Electricity: motive power systems – Plural diverse motor controls – Motor-reversing
Patent
1974-05-01
1977-01-11
Dobeck, B.
Electricity: motive power systems
Plural diverse motor controls
Motor-reversing
318432, 318490, 318480, B23Q 528
Patent
active
040029603
ABSTRACT:
A threading and/or tapping device has a housing including a tubular portion and a chamber portion that provides a shelf for a motor. A shaft rotatably connected to a slide within the tubular portion extends downwardly through the chamber portion with a tool holder on its exposed end. The slide is movable by the operator to advance and retract the shaft and a gear train within the chamber includes a drive gear on the motor shaft and a driven gear through the axis of which the tool holder shaft extends to rotate therewith and to slide relative thereto as the operator advances or retracts the shaft. The housing includes means for detachably attaching it with the work holder shaft either normal to or axially aligned with a support. Means are provided to maintain, by a tachometer feedback control, a selected motor speed and a trip is provided to interrupt the operation of the motor if a predetermined maximum torque is exceeded, the torque being visually presented to enable the operator to so control the advance of the tool that overcutting at its leading or trailing edges may be substantially eliminated by maintaining the torque within an optimum range.
REFERENCES:
patent: 3371257 (1968-02-01), Warren et al.
patent: 3371258 (1968-02-01), Brown
patent: 3404490 (1968-10-01), Estabrook
patent: 3411063 (1968-12-01), Schoonover
patent: 3497786 (1970-02-01), Lombardo
patent: 3549972 (1970-12-01), Callan
patent: 3699411 (1972-10-01), Miller
Brookfield Richard A.
Ritzinger Karl R.
Brookfield Engineering Laboratories, Inc.
Dobeck B.
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