Stone working – Sawing – Endless
Patent
1993-01-08
1994-04-05
Rose, Robert A.
Stone working
Sawing
Endless
51241B, 83661, B28D 108
Patent
active
052995526
ABSTRACT:
A circular opening is formed in a structure by: forming through-holes 4, 3 in the structure 1 to be cut on a circular cutting line 2 and at the center of the circular cutting line; inserting a shaft 5 through the center through-hole 3; securing support arms 13, 20 to both ends of the shaft 5; passing an endless wire saw 23 through the through-holes 4 on the cutting line and around pulleys 15, 22 mounted on the support arms 13, 20; and driving the wire saw 23 by a drive unit while rotating the support arms 13, 20 about the shaft 5.
The apparatus for cutting a circular opening in a structure comprises: a shaft inserted through a through-hole formed in a structure to be cut; support arms secured to both ends of the shaft; pulleys mounted to the support arms; an endless wire saw passed through through-holes formed in the structure along a line connecting the pulleys around the pulleys; a pulley drive unit; and a support arm rotating unit. With this method and lightweight apparatus, a circular opening of a large diameter can be stably made in a structure.
REFERENCES:
patent: 2297074 (1942-09-01), Rohrdanz
patent: 3378307 (1968-04-01), Dempsey
patent: 4633848 (1987-01-01), Bresciani
patent: 5001870 (1991-03-01), Yokota
patent: 5016354 (1991-05-01), Baine
Kabushiki Kaisha Dymosha
Rose Robert A.
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