WO2000014336A1

WO2000014336A1 - Road roller

Info

Publication number: WO2000014336A1
Application number: PCT/JP1999/004833
Authority: WO
Inventors: Seiji Tamura; Morio Oshina; Kiyoshi Hirasawa; Tsuyoshi Takayama
Original assignee: Hitachi Construction Machinery Co., Ltd.
Priority date: 1998-09-09
Filing date: 1999-09-07
Publication date: 2000-03-16
Also published as: KR20010031888A; EP1046748B1; DE69935311D1; EP1046748A4; KR100375791B1; CN1246533C; DE69935311T2; EP1046748A1; CN1277647A

Abstract

A road roller which enables an operator to quickly and safely get on and off the driver's seat. A flight of steps (20) for getting on and off installed on a lateral surface (2B) of a front car body (2) is composed of a lower step board (21), an intermediate step board (22) and an upper step board (23), these step boards (21, 22, 23) being arranged like stairs such that their lengths projecting beyond the lateral surface (2B) of the front car body (2) are progressively reduced upward. Thereby, the operator can visually observe the projecting end of the lower step board (21) as a stepping area further projecting beyond the projecting end of the intermediate step board (22) and the projecting end of the intermediate step board (22) as a stepping area further projecting beyond the projecting end of the upper step board (23). Therefore, the operator can reliably step forward while visually observing the step boards (21, 22, 23) when getting on and off the driver's seat; thus, the operation of getting on and off can be quickly and safely performed.

Description

Roller Technical field

The present invention relates to a mouth-roller suitably used for pavement work for compacting a pavement material such as gravel or asphalt spread on a road surface or the like. Background art

Generally, when performing paving work on a road surface, etc., a mouth drawer called a drum roller, tire roller, macadam roller, or the like is used. After laying, a method is used in which the pavement material is compacted by running a load roller.

Therefore, this type of conventional load roller will be described with reference to FIGS. 17 and 19. FIG.

In the figure, 101 is a vehicle body of a roller, and the vehicle body 101 is a front vehicle body 102 and a rear vehicle body connected to the front vehicle body 102 via a connecting device 103. 104. Then, between the front vehicle body 102 and the rear vehicle body 104, the rear vehicle body 104 is moved leftward with respect to the front vehicle body 102, centering on the connecting device 103. A steering cylinder 105 that swings rightward is provided.

Here, the front body 102 is formed in a box shape surrounded by a top surface 102A, left and right side surfaces 102B, 102B, and a floor plate 108 described later. The engine and hydraulic pumps (both not shown) are housed inside. 106, 106 are a pair of front-side compaction rollers rotatably mounted on the front body 102, separated from each other in the left and right directions. Each front-side compaction roller 106 is made of, for example, metal. The weight of the drum can be adjusted by filling it with water or the like. Further, a hydraulic motor (not shown) for rotating the front-side rolling roller 106 is provided between the front vehicle body 102 and each of the front-side rolling rollers 106.

Reference numeral 107 denotes one rear pressure roller rotatably provided on the rear body 104, and the rear pressure roller 107 has a larger axial direction than the front pressure roller 106. It is made of a metal drum having dimensions and, like the front-side pressure roller 106, has a configuration in which the weight can be adjusted by sealing water or the like inside. Further, a hydraulic motor (not shown) for rotating the rear-side pressure roller 107 is provided between the rear vehicle body 104 and the rear-side pressure roller 107.

Reference numeral 108 designates a floor plate disposed on the rear side of the upper surface 102A so as to be substantially the same as the upper surface 102A of the front body 102, and the floor plate 108 is rectangular. It is made of steel plate and constitutes the-part of the front body 102. Here, as shown in FIG. 18, the floor panel 108 includes a central floor portion 108 A located between the side surfaces 102 B of the front vehicle body 102 and a front vehicle body 108. It consists of left and right overhangs, 108B and 108B, which protrude from the sides 102B of each of the 2 in eaves. On the rear side of the floor panel 108, a support base 109 for supporting each driver's seat 110 described later is provided extending in the left and right directions.

1 110 and 110 are two driver's seats arranged on the support stand 109 apart from each other in the left and right directions, and a cockpit 1 1 1 is located in front of each driver's seat 110. It is provided to extend to the left and right directions, and the cockpit 1 1 1 is controlled to a position corresponding to each driver's seat 110. Steering devices 111, 112, etc. for the rudder are provided. Then, by steering one of the steering devices 112, one of the steering devices 112, the above-described steering cylinder 105 expands and contracts, and the coupling device 105 expands and contracts. The rear body 104 swings left and right with respect to the front body 102 around the center 103, and the traveling direction of the load roller is controlled.

1 13, 1 13 are forward and backward levers provided on the control stand 111 near the left and right steering devices 1 1 2, respectively. The vehicle body 101 is configured to move forward or backward by tilting one of the forward and reverse levers 113 on one side to the forward or backward side. In addition, the upper side of each driver's seat 110 is covered with canon 114.

Steps 1 15 and 1 15 are steps for forming a scaffold when the operator gets on and off the driver's seat 110, and each step 115 is a front vehicle body. It is provided on the left and right side surfaces 102B, respectively. Then, as shown in FIG. 19, each step for getting in and out of the board 1 15 is attached to an outer plate that is mounted to project from the side surface 102 B of the front vehicle body 102 in the left and right directions. A plurality of (for example, four) treads 1 17, 1 17,... Provided in multiple stages in 1 16 form a vertical ladder shape. Here, each tread plate 117 is made of, for example, a steel plate bent in a U-shape, and the protruding length S of each tread plate 117 from the side surface 102B of the front vehicle body 102 is formed. Are set equal o

Reference numerals 118 and 118 denote left and right front handrails erected at the front corners of the floorboard 108, and the front handrails 118 are steps for getting on and off. Steering on the front side It is arranged so as to surround the device 1 1 2. 1 19 and 1 19 are left and right rear handrails erected at the rear corners of the floorboard 108, and each rear handrail 1 19 is a step-on / off step 1 It is located behind the driver's seat 15 and surrounds the driver's seat 110. Each of the handrails 118 and 119 is gripped by an operator who gets on and off the driver's seat 110 using the getting on / off step 115 as a foothold. This is to ensure safety when getting on and off the 110.

The mouth roller according to the prior art has the above-described configuration. When pavement work is performed on a road surface using this mouth roller, first, an operator operates a handrail. While holding 9, step into the driver's seat 110 on the floorboard 108 using the step for getting on and off 1115 as a foothold.

Then, the operator seated in the driver's seat 110 operated the steering device 112, the forward / reverse lever 113, etc., and moved the load roller forward or backward, and was laid on the road surface. The surface of the pavement material is compacted by the front-side rolling roller 106 and the rear-side rolling roller 107 to perform pavement work on the road surface.

However, according to the above-described conventional load roller, when the operator gets on and off the driver's seat 110 using the getting on / off step 115 provided on the front vehicle body 102 as a foothold, the following steps are taken. There was a problem such as

First, when getting on and off the driver's seat 110 with the step-on / off step 1 15 as a foothold, the operator faces the side 10 2 B of the front body 10 2 while holding the handrail. As a result, the user steps on the treads 1 17 of the step 1 15 for getting on and off while supporting the body by gripping the fingers 118 and 119. In this case, the step 1 15 for getting on and off is configured as a vertical ladder, It is difficult to see each of the treads 1 1 7 overnight.

There is a risk of stepping over Step 7.

Further, since each of the treads 117 constituting the getting on / off steps 115 is made of an opaque steel plate bent in a U-shape, for example, the operator sitting in the driver's seat 110 However, there is a problem in that when the user tries to check the pavement state of the road surface by looking down from above the floor board 108, the visibility is obstructed by the tread board 117.

Also, since each tread plate 117 is made of steel plate, when the operator gets into the driver's seat 110, the pavement material attached to shoes or the like falls on the upper surface of the tread plate 117, and the tread plate 117 becomes There is a problem that it becomes slippery.

In addition, since the handrails 118 and 119 extend upward from the upper surface of the floorboard 108, the height from the ground to the lower end of the handrail 118 is large, and the operator must lift his arm. The handrail must be stretched upward to grip the handrails, and there is a problem that it is easy to be fatigued.

In addition, for example, when the operator slips on the lower step board 117 of the getting on / off step 115 at night, at the time of rainfall, or at the time of snowfall, the operator immediately puts it on the floor board 108. Railing 1 1 8, 1

It is difficult for the operator to grip 19, and the operator may fall down from the step 1 15 for getting on and off.

In addition, an eaves-like shape is placed on the upper side of the step-on / off step 115 provided on the side surface 102B of the front vehicle body 102 from the side surface 102B of the front vehicle body 102. Overhanging part of overhanging floorboard 108

108 B is present. For this reason, the operator moves from the top stepboard 1 17 of the boarding steps 1 15 to the floor board 1

When stepping to 08, the operator's feet, body, etc.

There is a risk of getting caught in the overhang part 108 B of the driver's seat. There is a problem that quick getting on and off to 110 is prevented. Furthermore, if the operator accidentally touches the forward / reverse lever 1 13 when getting on or off the driver's seat 110, and the forward / backward lever 1 13 tilts forward or backward. However, there is a problem that the vehicle body 101 travels forward or backwards contrary to the intention of Operet, and the safety at the time of getting on and off the driver's seat 110 is impaired. Disclosure of the invention

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art, and the present invention enables an operator to quickly and safely perform getting on and off operations when getting on and off a driver's seat. It is intended to provide a load roller.

Another object of the present invention is to provide a load roller capable of expanding a field of view below a floor plate when an operator gets on and off the vehicle.

Still another object of the present invention is to provide a load roller that can prevent a vehicle body from running carelessly when an operator gets on and off the vehicle.

In order to solve the above-described problems, the present invention provides a vehicle body provided with rotatable front and rear compaction rollers, a driver seat provided on a floor plate of the vehicle body, and getting on and off the driver seat Therefore, the present invention is applied to a mouth roller including a step for getting on and off the vehicle provided on a side surface of the vehicle body.

A feature of the present invention is that the step for getting on and off is constituted by a plurality of steps provided so as to protrude leftward and rightward from a side surface of the vehicle body. The length of the tread of the tread plate from the side surface of the vehicle body is large, and the length of the tread plate from the side surface of the vehicle body is gradually reduced toward the upper side. It has been configured.

With this configuration, the protruding end of the lower tread becomes a step allowance that further protrudes left and right from the protruding end of the upper tread. When the driver gets into the driver's seat, the operator can step on the treads of each step without stumbling over the treads on the upper side. Also, when the operator gets off the driver's seat, the operator can surely step forward while visually checking the tread of each step without stepping off the tread of the lower step.

In this case, the present invention provides a vehicle body comprising: a front body provided with a front rolling roller rotatably; and a rear body connected to the front body and provided with a rear rolling roller rotatably. The vehicle body may be configured so that the step for getting on and off is provided on the front vehicle body.

Also, the present invention provides each step board constituting the step for getting on and off.

However, it is possible to form a staircase shape in which the position of the rear end portion is sequentially shifted forward from the lower side toward the upper side.

As a result, the protruding end of the lower tread becomes a step allowance protruding further left and right from the protruding end of the upper tread, and the rear end of the lower tread is The step margin protrudes further rearward from the rear end of the upper step board. Therefore, when the operator steps on and off using the stepping board as a foothold, the operator can surely step on the stepping board of each step while watching the next stepping step to be stepped on. In addition, even when it is difficult to secure enough space for getting on and off the vehicle on the left and right sides, for example, when paving on narrow roads, Operetiyu will use the step for getting on and off. It can be used as a scaffold to get on and off from the front and rear of the vehicle.

In addition, the present invention provides a step-by-step method that constitutes a step for getting on and off. The board may be provided with a see-through opening for seeing the road surface from above the floorboard of the vehicle body.

In this case, for example, during pavement work on a road surface, the operator can visually check the road surface from the upper side of the floor plate through the see-through opening provided in the tread plate, and can easily check the pavement state of the road surface. You can check. Also, even if the pavement material or the like attached to the shoes falls on the tread when the operator gets into the driver's seat, the pavement or the like can be discharged through the see-through opening of the tread, so that the operator can get on and off. The slip at the time can be suppressed.

Further, according to the present invention, a fuel tank or a hydraulic oil tank is provided on a side portion of the vehicle body, and at least a lower step side of each step board constituting a step for getting on and off is provided. It is possible to adopt a configuration in which a plurality of steps are fixedly provided on the side surface of the tank.

Accordingly, the leftward and rightward lengths of the multiple steps of the treads fixed to the side surface of the tank can be shortened by the amount by which the tank projects from the side surface of the vehicle body.

Further, the present invention may be configured such that two driver's seats are provided on the floor plate of the vehicle body at left and right directions apart from each other, and step-on / off steps are provided on the left and right side surfaces of the vehicle body, respectively. it can.

Thus, for example, when paving the left side of the road surface, the driving of the vehicle body is controlled by the left driver's seat, and when paving the right side of the road surface, the driving of the vehicle body is controlled by the right driver's seat. It is possible to get on and off using the step for getting on and off near the driver's seat to be used as a foothold.

Further, according to the present invention, the vehicle body is provided with a handrail which is located on one side or both sides in front of and behind the getting-on / off step and extends upward and downward. Than the floorboard of the body It can be configured to extend to the bottom.

In this case, when getting on and off the driver's seat using the step for getting on and off, the operator must securely grasp the handrail from the ground to the floor panel on which the driver's seat is provided, while holding the handrail. You can follow the steps. As a result, getting on and off the driver's seat can be performed safely, and the operator's fatigue when getting on and off can be reduced.

Further, the present invention comprises a front vehicle body in which a front rolling roller is rotatably provided on a vehicle body, and a rear vehicle body connected to the front vehicle body and in which a rear rolling roller is rotatably provided. The front body is provided with handrails that extend upward and downward on both sides in front of and behind the sandwiching step, and the handrail on the front side is connected to the front compaction roller and the handrail. The front handrail extends below the floor plate of the front vehicle between the steps, and the rear handrail moves between the connection between the front vehicle and the rear vehicle and the step for getting on and off. It can be configured to extend below the floorboard.

Thus, the operator can get on and off the vehicle using the step for getting on and off while holding the handrail provided on the front vehicle body. In this case, even if the operator falls off the step for getting on and off, the operator can prevent the operator from falling down to the front pressure roller side by grasping on the front handrail. By gripping the rear handrail, it is possible to prevent the vehicle from falling to the connection side between the front vehicle body and the rear vehicle body.

In addition, the present invention provides a notch in a portion of a floor plate of a vehicle body corresponding to a step for getting on and off, and the floor plate has an open position for opening the notch and a closed position for closing the cut portion. A movable floor plate that moves between them can be provided. Thus, when the user gets on and off the driver's seat, the notch can be opened by setting the movable floor plate to the open position. Therefore, when the operator steps on the floorboard from the getting-on / off step, the operator's feet, body, and the like can pass through the position of the notch. Therefore, it is possible to prevent the operator from catching a foot, a body, etc. on the floor plate when getting on and off, and to get on and off the driver's seat quickly and safely.

Further, according to the present invention, a projecting portion projecting from a side surface of the vehicle body is provided on a side where at least a step for getting on and off is provided on a floor plate of the vehicle body, and the projecting portion is provided. Is provided with a notch at a position corresponding to the step for getting on and off, and the floor plate is provided with a movable floor plate which moves between an open position for opening the notch portion and a closed position for closing the notch portion. It can be done.

Thereby, when getting on and off, it is possible to open the notch by setting the movable floor plate to the open position. Therefore, when the operet steps on the floorboard from the step for getting on and off, the feet, body, etc. of the operet can pass through the position of the notch, so that the getting on and off operation can be performed quickly. It can be carried out. Also, during paving work, the movable floorboard is closed and the notch is closed, so that a wide scaffold can be secured on the overhang. Workability can be improved.

In addition, the present invention provides a notch in a portion of a floor plate of a vehicle body corresponding to a step for getting on and off, and the floor plate has an open position for opening the notch and a closed position for closing the cut portion. A movable floor plate moving between the movable floor plates may be provided, and the movable floor plate may be provided with an operation member for opening and closing the movable floor plate.

Thereby, the movable floor plate can be easily opened and closed by grasping the operation member, and a hand or the like is provided between the notch portion and the movable floor plate. Pinching can be prevented.

In addition, the present invention allows the operating member to move on and off between the floor plate and the step for getting on and off when the movable floor plate is in the open position, and when the movable floor plate is in the closed position. Gate lock lever that prohibits getting in and out of the step for getting on and off.

As a result, when the movable floor plate is set to the closed position, the gate lock lever prohibits getting on and off between the floor plate and the step for getting on and off. In addition, it is possible to prohibit operators from getting on and off carelessly, and to ensure safety during paving work.

The present invention also provides a handrail which extends upward and downward on one side or both sides before and after the step for getting on and off the vehicle, and a lower end of the handrail is provided on the vehicle body. The lower part of the floor panel of the vehicle body is provided with a notch at the position corresponding to the step for getting on and off, and the floor panel is opened with the notch. A movable floor plate that moves between the movable floor plate and the movable floor plate may be provided, and an operation member that opens and closes the movable floor plate may be provided on the movable floor plate.

This allows the operator to step on the step for getting on and off while securely gripping the handrail when getting on and off using the step for getting on and off as a foothold. Moreover, by opening the notch with the movable floor plate as the open position, when the operator steps on the floor plate from the getting on / off step, the operator's feet, body, etc., are in the notch. O Pass through the driver's position to get into and out of the driver's seat quickly and safely o

Further, according to the present invention, the vehicle body is provided with a detecting means for detecting that the movable floor plate has reached the open position or the closed position, The roller driving device for driving the roller is provided with a driving force reducing means for reducing the driving force of the rolling roller opening when the movable means detects that the movable floor plate has reached the open position by the detecting means. Can be configured.

In this case, when the movable floor plate is in the open position, for example, when getting on or off the driver's seat, the driving force reducing means can reduce the driving force of the roller. Therefore, even if the operator inadvertently activates the compaction roller when getting on or off the driver's seat, it is possible to suppress the sudden start of the vehicle body against the operator's will. Therefore, safety at the time of getting on and off can be ensured.

Further, the present invention provides a roller driving device, comprising: a variable displacement hydraulic pump driven by a prime mover and having a variable displacement portion; and a pressure oil supplied and discharged from the hydraulic pump. By tilting the variable capacity part of the hydraulic pump according to the displacement of the hydraulic motor that rotates the porter and the piston that defines the interior of the cylinder into two oil chambers A tilting mechanism for rotating the hydraulic motor forward or backward, and a pipe provided between the tilting mechanism and a pilot hydraulic power source; A direction switching valve for switching the rotation of the hydraulic motor between forward and reverse by switching the direction of the pressure oil supplied and discharged during the operation. Between the two pipelines that connect between the oil chambers A bypass pipe connected between the oil chambers of the tilt actuator and a bypass pipe provided in the middle of the bypass pipe, and the movable floor plate is set to the open position by the detecting means. And the on-off valve that closes the bypass line when it is detected that the bypass line has been closed. With this configuration, when the movable floor plate is in the open position, the on-off valve opens the bypass passage, so that the oil chambers of the tilting actuator are approximately closed. As the pressure becomes equal, the variable capacity part of the hydraulic pump is held at the neutral position. As a result, when the operator moves on and off the vehicle, it is possible to prevent the hydraulic motor from rotating forward or reverse against the operator's intention and the vehicle body from suddenly starting.

Further, the present invention provides a roller drive device comprising: a variable displacement hydraulic pump driven by a prime mover having a variable displacement portion; and a hydraulic oil supplied and discharged from the hydraulic pump. A hydraulic motor for rotating the pressure port coupler, and a tilt for rotating the hydraulic motor forward or reverse by tilting the variable capacity portion of the hydraulic pump in response to pressure oil supplied and discharged from the outside. The hydraulic fluid is provided in the middle of the pipeline connecting the rotary actuator, the tilt actuator, and the pilot hydraulic pressure source, and is supplied and discharged during the tilt actuator. And a direction switching valve for switching the rotation of the hydraulic motor between normal and reverse by switching the direction of the hydraulic motor. The driving force reducing means is located upstream of the direction switching valve and the pipe Provided in the middle of the road, the movable floor plate is in the open position by the detection means Is released, pressurized oil within the tilting actuator is released, and when it is detected that the closed position has been reached, pressurized oil is supplied into the tilting actuator. This is because it is configured with an on-off valve.

With this configuration, when the movable floor plate is in the open position, the on-off valve releases the hydraulic oil in the tilting actuator, so the hydraulic pump's variable capacity Holds the neutral position. As a result, when the operator moves on and off, the hydraulic motor rotates forward or reversely against the operator's will. Therefore, it is possible to suppress the sudden start of the vehicle body. Further, the present invention provides a roller drive device comprising: a variable displacement hydraulic pump driven by a prime mover having a variable displacement portion; and a hydraulic oil supplied and discharged from the hydraulic pump. A hydraulic motor for rotating the pressure port coupler; and a parking brake for applying a braking force to the hydraulic motor during parking and releasing the braking force when the hydraulic motor is operated. The brake oil is provided in the middle of the brake line that supplies pressure oil for releasing the brake to the brake, and when the detection means detects that the movable floor plate has reached the open position, the pressure oil in the parking brake is released. It is configured by an on-off valve that supplies pressurized oil to the inside of the parking brake when it detects the release and the closed position.

With this configuration, when the movable floor plate is in the open position, the on-off valve allows pressurized oil in the parking brake to escape, so that a braking force is applied to the hydraulic motor by the parking brake. . As a result, when the operator moves on and off, it is possible to prevent the vehicle body from suddenly starting against the operator's will.

Further, the present invention provides a vehicle body in which front and rear compaction rollers are rotatably provided, a driver seat provided on a floor plate of the vehicle body, and the vehicle body for getting on and off the driver seat. A load roller comprising a step for mounting and dismounting provided on the side surface of the vehicle, wherein the vehicle body is located on one side or both sides in front of or behind the step for getting on and off and upward and downward. An extended handrail is provided, and the lower end side of the handrail extends below the floor plate of the vehicle body.

With this configuration, when getting on or off the driver's seat using the step-on / off steps as a foothold, the operator must be on the ground. It is possible to step on the getting on and off steps while securely grasping the handrail between the driver and the floor plate provided with the driver's seat. As a result, getting on and off the driver's seat can be performed safely, and the operator's fatigue when getting on and off can be reduced.

Further, the present invention provides a vehicle body in which front and rear pressure rollers are rotatably provided, a driver seat provided on a floor plate of the vehicle body, and a vehicle seat for getting on and off the driver seat. In a load roller comprising a step for getting on and off provided on a side surface, a cutout portion is provided in a portion of the floor plate of the vehicle body corresponding to the step for getting on and off, and the floor plate is provided with a notch. A movable floor plate that moves between an open position for opening the cutout portion and a closed position for closing the notch portion is provided, and the movable floor plate is provided with an operation member for opening and closing the movable floor plate.

With this configuration, the operator can easily set the movable floor plate to the open position and open the notch when entering or exiting the driver's seat, and the operator can use the notch. Can easily pass through the position of the floor, preventing the operator from getting on or off the floor plate or stepping on or off the step board when getting on or off. It can be done safely. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a front view showing a mouth drawer according to a first embodiment of the present invention.

FIG. 2 is an enlarged front view showing the essential parts such as the steps for getting on and off the vehicle, the front handrail, the rear handrail, and the movable floorboard in FIG.

FIG. 3 is an enlarged plan view showing essential parts such as a step for getting on and off, a front handrail, a rear handrail, and a movable floor plate.

FIG. 4 is a perspective view showing the step for getting on and off. FIG. 5 is a cross-sectional view of the step for getting on and off as viewed from the direction indicated by arrows VV in FIG.

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

FIG. 7 is an enlarged plan view of the state in which the movable floor plate is in the open position, as viewed from above the floor plate.

FIG. 8 is a front view showing a load roller according to the second embodiment.

FIG. 9 is a perspective view showing the step for getting on and off in FIG. 8. FIG. 10 is an enlarged front view of the same position as FIG. 2 showing a main part of the load roller according to the third embodiment.

FIG. 11 is an enlarged front view showing a movable floor plate, a switch, and the like in FIG. 10 in an enlarged manner.

FIG. 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 modified example 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 driving device driving force reducing means according to another modified example of the third embodiment.

FIG. 15 is a perspective view showing a modification of the getting on / off step.

FIG. 16 is a perspective view showing another modified example of the getting on / off step.

FIG. 17 is a front view showing a mouth roller according to the related art.

FIG. 18 is a plan view showing a conventional load roller. FIG. 19 is a cross-sectional view of a stepping-on / off step according to the prior art as viewed from the direction indicated by arrows XIX—XIX in FIG. BEST MODE FOR CARRYING OUT THE INVENTION

Hereinafter, an embodiment of a load roller according to the present invention will be described in detail with reference to FIG. 1 or FIG.

First, FIG. 1 to FIG. 7 show a first embodiment, in which 1 is a vehicle body of a load roller, and the vehicle body 1 is provided with a front-side pressure roller 6 described later in a rotatable manner. It comprises a front vehicle body 2 and a rear vehicle body 4, which is rotatably provided with a rear pressure roller 7, which will be described later, and which is connected to the front vehicle body 2 via a coupling device 3. In addition, between the front vehicle body 2 and the rear vehicle body 4, a steering mechanism for swinging the rear vehicle body 4 leftward and rightward with respect to the front vehicle body 2 around the coupling device 3. Linda 5 is provided.

Here, the front vehicle body 2 is formed in a box shape surrounded by an upper surface 2A, left and right side surfaces 2B, 2B, and a floor plate 8 described later. Hydraulic pumps (both not shown) are accommodated.

Reference numerals 6 and 6 denote a pair of front-side compaction rollers rotatably provided on the front vehicle body 2 while being spaced apart in the left and right directions. Each front-side compaction roller 6 is, for example, a metal drum. The weight can be adjusted by enclosing water or the like inside. In addition, a hydraulic motor (not shown) for rotating each front side pressure roller 6 is provided between the front vehicle body 2 and each front side pressure roller 6.

Reference numeral 7 denotes one rear compaction roller rotatably provided on the rear body 4, and the rear compaction roller 7 is made of a metal having a larger axial dimension than the front compaction roller 6. From the drum In addition, as in the case of the front-side pressure roller 6, the weight can be adjusted by sealing water or the like inside. Further, a hydraulic motor (not shown) for rotating the rear pressure roller 7 is provided between the rear vehicle body 4 and the rear pressure roller 7.

By rotating the hydraulic motor that drives each front roller 7 and the hydraulic motor that drives the rear roller 7 at the same speed, the vehicle 1 The vehicle runs on the road surface, and the pavement material spread on the road surface is rolled by the front-side compaction rollers 6 and the rear-side compaction rollers 7.

Reference numeral 8 denotes a floor plate according to the present embodiment, which is disposed substantially on the same plane as the upper surface 2A of the front vehicle body 2 and is provided on the rear side of the upper surface 2A. The floor plate 8 is as shown in FIG. Thus, a central floor portion 8A having a width dimension located between the left and right side surfaces 2B of the front vehicle body 2 and the left and right sides of the central floor portion 8A are provided. It consists of left and right overhangs 8B, 8B that protrude from the left and right sides 2B of 2 in a left and right eaves. On the rear side of the floor panel 8, a support base 9 for supporting each of the driver's seats 14 described later is provided extending leftward and rightward.

Reference numerals 10 and 10 denote left and right cutouts provided at portions of the overhang portion 8B of the floor panel 8 corresponding to the step 20 for getting on and off, which will be described later. The portion 10 is formed by notching a portion of the overhang portion 8B above the step 20 for getting on and off in a concave shape. The notch 10 is used when the operator who gets on and off the driver's seat 14 gets on the floor plate 8 from the getting on / off step 20 or gets off from the floor plate 8 on the getting on / off step 20. When the operator, feet, body This prevents a part of the body from being caught on the overhanging portion 8B of the floor panel 8 when passing through, etc., so that the operator can get on and off smoothly.

Reference numerals 1 1 and 1 1 denote left and right movable floor plates rotatably provided on an overhang portion 8 B of the floor plate 8 for opening and closing the notch portion 10. Is made of a steel plate having a shape almost equal to that of the notch 10. The movable floor plate 11 is rotatably attached to the overhang portion 8B of the floor plate 8 by hinge members 12 and 12 at its rear end side, and each hinge member 1 Centering around 2 between the open position where the notch 10 is opened (the position in Figs. 6 and 7) and the closed position where the notch 10 is closed (the position in Figs. 2 and 3) It is configured to rotate.

13 and 13 are gate lock levers as operating members provided on the left and right movable floor plates 11, respectively. The gate lock levers 13 are substantially U-shaped. It is formed of a bent bar, and its lower end is fixed to the upper surface of the movable floor plate 11 by welding or the like. Therefore, the gate lock lever 13 is an operation member that can easily open and close the movable floor plate 11 by rotating the movable floor plate 11. It is configured.

Here, the gate lock lever 13 has a protruding portion 13A that protrudes upward in a state where the movable floor plate 11 is in the force-closed position. When the movable floor plate 11 is in the closed position, the protrusion 13 A of the gate lock nozzle 13 is connected to the floor plate 8 and the driver's seat 14 as shown in FIG. It is forbidden for operators and the like to inadvertently get on and off between the floor plate 8 and the driver's seat 14 during paving work. On the other hand, when the movable floor plate 11 is in the open position, the gate lock lever 13 is moved to the floor plate 8 and the driver seat 14 as shown in FIG. To allow the operator to get on and off between the floorboard 8 and the driver's seat 14.

14 and 14 are two driver's seats arranged on the support base 9 apart from each other in the left and right directions. A cockpit 15 extends in the left and right directions in front of each driver's seat 14. The steering table 15 is provided with steering devices 16, 16, etc. for steering at positions corresponding to the driver's seats 14. By steering one of the steering devices 16 among the steering devices 16, the steering cylinder 5 described above expands and contracts, and the coupling device 3 becomes the center. The running direction of the load roller is controlled by swinging the rear body 4 left and right with respect to the front body 2.

Here, when the pavement material laid on the road surface is compacted using the load roller, for example, when the front-side compaction roller 6 etc. rides on the curb etc. provided on both the left and right sides of the road surface, However, the curb may be damaged by the front roller 6. For this reason, for example, when paving the right side of the road surface, the operator monitors the interference between the right front rolling roller 6 and the curb by using the right steering device 16 to control the load roller. To control the running. On the other hand, when paving the left side of the road surface, the operator controls the traveling of the load rollers by using the left steering device 16 to monitor the interference between the left front rolling roller 6 and the curb. It is configured to be able to

Reference numerals 17 and 17 denote forward and backward levers provided on the control table 15 near the left and right steering devices 16, respectively, and one of the forward and backward levers 17 is moved forward. The vehicle body 1 is configured to travel forward or backward by tilting to the side or the backward side. Also, each driver's seat 1 4 The upper side is covered with canopy 18.

The tanks 19 and 19 are mounted on the left and right side surfaces 2B of the front vehicle body 2, respectively. The tank 19 has a top surface 19 as shown in FIGS. It is formed in a rectangular parallelepiped box shape with A, lower surface 19B, front surface 19C, rear surface 19D, and left and right side surfaces 19E, 19E. Then, the tank 19 rotates the fuel supplied to the prime mover (not shown) housed in the front vehicle body 2 or rotates the front-side roller 6 and the rear-side roller 7. It stores hydraulic oil and the like supplied to each hydraulic motor to be driven.

Reference numerals 20 and 20 denote left and right steps for getting on and off according to the present embodiment. Each step 20 for getting on and off the left and right sides of the front vehicle body 2 using the tank 19. It is installed on the side 2B, 2B respectively.

Here, the step 20 for getting on and off is a three-step tread attached to the side surface 2B of the front vehicle body 2 via the tank 19, that is, the side surface 19E of the tank 19 Side step board 21 provided on the side, a middle step board 22 provided on the side face 19 E of the tank 19 located above the lower step board 21, and a top face 19 A of the tank 19 It consists of an upper step board 23 provided on the upper side.

Here, the lower step board 21 has a rectangular frame 21 A fixed to the side face 19 E of the tank 19 by welding or the like, and a front side inside the frame 21 A. It consists of three spacing plates 21 B provided in a lattice shape extending in the backward direction. In addition, between the frame 21A and the spacing plate 21B and between the spacing plates 21B, four see-through openings 21C that are opened upward and downward are formed. The lower tread 21 projects from the side surface 2B of the front vehicle body 2 to the left with a projection length L1. are doing.

The middle step board 22 is substantially the same as the lower step board 21. The middle step board 22 includes a rectangular frame body 22A fixed to the side face 19E of the tank 19 by welding or the like, and It consists of a single spacing plate 22B extending inside the body 22A, extending forward and backward. Further, between the frame body 22A and the spacing plate 22B, two see-through openings 22C opened upward and downward are formed. The middle tread 22 protrudes leftward from the side surface 2B of the front body 2 with a protrusion length L2, and the protrusion length L2 is the protrusion length of the lower tread 21. It is set smaller than L1 (L2 and L1).

Further, the upper step board 23 is substantially the same as the lower step board 21, and has a rectangular frame body 23 A fixed to the upper surface 19 A of the tank 19 by welding or the like, and It consists of a single spacing plate 23B that extends in the front and rear directions inside the body 23A. Further, between the frame 23A and the spacing plate 23B, two see-through openings 23C opened upward and downward are formed. The upper tread 23 protrudes leftward from the side surface 2B of the front vehicle body 2 with a protruding length L3, and the protruding length L3 is the protruding length of the middle tread 22. It is set to be smaller than the length L2 (L3 <L2). In the present embodiment, since the upper step board 23 is fixed to the upper surface 19 A of the tank 19, the see-through opening 23 C of the upper step board 23 is formed on the upper surface of the tank 19. Blocked by 19 A.

Thus, the step 20 for getting on and off is constituted by the lower tread 21, the middle tread 22, and the upper tread 23. Each of the treads 2 1, 2 2, and 2 3 has a large protruding length from the side 2 B of the front body 2 of the lower tread (lower tread 2 1) side. ) Side, the side of the front body 2 It has a staircase shape in which the protruding length from surface 2B is gradually reduced. As a result, the protruding end of the lower tread 21 becomes a step allowance protruding further left and right from the protruding end of the middle tread 22, and the protruding end of the middle tread 22 is Since the step margin further protrudes leftward and rightward from the protruding end of the upper step board 23, the operator steps on the steps 21, 22, and 23 securely while visually checking the steps 21, 22, and 23. The configuration is such that

Reference numerals 24 and 24 denote front handrails provided in front of the left and right getting on / off steps 20, respectively. The front handrail 24 is as shown in FIGS. 2 and 3. , Which is located forward of the steering device 16 and the forward / reverse lever 17 and is fixed to the projecting portion 8B of the floor plate 8 by the mounting plate 25 so as to rise upward. 4A, a horizontal portion 24B that is bent backward from the upper end of the rising portion 24A and extends horizontally in parallel with the floor plate 8, and a rear end of the horizontal portion 24B. It consists of 24 C, which is bent downward and hangs vertically downward from above the floor panel 8.

Here, the upper and lower intermediate parts of the hanging part 24 C are firmly supported by the bracket 26 fixed to the floor plate 8. The lower end of the hanging part 24 C, which is located below the bracket 26, is located between the front side pressure roller 6 and the stepping-in / step-out step 20 by the floor plate 8. It also extends downward, for example, to a position where it does not collide with the rear portion of the front rolling roller 6, that is, to an intermediate position between the middle step board 22 and the upper step board 23.

Reference numerals 27 and 27 denote rear handrails provided on the rear side of the left and right getting on / off steps 20 respectively. The rear handrail 27 and the front handrail 24 The step 20 for getting on and off is sandwiched between the front and the rear. Where the rear handrail Rise 27 is located on the rear side of driver's seat 14 and is fixed to support base 9 by mounting plate 28 and rises 27 A, which rises upward, and the upper end side of rise 27 A A horizontal portion 27B that is bent forward from the bottom and extends in the horizontal direction in parallel with the floor plate 8; a falling portion 27C that is bent downward from the front end side of the horizontal portion 27B; The lower part 27D is fixed to the middle part in the front and rear directions of the part 27B, and hangs vertically downward from above the floor plate 8.

Here, the upper and lower intermediate portions of the hanging part 27D are firmly supported by the bracket 29 fixed to the floor plate 8, and the hanging part 27D is formed. The lower end located below the bracket 29 is below the floor plate 8 between the connecting device 3 and the stepping-in / step-out step 20, for example, below the middle step board 22. And can be immediately grasped when the operator steps on the lower step board 21.

Therefore, when getting into the driver's seat 14, the operator does not have to extend his arm to above the floor plate 8, but instead has the hanging part 24 C of the front handrail 24 and the hanging part 2 4 of the rear handrail 27. It is possible to step on the treads 21, 22, and 23 of the step 20 for getting on and off while holding the 7D in a comfortable posture. Also, for example, even if the operator slips on the lower tread 21, the hanging part 24 C of the front handrail 24 immediately or the hanging part 2 of the rear handrail 27 may be used. 7 D The lower end side can be gripped.

The load roller according to the present embodiment has the above-described configuration, and when performing pavement work on a road surface using this load roller, first, an operator grips handrails 24 and 27. Then, the driver gets on the driver's seat 14 on the floor panel 8 using the step 20 for getting on and off as a foothold. Then, the operator seated in the driver's seat 14 operates the steering device 16, the forward / reverse lever 17, etc., and moves the load roller forward or backward to remove the pavement material laid on the road surface. The surface is compacted by the front compaction roller 6 and the rear compaction roller 7 to perform pavement work on the road surface.

However, according to the present embodiment, an improvement has been made so that the operator can quickly and safely get into the driver's seat 14 and get off the driver's seat 14. The operation will be described.

First, when getting into the driver's seat 14, the operator faces the entry / exit step 20, and the hanging part 24 C of the front handrail 24 and the hanging part 2 of the rear handrail 27. While grasping 7D, step on the lower step board 21, middle step board 22 and upper step 23 of the step 20 for getting on and off in order.

Here, for example, when the operator reaches the middle stepboard 22, the operator turns the movable floorboard 11 to the open position shown in FIGS. 6 and 7, and opens the cutout 10 of the floorboard 8. In this case, since the movable floor plate 11 is provided with the gate lock lever 13, by operating this gate lock lever 13, the operator can operate the gate lock lever 13. The movable floor plate 11 can be easily turned to the open position without putting a hand or the like between the movable floor plate 11 and the notch portion 10.

Then, the operator steps on the floor board 8 from the upper step board 23 through the notch 10. At this time, since the notch portion 10 is open, the operator can quickly get into the driver's seat 14 without catching a foot, a body, or the like on the overhang portion 8B of the floor plate 8. Can be done.

On the other hand, when getting out of the driver's seat 14, the operator With the back facing the driver's seat 14, while holding the hanging part 24 C of the front handrail 24 and the hanging part 27 D of the rear handrail 27, the floor plate 8 and the boarding / alighting step are held. By sequentially stepping on the upper step board 23, the middle step board 22 and the lower step board 21 of the step 20, it is possible to quickly reach the road surface.

In this case, in the present embodiment, each of the treads 21, 22, 23 constituting the step 20 for getting on and off is connected to the side 2 of the front body 2 of the tread on the lower (lower tread 21) side. The protruding length from B is large, and the protruding length from the side surface 2B of the front vehicle body 2 is gradually reduced toward the upper step (upper step board 23) side. Accordingly, the operator can visually recognize the protruding end of the middle tread 22 as a step allowance that further protrudes from the protruding end of the upper tread 23, and recognizes the protruding end of the lower tread 21 as a middle tread. 22 It can be visually observed as a step allowance further protruding from the protruding end. Therefore, when getting into the driver's seat 14 when the operator gets into the driver's seat 14, the operator can step on the treads 21, 22. Operation can be performed quickly and safely.

The lower tread 21, the middle tread 22, and the upper tread 23 constituting the step 20 for getting on and off are provided with see-through openings 21 C, 22 C, and 2 C respectively opening upward and downward. 3 C is provided. Therefore, even if asphalt or the like falls on the lower tread 21, the middle tread 22, and the upper tread 23, the asphalt or the like can be seen through the openings 21 C, 22 C, and 2. It can be discharged through 3C, preventing the operator from slipping on the treads 21, 22, and 23 when getting on and off.

In addition, a front handrail 24 and a rear handrail 27 are provided in front of and behind the step 20 for getting on and off, and the hanging part of the front handrail 24 is provided. The structure is such that 24 C and the hanging part 27 D of the rear handrail 27 extend below the floor plate 8. Therefore, the operator does not have to extend his arm above the floor plate 8 and, in a comfortable position, attaches the hanging part 24 C of the front handrail 24 and the hanging part 27 D of the rear handrail 27. It is possible to get into the driver's seat 14 quickly and safely while grasping. Furthermore, when descending from the driver's seat 14 to the ground, the operator keeps his / her back on the driver's seat 14 and keeps the front handrail 24 from the driver's seat 14 until reaching the road surface. The hanging part 24 C of the rear handrail 27 and the hanging part 27 D of the rear handrail 27 can be held at all times, and the driver can safely get off the driver's seat 14.

For this reason, for example, even when the operator slips on the treads 21, 22, 23, etc. of the step 20 for getting on and off at night, at the time of rainfall, or at the time of snowfall, the front handrail 24 and the rear handrail are used. 27 and can support the body and ensure safety when getting on and off.

Moreover, the lower end of the hanging part 24 C of the front handrail 24 extends to an intermediate position between the middle step board 22 and the upper step board 23 between the front pressure roller 6 and the step 20 for getting on and off. The lower part 27 D of the rear handrail 27 extends downward from the middle stepboard 22 between the connecting device 3 and the stepping-in / step-out step 20. I have. Therefore, even if the operator falls down from the getting on / off step 20, the operator's feet or the like may be caught in the front-side pressure roller 6 or may be connected by the connecting device 3. It is possible to prevent the vehicle body 2 from being caught between the vehicle body 2 and the rear vehicle body 4, and it is possible to further improve safety when getting on and off.

Next, the operator in the driver's seat 14 applies pavement material such as asphalt spread on the road surface to the load roller. When performing pavement work,

Then, the movable floor plate 11 is rotated to the closed position shown in FIG. 2, and the notch 10 of the floor plate 8 is closed. By driving the roller, the pavement material is compacted by the front-side pressure roller 6 and the rear-side pressure roller 7.

Here, for example, the operator looks down the road surface from above the floor plate 8 while standing on the floor plate 8 in order to check the pavement state of the road surface by the front-side roller 6 and the rear-side roller 7. In this case, by closing the cutout portion 10 of the floor plate 8 with the movable floor plate 11, a wide scaffold on the floor plate 8 can be secured.

When the operator checks the pavement state of the road surface from the floor plate 8, the operator checks each of the see-through openings 2 2 C provided in the middle step board 22 and each of the see-through openings 21 provided in the lower step board 21. The road surface can be seen through C. Therefore, the operator can perform pavement work on the road surface while checking the pavement state of the road surface from the driver's seat 14 side over a wide range, and the workability can be greatly improved.

In addition, when the movable floor plate 11 is in the closed position, the projection 13 A of the gate lock lever 13 projects above the movable floor plate 11, and the floor plate 8 and the driver seat 14 are protruded. Stand up to block the path between Therefore, the gate lock lever 13 allows the operator to inadvertently get off the driver's seat 14 during paving work or to accidentally get into the driver's seat 14 by paving. Can be prohibited and safety during paving work can be ensured.

Next, FIGS. 8 and 9 show a second embodiment according to the present invention. The feature of this embodiment is that a step for getting on and off is configured. Each of the treads to be formed has a step-like shape in which the position of the rear end is sequentially shifted forward from the lower side toward the upper side. Note that, in the present embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 31 denotes left and right getting on / off steps (only the left side is shown) applied to the present embodiment in place of the getting on / off steps 20 according to the first embodiment. Steps 31 for getting on and off are provided on the left and right side surfaces 2B of the front vehicle body 2 using the tank 19, respectively.

Then, the step 31 for getting on and off is a three-step tread provided on the side surface 2B of the front body 2 via the tank 19, that is, the side surface 19E of the tank 19 A lower step board 32 provided on the lower end side, a middle step board 33 provided on the side face 19 E of the tank 19 located above the lower step board 32, and an upper section of the middle step board 3 3 It is composed of an upper step board 34 provided on the side face 19 E of the tank 19 at the upper end side.

Here, as shown in FIG. 9, the lower step board 32 includes a rectangular frame 32 A fixed to the side face 19 E of the tank 19 by welding or the like, and It consists of four spacing plates 32B provided inside the 32A and extending in the front and rear directions in a grid pattern. Further, between the frame 32A and the spacing plate 32B, and between the spacing plates 32B, five transparent openings 32C opened upward and downward are formed. I have. The lower tread 32 protrudes from the side surface 19E of the tank 19 to the left with the longest protruding length A1. The front and rear lengths B 1 of the lower tread 32 are set to be substantially equal to the front and rear lengths of the tank 19, and the front end 32 A of the frame 32 A is set. 1 is at the same position as 19 C on the front of tank 19 Similarly, the rear end 32A2 is located at the same position as the rear surface 19D of the tank 19.

Also, the middle step board 33 is located above the lower step board 32 and is fixed to the side face 19 E of the tank 19 by welding or the like. It consists of three spacing plates 33 B provided in a lattice shape and extending in the front and back directions inside the body 33 A. And, between the frame 33A and the spacer 33B, and between the spacers 33B, four transparent openings 33C opened upward and downward are formed. ing.

The middle step board 33 projects from the side face 19 E of the tank 19 with a projecting length A 2, which is longer than the projecting length A 1 of the lower step board 32. Is also set to be small (A 2 <A 1). In addition, the length B2 in the front and rear directions of the middle tread 33 is set to be smaller than the length B1 in front and rear of the lower tread 32 (B2 <B1), and The front end of 33 A 33 A 1 is shifted backward by a length C 2 from the front 19 C of tank 19, and the rear end 33 A 2 is also the rear surface of tank 19 19 D From the front by a length D 2.

Further, the upper step board 34 is located above the middle step board 33, and is fixed to the side face 19E of the tank 19 by welding or the like. It consists of two spacers 34B extending inside the frame 34A in the front and rear directions. Further, between the frame 34A and the spacing plate 34B and between the spacing plates 34B, three see-through openings 34C opened upward and downward are formed. I have.

The upper tread 34 protrudes from the side surface 19 E of the tank 19 with a protruding length A 3, which is longer than the protruding length A 2 of the middle tread 33. Is also set to be small (A 3 <A 2). Also, the length in the front and rear directions of the upper step board 3 4 B 3 is set to be approximately equal to the length B 2 in the front and rear directions of the middle tread 33, and the front end 34 A 1 of the frame 34 A is equal to the front 19 C of the tank 19. In a new position. However, the rear end 34 A 2 of the frame 34 A is shifted forward by a length D 3 from the rear surface 19 D of the tank 19. The length from the rear surface 19 D of the link 19 to the rear end 33 A 2 of the frame 33 A of the middle tread 33 is set to be larger than D 2 (D 3> D 2).

Thus, each of the steps 31, 33, and 34 constituting the step 31 for getting on and off is moved from the side 19 E of the tank 19 from the lower step 32 to the upper step 34. The protruding length is gradually reduced and the rear end position is gradually shifted forward from the lower step board 32 to the upper step board 34.o

The load roller according to the present embodiment has the step 31 for getting on and off as described above, and the first operation for compacting an asphalt or the like spread on the road surface during pavement work on the road surface is the first. There is no particular difference from the embodiment.

However, according to the present embodiment, the treads 3 2, 3 3, and 3 4 constituting the step 31 for getting on and off are moved from the lower (lower tread 3 2) side to the upper (upper tread 34) side. It is configured in a staircase shape in which the protruding length of the front vehicle body 2 from the side surface 2B gradually decreases. Therefore, the protruding end of the middle tread 33 can be visually recognized as a step allowance further protruding from the protruding end of the upper tread 34, and the protruding end of the lower tread 32 can be visually recognized as the protruding end of the middle tread 33. It can be visually observed as a step allowance that projects further from the part.

Therefore, at the time of getting on and off, the operator can always step on these tread plates 32, 33, 34 while always visually checking them. It is possible to get on and off the driver's seat 14 quickly and safely.

In addition, each of the treads 32, 33, and 34 of the getting-in / step-out step 31 is moved forward from the lower end (lower tread 32) to the upper (upper tread 34) from the lower end. It is configured in a staircase that deviates. Therefore, for example, in paving work on narrow roads, etc., even if it is difficult to secure sufficient space for getting on and off in the left and right directions of the front vehicle body 2, the operator can use the step for getting on and off. Using the platform as a scaffold, it is possible to get on and off from the front and rear of the front vehicle body 2 reliably.

In addition, the lower step board 32, the middle step board 33, and the upper step board 34, which constitute the step 31 for getting on and off, are provided with see-through openings 32C, 33C, 34C that open upward and downward respectively. C is provided.

Therefore, the lower step board 3 2, the middle step board 3 3, and the upper step board 3

Even if an asphalt or the like falls to 4, it can be discharged through the see-through openings 32C, 33C and 34C, and the operator can Can be prevented from slipping on the steps 32, 33 and 34 when getting on and off. In addition, during pavement work on the road surface, the operator views from the top of the floor plate 8 to each of the see-through openings 3 4 C of the upper tread plate 34, the middle tread plate 33 to each of the see-through openings 3 3 C, and the lower tread plate 32 for each of the see-through openings. The road surface can be seen through the opening 32C. For this reason, the operator can perform pavement work on the road surface while checking the pavement condition of the road surface from a driver's seat 14 side over a wide area o

Next, FIGS. 10 and 12 show a third embodiment according to the present invention. The feature of this embodiment is that the movable floor plate is in the open position or the closed position. Detection means for detecting A configuration in which a roller driving device that drives the pressure roller is provided with driving force reducing means for reducing the driving force of the pressure roller when the detection means detects that the movable floor plate has reached the open position. That's what I did. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, reference numeral 41 denotes a switch provided on the lower surface of the overhang portion 8B of the floor plate 8 and serving as detecting means for detecting that the movable floor plate 11 has reached the open position or the closed position. The switch 41 is attached to an L-shaped bracket 42 bolted to the underside of the overhang 8B at the rear side of the notch 10. On the lower surface side of the movable floor plate 11, the switch 41 is closed when the movable floor plate 11 reaches the closed position indicated by the solid line, and the movable floor plate 11 is opened by the double-dot chain line. Open switch 41 when it reaches position L-shaped bracket 4

3 are provided.

Then, the switch 41 is closed by the bracket 43 when the movable floor plate 11 is in the closed position, and the switch valve to be described later is opened.

A detection signal is output to 67. Reference numeral 44 denotes a stop located on the bracket 42 near the switch 41, and the stop 44 is provided when the movable floor plate 11 is in the closed position. By abutting brackets 43 when

, Which protects the switch 41.

Next, FIG. 12 shows a roller driving device for driving the front-side pressure roller 6 and the rear-side pressure roller 7.

It is composed of a hydraulic pump 51, a hydraulic motor 53, a tilting actuator 61, a direction switching valve 63, and the like, which will be described later.

5 1 is a variable displacement oil driven by the prime mover 52 In the pressure pump, the hydraulic pump 51 has a variable capacity portion 51A made of, for example, a slope, and changes the discharge capacity by tilting the variable capacity portion 51A. It is what makes it.

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

When the variable capacity portion 51A of the hydraulic pump 51 is tilted in the direction of arrow F from the neutral position shown in the figure, the hydraulic motor 53 rotates forward and each of the pressure rollers 6 and 7 is rotated. When the variable capacity section 51A tilts in the direction indicated by the arrow R, the hydraulic motor 53 reversely rotates, and each of the pressure rollers 6, 7 rotates backward. I have.

Reference numeral 56 denotes a charging pump driven by a prime mover 52 together with a hydraulic pump 51. The charging pump 56 supplies the hydraulic oil in the tank 19 to the pipeline 57 and By supplying the main pipelines 54, 55 via the check valves 58, 59, the generation of the cavity in each of the main pipelines 54, 55 is generated. This is to prevent Further, the charging pump 56 constitutes a pilot hydraulic pressure source for supplying pilot pressure oil to a tilting actuator 61 described later. Reference numeral 60 denotes a relief valve for setting the maximum pressure of the hydraulic oil discharged from the charging pump 56.

6 1 is the tilt-up function, and the tilt-up rate is

Numeral 61 indicates that the hydraulic motor 53 is rotated forward or backward by tilting the variable capacity portion 51A of the hydraulic pump 51. Then, the tilting actuator 61 is connected to the cylinder 61A and to the pi- sition slidably inserted in the cylinder 61A. A piston 6 IB, two oil chambers 61C, 61D defined in the cylinder 61A by the piston 61B, and each oil chamber 61C, The springs 6 1E and 6 1F are provided in the 6 ID and bias the piston 6 IB toward the neutral position. The piston 61B is connected to a variable displacement section 51A of the hydraulic pump 51 via a link 62.

Reference numeral 63 denotes a directional control valve which is operated by a forward / reverse lever 17 provided on the control table 15. The directional control valve 63 is a tilting pump from the charging pump 56. The rotation of the hydraulic motor 53 is switched between forward and reverse by switching the direction of the pressure oil supplied and discharged to each of the oil chambers 61C and 61D in the evening 61. Here, in the directional control valve 63, the pump port is connected to the charging pump 56, and the tank port is connected to the tank 19. The directional control valve 63 has one output port connected to the oil chamber 61 C of the tilting actuator 61 via a pipe line 64, and the other output port connected to a pipe. It is connected to the oil chamber 61D of the tilting station 61 via road 65.

The directional control valve 63 is switched from the neutral position (I) to the forward position (Π) or the reverse position (m) by operating the forward / reverse lever 17. When the directional control valve 63 is in the neutral position (I), the displacement section 51A of the hydraulic pump 51 is in the neutral position, and the hydraulic motor 53 stops.

When the directional control valve 63 is switched to the forward position (Π), the pressure oil from the charging pump 56 is tilted. When the piston 61 B is supplied to C and the piston 61 B slides to the left in the figure, the variable capacity portion 51 of the hydraulic pump 51 is indicated by an arrow via the link 62. The hydraulic motor 53 rotates forward, and the pressure rollers 6 and 7 rotate forward.

On the other hand, when the directional control valve 63 is switched to the retreat position (m), the pressure oil from the charging pump 56 is supplied to the oil chamber 61D of the tilt actuator 61. When the piston 61B slides to the right in the drawing, the variable displacement portion 51 of the hydraulic pump 51 is tilted in the direction of the arrow 1 via the link 62. The hydraulic motor 53 is rotated in the reverse direction, and the pressure rollers 6 and 7 rotate backward.

Reference numeral 66 denotes a bypass line, and the bypass line 66 is a line between the directional control valve 63 and each of the oil chambers 61C and 61D of the tilting actuator 61. It is connected between 64 and 65. The bypass pipe 66, together with an on-off valve 67, which will be described later, constitutes a driving force reducing means for reducing the driving force of the front pressure roller 6 and the rear pressure roller 7.

Reference numeral 67 denotes an on-off valve provided in the middle of the bypass pipe 66 to open and close the bypass pipe 66 in response to a detection signal from the switch 41. It consists of a solenoid valve at port 2 and has a solenoid 67 A and a spring 67 B.

When the movable floor plate 11 is in the open position and the switch 41 is open, the on-off valve 67 holds the valve open position (a) by the spring 67B. Then, by-pass pipe 66 is opened to communicate between pipes 64 and 65. On the other hand, when the movable floor plate 11 is in the closed position and the switch 41 is closed, the on-off valve 67 is connected to the solenoid node 67 A from the switch 41. The valve is switched to the valve closing position (b) by the signal output to the valve, and the bypass line 66 is closed to cut off between the lines 64 and 65. The load roller according to the present embodiment has the above-described configuration, and the basic operation of staking an asphalt or the like spread on the road surface during pavement work on the road surface is according to the first embodiment. There is no particular difference.

However, the load roller according to the present embodiment has been improved so that the operator can quickly and safely enter the driver's seat 14 and get off the driver's seat 14. Hereinafter, the getting on / off operation of the operator will be described.

First, when getting into the driver's seat 14, the operator grasps the hanging part 24 C of the front handrail 24 and the hanging part 27 D of the rear handrail 27 while getting on and off. Step 20 on the lower tread 21, the middle tread 22, and the upper tread 23 in step 20. Further, for example, when the operator reaches the middle stepboard 22, the operator turns the movable floorboard 11 to the open position, opens the notch 10 of the floorboard 8, and cuts the notch from the upper stepboard 23. By stepping on the floor plate 8 through the part 10, the driver can quickly get into the driver's seat 14 without catching his / her body, etc. on the overhang 8 B of the floor plate 8. Can be done.

Here, when the movable floor plate 11 is in the open position, the switch 41 opens and the on-off valve 67 holds the open position (a). , 65 communicate with each other through a bypass line 66, and the pressure in the oil chambers 61 C, 61 D of the tilting reactor 61 becomes almost equal. As a result, the piston 61B of the tilt actuator 61 moves to the neutral position by the springs 6IE and 61F, and the discharge amount of the hydraulic pump 51 decreases. As a result, the traveling driving force of the front rolling roller 6 and the rear rolling roller 7 by the hydraulic motor 53 is reduced.

Therefore, for example, the operator who gets into the driver's seat 14 touches the forward / reverse lever 17 carelessly, and the directional control valve Even if 6 3 is switched to the forward position (Π) or the reverse position (ΙΠ), the tilting actuator 6 1 holds the neutral position, which is contrary to the operator's will. As a result, it is possible to suppress the sudden opening of the loading opening, thereby ensuring safety when getting into the driver's seat 14.

On the other hand, when the operator who gets into the driver's seat 14 performs paving work to tamper with the asphalt laid on the road surface by the mouth drawer, the operator first has to move the movable floor plate 1. 1 is rotated to the closed position, and the notch 10 of the floor plate 8 is closed by the movable floor plate 11.

As a result, the switch 41 is closed, the on-off valve 67 is switched to the closed position (b), the bypass line 66 is closed, and the line 64, 65 is shut off. You. In this state, for example, when the operating lever tilts the forward / reverse lever 17 forward and switches the directional control valve 63 to the forward position (Π), the hydraulic oil from the charging pump 56 is released. The oil is supplied to the oil chamber 61 C of the tilt actuator 61 through the pipes 57 and 64. As a result, the piston 61B slides to the left in the drawing, and the variable displacement portion 51A of the hydraulic pump 51 tilts in the direction indicated by the arrow F via the link 62. When the hydraulic motor 53 rotates forward, the load roller moves forward.

When the operator tilts the forward / reverse lever 17 backward and switches the directional control valve 63 to the retracted position (m), the pressure from the charging pump 56 is reduced. Oil is supplied to the oil chamber 61D of the tilting reactor 61 through lines 57 and 65. As a result, the piston 61B slides to the right in the drawing, and the variable capacity portion 51A of the hydraulic pump 51 tilts in the direction of the arrow R via the link 62. Then, the hydraulic motor 53 reversely rotates, so that the load roller travels backward. Thus, by operating the steering device 16 while moving the load roller forward or backward, the front rolling roller 6 and the rear rolling roller 7 can be used on the road surface. Paving work can be performed to lay the laid asphalt.

Next, when getting out of the driver's seat 14, the operator returns the forward / reverse lever 17 to the neutral position to stop the load roller, and then moves the gate lock lever 1 on the movable floor plate 11. 3 is operated to rotate the movable floor plate 11 to the open position, and the notch 10 of the floor plate 8 is opened. Then, the operator grasps the hanging part 24 C of the front handrail 24 and the hanging part 27 D of the rear handrail 27, and moves on to the floor plate 8 and the upper step of the getting on / off step 20. By sequentially stepping on the plate 23, the middle tread 22 and the lower tread 21, it is possible to quickly reach the road surface.

In this case, when the movable floor plate 11 is in the open position, the switch 41 is opened and the on-off valve 67 holds the open position (a). For this reason, as described above, for example, the operator descending from the driver's seat 14 touches the forward / reverse lever 17 and the directional control valve 63 is moved to the forward position (Π) or the reverse position (DI). ), The traveling drive force of the front roller 6 and the rear roller 7 by the hydraulic motor 53 is reduced, and the sudden start of the roller can be suppressed. As a result, safety when getting off the driver's seat 14 can be ensured.

Next, FIG. 13 shows a modification of the above-described third embodiment. In this modification, in the middle of the pipeline connecting the tilting actuator and the pilot hydraulic power source. The provided on-off valve constitutes a driving force reducing means.

In the figure, 71 is the direction cut with the charging pump 56. The switching valve is located between the switching valve 63 (upstream of the direction switching valve 63) and provided as a driving force reducing means provided in the middle of the pipeline 57, and the switching valve 71 is It consists of a 3 port 2 position solenoid valve, and has a solenoid 71 A and a spring 71 B.

When the movable floor plate 11 is in the open position and the switch 41 is open, the on-off valve 71 holds the valve closed position (c) by the spring 71B. As a result, when the directional control valve 63 is switched to the forward position (または) or the backward position (m), the oil chamber 61C or the tilt chamber 61 of the tilting actuator 61 is moved. Release the pressurized oil in 1 D to tank 19. On the other hand, when the movable floor plate 11 is in the closed position and the switch 41 is closed, the on-off valve 71 is a signal output from the switch 41 to the solenoid unit 71A. When the directional control valve 63 is switched to the forward position (Π) or the reverse position (m) by switching to the valve opening position (d), the charging port is switched. The configuration is such that pressure oil is supplied from the pump 56 to the oil chamber 61C or 61D of the tilt actuator 61.

This modified example has the above-described configuration, and the driver's seat 1

When the operator turns the movable floor plate 11 to the open position when entering the vehicle 4 or getting out of the driver's seat 14, the switch 41 opens and the on-off valve 71 opens. Maintain the closed position (c).

Thus, for example, the operator getting on and off the driver's seat 14 touches the forward / reverse lever 17 and the directional control valve 63 is switched to the forward position (Π) or the reverse position (m). Even when the piston 61B of the tilting actuator 61 moves to the neutral position by the springs 61E and 61F, the hydraulic pump The discharge amount of the pump 51 is reduced, and the traveling driving force of the front roller 7 and the rear roller 7 by the hydraulic motor 53 is reduced. As a result, the sudden start of the load roller against the operator's intention can be suppressed, and safety during getting on and off can be secured.

Then, when the operator in the driver's seat 14 turns the movable floor plate 11 to the closed position, the switch 41 is closed and the on-off valve 71 is opened to the open position (d ). In this state, when the operator switches the directional control valve 63 to the forward position (Π) or the backward position (Π) using the forward / reverse lever 17, the charge pump 56 starts moving from the charging pump 56. Pressure oil is supplied to the oil chamber 61C or oil chamber 61D of the tilt actuator 61, and the variable capacity part 51A of the hydraulic pump 51 is moved in the direction of arrow F or R. By being tilted, the load roller can be moved forward or backward.

Next, FIG. 14 shows another modification of the third embodiment described above. In this modification, a parking brake for applying a braking force to a hydraulic motor is provided, and the parking brake is released from the brake. An opening / closing valve provided in the middle of a brake line for supplying pressurized oil constitutes driving force reducing means.

In the figure, reference numeral 81 denotes a negative type parking brake attached to the hydraulic motor 53. The parking brake 81 slides in the brake cylinder 81A and the brake cylinder 81A. A piston 81 C that is provided so as to define a brake release chamber 81 B in the brake cylinder 81 A, and the output shaft of the hydraulic motor 53 is formed by the piston 81 C. And a brake spring 8 1 E for urging the piston 81 C so as to press the friction plate 81 D against the output shaft of the hydraulic motor 53. It consists of The parking brake 81 applies a braking force to the hydraulic motor 53 by the brake spring 81E during parking. On the other hand, when the hydraulic motor 53 is actuated, the parking brake 81 presses the brake release pressure from the charging pump 56 into the brake release chamber 81B through a brake line 82, which will be described later. By supplying the oil, the brake is applied to the brake spring 81E to release the braking force on the hydraulic motor 53.

Reference numeral 82 denotes a brake line, and the brake line 82 connects the brake release chamber 81B of the parking brake 81 to the line 157 connected to the charging pump 156. is there . The brake line 82 supplies the hydraulic oil from the charging pump 56 to the brake release chamber 81B as the brake release pressure.

Reference numeral 83 denotes an opening / closing valve provided as a driving force reducing means provided in the middle of the brake pipe line 82. The opening / closing valve 83 comprises an electromagnetic valve having three ports and two positions. It has a part 83A and a spring 83B.

When the movable floor plate 11 is in the open position and the switch 41 is open, the on-off valve 83 holds the valve closed position (e) by the spring 83B. As a result, the pressure oil in the brake release chamber 81B is released to the tank 19, and a braking force is applied to the hydraulic motor 53 by the parking brake 81. On the other hand, when the movable floor plate 11 is in the closed position and the switch 41 is closed, a signal output from the switch 41 to the solenoid node 83A is generated. By switching to the valve opening position (f), the configuration is such that the pressure oil from the charging pump 56 is supplied to the brake release chamber 81B through the brake line 82. ing. The present modified example has the above-described configuration. When the movable floor plate 11 is turned to the open position when the operator gets on and off, the switch 41 is opened and the on-off valve 83 is closed. By holding the position (e) and allowing the hydraulic oil in the brake release chamber 81B to escape to the tank 19, the parking brake 81 becomes hydraulic motor

5 Apply braking force to 3.

Therefore, for example, when the operator gets into the driver's seat 14, the operator touches the forward / reverse lever 17, and the directional control valve 63 is switched to the forward position (後) or the reverse position (m). Even if the hydraulic oil from the hydraulic pump 51 is supplied to and discharged from the hydraulic motor 53, the hydraulic motor 53 is still receiving the braking force by the parking brake 81, so that the hydraulic motor 53 As a result, the traveling driving force of the front roller 7 and the rear roller 7 is reduced. As a result, sudden start of the load roller against the operator's intention can be suppressed, and safety when the operator gets on and off the vehicle can be secured.

Then, when the operator in the driver's seat 14 turns the movable floor plate 11 to the closed position, the switch 41 is closed and the on-off valve 83 is opened to the open position (f ), The pressure oil from the charging pump 56 is supplied to the brake release chamber 81B through the brake line 82, and the braking force on the hydraulic motor 53 is released.

In this state, when the operator switches the directional control valve 63 to the forward position (Π) or the backward position (ΠΙ) by the forward / reverse lever 17, the pressure from the charging pump 56 is reduced. Oil is supplied to oil chamber 61C or oil chamber 61D of tilting pump 61, and variable capacity section 51A of hydraulic pump 51 tilts in the direction of arrow F or R. As a result, the load roller can be moved forward or backward. Next, Fig. 15 shows a modified example of the step for getting on and off, and the step for getting on and off 91 according to this modified example also includes the lower stepping board 92, the middle stepping board 93, and the upper stepping board 94. It is configured.

Here, the lower step board 92 is composed of a frame 92A and a spacing board 92B, and protrudes from the side face 19E of the tank 19 with a projection length A111. . On the other hand, the length B11 in the front and rear directions of the lower tread 92 is set to be almost equal to the length in the front and rear directions of the tank 19, and the front end 92A of the frame 92A. 1 is at a position equivalent to the front surface 19C of the tank 19, and a rear end portion 92A2 is at a position equivalent to the rear surface 19D of the tank 19.

The middle step board 93 is composed of a frame body 93A and a spacing board 93B, and has a projecting length A smaller than the above-mentioned projecting length A11 from the side face 19E of the tank 19. It protrudes with 1 2. On the other hand, the front and rear lengths B12 of the middle tread 93 are set smaller than the above-mentioned length Bl1, and the front end 93A1 of the frame 93A is tank 1 It is at the same position as the front surface 19C of 9 and the rear end 93A2 is shifted forward from the rear surface 19D of the tank 19 by a length D12.

Further, the upper step board 94 is composed of a frame body 94A and a spacing board 94B, and the projecting length from the side face 19E of the tank 19 is smaller than the projecting length A12 described above. It protrudes with A13. On the other hand, the length B 13 in the front and rear directions of the upper tread 94 is set to be smaller than the length B 12 described above, and the front end 94 A 1 of the frame 94 A is tank 1 9 is located at the same position as the front surface 19 C, and the rear end 94 A 2 is longer than the length D 12 above from the rear surface 19 D of the tank 19. It is only shifted forward.

Thus, each of the treads 9 2, 9 3, and 9 4 constituting the step 91 for getting on and off the tanks is arranged from the lower side to the upper side. The projecting length from the side surface 19E of the front end is gradually reduced, and the position of the rear end is sequentially shifted forward from the lower stage toward the upper stage.

Next, Fig. 16 shows another modified example of the step for getting on and off, and the step 95 for getting on and off according to this modified example also includes a lower step board 96, a middle step board 97 and an upper step board 98. Have been.

Here, the lower step board 96 comprises a frame body 96 A and a spacing board 96 B, and projects from the side face 19 E of the tank 19 with a projecting length A 21. . On the other hand, the length B 21 in the front and rear directions of the lower step board 96 is set to be smaller than the length in the front and rear directions of the tank 19, and the front end portion 96 A 1 of the frame body 96 A is formed. Is shifted backward by a length C 21 from the front surface 19 C of the tank 19, and the rear end portion 96 A 2 is located at the same position as the rear surface 19 D of the tank 19.

The middle step board 97 comprises a frame body 97 A and a spacing board 97 B, and a projecting length A smaller than the projecting length A 21 from the side face 19 E of the tank 19. It protrudes with 2 2. On the other hand, the front and rear lengths B22 of the middle step board 97 are set to be equal to the above-mentioned length B21, and the front end 97A1 of the frame 97A is tank 19 The rear end 97 A 2 is shifted forward by a length D 22 from the rear surface 19 D of the tank 19 from the front 19 C of the tank 19 by a length C 22.

Further, the upper step board 98 includes a frame body 98A and a spacing board 98B, and the projecting length from the side face 19E of the tank 19 is smaller than the projecting length A22 described above. It protrudes with A23. On the other hand, the front and rear lengths B 23 of the upper step board 98 are set to be equal to the above-mentioned length B 21, and the front end 98 A 1 of the frame 98 A is provided with the tank 19. At the same position as the front 19C, the rear end 98A2 is from the rear 19D of the tank 19 as described above. Is shifted forward by a length D 23 greater than the length D 22.

Thus, each of the treads 96, 97, 98 constituting the getting-on / off step 95 has a projecting length from the side surface 19 E of the tank 19 from the lower side to the upper side. It is configured so as to be gradually smaller, and that the position of the rear end is sequentially shifted forward from the lower side toward the upper side.

In the above-described embodiment, the front vehicle body 2 provided with the front-side pressure roller 6 and the rear vehicle body 4 provided with the rear-side pressure roller 7 can swing through the coupling device 3 and the like. The present invention is not limited to this, but the present invention is not limited to this. For example, the front roller 6 and the rear roller 7 are connected to a single body. It can also be applied to the provided mouth rollers.

Also, in the first embodiment described above, the treads 21, 22, and 23 constituting the step 20 for getting on and off are connected to the side surface 2 B of the front vehicle body 2 via the tank 19. The case where it was provided in the example was mentioned. However, the present invention is not limited to this, and for example, a configuration may be employed in which the treads 21, 22, and 23 are directly fixed to the side surface 2 B of the front vehicle body 2. The same applies to each of the treads 32, 33, and 34 constituting the getting on / off step 31 of the second embodiment.

Further, in the first embodiment described above, the step 20 for getting on and off is constituted by three steps (lower step 21, middle step 22, upper step 23). The invention is not limited to this, and may be constituted by, for example, two or four or more steps. The same applies to the getting on / off step 31 of the second embodiment.

In the first embodiment described above, the step for getting on and off Each of the treads 21, 22, 23 of the step 20 is composed of a frame 21 A, 22 A, 23 A and a spacing plate 21 B, 22 B, 23 B, respectively. As a result, an example has been given in which the perspective openings 21C, 22C, and 23C, which open upward and downward, are formed in the treads 21, 22, and 23, respectively. However, the present invention is not limited to this. For example, each step may be configured by a steel plate having a transparent opening formed by pressing or the like, such as a punching board. The same applies to the getting on / off step 31 of the second embodiment.

In each of the above-described embodiments, the movable floor plate 11 that opens and closes the notch 10 provided in the floor plate 8 is rotatably attached to the floor plate 8 via the hinge member 12. However, the present invention is not limited to this, and for example, a movable floor plate that slides in the horizontal direction along the floor plate 8 may be provided. In this example, a front handrail 24 is provided at the front of step 20 (31), and a rear handrail 27 is provided at the rear of step 20 (31). However, the present invention is not limited to this. For example, only one of the front handrail 24 and the rear handrail 27 may be provided.

Further, in the third embodiment described above, the lines 64, 65 are provided between the directional control valve 63 and the oil chambers 61C, 61D of the tilting actuator 61, respectively. Thus, the case where a bypass pipe 66 is provided between these pipes 64 and 65 is shown as an example. However, the present invention is not limited to this, and the connection position of the no-pass line 66 is shifted to each of the oil chambers 61C and 61D of the actuator 61. Between the oil chambers 6 1 C and 6 1 D by the bypass line 66. May be directly connected. Industrial applicability

As described in detail above, according to the present invention, the step for getting on and off is constituted by a plurality of steps provided so as to protrude leftward and rightward from the side of the vehicle body. The stepped shape of the lower tread was designed so that the length of the lower tread protruding from the side of the vehicle body was large, and the length of the tread from the side of the vehicle gradually became smaller toward the upper stage. The protruding end of the upper tread can be visually viewed as a step margin that protrudes further left and right from the protruding end of the upper tread. Therefore, when the operator gets into the driver's seat of the load roller, the operator can reliably step on each step without stepping on the upper step board. Also, when getting off the driver's seat, the operator can step on the tread of each step without stepping off the lower step.

Further, according to the present invention, the rear end portion of each tread plate is formed in a staircase shape in which the position of the rear end is sequentially shifted forward from the lower step side toward the upper step side. It can be seen as a step margin that projects further forward from the rear end. Therefore, when getting on and off the driver's seat using the stepping board as a foothold, the operator can surely step on the stepping board of each step while visually checking the stepping board to be stepped on next. Moreover, even when it is difficult to secure sufficient space for getting on and off in the left and right directions of the vehicle, for example, when paving work on narrow roads, the operator can use the step for getting on and off as a foothold. The driver can get on and off the driver's seat from the front and rear of the vehicle.

Claims

The scope of the claims

1. A vehicle body in which front and rear compaction rollers are rotatably provided, a driver seat provided on a floor plate of the vehicle body, and a vehicle seat provided on a side surface of the vehicle body for getting on and off the driver seat. In the load roller consisting of steps for getting on and off,

The step for boarding and dismounting comprises a plurality of steps provided so as to protrude leftward and rightward from the side of the vehicle body, and each of the steps is formed by projecting a lower step side from the side of the vehicle body. A load roller having a large length and a step-like configuration in which a projecting length from a side surface of the vehicle body gradually decreases toward an upper side.

2. The vehicle body includes a front vehicle body in which a front roller is rotatably provided, and a rear vehicle body connected to the front vehicle body and having a rear roller in a rotatable manner. The load roller according to claim 1, wherein the step for getting on and off is provided on the front vehicle body.

3. The load roller according to claim 1, wherein each of the treads has a stepped shape in which a position of a rear end portion is sequentially shifted forward from a lower side toward an upper side.

4. The mouth according to claim 1, 2, or 3, wherein the step board of each step constituting the step for getting on and off is provided with a transparent opening for seeing a road surface from above a floor plate of the vehicle body. One roller.

5. A fuel tank or hydraulic oil tank is provided on the side of the vehicle body, and at least a plurality of steps located at least on the lower side of the steps constituting the steps for getting on and off are provided. The load roller according to claim 1, 2 or 3, wherein the tread is fixedly provided on a side surface of the tank.

6. The driver's seat is provided on the floorboard of the vehicle body at two positions separated in the left and right directions, and the step for getting on and off is provided on each of the left and right side surfaces of the vehicle body. The loader described in 1, 2, or 3.

7. The handrail is provided on one side or both sides in front and rear of the step for getting on and off and extends upward and downward, and the lower end of the handrail is lower than the floorboard of the body. The roller according to claim 1, 2 or 3, wherein the roller also extends downward.

8. The vehicle body includes a front vehicle body in which a front rolling roller is rotatably provided, and a rear vehicle body connected to the front vehicle body and in which a rear rolling port is rotatably provided. The front vehicle body is provided with handrails extending upward and downward on both sides in front of and behind the step for getting on and off, and the handrail on the front side is provided with a handrail roller on the front side. The lower handrail extends below the floor plate of the front vehicle body between the boarding steps and the handrail on the rear side is between the connecting section between the front vehicle body and the rear vehicle body and the boarding steps. 2. The mouth roller according to claim 1, wherein the roller extends below a floor plate of the front body. 3.

9. A notch is provided in a portion of the floor panel of the vehicle body corresponding to the step for getting on and off, and the floor panel is provided between an open position where the notch is opened and a closed position where the notch is closed. The load drawer according to claim 1, 2 or 3, wherein the loader is configured to have a movable movable floor plate.

10. An overhanging portion is provided on the floor panel of the vehicle body at least on the side where the step for boarding and dismounting is provided, and the overhanging portion extends beyond the side surface of the vehicle body. Is provided with a notch at a position corresponding to the step for getting on and off, and the notch is provided on the floor plate. 4. The low drawer according to claim 1, 2 or 3, wherein a movable floor plate is provided which moves between an open position for opening the closed part and a closed position for closing the closed part.

1 1. A notch is provided in a portion of the floorboard of the vehicle body corresponding to the step for getting on and off, and the floorboard is provided between the open position where the notch is opened and the closed position where the notch is closed. 4. The load roller according to claim 1, wherein a movable floor plate is provided, and an operation member for opening and closing the movable floor plate is provided on the movable floor plate.

12. The operating member allows the board to get on and off between the floor board and the step for getting on and off when the movable floor board is in the open position, and when the movable floor board is in the closed position, 12. The load roller according to claim 11, wherein the load roller is a gate lock lever for prohibiting getting on and off between the step and the step for getting on and off.

13. The vehicle body is provided with handrails that extend upward and downward on one side or both sides in front of and behind the step for getting on and off, and the lower end of the handrail is the vehicle body. A notch is provided in a portion of the floorboard of the vehicle body corresponding to the step for getting on and off, and the notch is opened in the floorboard. The movable floor plate that moves between a position and a closed position to be closed is provided, and the movable floor plate is provided with an operation member that opens and closes the movable floor plate. Load rollers.

14. The vehicle body is provided with a detecting means for detecting that the movable floor plate is in the open position or the closed position, and the roller driving device for driving the pressure roller is provided with the detecting means. 10. The load roller according to claim 9, further comprising: a driving force reducing unit configured to reduce a driving force of the pressure roller when the movable floor plate is detected to be in an open position.

15. The roller driving device includes a variable displacement hydraulic pump driven by a prime mover and having a variable capacity portion, and a pressure pump supplied and discharged from the hydraulic pump. The hydraulic motor is rotated by rotating a roller, and the hydraulic pump is tilted by changing the displacement of the hydraulic pump in response to the displacement of a piston that defines two oil chambers in the cylinder. A tilting mechanism for rotating the motor forward or reverse, and a tilting mechanism provided in the middle of a pipeline connecting the tilting mechanism and a pilot hydraulic pressure source; A directional control valve for switching the rotation of the hydraulic motor between forward and reverse by switching the direction of pressure oil supplied and discharged overnight.

The driving force reducing means may be provided between two pipes connecting between the direction switching valve and each of the oil chambers of the tilting actuator or between the oil chambers of the tilting actuator. A bypass pipe connected and provided; and a bypass pipe provided in the middle of the bypass pipe, wherein the detecting means detects that the movable floor plate has reached an open position. 15. The load port roller according to claim 14, further comprising an opening / closing valve that opens the path and closes the bypass pipe when detecting that the path has reached the closed position.

16. The roller driving device includes a variable displacement hydraulic pump driven by a prime mover and having a variable capacity portion, and a pressure pump supplied and discharged from the hydraulic pump. A hydraulic motor for rotating the rollers, and a tilting for rotating the hydraulic motor forward or backward by tilting the variable capacity portion of the hydraulic pump in response to pressure oil supplied and discharged from the outside. The hydraulic oil is provided in the middle of the pipeline connecting the actuator and the hydraulic pressure source, and is supplied and discharged during the inclination. By switching the direction, the hydraulic And a directional control valve that switches the evening rotation between forward and reverse rotations.

The driving force reducing unit is provided in the middle of the pipeline at a position upstream of the direction switching valve, and detects that the movable floor plate has reached the open position by the detecting unit. In some cases, the pressure oil in the tilting actuator is released, and when the closed position is detected, the on-off valve that supplies the pressure oil to the tilting actuator is released. 15. The load roller according to claim 14, wherein the load roller is configured.

17. The roller driving device is configured such that the roller is driven by a prime mover and has a variable displacement type hydraulic pump having a variable displacement portion, and a pressure oil lined and discharged from the hydraulic pump. A hydraulic motor that rotates the rollers, and a parking brake that applies braking power to the hydraulic motor when parking and releases the braking force when the hydraulic motor is operating.

The driving force reducing means is provided in the middle of a brake pipeline for supplying pressure oil for releasing brakes to the parking brake, and when the detecting means detects that the movable floor plate has reached the open position. Claim 14 comprising an on-off valve for releasing the pressure oil in the parking brake and supplying the pressure oil to the parking brake when it is detected that the parking brake has come to the closed position. The load roller described in.

18. A vehicle body in which the front and rear pressure rollers are rotatably provided, a driver seat provided on a floor plate of the vehicle body, and a driver seat provided on a side surface of the vehicle body for getting on and off the driver seat. In the mouth-drawer consisting of the steps for getting on and off,

The vehicle body is provided with handrails extending upward and downward at one side or both sides in front of and behind the step for getting on and off, and a lower end of the handrail is provided with a floor plate of the vehicle body. To the bottom A load roller characterized in that it is configured to extend.

19. A vehicle body provided with rotatable front and rear pressure rollers, a driver seat provided on a floor plate of the vehicle body, and a side surface of the vehicle body for getting on and off the driver seat A load roller comprising a step for getting on and off provided in

A notch is provided in a portion of the floor panel of the vehicle body corresponding to the step for getting on and off, and the floor panel is movable between an open position in which the notch is opened and a closed position in which the notch is closed. A load roller provided with a floor plate, and an operation member for opening and closing the movable floor plate is provided on the movable floor plate.

Claims of amendment

[26 January 2000 (26.0.100) Accepted by the International Bureau: Claims 27, 18 and 19 originally filed have been withdrawn; Ranges 1, 4 1 6, 8 — 1 1 '1 1 1 4 have been amended; other claims remain unchanged. (Page 5)]

1. (after correction) a front vehicle body in which the front roller is rotatably provided, a rear vehicle body connected to the front vehicle and the rear roller is rotatably provided, A mouth drawer comprising: a driver seat provided on a floor plate of the front vehicle body; and a step-on / off step provided on a side surface of the front vehicle body for getting on / off the driver seat.

The step for getting on and off comprises a plurality of steps provided so as to protrude leftward and rightward from the side surface of the front vehicle body. The length of the protrusion is large, and the length of the protrusion from the side surface of the front vehicle body is gradually reduced toward the upper side in a step-like shape.

The front vehicle body is provided with a handrail which is located on one side or both sides in front and rear of the step for getting on and off and extends upward and downward, and a lower end side of the handrail is lower than a floor plate of the front vehicle body. The mouth drawer is characterized in that it also extends downward.

2. (Delete)

3. The mouth-drawing machine according to claim 1, wherein each of the treads has a step-like shape in which a position of a rear end portion is sequentially shifted forward from a lower side toward an upper side.

4. (After Correction) The tread of each step constituting the step for getting on and off is provided with a see-through opening through which a road surface can be seen from above a floor plate of the front vehicle body. The mouth of the mud.

5. (After correction) A fuel tank or hydraulic oil tank is provided on the side of the front vehicle body, and is located at least on the lower side of the treads of each step constituting the step for getting on and off. Multiple

55

Amended paper (Article 19 of the Convention) 4. The mouth drawer according to claim 1, wherein the step board of the step is fixedly provided on a side surface of the tank.

6. After the correction, two driver seats are provided on the floor panel of the front vehicle body, separated from each other in the left and right directions, and the steps for getting on and off are provided on the left and right side surfaces of the front vehicle body, respectively. The mouth-drawing device according to claim 1 or 3, wherein

7 (deleted)

8. (After correction) The handrail is provided on both sides in front of and behind the step for getting on and off, and the handrail on the front side is placed between the front rolling roller and the step for getting on and off. The rear handrail extends below the floor plate of the front vehicle body between the connecting portion between the front vehicle body and the rear vehicle body and the step of getting on and off. 2. The mouth-drawing device according to claim 1, which is configured.

9. After the correction, a cutout portion is provided in a portion of the floorboard of the front vehicle body corresponding to the step for getting on and off, and the cutout portion is provided on the floorboard between an open position and a closed position where the cutout portion is closed. 4. The load roller according to claim 1, wherein a movable floor plate is provided.

10. (After Correction) At least on the side of the floor panel of the front vehicle body on which the step for getting on and off is provided, a projection is provided which extends beyond the side surface of the front vehicle body. The notch portion is provided at a position corresponding to the step for getting on and off, and the floor plate is provided with a movable floor plate that moves between an open position and a closed position where the notch portion is opened. Is the mouth drawer described in 3.

1 1. (After correction) A notch is provided in a portion of the floor panel of the front body corresponding to the step for getting on and off, and the floor panel has an open position and a closed position where the notch is opened. Among

56 Amended paper (Article 19 of the Convention) 4. The mouth-drawer according to claim 1, wherein a movable movable floor plate is provided, and the movable floor plate is provided with an operation member for opening and closing the movable floor plate.

12. The operating member allows the user to get on and off between the floor plate and the step for getting on and off when the movable floor plate is in the open position.

12. The mouth drawer according to claim 11, wherein the gate drawer is a gate lock lever that prohibits getting on and off between the floor plate and the step for getting on and off when the movable floor plate is in the closed position.

13. (After correction) The handrail is provided on both sides before and after the step for getting on and off, and the handrail on the front side is placed between the front rolling roller and the step for getting on and off. The rear handrail extends below the floorboard of the vehicle body between the connecting portion between the front vehicle body and the rear vehicle body and the step for getting on and off, and extends below the floorboard of the vehicle body. A notch is provided in a portion of the floorboard of the front vehicle body corresponding to the step for getting on and off, and the floorboard is movable between an open position and a closed position where the notch is opened. 4. The loader according to claim 1, wherein a floor plate is provided, and the movable floor plate is provided with an operation member for opening and closing the movable floor plate.

14. (After Correction) The front vehicle body is provided with detecting means for detecting that the movable floor plate has reached the open position or the closed position, and the roller driving device for driving the pressure roller is provided with: The load roller according to claim 9, further comprising a driving force reducing unit configured to reduce a driving force of the pressure roller when the movable floor plate is at the open position. One la.

15. The roller driving device is a variable displacement hydraulic pump driven by a prime mover and having a variable displacement portion;

57 Amended paper (Article 19 of the Convention) A hydraulic motor that rotates the pressure roller by pressure oil supplied and discharged from the pressure pump, and a capacity of the hydraulic pump according to displacement of a piston that defines two oil chambers in the cylinder. A tilt function that rotates the hydraulic motor in the normal or reverse direction by tilting the variable part, and a pipe line connecting the tilt function and the pilot hydraulic power source. A direction switching valve for switching the rotation of the hydraulic motor between forward and reverse by switching the direction of pressure oil supplied and discharged during the tilting function.

The driving force reducing means is provided between two pipe lines connecting between the direction switching valve and each oil chamber of the tilting actuator, or provided between the two oil chambers of the tilting actuator. A bypass pipe provided in the middle of the bypass pipe, and when the detecting means detects that the movable floor plate has reached an open position, the bypass pipe is opened and a closed pipe is opened. 15. The mouth drawer according to claim 14, comprising an opening / closing valve that closes the bypass pipe when the pressure is detected.

16. The roller driving device is configured to rotate the pressure roller by a variable displacement hydraulic pump driven by a prime mover and having a variable capacity portion, and pressure oil supplied and discharged from the hydraulic pump. A hydraulic motor, a tilt function that rotates the hydraulic motor forward or reverse by tilting a variable capacity portion of the hydraulic pump in accordance with pressure oil supplied and discharged from the outside; The hydraulic motor is provided in the middle of the pipeline connecting the factory and the pilot hydraulic pressure source, and by switching the direction of the pressure oil discharged to the tilting actuator, A directional control valve that switches between forward and reverse rotation.

58 Amended paper (Article 19 of the Convention) The driving force reducing means is provided in the middle of the pipeline at a position upstream of the direction switching valve, and is provided when the detecting means detects that the movable floor plate has reached the open position. 15. The valve according to claim 14, further comprising an on-off valve for releasing the pressure oil within the tilting actuator and supplying the pressure oil to the tilting actuator when the closed position is detected. Mouth drawer described in.

17. The roller driving device is a variable displacement hydraulic pump driven by a prime mover and having a variable displacement section, and the pressure roller is rotated by pressurized oil discharged from the hydraulic pump. A hydraulic motor that rotates the vehicle, and a parking brake that applies braking power to the hydraulic motor during parking and releases a braking force when the hydraulic motor operates.

The driving force reducing means is provided in the middle of a brake pipe for supplying pressure oil for releasing the brake to the parking brake, and the detecting means detects that the movable floor plate has reached the open position. Claim 1 comprising an on-off valve for releasing the pressure oil in the parking brake and for supplying the pressure oil to the parking brake when it is detected that the parking brake is closed. The mouth drawer described in 4.

1 8. (Deleted)

1 9. (Deleted)

59

Amended paper (Article 19 of the Convention) Description based on Article 19 of the Convention The present invention combines claims 1 and 2 with claim 1 and is a reflex-type single-door vehicle consisting of a front vehicle and a rear vehicle. The step board of the step-on / off step provided on the side of the front vehicle body has a stair-like configuration in which the protruding length gradually decreases from the lower side to the upper side. It has handrails that extend upward and downward along the steps for getting on and off, and these handrails extend below the floorboard of the front vehicle body. Clarified.

On the other hand, JP, 61-20992, and Y2 form the front of the front frame 1 in a step-like manner, and the handrail 6 is attached to the side frame 5 thereof. The arrangement is different from the arrangement of the getting on / off steps according to the present invention. The elevating ladder 5 for getting on and off the cockpit 2 is arranged vertically, does not have a staircase shape, and has no handrail.

JP, 5 4-1 8 0 5 2 4, U is a step-like connection between step 6 at the lower end of the side frame 3 and step 22 on the side of the fuel tank 20. It is composed of However, this reference does not have to be a reflex type mouth-drawer, but rather extends below the floor along steps 6 and 22. The composition of the handrail is not disclosed.

JP, 56-51 649, U was cited for claim 4, but in this cited example, a grid-like footrest 14 is attached to the step table 11. It merely describes the configuration for providing the information, but has no relevance to the present invention.

JP, 57 — 1 1 3 2 0 0, U was cited in claims 9 to 13, 19, but this example is foldable on step 11 for getting on and off Fork clear with auxiliary floor 13 The foot is described. However, in this cited example, instead of the load roller as in the present invention, a step-like step-on / off step and a handrail configuration are used. It is not described.

JP, 3-24 690, Y 2 was cited in claims 14 to 17, but this reference cited that the operator was seated in driver's seat 7. However, only a safety device that allows the pedal to be operated by communicating the switching valve 2 is described. Compared with the present invention, the safety device is irrelevant to the configuration of the movable floor plate and the driving force reducing means. is there .

Claims 2 and 7 were deleted because they merged with claim 1. Claims 18 and 19 have been excluded from the relationship with claim 1 after the amendment. Claims 4, 5, 6, 8, 9, 9, 10, 11, 13, and 14 have been amended in connection with the amendment of claim 1.