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
  • B23B31/1207—Chucks with simultaneously-acting jaws, whether or not also individually adjustable moving obliquely to the axis of the chuck in a plane containing this axis
  • B23B31/1215—Details of the jaws
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
  • Y10T279/00—Chucks or sockets
  • Y10T279/17—Socket type
  • Y10T279/17615—Obliquely guided reciprocating jaws
  • Y10T279/17623—Threaded sleeve and jaw
  • Y10T279/17632—Conical sleeve

Definitions

• the present invention relates to a tool chuck for the equipment of a rotary machine.
• the clamping of a tool on a mandrel is achieved by jaws, generally three in number, offset angularly by 120 ° relative to each other.
• the jaws are convergent towards the front of the mandrel, and are movable in a direction of approximation to each other to achieve the clamping of a tool, and in a direction of recoil, corresponding to a spacing to release the tool.
• This axial displacement of the jaws which is accompanied by a radial displacement, also makes it possible to adapt the spacing between the jaws to the diameter of the tool that should be tightened.
• the body of the mandrel comprises cavities of generally cylindrical shape, for guiding jaws of complementary shape.
• the jaws which have a generally cylindrical shape in their guide zone inside the mandrel have ends of different shapes, including tapered ends having an edge facing inwards, so that the clamping on the tool is made at three edges belonging to the three jaws.
• the object of the invention is therefore to provide a mandrel whose jaws are made simply and economically.
• the chuck which it concerns, of the type comprising a body inside which are mounted, guided in translation, several jaws converging forward to achieve the clamping of a tool, each jaw having a toothing facing outwards or inwards, intended to cooperate with a drive member situated outside or inside, is characterized in that:
• each jaw has a rectangular section, and is guided in a complementary profile groove in the body, The orientation of each jaw is such that its inward facing face is situated in a plane substantially tangential to a circle centered on the axis of the mandrel,
• Each jaw is positioned in the body so that the longitudinal median plane of its inward facing face is offset from the nip on a circle centered on the axis of the mandrel and representative of the tail of the mandrel. a tool, so as to make contact with this circle at an edge, said active edge, delimiting this inner face, and located forward or tangent in the clamping direction.
• Each jaw having a rectangular section can be obtained in a simple manner, for example by cutting a metal plate of suitable thickness, corresponding to the thickness of the jaws. It is also possible to obtain this type of jaw by simple operations such as forging operations.
• the rectangular shape of the jaws nevertheless allows a clamping along the edges, the offset positioning of the jaws, as specified above, allowing contact with the tail of the tool along a so-called active edge edge delimiting the inner face of each bit. It may be noted that if it is a question of tightening the tail of a tool of hexagonal shape, the three inner planar faces, rest on three of the six faces of the tool and ensure a perfect tightening thereof.
• the face of each jaw turned inward forms an angle of a few degrees, on the outside, with the tangent to a circle centered on the axis of the mandrel, passing through the point of contact between the active edge and this circle.
• This feature ensures the clamping of a circular tool shank along three edges corresponding to the active edges of the inner face of the three jaws.
• the toothing of each jaw is defined by cuts having walls perpendicular to the longitudinal plane of the jaw.
• This feature is advantageous in that the teeth are obtained in a simple manner, by simple cutting, and can nevertheless mesh with a thread, this thanks to the offset of the position of the jaws, by relative to a position in which the longitudinal plane of each jaw would pass through the axis of the mandrel.
• each jaw has in at least one of its lateral faces, at least one longitudinal groove, in which is intended to be engaged at least one stud projecting from the face facing the wall of the groove in which the jaw is engaged and guided.
• the toothing of each jaw is formed on the face of the jaw turned inwards and cooperates with a central head threaded with a step to the left to obtain the movement of the jaws in one direction or the other according to the direction of rotation of the body and the head.
• the toothing of each jaw is formed on the face of the jaw turned outwardly and cooperates with an outer nut driven by a casing pivotally mounted on the body.
• Figure 1 is a perspective view in the clamping position of a tool whose tail has a hexagonal section
• Figure 2 is a front view of the mandrel of Figure 1;
• Figure 3 is a perspective view of two jaws of the mandrel, in the clamping position of the same tool, the outside of the mandrel has been torn off;
• Figure 4 is a front view of the mandrel in the clamping position of a cylindrical drill;
• Figure 5 is a longitudinal sectional view, along line V-V of Figure 4.
• the mandrel shown in Figures 1 to 5 comprises a body 2 inside which is mounted a central head 3 for attachment to the shaft of a rotating machine, the central head 3 comprising in its front part an external thread 4
• This mandrel is equipped with a retaining ring 5 integral with the central head, as well as in its front part with a clamping ring 6.
• the body 2 has three longitudinal recesses of rectangular section, each serving for mounting and guiding of a bit 7.
• each of the jaws has a rectangular section, which allows to obtain in a simple manner, for example, by cutting into a plate of predetermined thickness.
• Each of the jaws has, on its face turned inwards, toothing 8 obtained by cuts having walls perpendicular to the longitudinal plane of the jaws.
• each jaw comprises, in one of the lateral faces, a longitudinal groove 9, in which is intended to be engaged at least one protruding stud facing the wall of the groove in which is engaged and guided the bit considered.
• each jaw is located in a plane substantially tangential to a circle 12 centered on the axis of the mandrel.
• each jaw is positioned in the body so that the longitudinal median plane P of its face 10 is offset relative to its line of contact on a circle centered on the axis of the mandrel and representative of the tail of a tool. In this way, the contact with the circle is made at an edge 13 called active edge, which is located forward or tangent in the clamping direction of the tool.
• the clamping is done by pressing the three inner faces 10 of the jaws on three sides of the shank 15 of the tool.
• the clamping of the tail 17 is formed at the three active edges 13 of the three jaws.
• the invention provides a great improvement to the existing technique by providing a mandrel of simple structure, insofar as the jaws it comprises can be obtained by mechanical operations or by operations of forging very simple and inexpensive.
• the invention is not limited to the single embodiment of mandrel comprising a threaded central head with a left-hand step, but embraces all the variants thereof. It is thus that the teeth of each jaw could be arranged on the face of the jaw turned outwardly and cooperate with an outer nut driven by a casing pivotally mounted on the body, without we go out of the frame of the invention.

Landscapes

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

Applications Claiming Priority (2)

Publications (1)

Family

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Family Applications (1)

Country Status (6)

Families Citing this family (4)

Family Cites Families (30)

• 2005
  • 2005-03-16 FR FR0502588A patent/FR2883209B1/fr not_active Expired - Fee Related
• 2006
  • 2006-03-16 JP JP2008501374A patent/JP2008532785A/ja not_active Withdrawn
  • 2006-03-16 EP EP06743587A patent/EP1858665A1/fr not_active Withdrawn
  • 2006-03-16 CN CNA200680008145XA patent/CN101189091A/zh active Pending
  • 2006-03-16 US US11/885,502 patent/US20090140500A1/en not_active Abandoned
  • 2006-03-16 WO PCT/FR2006/000589 patent/WO2006097637A1/fr active Application Filing

Non-Patent Citations (1)

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