Boring apparatus and method of modifying concrete blocks

Details Boring apparatus and method of modifying concrete blocks Boring apparatus and method of modifying concrete blocks

1990-04-02

1991-06-04

Briggs, William

Cutting by use of rotating axially moving tool

Processes

Bit detachable

408 89, 408109, B23B 3500

Patent

active

050209450

ABSTRACT:
A modified concrete block, apparatus and method of manufacture for making the concrete block which includes a bored arch-shaped inspection hole formed through one side wall into one cavity of the concrete block. The inspection hole, used for inspecting reinforcements within the cavity prior to filling with concrete, is formed by the apparatus and in accordance with the method of manufacture by boring a circular hole through the side wall at an acute angle to the side wall in alignment with one cavity. The hole, generally equal in diameter to the length of the cavity, is offset so that it extends from through one edge margin of the side wall toward, but not to, the other side margin of the side wall.

REFERENCES:
patent: 311055 (1885-01-01), Ashcroft
patent: 1277829 (1918-09-01), Baum
patent: 1728396 (1929-09-01), Day
patent: 1928756 (1933-10-01), Klausmeyer
patent: 2084686 (1937-06-01), Howard
patent: 3033298 (1962-05-01), Johnson
patent: 4466601 (1984-08-01), Raines

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