The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 11, 1977
Filed:
May. 01, 1974
Richard A Brookfield, Newton, MA (US);
Karl R Ritzinger, Manchester, NH (US);
Brookfield Engineering Laboratories, Inc., Stoughton, MA (US);
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.