JPH05170104A - Carrier ascending/descending stairway - Google Patents

Abstract

PURPOSE:To improve travel stability and operability by slidably providing a crawler wheel at a fixed interval from a load-carrying platform below it, and providing a gas spring between a support frame of the crawler wheel and the load carrying platform. CONSTITUTION:A handle 2 is provided at the front section of the load-carrying platform 1 of a carrier, and a crawler wheel 4 is provided below the rear end section of the load-carrying platform 1 so that a crawler frame 5 can be longitudinally slid by three pairs of front and rear rollers at a fixed interval. The crawler wheel 4 is rotated in the direction that the front end side 4a is separated from the load carrying platform 1 centering on a rear end rotary section 7 so that the inclination angle theta against the load-carrying platform 1 is changed within a fixed range, and a gas spring 8 is provided between the crawler frame 5 and the load-carrying platform 1. A tail wheel 17 is pivotally supported at the rear end section of the load-carrying platform 1, and a rotation support frame 21 pivotally supported with a conveying wheel 22 at the tip section is rotatably supported on a wheel support frame 19 provided on the load-carrying platform 1 in front of the tail wheel 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is suitable for vertically moving stairs, such as electric refrigerators, vending machines, chests of drawers, tatami mats, etc., which are relatively long or high in height. It relates to a stair lift carrier.

[0002]

2. Description of the Related Art Conventionally, as a stair lift carrier, as shown in FIG. 3, a crawler wheel C having a length extending over at least two steps of a stair B is provided below a loading platform A. It is known that the rear end of the load carrier A and the rear end thereof are substantially the same. Then, the stairs are moved up and down with various loads D loaded on the loading platform A.

[0003]

By the way, in the above stair climbing carrier, for example, an electric refrigerator, a vending machine, a chest of drawers, a tatami mat or the like having a relatively long length or a high height is mounted on the loading platform A. When carrying a highly transported object D and carrying it up and down stairs B, its center of gravity G passes through the front side of the crawler wheel C, and the handle E side at the front of the loading platform A receives a large downward load. In order to support this, there was a problem that a large amount of force was required for maneuvering. In addition, since the posture of the loading platform A is lowered along the stairs B and the apparent length of the carrier is long, the handle E side easily touches other things at the landing of the stairs B. There were also problems. Further, since the steering wheel E is operated in a low state, there is a problem that the operator is forced to have an unreasonable posture and is not only tired but also dangerous.
The present invention has been made for the purpose of solving the above-mentioned various problems.

[0004]

In order to achieve the above-mentioned object, the present invention provides a stair climbing carrier having a crawler wheel having a length extending over at least two steps of stairs on the lower side of a loading platform.
The crawler wheel is arranged on the lower side of the rear end side of the loading platform, and the crawler wheel is slidable with respect to the loading platform at a constant interval, and the front end side is rotated about the rear end rotating portion in the direction away from the loading platform. Tilt angle with the loading platform changes within a certain range,
A gas spring is inserted between the support frame of the crawler wheels and the loading platform, the inclination angle between the crawler wheels and the loading platform is set to about 10 degrees, and the rear end of the loading platform is more forward than the rear end of the crawler wheels when loaded. Are projected rearward at a predetermined interval, respectively.

[0005]

With the above structure, the present invention enables the crawler wheels arranged on the lower side of the rear end of the loading platform to be slidable with respect to the loading platform at a constant interval, and the front end side is separated from the loading platform about the rear end rotating portion. As it rotates, the inclination angle with the bed changes within a certain range, and a gas spring was inserted between the support frame of the crawler wheel and the bed, so the body center of gravity on the stairs moved to the rear side of the crawler wheel, The carrier travels stably. In addition, the apparent length of the loaded carrier is shortened, the rotating space at the landing is small, the operability is good, and the handle side does not come into contact with other objects. Further, the handle side is raised from the stairs, and the operator can operate in a comfortable posture, which reduces fatigue and is less dangerous. Since the inclination angle between the crawler wheels and the loading platform is set to about 10 degrees, and the rear end of the loading platform projects rearward at a predetermined interval from the rear end of the crawler wheels in the state of loading luggage,
The center of gravity of the vehicle on the stairs moves to the rear side of the crawler wheel, and the carrier travels steadily. In addition, the apparent length of the loaded carrier is shortened, the rotating space at the landing is small and the operability is good, and the carrier is switched between stair climbing transport and general road transport, and Easy switching to the stored state.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be specifically described below with reference to the accompanying drawings. 1 and 2, reference numeral 1
Is a carrier of a carrier, which has a handle 2 at the front.
Is provided so as to extend straight from the loading platform 1, and a relatively long or high-to-be-carried object 3 such as an electric refrigerator, a vending machine, a chest of drawers, a tatami mat, etc. is provided on the loading platform 1 and the handle 2. It can be loaded. The handle 2 is provided with a sub handle 2a on the lower side. A crawler wheel 4 is provided below the rear end of the loading platform 1 so that the crawler frame 5 can slide forward and backward at a constant interval by a total of four rollers, a pair of front and rear rollers.

The crawler wheel 4 rotates in a direction in which the front end side 4a separates from the luggage carrier 1 around the rear end rotating portion 7 (rotating shaft) while the left and right belt crawlers 6 and 6 are supported by the crawler frame 5. Move and tilt angle θ with the bed 1
Is changed within a fixed range (approximately 10 degrees in this embodiment). Further, a gas spring 8 having a gas reaction force lighter than the loads loaded on the luggage carrier 1 and the handle 2 is interposed between the crawler frame 5 and the luggage carrier 1.
The inclination angle between the crawler wheel 4 and the platform 1 is set to about 10 degrees because of the results of testing the stairs S, the transported object 3, the landing, etc. under various conditions. Also,
When the luggage is loaded on the luggage carrier 1 and the handlebar 2, the crawler wheel 4 contracts the gas spring 8 due to its weight, so that the rear end of the luggage carrier 1 is separated from the rear end of the crawler wheel 4 by a predetermined distance F (in this embodiment). Then, 100 mm) is used to project backward. The length of the belt crawlers 6 and 6 is slightly shorter than that of the three steps of the stairs S.

A motor 9, a speed reducer 10 and the like are provided at the rear end of the crawler frame 5 so as to drive the belt crawlers 6 and 6 to move up and down the stairs S. On the front side of the motor 9, a battery 11 serving as its power source is provided.
Is mounted, and an electrical component box 12 is provided on the front side of the battery 11, from which the handle 2 and the sub handle 2 are provided.
A cord is connected to an operation switch 13 provided between a and a, and the operation of the operation switch 13 causes the motor 9 to rotate in the forward and reverse directions to drive the belt crawlers 6 and 6 in the forward and reverse directions to move forward on the stairs S. It is designed to move backward (elevate). A fork 14 is provided at the rear end of the luggage carrier 1.

Further, the crawler wheel 4 has a rotation support member 15 between the front upper side of the crawler frame 5 and the loading platform 1.
And a state in which the front end side 4a is rotated about the rear end rotating portion 7 (rotating shaft) in a direction away from the luggage carrier 1 as described above,
The front end side 4a is displaceably supported in a state in which the front end side 4a approaches the luggage carrier 1 and is rotated so as to be parallel to the luggage carrier 1, and the crawler wheel 4 is locked at a position parallel to the luggage carrier 1 and unlocked. A lever 16 is provided. When the lock lever 16 unlocks the crawler wheel 4, the crawler wheel 4 rotates about the rear end rotating portion 7 (rotating shaft) in a direction in which the front end side 4a moves away from the luggage carrier 1 and the inclination angle θ with respect to the luggage carrier 1 is increased. Hold at (approximately 10 degrees). From this state, when the crawler wheels 4 are made parallel to the loading platform 1,
Alternatively, when any one of the loading platforms 1 is rotated, it is automatically locked by the lock lever 16.

A brake lever (not shown) is provided on the handle 2 so that a brake device provided at a rear end portion of the crawler wheel 4 is operated to apply a brake. Also, the tail wheel 1
7 are supported and arranged by the tail wheel support frame 18. Further, on the loading platform 1 on the front side of the tail wheel 17, the transport wheels 22 are mounted on a rotation support frame 21 which is rotatably supported by a wheel support frame 19 around a support shaft 20 between an extended position and a storage position. It is pivotally supported.

As shown in FIG. 2, the stair climbing carrier having such a structure has a relatively long length such as an electric refrigerator, a vending machine, a chest of drawers, a tatami mat, etc. on the loading platform 1 and the handle 2. , Or a high object 3 to be transported and stairs S
When moving up and down, the crawler wheel 4 is unlocked in advance by the lock lever 16, and the crawler wheel 4 is rotated in the direction in which the front end side 4a separates from the loading platform 1 about the rear end rotating portion 7 (rotating shaft). It moves and tilts with respect to the bed 1 at a tilt angle of about 10 degrees. Loaded object 1 on handle 1 and handle 2
When loading, the use of the fork 14 facilitates the loading work. When an object to be transported 3 such as an electric refrigerator, a vending machine, a chest of drawers, a tatami mat, etc. is loaded on the loading platform 1 and the handle 2, the weight of the gas spring 8 causes the crawler wheels 4 to slide forward. The rear end of the loading platform 1 projects rearward by about 100 mm from the rear end of the crawler wheel 4.

Then, the belt crawlers 6 and 6 of the crawler wheels 4 are placed on the stairs S, and the operator holds the handle 2 or the sub handle 2a and operates the operation switch 13 to drive the belt crawlers 6 and 6 to carry them. The car moves up and down the stairs S. At this time, when the carrier is going up and down the stairs S, the operator holds the handle 2 or the sub handle 2a on the upper side of the stairs S, when the carrier is going up, the belt crawlers 6 and 6 are normally rotated, and when the carrier is going down, they are reversed. .. When the stairs S are moved up and down, the inclination angle of the loading platform 1 is steeper than the inclination angle of the stairs S, so that the center of gravity G of the transported object 3 passes slightly behind the half position of the crawler wheels 4 in the longitudinal direction. Therefore, as in the conventional example of FIG. 3, the center of gravity G of the transported object D passes through the front side of the crawler wheel C, and the handle 2 side at the front part of the loading platform 1 receives a large downward load (arrow) and It does not require a great deal of force to operate because it is supported, and can perform well-balanced and easy transportation work.

Further, since the handle 2 and the sub handle 2a are located at a position obliquely higher than the stairs S, the operator can operate the handle 2 or the sub handle 2a without bending his or her waist significantly, which reduces fatigue. You can do less work and less risk. Furthermore, when the carrier climbs from the landing to the stairs S, or from the stairs S to the landing,
When the turning operation is performed, since the rear end of the loading platform 1 is projected 100 mm rearward from the rear end of the crawler wheel 4, the protruding length of the handle 2 with respect to the crawler wheel 4 is shorter than that of the conventional one, and the turning operation is easy. Can travel and prevent contact with other things.

When carrying out the turning motion at the landing when the stairs S of the transport vehicle are raised and lowered as described above, when the vehicle body is stood, the tail wheel 17 comes into contact with the ground and can easily turn. further,
When using for carrying work on a flat ground without moving up and down the stairs of the carrier, fix the crawler wheels 4 in parallel with the loading platform in the order opposite to the above-mentioned operation when projecting, and use the carrier wheels 22. It can be extended to the state and can be carried manually without using the crawler wheels 4. Further, if the crawler wheels 4 and the transport wheels 22 are not used and are stored, the storage area can be reduced.

[0015]

As described above, according to the stair climbing carrier of the present invention, the following effects can be obtained. The crawler wheels 4 arranged on the lower side of the rear end side of the luggage carrier 1 are made slidable with respect to the luggage carrier 1 at regular intervals, and the rear end rotating portion 7 is provided.
The front end side 4a rotates in a direction away from the luggage carrier 1 around the center of the vehicle and the inclination angle θ with respect to the luggage carrier 1 changes within a certain range, and the gas spring 8 is provided between the support frame 5 of the crawler wheel 4 and the luggage carrier 1.
Since the vehicle is inserted, the vehicle body center of gravity G on the stairs S moves toward the rear side of the crawler wheels 4, and the transport vehicle can be stably driven. Further, the apparent length of the carrier carrying the luggage 3 is shortened, the rotating space at the landing is small, the operability is good, and the handle 2 side can turn without contacting other objects. Further, the handle 2 side is raised from the stairs, and the operator can operate in a comfortable posture, which reduces fatigue and reduces danger. The inclination angle θ between the crawler wheel 4 and the loading platform 1 is about 10
Since the rear end of the loading platform 1 protrudes rearward from the rear end of the crawler wheel 4 at a predetermined interval (approximately 100 mm) in the loaded state, the vehicle center of gravity G on the stairs S is You can move the vehicle to the rear side and drive the transport vehicle with stability. In addition, the apparent length of the carrier loaded with luggage 3 is short, the rotation space at the landing is small, and the operability is good, and the carrier is switched between stair climbing transport and general road transport, and , It is possible to easily switch to the stored state.

[Brief description of drawings]

FIG. 1 is a perspective view of an entire transportation vehicle to which the present invention is applied.

FIG. 2 is a schematic configuration and operation explanatory view of the present invention.

FIG. 3 is a diagram illustrating the operation of a conventional carrier.

[Explanation of symbols]

 1 Loading platform 2 Handle 2a Sub handle 3 Object to be transported 4 Crawler wheel 4a Crawler wheel front end side 5 Crawler frame 6 Belt crawler 7 Belt crawler rear end rotating part 8 Gas spring 9 Motor 10 Reducer 11 Battery 12 Electrical equipment box 13 Operation Switch 14 Fork 15 Rotation support member 16 Lock lever 17 Tail wheel 18 Tail wheel support frame 19 Wheel support frame 20 Spindle 21 Rotation support frame 22 Carrying wheel θ Crawler wheel inclination angle with the loading platform F Crawler wheel rear end Distance from the rear end of the loading platform S Stairs G Center of gravity

Claims (2)

[Claims] 1. A stair climbing carrier having crawler wheels having a length extending over at least two steps of stairs on the lower side of the loading platform, wherein the crawler wheels are disposed on the lower side of the rear end of the loading platform. , The crawler wheel is slidable with respect to the loading platform at a constant interval, and the front end side of the crawler wheel rotates in a direction away from the loading platform around the rear end rotating portion to change the inclination angle with the loading platform within a certain range.
A stair climbing carrier, wherein a gas spring is inserted between the support frame of the crawler wheels and the loading platform. 2. The inclination angle between the crawler wheel and the loading platform is set to about 10 degrees, and the rear end of the loading platform projects rearward at a predetermined interval from the rear end of the crawler wheel when loaded. The stair lift carrier according to claim 1.