Stress-reducing torque transmission design for modular drills

Abstract

A cutting insert for a modular rotary cutting tool is disclosed. The cutting insert can comprise a shank, opposing insert centering surfaces, and convex torque transmission insert drive surfaces.

Description

AREA OF REVELATION

[0001] The disclosure relates generally to stress-reducing, torque-transmitting designs for modular drills. BACKGROUND

[0002] Modular turning tools can rotate a cutting insert located in a shank insert seat. The stress exerted on the cutting insert during rotation can damage it. This can necessitate frequent replacement of the cutting insert, which can be costly.

[0003] An improved modular turning tool is needed to reduce one or more problems associated with one or more of the current modular turning tools. SUMMARY

[0004] In one embodiment, a cutting insert for a rotary cutting tool is disclosed. The cutting insert can comprise a shank, a first and a second opposing insert centering surface, and a first and a second convex torque transmission insert drive surface, which are curved about an axis in a generally radial direction.

[0005] In a further embodiment, a modular rotary cutting tool is disclosed. The modular rotary cutting tool can comprise a shank and a cutting insert. The shank can have a plate seat. The plate seat can have a plate seat base and first and second plate seat drive walls extending at non-parallel angles from the plate seat base. The plate seat base and the first and second plate seat drive walls can form the plate seat. The cutting insert can be removably inserted into the plate seat of the shank. The cutting insert can have first and second torque transmission drive surfaces. The first plate seat drive wall can contact the first torque transmission drive surface only over the central 60% of the length of the first torque transmission drive surface.The second plate seat drive wall can only touch the second torque transmission insert drive surface in the middle 60% of the length of the second torque transmission insert drive surface.

[0006] In a further embodiment, a method for operating a modular rotary cutting tool is disclosed. In one step, a shank of the modular rotary cutting tool can be rotated. The shank can have a plate seat. The plate seat can have a plate seat base and first and second plate seat drive walls extending at non-parallel angles from the plate seat base. The plate seat base and the first and second plate seat drive walls can form the plate seat. In a further step, a first torque transmission insert drive surface of a cutting insert, which is removably installed in the plate seat of the shank, can be driven by the first plate seat drive wall. The first plate seat drive wall can contact the first torque transmission insert drive surface only over the central 60% of the length of the first torque transmission insert drive surface.In an additional step, a second torque transmission insert drive surface of a cutting insert, which is removably installed in the insert seat of the shank, can be driven by the second insert seat drive wall. The second insert seat drive wall can only contact the second torque transmission insert drive surface over a central 60% of its length.

[0007] The scope of this disclosure is defined exclusively by the attached claims and is not affected by the statements in this summary. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] The Book of Revelation can be better understood with reference to the following drawings and descriptions. The components in the figures are not necessarily to scale. Rather, the focus is on illustrating the principles of Revelation. Fig. Figure 1 illustrates a perspective side view of an embodiment of a cutting insert for a modular rotary cutting tool; Fig. Figure 2 illustrates a view along line 2-2 of the cutting insert of the embodiment of Fig. 1; Fig. Figure 3 illustrates a top view of the cutting insert of the embodiment of Fig. 1; Fig. Figure 4 illustrates a side view of the cutting insert of the embodiment of Fig. 1; Fig. Figure 5 illustrates another side view of the cutting insert of the embodiment of Fig. 1; Fig. Figure 6 illustrates a side view of the cutting insert of the embodiment of Fig. 1, which further illustrates a radius of a torque transmission insert drive surface of the cutting insert; Fig. Figure 7 illustrates a perspective side view of an embodiment of a shank for a modular rotary cutting tool; Fig. Figure 8 illustrates a side view of the shaft of the embodiment of Fig. 7; Fig. Figure 9 illustrates a top view of the shaft of the embodiment of Fig. 7; Fig. Figure 10 illustrates a perspective side view of an embodiment of a modular rotary cutting tool, with the cutting insert of the embodiment of Fig. 1, which is removable in a plate seat of the shaft of the embodiment of Fig. 7 is installed; Fig. Figure 11 illustrates a perspective top view of the modular rotary cutting tool of the embodiment of Fig. 10; Fig. Figure 12 illustrates a view inside circle 12-12 of the modular rotary cutting tool of embodiment of Fig. 10; Fig. Figure 13 illustrates a top view of the modular rotary cutting tool of the embodiment of Fig. 10; Fig. Figure 14 illustrates a side view of the modular rotary cutting tool of the embodiment of Fig. 10; Fig. Figure 15 illustrates another side view of the modular rotary cutting tool of the embodiment of Fig. 10; Fig. 16 is a diagram showing the variance of the stress on the modular rotary cutting tool of the embodiment of Fig. 10 illustrated for different constructions; Fig. Figure 17 is another diagram showing the variance of the stress on the modular rotary cutting tool of the embodiment of Fig. 10 additional different constructions illustrated; and Fig. Figure 18 illustrates an embodiment of a method for operating a modular rotary cutting tool. DETAILED DESCRIPTION

[0009] As in the Fig. As shown in Figures 1-6, in one embodiment a cutting insert 10 for a modular rotary cutting tool can be disclosed. The cutting insert 10 can be made of carbide. In other embodiments, the cutting insert 10 can be made of different materials. The cutting insert 10 can comprise a shank 12, a lower section 14, outer surfaces 16 and 18, torque transmission insert drive surfaces 20 and 22, opposing insert centering surfaces 24 and 26, undercut surfaces 28 and 30, chip flutes 32 and 34, and an upper section 36. The shank 12 can extend downwards from the lower section 14.Outer surface 16, clamping groove 32, opposite insert centering surface 24, lower surface 28, torque transmission insert drive surface 22, outer surface 18, clamping groove 34, opposite insert centering surface 26, undercut surface 30 and torque transmission insert drive surface 20 can each be arranged between and adjacent to the lower section 14 and the upper section 36.

[0010] The outer surface 16 can be arranged between and adjacent to the torque transmission insert drive surface 20 and the clamping groove 32. The clamping groove 32 can be arranged between and adjacent to the outer surface 16 and the opposite insert centering surface 24. The opposite insert centering surface 24 can be arranged between and adjacent to the clamping groove 32 and the undercut surface 28. The undercut surface 28 can be arranged between and adjacent to the opposite insert centering surface 24 and the torque transmission insert drive surface 22. The torque transmission insert drive surface 22 can be arranged between and adjacent to the undercut surface 28 and the outer surface 18. The outer surface 18 can be arranged between and adjacent to the torque transmission insert drive surface 22 and the clamping groove 34. The clamping groove 34 can be arranged between and adjacent to the outer surface 18 and the opposite insert centering surface 26.The opposing insert centering surface 26 can be arranged between and adjacent to the clamping groove 34 and the undercut surface 30. The undercut surface 30 can be arranged between and adjacent to the opposing insert centering surface 26 and the torque transmission insert drive surface 20. The torque transmission insert drive surface 20 can be arranged between and adjacent to the undercut surface 30 and the outer surface 16.

[0011] Torque transmission surfaces 20 and 22 can be arranged on opposite sides 38 and 40 of the cutting insert 10. The cutting insert 10 can have a nominal bore diameter D. The torque transmission surfaces 20 and 22 can be curved about an axis 41 in a generally radial direction. The torque transmission surfaces 20 and 22 can be convex along a longitudinal direction 42. A radius R of the convex torque transmission drive surfaces 20 and 22 can be in a range from one hundred (100) millimeters to five hundred (500) millimeters. Outer surfaces 16 and 18 can be convex along the lateral direction 46. Chip flutes 32 and 34 can be concave along the lateral direction 46. Opposing insert centering surfaces 24 and 26 can be flat. Undercut surfaces 28 and 30 can be concave along the lateral direction 46. The upper section 36 may include an angled cutting surface.

[0012] In other embodiments, the cutting insert 10 can have different designs and be made of different materials. For example, the shank 12, the lower section 14, the outer surfaces 16 and 18, the torque transmission insert drive surfaces 20 and 22, the opposing insert centering surfaces 24 and 26, the undercut surfaces 28 and 30, the clamping grooves 32 and 34, and the upper section 36 can have different shapes, sizes, orientations, and configurations. In still other embodiments, the cutting insert 10 may not include one or more of the above-mentioned elements or may include one or more additional surfaces.

[0013] As in the Fig. As shown in Figures 7-9, in one embodiment a shank 48 for a modular rotary cutting tool can be disclosed. The shank 48 can be made of steel. In other embodiments, the shank 48 can be made of different materials. The shank 48 can have a plate seat 50, outer walls 52 and 54, inner walls 56, 58, 60 and 62, upper walls 64 and 66, shank clamping grooves 68 and 70, and coolant channels 72 and 74. The plate seat 50 can have a plate seat base 76, a bore 77, plate seat drive walls 78 and 80, and opposing centering walls 82 and 84. The plate seat drive walls 78 and 80 and the opposing centering walls 82 and 84 can extend at non-parallel angles from the plate seat base 76. The bore 77 can be arranged in the plate seat base 76.The seat base 76, the seat drive walls 78 and 80, the opposing centering walls 82 and 84, the inner walls 56, 58, 60 and 62, and the upper walls 64 and 66 can be flat. The outer walls 52 and 54 can be convex.

[0014] The outer wall 52 can be arranged between and adjacent to the inner wall 56 and the plate seat drive wall 78. The plate seat drive wall 78 can be arranged between and adjacent to the outer wall 52 and the opposite centering wall 82. The opposite centering wall 82 can be arranged between and adjacent to the plate seat drive wall 78 and the inner wall 58. The inner wall 58 can be arranged between and adjacent to the opposite centering wall 82 and the inner wall 56. The inner wall 56 can be arranged between and adjacent to the inner wall 58 and the outer wall 52. The coolant channel 72 can be arranged in the upper wall 64. The upper wall 64 can be arranged at non-parallel angles to and on the upper surface of the outer surface 52, the plate seat drive wall 78, the opposite centering wall 82, and the inner walls 56 and 58.

[0015] The outer wall 54 can be arranged between and adjacent to the inner wall 62 and the plate seat drive wall 80. The plate seat drive wall 80 can be arranged between and adjacent to the outer wall 54 and the opposite centering wall 84. The opposite centering wall 84 can be arranged between and adjacent to the plate seat drive wall 80 and the inner wall 60. The inner wall 60 can be arranged between and adjacent to the opposite centering wall 84 and the inner wall 62. The inner wall 62 can be arranged between and adjacent to the inner wall 60 and the outer wall 54. The coolant channel 74 can be arranged in the upper wall 66. The shaft clamping grooves 68 and 70 can be arranged on opposite sides 86 and 88 of the plate seat 50, adjacent to the plate seat base 76.The upper wall 66 can be arranged at non-parallel angles to and on the top of the outer surface 54, the plate seat drive wall 80, the opposite centering wall 84 and the inner walls 60 and 62.

[0016] In other embodiments, the shaft 48 can have different designs and be made of different materials. For example, the plate seat 50, the outer walls 52 and 54, the inner walls 56, 58, 60 and 62, the upper walls 64 and 66, the shaft clamping grooves 68 and 70, and the coolant channels 72 and 74 can have different shapes, sizes, orientations, and configurations. In still other embodiments, the shaft 48 may not include one or more of the above-mentioned elements or may include one or more additional surfaces.

[0017] As in the Fig. As shown in Figures 10-15, in one embodiment a modular rotary cutting tool 90 can be used with the cutting insert 10 of the embodiment of the Fig. 1-7 comprise, which is removable in the plate seat 50 of the shaft 48 of the embodiment of the Fig. 7-9 is installed with an interference fit. The shank 12 of the cutting insert 10 can be removably fastened in the bore 77 of the plate seat base 76. The lower section 14 of the cutting insert 10 can be arranged against the plate seat base 76 of the plate seat 50 of the shank 48. The opposite insert centering surface 26 of the cutting insert 10 can be arranged on the opposite centering wall 82 of the shank 48. The opposite insert centering wall 82 can be flat. The opposite insert centering surface 24 of the cutting insert 10 can be arranged on the opposite centering wall 84 of the shank 48. The opposite insert centering wall 84 can be flat.

[0018] The torque transmission drive surface 20 of the cutting insert 10 can be arranged on the plate seat drive wall 78 of the shank 48. The torque transmission drive surface 20 of the cutting insert 10 can be convex, and the plate seat drive wall 78 of the shank 48 can be flat or have a radius significantly larger than that of the torque transmission drive surface 20 of the cutting insert 10. The nominal bore diameter D of the cutting insert 10 can be in a range of ten (10) millimeters to forty (40) millimeters. The torque transmission drive surface 20 of the cutting insert 10 can have a radius R in a range of one hundred (100) millimeters to five hundred (500) millimeters.The plate seat drive wall 78 of the shaft 48 can contact the torque transmission insert drive surface 20 only at a height H of the torque transmission insert drive surface 20 in a range of three (3.00) millimeters to ten (10.00) millimeters. In another embodiment, the plate seat drive wall 78 of the shaft 48 can contact the torque transmission insert drive surface 20 at any point in the central 60% of the length L of the torque transmission insert drive surface 20. The plate seat drive wall 78 of the shaft 48 can contact the torque transmission insert drive surface 20 anywhere along the central 60% of the length L of the torque transmission insert drive surface 20. The ratio of the height H of the torque transmission insert drive surface 20 of the cutting insert 10 to the nominal bore diameter D of the cutting insert 10 (H / D) can be in a range of 0.075 to 1.0 and have a preferred range of 0.18 to 0.32.The ratio of the radius R of the torque transmission insert drive surface 20 of the cutting insert 10 to the nominal bore diameter D of the cutting insert 10 (R / D) can be in a range of 2.5 to 50, with a preferred range of 6 to 20. The chip groove 34 of the cutting insert 10 can be aligned with and adjacent to the shank chip groove 68 of the shank 48.

[0019] The torque transmission drive surface 22 of the cutting insert 10 can be arranged on the plate seat drive wall 80 of the shank 48. The torque transmission drive surface 22 can be convex, and the plate seat drive wall 80 of the shank 48 can be flat or have a radius significantly larger than that of the torque transmission drive surface 22 of the cutting insert 10. The torque transmission drive surface 22 of the cutting insert 10 can have a radius R in a range of one hundred (100) millimeters to five hundred (500) millimeters. The plate seat drive wall 80 of the shank 48 can contact the torque transmission drive surface 22 only at a height H of the torque transmission drive surface 22 in the range of three (3.00) millimeters to ten (10.00) millimeters.In another embodiment, the plate seat drive wall 80 of the shank 48 can contact the torque transmission insert drive surface 22 at any point in the middle 60% of the length L of the torque transmission insert drive surface 22. The plate seat drive wall 80 of the shank 48 can contact the torque transmission insert drive surface 22 anywhere along the middle 60% of the length L of the torque transmission insert drive surface 22. The ratio of the height H of the torque transmission insert drive surface 22 of the cutting insert 10 to the nominal bore diameter D of the cutting insert 10 (H / D) can be in a range of 0.075 to 1.0, with a preferred range of 0.18 to 0.32. A ratio of the radius R of the torque transmission insert drive surface 22 of the cutting insert 10 to the nominal bore diameter D of the cutting insert 10 (R / D) can be in a range of 2.5 to 50 and have a preferred range of 6 to 20.The flute 32 of the cutting insert 10 can be aligned with and adjacent to the shank flute 70 of the shank 48.

[0020] In other embodiments, the cutting insert 10 of the modular rotary cutting tool 90 can have different designs and be made of different materials. For example, the shank 12, the lower section 14, the outer surfaces 16 and 18, the torque transmission insert drive surfaces 20 and 22, the opposing insert centering surfaces 24 and 26, the undercut surfaces 28 and 30, the chip flutes 32 and 34, and the upper section 36 can have different shapes, sizes, orientations, and configurations. In still other embodiments, the cutting insert 10 of the modular rotary cutting tool 90 may not include one or more of the above-mentioned elements or may include one or more additional surfaces.

[0021] In other embodiments, the shank 48 of the modular turning tool 90 can have different designs and be made of different materials. For example, the insert seat 50, the outer walls 52 and 54, the inner walls 56, 58, 60 and 62, the upper walls 64 and 66, the shank flutes 68 and 70, and the coolant channels 72 and 74 can have different shapes, sizes, orientations, and configurations. In still other embodiments, the shank 48 of the modular turning tool 90 may not include one or more of the above-mentioned elements or may include one or more additional surfaces.

[0022] The diagram in Fig. Figure 16 illustrates the variance of the tension on the shank 48 and the cutting insert 10 of the modular rotary cutting tool 90. Fig. 10-15, when the radius R of the convex torque transmission insert drive surfaces 20 and 22 is between one hundred and fifty (150) millimeters and three hundred (300) millimeters, while the height H at which the respective plate seat drive walls 78 and 80 of the shaft 48 contact the torque transmission insert drive surfaces 20 and 22 remains constant at four (4) millimeters. For comparison, the diagram also shows a 'flat' embodiment in which the height H is zero (0), in which the respective plate seat drive walls 78 and 80 of the shaft 48 contact the torque transmission insert drive surfaces 20 and 22 because the torque transmission insert drive surfaces 20 and 22 are flat with a radius R of zero (0).The diagram illustrates that increasing the radius R of the convex torque transmission insert drive surfaces 20 and 22, while maintaining the height H at which the respective plate seat drive walls 78 and 80 of the shaft 48 contact the torque transmission insert drive surfaces 20 and 22, can increase the stress on the shaft 48 compared to the stress on the shaft 48 when flat torque transmission insert drive surfaces 20 and 22 are used. The diagram further illustrates that increasing the radius R of the convex torque transmission insert drive surfaces 20 and 22, while maintaining the height H at which the respective plate seat drive walls 78 and 80 of the shaft 48 contact the torque transmission insert drive surfaces 20 and 22, can decrease the stress on the cutting insert 10 compared to the stress on the cutting insert 10 when using flat torque transmission insert drive surfaces 20 and 22.The shank 48 handles tension more effectively than the cutting insert 10. This design change can improve the longevity and durability of the cutting insert 10, which in turn can lead to less frequent replacement of the cutting insert 10. This design change can result in significant cost savings.

[0023] The diagram in Fig. Figure 17 illustrates the variance of the tension on the shank 48 and the cutting insert 10 of the modular rotary cutting tool 90. Fig. 10-15, when the height H at which the respective plate seat drive walls 78 and 80 of the shaft 48 contact the torque transmission insert drive surfaces 20 and 22 is between three and three-quarters (3.75) millimeters and four and a quarter (4.25) millimeters, while the radius R of the convex torque transmission insert drive surfaces 20 and 22 remains constant at three hundred (300) millimeters. For comparison, the diagram also shows a "flat" embodiment in which the height H at which the respective plate seat drive walls 78 and 80 of the shaft 48 contact the torque transmission insert drive surfaces 20 and 22 is zero due to the flat torque transmission insert drive surfaces 20 and 22 with a radius R of zero (0).The diagram illustrates that increasing the height H at which the respective plate seat drive walls 78 and 80 of the shaft 48 contact the torque transmission insert drive surfaces 20 and 22, while keeping the radius R constant, can increase the stress on the shaft 48 while decreasing the stress on the cutting insert 10. The shaft 48 can handle the stress more effectively than the cutting insert 10. Therefore, this design modification can improve the durability and longevity of the cutting insert 10, which in turn can lead to less frequent replacement of the cutting insert 10. This design modification can result in significant cost savings.

[0024] Fig. Figure 18 illustrates an embodiment of a method 100 for operating a modular rotary cutting tool. The method 100 can be used with any of the embodiments of the cutting insert 10, the shank 48, and the modular rotary cutting tool 90 of the Fig. Use 1-15. In other embodiments, the method can use 100 different cutting inserts, shanks, and modular rotary cutting tool configurations.

[0025] Step 102 may involve turning a shank of the modular turning tool. The shank may include a die seat. The die seat may include a die seat base and first and second die seat drive walls extending from the die seat base at non-parallel angles. The die seat base and the first and second die seat drive walls may form the die seat.

[0026] Step 104 may involve driving a first torque transmission insert drive surface of a cutting insert, which is removably installed in the insert seat of the shank, with the first insert seat drive wall. The first insert seat drive wall may contact the first torque transmission insert drive surface only in the middle 60% of the length of the first torque transmission insert drive surface. The first insert seat drive wall may contact the first torque transmission insert drive surface anywhere along the middle 60% of the length of the first torque transmission insert drive surface.

[0027] Step 106 may involve driving a second torque transmission insert drive surface of a cutting insert, which is removably installed in the insert seat of the shank, with the second insert seat drive wall. The second insert seat drive wall may contact the second torque transmission insert drive surface only in the central 60% of the length of the second torque transmission insert drive surface. The second insert seat drive wall may contact the second torque transmission insert drive surface anywhere along the central 60% of the length of the second torque transmission insert drive surface.

[0028] In one embodiment of method 100 of Fig. 18. The first plate seat drive wall of the shaft may only contact the first torque transmission insert drive surface at a height of the first torque transmission insert drive surface within a range of three (3.00) millimeters to ten (10.00) millimeters. Similarly, the second plate seat drive wall of the shaft may only contact the second torque transmission insert drive surface at a height of the second torque transmission insert drive surface within a range of three (3.00) millimeters to ten (10.00) millimeters.

[0029] In another embodiment of method 100 of Fig. 18 The first and second torque transmission drive surface can be convex.

[0030] In yet another embodiment of method 100 of Fig. 18 The first and second torque transmission drive surface can each have a radius in a range from one hundred (100) millimeters to five hundred (500) millimeters.

[0031] In a further embodiment of method 100 of Fig. 18. The shank may further comprise first and second opposing centering walls, and the cutting insert may further comprise first and second opposing insert centering surfaces. The first opposing centering wall of the shank may be arranged on the first opposing insert centering surface of the cutting insert, and the second opposing centering wall of the shank may be arranged on the second opposing insert centering surface of the cutting insert.

[0032] In a further embodiment of method 100 of Fig. 18. The cutting insert may further comprise a first and a second undercut surface. The first undercut surface may be arranged between the first torque transmission insert drive surface and the first opposing insert centering surface. The second undercut surface may be arranged between the second torque transmission insert drive surface and the second opposing insert centering surface.

[0033] In yet another embodiment of method 100 of Fig. 18. The cutting insert may further comprise first and second clamping grooves. The first clamping groove may be arranged adjacent to the first opposite insert centering surface, and the second clamping groove may be arranged adjacent to the second opposite insert centering surface. The shank may further comprise a first and a second shank clamping groove. The first clamping groove of the cutting insert may be aligned with the first shank clamping groove of the shank, and the second clamping groove of the cutting insert may be aligned with the second shank clamping groove of the shank.

[0034] In a further embodiment of method 100 of Fig. 18. The cutting insert can further comprise a first and a second outer surface. The first outer surface can be arranged adjacent to the second chip groove. The first outer surface can also be arranged adjacent to the first torque transmission insert drive surface. The second outer surface can be arranged adjacent to the first chip groove. The second outer surface can also be arranged adjacent to the second torque transmission insert drive surface.

[0035] In a further embodiment of method 100 of Fig. 18. The cutting insert may further comprise first and second undercut surfaces. The first undercut surface may be arranged between the first torque transmission insert drive surface and the first opposing insert centering surface. The second undercut surface may be arranged between the second torque transmission insert drive surface and the second opposing insert centering surface.

[0036] In other embodiments, one or more steps of method 100 of Fig. 18. The content or order of the process may vary; one or more steps of the process 100 may be omitted, or one or more additional steps may be added. In yet other embodiments, the process 100 may be Fig. 18 more variations.

[0037] One or more embodiments of the disclosure can reduce one or more of the problems associated with one or more of the existing modular rotary cutting tools. For example, the use of one or more of the embodiments of the modular rotary cutting tools disclosed herein can result in a lower stress on the cutting insert of the modular rotary cutting tool. This can lead to the cutting insert needing to be replaced less frequently, which can save considerable costs.

[0038] The summary is intended to enable the reader to quickly grasp the nature of the technical disclosure. It is presented with the understanding that it is not to be used for the interpretation or limitation of the scope or meaning of the claims. Furthermore, it is evident from the preceding detailed description that various features in different embodiments have been grouped together for the sake of simplicity. This method of disclosure is not to be interpreted as meaning that the claimed embodiments require more features than are expressly listed in the individual claims. Rather, as the following claims demonstrate, the subject matter of the invention lies in fewer than all the features of a single disclosed embodiment. Therefore, the following claims are included in the detailed description, each claim constituting a separate claimed subject matter.

[0039] While certain aspects of the subject matter described herein have been presented and described, it will be obvious to the person skilled in the art that changes and modifications can be made based on the teachings contained herein without departing from the subject matter described herein and its broader aspects. Therefore, the scope of the attached claims is intended to encompass all such changes and modifications that fall within the true scope of the subject matter described herein. Furthermore, it is understood that the disclosure is defined by the attached claims. Accordingly, the disclosure is not to be limited except with regard to the attached claims and their equivalents.

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