JPS632794A - Electric handcart - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

[Technical Field] The present invention relates to an electric handcart such as a handcart for transporting luggage during shopping or the like in a general household. [Background technology 1] Various hand carts have been proposed in which a motor is attached and the power of the motor is used to transport heavy loads, but it is difficult to control the moving speed of these carts. Unless the hand cart was controlled to match the walking speed of the person operating it, the hand cart would move either too fast or too slow, making it extremely difficult to use.

OBJECT OF THE INVENTION 1 The present invention has been made in view of the above points, and an object of the present invention is to provide an electric handheld device with a simple structure that can be moved to follow the walking speed of a person. There are push carts available. [Disclosure of the Invention] The electric handcart of the present invention includes a handle, a main body, a driving wheel,
This electric handcart equipped with a motor for rotating the drive wheels is characterized in that the handle is rotatable and the rotation angle or position of the handle is detected to control the rotation of the motor. By configuring as described above, the drawbacks of the conventional example are solved. In other words, by configuring the device as described above, the rotation of the motor can be controlled by operating the handle, and the device can be moved to follow the walking speed of the person. The present invention will be described in detail below with reference to Examples. 1 to 6 show a first embodiment of the present invention, and a motor 7 and a speed reducer Wi8 are installed inside a main body 1, which will be explained first from this embodiment. The pair of drive wheels 4 are fixed to both ends of the drive wheel 1 supported by bearings 12, and are rotated by receiving the output of a motor 7 via a pair of pulleys 9 and a bell 10. Furthermore, driving wheel 1]
It is preferable to incorporate a one-way clutch or the like between the drive wheel 4 and the motor 7 so that it rotates freely when the motor 7 is not turned on. Rotate to . The outlet 15 is used to insert a plug when charging the battery 13 using a charger (not shown). Seven frames 2 are fixed on the main body 1, and a bag 6 is attached to the front of the frame 2 on the main body 1. The handle 3 is attached to the frame 2 via a pair of lower connecting members 16 and upper connecting members 17. The lower connecting member 16 and the upper connecting member 17 are connected to be rotatable relative to each other within a predetermined range. - Pair of r connecting members 16
A reinforcing member 18 is installed between them. The connecting member 16 has one shaft g protruding from it, and the bearing 28 of the upper connecting member 17 is mounted on the outer periphery of the shaft g. ! It is fitted in and rotates around this point. The lower connecting member 16 is integrally provided with a protrusion 23 and a stopper 24, and the upper connecting member 17 has a corresponding notch! 54 is provided. The projection 23 and the stopper 24 come into contact with this notch 54 to regulate the rotation angle of the upper connecting member 17. Further, a spring 20 is attached to the shaft portion 19, and its negative end is in contact with the projection 23 and the spring end is in contact with the upper connecting member 17 via the adjusting screw 22, and the upper connecting member 17 is moved in the direction of arrow A in Figure 4. is energized. The spring force of this spring 20 can be set to a predetermined value by an adjustment screw 22. In other words, handle 3
The rotational return force can be varied. An arm 25 projects from the bearing 28 of the upper connecting member 17, and a magnet 26 is attached to this arm 25. This magnet 26
A control switch 27 is attached to the lower connecting member 16 opposite to the lower connecting member 16. The control switch 27 is a magnetic proximity switch, and when the handle 3 is tilted in the direction of arrow B in FIG. do. The main switch 21 is the control switch 2 as shown in PIS6 diagram.
7 are connected in series, and normally by turning off the main switch 21, the power supply to the motor 7 can be cut off regardless of the state of the control switch 27, and the motor 7 will not rotate inadvertently. This is something that can be prevented from happening. When carrying a heavy load or going up a slope, turn on the main switch 21, hold the handle 3, and pull it in the direction of arrow B in Figure 1.The handle 3 rotates and the control switch 27 is turned on, turning the motor 7 on. rotates, and the entire handcart is moved in the direction in which the handle 3 is tilted down [see Figure 18 (b)]. At this time, if the moving speed is set slightly faster than the human's walking speed, when the handcart moves faster than the human's walking speed and tries to get in front of the human, the handle 3 will be in an upright position. When it returns, the control switch 27 is turned off and the motor 7
[Refer to Figure 18 (a) 1] If the person continues to walk while holding the handle 3, the handle 3 will fall again in direction B, and the control switch 27 will be turned on, causing the motor 7 to stop.
rotates. By repeating the above steps, the handcart can be moved at a speed that matches the walking speed of a human. , and a one-way clutch is built in between the driving wheels 1 and 4, so that they can move freely in the direction of arrow C in FIG. 1 even when the motor 7 is stopped. FIGS. 7 to 10 show a second embodiment of the present invention, and this embodiment will be described next. The handle 3 is rotatable in both directions of arrows B and D in FIG. This embodiment differs from the f51 embodiment in that the structure of the lower connecting member 16 and the upper connecting member 17 and that a one-way clutch is not built in between the driving wheels 4 and 1], but the rest is generally the same. Lower connecting member 16 and upper connecting member 17
are respectively attached to a shaft portion 19 provided on the body by a bearing 28 so as to be relatively rotatable. This rotation range is controlled by moving the protrusion 23 provided on the lower connecting member 16 to the stopper 24.
and is regulated by a notch 54 provided in the upper connecting member 17. Further, a spring 29 is wound around the shaft portion 19.
Both end portions abut the projections 23 and the stopper 24, respectively, and the middle portion engages with a pin 30 provided on the upper connecting member 17, thereby always holding the upper connecting member 17 and the handle 3 in an upright position. It's been like a few minutes. Also bearing 2
8 has two arms 3]. 32 are provided so as to be 180'' rotationally symmetrical, and conductive metal fittings 33 and 34 are attached to the arms 3 and 32, respectively. A pair of contact metal fittings 35.38 are attached, and contact metal fittings 35.3
Contacts 36, 37, 39, 40 are provided at each end of 8 so as to face the conductive metal fittings 33, 34 with a predetermined gap therebetween. When the main switch 21 is turned on and the handle 3 is pulled in the direction of arrow B in FIG. 1, the bearing 28 rotates in the direction of arrow E in FIG.
3.34 come into contact with contacts 36.40, respectively, causing the motor 7 to rotate in the normal direction as is clear from the circuit diagram in FIG.
Move in the direction of arrow C in Figure S1. Also, when the handle 3 is pulled in the direction of the arrow in Figure 1, the bearing 2
8 rotates in the direction of arrow C in FIG. 1, the conductive metal fittings 33 and 34 come into contact with the contacts 37 and 39, respectively, and the polarity of the voltage applied to the motor 7 is reversed, as is clear from the circuit diagram in FIG. The motor 7 is reversed to move the handcart in the direction of arrow C in FIG. In this case, as in the first embodiment, by setting the moving speed of the handcart to be slightly faster than the walking speed of the person, speed control that follows the walking speed of the person can be performed. Figures 1 to 13 show the third embodiment of the present invention,
Describe this example to a dog. The lower connecting member 16 and the upper connecting member 17 are rotatably attached by a shaft portion 41 and a bearing 42 as in the first and second embodiments. Further, a variable resistor 43 is attached to the upper connecting member 17,
A pongee 44 for adjusting the resistance value is fitted onto the shaft portion 41 with a rotation prevention mechanism. When the handle 3 is pulled in the direction of arrow C in FIG. 1, the upper connecting member 17 rotates to change the resistance value of the variable resistor 43. Rotation angle of handle 3 and variable resistor 4
The relationship between the resistance value of No. 3 and the rotational speed of the motor 7 is as shown in FIG. When the rotation angle of the handle 3 is small, the resistance value is high, so the rotation speed of the motor 7 is low, and as the rotation angle becomes larger, the resistance value becomes smaller and the rotation speed of the motor becomes faster. Therefore, if the moving speed of the handcart is too fast compared to the walking speed of the person, the distance between the person and the handcart becomes close and the handle 3 stands up (this increases the resistance value and slows down the rotation speed of the motor 7. On the other hand, if the handcart is too slow, the handle 3 will be pulled and tilted more, so the resistance value will be lower and the rotation speed of the motor 7 will become faster. When the moving speeds of 2 and 3 match, the rotation angle of the handle 3 is stabilized, and the moving speed of the handcart is also stabilized.Here, the rotation angle of the handle 3 is detected using a rotary encoder instead of a variable resistor. The number of rotations and the direction of rotation of the motor 7 may be controlled. Figures 14 and 15 show a fourth embodiment, and this embodiment will be described next. A handle 45 is rotatably attached thereto.A control switch 49 is attached inside the stand 46, and a handle 47 of the handle 45 is attached.
Arms 48 provided at the front are arranged at predetermined intervals. Now, when the handle 45 is rotated in the H direction in Fig. 14,
When the arm 48 comes into contact with the control switch 491, the switch 4
9 closes, motor 7 rotates, and the handcart moves in the direction of arrow C in Fig. 14.
direction [see Figure 19 (b)]. At this time, if the moving speed of the handcart is set to be slightly faster than the speed of the person as in the first and second embodiments, the distance between the person and the handcart will become closer and the handle 45 will gradually move as shown in the PIS 14 diagram. After rotating in one direction, the switch 49 is finally turned off and the motor 7 stops (see Fig. 19 (a)). When the person continues walking, the distance between the person and the handcart increases again, and the handle 45
rotates in the direction of arrow H, the four switches close, and motor 7
rotates. By repeating turning on and off of the switch 49 in this manner, the handcart can be moved in accordance with the walking speed of the person. FIGS. 16 and 17 show a fifth embodiment, and this embodiment will be described next. In the ninth embodiment, a tilt sensor 50 is attached to the main body 1. The tilt sensor 50 includes a magnetic fluid 52 contained in a case 51.
and a control switch 53. The magnetic fluid 52 is a colloidal solution in which fine magnetic particles such as magnetite are dispersed in a solvent such as water using a surfactant. Control switch 53 is a magnetic proximity switch. The configuration of the pond is approximately the same as that of the fourth embodiment except for the four control switches in the base 49 for installation. When moving, hold the handle 45 and pull it in the direction of arrow C at the 14th point, and the entire handcart including the main body 1 will rotate around the drive wheel 4. At this time, the inclination sensor 50 is tilted as shown in FIG. 17 (B), the magnetic fluid 52 approaches the control switch 53, the control switch 53 is closed, the motor 7 rotates, and the handcart is moved as shown by the arrow C in FIG. 1f519 (see figure (b))]. Here, if the moving speed of the handcart is set faster than the walking speed of the person as in the first, second and fourth embodiments, the upper part of the handcart will be supported by the human hand 1, and the handle 45 will be supported by the person's hand 1. In order to move at the speed of a human walking, the entire handcart changes its posture in the direction of standing up.When the angle exceeds a predetermined angle, the control switch 53 is turned off and the drive wheels 4 stop [see Figure 19 (a)] ], when the person continues to walk, the top of the handcart is pulled again, the entire handcart tilts, the control switch 53 is closed, and the drive wheels 4 begin to rotate again.By repeating the above operation, the speed at which the person walks is adjusted. The handcart can be moved by following the handle. [Effects of the Invention] As described above, the present invention makes the handle freely rotatable, and detects the rotation angle or position of the handle to control the rotation of the motor. The rotation of the motor can be controlled by a handle that moves according to the walking condition of the person, and the speed at which the handcart moves can be controlled to follow the walking speed of the person with a simple structure. It is easy to use.

[Brief explanation of drawings]

Fig. ff51 is a perspective view showing the entire first embodiment of the present invention, Fig. fiS2 is a bottom view of Fig. f51, and Fig. 3 is a perspective view of the first embodiment of the present invention.
1l-1 line sectional view, F! S4 Figure + [s 3 Figure y>N
-N line sectional view, Figure 5 is the ■-V line sectional view of Figure 3, Figure 6 is the circuit diagram of the tjSl embodiment, Figure 7 is the same MS as above.
A cross-sectional view of the main part of the second embodiment, Figure 8 is PIS7 diagram ■-
9 is a sectional view taken along line IX-IX in FIG. 7, FIG. 10 is a circuit diagram of the second embodiment, and FIG. , Figure 12 is a circuit diagram of the third embodiment, Figure f513 is an explanatory diagram of the operating state of the $3 embodiment, tj
Figure SL4 is a perspective view showing the entire fourth embodiment, f515
The figure is an x-xim view, FIG. 16 is a bottom view of the embodiment of m5, and FIG. Cross-sectional view, No. 18
Figures (a) and (b) are from 1st to 2nd? 19(a) and 19(b) are explanatory diagrams of the operating state of the embodiment of IS3, and FIGS. The drive wheel 7 is a motor. Agent Patent Attorney Stone 1) 艮 7 fig. 1 fig. 2 fig. 5 fig. 6 97 fig. 1] Fig.! Figure 13 Figure 12 Figure 12 0 Hashito °゛ No 1 C mouth force ρ1 ' Figure 17 (A) (B)

Claims (1)

[Claims] [1] An electric handcart including a handle, a main body, a drive wheel, and a motor for rotating the drive wheel, wherein the handle is rotatable and the rotation angle or position of the handle is adjustable. An electric handcart characterized by detecting and controlling the rotation of a motor. [2] The electric handcart according to claim 1, characterized in that the rotation return force of the handle is variable. [3] The electric handcart according to claim 1, wherein the motor is configured to rotate forward or reverse depending on the direction of rotation of the handle. [4] The electric handcart according to claim 1, wherein the rotation speed of the motor is made variable in accordance with the rotation angle of the handle. [5] Claim 1, characterized in that the motor is rotated in a rotational direction such that when the handle is rotated in the pulling direction, the main body moves in the pulling direction.
Electric handcart as described in section. [6] The electric handcart according to claim 1, wherein rotation of the handle is detected by an inclination sensor.