Cutting by use of rotating axially moving tool – Tool-support with means to move tool relative to tool-support – To move radially
Patent
1990-05-24
1991-12-31
Smith, James G.
Cutting by use of rotating axially moving tool
Tool-support with means to move tool relative to tool-support
To move radially
82171, 82173, 175220, B23B 4106, B28D 114
Patent
active
050767437
ABSTRACT:
A device for drilling an undercut in a borehole formed into a substrate includes a housing (1) containing a guide sleeve (2) with a bushing (4) arranged eccentrically within and rotatable relative to the guide sleeve. A torsion spring (6) is located between the guide sleeve and the bushing and is stressed when the bushing rotates relative to the sleeve. A drive shaft (8) with a cutter head (9) at one end is supported in the bushing and can be moved from a centered position into an eccentric position relative to the guide sleeve for forming the undercut. The rotational drive of the bushing (4) is afforded by the drive shaft (8) via an eccentric gear train. Furthermore, the gear train includes an internal ring gear (23) couplable to a gear train housing (19) by a wrap-around spring (31). In its stressed condition, the spring (31) can be released from outside the device so that the bushing (4) can be rotated by means of the eccentric gear train including the internal ring gear (23), gear wheels (20, 21) and an additional ring gear (24).
REFERENCES:
patent: 2871731 (1959-02-01), Stuber
patent: 3146641 (1964-09-01), Benjamin
patent: 3233480 (1966-02-01), Briney
patent: 3250155 (1966-05-01), Armstrong
patent: 4759152 (1988-07-01), Berger
patent: 4930585 (1990-06-01), Noser
Hilti Aktiengesellschaft
Shideler B.
Smith James G.
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