KR20010031888A - Road roller - Google Patents

Abstract

The present invention is a load roller that can perform the lifting operation quickly and safely when the operator gets into and out of the driver's seat. The step 20 for lifting and lowering provided on the side surface 2B of the front vehicle body 2 is constituted by the lower footrest 21, the middle footrest 22, and the upper footrest 23, and each of these footholds 2l, 22, 23) is made into the staircase shape from which the protrusion length from the side surface 2B of the front vehicle body 2 becomes small from the lower end side to the upper end side. Accordingly, the operator can visually see the protruding end of the lower footrest 21 as a stepping margin further protruding from the protruding end of the middle footrest 22, and the protruding end of the middle footrest 22 protrudes from the upper footrest 23. It is visible as a stepping room that protrudes further from the end. For this reason, the operator can endure while stepping into the driver's seat while observing each footrest 2l, 22, 23 reliably, and can perform the lifting operation quickly and safely.

Description

ROAD ROLLER}

In general, road rollers, such as drum rollers, tire rollers, and macadam rollers, are used for paving road surfaces, and after the paving materials such as gravel and asphalt are placed on the surface of the stationary road surface, the road rollers are driven to run the road rollers. The treading method is adopted.

Therefore, a description will be given with reference to Figs. 17 to 19 of this kind of conventional load roller.

In the drawing, reference numeral 101 denotes a vehicle body of a load roller, and the vehicle body 10l includes a front vehicle body 102 and a rear vehicle body 04 connected to the front vehicle body 102 via a connecting device 103. And between the front body 102 and the rear body 104, the steering cylinder 105 for swinging the rear body 104 in the left and right directions with respect to the front body 102 with the coupling device 103 as the center. ) Is installed.

Here, the front vehicle body 102 is formed in a box shape surrounded by an upper surface (l02A), left and right surfaces (l02B, 102B), and a bottom plate (l08), etc. inside, a prime mover, a hydraulic pump (all of which are not shown), etc. Is housed.

l06 and 106 are a pair of front voltage rollers which are spaced apart in left and right directions so as to be rotatably installed in the front vehicle body 102, and each of the front voltage rollers 106 is made of, for example, a metal drum to form water or the like. It is the structure which can adjust a weight by sealing. A hydraulic motor (not shown) is provided between the front vehicle body 102 and each of the front voltage rollers 106 to rotate the front voltage rollers 106.

107 are l rear voltage rollers rotatably mounted on the rear vehicle body 104, and the rear voltage roller l07 is made of a metal drum having an axial dimension larger than that of the front voltage roller 106. Like the roller 106, the weight is adjusted by sealing water etc. inside. In addition, a hydraulic motor (not shown) is provided between the rear vehicle body 104 and the rear voltage roller 107 to rotate and drive the rear voltage roller 107.

l08 is a bottom plate installed at the rear of the upper surface 102A, which is approximately coplanar with the upper surface 102A of the front body 102, and the bottom plate 108 is formed of a rectangular steel plate and the front surface of the body 102 It is part of. Here, as shown in FIG. 18, the bottom plate 108 is shaded from a central bottom portion 108A located between each side surface 102B of the front vehicle body 102 and each side 1002B of the front vehicle body 102. In the shape of the month of the month, the month of the left is composed of the parts (108B, l08B). And the back of the bottom plate 108, the support (l09) for supporting each driver's seat 110 to be described later is provided to extend in the left and right directions.

110 and 110 are two driver's seats spaced in the left and right directions and disposed on the support 109, and the steering wheel 111 is installed in the front of each driver's l10 in the left and right directions, and the steering wheel ( 1ll is provided with steering steering devices 1212 and 112 at positions corresponding to the respective driver's seats ll0. The steering cylinder 105 is stretched by steering one steering apparatus 112 among the steering apparatuses 112, and the rear vehicle body (022) is formed with respect to the front vehicle body 02 in the center of the connecting device 103. 104 is swung in left and right directions so that the running direction of the road roller is controlled.

1 l3 and l13 are located in the vicinity of the left and right steering apparatuses 112 and installed in the steering wheel 111. The forward and backward levers 113 of each of the forward and backward levers 113 are advanced. The vehicle body 10l moves forward or retracts by tilting to the side or the retracted side. The upper part of each driver's seat 110 is covered with a canopy 114.

115 and 115 are lifting steps for forming a step when the operator moves up and down to the driver's seat 110. Each of the lifting steps 115 is provided on the left and right surfaces 102B of the front body 102, respectively. . As shown in FIG. 19, each elevating step 11 is provided in multiple stages (for example, four provided in the outer plate 116 protruding left and right from the side surface 102B of the front vehicle body 102). Is formed in a vertical ladder shape by the scaffolds 117, l17,. Here, each scaffold 117 is formed of a steel plate bent in a U-shape, for example, and the protruding length S of each scaffold 117 from the side surface 110B of the front vehicle body 102 is set to be the same.

1l8 and 118 are left and right front railings installed in the front angled corners of the bottom plate 108. Each of the front railings 118 is located in front of the elevating step 115 to surround the steering apparatus 112. Is arranged. 119 and 119 are left and right rear handrails which are erected at the rear angled corners of the bottom plate 108, and each rear handrail 119 is located behind the lifting step 115 to surround the driver's seat 110. It is arranged. Each of these handrails 118 and 11l secures the safety when the operator ascending and descending to the driver's seat 110, using the step 115 for the lift, ascends the driver's seat.

The load roller according to the prior art has the configuration as described above. When carrying out the pavement work on the road surface using the load roller, the operator steps the lifting step 115 while holding the handrails ll8 and ll9. As a scaffold, the driver climbs into the driver's seat 110 on the bottom plate 108.

The operator seated in the driver's seat 110 operates the steering wheel 112, the forward and backward lever 1l3, and the like to advance or retreat the load roller so that the surface of the pavement material laid on the road surface is forward voltage roller l06 and rear. The pavement work is carried out by being stepped on by the voltage roller 107.

However, in the above-described load roller according to the prior art, when the operator ascends and lowers the driver's seat 110 by using the elevating step 115 installed in the front vehicle body 102, the following disadvantages exist.

First, when the elevating step 115 is used as a scaffolding, the operator lifts the driver's seat 110 while holding the handrails ll8 and 1l9 in front of the front body 102 and facing the body. Each footrest 117 of the elevating step 115 is stepped out. In this case, since the elevating step 115 is configured in a vertical ladder shape, it is difficult for the operator to see each footrest 117 visually, and the footrest 117 may be lost.

In addition, since each step 117 constituting the elevating step 115 is made of an opaque steel sheet which is bent in a c-shape, for example, an operator seated in the driver's seat 110 moves downward from the bottom plate l08. When looking down to check the pavement state of the road, there is a problem that the clock is blocked by the footrest 117.

In addition, since the footrest 117 is made of steel sheet, there is a problem that the footing 117 easily slips when the operator gets on the driver's seat 110 and the packaging material attached to the shoe falls on the upper surface of the footrest 117.

In addition, since the handrails ll8 and l19 extend upward from the upper surface of the bottom plate 108, the height from the ground to the lower end of the handrail 118 is large, and the operator must extend the arm upward to hold the handrail l18. There is a problem that it is easy to be tired.

For example, when the operator slips on the lower side scaffold ll7 of the elevating step 1l5 at night, during rain, or during snowfall, it is difficult to momentarily hold the handrails ll8 and 1l9 on the bottom plate 108. There is a fear that the operator will roll off the step 115 for lifting.

In addition, the upper part of the elevating step 115 provided on the side surface 102B of the front vehicle body 102 is the bottom portion 108B of the bottom plate 108 which extends from the side surface 102B of the front vehicle body 102 into the sunshade shape. Exists. For this reason, the operator's foot, body, etc. may be caught in the bottom portion 108B of the bottom plate 108 when the operator steps out from the uppermost footrest l17 to the bottom plate 18 during the lifting step l15. There is a problem that a quick ascent to the driver's seat 110 is hindered.

In addition, when the operator inadvertently touches the forward / backward lever 113 at the time of getting on or off the driver's seat 1010, and the forward / backward lever l13 is tilted toward the forward side or the backward side, the vehicle body 101 moves forward against the operator's opinion. There is a problem that the safety at the time of getting on and off the driver's seat 110 by running or retreating.

The present invention relates to a load roller that is suitably used for pavement work such as gravel, asphalt, etc. laid on the road surface.

1 is a front view showing a load roller according to a first embodiment of the present invention,

FIG. 2 is an enlarged front view illustrating the main parts of the lifting step, the front railing, the rear railing, and the movable bottom plate in FIG. 1; FIG.

3 is an enlarged plan view showing main parts of a lifting step, a front railing, a rear railing, a movable floor plate, and the like;

4 is a perspective view showing the step for lifting;

5 is a cross-sectional view of the step for raising and lowering viewed from the arrow V-V direction in FIG. 2;

6 is an enlarged front view of the same position as FIG. 2 showing a state in which the movable bottom plate is in the open position;

7 is an enlarged plan view of a state where the movable bottom plate is in an open position, as seen from above of the bottom plate;

8 is a front view showing a load roller according to a second embodiment;

9 is a perspective view showing the step for lifting in FIG. 8;

10 is an enlarged front view of the same position as FIG. 2 which shows the principal part of the load roller which concerns on 3rd Embodiment;

11 is an enlarged front view illustrating an enlarged view of a movable bottom plate, a switch, and the like in FIG. 10;

12 is a hydraulic circuit diagram showing the roller driving device and the driving force reducing means according to the third embodiment;

FIG. 13 is a hydraulic circuit diagram showing a modification of the roller driving device and the driving force reducing means according to the third embodiment; FIG.

14 is a hydraulic circuit diagram showing another modified example of the roller drive device and the driving force reducing means according to another modified example of the third embodiment;

15 is a perspective view illustrating a modification of the step for lifting up and down;

16 is a perspective view showing another modification of the step for lifting;

17 is a front view showing a load roller according to the prior art,

18 is a plan view showing a load roller according to the prior art,

19 is a cross-sectional view of the step for lifting according to the prior art seen from the arrow XIX-XIX direction in FIG. 17.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a load roller which enables the operator to quickly and safely perform the lifting operation when getting in and out of the driver's seat.

Another object of the present invention is to provide a load roller that allows the operator to enlarge the clock under the bottom plate when the operator rides down.

In addition, another object of the present invention is to provide a road roller that can prevent the vehicle body from running inadvertently when the operator rides down.

In order to solve the above problems, the present invention provides a vehicle body in which a front and rear voltage rollers are rotatably installed, a driver's seat positioned on a bottom plate of the vehicle body, and an elevating step provided on the side of the vehicle body to ascend and lower the driver's seat. Applied to the load roller consisting of.

And the feature of the present invention is that the step for lifting is composed of a plurality of steps of protruding left and right protruding from the side of the vehicle body, each foot is a protruding length from the side of the vehicle body of the footrest on the lower side It is large, and it consists of a staircase shape in which the protrusion length from the side surface of the said vehicle body becomes small gradually toward an upper end side.

With this configuration, the protruding end of the lower side scaffold becomes a scaffold that protrudes further left and right from the protruding end of the upper side scaffold, so when the operator gets on the driver's seat of the load roller, the operator is caught by the upper side scaffold. You can stand firmly while watching the steps of each step without losing. In addition, when the operator gets out of the driver's seat, the operator can make sure that the step of each step can be seen without failing the step of the lower side.

In this case, the present invention consists of a vehicle body comprising a front vehicle body in which a front voltage roller is rotatably installed, and a rear vehicle body in which a rear side voltage roller is rotatably connected to the front vehicle body to install a lifting step on the vehicle body. The configuration can be made.

Moreover, according to this invention, each step which comprises a step for lifting can be made into the staircase shape which shifts the position of a rear end part sequentially toward the upper end side from a lower end side.

As a result, the protruding end of the lower footrest becomes a footrest that protrudes further left and right from the protruding end of the upper footrest, and the rear end of the lower footrest becomes a footrest that protrudes further backward from the rear end of the upper footrest. . Therefore, when the elevating operation is performed using the elevating step as a scaffold, the operator can surely step on the scaffold at each step while visually looking at the scaffold to be stepped on next. For example, even when it is difficult to secure sufficient space for lifting in the left and right directions of the vehicle body during pavement work on narrow roads, the operator can lift the vehicle from the front and rear directions by using the lifting step as a step. can do.

Moreover, this invention can be set as the structure which provides the see-through opening for looking out the road surface from the bottom plate of a vehicle body in the step of each step which comprises a lifting step.

In this case, for example, in the pavement work of the road surface, the operator can visually see the road surface through the see-through opening provided on the foot plate from the upper side of the bottom plate, so that the state of the road surface can be easily checked. In addition, even if the packaging material attached to the shoe falls on the footrest when the operator gets on the driver's seat, the packaging material or the like can be discharged through the see-through opening of the footrest, thereby preventing slipping during the lifting.

In the present invention, a fuel tank or an operating oil tank is provided on the side of the vehicle body, and a plurality of steps of scaffolds positioned at least on the lower end side of the steps of the step forming the lifting step are fixed to the side of the tank. You can make it a configuration.

As a result, the length of the left and right directions of the plural-stage scaffolding fixed to the side of the tank can be shortened by the amount of the tank protruding from the side of the vehicle body.

In addition, according to the present invention, two driver's seats are spaced apart from each other in the left and right directions on the bottom plate of the vehicle body, and the elevating step may be provided on the left and right sides of the vehicle body, respectively.

Thus, for example, when the left side of the road surface is paved, the driving of the vehicle body can be controlled from the left driver's seat, and when the right side of the road surface is paved, the driving of the body can be controlled from the driver's seat of the right side. The step can be taken up and down by using the step.

In addition, the present invention is provided with a railing on the vehicle body, which is located on one side or both sides of the step for lifting and extending upward and downward, and the lower end side of the railing extends below the bottom plate of the vehicle body. You can do

In this case, when the driver's seat is raised and lowered using the step for lifting, the operator can step up and down while holding the handrail securely from the ground to the floor plate provided with the driver's seat. Therefore, the driver's seat can be safely lifted and lowered, and the operator's fatigue can be reduced.

In another aspect, the present invention is composed of a front vehicle body in which the front voltage roller is rotatably installed, and a rear vehicle body connected to the front vehicle body in which the rear voltage roller is rotatable, and the front vehicle body has a step for lifting up and down. Before and after installation, the rails are installed on both sides of the rear and extend in the up and down direction, and the front railing extends below the bottom plate of the front body between the front voltage roller and the lifting step, The handrail can be configured to extend downward from the bottom plate of the front vehicle body between the connecting portion of the front vehicle body and the rear vehicle body and the step for lifting.

As a result, the operator can move up and down by using the lifting step as a scaffold while holding the handrail provided in the front vehicle body. In this case, even if the operator rolls away from the lifting step, the operator grasps the front railing to prevent it from falling to the front side of the voltage roller. You can prevent it.

In addition, the present invention has a configuration in which a notch portion is provided at a portion corresponding to the step for lifting in the bottom plate of the vehicle body, and the movable plate is provided at the bottom plate which is moved between an open position of closing the notch portion and a closed position of closing. can do.

Accordingly, the position of the notch portion can be opened with the movable bottom plate in the open position at the time of getting on and off the driver's seat. Therefore, when the operator steps out from the step for lifting to the bottom plate, the operator's foot, body, and the like can pass through the position of the notch portion. As a result, the operator can prevent foot, body, etc. from being caught on the floor plate during the elevating operation, and the elevating to the driver's seat can be performed quickly and safely.

According to the present invention, a bottom portion of the vehicle body is provided with a portion extending beyond the side of the vehicle body at least on the side where the lifting step is provided, and the notch portion is provided at a position corresponding to the lifting step on the inner portion. It is possible to provide a structure in which a movable bottom plate which is movable between an open position of opening the notch and a closed position of closing is provided.

Accordingly, the position of the notch portion can be opened at the time of lifting by setting the movable bottom plate to the open position. Therefore, when the operator steps out from the step for lifting to the bottom plate, the operator's feet, body, etc. can pass through the position of the notch, so that the lifting operation can be performed quickly. In addition, during the paving operation, by closing the notch portion with the movable bottom plate in the closed position, a wide scaffold can be secured on the extruded portion, thereby improving the workability of the paving operation.

In addition, the present invention is provided with a notch portion in the portion corresponding to the step for lifting in the bottom plate of the vehicle body, the movable plate is provided on the bottom plate which is moved between the open position of the opening and the closed position of the notch. The movable bottom plate can be provided with an operation member for opening and closing the movable bottom plate.

Accordingly, it is possible to easily open and close the movable bottom plate while holding the operation member, thereby preventing a hand or the like from being caught between the notch portion and the movable bottom plate.

In addition, the present invention allows the operation member to move up and down between the bottom plate and the elevating step when the movable bottom plate is in the open position, and prohibit the elevating between the bottom plate and the elevating step when the movable bottom plate is in the closed position. It is with a gate lock lever.

Therefore, when the movable bottom plate is in the closed position, the gate lock lever prohibits the lifting between the bottom plate and the lifting step. Prohibition can be ensured to ensure the safety of packaging work.

In addition, the present invention is provided with a handrail extending on the one side or both sides of the rear direction and extending upward and downward in the vehicle body, and the lower end side of the railing extends below the bottom plate of the vehicle body. In the bottom plate of the vehicle body, the notch part is provided in the part corresponding to the step for raising and lowering, and the movable plate is installed in the bottom plate which moves between the open position which opens this notch part, and the closed position which closes. The movable bottom plate can be provided with an operation member for opening and closing the movable bottom plate.

As a result, when the elevating step is used as the scaffold, the operator can step up the elevating step while holding the handrail securely. In addition, by opening the notch with the movable bottom plate open, the operator's foot and body can pass through the notch when the operator steps out of the lift step to the bottom plate. Can be.

In addition, the present invention is provided with a detection means for detecting that the movable bottom plate is in the open position or the closed position, and the roller drive device for driving the voltage roller is detected by the detection means when the movable bottom plate is in the open position. The driving force reducing means for reducing the driving force of the voltage roller can be provided.

In this case, when the movable bottom plate is brought into the open position at the time of getting in and out of the driver's seat, the driving force reducing means can reduce the driving force of the voltage roller. Therefore, even if the voltage rollers are inadvertently operated when the operator gets in and out of the driver's seat, the vehicle body can be started and stopped suddenly in contradiction to the operator's idea, thereby ensuring safety during the lift.

In addition, the present invention provides a variable displacement hydraulic pump having a capacity variable portion driven by a prime mover, a hydraulic motor for rotating the voltage roller by pressure oil supplied from the hydraulic pump, and a cylinder into two oil chambers. It is provided in the middle of the light transmission actuator which forwards or reverses the hydraulic motor by turning the capacity variable part of the said hydraulic pump according to the displacement of a piston, and the pipe connecting this light actuator and a pilot hydraulic source. And a direction change valve for rotating the hydraulic motor forward and reverse by switching the direction of the hydraulic oil delivered to the light actuator. A driving force reducing means is connected between the direction change valve and each oil chamber of the light actuator. Bypass installed between two pipelines or between each oil chamber of the light actuator Opening and closing the bypass pipe when the moving bottom plate is in the open position by the detecting means and installed in the middle of the bypass pipe, and closing the bypass pipe when detecting that the movable bottom plate is in the closed position. It is comprised by a valve.

In such a configuration, when the movable bottom plate is in the open position, the on-off valve opens the bypass pipe, so that the oil chambers of the light actuator are substantially equal in pressure, so that the variable capacity portion of the hydraulic pump is maintained at the neutral position. As a result, when the operator moves up and down, the hydraulic motor rotates forward or reverses contrary to the operator's idea, and thus the vehicle body can be suppressed from suddenly starting.

The present invention also relates to a variable displacement hydraulic pump having a capacity variable portion driven by a prime mover, a hydraulic motor for rotating the voltage rollers by hydraulic pressure supplied from the hydraulic pump, and hydraulic pressure supplied from the outside. Accordingly, the light displacement actuator for forward or reverse rotation of the hydraulic motor by rotating the displacement variable portion of the hydraulic pump and the pipeline connecting the light actuator and the pilot hydraulic source, and the direction of the pressure oil delivered to the light actuator And a direction change valve for rotating the hydraulic motor forwardly and reversely. The driving force reduction means is located upstream from the direction changeover valve and installed in the middle of the pipeline. When it is detected that it is in the open position, the hydraulic oil in the light actuator When it detects that it has been made into the closed position, it is comprised by the opening / closing valve which supplies a hydraulic oil in the said light actuator.

In such a configuration, when the movable bottom plate is brought into the open position, the on-off valve is allowed to escape the hydraulic oil in the light actuator, so that the variable capacity portion of the hydraulic pump maintains the neutral position. As a result, when the operator moves up and down, the hydraulic motor is rotated forward or reverse against the operator's idea, and thus the vehicle body can be prevented from suddenly starting.

The present invention also provides a variable displacement hydraulic pump having a capacity variable portion driven by a prime mover, a hydraulic motor for rotating the voltage roller by pressure oil supplied from the hydraulic pump, and the hydraulic motor during parking. And a parking brake for releasing the braking force during operation of the hydraulic motor. The driving force reducing means is installed in the middle of a brake pipe that supplies the brake release pressure oil to the parking brake. When it is detected that the vehicle is in the open position, the pressurized oil in the parking brake is discharged, and when it is detected that it is in the closed position, it is constituted by an on / off valve for supplying the hydraulic oil in the parking brake.

In such a configuration, when the movable base plate is in the open position, the on-off valve causes the hydraulic oil in the parking brake to escape, so that the braking force is applied to the hydraulic motor by the parking brake. As a result, when the operator moves up and down, the vehicle body can be suppressed from suddenly starting up or down against the operator's idea.

In addition, the present invention is a load roller comprising a vehicle body rotatably installed before and after the voltage roller, a driver's seat positioned on the bottom plate of the vehicle body, and an elevating step provided on the side of the vehicle body to ascend and lower the driver's seat. The vehicle body is provided with railings extending in the up and down directions on one side or both sides of the lifting step, and the lower end side of the railing extends below the bottom plate of the vehicle body. There is one.

With this arrangement, when the elevating step is used as a scaffold, the operator can step up and down while holding the handrail securely from the ground to the bottom plate provided with the driver's seat. This makes it possible to safely get on and off the driver's seat, and to reduce the fatigue of the operator when getting on and off.

In addition, the present invention is a load roller comprising a vehicle body in which the front and rear voltage rollers are rotatably installed, a driver's seat positioned on the bottom plate of the vehicle body, and a lifting step provided on the side of the vehicle body for lifting the driver's seat. And a notch portion is provided at a portion corresponding to the step for lifting in the bottom plate of the vehicle body, and the movable plate is provided at the bottom plate which is moved between an open position of opening the notch and a closed position of closing. The bottom plate is provided with an operation member for opening and closing the movable bottom plate.

With this configuration, the operator can easily open the notch by opening the movable base plate in the open position by the operation member, and the operator can easily pass the position of the notch by the operation member. It is possible to prevent foot, body, etc. from being caught on the plate and to lose the lifting step, and the lifting operation can be performed quickly and safely.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the load roller by this invention is described in detail, referring FIGS. 1-16.

First, Figs. 1 to 7 show the first embodiment, in which 1 is the body of the load roller, and the body 1 is the front body 2 in which the front voltage roller 6, which is described later, is rotatably installed. The rear voltage roller 7, which is later described, is rotatably installed and consists of a rear vehicle body 4 connected to the front vehicle body 2 via a connecting device 3. And between the front body (2) and the rear body (4) a steering cylinder for swinging the rear body (4) in the left and right directions with respect to the front body (2) around the connecting device (3) ( 5) is arranged.

Here, the front vehicle body 2 is formed in a box shape surrounded by the upper surface 2A, the left and right surfaces 2B and 2B, and the bottom plate 8 to be described later, and the inside of the prime mover, the hydraulic pump (all not shown), etc. Is housed.

6 and 6 are a pair of front voltage rollers, which are spaced apart in left and right directions so as to be rotatably installed in the front vehicle body 2, each of the front voltage rollers 6 is made of, for example, a metal drum, The weight is adjusted by sealing. A hydraulic motor (not shown) is provided between the front vehicle body 2 and the front voltage rollers 6 to rotate the front voltage rollers 6.

7 denotes l rear voltage rollers rotatably mounted on the rear body 4, and the rear voltage roller 7 is made of a metal drum having an axial dimension larger than that of the front voltage roller 6, and the front voltage Like the roller 6, the weight is adjusted by sealing water inside. A hydraulic motor (not shown) is provided between the rear vehicle body 4 and the rear voltage roller 7 to drive the rear voltage roller 7 in rotation.

Then, by rotating the hydraulic motor for rotating each of the front voltage rollers 6 and the hydraulic motor for rotating the rear voltage rollers 7 at the same rotation speed, the vehicle body 1 travels on the road surface, and each of the front voltage rollers is rotated. (6) It is the structure which voltages the packaging material spread on the road surface by the back voltage roller 7. As shown in FIG.

8 is a bottom plate according to the present embodiment which is substantially coplanar with the upper surface 2A of the front vehicle body 2 and is provided at the rear of the upper surface 2A, and the bottom plate 8 is the front portion as shown in FIG. It is provided on both the left and right sides of the center bottom portion 8A having a width dimension positioned between the left and right sides 2B of the vehicle body 2, and on the left and right sides of the center bottom portion 8A. The left and right inner months extending from the right side 2B in the shape of sunshade in the left and right directions are composed of the parts 8B and 8B. And the support part 9 for supporting each driver's seat 14 mentioned later is extended in the left and right direction by the back part of the bottom plate 8, and is installed.

10 and 10 are notch parts of the left and right parts provided in the site | part corresponding to the step 20 for elevating of the lower part 8B, and each notch part 10B of the bottom plate 8, and each notch part 10 is a butt part. It is formed by notching the site | part which becomes upper part of the lifting | retraction step 20 in 8B in concave shape. And the notch part 10 is when the operator who raises and lowers the driver's seat 14 ascends from the elevating step 20 to the bottom plate 8, or falls down from the bottom plate 8 to the elevating step 20, When the operator passes the foot, the body, or the like, a part of the body is prevented from being caught by the end portion 8B of the bottom plate 8 and the operator can move up and down smoothly.

11 and 11 are left and right movable bottom plates rotatably installed on the inner end portion 8B of the bottom plate 8 to open and close the notch portion 10. Each movable bottom plate 11 is a notch portion ( It consists of a steel plate having approximately the same shape as 10). And the movable bottom plate 11 is provided so that the inner end of the bottom plate 8 can be rotated to the part 8B by the hinge members l2 and 12 at the rear end side, and centered around each hinge member 12, respectively. And the rotational position between the open position (position of FIG. 6, FIG. 7) which opens the notch part 10, and the closed position (position of FIG. 2, FIG. 3) which closes the notch part 10. As shown in FIG.

l3 and 13 are gate lock levers provided as operating members respectively provided on the left and right movable bottom plates 11, and the gate lock levers 13 are formed of a bar bar bent in a substantially C-shape, and the lower end side thereof is a movable floor. The upper surface of the plate 11 is fixed by welding or the like. Therefore, the gate lock lever 13 is configured as an operation member which can easily open and close the movable bottom plate 11 by rotating the movable bottom plate 11.

The gate lock lever 13 has a protruding portion 13A projecting upward in a state where the movable bottom plate 11 is in the closed position. The projection l3A of the gate lock lever 13 is raised to block the passage between the bottom plate 8 and the driver's seat 14 when the movable bottom plate 11 is in the closed position, as shown in FIG. It is forbidden that an operator or the like inadvertently lifts and lowers between the bottom plate 8 and the driver's seat 14 at the time of work. On the other hand, when the movable bottom plate 11 is in the open position, the gate lock lever 14 opens the passage between the bottom plate 8 and the driver's seat 14 as shown in FIG. To allow the elevating between the driver's seat 14 and the driver's seat 14.

L4 and 14 are two driver's seats spaced in the left and right directions and arranged on the support 9, and a steering wheel l5 extends left and right in front of each driver's seat 14, and the steering wheel ( 15, steering steering devices 16, l6, etc., are provided at positions corresponding to the driver's seat 14, respectively. By steering one of the steering devices 16 of the steering devices 16, the above-described steering cylinder 5 expands and contracts, and the rear vehicle body 4 with respect to the front vehicle body 2 centering on the coupling device 3. The driving direction of the load roller is controlled by swinging in the left and right directions.

In this case, when stepping on the paving material on the road surface using the load roller, for example, when the front voltage roller 6 or the like goes up on the curbstones installed on both the left and right sides of the road surface, the curbstone or the like is the front voltage roller. There is a risk of being damaged by (6). For this reason, for example, when paving the right side of the road surface, the operator controls the running of the load roller by the steering device 16 on the right side in order to monitor the interference between the front voltage roller 6 on the right side and the curb. On the other hand, when paving the left side of the road surface, the operator is configured to control the running of the load roller by the steering device 16 on the left side in order to monitor the interference between the front voltage roller 6 on the left side and the curbstone.

7 and 17 are forward and backward levers located on the steering wheel 15 located near the left and right steering devices 16, and each of the forward and backward levers 17 is tilted to the forward side or the retracted side. l) consists of driving forward or retreating. The upper part of each driver's seat 14 is covered with a canopy 18.

19 and l9 are tanks provided on the left and right sides 2B of the front vehicle body 2, respectively, and the tanks 19 are upper surfaces l9A, lower surfaces l9B, and front surfaces (as shown in Figs. 4 and 5). 19C), the back surface 19D and the left and right side surfaces 19E and l9E are formed in the box shape of the cuboid. And the tank 19 is supplied to the fuel supplied to the prime mover (not shown) accommodated in the interior of the front vehicle body 2, or to each hydraulic motor for rotationally driving the front voltage roller 6, the rear voltage roller 7 It is to store working oil.

20 and 20 are left and right elevating steps according to the present embodiment, and each elevating step 20 is installed on the left and right sides 2B and 2B of the front vehicle body 2 using the tank 19, respectively. It is.

Here, the step 20 for elevating is a three-stage scaffold provided on the side surface 2B of the front vehicle body 2 via the tank 19, that is, the lower scaffold 21 provided on the lower side of the side surface 19E of the tank 19. And a suspension scaffold 22 disposed above the lower scaffold 21 and installed on the side surface 19E of the tank 19, and an upper scaffold 23 provided on the upper surface 19A of the tank 19. It is.

Here, the lower footrest 21 is a rectangular frame body 2lA fixed to the side surface l9E of the tank 19 by welding or the like, and extends in the front and back directions inside the frame body 2lA to form a rectangular shape. It consists of three spacer plates 21B installed. Moreover, four perspective openings 21C which are opened in the upper and lower directions are formed between the frame body 2LA and the spacer plate 21B and between the spacer plates 2B. The lower footrest 21 projects from the side surface 2B of the front vehicle body 2 toward the left side with a protruding length L1.

In addition, the suspended scaffold 22 has a rectangular frame body 22A fixed to the side surface 19E of the tank 19 by welding or the like in substantially the same way as the lower foot plate 21, and inside the frame body 22A. It consists of l spacer plates 22B extended and installed in the front and rear directions. Moreover, the two see-through openings 22C opened in the upper and lower directions are formed between the frame body 22A and the spacer plate 22B. Then, the suspended footrest 22 protrudes from the side surface 2B of the front vehicle body 2 toward the left side with the protruding length L2, and this protruding length L2 is larger than the protruding length L1 of the lower footrest 21. It is set small (L2 < Ll).

In addition, the upper scaffold 23 has a rectangular frame body 23A fixed to the upper surface 19A of the tank 19 by welding or the like in substantially the same way as the lower scaffold 21, and inside the frame body 23A. It consists of one spacer board 23B extended and installed in the front and rear directions. Moreover, the two see-through openings 23C opened in the up and down directions are formed between the frame body 23A and the spacer plate 23B. The upper footrest 23 protrudes from the side surface 2B of the front vehicle body 2 toward the left side with a protruding length L3, and this protruding length L3 is larger than the protruding length L2 of the middle footrest 22. Small (L3 < L2) is set. In addition, in this embodiment, since the upper end scaffold 23 is being fixed to the upper surface 19A of the tank 19, the perforation opening 23C of the upper end scaffold 23 is set by the upper surface l9A of the tank 19. In FIG. Blocked

In this way, the step 20 for elevating is constituted by the lower footrest 2l, the suspended footrest 22, and the upper footrest 23. Each footrest 2l, 22, 23 has a large protruding length from the side surface 2B of the front vehicle body 2 of the bottom foot [lower footrest 2l] side scaffold, and toward the upper end (upper footrest 23). The protruding length from the side surface 2B of the front vehicle body 2 is stepped. Accordingly, the protruding end of the lower footrest 2l is a stepping margin that protrudes from the protruding end of the suspended footrest 22 again in the left and right directions, and the protruding end of the suspended footrest 22 protrudes from the upper footrest 23. Since it becomes a stepping room which protrudes from the left and right again from the operator, the operator is able to stand while looking at each scaffold 21, 22, 23 reliably.

24 and 24 are front railings provided at the front of the left and right steel step 20, respectively, and the front railings 24 are smaller than the steering apparatus 16 and the forward and backward lever 17 as shown in Figs. The inner month of the bottom plate 8 is fixed to the portion 8B by the attachment plate 25 and is positioned at the front, and the upwardly rising portion 24A and the rear portion from the upper end side of the rising portion 24A are rearward. The horizontal portion 24B which is bent and extended in the horizontal direction in parallel with the bottom plate 8 and bent downward from the rear end side of the horizontal portion 24B to be vertically lowered downward from the top of the bottom plate 8. It consists of 24C of vertical drops.

Here, the upper and lower middle portions of the vertical lowering portion 24C are firmly supported by the bracket 26 fixed to the bottom plate 8. In addition, the lower end side positioned below the vertical lowering part 24C bracket 26 is lower than the bottom plate 8 between the front voltage roller 6 and the step 20 for lifting, for example, the front voltage roller 6. It extends to the position where it does not collide with the rear part of), ie, the intermediate position of the interrupting step 22 and the upper step 23.

27 and 27 are rear handrails provided at the rear of the left and the stepping steel 20, respectively, and the rear handrail 27 is located between the front and rear handrails 24 with the lifting step 20 between the front and rear directions. It is arranged as if I put it on. The rear railing 27 is located at the rear of the driver's seat 14 and fixed to the support 9 by the mounting plate 28, and the upwardly raised portion 27A and the upper end of the raised portion 27A. A horizontal portion 27B that is folded forward from the side and extends in a horizontal direction parallel to the bottom plate 8, a lower portion 27C that is folded downward from the front end side of the horizontal portion 27B, and a horizontal portion ( It consists of the vertical down part 27D which is fixed to the intermediate part of the front and back direction of 27B) and descends perpendicularly downward from the upper side of the bottom plate 8. As shown in FIG.

Here, the upper and lower middle portions of the vertically lowering portion 27D are firmly supported by the bracket 29 fixed to the bottom plate 8, and are positioned below the bracket 29 of the vertically lowering portion 27D. The lower side is extended between the connecting device 3 and the elevating step 20 to a position lower than the bottom plate 8, for example, lower than the suspended foot plate 22, so that the operator lifts the lower foot plate 2l. You can grab it right when you step on it.

Therefore, when getting on the driver's seat 14, the operator lifts the vertical lowering portion 24C of the front railing 24 and the vertical lowering portion 27D of the rear railing 27 without extending the arm to the upper side of the bottom plate 8. Each footrest 21, 22, 23 of the elevating step 20 can be stepped out while holding it in an unreasonable posture. For example, even when the operator slips on the lower footrest 2l, the lower end side of the vertically lowering part 24C of the front handrail 24 or the lower side of the vertically lowering part 27D of the rear handrail 27 is instantaneously. It is configured to catch.

The load roller according to the present embodiment has the configuration as described above. When carrying out the pavement work on the road surface using the load roller, the operator steps the lifting step 20 while holding the handrails 24 and 27. As a scaffold, the driver rides on the driver's seat 14 on the bottom plate 8.

The operator seated in the driver's seat 14 drives the road roller forward or backward while operating the steering device 16, the forward and backward lever 17, and the like. The pavement work is carried out by stepping on the voltage roller 7.

Moreover, according to this embodiment, the operator is improved so that the operator can get on and off the driver's seat 14 quickly and safely, and the lifting operation of the operator will be described below.

First, when getting on the driver's seat 14, the operator opposes the lifting step 20 in front and moves the vertical lowering part 24C of the front handrail 24 and the vertical lowering part 27D of the rear handrail 27. While holding, the lower step 21, the stop step 22, and the upper step 23 of the lifting step 20 step out.

Here, the operator rotates the movable bottom plate 11 to the open position shown to FIG. 6 and FIG. 7 when it reaches the stopping step 22, for example, and opens the notch part 10 of the bottom plate 8. As shown in FIG. In this case, since the gate lock lever 13 is installed in the movable bottom plate 11, the operator can operate the gate lock lever 13 so that the operator does not get his hand between the movable bottom plate 11 and the notch 10. The movable bottom plate 11 can be easily rotated to the open position.

And the operator pushes out the bottom plate 8 from the upper plate 23 through the notch 10. At this time, since the notch part 10 is open, the operator can quickly get on the driver's seat 14 without the foot, body, etc. hanging on the inner part of the bottom plate 8, 8B.

On the other hand, when getting off from the driver's seat 14, the operator holds the vertical lowering part 24C of the front railing 24 and the vertical lowering part 27D of the rear railing 27 with the driver's seat facing the back. (8) The road surface can be quickly reached by stepping out the upper step 23, the stopping step 22 and the lower step 2l of the step 20 for lifting up and down sequentially.

In this case, in this embodiment, the protruding length from the side surface 2B of the front part vehicle body 2 of the lower side (lower side plate 2l) side footing of each footrest 21, 22, 23 which comprises the step 20 for lifting | lowering is made. It is large, and it becomes a staircase shape in which the protrusion length from the side surface 2B of the front part vehicle body 2 gradually decreases toward the upper end (upper footrest 23) side. Accordingly, the operator can visually see the protruding end portion of the suspended footrest 22 as a stepping margin further protruding from the protruding end of the upper footrest 23, and the protruding end of the lower footrest 21 protrudes from the suspended footrest 22. It is visible as a stepping room that protrudes further from the end. For this reason, the operator can step on and off the driver's seat 14 while looking at each step 21, 22, 23 reliably when getting off the driver's seat 14 and performing the lifting operation quickly and safely.

In addition, the lower scaffold 21, the interrupting scaffold 22, and the upper scaffold 23 constituting the elevating step 20 are provided with see-through openings 21C, 22C, and 23C which are respectively opened in the upward and downward directions. It is. Therefore, even if asphalt falls on the lower scaffold 21, the suspended scaffold 22, and the upper scaffold 23, the asphalt can be discharged through the see-through openings 21C, 22C, and 23C. Slip on each scaffold 2l, 22, 23 can be prevented.

In addition, the front handrail 24 and the rear handrail 27 are provided in the front and rear directions of the lifting step 20, and the vertical lowering part 24C and the rear handrail 27 of the front handrail 24 are vertically lowered. The 27D is configured to extend downward from the bottom plate 8. Accordingly, the operator can quickly and safely grasp the vertical lower portion 24C of the front railing 24 and the vertical lower portion 27D of the rear railing 27 in a comfortable position without extending the arm upwards of the base plate 8. We can get on driver's seat 14 and get on. In addition, when getting off the ground from the driver's seat 14, the operator moves his back toward the driver's seat 14 and reaches the road surface from the driver's seat 14 until the vehicle reaches the road surface. The vertically lowered portion 27D of the 27 can be always grasped and can be safely released from the driver's seat 14.

For this reason, even when the operator slips on the footrests 21, 22, and 23 of the step 20 for lifting at night, during rain, and during snowfall, the front railing 24 and the rear railing 27 are used. It can support and secure safety at the time of getting on and off.

In addition, the lower end side of the vertically lowering portion 24C of the front railing 24 extends to the intermediate position between the stopping step 22 and the upper step 23 between the front voltage roller 6 and the step 20 for lifting, The lower end side of the vertically lowering part 27D of the rear handrail 27 is extended so that it may extend below the stopping step 22 between the connecting device 3 and the elevating step 20. Therefore, even if the operator rolls away from the step 20 for lifting, the instep of the operator is rolled up to the front voltage roller 6 or the front body 2 and the rear body 4 connected by the connecting device 3. It can be prevented from being caught in between, further improving the safety at the time of lifting.

Next, when the operator who rides on the driver's seat 14 carries out the paving work of stepping on the pavement such as asphalt by the road roller, the operator rotates the movable base plate 11 to the closed position shown in FIG. After closing the notch portion 10 of the plate 8, the steering apparatus l6, the forward and backward lever 17, etc. are operated to drive the load roller to the front voltage roller 6 and the rear voltage roller 7. By stepping on the packaging material.

Here, for example, the operator looks down the road surface from the bottom plate 8 in a state where the operator stands on the bottom plate 8 to check the pavement of the road surface by the front voltage roller 6 and the rear voltage roller 7. In the case of viewing, a wide footrest can be secured on the bottom plate 8 by closing the notch portion 10 of the bottom plate 8 by the movable bottom plate 11.

When the operator confirms the pavement condition of the road surface on the bottom plate 8, the operator opens each of the see-through openings 22C provided in the suspended scaffold 22, and each see-through opening 2cC provided in the lower scaffold 21. You can look out over the road. For this reason, the operator can carry out pavement work while checking the pavement condition of the road surface from the driver's seat 14 side for a wide range, and the workability can be greatly improved.

Further, in the state where the movable bottom plate 11 is in the closed position, the protrusion 13A of the gate lock lever 13 protrudes upward of the movable bottom plate 11, and between the bottom plate 8 and the driver's seat 14 is provided. Elevate to block the passage. Therefore, the gate lock lever 13 can prohibit the operator from inadvertently getting out of the driver's seat 14 during the pavement work or from inadvertently getting on the driver's seat 14 by another person, thereby ensuring safety during the pavement work. Can be.

Next, FIG. 8 and FIG. 9 show a second embodiment according to the present invention, and the feature of the present embodiment is a step in which the positions of the rear end portions are sequentially shifted forward from the lower end side to the upper end side of each scaffold constituting the elevating step. It is in shape. In addition, in this embodiment, the same code | symbol is attached | subjected to the same component as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

In the figure, 31 is a left and a step for raising and lowering (only the left side shown) applied to this embodiment instead of the respective steps for lifting and lowering 20 according to the first embodiment, and the step for lifting and lowering 31 is a tank 19. It is installed on the left and right side surfaces 2B of the front vehicle body 2 by using the two.

And the step 31 for elevating is a three-stage scaffold provided on the side surface 2B of the front vehicle body 2 via the tank 19, that is, the lower scaffold 32 provided on the lower side of the side surface 19E of the tank 19. And the upper side of the lower side step 32 and the upper side of the side 19E of the tank 19 located at the upper side of the stop step 33 and the stopping step 33 installed on the side 19E of the tank 19. It consists of an upper footrest 34 installed on.

As shown in Fig. 9, the lower footrest 32 is formed in a rectangular frame body 32A fixed to the side surface 19E of the tank 19 by welding or the like and in the front and rear directions inside the frame body 32A. It consists of four spacer plates 32B extended and provided in a rectangular shape. Then, five perspective openings 32C open in the upper and lower directions are formed between the frame body 32A and the spacer plate 32B and between the spacer plates 32B. And the lower footrest 32 protrudes with the longest protruding length A1 toward the left side from the side surface 19E of the tank 19. As shown in FIG. In addition, the length B1 in the front and rear directions of the lower scaffold 32 is set to be substantially the same as the length in the front and rear directions of the tank 19, and the front end portion 32Al of the frame body 32A is the tank 19. Is in the same position as the front face 19C of the rear face, and the rear end 32A2 is also in the same position as the rear face l9D of the tank 19.

The suspended scaffold 33 is located above the lower scaffold 32 and is moved to the inside of the frame 33A and the rectangular frame body 33A fixed to the side surface l9E of the tank 19 by welding or the like. And three spacer plates 33B extending in a rearward direction and installed in a rectangular shape. Four apertures 33C for opening in the upper and lower directions are formed between the frame body 33A and the spacer plate 33B and between the spacer plates 33B.

Then, the suspended scaffold 33 protrudes from the side surface l9E of the tank 19 with the protruding length A2, and this protruding length A2 is smaller than the protruding length A1 of the lower scaffold 32 (A2 < Al) is set. In addition, the length B2 in the front and rear directions of the suspended scaffold 33 is set smaller than the length B1 in the front and rear directions of the lower scaffold 32 (B2 < Bl), and the front end of the frame body 33A. 33A1 is shifted backward by the length C2 from the front surface 19C of the tank 19, and similarly, the rear end 33A2 is shifted forward by the length D2 from the rear surface 19D of the tank 19. As shown in FIG.

In addition, the upper footrest 34 is located above the middle footrest 33 and is moved to the inside of the frame body 34A and the rectangular frame body 34A fixed to the side surface l9E of the tank 19 by welding or the like. It consists of two spacer plates 34B extended and installed in the rear direction. And between the frame body 3A and the spacer plate 34B, and between each spacer plate 34B, three perspective openings 34C opened in the upper and lower directions are formed.

The upper footrest 34 protrudes from the side surface l9E of the tank 19 with the protruding length A3, and the protruding length A3 is smaller than the protruding length A2 of the middle footrest 33 (A3 < A2) It is set. The length B3 in the front and rear directions of the upper scaffold 34 is set to be substantially equal to the length B2 in the front and rear directions of the suspended scaffold 33, and the front end 34A1 of the frame body 3A is It is in the same position as the front surface 19C of the tank 19. However, the rear end portion 34A2 of the frame body 3A is shifted forward by the length D3 from the rear surface 19D of the tank 19, and this length D3 is the rear surface 19D of the tank 19 described above. From the length D2 to the rear end 33A2 of the frame body 33A of the suspended scaffold 33 is set larger than (D3> D2).

In this manner, each of the scaffolds 32, 33, and 34 constituting the step 31 for elevating is sequentially projected from the side surface l9E of the tank 19 toward the upper scaffold 34 from the lower scaffold 32. It becomes small, and is comprised in the staircase shape which shifts the position of a rear end toward the upper stage 34 from the lower stage 32 in order one by one. The load roller according to the present embodiment has the above-described lifting and lowering step 31, and there is no particular difference in the basic operation of stepping on asphalt or the like laid on the road surface during pavement work. .

Therefore, according to the present embodiment, the front vehicle bodies 2 are moved from the lower end (lower footrest 32) side to the upper end (upper footrest 34) side of the footrests 32, 33, and 34 constituting the step 31 for lifting. The protruding length from the side surface 2B of the slit) is formed in a step shape that is sequentially reduced. Therefore, the protruding end of the suspended footrest 33 can be seen as a stepping margin further protruding from the protruding end of the upper footrest 34, and the protruding end of the lower footrest 32 is further protruded from the protruding end of the middle footrest 33. It can be seen as a protruding step margin.

Therefore, at the time of elevating, the operator can reliably step out while looking at each of these steps 32, 33, and 34 at all times, and can quickly and safely move up and down to the driver's seat 14.

In addition, the steps 32, 33 and 34 of the step 31 for lifting and lowering are in a stepped shape in which the rear end positions are sequentially shifted from the lower end (lower footrest 32) side toward the upper end (upper footrest 34) side. Consists of. Therefore, even when it is difficult to ensure sufficient space for lifting in the left and right directions of the front vehicle body 2, for example, in paving work on a narrow road, the operator uses the lifting step 3l as a scaffold. The elevating operation can be assured from the front and rear directions of the front vehicle body 2.

In addition, the lower step 32, the stopping step 33, and the upper step 34 constituting the elevating step 31 are provided with see-through openings 32C, 33C, and 34C which are opened in the upper and lower directions, respectively. It is.

Therefore, even if asphalt falls on the lower scaffold 32, the suspended scaffold 33, and the upper scaffold 34, the asphalt can be discharged through the see-through openings 32C, 33C, 34C, and the operator lifts and lowers. It is possible to prevent slipping on the footrests 32, 33, 34. In addition, during the pavement work of the road surface, the operator has to check the opening openings 34C of the upper scaffold 34 and the opening openings 33C of the suspended scaffold 33 and the lower scaffold 32 from the bottom plate 8. The road surface can be seen through each viewing opening 32C. For this reason, the operator can carry out the pavement work on the road surface while checking the pavement state of the road surface from the driver's seat 14 side for a wide range. Next, Figs. 10 to 12 show a third embodiment according to the present invention, which is characterized in that a roller drive for driving a voltage roller is provided with detection means for detecting that the movable bottom plate is in an open position or a closed position. The apparatus is provided with a driving force reducing means for reducing the driving force of the voltage roller when the detecting means detects that the movable bottom plate is in the open position. In addition, in this embodiment, the same code | symbol is attached | subjected to the same component as 1st Embodiment mentioned above, and the description is abbreviate | omitted.

In the figure, 4l is a switch provided as a detection means for detecting that the bottom plate 8 is placed on the lower surface of the bottom portion 8B and detecting that the movable bottom plate 11 is in the open position or the closed position. It is located behind the notch part 10, and the inner month is attached to the L-shaped bracket 42 which is bolted to the lower surface side of the part 8B. In addition, when the movable bottom plate 11 is in the closed position shown by the solid line, the switch 41 is turned off on the lower surface side of the movable bottom plate 11, and the movable bottom plate 11 is shown in the open position shown by the dashed-dotted line. The L-shaped bracket 43 which turns on the switch 41 when it turns into is provided.

The switch 4l outputs a detection signal to the on / off valve 67 which is turned off by the bracket 43 when the movable bottom plate 11 is in the closed position. Moreover, 44 is a stopper installed in the bracket 42 located in the vicinity of the switch 41, and this stopper 44 fits to the bracket 43 when the movable base plate 11 is in the closed position. This protects the switch 4l.

12 shows a roller driving device for driving the front voltage roller 6 and the rear voltage roller 7, which are the hydraulic pump 51, the hydraulic motor 53, and the light actuator 61 which will be described later. ), The direction change valve 63, and the like.

5L is a variable displacement hydraulic pump driven by the prime mover 52. The hydraulic pump 51 has a capacitance variable portion 51A made of, for example, a slant plate, and the like. It is to change the discharge capacity.

53 is a traveling hydraulic motor for rotating the front voltage roller 6, the rear voltage roller 7, etc., the hydraulic motor 53 is connected to the hydraulic pump 51 by the main conduit 54, 55, The hydraulic pump 51 and the hydraulic motor 53 constitute a hydraulic closed circuit.

When the capacity variable portion 5lA of the hydraulic pump 51 is tilted in the direction of the arrow F from the neutral position shown in the figure, the hydraulic motor 53 rotates forward, and each of the voltage rollers 6, 7 rotates forward. When the capacity variable portion 51A is tilted in the direction of the arrow R, the hydraulic motor 53 is reversely rotated so that each of the voltage rollers 6 and 7 rotates to the retreat side.

56 is a charging pump driven by the prime mover 52 together with the hydraulic pump 5l. The charging pump 56 passes the operating oil in the tank 19 via the conduit 57 and the check valves 58 and 59. By supplying to the main conduits 54 and 55, the occurrence of cavitation (cavitation) in each of the main conduits 54 and 55 is prevented. The charging pump 56 constitutes a pilot hydraulic pressure source for supplying pilot pressure oil to the light electric actuator 61 described later. 60 is a relief valve which sets the maximum pressure of the hydraulic oil discharged from the charging pump 56.

61 is a light actuator, and this light actuator 61 rotates the hydraulic motor 53 forward or reverse by rotating the capacity variable part 5lA of the hydraulic pump 5l. The light actuator 6l includes a cylinder 61A, a piston 6lB slidably inserted into the cylinder 61A, and two oil chambers 61C, which are defined in the cylinder 6lA by the piston 6lB. 61D) and springs 6LE and 61F installed in the oil chambers 6lC and 6lD and forcing the piston 6lB toward the neutral position. The piston 6lB is connected to the displacement variable portion 51A of the hydraulic pump 5l via a link 62.

63 is a directional control valve which is operated by the forward and backward lever 17 installed on the steering wheel 15, and the directional control valve 63 is the oil chamber 61C of each of the light actuators 6l from the charging pump 56. By changing the direction of the pressure oil supplied and discharged to 61D), the rotation of the hydraulic motor 53 is reversed. Here, the direction switching valve 63 has a pump port connected to the charging pump 56 and a tank port connected to the tank 19. The directional valve 63 has one output port connected to the oil chamber 61C of the light transmissive actuator 61 via a conduit 64, and the other output port is connected to the light transmissive actuator 61 via a conduit 65. Is connected to an oil chamber 6D.

Then, the direction switching valve 63 is switched from the neutral position I to the forward side position II or the retreat side position III by operating the forward and backward lever 17. When the directional valve 63 is in the neutral position I, the capacity variable portion 5LA of the hydraulic pump 51 is in the neutral position and the hydraulic motor 53 stops.

When the directional valve 63 is switched to the forward side position II, the hydraulic oil from the charging pump 56 is supplied to the oil chamber 61C of the light electric actuator 61 so that the piston 6lB is left in the drawing. The variable displacement portion 5lA of the hydraulic pump 5l is swung in the direction of the arrow F through the link 62, and the hydraulic motor 53 is rotated forward so that the voltage rollers 6, 7 rotate forward. do.

On the other hand, when the directional valve 63 is switched to the retreat side position III, the hydraulic oil from the charging pump 56 is supplied to the oil chamber 61D of the light electric actuator 61 so that the piston 6lB is right in the drawing. The variable displacement portion 5lA of the hydraulic pump 5l is swung in the direction of the arrow R through the link 62, and the hydraulic motor 53 reversely rotates so that the voltage rollers 6, 7 move backward. It is a rotating structure.

66 is a bypass pipe line. The bypass pipe line 66 is connected between the directional valve 63 and the pipe lines 64 and 65 between the oil chambers 61C and 6lD of the light actuator. . The bypass pipe 66 constitutes a driving force reduction means for reducing the driving force of the front voltage roller 6 and the rear voltage roller 7 like the opening / closing valve 67 described later.

67 is provided in the middle of the bypass line 66, and is an on-off valve for opening and closing the bypass line 66 in accordance with a detection signal from the switch 4l. The on-off valve 67 is a two-port two-position solenoid valve. It consists of a solenoid part 67A and a spring 67B.

When the movable bottom plate 11 is in the open position and the switch 41 is turned on, the on-off valve 67 maintains the open valve position a by the spring 67B to open the bypass pipe 66. Open to communicate between pipes (64, 65). On the other hand, when the movable sole plate 11 is in the closed position and the switch 41 is turned off, the on-off valve 67 is closed to the closed valve position b by a signal output from the switch 4l to the solenoid portion 67A. The switch is configured to close the bypass pipe 66 and cut off the pipes 64 and 65.

The load roller according to the present embodiment has the above configuration, and there is no particular difference in the basic operation of stepping on asphalt or the like laid on the road surface during pavement work of the road surface.

In addition, the load roller according to the present embodiment is improved so that an operator can get on and off the driver's seat 14 quickly and safely, and the lifting operation of the operator will be described below.

First, when getting on the driver's seat 14, the operator grasps the vertical lowering part 24C of the front railing 24 and the vertical lowering part 27D of the rear railing 27, and the lower footrest of the step 20 for elevating. (2l), the suspended scaffold 22, and the upper scaffold 23 are stepped out sequentially. In addition, the operator rotates the movable bottom plate 11 to the open position, for example, when it reaches the stop pedal 22, to open the notch part 10 of the bottom plate 8, and the notch part from the upper plate 23. By extending the bottom plate 8 through 10, the inner month of the bottom plate 8 can be quickly climbed onto the driver's seat 14 without the foot, body, etc. being caught by the part 8B.

Here, when the movable bottom plate 11 is in the open position, the switch 41 is turned on so that the opening / closing valve 67 maintains the open valve position (a). ), And the inside of the oil chambers 61C, 61D of the light actuator 61 becomes substantially equal pressure. Accordingly, the piston 61B of the light actuator 6l is moved to the neutral position by the springs 61E and 61F, and the discharge amount of the hydraulic pump 51 is reduced, so that the front voltage roller 6 by the hydraulic motor 53 is reduced. The driving force of the rear voltage roller 7 is reduced.

For this reason, for example, even if the operator who gets on the driver's seat 14 inadvertently touches the forward and backward lever 17 and the direction switching valve 63 is switched to the forward side position II or the retracted position III, the light actuator Since 61 maintains the neutral position, the load roller can be prevented from rapidly starting and falling against the operator's idea, and the safety at the time of getting on the driver's seat 14 can be secured.

On the other hand, when the operator who gets on the driver's seat 14 carries out the paving work of stepping on the asphalt laid by the road roller, the operator first rotates the movable bottom plate 11 to the closed position, The notch 10 is closed by the movable bottom plate 11.

As a result, the switch 4l is turned off, the on-off valve 67 is switched to the closing valve position b, and the bypass pipe 66 is closed to cut off between the pipe lines 64 and 65. In this state, for example, when the operator tilts the forward / backward lever 17 forward to switch the direction change valve 63 to the forward side position II, the oil pressure from the charging pump 56 flows into the conduit 57, 64. ) Is supplied to the oil chamber (61C) of the light actuator (6l). Accordingly, the piston 61B slides to the left in the drawing, the capacity variable portion 5lA of the hydraulic pump 51 is tilted in the direction of the arrow F via the link 62, and the hydraulic motor 53 is rotated forward. The road roller runs forward.

In addition, when the operator tilts the forward and backward lever 17 backward, and the direction change valve 63 is switched to the retracted position (III), the hydraulic oil from the charging pump 56 is transmitted through the pipelines 57 and 65. The oil chamber 6lD of the actuator 6l is supplied. As a result, the piston 61B slides to the right in the drawing, through the link 62, the displacement variable 51A of the hydraulic pump 51 is warped in the direction of the arrow R, and the hydraulic motor 53 is rotated in reverse. The road roller retreats.

In this way, by operating the steering apparatus 16 while driving the load roller forward or backward, the pavement work of stepping on the asphalt laid on the road surface by the front voltage roller 6 and the rear voltage roller 7 can be performed.

Next, when getting off from the driver's seat 14, the operator returns the forward and backward lever 17 to the neutral position to stop the load roller, and then operates the gate lock lever 13 of the movable bottom plate 11 to operate the movable bottom plate ( 11) is rotated to the open position to open the notch 10 of the bottom plate (8). And the operator grasps the bottom plate 8, the upper step 23 of the lifting step 20, while holding the vertical lowering portion 24C of the front railing 24 and the vertical lowering portion 27D of the rear railing 27, The road surface can be reached quickly by stepping out the stepped footrest 22 and the bottom footrest 21 in sequence.

In this case, in the state where the movable bottom plate 11 is in the open position, the switch 41 is turned on, and the on-off valve 67 maintains the open valve position a. For this reason, as described above, even if the operator descending from the driver's seat 14 touches the forward / backward lever 17 and the direction change valve 63 is switched to the forward side position II or the retreat side position III, the hydraulic pressure is reduced. Since the driving force of the front voltage roller 6 and the rear voltage roller 7 by the motor 53 is reduced and the load roller can be prevented from suddenly starting and running, the safety when getting off from the driver's seat 14 can be secured. Can be.

Next, FIG. 13 shows a modification of the above-described third embodiment. In this modification, the driving force reduction means is constituted by an on-off valve provided in the middle of a pipe connecting the light actuator and the pilot hydraulic source.

In the figure, 71 is an on / off valve serving as a driving force reducing means provided in the middle of the pipeline 57 located between the charging pump 56 and the direction switching valve 63 (upstream of the direction switching valve 63). The valve 71 consists of a solenoid valve of a three-port two-position, and has a solenoid portion 71A and a spring 71B.

When the movable bottom plate 11 is in the open position and the switch 4l is turned on, the shutoff valve 71 maintains the closed valve position c by the spring 71B so that the direction switching valve 63 is closed. When it is switched to the forward side position (II) or the retreat side position (III), the pressure oil in the oil chamber 6LC or 61D of the light transverse actuator 61 is discharged to the tank 19. On the other hand, the open / close valve 71 has the open valve position d by the signal output from the switch 41 to the solenoid portion 7LA when the movable bottom plate 11 is in the closed position and the switch 41 is turned off. Pressure is supplied from the charging pump 56 to the oil chamber 61C or 6lD of the light electric actuator 6l when the directional valve 63 is switched to the forward side position II or the retreat side position III by switching to. It is configured to let.

This modification has the above-described configuration. When the operator rotates the movable bottom plate 11 to the open position when the driver 14 is lifted up or down from the driver's seat 14, the switch 41 is turned on and opened and closed. The valve 71 maintains the closed valve position c.

For this reason, for example, even if the operator lifting and lowering the driver's seat 14 touches the forward / backward lever 17 and the direction switching valve 63 is switched to the forward side position II or the retracted position III, the light actuator 44 Piston 61B moves to the neutral position by the springs 6lE and 6lF, and the discharge amount of the hydraulic pump 5l is reduced so that the front voltage roller 6 and the rear voltage roller 7 by the hydraulic motor 53 are reduced. Driving power of the vehicle is reduced. As a result, contrary to the operator's idea, the load roller can be suppressed from suddenly starting and the safety at the time of lifting can be secured.

When the operator who rides on the driver's seat 14 rotates the movable bottom plate 11 to the closed position, the switch 41 is turned off, and the on-off valve 71 is switched to the open valve position d. In this state, when the operator switches the direction change valve 63 to the forward side position (II) or the retracted side position (III) by the forward and backward lever 17, the hydraulic oil from the charging pump 56 is transferred to the light transverse actuator 6l. Supplied to the oil chamber 6lC or the oil chamber 61D of the hydraulic pump 5l and the capacity variable portion 51A of the hydraulic pump 5l is tilted in the direction of the arrow (F) or the direction (R) so that the load roller can be driven forward or backward. Can be.

Next, Fig. 14 shows another modification of the above-described third embodiment, and in this modification, a parking brake that provides a brake force to the hydraulic motor is provided in the middle of a brake pipe that supplies the brake release pressure oil to the parking brake. The driving force reduction means is constituted by the on-off valve.

In the figure, 81 is a negative parking brake attached to the hydraulic motor 53. The parking brake 8l is slidably installed in the brake cylinder 8lA and the brake cylinder 8lA, and the brake cylinder 81A. A piston 81C defining the brake release chamber 81B, a friction plate 8lD that frictionally engages the output shaft of the hydraulic motor 53 by the piston 8lC, and the friction plate 81D. It consists of a brake spring 8LE which adds the piston 81C to pressurize to the output shaft of 53, etc.

The parking brake 81 applies a braking force to the hydraulic motor 53 by the brake spring 81E during parking. On the other hand, the parking brake 81 is brake spring 81E by supplying the brake release pressure oil from the charging pump 56 into the brake release chamber 81B via the brake pipeline 82 or the like when the hydraulic motor 53 is operated. ) To release the braking force for the hydraulic motor (53).

Numeral 82 denotes a brake line, which connects the brake release chamber 8LB of the parking brake 81 to the line 57 continuous to the charging pump 56. The brake conduit 82 supplies the hydraulic oil from the charging pump 56 to the brake releasing chamber 8LB as the brake releasing pressure.

83 is an on-off valve serving as a driving force reducing means provided in the middle of the brake duct 82. The on-off valve 83 is composed of a three-port two-position solenoid valve, and has a solenoid portion 83A and a spring 83B.

When the movable bottom plate 11 is in the open position and the switch 4l is turned on, the on-off valve 83 maintains the closed valve position e by the spring 83B in the brake release chamber 81B. The hydraulic oil is forced out of the tank 19 and the braking force is applied to the hydraulic motor 53 by the parking brake 8l. On the other hand, when the movable bottom plate 11 is in the closed position and the switch 4l is turned off, the brake valve is switched to the open valve position f by a signal output from the switch 41 to the solenoid portion 83A. The hydraulic oil from the charging pump 56 is supplied to the brake release chamber 81B via 82.

This modification has the above-described configuration. When the movable bottom plate 11 is rotated to the open position when the operator moves up and down, the switch 41 is turned on so that the on-off valve 83 maintains the closed valve position e. The parking brake 81 gives the hydraulic motor 53 a braking force by causing the oil pressure in the brake releasing chamber 81B to exit the tank 19.

For this reason, for example, when getting on and off the driver's seat 14, the operator touches the forward and backward lever 17 so that the direction switching valve 63 is switched to the forward side position II or the retracted position III and the hydraulic pump ( Even though the hydraulic oil from 5l) is rapidly delivered to the hydraulic motor 53, the hydraulic motor 53 is applied by the parking brake 8l, so the front voltage roller 6 and the rear voltage roller by the hydraulic motor 53 are braked. The driving force of (7) is reduced. As a result, contrary to the operator's idea, the load roller can be suppressed from suddenly starting and the safety when the operator moves up and down can be secured.

When the operator who rides on the driver's seat 14 rotates the movable bottom plate 11 to the closed position, the switch 41 is turned off, and the on-off valve 83 is switched to the open valve position f to charge pump 56. The hydraulic oil from is supplied into the brake releasing chamber 81B via the brake duct 82 to release the braking force for the hydraulic motor 53.

In this state, when the operator switches the direction change valve 63 to the forward side position II or the retracted position III by the forward and backward lever 17, the oil pressure from the charging pump 56 is transferred to the light warn actuator 6l. Supplied to the oil chamber 6lC or the oil chamber 6lD, and the capacity variable portion 5lA of the hydraulic pump 51 is tilted in the direction of the arrow (F) or (R), thereby causing the load roller to run forward or backward. Can be.

Next, Fig. 15 shows a modification of the lifting step, and the lifting step 91 according to the present modification also includes a lower footrest 92, an interrupted footrest 93, and an upper footrest 94.

Here, the lower footrest 92 is composed of a frame body 92A and a spacer plate 92B, and protrudes from the side surface 19E of the tank 19 with a protruding length A11. On the other hand, the length Bll in the front and rear directions of the lower footrest 92 is set to be substantially the same as the length in the front and rear directions of the tank 19, so that the front end 92Al of the frame body 92A is formed of the tank 19. It is in the same position as the front face 19C and the rear end 92A2 is in the same position as the rear face 19D of the tank 19.

In addition, the stopping step 93 is composed of a frame body 93A and a spacer plate 93B, and protrudes from the side surface 19E of the tank 19 with a protruding length A12 smaller than the above protruding length A11. have. On the other hand, the length B12 in the front and rear directions of the suspended scaffold 93 is set smaller than the length Bl1, so that the front end portion 93Al of the frame body 93A is the same as the front surface l9C of the tank 19. In the position, the rear end 93A2 is shifted forward by the length D12 from the rear surface 19D of the tank 19.

In addition, the upper foot plate 94 is composed of a frame body 94A and a spacer plate 94B, and protrudes from the side surface 19E of the tank l9 with a protruding length Al3 smaller than the above-described protruding length A12. have. On the other hand, the length B13 in the front and rear directions of the upper footrest 94 is set smaller than the length B12 described above, so that the front end portion 94A1 of the frame body 94A is the same as the front surface 19C of the tank 19. In the position, the rear end portion 94A2 is shifted forward from the rear surface 19D of the tank 19 by a length D13 larger than the length Dl2 described above.

In this way, each footrest 92, 93, 94 which comprises the step 91 for elevating steps becomes smaller from the lower end side toward the upper end side, and the projection length from the side surface l9E of the tank 19 is gradually reduced, and the lower end side It is comprised in the staircase shape which shifts the position of a rear end toward an upper end side toward an upper end sequentially.

Next, FIG. 16 shows another modified example of the elevating step, and the elevating step 95 according to the present modified example is also composed of the lower footrest 96, the suspended footrest 97, and the upper footrest 98.

Here, the lower foot plate 96 is composed of a frame body 96A and a spacer plate 96B, and protrudes from the side surface 19E of the tank 19 with a protruding length A21. On the other hand, the length B2l in the front and rear directions of the lower scaffold 96 is set smaller than the length in the front and rear directions of the tank 19, and the front end 96Al of the frame body 96A is the front surface of the tank 19. The rear end portion 96A2 is located at the same position as the rear surface 19D of the tank 19 by shifting backward from the 19C by the length C2l.

The stop scaffold 97 is composed of a frame body 97A and a spacer plate 97B, and protrudes from the side surface l9E of the tank l9 with a protruding length A22 smaller than the above protruding length A21. have. On the other hand, the length B22 in the front and rear directions of the suspended scaffold 97 is set equal to the length B2l described above, so that the front end portion 97Al of the frame body 97A has a length from the front surface 19C of the tank 19. The rear end portion 97A2 is shifted forward by the length D22 from the rear surface 19D of the tank 19.

In addition, the upper footrest 98 is composed of a frame body 98A and a spacer plate 98B, and protrudes from the side surface l9E of the tank 19 with a protruding length A23 smaller than the above-described protruding length A22. have. On the other hand, the length B23 in the front and rear directions of the upper scaffold 98 is set equal to the length B21 described above, and the front end portion 98A1 of the frame body 98A is formed at the front surface l9C of the tank 19. At the same position, the rear end portion 98A2 is shifted forward from the rear surface 19D of the tank 19 by a length D23 larger than the length D22 described above.

In this way, each of the steps 96, 97, and 98 constituting the step 95 for elevating is gradually smaller in the protruding length from the side surface 19E of the tank 19 from the lower end side toward the upper end side, and at the lower end side. It is comprised in the staircase shape which shifts the position of a rear end toward an upper end side toward an upper end sequentially.

In addition, in the above-described embodiment, the load roller in which the front vehicle body 2 provided with the front voltage roller 6 and the rear vehicle body 4 provided with the rear voltage roller 7 are swingably connected via the connecting device 3 or the like. For example, but the present invention is not limited to this, for example, the front voltage roller 6 and the rear voltage roller 7 can be applied to a load roller provided as a single vehicle body.

Moreover, in the said 1st Embodiment, the case where each footrest 2l, 22, 23 which comprises the step 20 for elevating is provided to the side surface 2B of the front vehicle body 2 via the tank 19 was mentioned as an example. . However, the present invention is not limited thereto, and for example, the footrests 21, 22, and 23 may be directly fixed to the side surfaces 2B of the front vehicle body 2, for example. This also applies to the respective scaffolds 32, 33, 34 constituting the lifting step 31 of the second embodiment.

In addition, in the above-described first embodiment, the elevating step 20 is constituted by three steps of footrests (lower footrest 2l, middle footrest 22, upper footrest 23), but the present invention is not limited thereto. For example, you may comprise with two or four steps or more. The same applies to the step 31 for lifting up and down in the second embodiment.

Moreover, in said 1st Embodiment, each scaffold 21, 22, 23 of the elevating step 20 is comprised by frame bodies 21A, 22A, 23A and the space plates 2lB, 22B, 23B, respectively, respectively. The case where the perforation openings 2lC, 22C, and 23C which are opened up and down in (2l, 22, 23) is formed as an example. However, this invention is not limited to this, For example, each scaffold may be comprised by the steel plate which provided the opening for see-through by press processing etc. like a punching board. The same applies to the step 31 for lifting up and down in the second embodiment.

In each of the embodiments described above, a case in which the movable bottom plate 11 for opening and closing the notch portion 10 provided on the bottom plate 8 is rotatably installed on the bottom plate 8 via the hinge member 12 is described. Although mentioned as an example, this invention is not limited to this, For example, you may set it as the structure which provides the movable base plate which slides along a bottom plate 8 in a horizontal direction. Moreover, in each embodiment mentioned above, the case where the front railing 24 is provided in front of the elevating step 20 (31), and the rear railing 27 is provided in the back of the elevating step 20 (3l) is shown. Although mentioned as an example, this invention is not limited to this, For example, you may be set as the structure which only one of the front handrail 24 and the back handrail 27 is provided.

In the above-described third embodiment, the pipes 64 and 65 are connected between the direction switching valve 63 and each of the oil chambers 6 lC and 6 lD of the light electric actuator 61 by pipe lines 64 and 65. The case where the bypass pipe 66 is installed between them is taken as an example. However, the present invention is not limited to this, but the connection positions of the bypass pipes 66 are as close as possible to the respective oil chambers 6lC and 6lD of the light electric actuator 6l. It may be configured to directly connect the 61C and 6LD.

As described in detail above, according to the present invention, the elevating step is constituted by a plurality of steps provided to protrude from the side of the vehicle body to the left and right directions. Since the projecting length from the side of the vehicle body becomes larger and becomes stepwise toward the top side, the operator can use the stepping edge protruding further from the protruding end portion of the upper side scaffold to the left and right direction as a stepping margin. I can see it with eyes. For this reason, when an operator gets on the driver's seat of a road roller, an operator can hold | maintain the step of each step reliably, without being tripped over to the top side. Moreover, when getting out of the driver's seat, the operator can securely step on the steps of each stage without losing the bottom.

In addition, according to the present invention, since the steps of the rear end are sequentially stepped from the lower side toward the upper side, the rear end of the lower side of the footing as a stepping margin protrudes further forward from the rear end of the upper side of the footing. I can see it with eyes. For this reason, when getting on and off the driver's seat using the lifting step as a scaffold, the operator can surely step on the steps of each step while visually seeing the scaffold to be stepped on next. For example, even when it is difficult to secure enough space for lifting in the left and right directions of the vehicle body during pavement work on a narrow roadway, the operator may use the lifting step as a stepping step from the front and rear directions of the vehicle body. Can get in and out of the driver's seat.

Claims (19)

A load roller comprising a vehicle body in which front and rear voltage rollers are rotatably installed, a driver's seat positioned on a bottom plate of the vehicle body, and an elevating step provided on the side of the vehicle body to ascend and lower the driver's seat. The step for raising and lowering is constituted by a plurality of stools provided protruding from the side of the vehicle body in the left and right directions, each of which has a large protruding length from the side of the vehicle body of the lower stool, toward the upper side. A load roller comprising a step shape in which the protruding length from the side surface of the vehicle body is gradually reduced. The method of claim 1, The vehicle body comprises a front vehicle body in which a front voltage roller is rotatably installed, and a rear vehicle body connected to the front vehicle body in which a rear voltage roller is rotatably installed, and the elevating step is installed in the front vehicle body. A load roller comprising a configuration. The method of claim 1, Each said scaffolding is a rod roller, characterized in that the position of the rear end toward the top side from the bottom side is made of a staircase shape shifted forward. The method according to any one of claims 1 to 3, The foot roller of each step which comprises the said step for elevating is provided with the structure provided with the aperture opening for seeing the road surface from the bottom plate of the said vehicle body, The load roller characterized by the above-mentioned. The method according to any one of claims 1 to 3, A fuel tank or an operating oil tank is installed on the side of the vehicle body, and a plurality of steps of scaffolds located at least at the lower end of the steps of each step constituting the lifting step are fixed to the side of the tank. A load roller, characterized in that made. The method according to any one of claims 1 to 3, The driver's seat is spaced apart in the left and right directions on the bottom plate of the vehicle body, and two are installed, and the elevating step is configured to be installed on the left and right sides of the vehicle body, respectively. The method according to any one of claims 1 to 3, The vehicle body is provided with handrails extending on the one side or both sides of the elevating step and extending in the up and down directions, and the lower end side of the handrail has a configuration extending downward from the bottom plate of the vehicle body. A road roller, characterized in that. The method of claim 1, The vehicle body comprises a front vehicle body in which a front voltage roller is rotatably installed, and a rear vehicle body connected to the front part vehicle body in which a rear voltage roller is rotatably installed, and the front vehicle body has the lifting step therebetween. Before and after installation, the rails are installed on both sides of the vehicle, and the rails extending upward and downward, and the rails of the front side extends below the bottom plate of the front body between the front voltage roller and the lifting step, The rear railing is a load roller comprising a configuration that extends below the bottom plate of the front vehicle body between the connecting portion of the front vehicle body and the rear vehicle body and the lifting step. The method according to any one of claims 1 to 3, The notch part is provided in a part corresponding to the step for lifting in the bottom plate of the vehicle body, and the movable plate is provided in the bottom plate which is moved between an open position of opening the notch part and a closed position of closing. Featuring a road roller. The method according to any one of claims 1 to 3, On the bottom plate of the vehicle body, at least the inner end portion of the inner side of the vehicle body is provided at least on the side where the elevating step is installed, and the inner side portion is provided with a notch portion at a position corresponding to the elevating step. And the plate is provided with a movable bottom plate which is movable between an open position of opening the notch and a closed position of closing. The method according to any one of claims 1 to 3, The notch part is provided in a part corresponding to the step for lifting in the bottom plate of the vehicle body, and the movable plate is provided with a movable bottom plate moving between an open position of closing the notch part and a closed position of closing. A rod roller, characterized in that the plate is provided with a configuration for installing the operation member for opening and closing the movable bottom plate. The method of claim 11, The operation member allows the lifting and lowering between the bottom plate and the lifting step when the movable bottom plate is in the open position, and prohibits the lifting between the bottom plate and the lifting step when the movable bottom plate is in the closed position. The road roller is a gate lock lever. The method according to any one of claims 1 to 3, The vehicle body is provided with handrails extending in the up and down directions on one side or both sides of the rear direction, with the lifting step sandwiched therebetween, and the lower end side of the handrail extending below the bottom plate of the body. The notch part is provided in a portion corresponding to the step for lifting in the bottom plate of the vehicle body, and the movable plate is installed in the bottom plate between the open position of opening the notch and the closed position of closing. And a movable member provided with an operation member for opening and closing the movable bottom plate. The method of claim 9, The vehicle body is provided with detection means for detecting that the movable bottom plate is in the open position or the closed position, and when the roller driving device for driving the voltage roller detects that the movable bottom plate is in the open position by the detection means. And a driving force reducing means for reducing the driving force of the voltage roller. The method of claim 14, The roller driving apparatus includes a variable displacement hydraulic pump driven by a prime mover and having a variable capacity portion, a hydraulic motor for rotating the voltage roller by a pressurized oil discharged from the hydraulic pump, and two oil chambers in the cylinder. A light pressure actuator installed in the middle of a light pipe actuator for rotating the hydraulic motor forward or reverse by rotating the capacity variable portion of the hydraulic pump according to the displacement of the piston, and a pipe connecting the light hydraulic actuator to the pilot hydraulic source. It consists of a direction switching valve for switching the hydraulic motor forward, reverse rotation by switching the direction of significance, The driving force reducing means is provided between two pipelines connecting between the directional valve and each oil chamber of the light actuator, or between the oil chambers of the light actuator and a bypass pipe provided in the middle of the bypass pipe. And when the detecting means detects that the movable bottom plate is in the open position, the bypass pipe is opened, and when it is detected that the movable bottom plate is in the closed position, an on / off valve is configured to close the bypass pipe. Load roller. The method of claim 14, The roller driving device is a variable displacement hydraulic pump driven by a prime mover having a variable capacity portion, a hydraulic motor for rotating the voltage roller by the hydraulic oil delivered from the hydraulic pump, and the hydraulic pressure in accordance with the hydraulic oil supplied from the outside. The hydraulic actuator is installed in the middle of a pipeline connecting the hydraulic actuator to the hydraulic actuator by forward and reverse rotation of the hydraulic motor by rotating the capacity variable portion of the pump, and the hydraulic oil is switched by changing the direction of the hydraulic oil supplied to the hydraulic actuator. Consists of a directional valve for switching the rotation of the motor forward and reverse, The driving force reducing means is located upstream from the direction switching valve and is installed in the middle of the pipeline, and when the detecting means detects that the movable bottom plate is in the open position, the pressure oil in the light actuator is turned off to the closed position. And a closing valve for supplying the pressurized oil to the light actuator when it is detected. The method of claim 14, The roller driving device is driven by a prime mover, a variable displacement hydraulic pump having a variable capacity portion, a hydraulic motor for rotating the voltage roller by the hydraulic oil delivered from the hydraulic pump, and a braking force to the hydraulic motor when parking. It is composed of a parking brake for releasing the braking force during operation of the hydraulic motor, The driving force reducing means is installed in the middle of a brake pipe that supplies the brake release pressure oil to the parking brake, and when the detecting means detects that the movable bottom plate is in the open position, the pressure oil in the parking brake is pulled out, and the closing position is removed. And an on / off valve for supplying pressurized oil to the parking brake when it is detected. A load roller comprising a vehicle body in which front and rear voltage rollers are rotatably installed, a driver's seat positioned on a bottom plate of the vehicle body, and an elevating step provided on the side of the vehicle body to ascend and lower the driver's seat. The vehicle body is provided with handrails extending on the one side or both sides of the elevating step and extending upward and downward, and the lower end side of the handrail extends to the lower side than the bottom plate of the vehicle body. A road roller, characterized in that. A load roller comprising a vehicle body in which front and rear voltage rollers are rotatably installed, a driver's seat positioned on a bottom plate of the vehicle body, and an elevating step provided on the side of the vehicle body to ascend and lower the driver's seat. In the bottom plate of the vehicle body, a notch part is provided in a portion corresponding to the step for lifting, and the bottom plate is provided with a movable bottom plate moving between an open position of opening the notch part and a closed position of closing. A load roller, characterized in that the plate is provided with an operation member for opening and closing the movable bottom plate.