JPH0454745Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a safety device for a trencher used for digging root vegetables such as burdock and yam.

[Conventional technology]

Generally, when using this type of trencher to dig up root vegetables, it is customary to carry out so-called backward digging, in which the trencher is moved back while digging a deep trench near the root vegetables using its excavation chain. However, deep trenches formed near root vegetables are easy to collapse, and there is a risk that the root vegetables will fall into the trench and be damaged by the digging chain. As people try to work as close together as possible, there are many accidents where people get caught in the excavation chain and get unexpectedly injured. In a device having an excavation chain b swingably protruding from the trencher body a, a frame-shaped safety guard c is protruded forward from the trencher body a, and this safety guard c is attached to the excavation chain b. By making it stick out above, when digging up root vegetables d by backward digging,
A device that prevents workers from getting close to drilling chain b has already been proposed.

[The problem that the idea attempts to solve]

Although the safety guard c is installed as described above and is useful for disaster prevention with the idea of not allowing people to approach or enter inside the safety guard, the safety guard is installed on the side away from the surface of the ground. Because the chain is attached to the side of the chain, it is unavoidable that when you approach an excavated trench, the excavated soil will collapse and your foot will fall into the range of motion of the excavation chain.
Therefore, such accidents can be avoided by installing a safety guard on the front of the excavation chain, but on the other hand, this safety guard becomes an obstacle and when you start digging, you end up digging in a boat-bottom style.
At the beginning of the ridge, the disadvantage is that the roots of the root crops cannot always be excavated.

[Means to solve the problem]

Here, this invention has an excavation chain that is swingably protruded from the trencher body and is driven in an endless band shape. A trencher protector in the form of a cover is attached to the guard bar over almost the entire length of the excavation chain, and a tip guard frame that covers the front surface of the excavation chain is attached to the top and bottom of the guard bar. The tip guard frame is provided with a frame piece having a width corresponding to the width of excavation by the excavation chain, and a roller rotatably supported on the tip. This paper proposes a safety device for a trencher in which the tip guard frame can be swung in a range from almost directly above to directly below.

[Effect]

In other words, with the safety device of this invention, the front of the excavation chain is guarded by the tip guard frame, which prevents accidents such as workers being caught in the excavation chain, and also protects each ridge. When starting digging, the guard frame is swung upward, and the boom is gradually lowered while moving the trencher body forward with the front of the excavation chain open, thereby making it possible to dig almost vertically. Therefore, the safety of digging up root vegetables using a trencher is improved, and the digging operation can be carried out reliably and easily.

〔Example〕

Next, this idea will be explained with reference to the drawings.

First, in FIGS. 1 to 4, an excavation chain 3 is attached to a boom 2 that is pivotally supported on a trencher body 1.
The boom 2 is looped around in an endless band between sprocket wheels rotatably mounted on both ends of the boom 2, and is driven by a drive means (not shown) mounted on the trencher body 1, and performs soil digging work. 4 and 5 are guide sprockets, respectively. Among these guide sprockets 4 and 5, in the vicinity of a frame 6 (see FIG. 2) that supports the upper guide sprocket 4 on the boom 2, the boom 2 is attached to a pair of tightening seat rings 7,
A guard bar mounting frame 9 having an inverted convex cross section is held by the upper tightening seat rings 7 and 7' and is welded to the upper tightening seat ring 7 by tightening the tightening seat rings 7 and 7' with bolts and nuts 8. In the narrow part 10 for passing through,
A steady rest piece 11 that comes into contact with the side surface of the frame 6 is fixed, and a guard bar 13 is bolted to the top surface of the wide part 12 above the narrow part 10 as appropriate, for example, via a seat plate. It can be installed using methods such as Guard bars 13 are installed along and above the excavation chain 3 at appropriate intervals (see FIG. 3), and a trencher protector 14 in the form of a cover is attached to the guard bar 13 over almost the entire length of the excavation chain 3. That's what I do. At this time, the width W of the trencher protector 14 is made to correspond to each size of excavation width, and the length L is made to correspond to each size of excavation depth.

A tip guard frame 15 that covers the front surface of the excavation chain 3 is attached to the tip of the guard bar 13 so as to be able to swing up and down via a pin 16.
It is equipped with a frame piece 17 having a width corresponding to W′ and a roller 18 rotatably supported at the tip (see FIG. 5),
The downward swinging movement of the guard frame 15 is restricted by abutting the guard bar 13 with a stopper 19 protruding from its base end, and the tip guard frame 15 itself is attached to the end of the trencher protector 14. By abutting against the upper part, the upward swinging movement is restricted, and as a result, it is configured to be able to swing in a range from approximately directly above to directly below.

FIG. 6 shows an example in which the frame 20 is constructed by integrating the frame 6 and the guard bar mounting frame 9, and FIG. 7 shows an example in which the frame 6 and the guard bar mounting frame 9 are integrated. However, this shows an example in which the guide sprocket attachment part 21 and the guard bar attachment part 22 are connected with bolts 23 so that they can be removed. Note that various modifications can be made in this portion depending on the cross-sectional shape of the boom 2.

The operation of the apparatus having the above-mentioned structure will be explained with reference to FIG. 8. At the beginning of digging, the tip guard frame 15 is swung and reversed to a position almost directly above, and the boom 2 is moved while the trencher main body 1 is advanced.
By lowering it little by little, you can dig in the directions A, B, and C, and you can dig an almost vertical trench. In this case, the tip guard frame 1
It is necessary that the fulcrum of the frame 15 is set back from the tip of the excavation chain 3 by the dimension L', and that the frame 15 is inverted.

Figures 9a and b compare the case where a trench is formed by digging forward a little at the beginning of digging, and the case where a trench is dug backward from the beginning. Although it is equipped with a tip guard frame that guards the front of the chain, by rotating and reversing it when you start digging,
As shown in a of this figure, an almost vertical groove can be formed from the beginning of digging, whereas with boat-bottom excavation as shown in b, it is impossible to dig up root vegetables at the beginning of the ridge.

[Effect of idea]

The above-mentioned safety device of this invention provides the following effects. Namely, (1) Since it directly covers the exposed part of the upper part of the excavation chain, it prevents crops and excavated soil from collapsing and does not damage the crops.

(2) The front part of the excavation chain can also be covered with a tip guard frame to prevent the excavator from getting caught in the excavation chain, and by swinging the guard frame upward and reversing it, the front part of the excavation chain can be covered. The advantage is that a non-bottom-shaped, substantially vertical trench can be formed at the beginning of digging.

[Brief explanation of drawings]

Fig. 1 is a side view showing an outline of the device of this invention attached to a trencher, Figs. 2 and 3 are perspective views of various parts of the first embodiment, and Fig. 4 shows its assembled state. 5 is a front view of a portion of FIG. 4, FIGS. 6 and 7 are perspective views of main parts of other embodiments, and FIG. 8 is an explanation of the operation of the device of this invention. Figures 9a and 9b are comparison diagrams of the digging start according to this invention and the digging start not based on this invention, and Fig. 10 is a side view of the conventional example. In the figure, 1... trencher body, 2...
...Boom, 3...Drilling chain, 13...Guard bar, 14...Trencher protector, 15...Tip guard frame, 17...Frame piece, 18...Roller.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a trencher having a drilling chain that swingably protrudes from the trencher body and is driven in an endless strip, the excavation chain is installed along and above the boom that supports the trencher. A guard bar is attached to the guard bar at an appropriate interval, and a trench protector in the form of a cover is attached to the guard bar over almost the entire length of the excavation chain, and a trench protector is attached to the tip of the guard bar to cover the front surface of the excavation chain. A trencher safety device characterized by a section guard frame that is attached so that it can swing up and down. (2) Claim 1, wherein the tip guard frame comprises a frame piece having a width commensurate with the width of excavation by the excavation chain, and a roller rotatably supported on the tip.
Trenchier safety equipment as described. (3) The safety device for a trencher according to claim 1, wherein the tip guard frame is configured to be swingable in a range from approximately directly above to directly below.