JP4021700B2 - Construction machine guard fixing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a guard fixing device that protects an operator from falling rocks generated when working with a construction machine, flying rocks, and the like.
[0002]
[Prior art]
The rocks that are generated when excavating cliffs and slopes from below with a construction machine such as a hydraulic excavator and the rocks that are scattered when crushing the bedrock break through the glass mounted on the front or ceiling of the cab. May jump into the cab. For this reason, conventionally, measures have been taken to protect the operator from falling rocks or flying rocks by attaching a net-like guard to the front or ceiling of the cab, and as a guard fixing device, for example, JP-A-9-228422 Those described in (1) are known.
In the guard fixing device of the above publication, a plurality of support arms project from both sides of a front glass mounted on the front surface of the cab body, and a plurality of guards vertically divided on these support rods can be attached and detached with bolts. It has an attached structure.
In addition, the upper and lower guards are pivotally attached by hinges. By removing the bolts that secure the upper guard, the upper guard can be opened and closed forward with the hinge at the center. For example, a breaker is used. If you do not have to worry about rocks falling from above, such as crushing rocks, open the upper guard to secure the front view so that you can work efficiently. Yes.
[0003]
[Problems to be solved by the invention]
However, the guard fixing devices disclosed in the above publications have the following problems because of the structure in which the guard is fixed to the cab with a plurality of bolts.
In general, when starting work with construction machinery, start inspection of each part, but especially in places where dust is generated during work, since the dust adheres to the windshield etc. of the cab and the front visibility deteriorates, Then, at the start of the work or during the work, cleaning work such as wiping off dust adhered to the front glass is often performed, but with a guard fixed with multiple bolts like the conventional guard fixing device described above, Remove the bolts with a tool to open the guard, remove the guard from the cab and clean the dust attached to the windshield, remove the bolts and guards, clean the windshield, and then return to the original Since it takes a lot of time to fix the guard to the position with the bolt, there is a problem that the operation rate of the construction machine is lowered.
[0004]
The present invention has been made to improve such conventional problems, and it is an object of the present invention to provide a guard fixing device for a construction machine that can clean the front glass of a cab or can easily perform maintenance and other work. It is.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, a guard fixing device for a construction machine according to the present invention includes a frame body formed in front of a front glass in a cab of the construction machine and substantially the same size as the front surface of the cab. consists of attached mesh member inwardly, and a guard body is one end of the working machine side is pivotally mounted so as to be separable and rotated in front of the cab, the other end of the guard body Provided between an open end and the cab, a locking means for locking the open end side of the guard body to the cab, and provided between the cab and the guard body, The guard body is composed of fixing means for fixing the guard body in the open position.
[0006]
With the above configuration, when starting work inspection before starting work or cleaning dust etc. adhering to the front glass in the middle of work, by removing the locking means and opening the guard body, the front face of the guard body is not disturbed. Since dust and dirt adhered to the glass can be cleaned, cleaning work can be done in a short time. After cleaning, the guard body is closed at the use position and then locked in the operator's cab by means of locking. Because it can be started in a short time, it will rarely reduce the operating rate of construction machinery.
Also, during maintenance such as replacing worn wiper blades, by opening the guard body with the same operation as described above, maintenance work can be performed without being disturbed by the guard body, so that maintenance can be performed in a short time, Since there is no need to remove or install the bolts, the front glass can be cleaned and maintained safely even in places where the scaffolding is poor, such as at the work site, and the bolts are not lost. The guard body is not completely attached, and there is no concern that the safety of the guard is impaired.
[0007]
Furthermore, since the guard body can be easily removed from the cab, when the work does not require a guard, the work can be performed with good visibility by detaching the guard body from the cab, thus improving the work efficiency.
[0008]
Moreover, since the guard body is not closed carelessly by fixing the opened guard body with the fixing means, cleaning work and maintenance work can be performed safely.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment in which the present invention is applied to a guard installed in front of a cab of a hydraulic excavator will be described in detail with reference to the drawings.
1 is a side view of a hydraulic excavator, FIG. 2 is a front view of a guard installed on the front surface of the cab of the hydraulic excavator, FIG. 3 is a sectional view taken along line AA in FIG. 2, and FIG. FIG. 5 is a diagram for explaining the operation.
[0016]
In the hydraulic excavator shown in FIG. 1, a swivel body 4 is turnably mounted on a travel body 1 that can travel by a crawler belt 2 via a swivel mechanism 3.
The revolving unit 4 is provided with a cab 5 and a work machine 6 at the front, and an engine room 7 and a counterweight 8 in which an engine (not shown) is accommodated at the rear.
The work machine 6 attached to the front portion of the revolving body 4 has a base portion that is pivotally supported by the revolving body 4 and a boom-shaped boom 10 that is pivotable in the vertical direction by a boom cylinder 9. A base end portion is pivotally supported by the tip of the boom 10, a tip end side is pivotable in the front-rear direction by the arm cylinder 11, and a bucket 14 pivotally supported by the tip of the arm 12 and pivotable by the bucket cylinder 13 It is composed of
[0017]
A hydraulic pump (not shown) is connected to the engine housed in the engine chamber 7, and hydraulic oil discharged from the hydraulic pump is a hydraulic control valve group (not shown) installed near the center of the revolving structure 4. After the flow rate is controlled by the above, the cylinders 9, 11, 13 of the work machine 6, the turning motor, the traveling motor (both not shown) and the like are supplied.
[0018]
On the other hand, a guard body 16 is fixed in front of the front glass 15 mounted on the front surface of the cab 5.
The guard body 16 includes a frame body 16a that is formed to be approximately the same size as the front surface of the cab 5 to which the front glass 15 is attached, and a net body 16b that is attached to the inside of the frame body 16a.
The mesh body 16b is selected in such a size that the front view from the cab 5 is not obstructed, and the falling rocks and flying rocks do not pass through the mesh body 16b. The pivoting side is pivotally attached to the front surface of the driver's seat 5 by a plurality of hinges 17, and the open end side opposite to the work machine 6 is locked at a use position by a locking means 18.
A plurality of hinges 17 for pivotally attaching the guard body 16 are provided in accordance with the size and weight of the guard body 16, and the open end side where the locking means 18 is provided around these hinges 17 is shown in FIG. It can be opened almost 90 degrees.
Further, as the locking means 18 for locking the guard body 16 in the use position, a catch 19 as shown in FIGS. 3 and 4 is used.
[0019]
As shown in FIG. 2, the catches 19 are installed as follows, for example, at two locations on the upper and lower portions of the guard body 16.
A substantially U-shaped fixing member 5b is fixed to the front surface of a support column 5a made of a square pipe provided at the four corners of the cab 5 and is spaced apart in the vertical direction. The guard body 16 is attached to the front surface of these fixing members 5b. A stopper 20 made of an elastic body such as rubber that prevents the guard body 16 from colliding with the front surface of the cab 5 when the door is closed at the use position is fixed by a fixing tool 21.
As shown in FIG. 4, brackets 19a are fixed to the side surfaces of the fixing member 5b so as to be spaced apart from each other, and one end side of a support member 19b constituting the catch 19 can be rotated by pins 19c. It is pivotally attached to.
The support member 19b is formed by bending a metal plate, and a handle 19d is pivotally attached to the other end side by a pin 19e.
[0020]
The handle 19d is formed with a semicircular hook 19f at the base end portion on the support member 19b side from the pin 19e, and a block-shaped locking projection 19g at the distal end side.
The hook 19f is detachably engageable with a locking pin 19h provided on the side surface of the frame body 16a of the guard body 16, and the hook 19f is hooked on the locking pin 19h and the pin 19e is the center. By rotating the tip of the handle 19d in the direction of the arrow (A) in FIG. 3, the locking projection 19g protruding to the tip of the handle 19d is fitted into the locking recess 19i fixed to the side surface of the frame 16a. In addition, the guard body 16 can be locked at the use position.
[0021]
A locking lock 21 is provided in the locking projection 19g of the handle 19d, and the handle 19d can be locked in the locking position by rotating the key with a key (not shown) inserted into the locking lock 21. In addition, a fixing means 23 for fixing the guard body 16 to the open position is provided at the lower front portion of the cab 5.
One end side of the fixing means 23 is formed by a fixing rod 23b that is rotatable on the front surface of the cab 5 by a pin 23a, and a bent portion 23c formed at the other end of the fixing rod 23b is formed on the frame body 16a of the guard body 16. By fitting into the formed hole 23d, the guard body 16 can be fixed at a position opened approximately 90 degrees, and when the fixing rod 23b is not used, the front end side is provided on the front surface of the cab 5 By engaging the receiving seat 23e, the fixing rod 23a can be stored almost horizontally.
In FIG. 2, 24 is a wiper for wiping off water droplets attached to the front glass, 25 is a rearview mirror for confirming the rear, and 26 is a headlamp for illuminating the front.
[0022]
Next, the operation of the guard fixing device configured as described above will be described.
For example, when excavating cliffs and slopes from below with a hydraulic excavator or crushing rocks with a breaker, the guard body 16 is used as shown in Fig. 2 to protect the operator with falling rocks or flying rocks. In this position, the guard body 16 is locked by the locking means 18 so as not to be inadvertently opened. At this time, the stopper 20 made of an elastic body is compressed in advance, and the guard body 16 and the stopper 20 are thus compressed. Therefore, the guard body 16 does not rattle due to vibration during work, and the guard body 16 is biased in the opening direction by the elasticity of the stopper 20, so that the guard body 16 side is not moved. Since the provided locking pin 19h presses the handle 19d in the locking direction indicated by the arrow (A) in FIG. 3, even if the locking lock 21 is forgotten to close, the vibration during operation Never engagement of the locking means 18 is released by.
[0023]
On the other hand, when starting work before starting work or cleaning dust or the like adhering to the front glass 15 during work, the handle 19d of the locking means 18 is rotated in the direction of the arrow (b) in FIG. The locking projection 19g is removed from the locking recess 19i on the guard body 16 side. In this state, the guard body 16 is opened approximately 90 degrees around the hinge 17 as shown in FIG. 5, and the bent portion 23c of the fixing rod 23b is inserted into the hole 23d on the guard body 16 side, so that the guard body 16 is opened. Fix in position. As a result, dust and the like adhering to the front glass 15 can be cleaned without being obstructed by the guard body 16, so that the cleaning work can be performed safely in a short time, and after the cleaning, the fixing rod 23b is removed and the guard body 16 is moved to the use position. Since the work can be started immediately by being locked by the locking means 18 after being closed, there is no fear of reducing the operating rate of the construction machine.
[0024]
In addition, according to the embodiment of the present invention, maintenance work can be performed without being obstructed by the guard body 16 by opening the guard body 16 by the same operation as described above even during maintenance such as replacement of a worn wiper blade. Therefore, maintenance can be easily performed in a short time, and the work of removing and attaching bolts is not necessary, so that the front glass 15 can be safely cleaned and maintained even in places where the scaffolding is poor, such as the work site. In addition, since the bolts are not accidentally lost, the guard body 16 is not completely attached due to the shortage of bolts, and there is no concern that the safety as a guard is impaired.
[0025]
Furthermore, according to the embodiment of the present invention, since the fixing means 23 for fixing the guard body 16 in the open position is provided between the cab 5 and the guard body 16, the opened guard body 16 is fixed by the fixing means 23. Since the guard body 16 does not close carelessly by being fixed, the cleaning operation and the maintenance operation can be performed safely, and the locking means 18 is pivotally attached to one of the cab 5 or the guard body 16 and locked. Since the catch 19 comprising the handle 19d having the convex portion 19g and the locking concave portion 19i provided on the other side of the cab 5 or the guard body 16 and the locking convex portion 19g is detachably fitted is used. Moreover, since the heavy guard body 16 can be reliably locked and a commercially available catch can be used, the locking means can be obtained at a low cost.
[0026]
Further, according to the embodiment of the present invention, the guard body 16 is pivotally attached to the cab 5 by the separable hinge 17 so that the guard body 16 can be easily detached from the cab 5, so that the guard is not required. Sometimes, the work can be performed with good visibility by removing the guard body 16 from the cab 5, so that the work efficiency is improved and the open end of the guard body 16 is applied when the guard body 16 is closed to the use position. By providing the stopper 20 made of an elastic body at the contact position, it is possible to prevent the closed guard body 16 from colliding with the cab 5 and the guard body 16 is pressed in the opening direction by the elasticity of the stopper 23. Therefore, there is no worry that the locking means 18 is detached due to vibration during operation.
[0027]
In addition, although the said embodiment demonstrated the case where the guard main body 16 was provided in the front side of the front glass 15 with which the front surface of the cab 5 was mounted | worn, the roof glass (not shown) provided in the roof of the cab 5 was demonstrated. A similar guard body 16 may be provided on the upper side, and the present invention can be applied to all construction machines that perform work that may cause falling rocks and rocks during work.
The position of the hinge 17 for pivotally attaching the guard body 16 may be provided on the side surface of the frame body 16a opposite to the work machine 6 or on the upper or lower part of the frame body 16a depending on the direction in which the guard body 16 is opened. In addition, if the hinge 17 that can be disassembled is used, the guard body 16 can be removed from the cab 5.
Further, in the above-described embodiment, the catch 19 with the lock lock is used as the locking means 18, but the catch 19 without the lock lock 21 may be used, and the lock means 18 having another structure is used. Of course.
[0028]
【The invention's effect】
As described in detail above, the present invention includes a guard body having one end pivotably provided in front of a front glass in a cab of a construction machine, an open end serving as the other end of the guard body, and a cab. Since it is provided with a locking means that locks the open end side of the guard body in between, when starting work before starting work and cleaning dust etc. adhering to the front glass during work Removes the locking means and opens the guard body to clean the dust and the like adhering to the front glass without being obstructed by the guard body. Since the work such as excavation can be started immediately by being locked by the locking means after being closed at the use position, the operating rate of the construction machine can be increased.
[Brief description of the drawings]
FIG. 1 is a side view of a construction machine adopting a guard fixing device according to an embodiment of the present invention.
FIG. 2 is a front view showing a guard fixing device for a construction machine according to an embodiment of the present invention.
3 is a cross-sectional view taken along line AA in FIG.
4 is an enlarged arrow view from the direction B in FIG. 3;
FIG. 5 is an operation explanatory view of a guard fixing device for a construction machine according to an embodiment of the present invention.
[Explanation of symbols]
5 cab 15 front glass 16 guard body 17 hinge 18 locking means 19 catch 19d handle 19g locking projection 19i locking recess 20 stopper 23 fixing means

Claims (1)

It consists of a frame formed in the front of the front glass in the cab of the construction machine and approximately the same size as the front of the cab and a net attached to the inside of the frame, and is on the working machine side. one end and a guard body that is separable and rotatably pivoted on the front of the cab, is provided between the other end to become an open end and the cab of the guard main body, the opening of the guard body An engagement means for engaging and disengaging an end side to and from the cab, and a fixing means provided between the cab and the guard main body and fixing the guard main body in an open position. Guard fixing device for construction machinery.

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