Knock out device

Details Knock out device Knock out device

1997-01-31

1998-10-06

Howell, Daniel W.

Cutting by use of rotating axially moving tool

With product handling or receiving means

Ejector

408204, B23B 5104

Patent

active

058167528

ABSTRACT:
A slug removal system for a hole saw including a spring and a knock-out device are disclosed. The knock-out device has a bore longitudinally through its center to allow a drill bit, which acts as a guide for the hole saw, to pass therethrough. The knock-out device also has holes for two set screws, which secure the device to the hole saw. The knock-out device is tapered to avoid the blades of the saw, and is movably attached to the hole saw by the set screws. As the hole saw is used, the slug pushes the knock-out device back and compresses the spring, which is seated at the back of the hole saw. When the sawing is finished, the spring pushes the knock-out device forward, forcing the slug out of the hole saw.

REFERENCES:
patent: 58924 (1866-10-01), Webster
patent: 1234467 (1917-07-01), Hamilton
patent: 2184919 (1939-12-01), Miller
patent: 3265104 (1966-08-01), Gallo, Sr.
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patent: 4193721 (1980-03-01), Hougen
patent: 4295763 (1981-10-01), Cunniff
patent: 4652185 (1987-03-01), Malrick
patent: 5076741 (1991-12-01), Littlehorn
patent: 5108235 (1992-04-01), Czyzewski
patent: 5171111 (1992-12-01), Kishimoto
patent: 5352071 (1994-10-01), Cochran et al.

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