JP2009024414A - Hinge structure and cab for construction machine provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hinge structure capable of clearing a transport regulation by eliminating the portion of a cab projecting outward while securing a sufficient opening/closing angle even when fitted to the cab of a construction machine and also provide a cab for a construction machine having the hinge structure. <P>SOLUTION: A hinge 22 comprises two rotating shafts 22b, 22c so secured to an entrance door 20 and the side wall part 10a of the cab 10 as to be enclosed therein, respectively, and an intermediate blade 22a rotatably connected to the rotating shafts 22b, 22c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a hinge structure for opening and closing a passenger door attached to a cab of a construction machine such as a hydraulic excavator and a cab for a construction machine provided with the hinge.

2. Description of the Related Art In recent years, a construction machine such as a hydraulic excavator, a wheel loader, or a bulldozer is equipped with a cab to which an entry / exit door for an operator to get on / off is mounted.
For example, Patent Document 1 discloses a cab for a construction machine in which the degree of freedom in layout design is increased by connecting a check cover for checking an outside air filter or the like of an air conditioner and a door for getting on and off using a common hinge. It is disclosed.
JP 2006-57245 A (published March 2, 2006)

However, the conventional cab for construction machines has the following problems.
That is, in the construction machine cab disclosed in the above publication, the rotating shaft part included in the hinge is attached so as to protrude to the outside. There is a risk of the hinge protruding from the width and hooking the hinge, or being subject to transportation restrictions. In this case, it is necessary to take measures such as making a design change to reduce the size of the cab, or removing the door together with the hinges for transportation.

In particular, in the case of a construction machine such as a hydraulic excavator, a wheel loader, or a bulldozer, there is a case where the operator performs an operation with the door opened about 180 degrees. Therefore, when a biaxial hinge including two rotating shafts is employed in order to secure an opening / closing angle of 180 degrees, the amount of protrusion to the outside of the cab may be further increased.
The problem of the present invention is that, for example, even when attached to a cab of a construction machine, it is possible to clear a problem such as transportation regulation by eliminating a portion protruding to the outside of the cab while ensuring a sufficient opening / closing angle. The object is to provide a hinge structure and a cab for a construction machine having the same.

  A hinge structure according to a first aspect of the present invention is a hinge structure that is attached so as to connect a door and a wall and includes two rotating shafts that open and close the door, the first and second rotating shafts, an intermediate blade member, It is equipped with. The first rotating shaft is disposed so as to be included on the door side. The 2nd rotating shaft is arrange | positioned so that it may be enclosed by the wall side. The intermediate blade member connects the first rotating shaft and the second rotating shaft to each other.

Here, the first and second rotating shafts attached so as to be included in the door and the wall are directly connected by the intermediate blade member.
Here, the first and second rotating shafts are rotating shafts attached so as to be embedded in the door and the wall side. By adopting such a biaxial hinge structure, the intermediate blade member can be rotated 90 degrees with respect to the first and second rotational axes to open the door 180 degrees with respect to the wall. Moreover, an intermediate blade member says the member which has a connection part connected with a 1st and 2nd rotating shaft in the both ends of a flat plate, for example.

  As a result, while reducing the number of parts as compared with the prior art, both the first and second rotating shafts included on the door and the wall side and the intermediate blade member connecting them are in a state in which the door is closed. It does not protrude from the open side. As a result, for example, even when it is used as a hinge for a cab door of a construction machine, the hinge member is not attached in a protruding state on the outer surface of the cab. It can avoid leading to problems.

The hinge structure according to the second invention is the hinge structure according to the first invention, and the intermediate blade member is substantially flush with the outer surface of the door and the wall when the door is closed. Is attached.
Here, the intermediate blade member that couples the first and second rotating shafts is disposed so as to be substantially flush (flat) with respect to the outer surface of the door and the wall when the door is closed. In other words, the outer surface of the intermediate blade member is arranged so as to form substantially the same surface as the outer surface of the door and the wall.

  Thereby, for example, when used as a hinge for opening and closing the door of a cab of a construction machine, there is no step in the portion of the intermediate blade member, so that the appearance of the cab can be improved.

The hinge structure according to the third invention is the hinge structure according to the first or second invention, and is provided at the upper and lower ends of the door, respectively.
Here, the hinge structure according to the present invention is attached near the upper and lower ends of the door and the wall. In this case, for example, the first and second rotating shafts may be attached so as to be inserted into holes formed in the upper and lower end surfaces of the door and the wall.
Thereby, the length of the 1st, 2nd rotating shaft and intermediate blade member contained in a hinge structure can be made into the minimum magnitude | size.

A hinge structure according to a fourth invention is the hinge structure according to the third invention, and further includes a cover member that closes a gap formed between the upper and lower end portions.
Here, the gap formed between the hinge structure provided in the vicinity of the upper and lower ends of the door and the wall is covered with a cover member.
Thereby, it can avoid that a clearance gap produces between the hinges divided | segmented and arrange | positioned near upper-lower-end parts vicinity, such as a door.

  A hinge structure according to a fifth aspect of the present invention is a hinge structure that is attached so as to connect a door and a wall and includes two rotating shafts that open and close the door, and includes first and second rotating shafts, and first and second rotating shafts. Two members and an intermediate blade member are provided. The first rotating shaft is a rotating shaft on the door side. The second rotation axis is a wall-side rotation axis. The first member is connected to a part of the door and the first rotating shaft, and is disposed on the wall side when the door is closed. The second member is connected to a part of the wall and the second rotating shaft, and is disposed on the door side when the door is closed, so as to overlap the first member in a front view. The intermediate blade member connects the first rotation shaft and the second rotation shaft via the first and second rotation shafts, and is disposed inside the first member.

Here, the door and the first rotating shaft as its rotating shaft and the wall and the second rotating shaft as its rotating shaft are connected via first and second members corresponding to the door side and wall side hinges, respectively. To do. And the 1st, 2nd rotating shaft connected to the 1st, 2nd member is connected via the intermediate blade member arrange | positioned so that it may overlap with the 1st, 2nd member.
Here, the first member is attached to the door at one end, and is attached to the first rotating shaft at the other end. The second member is attached to the wall at one end and attached to the second rotation shaft at the other end.

  As a result, in a front view, only the door-side first member and the first rotating shaft are exposed on the outer surface, and the door is configured with a biaxial hinge structure having no protrusion on the outside of the door. Can be opened 180 degrees. As a result, for example, even when used as a hinge of a cab door of a construction machine, the appearance is improved, and the occurrence of a problem such that the hinge part protrudes from the outer surface of the cab and is subject to transportation regulations, etc. It can be avoided.

A hinge structure according to a sixth invention is the hinge structure according to the fifth invention, wherein the first and second members and the intermediate blade member are substantially S-shaped when viewed from the axial direction of the first and second rotating shafts. It is configured to be a mold.
Here, the first and second members and the intermediate blade member, which are arranged so as to overlap each other in the above-described front view, are arranged so as to be substantially S-shaped when viewed from the axial direction of the first and second rotating shafts. ing. In other words, the first member connected to the outer surface of the door, the second member connected to the inner surface of the wall, and the intermediate blade member connecting between the two members, the substantially S-shape when viewed from the axial direction. It is formed.

  Thereby, appearance can be improved by making it look like a uniaxial hinge in front view, avoiding that the components which comprise a hinge structure protrude outside.

A hinge structure according to a seventh invention is the hinge structure according to the fifth or sixth invention, wherein the first and second rotating shafts are a predetermined thickness from the axial direction when the door is closed. It is arranged at a position shifted in the opening and closing direction of the door.
Here, when the door is closed, the first and second rotating shafts are arranged with an offset of a predetermined amount, for example, the thickness of one of the first and second members when viewed from the axial direction. ing.
Thereby, even when it arrange | positions so that 1st and 2nd member may overlap in front view, it can be set as the structure which the 1st member does not protrude outside using a common component as 1st and 2nd member. . As a result, the types of components can be reduced and the configuration can be simplified.

A hinge structure according to an eighth invention is the hinge structure according to any one of the fifth to seventh inventions, wherein the door rotates X degrees around the first rotation axis, and the intermediate blade member is Rotate Y degrees around the second rotation axis. However, XY = 180 (degrees).
Here, when the door is opened 180 degrees with respect to the wall, the door is rotated X degrees around the first rotation axis, and the intermediate blade member is rotated Y degrees around the second rotation axis. The relationship between the X degree and the Y degree is XY = 180 degrees.
Accordingly, by rotating the door and the intermediate blade member around the first and second rotation axes by a predetermined angle, the door can be opened 180 degrees with respect to the wall as a result.

The hinge structure according to the ninth invention is the hinge structure according to the eighth invention, wherein X is 270 and Y is 90.
Here, the rotation angle of the door and the intermediate blade member around the first and second rotation axes is restricted to be 270 degrees around the first rotation axis and 90 degrees around the second rotation axis.
As a result, each rotation shaft can be rotated by a predetermined angle, resulting in an opening / closing angle of 180 degrees.

A hinge structure according to a tenth invention is the hinge structure according to any one of the fifth to ninth inventions, wherein the first and second members are stepwise around the first and second rotation axes. Rotate each.
Here, when the door is opened, the first and second members have an opening / closing angle of 180 degrees by rotating stepwise around the first and second rotating shafts with a time difference, for example. It is
Thereby, since the first and second members freely rotate around the two axes, it is possible to avoid the door opening and closing from becoming unstable. As a result, for example, the door can be stably opened and closed by 180 degrees.

A hinge structure according to an eleventh invention is the hinge structure according to any one of the fifth to tenth inventions, wherein the first member or the second member is rotated when the first member or the second member is rotated by a predetermined angle. A stopper for restricting the rotation of the member is further provided.
Here, the rotation angle of the first and second members around the first and second rotation axes is restricted to a predetermined angle by the stopper. For example, the rotation angle of the first member is restricted to 270 degrees on the first rotation shaft side, and the rotation angle of the second member is restricted to 90 degrees on the second rotation shaft side.

  Thereby, since the first and second members freely rotate around the two axes to a predetermined angle or more, it is possible to avoid opening and closing of the door becoming unstable. As a result, for example, the door can be stably opened and closed by 180 degrees.

A cab for a construction machine according to a twelfth aspect includes the hinge structure according to any one of the first to eleventh aspects.
Thereby, as mentioned above, while adopting the biaxial hinge structure, a sufficient opening / closing angle can be secured, and the problem of transportation regulation and the like can be cleared by eliminating the portion protruding to the outside of the cab as the hinge structure. .

  According to the hinge structure according to the present invention, a sufficient opening / closing angle can be secured, and the problem of transportation regulation and the like can be cleared by eliminating the portion protruding to the outside of the cab as the hinge structure.

[Embodiment 1]
A hydraulic excavator (construction machine) 1 equipped with a cab of a construction machine that employs a hinge structure according to an embodiment of the present invention will be described as follows with reference to FIGS.
[Configuration of hydraulic excavator 1 as a whole]
As shown in FIG. 1, a hydraulic excavator 1 according to the present embodiment includes a lower traveling body 2, a swivel base 3, a work implement 4, a counterweight 5, an engine room 6, an equipment room 9, and a cab 10. And.

The lower traveling body 2 has the crawler belt P wound around the left and right ends of the traveling direction rotated to move the excavator 1 forward and backward, and the swivel base 3 is mounted on the upper surface side in a swingable state. .
The swivel base 3 can be swung in any direction on the lower traveling body 2 and has a work machine 4, a counterweight 5, an engine room 6, and a cab 10 mounted on the upper surface.

  The work machine 4 is configured to include a boom 11, an arm 12 attached to the tip of the boom 11, and a bucket 13 attached to the tip of the arm 12. The work machine 4 is a civil engine that excavates earth and sand and gravel while moving the boom 11, the arm 12, the bucket 13 and the like up and down by the hydraulic cylinders 11a, 12a and 13a included in a hydraulic circuit (not shown). Work at the construction site.

The counterweight 5 is made of, for example, scrap iron or concrete in a box formed by assembling steel plates and is hardened. The counterweight 5 is an engine room 6 on the swivel 3 for balancing the vehicle body during mining. It is provided behind.
The engine room 6 is disposed at the rear end of the swivel base 3 on a main frame (not shown) so as to be adjacent to the counterweight 5. The engine room 6 forms a storage space for an engine or the like inside. The engine room 6 stores an engine, an aftercooler, and the like, which are power sources for driving the lower traveling body 2 and the work machine 4, in an internal storage space.

The equipment room 9 is disposed behind the work machine 4 and houses a fuel tank, a hydraulic oil tank, an operation valve, and the like (not shown).
The cab 10 is a driver's cab in which an operator of the excavator 1 gets on and off, and is disposed on the left front side on the swivel 3 so that the tip of the work machine 4 can be seen. . Further, on the left side surface of the cab 10, as shown in FIG. 2 (a), a door for doors (doors) that can be opened and closed with hinges (hinge structures) 21 and 22 as rotation centers (see two-dot chain arrows in the figure). ) 20 is attached. The hinges 21 and 22 are respectively attached to notch portions formed at upper and lower end portions in a connecting portion between the passenger door 20 and the side wall portion 10 a of the cab 10. Moreover, the door 20 for boarding / alighting provided in the left side surface of the cab 10 is locked by a lock mechanism (not shown) in a state of being opened 180 degrees. Thereby, the operator in the cab 10 can operate the hydraulic excavator 1 in a state in which the passenger door 20 is opened 180 degrees.

[Structure of hinges 21 and 22]
In this embodiment, the door 20 for getting on and off for the cab 10 is attached to the side surface of the cab 10 through the hinges 21 and 22 so that it can be opened and closed.
Hereinafter, the hinge 22 attached to the lower end of the hinges 21 and 22 will be described as an example, but the basic configuration of the upper end hinge 21 is also common.

As shown in FIGS. 2B and 3A, the hinge 22 is provided so as to connect lower ends between the door 20 for getting on and off and the side wall portion 10a of the cab 10, and an intermediate This is a two-axis type hinge including a blade (intermediate blade member) 22a and two rotation shafts (first and second rotation shafts) 22b and 22c.
The intermediate blade 22a is connected to the rotary shafts 22b and 22c embedded on the door side and the wall side, respectively, so as to be rotatable, and substantially metal that connects the entrance door 20 and the side wall 10a. It is a made member. And the intermediate blade | wing 22a is attached so that it may be fitted in the notch part formed in the lower end part in the door 20 for boarding / alighting, and the side wall part 10a. Further, as shown in FIG. 3A, the intermediate blade 22 a is disposed along the outer peripheral surface of the cab 10 in a state where the passenger door 20 is closed. Thereby, the connection part of the door 20 for getting on and off and the cab 10 becomes a flat surface, and it is avoiding that a level | step difference is formed.

The rotating shaft (first rotating shaft) 22 b is a rod-like member embedded vertically upward from the lower end portion of the passenger door 20, and is attached so as to be included in the thickness of the passenger door 20. .
The rotating shaft (second rotating shaft) 22c is a rod-like member embedded vertically upward from the lower end portion of the side wall portion 10a of the cab 10, and is attached so as to be included in the thickness of the side wall portion 10a. Yes.

<Movement of hinge 22 when opening / closing door 20 for getting on / off>
The hinge 22 according to the present embodiment changes as shown in FIGS. 3A to 3D in the process of opening the passenger door 20.
Specifically, as shown in FIG. 3A, when the operator of the excavator 1 opens the door 20 from the state where the door 20 is closed, first, FIG. As shown in FIG. 4, only the entrance / exit door 20 rotates on the rotary shaft 22b.

  Next, when the operator further opens the entry / exit door 20, as shown in FIG. 3C, the rotation of the intermediate blade 22a on the rotation shaft 22c is started together with the rotation of the entry / exit door 20 on the rotation shaft 22b. The At this time, the rotation of the passenger door 20 on the rotary shaft 22b is restricted from being further rotated by 90 degrees. As a result, the entrance / exit door 20 is stepped through the first state in which the door 20 and the intermediate blade 22a rotate on the rotary shafts 22b and 22c, respectively, and the second state in which the intermediate blade 22a rotates on the rotary shaft 22c. Therefore, it can be shifted to the fully open state.

And finally, as shown in FIG.3 (d), the boarding door 20 can be opened to the fully open state parallel to the side wall part 10a. At this time, as described above, the door 20 for getting on and off is fixed to the side wall 10a side by the lock mechanism attached to a part of the door 20 for getting on and off.
[Features of the present hinges 21 and 22]
(1)
As shown in FIGS. 3 (a) to 3 (d), the hinge 22 of the present embodiment has two rotating shafts 22 b fixed so as to be enclosed in the entrance door 20 and the side wall 10 a of the cab 10. , 22c and an intermediate blade 22a that is connected to the rotary shafts 22b, 22c in a rotatable state.

  Accordingly, the number of parts can be reduced while adopting the biaxial hinges 21 and 22, and a state where the passenger door 20 is opened 180 degrees can be formed. And since the rotating shafts 22b and 22c are arrange | positioned so that it may be enclosed by the door 20 for boarding / alighting and the side wall part 10a of the cab 10, each component of the hinges 21 and 22 protrudes from the outer peripheral surface of the cab 10. It can be avoided. As a result, it is possible to configure the cab 10 that has fewer parts than before and can easily solve problems such as transportation regulations.

(2)
As shown in FIG. 3A, the hinge 22 of the present embodiment is arranged such that the outer peripheral surface of the intermediate blade 22 a is flat with the surface of the door 20 for getting on and off and the side wall 10 a of the cab 10.
Thereby, it is possible to avoid the formation of a step at the intermediate blade 22a portion in the connecting portion between the entrance door 20 and the side wall portion 10a of the cab 10. As a result, even when the biaxial hinges 21 and 22 are employed, the appearance of the cab 10 can be improved.

(3)
As shown in FIG. 2A, the hinges 22 of the present embodiment are respectively provided at the upper and lower ends of the connecting portion between the passenger door 20 and the side wall 10 a of the cab 10.
Accordingly, the hinges 21 and 22 including the intermediate blade 22a can be easily attached by attaching the rotary shafts 22b and 22c so as to be inserted from the upper and lower end surfaces.

(4)
The cab 10 of this embodiment is mounted on a hydraulic excavator 1 as shown in FIG. 1 and includes hinges 21 and 22 having the above-described hinge structure as shown in FIG.
Thereby, as above-mentioned, the number of parts is smaller than before, and the cab 10 which is easy to clear problems, such as transport restrictions, can be comprised.

[Embodiment 2]
Hinges 61 and 62 employing a hinge structure according to another embodiment of the present invention will be described below with reference to FIGS. 4 (a) to 7 (f).
As in the case of the hinges 21 and 22 of the first embodiment, the hinges 61 and 62 of the present embodiment are used for getting on and off the side portion of the cab 50 mounted on the hydraulic excavator 1 (see FIG. 1), as shown in FIG. The door (door) 60 is attached and fixed in a state where it can be opened and closed. In addition, the hinges 61 and 62 are respectively attached to notch portions formed on the inner side by a predetermined distance from the upper and lower end portions in the connecting portion between the passenger door 60 and the side wall portion (wall side) 50a of the cab 50. Yes.

Hereinafter, the hinge 62 attached to the lower part of the entrance door 60 will be described as an example of the hinges 61 and 62, but the basic structure of the upper hinge 61 is also common.
As shown in FIG. 4B and FIG. 5, the hinge 62 is provided so as to connect lower portions between the entrance door 60 and the side wall portion 50 a of the cab 50. (Member) 62a, two rotation shafts (first and second rotation shafts) 62b and 62c, and first and second members 62e and 62d.

  The intermediate blade 62a is connected to the wall-side and door-side rotary shafts 62b and 62c in a rotatable state, and is substantially a metal member that connects the door for entrance 60 and the side wall 50a. is there. And the intermediate blade | wing 62a is attached so that it may be fitted in the notch part formed in the lower part in the door 60 for getting on / off and the side wall part 50a. Further, as shown in FIG. 5, the intermediate blade 62 a is arranged so as not to be seen from the outer peripheral surface side of the cab 50 together with the wall-side rotary shaft 62 b in a state where the entrance door 60 is closed. Thereby, on the external appearance of the cab 50, the appearance part of the cab 50 can be improved by making the connection part of the entrance / exit door 60 and the cab 50 look like a uniaxial hinge structure.

  The rotation shaft (second rotation shaft) 62b is a rod-like member attached along the vertical direction to the side wall 50a of the cab 50 via the wall-side second member 62d, and opens and closes the entrance / exit door 60. In this case, it functions as the rotation center of the intermediate blade 62a. Further, as shown in FIG. 5, the rotating shaft 62 b is arranged so as not to be seen in a front view from the outside of the cab 50 in a state where the passenger door 60 is closed.

  The rotary shaft (first rotary shaft) 62c is a rod-like member attached along the vertical direction to the passenger door 60 via the first member 62e on the door side, and opens and closes the passenger door 60. Functions as the center of rotation of the first member 62e relative to the intermediate blade 62a. Further, as shown in FIG. 5, the rotary shaft 62c is arranged at a position shifted to the outside of the cab 50 by a predetermined distance d with respect to the wall-side rotary shaft 62b in the cross section. As a result, the door-side rotary shaft 62c and the first member 62e, and the wall-side rotary shaft 62b and the second member 62d, which are connected to each other via the intermediate blade 62a, are configured by the same parts, respectively. Kinds can be reduced.

The second member 62d is a metal member fixed to the wall side, and is attached so as to connect the rotation shaft 62b on the wall side and the side wall portion 50a of the cab 50.
The first member 62e is a metal member attached to the door side, and is attached so as to connect the rotary shaft 62c on the door side and the entrance / exit door 60.
In the present embodiment, as shown in the cross-sectional view shown in FIG. 5, the above-described members are connected so as to have a substantially S shape. That is, a substantially S-shape is formed from the second member 62d to the intermediate blade 62a via the rotating shaft 62b and the first member 62e via the rotating shaft 62c. Thereby, in the front view seen from the outer side of the cab 50, only the rotating shaft 62c on the door side and the first member 62e can be seen in the hinge 62 portion. Thereby, although it is the biaxial type hinge 62, it can be set as the hinge structure of a simple structure like a uniaxial type.

<Movement of Hinge 62 When Opening / Closing Door 60>
The hinge 62 according to the present embodiment changes as shown in FIGS. 6A to 7C in the process of opening the passenger door 60.
Specifically, as shown in FIG. 6 (a), when the operator of the excavator 1 opens the entry / exit door 60 from the state where the entry / exit door 60 is closed, first, FIG. 6 (b). As shown in FIG. 5, the entrance / exit door 60 on the rotating shaft 62c and the intermediate blade 62a on the rotating shaft 62b rotate in parallel.

Next, when the operator opens the entry / exit door 60 further, as shown in FIG. 6C, the rotation of the entry / exit door 60 on the rotation shaft 62c and the rotation of the intermediate blade 62a on the rotation shaft 62b further progress. Go.
Next, as shown in FIG. 7A, when the rotation of the intermediate blade 62a reaches 90 degrees on the rotation shaft 62b, the first rotation restricting portion (stopper) 71 restricts further rotation of the intermediate blade 62a. The On the other hand, on the rotating shaft 62c, the first member 62e on the door side further rotates.

Next, as shown in FIG. 7B, only the door-side first member 62e is further rotated on the rotation shaft 62c.
Finally, as shown in FIG. 7 (c), when the first member 62e on the door side is rotated to 270 degrees on the rotating shaft 62c, the second rotation restricting portion (stopper) 72 causes that of the first member 62e. The above rotation is restricted. At this time, the entry / exit door 60 is locked to the side wall 50a side by a lock mechanism (not shown), and is in a fully open state opened 180 degrees. The first and second rotation restricting portions 71 and 72 are in contact with the intermediate blade 62a and the first member 62e on the door side by projections or the like attached to the rotation shafts 62b and 62c, so that the angle exceeds a predetermined angle. Rotation is restricted.

In the present embodiment, as described above, from the first state in which the entrance door 60 and the intermediate blade 62a rotate on the rotation shafts 62b and 62c, the intermediate blade 62a is locked on the rotation shaft 62b and the door on the rotation shaft 62c. Through the second state in which only the first member 62e on the side rotates, the passenger door 60 can be gradually shifted to the fully open state.
[Features of the hinges 61 and 62]
(1)
In the hinge 62 of the present embodiment, as shown in FIG. 5 and the like, the door-side rotary shaft 62c and the first member 62e, the wall-side rotary shaft 62b and the second member 62d, and the first and second rotary shafts 62b. , 62c for connecting the intermediate blades 62a. The hinge 62 is arranged such that the first member 62e, the intermediate blade 62a, and the second member 62d that are connected to each other via the rotation shafts 62b and 62c overlap in a front view.

  As a result, a biaxial hinge structure is adopted to enable a fully open state of 180 degrees, and the protruding portion on the outer peripheral surface of the cab 50 can be eliminated to easily solve problems such as transportation restrictions. The cab 50 can be configured. In addition, since the first member 62e, the intermediate blade 62a, and the second member 62d that are connected to each other via the rotation shafts 62b and 62c are arranged so as to overlap in a front view, even in the case of the biaxial type, the appearance is improved. Can look like a single axis type. Therefore, the cab 50 with high appearance can be configured.

(2)
As shown in FIG. 5, the hinge 62 of the present embodiment has the rotation shafts 62b and 62c, the first member 62e, and the second member 62d so as to be substantially S-shaped when viewed from the axial direction of the rotation shafts 62b and 62c. The intermediate blade 62a is disposed.
Thereby, in the front view, the intermediate blade 62a, the rotating shaft 62b, and the second member 62d can be hidden by the first member 62e in a state where the passenger door 60 is closed. As a result, the appearance can be improved by showing a single-shaft type hinge structure.

(3)
As shown in FIG. 5, the hinge 62 of the present embodiment is configured such that the door-side rotation shaft 62 c and the wall-side rotation shaft 62 b are shifted in the thickness direction of the passenger door 60.
Thereby, even when the first member 62e, the second member 62d, and the intermediate blade 62a are arranged so as to overlap in a front view, it is possible to avoid the formation of a portion protruding from the outer peripheral surface of the cab 50. Further, the first member 62e that connects the door for getting on and off 60 and the rotating shaft 62c and the second member 62d that connects the side wall 50a of the cab 50 and the rotating shaft 62b are used as a common component. The kind of can be reduced.

(4)
As shown in FIG. 7C, the hinge 62 of the present embodiment is configured such that the difference between the rotation angle X of the door-side rotation shaft 62c and the rotation angle Y of the wall-side rotation shaft 62b is 180 degrees. Thus, the entrance / exit door 60 is brought into a fully open state of 180 degrees.
Thereby, by rotating each member in the rotating shafts 62b and 62c, the boarding door 60 can be brought into a fully open state of 180 degrees as a result.

(5)
As shown in FIG. 7C, the hinge 62 of the present embodiment has a rotation angle X (270 degrees) on the door-side rotation shaft 62c and a rotation angle Y (90 degrees) on the wall-side rotation shaft 62b. With this configuration, the entrance / exit door 60 is fully opened at 180 degrees.
Thereby, by rotating each member around the rotation shafts 62b and 62c by the rotation angle, as a result, a fully open state of 180 degrees can be obtained.

(6)
As shown in FIGS. 6A to 7C, the hinge 62 according to the present embodiment includes the first door 62e on the door-side rotary shaft 62c and the middle on the wall-side rotary shaft 62b. The blades 62a shift to a fully open state of 180 degrees while rotating stepwise. That is, the passenger door 60 is shifted to the fully opened state through the first state in which each member rotates on the rotation shafts 62b and 62c and the second state in which the first member 62e rotates only on the rotation shaft 62c.

Thereby, at the time of opening / closing of the entrance / exit door 60, the movement of the entrance / exit door 60 becomes unstable, and it is possible to prevent the occurrence of problems such as contact with the wall side. As a result, the entry / exit door 60 can be fully opened 180 degrees with stable movement.
(7)
As shown in FIG. 7C, the hinge 62 of the present embodiment is a rotation restricting portion that restricts the rotation angle of the first member 62e on the door-side rotating shaft 62c and the intermediate blade 62a on the wall-side rotating shaft 62b. 71 and 72 are further provided.

Accordingly, it is possible to prevent the opening / closing of the entrance / exit door 60 from being unstable by performing stepwise opening / closing when the entrance / exit door 60 is opened / closed, and to easily set a full opening angle of 180 degrees. be able to.
(8)
The cab 50 of this embodiment is mounted on the hydraulic excavator 1 as shown in FIG. 1, and includes hinges 61 and 62 having the above-described hinge structure as shown in FIG. 4A.

Accordingly, as described above, the cab 50 can be configured that has fewer parts than the conventional one and can easily solve problems such as transportation regulations.
[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the said Embodiment 1, the intermediate blade | wing 22a gave and demonstrated the example arrange | positioned along the surface of the outer side of the door 20 for boarding / alighting and the side wall part 10a. However, the present invention is not limited to this.
For example, as shown in FIG. 8, the hinge 122 may be a linear member that connects the rotation shafts 22 b and 22 c as the intermediate blade (intermediate blade member) 122 a.

Even in this case, since the portion protruding to the outer peripheral surface side of the cab 10 can be eliminated in the hinge structure, problems such as transportation restrictions when the cab is transported can be easily cleared.
However, since it is preferable that there is no step in the hinge portion as the appearance of the cab, it is more preferable that the intermediate blade 22a is arranged along the outer surface of the entrance door 20 or the like as in the first embodiment.

(B)
In the first embodiment, an example has been described in which notched portions for installing the hinges 21 and 22 are provided at the upper and lower ends of the entrance / exit door 20 attached to the side surface of the cab 10. However, the present invention is not limited to this.
For example, as shown in FIG. 9, a cab 110 in which a cover member 23 is attached to a gap formed between the hinges 21 and 22 may be used.

In this case, it is not necessary to provide a notch for attaching the hinges 21 and 22 on the side of the side wall of the passenger door or cab. Then, by closing the gap formed between the hinges 21 and 22 with the cover member, the cab 110 with high appearance can be configured.
(C)
In the first embodiment, the example in which the hinges 21 and 22 are respectively attached to the upper and lower ends of the entrance door 20 has been described. However, the present invention is not limited to this.

For example, the attachment position of the hinge may be a portion slightly inward from the upper and lower ends of the passenger door.
(D)
In the second embodiment, as shown in FIGS. 6A to 7C, the first state where the first and second rotation restricting portions 71 and 72 rotate in both the rotation shafts 62b and 62c, An example has been described in which the door 60 for opening and closing is opened and closed in stages by switching between the second state rotating only by the rotating shaft 62c. However, the present invention is not limited to this.

For example, as shown in FIGS. 10A and 10B, an intermediate blade (intermediate blade member) 222a, a rotation shaft (first rotation shaft) 222b, a rotation shaft (second rotation shaft) 222c, The door for getting on and off and the side wall portion of the cab may be connected by a hinge 222 having a hinge 222d on the door side and a hinge 222e on the wall side.
As shown in FIG. 11A, which is an enlarged view of the P portion shown in FIG. 10B, the hinge 222 is provided with a small diameter portion 225a having a tight tightening margin in a part of the bush (stopper) 225. . As a result, in the biaxial hinge structure, the door for getting on and off can be opened and closed stepwise by adding a rotational resistance at one of the rotary shafts 222c.

  As another configuration of the P portion, as shown in FIG. 11 (b), a hinge 226 attached so that a tightly tightened collar 226b is pressed by a body 226a of a bush 226 (stopper) may be used. Even in this case, in the two-shaft type hinge structure, the entrance / exit door can be opened and closed stepwise by adding a rotational resistance on one of the rotary shafts 222c.

(E)
In the first and second embodiments, an example in which the hinge structure according to the present invention is employed for the hinges 21 and 22 for opening and closing the entrance door 20 of the cab 10 mounted on the excavator 1 has been described. . However, the present invention is not limited to this.
For example, the hinge structure of the present invention may be adopted for a hinge for opening and closing a cab door mounted on another construction machine such as a crane truck, a bulldozer, a wheel loader, or a motor grader.

  In particular, in a cab mounted on a construction machine that may be operated with the entrance door opened 180 degrees during operation, such as the hydraulic excavator or crane vehicle as in Embodiments 1 and 2 described above. It is preferable to employ | adopt with respect.

  Since the hinge structure of the present invention has an effect of securing a sufficient opening / closing angle and eliminating a portion protruding to the outside of the cab to eliminate problems such as transportation restrictions, various door and door opening / closing portions Widely applicable to hinges used in

The perspective view which shows the structure of the whole hydraulic excavator carrying the cab which employ | adopted the hinge structure which concerns on one Embodiment of this invention. (A) is an external view which shows the structure of the cab mounted in the hydraulic excavator of FIG. (B) is the front view which expanded the hinge part which is a part of cab of (a). (A)-(d) is sectional drawing which shows the motion of the hinge at the time of opening and closing the door for boarding / alighting of the cab of FIG. (A) is an external view which shows the structure of the cab containing the hinge which concerns on other embodiment of this invention. (B) is the front view which expanded the hinge part which is a part of cab of (a). The expanded sectional view of the hinge part of FIG.4 (b). (A)-(c) is sectional drawing which shows the motion of the hinge of FIG. 5 at the time of opening and closing a door for boarding / alighting. (A)-(c) is sectional drawing which shows the motion of the hinge of FIG. 5 at the time of opening and closing a door for boarding / alighting. Sectional drawing which shows an example of the hinge structure which concerns on other embodiment of this invention. The external view which shows the structure of the cab which concerns on further another embodiment of this invention. (A) And (b) is sectional drawing and front view which show the structure of the hinge based on further another embodiment of this invention. (A) And (b) is sectional drawing which shows the structure of the bush periphery corresponding to the P section of FIG.10 (b).

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body 3 Turntable 4 Working machine 5 Counterweight 6 Engine room 9 Equipment room 10 Cab 10a Side wall (wall side)
11 Boom 11a Hydraulic Cylinder 12 Arm 12a Hydraulic Cylinder 13 Bucket 13a Hydraulic Cylinder 20 Entry / Exit Door (Door)
21 Hinge (hinge structure)
22 Hinge (hinge structure)
22a Intermediate blade (intermediate blade member)
22b Rotating shaft (first rotating shaft)
22c Rotating shaft (second rotating shaft)
23 Cover member 50 Cab 50a Side wall (wall side)
60 Door for getting on and off (door)
61 Hinge (hinge structure)
62 Hinge (hinge structure)
62a Intermediate blade (intermediate blade member)
62b Rotating shaft (second rotating shaft)
62c Rotating shaft (first rotating shaft)
62d 2nd member 62e 1st member 71 1st rotation control part (stopper)
72 Second rotation restricting portion (stopper)
122a Intermediate blade (intermediate blade member)
222 Hinge 222a Intermediate blade (intermediate blade member)
222b Rotating shaft (first rotating shaft)
222c Rotating shaft (second rotating shaft)
222d Hinge 222e Hinge 225 Bush (stopper)
225a Small diameter part 226 Bush (stopper)
226a body 226b color P crawler belt

Claims (12)

A hinge structure attached to connect the door and the wall and including two rotating shafts for opening and closing the door;
A first rotating shaft arranged to be included in the door side;
A second rotation shaft arranged so as to be included in the wall side;
An intermediate blade member that connects the first rotating shaft and the second rotating shaft to each other;
With hinge structure. The intermediate blade member is attached to be substantially flush with the outer surface of the door and the wall in a state where the door is closed.
The hinge structure according to claim 1. Provided at the upper and lower ends of the door,
The hinge structure according to claim 1 or 2. A cover member that closes a gap formed between the upper and lower ends;
The hinge structure according to claim 3. A hinge structure attached to connect the door and the wall and including two rotating shafts for opening and closing the door;
A first rotation shaft serving as a rotation shaft on the door side;
A second rotating shaft serving as the wall-side rotating shaft;
A first member that is connected to a part of the door and the first rotating shaft, and is disposed on the wall side in a state in which the door is closed;
A second member that is connected to a part of the wall and the second rotating shaft, and is located on the door side and inside the first member when the door is closed;
An intermediate blade member that connects the first rotation shaft and the second rotation shaft via the first and second rotation shafts, and is disposed so as to overlap the first and second members in a front view;
With hinge structure. The first and second members and the intermediate blade member are configured to be substantially S-shaped when viewed from the axial direction of the first and second rotating shafts.
The hinge structure according to claim 5. The first and second rotating shafts are arranged at positions shifted in the opening and closing direction of the door by a predetermined thickness when viewed from the axial direction when the door is closed.
The hinge structure according to claim 5 or 6. The door rotates X degrees around the first axis of rotation;
The intermediate blade member rotates Y degrees around the second rotation axis;
The hinge structure according to any one of claims 5 to 7.
(However, XY = 180 degrees) X is 270, and Y is 90.
The hinge structure according to claim 8. The first and second members rotate around the first and second rotation axes in stages,
The hinge structure according to any one of claims 5 to 9. A stopper for restricting rotation of the first member or the second member when the first member or the second member rotates by a predetermined angle;
The hinge structure according to any one of claims 5 to 10. The hinge structure according to any one of claims 1 to 11 is provided.
Construction machinery cab.

Images