JP2000096623A - Door structure of slewing working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost of the door part of a cabin by making it possible to secure a wide interior even if the door of a cabin mounted on a slewing working machine is formed of a substantially planar material. SOLUTION: In a slewing working machine, a slewing frame 8 is provided on a travel device in such a way as to freely turn about a vertical axis and a cabin 12 is mounted on the slewing frame 8. A door 32 is pivoted to a door frame provided on the side face of the cabin 12, in such a way that the door 32 freely oscillates about a longitudinal axis. The door 32 comprises a plurality of door panels 34, 35 connected together in such a way as to freely oscillate about the longitudinal axis. The pivoting point P of the door panels 34, 35 is placed outside of a line L1 connecting the front and rear columns 25, 26 of the door frame and inside of the track of revolution L2 of the slewing frame 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door structure of a turning machine such as a backhoe.

[0002]

2. Description of the Related Art For example, in the case of a small turning work machine in which the rear side surface of the revolving unit does not protrude from the vehicle width of the traveling device, it is necessary to fit the rear part of the revolving unit into a circle having the vehicle width in diameter. The cabin mounted on the frame must also have a compact structure suitable for the rear side of the revolving superstructure.

[0003] Therefore, in the conventional small-swing turning machine,
A cabin having a rounded side surface curved in the front-rear direction is mounted on a revolving frame provided rotatably about a vertical axis on a traveling device. In addition, in order to secure the interior space of the cabin as large as possible, a door that is curved in the same way as the side shape of the cabin is provided on the slide rail provided on the cabin in the front-rear direction at the opening formed at the front of the cabin. It is provided so as to be slidable (for example, Japanese Utility Model Laid-Open No. 6-12556,
No. 91538).

[0004]

However, in the above-mentioned conventional turning working machine, since the door is slidably provided on the slide rail on the cabin side, the door must be manufactured as a curved and integrally formed member. However, there is a problem that the manufacturing cost of the door increases. The present invention has been made in view of the above-described circumstances, and enables a cabin door to be mounted on a turning work machine to be made of a substantially planar material so that a wide room can be secured. The primary purpose is to reduce

On the other hand, in the means for slidably providing the door on the slide rail on the cabin side, the slide of the door is easily hindered by soil and the like adhered to the slide rail during the operation, so that the door does not rattle or cannot be opened early. There are drawbacks. Therefore, a single door is pivotally attached to the rear edge of the opening of the door frame so as to be rotatable around the vertical axis.
The use of a pivot type door has already been performed.

However, when a single door panel is pivotally attached to the rear edge of the opening of the door frame, the door is easily deformed out of the plane by an external force acting on the outer surface and the handle of the door. It is necessary to form the door with a thick plate material, and in this respect, there is a problem that the manufacturing cost of the door is increased. A second object of the present invention is to reduce the manufacturing cost of the cabin door by minimizing the out-of-plane deformation even if the cabin door mounted on the turning work machine is formed relatively thin. And

[0007]

In order to achieve the first object, the present invention employs the following technical means. That is, the first aspect of the present invention is that a turning frame is provided on a traveling device so as to be rotatable about a vertical axis, a cabin is mounted on the turning frame, and a door frame is provided on a door frame provided on a side surface of the cabin. Is pivotally mounted about a vertical axis, the door comprises a plurality of door panels connected to be swingable about the vertical axis, and the pivot point of these door panels is It is arranged so that it may be located outside the straight line connecting the front and rear struts of the door frame and inside the turning trajectory of the turning frame.

In this case, since the door is divided into a plurality of door panels that are swingably connected to each other about a vertical axis, even if each door panel is made of a substantially flat material, the door is curved. It is possible to appropriately conform to the side shape of the cabin. Also, since the pivot point of each door panel is outside the straight line connecting the front and rear struts of the door frame,
When the door is closed, the living space in the cabin is not unnecessarily narrowed, and the pivot point is inside the turning locus of the turning frame. It does not grow unnecessarily.

In the first aspect of the present invention, if the pivot axis of the pivot member for pivotally coupling the plurality of door panels to each other is located outside the door panel, the door panels are opened when the door is opened. Can be bent toward the outdoor side. And, if the seal member is interposed between the edges of the plurality of door panels after adopting the above-mentioned pivoting structure, when the door is closed along the curved side surface shape of the cabin, between the door panels, Watertightness can be effectively secured.

In order to achieve the second object, the present invention takes the following technical measures. That is, a second invention provides a traveling device in which a revolving frame is provided rotatably around a vertical axis, a cabin is mounted on the revolving frame, and a door frame is provided on a door frame provided on a side surface of the cabin. Is pivotally mounted around a vertical axis, the door comprises a plurality of door panels connected to be swingable about a vertical axis, and a handle for opening and closing the door is provided. And a first pivot member for pivoting the door to the door frame and a second pivot member for pivoting the door panels together.

In this case, since the door is divided into a plurality of door panels pivotally mounted around the vertical axis, an external force acting on the outer surface of the door will be described in detail in FIG. Is smaller than that of a single door, so that out-of-plane deformation due to external force can be suppressed as compared with the case of a single door.

Also, since the handle is arranged at substantially the same level as the first and second pivot members, it is effective that the door panel is vertically twisted by an external force acting on the handle when the door is opened and closed. This prevents the door from deforming out of plane. In the above second invention, if a reinforcing plate extending from the first pivot member to the handle via the second pivot member is extended on the back side of the door, out-of-plane deformation when opening and closing the door is more effective. Can be suppressed.

[0013] In the second aspect of the present invention, when the shape retaining means for defining the bending angle between the door panels at the time of opening is provided, the torsional deformation of the door panel due to the reaction force from the shape retaining means is effectively prevented. In order to suppress, it is preferable that the shape retaining means is also arranged at substantially the same level as the first and second pivot members. Furthermore, in the case where a lock mechanism for fully opening the door panel constituting the free end of the door to be detachably engaged with the outer surface of the cabin is provided, the torsional deformation of the door panel due to the reaction force from the lock mechanism is effectively prevented. In order to suppress this, it is preferable that this lock mechanism is also arranged at substantially the same level as the first and second pivot members.

In the case where the shape retaining means is provided, if the mounting bracket of the shape retaining means is fixed to the door panel together with the pivoting member or the engaging member which engages with the lock mechanism for fully opening, The number of attached members is reduced, which leads to a reduction in door manufacturing costs.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 5 show a first embodiment of the present invention. FIG. 3 shows a small turning backhoe 1 exemplified as a turning work machine adopting the present invention. The backhoe 1 is mainly composed of a traveling device 2, a revolving unit 3 and an excavating device 4.

Hereinafter, the traveling direction of the backhoe 1 (the left-right direction in FIG. 3) is referred to as the front-rear direction, and the lateral direction perpendicular to the front-rear direction (the direction penetrating the paper surface in FIG. 3) is referred to as the left-right direction.
As shown in FIG. 3, the traveling device 2 employs a crawler traveling device in which a pair of left and right crawler traveling members 5 having rubber crawler belts are provided, and these traveling members 5 are driven by a traveling motor M. . A dozer 6 is provided at the front of the traveling device 2.
Is provided.

The revolving unit 3 is a bearing (slewing bearing) 7 provided at a central portion between the left and right crawler traveling units 5 of the traveling device 2.
Frame 8, which is rotatably supported about a vertical rotation center X, a hood 9 that covers various devices mounted on the rotation frame 8, a seat 10 provided on the hood 9, And a cabin 12 that covers a control section (not shown).

The revolving frame 8 has an outer periphery of a base plate 13 on which mounting brackets for various devices are erected on the upper surface.
A counter weight 15 fixed to the base plate 13 and balancing the weight with the excavator 4 at the front of the revolving frame 8 is provided at the rear of the revolving frame 8. Have been.
The turning frame 8 is turned around a turning center X by a turning motor (not shown) provided on the base plate 13.

The backhoe 1 is of a so-called small backward swing type, and is formed in an arc shape so that the rear side surface of the swing body 3 does not protrude from the vehicle width of the traveling device 2. That is, when the revolving unit 3 turns, the turning trajectory drawn by the rear surface of the revolving unit 3 falls within the left and right widths of the left and right crawler traveling units 5. As shown in FIG. 3, a pair of upper and lower pivotal support members 16 that support the excavator 4 protrude from the front right side of the turning frame 8. A swing bracket 17 is pivotally mounted on the pivot member 16 via a support shaft so as to be swingable left and right around the vertical axis. The swing bracket 17 is swung by a swing cylinder (not shown) provided in the turning frame 8. Be moved.

The excavator 4 has a boom 18 whose base is pivotally attached to a swing bracket 16 so as to be swingable about the left and right axes.
And an arm 19 pivotally attached to the distal end side of the boom 18 so as to be swingable about the left and right axes, and a bucket 20 attached to the distal end side of the arm 19 so as to be free to squeeze and dump. The boom 18 is swung by a boom cylinder 21 provided between the swing bracket 17 and the middle part of the boom 18, and the arm 19 is provided with an arm cylinder 22 provided between the middle part of the boom 18 and the base of the arm 19. The bucket 20 is squeezed and dumped by the bucket cylinder 23 provided between the base of the arm 19 and the mounting link of the bucket 20.

As shown in FIGS. 1 and 2, the cabin 12 is provided with a cabin frame including front and rear columns 25 and 26, an intermediate column 27, and an upper frame (not shown) connecting these upper ends to each other. A top plate 28 (see FIG. 3) is fixed to an upper end frame of the cabin frame. The front support 25 is erected at the front end of the turning frame 8, the intermediate support 27 is erected at the center of the frame 8 in the front-rear direction, and the rear support 26 is erected on the upper surface of the hood 9. A windshield 29 is mounted between the left and right front supports 25, and a rear glass (not shown) is provided between the left and right rear supports 26.
Is installed.

The left side surface of the cabin 12 is formed substantially along the left side shape of the revolving frame 8.
Therefore, the rear portion of the left side surface of the cabin 12 is formed in a curved shape inclined toward the center toward the rear. Also,
A rear side glass 30 (see FIG. 3) is fitted in the rear upper portion of the left side surface of the cabin 12. A door frame 31 is provided at the front of the left side of the cabin 12 to form an opening for an operator to ride on. The door 32 is pivotally connected to the door frame 31 so as to be openable and closable. The door frame 31 is formed in a square frame shape from a front support 25, an intermediate support 27, an upper end frame, and a lower end frame connecting between the front support 25 and the lower end of the intermediate support 27. A rubber sealing member 33 for sealing is provided all around the inner edge of the frame.

In the present embodiment, the door 32 is divided into two parts from the flat first and second door panels 34 and 35 to be described later. The door 32 is formed so as to be bent in a substantially U-shape in plan view with the divided portion of the door 32 as a boundary. In the present embodiment, the door 32 is of a split type that is divided into two front and rear portions, and the base end is pivotally attached to the rear end of the door frame 31 of the cabin 12 around the vertical axis. The first door panel 34 includes a door panel 34 and a second door panel 35 whose base end is pivotally connected to a distal end of the first door panel 34 around a vertical axis.

That is, the first door panel 34 has a pair of upper and lower hinges (first pivot members) at the base end thereof on the intermediate support 27.
The second door panel 35 is rotatably attached via a pair of upper and lower hinges (second pivot members) 37 at its base end to the distal end of the first door panel 34. Have been. The first and second door panels 3
Side glasses 38 (see FIG. 3) are fitted into the upper portions of 4, 35, respectively.

At the front end of the second door panel 35, there is provided a first lock mechanism 39 for fully closing the front end 25 detachably engaging the front end 25 constituting the front edge of the door frame 31 of the cabin 12. The front support 25 is provided with an engaging member (not shown) with which the hook portion of the first lock mechanism 39 is removably engaged. On the other hand, at the rear of the left side of the cabin 12, there is provided a second lock mechanism 40 for fully opening for detachably engaging the opened door 32 with the rear of the left side of the cabin 12. The second lock mechanism 40 has a function of automatically catching the gate-shaped engaging member 41 provided at the center of the outer side surface of the second door panel 35, and operates to push the door 32 in the opening direction. Thereby, the engagement member 41 has a function of automatically opening.

The first and second door panels 34, 35
A handrail member 42, which is formed in a substantially U-shaped frame shape in plan view, protrudes from the inner side surface of each of them. The door 32
Further comprises shape retaining means 43 for retaining the door 32 opened from the first lock mechanism 39 in a warped shape along the rear portion of the left side of the cabin 12. In the present embodiment, the shape retaining means 43 is provided. As the first and second door panels 34, 3
A gas damper installed between the five is used.

That is, in the gas damper 43, the base end of the air cylinder 44 is pivotally connected to a first bracket 45 provided on the inner surface side of the first door panel 34, and the distal end of a cylinder rod 46 which protrudes and retracts from the air cylinder 44. Is pivotally attached to a second bracket 47 provided on the inner side surface of the second door panel 35, so that the first and second door panels 34, 35
The gas damper 43 is erected between the cabin 12 and the gas damper 43 so as to always urge the second door panel 35 to the outside of the cabin 12 so that the second door panel 35 is bent outside the extension of the first door panel 34. .

Therefore, when the lock of the first lock mechanism 39 of the door 32 at the fully closed position A is released, the door 32 is opened and the second door panel 35 is in a state where it does not receive external force from the cabin 12 side. In this state, when the gas damper 43 is in the most extended state, the door 32 is kept in a warped shape. As shown in FIG. 1, a third lock mechanism 48 that holds only the first door panel 34 in a closed state is provided at a lower end frame (or an upper end frame) of the door frame 31 of the cabin 12. When the third lock mechanism 48 is locked, the tip of the first door panel 34 can be locked to the door frame 31, and when the lock is released, the tip of the first door panel 34 can be released from the door frame 31.

The third lock mechanism 48 is unlocked at all times, and locks from the indoor side of the cabin 12 only when the door 32 is ventilated and opened as shown by the phantom line in FIG. It is. As shown in FIG. 1 and FIG. 2, the engaging member 41
In front of the first door panel 3 of the fully opened door 32
A stopper 49 is provided protruding from the outer surface of the door 4 to prevent the door 32 from rattling.

The first and second door panels 34, 35
Are fixed to their outer surfaces such that their pivot shafts are located outside the door panels 34, 35, whereby the shape retaining means 43 is secured. Thereby, the second door panel 35 can be bent in a curved manner toward the outdoor side of the cabin 12 as described above.

Then, the first and second door panels 34, 3
In the case where the door 32 is closed along the curved side surface shape of the cabin 12 (solid line state in FIG. 1), a sealing member 50 is interposed between the edges of the cabin 12. Water tightness between the door panels 34 and 35 is ensured. In the present embodiment, as shown in FIG. 4, the pivot point P (the pivot axis of the hinge 37) of the first and second door panels 34 and 35 constitutes the front and rear columns of the door frame 31. Front support 25 and middle support 2
7 are arranged outside the straight line L1 and further inside the turning trajectory L2 formed by the rear side surface of the turning frame 8.

In FIG. 4, the straight line L1 is set as a straight line connecting the contact portions of the front support 25 and the intermediate support 27 with the seal member 33. Next, the above cabin 1
The operation of the second door structure will be described. First, as shown by the solid line in FIG. 1, when the door 32 is in the fully closed position A,
The second door panel 35 is bent indoors (to the right in FIG. 1) with respect to the first door panel 34 against the urging force of the gas damper 43, and in this state, the second door panel 35 contacts the seal member 33 around the door frame 31. ing.

In this case, the tip of the second door panel 35 is pressed against the sealing member 49A provided on the front edge of the door frame 31 of the cabin 12 by the urging force of the gas damper 43, so that the sealing performance when the door 32 is fully closed is improved. Can be done. In the present embodiment, the door 32 is divided by the first and second door panels 34 and 35 that are swingably connected to each other about the vertical axis. As shown in FIG. Even when the door 35 is made of a substantially flat material, the door 32 at the fully closed position A can be appropriately adapted to the curved side surface of the cabin 12, and the door 32 is formed of a single door panel. The manufacturing cost can be reduced as compared with the case of performing the above.

Further, as shown in FIG.
Since the pivot points P of 4, 35 are outside the straight line L1 connecting the constituent columns of the door frame 31, the living space in the cabin 12 is not unnecessarily reduced when the door 32 is closed, and Since the pivot point P is located inside the turning trajectory L2 of the turning frame 8, it is possible to effectively prevent the turning range of the turning work machine 1 from becoming unnecessarily large due to the closing door.

Further, when the door 32 is divided into front and rear parts by first and second door panels 34 and 35 which are pivotally mounted around the vertical axis, as shown in FIG. The bending moment due to the external force F acting is smaller than in the case of a single-piece door. Therefore, there is an advantage that the out-of-plane deformation due to the external force can be suppressed as compared with the case of a single-piece door. is there.

That is, as shown in FIG. 5A, when an external force F acts on a single door 32, the distance from the intermediate support 27 to the point of application of the external force F is multiplied by the external force F. A bending moment M1 is generated at the point of action.
As shown in (b), the external force F is applied to the divided door 32.
Acts, a bending moment M2 equal to the distance from the pivot point P to the point of application of the external force F multiplied by the external force F is generated at the point of application, and the bending moment M2 is smaller than the bending moment M1.

Therefore, in the present embodiment in which the door 32 is divided into front and rear portions, out-of-plane deformation of the door 32 due to the external force F can be further reduced. When the first lock mechanism 39 is released at the fully closed position A shown in FIG. 1, the door 32 is maintained in a warped shape by the gas damper 43 and then reaches the opening intermediate position B as shown by a virtual line in FIG. 2. become. Thereafter, when the door 32 is further opened until it reaches the rear side of the cabin 12, the second door panel 3 is opened.
5 is automatically caught by the second lock mechanism 40, and the door 32 is held at the fully open position C as shown by a solid line in FIG.

In this case, since the door 32 is engaged with the second lock mechanism 40 in a state where the door 32 is bent in a warped shape at the pivotal joint between the first door panel 34 and the second door panel 35, the door 32 is moved to the cabin. 12 can be fully opened in a state where it is properly aligned with the rear portion of the side surface. In addition, since the door 32 is preliminarily warped at the opening intermediate position B by the gas damper 43, the door 32 can be engaged with the second lock mechanism 40 simply by opening the door 32 as it is, and the door 32 can be engaged.
Can be locked at the fully open position C even if the shutter is released casually.

When the door 32 at the fully open position C is closed, the second lock mechanism 40 is released and the door 32 is turned in the closing direction, and the second door panel 35 is pressed against the urging force of the gas damper 43. May be pressed against the door frame 31 to engage the first lock mechanism 39 of the second door panel 35 with the engaging member of the front support 25. On the other hand, the third lock mechanism 48
When the first lock mechanism 39 is released in a state where is locked,
As shown by the imaginary line in FIG. 1, the urging force of the gas damper 43 causes the first door panel 34 to be in a closed position and only the second door panel 35 to be in a ventilated position D in which the door panel is half-opened in a warped shape. Ventilation from is possible.

The present invention is not limited to the above embodiment. For example, the shape retaining means 43 may be a hinge with a spring in addition to the gas damper.
Further, the door 32 can be divided into three or more door panels. Further, in the present embodiment, the case where the present invention is applied to the backhoe 1 that makes a small backward turning is illustrated. However, the present invention provides an ultra-small It can also be used for the turning backhoe 1.

FIGS. 6 and 7 show a second embodiment of the present invention. In the following, the configuration different from that of the first embodiment will be described with emphasis, and members common to the first embodiment will be assigned the same reference numerals and detailed description thereof will be omitted. As shown in FIG. 7, each of the door panels 34 and 35 of the present embodiment is configured by fitting a door glass 52 into a panel frame 51 that is slightly smaller than the door frame 31, and the frame of the panel frame 51 is formed. Almost the entire interior is made of glass, so that as much external light as possible is taken into the cabin 12.

In this embodiment, as shown in FIG. 6, a handle 53 for opening and closing the door 32 is provided on the door 3.
First pivoting member 3 for pivoting the second 2 to the door frame 31
6 and a second pivot member 37 for pivoting the door panels 34, 35 to one another.
Therefore, it is possible to effectively prevent the door panels 34 and 35 from being twisted vertically by the external force acting on the handle 53 when the door 32 is opened and closed.

As shown in FIG. 7, a masking sheet 54 made of plastic or a thin steel plate is adhered to the front side of the door glass 52 and to the outer peripheral edge and the upper and lower central portions thereof. In addition, a portion corresponding to the masking sheet 54 has the first lock mechanism 3
9 and the first and second brackets 4
A reinforcing plate 55 is provided for attaching the pivot members 5 and 47 and the pivot members 36 and 37.

Of these, the reinforcing plate 5 of the first door panel 34
5 includes a first central portion 56 extending in the front-rear direction from the lower first pivot member 36 to the lower second pivot member 37, and the reinforcing plate 55 of the second door panel 35 A second central portion 57 extending from the second pivot member 37 on the side to the handle 53 is provided, and the handle 53 and the gas damper 43 are intensively arranged in a vertical range within the width of these central portions 56, 57. Have been.

That is, the gas damper 4 as a shape keeping means
3 is arranged at substantially the same level as the lower first and second pivot members 36 and 37 by fixing the first and second brackets 45 and 47 to the central portions 56 and 57, and a lock for full opening. The mechanism 40 also includes the lower first and second pivot members 3.
6 and 37, so that the torsional deformation of each of the door panels 34 and 35 due to the reaction force received from the gas damper 43 and the lock mechanism 40 is more reliably suppressed.

Further, since the gas damper 43 is disposed behind the central portion 56, 57 of the reinforcing plate 55 so as to be hidden from the outside, the gas damper 43 can be seen from the outside so that the cabin 12 can be seen.
This effectively prevents the design from being hindered. FIG.
Shows a third embodiment of the present invention. In this embodiment, the panel frame 51 is omitted, and the first and second door panels 34 and 35 are substantially composed of only the glass panel 58. For this reason, in this embodiment, the sealing member 60 made of a rubber weather strip or the like is directly fixed to the outer peripheral edge of the glass panel 58 constituting each of the door panels 34 and 35.

As shown in FIG. 8, of the mounting brackets 45 and 47 of the gas damper 43, the first bracket 45 is
The glass panel 58 is bolted to the position corresponding to the hinge piece 59 of the second pivoting member 37 from both sides, and the second bracket 45 corresponds to the engaging member 41 that engages with the lock mechanism 40 for full opening. The glass panel 58 is fastened by bolts so as to sandwich the glass panel 58 from the front and back.

As described above, in this embodiment, since the mounting brackets 45 and 47 of the gas damper 43 are mounted at the same positions as the hinge pieces 59 and the engaging members 41, the door panel 3
The number of attachments of each member to 4, 35 can be reduced, and the manufacturing cost of the door 32 can be reduced. In addition,
Also in the third embodiment, the gas damper 43 as the shape-retaining means and the lock mechanism 40 for full opening are arranged at substantially the same level as the lower first and second pivot members 36 and 37. The points are the same as those in the second embodiment.

[0049]

As described above, according to the present invention,
Even if the door of the cabin mounted on the turning work machine is formed of a substantially planar material, a wide room can be ensured, so that the manufacturing cost of the cabin door can be reduced. Further, according to the present invention, the out-of-plane deformation of the cabin door mounted on the turning work machine can be suppressed as much as possible even when the door is formed relatively thin, so that the manufacturing cost of the cabin door can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan sectional view of a left portion of a cabin when a door is in a fully closed state in a first embodiment.

FIG. 2 is a plan sectional view of a left portion of the cabin when the door is in a fully opened state in the first embodiment.

FIG. 3 is a left side view showing the entire small turning backhoe according to the first embodiment.

FIG. 4 is a plan sectional view of a left portion of the cabin for indicating a position of a pivot point between door panels.

5A is a diagram showing a bending moment acting on a single door, and FIG. 5B is a diagram showing a bending moment acting on a split type door.

FIG. 6 is a left side view showing the entire small turning backhoe according to the second embodiment.

FIG. 7 is a plan sectional view of a door in a fully closed state in the second embodiment.

FIG. 8 is a plan sectional view of a door in a fully closed state in the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small turning backhoe (turning work machine) 2 Traveling device 8 Turning frame 12 Cabin 25 Front support 27 Intermediate support 31 Door frame 32 Door 34 First door panel 35 Second door panel 36 First pivot member (hinge) 37 Second pivot Member (hinge) 40 Lock mechanism for full opening 41 Engagement member 43 Shape retaining means (gas damper) 45 First bracket 47 Second bracket 50 Seal member 53 Handle 55 Reinforcement plate P Pivot point L1 Straight line connecting between columns L2 Turning locus

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hitoshi Nasu 64 Ishizukita-cho, Sakai-shi, Osaka F-term in Kubota Sakai Works (reference) 2D015 EA03

Claims (8)

[Claims] 1. A revolving frame (8) on a traveling device (2).
Is provided so as to be rotatable about a vertical axis, a cabin (12) is mounted on the revolving frame (8), and a door (32) is mounted on a door frame (31) provided on a side surface of the cabin (12). The door (32) is composed of a plurality of door panels (34, 35) that are swingably connected around the vertical axis. The pivot point (P) of the door panel (34, 35) is outside the straight line (L1) connecting the front and rear columns (25, 27) of the door frame (31) and the turning locus of the turning frame (8). (L2) The door structure of a turning work machine, wherein the door structure is arranged so as to be located inside of the door. 2. A door member (37) for pivotally connecting a plurality of door panels (34, 35) to each other, such that a pivot axis of the pivot member (37) is disposed outside the door panels (34, 35). Item 2. The door structure of a turning work machine according to item 1. 3. The door structure of a turning work machine according to claim 2, wherein a seal member (50) is interposed between the edges of the plurality of door panels (34, 35). 4. A revolving frame (8) on a traveling device (2).
Is provided so as to be rotatable about a vertical axis, a cabin (12) is mounted on the revolving frame (8), and a door (32) is mounted on a door frame (31) provided on a side surface of the cabin (12). Wherein the door (32) comprises a plurality of door panels (34, 35) that are swingably connected about a vertical axis. A handle (53) for opening and closing the door (32) includes a first pivoting member (36) for pivoting the door (32) to the door frame (31) and the door panels (34, 3).
5) The door structure of a turning work machine, wherein the door structure is arranged at substantially the same level as a second pivoting member (37) for pivoting each other. 5. A handle (53) on the back side of the door (32) from the first pivot member (36) via the second pivot member (37).
The door structure of a turning work machine according to claim 4, wherein a reinforcing plate (55) is provided extending to the turning work machine. 6. Each door panel (34, 3) when opened.
5) There is provided a shape retaining means (43) for defining a bending angle between the first and second pivot members (3).
6. An arrangement according to claim 4, wherein the arrangement is substantially at the same level as (6, 37).
Or the door structure of the turning work machine according to 5. 7. A full-open lock mechanism (40) for detachably engaging a door panel (37) constituting a free end of the door (32) with an outer surface of the cabin (12) is provided.
The lock mechanism (40) also has the first and second pivot members (3
6. An arrangement according to claim 4, wherein the arrangement is substantially at the same level as (6, 37).
7. The door structure of a turning work machine according to any one of claims 6 to 6. 8. A mounting bracket (4) for a shape retaining means (43).
5. The door panel (34, 35) according to any one of claims 4 to 7, wherein the engaging member (41) engages with the pivoting member (37) or the locking mechanism (40) for full opening. 2. The door structure of a turning work machine according to claim 1.