JPH0635355U - Head guard - Google Patents

Abstract

(57) [Summary] [Purpose] When the work vehicle is carried into the work site in the tunnel from a low-height carry-in path, the work of attaching and detaching the head guard is eliminated. [Structure] The front support column 2 is connected to the front upper support column 2u to the front lower support column 2l via a horizontal joint pin 8 so that the front upper support column 2u supporting the guard member 5 can be inverted to the front of the work vehicle. The upper and lower columns 3 at the rear
u, 3l, a lock bracket 6 provided at each of these ends, a bolt 11 common to a through hole of the lock bracket 6, and a nut 12 screwed to the bolt 11. Lock tool 9 for the work vehicle 20 is provided on the upper part of the head guard 1 with the joint pin 8 as the center.
The height can be lowered by inverting it to the front, and it can be easily returned to the normal state by rotating it backward to raise the head guard when loading the work vehicle from a low-height loading path. There is no need.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement in a head guard that protects a worker who drives a work vehicle such as a construction machine from falling objects, and more specifically, relates to a head guard mounted on a work vehicle that performs various works in a tunnel.

[0002]

[Prior art]

 Among various types of work vehicles such as construction machinery, for example, for work vehicles that work at work sites where there is a risk of falling rocks, falling rocks, etc. In order to protect workers, it is obligatory to equip a work vehicle with a head guard. As such a head guard, one having a structure in which the guard member is supported by four pillars standing upright around the driver of the work vehicle, or two pillars standing upright behind the driver etc. There is a structure in which a guard member extending to the front side of the driver's seat is supported by a cantilever. Of course, there are cab-type head guards, but particularly for small work vehicles, head guards with the above-mentioned simple structure are often adopted.

[0003]

[Problems to be solved by the device]

 The head guard according to the conventional example configured as described above has no particular problem in protecting the driver or the like who drives the work vehicle from a fallen object, but the condition of the carry-in route for carrying the work vehicle equipped with the head guard to the work site. Depending on the situation, there are some problems to be solved as below. In other words, due to work in a narrow space in a tunnel, there are many cases in which a worker or the like can easily pass through, but it is often necessary to bring a work vehicle into the work site in the tunnel from a passage with a small width or height. For example, a work vehicle for subway construction is downsized as a matter of work site, but in the case of a head guard, its size and other factors are restricted by the physical constitution of the human, so this can be freely adjusted. It cannot be miniaturized.

Therefore, it is not possible to carry in the work site in the tunnel with the head guard mounted, and after loading the work vehicle and the head guard separately, mount the head guard on the work vehicle at the work site in the tunnel. There must be. Such a head guard is rather heavy, and it takes a lot of labor to mount the head guard. Of course, it is necessary to screw a plurality of bolts in order to mount the head guard on the work vehicle, which is one of the causes of requiring a lot of labor to mount the head guard.

Therefore, an object of the present invention is to provide a head guard for a work vehicle that does not require attachment / detachment when the work vehicle is carried into a work site in a tunnel from a low-height passage. is there.

[0006]

[Means for Solving the Problems]

 In view of the above situation, the present invention makes it possible to easily lower the height of the head guard when the work vehicle passes through a low-height passage, and to easily restore the work vehicle to the normal state at the work site. This is because it is possible to eliminate the work of attaching and detaching the head guard if such a configuration is possible.

Therefore, the feature of the main means adopted by the head guard according to the present invention is that it is mounted on a work vehicle to protect a driver from a fallen object, and a pillar and a guard provided on the pillar. In the head guard consisting of members, the strut is composed of a lower strut and an upper strut that supports the guard member.The upper and lower struts are formed by joint pins in a direction orthogonal to the front-rear direction of the driver's seat. It is connected so that it can be reversed in the forward direction of the driver's seat, and on the opposite side is a removable lock that holds the upper and lower columns in a normal state.

[0008]

[Action]

 According to the head guard of the present invention, the support pillar for supporting the guard member is composed of the lower support pillar and the upper support pillar for supporting the guard member, and the upper and lower support pillars are orthogonal to the front-back direction of the driver's seat. Since it is connected to the front of the driver's seat so that it can be reversed by an articulating pin that is oriented, and a detachable locking device that holds the upper and lower columns in the normal state is provided on the opposite side, you can remove the removable locking device. The height of the head guard can be lowered by reversing the upper strut that supports the guard member with the joint pin toward the front of the driver's seat. Moreover, by raising the upper strut and locking it with a lock, the head guard can be lowered. Can be restored to the normal state.

[0009]

【Example】

 Hereinafter, a head guard according to an embodiment of the present invention will be described. A side view of the work vehicle showing the state in which the head guard is mounted is shown in FIG. It will be described with reference to FIG.

That is, reference numeral 1 shown in FIG. 1 is a head guard that is mounted on a crawler-type work vehicle 20 and supports a guard member 5 for protecting a driver or the like from a falling object with four columns. More specifically, the support columns are composed of a front support column 2 which is vertically erected and a rear support column 3 which is vertically installed. These front and rear support columns 2 and 3 are mounted on a traveling carriage 21 of a work vehicle 20 on a vertical axis. It is erected on a bracket member 4 fixed by a plurality of mounting bolts on a swingable swing frame 22 which is swiveled around the center, and the guard member is provided above the front and rear columns 2 and 3. 5 is supported horizontally.

The two front and rear columns 2 and 3 are provided upright in the width direction of the revolving frame 22 (however, only one is shown), but both of them are substantially in the vertical direction. The front support column 2 is divided in position, and the front support column 2 has a front lower support column 2l which is vertically installed on the bracket member 4 and a front upper support column 2u whose upper part is fixed to the guard member 5 and has the same inclination as the front lower support column 2l. It consists of

Further, two joint brackets 6 project from the front side of the upper portion of the front lower support column 2l, and one joint bracket 7 projects from the lower front portion of the front upper support column 2u. , One joint bracket 7 is fitted between the two joint brackets 6 and the horizontal joint pin 8 is commonly used for the joint brackets 6, so that the front upper support column 2u can be connected to the front of the work vehicle 20, That is, as shown by an imaginary line, these front upper and lower columns 2u and 2l are connected to the left side in FIG. 1a so that they can be reversed together with the guard member 5.

On the other hand, the rear support column 3 is composed of a rear upper support column 3u and a rear lower support column 3l, as in the front support column 2 as described above, but as shown in FIG. Locking brackets 10 with which the opposite surfaces contact each other are provided. By inserting the bolts 11 into the through holes provided in the locking brackets 10 and screwing the nuts 12 onto the bolts 11, The head guard 1 is configured to be able to maintain its state. That is, the lock bracket 9 is constituted by the lock brackets 10, 10, the bolt 11, and the nut 12.

It should be noted that the locking tool 9 is provided with a bracket projecting rearward similarly to the front upper / lower columns 2u and 2l, and a structure in which a detachable pin is shared with the bracket, but it is also a latch. The locking device may be of any type, and the structure of the locking device itself is not particularly limited, as long as the upper and lower rear columns 3u and 3l can be reliably connected.

The operation mode of the head guard 1 will be described below. The work vehicle 20 equipped with the head guard 1 having this configuration is transferred from a low-height carry-in path (not shown) to a tunnel (not shown). When carrying in, first, the nut 12 and the bolt 11 of the lock tool 9 are removed from the lock brackets 10 and 10, and the front upper support column 2u is rotated toward the front side of the work vehicle 20, with the joint pin 8 as the center of rotation. Rotate and invert as shown by the imaginary line in 1. The upper part of the head guard 1 can be reversed by disposing a reversing hydraulic cylinder between the upper part and the lower part of the head guard 1 and extending the rod of the reversing hydraulic cylinder. However, considering the frequency of rotation, it is not economically advantageous to provide such a reversing hydraulic cylinder because it is economically disadvantageous.

Then, as indicated by an imaginary line in FIG. 1A, the height is about half that of the head guard 1 in the normal state, which is at least lower than the height of the driver. Therefore, the work vehicle 20 with the head guard 1 still mounted is passed through the low-height carry-in path and carried into the tunnel without removing the head guard 1 from the work vehicle 20 as in the conventional case. can do.

On the other hand, when the work vehicle 20 arrives at the work site in the tunnel, the head guard 1 is restored to the normal state. In the restoration work, the upper side of the inverted head guard 1 is replaced with the joint pin 8 Is rotated to the rear side of the work vehicle 20, the ends of the rear upper and lower columns 3u and 3l are brought into contact with each other, and the bolt 11 is inserted into the through hole of the lock bracket 10 of the lock tool 9, and The nut 12 may be screwed onto the head guard 1, and the head guard 1 can be easily restored to the normal state.

As described above, according to the head guard 1 according to the embodiment of the present invention, it is possible to pass through the low-height carry-in path only by attaching / detaching the lock 9, and turning over and raising the upper part of the head guard 1. Since the head guard 1 can be restored, there is no need to put on and take off the head guard as in the conventional case. As a result, the work of bringing the work vehicle 20 into the tunnel is greatly simplified, and the labor required for putting on and taking off is greatly increased. Is reduced to. It is also possible to lower the height of the head guard by reversing the upper part of the head guard to one side in the width direction of the work vehicle. However, the width of the work vehicle is widened by the width of the head guard, which is inconvenient to pass through a narrow carry-in path. Therefore, the upper part of the head guard is inverted in front of the work vehicle. .

[0019]

[Effect of device]

 As described above in detail, according to the head guard according to the present invention, the height of the head guard is increased by removing the detachable locking device and reversing the upper strut supporting the guard member with the joint pin in front of the driver's seat. The head guard can be restored to its normal state by raising the upper support column and locking it with a locking tool. As a result of eliminating the need to put on and take off, there is a great effect on the reduction of the labor of work in the tunnel.

[Brief description of drawings]

1A is a side view of a work vehicle showing a state in which a head guard according to an embodiment of the present invention is mounted, and FIG. 1B is a side view of FIG.
FIG.

FIG. 2 is a detailed view of a lock device for a head guard according to an embodiment of the present invention.

[Explanation of symbols]

1 ... Head guard, 2 ... Front support | pillar, 2l ... Front lower support | pillar, 2u ... Front upper support | pillar, 3 ... Rear support | pillar, 3l ... Rear lower support | pillar, 3u ... Rear upper support | pillar, 4 ... Bracket member, 5
... Guard member, 6, 7 ... Joint bracket, 8 ... Joint pin, 9 ... Locking tool, 10 ... Locking bracket, 11 ...
Bolts, 12 ... Nuts, 20 ... Work vehicles, 21 ... Traveling carriages, 22 ... Turning frames.

Claims (1)

[Scope of utility model registration request] 1. A head guard, which is mounted on a work vehicle for protecting a driver from a fallen object, and comprises a pillar and a guard member provided on an upper part of the pillar, wherein the pillar is a lower pillar and the guard member. The upper and lower struts support the upper and lower struts, and these upper and lower struts are connected reversibly in the forward direction of the driver's seat by joint pins in a direction orthogonal to the front-rear direction of the driver's seat, and the A head guard that is equipped with a detachable lock tool that holds the lower column in a normal state.