JP2010053663A - Hinge structure and cab for construction machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hinge structure hardly forming a space between a door and a wall when the door is closed. <P>SOLUTION: A hinge 29, having a hinge structure mounted for rotating the door about 180° for the wall, includes a first member 31, a second member 32, an intermediate member 33 and a stopper 43. The first member 31 is fixed on the wall. The second member 32 is fixed on the door. The intermediate member 33 is rotatably connected with the first member 31 and the second member 32 around a first rotary shaft 36 and a second rotary shaft 37 respectively. The stopper 43 is structured to regulate the rotation angle of the second rotary shaft 37 and has a sixth part (bolt) 56 for adjusting the rotation angle of the door-closing side. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a hinge structure and a cab of a construction machine using the hinge structure, and more particularly to a hinge structure for attaching a door so that the door can be opened by rotating about 180 degrees with respect to a wall and a cab of a construction machine using the hinge structure. .

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.
In the case of a construction machine, there is a case where an operator performs a driving operation with the door opened about 180 degrees. Thus, for example, Patent Document 1 discloses a hinge structure that employs a biaxial hinge including two rotational axes in order to ensure an opening / closing angle of 180 degrees.
Japanese Patent Laying-Open No. 2005-88885 (published April 7, 2005)

However, the conventional cab for construction machines has the following problems.
In the biaxial hinge structure, the rotation angle of each rotation shaft is restricted to a predetermined angle, thereby restricting the angle of the entire hinge structure. For example, in a biaxial hinge structure for rotating about 180 degrees, each rotating shaft is set to rotate 90 degrees.

However, since an error in manufacturing occurs, it is necessary to secure a gap angle larger than the original gap angle between the contact portions of the stopper in order to absorb the error. Such troubles occur.
For example, in a hinge structure provided with a stopper that allows the cab side wall hinge and intermediate blade member to rotate 90 degrees, and an intermediate blade member and door side hinge that can rotate 90 degrees, the door is closed. Assume that the door side hinge contact portion is manufactured such that a clearance angle of 90 degrees or more (for example, 92 degrees) is provided with respect to the contact portion of the intermediate blade member. In this case, since the reaction force of the seal for preventing water leakage always acts on the door, with the door closed, the door-side hinge is rotated 90 degrees or more with respect to the intermediate blade member, The intermediate blade member is rotated by 90 degrees or less with respect to the door side hinge. In such a state, a gap is formed between the cab and the door, causing problems of water leakage and appearance deterioration.

  An object of the present invention is to provide a hinge structure in which a gap is hardly generated between a door and a wall when the door is closed.

A hinge structure according to a first aspect of the present invention is a hinge structure that is attached so that a door rotates about 180 degrees with respect to a wall, and includes a first member, a second member, an intermediate member, and a stopper. ing. The first member is fixed to the wall. The second member is fixed to the door. The intermediate member is connected to the first member and the second member so as to be rotatable about the first rotation shaft and the second rotation shaft, respectively. The stopper is a structure for restricting the rotation angle of at least one of the first rotation shaft and the second rotation shaft, and has an adjustment member for adjusting the rotation angle on the door closing side.
In this hinge structure, when the door is opened and closed, the second member rotates about the second rotation axis with respect to the intermediate member, and the intermediate member rotates about the first rotation axis with respect to the first member. As a result, the door moves between a closed state with respect to the wall and a 180 degree open state.
In this hinge structure, each member can be manufactured and assembled so that a gap angle greater than the original gap angle is provided in the stopper, and then the adjustment member can be adjusted so that the stopper functions at the original gap angle. As described above, when the door is closed, a gap is hardly generated between the door and the wall.

The hinge structure according to the second invention is the hinge structure according to the first invention, and the adjustment member is provided at least between the intermediate member and the second member.
In this hinge structure, the rotation angle on the closing side of the intermediate member and the second member is adjusted by the adjustment member.

A hinge structure according to a third invention is the hinge structure according to the first or second invention, and the adjustment member is a screw member.
In this hinge structure, the screw member can be rotated and moved to fill the gap between the contact portions.

A hinge structure according to a fourth invention is the hinge structure according to any one of the first to third inventions, and the stopper further includes a hard member with which the adjustment member can abut.
In this hinge structure, the stopper is constituted by an adjustment member and a hard member, and the adjustment member is supported by contacting the hard member. Therefore, wear is unlikely to occur in the portion that contacts the adjustment member.

  Since the cab of the construction machine according to the fifth invention includes the hinge structure according to any one of the first to fourth inventions, the above-described excellent effect can be obtained.

  According to the hinge structure according to the present invention, it is difficult for a gap to be generated between the door and the wall with the door closed.

[Embodiment 1]
A hydraulic excavator 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 with reference to FIG.

[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 end portions in the traveling direction to turn the hydraulic excavator 1 forward and backward, and the swivel base 3 is mounted on the upper surface side so as to be able to turn. Yes.
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 implement 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, as shown in FIG. 1, a passenger door 20 that can be opened and closed with the hinges 29 and 30 as pivot centers is attached to the left side surface of the cab 10. The hinges 29 and 30 are respectively attached to recesses formed at the upper and lower portions in the connecting portion between the passenger door 20 and the side wall 19 of the cab 10. Moreover, the door 20 for boarding / alighting provided in the left side surface of the cab 10 is latched by the latching structure 26 in the state opened 180 degree | times. 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 29 and 30]
(A) Basic structure In this embodiment, the door 20 for getting on and off to the cab 10 is attached to the side surface of the cab 10 through the hinges 29 and 30 so that it can be opened and closed. The hinges 29 and 30 are respectively attached to notch portions formed on the inner side by a predetermined distance from the upper and lower ends of the connecting portion between the passenger door 20 and the side wall 19 of the cab 10. In the following description, the side ends closest to each other in the door 20 and the side wall portion 19 will be described as the end portions 20a and 19a of both members.

Hereinafter, the hinge 29 attached to the upper part of the hinges 29 and 30 will be described as an example, but the basic configuration is common to the hinge 30 attached to the lower part. In the following description, the left side of FIG. 1 is described as the front side, and the right side of FIG. 1 is described as the rear side.
As shown in FIGS. 2 to 4, the hinge 29 is provided so as to connect the end portions 20 a and 19 a of the side wall 19 of the cab 10 with the first door 31 and the second member 31. Mainly composed of the member 32 and the intermediate member 33. The hinge 29 is a two-axis type hinge having two rotating shafts 36 and 37. 2 to 4 show the state of the hinge 29 when the door 20 is closed.

The first member 31 is a member fixed to the side wall portion 19. As is apparent from the drawing, the first member 31 has a shape that extends long in the vertical direction, and also has a certain length in the outer direction of the door 20. On both the upper and lower sides of the first member 31, first support portions 31 a for rotatably supporting the first rotation shaft 36 are formed.
The second member 32 is a member fixed to the door 20. As shown in the drawing, the second member 32 is a substantially plate-like member extending long in the vertical direction. Moreover, the 2nd support part 32a for supporting the 2nd rotating shaft 37 rotatably is formed in the up-and-down both sides of the 2nd member 32. As shown in FIG.

  The intermediate member 33 has a substantially rectangular plate-shaped main body. The intermediate member 33 further includes a shaft cylinder 33a into which a core rod constituting the first rotation shaft 36 is inserted, and a shaft cylinder 33b into which a core rod constituting the second rotation shaft 37 is inserted. Yes. The shaft cylinder 33a is provided on the rear side of the main body, and the shaft cylinder 33b is provided on the front side of the main body. The first rotation shaft 36 and the second rotation shaft 37 extend vertically in the vertical direction.

In a state where the door 20 is closed, the intermediate member 33 and the second member 32 extend from the first member 31 to the front side substantially in parallel. And in this state, the intermediate member 33 is arrange | positioned along the surface of the outer side of the door 20 for boarding / alighting and the side wall part 19, as shown to each (a) of FIGS.
As shown in FIGS. 2 to 4, the second rotation shaft 37 is provided at the end 20 a of the door 20, and the first rotation shaft 36 is a predetermined distance corresponding to the width of the intermediate member 33 from the end 20 a. It is provided at a position separated by only a distance.

  In this embodiment, the first turning shaft 36 has a shaft tightening margin smaller than that of the second turning shaft 37 to provide a turning resistance. Therefore, the second rotation shaft 37 is easier to rotate than the first rotation shaft 36. In addition, as a technique for setting the shaft tightening margin small, a collar having a small diameter portion provided in a part of the bushing in the shaft cylinders 33a and 33b, or a collar in which the tightening margin is tightened by a member different from the bushing is used It can be inserted.

(B) Structure of stopper Next, a stopper that regulates the rotation angle of each member will be described. The hinge 29 has a first stopper (41, 42) and a second stopper (43, 44). The first stoppers (41, 42) are structures for restricting the rotation angle of the first member 31 and the intermediate member 33. The second stoppers (43, 44) are structures for regulating the rotation angle of the intermediate member 33 and the second member 32.

(B-1) 1st stopper The 1st stopper (41,42) has controlled the rotation angle of the 1st member 31 and the intermediate member 33 to about 90 degree | times, the door closing side stopper 41, and the door opening side And a stopper 42.
The door closing side stopper 41 realizes a limit when the intermediate member 33 rotates clockwise with respect to the first member 31, and the first portion 51 of the first member 31 and the intermediate member 33 The second portion 52 is configured. As shown in FIG. 4, the first portion 51 is a protrusion formed at the center in the vertical direction of the front side surface of the first member 31. As shown in FIG. 4, the second portion 52 is a protrusion formed at the center in the vertical direction on the back side surface of the intermediate member 33. As shown in FIGS. 4 and 8A, the first portion 51 and the second portion 52 are in contact with each other along the rotation direction of the first rotation shaft 36 with the door 20 closed. Yes.

  The door opening side stopper 42 realizes a limit when the intermediate member 33 rotates counterclockwise with respect to the first member 31, and the third portion 53 of the first member 31 and the intermediate member 33 are realized. 4th part 54 of this. As shown in FIG. 4, the third portion 53 is a protrusion formed on the upper portion of the front side surface of the first member 31. As shown in FIG. 3, the fourth portion 54 is a protrusion formed on the upper side portion of the side portion of the intermediate member 33. The third portion 53 and the fourth portion 54 are in contact with each other along the rotation direction of the first rotation shaft 36 as shown in FIG. 6B with the door 20 opened 180 degrees.

(B-2) Second stopper As shown in FIGS. 8B and 9, the second stopper (43, 44) regulates the rotation angle of the intermediate member 33 and the second member 32 to about 90 degrees. The door closing side stopper 43 and the door opening side stopper 44 are provided.
The door closing side stopper 43 realizes a limit when the second member 32 rotates clockwise with respect to the intermediate member 33, and the fifth portion 55 of the second member 32 and the intermediate member 33 The sixth portion 56 is configured. As shown in FIGS. 4 and 9, the fifth portion 55 is a pin having a circular cross section provided on a pair of protrusions 32 b extending rearward from both sides in the vertical direction of the rear portion on the back side of the second member 32. This pin is formed of a hard material having a higher hardness than the material of the protrusion 32b. Therefore, the fifth portion 55 is not easily worn even if it abuts against the tip of the bolt. The sixth portion 56 is a bolt provided on the intermediate member 33 as shown in FIGS. 4 and 9. The intermediate member 33 is formed with protrusions 33c protruding from both sides in the vertical direction. The protrusion 33c is formed with a screw hole 33d, and a bolt is screwed into the screw hole 33d. More specifically, the bolt is screwed into the screw hole 33d formed in the protrusion 33c of the intermediate member 33 from the front side, and the tip protrudes to the back side. The fifth portion 55 and the sixth portion 56 (specifically, the front ends of the bolts) of the second rotating shaft 37 are shown in FIGS. 5A and 9 with the door 20 closed. They are in contact with each other along the direction of rotation.

The bolt that is the sixth portion 56 can move in the axial direction by rotating with respect to the intermediate member 33, and the clearance angle with the fifth portion 55 can be adjusted. Thereby, the regulation angle of the door closing side stopper 43 is adjusted.
The door opening side stopper 44 realizes a limit when the second member 32 rotates counterclockwise with respect to the intermediate member 33, and the seventh portion 57 of the second member 32 and the intermediate member 33 are realized. 8th part 58 of this invention. As shown in FIG. 4, the seventh portion 57 is a protrusion formed at the center in the vertical direction of the rear side end of the back side of the second member 32. As shown in FIG. 3, the eighth portion 58 is a protrusion formed at the center in the vertical direction on the front side of the front side of the intermediate member 33. The seventh portion 57 and the eighth portion 58 are in contact with each other along the rotation direction of the second rotation shaft 37 as shown in FIG. 8B with the door 20 opened 180 degrees.

[Operation of hinges 29 and 30]
Next, the movement of the hinges 29 and 30 when opening and closing the entrance door 20 will be described. Each of FIG. 5 to FIG. 8A shows a state in which the door 20 is closed, and each of FIG. 5 to FIG. 8B shows a state in which the door 20 is opened 180 degrees. Each figure also shows the posture of the member with the door 20 opened 90 degrees using a two-dot chain line, but this posture is in the middle of the door 20 shifting from the closed state to the 180 degree opened state. The opposite is not the case.

a) Opening Operation When the door 20 is closed, as shown in FIG. 8A, the intermediate member 33 is moved relative to the first member 31 by the door closing side stopper 41 of the first stopper (41, 42). Cannot rotate around. Further, as shown in FIG. 5A, the second member 32 cannot be rotated clockwise with respect to the intermediate member 33 by the door closing side stopper 43 of the second stopper (43, 44).

  From this state, when the operator of the excavator 1 opens the entry / exit door 20, first, as shown in FIG. 8B, the entry / exit door 20 rotates on the second rotation shaft 37. That is, the second member 32 rotates counterclockwise with respect to the intermediate member 33. For this reason, the intermediate member 33 does not change its posture with respect to the first member 31, but as shown in FIG. 9, the second member 32 rotates to be at the door closing side stopper 43 of the second stopper (43, 44). The fifth portion 55 moves away from the sixth portion 56.

When the operator further opens the entry / exit door 20 and the second member 32 rotates 90 degrees with respect to the intermediate member 33, the door opening of the second stopper (43, 44) is performed as shown in FIG. In the side stopper 44, the eighth portion 58 (two-dot chain line) contacts the seventh portion 57.
When the operator further opens the entry / exit door 20, the second member 32 and the intermediate member 33 are united and rotated about the first rotation shaft 36 with respect to the first member 31. That is, the second rotating shaft 37 moves with these members. As a result, the second portion 52 moves away from the first portion 51 in the door closing side stopper 41 of the first stopper (41, 42).

  When the operator further opens the entrance door 20, the third portion 53 contacts the fourth portion 54 in the door opening side stopper 42 of the first stopper (41, 42), as shown in FIG. 6B. Touch. As a result, the second member 32 and the intermediate member 33 stop rotating with respect to the first member 31. In this state, the intermediate member 33 is rotated 90 degrees with respect to the first member 31, and the second member 32 is rotated 90 degrees with respect to the intermediate member 33, in other words, the second member 32. Is rotated 180 degrees with respect to the first member 31.

As described above, the door 20 is opened 180 degrees, and the door opening operation is completed.
In this state, the entry / exit door 20 is in a fully open state parallel to the side wall portion 19, and the hook 28 of the door 20 is locked to the locking portion 27 of the side wall portion 19 in the locking structure 26. ing. That is, the entrance / exit door 20 is fixed to the side wall 19. Since the accuracy of the angle regulation of the hinge 29 is high, the door 20 is securely locked to the side wall portion 19 by the locking structure 26. In other words, in the locking structure 26, the hook 28 is accurately moved to the position of the locking portion 27.

b) Closing Operation When the door 20 is opened, the intermediate member 33 is opposed to the first member 31 by the door opening side stopper 42 of the first stopper (41, 42) as shown in FIG. Cannot rotate clockwise. Further, as shown in FIG. 8B, the second member 32 cannot be rotated counterclockwise with respect to the intermediate member 33 by the door opening side stopper 44 of the second stopper (43, 44).

  When the operator of the excavator 1 closes the entry / exit door 20 from this state, the entry / exit door 20 first rotates on the second rotation shaft 37. That is, the second member 32 rotates clockwise with respect to the intermediate member 33. Therefore, the intermediate member 33 does not change its posture with respect to the first member 31, but the second member 32 rotates and the eighth portion 58 becomes the seventh in the door opening side stopper 44 of the second stopper (43, 44). Move away from portion 57.

When the operator further opens the entry / exit door 20, the second member 32 rotates 90 degrees with respect to the intermediate member 33, and the fifth portion 55 is moved at the door closing side stopper 43 of the second stopper (43, 44). It abuts on the sixth portion 56.
When the operator further closes the entry / exit door 20, the second member 32 and the intermediate member 33 are united and rotate around the first rotation shaft 36 with respect to the first member 31. That is, the 2nd rotation axis | shaft 37 also moves with these members. As a result, the third portion 53 moves away from the fourth portion 54 in the door opening side stopper 42 of the first stopper (41, 42).

When the operator further closes the entrance / exit door 20, the second portion 52 comes into contact with the first portion 51 in the door closing side stopper 41 of the first stopper (41, 42). As a result, the second member 32 and the intermediate member 33 stop rotating with respect to the first member 31.
As described above, the door 20 is closed and the door closing operation is completed.
As described above, in this embodiment, since the shaft tightening margin of the second rotation shaft 37 is set smaller than the first rotation shaft 36, only the second member 32 rotates in the door opening operation. Through the first stage and the second stage in which the second member 32 and the intermediate member 33 are rotated, the passenger door 20 can be shifted to the fully opened state step by step. Even in the door closing operation, the entrance door 20 is closed in a stepwise manner through the first stage in which only the second member 32 rotates and the second stage in which the second member 32 and the intermediate member 33 rotate. Can be migrated.

[Features of this embodiment]
(A)
The hinge 29 is a hinge structure that is attached to the door 20 so as to rotate about 180 degrees with respect to the side wall portion 19, and includes a first member 31, a second member 32, an intermediate member 33, and a stopper 43. I have. The first member 31 is fixed to the side wall portion 19. The second member 32 is fixed to the door 20. The intermediate member 33 is connected to the first member 31 and the second member 32 so as to be rotatable around the first rotation shaft 36 and the second rotation shaft 37, respectively. The stopper 43 is a structure for restricting the rotation angle of the second rotation shaft 37 and has a sixth portion 56 for adjusting the rotation angle on the door closing side. The sixth portion 56 is a bolt screwed into the protrusion 33 c of the intermediate member 33. Further, the fifth portion 55 facing the sixth portion 56 is a pin or sphere having a circular cross section fixed to the protruding portion 32 a of the second member 32.

In this hinge structure, when the door 20 is opened and closed, the second member 32 rotates about the second rotation shaft 37 with respect to the intermediate member 33, and the intermediate member 33 rotates with respect to the first member 31. Rotate around 36. As a result, the door 20 moves between the closed state and the 180 degree opened state with respect to the side wall portion 19.
In this hinge structure, each member is manufactured and assembled in the stopper 43 so that a clearance angle larger than the original clearance angle is provided, and then the stopper 43 functions at the original clearance angle by the bolts as the sixth portion 56. Can be adjusted. As described above, when the door 20 is closed, a gap is hardly generated between the door 20 and the side wall portion 19.

(B)
The sixth portion 56 of the stopper 43 is a bolt capable of adjusting the clearance angle. Therefore, the rotation angle between the contact portions can be adjusted by moving the bolt while rotating. In this way, the rotation angle of the stopper can be adjusted easily and accurately.

(C)
The pin or sphere which is the fifth portion 55 is made of a material having higher hardness than the material constituting the second portion 32.
In this hinge structure, the stopper 43 is constituted by a fifth portion 55 and a sixth portion 56, and the sixth portion 56 is supported in contact with the fifth portion 55. Therefore, the second member 32 is less likely to be worn.
In this embodiment, the adjustment member is employed for the stopper 43, but the present invention is not limited to this. For example, an adjustment member may be employed for another stopper.

[Second Embodiment]
A hinge 60 as another embodiment of the present invention will be described with reference to FIGS. In addition, description is simplified or abbreviate | omitted about the structure similar to the said embodiment.
(A) Structure of Hinge The hinge 60 mainly includes a first member 61, a second member 62, and an intermediate member 63. The hinge 60 is a two-axis type hinge having two rotating shafts 66 and 67. FIG. 10 shows a state of the hinge 60 when the door is closed.

The first member 61 is a member fixed to the side wall portion. The first member 61 has a shape extending long in the vertical direction as shown in FIG. 11, and the first member 61 has a certain length in the outer direction of the door as shown in FIG. have. On the upper and lower sides of the first member 61, first support portions 61a for rotatably supporting the first rotation shaft 66 are formed.
The second member 62 is a member fixed to the door. As is apparent from FIG. 13, the second member 62 is a generally plate-like member that extends long in the vertical direction. Moreover, the 2nd support part 62a for supporting the 2nd rotating shaft 67 rotatably is formed in the up-and-down both sides of the 2nd member 62. As shown in FIG.
The intermediate member 63 has a substantially rectangular plate-shaped main body. The intermediate member 63 further includes a shaft tube portion 63b into which the core rod constituting the first rotation shaft 66 is inserted, and a shaft tube portion 63c into which the core rod constituting the second rotation shaft 67 is inserted. is doing. As shown in FIG. 15, the shaft tube portion 63b and the shaft tube portion 63c extend in the vertical direction.

(B) Structure of stopper Next, a stopper that regulates the rotation angle of each member will be described. Here, only the first stopper 71 and the second stopper 72 which are door closing side stoppers will be described.

(B-1) 1st stopper The 1st stopper 71 is a door closing side stopper for restricting the rotation angle of the 1st member 61 and the intermediate member 63 to about 90 degree | times.
The first stopper 71 realizes a limit when the intermediate member 63 rotates clockwise with respect to the first member 61, and the first portion 81 of the first member 61 and the first member 81 of the intermediate member 63 2 parts 82. The first portion 81 is a bolt fixed to the first member 61. As shown in FIGS. 11 and 12, a protrusion 91 is formed so as to extend from the center in the vertical direction of the front side surface of the first member 61 to the front side, and a screw hole 91a is formed in the protrusion 91. The bolt as the first portion 81 is screwed into the screw hole 91a. The bolt is inserted into the screw hole 91a from the back side and protrudes to the front side. As shown in FIGS. 15 and 16, the second portion 82 is a sphere embedded in the center in the vertical direction on the back side surface of the intermediate member 63. The first portion 81 (the tip of the bolt) and the second portion 82 are in contact with each other along the rotation direction of the first rotation shaft 66 with the door closed.

(B-2) Second stopper The second stopper 72 is a door closing side stopper for restricting the rotation angle of the second member 62 and the intermediate member 63 to about 90 degrees.
The second stopper 72 realizes a limit when the second member 62 rotates clockwise with respect to the intermediate member 63, and the third portion 83 of the second member 62 and the second portion of the intermediate member 63 4 parts 84. The third portion 83 is a bolt fixed to the second member 62. As shown in FIGS. 13 and 14, the second member 62 is formed with protrusions 92 extending rearward from the ends on both sides in the vertical direction. The protrusion 92 has a screw hole 92a, and the screw hole 92a has a screw hole 92a. The bolt as the above-mentioned third portion 83 is screwed. The bolt is inserted into the screw hole 92a from the back side and protrudes to the front side. As shown in FIGS. 15 and 16, the fourth portion 84 is a sphere embedded at both ends in the vertical direction on the back side surface of the intermediate member 63. The third portion 83 (the tip of the bolt) and the fourth portion 84 are in contact with each other along the rotation direction of the second rotation shaft 67 with the door closed.

  In this embodiment, the same effect as that of the embodiment can be obtained. For example, in this hinge structure, each member is manufactured and assembled in the first stopper 71 or the second stopper 72 so that a gap angle larger than the original gap angle is provided, and then the first part 81 or the third part The bolts 83 can be adjusted so that the first stopper 71 or the second stopper 72 functions at the original clearance angle. As described above, when the door is closed, a gap is hardly generated between the door and the side wall.

[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 first and second embodiments, an example in which the hinge structure according to the present invention is used for the hinges 29 and 30 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, it is used for cabs that are mounted on construction machines that may be operated with the doors for getting on and off fully opened 180 degrees during operation, such as hydraulic excavators and crane trucks as in the above-described embodiments. It is preferred that

  Since the hinge structure of the present invention has an effect that a gap is hardly generated between the door and the wall when the door is closed, the hinge structure can be widely applied to hinges used for various doors and door opening / closing portions. .

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. The side view of the hinge structure which concerns on one Embodiment of this invention. The perspective view which looked at the hinge structure from the front side. The perspective view which looked at the hinge structure from the back side. It is a VV sectional view of Drawing 2, (a) is a figure showing the state where the door was closed, and (b) is a figure showing the state where the door was opened 180 degrees. FIG. 4 is a cross-sectional view taken along the line VI-VI in FIG. 2, (a) showing a state where the door is closed, and (b) showing a state where the door is opened 180 degrees. It is a VII-VII sectional view of Drawing 2, (a) is a figure showing the state where a door was closed, and (b) is a figure showing the state where a door was opened 180 degrees. It is a VIII-VIII sectional view of Drawing 2, (a) is a figure showing the state where a door was closed, and (b) is a figure showing the state where a door was opened 180 degrees. Schematic for demonstrating the adjustment member of the door closing side stopper of a 2nd stopper. Schematic of the hinge structure in 2nd Embodiment. The top view of the 1st member of a hinge structure. The front view of the 1st member of a hinge structure. The top view of the 2nd member of a hinge structure. The front view of the 2nd member of a hinge structure. The top view of the intermediate member of a hinge structure. The front view of the intermediate member of a hinge structure.

Explanation of symbols

1 Excavator (construction machine)
DESCRIPTION OF SYMBOLS 2 Lower traveling body 3 Swivel stand 4 Working machine 5 Counterweight 6 Engine room 9 Equipment room 10 Cab 11 Boom 11a Hydraulic cylinder 12 Arm 12a Hydraulic cylinder 13 Bucket 13a Hydraulic cylinder 19 Side wall (wall)
19a End 20 Entrance door (door)
20a end portion 26 locking structure 27 locking portion 28 hook 29 hinge 30 hinge 31 first member 31a first support portion 32 second member 32a second support portion 33 intermediate member 33a shaft tube 33b shaft tube 33c projection 33d screw hole 36 First rotation shaft 37 Second rotation shaft 41 Door closing side stopper 42 Door opening side stopper 43 Door closing side stopper (stopper)
44 Door opening side stopper 51 1st part 52 2nd part 53 3rd part 54 4th part 55 5th part (hard member)
56 6th part (adjustment member, screw member)
57 7th part 58 8th part 60 Hinge (hinge structure)
61 1st member 61a 1st support part 62 2nd member 62a 2nd support part 63 Intermediate member 63b Shaft cylinder part 63c Shaft cylinder part 66 1st rotating shaft 67 2nd rotating shaft 71 1st stopper (stopper)
72 Second stopper (stopper)
81 1st part (adjustment member, screw member)
82 Second part (hard part)
83 Third part (adjustment member, screw member)
84 4th part (hard part)
91 Projection 91a Screw hole 92 Projection 92a Screw hole

Claims (5)

A hinge structure attached to the door so as to rotate about 180 degrees with respect to the wall,
A first member fixed to the wall;
A second member fixed to the door;
An intermediate member coupled to the first member and the second member so as to be rotatable about a first rotation shaft and a second rotation shaft, respectively;
It is a structure for restricting the rotation angle of at least one of the first rotation shaft and the second rotation shaft, and has an adjustment member for adjusting the rotation angle on the door closing side. A stopper,
With hinge structure.   The hinge structure according to claim 1, wherein the adjustment member is provided at least between the intermediate member and the second member.   The hinge structure according to claim 1, wherein the adjustment member is a screw member.   The hinge structure according to claim 1, wherein the stopper further includes a hard member with which the adjustment member can come into contact. A cab for a construction machine comprising the hinge structure according to any one of claims 1 to 4.

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