JP2016117420A - Carriage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carriage which has driving wheels driven by a motor, can suppress a placing surface at a low level, even if a lift mechanism and the like on which heavy article is placed is provided, and can reduce a carrying burden of a user.SOLUTION: A carriage has a loading platform 110 which has a plurality of driven wheels 111 and 112 on a lower part; an operation handle 140 operated by a user; and driving wheels 130 driven by a motor 131. Behind the loading platform 110, a rear base frame 120 is provided. The driving wheels 130 are provided on the rear base frame 120 so as to freely change directions, and the operation handle 140 is provided so as to steer the driving wheels 130.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a transport cart having a cargo bed body having a plurality of driven wheels, an operation handle, and drive wheels driven by a motor.

2. Description of the Related Art A transport cart is known in which a load is placed on a cargo bed body having a plurality of driven wheels below, and a user moves the load with an operation handle to carry the load.
In addition, when the load to be transported is heavy, or when the platform body is equipped with a lift mechanism or the like, the weight of the entire transport cart is increased. A transport cart with a reduced transport load is also known (see, for example, Patent Document 1).

In the transport cart (transport cart 1) known in Patent Document 1, an operation handle (handle 6 and handle support 7) is provided at the rear of the load carrier body (base 2), and the direction is freely changed to the rear side of the lower surface of the load carrier body. Two possible free wheels (free casters 5) and a fixed wheel (fixed casters 4) that cannot change direction are provided on the front side.
The motor (9), the motor control unit (control unit 14), and the drive wheel (drive wheel 11) driven by the motor are provided at the center of the lower surface of the cargo bed body, and the user's carrying load Has been reduced.

JP 2001-2111519 A

Such a carriage equipped with a known drive wheel includes a motor, a motor control unit, and a drive wheel driven by the motor on the lower surface side of the load carrier body. The height of the loading surface of the load is increased, and there is a problem that it is necessary to lift the load excessively when the load is placed on the loading platform body.
Further, when a lift mechanism for raising and lowering the load is provided on the cargo bed body, the position of the loading surface on the upper surface of the lift mechanism is further increased, and a space for installing devices such as a control device and a power source for the lift mechanism is also required. .

For example, by adopting a mechanism using a meshing chain as the lift mechanism, it is possible to reduce the height of the lift mechanism itself, but in order to cope with the weight increase due to the lift mechanism, its control equipment, power supply, etc. The drive mechanism needs to be further increased in size, and the control mechanism, power supply, etc. must be provided in the space on the lower surface side, so that the drive wheels are provided on the lower surface side while suppressing the height of the cargo bed body. It was difficult.
In addition, as the weight increases, the user needs a large force when steering, and there is a problem that the user's transportation load increases.

  The present invention solves these problems, and has a driving wheel driven by a motor, and even when a heavy object is placed or a lift mechanism is provided, the placement surface can be kept low. An object of the present invention is to provide a transport cart that can be used and can reduce the transport load on the user.

  A transport cart according to the present invention is a transport cart having a load carrier body having a plurality of driven wheels, an operation handle, and a drive wheel driven by a motor, and a rear carriage is provided behind the load carrier body. The drive wheel is provided on the rear frame so as to be freely changeable, and the operation handle is provided so as to steer the drive wheel.

According to the transport cart according to the first aspect of the present invention, the rear frame is provided on the rear side of the cargo bed body, and the driving wheels are provided on the rear frame so as to be able to freely change the direction of the carriage body. There is no need to provide a drive wheel other than the driven wheel or any other configuration, and the drive mechanism has been increased in size in order to cope with an increase in weight when a heavy load is placed on the cargo bed body or a lift mechanism is provided. Even in this case, it is possible to reduce the height of the loading platform body and to suppress the height of the mounting surface.
In addition, since the operation handle is provided so as to steer the driving wheel, even when a heavy object is placed or a lift mechanism is provided, the user can easily steer and transport the user. The load can be reduced.

According to the configuration of the second aspect of the present invention, the drive wheels are provided so as to be steerable via the suspension with respect to the rear frame, so that the load condition of the transport carriage and the floor condition of the travel location are not affected. In addition, since the driving wheel contacts the floor with a stable contact pressure, the driving force can be reliably transmitted to the floor, the force required to steer the driving wheel is stabilized, and the load on the user is reduced. can do.
According to the configuration of the third aspect of the present invention, the plurality of driven wheels include a free wheel provided on the rear side and capable of freely changing the direction, and a fixed wheel provided on the front side and not capable of changing the direction. It is possible to steer the transport carriage accurately and stably by steering the driving wheel while minimizing slippage of the driving wheel, and the transport load on the user can be reduced.
According to the configuration of the fourth aspect of the present invention, the control device and the power source for driving the drive wheels are provided on the rear frame, so that the control device can be used even when no load is placed. In addition, an appropriate ground pressure can be generated on the driving wheel by the weight of the power source, and the driving force can be reliably transmitted to the floor surface.
In addition, since the operation unit for driving the driving wheel is provided on the operation handle, the user can operate the speed, the driving direction, and the like of the driving wheel without removing the hand from the handle. The transportation load can be reduced.
Furthermore, since the power supply for driving is mounted, there is no need to supply power from the outside, and the freedom of movement is improved.

According to the configuration described in claim 5, the cargo bed body is provided with the lift mechanism, and the control device and the power source for driving the lift mechanism are provided on the rear frame, so that the load can be transferred. Even when the vehicle is not mounted, an appropriate ground pressure can be generated on the driving wheel by the weight of the control device and the power source, and the driving force can be reliably transmitted to the floor surface.
In addition, since the power supply for the lift mechanism is mounted, it is not necessary to supply power from the outside, and the lift mechanism can be operated at any position.
Furthermore, the control device and the power source for driving the lift mechanism can be integrated with the control device and the power source for driving the driving wheels, or a part of the control device and the power source can be shared. Can be reduced, and a compact configuration can be achieved.
According to the configuration of the sixth aspect of the present invention, since the lift mechanism uses the meshing chain, the height dimension of the lift mechanism is reduced, and the height of the mounting surface when the lift mechanism is lowered is further increased. It can be kept low.
According to the structure of this Claim 7, it has a fall prevention mechanism provided with the fixed leg member which can be raised / lowered on the both sides of a back frame at the outer side of the said load body main body in the width direction, When loading or unloading, the fixed leg member is lowered to the floor surface, so that the transport cart can be stopped reliably, prevented from moving or falling, and the safety of the user can be ensured.
In particular, since the fixed leg member can be moved up and down on the outer side in the width direction, even when the load is raised by the lift mechanism, it is possible to reliably prevent the fall.
According to the configuration of the eighth aspect of the present invention, the drive motor is broken in a state in which only the plurality of driven wheels are grounded by having the drive wheel lifting mechanism that raises the drive wheels to a height at which the drive wheels are not grounded. In such a case, or when towing with another cart, the cart can be easily moved.
Further, by operating together with the lift mechanism, it is possible to perform maintenance and the like by lifting the drive wheels.

The side view of the conveyance trolley which concerns on one Embodiment of this invention. The top view of the conveyance trolley which concerns on one Embodiment of this invention. The front view of the conveyance trolley which concerns on one Embodiment of this invention. The rear view of the conveyance trolley | bogie which concerns on one Embodiment of this invention. The expanded side view of the handle | steering-wheel and driving wheel of the conveyance trolley which concern on one Embodiment of this invention. The enlarged rear view of the handle | steering-wheel and driving wheel of the conveyance trolley which concern on one Embodiment of this invention. The enlarged plan view of the handle | steering-wheel and driving wheel of the conveyance trolley which concern on one Embodiment of this invention.

As shown in FIGS. 1 to 4, the transport cart 100 according to one embodiment of the present invention includes a cargo bed body 110, an operation handle 140, and drive wheels 130 driven by a motor 131.
A rear frame 120 is provided at the rear of the cargo bed body 110, the drive wheels 130 are provided on the rear frame 120 so as to be freely changeable in direction, and the operation handle 140 is provided to steer the drive wheels 130. .
On the lower surface side of the cargo bed main body 110, a plurality of driven wheels including a free wheel 112 that can freely change the direction of the rear side and a fixed wheel 111 that cannot change the direction of the front side are provided.
A control unit 125 that accommodates a control device for driving a lift mechanism 150 described later, and a battery 127 that is a power source of a lifting motor of the lift mechanism 150 and the motor 131 are mounted on the load carrier body 110 side on the rear frame 120. Is placed.
Since these heavy objects are on the loading platform main body 110 side on the rear frame 120, only a part of the large weight is applied to the driving wheels 130, so that adverse effects on the driving force and the steering force of the operator are adversely affected. An appropriate ground pressure can be applied to the drive wheel 130 while reducing the amount.
On both sides below the part on which the control unit 125 of the rear underframe 120 is placed, there is provided a fall prevention mechanism 121 including a fixed leg member 122 that protrudes outward in the width direction of the cargo bed body 110 and can be raised and lowered. Yes.

As shown in FIGS. 5 to 7, the drive wheel 130 is directly driven via a drive shaft 132 by a motor 131 attached to the drive wheel support base 134.
A scraper 133 is provided below the drive wheel support base 134 so as to cover the periphery of the drive wheel 130.
Even if there is a fallen object on the floor surface by the scraper 133, it can be removed without contacting the driving wheel 130, and the feet and hems of the user who operates near the driving wheel 130 are driven. It is possible to prevent the ring 130 from coming into contact with or being involved.
As shown in FIG. 6, the drive wheel support base 134 is fixed to the steering shaft 135, and the steering shaft 135 is supported by the steering bearing 123 including the suspension 124 so that it can freely change its direction and slide up and down. Has been.

The operation handle 140 is fixed to the upper end of the steering shaft 135 via a folding mechanism 142, and the upper end portion of the operation handle 140 is formed in a T shape with the gripping portions 143 on both sides.
The folding mechanism 142 may be any as long as it has sufficient strength when the operation handle 140 is upright, and may be omitted.
The grip portion 143 is provided with a drive control switch 141 that is an operation portion of a motor 131 that drives the drive wheel 130.
Further, an elevation control switch 126 that is an operation unit for driving the lift mechanism 150 is disposed on a side surface of the control unit 125.

The cargo bed main body 110 is provided with a lift mechanism 150.
The lift mechanism 150 uses a known meshing chain feed / retraction as a lifting drive source, and includes a lifting table 151 and a meshing chain drive unit 152.
The meshing chain 153 is composed of a plurality of chains that can mesh with each other. The meshing chain 153 is housed in the meshing chain drive unit 152 in a state where it is disengaged and can be bent. And is lifted upward to raise the lifting table 151.

On the upper surface side of the elevating table 151, a load mounting table 156 is provided via a mounting table position adjusting mechanism 157.
The mounting table position adjustment mechanism 157 has an XY biaxial slide mechanism and a rotation mechanism in the XY plane, so that it is possible to carry the load even if the transport carriage 100 itself is not accurately aligned during loading and unloading. The mounting table 156 can be accurately aligned.
In addition, a mechanism for detecting a relative position between the lifting table 151 and the load mounting table 156, a fixing mechanism, and the like are provided to ensure safety during movement.
Further, a cover 155 that can be expanded and contracted in accordance with the lifting and lowering of the lifting table 151 is provided around the lift mechanism 150. It is preventing that.

Since the drive motor 131 is steered integrally with the drive wheel 130, the power cable 128 from the control unit 125 to the drive motor 131 is routed so that a sufficient steering angle can be obtained.
That is, the power cable 128 extends from the control unit 125 through the rear frame 120 to the drive wheel support base 134, and as shown in FIG. 1, FIG. 2, FIG. 5, FIG. The upper part is loosely wound a plurality of times and connected to the drive motor 131.
As a result, even when the steering wheel is largely steered to the left or right, only the diameter of the loosely wound portion of the power cable 128 above the driving wheel support base portion 134 is changed, and other portions are loosened or bent. There is nothing.
In addition to the power cable 128, a control cable (not shown) extending to the drive control switch 141 is similarly routed.
Since the cable does not move between the drive wheel support base 134 and the control unit 125, the drive motor 131, and the drive control switch 141 by steering, if the cable is fixed around any place where it does not interfere with work or operation, Good.

According to the transport cart of the present invention configured as described above, even when a heavy object is placed or a lift mechanism or the like is provided, the placement surface can be kept low, and the user's transport load Can be reduced.
In the above-described embodiment, the drive wheel 130 is directly driven by the motor 131 via the drive shaft 132. However, the motor is disposed at another location and driven via a transmission mechanism such as a gear or a chain. Also good.
The drive wheel 130 is a single wheel and is configured to be directly steered by the operation handle 140. However, the drive wheel may be steered via a steering transmission mechanism, or two or more drive wheels may be provided. Good.
As for the drive wheel raising / lowering mechanism, for example, an appropriate structure such as a mechanism for compressing the suspension 124 and raising and fixing the drive wheel 130 and a mechanism for raising and lowering the steering bearing 123 itself with respect to the rear frame 120 are provided. Should be adopted.

The control unit 125 is placed on the load carrier body 110 side on the rear underframe 120. However, as long as the placement surface can be suppressed to a low level, the control unit 125 may be provided at other locations including the load carrier body 110. Each component such as a power source may be distributed and arranged in various places.
Although the lift mechanism 150 is a mesh chain, it may have any structure and may not have a lift mechanism.
The plurality of driven wheels of the cargo bed main body 110 are composed of a rear-side free wheel 112 and a front-side fixed wheel 111, and the number and position of the driven wheels, any of which is a fixed wheel or a free wheel. Also, it may be designed freely in consideration of the steering characteristics according to the magnitude of the load and the purpose of use.
The drive control switch 141 and the elevation control switch 126 may be freely arranged in consideration of the cost, safety, convenience according to the usage form, and the like.
The fall prevention mechanism 121 is provided on both sides below the portion of the rear frame 120 on which the control unit 125 is placed. However, the fall prevention mechanism 121 may be provided in another place or the number thereof may be increased. There may be.
Further, when there is no danger of an accident due to a fall or movement, the fall prevention mechanism 121 may be omitted.

DESCRIPTION OF SYMBOLS 100 ... Carriage cart 110 ... Cargo body 111 ... Fixed wheel (driven wheel)
112 ・ ・ ・ Swivel wheel (driven wheel)
120 ... Back frame 121 ... Fall prevention mechanism 122 ... Fixed leg member 123 ... Steering bearing 124 ... Suspension 125 ... Control unit 126 ... Elevation control switch 127 ... Battery (Power supply)
128 ・ ・ ・ Power cable 130 ・ ・ ・ Driving wheel 131 ・ ・ ・ Driving motor 132 ・ ・ ・ Driving shaft 133 ・ ・ ・ Scraper 134 ・ ・ ・ Driving wheel support base 135 ・ ・ ・ Steering shaft 140 ・ ・ ・ Operation handle 141・ ・ ・ Drive control switch 142 ・ ・ ・ Folding mechanism 143 ・ ・ ・ Grip part 150 ・ ・ ・ Lift mechanism 151 ・ ・ ・ Lifting table 152 ・ ・ ・ Meshing chain drive unit 153 ・ ・ ・ Meshing chain 154 ・ ・ ・ Lifting drive Motor 155 ... Cover 156 ... Loaded object mounting table 157 ... Mounting table position adjusting mechanism

Claims (8)

A carrier cart having a cargo bed body having a plurality of driven wheels, an operation handle, and driving wheels driven by a motor,
A rear frame is provided behind the cargo bed body,
The drive wheel is provided on the rear underframe so as to be freely changeable in direction,
The transport cart, wherein the operation handle is provided to steer the drive wheel.   The transport cart according to claim 1, wherein the driving wheel is provided so as to be steerable with respect to the rear frame via a suspension.   The plurality of driven wheels include a free wheel provided on a rear side and capable of freely changing a direction, and a fixed wheel provided on a front side and not capable of changing a direction. Carriage truck. A control device and a power source for driving the drive wheels are provided on the rear frame,
4. The transport cart according to claim 1, wherein an operation unit for driving the drive wheel is provided on the operation handle. 5. The loading body is provided with a lift mechanism,
5. The transport cart according to claim 1, wherein a control device and a power source for driving the lift mechanism are provided on the rear frame.   The transport cart according to claim 5, wherein the lift mechanism uses a meshing chain.   The fall prevention mechanism provided with the fixed leg member which can be raised / lowered on the both sides of the said back frame at the outer side of the said load body main body in any one of Claim 1 thru | or 6 characterized by the above-mentioned. The listed transport cart.   The transport carriage according to any one of claims 1 to 7, wherein the rear carriage has a drive wheel lifting mechanism that raises the drive wheel to a height that does not contact the ground.

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