JPH092061A - Opening and closing device of cabin front window in construction machine - Google Patents

Abstract

PURPOSE: To restrain backlash during traveling with a front window stored in a cabin roof part, and to smoothly open the front window by preventing an upper roller from being caught on a guide groove. CONSTITUTION: A guide groove 8 is provided for guiding a lower roller 7 of a front window 2 and an upper roller 6 thereof having a smaller diameter than the roller 7, an upper roller holding member 12 is provided on the rear end part of the guide groove 8, and a lower roller regulating member 9 is provided on the corner part 8c of the guide groove 8, whereby with the front window stored in the cabin roof part, the upper roller 6 is restricted in the vertical and longitudinal directions by the upper roller holding member 12, and the vertical movement of the lower roller 7 is regulated by the lower roller regulating member 9.

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 a front window provided on a front surface of a cabin of a construction machine such as a hydraulic excavator, a wheel crane, a truck crane, a crawler crane or the like.

[0002]

2. Description of the Related Art Conventionally, in a cabin of a construction machine,
Glass windows are provided on each of the front surface, the back surface, the side surface, and the roof portion in order to improve the visibility during work.

Also, as shown in Japanese Utility Model Publication No. 62-72819 and Japanese Utility Model Publication No. 4-52183, for ventilation,
In order to further improve the visibility, it is known that the front window is slid upward to be fully opened and is housed substantially horizontally inside the roof.

In this known technique, upper rollers are provided on both left and right sides of the upper part of the front window, and lower rollers are provided on both left and right sides of the front window, while guide grooves are provided in the cabin across the front part and the inside of the roof part. Side vertical groove portion and roof side lateral groove portion are provided in a state where they are curved in an arc at the corner where they are continuous, and the front window is closed by the rolling operation of the upper and lower rollers in this guide groove. It is configured to slide between the inside and the storage position inside the roof.

[0005]

However, according to this configuration, when traveling with the front window fully opened (stored),
There is a problem that the front window rattles within the range of the play of the roller in the guide groove (gap between the roller and the guide groove), and noise is generated.

In order to suppress the rattling, it is sufficient to minimize the gap by means such as providing a gap adjusting member at the portion where the roller is located during storage.

However, since the gap cannot be reduced to 0 even in this case, the rattling suppression effect is not sufficient.

Further, as an adverse effect of reducing the gap, when the front window is opened, there occurs a problem that the pioneer upper roller is caught in the guide groove, especially the corner portion, and the front window cannot be opened smoothly. .

Therefore, according to the present invention, the rattling of the front window can be effectively suppressed, and the front roller can be smoothly opened by preventing the upper roller from being caught in the guide groove. A device is provided.

[0010]

According to a first aspect of the present invention, an upper roller is provided on both left and right sides of an upper portion of a front window provided on a front surface of a cabin, and lower rollers are provided on both left and right sides of the lower portion. A guide groove for guiding is provided so as to straddle the front of the cabin and the inside of the roof, and the front window is used for rolling operation of the upper and lower rollers in the guide groove to close the front of the cabin and store it inside the roof. In a device for opening and closing a front window of a construction machine configured to be slidable between the upper roller and the lower roller, the upper roller is formed to have a smaller diameter than the lower roller, and the front window is accommodated at a rear end portion of the guide groove. An upper roller holding member that elastically engages with the upper roller in a state of moving to the position and restrains the upper roller in the vertical and front-rear directions is provided, The portion Menmado is located the lower roller in a state of being moved to the collapsed position, in which the lower roller regulating member for regulating the vertical movement of the lower roller thus provided.

According to a second aspect of the present invention, in the structure of the first aspect, an inclined surface in a direction in which the gap between the lower roller regulating member and the lower roller is gradually decreased rearward is provided. It has been done.

[0012]

According to the above construction, when the front window is fully opened (stored), the upper roller is constrained by the upper roller holding member in the vertical and longitudinal directions, so that the upper roller restraining action restricts the movement of the entire window.

The lower roller regulating member regulates the vertical movement of the lower roller, that is, the front side of the front window.

By these two points, it is possible to effectively prevent rattling of the front window during storage and traveling.

Moreover, since the upper roller is formed to have a smaller diameter than the lower roller, and therefore a sufficient gap is secured between the roller and the guide groove, the upper roller is guided by the guide groove (especially at the corner) when the front window is opened. Part) and the front window can be opened smoothly.

By the way, in a front window fully open type cabin, the front window is usually locked at a storage position.

However, when the lower roller is located at the corner of the guide groove in the housed state, that is, when the downward force acts on the front window, the front window slides down as soon as the lock is released. There was a problem.

In this respect, according to the structure of the present invention, since the entire window is securely held in the storage position by the restraining action of the upper roller holding member in the front-rear direction, it is possible to surely prevent the front window from slipping off. To be prevented.

According to the second aspect of the invention, the gap between the lower roller and the lower roller regulating member (inclined surface) can be easily adjusted to 0 or a minimum dimension close to this, whereby the gap can be easily adjusted. The vertical movement of the lower roller can be reliably regulated.

[0020]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

In FIG. 1, reference numeral 1 is a cabin, and 2 is a front window provided on the front surface of the cabin 1.

The front window 2 is another side window (not shown),
Similar to the skylight and the like, the transparent glass plate 5 is fitted into the window frame 3 via the packing 4, and the closed position is located on the front surface of the cabin as shown by the solid line in FIG. 1 and the alternate long and short dash line in FIG. It is slidably attached between the chain double-dashed line in FIG. 1 and the chain double-dashed line in FIG. 3, and a storage position (fully open position) in which the roof is stored in a substantially horizontal posture as shown in FIG.

As a sliding means for the front window 2, FIG.
As shown in FIG. 4, upper rollers 6 and 6 are attached to the upper left and right sides of the window frame 3 of the window 2, and lower rollers 7 and 7 are attached to the lower left and right sides of the window frame 3 so as to be rotatable around a horizontal axis.

On the other hand, a pair of left and right guide grooves (only one side is shown) 8 into which the upper and lower rollers 6 and 7 are fitted are provided in the cabin 1 across the front surface of the cabin 1 and the inside of the roof portion, and , The front side vertical groove portion 8a and the roof side lateral groove portion 8b are provided in a curved state at a continuous corner portion 8c, and by the upper and lower rollers 6 and 7 rolling in the guide groove 8, The front window 2 moves (opens and closes) between a closed position and a storage position.

By the way, as shown in FIGS. 1 and 4, the horizontal frame 1a provided at the boundary between the front part and the roof part of the cabin 1 is oblique from the eyepoint (standard viewpoint of the driver) P in the cabin 1. A so-called blind spot is an area A located between the eye point P and a straight line passing through the front and rear ends of the horizontal frame 1a, which is located in the upper field of view.

Further, the lower frame 3 of the window frame 3 in the front window 2
a and the lower packing 4a are also located in the obliquely upper field of view in the stored state, and the lower frame 3a and the lower packing 4a
If a shifts back and forth with respect to the cabin lateral frame 1, the blind spot will further widen.

Therefore, in this embodiment, in order to narrow the blind spot as much as possible and improve the visibility, the lower window 3a and the lower packing 4a of the front window 2 are positioned so that the lower frame 3a and the lower packing 4a are located within the blind spot of the horizontal frame 1a in the housed state of the front window. The storage position (the positional relationship between the guide groove 8 and the upper and lower rollers 6, 7) is set.

As a result, the lower roller 7 is positioned at the corner portion 8c of the guide groove 8 in the state where the front window is housed.

The guide groove corner portion 8c is provided with a lower roller regulating member 9 for regulating the movement of the lower roller 7 when the front window is accommodated.

The lower roller regulating member 9 has an inclined surface 10a at the rear end of the lower surface 10 facing the lower roller 7 in a direction in which the clearance α between the lower roller 7 and the lower roller 7 gradually decreases rearward.
With a screw (not shown), the clearance α between the lower roller 7 and the inclined surface 10a has a predetermined dimension (for example, 0 m).
m to 1 mm). In the figure, 11,
Reference numeral 11 is a mounting hole.

The upper roller 6 is formed to have a diameter smaller than that of the lower roller 7, that is, a diameter dimension such that a sufficiently large gap is left between the upper roller 6 and the guide groove 8.

Therefore, when the front window 2 is opened, there is no risk that the upper roller 6 as a pioneer will be caught in the guide groove 8, especially the corner portion 8c, and the front window 2 can be slid smoothly.

However, as a result of the upper roller 6 having such a small diameter, there is a possibility that the rear side of the front window 2 may be largely rattled when traveling while the front window 2 is housed.

Therefore, as shown in FIG. 4, at the rear end of the guide groove 8 (the rear end of the lateral groove 8b), an upper roller holding member for restraining the upper roller 6 in the vertical and front-rear directions when the front window is housed. 12 are provided.

The upper roller holding member 12 is entirely made of a highly elastic material (usually plastic such as DURACON), and has a roller engaging portion 13 at its front end.

The roller engaging portion 13 is formed in a bifurcated shape, and the inner surface thereof is formed into a curved surface which can be fitted to a portion of the upper roller 6 which is more than half the circumference, and the upper roller 6 engages with the roller engaging portion 13 when the front window is stored. It fits in and is constrained in the up-down direction and the front-back direction by being elastically pinched from both the upper and lower sides. In FIGS. 4 and 6, 14 is a mounting hole for the upper roller holding member 12.

Thus, with the front window 2 housed, the rear end of the front window 2 is restricted by the upper roller holding member 12 and the front end thereof is restricted by the lower roller restricting member 9, so that the entire front window 2 rattles. Is effectively suppressed.

The front window 2 is locked in the storage position by a well-known lock pin (not shown) that is operated in a bartack type, and the lock by the lock pin is released when the front window 2 is moved to the closed position.

Here, as described above, according to the structure of this embodiment in which the lower roller 7 is located at the corner portion 8c of the guide groove 8 when the front window is stored, the downward force acts on the front window 2. As soon as the lock is released, the front window 2 may slide down.

In this case, according to this device, the upper roller 6
Is restrained in the front-rear direction by the upper roller holding member 12, and the upper roller 6 is held by the upper roller 6 unless the driver applies an operating force exceeding the elastic clamping force of the roller engaging portion 13. Slopes are surely prevented.

Other Embodiments (1) In the above embodiment, the lower roller 7 is held in the state where the front window is housed.
Is located in the guide groove corner portion 8c,
The present invention can be applied to the case where the lower roller 7 is located in the lateral groove portion 8b of the guide groove 8 in the same state, and
The intended purpose of preventing rattling when the front window 2 is stored can be achieved.

(2) As another embodiment of the upper roller holding member 12, a pair of upper and lower leaf springs is provided at the rear end portion of the guide groove 8 and the upper roller 6 is elastically pressed between the leaf springs to move the upper and lower portions. Also, a configuration of restraining in the front-back direction may be adopted.

[0043]

As described above, according to the present invention, the upper roller holding member is provided at the rear end portion of the guide groove, and the lower roller regulating member is provided at the portion of the guide groove where the lower roller is located when the front window is housed. Since the upper roller holding member restrains the upper roller in the vertical and front-back directions and the lower roller regulating member regulates the vertical movement of the lower roller when the front window is stored, the movement of both rollers can be stopped. Thus, it is possible to effectively prevent rattling of the front window during storage traveling.

Moreover, since the upper roller is formed to have a smaller diameter than the lower roller, and therefore a sufficient gap is secured between the roller and the guide groove, the upper roller is guided by the guide groove (especially at the corner) when the front window is opened. Part) and the front window can be opened smoothly.

Further, when the lower roller is positioned at the corner of the guide groove in the housed state, that is, when the downward force acts on the front window, the upper roller holding member restrains the front roller in the front-rear direction. Since the entire window is securely held in the storage position, there is no risk of the front window slipping down as soon as the storage lock of the front window is released.

According to the second aspect of the invention, the gap between the lower roller and the lower roller regulating member (inclined surface) can be easily adjusted to zero or a minimum dimension close to this, whereby the gap can be easily adjusted. The vertical movement of the lower roller can be reliably regulated.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing a positional relationship between a front window and a cabin in a front window opening / closing device according to an embodiment of the present invention.

FIG. 2 is a partially enlarged front view of a front window.

FIG. 3 is a side view showing a relationship between upper and lower rollers of a front window and a guide groove.

FIG. 4 is a partially enlarged view of FIG. 3;

FIG. 5 is a perspective view of a lower roller regulating member in the apparatus of the embodiment.

FIG. 6 is a perspective view of an upper roller holding member in the same device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cabin 2 Front window 6 Upper roller 7 Lower roller 8 Guide groove 9 Lower roller regulating member 10 Lower surface facing the lower roller of the same member 10a Sloping surface 12 Upper roller holding member 13 Roller engaging part of the same member

Claims (2)

[Claims] 1. An upper roller is provided on both left and right sides of an upper portion of a front window provided on a front surface of a cabin, and lower rollers are provided on both left and right sides of a lower portion. The front window is provided so as to straddle the inside, and is configured to be slidable between the closed position of the cabin front part and the storage position inside the roof part by the rolling operation of the upper and lower rollers in the guide groove. In a device for opening and closing a front window of a construction machine, the upper roller is formed to have a smaller diameter than the lower roller, and the rear end of the guide groove is elastic to the upper roller in a state where the front window is moved to a storage position. The upper roller holding member that locks the roller vertically and in the front-rear direction is provided while the upper window is moved to the storage position. An opening / closing device for a cabin front window in a construction machine, wherein a lower roller restricting member for restricting a vertical movement of the lower roller is provided at a portion where the partial roller is located. 2. The lower roller regulating member has a surface facing the lower roller, and an inclined surface in a direction in which a gap between the lower roller regulating member and the lower roller gradually decreases rearward is provided. Opening and closing device for the cabin front window in construction machinery.