JP2013052706A - Self-propelled cart - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a self-propelled cart in which a single wheel is used as a front wheel and a baggage housing basket is not fixed to a handle but is made independent of the handle to facilitate handle operation.SOLUTION: Rear wheels 2 and 2a are provided at right and left parts of a rear part of a vehicle body frame 1, the turnable front wheel 3 is provided at front end center part of the vehicle body frame 1, the baggage housing basket 4 is fixedly disposed at a front part upper part of the vehicle body frame 1, steering rod 21 having a handle 20 on its upper end is disposed on a rear side of the baggage housing basket 4, the steering rod 21 and the front wheel 3 are linked by a link device 22, and a saddle 32 is disposed and a driving device 33 of the rear wheels 2 and 2a are provided on the rear side of the steering rod 21.

Description

  The present invention relates to a self-propelled cart in which a shopping cart used for shopping is mainly improved in a large-scale retail store such as a shopping center or a shopping mall.

  Conventionally, in a large-scale retail store, as shown in Patent Document 1, a cart having a pair of front and rear casters, and a bottom surface having substantially the same area as a cart projecting forward on the upper part of a support column standing on the rear left and right of the cart 2. Description of the Related Art A shopping cart mainly composed of a luggage container having a portion and a bar-like handle erected between the upper ends of the columns is used.

  This shopping cart is a wheelbarrow, so it is convenient to use it in a large-scale retail store with a very large site area. I often see people pushing a shopping cart.

  Therefore, if this shopping cart is made to be self-propelled like a bicycle, it can be moved while sitting down, which is thought to reduce the burden on the elderly.

Patent Document 2 discloses a three-wheeled vehicle for carrying goods, in which two wheels are arranged at the front, a cargo bed is provided at the top, and one wheel and a saddle are provided at the rear.
In this tricycle, wheels are attached to the left and right lower portions of the loading platform, and a handle is erected at the rear of the loading platform.

JP 2003-170834 A Japanese Utility Model Publication No. 60-182273

However, the tricycle of Patent Document 2 has a problem that when a large amount of luggage is placed on the loading platform, the handle integrally connected to the loading platform is heavy and the steering operation cannot be performed as expected.
Therefore, an object of the present invention is to provide a self-propelled cart in which the front wheel is a single wheel and the handle is easily operated without being fixed to the handle without fixing a luggage container.

In view of the above problems, the self-propelled cart of the present invention has rear wheels on the left and right of the rear part of the body frame, a front wheel that can change direction at the center of the front end of the frame, and a luggage storage rod fixed above the front part of the body frame. A steering rod having a handle at the upper end is arranged behind the luggage storage rod, the steering rod and the front wheel are connected by a link device, a saddle is arranged behind the steering rod, and the rear A wheel drive device is provided.
In addition, the rear part of the luggage storage box is inclined rearward, and the upper half of the steering wheel is inclined rearward along the rear part, and is supported rotatably by bearings provided above and below the rear part. The lower end of the part and the upper end of the lower half of the steering rod that is upright by connecting the lower end to the link device below the luggage container are connected by a universal joint.
The drive device includes a pair of left and right cranks whose front ends provided with pedals are directed in opposite directions, a crank shaft pivotally supported below the saddle with the base ends of the cranks fixed to the left and right ends, and the crank It is characterized by comprising a transmission mechanism unit that links the shaft and the axle of the rear wheel.
Further, the transmission mechanism section is characterized by comprising a winding transmission that transmits forward and reverse rotation of the crankshaft to the rear wheel axle.
In addition, a baggage storage pedestal on which a baggage can be placed is provided below the baggage bag and directly above the link device.

In short, the present invention provides a rear wheel on the left and right of the rear part of the body frame, a front wheel that can change direction at the center of the front end of the body frame, a fixed luggage storage box above the front part of the body frame, A steering rod with a handle at the upper end is arranged at the rear, and the steering rod and the front wheel are connected by a link device, so that the front wheel is a single wheel that is easy to handle, and the luggage storage rod is not fixed to the handle. For example, a relatively large luggage container that occupies the first half of the body frame is equipped, and even if the contents in the luggage container are heavy, the steering wheel is easily steered with a relatively light force to move the front wheel Can be directed to the destination.
In addition, since a saddle is disposed behind the steering rod and a rear wheel drive device is provided, the self-propelled cart of the present invention is operated while sitting by sitting on the saddle and driving the drive device. be able to.

The rear part of the luggage storage box is inclined backward, and the upper half of the steering wheel is inclined backward along the rear part, and is supported rotatably by bearings provided above and below the rear part. The lower end of the steering rod is directed to the lower side of the luggage storage rod, the lower half of the steering rod connected to the lower end of the upper half of the steering rod vertically through a universal joint, and the lower half of the steering rod connected to the lower end of the steering rod. The rear part of the link device can be arranged below the luggage container.
As a result, the space between the luggage storage rod and the saddle, i.e., the user's boarding space, can be increased compared to the case where the steering rod is disposed upright behind the luggage storage rod. In addition, when getting on and off, it is safe without the user's feet getting caught in the rear part of the link device connected to the lower half of the steering rod or the lower end thereof.

  The driving device includes a pair of left and right cranks whose front ends provided with pedals are directed in opposite directions, a crank shaft that is pivotally supported below the saddle with the base ends of the crank fixed to the left and right ends, and the crank shaft And the rear wheel axle, the crankshaft is rotated by depressing the left and right pedals, and this rotational force is transmitted to the rear wheel via the transmission mechanism. While sitting, the self-propelled cart of the present invention can be driven by itself.

  Since the transmission mechanism section is composed of a winding transmission that transmits forward and reverse rotation of the crankshaft to the rear wheel axle, the forward rotation of the crankshaft is rotated forward and reverse by a pedal so that the rear wheels are forward and backward via the winding transmission. Since the cart can be rotated in the reverse direction, the cart can move forward and backward, and the operability of the cart can be further improved.

  A luggage storage pedestal on which the luggage can be placed is provided below the luggage storage box and directly above the link device, so that the product can be placed on the luggage storage pedestal in the same manner as a conventional shopping cart without any trouble in the operation of the link device. Such as a basket containing luggage such as a bag or a luggage can be directly accommodated.

It is a partially broken side view of the self-propelled cart concerning the present invention. It is AA sectional drawing of FIG. FIG. 5 is a cross-sectional view taken along line BB in FIG. It is a principal part enlarged plan view which shows the connection state of a steering wheel and a front wheel.

An embodiment of the present invention will be described below with reference to the drawings.
The self-propelled cart according to the present invention is provided with rear wheels 2 and 2 a on the left and right of the rear part of the body frame 1, a front wheel 3 capable of changing direction at the center of the front end of the body frame 1, and a vehicle body above the front part of the body frame 1. A relatively large luggage container 4 having an area substantially in the first half of the frame 1 is fixedly arranged via support columns 5 and 5a erected from the body frame 1.

  The body frame 1 is configured by assembling square pipes into a predetermined shape, and the illustrated example has a pair of left and right basic sides 7 that are long in the front and rear and arranged in parallel via a short front end 6 at the front and rear ends. 7a is provided at the center, and rear ends 8 of the basic sides 7 and 7a are provided at the rear ends of the rear ends 8 that are parallel to the front end sides 6 and longer to the left and right. A left side 9 and a right side 9a that are slightly shorter than a half length of the left side 9 and the right side 9a are formed to extend forward, and are inclined between the front ends of the left and right sides 9 and 9a and the middle part of the main sides 7 and 7a. Sides 10 and 10a are installed.

  The rear wheels 2 and 2a have their axles 11 and 11a supported at the rear lower portions of the left and right sides 9 and 9a, and the right axle 11a is formed to extend to the left side of the left main side 7 and has its left end The side is supported by the lower part of the left trunk side 7.

The front wheel 3 is formed to have the same diameter as the rear wheels 2 and 2 a, and its axle is supported by the front fork 12.
A support shaft 13 is formed upright at the upper end of the front fork 12, and the support shaft 13 is rotatably supported by a front end of a rectangular plate-like bracket 14 that is adjusted in height on the front end side 6 and protrudes forward. Thus, the front wheel 3 can be freely changed in direction.

  Further, the columns 5 and 5a are erected from the front ends of the left and right sides 9 and 9a and bent forward and bent in the middle, and are integrally connected to the substantially U-shaped lower frame 15 of the baggage storage basket 4, thereby A luggage storage trough 4 is fixedly arranged above the front part of 1.

Rear pillars 16 and 16a which are inclined rearward are erected on the bent portions of the pillars 5 and 5a, and between the rear parts of the lower frame 15 corresponding to the lower part of the rear pillars 16 and 16a and above the rear pillars 16 and 16a. Lateral rods 17 and 17a are installed between the parts.
In the rear columns 16 and 16 a, the base end of the upper frame 18 having the same plan view shape as the lower frame 15 is fixed at the same height position as the upper horizontal hand rod 17.
A luggage container 4 is configured by assembling a lattice having a predetermined shape between the upper frame 18 and the lower frame 15, between the lateral handles 17 and 17 a, and inside the lower frame 15.

In FIG. 2, for the sake of convenience, only the rear lattice that is inclined rearward of the luggage container 4 is shown, and the other lattices are omitted.
A reinforcing rod 19 is installed between the upper ends of the rear columns 16 and 16a.

  A steering rod 21 having a handle 20 at its upper end is disposed behind the luggage storage rod 4, and the steering rod 21 and the front wheel 3 are connected by a link device 22.

The steering rod 21 includes an upper half portion 21a and a lower half portion 21b. The upper half portion 21a is inclined rearwardly along the rear portion of the luggage storage rod 4, and the upper and lower auxiliary rods 19 and the lower side rod 17a at the rear portion. Are rotatably supported by bearings 23 and 23a provided in the middle.
The lower half 21b has a lower end supported rotatably and upright at the center of a bracket constructed between the upper surfaces of the trunk sides 7 and 7a corresponding to the lower part of the rear part of the luggage container 4.
The lower end of the upper half 21a and the upper end of the lower half 21b are connected by a universal joint 24.

  The link device 22 includes a short front lateral link 25 that is horizontally fixed around the support shaft 13 of the front fork 12, and the same length as the front lateral link 25 at the same height and centering on the lower end of the lower half 21b. It is composed of a fixed rear lateral link 26 and longitudinal links 27 and 27a having the same length in which the left and right ends of the front and rear lateral links 25 and 26 are pivotally connected.

The vehicle body frame 1 is provided with a luggage storage pedestal 28 on which a luggage (not shown) can be placed at a position directly below the luggage storage box 4 and directly above the link device 22.
This luggage storage pedestal 28 has a base end of a substantially U-shaped pedestal frame 29 similar to the upper and lower frames 15, 18 projecting forward from the lower ends of the columns 5, 5 a in an upwardly inclined manner. It is fixed to the lower end of 5a.

Then, bending rods 30 and 30a that are inclined forward are provided between the left and right sides of the pedestal frame 29 and the lower frame 15, respectively, below the forward inclined portion of the bending rods 30 and 30a, and on the inner front side of the pedestal frame 29. Thus, the luggage storage pedestal 28 is configured by arranging a net shelf 31 having a predetermined shape in a portion that does not contact the link device 22.
Space holding members 29a and 29b are installed on the left and right front ends of the base frame 29 and the outer front ends of the trunk sides 7 and 7a.

In the body frame 1, a saddle 32 is disposed behind the steering rod 21, and a drive device 33 for the rear wheels 2 and 2a is provided.
The saddle 32 is provided at the upper end of a standpipe 34 erected on the main sides 7 and 7a behind the steering rod 21.

  The drive device 33 includes a pair of left and right cranks 36, 36a whose front ends are provided in opposite directions with pedals 35, 35a, and the base ends of the cranks 36, 36a are fixed to the left and right ends, and are moved forward below the vertical pipe 34. The crankshaft 37 is pivotally supported by the projecting bracket 34a, and the transmission mechanism 38 connects the crankshaft 37 and the axle 11a of the right rear wheel 2a.

  The transmission mechanism 38 is a winding transmission that transmits forward and reverse rotation of the crankshaft 37 to the axle 11a of the rear wheel 2a, that is, a sprocket 39 that is pivotally attached to the crankshaft 37, a sprocket 39a that is pivotally attached to the axle 11a, An endless chain 40 spanned between the sprockets 39, 39a.

  In this embodiment, a brake system is not provided, but, as in the conventional bicycle, a brake device is provided on one or both of the front wheels and the rear wheels, and the brake device is connected via an operation wire. A remotely operated brake lever may be attached to the handle.

  The self-propelled cart configured as described above is provided on the load storage case 4 and the load storage base 28 provided below the load storage case 4 and directly above the link device 22 so as not to interfere with the operation thereof. In addition, goods such as goods can be directly accommodated, or they can self-propelled while being accommodated in the baskets arranged on the luggage compartment 4 or the luggage accommodation pedestal 28.

  That is, the user sits on the saddle 32, grasps the handle 20 with both hands, and alternately depresses the left and right pedals 35, 35a to rotate the cranks 36, 36a, the crankshaft 37, and the sprocket 39, and this rotation is endless. It is transmitted to the axle 11a via the chain 40 and the sprocket 39a to drive the rear wheel 2a.

  Since the front wheel 3 is connected to the handle 20 via the link device 22 and the steering rod 21, by rotating the handle 20 left and right, the steering rod 21 rotating in the same direction causes the rear lateral link 26 to move left and right. This swinging causes the front lateral link 25 to swing in the same direction via the longitudinal links 27, 27a, and the front wheel 3 attached to the front lateral link 25 via the support shaft 13 and the front fork 12 is It is directed in the same direction as the handle 20, and advances in that direction by driving the rear wheel 2a.

  Since the driving device 33 is a fixed gear in which the movement of the pedals 35 and 35a and the wheel 2a are directly connected, if the sprocket 39 is rotated forward and backward by depressing the pedal 35 and 35a, the wheel 2a is also rotated forward and backward in the same manner. Therefore, it is possible to move forward or backward.

  Further, even when the handle 20 is rotated, the luggage storage rod 4 is not fixed to the steering rod 21 connected to the handle 20, and is supported rotatably by bearings 23 and 23a provided at the upper and lower portions of the rear portion, and Because the front wheel is a single wheel that changes direction compared to the two wheels, it has less friction with the ground. The steering wheel 20 can be easily steered to direct the front wheel 3 in the desired direction.

  And since the steering rod 21 is rotatably arranged as described above along the rear portion where the upper half portion 21a is inclined rearward of the luggage storage rod 4, the lower end of the upper half portion 21a is disposed at the lower end of the luggage storage rod 4a. The lower half portion 21b of the steering rod 21 whose upper end is vertically connected to the lower end of the upper half portion 21a via the universal joint 24, and the rear portion of the link device 22 connected to the lower end thereof In other words, the rear lateral link 26 can be disposed below the rear part of the luggage container 4.

  As a result, the space between the luggage storage rod 4 and the saddle 32, that is, the user's boarding (especially the legs 35, 35a for rotating the pedals) is compared with the case where the steering rod 21 is arranged upright behind the luggage storage rod 4. Part) because the space can be made large, it is not necessary to make the body frame 1 large, and the rear part of the link device 22 connected to the lower half 21b of the steering rod 21 and its lower end (rear side lateral link 26, and so on) The user's feet are not caught on the rear ends of the vertically long links 27 and 27a that are pivotally connected.

1 Body frame 2, 2a Rear wheel 3 Front wheel 4 Luggage storage
11, 11a axle
20 Handle
21 Steering rod
21a Upper half
21b Lower half
22 Link device
23, 23a Bearing
24 universal joints
28 Luggage storage pedestal
32 saddles
33 Drive unit
35, 35a pedal
36, 36a crank
37 Crankshaft
38 Transmission mechanism

Claims (5)

  A rear wheel is provided on the left and right of the rear part of the body frame, a front wheel that can change direction is provided at the center of the front end of the body frame, a luggage storage box is fixedly disposed above the front part of the body frame, and a handle is provided at the upper end behind the luggage storage box. A steering rod provided with a steering wheel is connected to the front wheel by a link device. A saddle is arranged behind the steering rod and a driving device for the rear wheel is provided. Running cart.   The rear part of the luggage container is inclined backward, the upper half of the steering wheel is inclined backward along the rear part, and is supported rotatably by bearings provided above and below the rear part. 2. The self-propelled cart according to claim 1, wherein a lower end and an upper end of a lower half portion of a steering rod which is connected to the lower end of the link device below the luggage storage rod and stands upright are connected by a universal joint. .   The drive device includes a pair of left and right cranks whose front ends provided with pedals are directed in opposite directions, a crank shaft that is fixedly attached to the left and right ends of the crank and pivotally supported below the saddle, and the crank shaft 3. The self-propelled cart according to claim 1, further comprising a transmission mechanism unit that connects the rear wheel axle.   4. The self-propelled cart according to claim 3, wherein the transmission mechanism portion is a winding transmission device that transmits forward and reverse rotations of the crankshaft to the axle of the rear wheel.   The self-propelled cart according to claim 1, 2, 3, or 4, further comprising a luggage storage pedestal on which a luggage can be placed at a position below the luggage storage bowl and directly above the link device.

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