Tool Connector

Abstract

The tool coupler extends along a longitudinal axis and includes a first component, a second component, and a fastener for fastening the first component to the second component. The first component has a male fastening portion, the second component has a female fastening portion, and the fastener is located within an inner cavity of the second component. The male fastening portion has a first abutment region located axially rearward of a first plane perpendicular to the longitudinal axis, and the inner cavity has a second abutment region located axially forward of the first plane, with the first and second abutment regions facing toward the first plane. In a fastened state, the fastener first engagement region of the fastener is in fastening contact with the first abutment region of the male fastening portion, and the fastener second engagement region of the fastener is in fastening contact with the second abutment region of the inner cavity.

Description

Technical Field

[0001] The present invention relates to use in metal cutting in general and in particular to tool connectors for turning operations.

Background Art

[0002] In the field of cutting tools used in turning operations, there are many examples of tool connectors, some of which have the cutting insert directly connected to the tool holder, and others in which a tool adapter that houses the cutting insert is connected to the tool shank.

[0003] US5,873,682 discloses a tool holder comprising a body in which a passage for receiving fingers extending from a head is formed. The fingers are fixed within the passage by assembly screws that enable the head to move relative to the body between a retracted position and an extended position. When the head is in the extended position, the head is pivotable relative to the body. However, when the head is in the retracted position, a pair of shoulders on the body engage a pair of notches on the head to prevent the head from pivoting. A locking screw for locking the head to the body is also provided. The locking screw is designed such that when the locking screw is tightened, the head is biased against the body, thus providing a clear and known position for the insert each time the head moves.

[0004] US 6,270,293 B2 discloses an apparatus for releasably holding a tool holder. The apparatus includes a tool support member having a forward face, a hole along a longitudinal axis, and a passageway. The hole intersects the forward face and extends rearward from the forward face to receive the tool holder, and the passageway extends through the tool support member and intersects the longitudinal axis. An actuating bolt extends into the passageway through the tool support member and is reciprocable between a locking position and a release position along a radial axis relative to the longitudinal axis to lock or remove a shank from the tool support member. The actuating bolt has a locking section that abuts a locking surface of the shank of the tool holder, biases the locking surface rearward, and locks the tool holder within the tool support member.

[0005] EP 3,292,931 A1 discloses a cutting tool having a base holder and an exchangeable head. The exchangeable head supports a cutting edge and has a pin that is inserted into a corresponding recess at one end of the base holder. A fastening jaw attached to one side of the base holder fastens the pin into the recess by a base holder screw. The pin includes at least one support surface for receiving a pressure surface provided on a fastening claw.

Summary of the Invention

Problems to be Solved by the Invention

[0006] It is an object of the present invention to provide an improved tool coupler.

[0007] It is also an object of the present invention to provide a tool coupler having a fairly strong and stable fastening configuration.

[0008] It is a further object of the present invention to provide a tool coupler having fairly small fastening means.

[0009] It is still a further object of the present invention to provide a tool coupler suitable for use in Swiss-type turning operations.

Means for Solving the Problems

[0010] According to the present invention, a tool coupler is provided. The tool coupler extends in the front-rear direction along a longitudinal axis and has a first plane perpendicular to the longitudinal axis and a second plane including the longitudinal axis and intersecting the first plane. The second plane has an upper side defining the upward direction of the tool coupler and a lower side opposite the upper side, defining the downward direction of the tool coupler. The tool coupler includes a first component, a second component, and a fastener for fastening the first component to the second component The first component has a first body portion and a male fastening portion extending rearward from a rear mating end of the first body portion. The second component has a second body portion, a female fastening portion, and an inner cavity. The female fastening portion opens at a front mating end of the second body portion, and the inner cavity communicates with the female fastening portion. The fastener is located within the inner cavity and has a front engaging portion of the fastener and a rear driving portion of the fastener. The front engaging portion of the fastener has a first engaging region of the fastener and a second engaging region of the fastener. The male fastening portion closes the female fastening portion and has a first contact region located axially rearward of the first plane. The inner cavity has a second contact region located axially forward of the first plane. The second contact region is located on the upper side of the second plane. Each of the first contact region and the second contact region faces the first plane. In the fastened state of the tool coupler, the rear mating surface of the rear mating end is in fastening contact with the front mating surface of the front mating end. The first engaging region of the fastener is in fastening contact with the first contact region of the male fastening portion. The second engaging region of the fastener is in fastening contact with the second contact region of the inner cavity.

[0011] Next, for better understanding, the present invention will be described merely by way of example with reference to the accompanying drawings. The dashed lines represent the interrupted boundary lines of the partial views of the members.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10a

Figure 10b

Figure 11

Figure 12

Figure 13a

Figure 13b

DETAILED DESCRIPTION OF THE INVENTION

[0013] As shown in FIGS. 1 and 2, the present invention relates to a tool coupler 20, which extends in the forward direction DF - rearward direction DR along the longitudinal axis A1, and includes a first component 22 (front component 22), a second component 24 (rear component 24), and a fastener 26 for fastening the first component 22 to the second component 24.

[0014] In some embodiments of the present invention, the second component 24 and the fastener 26 can be manufactured from tool steel.

[0015] Also, in some embodiments of the present invention, the second component 24 and the fastener 26 can be produced by additive manufacturing.

[0016] As shown in FIGS. 1 - 4, the first component 22 has a first body portion 28 and a male fastening portion 30, and the male fastening portion 30 extends in the rearward direction DR from the rear mating end 32 of the first body portion 28.

[0017] As shown in FIGS. 1, 2, 5, and 6, the second component 24 has a second body portion 34, a female fastening portion 36, and an inner cavity 38. The female fastening portion 36 opens at the front mating end 40 of the second body portion 34, and the inner cavity 38 communicates with the female fastening portion 36.

[0018] As shown in FIGS. 1, 2, 7, and 8, the fastener 26 is disposed within the inner cavity 38 and has a front engaging portion 42 of the fastener and a rear driving portion 44 of the fastener.

[0019] In some embodiments of the present invention, the rear driving portion 44 of the fastener can be located distally from the front engaging portion 42 of the fastener.

[0020] In some embodiments of the present invention, the fastener 26 can be a single integral structure.

[0021] As shown in FIGS. 9 to 12, when assembling the tool coupler 20, the male fastening portion 30 closes the female fastening portion 36, the first contact region 46 of the male fastening portion 30 is located axially rearward of the first plane P1 orthogonal to the longitudinal axis A1, and the second contact region 48 of the inner cavity 38 is located axially forward of the first plane P1.

[0022] In some embodiments of the present invention, the first plane P1 passes through the female fastening portion 36 and the inner cavity 38.

[0023] As shown in FIGS. 10b and 12, each of the first contact region 46 and the second contact region 48 faces the first plane P1.

[0024] It should be understood that the use of the term "faces" throughout the specification and claims refers to a surface region that at least partially faces a certain plane, and it is not necessary for the surface region to be orthogonal to the plane.

[0025] In some embodiments of the present invention, the male fastening portion 30 may include a first relief groove 50 with respect to the forward direction DF, and the first contact region 46 may extend along the first relief groove 50. Thanks to the first relief groove 50, the rearward male fastening portion 30 may be provided with a male hook 31 that protrudes in the rearward direction DR in the tool coupler 20.

[0026] It should be understood that the use of the term "relief groove" throughout the specification and claims refers to a groove or recess, and a straight line extending in a specific direction away from a given region of the groove or recess intersects another region of the same groove or recess.

[0027] In some embodiments of the present invention, the first contact region 46 may extend between the opposing first outer surface 52a and the second outer surface 52b of the male fastening portion 30.

[0028] Also, in some embodiments of the present invention, the first contact region 46 may intersect the first outer surface 52a and the second outer surface 52b.

[0029] As shown in FIG. 4, the first outer surface 52a and the second outer surface 52b can be flat surfaces.

[0030] In some embodiments of the present invention, the inner cavity 38 may include a second relief groove 54 with respect to the rearward direction DR, and the second contact region 48 may extend along the second relief groove 54.

[0031] Also, in some embodiments of the present invention, the second contact region 48 may extend between the first inner surface 56a and the second inner surface 56b of the inner cavity 38, but it should be understood that the second contact region 48 does not have to extend across the entire distance between the first inner surface 56a and the second inner surface 56b.

[0032] The tool connector 20 has a second plane P2, the second plane P2 includes the longitudinal axis A1, and intersects the first plane P1. The second plane P2 has an upper side SU that defines the upward direction DU of the tool connector 20 and a lower side SL that is on the opposite side of the upper side SU and defines the downward direction DD of the tool connector 20. The upward direction DU and the downward direction DD are opposite to each other and orthogonal to the second plane P2.

[0033] In some embodiments of the present invention, the second plane P2 may be orthogonal to the first plane P1.

[0034] As shown in FIGS. 10a, 10b, and 12, the second contact region 48 is located on the upper side SU of the second plane P2.

[0035] In some embodiments of the present invention, the second contact region 48 may face the second plane P2.

[0036] Also, in some embodiments of the present invention, the first contact region 46 may be located on the lower side SL of the second plane P2.

[0037] Furthermore, in some embodiments of the present invention, the first contact region 46 may face the second plane P2.

[0038] As shown in FIGS. 10 to 12, in the fastened state of the tool coupler 20, The rear mating surface 58 of the rear mating end portion 32 of the first component 22 is in fastening contact with the front mating surface 60 of the front mating end portion 40 of the second component 24. The first engagement region 62 of the coupler front engagement portion 42 of the coupler is in fastening contact with the first contact region 46 of the male fastening portion. The second engagement region 64 of the coupler front engagement portion 42 of the coupler is in fastening contact with the second contact region 48 of the inner cavity.

[0039] It should be understood that in the fastened state of the tool coupler 20, the coupler front engagement portion 42 can partially block the female fastening portion 36.

[0040] As shown in FIGS. 9 and 10a, the rear mating surface 58 can define a third plane P3 that is parallel to the first plane P1 and axially forward of the first plane P1.

[0041] It should be understood that in the case of an embodiment of the present invention in which the first contact region 46 and the second contact region 48 are disposed on the lower side SL and the upper side SU opposite to the second plane P2, respectively, the risk that the coupler front engagement portion 42 gets clogged or caught can be minimized.

[0042] As shown in FIGS. 1, 2, 7, and 8, the fastener 26 can have opposing first lateral surfaces 66a and second lateral surfaces 66b, and the first engagement region 62 and the second engagement region 64 of the fastener can extend between the first lateral surface 66a and the second lateral surface 66b.

[0043] In some embodiments of the present invention, the second engagement region 64 of the fastener can intersect the first lateral surface 66a and the second lateral surface 66b.

[0044] Also, in some embodiments of the present invention, the first fastening side surface 66a and the second fastening side surface 66b can be planes.

[0045] As shown in FIGS. 10a, 10b, and 12, the horizontal axis A2 is defined by the intersection line of the first plane P1 and the second plane P2.

[0046] In some embodiments of the present invention, the first contact region 46 and the second contact region 48 may extend along the direction of the horizontal axis A2.

[0047] As shown in FIGS. 4 and 9, the first contact region 46 may have a first horizontal range EL1, and in some embodiments of the present invention, the first engagement region 62 of the fastener may correspondingly extend along the first horizontal range EL1.

[0048] It should be understood that in an embodiment of the present invention where the first contact region 46 intersects the first outer surface 52a and the second outer surface 52b of the male fastening portion, the first horizontal range EL1 may correspond to the width of the male connecting portion 30, that is, the distance between the first outer surface 52a and the second outer surface 52b.

[0049] As shown in FIGS. 6 and 9, the second contact region 48 may have a second horizontal range EL2, and in some embodiments of the present invention, the second engagement region 64 of the fastener may correspondingly extend along the second horizontal range EL2.

[0050] It should be understood that in an embodiment of the present invention where the second engagement region 64 of the fastener intersects the first horizontal surface 66a and the second horizontal surface 66b of the fastener, the second horizontal range EL2 may correspond to the width of the fastener 26, that is, the distance between the first horizontal surface 66a and the second horizontal surface 66b.

[0051] In some embodiments of the present invention, the second horizontal range EL2 may be larger than the first horizontal range EL1, that is, EL2>EL1.

[0052] Also, in some embodiments of the present invention, the first contact region 46 and the second contact region 48 may extend parallel to each other along the direction of the horizontal axis A2.

[0053] It should be understood that in an embodiment of the present invention where the first contact region 46 and the second contact region 48 extend parallel to each other along the direction of the horizontal axis A2, a fairly stable fastening configuration can be achieved.

[0054] As shown in FIGS. 9, 10a, and 10b, a fourth plane P4 orthogonal to the first plane P1 and the second plane P2 may intersect the first contact region 46 and the second contact region 48.

[0055] In some embodiments of the present invention, the fourth plane P4 may include the longitudinal axis A1.

[0056] As shown in FIGS. 10a and 10b, in a cross-sectional view taken along the fourth plane P4, the first engaging region 62 of the fastener may be in fastening contact with the first contact region 46, and the second engaging region 64 of the fastener may be in fastening contact with the second contact region 48.

[0057] In some embodiments of the present invention, the first contact region 46 and the second contact region 48 may exhibit mirror symmetry about the fourth plane P4.

[0058] Also, in some embodiments of the present invention, the front engaging portion 42 of the fastener may exhibit mirror symmetry about the fourth plane P4.

[0059] It should be understood that in embodiments of the present invention where the first contact region 46 and the second contact region 48 exhibit mirror symmetry about the fourth plane P4, a fairly stable fastening configuration can be achieved.

[0060] As shown in FIG. 10b, in a cross-sectional view taken along the fourth plane P4, the first contact region 46 and the second contact region 48 each have a first tangent line TL1 and a second tangent line TL2, and in some embodiments of the present invention, the first tangent line TL1 and the second tangent line TL2 may extend in the upward direction DU.

[0061] It should be understood that in embodiments of the present invention where the first tangent line TL1 and the second tangent line TL2 extend in the upward direction DU, the first engaging region 62 and the second engaging region 64 of the fastener of the fastener engaging portion form a wedge shape corresponding to each of the first contact region 46 and the second contact region 48.

[0062] As shown in FIG. 10b, in the cross-sectional view taken in the fourth plane P4, the first tangent line TL1 can form a first outer contact acute angle β1 with the first plane P1.

[0063] In some embodiments of the present invention, the first contact angle β1 can be less than 45 degrees, i.e., β1 < 45°.

[0064] Also, as shown in FIG. 10b, in the cross-sectional view taken in the fourth plane P4, the second tangent line TL2 can form a second outer contact acute angle β2 with the first plane P1.

[0065] In some embodiments of the present invention, the second contact angle β2 can be less than 45 degrees, i.e., β2 < 45°.

[0066] It should be understood that the use of the term "outer contact angle" refers to the angle between the contact area and the plane measured outside the member on which the contact area is formed throughout the specification and the claims.

[0067] As shown in FIGS. 10a, 10b and 12, the inner cavity 38 can have a third contact area 68 located axially rearward of the first plane P1.

[0068] In some embodiments of the present invention, the third contact area 68 can be located axially rearward of the first contact area 46.

[0069] Also, in some embodiments of the present invention, the third contact area 68 can be spaced apart from the second contact area 48.

[0070] Furthermore, in some embodiments of the present invention, the third contact area 68 can extend along the direction of the transverse axis A2.

[0071] In the fastened state of the tool connector 20, the third engagement area 70 of the forward engaging portion 42 of the fastener can be in fastening contact with the third contact area 68 of the inner cavity.

[0072] In some embodiments of the present invention, the third engagement region 70 of the fastener may extend between the first lateral surface 66a and the second lateral surface 66b of the fastener.

[0073] As shown in FIGS. 9, 10a, and 10b, the fourth plane P4 may intersect the third abutment region 68.

[0074] As shown in FIGS. 10a and 10b, in a cross-sectional view taken along the fourth plane P4, the third engagement region 70 of the fastener may be in abutting contact with the third abutment region 68.

[0075] In some embodiments of the present invention, the third abutment region 68 may exhibit mirror symmetry about the fourth plane P4.

[0076] As shown in FIGS. 1 to 3 and 10a, the first body portion 28 may have a front cutting end 72 that is axially opposite to the rear mating end 32 along the longitudinal axis A1.

[0077] In some embodiments of the present invention, the front cutting end 72 may have an insert receiving pocket 74, and a cutting insert 76 having at least one cutting edge 78 may be removably fixed within the insert receiving pocket 74 by an insert screw 79.

[0078] Also, in some embodiments of the present invention, the first component 22 may be manufactured from tool steel.

[0079] Furthermore, in some embodiments of the present invention, the first component 22 may be generated by additive manufacturing.

[0080] Still further, in some embodiments of the present invention, the cutting insert 76 can be manufactured by compacting and sintering a cemented carbide such as tungsten carbide, and may or may not be coated.

[0081] In the case of an embodiment of the present invention configured with the front cutting end 72, the tool connector 20 may be described as a cutting tool 80.

[0082] In some embodiments of the present invention, the cutting tool 80 can be used in a turning operation.

[0083] As shown in FIGS. 5, 6, 9, and 11, the second component 24 can have opposing first and second outer peripheral side surfaces 82a and 82b.

[0084] In some embodiments of the present invention, as shown in FIG. 5, the first outer peripheral side surface 82a can include a recessed floor surface 84, and the inner cavity 38 can open into the floor surface 84 to form a lateral opening 86.

[0085] It should be understood that in embodiments of the present invention where the inner cavity 38 opens into the floor surface 84, during pre-assembly of the tool coupler 20, the fastener 26 can be slidably inserted into the inner cavity 38 through the lateral opening 86.

[0086] As shown in FIGS. 2 and 11, the lateral opening 86 can be closed by a lateral panel 88 so that the fastener 26 does not inadvertently slide out of the inner cavity 38.

[0087] In some embodiments of the present invention, the lateral panel 88 can be removably fastened to the floor surface 84 by panel screws 90.

[0088] Also, in some embodiments of the present invention, the lateral panel 88 can have an outer panel surface 92, and when fastening the lateral panel 88 to the floor surface 84, the outer panel surface 92 can be flush with the first outer peripheral side surface 82a.

[0089] Furthermore, in some embodiments of the present invention, the lateral panel 88 can have an inner panel surface 94, and the first inner surface 56a of the inner cavity 38 can be formed on the inner panel surface 94.

[0090] In other embodiments of the present invention (not shown), the second component 24 and the fastener 26 can be simultaneously produced by additive manufacturing such that the fastener 26 can be positioned in a state of being confined within the inner cavity 38.

[0091] In the case of an embodiment of the present invention where the fastener 26 is positioned enclosed within the inner cavity 38, the second component 24 may not have a lateral opening, and it should be understood that the fastener 26 can be permanently enclosed within the inner cavity 38.

[0092] It should be understood that simultaneously generating the second component 24 and the fastener 26 by additive manufacturing can result in a more cost-effective manufacturing method than conventional manufacturing methods.

[0093] As shown in FIG. 9, in the top view of the tool coupler 20, the horizontal axis A2 may intersect the first outer peripheral side surface 82a and the second outer peripheral side surface 82b and define the body width WB.

[0094] In some embodiments of the present invention, at least one of the first lateral range EL1 and the second lateral range EL2 may be greater than one-third of the body width WB, i.e., EL1 > WB / 3 and / or EL2 > WB / 3.

[0095] It should be understood that in embodiments of the present invention where the first contact region 46 and the second contact region 48 extend along the direction of the horizontal axis A2 and at least one of the first lateral range EL1 and the second lateral range EL2 is greater than one-third of the body width WB, a fairly strong and stable fastening configuration can be achieved.

[0096] In some embodiments of the present invention, each of the first lateral range EL1 and the second lateral range EL2 may be greater than half of the body width WB, i.e., EL1 > WB / 2 and EL2 > WB / 2.

[0097] It should be understood that in other embodiments of the present invention (not shown), at least one of the first contact region 46 and the second contact region 48 may include a plurality of sub-contact regions spaced apart along the direction of the horizontal axis A2. In such embodiments, any gap between the sub-contact regions may be ignored when measuring the first lateral range EL1 and the second lateral range EL2.

[0098] As shown in FIGS. 5, 10a, and 11, the second component 24 may include a threaded hole 96 in which the hole axis A3 intersects the second plane P2.

[0099] In some embodiments of the present invention, the hole axis A3 may be perpendicular to the second plane P2.

[0100] Also, in some embodiments of the present invention, the hole axis A3 may be included within the fourth plane P4.

[0101] As shown in FIGS. 5, 6, 10 to 12, the second component 24 may have opposing lower outer peripheral surface 98 and upper outer peripheral surface 100.

[0102] In some embodiments of the present invention, the lower outer peripheral surface 98 and the upper outer peripheral surface 100 may be separated by the first outer peripheral side surface 82a and the second outer peripheral side surface 82b, and the second component 24 may have a square or rectangular outer shape.

[0103] Also, in some embodiments of the present invention, the threaded hole 96 may open to the lower outer peripheral surface 98 at the hole lower opening 102.

[0104] Furthermore, in some embodiments of the present invention, as shown in FIGS. 10 and 12, the lower outer peripheral surface 98 and the second contact region 48 may be located on both sides of the second plane P2.

[0105] As shown in FIGS. 10a and 10b, in some embodiments of the present invention, the threaded hole 96 may be completely located axially behind the first contact region 46.

[0106] In some embodiments of the present invention, the threaded hole 96 may be located axially behind the third contact region 68.

[0107] Also, in some embodiments of the present invention, the threaded hole 96 may communicate with the inner cavity 38.

[0108] In the case of an embodiment of the present invention where the fastener 26 is positioned enclosed within the inner cavity 38 (not shown), it should be understood that the only means of communication to the inner cavity 38 can be provided by the female fastening portion 36 and the threaded hole 96.

[0109] As shown in FIG. 10a, the hole axis A3 intersects the upper outer peripheral surface 100 and the lower hole opening 102, and may define the body height HB. The lower hole opening 102 may have a hole center point NB located at a first longitudinal distance DL from the rear mating surface 58.

[0110] In some embodiments of the present invention, the first longitudinal distance DL may be less than twice the body height HB, i.e., DL < 2×HB.

[0111] Also, in some embodiments of the present invention, the first longitudinal distance DL may be less than the body height HB, i.e., DL < HB.

[0112] As shown in FIGS. 10a and 11, a threaded member 104 having a threaded axis A4 coaxial with the hole axis A3 may be screwed into the threaded hole 96.

[0113] In some embodiments of the present invention, the first threaded end 106 of the threaded member 104 may have a thread receiver 108 that allows the threaded member 104 to be engaged and rotated about the threaded axis A4 by a torque key (not shown).

[0114] Also, in some embodiments of the present invention, the thread receiver 108 may be accessible from the lower outer peripheral surface 98 of the second component.

[0115] In the case of the embodiment of the present invention where the tool connector 20 is configured as the cutting tool 80, it should be understood that the hole center point NB being located at the first longitudinal distance DL which is less than twice the body height HB from the rear mating surface 58 can be quite advantageous in machining configurations, for example, in Swiss-type turning operations. In this machining configuration, the cutting tool 80 is preferably assembled in a tool holder (not shown) with restricted access and has a minimum overhang of the front cutting end 72 from the tool holder, while still providing access to the thread receiver 108.

[0116] In other embodiments of the present invention (not shown), the second component 24 and the screw member 104 can be simultaneously produced by additive manufacturing, and the screw member 104 can be positioned in a confined state within the second component 24.

[0117] In some embodiments of the present invention, as shown in FIG. 9, by rotating the screw member 104 around the screw axis A4 in the first screw direction DS1, the rear drive portion 44 of the fastener can be actuated to facilitate the fastening of the tool connector 20.

[0118] Also, in some embodiments of the present invention, as shown in FIGS. 9 to 11, by rotating the screw member 104 around the screw axis A4 in the first screw direction DS1, the screw member 104 can travel upward DU along the hole axis A3.

[0119] Furthermore, in some embodiments of the present invention, as shown in FIGS. 10a, 10b, and 11, by rotating the screw member 104 around the screw axis A4 in the first screw direction DS1, the screw member 104 can apply an actuating force FA to the thrust surface 110 of the rear drive portion 44 of the fastener.

[0120] As shown in FIGS. 10b and 11, the actuating force FA can be directed upward DU.

[0121] Still further, in some embodiments of the present invention, the second screw end 112 of the screw member 104 can contact the thrust surface 110 when the actuating force FA is applied.

[0122] As shown in FIGS. 10a and 11, the second threaded end 112 of the threaded member can be on the axially opposite side of the first threaded end 106 along the thread axis A4.

[0123] In some embodiments of the present invention, the hole axis A3 may intersect the thrust surface 110.

[0124] Also, in some embodiments of the present invention, the rear drive portion 44 of the fastener may exhibit mirror symmetry about the fourth plane P4.

[0125] In the case of an embodiment of the present invention where the hole center point NB is located at a first longitudinal distance DL that is less than twice the body height HB from the rear mating surface 58 and the hole axis A3 intersects the thrust surface 110 of the fastener, it should be understood that the fastener 26 has a fairly small configuration and may be suitable for a tool coupler used in Swiss-type turning operations.

[0126] In the fastened state of the tool coupler 20, as shown in FIG. 12, in the side view of the tool coupler 20, the first contact region 46 and the thrust surface 110 may be located at a first distance D1 and a second distance D2 from the second contact region 48, respectively.

[0127] In the fastened state of the tool coupler 20, the second contact region 48 may act as a fulcrum, and it should be understood that about this fulcrum, the turning moment generated by the first component of the actuating force FA is converted into the first component of the fastening force FC applied to the first contact region 46.

[0128] As shown in FIG. 10b, the fastening force FC may be directed rearward DR.

[0129] In some embodiments of the present invention, the second distance D2 may be greater than the first distance D1, i.e., D2 > D1.

[0130] In the case of an embodiment of the present invention where the second distance D2 is greater than the first distance D1, it should be understood that the first component of the actuating force FA can be converted into the first component of the fastening force FC with a mechanical advantage.

[0131] Also, in some embodiments of the present invention, the second distance D2 can be greater than twice the first distance D1, i.e., D2 > 2×D1.

[0132] It should be understood that in embodiments of the present invention where the second distance D2 is greater than twice the first distance D1, the first component of the actuating force FA can be converted into the first component of the fastening force FC with a significant mechanical advantage, and a fairly robust fastening configuration can be achieved.

[0133] As shown in FIG. 12, in the side view of the tool coupler 20, the first distance D1 and the second distance D2 can be measured along the respective virtual first straight line L1 and second straight line L2.

[0134] Also, in some embodiments of the present invention, the virtual first straight line L1 can form a virtual first acute angle α1 with the longitudinal axis A1, and the virtual first angle α1 can be greater than 45 degrees, i.e., α1 > 45°.

[0135] The first moment arm length LM1 (not shown) associated with the first distance D1 is equal to the first distance D1 multiplied by the sine of the virtual first angle α1, i.e., LM1 = D1×sin α1. Therefore, it should be understood that in embodiments of the present invention where the virtual first angle α1 is greater than 45 degrees, the turning moment associated with the first moment arm length LM1 can be advantageously increased.

[0136] [[ID=2N]]

[0137] ​The second moment arm length LM2 (not shown) associated with the second distance D2 is equal to the second distance D2 multiplied by the sine of the virtual second angle α2, i.e., LM2 = D2 × sin α2. Therefore, it should be understood that in embodiments of the present invention where the virtual second angle α2 is greater than 60 degrees, the turning moment associated with the second moment arm length LM2 can be advantageously increased.

[0138] In the fastened state of the tool connector 20, as shown in FIG. 12, in a side view of the tool connector 20, the first contact region 46 and the thrust surface 110 can be located at a third distance D3 and a fourth distance D4, respectively, from the third contact region 68.

[0139] It should be understood that in the fastened state of the tool connector 20, the third contact region 68 can act as a fulcrum, and about this fulcrum, the turning moment generated by the second component of the actuating force FA is converted into the second component of the fastening force FC in the first contact region 46.

[0140] In some embodiments of the present invention, the fourth distance D4 can be greater than the third distance D3, i.e., D4 > D3.

[0141] It should be understood that in embodiments of the present invention where the fourth distance D4 is greater than the third distance D3, the second component of the actuating force FA can be converted into the second component of the fastening force FC with a mechanical advantage.

[0142] As shown in FIG. 12, in a side view of the tool connector 20, the third distance D3 and the fourth distance D4 can be measured along the respective virtual third straight line L3 and fourth straight line L4.

[0143] In some embodiments of the present invention, the virtual third straight line L3 can form a virtual third acute angle α3 with the longitudinal axis A1, and the virtual third angle α3 can be greater than 60 degrees, i.e., α3 > 60°.

[0144] The third moment arm length LM3 (not shown) associated with the third distance D3 is equal to the third distance D3 multiplied by the sine of the virtual third angle α3, i.e., LM3 = D3 × sin α3. Therefore, it should be understood that in the embodiments of the present invention where the virtual third angle α3 is greater than 60 degrees, the turning moment associated with the third moment arm length LM3 can be advantageously increased.

[0145] In some embodiments of the present invention, the fastener 26 may have a pivot axis A5, and the fastener 26 is rotatable about the pivot axis A5 during fastening and releasing of the tool connector 20.

[0146] As shown in FIGS. 9 to 12, the pivot axis A5 may be orthogonal to the longitudinal axis A1 and substantially parallel to the second plane P2.

[0147] In some embodiments of the present invention, the pivot axis A5 may be substantially parallel to the transverse axis A2.

[0148] Also, in some embodiments of the present invention, the pivot axis A5 may be fastened to the second component 24, and when viewed orthogonally to the second plane P2, during fastening and releasing of the tool connector 20, the pivot axis A5 may undergo translational movement with respect to the second component 24.

[0149] As shown in FIGS. 7 and 8, the first engagement region 62 and the second engagement region 64 of the fastener may be disposed on the respective first outer peripheral engagement surface 114 and the second outer peripheral engagement surface 116 of the opposing front engagement portion 42 of the fastener.

[0150] The fastener 26 has a fastener relief groove 51. Thanks to the connector relief groove 51, the front engagement portion 42 of the fastener includes a fastener hook 43 that protrudes in the forward direction DF in the tool connector 20.

[0151] In the fastened state, the fastener hook 43 is engaged with the male hook 31, and the rear mating surface 58 of the rear mating end 32 is in fastening contact with the front mating surface 60 of the front mating end 40. In the unfastened state, the fastener hook 43 is released from the male hook 31. When the screw member 104 operably engaged with the rear drive portion 44 of the fastener is actuated, the tool coupler 20 is adjustable between the fastened state and the unfastened state.

[0152] As shown in FIG. 8, in the side view of the fastener 26, the outside of the first outer peripheral engagement surface 114 may be concave, and the outside of the second outer peripheral engagement surface 116 may be convex.

[0153] Also, as shown in FIG. 8, in the side view of the fastener 26, the fastener 26 may be kidney bean-shaped.

[0154] It should be understood that in embodiments of the present invention in which the fastener 26 is configured with a complex surface shape, for example, the outside of the first outer peripheral engagement surface 114 is concave and the outside of the second outer peripheral engagement surface 116 is convex, producing the coupler 26 by additive manufacturing can result in a more cost-effective production method than conventional production methods.

[0155] As shown in FIG. 8, the side view of the fastener 26 may be taken along the pivot axis A5.

[0156] In some embodiments of the present invention, the first outer peripheral engagement surface 114 may comprise several concave sub-surfaces with different radii and having smooth transition portions therebetween.

[0157] It should be understood that in embodiments of the present invention in which the outside of the first outer peripheral engagement surface 114 is concave and has a smooth transition portion between concave sub-surfaces of different radii, the fastener 26 can transmit a high fastening force FC to the first contact region 46 in a state where the stress concentration in the vicinity of the first outer peripheral engagement surface 114 is at a minimum level.

[0158] In some embodiments of the present invention, the third engagement region 70 of the fastener may be disposed on the convex second outer peripheral engagement surface 116.

[0159] Also, in some embodiments of the present invention, in the side view of the fastener 26, as shown in FIG. 8, the pivot axis A5 may be located outside the fastener 26, and the concave first outer peripheral engagement surface 114 may face toward the pivot axis A5.

[0160] In the case of an embodiment of the present invention where the pivot axis A5 is not fastened to the second component 24 and the outside of the second outer peripheral engagement surface 116 is convex, it should be understood that the second engagement region 64 of the fastener and the third engagement region 70 of the fastener may temporarily slide along the second contact region 48 and the third contact region 68 of the inner cavity 38, respectively, during the fastening and release of the tool coupler 20.

[0161] As shown in FIG. 8, in the side view of the fastener 26, a virtual first circle C1 having a first diameter DA1 and a first center point NC1 circumscribes the fastener 26.

[0162] In some embodiments of the present invention, the second engagement region 64 of the fastener of the second outer peripheral engagement surface 116 may be on the virtual first circle C1.

[0163] As shown in FIG. 8, in the side view of the fastener 26, the pivot axis A5 may be located within a virtual second circle C2 having a second diameter DA2 and a second center point NC2.

[0164] In some embodiments of the present invention, the second center point NC2 may be the same as the first center point NC1.

[0165] Also, in some embodiments of the present invention, the pivot axis A5 does not have to be fastened to the second component 2 4 and, when viewed orthogonally to the second plane P2, during the fastening and release of the tool coupler 20, the pivot axis A5 may undergo a translational movement within the virtual second circle C2.

[0166] Furthermore, in some embodiments of the present invention, the second diameter DA2 may be made smaller than one-fourth of the first diameter DA1.

[0167] As shown in FIG. 8, in a side view of the fastener 26, the shortest distance between the second engagement region 64 of the second outer peripheral engagement surface 116 and the first outer peripheral engagement surface 114 may define the engagement portion thickness TE.

[0168] In some embodiments of the present invention, the engagement portion thickness TE may be greater than 20 percent of the first diameter DA1, i.e., TE > 0.20 × DA1.

[0169] It should be appreciated that in embodiments of the present invention where the engagement portion thickness TE is greater than 20 percent of the first diameter DA1, the fastener 26 may have a high level of rigidity and, thus, can transmit a high fastening force FC to the first contact region 46 with minimal flexure.

[0170] In some embodiments of the present invention, rotation of the screw member 104 about the screw axis A4 in the second screw direction DS2 may actuate the fastener rear drive portion 44 and facilitate release of the tool coupler 20.

[0171] As shown in FIG. 9, the second screw direction DS2 may be opposite to the first screw direction DS1 about the screw axis A4.

[0172] In some embodiments of the present invention, rotation of the screw member 104 about the screw axis A4 in the second screw direction DS2 may cause the screw member 104 to travel downwardly DD along the hole axis A3.

[0173] Also, in some embodiments of the present invention, as shown in FIGS. 13a and 13b, rotation of the screw member 104 about the screw axis A4 in the second screw direction DS2 may apply a release force FR to the retraction element 118 of the fastener rear drive portion 44.

[0174] As shown in FIG. 13b, the release force FR may be directed downwardly DD.

[0175] Furthermore, in some embodiments of the present invention, as shown in FIG. 13b, when a release force FR is applied to the retraction element 118 of the fastener, the fastener 26 can be rotated in a first rotation direction DW1 about a pivot axis A5.

[0176] As shown in FIGS. 7 and 8, the retraction element 118 can be spaced apart from the thrust surface 110.

[0177] In some embodiments of the present invention, as shown in FIGS. 12 and 13b, the retraction element 118 can be in the form of at least one retraction protrusion 120a, 120b extending transversely to the screw axis A4.

[0178] Also, in some embodiments of the present invention, as shown in FIG. 11, the retraction element 118 can include a first retraction protrusion 120a and a second retraction protrusion 120b located on both sides of a fourth plane P4.

[0179] As shown in FIGS. 13a and 13b, the screw member 104 can have a screw shoulder 122 adjacent to the second screw end 112, and the screw shoulder 122 can contact at least one of the retraction protrusions 120a, 120b when a release force FR is applied.

[0180] In some embodiments of the present invention, as shown in FIGS. 13a and 13b, by rotating the screw member 104 about the screw axis A4 in a second screw direction DS2, the second screw end 112 can be spaced apart from the thrust surface 110.

[0181] It should be understood that in embodiments of the present invention where the first engagement region 62 of the fastener and the second engagement region 64 of the fastener are respectively disposed on the opposing concave first outer peripheral engagement surface 114 and convex second outer peripheral engagement surface 116, the risk of the front engagement portion 42 of the fastener becoming clogged or caught can be minimized, and the magnitude of the release force FR can be made relatively small. This release force FR is required to rotate the screw member 104 in the second screw direction DS2 to facilitate the release of the tool coupler 20.

[0182] As shown in FIGS. 13a and 13b, in the unfastened state of the tool coupler 20, the forward engaging portion 42 of the fastener can be separated from the first contact region 46.

[0183] Also, as shown in FIGS. 13a and 13b, in the unfastened state of the tool coupler 20, the forward engaging portion 42 of the fastener can be separated from the entire male connecting portion 30 and can be located above the second plane P2 on the upper side SU.

[0184] Furthermore, as shown in FIGS. 13a and 13b, in the unfastened state of the tool coupler 20, the forward engaging portion 42 of the fastener can be separated from the second contact region 48.

[0185] In some embodiments of the present invention, in the unfastened state of the tool coupler 20, the first component 22 can be slidably removable from the second component 24 along the longitudinal axis A1.

[0186] It will be appreciated that during subsequent re-fastening of the tool coupler 20, by applying the operating force FA to the thrust surface 110 of the fastener, the fastener 26 can be rotated in the second rotation direction DW2 about the pivot axis A5.

[0187] As shown in FIGS. 10b and 13b, the second rotation direction DW2 can be opposite to the first rotation direction DW1 about the screw axis A5.

[0188] Although the present invention has been described in some detail, it is to be understood that various alternative forms and modifications can be made without departing from the spirit or scope of the invention as claimed below.

Claims

1. A tool coupler (20), wherein the tool coupler (20) extends in the forward direction (DF) - rearward direction (DR) along a longitudinal axis (A1), and has a first plane (P1) orthogonal to the longitudinal axis (A1), and a second plane (P2) including the longitudinal axis (A1) and orthogonal to the first plane (P1), and the second plane (P2) has an upper side (SU) defining the upward direction (DU) of the tool coupler (20) and a lower side (SL) opposite to the upper side (SU), defining the downward direction (DD) of the tool coupler (20), and the tool coupler (20) comprises a first component (22), a second component (24), and a fastener (26) for fastening the first component (22) to the second component (24), the first component (22) has a first body portion (28) and a male fastening portion (30) extending in the rearward direction (DR) from a rear mating end portion (32) of the first body portion (28), the second component (24) has a second body portion (34), a female fastening portion (36), and an inner cavity (38), the female fastening portion (36) opens at a front mating end portion (40) of the second body portion (34), and the inner cavity (38) communicates with the female fastening portion (36), the fastener (26) is located within the inner cavity (38) and has a front engaging portion (42) of the fastener and a rear driving portion (44) of the fastener, and the front engaging portion (42) of the fastener has a first engaging region (62) of the fastener and a second engaging region (64) of the fastener, the male fastening portion (30) closes the female fastening portion (36) and has a first abutting region (46) located axially rearward of the first plane (P1), the inner cavity (38) has a second abutting region (48) located axially forward of the first plane (P1), and the second abutting region (48) is located on the upper side (SU) of the second plane (P2), each of the first abutting region (46) and the second abutting region (48) faces the first plane (P1), in the fastened state of the tool coupler (20), a rear mating surface (58) of the rear mating end portion (32) is in fastening contact with a front mating surface (60) of the front mating end portion (40), the first engaging region (62) of the fastener is in fastening contact with the first abutting region (46) of the male fastening portion, The engaging region (64) of the second fastener is in fastening contact with the second abutting region (48) of the inner cavity, a tool coupler (20).

2. The second component (24) includes a threaded hole (96) in which a hole axis (A3) crosses the second plane (P2), A threaded member (104) having a threaded axis (A4) coaxial with the hole axis (A3) is screwed into the threaded hole (96), Rotation of the threaded member (104) around the threaded axis (A4) in a first threading direction (DS1) actuates the rear drive portion (44) of the fastener and facilitates fastening of the tool coupler (20), the tool coupler (20) according to claim 1.

3. By rotation of the threaded member (104) around the threaded axis (A4) in the first threading direction (DS1), the threaded member (104) advances along the hole axis (A3) in the upward direction (DU), the tool coupler (20) according to claim 2.

4. The second component (24) has opposing lower outer peripheral surfaces (98) and upper outer peripheral surfaces (100), The threaded hole (96) opens to the lower outer peripheral surface (98) at a hole lower opening (102), the tool coupler (20) according to claim 2.

5. The lower outer peripheral surface (98) and the second abutting region (48) are located on both sides of the second plane (P2), the tool coupler (20) according to claim 4.

6. The hole axis (A3) intersects the upper outer peripheral surface (100) and the hole lower opening (102) and defines a body height (HB), The hole lower opening (102) has a hole center point (NB) located at a first longitudinal distance (DL) from the rear mating surface (58), The first longitudinal distance (DL) is less than twice the body height (HB), the tool coupler (20) according to claim 4.

7. A transverse axis (A2) is defined by the intersection line of the first plane (P1) and the second plane (P2), and the first abutting region (46) and the second abutting region (48) extend along the direction of the transverse axis (A2), the tool coupler (20) according to claim 1.

8. The second component (24) has opposing first outer peripheral side surfaces (82a) and second outer peripheral side surfaces (82b), The transverse axis (A2) intersects the first outer peripheral side surface (82a) and the second outer peripheral side surface (82b) and defines a body width (WB), The first contact area (46) and the second contact area (48) each have a first lateral extent (EL1) and a second lateral extent (EL2), The tool coupler (20) according to claim 7, wherein at least one of the first lateral extent (EL1) and the second lateral extent (EL2) is greater than one third of the body width (WB).

9. The tool coupler (20) according to claim 8, wherein each of the first lateral extent (EL1) and the second lateral extent (EL2) is greater than half of the body width (WB).

10. By rotation of the threaded member (104) about the threaded shaft (A4) in the first threading direction (DS1), the threaded member (104) applies an actuating force (FA) to the thrust surface (110) of the rear drive portion (44) of the fastener, the tool coupler (20) according to claim 2.

11. In the fastened state of the tool coupler (20), in a side view of the tool coupler (20), The first contact area (46) and the thrust surface (110) are located at a first distance (D1) and a second distance (D2) respectively from the second contact area (48), The tool coupler (10) according to claim 10, wherein the second distance (D2) is greater than the first distance (D1).

12. The tool coupler (20) according to claim 11, wherein the second distance (D2) is greater than twice the first distance (D1).

13. The inner cavity (38) has a third contact area (68) located axially rearward of the first plane (P1), In the fastened state of the tool coupler (20), the third engagement area (70) of the fastener of the front engagement portion (42) of the fastener is in fastening contact with the third contact area (68) of the inner cavity, the tool coupler (20) according to claim 1.

14. The tool coupler (20) according to claim 13, wherein the third contact area (68) of the inner cavity is located axially rearward of the first contact area (46).

15. By rotation of the threaded member (104) about the threaded shaft (A4) in the second threading direction (DS2), the rear drive portion (44) of the fastener is actuated to facilitate release of the fastening of the tool coupler (20), the tool coupler (20) according to claim 2.

16. The tool coupler (20) according to claim 15, wherein rotation of the screw member (104) about the screw axis (A4) in the second screw direction (DS2) applies a release force (FR) to the retracting element (118) of the coupler rear drive portion (44).

17. In the unfastened state of the tool coupler (20), the front engaging portion (42) of the coupler is spaced apart from the entire male fastening portion (30) and is located on the upper side (SU) of the second plane (P2), the tool coupler (10) according to claim 15.

18. In the unfastened state of the tool coupler (20), the first component (22) is slidably removable from the second component (24) along the longitudinal axis (A1), the tool coupler (10) according to claim 15.

19. The coupler (26) has a pivot axis (A5), and the coupler (26) is rotatable about the pivot axis (A5), the tool coupler (20) according to claim 1.

20. The first engaging region (62) and the second engaging region (64) of the coupler are disposed on respective ones of the opposing first outer peripheral engaging surface (114) and second outer peripheral engaging surface (116) of the front engaging portion (42) of the coupler, in a side view of the coupler (26), the outside of the first outer peripheral engaging surface (114) is concave, and the outside of the second outer peripheral engaging surface (116) is convex, the tool coupler (20) according to claim 19.

21. In a side view of the coupler (26), a virtual first circle (C1) having a first diameter (DA1) and a first center point (NC1) circumscribes the coupler (26), the pivot axis (A5) is located within a virtual second circle (C2) having a second diameter (DA2) and a second center point (NC2), the second center point (NC2) is the same as the first center point (NC1), the second diameter (DA2) is less than one quarter of the first diameter (DA1), the tool coupler (10) according to claim 20.

22. In a side view of the coupler (26), the shortest distance between the second engaging region (64) of the second outer peripheral engaging surface (116) of the coupler and the first outer peripheral engaging surface (114) defines an engaging portion thickness (TE), the engaging portion thickness (TE) is greater than 20 percent of the first diameter (DA1), the tool coupler (20) according to claim 21.

23. In a side view of the fastener (26), the swivel axis (A5) is located outside the fastener (26), The concave first outer peripheral engagement surface (114) faces the swivel axis (A5), and the tool coupler (10) according to claim 20.

24. The swivel axis (A5) intersects the longitudinal axis (A1) and is substantially parallel to the second plane (P2), and the tool coupler (20) according to claim 19.

25. A tool coupler (20) extending in the forward direction (DF) - rearward direction (DR) along the longitudinal axis (A1), The tool coupler (20) is, A front component (22) having a first body portion (28) and a male fastening portion (30) extending from a rear mating end portion (32) of the first body portion (28) in the rearward direction (DR), the male fastening portion (30) being provided with a male hook (31) protruding in the rearward direction (DR), and the front component (22); A rear component (24) having a second body portion (34), a female fastening portion (36), and an inner cavity (38), the female fastening portion (36) opening at a front mating end portion (40) of the second body portion (34), and the inner cavity (38) communicating with the female fastening portion (36), and the rear component (24); A fastener (26) located within the inner cavity (38) Comprising, The fastener (26) has a fastener front engagement portion (42) and a fastener rear drive portion (44), The fastener front engagement portion (42) is provided with a fastener hook (43) protruding in the forward direction (DF), The male fastening portion (30) closes the female fastening portion (36), When the screw member (104) operably engaged with the fastener rear drive portion (44) is actuated, the tool coupler (20) is, The fastener hook (43) is engaged with the male hook (31), A fastened state in which a rear mating surface (58) of the rear mating end portion (32) is in fastened contact with a front mating surface (60) of the front mating end portion (40), It is adjustable between a released state in which the fastener hook (43) is released from the male hook (31), By the actuation of the screw member (104) around the screw axis (A4), the fastener (26) rotates around a swivel axis (A5) perpendicular to the longitudinal axis (A1), The swivel axis (A5) is not fastened to the rear component (24), and the tool coupler (20).

26. The tool coupler (20) according to claim 25, wherein during fastening and release of the tool coupler (20), the pivot axis (A5) undergoes a translational movement relative to the rear component (24).

27. The tool coupler (20) has a first plane (P1) perpendicular to the longitudinal axis (A1), and a second plane (P2) including the longitudinal axis (A1) and transverse to the first plane (P1). The second plane (P2) has an upper side (SU) defining the upward direction (DU) of the tool coupler (20) and a lower side (SL) opposite to the upper side (SU), and defines the downward direction (DD) of the tool coupler (20). The front engaging portion (42) of the fastener has a first engaging region (62) and a second engaging region (64) of the fastener. The male fastening portion (30) has a first abutting region (46) located axially rearward of the first plane (P1). The inner cavity (38) has a second abutting region (48) located axially forward of the first plane (P1). The second abutting region (48) is located on the upper side (SU) of the second plane (P2). Each of the first abutting region (46) and the second abutting region (48) faces the first plane (P1). In the fastened state of the tool coupler (20), the first engaging region (62) of the fastener is in fastening contact with the first abutting region (46) of the male fastening portion. The tool coupler (20) according to claim 25, wherein the second engaging region (64) of the fastener is in fastening contact with the second abutting region (48) of the inner cavity.

Images