Cutting tool, cutting head, and tool shank.

Abstract

A cutting tool (20) includes a cutting head (22) and a tool shank (24), each having an axial abutment surface (66,76a). One of the two includes a coupling pin (38), while the other includes a pin receptacle (80) and a clamping through bore (96) that opens out to the pin receptacle. The coupling pin (38) has an engagement groove (52) and the pin receptacle has an engagement ridge(90). The coupling pin is received into the pin receptacle. The cutting head and tool shank are releasably attached together by a fastening member that passes through the clamping through bore and acts on the coupling pin so that the engagement groove abuts the engagement ridge and the axial abutment surfaces on each part abut each other.

Description

35 Cutting tool, cutting head, and tool shank. FIELD OF THE INVENTION

[001] The subject matter of the present application relates to cutting tools with two parts connected in a releasable manner, namely, a cutting head, with a cutting insert connected to it in a releasable manner, and a tool shank, in particular when one of the parts has a coupling pin, and more particularly when the two parts are releasably connected to each other by a clamping member acting on the coupling pin. FUNDAMENTALS OF THE INVENTION

[002] Cutting tools may be provided with a coupling mechanism for securely connecting a cutting head, with a cutting insert attached thereto in a releasable manner, to a tool shank. Typically, such a coupling mechanism includes a coupling pin that may be received in a pin receptacle. In addition, to securely connect the cutting head to the tool shank, the cutting tool may include a clamping member to act upon the coupling pin. An example of such a cutting tool is described, for example, in US 2020 / 198020, which describes a tool holder having a tool holder body in which a tool assembly is formed for securing a tool, and in which a tool holder interface is formed for securing the tool holder to a support shaft.The tool support interface includes a conical tool support section, which is polygonal in cross-section and can engage with a corresponding polygonal support shaft conical section to establish a defined relative position in the tangential direction between the tool assembly and the support shaft, and a cylindrical tool support section that can act together with a corresponding cylindrical support shaft section. Petition 870250073516, dated 08 / 20 / 2025, page 69 / 124 / 35

[003] In some of these cutting tools, the coupling pin is not cylindrical. An example of such a cutting tool is described, for example, in DE102019111843 B4, which describes an interchangeable head composed of an insertion rod, which can be inserted into an insertion opening of a tool holder. The insertion opening has a corner profile or an oval profile, and the insertion rod is designed to fit coupled to the insertion opening.

[004] It is an object of the subject matter of the present application to provide a new and improved coupling between a cutting head and a tool shank that is quick and easy to assemble, and that can also provide a secure connection of the cutting head to the tool shank. SUMMARY OF THE INVENTION

[005] According to a first aspect of the subject matter of the present application, a cutting tool is provided, with a central geometric tool axis that defines opposite forward and backward directions, the cutting tool including: a cutting head comprising: a peripheral surface of the head that extends circumferentially around the central geometric axis of the tool and forms a boundary of a first, rear-facing end surface of the head; an axial contact surface of the head located on the first end surface of the head; and an insert housing; a tool shaft comprising: a peripheral surface of the shank that extends circumferentially around the central geometric axis of the tool and forms a boundary of a first end surface of the shank facing forward; Petition 870250073516, dated 08 / 20 / 2025, page 70 / 124 / 35 an axial contact surface of the rod located on the first end surface of the rod; and a coupling pin projecting from one of the first end surfaces of the head and the first end surface of the rod, the coupling pin comprising: an outer peripheral surface of the pin that extends around a central geometric axis of the pin; a vertical geometric axis of the pin that is perpendicular to and intersects the central geometric axis of the pin, thus defining a vertical plane of the pin; a recessed pin engagement groove on the outer peripheral surface of the pin and extending from a free end of the pin towards a fixed end of the pin along a longitudinal geometric axis of the groove; and a recessed clamping recess on the outer peripheral surface of the pin opposite the pin engagement groove around the central geometric axis of the pin; a recessed pin receptacle situated between the first end surface of the head and the first end surface of the stem, the pin receptacle comprising: an inner peripheral surface of the receptacle that extends around a central geometric axis of the receptacle; a vertical geometric axis of the receptacle that is perpendicular to and intersects the central geometric axis of the receptacle, thus defining a vertical plane of the receptacle; and an engagement protrusion of the receptacle that projects from the inner peripheral surface of the receptacle and extends from an open end of the receptacle toward a bottom end of the receptacle along a longitudinal geometric axis of the protrusion; and Petition 870250073516, dated 08 / 20 / 2025, p. 71 / 124 / 35 a through clamping hole formed on either the peripheral surface of the head or the peripheral surface of the rod where the pin receptacle is recessed, and which opens to the pin receptacle in a through hole opening of the receptacle located opposite the engagement protrusion of the receptacle around the central geometric axis of the receptacle, wherein: The cutting tool is adjustable between a released position and a locked position, and in the locked position: The coupling pin is received in the pin receptacle; and a fastening member passes through the clamping hole and acts on the clamping recess of the coupling pin, so that: The engagement groove of the pin rests against the engagement protrusion of the receptacle; The axial contact surface of the head rests against the axial contact surface of the shank; and the cutting head and the tool shank are loosely connected to each other.

[006] According to a second aspect of the subject matter of the present application, a cutting head is provided, with a central geometric axis of the head defining opposite forward and backward directions, the cutting head comprising: a peripheral surface of the head that extends circumferentially around the central geometric axis of the head and forms a boundary of a first, rearward-facing head end surface; an axial contact surface of the head located on the first end surface of the head; an insert housing; and / or: Petition 870250073516, dated 08 / 20 / 2025, page 72 / 124 / 35 a coupling pin projecting from the first end surface of the head, the coupling pin comprising: an outer peripheral surface of the pin that extends around a central geometric axis of the pin; a vertical geometric axis of the pin that is perpendicular to and intersects the central geometric axis of the pin, thus defining a vertical plane of the pin; and a recessed pin engagement groove on the outer peripheral surface of the pin and extending from a free end of the pin towards a fixed end of the pin along a longitudinal geometric axis of the groove; and a recessed clamping recess on the outer peripheral surface of the pin opposite the pin engagement groove around the central geometric axis of the pin; or; a recessed pin receptacle on the first end surface of the head, the pin receptacle comprising: an inner peripheral surface of the receptacle that extends around a central geometric axis of the receptacle; A vertical geometric axis of the receptacle that is perpendicular to and intersects the central geometric axis of the receptacle, thus defining a vertical plane of the receptacle; and a receptacle engagement protrusion that projects from the inner peripheral surface of the receptacle and extends from an open end of the receptacle toward a bottom end of the receptacle along a longitudinal geometric axis of the protrusion; and a recessed clamping through hole in the peripheral surface of the head and opening into the pin receptacle in a receptacle through-hole opening located opposite the receptacle engagement protrusion. Petition 870250073516, dated 08 / 20 / 2025, page 73 / 124 / 35 around the central geometric axis of the receptacle.

[007] According to a third aspect of the subject matter of the present application, a tool rod is provided, with a central geometric axis of the rod defining opposite forward and backward directions, the tool rod comprising: a peripheral surface of the rod that extends circumferentially around the central geometric axis of the rod and that forms a boundary of a first end surface of the rod facing forward; an axial contact surface of the rod located on the first end surface of the rod; and / or: a coupling pin projecting from the first end surface of the rod, the coupling pin comprising: an outer peripheral surface of the pin that extends around a central geometric axis of the pin; a vertical geometric axis of the pin that is perpendicular to and intersects the central geometric axis of the pin, thus defining a vertical plane of the pin; and a recessed pin engagement groove on the outer peripheral surface of the pin and extending from a free end of the pin towards a fixed end of the pin along a longitudinal geometric axis of the groove; and a recessed clamping recess on the outer peripheral surface of the pin opposite the pin engagement groove around the central geometric axis of the pin; or; a recessed pin receptacle on the first end surface of the rod, the pin receptacle comprising: Petition 870250073516, dated 08 / 20 / 2025, p. 74 / 124 / 35 an inner peripheral surface of the receptacle that extends around a central geometric axis of the receptacle; a vertical geometric axis of the receptacle that is perpendicular to and intersects the central geometric axis of the receptacle, thus defining a vertical plane of the receptacle; and a receptacle engagement protrusion that projects from the inner peripheral surface of the receptacle and extends from an open end of the receptacle toward a bottom end of the receptacle along a longitudinal geometric axis of the protrusion; and a through hole recessed into the peripheral surface of the rod and opening into the pin receptacle in a through hole opening of the receptacle located opposite the receptacle engagement protrusion around the central geometric axis of the receptacle.

[008] It is understood that the above is a summary, and that features described below may be applicable in any combination to the subject matter of the present application, for example, any of the following features may be applicable to the cutting head, the tool shank or the cutting tool:

[009] The coupling pin may project from the first end surface of the head. The pin receptacle may be recessed into the first end surface of the rod. The clamping through hole may be formed in the peripheral surface of the rod.

[0010] The engagement groove of the pin may comprise a concave curved portion of the groove extending along the longitudinal geometric axis of the groove. The engagement protrusion of the receptacle may comprise a convex curved portion of the protrusion extending along the longitudinal geometric axis of the protrusion. In the locked position, the concave curved portion of the groove may abut the convex curved portion of the protrusion. Petition 870250073516, dated 08 / 20 / 2025, page 75 / 124 / 35

[0011] The cutting tool may comprise a single centrally arranged coupling pin and a single centrally arranged pin receptacle.

[0012] The cutting tool may comprise exactly one clamping member and exactly one through hole for securing the cutting head to the tool shank. The coupling pin may comprise exactly one clamping recess.

[0013] The through hole for clamping may comprise an internally threaded portion. The fastening member may comprise an externally threaded portion. In the locked position, the externally threaded portion may be threaded into the internally threaded portion.

[0014] The cutting tool may comprise a supplementary clamping screw. The cutting head may comprise a through-hole for clamping the head recessed into the second end surface of the head and opening onto the first end surface of the head. The tool shank may comprise a threaded hole for clamping the shank recessed into the first end surface of the shank. In the locked position, the supplementary clamping screw may be located in the through-hole for clamping the head and threaded into the threaded hole for clamping the shank.

[0015] The cutting head and the tool shank may have the same hardness.

[0016] The coupling pin may project from the first end surface of the rod. The pin receptacle may be recessed into the first end surface of the head. The clamping through hole may be formed in the peripheral surface of the head.

[0017] The coupling pin may project from the first end surface of the head.

[0018] The vertical plane of the pin may intersect the engagement groove. Petition 870250073516, dated 08 / 20 / 2025, page 76 / 124 / 35 of the pin. The engagement groove of the pin may present mirror asymmetry in relation to the vertical plane of the pin.

[0019] The pin engagement groove may comprise two opposing side groove surfaces that slope inward in directions opposite to the width of the pin engagement groove, so that they converge toward each other.

[0020] The two lateral groove surfaces may intersect.

[0021] The pin engagement groove may comprise a curved concave groove portion extending along the longitudinal geometric axis of the groove and connecting the two lateral groove surfaces.

[0022] The curved concave portion of a groove can be defined by a concave groove radius. The concave groove radius can be greater than or equal to 2.8 mm and less than or equal to 3.6 mm.

[0023] The pin engagement groove may have a groove depth. The groove depth may be greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0024] The groove depth can be constant along the longitudinal geometric axis of the groove.

[0025] The pin engagement groove may have a groove width. The groove width may be greater than or equal to 5.0 mm and less than or equal to 5.84 mm.

[0026] The groove width can be constant along the longitudinal geometric axis of the groove.

[0027] The engagement groove of the pin may extend lengthwise along the entire axial length of the coupling pin.

[0028] The longitudinal geometric axis of the groove can be parallel to the central geometric axis of the pin.

[0029] The cutting head may additionally comprise a cooling head channel with a cooling head channel inlet. Petition 870250073516, dated 08 / 20 / 2025, page 77 / 124 / 35 and a cooling channel outlet for the head. The coupling pin may comprise a rear surface of the pin bounded by the outer peripheral surface of the pin. The cooling channel inlet of the head may be located on the rear surface of the pin.

[0030] The engagement groove of the pin may extend to the rear surface of the pin.

[0031] The cutting head may further comprise a second head end surface opposite the first head end surface. The cutting head may further comprise a through head clamping hole recessed in the second head end surface and opening onto the first head end surface.

[0032] The outer peripheral surface of the pin may comprise opposite upper and lower pin surfaces and two opposite lateral pin surfaces connecting the upper and lower pin surfaces. The clamping recess may be located on the upper surface of the pin. The clamping recess may comprise a clamping recess contact surface that inclines toward a median plane of the pin containing the central geometric axis of the pin and extends across the two opposite lateral pin surfaces in a direction facing the first end surface of the head.

[0033] The contact surface of the clamping recess may form an angle of inclination of the recess with the upper surface of the pin. The angle of inclination of the recess may be greater than or equal to 6° and less than or equal to 10°.

[0034] The insert housing may comprise a housing seating surface configured to seat a cutting insert, the housing seating surface facing the same direction as the top surface of the pin.

[0035] The pin receptacle can be recessed in the first Petition 870250073516, dated 08 / 20 / 2025, p. 78 / 124 / 35 end surface of the rod. The through clamping hole may be formed on the peripheral surface of the rod.

[0036] The vertical plane of the receptacle may intersect the receptacle's engagement protrusion. The receptacle's engagement protrusion may exhibit mirror asymmetry with respect to the receptacle's vertical plane.

[0037] The receptacle engagement protrusion may comprise two opposing lateral protrusion surfaces that slope inward in directions opposite to the width of the receptacle engagement protrusion, so that they converge toward each other.

[0038] The two lateral surfaces of the projection may intersect.

[0039] The receptacle engagement protrusion may comprise a convex curved portion of the protrusion that extends along the longitudinal geometric axis of the protrusion and connects the two lateral surfaces of the protrusion.

[0040] The convex curved portion of the protrusion can be defined by a convex radius of the protrusion. The convex radius of the protrusion can be greater than or equal to 2.8 mm and less than or equal to 3.6 mm.

[0041] The engagement protrusion of the receptacle may have a protrusion height. The protrusion height may be greater than or equal to 0.3 mm and less than or equal to 0.7 mm.

[0042] The height of the projection can be constant along the longitudinal geometric axis of the projection.

[0043] The receptacle engagement protrusion may have a protrusion width. The protrusion width may be greater than or equal to 5.0 mm and less than or equal to 5.84 mm.

[0044] The width of the overhang can be constant along the longitudinal geometric axis of the overhang.

[0045] The engagement protrusion of the receptacle may extend lengthwise along the entire axial extent of the receptacle. Petition 870250073516, dated 08 / 20 / 2025, p. 79 / 124 / 35 pino.

[0046] The longitudinal geometric axis of the protrusion may be parallel to the central geometric axis of the receptacle.

[0047] The tool rod may comprise a rod cooling channel with a rod cooling channel inlet and a rod cooling channel outlet. The pin receptacle may comprise a rear receptacle surface bounded by the inner peripheral surface of the receptacle. The rod cooling channel outlet may be located on the rear surface of the receptacle.

[0048] The tool shank may comprise a threaded hole for clamping the shank countersunk in the first end surface of the shank.

[0049] The clamping through hole may tilt away from the first end surface of the rod in a direction from the peripheral surface of the rod to the through hole opening of the receptacle.

[0050] The clamping through hole may be inclined at a hole inclination angle relative to the vertical axis of the receptacle. The hole inclination angle may be greater than or equal to 6° and less than or equal to 10°.

[0051] The engagement protrusion of the receptacle may extend to the first end surface of the rod.

[0052] The through hole for clamping may comprise an internal threaded portion. BRIEF DESCRIPTION OF THE FIGURES

[0053] For a better understanding of the present application and to show how it can be carried out in practice, reference is now made to the attached drawings, in which: Figure 1 is a perspective view of a cutting tool according to a first embodiment of the present application; Figure 2 is an exploded perspective view of the cutting tool shown in Figure 1; Petition 870250073516, dated 08 / 20 / 2025, page 80 / 124 / 35 Figure 3 is a perspective view of a cutting head shown in Figures 1 and 2; Figure 4A is a rear view of the cutting head shown in Figure 3, showing a concealed clamping recess; Figure 4B is a detail of Figure 4A; Figure 5 is a front view of the cutting head shown in Figure 3; Figure 6 is a top view of the cutting head shown in Figure 3; Figure 7 is a bottom view of the cutting head shown in Figure 3; Figure 8 is a side view of the cutting head shown in Figure 3, showing the concealed clamping recess, the head clamping through hole, and the head cooling channel; Figure 9 is a perspective view of a front end of a tool rod shown in Figures 1 and 2; Figure 10 is another perspective view of the front end of a tool rod shown in Figure 9; Figure 11 is a top view of the front end of the tool shank shown in Figure 9; Figure 12A is a front view of the tool shank from Figure 9; Figure 12B is a detail of Figure 12A; Figure 13 is a side view of the front end of the tool shank shown in Figure 9, showing a concealed through clamping hole, a threaded shank clamping hole, and a shank cooling channel; Figure 14 is a top view of the front end of the cutting tool shown in Figure 9; Petition 870250073516, dated 08 / 20 / 2025, page 81 / 124 / 35 Figure 15A is a cross-sectional view of the cutting tool taken along line XV-XV in Figure 14; Figure 15B is a detail of Figure 15A; Figure 16 is a cross-sectional view of the cutting tool taken along line XVI-XVI in Figure 14; and Figure 17 is an exploded view of the rotary cutting tool according to a second embodiment of the present application.

[0054] It will be understood that, for simplicity and clarity of illustration, the elements shown in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated in relation to other elements for the sake of clarity, or several physical components may be included in a single block or functional element. Furthermore, when deemed appropriate, reference numbers may be repeated between figures to indicate corresponding or analogous elements. DETAILED DESCRIPTION OF THE INVENTION

[0055] In the following description, various aspects of the subject matter of this application will be described. For explanatory purposes, specific configurations and details are set forth in sufficient detail to provide a complete understanding of the subject matter of this application. However, it will also be evident to a person skilled in the art that the subject matter of this application can be practiced without the specific configurations and details set forth in this document.

[0056] Attention is first directed to Figures 1 and 2, which show a cutting tool 20, 120 of the type used for turning operations, according to embodiments of the subject matter of the present application. In this non-limiting example shown in the drawings, the cutting tool 20, 120 is a grooving tool for cutting internal grooves. The cutting tool 20, 120 has a central geometric tool axis A Petition 870250073516, dated 08 / 20 / 2025, p. 82 / 124 / 35 which defines opposite directions forward and backward Df, Dr.

[0057] It should be understood that the use of the terms “forward” and “backward” throughout the description and claims refers to a relative position in the direction of the central geometric axis of tool A facing, respectively, to the right and to the left, in Figure 8.

[0058] The cutting tool 20, 120 comprises two parts, namely, a cutting head 22, 122 and a supplementary tool shank 24, 124 that is releasably attachable to it. Both parts can normally be made of the same material, for example, steel. Thus, both parts can have the same hardness. A cutting insert 26 is releasably attached to the cutting head 22, 122 in an insert housing 27. The cutting tool 20, 120 is therefore modular. In this non-limiting example shown in the drawings, the cutting tool 20, 120 includes a single cutting insert 26. However, the cutting tool 20, 120 may have a plurality of cutting inserts. Each cutting insert 26 can normally be made of carbide and is attached to the insert housing 27, which may be located at a forward end of the cutting head 22, 122. The cutting tool 20, 120 is adjustable between a released position and a locked position.In the locked position of the cutting tool 20, 120, the cutting head 22, 122 is loosely connected to the tool shank 24, 124 by a clamping member 28.

[0059] With particular reference to Figure 3, the insert housing 27 includes a housing seating surface 27a configured to seat the cutting insert 26. In the non-limiting example shown in Figures 1 to 4, the insert housing 27 is in the form of a groove with a flexible upper arm for clamping the cutting insert. However, as shown in Figure 17, which shows a turning tool, the insert housing 27 may be a typical turning housing, in which the cutting insert 26 is clamped by a clamping screw (not Petition 870250073516, dated 08 / 20 / 2025, page 83 / 124 / 35 shown).

[0060] With reference to Figures 3 to 8, the cutting head 22, 122 includes the first and second end surfaces of the opposing head 34a, 34b and a peripheral head surface 36 extending between them. The first end surface of the head 34a is facing backwards in the Df direction and therefore backwards. The peripheral head surface 36 extends circumferentially around the central geometric axis of the tool A and forms a boundary of the first and second end surfaces of the head 34a, 34b. The central geometric axis of the tool A intersects the first and second end surfaces of the head 34a, 34b. The cutting head 22, 122 has its own central geometric axis of the head B, which is coincident (i.e., aligned) with the central geometric axis of the tool A when the cutting tool 20, 120 is in the locked position.

[0061] According to some embodiments of the subject matter of the present application, the cutting head 22, 122 can be additively manufactured. The cutting head 22, 122 can be integrally formed to have a one-piece unitary construction. It should be noted that the use of the term “additively manufactured” throughout the description and claims refers to processes used to create a three-dimensional object in which layers of material are formed to create an object. Examples of such processes include, but are not limited to, selective laser melting (SLM), selective laser sintering (SLS), direct metal laser sintering (DMLS), fused deposition modeling (FDM), and 3D printing.

[0062] With reference to Figures 9 to 13, tool shank 24, 124 includes the first and second end surfaces of the opposite shank 76a, 76b and a peripheral surface of the shank 78 extending between them. The first end surface of the shank 76a faces towards the Petition 870250073516, dated 08 / 20 / 2025, page 84 / 124 / 35 front Df and therefore facing forward. The peripheral surface of shank 78 extends circumferentially around the central geometric axis of tool A and forms a boundary of the first and second end surfaces of shank 76a, 76b. The central geometric axis of tool A intersects the first and second end surfaces of shank 76a, 76b. Tool shank 24, 124 has its own central geometric axis of shank C, which is coincident (i.e., aligned) with the central geometric axis of tool A when cutting tool 20, 120 is in the locked position.

[0063] As best seen in Figure 3, the cutting tool 20, 120 includes a coupling pin 38 that extends along a central geometric axis of the pin D. The coupling pin 38 projects from one of the first end surfaces of the head 34a and the first end surfaces of the shank 76a. According to the first embodiment of the matter of the present application (i.e., Figure 2), the coupling pin 38 may project from the first end surface of the head 34a. Alternatively, according to the second embodiment of the matter of the present application (i.e., Figure 17), the coupling pin 38 may project from the first end surface of the shank 76a.The coupling pin 38 has a fixed end of the pin 40 (from which the coupling pin 38 is fixed to either of the first end surfaces of the head 34a and the first end surfaces of the rod 76a from which the coupling pin 38 projects) and a free end of the pin 41 axially opposite to the fixed end of the pin 40.

[0064] The purpose of the coupling pin 38 is twofold. Firstly, to position the cutting head 22, 122 in a precise and predetermined position relative to the tool shank 24, 124. Secondly, to provide a means of coupling between the cutting head 22, 122 and the Petition 870250073516, dated 08 / 20 / 2025, page 85 / 124 / 35 tool rod 24, 124. The coupling pin 38 includes an outer peripheral surface of the pin 44 that extends around the central geometric axis of the pin D.

[0065] As seen in Figures 3 and 4, coupling pin 38 has a non-cylindrical cross-sectional shape along most of its length on the central geometric axis of pin D. Thus, the outer peripheral surface of pin 44 does not have a helical thread extending in the direction along the central geometric axis of pin D and, therefore, can be considered an unthreaded outer peripheral surface of pin 44.

[0066] According to some embodiments of the subject matter of the present application, the outer peripheral surface of pin 44 may not be conical. That is, the outer peripheral surface of pin 44 may not incline toward (or away from) the central geometric axis of pin D in the backward direction Dr. The coupling pin 38 may include a rear surface of pin 42 that is offset from the first end surface of the head 34a by the outer peripheral surface of pin 44. In other words, the outer peripheral surface of pin 44 may extend between the rear surface of pin 42 and the first end surface of the head 34a. The rear surface of pin 42 may be bounded by the outer peripheral surface of pin 44. The central geometric axis of pin D may intersect the rear surface of pin 42.The cutting tool 20, 120 may include a single coupling pin 38 that may be centrally arranged (i.e., coupling pin 38 may extend along the central geometric axis of head B). The central geometric axis of pin D may coincide with the central geometric axis of head B.

[0067] With reference to Figure 4A, according to some embodiments of the subject matter of the present application, the outer peripheral surface of pin 44 includes the upper and lower surfaces of pins 46, 48 opposite and two Petition 870250073516, dated 20 / 08 / 2025, p. 86 / 124 / 35 opposite lateral surfaces of pin 50 connecting the upper and lower surfaces of pin 46, 48. According to some embodiments of the subject matter of the present application, the upper surface of pin 46 may be flat. The two lateral surfaces of pin 50 may be convexly curved.

[0068] Coupling pin 38 includes a vertical geometric axis of pin VP, which is perpendicular to and intersects the central geometric axis of pin D, and also intersects the upper and lower surfaces of pins 46, 48. The vertical geometric axis of pin VP defines opposite upward and downward directions Du, Dd. Coupling pin 38 includes a horizontal geometric axis of pin HP that intersects the central geometric axis of pin D and also the two lateral surfaces of pin 50. The central geometric axis of pin D, the vertical geometric axis of pin VP, and the horizontal geometric axis of pin HP are mutually perpendicular to each other. Coupling pin 38 has a median plane of pin MP that contains the central geometric axis of pin D and the horizontal geometric axis of pin HP, and extends through (i.e., intersects) the two lateral surfaces of pin 50.The coupling pin 38 has a vertical plane of the PVP pin that contains the central geometric axis of pin D and the vertical geometric axis of pin VP and is therefore defined by their intersection, and extends through (i.e., intersects) the upper and lower surfaces of pins 46, 48.

[0069] It should be understood that the use of the terms “up” and “down” throughout the description and claims refers to a relative position in the direction of the vertical geometric axis of the VP pin, up and down, respectively, in Figure 4A.

[0070] With reference to Figures 3 and 4, coupling pin 38 includes a recessed pin 52 engagement groove on the outer peripheral surface of pin 44. Specifically, the pin 52 engagement groove is located on the lower surface of pin 48. The pin 52 engagement groove extends from the free end of pin 41 towards the fixed end of Petition 870250073516, dated 20 / 08 / 2025, p. 87 / 124 / 35 pin 40. The engagement groove of pin 52 extends along a longitudinal geometric axis of groove G. The engagement groove of pin 52 is formed between two pin 53 protrusions. According to some embodiments of the subject matter of the present application, the longitudinal geometric axis of groove G may be parallel to the central geometric axis of pin D. In some embodiments, the vertical plane of pin PVP may contain both the longitudinal geometric axis of groove G and the central geometric axis of pin D.

[0071] The engagement groove of pin 52 may extend linearly along the longitudinal geometric axis of groove G. The engagement groove of pin 52 may have a U-shaped cross-section in a plane perpendicular to the longitudinal geometric axis of groove G and / or to the central geometric axis of pin D. The engagement groove of pin 52 may extend to (i.e., intersect) the rear surface of pin 42.

[0072] With reference to Figure 4B, the two pin protrusions 53 may have different heights (i.e., extend downwards DD to different positions). Alternatively, in some embodiments, the two pin protrusions 53 may have distinct shapes and / or circumferential lengths. The engagement groove of pin 52, and therefore the coupling pin 38 itself, may exhibit mirror asymmetry with respect to the vertical plane of pin PVP. The longitudinal geometric axis of groove G may be displaced (i.e., not contained) and parallel to the vertical plane of pin PVP.

[0073] Referring to Figure 4B, according to some embodiments of the subject matter of the present application, the engagement groove of pin 52 may include two opposing lateral groove surfaces 54 that incline inwards (i.e., towards the central geometric axis of pin D) in directions opposite to the width of the engagement groove of pin 52, so that they converge towards each other. The two lateral groove surfaces 54 may intersect. The longitudinal geometric axis of the groove G may be defined Petition 870250073516, dated 08 / 20 / 2025, p. 88 / 124 / 35, regarding the intersection of the two lateral surfaces of groove 54.

[0074] According to some embodiments of the subject matter of the present application, the engagement groove of pin 52 may include a concave curved portion of groove 56. The concave curved portion of groove 56 may connect the two lateral surfaces of groove 54. The concave curved portion of groove 56 may extend along the longitudinal geometric axis of groove G. The concave curved portion of groove 56 contains the lowest point of the engagement groove of pin 52.

[0075] According to some embodiments of the subject matter of the present application, the coupling pin 38 may have a basic kidney-shaped profile in a front view of the cutting head 22, 122 (i.e., Figure 4A). It is noted that the coupling pin 38 may exhibit only 360° rotational symmetry about the central geometric axis of the pin D. Thus, the coupling pin 38 is considered “rotational asymmetric” about the central geometric axis of the pin D.

[0076] Referring again to Figure 4B, the curved concave portion of groove 56 can be defined by a concave groove radius GR. The concave groove radius GR can satisfy the condition: 2.8 mm < GR < 3.6 mm. Preferably, the concave groove radius GR can be equal to 3.2 mm.

[0077] The curved concave portion of groove 56 has a concave portion width GCW. The concave portion width GCW is measured along the horizontal geometric axis of groove HG. According to some embodiments of the subject matter of the present application, the concave portion width GCW may satisfy the condition: 2.84 mm < GCW < 3.24 mm. Preferably, the concave portion width GCW may be equal to 3.04 mm. The concave portion width GCW may be constant along the longitudinal geometric axis of groove G.

[0078] The engagement groove of pin 52 has a depth of Petition 870250073516, dated 20 / 08 / 2025, p. 89 / 124 / 35 GD slot. The depth of the GD slot is measured along the vertical geometric axis of the VP pin (between the closest and furthest points of the pin engagement slot relative to the median plane of the MP pin). According to some embodiments of the subject matter of the present application, the depth of the GD slot may satisfy the condition: 0.3 mm < GD < 0.7 mm. Preferably, the depth of the GD slot may satisfy the condition: 0.4 mm < GD < 0.6 mm. More preferably, the depth of the GD slot may be equal to 0.5 mm. The depth of the GD slot may be constant along the longitudinal geometric axis of the G slot.

[0079] The engagement groove of pin 52 has a groove width GW. The groove width GW is measured along the horizontal geometric axis of pin HP (between the furthest points of the pin engagement groove on each side of the vertical plane of pin PVP). According to some embodiments of the subject matter of the present application, the groove width GW may satisfy the condition: 5.0 mm < GW < 5.84 mm. Preferably, the groove width GW may be equal to 5.42 mm. The groove width GW may be constant along the longitudinal geometric axis of groove G. The groove width GW may be greater than the concave portion width GCW.

[0080] With reference to Figure 7, the engagement groove of pin 52 has a groove length GL. The groove length GL is measured along the central geometric axis of pin D. According to some embodiments of the subject matter of the present application, the engagement groove of pin 52 may extend lengthwise along the entire axial length of the coupling pin 38.

[0081] As seen in Figure 6, the outer peripheral surface of pin 44 includes a clamping recess 58. In other words, the clamping recess 58 is located peripherally on the coupling pin 38. Specifically, the clamping recess 58 is located on the upper surface. Petition 870250073516, dated 20 / 08 / 2025, p. 90 / 124 / 35 of pin 46. The clamping recess 58 is designed to receive a portion of the fastening member 28. As seen in Figures 3 and 4, the clamping recess 58 is located opposite the engagement groove of pin 52 around the central geometric axis of pin D. Thus, according to some embodiments of the subject matter of the present application, the vertical plane of pin PVP may intersect the clamping recess 58 and the engagement clamping groove of pin 52. The upper surface of pin 46 (on which the clamping recess 58 is located) may face in the same direction as the seating surface of the housing 27a.

[0082] With reference to Figure 8, according to some embodiments of the subject matter of the present application, the coupling pin 38 may include exactly a clamping recess 58. The clamping recess 58 may be offset from the rear surface of the pin 42. Similarly, the clamping recess 58 may be offset from the first end surface of the head 34a. The clamping recess 58 may include a clamping recess contact surface 60 for contact with the fastening member 28. The clamping recess contact surface 60 may be flat. The clamping recess contact surface 60 may be inclined towards the median plane of the pin MP in a direction facing the first end surface of the head 34a. The contact surface of the clamping recess 60 can form a recess inclination angle θ with the upper surface of the pin 46. The recess inclination angle θ can be greater than or equal to 6° and less than or equal to 10°.Preferably, the recess angle θ can be equal to 8°. Thus, the clamping recess 58 can be shallow and not unduly reduce the overall strength of the coupling pin 38.

[0083] As seen in Figures 6 and 7, the cutting head 22, 122 includes an axial head contact surface 66 located on the first head end surface 34a. The axial head contact surface 66 serves to abut a corresponding surface on the tool shank 24, 124. According to some embodiments of the material of Petition 870250073516, dated 08 / 20 / 2025, page 91 / 124 / 35 present request, the axial contact surface of head 66 may extend radially outward to the peripheral surface of head 36. The axial contact surface of head 66 may be flat and extend perpendicularly to the central geometric axis of head B.

[0084] According to some embodiments of the subject matter of the present application, the cutting head 22, 122 may include a head clamping through hole 62 recessed into the second end surface of the head 34b and opening onto the first end surface of the head 34a. The head clamping through hole 62 is designed to receive a clamping screw for supplementary tightening, as described later in the description. As best seen in Figure 4A, the engagement groove of the pin 52 allows the diameter of the head clamping through hole 62 to be larger than would be permitted if there were no groove and the coupling pin extended further downward (i.e., in a direction away from the median plane of the pin MP).

[0085] With reference to Figure 8, according to some embodiments of the subject matter of the present application, the cutting head 22, 122 may include a head cooling channel 70. The head cooling channel 70 has a head cooling channel inlet 72i and a head cooling channel outlet 72o. The head cooling channel outlet 72o is in fluid communication with the head cooling channel inlet 72i by means of the head cooling channel 70. The head cooling channel outlet 72o is located so as to direct the cooling fluid to a cutting region. The head cooling channel inlet 72i may be located on the rear surface of pin 42. In this non-limiting example shown in the drawings, the cutting head 22, 122 includes two head cooling channels 70.

[0086] As best seen in Figures 9 to 13, the cutting tool 20, 120 includes a pin receptacle 80 that extends along a Petition 870250073516, dated 20 / 08 / 2025, page 92 / 124 / 35 central geometric axis of receptacle E. The pin receptacle 80 is recessed on the other of the first end surface of the head 34a and the first end surface of the rod 76a (i.e., recessed on the first end surface of the head 34a or on the first end surface of the rod 76a from which the coupling pin 38 does not project). According to the first embodiment of the subject matter of the present application, the pin receptacle 80 may be recessed on the first end surface of the rod 76a. As seen in the figures, in the first embodiment, the pin receptacle 80 may be recessed on a rod projection 39 that projects forward Df from an axial contact surface of the rod 104 located on the first end surface of the rod 76a.Alternatively, according to the second embodiment of the subject matter of the present application, the pin receptacle 80 may be recessed on the first end surface of the head 34a.

[0087] Referring to Figure 13, the pin receptacle 80 includes an open end of the receptacle 82 (which opens to either the first end surface of the head 34a and the first end surface of the stem 76a where the pin receptacle 80 is recessed) and a bottom end of the receptacle 84 axially opposite to the open end of the receptacle 82. The pin receptacle 80 includes an inner peripheral surface of the receptacle 86 that extends around the central geometric axis of the receptacle E. In the embodiment shown, the inner peripheral surface 86 does not have an internal helical thread extending in a direction along the central geometric axis of the receptacle E and, therefore, can be considered an unthreaded inner peripheral surface 86.According to some embodiments of the subject matter of the present application, the pin receptacle 80 may include a rear surface of the receptacle 88 bounded by the inner peripheral surface of the receptacle 86. The central geometric axis of the receptacle E may intersect the surface. Petition 870250073516, dated 20 / 08 / 2025, p. 93 / 124 / 35 rear of receptacle 88. Cutting tool 20, 120 may include a single pin receptacle 80 which may be centrally disposed (i.e., pin receptacle 80 may extend along the central geometric axis of rod C). The central geometric axis of receptacle E may be coincident with the central geometric axis of rod C.

[0088] With reference to Figure 12A, the inner peripheral surface of receptacle 86 includes opposite upper and lower surfaces of receptacle 116, 118 and two opposite lateral surfaces of receptacle 119 connecting the upper and lower surfaces of receptacle 116, 118. According to some embodiments of the matter of the present application, the upper surface of receptacle 116 may be flat. The two lateral surfaces of receptacle 119 may be concave curved.

[0089] Pin receptacle 80 includes a vertical geometric axis of receptacle VR, which is perpendicular to and intersects the central geometric axis of receptacle E, and also intersects the upper and lower surfaces of receptacle 116, 118. Pin receptacle 80 includes a horizontal geometric axis of receptacle HR, which intersects the central geometric axis of receptacle E and also the two lateral surfaces of receptacle 119. The central geometric axis of receptacle E, the vertical geometric axis of receptacle VR, and the horizontal geometric axis of receptacle HR are mutually perpendicular to each other. Pin receptacle 80 has a median plane of receptacle MR, which contains the central geometric axis of receptacle E and the horizontal geometric axis of receptacle HR, and extends through (i.e., intersects) the two lateral surfaces of receptacle 119.The pin receptacle 80 has a vertical plane of the RVP receptacle, which contains the central geometric axis of the E receptacle and the vertical geometric axis of the VR receptacle and is therefore defined by their intersection. The vertical plane of the RVP receptacle extends through (i.e., intersects) the upper and lower surfaces of the 116, 118 receptacle. Petition 870250073516, dated 08 / 20 / 2025, p. 94 / 124 / 35

[0090] The pin receptacle 80 includes a receptacle engagement protrusion 90 projecting from the inner peripheral surface of the receptacle 86. Specifically, the receptacle engagement protrusion 90 is located on the lower surface of the receptacle 118. The receptacle engagement protrusion 90 extends from the open end of the receptacle 82 toward the bottom end of the receptacle 84 along a longitudinal geometric axis of protrusion R. The receptacle engagement protrusion 90 is formed between two grooves of the receptacle 91. According to some embodiments of the subject matter of the present application, the longitudinal geometric axis of protrusion R may be parallel to the central geometric axis of the receptacle E. In some embodiments, the vertical plane of the receptacle RVP may contain both the longitudinal geometric axis of protrusion R and the central geometric axis of the receptacle E, as well as the vertical geometric axis of the receptacle VR.

[0091] The engagement protrusion of receptacle 90 may extend linearly along the longitudinal geometric axis of protrusion R. The engagement protrusion of receptacle 90 may have a U-shaped cross-section in a plane perpendicular to the longitudinal geometric axis of protrusion R and / or to the central geometric axis of receptacle E. The engagement protrusion of receptacle 90 may extend to (i.e., intercept) the first end surface of rod 76a.

[0092] With reference to Figure 12B, the two grooves of receptacle 91 may have different depths (i.e., extend downwards Dd to different positions). Alternatively, in some embodiments, the two grooves of receptacle 91 may have distinct shapes and / or circumferential lengths. The engagement protrusion of receptacle 90, and therefore the pin receptacle itself 80, may exhibit mirror asymmetry with respect to the vertical plane of receptacle RVP. The longitudinal geometric axis of protrusion R may be displaced (i.e., not contained) and Petition 870250073516, dated 08 / 20 / 2025, p. 95 / 124 / 35 parallel to the vertical plane of the RVP receptacle.

[0093] With reference to Figure 12A, according to some embodiments of the subject matter of the present application, the engagement protrusion of the receptacle 90 may include two opposing lateral protrusion surfaces 92 that incline inward (i.e., towards the central geometric axis of the receptacle E) in directions opposite to the width of the engagement protrusion of the receptacle 90, so that they converge towards each other. The two lateral protrusion surfaces 92 may intersect. The longitudinal geometric axis of the protrusion R may be defined by the intersection of the two lateral protrusion surfaces 92.

[0094] According to some embodiments of the subject matter of the present application, the engagement protrusion of the receptacle 90 may include a convex curved portion of protrusion 94. The convex curved portion of protrusion 94 may connect the two lateral surfaces of protrusion 92. The convex curved portion of protrusion 94 may extend along the longitudinal geometric axis of protrusion R. The convex curved portion of protrusion 94 contains the highest point of the engagement protrusion of the receptacle 90.

[0095] According to some embodiments of the subject matter of the present application, the pin receptacle 80 may have a basic shape corresponding to that of the coupling pin 38 (being at least slightly smaller to allow free insertion into it). That is, the pin receptacle 80 may have a kidney-shaped profile in a front view of the tool shank 24, 124 (i.e., Figure 12A), and the pin receptacle 80 may therefore exhibit only 360° rotational symmetry around the central geometric axis of the receptacle E. Thus, the pin receptacle 80 is considered “rotational asymmetric” around the central geometric axis of the pin D.

[0096] With reference to Figure 12B, the convex curved portion of protrusion 94 can be defined by a convex radius of protrusion RR. The convex radius of protrusion RR can satisfy the condition: 2.8 mm < RR < 3.6 mm. Petition 870250073516, dated 08 / 20 / 2025, p. 96 / 124 / 35 Preferably, the convex radius of the protrusion RR can be equal to 3.2 mm. The convex radius of the protrusion RR can have the same value as the concave radius of the groove GR.

[0097] The convex curved portion of protrusion 94 has a convex portion width RCW. The convex portion width RCW is measured along the horizontal geometric axis of protrusion HR. According to some embodiments of the subject matter of the present application, the convex portion width RCW may satisfy the condition: 2.84 mm < RCW < 3.24 mm. Preferably, the convex portion width RCW may be equal to 3.04 mm. The convex portion width RCW may be constant along the longitudinal geometric axis of protrusion R.

[0098] The engagement protrusion of the receptacle 90 has a protrusion height RH. The protrusion height RH is measured along the vertical geometric axis of the pin VP (between the nearest and farthest points of the engagement protrusion of the receptacle relative to the median plane of the receptacle MR). According to some embodiments of the subject matter of the present application, the protrusion height RH may satisfy the condition: 0.3 mm < RH < 0.7 mm. Preferably, the protrusion height RH may satisfy the condition: 0.4 mm < RH < 0.6 mm. More preferably, the protrusion height RH may be equal to 0.5 mm. The protrusion height RR may be constant along the longitudinal geometric axis of protrusion R.

[0099] The engagement protrusion of the receptacle 90 has a protrusion width RW. The protrusion width RW is measured along the horizontal geometric axis of protrusion HR (between the furthest points of the receptacle engagement protrusion on each side of the vertical plane of the receptacle RVP). According to some embodiments of the subject matter of the present application, the protrusion width RW may satisfy the condition: 5.0 mm < RW < 5.84 mm. Preferably, the protrusion width RW may be equal to 5.42 mm. The protrusion width RW may be constant along the Petition 870250073516, dated 08 / 20 / 2025, p. 97 / 124 / 35 longitudinal geometric axis of protrusion R. The width of protrusion RW may be greater than the width of the convex portion RCW.

[00100] With reference to Figure 9, the engagement protrusion of the receptacle 90 has a protrusion length RL. The protrusion length RL is measured along the central geometric axis of the receptacle E. According to some embodiments of the subject matter of the present application, the engagement protrusion of the receptacle 90 may extend lengthwise along the entire axial extent of the pin receptacle 80.

[00101] With reference to Figures 9 to 11, the cutting tool 20, 120 includes a clamping through hole 96 formed in either the peripheral surface of the head 36 or the peripheral surface of the shank 78 where the pin receptacle 80 is recessed. The clamping through hole 96 is designed to receive the fastening member 28, as discussed later in the description. According to the first embodiment, the clamping through hole 96 is formed in the peripheral surface of the shank 78, and according to the second embodiment, the clamping through hole 96 is formed in the peripheral surface of the head 36.

[00102] The clamping through hole 96 opens to the pin receptacle 80 in a receptacle through hole opening 98 (i.e., the clamping through hole 96 is formed in the same piece as the pin receptacle 80). Specifically, the receptacle through hole opening 98 is located on the upper surface of the receptacle 116. The receptacle through hole opening 98 is located opposite the receptacle engagement protrusion 90 around the central geometric axis of the receptacle E. Thus, according to some embodiments of the subject matter of the present application, the vertical plane of the receptacle RVP can intersect the receptacle through hole opening 98 and the receptacle engagement protrusion 90.

[00103] According to some embodiments of the subject matter of the present application, the cutting tool 20, 120 may include exactly one hole. Petition 870250073516, dated 08 / 20 / 2025, page 98 / 124 / 35 through hole 96. The through hole 96 may include an internal threaded portion 100. As shown in Figure 13, the through hole 96 may incline away from the first end surface of the rod 76a in a direction from the peripheral surface of the rod 78 to the through hole opening of the receptacle 98. The through hole 96 may incline at a hole inclination angle α relative to the vertical geometric axis of the receptacle VR. The hole inclination angle α may be greater than or equal to 6° and less than or equal to 10°. Preferably, the hole inclination angle α may be equal to 8°.

[00104] As seen in Figures 11 and 13, the tool shank 24, 124 includes the aforementioned axial contact surface of the shank 104 located on the first end surface of the shank 76a. According to some embodiments of the matter of the present application, the axial contact surface of the shank 104 may extend radially outward to the peripheral surface of the shank 78. The axial contact surface of the shank 104 may be planar and extend perpendicularly to the central geometric axis of the shank C.

[00105] According to some embodiments of the subject matter of the present application, the tool rod 24, 124 may include a threaded rod clamping hole 102 recessed into the first end surface of the rod 76a. The threaded rod clamping hole 102 may be located below the engagement protrusion of the receptacle 90 and / or be intercepted by the vertical plane of the receptacle RVP and / or the vertical geometric axis of the receptacle VR. The threaded rod clamping hole 102 is designed to receive a threaded clamping screw, as described later in the description.

[00106] With reference to Figure 13, according to some embodiments of the subject matter of the present application, the tool shank 24, 124 may include a shank cooling channel 106. The shank cooling channel 106 has a shank cooling channel inlet 107i and a Petition 870250073516, dated 08 / 20 / 2025, page 99 / 124 / 35 cooling channel outlet of rod 107o. The cooling channel outlet of rod 107o is in fluid communication with the cooling channel inlet of rod 107i via the cooling channel of rod 106. The cooling channel inlet of rod 107i is connected to a cooling fluid source. The cooling channel outlet of rod 107o may be located on the rear surface of receptacle 88.

[00107] Returning to Figure 1, according to some embodiments of the subject matter of the present application, the cutting tool 20, 120 may include exactly one fastening member 28. The fastening member 28 may be rigidly formed. The fastening member 28 may include an externally threaded portion 108. The fastening member 28 includes a clamping portion 110 designed to act on the clamping recess 58. The clamping portion 110 may be flat in shape. The clamping portion 110 and the externally threaded portion 108 may be disposed at opposite ends of the fastening member 28. In this non-limiting example shown in the drawings, the fastening member 28 is a stud bolt. Advantageously, the stud bolt does not project out of the through clamping hole 62.

[00108] The assembly of the cutting tool 20, 120 (i.e., the adjustment of the cutting tool 20, 120 to the locked position) is performed by executing the following steps. The coupling pin 38 is inserted into the pin receptacle 80 until the axial contact surface of the head 66 touches the axial contact surface of the rod 104. During insertion, the engagement protrusion of the receptacle 90 slides along the engagement groove of the pin 52. The coupling pin 38 can be inserted into the pin receptacle 80 only in a single rotational position around the central geometric axis of the head B. Then, the clamping member 28 is passed through the clamping through hole 96, so that the clamping portion 110 enters the pin receptacle 80 and contacts the clamping recess 58 on the clamping recess contact surface 60. Petition 870250073516, dated 08 / 20 / 2025, page 100 / 124 / 35

[00109] With reference to Figures 14 and 16, due to the orientation and position of the clamping recess contact surface 60, the additional insertion of the fastening member 28 generates a first and a second clamping force F1, F2 that act simultaneously on the clamping recess 58 of the coupling pin 38. As seen in Figure 14, the first clamping force F1 acts in the axial direction and forces the cutting head 22, 122 and the tool shank 24, 124 to move towards each other, so that the axial contact surface of the head 66 firmly contacts the axial contact surface of the shank 104. The second clamping force F2 acts in the downward direction and forces the cutting head 22, 122 downwards, so that the engagement groove of the pin 52 firmly contacts the engagement protrusion of the receptacle 90. Thus, the cutting head 22, 122 It is loosely connected to the tool rod 24, 124 by the clamping member 28.Advantageously, the groove / protrusion engagement prevents lateral displacement of the cutting head 22, 122, particularly in the lower region of the pin / receptacle, during cutting operations.

[00110] According to some embodiments of the subject matter of the present application, the concave curved portion of groove 56 may abut the convex curved portion of protrusion 94. Each pin side surface 50 may abut a respective receptacle side surface 199. The portion of the lower surface of pin 48 where the engagement groove of pin 52 is not located may be offset from the portion of the lower surface of receptacle 118 where the engagement protrusion of receptacle 90 is not located. In particular, the portion of the engagement groove of pin 52 where the concave curved portion of groove 56 is not located may be offset from the portion of the pin receptacle 80 where the convex curved portion of protrusion 90 is not located.

[00111] According to some embodiments of the subject matter of the present application, in the locked position, the external threaded portion 108 may be threaded into the internal threaded portion 100. Petition 870250073516, dated 08 / 20 / 2025, pages 101 / 124 / 35

[00112] For heavy cutting or grinding operations, where high cutting forces are present, a supplementary tightening screw 114 can be used to provide supplementary tightening of the cutting head 22, 122 to the tool shank 24, 124. In this configuration, in the locked position, the supplementary tightening screw 114 is located in the through clamping hole of the head 62 and threaded into the threaded clamping hole of the shank 102.

[00113] According to some embodiments of the subject matter of the present application, in the locked position of the cutting tool 20, 120, the cooling channel of the head 70 and the cooling channel of the shank 106 may be in fluid communication with each other. The inlet of the cooling channel of the head 72i may be aligned with the outlet of the cooling channel of the shank 107o. As seen in Figure 16, the cooling channel of the head 70 and the cooling channel of the shank 106 may be in fluid communication with each other by means of a cooling fluid reservoir 112 which is defined by a space formed between the coupling pin 38 and the pin receptacle 80.

[00114] It can be observed from the above that, in one embodiment, the coupling pin 38 is formed in the cutting head 22 and the pin receptacle 80 and the clamping through hole 96 are formed in the tool shank 24, while, in another embodiment, the coupling pin 38 is formed in the tool shank 124 and the pin receptacle 80 and the clamping through hole 96 are formed in the cutting head 122.

[00115] Note that, unlike cylindrical, square or oval coupling pins, the coupling pin of the invention can be inserted into the pin receptacle only in a rotational position.

[00116] It is also observed that, in the configuration where the upper surface of pin 46 is facing in the same direction as the housing seat surface 27a, the second clamping force F2 acts in a direction substantially normal to the housing seat surface 27a. Petition 870250073516, dated 08 / 20 / 2025, pp. 102 / 124 / 35

[00117] Furthermore, it is also noted that the rotary cutting tool 20, 120 described above is easy and quick to assemble. Although the subject matter of the present application has been described to some extent with a degree of particularity, it should be understood that various alterations and modifications may be made without departing from the spirit or scope of the invention as claimed below. For example, the tool rod 24, 124 may be formed from several parts connected together by means of a coupling mechanism of the type described above. Petition 870250073516, dated 08 / 20 / 2025, pp. 103 / 124

Claims

1 / 11 CLAIMS 1. Cutting tool (20, 120), with a central geometric tool axis (A) defining opposite forward and backward directions (Df, Dr), characterized in that the cutting tool (20, 120) includes: a cutting head (22, 122) comprising: a peripheral head surface (36) extending circumferentially around the central geometric tool axis (A) and forming a boundary of a first backward-facing head end surface (34a); an axial head contact surface (66) located on the first head end surface (34a); and an insert housing (27); a tool shank (24, 124) comprising: a peripheral surface of the shank (78) extending circumferentially around the central geometric axis of the tool (A) and forming a boundary of a first end surface of the shank (76a) facing forward;an axial contact surface of the rod (104) located on the first end surface of the rod (76a); and a coupling pin (38) projecting from one of the first end surfaces of the head (34a) and the first end surface of the rod (76a), the coupling pin (38) comprising: an outer peripheral surface of the pin (44) extending around a central geometric axis of the pin (D); a vertical geometric axis of the pin (VP) that is perpendicular to and intersects the central geometric axis of the pin (D), thus defining a vertical plane of the pin (PVP); a pin engagement groove (52) recessed in the surface Petition 870250073516, dated 20 / 08 / 2025, page. 104 / 124 2 / 11 outer peripheral of the pin (44) and extending from a free end of the pin (41) towards a fixed end of the pin (40) along a longitudinal geometric axis of the groove (G);and a recessed clamping recess (58) in the outer peripheral surface of the pin (44) opposite the pin engagement groove (52) around the central geometric axis of the pin (D); a pin receptacle (80) recessed in the other between the first end surface of the head (34a) and the first end surface of the rod (76a), the pin receptacle (80) comprising: an inner peripheral surface of the receptacle (86) extending around a central geometric axis of the receptacle (E); a vertical geometric axis of the receptacle (VR) that is perpendicular to and intersects the central geometric axis of the receptacle (E), thus defining a vertical plane of the receptacle (RVP); and a receptacle engagement protrusion (90) projecting from the inner peripheral surface of the receptacle (86) and extending from an open end of the receptacle (82) towards a bottom end of the receptacle (84) along a longitudinal geometric axis of protrusion (R);and a through clamping hole (96) formed in either the peripheral surface of the head (36) or the peripheral surface of the rod (78) wherein the pin receptacle (80) is recessed, and which opens into the pin receptacle (80) in a through hole opening of the receptacle (98) located opposite the engagement protrusion of the receptacle (90) around the central geometric axis of the receptacle (E), wherein: the cutting tool (20, 120) is adjustable between a released position and a locked position, and in the locked position: the coupling pin (38) is received in the pin receptacle (80); and Petition 870250073516, dated 20 / 08 / 2025, p. 105 / 124 3 / 11 a fastening member (28) passes through the clamping hole (96) and acts on the clamping recess (58) of the coupling pin (38), so that: the engagement groove of the pin (52) touches the engagement protrusion of the receptacle (90); the axial contact surface of the head (66) touches the axial contact surface of the rod (104);and the cutting head (22, 122) and the tool shank (24, 124) are loosely connected to each other.; 2. Cutting tool (20) according to claim 1, characterized in that: the coupling pin (38) projects from the first end surface of the head (34a); the pin receptacle (80) is recessed into the first end surface of the rod (76a); and the clamping through hole (96) is formed in the peripheral surface of the rod (78).

3. Cutting tool (20) according to claim 1 or 2, characterized in that: the engagement groove of the pin (52) comprises a curved concave groove portion (56) extending along the longitudinal geometric axis of the groove (G); the engagement protrusion of the receptacle (90) comprises a curved convex protrusion portion (94) extending along the longitudinal geometric axis of the protrusion (R); and in the locked position, the curved concave groove portion (56) rests against the curved convex protrusion portion (94).

4. Cutting tool (20, 120) according to any one of claims 1 to 3, characterized in that: Petition 870250073516, dated 20 / 08 / 2025, p. 106 / 124 4 / 11 the cutting tool (20, 120) comprises a single centrally disposed coupling pin (38) and a single centrally disposed pin receptacle (80).

5. Cutting tool (20, 120) according to any one of claims 1 to 4, characterized in that: the cutting tool (20, 120) comprises exactly a clamping member (28) and exactly a clamping through hole (96) for attaching the cutting head (22, 122) to the tool shank (24, 124); and the coupling pin (38) comprises exactly a clamping recess (58).

6. Cutting tool (20, 120) according to any one of claims 1 to 5, characterized in that: the clamping through hole (96) comprises an internally threaded portion (100); the clamping member (28) comprises an externally threaded portion (108); and in the locked position, the externally threaded portion (108) is threaded into the internally threaded portion (100).

7. Cutting tool (120) according to any one of claims 1 to 6, characterized in that: the coupling pin (38) projects from the first end surface of the rod (76a); the pin receptacle (80) is recessed into the first end surface of the head (34a); and the clamping through hole (96) is formed in the peripheral surface of the head (36).

8. Cutting head (22, 122), with a central geometric axis of the head (B) that defines opposite forward and backward directions (DF, DR), characterized in that the cutting head (22, 122) comprises: Petition 870250073516, dated 20 / 08 / 2025, page 107 / 124 5 / 11 a peripheral surface of the head (36) that extends circumferentially around the central geometric axis of the head (B) and that forms a boundary of a first end surface of the head (34a) facing backward; an axial contact surface of the head (66) located on the first end surface of the head (34a); an insert housing (27); and / or: a coupling pin (38) projecting from the first end surface of the head (34a), the coupling pin (38) comprising: an outer peripheral surface of the pin (44) extending around a central geometric axis of the pin (D);a vertical geometric axis of the pin (VP) that is perpendicular to and intersects the central geometric axis of the pin (D), thus defining a vertical plane of the pin (PVP); a pin engagement groove (52) recessed into the outer peripheral surface of the pin (44) and extending from a free end of the pin (41) towards a fixed end of the pin (40) along a longitudinal geometric axis of the groove (G); and a clamping recess (58) recessed into the outer peripheral surface of the pin (44) opposite the pin engagement groove (52) around the central geometric axis of the pin (D); or; a pin receptacle (80) recessed into the first end surface of the head (34a), the pin receptacle (80) comprising: an inner peripheral surface of the receptacle (86) extending around a central geometric axis of the receptacle (E);a vertical geometric axis of the receptacle (VR) that is Petition 870250073516, dated 08 / 20 / 2025, page 108 / 124 6 / 11 perpendicular to and intersects the central geometric axis of the receptacle (E), thus defining a vertical plane of the receptacle (RVP); and a receptacle engagement protrusion (90) that projects from the inner peripheral surface of the receptacle (86) and extends from an open end of the receptacle (82) towards a bottom end of the receptacle (84) along a longitudinal geometric axis of protrusion (R); and a through hole (96) recessed into the peripheral surface of the head (36) and opening into the pin receptacle (80) in a through hole opening of the receptacle (98) located opposite the engagement protrusion of the receptacle (90) around the central geometric axis of the receptacle (E).; 9. Cutting head (22) according to claim 8, characterized in that: the coupling pin (38) projects from the first end surface of the head (34a).

10. Cutting head (22, 122) according to claim 9, characterized in that: the engagement groove of the pin (52) comprises two opposite side groove surfaces (54) that incline inwards in directions opposite to the width of the engagement groove of the pin (52), so that they converge towards each other.

11. Cutting head (22, 122) according to claim 10, characterized in that: the two lateral groove surfaces (54) intersect.

12. Cutting head (22, 122) according to claim 10, characterized in that: the engagement groove of the pin (52) comprises a curved concave groove portion (56) that extends along the geometric longitudinal axis of the groove (G) and connects the two lateral groove surfaces (54).

13. Cutting head (22, 122) according to any one of claims 9 to 12, characterized in that: the engagement groove of the pin (52) extends lengthwise along the entire axial length of the coupling pin (38).

14. Cutting head (22, 122) according to any one of claims 9 to 13, characterized in that: the longitudinal geometric axis of the groove (G) is parallel to the central geometric axis of the pin (D).

15. Cutting head (22, 122) according to any one of claims 9 to 14, characterized in that it further comprises: a head cooling channel (70) with a head cooling channel inlet (72i) and a head cooling channel outlet (72o); wherein: the coupling pin (38) comprises a pin rear surface (42) bounded by the pin outer peripheral surface (44); and the head cooling channel inlet (72i) is located on the pin rear surface (42).

16. Cutting head (22, 122) according to claim 15, characterized in that: the engagement groove of the pin (52) extends to the rear surface of the pin (42).

17. Cutting head (22, 122) according to any one of claims 9 to 16, characterized in that: the outer peripheral surface of the pin (44) comprises Petition 870250073516, dated 20 / 08 / 2025, p. 110 / 124 8 / 11 upper and lower surfaces of the pin (46, 48) opposite and two opposite lateral surfaces of the pin (50) connecting the upper and lower surfaces of the pin (46, 48); the clamping recess (58) is located on the upper surface of the pin (46); and the clamping recess (58) comprises a clamping recess contact surface (60) that inclines towards a median plane of the pin (MP) containing the central geometric axis of the pin (D) and extends across the two opposite lateral surfaces of the pin (50), in a direction towards the first end surface of the head (34a).

18. Cutting head (22, 122) according to claim 17, characterized in that: the insert housing (27) comprises a housing seating surface (27a) configured to seat a cutting insert (26), the housing seating surface (27a) facing the same direction as the upper surface of the pin (46).

19. Tool shank (24, 124), with a central geometric axis of the shank (C) that defines opposite forward and backward directions (DF, Dr), characterized in that the tool shank (24) comprises: a peripheral surface of the shank (78) that extends circumferentially around the central geometric axis of the shank (C) and that forms a boundary of a first end surface of the shank (76a) facing forward; an axial contact surface of the shank (104) located on the first end surface of the shank (76a); and / or: a coupling pin (38) that projects from the first end surface of the shank (76a), the coupling pin (38) comprising: Petition 870250073516, dated 20 / 08 / 2025, page. 111 / 124 9 / 11 an outer peripheral surface of the pin (44) extending around a central geometric axis of the pin (D);a vertical geometric axis of the pin (VP) that is perpendicular to and intersects the central geometric axis of the pin (D), thus defining a vertical plane of the pin (PVP); a pin engagement groove (52) recessed into the outer peripheral surface of the pin (44) and extending from a free end of the pin (41) towards a fixed end of the pin (40) along a longitudinal geometric axis of the groove (G); and a clamping recess (58) recessed into the outer peripheral surface of the pin (44) opposite the pin engagement groove (52) around the central geometric axis of the pin (D); or; a pin receptacle (80) recessed into the first end surface of the rod (76a), the pin receptacle (80) comprising: an inner peripheral surface of the receptacle (86) extending around a central geometric axis of the receptacle (E);a vertical geometric axis of the receptacle (VR) that is perpendicular to and intersects the central geometric axis of the receptacle (E), thus defining a vertical plane of the receptacle (RVP); and a receptacle engagement protrusion (90) that projects from the inner peripheral surface of the receptacle (86) and extends from an open end of the receptacle (82) towards a bottom end of the receptacle (84) along a longitudinal geometric axis of protrusion (R); and a through clamping hole (96) recessed into the peripheral surface of the rod (78) and opening into the pin receptacle (80) in a through hole opening of the receptacle (98) located opposite the receptacle engagement protrusion (90) around the central geometric axis of Petition 870250073516, dated 20 / 08 / 2025, page. 112 / 124 10 / 11 receptacle (E).; 20. Tool rod (24) according to claim 19, characterized in that: the pin receptacle (80) is recessed in the first end surface of the rod (76a); and the clamping through hole (96) is formed in the peripheral surface of the rod (78).

21. Tool shaft (24, 124) according to claim 20, characterized in that: the engagement protrusion of the receptacle (90) comprises two opposing lateral protrusion surfaces (92) that incline inwards in directions opposite to the width of the engagement protrusion of the receptacle (90), so that they converge towards each other.

22. Tool shank (24, 124) according to claim 21, characterized in that: the two lateral protruding surfaces (92) intersect.

23. Tool shaft (24, 124) according to claim 21, characterized in that: the engagement protrusion of the receptacle (90) comprises a convex curved portion of protrusion (94) extending along the longitudinal geometric axis of protrusion (R) and connecting the two lateral surfaces of protrusion (92).

24. Tool rod (24, 124) according to any one of claims 20 to 23, characterized in that: the engagement protrusion of the receptacle (90) extends lengthwise along the entire axial extent of the pin receptacle (80).

25. Tool shaft (24, 124) according to any one of claims 20 to 24, characterized in that: Petition 870250073516, dated 20 / 08 / 2025, p. 113 / 124 11 / 11 the longitudinal geometric axis of the protrusion (R) is parallel to the central geometric axis of the receptacle (E).

26. Tool rod (24, 124) according to any one of claims 20 to 25, characterized in that: the clamping through hole (96) is inclined away from the first end surface of the rod (76a) in a direction from the peripheral surface of the rod (78) to the through hole opening of the receptacle (98).

27. Tool rod (24, 124) according to any one of claims 20 to 26, characterized in that: the engagement protrusion of the receptacle (90) extends to the first end surface of the rod (76a).

28. Tool shank (24, 124) according to any one of claims 20 to 27, characterized in that: the clamping through hole (96) comprises an internal threaded portion (100). Petition 870250073516, dated 20 / 08 / 2025, pp. 114 / 124

Images