JPH08166833A - Stepping-in restriction device for operation pedal of work machine - Google Patents

Abstract

PURPOSE: To easily switch a restriction position for restricting the stepping-in operation of the operation pedal between a restricted state and an unrestricted position. CONSTITUTION: A swing lever 21 arranged below the rear part of the operation pedal 14 is swung for switching among the fully restricted state wherein the swing lever 21 interfers with the upper and lower pieces 20a and 20b of a restriction member provided on the side of the operation pedal 14 to restrict the both front and rear stepping-in operation of the operation pedal, a half-restricted state wherein the swing lever interfers with only the upper piece 20a to restrict the front stepping-in operation of the operation pedal, and the unrestricted state wherein the swing lever interfers with neither of the upper and lower pieces to allow the both front and rear stepping-in operation of the operation pedal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stepping-down restricting device for an operating pedal in a working machine provided with an operating pedal such as a hydraulic excavator.

[0002]

BACKGROUND OF THE INVENTION Generally,
Some working machines such as hydraulic excavators are configured so that the operation of the working unit is performed based on the stepping operation of an operation pedal arranged in front of the driver's seat. By the way, some of these operation pedals are used for attachments in addition to those used for general purposes, and the operation pedal should be locked when such an attachment is not installed or not used. In addition, even when the attachment is attached, the number of working part operations varies depending on the type of attachment, and therefore, for example, when only the front depression is possible or both front and rear depressions are possible. It is necessary to switch to and.

A mechanism shown in FIG. 9 has been conventionally proposed as a mechanism for performing such switching. In this structure, an operating pedal 14 is provided on the body side so that the pedal 14 can be rocked forward and backward with the swing axis 18a as the axis, while the pedal support frame 27 projecting on the body side is used for full regulation and semi-regulation. Through holes 27b and 27c are formed, and the pedal frame 16 of the operation pedal 14 is provided with through holes 16b for full regulation and long holes 16c for semi regulation, respectively, and If you want to restrict the front and rear operation of the pedal 14 to the fully restricted state, the restricting pin 28 is passed through the restricting through-holes 16b and 27b. Hole 27c and slot 16
When it is desired to penetrate the regulating pin 28 into c and enable the forward / backward stepping, the regulating pin 28 should be attached to the pedal support frame 27.
The storage holes 27a formed in the above are switched so as to be stored.

However, in this structure, the work of switching the penetration of the regulating pin 28 is troublesome and complicated, and the pin 28a for preventing the penetrating regulating pin 28 from coming off during vibration of the machine body, switching work, or the like. There is a fear that the screw 28b may come off or be lost, and when the chain 29 for connecting the regulating pin 28 to the pedal support frame 27 is broken, the regulating pin 28 itself may be lost. is there. Further, the work of inserting and removing the regulating pin 28 has been carried out at the front position of the pedal, but this position must be carried out in a narrow space in front of the cab, and there is a problem that the work is difficult and the workability is poor. .

[0005]

SUMMARY OF THE INVENTION The present invention was devised with the object of providing a stepping-down restricting device for an operating pedal in a working machine which can eliminate these drawbacks in view of the above-mentioned circumstances. In the working machine configured to operate the working unit based on the stepping operation of the operation pedal disposed in front of the driver's seat, the operation machine regulates the stepping operation of the operation pedal. The operating device member that can be swung between the restricted and non-restricted positions does not interfere with the operation member member in the non-restricted position but does not interfere with the operation member member in the restricted position for operation. It is characterized in that it is configured by using a regulating portion for regulating the swing of the pedal.

According to the present invention, with this structure, the switching operation of the restricting device for restricting the depression operation of the operation pedal can be easily performed.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a hydraulic excavator, which includes a crawler-type lower traveling body 2, an upper revolving body 3 which is rotatably supported above the lower traveling body 2, and an upper revolving body 3. It is composed of each part such as the working part 4 attached to the front part, and these parts are hydraulically operated based on the power of the engine, but the basic structure of each is the same as before.

The working unit 4 includes a boom 5 whose base end is pivotally supported by the upper revolving structure 3 so as to be vertically swingable, and an arm 6 which is pivotally supported by a tip end of the boom 5 so as to be swingable back and forth. The arm 6 further includes a bucket,
Various attachments such as a crusher, a grapple, and a hammer can be attached. As an example of such an attachment, the grapple 7 is attached in this embodiment.

On the other hand, 8 is a cab provided on the upper swing body 3, and inside the cab 8, left and right traveling levers 9R, 9L and a traveling pedal 10R for performing traveling operation of the lower traveling body 2 are provided. 10L, various hydraulic operating tools such as left and right control levers 11R and 11L for performing the swing operation of the upper swing body 3, the boom 5 and the arm 6, and various types such as the driver's seat 12 and the monitor panel 13 An operating device is provided, and an operating pedal 14 for operating a hydraulic actuator (not shown) for the grapple 7 is provided in front of the driver's seat 12, and the operating pedal 14 is provided. The present invention is implemented in.

The operation pedal 14 is formed of a member such as a pedal rubber 15 and a pedal frame 16. The bottom surface of the pedal frame 16 has a cab floor 1
7, the bottom surface of the pedal frame 16 is attached to the cab floor 17 on the upper surface of the valve assembly 18 which is mounted through the valve assembly 18.
It is fixed by bolts 18b in such a manner that it can be rocked back and forth around a rocking shaft core 18a as an axis so that a front stepping operation and a rear stepping operation can be performed from a neutral position which is substantially parallel to. A pilot valve (not shown) incorporated in the valve assembly 18 is switched in accordance with the forward / backward operation of the operation pedal 14, and the hydraulic oil for the hydraulic actuator for the grapple 7 is switched based on the switching operation. The hydraulic actuator is configured to be supplied and operate.

On the other hand, reference numeral 19 is a regulating device for regulating the depression operation of the operation pedal 14, and the regulation device 19 requires the depression operation of the operation pedal 14 instead of the grapple 7 as an attachment. If an attachment A (for example, a bucket that operates based on the operation of the control lever 11) is attached, or there is only one pilot valve switching operation part that can be switched by the operation pedal 14, there is no forward depression of the operation pedal 14. Although it is used when an attachment B (for example, a hydraulic hammer) that requires only the above is attached, the restricting device 19 includes a restricting member 20 provided on the operation pedal 14 side and a cab floor, as will be described later. A rocking lever (corresponding to an operation tool member of the present invention) 21 provided on the side 17 The positioning member 22, lock bolt 2
It is composed of each member such as 3.

That is, the regulating member 20 has a long upper piece 20a (corresponding to the first regulating portion of the present invention) and a short lower piece 20b (corresponding to the second regulating portion of the present invention). It has a generally chewy shape, and the opening side is rear (driver's seat 1
2 side), the upper portion of the upper piece 20a is formed on the bottom rear end side of the pedal frame 16 and the flange portion 16 is formed.
It is integrally fixed to a.

On the other hand, reference numeral 24 denotes a base frame arranged below the regulating member 20.
4 is a washer 24a and bolts 24 on the cab floor 17.
It is fastened via b. Further, reference numeral 25 denotes a shaft cylinder portion integrally provided upright from the base frame 24 so that the axial center direction is oriented in the vertical direction. The swing lever 21 is externally fitted so as to be rotatable in the direction and movable in the vertical direction, but the base end portion of the swing lever 21 is integrally fixed to the boss cylinder portion 26. It is structured such that it can swing about the shaft tubular portion 25 as a support shaft.

Further, an interference piece 21a that interferes with the regulating member 20 on the side of the operation pedal 14 is formed at the tip end of the rocking lever 21, and the rocker lever 21 has the lever tip end laterally. When it is positioned at all the restricting positions facing toward, the interference piece 21a causes the upper and lower side pieces 20 of the restricting member 20 to move.
It is fitted between a and 20b so as to interfere with the lower surface of the upper piece 20a and the upper surface of the lower piece 20b, so that both the front depression and the rear depression of the operation pedal 14 are restricted. Is set to. (See Figure 6).
On the other hand, when the swing lever 21 is positioned at a semi-regulated position in which the lever tip portion is directed obliquely rearward, the interference piece 21a interferes with the lower surface of the long upper piece 20a, but the lower piece 20b is short.
Therefore, the rear depression operation is restricted but the front depression operation is allowed (see FIG. 7). Further, when the swing lever 21 is positioned at the non-restricted position where the lever tip portion is directed rearward, the interference piece 21a does not interfere with the upper and lower side pieces 20a and 20b, whereby the front of the operation pedal 14 is prevented. Both the depression and the rear depression are set to be permitted (see FIG. 8).

The positioning member 22 is the swing lever 2
1 is for positioning at the full regulation position, the half regulation position, and the non-regulation position, and is erected from the base frame 24 along the swing locus of the swing lever 21 in an arc shape. The positioning member 22 is provided with positioning grooves 22a, 22b, 22c at which the lower portion of the rocking lever 21 can be fitted and locked at the full regulation position, the semi-regulation position, and the non-regulation position. Notch is formed.

On the other hand, a lock bolt (corresponding to the lock member of the present invention) 23 is screwed into a screw hole 25a formed in the inner peripheral surface of the shaft cylinder 25 so as to be vertically movable. However, a flange portion 23a located above the boss cylinder portion 26 is provided at the upper end portion of the lock bolt 23, whereby the rocking lever 21 can move the swing lever 21.
Clearance S between the upper end of 6 and the lower surface of the flange portion 23a
Up and down movement is allowed by the amount. Then, the clearance S is equal to the positioning concave grooves 22a, 22.
The lock bolt 23 is moved upward until it becomes larger than the groove depth of b and 22c, and in this state, the swing lever 21 is moved upward until the lower end of the swing lever 21 is located above the upper end of the positioning member 22. In this state, the rocking lever 21 can freely rock to the full regulation position, the half regulation position, and the non-regulation position without interfering with the positioning member 22. Then, the lower part of the swing lever 21 is moved so that the lower part of the swing lever 21 swings down to the full regulation position, the semi-regulation position, and the non-regulation position. Each positioning groove 22
It is adapted to be engaged and locked with a, 22b and 22c.
Further, in this state, the lock bolt 23 is attached to the flange portion 23.
When the lower surface is moved until the lower surface comes into contact with the upper end of the boss cylinder portion 26, the upper movement of the rocking lever 21 is locked, whereby the rocking lever 21 is moved to the positioning recessed grooves 22a, 22b, 22.
It is positioned and fixed to c.

The clearance X between the rocking lever 21 and the restricting member 20 at the fully restricted position and the semi-restricted position is the same as that of the rocking lever 21 and the positioning grooves 22a and 22b.
Engagement depth with (groove depth of positioning grooves 22a, 22b)
It is set to be larger than Y (X> Y), and the vertical movement of the swing lever 21 at each position is allowed.
In this case, the operation pedal 14 can be swung by the clearance X even in the restricted state, but this clearance X is about the play of the pilot valve, and there is no problem. Incidentally, the locking between the rocking lever 21 and the positioning member 22 at each position is not limited to the one in which the positioning recessed grooves 22a, 22b, 22c are formed by notches as in the above-mentioned embodiment, and for example, serration fitting. Any engagement, such as saw-tooth engagement, can be carried out as long as the engagement is positioning and held during the work.

In the embodiment of the present invention constructed as described above, as described above, the lock bolt 23 is moved upward, and in this state, the rocking lever 21 causes the interference piece 21a to move to the upper and lower sides of the regulating member 20. All regulation positions where front and rear stepping operations of the operation pedal 14 are regulated by interfering with 20a and 20b, and semi-regulation where the rear stepping operation of the operation pedal 14 is regulated by the interference piece 21a only interfering with the upper side piece 20a. The position and the interfering piece 21a are swung to the respective non-restricted positions where the front and rear depressing operation of the operation pedal 14 is allowed without interfering with the upper and lower both side pieces 20a and 20b, and are swung at the corresponding positions. If the lever 21 is moved downward to be fitted and locked in each of the positioning concave grooves 22a, 22b, 22c of the positioning member 22, and further the lock bolt 23 is moved downward to lock the upward movement of the swing lever 21. The swing lever 21 becomes possible to position and fix the respective position.

As described above, in the embodiment of the present invention, the swing lever 21 is swung to each of the fully restricted position, the semi-restricted position, and the non-restricted position to position and fix the position. Thus, the operation pedal 14 can be switched between a fully restricted state in which front and rear stepping is restricted, a semi-regulated state in which rear stepping operation is restricted, and a non-restricted state in which front and rear stepping operation is allowed. Since the positioning and fixing of the swing lever 21 and the release thereof can be performed by a simple and easy work of merely moving the lock bolt 23 up and down, the regulation state of the operation pedal can be controlled by switching the penetration of the conventional regulation pin. Compared to the one that switches, the switching work can be done easily, and there is no fear that the restriction pin or the retaining pin or the screw will come off or be lost.

Moreover, since the regulating device 19 is arranged below the rear portion of the operating pedal 14, the swinging operation of the swinging lever 21 and the vertical movement operation of the lock bolt 23 can be performed from the driver's seat 12 side. As a result, it is not necessary to carry out the switching work in the space where the front portion of the operation pedal is narrow, unlike the conventional one, and it is possible to contribute to further improvement in workability.

[0021]

In summary, since the present invention is constructed as described above, the operation pedal is moved to the restricted position and the non-restricted position by operating the operation pedal member. It is possible to switch between a restricted state in which the operation pedal is stepped on by restricting the operation part by interfering with the restriction part and a non-restricted state in which the operation pedal member is allowed to be operated without the operation member member interfering with the restriction part. As compared with the conventional method of switching the regulation state of the operation pedal by switching the penetration of the regulation pin, the switching work can be performed easily, and the regulation pin or the retaining pin or the screw may be detached or lost. Workability is improved. Further, by disposing the restricting device below the rear part of the operation pedal, it is possible to perform the rocking operation of the operation tool member from the driver's seat side, and in the narrow space at the front part of the operation pedal as in the conventional device. This eliminates the need for switching work and contributes to further improvement in workability.

[Brief description of drawings]

FIG. 1 is a schematic side view of a hydraulic excavator.

FIG. 2 is a perspective view showing the inside of a cab.

FIG. 3 is a side view of an operation pedal portion.

FIG. 4 is a side view of the regulation device.

FIG. 5 is a plan view of a regulation device.

FIG. 6 is a cross-sectional view of the regulating device at all regulating positions.

FIG. 7 is a cross-sectional view of the regulating device in the semi-regulating position.

FIG. 8 is a cross-sectional view of the regulating device in the non-regulating position.

FIG. 9 is a side view of an operation pedal portion showing a conventional example.

10 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 12 Driver's Seat 14 Operation Pedal 19 Regulation Device 20 Regulation Member 20a Upper Piece 20b Lower Piece 21 Swing Lever 21a Interference Piece 22 Positioning Member 22a Positioning Groove 22b Positioning Groove 22c Positioning Groove 23 Lock Bolt 25 Shaft Cylindrical Part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shoichi Hata 4-10-1 Yoga, Setagaya-ku, Tokyo Inside the new Caterpillar Mitsubishi Corp. (72) Inventor Norihiko Fujimura 2-5-1 Marunouchi, Chiyoda-ku, Tokyo No. Sanryo Heavy Industries Co., Ltd. (72) Inventor Shigemi Mimori 2-8-25, Niihama, Arai-cho, Takasago, Hyogo Prefecture Takahishi Engineering Co., Ltd.

Claims (7)

[Claims] 1. A working machine configured to operate a working section based on a stepping operation of an operating pedal disposed in front of a driver's seat section, and restricting the stepping operation of the operating pedal. A restricting device provided for the purpose of swinging the restricting device to each of restricted and non-restricted positions;
An operating pedal for a working machine, characterized in that the operating pedal does not interfere with the operating member member in the non-regulating position, but does not interfere with the operating member member in the regulating position to restrict the swing of the operating pedal. Stepping control device. 2. The operation pedal according to claim 1, wherein the operation pedal is swingably supported in a forward and backward direction so that a front stepping operation and a rear stepping operation from a neutral position can be performed. The restriction position is the full restriction position and the semi-regulation position, and the restriction part does not interfere with the operation tool member in the non-regulation position but interferes with the operation tool members in the full restriction position and the semi-regulation position before and after the operation pedal. It does not interfere with the first restricting portion that restricts one of the swing motions and the operation tool members at the non-restricted position and the semi-restricted position, but does not interfere with the operation tool members at all restricted positions and the other of the operation pedals swings. A pedaling regulation device for an operating pedal in a working machine, comprising a second regulation part for regulating movement. 3. The depression control device for an operation pedal in a working machine according to claim 1, wherein the operation tool member is arranged below a rear portion of the operation pedal so as to be operated from a driver's seat side. . 4. The depression regulating device for an operation pedal in a working machine according to claim 1, 2 or 3, wherein the regulation portion is integrally provided on a lower surface of the operation pedal. 5. The regulating portion according to claim 2 or 4,
It is formed of a member having a substantially chevron shape having a long upper piece serving as a first restricting portion and a short lower piece serving as a second restricting portion. An operation pedal depression regulation device in a working machine, characterized in that an interference piece is formed which interferes with a lower surface and fits between upper and lower both pieces at all restricted positions and also interferes with an upper surface of a lower piece. 6. The locking member according to claim 1, 2, 3 or 5, wherein the operation tool member is locked and positioned by the positioning member at each of the restricted and non-restricted positions, and the unlocking is performed. A stepping restriction device for an operation pedal in a working machine, which is movably supported in an axial direction with respect to a swing support shaft so as to be movable to a position. 7. The swing support shaft according to claim 6,
A stepping restriction device for an operation pedal in a working machine, comprising a lock member for locking the movement of an operation tool member locked to a positioning member to a release position.