JP2020041383A - Cab for construction machine - Google Patents

Abstract

To provide a cab for a construction machine which does not depend on assembly accuracy of a cab frame and can easily arrange a rail.SOLUTION: A cab 1 for a construction machine includes a cab frame 3 having an opening 2 formed on a front surface, a window frame 4 which is formed separately from the cab frame 3 and is mounted on the opening 2, a pair of first rails 5 which are provided on the window frame 4 so as to be separated in a horizontal direction and extend in a vertical direction, a pair of right and left second rails 6 which are provided on the first rail 5 and extend rearward, and a movable window 7 which has a lower travel part traveling along the first rail 5 and has an upper travel part traveling along the second rail 6.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a cab for a construction machine.

  A construction machine such as a hydraulic shovel performs various operations such as excavation and loading of earth and sand on a dump truck.

  For this reason, some cabs of such construction machines have movable windows that can be flipped up.

  Such a movable window is formed in a quadrangular shape, and has rollers at four corners, up, down, left, and right. These rollers are formed so as to be able to run along rails provided on both left and right sides of the movable window. When the movable window is flipped up, the lower roller travels upward and the upper roller travels rearward.

JP 2008-307919 A

  Incidentally, the left and right rails need to be arranged in parallel at a predetermined interval. However, the left and right rails are assembled to the front pillar and the roof rail by welding. For this reason, the interval between the left and right rails depends on the assembly accuracy of the cab frame, and high accuracy is required for the cab frame. Also, when welding the rail to the cab frame, there is a possibility that welding distortion may occur. For this reason, the rails must be welded while holding the cab frame using a large-sized docking assembly welding jig or the like, which is one of the reasons why productivity cannot be improved.

  Therefore, the present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a cab for a construction machine in which rails can be easily arranged without depending on the assembly accuracy of a cab frame.

According to one aspect of the present disclosure,
A cab frame with an opening formed on the front,
A window frame formed separately from the cab frame and attached to the opening;
A pair of first rails which are provided on the window frame at right and left distances and extend in a vertical direction;
A pair of left and right second rails provided on the first rail or the window frame and extending rearward;
A cab for a construction machine, comprising: a movable window having a lower traveling portion traveling along the first rail and an upper traveling portion traveling along the second rail.

  Preferably, a rear portion of the second rail is provided on the cab frame so as to be adjustable in a lateral direction.

  Preferably, the cab frame includes a roof reinforcement and a rear header extending in a vehicle width direction, and a rear portion of the second rail is provided on the roof reinforcement or the rear header so as to be position-adjustable in the left-right direction. Can be

  Preferably, a lock member provided on the window frame, and a locked member provided on the movable window and removably locked to the lock member when the movable window is moved to a position to close the window frame. Is provided.

  Preferably, the window frame includes a frame body portion that is loosely fitted in the opening, and a flange portion provided in the frame body portion and abutting on the cab frame from the front.

  Preferably, the flange is fastened or bonded to the cab frame.

  According to the above aspect, the rails can be easily arranged without depending on the assembly accuracy of the cab frame.

1 is an exploded perspective view of a cab for a construction machine according to an embodiment of the present disclosure. It is an exploded perspective view of a cab frame. FIG. 2 is a sectional view taken along line AA of FIG. 1. FIG. 2 is a sectional view taken along line BB of FIG. 1. FIG. 2 is a sectional view taken along line CC of FIG. 1. It is the side view which looked at the window frame from the inside. FIG. 7 is a sectional view taken along line DD of FIG. 6. It is a perspective view of a cab for construction machines. FIG. 9 is a sectional view taken along line EE of FIG. 8. FIG. 9 is a sectional view taken along line FF of FIG. 8. It is the side view which looked at the window frame which shows other embodiment from the inside.

  Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. The directions of front, rear, left, right, up, and down in the embodiments described below refer to the respective directions of the cab for construction machinery.

  FIG. 1 is an exploded perspective view of a construction machine cab 1 according to the present disclosure.

  As shown in FIG. 1, a cab 1 for a construction machine includes a cab frame 3 having an opening 2 formed on a front surface thereof, a window frame 4 mounted on the opening 2, and a vertically extending direction provided on the window frame 4. A first rail 5, a second rail 6 provided on the first rail 5 and extending rearward, a movable window 7 running along the first rail 5 and the second rail 6, and a window frame below the first rail 5. 4 and a fixed window 8 provided in the apparatus.

  As shown in FIG. 2, the cab frame 3 includes a right side panel 9 forming a right side surface, a left side panel 10 forming a left side surface, and a front side provided between lower ends of the right side panel 9 and the left side panel 10. A cross member 11 and a rear cross member 12, a front header 13 and a rear header 14 provided between upper end portions of the right side panel 9 and the left side panel 10, and a construction machine provided between the right side panel 9 and the left side panel 10. The cab 1 includes a roof panel 15 constituting a ceiling, and a roof reinforcement 16 provided between the right side panel 9 and the left side panel 10 to reinforce the ceiling.

  The right side panel 9 and the left side panel 10 are configured by providing a panel plate 18 on a frame 17 formed in a frame shape. The skeleton portion 17 includes a side rail 19 extending in the front-rear direction, a front pillar 20 connected to a front end of the side rail 19, a roof rail 21 extending rearward from an upper end of the front pillar 20, and a rear end of the roof rail 21 and the side rail 19. And a rear pillar 22 disposed therebetween. The front pillar 20 and the roof rail 21 are formed by bending one deformed pipe. As shown in FIG. 3, the deformed tube is formed to have a cross-sectional shape. For example, a deformed pipe is formed by forming a pipe having a circular cross section and then deforming the pipe into an arbitrary shape by drawing or the like.

  The opening 2 is defined by left and right front pillars 20, a front cross member 11, and a front header 13. That is, the opening 2 occupies most of the front surface of the cab frame 3 and is formed in a rectangular shape when viewed from the front.

  The front cross member 11, the rear cross member 12, the front header 13, the rear header 14, and the roof reinforcement 16 extend in the left-right direction. Further, the front cross member 11, the rear cross member 12, the front header 13, the rear header 14, and the roof reinforcement 16 have one end welded to the left side panel 10 and the other end welded to the right side panel 9. .

  The roof panel 15 is provided on the upper surfaces of the left and right roof rails 21, the front header 13, the rear header 14, and the roof reinforcement 16.

  As shown in FIGS. 1, 4 and 6, the window frame 4 includes a frame body 23 inserted into the opening 2 and a flange provided on the frame body 23 and abutting against the cab frame 3 from the front. Unit 24.

  The frame main body 23 is formed in a rectangular frame shape along the inner peripheral shape of the opening 2. The frame body 23 is loosely fitted in the opening 2. That is, the outer dimensions of the frame body 23 in the vertical and horizontal directions are slightly smaller than the opening 2. Thereby, the assembly error of the cab frame 3 can be absorbed. Further, the position of the frame body 23 with respect to the opening 2 in the vertical and horizontal directions can be adjusted. The frame main body portion 23 is disposed between the left and right sides and extends in the vertical direction. The upper frame portion 26 is disposed between the upper ends of the side frame portions 25 and extends in the horizontal direction. The frame main body portion 23 is disposed between the lower ends of the side frame portions 25. And a lower frame 27 extending in the left-right direction.

  The side frame 25 has a substantially U-shaped cross section. Specifically, the side frame portion 25 includes a side plate portion 25a extending in the vertical direction and extending in the front-rear direction, a front plate portion 25b bent from the front end of the side plate portion 25a to the inner peripheral side of the window frame 4, and a side plate portion. A rear plate portion 25c bent from the rear end of the window frame 4 to the inner peripheral side of the window frame 4; A weather strip 28 for receiving the window glass 33 of the movable window 7 is provided on the rear surface of the front plate 25b. The front plate portion 25b and the weather strip 28 constitute a window receiving portion 29 that receives the outer peripheral portion of the movable window 7 from the front. The tip of the rear plate portion 25c (the tip on the inner peripheral side of the window frame 4) is bent forward. Thereby, the front end of the rear plate portion 25c faces the opposite side of the operator in the cab 1 for the construction machine.

  The flange portion 24 is provided integrally on the front surface of the front plate portion 25b of the frame body portion 23, and is provided integrally therewith and protrudes from the frame body portion 23 to the outer peripheral side. Thus, when the frame body 23 is inserted into the opening 2 from the front, the flange 24 abuts on the left and right side rails 19, the front cross member 11, and the front header 13 from the front. The flange portion 24 is fastened to the cab frame 3 by bolts, rivets, or the like. Note that the flange portion 24 may be bonded to the cab frame 3 with an adhesive or the like.

  The first rail 5 and the second rail 6 are formed in a U-shaped cross section. The first rail 5 extends in the up-down direction and is attached to the left and right side plates 25a of the frame main body 23 by welding or the like with the U-shaped opening facing inward. The lower end of the first rail 5 is arranged in the middle of the window frame 4 in the vertical direction. The lower end of the first rail 5 is formed obliquely with respect to the window receiving portion 29 so as to approach the front window receiving portion 29 as it goes downward. Thereby, when the movable window 7 travels downward along the lower portion of the first rail 5, the movable window 7 is pressed against the window receiving portion 29. The upper end of the first rail 5 is bent so that the tip is directed rearward.

  As shown in FIGS. 6 and 7, the second rails 6 extend in the front-rear direction and are connected to the upper ends of the first rails 5 with the U-shaped opening facing inward. Specifically, a sheath 30 for inserting the second rail 6 is provided integrally with the upper end of the first rail 5. The sheath 30 has a C-shaped cross section. The front half of the sheath 30 is arranged so as to surround the outer periphery of the upper end of the first rail 5 and is welded to the outer peripheral surface of the first rail 5. The rear half of the sheath 30 projects rearward from the first rail 5. The rear end of the sheath 30 is opened. The second rail 6 is fitted into the sheath 30 by being inserted into the sheath 30 from the rear, and is abutted on the first rail 5 and locked. The inner dimension of the sheath 30 in the left-right direction is slightly larger than the outer dimension of the second rail 6 in the left-right direction. Thereby, the position of the rear part of the second rail 6 fitted to the sheath part 30 can be adjusted in the left-right direction. The shape of the sheath 30 is not limited to this. For example, the sheath portion 30 may be formed in a tubular shape having a rectangular cross section. Although the sheath 30 is provided at the upper end of the first rail 5, the sheath 30 may be provided at the front end of the second rail 6 instead.

  As shown in FIG. 10, the rear portion of the second rail 6 is provided on the cab frame 3 so as to be position-adjustable in the left-right direction. Specifically, the second rail 6 includes a bracket 31 at a rear portion. The bracket 31 is bolted to the lower surface of the roof reinforcement 16 so that the position can be adjusted in the left-right direction. The bracket 31 has an elongated hole (not shown) through which the bolt 32 is inserted. The long hole is formed long in the left-right direction. Thereby, the position of the rear part of the second rail 6 can be adjusted in the left-right direction while the bolt 32 is temporarily fixed to the roof reinforcement 16. The bracket 31 may be bolted to the front or rear surface of the roof reinforcement 16 so that the position of the bracket 31 can be adjusted in the left-right direction. Further, the bracket 31 may be bolted to the rear header 14 so that the position can be adjusted in the left-right direction, or may be bolted to another position of the cab frame 3 so that the position can be adjusted in the left-right direction.

  As shown in FIGS. 1 and 5, the movable window 7 is provided at a window glass 33 formed in a rectangular plate shape, a holding frame 34 that holds an outer peripheral portion of the window glass 33, and four corners of the holding frame 34. Rollers 35a and 35b. The holding frame 34 is formed in a rectangular shape along the outer periphery of the window glass 33. The holding frame 34 is provided with a stay 36 for rotatably supporting the rollers 35a and 35b. The stay 36 is formed in an L-shaped cross section. The stay 36 includes a fixing portion 36a fixed to the rear surface of the holding frame 34 by welding or the like, and a rear extension portion 36b bent from the fixing portion 36a and extending rearward. The rollers 35a and 35b include a shaft portion 37 provided on the rear extension portion 36b and extending outward in the left-right direction, and a wheel 38 rotatably provided on the shaft portion 37. The upper roller 35 a disposed above the movable window 7 is engaged with the second rail 6. The lower roller 35 b disposed below the movable window 7 is engaged with the first rail 5. Note that the upper roller 35a may not be a roller as long as it is an upper traveling unit that travels along the second rail 6. For example, the upper traveling unit may be configured by an upper slider (not shown) that slides along the second rail 6. Similarly, the lower roller 35b may not be a roller as long as it is a lower traveling unit that travels along the first rail 5. For example, the lower traveling section may be constituted by a lower slider (not shown) that slides along the first rail 5.

  As shown in FIGS. 1 and 7, the construction machine cab 1 is moved to a position where the first striker 39 provided on the window frame 4 and the movable window 7 provided on the movable window 7 close the window frame 4. And a first lock member 40 that is locked to be detachable from the first striker 39 at times.

  The construction machine cab 1 is provided with a second striker (not shown) provided on the rear header 14, and is provided on the movable window 7 and is removably locked to the second striker when the movable window 7 is flipped up. And a second lock member 41 to be provided.

  FIG. 8 is a perspective view of the cab with the window frame 4 attached to the cab frame 3 and the movable window 7 attached to the window frame 4. FIG. 9 is a sectional view taken along line EE of FIG.

  As shown in the figure, when the movable window 7 is closed, the outer peripheral portion of the front surface of the window glass 33 is crimped to the weather strip 28 over the entire circumference. At this time, the upper roller 35a of the movable window 7 is inserted into the first rail 5, and the first lock member 40 (see FIG. 1) is locked by the first striker 39 (see FIG. 7). Thereby, the window glass 33 is liquid-tightly pressed to the weather strip 28.

  Next, the operation of the present embodiment will be described.

  When manufacturing the cab 1 for a construction machine, first, the cab frame 3, the window frame 4, the first rail 5, the second rail 6, and the movable window 7 are separately manufactured.

  When the cab frame 3 is manufactured, the front cross member 11, the front header 13, the rear cross member 12, and the rear header 14 are welded to the right side panel 9 and the left side panel 10. Thereafter, the roof reinforcement 16 is provided between the roof rails 21 of the right side panel 9 and the left side panel 10 by welding or the like. At this time, the interval between the first rail 5 and the second rail 6 on the left and right does not depend on the accuracy of the cab frame 3. For this reason, the cab frame 3 can be manufactured with lower accuracy than before, and the cab frame 3 can be manufactured efficiently in a short time. Particularly, the deformed pipes forming the front pillars 20 and the roof rails 21 are easily twisted when bent, and it is difficult to obtain accuracy. For this reason, the required accuracy is reduced, so that the productivity of the cab frame 3 is greatly improved.

  The distance between the first rail 5 and the second rail 6 on the left and right depends on the accuracy of the window frame 4. Therefore, the window frame 4 needs to be manufactured with relatively high accuracy. However, the window frame 4 is much smaller and lighter than the cab frame 3. Also, the cross-sectional shape is simple. For this reason, there is no difficulty in manufacturing the window frame 4 with relatively high accuracy. Furthermore, the cab frame 3 and the window frame 4 can be manufactured simultaneously in parallel. In this case, the cab frame 3 and the window frame 4 can be efficiently manufactured in a short time.

  Next, the first rail 5 is attached to the window frame 4 by welding. At this time, the window frame 4 is fixed with a jig so that welding distortion does not occur in the window frame 4. Conventionally, the first rail 5 and the second rail 6 have been welded to the deformed pipes forming the front pillar 20 and the roof rail 21. Therefore, in order to prevent welding distortion due to this welding, it is necessary to fix the entire cab frame 3 with a docking assembly welding jig (not shown) or the like, which has been a large-scale operation. Further, when welding distortion occurs in the front pillar 20 or the roof rail 21, it is not easy to correct the distortion. However, in the present embodiment, the first rail 5 is welded to the window frame 4, and the second rail 6 is loosely fitted to the sheath 30 of the first rail 5 in an outfitting process. For this reason, the first rail 5 can be easily welded to the window frame 4 only by fixing the window frame 4 with a relatively small jig. Even when welding distortion occurs in the window frame 4, the welding distortion can be relatively easily corrected because the window frame 4 is smaller than the cab frame 3 and has a simple cross-sectional shape.

  Thereafter, the movable window 7 and the fixed window 8 are assembled to the window frame 4. Specifically, first, the lower roller 35b and the upper roller 35a of the movable window 7 are fitted to the first rails 5 on the left and right. Thereby, the window frame 4, the movable window 7, and the fixed window 8 are modularized.

  Next, the window frame 4 to which the first rail 5, the movable window 7, and the fixed window 8 are attached is attached to the cab frame 3. In this case, first, the frame main body 23 of the window frame 4 is inserted into the opening 2 of the cab frame 3 from the front. At this time, the outer dimensions of the frame body 23 in the vertical and horizontal directions are smaller than the dimensions of the opening 2 in the vertical and horizontal directions. Therefore, the frame main body 23 can be easily inserted into the opening 2. Thereafter, the position of the window frame 4 is adjusted by moving the window frame 4 within the opening 2. Thereafter, the flange portion 24 of the window frame 4 is fastened to the front surface of the cab frame 3 with bolts, rivets, or the like. Therefore, when the window frame 4 is attached to the cab frame 3, welding distortion does not occur in the window frame 4. Further, the window frame 4 can be easily attached to the cab frame 3.

  Thereafter, the front end of the second rail 6 is inserted into the sheath 30 of the first rail 5 from behind and loosely fitted, and the bracket 31 of the second rail 6 is bolted to the roof reinforcement 16 of the cab frame 3. To temporarily stop. Thereafter, the position of the bracket 31 with respect to the roof reinforcement 16 is adjusted so that the left and right second rails 6 are in a parallel posture, and the bracket 31 is fastened to the roof reinforcement 16. As a result, the upper roller 35a can travel in the front-rear direction along the second rail 6.

  Note that the movable window 7 and the fixed window 8 are provided in the opening 2 of the cab frame 3 together with the window frame 4 after being assembled to the window frame 4 in advance, but the present invention is not limited to this.

  For example, after assembling the window frame 4 into the opening 2, the lower roller 35 b and the upper roller 35 a of the movable window 5 are fitted to the first rail 5 provided in the window frame 4, and the sheath 30 of the first rail 5 is fitted. Then, the front end of the second rail 6 may be inserted from behind and loosely fitted, and then the bracket 31 may be fastened to the roof reinforcement 16. In this case, the fixed window 8 may be assembled to the window frame 4 at any timing.

  After assembling the window frame 4 into the opening 2, the front end of the second rail 6 is inserted into the sheath 30 of the first rail 5 from the rear and loosely fitted, and the lower roller 35 b and the upper roller 35a are sequentially fitted to the second rail 6, the lower roller 35b is moved forward and downward along the second rail 6 and the first rail 5, and the upper roller 35a is moved forward along the second rail 6. Then, the bracket 31 may be fastened to the roof reinforcement 16.

  As described above, the cab 1 for construction equipment according to the present embodiment includes the cab frame 3 in which the opening 2 is formed, and the window frame 4 formed separately from the cab frame 3 and attached to the opening 2. A pair of left and right first rails 5 provided on the window frame 4 and extending in the vertical direction; a pair of left and right second rails 6 provided on the first rails 5 and extending rearward; A movable window 7 having a lower roller 35b running along the second rail 6 and having an upper roller 35a running along the second rail 6 is provided. For this reason, the interval between the left and right of the first rail 5 and the second rail 6 does not depend on the mounting accuracy of the cab frame 3, and the mounting accuracy of the cab frame 3 can be reduced. Further, since the first rail 5 is welded to the window frame 4 smaller than the cab frame 3, the welding operation can be simplified, and the first rails 5 can be easily arranged in parallel. And the productivity of the cab 1 for construction machines can be raised.

  The rear portion of the second rail 6 is provided on the cab frame 3 so as to be adjustable in the left-right direction. Therefore, the parallelism of the second rail 6 can be easily adjusted.

  The window frame 4 includes a frame body 23 that is loosely fitted in the opening 2 and a flange 24 that is provided in the frame body 23 and abuts on the cab frame 3 from the front. For this reason, the assembly error of the cab frame 3 can be absorbed, and the position of the frame main body 23 with respect to the opening 2 can be adjusted. Further, the position of the window frame 4 in the front-rear direction with respect to the cab frame 3 can be easily adjusted.

  The flange portion 24 is fastened or bonded to the cab frame 3. Therefore, no welding distortion is generated in the window frame 4. Further, the window frame 4 can be easily attached to the cab frame 3.

As described above, the embodiments of the present disclosure have been described in detail. However, the present disclosure is also applicable to the following other embodiments.
(1) As shown in FIG. 11, the sheath 30 may be provided on the side plate 25a. In this case, a lid member 30a for contacting the second rail 6 may be provided at the front end of the sheath portion 30. Further, a cap 5a for ensuring aesthetics and safety may be provided at the tip of the upper end of the first rail 5. The operation of attaching the cap 5a to the first rail 5 may be performed after the lower roller 35b is engaged with the first rail 5. Further, the second rail 6 may be rotatably connected to the upper end of the first rail 5 in advance by a hinge (not shown).
(2) The fixed window 8 may be omitted. In this case, the movable window 7 or another movable window (not shown) may be arranged at the position of the fixed window 8.

  The configurations of the above-described embodiments can be partially or wholly combined unless there is a particular contradiction. The embodiments of the present disclosure are not limited to the above-described embodiments, but include all modifications, applications, and equivalents included in the spirit of the present disclosure defined by the claims. Therefore, the present disclosure should not be construed as limiting, but can be applied to any other technology belonging to the scope of the idea of the present disclosure.

Reference Signs List 1 Cab for construction machine 2 Opening 3 Cab frame 4 Window frame 5 First rail 6 Second rail 7 Movable window 8 Fixed window 9 Right side panel 10 Left side panel 11 Front cross member 12 Rear cross member 13 Front header 14 Rear header 15 Roof Panel 16 Roof Reinforcement 17 Skeleton 18 Panel Plate 19 Side Rail 20 Front Pillar 21 Roof Rail 22 Rear Pillar 23 Frame Body 24 Flange 25 Side Frame 25a Side Plate 25b Front Plate 25c Rear Plate 26 Upper Frame 27 Lower frame part 28 Weather strip 29 Window receiving part 30 Sheath part 31 Bracket 32 Bolt 33 Window glass 34 Holding frame 35a Upper roller (roller)
35b Lower roller (roller)
36 Stay 36a Fixed portion 36b Backward extension 37 Shaft 38 Wheel 39 First striker 40 First lock member 41 Second lock member

Claims (6)

A cab frame with an opening formed on the front,
A window frame formed separately from the cab frame and attached to the opening;
A pair of first rails which are provided on the window frame at right and left distances and extend in a vertical direction;
A pair of left and right second rails provided on the first rail or the window frame and extending rearward;
A cab for a construction machine, comprising: a movable window having a lower traveling portion traveling along the first rail and an upper traveling portion traveling along the second rail.   The cab for a construction machine according to claim 1, wherein a rear portion of the second rail is provided on the cab frame so as to be position-adjustable in the left-right direction. The cab frame includes a roof reinforcement and a rear header extending in a vehicle width direction,
The cab for a construction machine according to claim 1, wherein a rear portion of the second rail is provided on the roof reinforcement or the rear header so as to be position-adjustable in the left-right direction. A lock member provided on the window frame; and a locked member provided on the movable window and locked to be detachably locked to the lock member when the movable window is moved to a position to close the window frame. The construction machine cab according to any one of claims 1 to 3. The window frame, a frame body portion loosely fitted in the opening,
The cab for a construction machine according to any one of claims 1 to 4, further comprising: a flange provided on the frame main body and abutting against a cab frame from the front. The cab for a construction machine according to claim 5, wherein the flange portion is fastened or bonded to the cab frame.

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