JP2002187421A - Opening-and-closing switch for fresh air inlet cover of air conditioner for construction equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening-and-closing switch for a fresh air inlet cover of an air conditioner for construction equipment, by which a malicious act on and steeling of a filter and other equipment of an air conditioner can be prevented and which has a good appearance upon its mounting. SOLUTION: In the opening-and-closing switch for the fresh air inlet cover of the air conditioner for construction equipment, the fresh air inlet (1c), opened to the exterior wall (1b) of a cab (1) and letting the fresh air into the air conditioner in the cab, can be covered and opened freely by the fresh air inlet cover (10) having ventilating openings (10a). The fresh air inlet cover (10) is provided on the exterior wall (1b) of the cab (1), where the inlet cover (10) is supported so that the fresh air inlet (1c) is opened and closed freely, and a connecting stopping means (12) is also provided for stopping the fresh air inlet cover (10) by connecting it in the closed state to the exterior wall (1b) of the cab (1). Inside the cab (1), an operational lever (14a) for enabling the release of the connection of the connecting stopping means (12) is provided, wherein the operational lever (14a) is preferably to be provided near openings, including a door (6) and a window of the cab (1).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for opening and closing an outside air inlet cover of an air conditioner installed inside a cab of a construction machine such as a hydraulic shovel.

[0002]

2. Description of the Related Art Conventionally, when an air conditioner is installed in a cab of a construction machine, an outside air inlet for introducing outside air to the air conditioner is provided on an outer wall of the cab, and a cover having a ventilation hole for the outside air inlet is provided. Generally, the cover is bolted to the outer wall of the cab.

For example, according to the outside air introduction duct of a construction machine air conditioner disclosed in Japanese Patent Application Laid-Open No. 9-290624, as shown in FIGS. Accordingly, the outside air inlet cover 21 has a through hole 24 and a through hole 26 communicating with the outside air inlet 23 formed in the cab wall 22.
It is attached to the cab wall 22 by bolts 30 at bolt insertion holes 28 of a flange 29 provided on the outer periphery thereof.

[0004]

However, in the outside air inlet cover described in the above-mentioned Japanese Patent Application Laid-Open No. 9-290624, the outside air inlet cover 21 is attached and detached outside the cab and is commonly used. Since the outside air inlet cover 21 can be easily removed by preparing a tool even by an outsider, the outside air inlet cover 21 can be easily removed. For this reason, the filter of the air conditioner is tampered with,
May be stolen. Further, there is a problem that the flange 29 and the mounting bolt 30 of the outside air inlet cover 21 can be seen from the outside and the appearance is impaired.

The present invention focuses on the above-mentioned conventional problems, and provides a device for opening and closing an outside air inlet cover of a construction machine air conditioner, which can prevent a filter or the like of an air conditioner from being tampered with or stolen, and has a good appearance when mounted. The purpose is to:

[0006]

In order to achieve the above object, a first invention according to the present invention is directed to an air conditioner which is opened in an outer wall of a cab of a construction machine and installed in the cab. In an opening and closing device for an outside air inlet cover of a construction machine air conditioner in which an outside air inlet for introducing outside air is covered and opened by an outside air inlet cover having a ventilation hole, the cab is opened and closed so that the outside air inlet cover can be opened and closed. A locking means is provided to be supported on the outer wall and locks the outer air inlet cover to the outer wall of the cab in a closed state, and an operation lever for releasing the locking of the locking means is provided in the cab. .

According to the first aspect, the outside air inlet cover is provided on the outer wall so as to be supported, so that the outside air inlet can be freely opened and closed, and the locking of the locking means for locking the outside air inlet cover in a closed state is released. Since the operating lever is provided inside the cab, the outside air inlet cover cannot be opened from the outside of the cab in a state where doors and windows of the cab are locked so that an outsider cannot enter the cab. Thereby, the mischief, theft, and the like of the filter of the air conditioner can be prevented. Moreover, since there is no key hole or mounting bolt on the outside air inlet cover,
The appearance is beautiful. In addition, since no tools are required, the work for opening and closing the outside air inlet cover is not troublesome, and since the opening and closing can be performed in a short time, the workability is good.

In a second aspect based on the first aspect, the operation lever is provided near an opening through which a hand can be inserted from outside such as a door and a window of the cab.

According to the second aspect of the present invention, since the operation lever is provided near the opening of the cab door or window, the operation lever is operated from outside the cab by opening the door or window.
The outside air inlet cover can be easily opened even outside the cab. Therefore, work can be performed outside the cab without entering the cab during maintenance of a filter or the like of the air conditioner.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an opening / closing device for an outside air inlet cover according to the present invention will be described below with reference to FIGS. First, the outline of the configuration of the present embodiment will be described with reference to a side view of a cab equipped with an opening / closing device for an outside air inlet cover shown in FIG. An outer air inlet 1c communicating with an air inlet of an air conditioner (not shown) installed in the cab 1 is provided on an outer plate 1b on a side wall portion provided behind the door 6 of the cab 1, and a predetermined number is provided in the outer air inlet 1c. Ventilation hole 10a
Outside air inlet cover with a cover (hereinafter simply referred to as cover)
10 is provided so as to cover. The cover 10 is attached to the outer plate 1b via a hinge 11 so as to be openable and closable. The cover 10 has an engaging portion on a substantially opposite side to a mounting portion of the hinge 11, and the cover 10 is attached to the outer plate 1b by the engaging portion. It is adapted to be engaged by the attached locking means 12.
In the present embodiment, the locking means 12 will be described later.
A lock mechanism urged in a protruding direction by a spring is used, and is referred to as a lock 12 herein. The lock 12 is connected via a flexible cable 13 to an operation lever 14a mounted near the opening of the door 6 inside the cab 1, and the cover 12 is locked by the lock 12 by rotating the operation lever 14a. Is released.

Next, the details of each component will be described with reference to FIGS.
This will be described below. FIG. 2 is a sectional view taken along line AA of FIG. As shown in FIG. 2, the rear side wall of the door 6 has an inner plate 1 a and an outer plate 1 b, and a distal end of the suction duct 2 connected to an air conditioner (not shown) has an inner plate 1 1a. The distal end of the suction duct 2 has an inner dimension larger than the base end and is provided with a stepped portion 2a. The outside air filter 4 is inserted inside the suction duct 2 and is applied to the stepped portion 2a. 5 so as to be sandwiched from the outside. The holder 5 has two plates 5a, 5a on the left and right sides, and is fixed to the inner plate 1a by fitting the plates 5a, 5a between the two left and right guide plates 1d, 1d provided on the inner plate 1a. ing.

The outside air inlet 1c provided in the outer plate 1b is opened to a size large enough to pull out the holder 5 and the outside air filter 4 outward, and is covered by a cover 10 which can be opened and closed by a hinge 11. . As shown in FIG. 3, which is a cross-sectional view taken along the line BB of FIG. 1, the end of one piece 11a of the hinge 11 is mounted on a mounting seat 10b provided on the back of the cover 10, and the hinge 11 is mounted on the back of the outer plate 1b. Another piece 11b is attached. A return spring 11c is provided between one piece 11a and the other piece 11b of the hinge 11 that are rotatably connected to each other.

As shown in FIG. 2, when the lock is released, the cover 10 is opened to α ° by the return force of the spring 11c to the free state. Note that at most β
° (> 90 °). A plate 10c having a locking portion is attached to the back surface of the cover 10, and a slider 12 is attached to a plate 1e attached to the back surface of the outer plate 1b so as to freely project.
The lock 12 provided with a is attached. When the slider 12a of the lock 12 is locked to the locking portion of the plate 10c, the cover 10 is closed and the outer plate 1 is closed.
b.

FIG. 4 is a sectional view taken along the line CC of FIG. As shown in FIG. 4, a slider 12a of the lock 12 is urged in a projecting direction by a spring 12b.
2a is the wire 13 of the flexible cable 13
a to one end 13b. By pulling the other end of the wire 13a rightward in the figure by rotating the operation lever 14a, the slider 12a moves rightward against the spring 12b, and the engagement of the cover 10 with the plate 10c is released. It has become.

FIG. 5 is a sectional view taken along line DD of FIG. Figure 2
As shown in FIG. 5, the case 14b of the operation lever portion 14 is attached to the inner surface of the inner plate 1a and near the opening of the door 6, and the operation lever 14a is rotatably attached to the case 14b. . The distal end of the operating lever 14a forms an operating section, and the other end is connected to the other end 13c of the wire 13a of the flexible cable 13. A return spring 14c is provided between the case 14b and the operation lever 14a.

Next, the operation of this embodiment will be described with reference to FIGS.
This will be described with reference to FIG. In FIG. 5, by pulling up the operation portion of the operation lever 14a, the other end 13c of the wire 13a of the flexible cable 13 moves to the left in the figure. Then, in FIG. 4, the one end 13b of the wire 13a moves rightward to retreat the slider 12a rightward, and the engagement between the slider 12a and the plate 10c of the cover 10 is released. Then, as shown in FIGS. 2 and 3, the cover 10 is opened (α position) by α ° due to the urging force of the return spring 11 c of the hinge 11 to the free state. And
In this state, by further opening the cover 10 by hand (can be opened up to β ° at the maximum), the holder 5 and the outside air filter 4 can be pulled out from the suction duct 2 and taken out from the outside air inlet 1c. Maintenance such as cleaning and replacement can be easily performed.

When the cover 10 is manually pushed in from the free position after the maintenance is completed, the plate 10c of the cover 10 comes into contact with the tapered surface 12c of the slider 12a of the lock 12 to retreat the slider 12a to the right in FIG. The locking portion of the plate 10c enters the inside of the cab from the protrusion of the slider 12a. Then, the slider 12a returns to the original projecting position by the urging force of the spring 12b, and the cover 10 is locked. In this locked state, the plate 10c of the cover 10 is pressed against the projection of the slider 12a by the spring 11c of the hinge 11, so that the cover 10 does not rattle.

According to the present embodiment, the following effects can be obtained. Operation lever 14a provided inside cab 1
, The cover 10 can be unlocked and opened, so that when the door 6 and the window of the cab 1 are locked, the cover 10 is unlocked from the outside of the cab 1. And the cover 10 cannot be opened from the outside of the cab 1. Therefore, it is possible to reliably prevent the outside air filter 4 and the like inside the cover 10 from being tampered with or stolen. In addition, since the opening and closing key holes and the mounting bolts do not appear on the surface of the cover 10, the cab 1 has a beautiful appearance and good appearance. In addition, there is no need for tools for opening and closing, so there is no need to find and use tools,
No more hassle. Further, since the cover 10 can be opened in a short time by operating the operation lever 14a, workability is good.

Further, since the operating lever 14a is provided near an opening through which a hand can be inserted from the outside, such as the door 6 or window of the cab 1, the operator opens the door 6 or window to open the cab. Since the cover 10 can be opened by operating the operation lever 14a from outside the cab without entering the inside of the cab 1, workability is good and convenient at the time of maintenance of the outside air filter 4 and the like. When the installation position of the operation lever 14a is set to a position where the operator can operate the operation lever 14a while standing on the ground, the operability is very good.

In the above embodiment, the locking means 12
Is configured using a slide lock mechanism, but the present invention is not limited to this, and the same effect as described above can be obtained by using another locking mechanism (for example, locking by rotating a hook). Of course. Further, the driving method of the locking means is not limited to the above-described embodiment. For example, a slide or a hook is driven by a link mechanism, or a linearly movable actuator such as an air cylinder is driven by an operation of an operation lever. The slide may be locked and released.

As described above, according to the opening / closing device for the outside air inlet cover of the air conditioner for construction equipment according to the present invention, the operation for releasing the closed state of the outside air inlet cover by the locking means is released. Since the lever is provided inside the cab, the outside air inlet cover cannot be opened from the outside of the cab, so that the filter or the like of the air conditioner is not tampered with or stolen. Moreover, the appearance of the outside air inlet cover can be made beautiful, and the appearance is good. Also, since the operation lever is installed near the opening of the cab, the outside air inlet cover can be easily opened by operating the operation lever also from the outside of the cab, thereby improving the maintenance workability of the filter and the like of the air conditioner. Can be improved.

[Brief description of the drawings]

FIG. 1 is a side view of a cab equipped with an opening / closing device for an outside air inlet cover according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is a sectional view taken along the line CC of FIG. 1;

FIG. 5 is a sectional view taken along line DD of FIG. 1;

FIG. 6 is a front view of a conventional outside air inlet cover.

FIG. 7 is a sectional view taken along the line EE of FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cab, 1a ... Inner plate, 1b ... Outer plate (outer wall), 1c ... Outside air introduction port, 1d ... Guide plate, 2 ... Suction duct, 2a ... Step part, 3 ... Seal, 4 ...
Outside air filter, 5 ... Holder, 6 ... Door, 10 ... Outside air inlet cover, 10a ... Ventilation hole, 10c ... Plate, 11 ...
Hinge, 11a: One piece, 11b: Other piece, 11c: Spring, 12: Lock (locking means), 12a: Slider,
12b: spring, 12c: tapered surface, 13: flexible cable, 13a: wire, 13b: one end of wire, 13c: other end of wire, 14: operating lever portion, 14a
... operation lever, 14b ... case, 14c ... spring.

Claims (2)

[Claims] An outside air inlet (1c) opened on an outer wall (1b) of a cab (1) of a construction machine and for introducing outside air to an air conditioner installed in the cab is provided with an outside air having a ventilation hole (10a). In the opening / closing device for an outside air inlet cover of a construction machine air conditioner which can be freely covered and opened by an inlet cover (10), the outside air inlet cover (10) is opened and closed on the outer wall (1b) of the cab (1). Provided in support, with the outside air inlet cover (10) closed and the outer wall (1b) of the cab (1)
An operating lever (14a) that is provided with a locking means (12) for locking the locking means (12) so that the locking of the locking means (12) can be released.
Opening / closing device for an outside air inlet cover of an air conditioner for construction equipment, wherein the cover is provided in a cab (1). 2. The opening / closing device for an outside air inlet cover of an air conditioner for construction equipment according to claim 1, wherein the operation lever (14a) is inserted from outside such as a door (6) and a window of the cab (1). An opening / closing device for an outside air inlet cover of an air conditioner for construction equipment, which is provided near a possible opening.