JPH11321462A - Damage preventing device of step - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily ride on a step when an operator gets in and out of a driver's room by sideways and horizontally extending the step from an accommodated position neighboring to a side surface of a car body to a used position and interlocking with a braking operation of a parking brake to turn the step to the used position. SOLUTION: A step 4 for getting in and out of which a base end is pivotably mounted at a lower end portion of a car body 2 of a construction vehicle by a step pin 5 is turnable from an accommodated position A neighboring to a side surface 21 of the car body 2 to a used position B approximately horizontally extending to a side of the car body 2. When traveling of the construction vehicle is stopped and an operator gets out, the operator stamps a parking brake pedal to a braking position. So, a lever 14 is turned and a pull cable 12 for braking is drawn out to operate the parking brake 11 to become a braking state. Simultaneously, since a push cable 8 for a step is drawn out, the step 4 is turned to the used position B and abutted on a stopper 10 to be fixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a step damage prevention device for preventing damage to a step caused by a collision during traveling in a construction vehicle such as a wheel loader.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 4, a construction vehicle 1 such as a wheel loader has an operator's cab 3 on a vehicle body 2, and an operator enters and exits the operator's cab 3 on a side surface of the vehicle body 2. Step 4 for occasionally lifting and lowering is provided. Conventionally, this step 4 is arranged so as to extend from the side surface 21 of the vehicle body 2 to the side as shown in FIG. 5 and fixed to the vehicle body 2 by welding or bolts.

[0003] Since the construction vehicle 1 is used on a work site with many irregular terrain or obstacles, the step 4 often hits a projection or obstacle on the ground and breaks during traveling (particularly when turning).

Therefore, in order to prevent the step 4 from being damaged, as shown in FIGS. 6 and 7, the lowermost step 4 is provided so as to be suspended from the vehicle body by a rubber 55 or a wire 56. In step 4 described above, even if the rubber 55 or the wire 56 sways even if it hits a protrusion or an obstacle on the ground, damage can be prevented.

[0005]

However, when the step 4 swings as described above, there is a problem that when the operator goes up and down because of entering and exiting the cab 3, his feet are unstable and it is difficult to ride.

SUMMARY OF THE INVENTION The present invention solves the above-described problem in the step of elevating a construction vehicle, which can prevent the step from being damaged due to a collision during traveling, and also allows the operator to enter and exit the cab. It is an object of the present invention to provide a step breakage prevention device that can make it easy to ride on a step when moving up and down.

[0007]

According to the device for preventing breakage of a step of the present invention, in a construction vehicle, a step for raising and lowering is extended substantially horizontally from a storage position close to a side surface of a vehicle body to a side of the vehicle body. Step rotating means is provided which is pivotally provided to the position and which rotates the step to the use position in conjunction with the braking operation of the parking brake.

[0008] When the construction vehicle is running, the steps are held in the storage position close to the side surface of the vehicle body, so that the steps do not collide with protrusions or obstacles on the ground and do not break.
When the construction vehicle stops traveling and gets off, the operator operates the parking brake to the braking side. Then, in conjunction with this operation, the step rotating means rotates the step to the use position.

When the parking brake is actuated and in a braking state, the step is in a use position extending substantially horizontally to the side of the vehicle body, so that the operator can easily move up and down using the step.

When the traveling of the construction vehicle is resumed, the operator releases the parking brake after getting on the vehicle. Then, in conjunction with this release operation, the step moving means returns the step to the storage position. Therefore, the step can run without colliding with a protrusion or obstacle on the ground.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a front view of a step damage prevention device according to an embodiment of the present invention, FIG. 2 is a side view of the step damage prevention device, and FIG. 3 is a description of a parking brake operating mechanism. FIG.

The lifting step 4 has a base end pivotally connected to a lower end of the vehicle body 2 of the construction vehicle with a step pin 5, and is located at a storage position (close to the side surface 21 of the vehicle body 2). A) is rotatable to a use position (B) extending substantially horizontally to the side of the vehicle body 2. At the lower end of the vehicle body 2, a stopper 10 for stopping the step 4 at the use position (B) is provided.

The upper step 40 provided above the storage position (A) of step 4 has no risk of colliding with a protrusion or obstacle on the ground during traveling. It is fixed.

A spring 6 is mounted between the step 4 and the vehicle body 2.
Step 4 is always held at the storage position (A). The step 4 includes an arm 7 for rotation. One end of a push-pull cable 8 for a step is connected to the arm 7,
The other end of the step push-pull cable 8 is connected to a step cable connecting piece 9.

The construction vehicle has a parking brake 11. The parking brake 11 has a brake pull cable 12
Is connected, and the other end of the pull cable for brake 12 is connected to a cable connecting piece 13 for brake.

The step cable connecting piece 9 and the brake cable connecting piece 13 are fixed to the base end of a lever 14 which is pushed down by a pin 16 and turned when the parking brake pedal 15 is depressed. The push-pull cable 8 for brakes and the pull cable 12 for brakes are both operated to the pull side when the parking brake pedal 15 is depressed.

The base end of the parking brake pedal 15 is provided with teeth 18 that mesh with the pawls 17. When the parking brake pedal 15 is depressed to the braking position, the teeth 18 are fixed by the pawls 17 and the parking brake The pedal 15 is held in the braking position.

The pawl 17 is provided with a release lever 19, to which one end of a brake release push-pull cable 20 is connected. The other end of the brake release push-pull cable 20 is connected to a parking brake release knob 22, and when the parking brake release knob 22 is pulled, the release lever 19 is operated and the teeth 1 of the pawl 17 are moved.
Release the engagement with 8. Then, parking brake pedal 1
5 is returned from the braking position to the release position by the return spring 23.

When the construction vehicle is running, the step 4 is held at the storage position (A) close to the side surface 21 of the vehicle body 2, so that even if the width of the step 4 is large, it may collide with a protrusion or obstacle on the ground. No damage occurs.

When the construction vehicle stops traveling and gets off, the operator depresses the parking brake pedal 15 to the braking position. Then, the lever 14 rotates, the brake pull cable 12 is pulled, and the parking brake 11 is operated to be in a braking state. At the same time, the step push-pull cable 8 is also pulled, so that the step 4 rotates to the use position (B) and abuts against the stopper 10 to be fixed.

When the parking brake 11 is operated to be in a braking state, the step 4 is fixed at a use position (B) extending substantially horizontally to the side of the vehicle body 2, does not swing, and can have a large width. Therefore, the operator can easily go up and down using step 4.

When the traveling of the construction vehicle is restarted, the operator pulls the parking brake release knob 22 after getting on the vehicle to return the parking brake pedal 15 from the braking position to the release position, and releases the parking brake 11. Then, the step push-pull cable 8 is also operated to the push side in conjunction with this release operation, so that the step 4 returns to the storage position (A) by the spring 6. Therefore, the vehicle can travel without colliding with the protrusions or obstacles on the ground in Step 4.

[0023]

As described above, the breakage prevention device for a step according to the present invention can prevent breakage of a step due to a collision during traveling even if the width of the step is large. In addition, when the operator goes up and down because the operator enters and exits the cab, his feet are stable and easy to ride.

Further, since the rotation of the step to the use position is interlocked with the braking operation of the parking brake, there is also an effect of preventing forgetting to apply the parking brake.

[Brief description of the drawings]

FIG. 1 is a front view of a step breakage prevention device according to an embodiment of the present invention.

FIG. 2 is a side view of the damage prevention device of the step.

FIG. 3 is an explanatory view of an operation mechanism of a parking brake.

FIG. 4 is a side view of a construction vehicle having conventional steps.

FIG. 5 is an explanatory view of a conventional step mounting state.

FIG. 6 is an explanatory view of a mounting state of a conventional step.

FIG. 7 is an explanatory view of a conventional step mounting state.

[Explanation of symbols]

 2 Body 4 Step 5 Step pin 6 Spring 7 Arm 8 Step push-pull cable 9 Step cable connection piece 10 Stopper 11 Parking brake 12 Brake pull cable 13 Brake cable connection piece 14 Lever 15 Parking brake pedal 17 Claw 18 Teeth 19 Release lever 20 Brake release push-pull cable 21 Side surface 22 Parking brake release knob

Claims (1)

[Claims] In a construction vehicle, a step for lifting and lowering is pivotally provided from a storage position close to a side surface of a vehicle body to a use position extending substantially horizontally to the side of the vehicle body, and a parking brake is provided. A step breakage preventing device comprising a step rotating means for rotating a step to a use position in conjunction with a braking operation.