Abstract: A stitch-forming tool assembly for a sewing machine is used to produce a double-chain stitch seam. A sewing needle of the assembly can be driven up and down in a needle stitching direction perpendicular to a material to be sewn and is designed to guide a needle thread. A looper of the assembly is designed to guide a looper thread and for oscillating movement in an oscillating movement plane. The latter is spanned by the needle stitching direction and by a sewing direction along the double chain stitch seam. During an entire double chain stitch a path of movement of the looper lies completely in the oscillating movement plane. This results in a stitch-forming tool assembly in which in particular a looper drive is simplified.

Abstract: A needle member includes: a tubular side wall through which a hollow portion extends in a longitudinal direction. An opening portion connected to the hollow portion extends laterally through the tubular side wall. The tubular side wall comprises a side wall reinforcement portion located at a position opposing the opening portion, wherein the hollow portion is interposed between the opening portion and the side wall reinforcement portion.

Abstract: A sewing machine needle includes a blade extending substantially in the needle's longitudinal direction, an eye, which passes through the needle substantially in its elevational direction, and a scarf, which extends along the needle behind the eye. Compared with the contour of the blade, the scarf contour is recessed in the needle's elevational direction. At least in part of the scarf's extension along the needle, the scarf contour in a sectional plane perpendicular to the needle's longitudinal direction is substantially an arc of a circle. The circular-arc-shaped area covers a first angular portion of the needle's circumference. In this part of the scarf's extension along the needle, the radius of the substantially circular-arc-shaped contour in this first angular portion of the needle's circumference is between 35% and 100% of the needle's maximum lateral reach. The needle's lateral direction is perpendicular to its longitudinal and elevational directions.

Abstract: The present invention relates to a needle instrument for an eye-bag relocating operation. The needle instrument includes a body unit having a rectangular cross-section and grabbed by a needle holder during the operation; a needle unit having one needle side and the other needle side on both sides of the body unit to be tapered and having round tips, wherein one needle side is formed to be duller than the other needle side; and a thread pressing and coupling unit provided on one end of the body unit and formed at a position that corresponds to ? to ? of an entire length from an end of the needle instrument and is spaced apart from the end of the body unit by 0.5 to 1 mm.

Abstract: A method and device for anchoring a length of self-retaining suture. The method of anchoring includes providing for an assembly having a length of self-retaining suture and a suture insertion device. The length of suture includes at least a portion of the length having a plurality of retainers thereon extending in a first direction. The insertion device has a length and a recess to receive a portion of the suture length. The method further includes placing a portion of the suture length in the recess and inserting the device into the body of a mammal until the recess reaches a predetermined location thereby forming an insertion pathway. The method further includes retrieving the insertion device from the body by moving the insertion device in a direction substantially opposed to the insertion pathway.

Abstract: A method for penetrating a material with a fastener dispensing needle includes the steps of partially penetrating the material using a first penetration stroke, partially withdrawing the needle from the material using a first withdrawal stroke and, in turn, fully penetrating the material using a second penetration stroke. Once fully penetrated, a plastic fastener is dispensed from the fastener dispensing needle. Thereafter, the fastener dispensing needle is fully withdrawn from the material. Additional partial penetration and withdrawal strokes could be incorporated into the needle penetration cycle in a repeating pattern, as needed, with each penetration stroke preferably having a stroke length which is twice the length of each withdrawal stroke. The use of an oscillating, back-and-forth, linear needle penetration cycle serves to minimize the risk of lateral needle deflection which can result in bending or breakage of the needle as well as damage to the penetrated material.

Abstract: A surgical trocar 10 has an elongate shaft 12 with a leading point or edge 28 for piercing flesh and a thumb grip region 22 at an inner bend region 18. The grip region may include a flat zone and can be integral with the shaft, optionally stamped or pressed into the material of the shaft.

Abstract: A thin film metallic glass coated needle includes a needle body, a needle head and a thin film metallic glass in amorphous structure and formed on a surface of the needle head and a surface of the needle body to reduce a surface energy and coefficient of friction. The thin film metallic glass is a titanium based comprising 35-45 at % titanium, 5-15 at % zirconium, 32-42 at % copper, 1-11 at % niobium and 2-12 at % cobalt.

Abstract: An apparatus includes first and second fixation members, a flexible member coupled to the first and second fixation members, and a limiting element coupled to the flexible member. The limiting element is movable relative to the second fixation member and acts to limit loosening of the flexible member relative to the second fixation member. The limiting element can be slidably received by the flexible member. The flexible member can be coupled to the fixation members such that pulling on a free end of the flexible member shortens a length of the flexible member between the fixation members.

Abstract: A sewing needle is used in a sewing machine. The sewing needle has a working portion with a needle eye and a region which tapers into a needle tip. The needle eye passes through a needle body in a transverse direction perpendicularly to a longitudinal axis of the needle body. A twist groove is recessed in a front face of the needle body relative to the outer contour of the needle body, the twist groove extending in the direction of the needle tip from the needle eye. The twist groove is formed by a thread groove. The twist groove is preferably symmetrical relative to a first longitudinal central plane spanned by the longitudinal axis and the transverse direction. The thread groove has a groove portion adjacent to the needle eye and two end portions, each having a thread groove opening, remote from the needle eye.

Abstract: An apparatus and a method for surgical suturing with thread management. An apparatus for tissue suturing comprising a cartridge having a suturing needle having a pointed end and a blunt end, the suturing needle capable of rotating about an axis; a pusher assembly comprising a cartridge holder having a needle rotation drive capable of releasably engaging the cartridge and rotating the suturing needle about the axis; and an actuator capable of releasably engaging the needle rotation drive to rotate the needle rotation drive. A method for suturing tissue comprising placing a suturing device having a cartridge containing a suturing needle to span separated tissue segments; activating an actuator to cause rotational movement of the suturing needle through the separated tissue segments; and deactivating the actuator to stop an advancing movement of the suturing needle to cause a suturing material to be pulled through the separated tissue segments forming a stitch.

Abstract: The needle (12) of the device for inserting a wire into a tire has: a piercing zone (18) having an axis of symmetry, and a duct (30) having a proximal opening and a distal opening (36) opening into the zone (18) and off-center relative to the axis, the duct consisting of the proximal opening and of a rectilinear profiled section including the distal opening.

Abstract: A handicraft tool includes a first end, a second end and an intermediate portion. The first end and the second end are spaced apart from each other in the longitudinal direction of the handicraft tool. The intermediate portion is positioned between the first end and the second end. The intermediate portion is in the form of a bar having a cross section that is uniform along the longitudinal direction. At least the surface of the intermediate portion is made of a thermosetting elastomer.

Abstract: An apparatus for stitching a component is provided. The apparatus includes an awl bar assembly coupled to a first drive device. The awl bar assembly is moved from a first position to a second position along the stitch path with an external drive device. A second drive device is coupled to the first drive device. A needle bar assembly is provided having a needle. The needle moves between an inserted and a withdrawn position, the needle bar assembly being pivotally coupled to the second drive device, the needle bar assembly moves from the first position to the second position with the same external drive device driving the awl bar assembly. A biasing member is coupled to the needle bar assembly, the biasing member being arranged to pivot and align the needle bar assembly in the second position in response to the needle bar being moved to the withdrawn position.

Abstract: A sewing machine needle bar changing device includes a needle bar case having multiple needle bar holes, each of which receives a needle bar and has at least one longitudinal slide way formed on one side thereof; a needle bar case holder located at one side of the needle bar case and having a control guide way, which is engaged with the needle bars and has a longitudinal opening; a needle bar guide member engaged with one needle bar that is moved to a sewing position to align with the longitudinal opening, and brought by a crank link of the sewing machine to move upward and downward synchronously with the engaged needle bar; and a driving mechanism for moving and then holding a selected needle bar to the sewing position. All other needle bars not in the sewing position are restricted by the control guide way from moving axially.

Abstract: A punching device (1) is fastened at the pressure shaft of a sewing machine, vertically displaceable via a carrier (3). The vertical position of the press pad (35) at the body (33) can be adjusted by an adjustment screw (16) to the thickness of the textiles/work pieces to be processed.

Abstract: The needle (12) for inserting a wire into a tire has: a piercing zone (18) having an axis of symmetry, and a duct (30) having a proximal opening and a distal opening (36) opening into the zone (18) and off-centre relative to the axis, the duct consisting of the proximal opening and of a rectilinear profiled section including the distal opening.

Abstract: A needle having a shaft member and an eye member that is rotatable relative to the shaft member. The needle addresses the problem of a thread becoming twisted during use. The rotatable coupling between the shaft and eye member preferably has a surface profile that does not substantially alter the outer surface profile of the needle, thereby minimizing any affect on the normal use of the needle.

Abstract: A punching device (1) is fastened at the pressure shaft of a sewing machine, vertically displaceable via a carrier (3). The vertical position of the press pad (35) at the body (33) can be adjusted by an adjustment screw (16) to the thickness of the textiles/work pieces to be processed.

Abstract: An awl for use with a reciprocating device. The awl includes a mounting portion for operably engaging the reciprocating device. The awl also includes a shaft portion with an end for forming an awl feature on a sheet of material. Furthermore, the awl includes a mass portion for increasing the inertia of the awl when reciprocated by the reciprocating device toward the sheet of material.

Abstract: A device for producing thread-stitched book blocks from a stack of signatures are arranged flat one on top of the other and are stitched together by stitched seams formed at right angles to the folds by a binding thread passed repeatedly in double strands through the folds of the signatures. The device has a first stitching needle that inserts the binding thread and a second stitching needle that draws the binding thread through the fold from the inside. A punch needle, which passes through the fold from the inside edge to form a punched hole, is arranged opposite the first and second stitching needles, each of which forms a stitched seam. The section of the needle that is used to pierce a fold has a polygonal cross-sectional shape.

Abstract: A hand-held stitching tool for forming decorative patterns of yarn on mesh materials has a stitching needle with a blunt end and an elongated handle having a top surface and a bottom surface and sized for holding between the thumb and the index finger with the index finger resting along the top surface of the handle. Preferably, the handle is wide enough to allow the third finger to be supported by the handle, allowing the user to clamp the yarn with the third finger. The stitching needle has a distal end region with an eye passage bounded by flattened surfaces that are parallel to the top and bottom surfaces of the handle. A guide passage can be provided on the handle to carry the yarn along the handle. The tool is well suited for practicing the described methods for forming decorative loops and chain stitches on a mesh material.

Abstract: A bearded needle comprises a needle shank whose tip is shaped into a thin shank portion by tapering down the thickness of the needle shank. The thin shank portion has a conical projection portion at the extremity thereof. The conical projection portion has a hooking tip portion to form a hooking portion at the tip of the needle shank. The hooking portion has a substantially U-shaped bottom portion that hooks and holds a thread, and includes sloping surfaces each inclining toward an outer edge of the hooking tip portion. The sloping surfaces each extend from the bottom portion over both the conical projection portion and the hooking tip portion.

Abstract: A bearded needle comprises a needle shank whose tip is shaped into a thin shank portion by tapering down the thickness of the needle shank. The thin shank portion has a conical projection portion at the extremity thereof. The conical projection portion has a hooking tip portion to form a hooking portion at the tip of the needle shank. The hooking portion has a substantially U-shaped bottom portion that hooks and holds a thread, and includes sloping surfaces each inclining toward an outer edge of the hooking tip portion. The sloping surfaces each extend from the bottom portion over both the conical projection portion and the hooking tip portion.

Abstract: A novel tufting needle (4) is distinguished by a hollow flute (15) which is preferably symmetrical to a central plane (29) and which is bilaterally provided with chamfers (33, 34). The chamfers (33, 34) are, in an inward-located, that is, in a region lying close to the central plane (29), inclined at a small acute angle (?) to a reference plane (28), while in a region bordering an externally located rim (edges (46, 47)), the chamfers (33, 34) are inclined at a larger acute angle (?) to the reference plane (28). This feature improves the rigidity, the tufting properties and the mechanical strength, as well as the wear resistance of the novel tufting needle (4).

Abstract: A vertically reciprocatable needle (41) that is extremely fine in its lengthwise direction, having a leading end portion of a triangular pyramidal shape. Edges (41b) are formed on a periphery of the leading end portion, and an engaging portion (41c) is formed at a base thereof. The engaging portion comprises a recess (41d) and a tongue (41e) covering the recess. Below the engaging portion, a tapered guide surface (41f) continues straight from a point on a periphery of the needle to the recess. The recess is recessed in a needle axial direction. The tongue has a diameter smaller than the maximum diameter of the guide surface. The artificial hair may be hooked by the engaging portion during vertical movement of the needle, which assures relative movement of the needle at a pitch or width of high accuracy. Accordingly, the transplanting pitch of the artificial hair is controlled with high accuracy.

Abstract: A sewing machine needle free from combined troubles of stitch skipping and fabric yarn breakage, irrespective of high-speed and multifunction sewing machines and diversified materials being used. The sewing machine needle includes a shank, a blade connected to the shank, a needle point formed at an extremity of the blade, a needle eye formed in the vicinity of the needle point, and a long groove extending from the needle eye along the blade. The blade is provided at a portion thereof where the scarf is formed with a crank in such a manner that a side of the portion is outwardly protruded in a direction opposite from the scarf with respect to a central axis of the needle. An end of the needle eye contiguous to the scarf is protruded outward by a predetermined height from a contour of the blade.

Abstract: A sewing machine needle capable of preventing stitch skipping and fabric yarn breakage, irrespective of high-speed and multifunction sewing machines and diversified materials being used. Over a predetermined length from an edge, closer to a needle point, of a needle eye toward the needle point, a blade has a straight profile extending parallel to a longitudinal axis of the needle as viewed from a side of the needle in a direction orthogonal to a direction in which the needle eye extends. Over a predetermined length from the straight profile portion toward the needle point, the profile of the blade is a flat cross-section in which the thickness thereof in the direction in which the needle eye extends is larger than the width thereof in the direction orthogonal to the direction in which the needle eye extends. In a needle point portion following the flat cross-section portion and extending to the needle point, the blade has a sectional shape of a perfect circle.

Abstract: A tufting needle which has a transverse eye between the blade of the needle an the point and has a clearance above the eye in the blade on one side and has no yarn guide and protection groove on the opposite side. Also, disclosed is a conventional tufting needle which has the conventional yarn guide and protection groove.

Abstract: A sewing machine needle capable of preventing stitch skipping and fabric yarn breakage, irrespective of high-speed and multifunction sewing machines and diversified materials being used. Over a predetermined length from an edge, closer to a needle point, of a needle eye toward the needle point, a blade has a straight profile extending parallel to a longitudinal axis of the needle as viewed from a side of the needle in a direction orthogonal to a direction in which the needle eye extends. Over a predetermined length from the straight profile portion toward the needle point, the profile of the blade is a flat cross-section in which the thickness thereof in the direction in which the needle eye extends is larger than the width thereof in the direction orthogonal to the direction in which the needle eye extends. In a needle point portion following the flat cross-section portion and extending to the needle point, the blade has a sectional shape of a perfect circle.

Abstract: A needle module contains a plurality of needles having a shank and an eye at a first end and a mounting portion at the second end mounted in a module body. A rod is mounted on and spaced apart from the module body transversely to the needles. Yarn stands pass over the rod and are directed through the eyes of the needles.

Abstract: A needle module contains a plurality of needles having a shank and an eye at a first end and a mounting portion at the second end mounted in a module body. A rod is mounted on and spaced apart from the module body transversely to the needles. Yarn stands pass over the rod and are directed through the eyes of the needles.

Abstract: A new disposition is introduced into the shank of a sewing machine needle defining a shank (1), a shoulder (2), a blade (3), a clearance above eye (4), an eye (5) and a point (6). The shank (1) presents two transverse sections forming a T-shaped profile according to the sections BB and CC, and the T-shaped profile defines a unique height (G2) along an extent (S5) of the shank (1), and a unique width (S4) on a line (C1) extending along an area of a section (T1) of the extent (S5) that is equal to a width (S4) on a line (C2) of another section of the extent (S5).

Abstract: The present invention discloses a sewing needle structure for stitching a hidden nylon zipper, more particularly relates to a sewing needle structure applicable for the hidden nylon zippers of size No. 5 or above, characterized in that the sewing needle structure has at least three needles, which are parallel to each other. Those parallel needles are arranged with a gap having the smallest length within the maximum range and being evenly distributed along the interlocking teeth. The sewing needle structure having at least three needles fixes each seam between the interdigitating teeth, and the distance between the interlocking can be set to a minimum, such that the positioning of each tooth onto the tape by splicing could be more secure and reliable. Furthermore, the turnover folded edges of the two zipper tapes can be directly interlocked and securely coupled, and thereby the nylon zipper attains the hidden effect with high artistic quality.

Abstract: A new disposition is introduced into the shank of a sewing machine needle defining a shank (1), a shoulder (2), a blade (3), a clearance above eye (4), an eye (5) and a point (6). The shank (1) presents two transverse sections forming a T-shaped profile according to the sections BB and CC, and the T-shaped profile defines a unique height (G2) along an extent (S5) of the shank (1), and a unique width (S4) on a line (C1) extending along an area of a section (T1) of the extent (S5) that is equal to a width (S4) on a line (C2) of another section of the extent (S5).

Abstract: A needle, which may be one of a plurality of needles in a needle module, has a rod attached to the shank adjacent the yarn guide groove or to the blade in the guide groove and extending laterally or transverse to the axis of the needle committing yarn to be directed readily into the yarn groove with a minimum angular deviation in its path. When the needle is one of several in a needle module the rod may be common to all of the needles and passed through an aligned hole in each of the needles and secured therein by bending of the rod. A yarn entrance guide is formed by each respective needle, the adjacent needle, the rod and the module body and this entrance permits ready threading of each needle.

Abstract: A needle for introducing a thread into or through a fabric includes an elongated needle blade having a longitudinal axis; a needle point; and an eye traversing the needle blade at an acute angle to the longitudinal axis. The needle eye has an inlet and an outlet situated on opposite sides of the needle blade. The needle further has a protuberance formed on the needle blade. The protuberance adjoins the eye outlet and projects laterally away from the needle blade.

Abstract: A sewing machine needle includes a central longitudinal axis; a blade extending at least partially coaxially with the axis and terminating in a point; and an eye passing though the blade transversely to the axis and having an opening direction. The eye has opposite openings on opposite sides of the blade. Two mutually spaced walls forming part of the blade have respective inner faces bounding the eye. An indentation is provided in the blade in a region of at least one of the eye openings. The indentation reduces the height of at least one part of the eye walls as measured from the axis.

Abstract: A sewing machine needle includes a blade; a shank extending from one blade end and adapted to be clamped in a sewing machine; a needle point provided at the other blade end; an elevation provided on the blade adjacent the needle point; and an eye traversing the blade adjacent the needle point. The eye has a first eye end oriented toward the shank; a second eye end oriented toward the said point; a thread inlet side; and a thread outlet side. The elevation is situated on the thread outlet side between the needle point and the second eye end. The eye is bordered by two facing eye walls each having a respective edge at the thread outlet side. Each edge extends from the first eye end to the second eye end such that it is recessed from an imaginary straight line connecting the first eye end with the elevation.

Abstract: A sewing machine needle includes a substantially linear blade having a longitudinal axis and terminating in a needle point and an eye provided in the blade. The eye is bordered by two eye webs which are spaced from one another parallel to the axis and which are offset relative to one another transversely to the axis.

Abstract: A sewing machine needle includes a blade; a shank extending from one blade end and adapted to be clamped in a sewing machine; a needle point provided at the other blade end; an elevation provided on the blade adjacent the needle point; and an eye traversing the blade adjacent the needle point. The eye has a first eye end oriented toward the shank; a second eye end oriented toward the said point; a thread inlet side; and a thread outlet side. The elevation is situated on the thread outlet side between the needle point and the second eye end. The eye is bordered by two facing eye walls each having a respective edge at the thread outlet side. Each edge extends from the first eye end to the second eye end such that it is recessed from an imaginary straight line connecting the first eye end with the elevation.

Abstract: A method and apparatus for tufting comprises a hollow tufting needle supplied with a plurality of yarns. The plurality of yarns are maintained within the cavity of the needle. One of the yarns is selectively fed out of a yarn opening by releasing the yarn from a yarn feed device and utilizing an air injector proximate to the yarn entrance of the needle to assist in expelling the selected yarn from the needle. When a different yarn is desired to be utilized, the yarn feed device secures the previously selected yarn and another yarn is selectively fed in a similar manner as the first yarn. The needle utilized includes a plurality of holes or vents angled relative to the axis of the needle.

Abstract: An improved needle (1) to attach a filter bag (2) containing a product for infusion to a pick-up tag (3) using a thread (4) knotted at least at one of its end sections (5; 6) comprises two eyes (7, 8) located at different distances from the point (9) of the needle (1). The first eye (7) is designed to hook the thread (4), stretched and retained at the end sections (5, 6) and to make a loop (10) in the thread when the needle (1) is pulled in the direction of its axis (1a). The second eye (8), on the other hand, is located closer to the point (9) and is oriented at right angles to the first eye (7) so that it can be surrounded by the loop (10) and can guide an end section (5; 6) of the thread (4) across the loop (10) to make a knot. The needle (1) also comprises two lengthways grooves (11) that connect the first eye (7) to the second eye (8) and that are especially shaped to accommodate the loop (10) and to keep it in position while the knot is being formed.

Abstract: A tufting needle construction in which the mounting shank is offset from the axis of the blade and the yarn guide groove which extends to the eye and point portion of the needle. The yarn guide groove extends from a yarn entry mouth spaced from the shank so that yarn entering the groove from the mouth lies entirely within the groove and does not feed into the groove at an angle. Accordingly, when the needle pierces a backing material during the tufting process, the yarn is not crushed between the blade and the backing material. In one embodiment the shank is perpendicular to the blade. In another embodiment the shank has a first portion perpendicular to the blade and another portion parallel to the blade.

Abstract: A tufting needle is disclosed. The needle consists of a butt (3) and a shank (7). The butt can be integrally formed at least partially in a needle module (1), while the shank has a needle tip, provided with an eye (9), and a thread guide groove (8) on one side as well as a chamfer (10) at one edge of the side (11) which is located opposite the thread guide groove (8). A chamfer (10) is likewise provided at a second edge of the side (11) opposite the guide groove (8), and the tufting needle is symmetric relative to a plane centrally dividing the thread groove (8) and the side (11) opposite the guide groove (8).

Abstract: A tufting needle is disclosed. The needle has a shank (1) and a stem (2). The needle has a lower eye (4) in the stem (2) which is close to the tip (3) and an upper eye (6 in FIG. 1, and 15 in FIG. 2), and a thread-guiding groove (7) on one side running along the stem (2) and connecting the eyes (4 and 6 in FIGS. 1, and 4 and 15 in FIG. 2). The needle also has a transitional segment (5 in FIG. 1, and 14 in FIG. 2) between the lower end of the shank (1) and the upper end of the stem (2). The stem is offset with respect to the shank (1) but runs parallel thereto; the upper eye (6 in FIG. 1, and 15 in FIG. 2) is in the transitional segment (5 in FIG. 1 and 14 in FIG. 2) and is aligned with the thread-guiding groove (7).

Abstract: The connection filament inserting apparatus of the present invention is for inserting an anchor of a connection filament through an article, and comprises a hollow body having a front end, a rear end, and an inner space for accommodating the anchor, and a pointed conical portion formed at one end of the body. The hollow body has an opening formed at the rear end of the conical portion for releasing said anchor from the inner space of the body after the connecting filament inserting apparatus is passed through a structure.

Abstract: A cutting edge surgical suture needle. The suture needle is an elongated member having a proximal suture mounting end and a distal piercing tip. The distal section of the needle has a cross-section having a top side with opposed edges. The cross-section also has opposed curved concave lateral sides having top edges and bottom edges. The top edges of the concave sides and the opposed sides of the top side are coextensive and form cutting edges. The bottom edges of the opposed concave sides are coextensive and form a bottom cutting edge.

Abstract: A hollow needle for tag attachers, which comprises a blade (2) made by press working of a thin metal plate and a shank (3) of a synthetic resin integrally secured at a rear end part of the blade (2), wherein the blade (2) includes a front end part (2a) which has in a middle part thereof a semicircular shape in section and is formed in an outer surface portion thereof with a resistance reducing part (4) provided by partly depressing the outer periphery thereof, whereby the area of contact of a front end part of the hollow needle with an object partly through which the needle is applied in use is reduced and the needle has a desirable characteristic such that it can be applied straight in use.

Abstract: A needle includes a shank and a blade adjoining the shank. The blade has a conical length portion tapering in a direction away from the shank, a cylindrical length portion adjoining the conical length portion and a pointed tapering end portion adjoining the cylindrical length portion. The conical length portion is situated between the shank and the cylindrical length portion. An eye and a longitudinally extending groove are provided in the blade. Further, a circumferential, rounded constriction is provided in the blade adjacent the shank. The constriction which forms a predetermined breaking location, adjoins the conical length portion and is located between the shank and the conical length portion.