Lower window holding structure

Abstract

To provide a lower window holding structure capable of reducing costs compared with the conventional structure and excellent in operability.SOLUTION: A lower window holding structure according to the present invention comprises a pair of slope portions 4c provided on the interior side of a pair of bulging portions 1a of the lower window 1 and inclined forward from above to below, abut against the bulging portion 1a and push the lower window 1 forward when the lower window 1 is moved downward from above, an outdoor side seal rubber 2 provided on the outdoor side of the front surface of a cabin and in contact with the outdoor side surface of the lower window 1 pushed out by the slope portion 4c, a receiving portion 5a that supports the lower end of the lower window 1, and an indoor side seal rubber 3 provided so that a gap above the outdoor side seal rubber 2 is larger than that below it on the interior side of the front of the cabin, and in which the indoor side surface of the lower window 1 contacts with the lower window 1 supported by the receiving portion 5a.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a lower window holding structure for holding a lower window provided on the front of a cabin of a construction machine. [Background technology]

[0002] A window provided on the front of the cabin of a construction machine is configured to be able to be opened and closed relative to the cabin so that, for example, an operator can carry out work while communicating with surrounding workers.

[0003] For example, Patent Document 1 discloses a structure for opening, closing, and holding an upper windshield. In this structure, a pair of left and right lock pins for fixing are provided at the top of the windshield, and a pair of left and right rollers are provided at the bottom of the windshield. Also, on the left and right sides of the interior of the cabin, there are provided a guide rail along which the rollers run, a member having a pin hole into which the lock pin is inserted, and a lower stopper that receives the rollers below.

[0004] In addition to the structure described in Patent Document 1, a structure is also known in which C-channel members with a C-shaped cross section are arranged on the left and right sides of the interior of the cabin, and a glass run is arranged inside the C-channel members, allowing the window to move up and down along the groove of the glass run.

[0005] There is also a known structure that uses a structure such as the lock pin and pin hole described in Patent Document 1 above, places seal rubber on the outside of the cabin, and holds the window pressed against the seal rubber from the inside of the cabin by engaging the lock pin with the pin hole. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 7-1957 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the structure shown in Patent Document 1 requires components such as a lock pin, rollers, guide rails, and a lower stopper, which increases the number of parts and leads to increased costs. In addition, in a structure using a C-channel material, force is required to slide the window against the glass run, and as the number of openings and closings increases, the sliding resistance increases, which may require a larger force during operation. Furthermore, a structure in which the window pressed against the seal rubber is held by the lock pin requires that the window be pressed against the seal rubber first, and then the lock pin and pin hole must be engaged in that state, which is problematic in terms of operability.

[0008] The present invention aims to solve such conventional problems, and has as its object to provide a lower window retaining structure that can reduce costs compared to conventional structures and is also easy to operate. [Means for solving the problem]

[0009] The present invention is a lower window holding structure for holding a lower window provided on the front of a cabin of a construction machine, comprising a pair of bulge portions provided on both ends of the lower window in the vehicle width direction and extending outward in the vehicle width direction, a pair of slope portions provided on the indoor side of the bulge portions, inclined forward from above to below, and contacting the bulge portions when the lower window is moved from above to below, thereby pushing the lower window forward, an exterior seal rubber provided on the outdoor side of the front of the cabin and contacting the outdoor side of the lower window pushed out by the slope portions, a receiving portion provided on the lower side of the front of the cabin and supporting the lower end of the lower window, and an interior seal rubber provided on the indoor side of the front of the cabin so that the gap above the exterior seal rubber is larger than below, and with which the indoor side of the lower window contacts when the lower window is supported by the receiving portion.

[0010] In such a lower window retaining structure, it is preferable that the exterior side sealing rubber has a pair of vertical rubber portions extending in the up and down direction at a distance in the vehicle width direction, and the interior side sealing rubber has a horizontal rubber portion extending along the vehicle width direction, and when viewed from the exterior side to the interior side, the lower portion of the vertical rubber portion and the outer edge portion of the horizontal rubber portion overlap, and the lower window supported by the receiving portion is clamped between the lower portion and the outer edge portion. Effect of the Invention

[0011] The lower window holding structure of the present invention eliminates the need for conventional parts such as lock pins, rollers, guide rails, and lower stoppers, thereby reducing costs. In addition, to hold the lower window, it is only necessary to move the lower window downward so that the bulge abuts against the slope, which is a simpler operation than the conventional method of pressing the window against the seal rubber and engaging the lock pin with the pin hole, resulting in excellent operability. [Brief description of the drawings]

[0012] [Figure 1] 1 is a perspective view showing the front of a cabin of a construction machine using an embodiment of a lower window holding structure according to the present invention, as viewed from the inside of the cabin, and a partially enlarged view thereof. [Diagram 2] 2A is a cross-sectional view taken along line AA shown in FIG. 1, and FIG. 2B is a cross-sectional view taken along line BB. [Diagram 3] 1. (a) is a view seen from the viewpoint along the arrow C shown in FIG. 1, and (b) is a view seen from the viewpoint along the arrow D shown in FIG. [Figure 4] These are figures showing the state of the lower window in the middle of being moved downward, where (a) is a view seen from the inside of the vehicle toward the outside, (b) is a view seen from the center of the lower window in the vehicle width direction toward the outside in the vehicle width direction, and (c) is a cross-sectional view along EE. [Diagram 5] These are figures showing the state when the lower window has completed moving downward, where (a) is a view seen from the inside of the vehicle toward the outside, (b) is a view seen from the center of the lower window in the vehicle width direction toward the outside in the vehicle width direction, and (c) is a cross-sectional view along the FF. [Figure 6] FIG. 2A is a perspective view of an exterior seal rubber in this embodiment, and FIG. 2B is a perspective view of an interior seal rubber in this embodiment. [Figure 7] FIG. 2 is a perspective view of a lower window in the embodiment. [Figure 8] FIG. 4 is a perspective view of a guide member in the embodiment; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an example of a lower window holding structure according to the present invention will be described with reference to the accompanying drawings.

[0014] Fig. 1 is a view showing the front of a cabin 10 of a construction machine using one embodiment of a lower window holding structure according to the present invention, viewed from the inside of the vehicle. The left-right direction of the cabin 10 shown in the figure corresponds to the vehicle width direction. The lower window holding structure of this embodiment includes a lower window 1, an exterior seal rubber 2 (see Figs. 2(a) and 4), an interior seal rubber 3, a guide member 4, and a receiving member 5 (see Fig. 3(a)).

[0015] The cabin 10 of this embodiment also includes an exterior plate 11 and an interior plate 12, as shown in Fig. 2(a), Fig. 3(b), and Fig. 4(c). On the left and right sides of the cabin 10, the exterior plate 11 and the interior plate 12 extend from the outside to the inside in the vehicle width direction as shown in Fig. 2(a), and on the lower side of the cabin 10, they extend from the bottom to the top as shown in Fig. 3(b) and Fig. 4(c). The cabin 10 also includes an upper window 13 above the lower window 1 as shown in Fig. 1.

[0016] The lower window 1 is made of a transparent plate glass or an acrylic plate. The lower window 1 of this embodiment is generally rectangular in shape as shown in Fig. 7, and has a pair of bulges 1a extending outward in the vehicle width direction at the upper portions of both left and right ends.

[0017] The exterior seal rubber 2 is made of an elastic material (e.g., rubber or thermoplastic elastomer) and is attached to the exterior side of the cabin 10 by the exterior plate 11. When attached to the exterior plate 11, the exterior seal rubber 2 of this embodiment has an exterior horizontal rubber part 2a extending along the vehicle width direction, and a pair of vertical rubber parts (exterior vertical rubber parts 2b) extending downward from both the left and right ends of the exterior horizontal rubber part 2a, as shown in Fig. 6(a). The lower part 2c of the exterior vertical rubber part 2b curves from the outside to the inside in the vehicle width direction. When the outdoor seal rubber 2 is attached to the cabin 10, the outdoor horizontal rubber part 2a contacts the upper end of the upper window 13 from the outside of the room, the upper half of the outdoor vertical rubber part 2b contacts the left and right end of the upper window 13 from the outside of the room, and the lower half of the outdoor vertical rubber part 2b contacts the left and right end of the lower window 1 from the outside of the room.

[0018] 2(a), 3(b), and 4(c), the exterior seal rubber 2 has a U-shaped cross section and includes a base 2d to be inserted into the exterior plate 11, a plurality of retaining ribs 2e provided on the inner peripheral surface of the base 2d, which come into contact with the exterior plate 11 when the base 2d is inserted into the exterior plate 11 to function as a retainer for the base 2d inserted into the exterior plate 11, and an elastic portion 2f located on the interior side of the base 2d. The cross section of the elastic portion 2f is basically ring-shaped as shown in the drawings, and the interior side of the ring-shaped portion is provided with a portion that protrudes from the inside to the outside in the vehicle width direction (or from the top to the bottom).

[0019] The interior seal rubber 3 is formed of a material having elasticity (e.g., rubber or thermoplastic elastomer) like the exterior seal rubber 2. The exterior seal rubber 2 and the interior seal rubber 3 may be made of the same material or different materials. When the interior seal rubber 3 is attached to the interior plate 12, as shown in FIG. 6(b), the interior seal rubber 3 has a horizontal rubber portion (interior horizontal rubber portion 3a) extending along the vehicle width direction, a pair of outer edge portions 3b extending in an arc shape from both the left and right sides of the interior horizontal rubber portion 3a, and a pair of interior vertical rubber portions 3c connected to the respective outer edge portions 3b with a gap in the vehicle width direction. As shown in FIG. 4(a), the upper portion of the interior vertical rubber portion 3c extends so as to spread outward in the vehicle width direction.

[0020] 2(a), 3(b) and 4(c), the indoor side seal rubber 3 has a U-shaped cross section and is provided with a base 3d to be inserted into the indoor side plate 12, a plurality of retaining ribs 3e provided on the inner peripheral surface of the base 3d, which come into contact with the indoor side plate 12 when the base 3d is inserted into the indoor side plate 12 to function as a retainer for the base 3d inserted into the indoor side plate 12, and an elastic part 3f located on the outdoor side of the base 3d and having a ring-shaped cross section. Note that the elastic part 3f is omitted in the upper part of the indoor side vertical rubber part 3c as shown in FIG. 2(a).

[0021] Such an outdoor seal rubber 2 and an indoor seal rubber 3 are attached to the cabin 10 in the state shown in Fig. 4(a) and (b). That is, the outdoor seal rubber 2 and the indoor seal rubber 3 are attached so that the outdoor vertical rubber part 2b and its lower part 2c overlap the indoor vertical rubber part 3c and the outer edge part 3b when viewed from the outdoor side toward the indoor side. As shown in Fig. 4(a), the lower part 2c of the outdoor vertical rubber part 2b extends so as to intersect with the outer edge part 3b, and the lower end part of the lower part 2c is located below the outer edge part 3b. Also, the indoor seal rubber 3 is attached so that the gap above the outdoor seal rubber 2 is larger than the gap below it (so that the indoor seal rubber 3 is inclined toward the indoor side relative to the outdoor seal rubber 2 when viewed from the side) as shown in Fig. 4(b). The gap below the outdoor-side seal rubber 2 and the indoor-side seal rubber 3 is smaller than the thickness of the lower window 1, or the outdoor-side seal rubber 2 and the indoor-side seal rubber 3 come into contact below. In this embodiment, the outdoor-side seal rubber 2 and the indoor-side seal rubber 3 come into contact where the lower portion 2c and the outer edge portion 3b are located, as shown in Figure 4(b).

[0022] The guide member 4 is made of synthetic resin and is attached to the outside of the cabin 10. As shown in Fig. 8, the guide member 4 has an overall rectangular parallelepiped shape and includes a mounting portion 4a which is attached to the cabin 10 with screws or the like, a connecting portion 4b which is L-shaped in cross section and protrudes from the mounting portion 4a to the inside of the room, and a slope portion 4c which is provided on the outside of the connecting portion 4b and slopes downward so as to protrude to the outside of the room. As shown in Fig. 2(b), the gap between the mounting portion 4a and the lower end of the slope portion 4c is approximately the same as the thickness of the lower window 1 or slightly larger than that.

[0023] Such guide members 4 are provided on the left and right sides of the cabin 10 with the slope portions 4c positioned on the interior side relative to the bulging portion 1a of the lower window 1 as shown in Figs.

[0024] The receiving member 5 is cylindrical as shown in Figure 3(a) and has a receiving portion 5a that supports the lower end of the lower window 1, and a male threaded portion 5b that is male threaded and allows the height of the receiving portion 5a to be adjusted relative to the cabin 10.

[0025] In a lower window holding structure constructed using such components, for example, when an operator is working while communicating with surrounding workers, the lower window 1 can be removed from the cabin 10 by simply pulling the lower window 1 upward.

[0026] When installing the removed lower window 1, the lower window 1 is inserted between the exterior seal rubber 2 and the interior seal rubber 3 with the bulging portion 1a facing upward, as shown in Figure 4, and then moved downward. Note that because the gap between the exterior seal rubber 2 and the interior seal rubber 3 at the top is larger than the thickness of the lower window 1, the lower window 1 can be moved downward without resistance.

[0027] When the bulging portion 1a comes into contact with the slope portion 4c as shown in FIG. 2(b), the lower window 1 is pushed outward by the slope portion 4c, so that the exterior seal rubber 2 comes into contact with the exterior surface of the lower window 1 as shown in FIG. 2(a). Since the elastic portion 2f is provided on the indoor side of the exterior seal rubber 2, the exterior seal rubber 2 comes into contact with the lower window 1 in a state in which the elastic portion 2f is elastically deformed. Furthermore, when the lower window 1 moves downward, the lower end of the lower window 1 is inserted between the lower portion 2c of the exterior seal rubber 2 and the outer edge portion 3b of the interior seal rubber 3 as shown in FIG. 5(a). As described above, the elastic portion 2f is provided on the indoor side of the exterior seal rubber 2, and the elastic portion 3f is provided on the outdoor side of the interior seal rubber 3, so that the lower end of the lower window 1 is sandwiched by the elastic deformation of both the elastic portion 2f and the elastic portion 3f as shown in FIG. 5(c). The lower end of the lower window 1 is supported by a receiving part 5a, which is height-adjustable, as shown in Fig. 3(a), and is therefore held in a specified position. When the lower end of the lower window 1 is supported by the receiving part 5a, the bulge 1a located at the top of the lower window 1 fits between the mounting part 4a and the lower end of the slope part 4c, as shown in Fig. 2(b), so the upper part of the lower window 1 does not wobble towards the outside or inside of the room.

[0028] In this way, in the lower window holding structure of this embodiment, the exterior seal rubber 2 and the interior seal rubber 3 come into contact with the lower window 1 only in the latter half of the lower window 1 being moved downward, so there is no need to continue to apply a large force when attaching the lower window 1, and the operability is excellent. In addition, from the perspective from the exterior to the interior, the lower part 2c of the exterior seal rubber 2 and the outer edge part 3b of the interior seal rubber 3 overlap, so that the invisible area of ​​the lower window 1 is minimized, and the visibility of the operator performing the operation in the cabin 10 can be ensured. In addition, when the lower window 1 is attached, the exterior side of the lower window 1 is watertight by the exterior seal rubber 2, and the interior side is watertight by the interior seal rubber 3, so that it is possible to prevent the intrusion of rainwater and the like from the outside. In addition, since parts such as lock pins, rollers, guide rails, and lower stoppers that were previously used are required, it is also possible to reduce costs.

[0029] Although one embodiment of the present invention has been described above, the present invention is not limited to the specific embodiment, and various modifications and changes are possible within the scope of the spirit of the present invention described in the claims unless otherwise specifically limited in the above description. Furthermore, the effects of the above embodiment are merely examples of the effects resulting from the present invention, and do not mean that the effects of the present invention are limited to the above effects. [Explanation of symbols]

[0030] 1: Lower window 1a:bulge 2:Outside sealing rubber 2b: Outdoor vertical rubber part (vertical rubber part) 2c: Lower part 3: Indoor sealing rubber 3a: Indoor side horizontal rubber part (horizontal rubber part) 3b: Outer edge 4c: Slope section 5a: Receiving part 10: Cabin

Claims

1. A lower window holding structure for holding a lower window provided on a front surface of a cabin of a construction machine, A pair of bulging portions provided at both ends of the lower window in a vehicle width direction and extending outward in the vehicle width direction; A pair of slope sections are provided on the indoor side of the bulging section, inclined forward from above to below, and abut against the bulging section when the lower window is moved from above to below, thereby pushing the lower window forward; An exterior seal rubber is provided on the exterior side of the front surface of the cabin and comes into contact with the exterior side surface of the lower window pushed out by the slope portion; A receiving portion provided on a lower side of the cabin front surface and supporting a lower end portion of the lower window; A lower window retaining structure comprising: an indoor side seal rubber that is arranged on the indoor side of the front of the cabin so that the gap above the outdoor side seal rubber is larger than the gap below, and that comes into contact with the indoor side of the lower window when the lower window is supported by the receiving portion.

2. The exterior seal rubber has a pair of vertical rubber portions extending vertically at an interval in the vehicle width direction, The interior seal rubber has a horizontal rubber portion extending along the vehicle width direction, The lower window retaining structure described in claim 1, wherein, when viewed from the outside to the inside of the room, the lower part of the vertical rubber part and the outer edge part of the horizontal rubber part overlap, and the lower window supported by the receiving part is clamped between the lower part and the outer edge part.

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