Turning – Process of turning
Patent
1996-12-04
1998-11-24
Pitts, Andrea L.
Turning
Process of turning
82 12, 142 49, 142 38, B27C 706
Patent
active
058393331
ABSTRACT:
A manually directed lathe tool system for removal of internally disposed material and creating a void inside a lathe turned form. As shown in FIG. 1, an articulated boring bar (32) of a tubular crosssection is slidably manipulated and supported by a plane surface (140) during a cutting action. To increase offset cutting ability several different lengths of a detachable and hinged arm assembly (40) are used. Arm assembly can be fixed or moved to three different positions relative to boring bar (FIG. 2) by manipulating a hand knob (36). A moveable and replaceable cutting tool (198) is held at the end of the arm assembly. A wall thickness caliper system (44) which ends in a tip (130) of some flexible material to allow operator appraisal of the internally disposed cutting tool's position. A back restraint assembly (141) is used to prevent the downward pitch of the boring bar's cutting end during material removal and consequent upward pitch of the opposite end of the boring bar, and especially during a highly leveraged cutting action. An outrider (38) attached to the boring bar prevents rotational movement of the tool relative to its longitudinal axis, especially during a leveraged offset cutting action. The outrider is able to be attached at several different locations on the boring bar and also serves as the support for the caliper system. Platform base (34B) is mounted rigidly to the lathe bed (30) and maintains platform assembly (34A) at a proper height. A precise wall thickness that mirrors the outside form can be achieved with this system. The system can be used to hollow-out forms not possible with previous practice. A narrow and restricted mouth opening does not hinder hollowing-out large diameters and deep forms. The operator is in control during all leveraged cutting actions and experiences minimal operator fatigue.
REFERENCES:
patent: 4345631 (1982-08-01), Lemler
patent: 4615365 (1986-10-01), Arnall
patent: 4830069 (1989-05-01), Milyard
patent: 4924924 (1990-05-01), Stewart
patent: 5224529 (1993-07-01), Kenny
patent: 5333657 (1994-08-01), Hart
patent: 5441089 (1995-08-01), Lazarou
Pitts Andrea L.
Williams Mark
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