WO1999010127A9 - Pieces ameliorees et sous-ensembles pour mandrins porte-tarauds a inversion automatique - Google Patents

Pieces ameliorees et sous-ensembles pour mandrins porte-tarauds a inversion automatique

Info

Publication number
WO1999010127A9
WO1999010127A9 PCT/US1998/017794 US9817794W WO9910127A9 WO 1999010127 A9 WO1999010127 A9 WO 1999010127A9 US 9817794 W US9817794 W US 9817794W WO 9910127 A9 WO9910127 A9 WO 9910127A9
Authority
WO
WIPO (PCT)
Prior art keywords
set forth
drive
gear
spline member
reverse
Prior art date
Application number
PCT/US1998/017794
Other languages
English (en)
Other versions
WO1999010127A3 (fr
WO1999010127A2 (fr
Inventor
Allan S Johnson
Original Assignee
Tapmatic Corp
Allan S Johnson
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tapmatic Corp, Allan S Johnson filed Critical Tapmatic Corp
Publication of WO1999010127A2 publication Critical patent/WO1999010127A2/fr
Publication of WO1999010127A3 publication Critical patent/WO1999010127A3/fr
Publication of WO1999010127A9 publication Critical patent/WO1999010127A9/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G1/00—Thread cutting; Automatic machines specially designed therefor
    • B23G1/44—Equipment or accessories specially designed for machines or devices for thread cutting
    • B23G1/46—Equipment or accessories specially designed for machines or devices for thread cutting for holding the threading tools
    • B23G1/465—Equipment or accessories specially designed for machines or devices for thread cutting for holding the threading tools comprising arrangements for reversing the rotation of the tool
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q5/00—Driving or feeding mechanisms; Control arrangements therefor
    • B23Q5/02—Driving main working members
    • B23Q5/04—Driving main working members rotary shafts, e.g. working-spindles
    • B23Q5/043—Accessories for spindle drives

Definitions

  • the invention relates and pertains to self-reversing tapping attachments i.e. self-reversing tools which carry taps for threading holes and are driven by a driving machine or a power center, and to components for such tools.
  • the tap threads a hole being tapped in the workpiece and thereby screws itself into the hole.
  • relative axial movement results between the tap holding spindle and the driver members such that the forward drive member becomes disengaged from the tap spindle which at this point is held relatively stationary due to the fact that the tap has become fastened to the workpiece.
  • the reverse drive member becomes engaged with the tap holding spindle, causing reverse rotation thereof and thereby unscrewing the tap from the hole.
  • Self-reversing tapping attachments as exemplified in the above-cited patents among others, have particular parts which due to the very nature of self-reversing suffer greater wear than other parts. These parts include elements of the drivers and in particular drive splines and related parts. Replacement of worn parts in existing tapping attachments produces delays and down time. Disassembly of existing tapping attachments in itself requires appreciable time and some degree of skill.
  • Major wear occurs in particular parts which engage to provide forward and reverse rotation of the tap holding spindle. These parts are in the form of splines or dogs. In existing tapping attachments, these splines or dogs are milled/machined in the part when the part is fabricated. As a result, the severe wear which the splines receive and undergo causes premature discarding of entire parts of which the splines are elements.
  • the severe stress which is undergone by the splines causes the parts of which they are components to require ready disassembly and to be removeable from tapping attachment for the replacement due to the wearing-out of the splines and on the basis of economic feasibility are required to assume particular configurations.
  • a self-reversing tapping attachment comprises: tap holding spindle means; forward drive means and reverse drive means for engaging with the tap holding spindle means to impart forward and reverse rotation, respectively, thereto; gear means for transmitting drive to the forward and reverse drive means, driver subassemblies including removable drive elements and cover members for the subassemblies and shock absorbing elements, the foregoing elements being contained in a disassembleable housing.
  • Fig. 1 is a perspective view of a tapping attachment in accordance with the invention
  • Fig. 2 is a sectional view through the line 2-2 of Fig. 1;
  • Fig. 3 is a sectional view, through line 3-3 of Fig. 2;
  • Fig. 4 is a perspective view of driving parts in accordance with the invention.
  • Fig. 5a is a side view of a driving component of a tapping attachment in accordance with the invention.
  • Fig. 5b is a sectional view through line 5b-5b of Fig. 4;
  • Fig. 6 is a top view of a driving component in accordance with the invention.
  • Fig. 7 is a view through the line 7 - 7 of Fig. 6;
  • Fig. 8 is a top view of a driving component in accordance with the invention.
  • Fig. 9 is a sectional view along the line 9-9 of Fig. 8;
  • Fig. 10 is a top view of a driving component in accordance with the invention.
  • Fig. 11 is a top view of a driving component cover in accordance with the invention.
  • Fig. 12 is a top view of an upper section of the cover of Fig. 11;
  • Fig. 13 is a bottom view of a lower section of the cover of Fig. 11;
  • Fig. 14 is a perspective view of a component of a self-reversing attachment in accordance with the invention. DETAILED DESCRIPTION OF A PREFERRED FORM OF THE INVENTION AND PREFERRED METHOD OF PRACTICE.
  • a tapping attachment 10 is coupleable through a shank 12 to a source of rotational drive in the form of a driving machine (not shown) .
  • a stem 14 is disposed in and extends from a closure 15 positioned adjacent an upper housing element 16a of the tapping attachment 10 and is connectable in conventional fashion to the driving machine to provide restraint against rotation of the housing 16 of tapping attachment 10 when connected to the driving machine and to permit rotation under particular circumstances when not so connected.
  • Upper housing element 16a is secured to a lower housing element 16b through a peri etral region of a gear carrier 46 described in detail hereinbelow.
  • Housing elements 16 define a central bore 17 for receiving a drive spindle member 18.
  • a mount 20 having an insert 22 defines a central bore 24.
  • Nut 28 is carried on a tap spindle member 30 for the purpose of holding a tap (not shown) .
  • Spindle member 30 is fastened to a spring member 32 by a cap 34 defining an eye (not shown) from which spring member 32 depends.
  • a gear 40 comprises an upper gear 42 and a lower gear 44.
  • a gear carrier 46 is secured between housing element 16a and housing element 16b. Securement is by bolts (not shown) disposed in bolt holes 47 defined in gear carrier 46.
  • a plurality of planet gears 48 (depicted as three in number) are mounted in planet gear carrier 46. Planet gears 48 are engageable with gear 40.
  • a forward drive member 50 of generally annular configuration, defines a central bore 52. Forward drive member 50 is engageable with upper gear 42. Forward drive member 50 carries fittings 56 and along its periphery defines at least one drive spline receptacle 59 for receiving removable drive spline members 54.
  • Each spline member 54 comprises a head 60 having a pair of symmetrical contact areas 55, joined by an intermediate region 57.
  • Each spline member 54 includes a stem or shaft 58 configured to be received in and secured in receptacles 59. Severe stress is imposed upon spline members 54 in operation of tapping attachment 10 in connection with which spline members perform driving functions.
  • the removability of splines 54 affords flexibility and efficiency of operation of tapping attachment 10: upon failure and/or wearing out of splines 54, the worn out members 54 are replaced with new ones whereas in existing devices the entire part 50 requires replacement.
  • spline members 54 are indexed, i.e. symmetrical; thus, wear can be equalized to prolong useful life by periodically rotating spline members 54.
  • Spline members 54 may be fabricated in any desired shape to accommodate particular applications. For example, the radius of curvature may be adjusted to meet varying conditions of use.
  • Spline members 54 may be fabricated in a variety of ways. They may be machined, sintered or forged. This also provides the advantageous feature with respect to existing devices in that in such devices splines are normally machined as an element of the drive member and due to constraints in manufacturing such fabrication limits flexibility of configuration of. the splines.
  • spline members in accordance with the invention are manufactured separately from the parts on which they are carried, spline members 54 may be separately treated (as by heat treatment) for achieving hardness without requiring the entire part to undergo such hardening treatment. Because such hardness is not necessary for the part carrying splines 54, such hardening of integral splines (requiring the whole part to be heat-treated) is not only unnecessary and uneconomical but also has resulted in compromising the hardness of the splines because hardening the surrounding part to the desirable hardness of splines produces problems of brittleness of the whole part.
  • removable splines 54 may be fabricated from different material than the part in which they are mounted. Thus, different and superior hardness-providing fabrication techniques can be employed to obtain the desired level of this parameter without involving the carrier or any negative side effects such hardening treatment may produce in the carrier.
  • coatings such as titanium may be applied to removeable splines 54 more feasibly than for integral splines in that: the entire part with integral splines would have to be so coated and such a part could be softened by the heat treatment required for coating.
  • section 57 may be formed to be curved to facilitate rolling of drive balls therecross.
  • gear 42 defines slots 62 depicted as three (3) in number. Slots 62 are arcuate and are configured .to receive coil springs 66.
  • Springs 66 are preferably composed of plastic material, such as springs sold under the brand name/trademark Fibroplex. Such plastic springs combine light weight with durability and economy. Of course, other materials may be employed in accordance with the invention.
  • Springs 66 function as shock absorbers for the substantial impacts and stresses experienced by forward drive member 50 and gear 42 during operation of tapping attachment 10. Springs 66 are readily replaceable upon wear by merely removing the worn spring and inserting a new spring in its place.
  • gear 42 is equipped with a gear cover 71.
  • cover 71 is secured by bolting with bolts 65 through bolt holes 67 defined on cover 71 and bolt holes 64 defined in gear 42. Accordingly, when gear 42 receives forward drive member 50 through fittings 56 received in slots 69, securing of cover 71 provides a separate and compact subassembly which is readily installed and removed.
  • the presence of removable splines 54 makes use of such a subassembly feasible in that splines 54 can be replaced upon wearing out or breaking down without need to dismantle the subassembly.
  • a reverse drive member 74 is engageable with lower gear 44.
  • Second drive member 74 is the same as first drive member 50, as are all associated parts and components.
  • Driver 74 and lower gear 44 form together with a gear cover an identical subassembly to the subassembly comprising driver 50, upper gear 42, and gear cover 71.
  • Gear cover 72 is secured by bolts 67 through bolt holes 68.
  • driver 50 engages with a drive sleeve 100 which in turn causes rotation of tap holder 28.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gears, Cams (AREA)
  • Automatic Tool Replacement In Machine Tools (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

Un mandrin porte-tarauds à inversion automatique comprend une broche servant à retenir le taraud, un organe de commande vers l'avant comportant un élément de commande amovible et un organe de commande vers l'arrière comportant un élément de commande amovible afin d'imprimer une rotation respective vers l'arrière et vers l'avant à la broche. Ce mandrin comprend également des sous-ensembles, y compris des engrenages et des organes de commande.
PCT/US1998/017794 1997-08-26 1998-08-25 Pieces ameliorees et sous-ensembles pour mandrins porte-tarauds a inversion automatique WO1999010127A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5718097P 1997-08-26 1997-08-26
US60/057,180 1997-08-26

Publications (3)

Publication Number Publication Date
WO1999010127A2 WO1999010127A2 (fr) 1999-03-04
WO1999010127A3 WO1999010127A3 (fr) 1999-08-05
WO1999010127A9 true WO1999010127A9 (fr) 2001-05-31

Family

ID=22009000

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/017794 WO1999010127A2 (fr) 1997-08-26 1998-08-25 Pieces ameliorees et sous-ensembles pour mandrins porte-tarauds a inversion automatique

Country Status (1)

Country Link
WO (1) WO1999010127A2 (fr)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3717892A (en) * 1970-04-09 1973-02-27 Tapmatic Corp Tapping attachment for numerical control
US4014421A (en) * 1974-11-04 1977-03-29 Tapmatic Corporation Clutching means adapted for use in tapping attachments
US4277209A (en) * 1979-12-03 1981-07-07 Erickson Tool Company Threading attachment
DE4112467A1 (de) * 1991-04-17 1992-10-22 Bilz Otto Werkzeug Gewindeschneidapparat

Also Published As

Publication number Publication date
WO1999010127A3 (fr) 1999-08-05
WO1999010127A2 (fr) 1999-03-04

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