JP2008021218A - Pedal operating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide pedal operating device provided with a regulation means for the operation range of a pedal, that performs a rocking operation back and forth, which eliminates the need of a space for installation and operation beside the pedal and is esy in a switching operation. <P>SOLUTION: An operation regulation means 28 is provided with a pedal bracket 34 mounted integrally at the back of a tread T of the pedal 22 and having operation range regulation parts 32 at an edge part, a lock pin 36 for regulating the operation range of the pedal 22 in cooperation with a selected operation range regulation part, a support bracket 40 having a locking part 38 for locking the lock pin 36 at positions corresponding to the respective operation range regulation parts in a freely engageable and disengageable way, and a lock lever 42 connected to the lock pin 36 and located ahead of the pedal 22 to operate the engagement and disengagement of the locking part corresponding to the selected operation range regulation part with/from the lock pin 36. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to a pedal operating device suitable for a work machine such as a hydraulic excavator.

A hydraulic excavator, which is a typical example of a work machine, includes a plurality of pedal operation devices for operating an operation of a work device or the like on a floor surface of a driver's seat (for example, see Patent Document 1).

This pedal is swung back and forth by the operator's feet. For example, when the pedal for operating the expansion and contraction of the cylinder is not operated, the pedal is held at the “neutral” position between the front and the back by the urging force, and the operation of the cylinder is stopped. When the pedal is stepped forward, the cylinder is extended, for example.When the pedal is released, the cylinder returns to the neutral position. Conversely, when the pedal is stepped backward, the cylinder is contracted and when the pedal is released. Return to neutral position.

A work machine such as a hydraulic excavator is equipped with various work devices such as a breaker and a grapple according to work. Therefore, the following three typical forms are required for the operation of the pedal in accordance with the work device.

First mode: When the working device is a grapple that is a gripping device or a crushing claw that is a crushing device, for example, an operation of gripping and releasing is necessary. Therefore, the operation of the pedal requires a “double action” operation in which the pedal is gripped “front”, held “neutral”, and released “backward”.

Second mode: When the working device is, for example, a breaker that is a striking device, the operation is only whether or not the striking operation is performed. Therefore, the operation of the pedal is “forward” on, “neutral” off, A "single action" operation is required.

Third form: When the work device is not operated depending on the work situation, etc., to prevent the work device from operating accidentally when the adjacent pedal is operated, or even if a pedal is provided, the work device is equipped. If not, a “fixed” configuration is required to prevent the pedal from moving back and forth.

Various means have been put to practical use for mechanically switching the operation modes required for a pedal, such as double-acting, single-acting, and fixing. An example (refer patent document 2, FIG. 7) attaches | detaches the volt | bolt which contact | abuts the back surface of a pedal and regulates the movement to the floor surface under a pedal. In another example (see Patent Document 2, FIGS. 1 to 5), the movement of the pedal is regulated by inserting and removing the mounting pins so that a plurality of pins can be freely inserted and removed from the side of the pedal.
JP-A-7-292726 JP-A-8-175215

However, the pedal operating device having the operation restricting means as described above has the following problems that are desired to be improved.

In other words, the means for detachably attaching the bolt for restricting the movement of the pedal to the floor surface under the pedal is effective when the pedal operation mode is rarely or rarely switched, but when the switching frequency is high. Requires a tool to attach and detach bolts, and the switching operation is troublesome.

The means for detachably inserting a plurality of pins beside the pedal requires an installation space and an operation space for the plurality of pins beside the pedal, and when a plurality of pedals are installed adjacent to each other, the floor surface is narrow. In some cases, it is difficult to install and operate the pins, and it is troublesome to operate the plurality of pins.

Furthermore, a work machine such as the hydraulic excavator described above includes a quick coupler device that allows the work device to be quickly attached and detached. Depending on the work, for example, when the work device is replaced with a single-action breaker or a double-action grapple and operated with the same operation pedal, the single-action operation and the double-action operation can be easily switched. It is hoped that it can be done.

The present invention has been made in view of the above facts, and its technical problem is that a means for switching the operation range of the pedal that is operated to swing in the front-rear direction can be installed on the side of the pedal and no operation space is required, and It is an object of the present invention to provide a pedal operating device that facilitates switching operation and is provided.

According to the present invention, as a pedal operating device that solves the above technical problem, an operation restricting means that selectively restricts an operation range of a pedal that is swingable in the front-rear direction around an axis is provided, and the operation restricting means includes: A pedal bracket integrally attached to the back of the pedal tread surface and having a plurality of types of operation range restriction portions on an arcuate edge centered on the axis, and an operation range restriction portion selected in parallel with the axis A lock pin for restricting the operation range of the pedal in cooperation with the support bracket having a plurality of engagement portions for releasably engaging the lock pin at positions corresponding to the plurality of operation range restriction portions, and the lock pin. A pedal operating device is provided, characterized in that the pedal operating device includes a locking portion that is connected and located on the front side of the pedal and that corresponds to the selected operation range restricting portion and a lock lever that operates engagement / disengagement of the lock pin. It is.

Preferably, the plurality of types of operation range restricting portions include a double-acting portion that can operate the pedal in both the front and rear directions, a single-acting portion that can operate in the front direction, and a fixed portion that cannot operate in both directions. Yes. The lock pin is urged in the direction of the axis by the urging means.

The operation restricting means of the pedal operating device configured according to the present invention includes a pedal bracket attached to the back of the pedal and having an operation range restricting portion at an edge centered on the swing axis of the pedal, and cooperates with the restricting portion. A lock pin for restricting the operation range of the pedal, a support bracket having a lock part for releasably locking the lock pin to a corresponding position of the operation range restriction unit, and a lock pin located on the front side of the pedal It has a lock lever to operate.

Therefore, to switch the operating range of the pedal, use the lock lever on the front side of the pedal to select the operating range restricting portion of the pedal bracket, the locking portion of the support bracket, and the lock pin arranged on the back of the pedal. Therefore, the means for switching the operation range of the pedal can be installed on the side of the pedal, and a space for operation can be eliminated, and the switching operation can be facilitated and provided.

Hereinafter, a pedal operation device configured according to the present invention will be described in more detail with reference to the accompanying drawings illustrating preferred embodiments.

This will be described with reference to FIGS. The pedal operating device P is placed on the floor 20 by placing a foot on the tread surface T of the pedal 22 and operating it forward from the neutral position (state of FIG. 1) about the axis X to the front indicated by the arrow F or the rear indicated by R. The installed hydraulic pilot valve 24 is switched to supply and discharge pilot pressure oil for controlling the operation of hydraulic operating equipment such as a hydraulic cylinder. The hydraulic pilot valve 24 is attached to the floor 20 by a plurality of bolts 26.

The pedal operating device P performs a “double acting” operation that allows an operation in the front and rear direction of the pedal 22, a “single action” that allows an operation between the neutral position and the front, and a front and rear operation. An operation restricting means 28 is provided for restricting “fixed” to be impossible.

The operation restricting means 28 includes a pedal bracket 34 that is integrally attached to the back of the tread surface T of the pedal 22 and has an arcuate edge 30 centered on the axis X, and a plurality of types of operation range restricting portions 32. A lock pin 36 that restricts the operation range of the pedal 22 in cooperation with the selected operation range restriction unit 32 that is positioned in parallel, and a plurality of lock pins 36 that are detachably locked at positions corresponding to the operation range restriction units 32, respectively. The support bracket 40 having the lock portion 38 and the lock pin 36 connected to the lock pin 36 and positioned on the front side of the pedal 22 are operated to engage and disengage the lock portion 38 and the lock pin 36 corresponding to the selected operation range restricting portion 32. A lock lever 42 is provided.

The pedal bracket 34 is formed by bending a steel plate, and is integrally joined to a rectangular bottom plate portion 34a extending in the front-rear direction of the pedal 22 and a center in the front-rear direction of the back surface of the pedal 22 extending upward from the left and right sides of the bottom plate portion 34a. In addition, side plate portions 34b and 34c having an arcuate edge 30 formed on the front side, and a rear plate portion 34d extending upward from the rear end of the bottom plate portion 34a and integrally joined to the rear rear portion of the pedal 22 are provided. The bottom plate portion 34 a is attached to the hydraulic pilot valve 24 by a plurality of bolts 44.

The support bracket 40 is formed by bending a steel plate, and a bottom portion 40a attached to the floor 20 surface, and a vertical plate extending upward from the bottom portion 40a along both sides of the pedal bracket 34 and having a locking portion 38 formed at the upper end portion. 40b and 40c are provided.

The operation range restricting portion 32 will be described with reference to FIGS. 3A and 3A together with FIGS. The operation range restricting portion 32 includes a double acting portion 32a, a single acting portion 32b, and a fixing portion 32c as a plurality of kinds of operation range restricting portions on the edge portions 30 of the pair of side plate portions 34b and 34c, on the bottom plate portion 34a side. Between the Y1 position and the back surface Y5 position of the pedal 22, it is provided sequentially.

The double-acting portion 32a is formed by an arc portion 32d having a radius R1 about the axis X between the positions Y1 and Y2. The single-acting portion 32b is formed between the positions Y2 and Y3 by an arc portion 32e having a radius R2 that is substantially smaller than the radius R1 by the outer diameter of the lock pin 36. At the position Y2, the arc portion 32d having a radius R1 is connected to the arc portion 32e having a radius R2 by an R portion having wall portions 32f extending radially. The fixing portion 32c is formed between the positions Y3 and Y4 by a U-shaped recess 32g that locks the lock pin 36 and has a bottom portion positioned at a radius R3 that is substantially smaller than the radius R2 by the outer diameter of the lock pin 36. . Between the positions Y4 and Y5, an arc portion 32h having a radius R2 or smaller radius R4 is provided.

The locking portion 38 will be described with reference to FIGS. 1 and 2 and FIG. 3 (b) mainly with reference to FIG. 3 (b). The locking part 38 includes a double-action locking part 38a, a single-action locking part 38b, and a fixing locking part 38c as a plurality of locking parts at the upper ends of the vertical plates 40b and 40c. Each is provided with a lock pin 36 formed in a concave groove shape so that it can be freely inserted and disengaged.

One vertical plate 40b is provided with a mounting hole 40d for urging means 46 described later. The support bracket 40 has a bottom 40a mounted on the floor 20 and is attached by bolts (not shown).

The description will be continued with reference to FIGS. The lock pin 36 is formed in a round bar shape, and both ends of the pair of vertical plates 40b, 40c of the support bracket 40 are respectively connected to the double-action locking portion 38a, the single-action locking portion 38b, and the fixing locking portion 38c. It has a length to be locked. A rectangular plate piece 46a is positioned between one end of the lock pin 36, between the side plate portion 34b of the pedal bracket 34 and the vertical plate 40b of the support bracket 40, and the lock pin 36 penetrates and is fixed to the plate piece 46a. Yes.

A tension spring 46b, which is a biasing means 46 for biasing the lock pin 36 in the direction of the axis X, is attached between one end of the plate piece 46a and the mounting hole 40d of the support bracket 40. On the other side of the plate piece 46a, the aforementioned lock lever 42 is integrally attached with a T-shaped grip portion.

The operation of the operation restricting means 28 for restricting the operation range to “double acting”, “single acting” or “fixed” will be described with reference to FIGS.

“Double acting” Figure 4 (a):
When the lock pin 36 is separated from the engaging portion 38 of the support bracket 40 against the urging force of the urging means 46 by the lock lever 42 and is positioned and engaged with the double-action engaging portion 38a, the lock pin 36 is attached to the pedal bracket 34. The pedal bracket 34 integrated with the pedal 22 and positioned integrally with the double-acting portion 32a of the operation range restricting portion 32 is neutral without being restricted by the lock pin 36 from swinging around the axis X. From the position (N), the front (F) and the rear (R) can be freely operated, and the “double acting” operation is possible.

“Single acting” FIG. 4 (b):
When the lock pin 36 is positioned and locked to the single-action locking portion 38b by the lock lever 42, the lock pin 36 is positioned outside the single-acting portion 32b of the operation range restricting portion 32 of the pedal bracket 34 so as to be integrated with the pedal 22. In the pedal bracket 34, the wall portion 32f abuts against the lock pin 36 and is prevented from moving rearward (R) around the axis X, so the operation from the neutral position (N) to the front (F), that is, “ “Single acting” operation is possible.

“Fixed” FIG. 4 (c):
When the lock pin 36 is positioned and locked on the fixing locking portion 38c by the lock lever 42, the lock pin 36 is positioned on the fixing portion 32c of the operation range restricting portion 32 of the pedal bracket 34, and the pedal bracket integrated with the pedal 22 is integrated. No. 34 is in a “fixed” state in which operation from the neutral position (N) centered on the axis X to the front (F) rear (R) is impossible by the lock pin 36.

The effects of the pedal operating device P including the operation restricting means 28 as described above will be described.

In the pedal operating device P, the operation restricting means 28 for restricting the operation range of the pedal 22 is attached to the back of the tread surface T of the pedal 22 so as to be operated in a plurality of types on the edge 30 centering on the axis X. A pedal bracket 34 having a range restricting portion 32 (32a, 32b, 32c), a lock pin 36 for restricting the operating range of the pedal 22 in cooperation with the selected operation range restricting portion 32 positioned parallel to the axis X, and a lock A support bracket 40 having a plurality of engaging portions 38 (38a, 38b, 38c) for releasably engaging the pins 36 at positions corresponding to the respective operation range restricting portions 32, and a lock pin 36. A lock lever 42 is provided for operating engagement / disengagement between the locking portion 36 and the lock pin 36 corresponding to the selected operation range restricting portion 32 located on the front side of the pedal 22.

Therefore, in order to switch the plurality of types of operation ranges 32 of the pedal 22, a plurality of types of operations provided on the pedal bracket 34 on the back side of the pedal 22 with the locking position of the lock pin 36 by the lock lever 42 positioned on the front side of the pedal 22. Since it is only necessary to selectively correspond to and lock the range restricting portion 32, the operation restricting means 28, which is a switching means for the operation range of the pedal 22, is installed on the side of the pedal 22 and no operation space is required, and the switching operation is performed. Can be easily provided.

The pedal operating device P includes a plurality of types of operation range restricting portions 32, a double-acting portion 32a capable of operating the pedal 22 in both the front and rear directions, a single-acting portion 32b capable of operating in the forward direction, and an operation in both directions not possible. Since the fixed portion 32c is provided, the three types of operation modes can be appropriately switched according to the purpose of the pedal operation, and the pedal operation can be performed efficiently.

In particular, when a quick coupler device such as a hydraulic excavator that can quickly attach and detach various work devices is provided and a work device is equipped with a single-action breaker or a double-action grapple, one pedal operation device P Can be easily switched to the single action operation or the double action operation by the operation restricting means 28.

Further, since the lock pin 36 is urged in the direction of the axis X by the urging means 46, the pedal operation device P is regulated and held in a plurality of types of operation range regulating sections more reliably and easily. be able to.

The side view of the pedal operation apparatus comprised according to this invention. The perspective view of the pedal operation apparatus of FIG. 1 (attachment means, such as a volt | bolt, is abbreviate | omitted). The principal part expansion detail drawing of the pedal bracket and support bracket of FIG. (A) is a pedal bracket, (b) is a support bracket. FIG. 2 is an explanatory diagram of the operation of the operation restricting means of FIG.

Explanation of symbols

22: Pedal 28: Operation restricting means 30: Edge 32a: Double acting part (operation range restricting part)
32b: Single acting part (operation range restricting part)
32c: Fixed part (operation range restricting part)
34: Pedal bracket 38a: Double-action locking portion (locking portion)
38b: Single-action locking portion (locking portion)
38c: Locking portion for locking (locking portion)
40: support bracket 42: lock lever 46: biasing means P: pedal operating device T: tread surface X: axis

Claims (3)

An operation restricting means for selectively restricting the operation range of the pedal that can be swung in the front-rear direction around the axis line,
The operation regulation means
A pedal bracket that is integrally attached to the back of the tread surface of the pedal and has a plurality of types of operation range restricting portions on an arcuate edge centered on the axis;
A lock pin that is positioned parallel to the axis and cooperates with the selected operation range restricting unit to restrict the operation range of the pedal;
A support bracket having a plurality of locking portions for releasably locking the lock pin at positions corresponding to the plurality of operation range restricting portions;
A lock lever connected to the lock pin and positioned on the front side of the pedal and corresponding to the selected operation range restricting portion, and a lock lever for operating the lock pin.
A pedal operating device characterized by that. Multiple types of operation range restriction sections
It has a double-acting part that can be operated in both the front and rear directions of the pedal, a single-acting part that can be operated in the forward direction, and a fixed part that cannot be operated in both directions.
The pedal operating device according to claim 1. Lock pin
Biased in the direction of the axis by biasing means;
The pedal operating device according to claim 1 or 2, characterized by the above.

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