JP2008077302A - Operation pedal device for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an operation pedal device for a construction machine wherein exchange between a one-way operation pedal and a two-way operation pedal is easy. <P>SOLUTION: This operation pedal device for the construction machine operating a work machine or a valve 10 controlling an attachment installed in the work machine by a foot of an operator has: a pedal installation member 15 pivotally mounted in the vicinity of the valve 10 by a pin 14, capable of changing over the valve 10 by turning with the pin 14 as the center; the one-way operation pedal 21 operated in a state that a heel is touched on a floorboard 5; and the two-way operation pedal 22 operated in a state that the whole foot is placed. The one-way operation pedal 21 and the two-way operation pedal 22 are exchangeably installed to the pedal installation member 15, and the exchange between the one-way operation pedal 21 and the two-way operation pedal 22 can be easily performed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a work machine and an operation pedal device for a construction machine that operates an attachment attached to the work machine.

Conventionally, a construction machine such as a hydraulic excavator is provided with an operation pedal for operating a work machine in addition to an operation pedal for operating the construction machine itself.
Normally, this type of operation pedal is installed in front of the driver's seat installed in the driver's cab, and the operator who sits in the driver's seat operates the operation lever with his / her hand while operating the operation lever. The operation of the machine itself and the operation of the work machine are all performed. As the types of operation pedals, for example, a two-way stepping type (seesaw type) described in Patent Document 1 and Patent Document 2 are disclosed. There is a one-way type that is described.
As shown in FIG. 6, the pedal operating device for a construction machine described in Patent Document 1 has an operating pedal b that rotates in the front-rear direction around a fulcrum a, and the entire foot c is attached to the operating pedal b. If the front end of the pedal b is stepped on with the toe of the foot c, the operating pedal b rotates forward around the fulcrum a, and the fulcrum a is In the center, the operation pedal b rotates backward.

Further, a valve d is provided below the operation pedal b, and the tip of the spool protruding upward from the valve d is in contact with a pedal mounting member (none of which is shown), and the fulcrum a is the center. As the operation pedal b is rotated in the front-rear direction, the spool is slid in the vertical direction, and the hydraulic circuit is switched by the valve d.
On the other hand, in the one-way depression type operation pedal device described in Patent Document 2, the rear end side of the pedal is pivotally mounted near the floor surface, and the front end side of the pedal is attached to the toe of the foot with a heel on the floor surface. When stepped on, the pedal rotates forward about the fulcrum.
A valve that protrudes upward from the spool is installed below the pedal, and the spool is slid in the vertical direction as the pedal rotates forward, and the hydraulic circuit is switched by the valve. ing.
Japanese Patent Laid-Open No. 2005-250995 Japanese Utility Model Publication No. 62-56481

The two-way stepping type operation pedal device described in Patent Document 1 is effective for an operation pedal that controls a plurality of operations, such as a traveling pedal that moves the traveling body of a construction machine forward and backward, but the entire foot c Is placed on the operation pedal b and operated, and there is a problem that the operator is likely to get tired if used for a long time.
In addition, when the object operated by the operation pedal b is, for example, a hydraulic breaker mounted as an attachment to the work machine, since the on / off control is performed, a stopper e that prevents the operation pedal b from rotating backward is provided. Although it is attached to the lower rear part of the pedal b as shown in FIG. 6, even in this case, it is necessary to place the entire foot c on the operation pedal b and operate it. .

On the other hand, the one-way stepping type operation pedal described in Patent Document 2 can operate the pedal with the heel on the floor surface. Has the advantage of less fatigue.
However, there are two types of operation pedals for operating the work implement: those operated by the two-way operation pedal and those operated by the one-way operation pedal. In order to replace the one-way operation pedal described in Document 2, not only the operation pedal but also the entire valve must be replaced.
In addition, since many hydraulic pipes are connected to the valve, when replacing the valve, it is necessary to change the hydraulic arrangement, etc., and it takes a lot of time and labor to replace the operation pedal. There is a problem such as lowering the operating rate.
The present invention has been made to remedy such a problem, and an object thereof is to provide an operation pedal device for a construction machine in which a one-way operation pedal and a two-way operation pedal can be easily exchanged.

  An operation pedal device for a construction machine according to the present invention is an operation pedal device for a construction machine that operates a work machine or a valve for controlling an attachment attached to the work machine with an operator's foot. Pedal attachment member that is pivotally attached and can be switched by rotating around the pin, one-way operation pedal that operates with the heel on the floor, and operation with the entire foot placed The one-way operation pedal and the two-way operation pedal are interchangeably attached to the pedal attachment member.

With the above configuration, when performing work with an attachment such as a hydraulic breaker attached to the work implement, the unidirectional operation pedal is attached to the pedal attachment member so that the heel of the foot is attached to the upper surface of the floor board in one direction. The operation pedal can be operated by the operation pedal, so that the operator is less fatigued even when working for a long time, and the entire valve is removed when replacing the two-way operation pedal with the one-way operation pedal. Therefore, the replacement work can be performed in a short time, and this does not reduce the operating rate of the construction machine.
In addition, when modifying an existing operation pedal device, since only a small scale modification such as newly producing a pedal attachment member and a one-way operation pedal and a two-way operation pedal is required, it can be implemented at a low cost. Since the installation space is almost the same as the existing one, it can be easily implemented.

  In the operation pedal device for a construction machine according to the present invention, the one-way operation pedal is composed of a pedal member and a pedal bracket, and an angle adjusting means for adjusting the angle of the pedal member is provided between the pedal member and the pedal bracket. It is a thing.

  With the above configuration, when the pedal is changed from the two-way operation pedal to the one-way operation pedal, the angle of the pedal member can be adjusted to an angle that is easy for the operator to operate. Operator fatigue can be further reduced during time work.

  According to the operation pedal device of the construction machine of the present invention, by attaching the one-way operation pedal to the pedal mounting member, the one-way operation pedal is operated in a state where the foot of the foot is attached to the upper surface of the floor board, and the work by the attachment is performed. Since it can be performed for a long time, the operator is less likely to get tired, and even when changing from a two-way operation pedal to a one-way operation pedal, there is no need to remove and replace the entire valve. Can be performed in a short time, and the operating rate of the construction machine is not reduced.

An embodiment in which the present invention is applied to a construction machine such as a hydraulic excavator will be described in detail with reference to the drawings.
FIG. 1 is a perspective view of a driver's cabin in which an operation pedal device is installed, FIG. 2 is a side view of the operation pedal device, FIG. 3 is an exploded side view with a part cut away, and FIG. FIG. 5 is an exploded side view with a part cut away.
A driver's cab 1 of a hydraulic excavator shown in FIG. 1 has a seat 2 on which an operator (not shown) is seated, and left and right operation levers 4 are provided in front of armrests 3 provided on both sides of the seat 2. It has been.
These operating levers 4 are used to operate a turning body installed on the traveling body and a working machine (both not shown). A pair of traveling pedals 6 are placed on the floor plate 5 in front of the seat 2. For example, an operation pedal device for operating an attachment (not shown) such as a hydraulic breaker mounted on the work machine and a pair of travel operation levers 8 provided on the floor board 5 are provided.
The traveling pedal 6 and the traveling operation lever 8 are mechanically interlocked under the floor so that either the traveling pedal 6 or the traveling operation lever 8 can perform a forward / backward movement operation and a steering operation of the traveling body.

The left and right traveling pedals 6 are existing two-way operation pedals, and are operated by placing the entire foot on the traveling pedal 6, and the operation pedal device for operating the attachment with the feet is provided. When the vehicle is operated, the traveling operation of the traveling body can be performed while operating the work implement by operating the traveling operation lever 8 by hand.
The operation pedal device of the present invention installed so as to be adjacent to the traveling pedal 6 is located above the valve 10 installed below the floor plate 5 of the cab 1 as shown in FIGS. .
The valve 10 is composed of, for example, a pilot valve that switches a pilot circuit. The valve 10 and the operation pedal device are unitized, and the unit board 11 is attached to the floor plate 5 together with the plurality of fixing members 12 so that the operation plate device can be detached from the floor plate 5. A high-pressure hose (not shown) is used for the hydraulic piping around the valve 10 so as not to cause trouble when the unit is detached.
A flange 10 a protruding from the valve 10 is attached to the unit board 11 by a fixing tool 12. A bracket 13 is fixed to the upper surface of the flange 10 a, and a pedal mounting member 15 is attached to the bracket 13 by a pin 14. It is pivotally attached in the front-rear direction.

As shown in FIG. 3, the pedal attachment member 15 has inclined surfaces 15 a that are symmetrical with respect to the pin 14, and the tip ends of a pair of spools 10 b that protrude upward from the valve 10 on these inclined surfaces 15 a. A bellows-like boot 16 which is abutted from below and has a peripheral portion except for the upper surface of the pedal mounting member 15 formed of an elastic body such as rubber in order to prevent dust and the like from adhering to the pin 14 and the spool 10b. Covered by.
The unit substrate 11 is attached to the operation pedal attachment plate 18 from below by a plurality of fixing tools 17.
The operation pedal mounting plate 18 is attached to the upper surface of the floor plate 5 so as to cover an opening (not shown) opened in the floor plate 5, and a fixing tool (which attaches the operation pedal mounting plate 18 to the floor plate 5 ( The entire unit can be removed from the floor board 5 by removing the (not shown).

An operation pedal body 20 is detachably attached to the upper surface of the pedal attachment member 15 by a plurality of fixing tools 19.
The operation pedal body 20 includes a one-way operation pedal 21 shown in FIGS. 2 and 3 and a two-way operation pedal 22 shown in FIGS. 4 and 5 and can be exchanged depending on the application.
As shown in FIG. 3, the one-way operation pedal 21 includes a pedal member 21a and a pedal bracket 21b. The pedal member 21a is formed of a rectangular plate that is elongated in the front-rear direction. 5 It is formed in such a size that almost the entire sole can be placed in a state of being worn on the upper surface.
A rib 21c protrudes from the back surface of the pedal member 21a along the front-rear direction. An angle adjusting means 24 is provided between the front side of the rib 21c and the pedal bracket 21b, and from the center of the rib 21c. A mounting hole 21d is formed slightly rearward.

The pedal bracket 21b includes a base 21e whose lower surface is detachably attached to the upper surface of the pedal mounting member 15 by a plurality of fixing tools 19, and a support plate 21f fixed to the base 21e by a pair of fixing tools 23. The front end side of the support plate 21f protrudes obliquely forward.
An attachment hole 21d drilled in the rib 21c of the pedal member 21a is inserted into the fixing member 23 that fixes the rear side of the support plate 21f to the base 21e, and the tip of the pedal member 21a is centered on the fixing member 23. The side of the pedal member 21 a can be freely rotated in the vertical direction, and the angle of the pedal member 21 a can be adjusted by the angle adjusting means 24.
The angle adjusting means 24 finely adjusts the angle of the pedal member 21a to a position that is easy for the operator to operate, and as shown in FIG. 3, a long hole 24a formed on the front side of the rib 21c protruding from the pedal member 21a. And a pin hole 24c drilled slightly rearward from the front end portion of the support plate 21f, and a long hole 24a and a fixing tool 24b inserted into the pin hole 24c. A method for adjusting the angle of the pedal member 21a will be described later.

On the other hand, on the upper surface of the front portion of the operation pedal mounting plate 18, stopper means 25 for fixing the rotation of the pedal member 21a is installed.
The stopper means 25 includes a fixed bracket 25a fixed on the operation pedal mounting plate 18, a lever 25c whose lower end is pivotally attached to the fixed bracket 25a by a pin 25b, and a toggle spring 25d that urges the lever 25c in the front-rear direction. Consists of.
The lever 25c is formed of a rectangular plate body, and its upper end is rotatable about the pin 25b from the solid line position shown in FIG. 2 to the position shown by the phantom line, and is almost in the middle of the lever 25c. A toggle spring 25d is stretched between the protruding locking pin 25e and pin 25b.
A stopper rod 25f protrudes from the upper end side of the lever 25c in a direction parallel to the pin 25b. When the lever 25c is rotated to the phantom line position in FIG. It engages with the formed notch 21g, and thereby the rotation of the one-way operation pedal 21 can be fixed, and the lever 25c is rotated with a foot at the tip of the stopper rod 25f. An operation piece 25g to be operated is fixed.

On the other hand, the two-way operation pedal 22 shown in FIG. 4 and FIG. 5 is a pedal member formed by bending a rectangular plate having a length and a width on which an operator's entire foot can be placed into a substantially reverse shape. 22a, a support plate 22b protruding from the back surface of the pedal member 22a, and a pedal bracket 22c that supports the pedal member 22a via the support plate 22b.
The pedal bracket 22c is detachably attached to the upper surface of the pedal attachment member 15 by a plurality of fixing tools 19, and the support plate 22b is fixed to the pedal bracket 22c by a pair of fixing tools 23. .
A notch 22d is formed at the tip of the support plate 22b, and the rotation of the two-way operation pedal 22 can be fixed by engaging the stopper rod 25f of the stopper means 25 with the notch 22d. It is like that.

Next, the operation of the construction pedal operating pedal device constructed as described above will be described.
From the state in which the work machine is operated using the two-way operation pedal 22 shown in FIG. 4, for example, a hydraulic breaker is attached to the work machine as an attachment, and the work is performed by operating the hydraulic breaker with the one-way operation pedal 21. In this case, first, the fixing tool 19 that fixes the two-way operation pedal 22 to the pedal attachment member 15 is loosened, and the two-way operation pedal 22 is removed from the pedal attachment member 15.
Next, when the pedal bracket 21b of the one-way operation pedal 21 is fixed to the pedal mounting member 15 by the fixing tool 23, the angle of the pedal member 21a is adjusted by the angle adjusting means 24.

That is, the one-way operation pedal 21 that is operated by putting the operator's foot heel on the upper surface of the floor board 5 is less operable when the pedal member 21a is not at an angle familiar to the operator, and causes fatigue. Therefore, the angle of the pedal member 21a is finely adjusted to a position that is easy for the operator to operate.
In the adjustment, among the two fixing tools 23 fixing the pedal member 21a to the pedal bracket 21b, the rear fixing tool 23 and the fixing tool 24b fixing the pedal member 21a to the support plate 21f are loosened, The upper end side of the pedal member 21a is rotated in the vertical direction around the rear fixing tool 23, and the angle of the pedal member 21a is finely adjusted.
The adjustment range at this time depends on the length of the long hole 24a formed in the rib 21c, but in the present embodiment, a total of 9 °, 4.5 ° upward and 4.5 ° downward from the neutral position. It is about.

When the angle adjustment of the pedal member 21a is completed as described above, the fixing members 23 and 24b are tightened to fix the pedal member 21a to the pedal bracket 21b, and then used for work. Since the one-way operation pedal 21 can be operated in a worn state to perform a crushing operation or the like using a hydraulic breaker, the operator is less likely to get tired even when working for a long time.
Further, when the operation is interrupted or finished, the operation piece 25g provided on the stopper rod 25f of the stopper means 25 is pulled toward the front with the toe of the foot, and the lever 25c is rotated rearward around the pin 25b, so that the stopper By engaging the flange 25f with the notch 21g of the support plate 21f as shown by the phantom line in FIG. 2, the rotation of the one-way operation pedal 21 can be fixed, so that the hydraulic breaker operates carelessly. Can be prevented.

On the other hand, when the work is performed by attaching an attachment for controlling the operation by the two-way operation pedal 22 instead of the hydraulic breaker to the work machine, the one-way operation pedal 21 is removed and the pedal bracket of the two-way operation pedal 22 shown in FIG. 22c is attached to the pedal attachment member 15.
Thus, the work can be performed by operating the attachment with the two-way operation pedal 22 by rotating the pedal member 22a in the front-rear direction with the entire foot placed on the pedal member 22a of the two-way operation pedal 22. become able to.
Further, when the operation is interrupted or ended, like the one-way operation pedal 21, the operation piece 25g provided on the stopper rod 25f of the stopper means 25 is pulled toward the front with the toe of the foot, and the lever is focused on the pin 25b. The two-way operation pedal 22 can be fixedly rotated by rotating the rear 25c and engaging the stopper rod 25f with the notch 22d of the support plate 22b.

In the above embodiment, the long hole 24a of the angle adjusting means 25 is formed in the rib 21c on the pedal member 21a side, but it may be provided on the support plate 21f on the pedal bracket 21b side.
Moreover, although the embodiment implemented in the hydraulic excavator has been described, the present invention can be applied to all construction machines that need to work by exchanging the one-way operation pedal 21 and the two-way operation pedal 22.

It is a perspective view which shows the operator's cab of the construction machine which installed the operation pedal apparatus which becomes embodiment of this invention. It is a side view in the state where a one-way operation pedal is mounted on the operation pedal device of the construction machine according to the embodiment of the present invention. It is a partially cutaway exploded side view of a state in which the one-way operation pedal is mounted on the operation pedal device of the construction machine according to the embodiment of the present invention. It is a side view of a state where a two-way operation pedal is attached to the operation pedal device of the construction machine according to the embodiment of the present invention. It is a partially cutaway exploded side view of a state in which a two-way operation pedal is attached to the operation pedal device of the construction machine according to the embodiment of the present invention. It is a side view which shows the operation pedal apparatus of the construction machine equipped with the conventional two-way operation pedal.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 Floor board 10 Valve 14 Pin 15 Pedal attachment member 21 One-way operation pedal 21a Pedal member 21b Pedal bracket 22 Two-way operation pedal 24 Angle adjustment means

Claims (2)

An operation pedal device of a construction machine that operates a work machine or a valve that controls an attachment attached to the work machine with an operator's foot, and is pivotally attached to the vicinity of the valve by a pin and centered on the pin A pedal mounting member capable of switching the valve by rotating it, a one-way operation pedal operated with a heel on the floor plate, and a two-way operation pedal operated with the entire foot placed And an operation pedal device for a construction machine, wherein the one-way operation pedal and the two-way operation pedal are attached to the pedal attachment member in a replaceable manner. The said one-way operation pedal comprises a pedal member and a pedal bracket, and an angle adjusting means for adjusting the angle of the pedal member is provided between the pedal member and the pedal bracket. Pedal device for construction machinery.

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