JP4783922B2 - Backhoe cabin - Google Patents

Description

  The present invention relates to the structure of a backhoe cabin.

Conventionally, a cabin-type backhoe that covers a maneuvering part with a cabin so that it can work comfortably even in rainy weather, cold regions, and summer is well known, and the side of the cabin is used to enter and exit the cabin. A door is provided, and the door can be opened and closed with a vertical axis on the rear side as a fulcrum, and a sliding door type or a folding door is also used in order to prevent the door from protruding when opened. For example, there are techniques disclosed in Japanese Utility Model Publication No. 6-85455, Japanese Patent Application Laid-Open No. 11-100844, and Japanese Patent No. 2657541.
Japanese Utility Model Publication No. 6-85455 Japanese Patent Laid-Open No. 11-100844 Japanese Patent No. 2657541

  As shown in FIG. 21, in the conventional connecting structure of the door glass 50, 50 of the folding door, an elastic body 51 made of rubber or the like for sealing is provided on the end surface of the door glass 50, 50. The hinge plates 52 and 52 are fixed to the door glass 50 and 50 by bolts 53 and 53, and the hinge plates 52 and 52 are pivotally supported by a pivot shaft 54. Further, as shown in FIG. 22, the elastic body 51 is divided into left and right parts, and one elastic body 51a is in contact with the other elastic body 51b so that there is no gap when opening and closing.

  In such a configuration, when the door 15 'is opened, the door 15' is opened outward, and the rear door 15a 'and the front door 15b' are bent inward. In the case of FIG. 21, since the pivot shaft 54 is not located on the extension line in the center in the thickness direction of the door glass 50, 50, the elastic body 51 bends and expands and contracts every time the door 15 'is opened and closed. Was repeated, and the life was shortened. In the configuration of FIG. 22, a gap is formed when the elastic body 51 deteriorates, and a gap is formed when dust or the like enters the contact portion.

  Therefore, an object of the present invention is to provide a backhoe cabin capable of extending the life of a seal member disposed in a middle folding portion of a middle folding door.

  The problem to be solved by the present invention is as described above. Next, means for solving the problem will be described.

The backhoe cabin according to claim 1, wherein the door (15) is divided into a rear door (15a) and a front door (15b) and both are pivotally supported by a hinge (24). The center of the pivot shaft (26) of (24) is positioned on the extension of the center line (O1) in the thickness direction of both door glasses (50, 50) constituting the rear door (15a) and the front door (15b). The end portions of the door glasses (50, 50) are connected to each other by a seal member (27), and the seal member (27) is connected to bypass the pivot shaft (26) of the hinge (24). It is set as the structure which carries out .

Since the present invention is configured as described above, the following effects can be obtained.
The backhoe cabin according to claim 1, wherein the door (15) is divided into a rear door (15a) and a front door (15b), and both are pivotally supported by a hinge (24). The center of the pivot shaft (26) of (24) is positioned on the extension of the center line (O1) in the thickness direction of both door glasses (50, 50) constituting the rear door (15a) and the front door (15b). The end portions of the door glasses (50, 50) are connected to each other by a seal member (27), and the seal member (27) is connected to bypass the pivot shaft (26) of the hinge (24). When the door is bent when the door is opened and closed, the hinge and the seal member are separately rotated and expanded and contracted in a state where the distance between the glass of the doors does not change, and there is an unreasonable force between them. This eliminates the seal member It is possible to extend the life span.

  Next, embodiments of the present invention will be described with reference to the drawings.

  1 is an overall side view of the backhoe, FIG. 2 is also a rear view, FIG. 3 is a plan view, and FIG. 4 is a plan view showing another embodiment of the cabin.

  FIG. 5 is a side view showing another embodiment of the door, FIG. 6 is a side view showing the other embodiment, FIG. 7 is a perspective view showing glass attachment, and FIG. 8 is a plan view showing a conventional door. .

  9 shows a side view of the door, FIG. 10 shows a first embodiment of the hinge of the folding door, (a) is a cross-sectional view taken along line AA in FIG. 9, and (b) is a cross-sectional view taken along line BB.

  FIG. 11 is a plan sectional view showing a second embodiment of the hinge, and FIG. 12 is a plan sectional view showing a third embodiment of the hinge.

  13 is a plan sectional view showing a fourth embodiment of the hinge, FIG. 14 is a sectional view showing the positional relationship with the cabin roof at the top of the door, FIG. 15 is a sectional view of the related art, and FIG. 16 is the rear glass and cabin roof. It is sectional drawing which shows these positional relationships.

  FIG. 17 is a partial perspective view showing the windshield housing state, FIG. 18 is a side view showing the windshield housing procedure, FIG. 19 is a perspective view showing the windshield housing configuration, and FIG. 20 is a perspective view showing the lock portion. It is.

  21 and 22 are sectional views showing a conventional door hinge.

  First, the overall configuration of the backhoe will be described with reference to FIGS. 1, 2, and 3. A turning frame (turning base) 2 is attached to the upper part of a crawler type traveling device 1 equipped with a pair of left and right crawlers, and the rear portion of the turning frame 2 has a circular shape in plan view. This is a so-called rear small turning type backhoe that is configured to fit within a substantial width, that is, the diameter of the turning frame is configured within the substantial width of the traveling device. Then, the earth removing plate 3 protrudes in front of the crawler type traveling device 1, an engine, a battery, and the like are arranged on the rear part of the revolving frame 2 and covered with a bonnet 14 to constitute an engine room. A fuel tank is placed on and covered with a tank cover 17. A seat seat 13 is arranged at approximately the center in the front and rear direction of the revolving frame 2, and an operating lever or the like for operating the seat seat 13, a steering operation or a working machine, and the like is covered by the cabin 8.

  A work machine mounting portion 16 is provided at the front left and right substantially center of the revolving frame 2 to mount the base of the excavation work machine 7. The excavation work machine 7 includes a bucket 4, an arm 5, a boom 6, and a cylinder that rotationally drives them, and a base of the boom 6 is supported by the work machine mounting part 16 so as to be turnable left and right. 12, the boom 6 can be rotated up and down with a boom cylinder 11 interposed between the boom 6 and the boom bracket 12. An arm cylinder 10 is interposed between the boom 6 and an arm 5 rotatably attached to the tip of the boom 6 so that the arm 5 can be rotated back and forth. A bucket cylinder 9 is interposed between the arm 5 and the bucket 4 pivotally supported at the tip of the arm 5 so that the bucket 4 can be swung and rotated.

  Next, the configuration of the cabin 8 of the present invention will be described with reference to FIGS. The revolving frame 2 has a circular shape in a plan view, and has a shape in which a portion provided with a front work mounting portion 16 is cut out. Then, the cabin 8 is placed on the revolving frame 2 so as to be accommodated in a plan view. That is, as shown in FIG. 3, the tank cover 17 is disposed so that a part (about half) of the tank cover 17 is exposed on the right side of the cabin 8 and covers the other front surface, in other words, the right side of the cabin 8 straddles the tank. The rear portion of the cabin 8 is placed on the rear portion of the engine room, that is, on the rear portion of the bonnet 14, and is formed into a curved shape along the outer peripheral shape of the swivel frame 2, and the right side surface and the front surface are planar. Some of the circles and other parts are polygonal when viewed. Further, as shown in FIG. 4, the cabin 8 can be arranged so as to cover the entire upper surface of the revolving frame 2 excluding the work implement attachment portion 16, and the portion other than the front surface can be configured in a circular shape in plan view.

  In the case of the cabin 8 shown in FIGS. 2 and 3, the exposed tank cover 17 can be opened and closed outward, so that the hydraulic oil tank, the fuel tank, etc. can be maintained from the outside. Further, the rear surface of the bonnet 14 can be opened and closed rearward for maintenance. In the case of a type that covers the entire surface of the revolving frame 2, the cabin 8 is placed on the outer periphery of the tank cover 17, and a door 15 </ b> R is provided on the right side in the traveling direction so that the tank cover 17 can be rotated and opened horizontally. It can be opened in the cabin 8. Thus, the front surface of the cabin 8, the left door 15 and the right side surface are flat, and the cabin 8 is covered with glass (window glass) except for the ceiling, a part of the side surface and the support frame so that the field of view is as wide as possible. The interior of the revolving frame 2 is covered as wide as possible to increase the indoor space, thereby improving the comfort and operability.

  In the cabin 8, a seat 13 and an operation lever are arranged on the left side in the traveling direction, and the hood 14 covers the right side from the lower rear side of the seat 13 as an engine room. The rear part of the cabin 8 is as shown in FIG. Further, the hood 14 is placed so as to protrude slightly rearward from the upper rear portion of the bonnet 14. However, it does not protrude from the revolving frame 2.

  In addition, the outer peripheral ends of the front surface, the rear surface, and the side surfaces of the cabin 8 are disposed inside the revolving frame 2. As shown in FIG. 2, the side surfaces other than the front surface are not perpendicular to the grounding surface, and the upper side is configured to be inclined at an angle θ toward the center of the body. If the inclination angle θ is too large, the indoor space is reduced and a feeling of pressure is generated, the operability is deteriorated, and if it is vertical, the upper part looks largely unstable and the appearance is poor, When working on a small site, if the ground is inclined, the upper part of the cabin 8 may hit the obstacle at a high position and damage may be caused when working while turning. Therefore, in the present invention, the inclination angle θ is set to an angle of about 1 degree to improve workability in a narrow field and to improve the appearance and to have a stable appearance. However, as shown in FIGS. 3 and 4, when the cabin 8 is configured to expose a part of the tank cover 17 or cover the entire surface on the revolving frame 2, the door 15 is shown in FIGS. 1 and 3. Thus, even if the size of the rear door 15a and the front door 15b is substantially the same, as shown in FIG. 5, even if the front door 15b is larger, as shown in FIG. You may comprise with a door.

  Next, the structure which attaches glass (window glass) 19 to the cabin frame 20 which comprises the cabin 8 is demonstrated from FIG. In addition to the door 15, the cabin frame 20 has openings 20A, 20B,... For securing a field of view and fitting glass, and glass 19A, 19B,. An attachment edge portion 20a for attaching the is formed. To explain one of them, the mounting edge 20a is provided with bosses or holes 20c, 20c,. The holes 20c, 20c,... Are attached with seals 21, 21,..., The adhesive is applied to the top and the mounting edge 20a, and the glass 19A, 19B,. It is bonded and fixed through. The seal 21 prevents the adhesive from entering the hole 20c and closing the hole 20c or filling the thread. Further, the hole 20c is threaded (tapped) or has a boss embedded therein.

  Then, if the glass breaks due to an accident such as when working or traveling, the substitute part 22 is attached to that part. The substitute part 22 is a part that is relatively easy to obtain, and is made of, for example, a transparent acrylic plate, and a hole is formed around the substitute parts 22A, 22B... According to the positions of the holes 20c, 20c. 22a, 22a ... are opened. Thus, when the substitute part 22 is attached, the seals 21, 21... Are removed except for the glass of the part, and screws or bolts are inserted into the holes 20 c and 22 a to fix the substitute part 22. When a boss is provided instead of the hole 20c, it is fixed with a pin or the like. In this way, if an alternative part made of a relatively inexpensive and lightweight synthetic resin or the like is prepared in advance, it can be repaired inexpensively and easily by attaching the alternative part instead of glass in the event of an accident. It becomes like this. In addition, even if the service center is not nearby, the replacement parts can be easily installed, so that the work can be resumed promptly. Also, there is no need to wait for the adhesive to dry or wait for genuine parts to arrive, so that the response can be made quickly.

  Next, the configuration of the door will be described. As shown in FIGS. 1 and 3, the door 15 provided in the cabin 8 is provided on the left side with the side where the excavating work machine 7 is provided as the front (traveling direction). -It is pivotally supported by 24 and is configured to be opened and closed by being folded (middle fold) when opened and closed. As shown in FIG. 8, the conventional door is configured such that the width L1 'of the rear door 15a' is smaller than the width L2 'of the front door 15b' provided with the handle 57 (L1 '<L2'). With this configuration, the arc portion on the side of the seat 13 is scraped by the front door 15b ', and the space is narrowed.

  Therefore, in the present invention, as shown in FIG. 3, by setting the widths L1 and L2 of the rear door 15a and the front door 15b to the same length (L1 = L2), the door 15 becomes a middle bend and the cabin is viewed in plan view. 8 has a polygonal shape, which increases the indoor space and the space on the side of the operator to improve operability. Then, when the door 15 is fully opened so as to follow the side surface shape, an arc-shaped depressed space in which the opened door 15 is accommodated is placed on the side surface of the rear position of the door 15 so that the door 15 is accommodated within the radius R of the revolving frame 2. 18 is formed. Thus, when the door 15 is fully opened, the door 15 can be stored in the arc-shaped space 18, and when the door 15 is turned with the door 15 open during the operation, even if an obstacle or the like is nearby, It can be turned without being damaged and without worrying about the door 15. Of course, it is located in the revolving frame 2 even when the door 15 is closed. Although not shown, a catch for fixing the door 15 in an opened state is provided on the cabin side.

  In addition, a hinge is provided between the rear door 15a and the front door 15b so that the door 15 can be opened along the side surface shape. As shown in FIG. 21, an elastic body 51 made of rubber or the like for sealing is provided on the end face of the door glass 50, 50, and the hinge 24 ′ has a hinge plate 52, 52 that is bolted to the door glass 50, 50. The hinge plates 52 and 52 are pivotally supported by a pivot shaft 54. Then, stays 55 and 55 are projected inward from the inner surfaces of the hinge plates 52 and 52, a stopper 56 is fixed to one stay 55, and the other stay 55 is used as a contact plate for the stopper 56. Further, the elastic body 51 is configured as shown in FIG. 22, and the elastic body 51 is divided into left and right, and one elastic body 51a is in contact with the other elastic body 51b so that there is no gap when opening and closing. ing.

  With this configuration, when the door 15 'is opened, the door 15' opens outward and the rear door 15a 'and front door 15b' are bent inward. However, with such a configuration, in the case of FIG. 21, since the pivot shaft 54 is not located on the extension line of the center in the thickness direction of the door glass 50, 50, every time the door 15 'is opened and closed. The elastic body 51 was repeatedly bent and stretched, and the life was shortened. In the configuration of FIG. 22, a gap is formed when the elastic body 51 deteriorates, and a gap is formed when dust or the like enters the contact portion. Further, when the door 15 ′ is fully opened, the hinge 24 ′ protrudes outwardly, and may turn accidentally and damage the door 15 ′. When the door 15 ′ is closed, the divided doors 15 a ′ and 15 b ′ are in a straight line state, which is the same as a single door and the indoor space is small.

  Therefore, in the present invention, as in the first embodiment shown in FIG. 10A, the hinge plate 25 of the hinge 24 is configured in a bowl shape in plan view, and the boss portion for inserting the pivot shaft 26 at the tip thereof. 25a is formed, and the other end is fixed to the end of the door glass 50 by bolts 53, 53. The center of the boss portion 25a is positioned on the extension of the center line O1 in the thickness direction of the door glass 50 so that the distance between the glass 50 and 50 of both doors does not change when it is bent. Further, the end portions of the door glass 50 are connected by a seal member 27 made of an elastic material such as rubber. The seal member 27 is configured to connect the outer side opposite to the hinge plate 25 while bypassing the boss portion 25a. The external appearance is as shown in FIG. As shown in FIG. 10 (b), the sealing member 27 at a position other than the hinge portion is linearly connected on the center line O1, and when the door is opened and closed and bent, there is almost no tensile force or compressive force. In fact, the life of the seal member could be extended. Then, a "U" -shaped cored bar 65 in a plan view is disposed and reinforced in the seal member 27 at a portion sandwiching the end portions of the door glass 50, 50, and is simply fitted without an adhesive during assembly. It's easy to do.

  As a second embodiment of the hinge 24, as shown in FIG. 11, the hinge plate 25 and the seal member 27 can be integrally formed. That is, the hinge plate 45 is configured in a U shape in a plan view, the boss portion 45a is provided at the outer center of the hinge plate 45 on the closing side, and these outer surfaces are covered with the seal member 47, so that the hinge plate 45 is opened. The side is inserted into the door glass 50 and fixed with bolts 53 and 53. In the case of this embodiment as well, the center of the boss portion 45a is positioned on an extension line of the center line O1 in the thickness direction of the door glass 50. However, a configuration in which an adhesive is applied between the hinge plate 45 and the door glass 50 to enhance the adhesive effect, or a configuration in which the bolts 53 are eliminated only by the adhesive can be employed. Further, instead of the hinge plate 45 and the seal member 47, a seal member with a cored bar can be used.

  Further, as in the third embodiment shown in FIG. 12, the door glass 50 is fixed to the door frame 60 through a seal member 61 with an adhesive or the like, and a hinge plate 62 is projected from the door frame 60, so that the rear door The hinge plates 62 and 62 of 15a and the front door 15b are pivotally supported by the pivot shaft 63. The hinge plate 62 is bent in a “h” shape so that the center of the pivot shaft 63 is located on the extension line of the center line O1 in the thickness direction of the door glass 50, and a boss portion 62a is formed at the tip. ing. A seal member 64 is interposed between the end portions of the door glasses 50 and 50. The seal member 64 is configured to have a portion where the door glass 50 is attached in a “U” shape in a cross-sectional view in plan view, and has a core inside. The gold 65 is built in and integrated.

  Further, as in the fourth embodiment shown in FIG. 13, a stay 60 a is protruded from the door frame 60, and the stay 60 a, the door glass 50, the hinge plate 66, and the seal member 67 are integrally fixed by bolts 69. Yes. The seal member 67 is configured to wrap the entire hinge plate 66. Further, the hinge plates 66 and 66 are pivotally supported by the pivot shaft 63, and the hinge plate 66 is disposed at the tip of the hinge plate 66 so that the center of the pivot shaft 63 is located on the extension line of the center line O1 in the thickness direction of the door glass 50. A boss portion 66a is configured.

  With this configuration, when the door 15 is opened and closed, the center of rotation of the hinge 24 that is the folding position coincides with the center of rotation of the door glass 50, so that an unreasonable force is applied to the seal member 27. In addition, the service life can be extended, and in the prior art, it was only possible to turn from about 180 degrees to one side, but it can be turned to both sides, and a large bending angle can be obtained.

  Further, the side end surface 8b of the roof 8a of the cabin 8 is provided so as to protrude outward from the outer surface of the upper end of the door glass 50, thereby preventing rainwater from entering. That is, as shown in FIG. 15, the positional relationship between the upper end of the door 15 and the cabin 8 is such that the outer end surface of the side end face 8b ′ and the upper end of the door glass 50 is substantially the same in order to improve the appearance and expand the indoor space. Configured to match. However, the seal member 29 'is disposed in the gap between the side end face 8b' and the door glass 50. However, since raindrops directly hit or accumulate on a part of the seal member, the part deteriorates quickly. At the same time, in order to open and close the door 15 with rainwater adhering thereto, the rainwater dripped into the room or flowed in.

  Therefore, as shown in FIG. 14, a projecting plate 31 is fixed to the outer side surface of the cabin frame 30, the projecting plate 31 is projected outward in the horizontal direction, and a roof is formed on the outer end of the projecting plate 31. A side end face 8b of 8a is fixed. Alternatively, the roof 8a extends horizontally inward and is fixed to the cabin frame 30. Then, the seal 17 is extended or another seal 29 is fixed around the door 15 so that the seal member 29 hits the interior side of the cabin frame 30 or the overhanging plate 31. And, it is configured to project outward by a length L3 between the outer surface of the seal member 29 (or the door glass 50) and the side end surface 8b of the cabin 8. With such a configuration, the side end face 8b looks like a ridge due to the outwardly projecting portion, rainwater does not directly hit the seal member 29, deterioration of the seal member 29 is reduced, and rainwater intrusion can be prevented. It is. Further, since the backhoe does not travel at high speed, no wind noise or the like is generated.

  In addition, as shown in FIG. 16, the side end surface 8b of the side glass 19A and the rear glass 19B of the cabin 8 is configured to protrude outward from the side glass 19A and the rear glass 19B. Yes. The seal member 23 is fixed to the cabin frame 30 and the glass with an adhesive, and a plate 71 serving as a weir is fixed to the cabin frame 30 below the seal member 23 so that the seal member 23 can be easily attached. And prevents the adhesive from dripping.

  The windshield is divided into an upper glass and a lower glass 35. The upper glass can be stored upward, and the lower glass 35 is detachable. When performing or when it is difficult to see the lower front working position, the windshield is removed to improve ventilation and improve visibility. If the removed lower glass 35 is stood in the cabin 8, the lower glass 35 may fall over or kick when it is moved, so that the storage space is formed below the mounting portion of the lower glass 35. Thus, the lower glass 35 is accommodated and can be fixed by a belt-like member 36 made of an elastic body such as a rubber belt.

  That is, as shown in FIGS. 17 and 18, the front cover 37 of the cabin for supporting and attaching the lower piece of the lower glass 35 is formed in a concave shape that can accommodate the lower glass 35. A cushioning material 39 such as rubber is disposed on the inner surface side with an appropriate interval so that the lower glass 35 does not directly hit the front cover 37 during storage. Then, both ends of the band-shaped member 36 wider than the lower glass 35 are fixed to both sides inside the front cover 37.

  In such a configuration, the lower glass 35 is removed, and as shown in FIGS. 18 (a) and 18 (b), a space is formed by pulling the belt-like member 36, and the lower glass 35 is removed to remove the lower glass 35. If it is lowered to the front and lower side in the state, it is stored in the belt-like member 36. After the storage, the lower glass 35 is moved to the front cover 37 side by the elastic force of the belt-like member 36 itself as shown in FIGS. Then, it is pressed against the cushioning material 39 and fixed.

  As another configuration for storing and fixing the lower glass 35, as shown in FIGS. 19 and 20, the lower glass 35 is inserted into the left and right guide bodies 40, 40 configured in a rail shape, and the guide body 40 is inserted. It can also be configured to be fixed to the front cover 37. In other words, the guide body 40 is formed in a U-shaped rail shape in plan view, and the left and right guide bodies 40 and 40 are connected by the connecting shaft 46 at a position matching the width of the lower glass 35, and the step or front cover 37 is connected. The locking member 41 is arranged on the upper portion of the guide body 40 so that the locking member 41 is provided on a locking portion provided on the front cover 37. It is locked and locked. As an example of this lock configuration, a cylindrical body 42 is fixed to the upper part of the guide body 40 in the front-rear and horizontal directions, a lock lever 43 is inserted into the cylindrical body 42, and a hook portion 43a is provided at the tip of the lock lever 43, A locking body 44 is provided on the front cover 37 on the side of the hook portion 43a, and the lock lever 43 is rotated so that the hook portion 43a is engaged with the locking body 44 and can be locked. However, the locking body 44 can also be an engagement hole, and the lock lever 43 can also be configured to be biased by a spring and maintained in the yak position.

  That is, in the cabin of the rear small swivel type backhoe in which the revolving frame excluding the work implement attachment portion is configured in a substantially circular shape and the diameter is configured to be substantially within the width of the crawler type traveling device 1, The side surface of the cabin 8 is formed in a curved shape along the outer peripheral shape of the radius R of the swivel frame 2 as viewed, and the side surface of at least one side of the cabin 8 is formed in a polygonal shape. The face is divided into front and rear parts and pivotally supported by a hinge 24, and is formed as a half-folded door 15 that can be folded and opened at the time of opening and closing. The middle-folded door 15 is formed of a rear door 15a and a front door. 15b, the width L1 of the rear door 15a and the width L2 of the front door 15b are the same length (L1 = L2), and when the half-folded door 15 is fully opened, the revolving frame 2 Within radius R An arcuate hollow space 18 is formed on the side surface of the cabin 8 at the rear position of the door 15 to accommodate the folded door 15 in a state of being pivoted and opened backward. Since the arc-shaped recessed space 18 is formed below the roof 8a of the cabin 8, the indoor space can be made larger than before, the comfort can be improved, and the space can be afforded even when the lever is operated. Was also improved. And the safety at the time of work could be improved, and by extension, it became possible to meet overseas cabin standards.

  In addition, since the entire surface of the swivel frame except the work machine mounting portion is covered with a cabin, the indoor space can be increased without disturbing excavation work, and there is no feeling of pressure even with a small backhoe. It was possible to maneuver and improve comfortability.

  In addition, since the work machine mounting part of the revolving frame and almost the entire surface excluding the tank cover part on at least one side surface are covered with the cabin, the tank cover can be opened from the outside while maintaining the indoor space. As a result, maneuverability and workability were improved.

  Also, a fuel tank is arranged on one side of the revolving frame, a cabin is placed across the fuel tank, and the side surface of the fuel tank constitutes a part of the side surface of the cabin. The cabin can be omitted only in the fuel tank, and the cabin space can be increased, but the material cost can be reduced and the comfortability can be improved without deteriorating the maintainability.

  Further, since the rear part of the cabin is positioned on the outer peripheral end of the rear part of the engine room, the bonnet covering the cabin and the engine room is substantially in a straight line, the unevenness is small, and the appearance can be improved. In addition, the cabin is located inside the revolving frame and does not come into contact with other obstacles during revolving.

  In addition, since the cabin side wall is inclined inward, the appearance of the head is not stable and the appearance is stable, and the obstacle does not come into contact with other obstacles when turning.

  In addition, the outer edge of the roof of the cabin extends beyond the outside surface of the window glass, so raindrops do not directly hit the glass seal member, and the life of the seal member can be extended. Thus, it was possible to prevent the intrusion of rainwater in the long term.

  Further, the cabin side surface configured in the polygonal shape has two adjacent surfaces as a folding door, and the lengths of the doors on the two surfaces are substantially the same size. In addition, the space around the control lever has been widened, and the maneuverability has also been improved.

It is the whole backhoe side view. Similarly it is a rear view. It is also a plan view. It is a top view which shows the other Example of a cabin. It is a side view which shows the other Example of a door. It is a side view which similarly shows other Examples. It is a perspective view which shows attachment of glass. It is a top view which shows the conventional door. It is a side view of a door. The 1st Example of the hinge of a folding door is shown, (a) is AA sectional drawing in FIG. 9, (b) is BB sectional drawing. It is a plane sectional view showing the 2nd example of a hinge. It is plane sectional drawing which shows the 3rd Example of a hinge. It is a plane sectional view showing the 4th example of a hinge. It is sectional drawing which shows the positional relationship with the cabin roof of a door upper part. Similarly, it is a conventional sectional view. It is sectional drawing which shows the positional relationship of rear glass and a cabin roof. It is a partial perspective view which shows the accommodation state of a windshield. It is a side view which shows the accommodation procedure of a windshield. It is a perspective view which shows a windshield accommodation structure. It is a perspective view which similarly shows a lock part. It is sectional drawing which shows the conventional door hinge. It is sectional drawing which shows the conventional door hinge.

DESCRIPTION OF SYMBOLS 1 Crawler type traveling apparatus 2 Revolving frame 7 Excavation work machine 8 Cabin 8a Roof 8b Side part end surface 15 Door 16 Work machine attachment part 17 Tank cover 19 Glass 24 Hinge 36 Band-shaped member

Claims (1)

In a backhoe cabin constructed by splitting the door (15) into a rear door (15a) and a front door (15b) and pivoting both with a hinge (24), the pivot of the hinge (24) The center of the shaft (26) is positioned on the extension of the center line (O1) in the thickness direction of both door glasses (50, 50) constituting the rear door (15a) and the front door (15b), and the both door glasses The end portions of (50, 50) are connected to each other by a seal member (27), and the seal member (27) bypasses the pivot shaft (26) of the hinge (24). A characteristic backhoe cabin.

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