JP4504283B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine such as a hydraulic excavator, and more particularly to a construction machine provided with a canopy that covers a driver's seat from above.

  In general, as construction machines such as a hydraulic excavator, a canopy-type construction machine in which a driver's seat is covered from above by a canopy and a cab-type construction machine in which a driver's seat is arranged in a cab are known.

  Here, a canopy-specific construction machine is often applied to a relatively small vehicle, for example, a small hydraulic excavator called a mini excavator. A small hydraulic excavator according to this type of prior art is provided with a self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and an upside-down movable structure at the front of the upper revolving body. And a working device.

  On the other hand, cab-specific construction machines are widely applied to vehicles ranging from small to large. For example, when using medium- or large-sized hydraulic excavators, the bucket of the working device is extended to a position higher than the cab. In some cases, cliffs are cut off.

  For this reason, in the prior art, a guard-like guard member is provided on the upper front side of the cab, and this guard member prevents falling objects such as earth and sand and stones from colliding with the front part of the cab (windshield, etc.). (For example, see Patent Documents 1 and 2).

JP-A-8-142785 JP 2001-58553 A

  By the way, in the conventional technology described above, for example, even when a canopy-type hydraulic excavator is used, there are cases where it is desired to perform various operations by extending the working device to a position higher than the upper surface of the canopy.

  However, in a small hydraulic excavator to which the canopy specification is applied, since the working device is also relatively small, it is often not assumed that the working device is extended to a high position. For this reason, in the prior art, the guard member is not provided in the hydraulic excavator of canopy specification, and there exists a problem that the operation content using a hydraulic excavator is restrict | limited.

  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 protect an operator seated in a driver's seat from falling objects even in a canopy specification vehicle, and to improve the operator's working environment. It is another object of the present invention to provide a construction machine that can be held at a high position and can smoothly perform work at a high position by a working device.

In order to solve the above-described problems, the present invention is a self-propelled lower traveling body, an upper revolving body that is turnably mounted on the lower traveling body, and a front-rearly movable upper and lower revolving body. The upper swing body includes a swing frame formed as a support structure, a driver seat provided on the swing frame and seated by an operator, and an operator provided on the front side of the driver seat. Is provided with a traveling lever / pedal that is operated when traveling, and a canopy provided on the swivel frame and having a top surface that covers the driver's seat from above, on the top surface of the canopy of an operator seated in the driver's seat It is applied to a construction machine provided with a ceiling window covered with a transparent plate material in order to secure an upper field of view .

A feature of the configuration adopted by the invention of claim 1 is that the canopy is seated in the driver's seat by projecting forward from the upper surface portion and covering the travel lever pedal and its vicinity from above . A guard for protecting the operator from falling objects is provided , and the guard is formed as a grid-like frame extending in the horizontal direction along the upper surface of the canopy, and is attached to the upper surface of the canopy at a position covering the ceiling window. A skylight protection portion, a frame provided on the front side of the skylight protection portion and projecting forward from the top to a position covering the traveling lever and pedal and its vicinity, and a horizontal direction provided on the frame And a protective plate made of a see-through material that secures the operator's field of view .

Moreover, according to invention of Claim 2 , it is set as the structure which provides a vibration proof member between the said frame and a protective plate.

According to a third aspect of the present invention, the frame is provided with a reinforcing stay having a quadrangular cross section, and the stay is one of four sides forming the cross section of the stay. Is inclined and arranged so as to face the driver's seat side.

According to the present invention may be provided with a guard which covers the protruding travel levers pedal and its vicinity in front from above the upper surface of the canopy. Thus, when working with construction machinery, even if fallen objects such as earth and sand and stone fall from the top of the canopy, this fallen object reaches the vicinity of the operator seated in the driver's seat, or travel lever pedal And it can prevent by a guard that it collides with the peripheral apparatus etc. of the vicinity position .

Therefore, for example, even when the work device is extended to a position higher than the canopy and various kinds of work are performed, the operator, the travel lever / pedal and peripheral devices in the vicinity thereof can be reliably protected from falling objects. The environment can be maintained well. For this reason, even in a canopy-type construction machine, work at a high position can be performed smoothly, and adaptability to various kinds of work can be improved.

Further, in this case, the guard is formed as a grid-like frame extending in the horizontal direction along the upper surface of the canopy and is attached to the upper surface of the canopy at a position covering the ceiling window, It can be formed by a frame provided on the front side of the skylight protection part and a protection plate made of a see-through material that secures the field of view of the operator . Thus, the frame body, such as high strength, it is possible to use a material having rigidity, because the protective plate can be used other lightweight materials, while suppressing the weight of the whole guard, to Sufficient strength can be given. Moreover, the ceiling window of the canopy can be covered by the skylight protection part of the guard, and the ceiling window can be protected from falling objects by this skylight protection part. Thereby, the skylight protection part which protects a ceiling window, and the bowl-shaped frame body which protrudes ahead of a canopy can be formed as one guard. As a result, the number of parts related to the guard can be reduced, so that the assembly work of the vehicle can be made efficient and the productivity can be increased. Moreover, the skylight protection part that covers the ceiling window can reinforce the bowl-shaped frame projecting forward of the canopy, and can support this bowl-shaped frame, increasing the strength of the entire guard, The state of attachment to the canopy can be stabilized.

  On the other hand, the protective plate can be formed of, for example, a material such as transparent resin or glass, or a lattice-like or mesh-like transparent material. Thereby, the operator seated in the driver's seat can confirm the surrounding situation by seeing through the protective plate projecting upward. Therefore, it is possible to avoid the operator's field of view from becoming narrow due to the guard, and the operator's field of view can be well secured even at the position of the guard.

Moreover, according to invention of Claim 2 , a frame can support a protective plate via vibration isolating members, such as rubber | gum, for example, and can stabilize the attachment state of a protective plate. As a result, it is possible to prevent rattling or the like from occurring on the protective plate due to vibrations transmitted from the vehicle body side, and vibration resistance can be improved.

According to the invention of claim 3 , the strength of the frame can be increased by the stay, and the durability of the guard can be improved. In this case, the four sides of the stay can be tilted so that one side forming the cross-sectional shape of the stay faces the driver's seat. This makes it possible to reduce the outline (projected area) of the stay as seen from the operator seated on the driver's seat as compared to, for example, the case where the stay sides are arranged vertically (or horizontally). For this reason, it is possible to avoid the stay from interfering with the operator's field of view as much as possible, and the field of view of the operator can be well maintained while securing the guard strength by the stay.

  Hereinafter, construction machines according to embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  Here, FIG. 1 to FIG. 8 show a first embodiment. In this embodiment, an offset hydraulic excavator having a three-post canopy will be described as an example of a construction machine.

  In the figure, reference numeral 1 denotes a canopy-type offset hydraulic excavator. The hydraulic excavator 1 includes a self-propelled crawler-type lower traveling body 2 and an upper revolving body 3 that is rotatably mounted on the lower traveling body 2. And an offset type working device 4 provided so as to be able to move up and down at an intermediate position between the left and right on the front side of the upper swing body 3.

  Here, as shown in FIG. 2, the upper swing body 3 is formed in a substantially circular shape when viewed from above so as to be able to turn substantially within the vehicle width of the lower traveling body 2. It comprises a counterweight 8, a driver's seat 9, a canopy 12, a guard 14, and the like.

  Further, as shown in FIG. 1, the working device 4 includes a lower boom 4A supported by the revolving frame 5 so as to be able to be lifted and lowered, and an upper boom 4B connected to the tip of the lower boom 4A so as to be swingable leftward and rightward. An arm support member 4C connected to the front end of the upper boom 4B so as to be swingable in the left and right directions; an arm 4D connected to the front end of the arm support member 4C so as to be rotatable upward and downward; A bucket 4E rotatably attached to the tip of 4D, a boom cylinder 4F, an arm cylinder 4G, and a bucket cylinder 4H are roughly configured.

  Further, a link 4J is provided between the tip of the lower boom 4A and the arm support member 4C to hold the arm 4D parallel to the lower boom 4A. Then, the work device 4 translates (offsets) the arm 4D in the left and right directions with respect to the lower boom 4A, and rotates the arm 4D and the bucket 4E while moving the lower boom 4A up and down in this state. Etc. can be excavated.

  Reference numeral 5 denotes a revolving frame constituting the lower side of the upper revolving structure 3, and the revolving frame 5 is formed as a support structure by, for example, a plurality of steel materials, steel plates and the like. A floor member 6 is provided on the left side of the front portion of the revolving frame 5, and a driver's seat 9, a canopy 12, and the like described later are provided on the floor member 6.

  Further, devices (not shown) such as an engine and a hydraulic pump and an exterior cover 7 that covers these devices are provided on the rear side of the turning frame 5. A counterweight 8 that balances the weight of the working device 4 is attached to the rear end side of the revolving frame 5.

  Reference numeral 9 denotes a driver's seat provided on the left side of the front portion of the turning frame 5, and the driver's seat 9 is seated by an operator. As shown in FIG. 3, a traveling lever / pedal 10 is provided on the front side of the driver's seat 9 so that the vehicle travels when operated by the operator. A work lever 11 (only one of them is shown) for performing the operation 4 is provided.

  Reference numeral 12 denotes a three-post canopy provided on the left side of the front portion of the revolving frame 5, and this canopy 12 is arranged on the left side of the lower boom 4 </ b> A of the work device 4 and is seated on the driver's seat 9 as shown in FIG. 2. The operator is covered from above and from the right side.

  Here, as shown in FIGS. 3 and 8, the canopy 12 includes a right front pillar 12 </ b> A standing on the right front side of the driver seat 9, a right rear pillar 12 </ b> B standing on the right rear side of the driver seat 9, The left rear pillar 12C erected on the left rear side of the driver's seat 9, a right ceiling pillar 12D, a left ceiling pillar 12E, a front ceiling pillar 12F, a rear ceiling pillar 12G, and an upper surface portion 12H are roughly configured.

  The right ceiling pillar 12D connects the right front pillar 12A and the right rear pillar 12B on the upper end side, and these portions are formed by bending a metal pipe or the like. Further, the left ceiling pillar 12E is bent and extended forward from the upper end side of the left rear pillar 12C, and these portions are also formed by metal pipes.

  The front ceiling pillar 12F connects the right ceiling pillar 12D and the left ceiling pillar 12E on the front side, and extends in the left and right directions. Further, the rear ceiling pillar 12G connects the right rear pillar 12B and the left rear pillar 12C on the upper end side.

  On the other hand, the upper surface portion 12H is formed of, for example, a metal plate having a curved rear side, and is disposed at a position that covers the operator seated on the driver's seat 9 from above, and the peripheral portion of the upper surface portion 12H has a right ceiling pillar 12D. The left ceiling pillar 12E, the front ceiling pillar 12F, and the rear ceiling pillar 12G are respectively joined.

  A ceiling window 13 is provided on the upper surface portion 12H of the canopy 12, and the ceiling window 13 is covered with a transparent plate material such as a glass plate or a resin plate. Here, the ceiling window 13 secures an upper field of view of the operator seated on the driver's seat 9, and for example, when the lower boom 4 </ b> A of the work device 4 is greatly lifted to a position near vertical, the position of the driver's seat 9 is The bucket 4E and the like are easily confirmed.

  Next, reference numeral 14 denotes a guard provided on the upper surface portion 12H of the canopy 12. The guard 14 protects the operator sitting on the driver's seat 9 and its peripheral devices from falling objects when the work device 4 is lifted to a position higher than the canopy 12, for example. The guard 14 is configured to protect the ceiling window 13 of the canopy 12 from falling objects.

  Here, as shown in FIGS. 3 to 5, the guard 14 is roughly constituted by a skylight protection portion 15, a frame body 16, and a protection plate 17, which will be described later, and projects to the front of the canopy 12 and components for protecting the ceiling window 13. It has a structure that integrates a bowl-shaped part.

  The guard 14 is attached to the upper surface portion 12H side of the canopy 12 by means such as screwing, for example, and protrudes forward from the position covering the ceiling window 13 to the upper surface portion 12H. In this state, the protruding end side of the guard 14 covers the front side position of the operator (traveling lever / pedal 10 and its vicinity) seated on the driver's seat 9 from above.

  Reference numeral 15 denotes a skylight protection portion that constitutes a skeleton portion of the guard 14 together with the frame body 16. The skylight protection portion 15 is formed in a flat lattice shape by joining a plurality of elongated steel materials, for example, as shown in FIG. It is formed as a frame and extends in the horizontal direction along the upper surface portion 12H of the canopy 12.

  The skylight protection portion 15 is attached to the upper surface portion 12H side of the canopy 12 at a position covering the ceiling window 13, and has a function as a guard member that prevents falling objects from colliding with the ceiling window 13. The skylight protection unit 15 also has a function as a support member that supports the frame body 16, the protection plate 17, and the like.

  The skylight protection portion 15 is formed by extending a plurality of vertical beam portions 15A extending in the front and rear directions at intervals in the left and right directions, and extending in the left and right directions between the vertical beam portions 15A. A horizontal beam portion 15B that connects the longitudinal intermediate portions of the vertical beam portion 15A to each other, and an upper surface portion 12H of the canopy 12 that is fixed to the rear side of each vertical beam portion 15A and extends to the left and right, and is screwed or the like. It is comprised by the attachment beam part 15C attached to the side.

  Reference numeral 16 denotes a frame that is fixedly provided on the front side of the skylight protection unit 15, and the frame 16 serves as an attachment site for the protection plate 17, and the front end (front ceiling pillar) of the upper surface portion 12 </ b> H of the canopy 12. 12F), and extends horizontally in the front, rear, left, and right directions at this position.

  As shown in FIG. 5, the frame body 16 is positioned on the front side thereof and extends to the left and right, and the rear frame 16A is positioned on the rear side of the front frame 16A and extends to the left and right. The frame 16B, the front frame 16A and the rear frame 16B are connected at the left end side, the left frame 16C extending in the front and rear directions, and the front frame 16A and the rear frame 16B are connected at the right end side in the front and rear directions. A right frame 16D that extends, a left protective plate holding portion 16E that is fixed on the left frame 16C and extends front and rear, a right protective plate holding portion 16F that is fixed on the right frame 16D and extends front and rear, Between the left frame 16C and the right frame 16D, they are arranged at intervals in the left and right directions, and are roughly constituted by a plurality of connecting beams 16G that extend in the front and rear directions and connect the front frame 16A and the rear frame 16B. ing.

  Here, as shown in FIG. 2, the left frame 16 </ b> C is provided with an attachment portion 16 </ b> H that is attached to the left ceiling pillar 12 </ b> E of the canopy 12. Further, as shown in FIG. 3, a leg portion 16J extending downward is provided on the front side of the right frame 16D. The leg portion 16J is attached to the right front pillar 12A of the canopy 12, and the front side of the frame body 16 is provided. Support. Further, the left and right protection plate holding portions 16E and 16F are configured so as to have a substantially U-shaped cross section as shown in FIG. 6 and hold the periphery of the protection plate 17 fitted inside thereof. Yes.

  Reference numeral 17 denotes a flat protective plate provided on the frame body 16. The protective plate 17 covers the front position (travel lever / pedal 10 and its vicinity) of the operator seated on the driver's seat 9 from above. In addition to protecting the operator, the travel lever / pedal 10 and the like from falling objects, they also have a function as a rain shield that shields them from rain water and the like.

  Here, as shown in FIG. 3, the protective plate 17 is formed of a material that can be seen through the upper side of the protective plate 17 when the operator sitting on the driver's seat 9 looks up at the protective plate 17. It is configured to ensure visibility. In this case, as a transparent material for forming the protective plate 17, for example, a transparent resin material such as polycarbonate, tempered glass, or the like is used. Further, the transparent material does not necessarily need to be a transparent material, and for example, a lattice-like or mesh-like transparent material may be used.

  Further, as shown in FIGS. 4 and 6, the protection plate 17 is a frame body using mounting bolts 18, cap nuts 19, washers 20, which will be described later, and vibration-proof rubbers 21 which will be described later. 16 are attached to the front frame 16A and the rear frame 16B and extend in the horizontal direction. Further, the left and right peripheral portions of the protection plate 17 are fitted into protection plate holding portions 16E and 16F of the frame body 16, respectively.

  Reference numeral 21 denotes an anti-vibration rubber as an anti-vibration member provided between the frame 16 and the protective plate 17 at the position of each mounting bolt 18. These anti-vibration rubbers 21 are constituted by rubber washers or the like, for example, and elastically support the protection plate 17 while being sandwiched between the washer 20 and the protection plate 17. As a result, the anti-vibration rubber 21 prevents the shading of the protective plate 17 due to vibrations on the vehicle body side and the like, and improves vibration resistance.

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

  First, the operator can sit on the driver's seat 9 and operate the traveling lever / pedal 10 in this state to cause the lower traveling body 2 to travel. Further, by operating the work lever 11, the upper turning body 3 can be turned, or the work device 4 can be moved up and down to perform excavation work of earth and sand.

  At this time, the excavator 1 may take a posture (small turning posture) such that the working device 4 is within the turning radius by folding the working device 4 and raising the working device 4 to a position close to vertical. In this state, the operator can easily confirm the state of the bucket 4E and the like located above the canopy 12 from the ceiling window 13.

  Further, for example, even when earth and sand, stones, or the like accommodated in the bucket 4E spills down toward the ceiling window 13 below, the fallen objects collide with the ceiling window 13 by the skylight protection unit 15 of the guard 14. can do.

  On the other hand, at the time of excavation work using the hydraulic excavator 1, the work device 4 is extended to a position higher than the upper surface portion 12H of the canopy 12, as described in, for example, Japanese Patent Application Laid-Open No. 8-142785. There is a case that the cutting work such as. During such work, falling objects such as earth and sand and stone may fall from the upper side of the canopy 12 to the front side.

  However, since the protective plate 17 of the guard 14 protrudes in front of the upper surface portion 12H of the canopy 12, it prevents the fallen object from colliding with an operator seated in the driver's seat 9 and equipment such as the traveling lever / pedal 10. can do. In addition, the operator can smoothly proceed with the work while confirming the state of the excavation site through the protective plate 17 in this state.

  Thus, according to the present embodiment, since the guard 14 protruding forward is provided on the upper surface portion 12H side of the canopy 12, when the hydraulic excavator 1 is used, for example, falling objects such as earth and sand, stones, etc. Even if it falls from above the canopy 12, the guard 14 can prevent the fallen object from reaching the vicinity of the operator seated on the driver's seat 9 or colliding with, for example, the travel lever / pedal 10 or the like. it can.

  Therefore, for example, even when the work device 4 is extended to a position higher than the canopy 12 and various kinds of work are performed, the operator and its peripheral devices can be reliably protected from falling objects, and the work environment of the operator is favorably maintained. be able to. For this reason, even in the canopy-type hydraulic excavator 1, work at a high position can be performed smoothly, and adaptability to various kinds of work can be improved.

  In this case, since the guard 14 is formed by the skylight protection portion 15, the frame body 16, and the protection plate 17, for example, a steel material having high strength and rigidity can be used for the skylight protection portion 15 and the frame body 16. In addition, a lightweight material such as a resin material can be used for the protective plate 17. Therefore, even if the guard 14 having a large area is formed, it is possible to give sufficient strength to the guard 14 while suppressing the weight of the entire guard 14.

  In addition, since the protective plate 17 is formed of a material such as a transparent resin plate or glass, an operator seated on the driver's seat 9 can check the surrounding situation by seeing through the guard 14 projecting upward. it can. Accordingly, it is possible to prevent the operator's field of view from becoming narrow due to the guard 14 being obstructed, and the operator's field of view can be well secured even at the position of the guard 14. In addition, by forming the protective plate 17 with a plate material, the guard 14 can also have a function as a rain guard, and workability can be improved during work in the rain.

  On the other hand, since the anti-vibration rubber 21 is provided between the frame 16 and the protective plate 17, the frame 16 can support the protective plate 17 via the anti-vibration rubber 21, and the attachment state of the protective plate 17. Can be stabilized. As a result, it is possible to prevent rattling or the like from occurring on the protective plate 17 due to vibrations transmitted from the vehicle body side, and vibration resistance can be improved.

  Moreover, since the ceiling window 13 of the canopy 12 is covered by the skylight protection section 15 of the guard 14, the ceiling window 13 can be protected from falling objects by the skylight protection section 15. Thereby, the part which protects the ceiling window 13 and the bowl-shaped part which protrudes ahead of the canopy 12 can be formed as one guard 14, and the number of parts related to the guard 14 can be reduced. This makes it possible to increase the productivity by increasing the efficiency of vehicle assembly work.

  Further, the skylight protection unit 15 can reinforce the frame body 16 protruding forward of the canopy 12 and can support the frame body 16, so that the strength of the entire guard 14 is increased and the attachment to the canopy 12 is performed. The state can be stabilized.

  Next, FIG. 9 to FIG. 12 show a second embodiment according to the present invention. The feature of this embodiment is that the guard is provided with an inclined stay to increase the strength while ensuring the operator's field of view. There is. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 31 denotes a guard provided on the upper surface portion of the canopy. As shown in FIGS. 9 to 11, the guard 31 is substantially the same as the first embodiment, and the skylight protection unit 15, the frame body 32, and the protection plate 17. It is roughly constituted by. The frame 32 has a front frame 32A, a rear frame 32B, a left frame 32C, a right frame 32D, protective plate holding portions 32E and 32F, a connecting beam 32G, a mounting portion 32H, and a leg portion 32J. A stay 33 described later is provided between the connecting beams 32G.

  Reference numeral 33 denotes a stay for reinforcement that constitutes a part of the frame body 32. As shown in FIGS. 10 and 12, the stay 33 is made of, for example, an elongated prismatic steel material or the like, and has a short cross-sectional shape. It is formed in a rectangular (quadrangle) shape having four sides composed of the sides 33A and 33A and the long sides 33B and 33B.

  The stay 33 extends leftward and rightward between the front frame 32A and the rear frame 32B, connects the connecting beams 32G to each other, and both ends in the length direction are fixed to the left frame 32C and the right frame 32D. Has been. As a result, the stay 33 forms a lattice-like support structure that supports the protection plate 17 together with the connecting beams 32G, and reinforces the front side of the guard 31.

  Further, as shown in FIGS. 11 and 12, the stay 33 is arranged with the four sides 33 </ b> A and 33 </ b> B inclined obliquely so that, for example, one short side 33 </ b> A faces the driver's seat 9. Specifically, when the operator seated in the driver's seat 9 looks up the protective plate 17 obliquely, if the direction A of the line of sight is inclined by an angle θ with respect to the vertical direction, the short side of the stay 33 33A is inclined toward the driver's seat 9 side by an angle θ with respect to the horizontal direction.

  In this state, the short side 33A of the stay 33 is arranged perpendicularly to the line-of-sight direction A, so that the contour of the stay 33 (projected area S in FIG. 12) can be minimized when viewed from the operator. It is possible to avoid 33 from interfering with the field of view as much as possible.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. In particular, in the present embodiment, the stay 33 is provided on the frame body 32 of the guard 31, so that the strength of the frame body 32 can be increased by the stay 33 and the durability of the guard 31 can be improved. it can.

  In this case, the stay 33 is arranged with the short side 33A and the long side 33B inclined obliquely so that one short side 33A faces the driver's seat 9 side. Accordingly, the outline of the stay (projection area S) can be reduced as viewed from the operator seated on the driver's seat 9 as compared with the case where the four sides of the stay 33 are arranged vertically (or horizontally), for example. Accordingly, the stay 33 can secure the strength of the guard 31 and can also maintain the operator's field of view.

  Next, FIGS. 13 to 15 show a third embodiment according to the present invention, and the feature of this embodiment is that a guard is applied to a four-post canopy. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  Reference numeral 41 denotes a canopy-type swing hydraulic excavator. The hydraulic excavator 41 is roughly constituted by a lower traveling body 42, an upper swing body 43, and a swing-type working device 44, as in the first embodiment. Yes. The upper swing body 43 includes a swing frame 45, a floor member 46, an exterior cover 47, a counterweight 48, a driver seat 49, and a four-column type canopy 50 described later.

  Here, the working device 44 includes a swing post 44A supported on the front side of the swing frame 45 so as to be swingable in the left and right directions, a boom 44B supported on the swing post 44A so as to be able to be lifted and lowered, An arm 44C rotatably connected to the tip of the boom 44B, a bucket 44D rotatably attached to the tip of the arm 44C, a boom cylinder 44E, an arm cylinder 44F, and a bucket cylinder 44G It is roughly constituted by.

  Then, the working device 44 swings (swings) the swing post 44A left and right with respect to the turning frame 45, and rotates the arm 44C and the bucket 44D while raising and lowering the boom 44B in this state. Excavation work such as gutters can be performed.

  Reference numeral 50 denotes a four-post canopy provided on the left side of the front portion of the turning frame 45. The canopy 50 covers the operator seated on the driver's seat 49 from above and from the right side as shown in FIGS. It is. Here, the canopy 50 is erected on the right front pillar 50A erected on the right front side of the driver seat 9, the right rear pillar 50B erected on the right rear side of the driver seat 9, and the left front side of the driver seat 9. The left front pillar 50C, the left rear pillar 50D erected on the left rear side of the driver's seat 9, the right ceiling pillar 50E, the left ceiling pillar 50F, the front ceiling pillar 50G, the rear ceiling pillar 50H, and the upper surface portion 50J. It is roughly structured.

  The right ceiling pillar 50E connects the right front pillar 50A and the right rear pillar 50B on the upper end side, and these portions are formed by bending, for example, one metal pipe or the like. The left ceiling pillar 50F connects the left front pillar 50C and the left rear pillar 50D on the upper end side, and these portions are also formed by a single metal pipe.

  The front ceiling pillar 50G connects the right ceiling pillar 50E and the left ceiling pillar 50F on the front side, and extends in the left and right directions. Further, the rear ceiling pillar 50H connects the right rear pillar 50B and the left rear pillar 50D on the upper end side.

  On the other hand, the upper surface portion 50J is formed of, for example, a metal plate having a curved rear side, and is disposed at a position that covers the operator seated on the driver's seat 9 from above, and the peripheral portion of the upper surface portion 50J is the right ceiling pillar 50E. The left ceiling pillar 50F, the front ceiling pillar 50G, and the rear ceiling pillar 50H are respectively joined. A guard 14 is attached to the upper surface 50J side of the canopy 50 in substantially the same manner as in the first embodiment.

  Thus, in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as those of the first embodiment. And especially in this Embodiment, since it was set as the structure which provides the guard 14 in the four-column type canopy 50, the application range of the guard 14 can be expanded.

  In each of the embodiments described above, as a material for forming the protective plate 17 of the guard 14, for example, a transparent resin material, tempered glass, or the like is used. However, the material for forming the protective plate 17 of the present invention is not limited to this, and any material that can be seen through may be, for example, a lattice-like or mesh-like transparent material.

  Further, in the embodiment, the hydraulic excavators 1 and 41 including the offset type or swing type work devices 4 and 44 are described as examples of the construction machine. However, the present invention is not limited to this, and can also be applied to a mono-boom hydraulic excavator including, for example, a standard working device (mono-boom working device) that does not perform an offset operation or a swing operation.

  Furthermore, in the embodiment, a hydraulic excavator 1 including a crawler type lower traveling body 2 is described as an example of a construction machine. However, the present invention is not limited to this, and can also be applied to other construction machines such as a hydraulic excavator provided with a wheel-type lower traveling body and a hydraulic crane.

1 is a front view showing an offset hydraulic excavator according to a first embodiment of the present invention. It is the top view which looked at the excavator of FIG. 1 from the upper side. It is an enlarged front view which expands and shows the 3 column type canopy, guard, etc. in FIG. It is a perspective view which shows a 3 column type canopy, a guard, etc. It is a top view which shows the guard in FIG. 4 alone. It is sectional drawing which looked at a part of guard from the arrow VI-VI direction in FIG. It is a disassembled perspective view which shows the state before attaching the frame and guard plate of a guard. It is a perspective view which shows a three-column type canopy alone. It is a top view which shows the guard of the hydraulic shovel by the 2nd Embodiment of this invention. It is a perspective view which shows the frame etc. of a guard in the state which removed the protective plate. FIG. 4 is an enlarged front view similar to FIG. 3, showing a positional relationship between a guard stay and a driver's seat. It is a principal part expanded sectional view which expands and shows the a part in FIG. It is a front view which shows the swing type hydraulic excavator by the 3rd Embodiment of this invention. It is a perspective view showing a four-column type canopy, a guard and the like. It is a perspective view which shows a four-column type canopy alone.

Explanation of symbols

1,41 Hydraulic excavator (Construction machine)
2,42 Lower traveling body 3,43 Upper revolving body 4,44 Working device 5,45 Turning frame 9,49 Driver's seat 12,50 Canopy 12A, 50A Right front pillar 12B, 50B Right rear pillar 12C, 50D Left rear pillar 12H, 50J Upper surface part 13 Ceiling window 14,31 Guard 15 Skylight protection part 16,32 Frame 17 Protection plate 18 Mounting bolt 21 Anti-vibration rubber (anti-vibration member)
33 Stay 33A Short side 33B Long side 50C Left front pillar

Claims (3)

A self-propelled lower traveling body, an upper revolving body mounted on the lower traveling body so as to be able to swivel, and a work device provided on the front of the upper revolving body so as to be able to move up and down,
The upper swing body includes a swing frame formed as a support structure, a driver seat provided on the swing frame and seated by an operator, and a travel lever pedal provided on the front side of the driver seat and operated by the operator during travel. And a canopy provided on the swivel frame and having an upper surface portion covering the driver's seat from above ,
In the construction machine in which the upper surface of the canopy is provided with a ceiling window covered with a transparent plate material in order to ensure an upward view of the operator seated in the driver's seat ,
The canopy is provided with a guard that protects the operator seated on the driver's seat from falling objects by projecting forward from the upper surface portion and covering the travel lever pedal and its vicinity from above .
The guard is formed as a grid-like frame extending in the horizontal direction along the upper surface of the canopy and is attached to the upper surface of the canopy at a position covering the ceiling window, and the front of the skylight protection A frame that is provided on the side and protrudes forward to a position that covers the traveling lever / pedal and its neighboring position from above, and that is provided on the frame and extends in the horizontal direction to ensure visibility of the operator construction machine, characterized in that have configured by a protective plate made of material. The construction machine according to claim 1 , wherein a vibration isolating member is provided between the frame body and the protective plate. The frame body is provided with a stay for reinforcement having a quadrilateral cross section, and the stay is slanted so that one of the four sides forming the cross section of the stay faces the driver's seat side. The construction machine according to claim 1 or 2 , wherein the construction machine is disposed at an angle to the top.

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