a hole opener

Abstract

The present invention proposes a hole saw, including a hole saw body, the two ends of the hole saw body are respectively provided with a diamond grinding head and a drill shank, and the hole saw body is formed by butting at least two connecting cylinders, The end surface of one of the connecting cylinders facing the other connecting cylinder is provided with butt projections that are evenly distributed along its circumferential direction and protrude along its axial direction. A V-shaped groove opened in the axial direction; the end surface of the other connecting cylinder facing the docking protrusion is provided with docking depressions uniformly distributed along its circumferential direction and concave in the axial direction. There are V-shaped protrusions on both sides of the circumferential direction that are mated with the V-shaped grooves; There is an outer groove, and a C-shaped spring ring is clamped on the outer groove. The invention has the advantages that the length of the hole saw can be changed according to the depth of the hole, and the butt concentricity is high.

Description

technical field [0001] The invention relates to the construction field, in particular to a hole saw. Background technique [0002] During building construction, many walls involve opening holes, or in some occasions where large holes need to be opened, it is necessary to use a hole opener to open multiple interconnected holes for cutting, and this type of hole is often thicker , the traditional hole saw is not suitable for deep holes due to its short length, so it is necessary to purchase a special extended version of the hole saw to be competent, but this will cause the extended version of the hole saw to be affected by the longer length Due to the limitation of axial length, it is difficult to drill holes in a narrow space, and the scope of application is small, resulting in waste of equipment resources and increased cost investment. Contents of the invention [0003] Based on the above problems, the object of the present invention is to provide a hole saw that can chan...

AI Technical Summary

Problems solved by technology

[0005] In the above structure, the docking protrusion and the docking recess between the connecting cylinders are mated and mated to realize the docking and torque transmission. While transmitting the torque, the V-shaped groove and the V-shaped protrusion cooperate with each other to make the two connecting cylinders connect and connect. When the hole is opened, the V-shaped protrusion slides to the bottom of the V-shaped groove to play a centering role, so that the concentricity between the connecting cylinders is guaranteed, the opening efficiency is improved, and unnecessary friction is reduced. According to the actual hole opening depth, multi-section connecting cylinders can be docked to extend the length of the hole saw body. When opening holes in some narrow places, the hole saw body can be drilled into the wall to a certain depth first and then the connection tube can be added. Extended to effectively solve the problem that the space is too small to allow the hole saw to drill into the hole; the outer groove cooperates with the C-shaped spring ring, and the C-shaped spring ring can be used to limit the axial slip between adjacent connecting cylinders. After the C-shaped spring ring is snapped into the outer groove, it can prevent the docking protrusion and the docking depression from being disengaged from each other

Images