JPH10219747A - Pedal locking device for construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of a malfunction due to throttle-valve opening, etc., and operation instability due to short oil pressure at the time of composite operation, to reduce the fatigue of an operator while simply mounting and demounting a device without additional works, to maintain the locking and release of the throttle pedal stably and to adjust a fixed opening at a desired angle. SOLUTION: The pedal locking device is installed to a throttle pedal 1 for the construction equipment rotated while using the heel side as a support. A support member 2 set up on the heel side nearer than a pedal support shaft in the throttle pedal 1 and a lock plate 4 rotatably set up to the support member 2 are fitted at that time, and the lock plate 4 is constituted so as to be able to take a lock place held between a throttle-pedal heel side 1a and a floor face F and a release place retreated from the section between the throttle-pedal heel side 1a and the floor face F.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of construction machines in which various attachments are mounted on, for example, an arm or the like, and more particularly to a pedal lock device for maintaining a throttle pedal at a predetermined opening.

[0002]

2. Description of the Related Art For example, in a general-purpose hydraulic excavator, an attachment most suitable for work is selected from various attachments for excavation work, structure cutting, and the like, and attached to the tip of an arm. The hydraulic line led to the tip of the is connected to the attachment, hydraulic fluid is supplied to the hydraulic cylinder, hydraulic motor, etc. of the attachment, and the hydraulic pressure of this hydraulic oil is determined by the opening of the throttle pedal in the driver's seat of the swivel. In addition to the adjustment, the arm, the attachment and the like are operated by the operation lever and the like.

[0003]

With respect to such a general attachment, for example, a lifting magnet applies a certain amount of hydraulic pressure to a hydraulic motor for driving a generator when an electromagnetic force is generated and a workpiece is continuously attracted. It is necessary to continue, and for that purpose, it is necessary to keep the opening of the throttle pedal at a predetermined opening or more. However, such an operation of keeping the opening of the throttle pedal at a predetermined opening or more causes fatigue of the operator.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional drawbacks, and an object of the invention is to provide a simple operation for opening the throttle pedal when the opening of the throttle pedal is maintained at a predetermined opening or more. An object of the present invention is to provide a pedal lock device for a construction machine capable of locking a degree of opening so as not to be less than a predetermined degree of opening and releasing it by a simple operation to reduce operator fatigue. Another object of the present invention is to easily attach and detach such a device without additional processing, to stably maintain the lock and release of the throttle pedal, and to adjust the predetermined opening to a desired angle. It is also intended to do so.

[0005]

A pedal lock device for a construction machine according to a first aspect of the present invention is a pedal lock device attached to a throttle pedal 1 of a construction machine that rotates about a heel side. A support member 2 attached to the heel side of the pedal support shaft, and a lock plate 4 rotatably provided on the support member 2 are provided. The lock plate 4 includes a throttle pedal heel side 1a, a floor surface F, And a release position retracted from between the heel side 1a of the throttle pedal and the floor surface F.

With this configuration, when the throttle pedal 1 is locked, if the lock plate 4 is turned to the lock position, the lock plate 4 is sandwiched between the heel side 1a of the throttle pedal and the floor surface F. Therefore, the throttle pedal 1 is locked by being supported by the lock plate 4 and does not become smaller than the predetermined opening. When the lock of the throttle pedal 1 is not required, if the lock plate 4 is rotated to the release position, the lock plate 4 is retracted from between the heel side 1a of the throttle pedal and the floor F, so that the throttle pedal 1 is released. Is done. The attachment and detachment of the support member 2 causes the pedal lock device to be attached to and detached from the throttle pedal 1.

According to a second aspect of the present invention, the support member 2 is a U-shaped clamp member that clamps the throttle pedal 1, and the clamping member adjusts the clamping force to apply a force to the throttle pedal 1. It is characterized in that attachment and detachment are performed.

With this structure, the support member 2 can be easily attached to and detached from the throttle pedal 1, and the throttle pedal 1 is not damaged.

According to the third aspect of the present invention, when the torque generated by the lock plate 4 at the lock position or the release position is equal to or less than a specified torque, the pedal lock device engages with the lock plate 4 or the support shaft 5 to lock the lock plate 4. Is temporarily provided at the lock position or the release position.

With this configuration, the lock plate 4 at the lock position or the release position does not rotate carelessly, and the lock or release of the throttle pedal 1 is stably maintained. When the lock plate 4 is rotated, the lock plate 4 is rotated from the lock position or the release position if the torque generated by the lock plate 4 exerts an operating force that exceeds the specified torque.

According to a fourth aspect of the present invention, there is provided a pedal lock device for a construction machine, wherein a turning radius of a tip of the lock plate is adjustable.

With this configuration, the lock plate 4
The distance between the heel side 1a of the throttle pedal and the floor F when the is in the lock position can be adjusted, so that the predetermined opening can be adjusted to a desired opening.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a specific embodiment of a pedal lock device for a construction machine according to the present invention will be described in detail with reference to the drawings. 1 and 2 are perspective views showing a pedal lock device according to one embodiment of the present invention. Here, a hydraulic excavator is assumed as the construction machine, but the present invention is not limited to this. The present invention is directed to all construction machines that may need to maintain the opening of the throttle pedal at a predetermined opening or more.

In FIGS. 1 and 2, reference numeral 1 denotes a throttle pedal provided around a driver's seat of a hydraulic shovel, which rotates around a pedal support shaft (not shown). When the operator puts his foot on the top, places his heel on the front side of the pedal support shaft, puts his toe on the other side, and steps on the toe with the heel as the fulcrum, the throttle pedal 1 falls forward and the opening increases. It has become.

A support member 2 is attached to the throttle pedal 1 on the heel side of the pedal support shaft.
The support member 2 is a U-shaped clamp member that clamps the throttle pedal 1, and has opposed tip portions 2 a,
2a, the throttle pedal 1 is fitted so as to sandwich it, and the bolt 2b screwed to the front end portion 2a on the back side is screwed forward and pressed against the throttle pedal 1 to relatively support the support member 2.
Is pushed away from the throttle pedal 1, whereby the holding force of the support member 2 is increased so that the support member 2 is securely attached to the throttle pedal 1. To remove the support member 2, the bolt 2b may be loosened. Reference numeral 3 denotes a cushion member sandwiched between the support member 2 and the throttle pedal 1, which is formed of a material having a high elasticity. The restoring force increases the holding force of the support member 2 and increases the frictional force. Although the support member 2 is securely fixed to the throttle pedal 1 by increasing the number, it is not always necessary. 2c is a lock nut.

A lock plate 4 is rotatably provided on the support member 2. That is, the lock plate 4
A plate support shaft 5 is fixed to the support member 2. The plate support shaft 5 is fitted in a cylindrical bearing member 6 fixed to the folded portion of the support member 2, and the lock plate 4 is connected to the throttle pedal heel side 1a. A locked position (a state shown by a phantom line in FIG. 2) between the driver's seat and the floor F, and a release position retracted from between the throttle pedal heel side 1a and the floor F (indicated by a solid line in FIG. 2). (The state shown).

As shown in FIG. 3, a disc spring 7 is contracted between the lock plate 4 and the bearing member 6. Further, a pin 8 is fixed to the distal end of the plate support shaft 5 extending outward from the bearing member 6, the pin 8 penetrating in the diameter direction and projecting at both ends, as shown in FIGS. 3 and 4. Notches 9a and 9b are formed in the end face of the bearing member 6 in two directions shifted by 90 degrees in the diameter direction, and when the lock plate 4 is in the lock position, the pin 8 is in the first notch 9a. The pin 8 is locked, and when in the release position, the pin 8 is locked in the second notch 9b. These members constitute a temporary fixing mechanism for temporarily fixing the lock plate 4 to the lock position or the release position when the torque generated by the lock plate 4 at the lock position or the release position is equal to or less than a specified torque.

Further, the lock plate 4 has a base portion 4a fixed to the plate support shaft 5, and a slide portion 4 attached to the base portion 4a by bolts and nuts 4c.
b. The bolt hole of the slide portion 4b is a long hole, and the turning radius of the tip of the lock plate can be adjusted by loosening the bolt and nut 4c and sliding the slide portion 4b.

With the above construction, when locking the throttle pedal 1, if the lock plate 4 is turned to the lock position, the lock plate 4 is clamped between the heel side 1a of the throttle pedal and the floor F. Therefore, the throttle pedal 1 is locked by being supported by the lock plate 4 and does not become smaller than the predetermined opening. When the lock of the throttle pedal 1 is not required, if the lock plate 4 is rotated to the release position, the lock plate 4 is retracted from between the heel side 1a of the throttle pedal and the floor F, so that the throttle pedal 1 is released. Is done. For this reason, it is possible to prevent erroneous operation at the time of a compound operation in which another lever or the like needs to be operated, and operation instability due to insufficient hydraulic pressure. Further, fatigue of the operator due to maintenance of the opening of the throttle pedal 1 can be reduced. In addition, since the operator can rotate to the lock position or the release position with his or her feet, it is easy to use.

Although the pedal lock device can be attached to and detached from the throttle pedal 1 by attaching and detaching the support member 2, when the support member 2 is used as a U-shaped clamp member for holding the throttle pedal 1, the pedal lock device is connected to the throttle pedal 1. The attachment / detachment of the support member 4 is simplified, and the throttle pedal 1 is not damaged.

Further, when the temporary fixing mechanism is provided, the lock plate 4 at the lock position or the release position does not rotate carelessly, and the lock or release of the throttle pedal 1 is stably maintained. When the lock plate 4 is rotated, if the torque generated by the lock plate 4 gives an operating force that exceeds the specified torque, the lock plate 4 is rotated from the lock position or the release position, so that the operability is good.

When the rotation radius of the tip of the lock plate is adjustable, the distance between the throttle pedal heel side 1a and the floor surface F when the lock plate 4 is in the lock position can be adjusted. The predetermined opening can be adjusted to a desired opening. Further, it can be used for any construction machine in which the above-mentioned intervals are set variously.

Next, a modification of the above embodiment will be described.
FIG. 5 shows a modification of the support member 2. In this support member 2, a through hole is formed in the throttle pedal 1 so that the bolt 2
b. In this way, the support member 2 is securely fixed to the throttle pedal 1, and the cushion member 3 is not required at all. 6 and 7 show a modification of the temporary fixing mechanism. In this temporary fixing mechanism, two notch holes 5 are provided so that the outer periphery of the plate support shaft 5 has a phase of 90 °.
a and 5b are recessed, and a housing hole 10 is formed in the inner wall of the bearing member 6, and the ball 11 is housed in this state while being urged inward by a spring 12, and the lock plate 4 is locked at the lock position. When the ball 11 is in the position, the ball 11 is fitted and locked in the first notch hole 5a, and when in the release position, the ball 11 is fitted and locked in the second notch hole 5b. The operation and effect are the same as those of the temporary fixing mechanism described in the above embodiment. In the above embodiment, the lock plate 4 is rotated around an axis parallel to the pedal support shaft of the throttle pedal 1. However, in the modification of FIG. 8, the lock plate 4 is rotated around an axis along the side end of the throttle pedal 1. The operation and effects similar to those of the above embodiment can be obtained.

[0024]

As described above, according to the pedal lock device for a construction machine according to the first aspect, when the opening of the throttle pedal is maintained at a predetermined opening or more, the opening of the throttle pedal can be controlled by a simple operation. The opening can be locked so as not to be less than the opening, and the unlocking can be performed by a simple operation, so that the fatigue of the operator can be reduced. Further, it is possible to reliably prevent the occurrence of malfunction due to opening of the throttle pedal and the like and the unstable operation due to insufficient hydraulic pressure during the combined operation. In addition, this pedal lock device can be freely attached to and detached from the throttle pedal, so that it has versatility. Furthermore, since the operator can rotate the lock position or the release position with his / her feet, it is convenient.

According to the second aspect, the pedal lock device can be easily attached to and detached from the throttle pedal without additional processing, and the throttle pedal is not damaged.

According to the third aspect, the lock or release of the throttle pedal can be stably maintained and the operability is good.

According to the fourth aspect, the predetermined opening degree can be adjusted to a desired angle, so that it can be used for various types of construction machines while expanding its applications.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a front view of the embodiment.

FIG. 3 is a view showing a main part of a cross section of the bearing member of the embodiment.

FIG. 4 is a diagram showing a tip of a plate support shaft of the embodiment.

FIG. 5 is a front view showing a modification of the support member.

FIG. 6 is a partial sectional view showing a modified example of the temporary fixing mechanism.

FIG. 7 is a cross-sectional view of a plate support shaft of the modification.

FIG. 8 is a front view showing a modification of the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Throttle pedal 1a Heel side 2 Support member 4 Lock plate 5 Plate support shaft F Floor surface

Claims (4)

[Claims] 1. A pedal lock device attached to a throttle pedal (1) of a construction machine that rotates on a heel side as a fulcrum, wherein the support member is attached to a heel side of a pedal support shaft of the throttle pedal (1). 2) and a lock plate (4) rotatably provided on the support member (2), and the lock plate (4) is provided between the throttle pedal heel side (1a) and the floor surface (F). A pedal lock device for a construction machine, wherein the lock position is sandwiched between the throttle pedal and a release position retracted from between the heel side (1a) of the throttle pedal and the floor (F). The support member (2) is a U-shaped clamp member for holding the throttle pedal (1), and the clamp member is attached to and detached from the throttle pedal (1) by adjusting the holding force of the clamp member. The pedal lock device for a construction machine according to claim 1, wherein: 3. When the torque generated by the lock plate (4) in the lock position or the release position is equal to or less than a specified torque, the lock plate (4) or the support shaft (5) is engaged to lock the lock plate (4). The pedal lock device for a construction machine according to claim 1 or 2, further comprising a temporary fixing mechanism for temporarily fixing the pedal at the position or the release position. 4. The pedal lock device for a construction machine according to claim 1, wherein a rotation radius of a tip end of the lock plate is adjustable.