JPH11264153A - Cab for construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inhibit the vibrations of a cab body by a head guard, and to cover the relative movement of the head guard to the cap body at that time from the outside. SOLUTION: A movable guard 11 is installed to the top face section 8A of a cab body 8 through mount members 14 relatively movably while a fixing guard 23 covering the outside in the horizontal direction of the movable guard 11 is fixed. Accordingly, since the movable guard 11 inhibits the vibrations of the cab body 8, the movement of the movable guard 11 can be covered from the outside by the fixing guard 23 even when the movable guard 11 is moved relatively to the cab body 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cab for a construction machine suitable for use in a construction machine such as a hydraulic shovel and a hydraulic crane.

[0002]

2. Description of the Related Art Generally, construction machines such as hydraulic excavators are
The vehicle includes a lower traveling structure, an upper revolving structure rotatably mounted on the lower traveling structure, and a working device provided on the upper revolving structure so as to be capable of raising and lowering. Cab is provided.

[0003] The cab of the construction machine as described above is
Normally, it is mounted on a revolving frame that constitutes the upper revolving structure using an anti-vibration mount, etc., and the vibration generated during traveling or excavation work is suppressed from being transmitted to the cab via the revolving frame by the anti-vibration mount, The comfort of the driver's cab and the operability of the operation lever and the like are improved.

[0004] For example, Japanese Utility Model Laid-Open No. 6-67557 discloses a cab body defining a cab, and a head guard provided above the cab body to protect the cab body from falling objects. A cab for a construction machine is disclosed.

In the cab for a construction machine according to the prior art as described above, a head guard is provided on a cab body by a mount member made of an elastic material such as rubber so as to be relatively movable, and the cab is provided by the mount member and the head guard. A dynamic vibration absorber that suppresses vibration of the main body is configured. When the cab body vibrates during an excavation operation or the like, the vibration energy of the cab body is transmitted to the head guard. For example, the cab body and the head guard vibrate in opposite directions, thereby reducing the vibration of the cab body. It is configured to suppress.

[0006]

However, when the head guard is used as the mass of the dynamic vibration absorber as in the above-mentioned prior art, the head guard is moved forward, backward or left or right by the vibration of the cab body. To move right,
The relative movement of the head guard with respect to the cab body is visually observed from the outside of the excavator, giving an impression that the head guard is attached to the cab body in an unstable state, thereby impairing the reliability of the cab. There is a problem.

In the cab according to the prior art described above, the mount member for supporting the head guard on the cab body is formed of an elastic body made of rubber or the like.
For this reason, when a falling object such as a falling rock collides with the head guard, the rigidity of the mounting member in the upper and lower directions is insufficient, and the head guard is largely displaced downward and interferes with the cab body. is there.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention can suppress the vibration of the cab body by the head guard and can cover the relative movement of the head guard at this time from the outside. It is an object to provide such a cab for construction machinery.

Another object of the present invention is to support the head guard on the cab body by using a mount member having high rigidity in the upward and downward directions, thereby reliably protecting the cab body from falling objects such as falling rocks. It is an object of the present invention to provide a cab for construction equipment which can be used.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a cab body defining a cab of a construction machine, and an upper side of the cab body for protecting the cab body from falling objects. And a head guard provided in the cab.

According to a first aspect of the present invention, the head guard includes a movable guard disposed on the cab body,
A mount member provided between the movable guard and the cab body for supporting the movable guard so as to be relatively movable; and a horizontal member of the movable guard for covering the movable guard relatively moved by the mount member. And a fixed guard positioned on the outside and fixed to the cab body.

With this configuration, the mount member and the movable guard constitute a dynamic vibration absorber, and when the cab vibrates during traveling or excavation work, the movable guard is relatively moved by deformation of the mount member. Thereby, the vibration of the cab body can be suppressed. At this time, the relative movement of the movable guard can be covered from the outside by the fixed guard fixed to the cab body, giving the impression that the head guard is fixed to the cab body in a stable state, and increasing the confidence in the cab. Can be.

Further, the invention of claim 2 is that the fixed guard is formed as a frame surrounding the movable guard from the outside in the horizontal direction.

[0014] With this configuration, the fixed guard can surround the front and rear directions and the left and right directions of the movable guard.

Further, according to a third aspect of the present invention, the mount member is made of laminated rubber having high rigidity in the up and down directions and low rigidity in the horizontal direction. The laminated rubber has a lower end attached to the cab body and an upper end. Is attached to the movable guard.

With this configuration, the movable guard is easily displaced in the horizontal direction, and the displacement in the upward and downward directions is limited. Therefore, even when a falling object such as a falling rock collides with the movable guard during excavation work, the movable guard can be prevented from being largely displaced downward and interfering with the cab body, and the cab body can be protected by the movable guard. .

According to a fourth aspect of the present invention, there is provided a first damper between a cab body and a movable guard for damping front and rear vibrations of the movable guard with respect to the cab body, and a left and right direction damper. A second damper for damping vibration is provided.

With this configuration, when vibration of the cab body is suppressed by relative movement of the movable guard due to deformation of the mount member, the movable guard is moved forward, rearward, or leftward by the restoring force of the mount member. , Right and left residual vibrations can be attenuated by the first damper, and left and right residual vibrations can be attenuated by the second damper. .

Further, the invention according to claim 5 is characterized in that an elastic body for adjusting a horizontal spring constant of the mount member is provided between the movable guard and the fixed guard.

With this configuration, by appropriately changing the elastic force of the first and second elastic members, the spring constant of the mount member for relatively moving the movable guard forward and backward, and the movable guard And the spring constant of the mount member that relatively moves left and right can be adjusted as appropriate.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a cab for a construction machine according to the present invention will be described in detail below with reference to FIGS. First, FIGS. 1 to 6 show a first embodiment according to the present invention.

In FIG. 1, reference numeral 1 denotes a traveling body, 2 denotes a revolving body mounted on the traveling body 1 so as to be revolvable,
Is a building cover which is disposed at the front left side of the turning frame 3 and which will be described later, and which is disposed at the rear side of the cab 7 and houses a motor (not shown) and the like. 4 and a counterweight 5 disposed on the rear side of the building cover 4. In the center of the front part of the revolving superstructure 2, a working device 6 for performing excavation work, rock drilling work and the like of earth and sand is provided so as to be able to move up and down.

Reference numeral 7 denotes a cab disposed on the front left side of the revolving frame 3. The cab 7 has an upper surface portion 8A and a front surface portion 8A.
B, a cab body 8 formed in a box shape from a rear surface portion 8C and left and right side portions 8D (only the left side surface portion is shown), and a cab body 8 provided above the cab body 8 to drop falling rocks during rock drilling work. And a head guard 10 to protect the cab body 8 from objects.

Here, the cab body 8 is supported on the revolving frame 3 via an anti-vibration mount (not shown) and the like, and has a driver's seat, an operating cab in which operating devices (both not shown) are housed. It is defined. On the upper surface 8A of the cab body 8, four brackets 9, 9,... Having a U-shaped cross section are fixed by welding or the like in order to mount a mount member 14 described later (see FIG. 2). .

Reference numeral 10 denotes a head guard which forms the cab 7 together with the cab body 8. The head guard 10 includes a movable guard 11 disposed at the center of the upper surface of the cab body 8 as shown in FIGS. A mount member 14 described below provided between the movable guard 11 and the cab body 8, and a cab body 8 positioned outside the movable guard 11 in the horizontal direction.
It is composed of a fixed guard 23 described later fixed above.

Reference numeral 11 denotes a movable guard which constitutes the head guard 10. The movable guard 11 includes an upper plate 11A, a front plate 11B and a rear plate 11C formed by bending the outer periphery of the upper plate 11A downward. , The left side plate 11D and the right side plate 11E are formed in a flat box shape.
And, between the front plate 11B and the rear plate 11C,
One reinforcing plate 12 extending rearward is joined by welding or the like, and between the reinforcing plate 12 and the left side plate 11D and between the reinforcing plate 12 and the right side plate 11E, left and right. The four extending reinforcing plates 13, 13, ... are joined.

Here, the movable guard 11 and each reinforcing plate 1
Each of the steel plates 2 and 13 is made of a steel plate having a plate thickness of, for example, about 3.2 to 4.5 mm, and can secure sufficient strength against falling objects such as falling rocks during excavation work. The movable guard 11 is mounted on the upper surface 8A of the cab body 8 via the mount member 14, and the cab body 8
, And constitutes a mass body of a dynamic vibration absorber that suppresses vibration of the cab body 8 by moving relative to the cab body 8.

, Are upper surface portions 8 of the cab body 8.
FIG. 5 shows four mounting members provided at four corners of the movable guard 11 located between the movable guard 11 and the movable guard 11, and each of the mounting members 14 is a disk having a bolt 15A as shown in FIG. An upper mounting plate 15, a disk-shaped lower mounting plate 16 having bolts 16 </ b> A, and a laminated rubber 17 fixed between the upper mounting plate 15 and the lower mounting plate 16. The laminated rubber 17 constitutes a dynamic vibration absorber together with the movable guard 11, and its spring constant is determined by the laminated rubber 17.

Here, the laminated rubber 17 is composed of a rubber cylinder 17A made of a rubber material and a plurality of thin steel plates 17B, 17B laminated in parallel in upper and lower directions at predetermined intervals in the rubber cylinder 17A. , ... The laminated rubber 17 has a large rigidity in the laminating direction (upward and downward) of each thin steel disk 17B, and has a horizontal direction (front, rearward and left and right) orthogonal to the laminating direction of each thin steel disk 17B. direction)
Is set small.

Each mount member 14 is fixed to the movable guard 11 by inserting a bolt 15A of the upper mounting plate 15 into the upper surface plate 11A of the movable guard 11 and screwing a nut 18 to the bolt 15A. At the same time, the bolt 16A of the lower mounting plate 16 is inserted through the bracket 9, and a nut 19 is screwed onto the bolt 16A, thereby being fixed to the cab body 8 side.

Thus, the movable guard 11 is provided with the laminated rubber 1.
The cab body 8 is mounted on the upper surface 8A of the cab body 8 via each mounting member 14 having the cavities 7 and the vibration energy of the cab body 8 is
Are transmitted to the movable guard 11 through the like, for example, the movable guard 11 vibrates in the opposite direction to the cab body 8 (relative movement).
By doing so, the vibration of the cab body 8 is suppressed.

Reference numerals 20, 20 denote two first oil dampers provided between the upper surface 8A of the cab body 8 and the movable guard 11 so as to extend in the front and rear directions, as shown in FIGS. As described above, each of the oil dampers 20 is rotatably attached to the bracket 9 of the cab body 8 on the cylinder side, and is rotatably attached to the lower surface of the upper surface 8A of the movable guard 11 on the rod side. Each of the oil dampers 20 buffers vibrations of the movable guard 11 in front and rear directions with respect to the cab body 8.

Reference numerals 21 and 21 denote two second oil dampers provided between the upper surface 8A of the cab body 8 and the movable guard 11 so as to extend leftward and rightward, respectively, as shown in FIGS. As described above, each of the oil dampers 21 is rotatably attached to the bracket 9 of the cab body 8 on the cylinder side, and the elastic body 2 such as rubber is attached to the reinforcing plate 12 of the movable guard 11 on the rod side.
2 attached. Each oil damper 21 is for damping left and right vibrations of the movable guard 11 with respect to the cab body 8.

Reference numeral 23 denotes a fixed guard positioned outside the movable guard 11 in the horizontal direction and fixed on the upper surface 8A of the cab body 8. The fixed guard 23 is, as shown in FIGS. A flat box-shaped frame body is formed by the front plate 23A, the front plate 23B, the rear plate 23C, the left side plate 23D, and the right side plate 23E formed by bending an outer peripheral portion of the upper plate 23A downward. I have.

Here, a rectangular opening 24 which is larger than the upper surface plate 11A of the movable guard 11 is formed in the center of the upper surface plate 23A, and the movable guard 11 is arranged with a gap inside the opening 24. Have been. In addition, between the left side plate 23D and the right side plate 23E of the fixed guard 23,
One reinforcing plate 25 extending in the left and right directions is joined by welding or the like, and protrudes forward from the upper end portion 8A of the cab body 8 at the front end side of the fixed guard 23 located on the front side of the reinforcing plate 25. I have.

Are fixed to the lower surface of the upper plate 23A of the fixed guard 23 at positions around the opening 24.
As shown in FIG. 5, each mounting leg 26 is joined to a perimeter of a through hole 27 formed in the upper surface plate 23A of the fixed guard 23 and extends downward, as shown in FIG. It comprises a mounting plate 26B joined to the lower end of the cylindrical body 26A. Then, a bolt 28 is inserted through a through hole 26C formed in the center of the mounting plate 26B, and the bolt 28 is screwed to a screw seat 29 fixed to the upper surface plate 8A of the cab main body 8, so that the cab main body 8 The fixed guard 23 is fixed on the upper surface plate 8A.

Thus, the fixed guard 23 surrounds the movable guard 11 from the outside in the horizontal direction to front, rear, left and right, and when the cab body 8 vibrates, the cab body 8
The movable guard 11 which moves relative to the fixed guard 2
3, so that it can be covered from the outside.

Reference numerals 30, 30,... Are lids fixed to the upper plate 23A of the fixed guard 23 by welding or the like at positions corresponding to the respective mounting legs 26. The lid 30 is formed in the upper plate 23A. By closing the through hole 27, rainwater or the like is prevented from entering the mounting leg 26 through the through hole 27.

The hydraulic excavator provided with the cab 7 according to the present embodiment has the above-described configuration, and its operation will be described below.

First, when the swing frame 3 vibrates during traveling of the traveling body 1 or during excavation work by the working device 6, this vibration is transmitted to the cab body 8 provided on the swing frame 3, and the cab body 8 is moved forward. Vibrates backward, left, or right.

Then, the vibration of the cab body 8 is transmitted to the movable guard 11 via the mount member 14, and, for example, as shown in FIG. It vibrates in the opposite direction to the cab body 8, and the vibration of the cab body 8 can be suppressed by the dynamic vibration absorbing action of the movable guard 11 at this time.

At this time, the movable guard 11 is attached to the cab body 8
In this embodiment, the fixed guard 23 is provided on the upper surface 8A of the cab body 8 so as to surround the movable guard 11 in order to suppress the vibration of the cab body 8. The movable guard 11 can be covered from outside by the fixed guard 23. Therefore, even if the movable guard 11 moves relative to the cab body 8,
Only the fixed guard 23 can be seen from outside, and the movable guard 11 is not seen. Therefore, the impression that the head guard 10 is fixed to the cab body 8 in a stable state is given, and the sense of trust in the cab 7 can be increased.

The laminated rubber 17 constituting the mount member 14 is compared with the rigidity in the front and rear directions and the rigidity in the left and right directions.
Since the rigidity in the upward and downward directions is set to be large, even if a falling object such as a falling rock collides with the movable guard 11 during excavation work, it is possible to suppress the movable guard 11 from being largely displaced downward. The movable guard 11 is the cab body 8
Interference can be prevented. Therefore, the head guard 10 including the movable guard 11 and the fixed guard 23 can sufficiently fulfill the original function of protecting the cab body 8 from falling objects such as falling rocks.

Further, when the movable guard 11 vibrates in the horizontal direction by deforming the laminated rubber 17,
The restoring force of the movable guard 11 may cause residual vibration in the front, rear, left, and right directions. But,
Between the cab body 8 and the movable guard 11, a first oil damper 20 for connecting the cab body 8 and the movable guard 11 to the front and rear directions, and the cab body 8 and the movable guard 11 to the left and right directions. , The residual vibration of the movable guard 11 can be attenuated by the oil dampers 20, 21. Therefore, the resonance phenomenon of the cab body 8 due to the residual vibration of the movable guard 11 can be reliably suppressed.

FIGS. 7 to 9 show a second embodiment according to the present invention.
The present embodiment is characterized in that an elastic body is provided between a movable guard and a fixed guard. In this embodiment, the same components as those in the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

7 and 8, reference numeral 31 denotes a head guard applied to the present embodiment instead of the head guard 10 according to the first embodiment.
Is generally composed of the movable guard 11, each mounting member 14, and the fixed guard 23, but between the movable guard 11 and the fixed guard 23, a first elastic body 32 and a second elastic body 36 described later are provided. Is provided.

Are four first elastic members provided before and after the movable guard 11 and between the movable guard 11 and the fixed guard 23. As shown in FIG. , And a pair of mounting plates 33, 33, and a columnar rubber body 34 fixed between the mounting plates 33. Here, two of the elastic members 32 located on the front side are disposed between the front plate 11B of the movable guard 11 and the reinforcing plate 25 of the fixed guard 23, and are located on the rear side of the elastic members 32. These two members are disposed between the rear plate 11C of the movable guard 11 and the brackets 35 fixed to the lower surface of the fixed guard 23.

The rubber body 34 of each elastic body 32 is elastically deformed between the movable guard 11 and the fixed guard 23 when the movable guard 11 vibrates forward and backward.
Therefore, by changing the elastic force of the rubber body 34,
The spring constant of the mount member 14 when the movable guard 11 oscillates forward and backward can be appropriately adjusted,
The movable guard 11 can obtain an optimal dynamic vibration absorbing action against the front and rear vibrations of the cab body 8.

Are four second elastic members located on the left and right sides of the movable guard 11 and disposed between the movable guard 11 and the fixed guard 23. The second elastic members 36 are also the same as those described above. Similarly to the first elastic body 32 described above, a pair of mounting plates 33 and the respective mounting plates 3
3 and a columnar rubber body 34 fixed therebetween. Here, two of the elastic members 36 located on the left side are the left side plate 11D of the movable guard 11 and the fixed guard 23.
Two of the elastic members 36 located on the right side of the elastic body 36 are fixed to the right side plate 11E of the movable guard 11 and the lower surface side of the fixed guard 23. Between the brackets 38, 38.

The rubber body 34 of each elastic body 36 is elastically deformed between the movable guard 11 and the fixed guard 23 when the movable guard 11 vibrates left and right.
Therefore, by changing the elastic force of the rubber body 34,
The spring constant of the mount member 14 when the movable guard 11 vibrates in the left and right directions can be appropriately adjusted.
The configuration is such that the movable guard 11 can obtain an optimal dynamic vibration absorbing action against left and right vibrations of the cab body 8.

The head guard 31 according to the present embodiment has the above-described configuration, and its basic operation is not particularly different from the head guard 10 according to the first embodiment.

However, in the head guard 31 according to the present embodiment, between the movable guard 11 and the fixed guard 23,
The first elastic body 32 and the second elastic body 36 are provided.

For this reason, by making the elastic force of the rubber body 34 constituting the first elastic body 32 different from that of the rubber body 34 constituting the second elastic body 36, the movable guard 11 , The spring constant by the mount member 14 when vibrating in the backward direction and the spring constant by the mount member 14 when the movable guard 11 vibrates in the left and right directions can be individually adjusted. Thereby, the movable guard 11 can obtain the optimal dynamic vibration absorbing action against the vibration (pitching) in the front and rear directions of the cab body 8 and the vibration (rolling) in the left and right directions of the cab body 8. .

Further, even when the movable guard 11 vibrates largely in the front and rear directions or in the left and right directions, the movable guard 1
Elastic members 32, 36 provided between the first and the fixed guard 23.
Accordingly, it is possible to reliably prevent the movable guard 11 from colliding with the fixed guard 23 and causing noise, breakage, and the like.

In the first embodiment described above, four brackets 9 are fixed to the upper surface 8A of the cab body 8, and the movable guard 11 is attached to each bracket 9 via the mounting member 14. However, the present invention is not limited to this. For example, as shown in a modified example shown in FIG.
E, a long bracket 4 extending leftward and rightward
It is also possible to adopt a configuration in which the movable guards 11 are fixedly provided and the movable guard 11 is supported by the brackets 41 via the mount member 14.

Further, in the above-described second embodiment, the case where each of the elastic bodies 32 and 36 is constituted by the columnar rubber body 34 has been described as an example. However, the present invention is not limited to this. A liquid-filled rubber mount in which a high-viscosity silicone oil or the like is sealed in a rubber body having an oil damper may be used. It can be unnecessary.

Further, in each of the above-described embodiments, the cab of the hydraulic shovel is taken as an example of the cab for the construction machine. However, the present invention is not limited to this, and other construction cabs such as a wheel loader and a hydraulic crane may be used. Can be widely applied to machine cabs.

[0058]

As described above, according to the first aspect of the present invention, the head guard is provided between the movable guard and the movable guard and the cab body, and the movable guard is supported so as to be relatively movable. And a fixed guard fixed to the cab body, located outside the movable guard in the horizontal direction, so that the dynamic damper is composed of the mount member and the movable guard. In this case, when the cab body vibrates, the movable guard relatively moves due to the deformation of the mount member, whereby the cab body vibration can be suppressed. At this time, by covering the relative movement of the movable guard by the mount member from the outside with the fixed guard, an impression that the head guard is fixed to the cab body in a stable state can be given, and the reliability of the cab can be enhanced.

According to the second aspect of the invention, the fixed guard is formed as a frame surrounding the movable guard from the outside in the horizontal direction.
Later, the left and right directions can be surrounded, and the movable guard that moves relatively can be reliably covered from the outside.

Further, according to the third aspect of the present invention, the mount member is made of laminated rubber having high rigidity in the upward and downward directions and low rigidity in the horizontal direction, and the lower end of the laminated rubber is attached to the cab body. Since the upper end is attached to the movable guard, the displacement of the movable guard in the upward and downward directions can be limited. For this reason, even if a falling object such as a falling rock collides with the movable guard during excavation work, the movable guard can be prevented from being largely displaced downward and interfering with the cab body, and the movable guard can reliably protect the cab body. Can be.

According to the fourth aspect of the present invention, a first damper is provided between the cab body and the movable guard for damping vibrations in front and rear directions of the movable guard with respect to the cab body.
Since the second damper is provided to buffer left and right vibrations, when the movable guard relatively moves due to the deformation of the mount member and the vibration of the cab body is suppressed, the movable guard is mounted on the mount member. Even if residual vibration in the front and rear directions or left and right directions is caused by the restoring force of the movable guard, the residual vibration can be attenuated by the first and second dampers, and the residual vibration of the movable guard causes The resonance phenomenon can be reliably suppressed.

Further, according to the fifth aspect of the present invention, an elastic body for adjusting the horizontal spring constant of the mount member is provided between the movable guard and the fixed guard. The spring constant of the mount member that vibrates the movable guard forward and backward and the spring constant of the mount member that vibrates the movable guard left and right by appropriately changing the elastic force of the Can be. For this reason, the movable guard can obtain an optimal dynamic vibration absorbing effect against the front and rear vibrations and the left and right vibrations of the cab body.

[Brief description of the drawings]

FIG. 1 is a front view showing a hydraulic excavator to which a cab for construction equipment according to a first embodiment of the present invention is applied.

FIG. 2 is a plan view of the head guard as viewed from the direction of arrows II-II in FIG.

FIG. 3 is a longitudinal sectional view showing a movable guard, a fixed guard, a mount member, and the like as viewed from the direction of arrows III-III in FIG. 2;

4 is a movable guard viewed from the direction of arrows IV-IV in FIG. 2;
FIG. 4 is a longitudinal sectional view showing a fixed guard, a mount member, and the like.

FIG. 5 is an enlarged sectional view of a main part, showing a mount member and the like in FIG. 4 in an enlarged manner.

FIG. 6 is a longitudinal sectional view showing a state where the movable guard is vibrated and viewed from the same position as in FIG. 4;

FIG. 7 is a plan view similar to FIG. 2, showing a head guard according to a second embodiment.

8 is a longitudinal sectional view showing a movable guard, a fixed guard, a mount member, an elastic body, and the like, as viewed from the direction of arrows VIII-VIII in FIG.

FIG. 9 is an enlarged sectional view of a main part showing an elastic body and the like in FIG. 8 in an enlarged manner.

FIG. 10 is a plan view similar to FIG. 2, showing a modification of the first embodiment.

[Explanation of symbols]

 7 Cab 8 Cab Main Body 10, 31 Head Guard 11 Movable Guard 14 Mount Member 17 Laminated Rubber 20 First Oil Damper 21 Second Oil Damper 23 Fixed Guard 32, 36 Elastic Body

Claims (5)

[Claims] 1. A construction machine cab comprising: a cab body defining an operator's cab of a construction machine; and a head guard provided on an upper side of the cab body to protect the cab body from falling objects. The guard is a movable guard disposed on the cab body, a mount member provided between the movable guard and the cab body to support the movable guard so as to be relatively movable, and the movable guard is provided by the mount member. A cab for a construction machine, comprising: a fixed guard positioned outside the movable guard in the horizontal direction and fixed to the cab body to cover relative movement. 2. The fixed guard is formed as a frame surrounding the movable guard from the outside in the horizontal direction.
The cab for construction machinery according to claim 1. 3. The mounting member is made of laminated rubber having high rigidity in the up and down directions and low rigidity in the horizontal direction. The laminated rubber has a lower end attached to the cab body and an upper end attached to the movable guard. The cab for a construction machine according to claim 1, wherein the cab has a configuration. 4. A first damper between the cab body and the movable guard for damping vibrations in front and rear directions of the movable guard with respect to the cab body, and a second damper for damping left and right vibrations. Claim 1, wherein the damper is provided.
4. The cab for a construction machine according to 2 or 3. 5. An elastic body for adjusting a horizontal spring constant of the mount member is provided between the movable guard and the fixed guard.
Or the cab for construction machinery according to 4.