JP2001328540A - Deck structure of truck - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a deck structure of a truck, capable of protecting a front wheel 1a serving as a bumper at the lower part of a supporting frame 7 for lifting and lowering a deck 2a. SOLUTION: The deck structure of a truck comprises a mast 2 having the deck 2a liftable and lowerable, provided at the front part of a travel machine 1 having a front wheel 1a and a rear wheel 1b, and a supporting frame 7 provided along the mast 2 for supporting a material S placed on the deck 2a at both sides. The lower part of the supporting frame 7 is located at the front part of the front wheel 1a to serve a bumper member.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carrier structure of a carrier having a support frame for supporting a load S on a mast having a carrier capable of moving up and down at the front of a traveling machine body.

[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 are already known.

[0003]

The carrier having a plurality of masts as described above has the disadvantage that the structure of the front carrier is complicated, the cost is high, and the vehicle is heavy.

[0004] In view of this problem, the present inventor studied a transport vehicle in which one mast was erected at the front of the traveling machine body and a lightweight carrier was provided on the mast so as to be able to move up and down. It has been confirmed that when a wide object is placed on a loading bed of such a type or when the loading is performed at a high load, there is a problem that the cargo is likely to be lost at the time of lifting / lowering of the loading bed or traveling.

[0005] Further, since this type of device has a structure in which the vicinity of the front wheel is narrow, there is no means provided for preventing accidents in which the front wheel is entangled. There were problems such as needing attention.

[0006]

SUMMARY OF THE INVENTION The present invention provides a carrier bed structure for solving the above-mentioned conventional problems, and includes a carrier 2a at the front of a traveling body 1 having front wheels 1a and rear wheels 1b. A mast 2 is provided so as to be able to ascend and descend, and a support frame 7 for supporting a load S placed on a carrier 2a from both sides is provided on the mast 2, and a lower portion of the support frame 7 is a front portion of the front wheel 1a. , And also serves as a bumper member.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a carrier with a carrier according to the present invention will be described below with reference to the drawings.

Reference numeral A denotes a transport vehicle according to the present invention. The transport vehicle A has a transmission case (transmission frame) 10 having left and right front wheels 1a and rear wheels 1b at the front and rear, and is integrally formed behind the transmission case 10. A traveling body 1 on which an engine E is mounted on a machine base 11 which is extended
One mast 2 erected in front of the
And a loading platform 2a and the like, which is supported so as to be able to slide up and down and is raised and lowered via a wire 3a extended from a wire winding type lifting mechanism 3 installed on the traveling machine body 1 side.
It consists of:

The detailed configuration of each unit will be described below.

First, as shown in FIG. 1, a traveling body 1 has a transmission case 10 in which various speed-change and transmission mechanisms are housed, and is formed in a substantially U-shape in a side view, and a front wheel 1a and a rear wheel 1 Axles 1c and 1d are provided for supporting the vehicle 1b, respectively, and the machine stand 11 is connected to the rear side of the vehicle. A large handle 12 is provided on the upper side of the machine body 11 to extend rearward. The lifting mechanism 3 is shown in FIG.
The lifting mechanism 3 is installed so as to be described later, and is configured to be able to perform a switching drive operation from the transmission case 10 side via a lifting operation lever 3L. The operation lever 1L performs a switching operation of the forward / reverse transmission mechanism in the transmission case 10.

As shown in FIG. 1, the transmission case 10 is a box-shaped elevating mechanism case 31 installed on an upper part of a letter shape.
The take-up drum shaft 32 and the worm wheel shaft 36 are vertically supported in the inside thereof, and both are power-coupled by a chain transmission mechanism 35. The winding drum shaft 32 is provided with a winding drum 38 to which an end of the wire 3a is fixed, which is provided in an exposed state.

Next, the loading platform 4 will be described.

As shown in FIGS. 5 and 10, the loading section 4 is configured such that the lower part of the mast 2 is connected to the transmission case 1.
Mounting bracket 16 protruding from the left and right above the front of 0
In the center of the front part of the fuselage 1, it is erected slightly backward. In the mast 2, a hollow guide portion 20 for vertically guiding the loading platform 2a is formed in a vertical direction,
The loading platform 2a, which is engaged and supported by the slide unit 21 inserted into the guide unit 20, is installed so as to be movable up and down toward the front.

That is, as shown in FIGS. 1, 7 to 9, the base 2a of the bifurcated load claw 22 is attached to the base 2a of the inverted U-shaped back support rod 2 as shown in FIGS.
3 and is integrally bent in a reverse U-shape in side view, and the back of the back receiving rod 23 is fixed to the slide portion 21.

At this time, the loading platform 2a is provided with the back support rod 23 substantially parallel to the rear inclination of the mast 2 in a side view, so that the load S can be moved rearward toward the upper side to be loaded. This allows the object S to be stably loaded without approaching the position of the center of gravity on the fuselage side and causing the object S to fall forward, and without the object S being loaded forward by the back support rod 23, It is designed so that traveling and transportation can be performed well.

The wire 3a is connected to the slide 21
The other end of the wire wound around the winding drum shaft 32 is fixed to the upper part of the winding drum, and the wire 3a is wrapped around the upper part of the mast 2 and the guide rollers 25 and 26 provided on the mounting bracket 16 so as to be wound around the winding drum. It is connected so as to be wound around the shaft 32 side.

In such a configuration, the back receiving rod 23 (FIG. 9) formed in a downward U-shape has a halfway part formed by a horizontal rod 23a.
The horizontal rod 23a and the center of the upper part are connected by two vertical rods 2.
At 3b, a rigid frame is formed by connecting a gap (slit) in which the slide portion 21 can be fitted.

An attachment pin 23c is provided in the middle of the two vertical rods 23b so as to connect the two, and the attachment pin 23c is recessed and formed above the slide portion 21 (FIG. 7). ), The horizontal rod 23a is brought into contact with the front surface of the slide portion 21 in a state of being fitted from above. With this configuration, the loading platform 2a has an advantage that it can be stably supported on the mast 2 via the slide portion 21, and that the loading platform 2a can be easily attached to and detached from the slide portion 21.

The mast 2 uses a square pipe having a substantially square hollow cross section as shown in FIGS. 8 and 10, and a slide groove for vertically moving by inserting a plate-like slide portion 21 into the center of the front side surface. The slide portion 21 is slidably fitted in the slide groove 27.

In the mast 2, a roller shaft 28 is penetrated and fixed above and below the slide portion 21.
8B, a pair of guide rollers 29 is provided on both sides of FIG.
As shown in FIG.
1 is inserted into the guide portion 20 of the internal cavity of the mast 2 so that the up and down movement can be performed smoothly without swinging or rattling.

The mast 2 includes a fall prevention mechanism 5 which will be described later with reference to FIG. 10, and a support frame 7 (FIG. 1) for receiving the object S placed on the carrier 4 and the like. 6 is stably supported on the traveling machine body 1 via a transmission case 10 by a posture switching mechanism 9 having a switching operation tool 8 shown in FIG. 6, and the mast 2 can be easily converted into a “standing posture” and a “tilting posture”. It is possible to switch.

First, the "posture switching mechanism 9" will be described with reference to FIGS.

The mounting bracket 16 is bifurcated so as to protrude upward from the left and right sides of the axle 1c so as to sandwich the transmission case 10 from above and below. A support shaft 9 that supports the guide roller 26 on the mounting bracket 16 and the mounting piece 2b in a state where the bifurcated mounting piece 2b protruding from the rear surface is inserted.
0 is inserted so as to properly support the lower portion of the mast 2.

The mounting pieces 2b provided on the lower left and right sides of the mast 2 are fitted with a turning collar 91 fitted on the support shaft 90, and the center of a collar shaft 92 rotatably fitted on the collar 91. The guide roller 26 is fixed to the portion.

In this embodiment, as shown in FIG. 6, the left mounting bracket 16 is formed so as to protrude long upward, the switching operation tool 8 is provided at this portion, and the switching pin 80 is used to reinforce the side surface of the mast 2. The stop hole 95 for holding the standing posture and the stop hole 96 for holding the inclined posture, which are opened in the plate 93, are selectively engaged with each other so that the inclination angle of the mast 2 with respect to the transmission case 10 can be adjusted in two stages. ing.

As shown in FIG. 6, the switching operation tool 8 is fixed in a pin holder 81 fixed to the mounting bracket 16 in a state in which a switching pin 80 having a knob lever 82 is projected and urged by a spring 83. By pulling the knob lever 82 against the spring 83 to pull out the switching pin 80 from the stop hole 95 or 96, the switching operation of the attitude switching mechanism 9 can be easily performed.

The switching operation tool 8 is not limited to the illustrated example, but may be of another type, and the switching operation tool 8 may be installed on the other mounting bracket 16.

In addition, at positions above and below the support shaft 90,
The stoppers 97 and 98 made of rubber or plastic are also provided for the upper and lower ends of the mast 2 when rotating, and also for preventing vibration and vibration when switching the posture. It is provided in the front part of. The height of the stopper position can be adjusted so that the mast 2 can be elastically pressed against each other at the time of each posture change.

Therefore, the attitude switching mechanism 9 configured as described above can stably support the mast 2 in a rigid frame structure by the mounting bracket 16 that clamps and fixes the transmission case 10 from the left and right.

As shown in FIG. 5, the switching shaft 8 is provided near the axle 1c and the mounting bracket 16 is extended above the supporting shaft 90 to provide the switching operation tool 8. The operation of switching the inclination posture of the mast 2 by the operation tool 8 can be performed easily and quickly from the side of the body 1.

The mast 2 has two mounting brackets 1.
6 having a guide roller 26 installed between them
5 and the switching operation tool 8, the posture is stably held in any of the standing posture shown by the solid line in FIG. 5 and the tilting posture shown by the chain line, so that the lifting and lowering and transport of the mounted object S can be performed by unloading or the like. It can be carried out well without any problem.

As shown in FIGS. 1 to 4, the loading platform 4 extends along both sides of the mast 2 and on both sides of the loading platform 2a.
By providing the support frame 7 at a height approximately equal to or slightly lower than the height of the elevating path, while preventing the load S from being placed on the loading platform 2a from being laterally displaced, A wide object S can be satisfactorily transported. The lower part on both sides of the support frame 7 is located at the front part of the front wheel 1a as shown in FIG. 3, and also serves as a bumper member.

That is, as shown in FIG. 2, the support frame 7 is integrally connected to the upper and lower sides of a rod-shaped side frame 70 positioned at the same width as the left and right widths of the front wheel 1a on both sides of the mast 2 by a horizontal frame 71. A rectangular receiving frame is formed, and the upper, lower, left and right sides of the side frame 70 are detachably attached to both side surfaces of the mast 2 by a plurality of mounting frames 72 to form a rigid frame structure.

In addition, in the above-described structure, the support frame 7 is bent rearward below the side frame 70 as shown in FIG. 3 so that the lower horizontal frame 71 does not largely protrude forward. The bumper portion 75 of the traveling machine body 1 is formed near the lower side of the front wheel 1a.

With this configuration, when a wide object S is placed on the carrier 2a supported by one mast 2 erected at the center front of the body 1 to be transported or lifted, Since the side of the ornament S is supported by the side frame 70 of the support frame 7, the lifting operation is not hindered.
Since the mast 2 is supported over the entire length, the lifting and lowering work of the object S can be stably performed while preventing the load from being unraveled.

Therefore, by adopting a structure in which one mast 2 is supported at the front center of the traveling body 1 so as to be tiltable, the mechanism is simple and inexpensive, and the bed 2a can be reduced in size. Can be.

Further, since the support frame 7 is formed on the rod-shaped side frame 70, the visibility can be improved without obstructing the front view, so that the above operation can be performed accurately. Since the lower portion 7 is the bumper portion 75, no foreign matter is brought into contact with or entangled with the front wheel 1a, and the configuration of the bumper member is simply formed, so that the weight of the bed portion 4 can be reduced as a whole. There are features such as can.

Next, the "fall prevention mechanism 5" installed on the mast 2 will be described with reference to FIGS.

The fall prevention mechanism 5 connects the end of the wire 3 a wound around the guide roller 25 provided at the upper end of the mast 2 and the upper part of the slide portion 21 to the inside of the mast 2.
It is rotatably connected by pawl links 52 via connecting pins 50 and 51 so that the loading platform 2a can be freely moved up and down.
At this time, the pawl link 52 connects the connecting pin 51 to the sliding portion 21.
The connecting pin 51 is formed so as to be rotatably supported by being deviated to the rear wall 2e side (left side) of the mast 2 and having a sharp claw 52a formed on the lower left side of the connecting pin 51. It is connected to the slide portion 21 via the spring 53 and is urged to pull.

The rear wall 2e of the mast 2 has a claw 5
The claw portion 5 is formed along the opposing portion of the locus along which the 2a moves up and down.
A plurality of engagement portions (engagement holes) 93 for locking the 2a are formed.

The drop prevention mechanism 5 having the above-described structure is configured such that the wire 3a wound and supported by the winding drum shaft 32 of the lifting mechanism 3 and the loading platform 2a are claw links 5.
2, the claw link 52 is connected from the wire 3a to the connecting pins 50, 51 by the weight of the carrier 2a.
10 against the spring portion 53 so that
(A), the claw portion 52 a of the claw link 52 is engaged with the engaging portion 55 in the normal state of the carrier 4.
Therefore, the loading platform 2a can be freely moved up and down.

According to this configuration, when the wire 3a is cut off halfway as shown in FIG. 11, or when the winding drum shaft 32 or the like cannot support the wire 3a, the claw link is not used. The pulling force of the wire 3a is released, and the pin 52a is rotated about the connecting pin 51 by the pulling force of the spring portion 53 so as to project the claw portion 52a toward the rear wall 2e, and the support by the wire 3a is lost. The carrier 4 starts to descend, but the claw 52a engages with the nearest engaging portion 55, so that the carrier 4 stops further descending and reliably prevents the carrier 4 from dropping. Is what you can do.

Further, since the fall prevention mechanism 5 is formed so that the claw portion 52a of the claw link 52 is engaged with the rear wall 2e, the fall prevention mechanism 5 has a compact structure in the mast 2 and can be assembled without being exposed to the outside. In addition to this, there are features such as ease of assembly and maintenance, as well as reduction in weight.

In the illustrated example, the fall prevention mechanism 5 is provided with the spring portion 53 as a biasing means to one side of the claw link 52. However, the present invention is not limited to this.
A biasing means in which a weight portion corresponding to the pulling force of the spring portion 53 is integrally formed on the other side of the claw portion 52a.

As shown in FIG. 10 (B), a restriction pin 59 is disposed laterally close to the guide roller 25 to prevent the wire 3a from coming off. This restriction pin 59 has a C-shaped cross section. It is formed by a spring pin, and its insertion side is tightly fitted to one side wall of the mast 2 to be implanted and fixed, and the other side is loosely inserted and fixed to the other side wall of the mast 2.

The transporting vehicle A having the above-described configuration places the object S at a predetermined height in the loading position in which the loading platform 2a shown by the solid line in FIG. When the lever 3L (FIG. 2) is moved upward, the engine E
The power of the motor rotates through a drive shaft, an input shaft and a forward / reverse switching mechanism (not shown in detail), the forward / reverse rotation shaft rotates forward, and the worm wheel shaft and the forward / reverse rotation shaft rotate forward from the forward / reverse rotation shaft. The winding drum shaft 32 in the winding direction. By this transmission, the wire 3a guided to a predetermined path by the guide rollers 25 and 26 is wound around the winding drum shaft 32, and accordingly, the spring portion 53 (FIG. 10) is pulled to rotate the claw link 52. The claw portion 52a is retracted from the inner surface of the mast 2, the engagement between the claw portion 52a and the engaging portion 55 is released, and the loading platform 2a is lifted up to a desired height separated from the ground. is there.

At this time, when the traveling operation lever 3L is turned off (neutral operation), the rotation of the winding drum shaft 32 is stopped via the forward / reverse switching mechanism, and the elevating mechanism serves as the wire 3a having the worm wheel shaft worm-meshed. Of the wire 3a by the load of the carrier 2a.
Is securely prevented from reversing even if it is pulled, and the loading platform 2a can be stopped at a predetermined height position.

Then, by operating the operation lever 1L, the body 1
Traveling, the mission case 1
The weight of the mast 2 and the loading platform 2a erected from 0 is in a state of being borne on the fuselage side (FIGS. 3 and 4).
With the weight of the engine E disposed at the rear of the transmission case 10 and the front and rear weight balance being well balanced, and with the center of gravity positioned at the intermediate portion between the front wheel 1a and the rear wheel 1b, the carrier A The vehicle can be transported with good stability.

Next, when carrying out the loading / unloading operation for loading / unloading the object S at a high position such as a truck bed or a shelf, the cargo bed 2a can be further raised as shown in FIG. When the lifting operation lever 3L is moved downward, the winding drum shaft 32 rotates in the unwinding direction and the wire 3a is unrolled. What can be done.

As described above, the loading platform 2a can be raised and lowered by one mast 2, and the loading platform 4 provided with the support frame 7 framed by a rod-like body can be moved forward as in a conventional device. The driver can safely travel the aircraft from behind the fuselage 1 with the visibility widened without being disturbed by the visibility of the vehicle.

Further, the configuration of the loading section 4 provided with one mast 2 and the support frame 7 makes it possible to accurately grasp the state of loading of the object S and the state of lifting and lowering of the loading section 2a. The loading and unloading work can be performed favorably while preventing collapse.

One mast 2 arranged at the front of the body 1 is formed of a hollow square pipe, and also serves as a guide rail for inserting a part of the slide portion 21 therein and guiding the slide. .

Since the fall prevention mechanism 5 having the claw link 52 is provided above the slide portion 21 in the mast 2, the loading platform 2a can be moved up and down accurately while preventing shaking and rattling. In addition to the above, it is possible to satisfactorily perform operations such as lifting and lowering and operation while reliably preventing the loading platform 2a from falling due to cutting of the wire 3a.

Further, while the structure of the mast 2 and the mechanism 5 for preventing the fall of the loading platform 2a can be simplified, the weight of the loading platform 4 can be reduced, and the body balance can be further improved. There are advantages such as being able to.

Further, as shown in FIG. 1 and FIG. 2, in the transport vehicle A provided with such a loading section 4, the mast 2 is stably stood in the standing posture by the left and right mounting brackets 16 and the posture switching mechanism 9. The loading platform 2a can be lifted and lowered smoothly by being supported.

Further, the mast 2 is held in the tilted posture as shown in FIG. 4 by the switching operation of the posture switching mechanism 9, and the carrying work is stably performed while the load of the mounted object S is applied to the traveling body 1 side. Can be done.

Further, by providing the mast 2 with the bed portion 4 configured as described above, there is an advantage that a large amount of a wide load S can be transported while reducing the size and weight of the bed 2a. is there.

[0058]

As is apparent from the above description, the carrier structure of the carrier according to the present invention is provided with a mast 2 which is capable of lifting and lowering a carrier 2a at the front of a traveling body 1 having a front wheel 1a and a rear wheel 1b. Along with a support frame 7 that supports the object S placed on the carrier 2a from both sides of the mast 2,
The lower part of the support frame 7 is located at the front part of the front wheel 1a so as to also serve as a bumper member.

Therefore, the lifting and lowering and transportation can be performed satisfactorily while the side of the object S is supported by the support frame 7 to prevent collapse of the load.

Further, since the lower part of the support frame 7 in front of the front wheel shaft 1a is formed by a bumper member, the lower end of the support frame 7 can accurately prevent the front wheel 1a from being caught in the front wheel 1a. .

[Brief description of the drawings]

FIG. 1 is a side view of a carrier with a carrier lowered.

FIG. 2 is a plan view of the transport vehicle shown in FIG.

FIG. 3 is a side view showing a state where the bed of FIG. 1 is raised.

FIG. 4 is a side view showing a state where a carrier part of the carrier is in a tilted posture.

FIG. 5 is a side view showing a configuration of a posture switching mechanism.

FIG. 6 is a rear view of the attitude switching mechanism of FIG. 5;

FIG. 7 is a side view showing the configuration of the loading platform.

FIG. 8 is a plan view of the carrier of FIG. 7;

FIG. 9 is a front view of the carrier of FIG. 7;

10A is a side sectional view showing a structure of a mast drop prevention mechanism, FIG. 10B is a back sectional view of FIG. 10A, and FIG.
(C) is a rear view of (A), and (D) is a cross-sectional view of (A) an intermediate portion.

FIG. 11 is a side sectional view showing a fall prevention state of the fall prevention mechanism.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Running body 1a Front wheel 1b Rear wheel 2 Mast 3 Elevating mechanism 3a Wire 4 Carrier part 5 Fall prevention mechanism 7 Support frame 8 Switching operation tool 9 Attitude switching mechanism 10 Transmission case 16 Mounting bracket 21 Slide part 22 Load claw 90 Support shaft A Transport car

Claims (1)

[Claims] 1. A mast 2 having a loading platform 2a capable of ascending and descending is provided at a front portion of a traveling body 1 having a front wheel 1a and a rear wheel 1b, and an object S placed on the loading platform 2a is supported on the mast 2 from both sides. A carrier bed structure for a transport vehicle, wherein a support frame 7 for receiving is provided alongside the support frame 7 and a lower portion of the support frame 7 is located at a front portion of the front wheel 1a so as to also serve as a bumper member.