein a differential gear is provided on the axle. The electric motor according to any one of claims 1 to 5, wherein a clutch lever for switching between free rotation of a wheel and electric rotation by a motor is provided on an axle, and a clutch lever for switching the clutch is provided. Two-wheeled cart.

Images