JPH10119783A - Motor dolly - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor dolly easy to drive and safe with a low possibility of misoperation. SOLUTION: A motor dolly is provided with a travel control circuit for switching the rotating direction of a traveling motor on the basis of the operating state of a driving operating part 12 provided at the upper part of a steering turning shaft 8. The driving operating part 12 is provided with a steering operating member 13 fixed to the upper part of the turning shaft 8 and extended to the left side, a switching operating member 14 fitted in a longitudinally rotatable state to the left end part of the steering operating member 13 and extended to the right side, holding members 15, 16 and a spring 17 for holding the switching operating member 14 into a neutral position in relation to the steering operating member 13. The travel control circuit is provided with limit switches 24, 25 for detecting forward operation of the switching operating member 14 being rotated to the front side in relation to the steering operating member 13, and reverse operation of the switching operating member 14 being rotated to the rear side. When forward operation is detected, the motor is rotated in a forward direction, and when reverse operation is detected, the motor is rotated in a reverse direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a walking driving type electric transport vehicle in which driving wheels for driving are driven by a DC motor, and the traveling direction is switched between forward and reverse.

[0002]

2. Description of the Related Art Conventionally, as an electric carrier of this type, a handlebar for a driver to perform operations such as steering by hand is provided with a forward / backward changeover switch, a traveling start switch, a brake switch, and the like. Things are known.

[0003] In such a transport vehicle, by turning on the traveling start switch in a state where the changeover switch is switched to the forward side, the electric motor rotates in the forward direction, and the transport vehicle moves forward. Conversely, by turning on the traveling start switch in a state where the changeover switch is switched to the reverse side, the electric motor rotates in the reverse direction, and the carrier moves backward.
In addition, by switching the changeover switch in a state where the traveling start switch is turned on and the carrier is moving forward or backward, the rotation direction of the electric motor is switched, and the traveling direction of the carrier is switched.

[0004] In the case of the above-mentioned conventional electric carrier, there is a problem that the switch must be operated while the steering is carried out by holding the handlebar with a hand, which makes driving difficult.
In addition, there is a possibility that the switch may be operated by mistake, and the erroneous operation may cause the carrier to perform an unexpected operation of the driver, which is dangerous.

[0005] It is an object of the present invention to provide a safe electric transport vehicle that is easy to drive and has little risk of erroneous operation.

[0006]

SUMMARY OF THE INVENTION An electric carrier according to the present invention is an electric carrier whose traveling direction can be switched between forward and reverse. A steering swivel mounted on the vehicle body so as to be able to turn around an axis, a driving operation unit provided at an upper part of the steering swivel for the driver to hold and operate, and the driving A driving control unit that switches a rotation direction of the electric motor based on an operation state of the operation unit, wherein the driving operation unit extends rightward or leftward with one end in a left-right direction fixed to an upper part of the turning shaft. A steering operating member, a switching operating member attached to an end of the steering operating member remote from the pivot axis so as to be rotatable around a vertical axis, and extending to the pivot axis side; switching Neutral position holding means for holding the operating member at a predetermined neutral position with respect to the steering operating member, wherein the traveling control means rotates the switching operating member forward with respect to the steering operating member. An operation detecting means for detecting a forward operation performed and a reverse operation in which the switching operation member is rotated rearward with respect to the steering operation member, and the forward operation is detected by the operation detecting means. Sometimes, the motor is rotated in the forward direction, and when the reverse operation is detected by the detection means, the motor is rotated in the reverse direction.

In this specification, front, rear, left and right refer to the traveling direction of an electric carrier. In the following description, the mounting end of the steering operation member to the steering turning shaft is referred to as the base end of the steering operation member, and the opposite end is referred to as the free end of the steering operation member. The attachment end of the operating member to the steering operating member free end is referred to as the base end of the switching operating member, and the opposite end is referred to as the free end of the switching operating member.

[0008] Generally, the electric carrier has a state in which the switching operation member of the driving operation unit is held by both hands, that is, a part near the base end of the switching operation member by one hand and the other hand. It is operated with the part near the free end. When the forward operation is performed by pushing the free end side of the switching operation member forward with the other hand, the switching operation member rotates forward with respect to the steering operation member, which is detected by the operation detection means, and travels. The electric motor is rotated in the forward direction by the direction control means, and the carrier moves forward. Conversely, when the reverse operation of pulling the free end of the switching operation member backward with the other hand is performed, the switching operation member rotates rearward with respect to the steering operation member, and this is detected by the operation detection means. Then, the electric motor is rotated in the reverse direction by the traveling direction control means, and the carrier moves backward. When the carrier is moving forward and the switching operation member is pushed forward with the other hand, and the base end side of the switching operation member is pushed forward or pulled back with one hand, The steering operation member pivots forward and backward, and the steering pivot shaft pivots to perform steering. In addition, in a state where the carrier is moving backward, the switching operation member is pulled rearward with the other hand, and the base end side of the switching operation member is pushed forward or pulled back with one hand. Then
The steering operation member rotates back and forth, and the steering turning shaft turns to perform steering. Since one hand has a portion near the base end of the switching operation member, the force for pushing and pulling this hand back and forth acts on a portion near the free end of the steering operation member. Therefore, a large moment about the turning axis acts on the steering operation member, and steering is easily performed.
Further, since the force for pushing and pulling one hand acts on a portion near the base end of the switching operation member, a large moment for rotating the switching operation member with respect to the steering operation member does not act on the switching operation member. . Therefore, even if one hand is pushed or pulled, the position of the switching operation member with respect to the steering operation member does not change, and the steering operation can be performed while the switching operation member is held in the forward operation state or the reverse operation state. it can.

As described above, according to the electric transport vehicle of the present invention, the electric transport vehicle can be run only by pushing and pulling the operation unit. Therefore, there is no need for a conventional switch operation, and driving is easy. In addition, when the operation unit is pushed forward, the vehicle moves forward, and when the operation unit is pulled backward, the vehicle moves backward. Since the operation direction of the operation unit matches the traveling direction of the electric transport vehicle, there is little possibility of erroneous operation and the vehicle is safe.

[0010] Further, it is only necessary to provide an operation section on the steering turning shaft of the transport vehicle, and the vehicle body can be shared with a hand-held transport vehicle without assistance by an electric motor.

Further, in the operation section, the switching operation member is attached to a free end of the steering operation member fixed to the steering rotation shaft and extending to one side in the left-right direction, and extends to the steering rotation shaft side. Therefore, the left and right width of the operation unit can be made small and compact, and the left and right width of the operation unit can be made smaller than the vehicle body width so that the operation unit does not protrude outward in the left and right direction from the vehicle body. .

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall schematic configuration of an example of a walking-drive type electric transport vehicle (1), and FIGS. 2 to 5 show details of a part thereof. FIG. 6 shows an example of the travel control circuit (2) constituting the travel control means.

As shown in FIG. 1, the electric transport vehicle (1) includes a vehicle body (4) provided with a load table (3) on an upper surface thereof.
At the front end and the rear end of the upper surface of (3), the fall prevention fences (5) and (6) are set up. A pair of left and right front wheels (driven wheels) (7) are attached to the front part of the vehicle body (4) so as to freely rotate. At the rear end of the vehicle body (4), a portion near the lower end of a substantially vertical steering turning shaft (8) is supported so as to be able to freely turn around its axis. A wheel housing (9) is fixed to the lower end of the turning shaft (8).
A rear wheel (steering and driving wheel) (10) is rotatably mounted on (9). The housing (9) is provided with a traveling DC motor (permanent magnet motor) (11) for driving the rear wheel (10). And the pivot (8)
By turning the wheel, the rear wheel (10) is steered, and by switching the rotation direction of the electric motor (11), the rotation direction of the rear wheel (10), that is, the traveling direction of the transport vehicle (1) is switched between forward and reverse. Can be

An operating section (12) for the driver to hold and operate by hand is provided at the upper end of the turning shaft (8), and details thereof are shown in FIGS.

The operation section (12) has a pivotal axis at the base end (right end).
(8) A steering operation member fixed to the upper end of the steering operation member and extending to the left.
(13) A pivot shaft which is attached to the free end (left end) of the steering operating member (13) so as to be rotatable about a vertical axis.
(8) A switching operation member (14) extending to the side (right side) and a neutral position holding means for holding the switching operation member (14) at a predetermined neutral position with respect to the steering operation member (13). A pair of front and rear holding members (15) and (16) and a compression coil spring (17)
It has.

The upper end of the turning shaft (8) is fitted and fixed in a hole of a substantially rectangular parallelepiped block (18). The steering operation member (13) has a rectangular frame shape that is open on both upper and lower surfaces and that has a larger left-right width than the height and the front-rear width. That is,
Steering operation member (13) includes left and right side walls (13a) (13b), front wall (13c)
And the rear wall (13d), which is inclined in the front-rear direction so that the rear side is slightly higher, and the outer surface of the right side wall (13b) is a block (18)
Is fixed to the left end face. The connecting cylinder (19) is fixed to the outer surface of the left side wall (13a) of the steering operation member (13) so as to be parallel to the left side wall (13a) and the front wall (13c).

The switching operation member (14) includes left and right long side walls (14c) and a side wall (14c) that connect front end portions of the side walls (14a) (14b), which are long in the front-rear direction. A long left and right rear wall (14d) connecting front and rear intermediate parts of 14a) and (14b), front and rear walls
(14c) (14d) and the top wall (14e) covering the upper surface of the space between the left and right side walls (14a) (14b), the bottom wall (14f) provided only on the left end of the lower surface of the space, and the side wall ( It consists of a pipe-shaped handlebar (20) extending right and left by connecting the rear end parts of 14c) and (14d). The switching operation member (14) is such that the upper part of the steering operation member (13) and the block (18) fits in the space between the front and rear walls (14c) and (14d), and the cylinder (19) has a bottom wall (14f). ) And the top wall (14e) so that the top wall (14e), the cylinder (19) and the bottom wall (1
It is attached to the steering operating member (13) by a pin (21) passed through 4f). Front and rear walls (14c) of switching operation member (14)
The front-rear spacing (inner width) of (14d) is larger than the front-rear width of the steering operating member (13), and the switching operating member (14) is centered on the pin (21) as shown in FIG. The wall (14d) is
3) The front end position, which is near the right end of the rear wall (13d),
As shown in FIG. 5 (b), the front wall (14c) can be rotated back and forth between a front end (13c) of the steering operating member (13) and a rear end position corresponding to a portion near the right end of the front wall (13c). I have.

Each of the holding members (15) and (16) is formed by forming a thin shaft portion (15a) (16a) on the front axis of a stepped short columnar portion. 16a) is the front and rear walls of the steering operation member (13)
(13c) Guide hole (22) formed near the right end of (13d)
(23) is inserted from the inside so as to be movable back and forth. A spring (17) is attached to a portion between the back surfaces of the front and rear holding members (15) and (16) in the steering operation member (13) in a state where it is slightly compressed from a natural state. In a state where no external force is acting on the steering operation member (13), the elastic force of the spring (17) causes
The front surfaces of the holding members (15) and (16) are the front and rear walls of the steering operation member (13).
The shaft portions (15a) (16a) are pressed against the inner surfaces of (13c) and (13d) and protrude outward from the front and rear walls (13c) (13d). And the shaft
(15a) The front and rear walls (14a) of the switching operation member (14)
c) is pressed against the inner surface of (14d), whereby the switching operation member (14) has its front and rear walls (14c) (14d) and the front and rear walls (13c) (13d) of the steering operation member (13) Held in a neutral position that is parallel to When the spring (17) pushes the right side portion of the switching operation member (14) forward with a force larger than the force for holding the switching operation member (14) at the neutral position (neutral position holding force), FIG. As shown in (5), the rear holding member (16) is pushed forward by the rear wall (14d) and moves forward, and the switching operation member (14) rotates to the front end position. Conversely, when the right side portion of the switching operation member (14) is pulled backward with a force greater than the neutral position holding force, the front holding member (15) is moved by the front wall (14c) as shown in FIG. 5 (b). The switch operation member (14) is pushed and moved backward, and the switching operation member (14) rotates to the rear end position.

Two limit switches (hereinafter abbreviated as "LS") (24) and (25) as operation detection means, ie, a switching operation member (13) are provided on the right side of the center in the steering operation member (13). A first LS (24) for forward movement that detects a forward movement operation in which the switching operation member (1) is rotated to the front end position, and a switching operation member (1).
4) is mounted with a second LS (25) for reverse movement which detects a reverse operation rotated to the rear end position. The first LS (2
The operation shaft (actuator) (24s) of (4) penetrates a hole (26) formed in the rear wall (13d) of the steering operation member (13) and protrudes outside. When the switching operation member (14) is in the neutral position, the tip (rear end) of the operating shaft (24s) is slightly away from the rear wall (14d) of the switching operation member (14), and LS (24) is Inactive. And the switching operation member (14)
Is rotated to the front end position, the operating shaft (24s) is pushed forward by the rear wall (14d) of the switching operation member (14), and
(24) is switched to the operating state. The operating shaft of the second LS (25) (25
s) protrudes outside through a hole (27) formed in the front wall (13c) of the steering operating member (13). When the switching operation member (14) is in the neutral position, the tip of the operating shaft (25s) is slightly behind the front wall (14c) of the switching operation member (14),
LS (25) is inactive. Then, while the switching operation member (14) rotates to the rear end position, the operating shaft (25
s) is pushed backward by the front wall (14c) of the switching operation member (14), and the LS (25) is switched to the operating state. LS (24) (2
5) constitutes a part of the travel control circuit (2), and the travel control circuit (2) is configured as follows (see FIG. 6). A between the + side of the DC power supply and the ground (G) side,
A series connection circuit of a contact (normally open contact) (24a) and a first magnet switch for forward movement (hereinafter abbreviated as “MS”) (28);
A series connection circuit of the a contact (25a) of the second LS (25) and the second MS (29) for reverse traveling, and a series connection of an a contact (28a) and a b contact (normally closed contact) (28b) of the first MS (28). Circuit, and 2M
A series connection circuit of a contact (29a) and b contact (29b) of S (29) is connected in parallel, and a contact (28a) and b contact of the first MS (28) are connected.
(28b), a contact (29a) of the second MS (29) and b
An electric motor (11) is connected to a portion between the contacts (29b).

In the above-mentioned transport vehicle (1), when the operating portion (12) is not held by hand, the switching operating member (14) is moved to the neutral position by the spring (17) and the holding members (15) and (16). And the two LSs (24) (25) are inactive and their a
The contacts (24a) (24b) are open. Therefore, the two MSs (28) and (29) are in a non-energized state, and their a
Since the contacts (28a) and (29a) are open, the motor (11)
No current flows through Therefore, the electric motor (11) stops rotating, and the transport vehicle (1) stops traveling.

The above-described transport vehicle (1) is driven while the driver walks while holding the left portion of the handlebar (20) with the left hand and the right portion of the handlebar (20) with the right hand. Bar (20)
When no force is applied, the switching operation member (14) is held at the neutral position, and the transport vehicle (1) stops traveling even when the user holds the switch. Then, mainly by pushing and pulling the right portion of the bar (20) with the right hand, the switching operation member (14) is rotated back and forth with respect to the steering operation member (13), so that the transport vehicle (1) And the traveling direction can be switched, mainly by pushing and pulling the left part of the bar (20) with the left hand, turning the switching operation member (14) and the steering operation member (13) back and forth. By doing so, steering can be performed by changing the direction of the rear wheel (10).

Since the right hand is far away from the pin (21) to the right and close to the pivot (8), when the right hand pushes and pulls the right part of the bar (20) forward and backward, the pin (21) is pulled out. Although the moment for rotating the switching operation member (14) back and forth relative to the steering operation member (13) is large, the steering operation member (13) and the switching operation member are centered on the pivot (8). The moment for rotating (14) back and forth is small. For this reason, the bar (20) with your right hand
When the right side portion of the is pushed forward, the steering operating member (13) hardly rotates, but the switching operating member (14) rotates to the front end position with respect to the steering operating member (13), and the first LS (24) is activated. Thereby, the a contact (24) of the first LS (24)
a) is closed, the first MS (28) is energized, its a contact (28a) is closed, and its b contact (28b) is open. At this time, the second LS (25) is inactive and its a-contact (25a) is open, so the second MS (2)
9) is a non-energized state, the a contact (29a) is open, and the b contact (29b) is closed. Therefore, the first MS (2
8) a contact (28a), motor (11) and second MS (29) b
Current flows through the contacts (29b), which causes the motor (1
1) rotates in the forward direction, the rear wheel (10) rotates in the forward direction, and the transport vehicle (1) moves forward. Conversely, when the right hand of the bar (20) is pulled backward by the right hand, the steering operating member (13) hardly rotates, but the switching operating member (14) is turned by the steering operating member (1).
It rotates to the rear end position with respect to 3), and the second LS (25) is activated. As a result, the a contact (25a) of the second LS (25) is closed, the second MS (29) is energized, the a contact (29a) is closed, and the b contact (29b) is open. State. At this time, since the first LS (24) is in a non-operation state and its a contact (24a) is in an open state, the first MS (28) is in a non-energized state and its a contact (28a) is in an open state. b contact (29b)
Is closed. Therefore, the a contact (29a) of the second MS (29), the b contact (28) of the electric motor (11) and the first MS (28).
Electric current flows through b), whereby the electric motor (11) rotates in the reverse direction, the rear wheel (10) rotates in the reverse direction, and the transport vehicle (1) moves backward.

Since the left hand is far away to the left from the pivot (8) and located near the pin (21), when the left hand pushes and pulls the left portion of the bar (20) forward and backward, the pivot (8) Although the moment for rotating the steering operation member (13) and the switching operation member (14) back and forth around is large, the switching operation member with respect to the steering operation member (13) around the pin (21) is large. The moment for rotating (14) back and forth is small. For this reason, the bar (20) with your right hand
Pushing and pulling the left part of the bar (20) forward and backward with your left hand while pushing the right part of the switch forward, the switching operating member (14) hardly rotates with respect to the steering operating member (13), The operating member (13) and the switching operating member (14) are integrally formed and rotate back and forth about the turning shaft (8). Thus, while holding the switching operation member (14) at the front end position and moving the transport vehicle forward, the turning shaft (8) is turned left and right, and the transport vehicle is steered. Then, by pulling the left part of the bar (20) forward and backward with the left hand while pulling the right part of the bar (20) backward with the right hand, similarly, the switching operation member (14)
Is held at the rear end position, and the carrier is steered while moving the carrier backward.

When the power of the hand holding the bar (20) is released or the hand is released from the bar (20), the switching operation member (14)
Returns to the neutral position, and as described above, the electric motor (11) stops rotating and the transport vehicle (1) stops traveling. Therefore,
Even if the driver accidentally releases his hand from the bar (20) while driving, the transport vehicle (1) stops running immediately and is safe.

In the electric carrier (1), the carrier (1) can be run while steering by simply holding and pushing and pulling the bar (20) of the operation section (12) with both hands. Therefore, there is no need for a conventional switch operation, and the operation is simple. In addition, when the bar (20) is pushed forward, it moves forward, and when it is pulled backward, it moves backward.
It is safe. In addition, it is only necessary to provide the operation unit (12) on the turning shaft (8) for steering of the transport vehicle (1), and the vehicle body can be shared with a hand-operated transport vehicle without assistance by an electric motor. further,
In the operation section (12), the switching operation member (14) is
Attached to the left end of the steering operation member (13) fixed to (8) and extending to the left, extending to the right and steering operation member (13)
The operation unit (12) is small and has a small left and right width, and the left and right width of the operation unit (12) is
It is also possible to make the width smaller than (4) so that the operation unit (12) does not protrude outward in the left-right direction from the vehicle body (4).

In the above embodiment, the portion of the steering turning shaft (8) provided with the operating section (12) is substantially vertical.
This portion may extend in the vertical direction, and may be oblique. Further, in the above embodiment, the switching operation member (14) is configured to rotate around the oblique axis extending in the up-down direction with respect to the steering operation member (13). May be substantially vertical.

In the above embodiment, the rear wheel (10) is connected to the electric motor (11).
The rear wheel (10) is always driven by the motor (11) so that the transport vehicle (1) runs.However, between the motor (11) and the rear wheel (10), It is also possible to provide a clutch device that is connected only when the electric motor (11) is rotating, so that the transport vehicle can be manually driven when the load is light and light. In this case, the neutral position holding force by the spring (17) is set to be larger than the force required for running the transport vehicle at light load. Then, even when the bar (20) is pushed and pulled back and forth at a light load, the switching operation member (14) remains held at the neutral position, and the carrier can be driven manually. When the load becomes heavy, the vehicle cannot travel with a force smaller than the neutral position holding force, and by pushing and pulling the right side of the bar (20) back and forth with a force larger than the neutral position holding force, As described above, the electric motor (11) rotates, and the carrier is driven.

In the above embodiment, the rear wheel (10) serves both as a driving wheel and a steering wheel, but the driving wheel and the steering wheel may be provided separately.

Further, the type of the electric transport vehicle is not limited to the above-described embodiment, and can be appropriately changed.

[Brief description of the drawings]

FIG. 1 is a left side view of an electric vehicle showing an embodiment of the present invention.

FIG. 2 is an enlarged view taken along the line II-II of FIG. 1 and partially cut away.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a sectional view taken along the line VI-VI of FIG. 3 and partially cut away.

FIG. 5 is a schematic plan view of an operation unit showing two different states during operation.

FIG. 6 is an electric circuit diagram showing an example of a traveling control circuit.

[Description of Signs] (1) Electric carrier (2) Travel control circuit (8) Steering turning shaft (11) DC motor for traveling (12) Operation operation part (13) Steering operation member (14) Switching operation Member (15) (16) Holding member (17) Spring (24) (25) Limit switch

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI G05G 9/02 G05G 9/02

Claims (1)

[Claims] 1. An electric transport vehicle in which a traveling direction can be switched between a forward direction and a reverse direction, wherein an electric motor for traveling is mounted on a vehicle body so as to extend vertically and turn about an axis. A steering swivel, a driving operation unit provided on the upper part of the steering swivel for the driver to hold and operate by hand, and traveling for switching a rotation direction of the electric motor based on an operation state of the driving operation unit. A steering operation member having a left-right end fixed to an upper portion of the turning shaft and extending rightward or leftward, wherein the driving operation portion is remote from the turning shaft of the steering operation member; A switching operation member attached to the other end so as to be rotatable about a vertical axis and extending to the turning shaft side, and the switching operation member is set to a predetermined neutral position with respect to the steering operation member. Hold in position Neutral position holding means, wherein the traveling control means includes a forward operation in which the switching operation member is rotated forward with respect to the steering operation member, and the switching operation member includes a steering operation member. Operation detecting means for detecting a reverse operation that has been turned rearward on the other hand, and when the forward detecting operation is detected by the operation detecting means, the motor is rotated in the forward direction, and the reverse operation is performed by the detecting means. An electric carrier, wherein the electric motor is rotated in a reverse direction when the electric motor is detected.