Cutting by use of rotating axially moving tool – With product handling or receiving means – Ejector
Patent
1987-03-13
1988-07-05
Weidenfeld, Gil
Cutting by use of rotating axially moving tool
With product handling or receiving means
Ejector
408204, 408703, B23B 5104
Patent
active
047550872
ABSTRACT:
An improved hole saw mandrel for use in a power drill or the like comprising an ejector mechanism which allows the operator to eject the plug that remains bound within the confines of the hole saw after the hole has been cut. The ejector mechanism is provided with rods which extend into the confines of the hole saw.
In the power operated embodiments, the ejector mechanism contains a thread follower which is engagable with a thread on the mandrel shaft thereby advancing the ejector mechanism along the shaft. This advancement causes the rods to progress through the confines of the hole saw and forces out the entrapped plug. Retraction of the rods is accomplished by one of several methods. In the one, the drill rotation is reversed causing the follower to reverse its direction and withdraw the rods. In another method, the follower is disengageable allowing the ejector mechanism to be retracted manually. Still another method uses a dual direction thread with engageable followers. The appropriate follower is engaged to control the direction of movement of the ejector mechanism without changing the drill rotation direction. In the manual design, the rods are forced through the confines of the hole saw by means of a manually slidable block. The rods are retracted by sliding the block in the reverse direction. An adaptor is provided to allow for attaching, to the mandrel, a hole saw of which the attaching contours do not match the contours of the present invention.
REFERENCES:
patent: 2349400 (1944-05-01), Beckwith
patent: 2435648 (1948-02-01), Frevel
patent: 4669928 (1987-06-01), Mediavilla
Bishop Steven C.
Weidenfeld Gil
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