JPH08199627A - Control box switchgear - Google Patents

Abstract

(57) [Summary] [Purpose] A control box provided on the side of the driver's seat of construction machinery, etc., which has a working machine operating lever, is moved to the rear when getting on and off to secure the passage width. [Structure] Sliding mount 1 provided on a chassis, control box 4, first link 5 and second link 2 having different lengths
Link 6 forms an unequal-sided four-section link. Sliding mount 1
A plate 11 having a guide groove 11a is erected on the plate. When getting on / off the lever 9 attached to the control box 4, the roller 10 attached to the lever 9 is pulled up.
Is disengaged from the lower lock portion of the guide groove 11a, and the control box 4 is urged by the compression coil spring 7 and flipped up. The roller 10 ascends along the guide groove 11a and enters the upper lock portion 11b to fix the control box 4 at the entry / exit position. By using the unequal-sided four-bar link, the control box 4 can be largely retracted with a small amount of flip-up.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control box opening / closing device which is disposed on the side of a driver's seat of a construction machine and has various operating levers.

[0002]

2. Description of the Related Art In a construction machine such as a hydraulic excavator, a control box that doubles as an armrest is provided on the left and right sides of a driver's seat, and a joystick (hereinafter referred to as a work machine operating lever) provided at the front ends of these left and right control boxes. It is possible to drive the boom, arm, bucket and the like of the working machine by moving the front and rear and left and right, or to rotate the upper revolving structure in the left and right directions. Further, in front of the driver's seat, there are provided levers, pedals, etc. necessary for traveling and steering operation of the hydraulic excavator. Therefore, the space around the driver's seat is small, and in particular, the work machine operating lever provided on the control box projects to the upper left and right of the driver's seat, which obstructs the passage of the operator when getting on and off the construction machine. It is difficult to get on and off.

Various improvements have been made in the past in order to improve the entry / exitability of a construction machine having the above structure. For example, according to Japanese Utility Model Publication No. 2-47251, FIG.
As shown in FIG. 1, the rear portion of the control box 4 is pivotally attached by one connecting pin 14 so as to be tiltable, and the sliding mount 1
A tilting force imparting device 15 and a lock device are provided between the control box 4 and the control box 4, and the control box is flipped up backward when getting on and off the vehicle so that the operator can easily pass through. Further, according to Japanese Utility Model Laid-Open No. 4-117055, when the lock lever is operated, a safety lock device that locks the operation of the working machine operates. In conjunction with this, as shown in FIG. 4B, equilateral four-bar links 16, 17
Oscillates, and the control box 4 is translated rearward to widen the space for getting on and off.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the control box opening / closing device according to Japanese Patent Laid-Open No. 51, since the center of rotation is at one location, unless the front end of the control box is flipped up sufficiently high, it is not possible to obtain a space through which passengers can easily pass through. However, when the tilting angle of the control box 4 is increased, the tilting force imparting device 15 remarkably extends, and when a compression spring mechanism is used for the tilting force imparting device 15, when the control box 4 is returned from the entry / exit position to the normal working position. It is not practical because it requires a great deal of force. In addition, the base end of the compression spring mechanism is connected to the connecting pin 1
When it approaches 4, the length change of the mechanism becomes small,
The repelling force is significantly reduced.

Further, in the structure in which the control box is translated in the front-rear direction by using the equilateral four-bar links as in the above Japanese Utility Model Laid-Open No. 4-117055, the amount of protrusion of the rear end of the control box at the entry / exit position is large. There must be sufficient space behind the box. This undesirably increases the useless space behind the driver's seat.

The present invention has been made in view of the above-mentioned conventional problems. In order to improve the entry / exitability of a construction machine or the like, it is possible to sufficiently widen the aisle width when an operator gets on / off the vehicle, and the position at the time of getting on / off the vehicle. It is an object of the present invention to provide a control box opening / closing device that can be easily switched to a normal working position.

[0007]

In order to achieve the above object, a control box opening / closing device according to the present invention comprises:
In a control box on the side of the driver's seat that has an operating lever for construction machinery, the chassis and the control box are swingably connected by front and rear links, and one of the front and rear links is the other link. A longer unequal quadrilateral link is formed, and in the above configuration, a spring mechanism for urging the control box upward is provided between the control box and one of the links. ,
A feature of the present invention is that a lock mechanism for fixing the control box is provided at each of the normal work position and the getting-on / off position of the control box.

[0008]

According to the above construction, the chassis and the control box are connected by the unequal-sided four-bar link, and the spring mechanism is provided between the control box and one of the links. Is tilted up and flipped up, and is displaced along the front-back direction of the driver's seat. Even if the amount of flip-up is small, the amount of movement of the front end of the control box in the front-rear direction is large, so that a boarding / alighting passage with a wide frontage can be obtained on the side of the driver's seat. On the other hand, the amount of movement of the rear end of the control box in the front-rear direction is small. Further, since the lock mechanism for fixing the control box to the normal working position or the entry / exit position is provided, it is possible to always fix the control box at any position.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a control box opening / closing device according to the present invention will be described below with reference to the drawings.
FIG. 1 is a side view showing a first embodiment of a control box opening / closing device, showing a state when a construction machine or the like is in operation, that is, a normal working position. A sliding base 1 is provided on a chassis of a construction machine or the like so as to be slidable in the front-rear direction, and a driver's seat 2 is attached to the sliding base 1 via a connecting member (not shown), and a working machine is operated on the left and right sides thereof. A control box 4 having a lever 3 is provided. In the control box 4, the first link 5 on the front side is connected to the slide base 1 via a quadrilateral link having an isosceles side longer than the second link 6 on the rear side. The intermediate portion of the first link 5 and the control box 4 are connected by a compression coil spring 7.
The compression coil spring 7 biases the control box 4 upward in an attempt to widen the angle formed by the first link 5 and the bottom surface of the control box 4.

A connecting pin 8 connecting the control box 4 and the first link 5 is provided with a base end portion of a lever 9 projecting forward of the control box 4. The lever 9 has a hook-like curved shape, and a roller 10 is rotatably attached to a bracket protruding from a substantially V-shaped curved point near the base end. Sliding mount 1
A plate 11 is erected on the plate 11, and the roller 10 can slide along a guide groove 11a provided on the plate 11. The guide groove 11a is provided with the control box 4 when the lever 9 is displaced rearward and upward.
Has a curved shape along the locus of sliding, and has lock portions 11b, 11b at both upper and lower ends that prevent the roller 10 from sliding. Further, a tension coil spring 12 is provided between the base end of the lever 9 and the inside of the front surface of the control box 4.
Is attached to urge the lever 9 downward. Further, a loose spring 13 is attached between the vicinity of the base end portion of the lever 9 and the second link 6.

In the case of a construction machine having a door for getting on and off on the left side of the operator's cab, the roller 10 is engaged with the lower lock portion 11b of the guide groove 11a formed in the plate 11 during operation as shown in FIG. As a result, the control box 4 on the left side of the driver's seat is fixed at the normal working position. The upper surface of the left control box 4 in the normal working position is held horizontally similarly to the right control box.

FIG. 2 is an explanatory diagram showing the movement of the control box 4 when the control box is switched from the normal working position to the entry / exit position. In addition, in FIG.
Each spring 12, 13 other than the compression coil spring 7
Is omitted. When the operator pulls up the lever 9 when getting off the construction machine, the roller 10 is disengaged from the lower lock portion 11b as shown in FIG. 2 (a). Further, when the lever 9 is pulled up, a safety lock device (not shown) is activated, and, for example, the operation of the working machine is locked.

When the lever 9 is further pulled up after the roller 10 is disengaged from the lower lock portion 11b, the control box 4 is easily biased by the tension of the compression coil spring 7 as shown in FIG. 2 (b). Although it moves rearward and upward, since the first link 5 is longer than the second link 6, the rear end of the control box 4 gradually lowers with respect to the front end.
During this time, the roller 10 slides upward along the guide groove 11a of the plate 11. Along with this, the loose spring 13 (not shown) is gradually compressed. When the roller 10 reaches the upper end of the guide groove 11a, the tension of the compressed loose spring 13 (not shown) acts on the roller 10 via the lever 9 to move the roller 10 as shown in FIG. 2 (c). The control box 4 is fixed to the entry / exit position by pressing it against the upper lock portion 11b.

When the control box 4 is flipped up rearward as described above, the width of the passage formed on the left side of the driver's seat is such that the control box 4 is rotated despite the small amount of flip up of the control box 4. It is wider than the conventional construction machine where the center is one place, and the operator can easily pass through it. In addition, since the change in the length of the compression coil spring 7 when switching from the normal working position to the entry / exit position is slight, the compression force for returning from the entry / exit position to the normal working position may be small, and the switching operation can be performed. easy. In addition, the amount of protrusion of the control box to the rear of the driver's seat is smaller than that of conventional construction machines equipped with equilateral four-bar links and a slide-type control box. The space to store can be reduced.

The unequal-sided four-bar link interposed between the sliding base 1 and the control box 4 is not limited to the one in which the first link 5 on the front side is longer than the second link 6 on the rear side. FIG. 3 is a schematic diagram showing a comparison between the first embodiment and the second embodiment when the amount of horizontal movement of the front end of the control box 4 when getting on and off is the same.
FIG. 3A is a first embodiment described above, and FIG. 3B is a second embodiment in which the first link 5 is shorter than the second link 6. Also in the second embodiment, as shown in FIG. 3B, a passage width equivalent to that of the first embodiment can be obtained.

[0016]

As described above, according to the present invention, since the chassis, the control box, and the front and rear links are of the unequal-sided four-bar linkage type, the operator can operate even if the control box is flipped up a small amount. The amount of movement of the front end of the control box to the rear at the time of getting on and off is increased, and the getting on and off property in the construction machine can be remarkably improved. Further, since a large operating force is not required when returning from the entry / exit position to the normal work position, the position of the control box can be switched very easily.

[Brief description of drawings]

FIG. 1 is a side view of an opening / closing device for a control box according to a first embodiment of the present invention.

2A and 2B are explanatory views showing the movement of the control box when switching from the normal work position to the boarding / alighting position, where FIG. 2A is a state in which a lock mechanism is removed, and FIG.
(C) is explanatory drawing which shows the state fixed to the position at the time of boarding / alighting.

FIG. 3 is a comparative explanatory diagram of a first embodiment and a second embodiment of the present invention, in which (a) shows the first embodiment and (b) shows the second embodiment.

4A and 4B are explanatory views of a control box opening / closing device according to a conventional technique, in which FIG. 4A shows a one-point support system and FIG. 4B shows a parallel link system.

[Explanation of symbols]

 1 Sliding base 2 Driver's seat 3 Working machine operating lever 4 Control box 5 1st link on front side 6 2nd link on rear side 7 Compression coil spring 9 Lever 10 Roller 11 Plate 11a Guide groove 11b Vertical lock part.

Claims (3)

[Claims] 1. In a control box which is located on the side of a driver's seat and which is provided with an operating lever for a construction machine or the like, a chassis and a control box are swingably connected by front and rear links, and one of the front and rear links is connected. An opening / closing device for a control box, wherein the link forms a unequal quadrilateral link longer than the other link. 2. The control box opening / closing device according to claim 1, further comprising a spring mechanism provided between the control box and one of the links for urging the control box upward. 3. The control box opening / closing device according to claim 2, further comprising a lock mechanism for fixing the control box to each of the normal work position and the entry / exit position of the control box.