WO1993006958A1 - Dispositif d'accouplement ameliore a clavette et a mors superieur - Google Patents

Dispositif d'accouplement ameliore a clavette et a mors superieur Download PDF

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Publication number
WO1993006958A1
WO1993006958A1 PCT/US1992/002762 US9202762W WO9306958A1 WO 1993006958 A1 WO1993006958 A1 WO 1993006958A1 US 9202762 W US9202762 W US 9202762W WO 9306958 A1 WO9306958 A1 WO 9306958A1
Authority
WO
WIPO (PCT)
Prior art keywords
jaw
pin
pair
base
aperture
Prior art date
Application number
PCT/US1992/002762
Other languages
English (en)
Inventor
James R. Jagger
Original Assignee
D L & J, Inc.
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
Priority claimed from US07/774,826 external-priority patent/US5163693A/en
Application filed by D L & J, Inc. filed Critical D L & J, Inc.
Publication of WO1993006958A1 publication Critical patent/WO1993006958A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23B—TURNING; BORING
    • B23B31/00—Chucks; Expansion mandrels; Adaptations thereof for remote control
    • B23B31/02—Chucks
    • B23B31/10—Chucks characterised by the retaining or gripping devices or their immediate operating means
    • B23B31/12—Chucks with simultaneously-acting jaws, whether or not also individually adjustable
    • B23B31/16—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving radially
    • B23B31/1627—Details of the jaws
    • B23B31/16279—Fixation on the master jaw

Definitions

  • the instant invention relates generally to top jaws for use on chucks on lathes, milling machines and the like and more particularly to top jaws which can be easily and rapidly interchanged without removing the means by which the top jaw is attached to the chuck.
  • chucks on milling machines, lathes or the like typically have channels cut into their outer surface. These channels extend radially outward from the center of the chuck. Master jaws are placed in the channels and attached to hydraulic means for moving the master jaws along the channels. These master jaws typically have inverted T-shaped channels extending along their lengths for receiving and securing jaw nuts which are in turn connected to the top jaws. A jaw nut corresponding in shape to the inverted T- shaped channel of the master jaw is slid along the master jaw to a desired position on the chuck. A top jaw is typically placed on the top surface of the jaw nut above the plane of the outer surface of the chuck.
  • Removable bolts extend downward through the top jaw into threaded recesses in the jaw nut.
  • the top jaw is drawn downward into contact with the top surface of the master jaw while the jaw nut is drawn upward into contact with channel in the master jaw. This process locks the top jaw in position on the master jaw.
  • these bolts are removed allowing the top jaw to be pulled away from contact with the upper surface of the jaw nut and master jaw.
  • a new top jaw is positioned above the jaw nut and bolts are passed through the top jaw into contact with the threaded recesses in the jaw nut.
  • a base or intermediate jaw comprising a bottom portion and a wedge portion is provided.
  • the bottom portion includes a lower surface adapted to receive a conventional jaw nut and to be fitted upon a master jaw.
  • a plurality of apertures extend downward through the bottom portion.
  • Removable bolts extend downward and are inserted through the apertures into threaded recesses in the jaw nut to secure the base jaw to the master jaw.
  • the base jaw is drawn downward into contact with the top surface of the master jaw while the jaw nut is drawn upward into contact with the channel in the master jaw. This process locks the base jaw in position on the master jaw.
  • the base jaw also includes a wedge or top portion attached to the top surface of the bottom portion.
  • the wedge portion includes an aperture defining a pair of flat angled contact faces and a bottom surface.
  • the contact faces extend entirely across the surface of the wedge portion.
  • the contact faces extend upward at one end from the bottom surface at acute angles relative to the bottom surface until they meet at their opposite ends.
  • a top jaw having a slot corresponding in size to the wedge portion of the base jaw is provided. The top jaw is placed on the base jaw so that the wedge portion extends upward into the slot of the top jaw and the bottom surface of the top jaw is resting on the top surface of the bottom portion of the base jaw.
  • the top jaw has a pin aperture extending through the slot parallel to the angled contact faces of the wedge portion.
  • a pin having a plurality of flat angled surfaces along its longitudinal length is placed through the pin aperture in the top jaw.
  • top jaws With the prior art top jaws about ten minutes was needed to change the top jaws. With the instant invention, considerably less time is needed to change top jaws. Further, because there is no need for precise alignment of bolts and recesses, the ease with which top jaws are exchanged is greatly improved.
  • a top jaw system which allows one top jaw to be easily exchanged with another top jaw. It is another object of the instant invention to provide a top jaw which may be rapidly exchanged with another top jaw. It is a further object of the instant invention to provide a top jaw which may be easily aligned along the master jaw. It is a further object of the instant invention to provide a top jaw which is inexpensive and easy to manufacture.
  • Fig. 1 is a perspective view of the instant invention
  • Fig. 2 is front view of the intermediate jaw of the invention of Fig. 1
  • Fig. 3 is a side view of the intermediate jaw of the invention of Fig. 1
  • Fig. 4 is a front view of the top jaw secured to the intermediate jaw of the invention of Fig. 1
  • Fig. 5 is a side view of the top jaw secured to the intermediate jaw of the invention of Fig. 1
  • Fig. 6 is a rear elevational view of the invention of Fig. 1 in position on a master jaw attached to a chuck
  • Fig. 1 is a perspective view of the instant invention
  • Fig. 2 is front view of the intermediate jaw of the invention of Fig. 1
  • Fig. 3 is a side view of the intermediate jaw of the invention of Fig. 1
  • Fig. 4 is a front view of the top jaw secured to the intermediate jaw of the invention of Fig. 1
  • Fig. 5 is a side view of the top jaw secured to the intermediate jaw
  • FIG. 7 is a perspective view of the jaw nut used in connection with the invention of Fig. 1;
  • Fig. 8 is a perspective view of the top jaws in position on a chuck.
  • DETAILED DESCRIPTION OF THE INVENTION As required, detailed embodiments of the present invention are disclosed herein, however, it is to be understood that the disclosed embodiments are merely exemplary of the invention which may be embodied in various forms. Therefore, specific functional and structural details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention in virtually any appropriately detailed structure. Referring now to the drawings, the present invention is generally shown in Figures 1-8.
  • a top jaw 18 is positioned on an intermediate or base jaw generally numbered as 50.
  • Base jaw 50 is mounted to a conventional jaw nut 12 as will be more fully described below.
  • Extending flanges 13 are integrally formed with jaw nut 12.
  • Jaw nut 12 and extending flanges 13 are shaped as is common in the art to conform to the inverted "T"-shaped channel of a master jaw 4 on a chuck 5 ( Figure 6) .
  • Top jaw 18 is mounted to master jaw 4 through base jaw 50 and jaw nut 12.
  • Top jaw 18 has at least one work piece end 26 configured to contact and hold a work piece when top jaw 18 is attached to master jaw 4.
  • Master jaw 4 is recessed into a groove in chuck 5 of a lathe or similar device.
  • Top jaw 18 is provided having an elongated slot 27 extending into top jaw 18 from the side of the top jaw 18 directed toward the chuck.
  • the elongated axis of slot 27 is parallel to the axis of master jaw 4 when top jaw 18 is in position on master jaw 4 as will be described.
  • a pin aperture 22 extends entirely through top jaw 18 passing through slot 27 at a right angle to the elongated axis of slot 27.
  • a pin 30 is also provided as will be described in detail hereafter.
  • Base jaw 50 is provided with two mounting apertures 58 and 60. However, it is to be understood that the instant invention is not limited to two apertures.
  • Jaw nut 12 includes threaded recesses 15 and 17, which, after base jaw 50 has been accepted by jaw nut 12, will be aligned with mounting apertures 58 and 60.
  • Removable mounting bolts 51 and 53 are received within apertures 58 and 60 and threaded recesses 15 and 17 in order to securely mount base jaw 50 to jaw nut 12 and master jaw ' 4.
  • Mounting apertures 58 and 60 extend through bottom member from a top surface 55 to the jaw nut receiving channel 54. The diameter of mounting apertures 58 and 60 is smaller at the jaw nut receiving channel 54 than at top surface 55.
  • Base jaw 50 includes generally a rectangular bottom member 52 and a top member 62.
  • Bottom member 52 contains a series of serrations 56 along its lower surface. These serrations 56 comprise essentially right-triangular protrusions arranged in parallel along the lower surface of bottom member 52 and extending across the downwardly extending legs 53 of bottom member 52. Serrations 56 correspond in size and shape to right-triangular serrations (not shown) on master jaw 4.
  • the serrations of master jaw 4 extend into the corresponding triangular shaped spaces between serrations 56 of base jaw 50, thereby preventing base jaw 50 from moving forward or backward in a direction perpendicular to serrations 56.
  • serrations 56 of base jaw 50 are brought into contact with the serrations of master jaw 4, thereby positioning base jaw 50 on master jaw 4 within the tolerance of the spacing between serrations 56.
  • Removable mounting bolts 51 and 53 are inserted through mounting apertures 58 and 60 of base jaw 50 and threaded recesses 15 and 17 of jaw nut 12. Tightening removable mounting bolts 51 and 53 brings them into physical contact with the reduced diameters of mounting apertures 58 and 60 thereby securely fastening base jaw 50 to jaw nut 12.
  • Base jaw 50 further includes a wedge portion 62 integrally formed or machined with the bottom portion 52 of base jaw 50.
  • Wedge 62 has a back 63 on one end and aperture 64 extending through wedge 62.
  • Aperture 64 defines a pair of angled contact faces 66 and 68 and a bottom surface 67.
  • Contact faces 66 and 68 are flat and extend entirely across the surface of wedge 62.
  • Contact faces 66 and 68 extend upward at one end from bottom surface 67 of aperture 64 at acute angles relative to bottom surface 67 until they meet at 69 of Figure 1.
  • Slot 27 is slightly larger in length and approximately the same width as wedge 62.
  • top jaw 18 is placed over wedge 62 so that wedge 62 extends into slot 27.
  • Pin 30 has a pair of flat angled faces 34 and 35 extending entirely along the length of pin 30.
  • Pin 30 also has a pin head 32 which is larger in cross sectional circumference than pin 30.
  • Pin 30 is manually pushed through pin aperture 22 so that pin head 32 comes into contact with the outside surface of top jaw 18. Contact between pin head 32 and top jaw 18 prevents pin 30 from passing entirely through pin aperture 22.
  • Each master jaw 4 on the chuck is attached to hydraulic devices, as is common in the art, for moving master jaws 4 along the recesses in the chuck. The movement of master jaw 4 by its respective hydraulic device pushes wedge 62 toward pin 30. Because of the angled contact face 66 or 68 of wedge 62, wedge 62 tends to rise upward with respect to pin 30. This upward movement causes jaw nut 12 to also move upward. This upward movement of jaw nut 12 moves flanges 13 into contact with the corresponding channels of master jaw 4. This brings jaw nut 12 into solid and secure contact with master jaw 4.
  • the work piece will be located at the center of the chuck so that master jaws 4 will move toward the center of the chuck thereby pushing work piece end 26 of top jaw 18 into contact with the workpiece.
  • work piece end 26 may be directed away from the center of the chuck and master jaws 4 move outward of the chuck allowing the inside surface of the work piece pipe or similar item to be grasped.
  • No serrations are present on legs 23 and 25 of top jaw 18 and top surfaces 57 and 59 of bottom member 52 in order to enhance the slidability of top jaw 18 and, thus, increase the locking force.
  • base jaw 50 and pin 30 are hardened and titanium nitrate coated to add lubricity between base jaw 50 and top jaw 18 to further assure a smooth operation between base jaw 50 and top jaw 18. Therefore, the movement of master jaw 4 will cause pin 30 to contact one of the contact faces 66 or 68 and securely position the device above master jaw 4, as described above. Accordingly, the movement of master jaw 4 outward will cause pin 30 to contact the other of the two contact faces 66 or 68, which will produce the same effect on the device as when moving master jaw 4 inward. When it is desired to replace top jaw 18 with an alternative top jaw, the pressure on pin 30 is reduce 10
  • top jaw 18 may be lifted

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

On décrit un système permettant de fixer un mors supérieur (18) en position au-dessus d'un mandrin (5) sur une fraiseuse, un tour d'usinage ou dispositif analogue. Le système comprend généralement un mors inférieur (50), un mors supérieur (18) et un mors principal (4) ainsi qu'un écrou (12) à mors classique. Le mors inférieur (50) comprend une partie inférieure (52) et une partie clavette (62). Le mors supérieur (18) est fixé amovible à la partie clavette (62) par une cheville (30), alors que la partie inférieure (52) est fixée amovible à l'écrou (12) à mors par des goujons de montage amovibles (51, 53). L'écrou (12) est disposé dans un canal (54) du mors principal (4). Le mors supérieur (18) peut être rapidement remplacé lorsqu'on enlève la cheville (30).
PCT/US1992/002762 1991-10-11 1992-04-06 Dispositif d'accouplement ameliore a clavette et a mors superieur WO1993006958A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US774,826 1991-10-11
US07/774,826 US5163693A (en) 1991-04-08 1991-10-11 Top jaw and wedge connector

Publications (1)

Publication Number Publication Date
WO1993006958A1 true WO1993006958A1 (fr) 1993-04-15

Family

ID=25102430

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1992/002762 WO1993006958A1 (fr) 1991-10-11 1992-04-06 Dispositif d'accouplement ameliore a clavette et a mors superieur

Country Status (1)

Country Link
WO (1) WO1993006958A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996031308A1 (fr) * 1995-04-06 1996-10-10 Roplan Ab Dispositif de blocage de piece

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029325A (en) * 1975-07-29 1977-06-14 Roehm Guenter H Chuck with radially adjustable jaws
US4667972A (en) * 1983-10-12 1987-05-26 Smw Schneider & Weisshaupt Gmbh Chuck master jaw and false jaw construction
US5076596A (en) * 1991-04-08 1991-12-31 Huron Machine Products, Inc. Top jaw and wedge connector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4029325A (en) * 1975-07-29 1977-06-14 Roehm Guenter H Chuck with radially adjustable jaws
US4667972A (en) * 1983-10-12 1987-05-26 Smw Schneider & Weisshaupt Gmbh Chuck master jaw and false jaw construction
US5076596A (en) * 1991-04-08 1991-12-31 Huron Machine Products, Inc. Top jaw and wedge connector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1996031308A1 (fr) * 1995-04-06 1996-10-10 Roplan Ab Dispositif de blocage de piece

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