JP2001138920A - Carriage with lift platform - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a carriage with a lift platform that has a mast for vertical motion of the platform and can ensure an appreciable longitudinal balance and front visibility. SOLUTION: This carriage with a lift platform is so constructed that an engine E is installed in the rear of a travel frame 1 with front and rear wheels 1a and 1b on each of the right and left sides, that a mast 2 is raised in the front of the frame 1 to support a platform 2a for vertical motion thereof, and that the platform 2a is vertically moved via a lift mechanism 3 installed on the frame. The mast 2 is a single post member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a carrier with a lifting platform in which a mast is erected at a front portion of a traveling body and a loading platform is provided along the mast so that the platform can be raised and lowered.

[0002]

2. Description of the Related Art Conventionally, a small carrier having a carrier at the front of a traveling body having front wheels and rear wheels has a configuration in which the carrier is supported by a plurality of masts (supports) provided on the left and right sides of the body. Things have been suggested.

[0003]

However, in the conventional vehicle having the above-described structure, a plurality of masts for supporting a carrier at the front of the body are required to move forward while walking from behind the body. There are drawbacks such as obstructing the field of view, hindering transportation and traveling, and making it difficult to visually recognize the state of the mounted object when the carrier is moved up and down along the mast.

[0004] In addition, a loading section, in which a plurality of masts are erected at the front of the body, and which lifts and lowers the loading section using a hydraulic cylinder, has a complicated structure and a large weight. The weight balance is deteriorated, making it difficult to stably carry the vehicle, and increasing the cost.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has an engine E at the rear of a traveling body 1 having a front wheel 1a and a rear wheel 1b on the left and right.
Is mounted, and a mast 2 for supporting the loading platform 2a so as to be able to move up and down is erected at the front of the body 1, and the loading platform 2a is moved up and down via a lifting mechanism 3 such as a wire winding system installed on the body side. It is characterized in that it is configured to operate.

[0006] Further, the mast 2 is characterized in that it is constituted by a single support member.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

A is a transport vehicle according to the present invention. The transport vehicle A has a machine base 11 integrally extending behind a transmission case (transmission frame) 10 having left and right front wheels 1a and rear wheels 1b. And a traveling body 1 having an engine E mounted on the machine base 11, a mast 2 erected on the front side of the transmission case 10, and a carrier section 4 including a carrier 2a and the like can be slid up and down on the mast 2. , And lifts and lowers the loading platform 4 via a wire 3a extended from a wire winding type lifting mechanism 3 installed on the traveling machine body 1 side.

The detailed configuration of each unit will be described below.

First, the traveling body 1 has a transmission case 10 in which various speed-change and transmission mechanisms are built, and has a substantially rectangular shape in a side view, and a front wheel 1a and a rear wheel 1
b, and supports the axles 1c and 1d, and the machine base 11 is provided on the rear side, and the handle 12 is extended rearward on the upper part of the machine base 11, and the lifting mechanism is provided on the upper side inclined forward. The lifting mechanism 3 is installed by a configuration to be described later, and is configured to be capable of switching drive operation from the transmission case 10 side via a lifting operation lever 3L. 1L is an operation lever for switching the forward / reverse transmission mechanism in the transmission case 10.

As shown in FIGS. 1 and 4, the transmission case 10 is formed in an elliptical shape in a side view, and a drive shaft 13 supported on the upper portion thereof is driven by an engine E via a belt clutch mechanism 13a. The power is input so as to be able to be turned on and off, and an input shaft 30 pivotally supported on the top of the transmission case 10 from the drive shaft 13 is driven by chain transmission. A forward / reverse rotation shaft 37 pivotally supported in the forward / rearward direction via a forward / reverse rotation switching mechanism 30a is provided so as to be capable of switching between forward and reverse rotation by operating the lifting operation lever 3L.

As shown in FIG. 4, the lifting mechanism 3 has a winding drum shaft 32 and a worm wheel shaft 3 in a box-shaped lifting mechanism case 31 formed on a transmission case 10.
3 is vertically supported, the take-up drum shaft 32 and the worm wheel shaft 33 are operatively connected by a chain transmission mechanism 35, and a worm gear 36 meshed with the worm wheel shaft 33.
Is supported in the front-rear direction.
Through the rotation shaft 37. The winding drum shaft 32 is provided with a winding drum 38 to which the end of the wire 3a is fixed, in an exposed state.

The device for driving the winding drum 38 can easily be a wire winding type, but it is also possible to use a chain driving type or a combination of a cylinder device and a wire. Yes, various driving devices can be used in the present invention.

Next, the configuration of the loading platform 4 will be described.

The carrier 4 is provided with a mast 2 described in detail in FIG.
Is supported by a mounting bracket 16 projecting upward from the front of the transmission case 10 of FIG. 1 and is slightly inclined rearward at the front center of the body 1. In the mast 2, a hollow guide portion 20 for vertically guiding the loading platform 2a is formed, and the loading platform 2a is installed facing forward through a slide portion 21 inserted into the guide portion 20. It has a configuration.

As shown in FIGS. 1 and 2, the loading platform 2a is formed by bending the base of the bifurcated loading claw 22 integrally with an inverted U-shaped backing rod 23 to form an inverted L-shape in side view. The back of the back support rod 23 is fixed to the slide portion 21.

As shown in FIG. 1, the loading platform 2a has a back support rod 23 formed so as to be substantially parallel to the rearward inclination of the mast 2 in a side view, so that the mounted object S moves rearward as it goes upward. They can be loaded together. Therefore, with this configuration, the object S is brought close to the position of the center of gravity of the machine body side, and the machine body 1 does not fall forward, and the object S is stably loaded without being shifted forward by the back receiving rod 23. It is configured so that it can be loaded and traveled well.

The other end of the wire 3a wound around the take-up drum 38 is attached to the upper portion of the slide portion 21, and a halfway portion of the wire 3a is attached to the upper portion of the mast 2 and the guide roller 25 provided on the mounting bracket 16, 26 and is connected so as to be wound around the winding drum 38 side.

As shown in FIG. 3 (a), the mast 2 uses a single square pipe having a substantially square hollow cross section, and a plate-like slide portion 21 is fitted into the center of the front surface thereof. The slide groove 27 to be moved up and down is opened.
The slide portion 21 is slidably fitted to the slide 7.

A roller shaft 28 is loosely fitted in the mast 2 above and below the slide portion 21, and guide rollers 29 are attached to both sides of the roller shaft 28 so as to rotate freely. By being inserted into the part 20, it is possible to smoothly move up and down in the vertical direction without shaking or rattling.

The structure of the guide roller with respect to the slide portion 21 may be configured as shown in FIGS. 2B and 2C. In FIG. 2B, the bearing is fitted on both sides of the roller shaft 28. Shows what formed the guide roller,
FIG. 4C shows an example in which the roller shaft 28 is bolted, the bolt 28 is inserted into the slide portion 21 and the guide rollers 29 on both sides, and the bolt is fastened with a nut.

The transport vehicle A configured as described above has a loading posture in which the loading platform 2a shown by the solid line in FIG.
The objects S are stacked at a predetermined number or a predetermined height.
When the raising / lowering operation lever 3L is operated to the ascending side, the power of the engine E rotates forward and reverse through the drive shaft 13, the input shaft 30, and the forward / reverse rotation switching mechanism 30a. The worm wheel shaft 33 and the take-up drum shaft 32 rotate forward to rotate the take-up drum 38 in the take-up direction.

By this operation, the guide rollers 26 and 2
The wire 3a guided by the wire 5 is wound on a winding drum 38, and the slide portion 21 is guided by a guide roller 29 in the mast 2.
Can be lifted up while being guided by rolling, and the loading platform 2a
Can be raised to a predetermined height away from the ground.

At this time, when the raising / lowering operation lever 3L is turned off (neutral operation), the rotation of the winding drum 38 is stopped via the forward / reverse rotation switching mechanism 30a, and the lifting / lowering mechanism 3 is connected to the worm screw 36 and the worm wheel 33. Has a worm-meshed winding and unwinding structure of the wire 3a, so that even if the wire 3a is pulled by the load of the carrier 2a, the wire 3a is reliably prevented from reversing. Can be done.

Then, by operating the operation lever 1L, the body 1
When the vehicle travels, the mast 2 erected from the mounting bracket 16 at the center of the fuselage 1 and the carrier 2a supported by the mast 2 via the slide portion 21 apply the center of gravity of the carrier 2a to the body 1 side. It is in a state of being left.

In the state where the weight of the engine E disposed at the rear of the transmission case 10 and the weight before and after the loading platform 2a are well balanced, an intermediate portion between the front wheel 1a and the rear wheel 1b supporting the transmission case 10 is provided. The position of the center of gravity is set at the position, and as a result, the transport vehicle A can stably transport and travel.

Next, in the loading / unloading operation for loading / unloading the object S placed on the loading platform 2a at a high position such as the loading platform or shelf of the truck, the loading platform 2a is further raised as shown by the dotted line in FIG. It can be done by.

When the lifting operation lever 3L is moved downward, the worm screw 36 rotates in the reverse direction via the forward / reverse switching mechanism 30a, so that the winding drum 38 rotates in the feeding direction. Accordingly, the support of the suspended state of the carrier 2a is released, and the lowering due to its own weight and the weight of the object S can be promptly performed.

As described above, the carrier A provided with the loading section 4 configured so that the loading section 2a can be moved up and down by one mast 2 located at the center in the width direction of the body 1 is a conventional type using the mast 2. There is no obstruction to the front view unlike the device.

Therefore, the driver can travel with ease while widening the field of view while traveling from the rear of the airframe 1 while following the airframe 1, and at the same time, the state of loading of the object S on the loading platform 2a, Further, the state of lifting and lowering of the loading platform 2a can be confirmed, the collapse of the load can be prevented, and the loading and unloading operations can be performed efficiently.

Further, one mast 2 also serves as a guide rail for slidingly guiding the slide portion 21 in the hollow square pipe, so that the loading platform 2a can be lifted and lowered accurately without shaking or rattling. it can. Further, there are various advantages such as a simple and inexpensive configuration, a reduction in the weight of the carrier 4 and an improvement in the balance of the machine.

As shown in the drawing, the elevating mechanism 3 employs a configuration in which the wire 3a is wound and fed out and installed on the upper oblique side of the transmission case 10 formed in a letter shape in side view. Weight of front wheel 1a and rear wheel 1
b, the body 1 is compactly packed, the stability of the center of gravity is improved, and no load is applied to the loading platform 4 side, so that the driving operability is good.

Although not shown, when the mast 2 is formed so that it can be bent rearward in the direction of the handle 12 from the middle part to the upper part, when the object S is raised along the mast 2 In addition, the weight acts on an intermediate position between the front wheel 1a and the rear wheel 1b, so that the transporting performance can be further improved.

That is, the mast 2 is attached to the mast 2 as shown in FIG. 1 and FIG.
At a position above the rearwardly inclined path slightly bent backward.

Therefore, by using the mast 2 having the upper portion inclined so as to retreat, a retreat inclined path (not shown) is raised from the loading position indicated by the solid line in FIG. Since the load of the loading platform 2a moves sequentially to the machine body center, the traveling with the loading platform 2a raised can be performed stably, and the accompanying unloading work can be performed stably and efficiently. That can be done.

Further, the mast 2 having a swept angle as described above or formed to be bendable so as to have a swept angle.
Has the advantage that the loading platform 2a can be placed at a low position while the amount of rotation of the mast 2 is reduced as much as possible even when the rotation is switched to the tilting posture about the support shaft of the bent portion. .

[0037]

As is apparent from the above description, the following effects can be achieved by the carrier with a lifting platform according to the present invention.

An engine E is mounted on the rear part of the traveling body 1 having left and right front wheels 1a and rear wheels 1b, and a mast 2 for supporting the loading platform 2a so as to be able to move up and down is provided upright on the front part of the body 1. Since the loading platform 2a is moved up and down via an arbitrary lifting mechanism 3 installed on the machine body side, the mast 2 having the loading platform 2a lifted by the lifting mechanism 3 and the engine E are connected to the front wheel 1a and the rear wheel 1a. Since it is possible to support the vehicle 1 in a well-balanced manner before and after the wheel 1b, it is possible to stably carry and carry the object S.

Further, the carrier 2a is lifted and lowered by a single mast 2 at the front of the traveling machine body 1, so that the forward traveling can be improved and the transporting and loading can be performed.
It is possible to provide the transportable vehicle A that can appropriately raise and lower a and can be manufactured easily and at low cost and that is easy to handle.

[Brief description of the drawings]

FIG. 1 is a side view of a transport vehicle.

FIG. 2 is a plan view of FIG.

3A is a plan sectional view of the mast of FIG. 1, FIG. 3B is a sectional view of another embodiment of the mast, and FIG. 3C is a sectional view of another embodiment of the mast.

4A is a side view showing a transmission case and an elevating mechanism, and FIG. 4B is a plan view of FIG.

[Explanation of symbols]

A Truck 1 Running body 1a Front wheel 1b
Rear wheel 2 mast 3 lifting mechanism 3a wire 4
Cargo part E Engine S Placement

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3D050 AA01 BB06 BB22 DD01 EE15 HH06 KK13 3F333 AA03 AB15 AE02 BA02 BD05 CA12 DA02 DB01 DB02

Claims (2)

[Claims] An engine E is mounted on a rear portion of a traveling body 1 having left and right front wheels 1a and rear wheels 1b, and a mast 2 is provided at a front portion of the body 1 to support a loading platform 2a so as to be able to move up and down. And a carrier with a lifting platform configured to move the loading platform 2a up and down via a lifting mechanism 3 installed on the body side. 2. The transport vehicle with a lifting platform according to claim 1, wherein the mast 2 is constituted by a single support member.