JP4523360B2 - Construction machinery cab - Google Patents

Description

  The present invention relates to a cab for construction machinery that is suitably used for, for example, a hydraulic excavator or a hydraulic crane.

  Generally, a hydraulic excavator as a construction machine generally includes a lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a work device that is provided on the upper revolving body so as to be able to be lifted and lowered. Has been. Further, a cab that defines a cab is provided on the frame of the upper swing body (see, for example, Patent Document 1).

  A cab for a construction machine according to this type of prior art includes a cab box having an upper surface portion, a front surface portion, a rear surface portion, and left and right side surfaces, and one side surface portion of the left and right side surfaces of the cab box. And a door that opens and closes an entrance through which an operator gets on and off, and an air conditioner that is provided in the cab box and supplies conditioned air into the room while taking in outside air.

  As another conventional technique, one side of the cab box is provided with doors and windows in front and rear with an intermediate pillar interposed therebetween, and these doors and windows are hinged to the intermediate pillar, respectively. A configuration is also known in which these hinges are connected so as to be rotatable using a common (single) hinge shaft (see, for example, Patent Document 2).

  In this case, the door and the window are opened and closed independently with a common hinge shaft as a fulcrum (rotation center) so that the number of parts required for hinge coupling can be reduced. .

JP-A-4-27618 JP-A-9-136543

  By the way, the construction machine cab according to the above-described prior art (Patent Document 1) has a configuration in which an outside air introduction portion for taking outside air into the air conditioner is provided on the side frame of the swivel frame located below the floor plate. Therefore, the length of the duct connecting the outside air introduction part to the blower of the air conditioner becomes long, and there is a problem that workability at the time of assembly is poor and workability at the time of maintenance is also lowered.

  In view of this, the present inventors have considered providing an outside air introduction portion at a position on the rear side of the entrance / exit on one side surface of the cab box provided with the entrance / exit for the operator. However, in this case, it is necessary to provide an outside air filter in order to take in clean air from the outside air toward the blower of the air conditioner, etc., and to maintain and check this outside air filter. It is necessary to provide an inspection opening and an inspection cover for opening and closing the inspection opening from the outside of the cab.

  And in order to provide such an inspection cover on the side surface so as to be openable and closable, it is necessary to newly secure a space for connecting the inspection cover on the side surface, and the rear side of the entrance / exit on the side surface portion. There is a problem that the layout design at the position becomes difficult.

  On the other hand, in another prior art (Patent Document 2), a front and rear doors and windows are provided on one side surface of a cab box with an intermediate pillar interposed therebetween, and the door and window are hinged to the intermediate pillar, respectively. In addition to being coupled, these hinges are connected so as to be rotatable using a common hinge shaft.

  As a result, the other prior art can share a part of the hinges of both the door and the window, reduce the number of parts, and add extra to the intermediate pillar located between the door and the window. There is an advantage that it is not necessary to secure a space and the layout design becomes easy.

  However, in a work site where the ambient temperature is high, for example, in summer, the door and the window are often opened, and in such a case, the door and the window having the hinges in common are used. There is a risk of mutual interference in the half-open state. For this reason, other conventional techniques do not necessarily employ a practical configuration.

  In addition, in this case, since the door and the window are connected to each other by using at least two or more hinges spaced upward and downward, the door and the window are respectively connected to the intermediate pillars. There is a problem that it takes time to perform the hinge connection, and the workability during assembly cannot be improved.

  The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to connect an inspection cover for inspecting 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 an object of the present invention to provide a cab for construction machinery that can easily secure a space for hinged connection between them and can increase the degree of freedom in layout design.

  Another object of the present invention is that the inspection cover such as an outside air filter is significantly smaller and lighter than a boarding door, and the inspection cover can be opened and closed using a pair of hinges. An object of the present invention is to provide a cab for a construction machine that can be used.

To solve the problems described above, the present invention includes a cab box with an entrance for the operator to enter and exit the side surface portion provided on the frame for a construction machine, rotatably provided on a side surface portion of the cab box the A door that opens and closes the entrance / exit, a part of the side surface of the cab box, a window glass provided on the rear side of the entrance / exit, and conditioned air is supplied into the room while taking in outside air provided in the cab box And the door for opening and closing the entrance is applied to a cab for a construction machine that is attached to a side portion of the cab box using a plurality of hinges spaced apart from each other in the upper and lower directions of the door. The

The feature of the configuration invention of claim 1 is employed, wherein the cab box, in the rear side of the entrance, and maintenance outside air filter of the air conditioning system at a position which is a lower side of the window glass, inspection An inspection opening for opening the inspection opening and an inspection cover for opening and closing the inspection opening, and the hinge located on the upper side of the plurality of hinges is provided at a position on the side where the window glass is provided. Used only for opening and closing, the lower hinge is provided at a lower position than the window glass, and the inspection cover shares the lower hinge serving as a pivot for the door. The configuration is such that the cab box is rotatably attached to the side surface of the cab box.

  According to the invention of claim 2, the cab box is provided with a pillar extending upward and downward in an intermediate portion in the front and rear directions, the entrance is provided on the front side of the pillar, and the rear side is provided on the rear side. The inspection opening is provided, and the pillar is provided with the door that opens and closes the entrance / exit using the hinge and the inspection cover that opens and closes the inspection opening.

According to a third aspect of the present invention, the hinge shared by the inspection cover and the door includes a first hinge plate attached to the cab box, a second hinge plate attached to the door, and the inspection cover. And a single hinge shaft that rotatably connects the second hinge plate and the third hinge plate to the first hinge plate.

As described above, according to the invention described in claim 1, the Kyabubokku scan, at the rear side of the door opening, and maintain the outside air filter of the air conditioner at a position which is a lower side of the window glass, for checking An inspection opening and an inspection cover for opening and closing the inspection opening are provided, and among the plurality of hinges, the hinge located on the upper side is provided at a position on the side where the window glass is provided, and only opens and closes the door. used, the hinge positioned on the lower side is provided at a position lower than the window glass, the inspection cover, share a hinge located at the lower side of the pivot point of the door to the cab box Since it is configured to be pivotably mounted, the hinge used for the door for getting on and off and the hinge of the inspection cover can be partly used, reducing the number of parts and improving the workability during assembly. be able to In addition, by using a hinge that is partially shared in this way, the door for entrance and exit and the inspection cover are connected to each other so as to be openable and closable, so that it is possible to easily secure a space for connecting the hinges to the cab box. , Can increase the freedom of layout design.

In addition, there is no need to hold both doors and inspection covers for entrance / exit like the doors and windows described in the other prior art. For example, the inspection cover is opened to maintain and inspect the outside air filter. For example, since it is not necessary for the operator to get in and out of the cab, the door for getting on and off can be closed, and the door and the inspection cover interfere with each other by opening only the inspection cover. The situation can be prevented. In addition, since the inspection cover in this case opens and closes the inspection opening such as the outside air filter, the inspection cover can be formed to be significantly smaller than the door for getting on and off, and the weight can be reduced. For example, the inspection cover can be sufficiently supported by using only one set of hinges, and the operability when the cover is opened and closed can be kept good.
In this case, the door that opens and closes the entrance / exit of the cab box is configured to be attached to the cab box using a plurality of hinges spaced apart from each other in the upper and lower directions of the door, and is located on the lower side of the plurality of hinges. Since the hinge for the inspection cover is also used as a hinge, for example, an inspection cover that is significantly smaller and lighter than a boarding door can be used. Thus, the inspection cover can be opened and closed satisfactorily.

  Further, according to the invention described in claim 2, a pillar extending upward and downward is provided at an intermediate portion in the front and rear directions of the cab box, and an entrance is provided on the front side of the pillar, and on the rear side thereof. An inspection opening is provided, and the pillar is provided with a door that opens and closes the entrance / exit by using a hinge and an inspection cover that opens and closes the inspection opening, so the common provided in the pillar of the cab box With this hinge, the entrance door can be supported to be opened and closed on the front side of the pillar, and the inspection cover can be supported to be opened and closed on the rear side of the pillar.

Furthermore, the invention according to claim 3 is a simple example in which a hinge shared by the inspection cover and the door is connected to the first to third hinge plates and the first to third hinge plates so as to be rotatable. The first hinge plate of the first to third hinge plates is attached to the cab box, the second hinge plate is attached to the door, and the third hinge plate is attached to the door. By attaching to the cab box, the door for getting on and off and the inspection cover can be pivotably supported (opened / closed) with respect to the cab box, and the pivot point at this time is constituted by a single hinge shaft. can do.

  Hereinafter, a construction machine cab according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings, taking as an example a case where it is applied to a hydraulic excavator.

  Here, FIG. 1 to FIG. 8 show a first embodiment of the present invention. In the figure, reference numeral 1 denotes a hydraulic excavator as a construction machine. The hydraulic excavator 1 is mounted on a crawler type lower traveling body 2 capable of self-propelling as shown in FIG. The upper revolving body 3 and a work device 7 to be described later are roughly configured.

  The upper revolving structure 3 of the excavator 1 has a revolving frame 4 that constitutes a frame of a construction machine. The revolving frame 4 is located on the revolving frame 4 on the rear side of the cab 10 and the cab 10 described later. A building cover 5 that houses a hydraulic pump (not shown) and the like, and a counterweight 6 that is located on the rear side of the building cover 5 are provided.

  7 is a working device provided at the front part of the upper swing body 3, and the working device 7 is provided at the center of the front part of the swivel frame 4 so as to be able to move up and down. For example, excavation work such as earth and sand using a bucket 7A or the like. Is to do.

  Reference numeral 10 denotes a cab provided on the revolving frame 4 for defining a cab. The cab 10 includes a cab box 11 and a door 21 which will be described later, a floor plate 22 which will be described later and covers the cab box 11 from below. It is comprised by. Inside the cab 10, a driver's seat 23, operation lever devices 24 and 25, an air conditioner 26, and the like, which will be described later, are provided.

  Reference numeral 11 denotes a cab box that forms an outer shell of the cab 10, and the cab box 11 is formed in a box-shaped box structure as shown in FIGS. 2 and 3, and includes an upper surface portion 12 that covers the upper side, and a front surface on the front side. Part 13, rear rear part 14, and side parts 15 and 16 located on the left and right sides.

  Here, of the side surface portions 15 and 16 of the cab box 11, one side surface portion 15 located on the left side when viewed from the rear of the vehicle is related to the left and right directions of the upper swing body 3 (vehicle body) as shown in FIG. 1. Located on the side opposite to the working device 7, the side surface 15 is provided with a door 21 for an operator to get in and out of the cab 10 as described later.

  The side surface portion 15 is formed by, for example, spot welding or the like using two panels 15A and 15B (hereinafter referred to as an outer panel 15A and an inner panel 15B) made of thin steel plates as shown in FIGS. It is configured as a hollow structure by joining together by means.

  Further, as shown in FIG. 3, a front pillar 17 and a rear pillar 18 are provided on the side surface portion 15 of the cab box 11 so as to be separated from each other, and between the front pillar 17 and the rear pillar 18, which will be described later. A center pillar 20 is provided. An entrance / exit 19 serving as a door opening is formed between the front pillar 17 and the center pillar 20 on the side surface 15 of the cab box 11. The entrance / exit 19 is formed by a door 21 described later. It will be opened and closed.

  On the other hand, between the rear pillar 18 and the center pillar 20, a window glass 15C forming a part of the side surface portion 15 is attached as shown in FIGS. Further, an inspection opening 32, an inspection cover 33 and the like which will be described later are provided on the side surface portion 15 of the cab box 11 at a position below the window glass 15C as shown in FIG.

  The other side surface portion 16 located on the right side of the cab box 11 is also configured as a hollow structure by joining two panels or the like to each other in substantially the same manner as the left side surface portion 15.

  Reference numeral 20 denotes a center pillar which is an intermediate pillar provided on the side surface portion 15 of the cab box 11, and the center pillar 20 has a hollow structure between the outer panel 15A and the inner panel 15B as shown in FIGS. The rear position of the entrance 19 is extended upward and downward. As shown in FIGS. 3 and 4, the center pillar 20 is formed with a hinge mounting portion 20A having a substantially L-shaped cross section, and hinges 36 and 37 (described later) are bolts, It is attached by means such as welding.

  That is, the center pillar 20 extends upward and downward to an intermediate portion in the front and rear directions of the cab box 11 (side surface portion 15), the front side of the pillar 20 serves as an entrance / exit 19, and the rear side of the pillar 20 is described later. An inspection opening 32 is provided. And the door 21 and the inspection cover 33 are each attached to the hinge attachment part 20A of the pillar 20 so that opening and closing is possible by the hinge 37 mentioned later.

  21 is a door for getting on and off provided on the side surface portion 15 of the cab box 11, and the door 21 includes a door frame 21A formed by joining two metal panels and the like as shown in FIG. It is comprised by the window glass 21B for doors 21 attached inside 21A of this door frame.

  The door 21 is pivotally attached to the center pillar 20 using hinges 36 and 37, which will be described later, and the door frame 21A has a rear end surface portion, and the entrance / exit 19 of the cab box 11 is opened when the operator gets on / off. Open and close. Further, a door lock device (not shown) for holding the door 21 in a closed state is provided between the front side of the door frame 21 </ b> A and the front pillar 17.

  Reference numeral 22 denotes a floor board constituting a part of the cab 10, and the floor board 22 is attached to the lower end of the front face portion 13, the rear face portion 14 and the left and right side face portions 15 and 16 of the cab box 11, as shown in FIG. The cab box 11 is covered from below. And the floor board 22 provides a scaffold (floor surface) to the operator who got in the cab 10. FIG.

  A driver's seat 23 is provided in the cab box 11 and is provided on the floor plate 22. The driver's seat 23 is arranged at a substantially central portion in the cab 10 as shown in FIG. is there. Further, operation lever devices 24 and 25 are provided on both the left and right sides of the driver's seat 23. These operation lever devices 24 and 25 include operation levers 24A and 25A for controlling the operation of the work device 7 and the like, for example. Etc. are provided.

  26 is an air conditioner provided in the cab box 11 on the rear side of the driver's seat 23. The air conditioner 26 includes an air conditioning evaporator and a heating heater core (both shown in FIG. 3). (Not shown) and the like, a blower 28 for circulating air in the unit case 27, an intake duct 29 connected to the suction side of the blower 28, and a front end side of the intake duct 29 And a filter case 30 to which an outside air filter 31 described later is detachably attached.

  Here, as shown in FIG. 4, the filter case 30 is fixed to the inner panel 15 </ b> B of the side surface portion 15 around the filter mounting hole 32 </ b> B, which will be described later, by means of welding or the like, and the other side of the filter case 30 is It is connected to the inflow side (front end side) of the intake duct 29. The air blower 28 of the air conditioner 26 distributes the air sucked from the intake duct 29 to the evaporator or the heater core in the unit case 27, and the conditioned air consisting of cold air or warm air is blown out from the air outlet 27A of the unit case 27 (see FIG. 3). ) And the like toward the cab 10.

  Reference numeral 31 denotes an outside air filter that is detachably provided in the filter case 30. The outside air filter 31 is inserted into the filter case 30 through a filter mounting hole 32B, which will be described later, as shown in FIG. The air is circulated in the direction indicated by the arrow A into the intake duct 29 in a state where the dust is removed (the dust in the outside air is removed).

  In this case, the outside air filter 31 is provided with locking claws 31 </ b> A and 31 </ b> A that are bifurcated on both left and right sides. The outside air filter 31 is mounted in the filter case 30 in a retaining state by hooking these locking claws 31A to the peripheral wall of the filter mounting hole 32B as shown in FIG.

  On the other hand, when the outside air filter 31 is taken out from the filter case 30, the operator's fingertip or the like is inserted into the inspection opening 32 described later with the inspection cover 33 described later opened widely in the direction indicated by the arrow B. The claw 31A is gripped and the latching claw 31A is released from being latched to the filter mounting hole 32B. As a result, the outside air filter 31 is detached from the filter case 30 and the filter mounting hole 32B and taken out in the direction indicated by the arrow C, and then maintenance, inspection, replacement work, and the like of the outside air filter 31 are performed.

  Reference numeral 32 denotes an inspection opening provided in the side surface portion 15 of the cab box 11. The inspection opening 32 is formed on the outer panel 15A of the side surface portion 15 so as to be positioned on the rear side of the center pillar 20 as shown in FIG. An inspection hole 32A extending in a substantially rectangular shape in the front and rear directions, and a square hole formed on the inner panel 15B of the side surface portion 15 so as to be located inside the inspection hole 32A and having a size smaller than the inspection hole 32A. And a filter mounting hole 32B.

  The filter mounting hole 32B constitutes one side opening of the filter case 30 as shown in FIG. 4, and each locking claw 31A of the outside air filter 31 is detachably attached to the peripheral wall (inner panel 15B) as described above. It is to be hung. Further, the inspection hole 32A of the inspection opening 32 is disposed at a position on the rear side of the side surface portion 15 and below the window glass 15C as shown by a dotted line in FIG. It is what is done.

  An inspection cover 33 is provided on the side surface portion 15 of the cab box 11 so as to be openable and closable so as to cover the inspection opening 32 from the outside. The inspection cover 33 is arranged on one side in the length direction (front side) as shown in FIG. ), Which will be described later, is attached, and is opened and closed in the direction indicated by the arrow B with the hinge 37 as a pivot point. Then, on the front side of the inspection cover 33, a screw seat 33A for attaching the hinge 37 is provided as shown in FIGS.

  Further, as shown in FIG. 2, the inspection cover 33 is formed with a plurality of outside air intake holes 33B, 33B,... Which are elongated in the upward and downward directions, and these outside air intake holes 33B are formed as shown in FIG. As shown in FIG. 4, it is disposed at a position offset to the front side of the outside air filter 31. These outside air intake holes 33B allow the outside air to circulate in the direction of the arrows A1 and A1 in FIG.

  Reference numeral 34 denotes a locking device provided on the rear side of the inspection cover 33. The locking device 34 engages the locking claw 34A with the stopper 35 shown in FIG. It locks in the closed state. In this case, the stopper 35 is fixed to the outer panel 15A of the side surface portion 15 by means such as welding.

  When opening the inspection cover 33, the operator inserts a key (not shown) into the key groove of the lock device 34, and rotates the lock claw 34A around the axis OO shown in FIG. The engagement of the lock claw 34A with respect to is released, and the inspection cover 33 can be opened in the direction indicated by the arrow B in FIG. When maintenance and inspection of the outside air filter 31 and the like are performed, the inspection opening 33 of the side surface portion 15 is opened to the outside by opening the inspection cover 33 widely, and a space for maintenance and inspection is secured. .

  Reference numerals 36 and 37 denote two sets of hinges or the like which are connected to the center pillar 20 of the side surface portion 15 so as to be opened and closed. The hinges 36 and 37 are connected to the center pillar 20 of the side surface portion 15 as shown in FIG. The door 21 is attached to the door frame 21A so as to be spaced apart upward and downward, and supports the door 21 so that it can be opened and closed.

  Here, the hinge 37 positioned on the lower side of the two sets of hinges 36 and 37 is shared by the door 21 and the inspection cover 33 as shown in FIGS. 4 and 6, and serves as both hinges. . The hinge 37 includes three hinge plates 37A, 37B, and 37C and a single hinge shaft 37D that rotatably connects these hinge plates 37A to 37C as shown in FIGS. ing.

  Of these hinge plates 37A to 37C, the first hinge plate 37A is attached to the hinge attachment portion 20A of the center pillar 20 using a plurality of bolts 38 and the like as shown in FIG. 37B is attached to the rear end surface portion of the door frame 21A using a bolt 39 or the like. Further, as shown in FIGS. 6 to 8, the third hinge plate 37 </ b> C is bent at an intermediate portion in a substantially square shape and attached to the screw seat 33 </ b> A of the inspection cover 33 using a bolt 40 or the like.

  As a result, the door 21 is opened and closed in the direction of arrow D in FIG. 6 together with the hinge plate 37B with the hinge shaft 37D as a rotation fulcrum, and the inspection cover 33 along with the hinge plate 37C and the hinge shaft 37D as a rotation fulcrum. Opened and closed in the direction of arrow B. The hinge 36 located on the upper side of the hinges 36 and 37 is dedicated to the door 21 as shown in FIG. 2, and is a normal hinge (for example, a hinge comprising two hinge plates and a hinge shaft). It is comprised by.

  Reference numeral 41 denotes a door catcher that holds the door 21 in the fully open position. The door catcher 41 is provided on the side surface portion 15 of the cab box 11 at the rear side of the center pillar 20 as shown in FIG. The side surface 15 is below the window glass 15C and above the inspection cover 33.

  Reference numeral 42 denotes a hook that protrudes outward from the door 21. The hook 42 is positioned below the window glass 21B of the door 21 and is attached to the door frame 21A as shown in FIG. It is hooked so as to be detachable. That is, when the door 21 is greatly opened in the direction of arrow D shown in FIG. 6 and the door 21 is fully opened, the hook 42 is hooked on the door catcher 41, and the door 21 is held fully open. .

  The hydraulic excavator 1 according to the present embodiment has the above-described configuration. Next, the operation thereof will be described.

  First, at a work site or the like, an operator operates the operation lever for traveling in the cab 10 to operate, for example, the lower traveling body 2 to move the vehicle forward and backward. Then, during excavation work such as earth and sand, the operation levers 24A, 25A and the like shown in FIG. 3 are tilted to operate the work device 7 and the upper swing body 3 is swung.

  In addition, the cab 10 of the hydraulic excavator 1 is normally held in a state where the door 21 is closed when the operator is not getting on or off. However, depending on the preference of the operator, excavation work or the like may be performed with the entrance 19 provided on the side surface 15 of the cab box 11 being opened by the door 21.

  In this case, the door 21 shown in FIG. 2 is greatly opened and the hook 42 is hooked on the door catcher 41 so that the door 21 can be held in the fully open state. Excavation work such as earth and sand can be performed in a state where air permeability is ensured.

  On the other hand, when excavation work or the like is performed with the door 21 closed, the temperature in the cab 10 can be adjusted to an appropriate temperature according to the preference of the operator by operating the air conditioner 26 in the cab 10. In this case, due to the suction of air by the blower 28, the outside air is sucked into the intake duct 29 through the outside air filter 31 in the filter case 30, and the air purified by the outside air filter 31 is the evaporator or the inside of the unit case 27. Distributes heater cores.

  At this time, the air flowing in the unit case 27 is cooled by an evaporator or heated by a heater core to become conditioned air composed of cold air or warm air, and the air outlet 27A of the unit case 27 (see FIG. 3). Or the like from the inside of the cab 10. Thereby, the temperature in the cab 10 can be adjusted to an appropriate temperature according to the preference of the operator, and the comfort in the cab 10 can be enhanced.

  However, in the work site of the hydraulic excavator 1, dust such as fine sand particles and dust continues to scatter in the surroundings, and the dust at this time is directed toward the outside air filter 31 from the outside air intake hole 33 </ b> B of the inspection cover 33, for example. Along with the outside air, the air is sucked in the direction of arrow A1 in FIG. For this reason, a large amount of dust adheres to the outside air filter 31 and is likely to be clogged.

  Therefore, at the time of maintenance work such as maintenance and inspection of the outside air filter 31, the inspection cover 33 is greatly opened in the direction indicated by the arrow B in FIG. 4 with the hinge shaft 37D of the hinge 37 as a fulcrum, and the inspection opening 32 of the side surface portion 15 is opened. Open to the outside. Then, in this state, the operator's fingertip or the like is inserted into the inspection opening 32 to grip each locking claw 31A, and by releasing the locking claw 31A from the filter mounting hole 32B, the outside air filter 31 is removed. The filter case 30 and the filter mounting hole 32B can be taken out in the direction of arrow C.

  In this state, the outside air filter 31 is maintained and inspected. For example, the outside air filter 31 can be easily replaced by replacing it with a new or washed outside air filter 31. After that, the inspection cover is covered. By closing 33, the inspection opening 32 of the side surface portion 15 can be covered with the inspection cover 33 from the outside.

  Thus, according to the present embodiment, the door 37 is connected to the center pillar 20 of the side surface portion 15 so as to be openable and closable. The inspection cover 33 is shared, and the hinge 37 is also used for both.

  That is, the hinge 37 in this case is composed of three hinge plates 37A, 37B, and 37C and a single hinge shaft 37D that rotatably connects the hinge plates 37A to 37C as shown in FIGS. It is composed. Then, of the hinge plates 37A to 37C, the first hinge plate 37A is attached to the hinge attachment portion 20A of the center pillar 20 using a bolt 38 or the like as shown in FIG. 6, and the second hinge plate 37B is attached to the door frame 21A. The third hinge plate 37C is attached to the screw seat 33A of the inspection cover 33 using the bolt 40 or the like.

  Thereby, the door 21 for getting on and off and the inspection cover 33 are supported with respect to the center pillar 20 provided on the side surface portion 15 of the cab box 11 so that they can be rotated (opened and closed) independently of each other using the hinges 37. The rotation fulcrum at this time can be constituted by a single hinge shaft 37D.

  The door 21 attached to the second hinge plate 37B and the third hinge plate 37C are attached by the first hinge plate 37A attached to the hinge attaching portion 20A of the center pillar 20 with a bolt 38 or the like. Since the inspection cover 33 is connected to the inspection cover 33 via the hinge shaft 37D so as to be openable and closable, the hinge plate 37A and the hinge shaft 37D of the hinge 37 can be used in common for the door 21 and the inspection cover 33. The workability at the time of assembly can be improved.

  In addition, by using the hinge 37 that is partially shared in this way, the door 21 for getting on and off and the inspection cover 33 are connected in an openable and closable manner, so that the center pillar 20 provided on the side surface portion 15 of the cab box 11 is connected to the center pillar 20. On the other hand, it is possible to easily secure a space for hinged connection between them, and to increase the degree of freedom in layout design.

  Moreover, there is no need to hold both the door 21 and the inspection cover 33 for getting on and off like the doors and windows described in the other prior art. That is, when the inspection cover 33 is opened and maintenance or inspection of the outside air filter 31 is performed, it is not necessary for the operator to get in and out of the cab 10, for example.

  For this reason, when performing maintenance, inspection, etc. of the outside air filter 31, the door 21 for getting on and off can be held in a closed state on one side surface portion 15 of the cab box 11, and by opening only the inspection cover 33, The situation where the door 21 and the inspection cover 33 interfere with each other can be prevented.

  In addition, the inspection cover 33 in this case only needs to be able to open and close the inspection opening 32 in order to carry out the replacement work and the like by putting the outside air filter 31 in and out of the cab 10. For this reason, the inspection cover 33 can be formed much smaller than the door 21 for getting on and off, and the weight can be reduced. As a result, the door 21 can be opened and closed, and the inspection cover 33 can be sufficiently supported by using only the lower hinge 37 of the lower pair of hinges 36 and 37. The inspection cover 33 can be opened and closed satisfactorily. can do.

  Therefore, according to the present embodiment, the inspection cover 33 for inspecting the outside air filter 31 and the like of the air conditioner 26 and the door 21 for getting on and off are connected using the common hinge 37, so that the two can be hinged. Can be easily secured, and the degree of freedom in designing the layout of the cab 10 can be increased. In addition, the inspection cover 33 such as the outside air filter 31 is significantly smaller and lighter than the door 21 for getting on and off, so that the inspection cover 33 is supported by a pair of hinges 37 so that it can be opened and closed. be able to.

  In the above embodiment, the cab box 11 is formed as an example of a substantially rectangular box shape including the upper surface portion 12, the front surface portion 13, the rear surface portion 14, and the left and right side surface portions 15 and 16. explained. However, the present invention is not limited to this. For example, the cab box may be formed in a substantially pentagonal or polygonal box shape, or may be a cab box having a substantially circular box structure.

  In the above-described embodiment, the case where the cab for construction machinery is applied to the cab 10 provided on the upper swing body 3 of the excavator 1 has been described as an example. However, the present invention is not limited to this, and may be applied to a cab for a construction machine such as a hydraulic crane or a wheel loader. Further, the present invention can also be applied to a type of construction machine cab provided with an upper turning body and a work device on a hull such as a dredger.

1 is an overall view showing a hydraulic excavator to which a cab according to an embodiment of the present invention is applied. It is a front view which expands and shows the cab in FIG. It is sectional drawing which looked at the cab from the arrow III-III direction in FIG. It is the expanded sectional view which looked at the one side part of the cab box from the arrow IV-IV direction in FIG. It is sectional drawing which looked at the locking device etc. of the inspection cover from the arrow VV direction in FIG. It is principal part sectional drawing which expands and shows the hinge etc. in FIG. It is a perspective view which shows the hinge in FIG. 6 as a single unit. It is a perspective view of the hinge seen from the direction different from FIG.

Explanation of symbols

1 Excavator (construction machine)
2 Lower traveling body 3 Upper revolving body 4 Revolving frame (frame)
7 Working device 10 Cab 11 Cab box 15 Side face 19 Entrance / exit 20 Center pillar (pillar)
20A Hinge mounting portion 21 Door 22 Floor plate 23 Driver's seat 26 Air conditioner 29 Air intake duct 30 Filter case 31 Outside air filter 32 Inspection opening 33 Inspection cover 36, 37 Hinge 37A First hinge plate 37B Second hinge plate 37C Third Hinge plate 37D Hinge shaft 38, 39, 40 Bolt 41 Door catcher 42 Hook

Claims (3)

A cab box with an entrance for the operator to enter and exit the side surface portion provided on the frame of the construction machine, a door rotatably provided on a side surface portion of the cab box to open and close the entrance, the side surface of the cab box A window glass provided on the rear side of the entrance and exit that forms part of the unit, and an air conditioner that supplies conditioned air into the room while taking outside air provided in the cab box ,
The door for opening and closing the entrance / exit is a cab for a construction machine that is attached to a side surface portion of the cab box using a plurality of hinges spaced apart from each other in the upper and lower directions of the door.
The said cab box, at the rear side of the entrance, and maintenance outside air filter of the air conditioner at a position which is a lower side of the window glass, the inspection opening for inspection, for opening and closing the inspection opening With an inspection cover ,
Among the plurality of hinges, an upper hinge is provided at a position where the window glass is provided and is used only for opening and closing the door, and a lower hinge is a position below the window glass. The inspection cover is configured to be attached to the side portion of the cab box so as to be pivotable by sharing the hinge located on the lower side as a pivot for the door. Machine cab.   The cab box is provided with a pillar extending upward and downward at an intermediate portion in the front and rear directions, the entrance is provided on the front side of the pillar, the inspection opening is provided on the rear side, and the pillar is provided on the pillar. The cab for construction machinery according to claim 1, wherein the cab is provided with the door that opens and closes the entrance and exit using the hinge and the inspection cover that opens and closes the inspection opening. The hinge shared by the inspection cover and the door includes a first hinge plate attached to the cab box, a second hinge plate attached to the door, and a third hinge plate attached to the inspection cover. The construction machine according to claim 1 or 2 , comprising a single hinge shaft that rotatably connects the second hinge plate and the third hinge plate to the first hinge plate. For cab.

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