JPS64444Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a shovel working arm in which an inner arm portion is slidably fitted into a cylindrical outer arm portion in order to change the working locus of a bucket, for example.

In the above arm, earth and sand may adhere to and solidify on the outer surface of the inner arm part, and as a result, when shortening the arm, it may become impossible to shorten the arm to the end of the stroke, or the sliding surfaces of both arm parts may become loose. There was a risk of inconveniences such as early damage due to dirt and sand encroachment.

Therefore, as shown in FIGS. 5 and 6, the present inventor fixes the scraper 22 that acts on the outer surface of the inner arm portion 21a to the bracket 23 of the outer arm portion 21b with a bolt 24, Bolt insertion hole 25 formed in scraper 22
We devised a means to make the scraper 22 into an elongated hole that allows the scraper 22 to be adjusted by sliding toward the inner arm portion 21a. According to this means, the attached soil can be automatically removed as the arm is shortened, and by adjusting the slide of the scraper 22 according to the wear of the scraper 22, the desired soil removal effect can be maintained for a long period of time. However, it is troublesome to have to adjust the slide of the scraper 22 at the appropriate time, and it is difficult to adjust the scraper 22 accurately at the appropriate time depending on the wear of the scraper 22. There was a risk that it would not be able to exhibit a good soil removal effect.

The purpose of this invention is to automatically remove dirt and sand adhering to the outer surface of the inner arm portion as the arm is shortened, and to maintain the dirt removal effect well over a long period of time without requiring any special operations. The point is to make it possible to do so.

The structure of the present invention is characterized in that, in the aforementioned shovel work arm, a scraper that acts on the outer surface of the inner arm portion is attached to the outer arm portion in a state where it is elastically biased toward the inner arm portion. shall be.

In other words, the scraper attached to the outer arm can automatically remove the dirt that has adhered to the outer surface of the inner arm as the arm is shortened. The scraper is elastically biased toward the inner arm so that it is automatically maintained in contact with the outer surface of the inner arm regardless of wear, so it can be used for long periods of time without requiring any special operations. As a result, the earth and sand removal action can be exhibited well, and the above-mentioned inconveniences caused by the adhesion of earth and sand can be reliably eliminated over a long period of time.

Next, embodiments of the present invention will be described based on illustrative drawings.

As shown in FIG. 1, a swivel base 2 is attached to a crawler-type traveling machine base equipped with a soil removal plate 1 that can be freely raised and lowered, and the swivel base 2 is
A driving unit 3 and a driving unit 4 are mounted on the holder, and a boom 5 and an arm 6 are connected to each other by a cylinder 7 so as to be flexible and extendable, and a bucket 8 is attached to the tip of the arm 6.
A shovel working device is attached to a bracket 10 attached to the swivel base 2 so as to be swingable up and down with a cylinder 11, and the excavation work and soil removal work can be performed selectively. It is configured as a backhoe work vehicle that can be used to carry out backhoe operations.

To construct the arm 6, as shown in FIGS. 2 and 3, an inner arm portion 6a having the bucket 8 at its tip is connected to a cylindrical outer arm portion 6b pivotally supported on the boom 5. A cylinder 12 that is slidably fitted inside and for driving the inner arm portion 6a to move in and out is installed across both the inner and outer arm portions 6a and 6b, and is further provided on the lower surface of the outer surface of the inner arm portion 6a. A scraper 14 that acts on the portion 13 is attached to the tip side of the outer arm portion 6b. That is, by extending and contracting the arm 6 with the cylinder 12, the bucket 8 is used for excavating the bottom of a trench of different depths.
The bucket 8 can be moved parallel to the ground surface in order to change the work trajectory of the bucket or to scrape the ground at a certain depth. Even if it sticks, it can be automatically removed as the arm shortens.

To explain the scraper 14 in detail, the scraper 14 is pivoted to a bracket 15 attached to the outer arm portion 6b so that it can swing toward the inner arm portion 6a side, and the scraper 14 is pivoted toward the inner arm portion 6a side. A biasing tension spring 16 is provided to automatically maintain the scraper 14 in contact with the inner arm portion 6b despite wear.

Next, another embodiment will be described.

As shown in FIG. 4, a scraper 18 formed of a plate spring is bolted to a bracket 19 attached to the outer arm portion 6b in such a manner that it can be elastically returned to the inner arm portion side.

The shovel work arm of the present invention may be installed not only on a backhoe work vehicle but also on various shovel work vehicles such as a face shovel work vehicle.

Further, the scraper 14 or 18 may be provided so as to act on the entire circumference of the outer surface of the inner arm portion 6a, but as in the embodiment, it may be provided so as to act on the lower surface portion 13 where earth and sand are likely to adhere. The desired purpose can be achieved just by providing it.

[Brief explanation of drawings]

Fig. 1 is a side view of the backhoe work vehicle, Fig. 2 is a cutaway side view of the arm, Fig. 3 is a partially cutaway bottom view of the scraper attachment part, Fig. 4 is a side view of another embodiment, and Fig. 4 is a side view of another embodiment. 5 and 6 are a side view and a bottom view of a comparative example, respectively. 6a...inner arm portion, 6b...outer arm, 14 or 18...scraper, 16...spring.

Claims (1)

[Claims for Utility Model Registration] A shovel working arm in which an inner arm portion 6a is slidably fitted into a cylindrical outer arm portion 6b, which includes a scraper 14 or a scraper 14 that acts on the outer surface of the inner arm portion 6a. 18 is attached to the outer arm portion 6b in a state of being elastically biased toward the inner arm portion. Registration of a utility model characterized in that the scraper 14 is pivotally supported so as to be able to swing toward the inner arm portion 6a side, and is provided with a spring 16 that urges the scraper 14 toward the inner arm portion 6a side. A shovel working arm according to claim 1. The shovel working arm according to claim 1, wherein the scraper 18 is formed of a plate spring and is supported in a state in which it is elastically returned to the inner arm portion 6a.