JP2525225Y2 - Ring bit - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention relates to a ring bit used for a double pipe method with a percussion drill and core boring.

[Prior Art] Conventionally, a ring bit used for percussion drills and core boring has a rectangular parallelepiped shape at the tip of a ring bit base 1 and a mountain-shaped top as shown in a plan view of FIG. 3a and a partial side view of FIG. 3b. 2 were implanted in a ring shape, and the gaps implanted with silver brazing or the like were welded.

As shown in FIGS. 4a and 4b, the mountain-shaped ridge line 2a is parallel to the longitudinal side surface 2b of the rectangular parallelepiped.

[Problem to be Solved by the Invention] However, in the case of a percussion drill, hitting and rotation are applied to the ring bit 1, and in the case of general core boring, pressing pressure and rotation are applied. The resulting slime is difficult to collect at the center, and therefore has the disadvantage that slime is difficult to discharge.

The present invention has been made in view of the above circumstances, and provides a ring bit configured such that slime cut by the tip of the ring bit is centered with the rotation of the bit.

[Means for Solving the Problems] The ring bit of the present invention is a ring bit for boring in which the same rectangular parallelepiped chip is implanted in a plurality of implantation grooves of the same width provided on the outer peripheral portion of the bottom surface of the ring bit base. The tip of each tip is formed in a mountain shape having a diagonal line connecting the outer vertex and the inner rear vertex as a ridge line in the excavation rotation direction.

[Operation] When the ring bit is rotated in a direction in which the ridgeline of the tip draws the slime toward the center, the slime flows along the ridgeline toward the center of the bit.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

1a is a plan view of a ring bit showing an embodiment of the present invention, FIG. 1b is a partial side view of the same, FIG. 2a is a perspective view of a chip,
FIG. 2b is a plan view of the chip.

In the ring bit of the present invention, the ring bit base
In a plurality of implantation grooves of the same width provided on the outer periphery of the bottom surface of 11,
A top-shaped chip 12 as shown in FIG. 2a is implanted and welded with a silver solder or the like as in the conventional case.

The shape of the tip 12 is a rectangular parallelepiped similar to the conventional tip, but the top is not a mountain shape having a ridge line parallel to the longitudinal side surface of the rectangular parallelepiped as in the prior art. A diagonal line connecting the outer vertex and the inner rear vertex with respect to the bit base 11 and the concentric arrow) is represented by a ridge line 12a.
When viewed from the tip end side, the longitudinal side surface 12b and the ridge line 12a of the rectangular parallelepiped are inclined as shown in FIG. 2b.

Therefore, set the ring bit 11 in the direction of excavation rotation (the direction of the arrow).
When the slime is excavated, the slime is transported toward the center along a ridge line 12a that is inclined with respect to the radial direction of the ring bit.

[Effects of the Invention] According to the ring bit of the present invention, the ridge formed by the chevron at the top of the tip is inclined with respect to the diameter direction of the bottom face of the ring bit. Since the slime is collected in the direction, the slime is taken in the inside and the slime is easily discharged.

The ring bit of the present invention is configured such that each tip of the same rectangular parallelepiped chip implanted in a plurality of implantation grooves of the same width provided on the outer peripheral portion of the bottom surface of the ring bit base is formed with an outer apex and an inner rear side in the direction of excavation rotation. Since the diagonal line connecting the vertices was formed into a mountain shape with a ridgeline, the part to be brazed to the implantation groove of the ring bit base of the chip was a rectangular parallelepiped as before,
For example, a chip can be easily manufactured and brazed in accordance with the same size of implant groove radially drilled at an equal pitch on the outer peripheral portion of the bottom surface of the ring bit base, and the tip shape is the rectangular diagonal line. The ridge is a chevron, and it is easy to manufacture with a simple shape, and it is easy to manufacture a uniform and inexpensive chip easily at a low cost. There is no need to distinguish the orientation, and the workability is good, and it is suitable for automating brazing work.

[Brief description of the drawings]

FIG. 1a is a plan view of a ring bit showing an embodiment of the present invention, FIG. 1b is a partial side view of the same, FIG. 2a is a perspective view of a chip of an embodiment of the present invention, FIG. 3a is a plan view of a conventional crown bit, FIG. 3b is a partial side view of the same, FIG. 4a is a perspective view of a conventional chip, and FIG. 4b is a plan view of the same. 11… Ring bit, 12… Tip, 12a …… Ridge line.

Claims (1)

(57) [Scope of request for utility model registration] 1. A boring ring bit in which the same rectangular parallelepiped chip is implanted in a plurality of implantation grooves of the same width provided on an outer peripheral portion of a bottom surface of a ring bit base. A ring bit formed in a mountain shape with a diagonal line connecting a side vertex and an inner rear vertex as a ridge line.