Power drill system with adjustable depth sensing means

Details Power drill system with adjustable depth sensing means Power drill system with adjustable depth sensing means

1988-01-05

1989-03-21

Weidenfeld, Gil

Cutting by use of rotating axially moving tool

With stopping upon completion of prescribed operation

408137, 408138, B23B 4500

Patent

active

048138223

ABSTRACT:
A power drill system the type having a positive drive spindle incorporating an adjustable depth control means mounted on the spindle. The depth control means includes a collar having an internal bore which is provided with threads conforming to the spindle threads. Thus, the collar may be longitudinally adjusted to a desired position on the spindle by rotating the collar relative to the spindle. The collar is provided with a plurality of circumferentially spaced detent chambers. A detent member is secured in at least one of the detent chambers and extends into at least one of the spindle grooves in order to key the collar against rotation relative to the spindle and thus fix the collar at the desired longitudinal location. A thrust bearing assembly is secured to the collar in interposition between the collar and the stop shoulder. Upon contact of the depth sensing means with the stop shoulder, the thrust bearing assembly permits relative rotational movement between the collar and the stop shoulder. In a second embodiment, the depth control means includes primary and secondary collars providing very precise depth control. In either embodiment the depth control unit can be mounted on the drilling end or trailing end into the spindle.

REFERENCES:
patent: 1305872 (1919-06-01), Bollie
patent: 3037405 (1962-06-01), Steyskal
patent: 3583822 (1971-06-01), Alexander et al.
patent: 3762827 (1973-10-01), Ziegelmeyer
patent: 3767313 (1973-10-01), Bohoroquez et al.
patent: 4182588 (1980-01-01), Burkart et al.
patent: 4495681 (1985-01-01), Eckman
patent: 4557646 (1985-12-01), Biek
patent: 4591299 (1986-05-01), Eckman

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