WO1999039856A1 - Pieces et sous-ensembles ameliores pour mandrins porte-tarauds a renversement automatique de marche - Google Patents

Pieces et sous-ensembles ameliores pour mandrins porte-tarauds a renversement automatique de marche Download PDF

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Publication number
WO1999039856A1
WO1999039856A1 PCT/US1999/002851 US9902851W WO9939856A1 WO 1999039856 A1 WO1999039856 A1 WO 1999039856A1 US 9902851 W US9902851 W US 9902851W WO 9939856 A1 WO9939856 A1 WO 9939856A1
Authority
WO
WIPO (PCT)
Prior art keywords
drive
set forth
spline
drive spline
tap
Prior art date
Application number
PCT/US1999/002851
Other languages
English (en)
Inventor
Allan S. Johnson
Original Assignee
The Tapmatic Corporation
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 The Tapmatic Corporation filed Critical The Tapmatic Corporation
Publication of WO1999039856A1 publication Critical patent/WO1999039856A1/fr

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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

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 oy a driving machine or a power center, and to components for such tools
  • tapping attachments including a tap holding spindle ana simultaneously rotating forward ana reverse a ⁇ vers, the spindle being freely floating and moveable axially with respect to the forward and reverse drivers Under forward drive in which the tap holder spindle is driven by the forward driver, the tap threads a hole being tapped in the workpiece and thereby screws itself into the hole
  • the tap holding spindle and the driver memoers Under cessation of feed by the driving machine with retraction of the driving machine relative axial movement results between the tap holding spindle and the driver memoers 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 Decome fastened to the workpiece
  • the reverse drive member oecomes engaged with the tap holding spindle causing reverse rotation thereof and thereDv 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
  • 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 ⁇ ve to the forward and reverse drive means driver subassemolies including removable drive elements elements being contained in a ⁇ isassemDieaole housing a removapie ⁇ ve element cornp ⁇ sing a drive spline disposed on a connector nestable in a receptacles defined in drivers.
  • driver subassemolies including removable drive elements elements being contained in a ⁇ isassemDieaole housing a removapie ⁇ ve element cornp ⁇ sing a drive spline disposed on a connector nestable in a receptacles defined in drivers.
  • a plurality of d ⁇ v ⁇ splines are mounted on a holder nestable in receptacle defined in drivers.
  • 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 partial sectional view of a drive component receptacle in accordance with the invention, through line 3-3 of Fig. 2,
  • Fig. 4 is an enlarged view of a portion of Fig 3 above;
  • Fig. 5 is a top view of a removable drive element in accordance with the invention, in the receptacle of Fig 3,
  • Fig. 6 is a top view of a removable drive component in accordance with the invention.
  • Fig. 7 is a side view of a removable drive component in accordance with the invention.
  • Fig. 8 is a sectional view through the line 8-8 of a removable drive component in accordance with the invention.
  • Fig. 9 is a perspective view of a portion of a removable drive component in accordance with the invention.
  • Fig 10 is a perspective view of a receptacle for accommodating a removable drive component in accordance with the invention
  • Fig 11 is a top view of an alternative embodiment of a drive comDonent holder in accordance with the invention
  • Fig 12 is a top view of an alternative removable drive component in accordance with the invention.
  • Fig. 13 is a perspective view of the drive component receptacle depicted in Fig. 11 ,
  • Fig. 14 is a perspective view of the drive component of Fig. 12,
  • Fig. 15 is a top view of the drive component of Fig 12 in a receptacle of Fig. 11 , in accordance with the invention.
  • 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 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 element 16a of tapping attachment 10 when connected to the driving machine
  • the driving machine causes rotation of shank 12 and the driving parts within housing 16
  • Upper housing element 16a which is restrained by stem 14, is secured to a lower housing element 16b through a pe ⁇ metral region of a gear carrier 46 described in further detail hereinbelow
  • Housing elements 16a, 16b define a central bore 17 for receiving a drive spindle memDer 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 memoer 30 is assembled with spring members 32 retained by a cap 34
  • a gear 40 comprises an upper gear member 42 and a lower ⁇ ear memoer 44
  • a gear earner 46 is secured between housing element 16a and housing element 16b. Securement is by bolts (not shown) disposed in bolt holes (not shown) defined in gear carrier 46
  • a plurality of planet gears 48 (depicted as three in number) are mounted in planet gear earner 46
  • Planet gears 48 are engageable with gear 40
  • a forward drive member of generally annular configuration defines a central bore 52
  • Forward drive member 50 is engageable with upper gear 42 and carries fittings 56
  • Along its inner periphery drive member 50 defines at least one drive component holder in the form of at least one drive spline member receptacle 59 (shown as three in number) for receiving removable drive components in the form of removable spline members 53
  • Each spline member 53 is configured to fit matingly into receptacle 59
  • Spline member 53 includes a connector 77 on which a spline 54 is disposed, connector 77 being configured to fit into receptacle 59
  • Spline 54 may be of any desired configuration Examples of desirable configurations are disclosed in U S Patent Nos 5,131 ,794 and 5,209,616 assigned to the assignee of the present application.
  • spline 54 is generally pentahedral including an upper surface 70 and lateral segments 72, 74 which are connected, respectively, to ramp members 80, 81 on connector 77, lateral segments 72, 74 being inclined at acute angles to the path of a drive ball 82 providing a cushioning effect upon driving contact between segments 72, 74 and drive ball 82
  • Opposite upper surface 70 is a lower surface 73
  • a contact face 75 defined by edges of segments 70, 72, 73, 74 has a concave curvature This configuration contributes to cushioning of impact between spline 54 and drive balls 82
  • Receptacles 59 are configured to accommodate spline member 53
  • Each receptacle 59 includes lateral segments 60 62, an outer segment 64, and a top opening 66, and a lower segment 67 (For purposes of the instant application the term “outer” means and refers to the direction away from the center of member 52)
  • a screw hole 78 is defined in outer segment 64
  • a reverse drive member 84 is engageable with lower gear 44.
  • Member 84 is identical to forward drive member 50, as are asso ⁇ ated parts and components
  • Severe stress is imposed upon splines 54 in operation of tapping attachment 10 in connection with which splines 54 perform driving functions
  • the removeability 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 spline members 53 are replaced with new ones whereas in existing devices the entire part 50 requires replacement
  • splines members 54 are indexed, i e , symmetrical- thus, wear can be equalized to prolong useful life by periodically rotating spline members 53
  • Splines 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 53 may be fabricated in a variety of ways They may be machined, sintered or forged This also provides an 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 53 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 b ⁇ ttleness of the whole part
  • removable splines 53 may be fabricated from different material than the part in which they are mounted
  • 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 earner.
  • coatings such as titanium may be applied to removable splines 53 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
  • a receptacle 92 for spline member 90 is defined in a forward drive member 94
  • receptacle 92 comprises a plurality (shown herein as three) of pockets 96a, 96b, 96c defined in the inner periphery of drive member 94
  • Pockets 96a, 96b, 96c are of generally in semi-rectangular configuration, having openings 98a, 96b, 98b, 98c at the top of pockets 96a, 96b, 96c, respectively Screw holes 99a, 99b, 99c are defined in pockets 96a, 96b, 96c, respectively
  • Drive spline member 90 comprises a retainer member 100 on which are mounted drive splines 102a, 102b, 103c. The latter are shaped to conform to, and fit into pockets 98a, 98b, 98c. Defined in spline members 102a, 102b, 102c are screw holes 104a, 104b, 104c alignable with screw holes 99a, 99b, 99c defined in drive member 94 Drive member 94 carries fittings 108
  • Drive spline member 90 is installed in forward drive member 94 by aligning the individual drive splines 102a, 102b, 102c with pockets 98a, 98b, 98c and then placing drive spline member 90 into fitting engagement with drive member 94 Screws then are employed to fasten drive spline member 90 to drive member 94

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Plates (AREA)

Abstract

La présente invention concerne un mandrin porte-taraud à renversement automatique de marche (10) comprenant: un tourillon porte-taraud (30), un organe d'entraînement vers l'avant (50) qui entraîne le tourillon porte-taraud (30) vers l'avant et un organe d'entraînement inverse (84) qui entraîne le tourillon porte-taraud (30) dans une direction inverse, l'organe d'entraînement vers l'avant (50) et l'organe d'entraînement inverse (84) comprenant au moins un réceptacle (59) destiné à recevoir au moins une cannelure d'entraînement fixée amovible (53), et un mécanisme de vis (79) permettant de fixer amovibles les cannelures d'entraînement (53) à l'organe d'entraînement vers l'avant (50) et à l'organe d'entraînement inverse (84).
PCT/US1999/002851 1998-02-09 1999-02-09 Pieces et sous-ensembles ameliores pour mandrins porte-tarauds a renversement automatique de marche WO1999039856A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7409598P 1998-02-09 1998-02-09
US60/074,095 1998-02-09

Publications (1)

Publication Number Publication Date
WO1999039856A1 true WO1999039856A1 (fr) 1999-08-12

Family

ID=22117701

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1999/002851 WO1999039856A1 (fr) 1998-02-09 1999-02-09 Pieces et sous-ensembles ameliores pour mandrins porte-tarauds a renversement automatique de marche

Country Status (1)

Country Link
WO (1) WO1999039856A1 (fr)

Citations (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
US4277209A (en) * 1979-12-03 1981-07-07 Erickson Tool Company Threading attachment
US4832542A (en) * 1987-04-08 1989-05-23 Tapmatic Corporation Clutching means adapted for tapping attachment
US5131794A (en) * 1991-06-27 1992-07-21 Tapmatic Corporation Dog drive for tapping attachments

Patent Citations (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
US4277209A (en) * 1979-12-03 1981-07-07 Erickson Tool Company Threading attachment
US4832542A (en) * 1987-04-08 1989-05-23 Tapmatic Corporation Clutching means adapted for tapping attachment
US5131794A (en) * 1991-06-27 1992-07-21 Tapmatic Corporation Dog drive for tapping attachments

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