JPS6328054Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a hand-operated transport vehicle that can easily transport cargo, and particularly relates to an improvement of a transport vehicle that can move up and down stages.

Conventionally, the first transport vehicle that could go up and down stairs was
As shown in FIGS. 4 to 16, a main wheel is rotatably provided at a lower position of a vehicle body 1' having an L-shaped side surface, and a secondary wheel 3' is rotatably provided at an upper position thereof.
A device in which the distance between the axes of the main wheel 2' and the subwheel 3' can be freely adjusted is known, and this device is designed to move up and down stairs using the principle of leverage. That is, when climbing stairs, adjust the distance between the axes of the main wheel 2' and secondary wheel 3' according to the height and width of the step, and use the secondary wheel 3' as a fulcrum to push down and pull the handle 4' down. , raise the main wheel 2' one step, then use the main wheel 2' as a fulcrum to lift and pull the handle 4', and raise the sub wheel 3' one step. In this way, the main wheel 2' and the subwheel 3' are alternately used as fulcrums, and the main wheel 2' and the subwheel 3' are alternately raised one step at a time. On the other hand, when going down stairs, the main wheel 2' and the secondary wheel 3' are alternately used as fulcrums, and the main wheel 2' and the secondary wheel 3' are lowered one step at a time.

However, when there is a narrow landing 5' in the middle of the stairs, such as in a building in a housing complex, the carrier vehicle can be loaded onto the landing 5' from the stairs or lowered from the landing 5' onto the stairs using the principle of leverage. It was impossible. This is because, as shown in FIG. 16, the handle portion 4' comes into contact with the wall surface 6', making it impossible to pull the carrier. Therefore, conventionally the car body 1'
The robot was made to stand up, and then lifted up in this state and placed on the landing 5' or taken down from the landing 5'.

However, when a heavy load is loaded, it becomes extremely difficult to place the transport vehicle on the landing or to take it down from the landing, and more than one worker is required. In particular, these problems become noticeable when tall items such as refrigerators are transported using large transport vehicles.

The present invention was devised to solve the above-mentioned problems, and its purpose is to provide a transport vehicle that can smoothly and easily move the vehicle body up and down between stairs and landings even on narrow landings.

The feature of the present invention is that a main wheel is rotatably provided below the L-shaped side surface of the vehicle body, which is equipped with a handle and a loading platform, and a secondary wheel is rotatably provided above the main wheel. A control lever that can be folded into two, consisting of a lower lever and an upper lever, is provided on the vehicle body near the main wheels so that the bending point thereof is located outside the outer diameter of the main wheels, and the lever is foldable. An auxiliary wheel is rotatably provided at the bending point, a first lock mechanism is provided between the lower lever and the vehicle body to restrict the downward rotation of the lower lever, and a first lock mechanism is provided between the lower lever and the upper lever to prevent the lower lever from rotating downward. A second lock mechanism is provided to restrict the downward rotation of the lever.

With the above configuration, the present invention allows the vehicle body to move up and down between the stairs and the landing in a good and easy manner even on a narrow landing.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

1 and 2 show a transport vehicle showing an embodiment of the present invention, in which 1 is a vehicle body, 2 is a main wheel, 3 is a subwheel, and 4 is a transport vehicle showing an embodiment of the present invention.
is the operating lever.

The vehicle body 1 has an L-shaped side surface, and includes left and right side frames 6 connected by reinforcing members 5, a loading platform 7 provided at a lower position of the side frames 6, and a rotating upper position of the side frames 6. It is comprised of a frame-shaped handle 8 that is movably pivoted, a locking device 9 that fixes the handle 8 in a predetermined position, and the like. Incidentally, reference numeral 10 designates a second handle portion used when the handle portion 8 is rotated downward to lower the height of the vehicle body 1.

The main wheel 2 is rotatably provided below the vehicle body 1, and in this embodiment, a main shaft 12 is installed on a bracket 11 fixed to a position below the left and right side frames 6, and both ends of the main shaft 12 are mounted. The main wheel 2 is rotatably attached to the main wheel 2.

The secondary wheel 3 is rotatably provided above the vehicle body 1, and in this embodiment, the secondary wheel 3 is a support case 1 in which a secondary shaft 13 is mounted on a guide body 15 fixed to the vehicle body 1.
4 are slidably fitted, and the subwheel 3 is rotatably attached to the subshaft 13.

The distance between the axes of the main wheel 2 and the subwheel 3 can be adjusted by sliding the support case 14.
Note that the lock pin installed inside the support case 14 locks into the hole 1 of the guide body 15 due to the force of the spring.
6 and fixed in place. Furthermore, by operating the lever 17 and pulling out the lock pin from the hole 16 against the biasing force of the spring, the lock pin can be slid freely.

The main wheel 2 and the auxiliary wheel 3 are provided with a freely switching type reverse prevention device, and in this embodiment, a ratchet type reverse stop gear 18 or the like commonly used in bicycles is used. When the switching lever 19 is operated and the pin is locked to the anti-reverse gear 18, the main wheel 2 rotates only in the direction of pulling the handle 8, and when the pin is removed, the main wheel 2 can freely rotate forward and backward. Further, when the switching pedal 20 is operated and the pin is locked to the reverse stop gear 18, the secondary wheel 3 rotates only in the direction of pulling the handle 8, and when the pin is removed, it can freely rotate back and forth. These structures are conventionally known.

The operating lever 4 consists of a link-shaped lower lever 21 and a frame-shaped upper lever 22, and is pivoted on a support shaft 23 so that it can be folded into two. Further, the base end of the lower lever 21 of the operating lever 4 is installed on the vehicle body 1 near the main wheel 2, that is, the main shaft 12, so that the operating lever 4 can be tilted up and down, and the support shaft 23, that is, the bending point is located outside the outer diameter of the main wheel 2. It is set to be in the same position. In this embodiment, the upper lever 22 is configured to be extendable and retractable, and when not in use is shortened and placed in the retracted position (solid line position in Figure 1). Further, auxiliary wheels 24 are rotatably attached to both ends of the support shaft 23.

The lower lever 21 and the vehicle body 1, that is, the bracket 11
A first locking mechanism 25 is provided between the lower lever 21 and the lower lever 21 to restrict the downward rotation (clockwise in FIG. 3) of the lower lever 21. a first guide hole 26, a first lock rod 27 which is inserted through the first guide hole 26 and can come into contact with the bracket 11, and a tension spring 28 interposed between the first lock rod 27 and the base end of the lower lever 21. ,
A main abutment part 29 formed on the bracket 11 to prevent the lower lever 21 from rotating clockwise; and an intermediate abutment part 29 formed on the bracket 11 to prevent the lower lever 21 from rotating in the counterclockwise direction. 30 and
A cam surface 31 formed on the bracket 11 for pushing the first locking rod 27 upward in the first guide hole 26.
and the first locking rod 2 is formed on the bracket 11.
7 from the upper position of the first guide hole 26 to the lower position.

A second lock mechanism 33 is provided between the lower lever 21 and the upper lever 22 to restrict the downward rotation (clockwise in FIG. 3) of the upper lever 22. an L-shaped second guide hole 34, a second lock rod 35 that is inserted through the second guide hole 34 and can come into contact with the lower lever 21;
A tension spring 36 interposed between the second lock rod 35 and the support shaft 23, a main abutment 37 formed on the lower lever 21 and capable of preventing clockwise rotation of the upper lever 22, and a second main a cam surface 39 formed on the lower lever 21 to push the second lock rod 35 upward in the second guide hole 34; and a cam surface 39 formed on the lower lever 21 to push the second lock rod 35 upward in the second guide hole 34, and a second return part 40 formed on the lower lever 21 to be latched to the upper position of the lever 34.
The second return portion 41 returns the lock rod 35 from the upper position of the second guide hole 34 to the lower position.

Next, the effect of transportation will be explained.

When climbing stairs with luggage loaded, first adjust the distance between the axes of the main wheels 2 and secondary wheels 3 according to the height and width of the stairs, and activate the reverse rotation prevention device to prevent the main wheels 2 and secondary wheels from moving. Make wheel 3 non-reversible. Next, the main wheel 2 and the subwheel 3 are alternately used as fulcrums, and the main wheel 2 and the subwheel 3 are alternately raised one step at a time. Further, when going down stairs, only the secondary wheels 3 are made non-reversible, and then the main wheels 2 and secondary wheels 3 are alternately lowered one step at a time using the principle of leverage. Furthermore, since the reversal prevention device is activated when the transport vehicle goes up and down, the transport vehicle does not fall down and can safely go up and down the stairs.

On the other hand, when loading the carrier vehicle from the stairs onto the narrow landing 42, first tilt the vehicle body 1 toward you so that the center of gravity is located on the main shaft 12, and then use the operating lever 42.
is rotated around the support shaft 23 to ground the auxiliary wheels 24 on the landing 42 (see FIG. 6). At this time, the second lock rod 35 of the upper lever 22 is locked to the lower lever 2.
It abuts against the main abutment 29 of No. 1 and cannot be rotated clockwise.

Next, the upper lever 22 is extended, and the vehicle body 1
while holding the upper lever 22 with one hand and using the other hand.
is rotated a certain amount clockwise around the support shaft 23 to lift the vehicle body 1 slightly upward (7th
(see figure). Note that the upper lever 22 is connected to the first locking rod 2.
7 until it comes into contact with the intermediate abutment part 30 of the lower lever 21.

Then, while holding the vehicle body 1 with one hand, rotate the upper lever 22 from the solid line position in FIG. 7 to the chain line position to bring the second lock rod 35 into contact with the second main abutment portion 38.
The upper lever 22 is prevented from rotating clockwise.

Then, the upper lever 22 is rotated clockwise to lift the vehicle body 1 upward until the main wheels 2 are positioned above the landing surface 42 (see FIG. 8).
At this time, the first lock rod 27 slides on the cam surface 31 and is pushed upward in the first guide hole 26 and comes into contact with the main abutment part 29. Therefore, the car body 1 has a main axis 1
Rotation in the counterclockwise direction about 2 is prevented.

After lifting the vehicle body 1 to the position shown in FIG. 8, pull the operating lever 4 and place the vehicle body 1 on the landing 42 (see FIG. 10). At this time, since the auxiliary wheels 24 are attached to the support shaft 23, the vehicle body 1 can be easily pulled closer.

In this way, the vehicle body 1 can be lifted in a slightly tilted state using the operating lever 4.
The vehicle body 1 does not come into contact with the wall surface 43 of the landing 42. Also, the vehicle body 1 can be rotated using a part of the operating lever 4 as a fulcrum.
Because it lifts a heavy load, it can be easily lifted by one person. Furthermore,
Since the operating lever 4 is moved back and forth to lift the vehicle body 1, the stroke of the operating lever 4 can be short.

After placing the vehicle body 1 on the landing 42, press the operating lever 4.
Store it in the storage position. First, the upper lever 22 is rotated counterclockwise from the position shown in FIG. 8 to the solid line position shown in FIG. 9. At this time, the second locking rod 35 slides on the cam surface 39, is pushed upward in the second guide hole 34, and is latched at a position above the second guide hole 34 by the first return abutment 40. In this state, when the upper lever 22 is rotated from the solid line position to the chain line position in FIG. , the second locking rod 35 has a tension spring 36
The second guide hole 34 moves downward in the second guide hole 34 and comes into contact with the main abutment part 37 . Then lower lever 2
1 in the counterclockwise direction from the position shown in FIG. At this time, the first lock rod 27 is inserted into the first guide hole 2.
It is hung on the top of 6. When the lower lever 21 is rotated to the position shown in FIG.
comes into contact with the return abutment 32 and is unlatched from the first guide hole 26, and the first lock rod 27 moves downward within the first guide hole 26 by the biasing force of the tension spring 28. Therefore, the operating lever 4 is stored in the storage position.

When lowering the transport vehicle from the landing 42 to the stairs, the positional relationship between the upper lever 22 and the lower lever 21 is adjusted to the fifth position.
With the position shown in the figure and the positional relationship between the lower lever 21 and the bracket 11 as shown in FIG.
2 and push the vehicle body 1 forward in this state. At this time, the vehicle body 1 is in a state in which rotation toward the downstairs side is prevented by the first lock mechanism 25. Therefore, even if the user takes his hand off the vehicle body 1, the vehicle body 1 will not repeatedly pull downward, making it extremely safe.

Thereafter, the vehicle body 1 is gradually lowered by its own weight using the support shaft 23 as a fulcrum.

In the above embodiment, the vehicle body 1 is lifted by operating the operating lever 4 by hand, but the operating lever 4 may also be operated by the foot.
That is, when operating with the foot, the upper lever 22 is shortened, and in the state shown in Fig. 6, step on the upper lever 22 to rotate it clockwise to lift the vehicle body 1 to the position shown in Fig. 8, and then , just pull the vehicle body 1 closer. In this case, the stroke of the operating lever 4 becomes longer, but since the upper lever 22 is used in a shortened state, the operating lever 4 never comes into contact with the wall 43 of the landing 42.

Further, in the above embodiment, the stairs are moved up and down, but in other embodiments, the transport vehicle may be used to load cargo such as a refrigerator together with the transport vehicle onto the platform of a small truck. That is, as shown in FIGS. 11 to 13, the distance between the main wheels 2 and the subwheels 3 is adjusted to the height of the truck's loading platform, and the reverse rotation prevention device is activated to make the two wheels non-reversible. Bring the car to the state shown in FIG. Next, while holding down the handle part 8 using the secondary wheel 3 as a fulcrum, move the vehicle body 1 to the first
Lift it to the state shown in Figure 2. At this time, the training wheel 24
Since this contacts the truck loading platform door, the truck loading platform and the vehicle body 1 are in a non-contact state. Therefore, when lifting the vehicle body 1, there is no possibility that the vehicle body 1 and the truck bed will rub against each other and be damaged. Thereafter, the vehicle body 1 is further lifted using the secondary wheels 3 as a fulcrum to bring it into the state shown in FIG. 13, and in this state, the vehicle body 1 is pulled toward the front and loaded onto the loading platform. In addition, since a reverse rotation prevention device is activated on both wheels, the transport vehicle moves on the truck bed and does not fall.

On the other hand, if the transport vehicle is to be unloaded from the truck bed along with the cargo, the above-mentioned operation may be reversed.

As described above, according to the present invention, even a vehicle body loaded with heavy cargo can be extremely easily moved up and down from stairs to a landing or vice versa by a single worker. Furthermore, even if the landing area is narrow, the vehicle body can be operated smoothly and safely without coming into contact with the wall. Furthermore, when not in use, it can be stored on the vehicle body side, so it does not get in the way.

[Brief explanation of drawings]

Fig. 1 is a side view of a transport vehicle showing an embodiment of the present invention, Fig. 2 is a rear view thereof, Fig. 3 is an enlarged sectional view taken along the line - - in Fig. 4, and Fig. 4 is a rear view of the main part of Fig. 3. Figures 5 to 9 are explanatory diagrams of the operating state of the main parts;
Figure 10 is a schematic diagram when the transport vehicle is placed on the landing.
FIGS. 11 to 13 are schematic explanatory diagrams showing the case where cargo is loaded together with a transport vehicle onto the bed of a truck, and FIGS. 14 to 16 are schematic explanatory diagrams showing the operation procedure of a conventional transport vehicle. 1 is a vehicle body, 2 is a main wheel, 3 is a subwheel, 4 is an operating lever, 7 is a loading platform, 8 is a handle portion, 21 is a lower lever, 22 is an upper lever, 25 is a first lock mechanism,
33 is the second lock mechanism.

Claims (1)

[Scope of utility model registration request] In a transport vehicle, a main wheel 2 is rotatably provided at a lower position of a vehicle body 1 having an L-shaped side surface having a handle portion 8 and a load receiving platform 7, and a secondary wheel 3 is rotatably provided above the main wheel 2. , the operating lever 4, which can be folded into two, consisting of a lower lever 21 and an upper lever 22, is mounted on the vehicle body 1 near the main wheels 2 so that the bending point thereof is located outside the outer diameter of the main wheels 2. At the same time, an auxiliary wheel 24 is rotatably provided at the bending point, and a first lock mechanism 25 is provided between the lower lever 21 and the vehicle body 1 to restrict the downward rotation of the lower lever 21. Lever 21 and upper lever 2
2 is provided with a second lock mechanism 33 for restricting downward rotation of the upper lever 22.