JP2021172160A - Carrier cart - Google Patents

Abstract

To develop a hand-push carrier cart capable of readily riding over a step present on a transportation road surface.SOLUTION: A hand-push carrier cart includes a load carrying platform, wheels located back, forth, leftward, and rightward, and a lifting wheel having a lift. The lifting wheel is located at least at the center below the load carrying platform, and stretches or contracts in a vertical direction. The lift of a jack type that stretches or contracts is interposed between the lifting wheel and load carrying platform.SELECTED DRAWING: Figure 1

Description

The present invention relates to a transport trolley. In particular, it relates to a hand-push type overcoming trolley that can get over a step.

At the construction site under construction, there are many steps on the floor, and a slope is installed on the steps to get over the transport trolley. The movement route will be limited. Several transport trolleys have been proposed that can overcome steps without relying on slopes.
In Patent Document 1 (Japanese Unexamined Patent Publication No. 2017-3383), a carrier for overcoming a step is provided with an acceleration sensor as a step detecting device and an elevating drive wheel equipped with an actuator for overcoming the step on the front and rear caster wheels. Is disclosed.
In Patent Document 2 (Japanese Unexamined Patent Publication No. 2001-71910), a loading platform, a handle frame extending substantially vertically from the rear portion of the loading platform, and left and right positions located directly below the handle frame and supported so as to be transferable to the road surface. Overcoming steps when the bogie is retracted, with the main and rear wheels of the dolly and the left and right auxiliary rear wheels that are located above and behind each main and rear wheel and are supported so that they can be transferred to the protrusions on the road surface. A dolly that is easy to use and can prevent the luggage from falling is disclosed.
Patent Document 3 (Japanese Unexamined Patent Publication No. 2001-262202) describes an arm that is swingably attached to the vehicle body in the vertical direction, and at least four wheels that are rotatably attached to the arm and arranged in the traveling direction. Disclosed are step-over climbing casters with a twisted rubber bush that urges the arm so that one wheel touches the ground and the other wheel floats.
Patent Document 4 (Japanese Unexamined Patent Publication No. 10-181609) has a step in which wheels are arranged in the front and rear and in the middle of the bogie, and the intermediate wheels are raised and lowered by a link or the like so that the front wheels and the rear wheels can be easily lifted. A transport trolley capable of overcoming a step that can run on a floor surface is disclosed.

FIG. 4 shows an example of a failure at a construction site. An example of a high obstacle existing in the transport path is a square lumber (a), and an example of a slightly low obstacle is a paving iron plate (b). In addition, wires such as cords and wires and pipe materials are often present.
In a normal transport trolley, it is necessary to lift the front wheels to overcome these obstacles in some way. At construction sites, large heavy objects are often carried in using a crane or the like for installation. Most of the materials to be transported in the construction site are interior materials, temporary materials, packaging materials and waste materials, and it is necessary to carry them flexibly, and the weight of a hand-held transport trolley is often 500 kg or less.
Normally, it is said that a wheel can be pushed over at a height of about 1/3 of the diameter of the wheel, and in the case of a wheel with a diameter of 100 mm, a laid iron plate or cords having a diameter of 30 mm or less can be overcome. Single pipes and square lumbers are 30 mm or more and cannot be easily overcome. Even cords may be covered with a protective material of 30 mm or more in order to prevent electric leakage or electric shock due to being stepped on and damaged.
At construction sites, there is an increasing need to improve the operability of hand-held transport trolleys due to labor saving and aging of workers.

Japanese Unexamined Patent Publication No. 2017-3383 Japanese Unexamined Patent Publication No. 2001-71910 Japanese Unexamined Patent Publication No. 2001-262202 Japanese Unexamined Patent Publication No. 10-181609

The purpose is to develop a hand-push type transport trolley that can easily get over the steps on the transport road surface.

The main configurations of the present invention are as follows.
1. 1. It ’s a push-type transport trolley.
It is equipped with a loading platform, wheels provided on the front, back, left and right, and an elevator wheel with an elevator.
The elevating wheel is provided at least in the lower part of the loading platform and in the center of the loading platform, and is a lifting wheel that expands and contracts in the vertical direction. Transport trolley.
2. The wheels provided on the front, rear, left and right are characterized in that at least the legs of the left and right wheels are connected by a wheel frame. Described transport trolley.
3. 3. The elevator has a drive system having a drive shaft, and an operation unit of the drive shaft is provided at the end of the transport carriage.
The drive source of the drive shaft is a manual rotating means, a motor, or a detachable rotating tool. Or 2. Described transport trolley.
4. The jack is a screw jack that expands and contracts the shaft with a screw. ~ 3. The transport trolley described in any of.
5. The drive system is characterized by having a gearbox having a gear ratio of 10: 1 to 40: 1. ~ 4. The transport trolley described in any of.

1. 1. By providing an elevating wheel with a jack below the center of the loading platform, we were able to develop a hand-push type transport trolley that can easily overcome steps.
When climbing a step, the elevating wheel is extended just before the step to tilt backward and the front wheel is placed on the step, the elevating wheel is shortened and the elevating wheel is placed on the step, and the rear wheel is placed on the step while pushing up. , Can climb steps.
When going down a step, shorten the elevating wheel just before the step, lower the front wheel from the step in a forward leaning state, move it forward a little, extend the elevating wheel to touch the ground, and lower the advanced rear wheel from the step. By shortening the elevating wheels, it is possible to go down the step.
Since the step that can be raised and lowered depends on the allowable tilt of the front-back tilt, it is affected by the length of the dolly, but with a dolly that can be normally handled, it is possible to raise and lower a step of 100 to 300 mm. At a construction site, it is excellent in freedom of movement if it can move up and down a step of up to 200 mm.
The vertical movement of the lifting wheels is suitable. When it is raised and lowered in the vertical direction, the required raising and lowering length can be minimized and it is also excellent in durability.
When it is raised and lowered in an oblique direction, it cannot be raised and lowered at the center of the dolly, and it is difficult to maintain balance during the raising and lowering operation. Also, mechanically, the telescopic pipe method has a long telescopic length, which is troublesome to operate. In the method of rotating the arm as disclosed in Patent Document 4, since the human power to be driven by the lever is limited, the height is limited to be low and the practicality is inferior. Further, in the rotary arm method, the load applied to the rotary shaft is large, and the load required at a construction site or the like cannot be satisfied.
The transport trolley of the present invention can manually transport a weight of about 100 to 500 kg required at a construction site. Further, since the step from the parking lot to the entrance slope and the step between the EV floor and the corridor are 200 mm or less, it can be applied as a handy human-powered transport trolley even in the general transport field for delivery.
2. The elevator can use means such as a link or a screw-type telescopic pipe, and an operating end of the drive shaft is provided at the end of the bogie so that it can be operated at hand. A manual lever or a motor is used as the driving means. As the motor mechanism, a rotating device such as an impact wrench, which is often used at construction sites, can be used.

Schematic diagram of the transport trolley of the present invention The figure which shows the state which the transport trolley goes up a step The figure which shows the state which the transport trolley goes down a step Diagram showing an example of a step obstacle at a construction site Perspective view of the transport trolley of the first embodiment Perspective view of the back surface of the transport trolley of Example 1. The figure which shows the back surface of the transport trolley of Example 1. The figure which shows the rear surface of the transport trolley of Example 1. AA sectional view of the transport trolley of Example 1. The figure which shows the structure of the wheel of the transport trolley of Example 1. Perspective view of the transport trolley of the second embodiment The figure which shows the outline of the transport trolley (handle type) of Example 3. Perspective view of the back surface of the transport trolley of Example 3

The present invention is a hand-push type transport trolley that is provided with an elevating wheel at the center of the lower surface and can travel over obstacles such as steps on the floor surface of a construction site.
The push-type transport trolley of the present invention includes a loading platform, front / rear / left / right wheels provided on the lower surface of the loading platform, and an elevating wheel having an elevator. The lifting wheels are provided at least in the lower part of the loading platform and in the center, and are lifted and lowered by a jack-type elevator.

The elevator has a drive system having a drive shaft provided with an operating end at the end of the transport carriage, and is driven by a manual rotating means or a motor.
As the jack used for the elevator, a screw jack, a pantograph type jack, an X-link type jack, a mechanical jack such as a scissors jack, a hydraulic jack, or the like can be used. As a means for moving the elevating wheel up and down, a mechanism that moves in the vertical direction, which can minimize the required elevating length and has excellent durability, is suitable. With the means of moving in an oblique direction, it is not possible to move up and down at the center of the bogie, it is difficult to maintain the balance during the up and down operation, and with the telescopic pipe method, the telescopic length becomes long and it takes time and effort to operate. In the rotary arm method, the load applied to the rotary shaft is large, and the load required at a construction site or the like cannot be satisfied.

A screw jack that expands and contracts the shaft with a screw is suitable because it has a rotation input end on the base side, a rotation shaft can be connected to the input end, and the rotation shaft can be rotated from the end of the transport trolley. A gearbox may be provided in the middle to adjust the rotation speed to adjust the ascending / descending speed. A gear ratio of about 10: 1 to 40: 1 is used. Although it is related to the strength of the drive system, when the load is 100 to 500 kg and a popular commercial product is used, a gear ratio of about 20: 1 to 30: 1 is the relationship between durability and manual force. Suitable from.

Elevators use human power or motors as driving force to raise and lower the elevator.
In the case of human power, a ratchet lever as shown in Examples 2 and 11 can be used as a means for rotating the rotation shaft.
The motor mechanism may be a detachable external type or a fixed type. In the external method, rotating equipment such as an impact wrench, which is often used at construction sites, can be used. As for the impact wrench, the one that is usually used for work can be used, and it is excellent in versatility at the construction site and easy to charge and replace.

The basic configuration of the transport trolley of the present invention is shown in FIG.
The transport trolley 1 is provided with a handle 31 on the back side of the loading platform 2 and the loading platform 2. The handle 31 can be fixed or detachable. If it is removable, an insertion hole 37 is provided in the loading platform 2. The size of the insertion hole 37 depends on the thickness of the culm of the handle to be inserted, but the single pipe can be utilized by setting the diameter so that the single pipe used at the construction site can be inserted. Further, an insertion hole into which a support member or the like can be inserted is provided on the front side or the intermediate portion of the loading platform 2. By adjusting the diameter to match the single pipe, the versatility at the construction site is increased.
A wheel 4 including a front wheel 41 and a rear wheel 42 is provided below the loading platform 2. The front wheels 41 and the rear wheels 42 are provided on the left and right.
An elevator 6 is provided at the center of the lower portion of the loading platform 2, and an elevator wheel 5 is provided at the tip of the telescopic pipe 61 of the elevator 6. By expanding and contracting the expansion / contraction pipe 61, the elevating wheel 5 can be adjusted between the shortened height Hs and the extension height Hl with respect to the position H0 of the front wheel or the rear wheel. By extending the telescopic pipe, extending the elevating wheels, and lowering the rear wheels, it is possible to overcome the ascending step. The telescopic pipe can be shortened and the elevating wheel can be pulled up to overcome the downhill step.

The elevator 6 is provided with a handle joint 68 for rotating the bevel gear mechanism that drives the telescopic pipe 61. A drive shaft 64 connected to the handle joint 68 is provided along the lower surface of the loading platform 2 up to the rear end. The rear end side of the drive shaft 64 is the input end 67. The input end 67 is formed in a structure that can be connected to the drive source 7. A gearbox (increase / reducer) is provided in the middle of the drive shaft 64, and the rotation speed of the drive source 7 and the rotation speed of the handle joint 68 can be adjusted.
As the drive source 7, a manual force by a ratchet lever, a removable rotary drive body such as an impact wrench, a fixed motor, or the like can be used.

FIG. 2 shows an example of overcoming an ascending step using the push-type transport trolley of the present invention.
FIG. 2A shows a state in which the transport trolley has advanced to the front of the step. At this point, the worker extends the elevating wheels downward, lowers the rear wheels and lifts the front wheels (b), and the transport trolley in that state. To move the front wheel forward and place the front wheel on the upper part of the step (c). In the state (c) in which the front wheels are on the step, the elevating wheels extending downward are on the lower surface side of the step. The worker raises the elevating wheel and puts the elevating wheel on the upper surface of the step (d). In the states (c) and (d) where the transport trolley is inclined, the front wheels, the elevating wheels, and the rear wheels are in contact with the ground, so that the transport trolley is stable. The elevating wheel is extended to the same length as the front wheel, and the rear wheel is lifted (e). In the state (e), the load can be supported by the front wheels and the elevating wheels, and stability can be ensured. In this state, the transport trolley can be advanced and the rear wheels can be placed on the upper part of the step to overcome the ascending step (f).
Since the elevating wheels can be moved up and down in the vertical direction, the durability of the elevating wheel mounting structure is maintained without applying the scooping force associated with the elevating and lowering operations of the elevating wheels.
By loading the load so that the center of gravity is at the center of the transport trolley, the force required for tilting backward and lifting the rear wheels as shown in FIGS. 2 (b) and 2 (e) can be reduced. It is also useful to provide a mark on the upper surface of the loading platform to indicate the center of loading to call attention during loading work.
In addition, although FIG. 3A shows a state in which the front and rear wheels and the elevating wheel are in contact with each other, it does not indicate that the vehicle travels on a flat passage in this state, and the elevating wheel 5 is raised in the flat passage. It is enough to let the front wheels and the rear wheels run.

FIG. 3 shows an example of overcoming a downhill step using the push-type transport trolley of the present invention.
FIG. 3A shows a state in which the transport trolley has advanced to the front of the step, and the transport trolley is advanced as it is so that the front wheels are floated in the air (b). In this state, the transport trolley is supported by the rear wheels and the elevating wheels. In this state, the worker pulls up the elevating wheel upward and lowers the front wheel to touch the lower surface (c). The transport trolley is advanced with the front wheels touching the lower surface (c), the worker lowers the elevating wheels, the rear wheels are installed on the upper surface, and the elevating wheels and the front wheels are installed on the lower surface (d). The transport trolley is tilted forward (e). By shortening the elevating wheels to the same height as the front wheels, the rear wheels can be installed on the lower surface of the step to overcome the down step (f).
In the state of (b) and (e) on the descending step, the load is supported by the elevating wheel and the front wheel or the rear wheel, and in the inclined state of (c) and (d), the load is supported by the front and rear wheels and the elevating wheel. The stability of the dolly is maintained.

The transport trolley of the present invention can stably and easily get over a step even at a construction site where a relatively heavy object is transported. Further, since the step from the parking lot to the entrance slope and the step between the EV floor and the corridor are 200 mm or less, it can be applied as a transport trolley for delivery and as a handy human-powered transport trolley in the general transportation field.

Examples of the transport trolley of Example 1 are shown in FIGS. 5 to 10.
5 is a perspective view of the transport trolley 11, FIG. 6 is a bottom perspective view, FIG. 7 is a bottom view, FIG. 8 is a rear view, FIG. 9 is a sectional view taken along the line AA, and FIG. It is a figure.
In the transport trolley 11 shown in FIG. 5, a pipe-shaped handle 31 is attached to the rear portion of the loading platform 2, a tilt plate 25 is provided at the edge portion so as to be openable and closable, and a loading center mark 26 is provided in the middle of the upper surface. Is displayed, and an insertion hole 37 into which a support column can be inserted is provided in the front portion. There are six recesses on the upper surface of the loading platform, which contributes to weight reduction of the plate body formed by the loading platform and to the stability during transportation by accommodating the wheels when the transport trolley 11 itself is stacked and transported. A wheel 4 composed of a front wheel 41 and a rear wheel 42 and an elevating wheel 5 are attached to the lower portion of the loading platform 2.
The tilt plate 25 is provided with four tilt plates 25a, b, c, and d on the front, back, left, and right sides, each of which can be opened and closed, and serves as an enclosure for the load.
Since the transport trolley 11 is basically a worker holding the handle 31 and pushing it forward, the front and rear are indicated according to the traveling direction, and the handle side is referred to as the rear part.

On the back surface side of the transport trolley 11 shown in FIGS. 6 and 7, wheels 4 (front wheels 41, rear wheels 42) provided on the front, rear, left and right, an elevator wheel 5 attached via an elevator 6, and an elevator 6 A drive shaft 64 and a drive source 7 are provided.
The front wheels 41 and the rear wheels 42 constituting the wheels 4 have the bases of the pedestals 44 attached to the mounting plates 24 (24a, 24c) attached to the lower surface 2b of the loading platform, and the wheels are attached to the tips of the pedestals 44.
Side frames 23, 23 are hung between the front wheels 41 and the pedestals 44 of the rear wheels 42. Wheel frames 45, 45 are hung between the pedestals of the left and right front wheels and between the pedestals of the left and right rear wheels. The front, rear, left and right pedestals are connected by four frames, the side frames 23 and 23 and the wheel frames 45 and 45. An intermediate frame 32 is provided between the pedestals 44 and 44 of the left and right front wheels 41 and 41 and between the pedestals 44 and 44 of the left and right rear wheels 42 and 42, but it is strong as a wheel support structure. If it is not necessary, it is not necessary to provide it.
Since the transport trolley of the present invention needs to be provided with a mechanism for moving the elevating wheels 5 up and down, the leg length becomes long, so that the left and right front and rear legs are connected by a frame to reinforce them.
The elevator wheel 5 is a double wheel (51a, 51b), and the axle 52 of the double wheel is attached to the tip of the telescopic pipe 61 of the elevator 6.
The expansion / contraction length of the telescopic pipe 61 that moves the elevating wheel 5 up and down (= the elevating length of the elevating wheel) is set to a length that can clear the assumed height of the stepped portion, and the height of the side frame 23 is also the stepped portion. It is installed at a position where it will not rub even if the transport trolley is tilted.
Although the elevating wheel 5 has the same diameter as the wheel 4 in the illustrated example, it may have a small diameter or a large diameter.

The drive shaft 64 is provided from the elevator 6 to the rear portion, and is connected to the drive source 7. As the drive source 7, a removable rotary tool such as an impact wrench 71 can be used. An operation shaft support box 33 is provided at the rear end of the drive shaft 64, and a drive source 7 and the like are installed.
Mounting bases 34 having a length that can firmly support the base end of the handle 31 are provided at the four corners of the loading platform. The mounting base 34 at the front end is provided so that a support member or the like can be inserted.

FIG. 8 shows the rear surface of the transport trolley 11, and FIG. 9 shows a cross section of the central portion of the transport trolley 11 shown in FIG.
Handles 31 are attached to the left and right on the upper side of the loading platform 2, and a rear tilt 25b on the rear side is erected. A wheel frame 45 and an intermediate frame 32 are provided between the pedestals 44 and 44 of the left and right rear wheels 42 and 42.
An operation shaft support box 33 is provided at the center of the rear surface of the loading platform 2 to support the drive shaft 64 and the drive source 7. An elevator 6 is provided in the center of the lower part of the loading platform 2. The tip of the telescopic pipe 61 of the elevator 6 is connected to the axle 52 of the double wheels 51a and 51b constituting the elevator wheel 5.
In this example, a screw jack 62 is adopted as the elevator 6, a case 63 is attached to the lower surface of the loading platform, and a telescopic pipe 61 extends downward. The structure of the screw jack is a generally popular structure. A bevel gear structure exists in the case 63, and is a structure in which the rotation of the horizontally provided rotating drive shaft 64 is changed in the vertical direction to move the telescopic pipe up and down. A handle joint 68 for driving the bevel gear is provided on the case 63. A drive shaft 64 is provided along the lower surface of the loading platform 2 to the rear so as to connect to the handle joint 68. A gearbox 66 is provided in the middle of the drive shaft 64, and a transmission gear such as an impact wrench 71, which is a drive source, is provided to adjust the rotation speed of the rotary tool and transmit it to the handle joint 68. A gear ratio of about 10: 1 to 40: 1 is suitable. In the case of a screw jack that expands and contracts by about 2 mm per rotation of the handle, about 25: 1 to 30: 1 is suitable in consideration of workability and durability of the jack.
Further, below the mounting base 34 shown in FIG. 8, a tilt plate fixing metal fitting 29 for fixing the tilt plate is provided.

FIG. 10 shows the expansion / contraction state of the elevating wheels 5 of the transport trolley 11.
FIG. 10A shows a state in which the front wheel 41, the rear wheel 42, and the elevating wheel 5 are at the same level H0.
FIG. 10B shows a state in which the elevating wheel 5 reaches a shortened level Hs in which the telescopic pipe is shortened until the assumed step height can be overcome when descending or ascending.
FIG. 10C shows a state in which the elevating wheel 5 reaches an extension level Hl in which the expansion / contraction pipe is extended until the assumed step height can be overcome when descending or ascending.
Since the expansion and contraction operation of the elevating wheels when going up and down the step is the same as in FIGS. 2 and 3, the description thereof will be omitted.

FIG. 11 shows an example of the transport trolley 12 of the second embodiment.
A front wheel 41, a rear wheel 42, and an elevator wheel 5 are provided on the lower surface of the loading platform 2, and an elevator 6 for the elevator wheel 5 is provided. The basic configuration for overcoming the step is the same as that of the transport trolley 11 of the first embodiment.
In the transport trolley 12, a manual ratchet lever 73 is attached to the input end 67 of the drive shaft as a drive source for driving the elevator 6. A horizontal handle 35 is provided around the ratchet lever 73 to facilitate the lifting operation and maneuvering of the cover around the input end portion 67 and the rear portion of the transport trolley 12.
A footrest frame 36 is provided at the rear of the loading platform 2 so that the front wheel 41 can be easily lifted by putting a foot on the footrest frame 36 and putting a weight on the footrest frame 36 when climbing over a step.

Further, in this example, the elevating wheels 5 are separated by about the width of the loading platform 2, and the left and right elevating wheels 52a and 52b are provided. By providing the elevating wheels apart from each other to the left and right, the resistance to the elevating wheels tilting to the left and right and becoming unstable when overcoming a step is improved. On the other hand, since it is unstable to support only the telescopic pipe of the elevator 6 provided in the central portion, an elevating guide 54 is provided downward from the side of the loading platform so that the telescopic pipe can move smoothly in the vertical direction. ing. In this example, the elevating guide 54 is composed of a guide pipe 55 fixed to the side of the loading platform and an insertion hole 56 provided in the upper part of the left and right elevating wheels 52a and 52b, and is inserted as the elevating wheels move up and down. The hole 56 is vertically guided and moved according to the guide pipe 55.
An elevator frame 53 that connects the left and right elevator wheels 52a and 52b is provided, and the telescopic pipe 61 of the elevator 6 is connected to the central portion.

The pedestals 44 of the left and right rear wheels 42 are connected by a rear wheel connection 22, and the left and right front wheels 41 are connected by a front wheel connection 21. The pedestals 44 of the front wheels 41 and the rear wheels 42 are connected by a side frame 23 provided at the upper part.
In this example, since the elevating wheels 52a and 52b are provided separately to the left and right, it is difficult to provide the connecting members for the front and rear wheels below the pedestal 44, so they are provided at the upper part.
Further, the fact that a handle or a tilt can be provided on the upper part of the loading platform 2 is the same as that of the transport carriage 11 of the first embodiment, and thus is omitted.

Examples of the transport trolley 13 of the third embodiment are shown in FIGS. 12 and 13.
The transport trolley 13 has a wheel configuration and an elevating wheel configuration provided at the lower part of the loading platform 2, which are substantially the same as those of the transport trolley 12 shown in the second embodiment.
In the transport trolley 13, handle connections 38 are provided between the handles 31 erected on the left and right sides of the rear part of the loading platform 2. A drive unit gearbox 75 is attached to the input end of the drive shaft, a handle gearbox 76 is provided on the handle connection 38, and both gearboxes provided above and below the operation shaft 74 are connected to each other. A rotating operation handle 69 is attached to the handle gearbox 76. Gears for transmitting driving force are arranged in the drive unit gearbox 75 and the handle gearbox 76, and the rotational force is transmitted to the input end of the drive shaft via the operation shaft 74 by rotating the operation handle 69. Then, the telescopic pipe of the elevator 6 is expanded and contracted.

In this example, the gearbox 65 provided in the middle of the drive shaft 64 has a transmission gear configuration for increasing the number of revolutions. The operation handle 69 is manual, and the rotation speed is increased by the gear in the gearbox 65 in order to quickly expand and contract the elevator 6 of the bogie with respect to the manual rotation speed. However, since the handle diameter and the force that can be obtained manually are limited, the gear ratio cannot be increased. Therefore, the transport trolley 13 is suitable for a lightweight transport trolley having a load capacity of about 100 kg.
The description of the parts common to the transport trolley 11 shown in the first embodiment and the transport trolley 12 shown in the second embodiment will be omitted.

1, 11, 12, 13 Transport trolley 2 Loading platform 2b Loading platform bottom surface 21 Front wheel connection 22 Rear wheel connection 23 Side frame 24 (24a, 24b, 24c) Mounting plate 25 tilt plate 26 Loading center mark 29 tilt plate fixing hardware

31 Handle 32 Intermediate frame 33 Operation shaft support box 34 Mounting base 35 Horizontal handle 36 Footrest frame 37 Insertion hole 38 Handle connection

4 Wheels 41 Front wheels 42 Rear wheels 44 Legs 45 Wheel frames

5, 52a, 52b Lifting wheels 51a, 51b Double wheels 52 Axles 53 Lifting wheel frame 54 Lifting guide 55 Guide pipe 56 Insertion hole

6 Elevator 61 Telescopic pipe 62 Screw jack 63 Case 64 Drive shaft 65 Gearbox 66 Gearbox 67 Input end 68 Handle fitting 69 Operation handle

7 Drive source 71 Impact wrench 73 Ratchet lever 74 Operation shaft 75 Drive gearbox 76 Handle gearbox

Claims (5)

It ’s a push-type transport trolley.
It is equipped with a loading platform, wheels provided on the front, back, left and right, and an elevator wheel with an elevator.
The elevating wheel is provided at least in the lower part of the loading platform and in the center of the loading platform, and is a lifting wheel that expands and contracts in the vertical direction. Transport trolley. The carrier according to claim 1, wherein the wheels provided on the front, rear, left and right are at least the legs of the left and right wheels are connected by a wheel frame. The elevator has a drive system having a drive shaft, and an operation unit of the drive shaft is provided at the end of the transport carriage.
The transport carriage according to claim 1 or 2, wherein the drive source of the drive shaft is a manual rotating means, a motor, or a detachable rotating tool. The transport trolley according to any one of claims 1 to 3, wherein the jack is a screw jack that expands and contracts the shaft by a screw. The carrier according to any one of claims 1 to 4, wherein the drive system has a gearbox having a gear ratio of 10: 1 to 40: 1.

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