JP1705941S - Movable arm of excavation head - Google Patents

Abstract

This article is a movable arm for expanding the diameter of an excavation head, which is attached to an excavation head for forming a hole for pile driving or a hole for sheet pile driving in the ground and used for expanding the excavation diameter. Specifically, this article consists of an arm having a pin hole and two conical bits of the same size, which are connected at an angle to the tip of the arm. As shown in Reference FIGS. 1 and 2 in the state of use, this article is rotatably attached and used by a support frame provided in the middle of the blade path of the spiral blade of the excavation head. Specifically, by inserting the shaft support pin into the pin hole of the arm, it can be freely rotatably attached to the side view of the support frame in a substantially U-shaped frame. Since the arm of this article rotates freely around the shaft support pin, when the excavation head rotates in the forward direction, the article expands outward from the spiral blade as shown in Reference Figure 1 of the usage state. It becomes an open state. By excavating the ground in the expanded state, the excavation diameter can be surely expanded even for hard rock. On the other hand, when the excavation head rotates in the reverse direction, as shown in Reference FIG. 2 in the used state, the article is on the spiral blade and is stored inside the outer shape of the spiral blade in a plan view. After the excavation is completed, the excavation head can be collected in the stowed state.