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US3690782A Expired / Lapsed US ⏱️ 0.0 years remaining

Lead-screw tapping head

Assignee: Individual
•
Filing: 1969-06-27
•
Granted: 1972-09-12
•
Expires: 1989-06-27
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Abstract

Abstract Lead screw tapping apparatus for guiding and feeding a threading tool into a workpiece. The apparatus comprises an axially movable quill within which is rotatably mounted a spindle holding the threading tool. The quill is rapidly advanced and retracted from the proximity of the workpiece by means of supplied superatmospheric gas pressure acting on a piston fixedly mounted on the quill. The rapid advancement of the quill engages a clutch element, attached to a lead screw, with a corresponding clutch element rotated by a drive means, thereby advancing an associated lead nut having threads of the same pitch of the threads formed by the tool, while simultaneously rotating the spindle and threading tool. The quill (to which the lead nut is secured) the spindle and the threading tool are advanced at the same rate, the tool thus forming the threads in the workpiece. Obstacles or forces encountered during the threading operation which are greater in magnitude than the total resultant force produced by the preselected gas pressure acting on the piston disengage the clutch surfaces thereby stopping the operation and saving the threading tool from destruction.

Inventors

  • 👤 Robert J Petroff

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 15:35
CPC Classifications
B; B23; B23G; B23G1/00; B23G1/16; Y; Y10; Y10T; Y10T408/00; Y10T408/65; Y10T408/675; Y10T408/6771; Y10T408/6793; Y10T408/70; Y10T408/72

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 151 words
Lead screw threading apparatus for guiding and feeding a threading tool toward and into a workpiece comprising, in combination, a frame, rotatable drive means secured to said frame and including a first clutch element, a non-rotatable hollow cylindrical quill mounted for axial movement relative to said frame, a spindle rotatably mounted in said quill, a lead screw nut fixedly attached to said quill, a lead screw threadably received in said lead screw nut and keyed to said spindle as to permit the spindle to move axially relative to said lead screw during the threading operation, a second clutch element secured to said lead screw, and means for affecting unitary axial movement of said quill, said spindle, said lead screw nut, said lead screw and said second clutch element toward the workpiece to engage said first and second clutch elements and thereby place said spindle in driven relation with said drive means.
Claim 2
Dependent Claim 151 words
Lead screw threading apparatus for guiding and feeding a threading tool toward and into a workpiece comprising, in combination, a frame, rotatable drive means secured to said frame and including a first clutch element, a non-rotatable hollow cylindrical quill mounted for axial movement relative to said frame, a spindle rotatably mounted in said quill, a lead screw nut fixedly attached to said quill, a lead screw threadably received in said lead screw nut and keyed to said spindle as to permit the spindle to move axially relative to said lead screw during the threading operation, a second clutch element secured to said lead screw, and means for affecting unitary axial movement of said quill, said spindle, said lead screw nut, said lead screw and said second clutch element toward the workpiece to engage said first and second clutch elements and thereby place said spindle in driven relation with said drive means.
Claim 3
Dependent Claim 97 words
Apparatus in accordance with claim 1 in which said means for effecting unitary axial movement comprises a chamber surrounding at least a portion of said quill, a piston in said chamber secured to said quill, and means supplying compressed gas to said chamber at a preselected superatmospheric pressure, whereby said spindle is urged toward the workpiece with a force proportional to said preselected superatmospheric pressure, thereby establishing the maximum axial force exertable against the workpiece by a threading tool held on said spindle, and also establishing the maximum torque transmissible between said first and second clutch elements.
Claim 4
Dependent Claim 63 words
Lead screw apparatus in accordance with claim 1 in which the unitary axial movement of said quill, said spindle, said lead screw nut, said lead screw and said second clutch element is between a first position remote from the workpiece and a second position closer to the workpiece, said clutch elements being disengaged in said first position and engaged in said second position.
Claim 5
Dependent Claim 40 words
Lead screw tapping apparatus in accordance with claim 3 in which said quill, said spindle, said lead screw nut, said lead screw and said second clutch element are adapted for rapid movement between said first position and said second position.

References Cited (Backward Citations)

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USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-09-12 1976-03-13 1976-09-12 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-09-12 1980-03-13 1980-09-12 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-09-12 1984-03-13 1984-09-12 $7700.00 Window Closed / Lapsed

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