JP2001117659A - Structure around lever of building machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent infiltration of foreign matters from a lever through-hole with an inexpensive constitution and moreover without occupying much space. SOLUTION: A structure around the lever of a building machine, having a lever 2 rotatably put through a first long hole 1a is formed at a floor plate 1 of an operation chamber and is provided with a fixed cover 3 equipped with a second long hole 3b, into which the lever 2 is rotatably inserted and fixed to the floor plate 1 and the first long cover 1a can be covered and a mobile cover 4 arranged in the fixed over 3 to be movable according to the rotating operation of the lever 2. The mobile cover 4 is constituted so that the second long hole 3b can be closed from the inside part of the fixed cover 3, regardless of the rotating position of the lever 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure around a lever of a construction machine having a lever penetrating a floor plate of a cab.

[0002]

2. Description of the Related Art FIG. 6 shows a structure around a conventional gate lock lever. The gate lock lever 51 is rotatably attached to a console 52 disposed near the entrance in the cab, and switches the gate lock valve 11 via a link mechanism 53 provided below the floor plate 1. When the gate lock lever 51 is in the vertical state,
As shown in FIG. 7, the gate lock valve 11 is located at the position where the pilot circuit is shut off. At this time, even if the pilot valve 12 is operated, the discharge pressure of the pilot pump 13 is not guided to the control valve 14, so that the hydraulic actuator 15 Not driven.

When the gate lock lever 51 is pivoted forward by a predetermined angle, the gate lock valve 11 is switched to the communicating position, so that the operation of the pilot valve 12 guides the pressure of the pilot pump 13 to the control valve 14, and the control valve 14 14 is switched. Thereby, the discharge oil of the main pump 16 is guided to the hydraulic actuator 15 via the control valve 14, and the actuator 15 is driven. At this time, the gate lock lever 5
1 is in a state of protruding into and out of the driver's cab, that is, in a state of preventing the operator from getting off, so that the operator always returns the gate lock lever 51 to the vertical state and switches the gate lock valve 11 to the shut-off position when getting off. It is made a habit. Therefore, when the operator is absent, the actuator 1
5 does not operate undesirably, and safety is ensured. This type of gate lock mechanism is disclosed in, for example,
It is also disclosed in JP-A-137567.

[0004]

In the example shown in FIG. 6, the gate lock lever 51 is provided on the console 52. However, there is a demand to eliminate the console 52 in order to make the undercarriage of the cab wide. In this case, since the gate lock lever 51 is disposed so as to penetrate the floor plate 1 of the cab, it is necessary to provide a lever through hole in the floor plate 1. The through hole needs to be a long hole having a length that allows the gate lock lever 51 to rotate, and dust and foreign matter easily enter the space below the floor plate from the long hole.

An object of the present invention is to provide a structure around a lever of a construction machine which is inexpensive and can prevent foreign matter from entering through a lever through hole without taking up space.

[0006]

FIG. 1 shows an embodiment of the present invention.
According to the present invention, the present invention is applied to a structure around a lever of a construction machine having a lever 2 rotatably operable through a first long hole 1a formed in a floor plate 1 of a cab. . The fixed cover 3 fixed to the floor plate 1 so that the lever 2 has a second long hole 3b rotatably penetrating therethrough and covers the first long hole 1a; A movable cover 4 that is disposed and moves in accordance with the rotational operation of the lever 2, and the movable cover 4 closes the second elongated hole 3 b from inside the fixed cover 3 regardless of the rotational position of the lever 2. Thus, the above problem is solved. The height of the moving cover 4 is determined so that the moving cover 4 moves substantially in contact with the surface of the fixed cover 3 on which the second elongated hole 3b is provided. According to a third aspect of the present invention, the movable cover 4 is provided with a foot 5 which is disposed so as to sandwich the lever 2 and slides on the floor plate 1. The invention according to claim 4 is configured such that the foot portion 5 is substantially in line contact with the floor plate 1. According to the fifth aspect of the present invention, the movement of the movable cover 4 is guided by the inner surface of the fixed cover 3.

In the section of the means for solving the above-mentioned problems, which explains the configuration of the present invention, the drawings of the embodiments are used to facilitate understanding of the present invention. However, the present invention is not limited to this.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a structure around a gate lock lever will be described with reference to FIGS. 1 and 2 are side views showing the structure around the gate lock lever in the present embodiment, and FIG. 3 is II in FIG.
FIG. 3 is a sectional view taken along line I-III. A lever through hole (elongated hole) 1a is provided in the floor plate 1 of the operator's cab.
The gate lock lever 2 is provided so as to penetrate through. The gate lock lever 2 can be rotated in the A and B directions by moving in the through hole 1a in the longitudinal direction.
Its base end is connected to a gate lock valve 11 (FIG. 7) via a link mechanism (not shown) provided below the floor plate 1.
Connected to.

On the floor plate 1, a through hole 1a is formed.
The cover 3 is disposed so as to cover the cover 3, and a slide cover (movable cover) 4 is disposed inside the fixed cover 3 so as to be movable in the a and b directions. Penetrates. As shown in FIG. 4, the fixed cover 3 is formed of a box-shaped metal member having an open lower portion, and has flanges 3 provided at both ends in the longitudinal direction.
It is screwed to the floor plate 1 via a. The lever through-hole 3b of the fixed cover 3 is formed as an elongated hole so that the gate lock lever 2 can be turned.

The slide cover 4 is formed of a resin plate member, and its length is shorter than the length of the internal space of the fixed cover 3 and its width is slightly shorter than the width of the space. A lever through hole 4a is formed in the center of the slide cover 4, and the slide cover 4 slides in the a and b directions with the turning operation of the gate lock lever 2 penetrating therethrough. A pair of feet 5 is detachably attached to the lower surface of the slide cover 4 with the lever through hole 4a interposed therebetween. The foot portion 5 is a triangular pyramid-shaped resin member extending over the entire length in the longitudinal direction of the slide cover 4, and slides in a state where the top portion is in line contact with the upper surface of the floor plate 1. The height of the foot 5 is set so that the upper surface of the slide cover 4 is almost in contact with the lower surface of the top plate of the fixed cover 3.

FIG. 1 shows a state in which the gate lock valve 11 is at the shut-off position, and the gate lock lever 2 is at the end position in the B direction. For this reason, the slide cover 4 is located at the rightmost position, but its upper surface completely closes the through hole 3b of the fixed cover 3 from the inside. When the gate lock lever 2 is operated in the direction A so as to switch the gate lock lever 2 to the communication position, the slide cover 4 moves leftward (direction b) while being guided by the inner surface of the fixed cover 3 and the lower surface of the top plate. Moving. At this time, a pair of feet 5 provided at the lower portion of the slide cover 4 slide on the upper surface of the floor plate 1. However, since the feet 5 are in line contact with the plate 1, the sliding resistance is minimized. Can be minimized. FIG. 2 shows a state in which the gate lock lever 2 has been operated to the end position in the direction A. At this time, the gate lock valve 11 has been switched to the communicating position. The slide cover 4 reaches the leftmost position, and also at this time, the upper surface of the slide cover 4 completely closes the through hole 3b of the fixed cover 3. If the tip of the foot 5 is worn, the sliding resistance increases. In that case, it may be replaced with a new one.

As described above, in the present embodiment, since the fixed cover 3 covers the lever through hole 1a of the floor plate 1, it is possible to suppress the entry of dust and foreign matter from the through hole 1a into the lower space. Dust and the like can only enter into the fixed cover 3 from the lever through hole (elongated hole) 3b and reach the through hole 1a, but the upper surface of the slide cover 4 is fixed to the fixed cover 3 as described above. Since the slide cover 4 closes the lever through hole 3b from the inside regardless of the operation position of the gate lock lever 2, the intrusion of dust and the like into the fixed cover 3 is minimized regardless of the operation position of the gate lock lever 2. Is suppressed. Even if dust or the like enters through the lever through hole 3b, the side of the slide cover 4 and the fixed cover 3
Since the gap with the inner surface of the slab is very small, few reach the floor plate 1 through this gap, and those that reach the floor plate 1 are also blocked by the feet 5 and reach the through hole 1a. Absent.

Further, a lever through hole 4a of the slide cover 4 is provided.
Is small enough to allow the sliding movement of the slide cover 4 at a minimum. Therefore, the gap between the through hole 4a and the gate lock lever 2 is very small, and the amount of foreign matter entering the fixed cover 3 from here is small. Is less. If an elastic body such as rubber is disposed in the gap, foreign matter can be completely prevented from entering the gap.

Here, as a measure for preventing foreign matter from entering through the lever through-hole, it has been conventionally practiced to put a conical boot such as vinyl chloride on the lever (see, for example, Japanese Patent Application Laid-Open No.
203629). However, such boots require space over 360 degrees around the lever and also take up space in the lever height direction. For this reason, when applied to a lever that penetrates the floor plate, there is a problem in securing a foothold for the operator, and articles and the like cannot be placed near the lever. When the fixed cover 3 and the slide cover 4 are used as described above, it is sufficient to secure a space only in the slide direction of the slide cover 4, and it takes up little space in the height direction. This is advantageous, and an article or the like can be placed near the lever as needed.

Although the above description has been made with reference to the gate lock lever, the present invention can be applied to other levers that are disposed so as to penetrate the floor plate of the cab.

[0016]

According to the present invention, the fixed cover is arranged so as to cover the long hole (lever through hole) of the floor plate, and the movable cover moves in the fixed cover as the lever is rotated. None, regardless of the pivot position of the lever, the movable cover closes the long hole of the fixed cover, so it has a low-cost configuration and prevents foreign matter from entering through the long hole of the floor plate in a minimum space. I can do it.

[Brief description of the drawings]

FIG. 1 is a side cross-sectional view showing a structure around a lever of a construction machine according to an embodiment of the present invention, showing a state where a gate lock lever is at an end position in a B direction.

FIG. 2 is a view similar to FIG. 1, showing a state in which a gate lock lever is at an end position in an A direction.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a perspective view showing a fixed cover 3 and a slide cover 4.

FIG. 5 is a plan view showing a fixed cover 3 and a slide cover 4.

FIG. 6 is a perspective view showing a structure around a conventional gate lock lever.

FIG. 7 is a circuit diagram of a hydraulic circuit having a gate lock valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Floor plate 1a Lever through hole 2 Gate lock lever 3 Fixed cover 3b Lever through hole 4 Fixed cover 4a Lever through hole 5 Foot 11 Gate lock valve

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Seiji Kojima 650, Kandamachi, Tsuchiura-shi, Ibaraki F-term in the Tsuchiura Plant of Hitachi Construction Machinery Co., Ltd. (Reference) 3J070 AA03 BA67 CA42 CB34 CE01 DA21

Claims (5)

[Claims] 1. A construction around a lever of a construction machine having a lever rotatably penetrating a first elongated hole formed in a floor plate of a cab, wherein the lever rotatably penetrates a first slot. With two long holes,
A fixed cover that is fixed to the floor plate so as to cover the first elongated hole; and a movable cover that is disposed inside the fixed cover and that moves with a rotation operation of the lever. A structure around a lever of a construction machine, wherein the movable cover closes the second elongated hole from the inside of the fixed cover regardless of a rotation position. 2. The height of the movable cover is set such that the movable cover moves substantially in contact with a surface of the fixed cover provided with the second elongated hole.
The structure around the lever of the construction machine according to 1. 3. The construction machine according to claim 1, wherein the movable cover is provided with a foot that is disposed so as to sandwich the lever and that slides on the floor plate. The structure around the lever. 4. The structure around a lever of a construction machine according to claim 3, wherein the foot portion is configured to make substantially line contact with the floor plate. 5. The structure around a lever of a construction machine according to claim 1, wherein the movement of the movable cover is guided by an inner surface of the fixed cover.