Tool holder

Abstract

A tool holder is provided. The tool has a holder sleeve having a longitudinal outer protrusion to engage with an inner recessed radial groove of a tool holder, and wherein the holder sleeve has one or more inner radial protrusions to engage with a recessed groove in a rotary tool handle. A cutting tool assembly is provided that includes a cutting bit and a holder sleeve.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This utility patent application claims the benefit of priority to U.S. patent application serial number 17 / 816,193, filed on July 29, 2022, which is a continuation-in-part patent application of U.S. patent application serial number 17 / 447,346, filed on September 10, 2021. The entire contents of U.S. patent application serial number 17 / 816,193 and U.S. patent application serial number 17 / 447,346 are incorporated by reference into this utility patent application as if fully rewritten herein.

[0003] STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT

[0004] not applicable. Technical Field

[0005] The present invention relates to a cutting tool assembly for earthmoving, mining or construction applications, and more particularly to a tool having a retainer sleeve having a longitudinal external protrusion to engage with an internal recessed groove of a cylindrical bore of a cutting drill bit holder, and wherein the retainer sleeve has one or more internal radial protrusions, and in some embodiments has four internal radial protrusions, wherein each of these internal radial protrusions has a convex portion that engages a recessed groove in a rotating tool shank. Background Art

[0006] It is necessary to prevent the tool from coming out of the holder during operation. This may occur due to the tool coming out of the holder (leaving the holder in the holder) or the holder coming out of the holder together with the tool. If the force to install the tool with the holder is too great, it is difficult to easily install the tool in the field. The currently known holders allow too much axial movement of the tool during use, which allows the tool to come out of the holder, causing the tool to bend or break. The currently known holder design contacts the shank of the rotating tool at the top of the holder, causing the top of the holder to wear and become thinner. All these problems of the known holders may not prevent the tool from coming out of the holder during operation.

[0007] Background technology discloses the following technologies, such as a rotary conical drill bit retained by a captive retaining ring, a pick-up mining tool with a hard wear-resistant bushing in a retainer, a pick-up mining drill bit with a cylindrical shank, the pick-up mining drill bit having a support block with a hole and a hard insert detachably and rotatably mounted in the hole. In addition, the background technology discloses an elastic retaining device for connecting a working tool and a working retainer and an annular member placed between the working tool and the working tool retainer. Other background technologies disclose a retaining spring for connecting a mining tool to a working retainer, or a retainer sleeve for a rotary drill bit, the retainer sleeve comprising a longitudinally split cylindrical portion and at least four circumferentially spaced protrusions deformed radially inwardly from the longitudinally split cylindrical portion. The background technology also discloses a round shank tool, which includes a shank retained in a hole in a tool holder by a locking sleeve. The locking sleeve has one or more retaining elements, which protrude inwardly and engage in a peripheral groove in the shank of the tool.

[0008] The present invention solves the above-mentioned disadvantages of the background art by comprising a longitudinal protrusion for engaging in a groove in a holder and four inner radial protrusions each having a male portion that engages a groove in a rotary tool shank. Summary of the invention

[0009] A tool holder is provided.

[0010] In one embodiment of the present invention, a retainer sleeve includes a longitudinal external protrusion to engage with an internal recessed groove of a cylindrical bore of a cutting drill bit holder, and wherein the retainer sleeve has at least one or more internal radial protrusions, and in some embodiments has four internal radial protrusions, which engage the recessed groove in the shank of a rotary tool.

[0011] In another embodiment of the present invention, a tool is provided, which has a retainer sleeve having a longitudinal external protrusion to engage with an internal recessed radial groove of a tool holder, and wherein the retainer sleeve has four internal radial protrusions that engage with the recessed grooves in the shank of a rotating tool.

[0012] Another embodiment of the present invention provides a cutting tool assembly, the cutting tool assembly comprising: a cutting drill bit having a cutting element and a cylindrical shank; a cutting drill bit holder having an inner cylindrical hole, the inner cylindrical hole having an inner concave radial groove; an optional gasket, the gasket is located between the cutting drill bit and the cutting drill bit holder; and a cylindrical retainer sleeve, wherein the cylindrical retainer sleeve has a longitudinal outer protrusion located on the outer wall of the cylindrical retainer sleeve, each having a convex portion and a radially outwardly protruding longitudinal outer protrusion. or more internal radial protrusions, and wherein the cylindrical retainer sleeve fits within the internal cylindrical bore of the cutting drill bit holder, and wherein the cylindrical shank fits within the cylindrical retainer sleeve, and wherein the outwardly protruding longitudinal external protrusions of the cylindrical retainer sleeve fit into the internal concave radial grooves of the internal cylindrical bore of the cutting drill bit holder, and wherein the convex portion of each of the internal radial protrusions is biased against and fits into the concave grooves located on the outer wall of the cylindrical shank. In another embodiment of the cutting tool assembly of the present invention, the outer wall of the cylindrical retainer sleeve has a split, which forms an opening on the cylindrical retainer sleeve. The cylindrical retainer sleeve is made of a compressible material. In certain embodiments of the present invention, a cutting tool assembly is provided, wherein the retainer sleeve has: a first inner radial protrusion having a first convex portion, a second inner radial protrusion having a second convex portion, a third inner radial protrusion having a third convex portion, and a fourth inner radial protrusion having a fourth convex portion, and wherein the first convex portion of the first inner radial protrusion, the second convex portion of the second inner radial protrusion, the third convex portion of the third inner radial protrusion, and the fourth convex portion of the fourth inner radial protrusion are biased against a recessed groove located on the outer wall of the cylindrical shank and fit into the recessed groove.

[0013] Another embodiment of the cutting tool assembly of the present invention provides a cutting drill bit, which has a head, the head including a body longitudinally located below the cutting element, and a shoulder located below the body, and a cylindrical shank, the cylindrical shank having an outer wall, the outer wall having a longitudinal length extending from below the shoulder in the longitudinal direction, and a recessed groove located on the outer wall of the cylindrical shank; a cutting drill bit holder, the cutting drill bit holder having an inner cylindrical hole and a front face, and wherein the inner cylindrical hole has a mouth, and wherein the inner cylindrical hole has a longitudinal length, the longitudinal length extending in the longitudinal direction of the cylindrical shank, and wherein the inner cylindrical hole has an inner recessed radial groove; a washer, the washer having a center hole, and wherein the washer is located between the shoulder of the cutting drill bit and the front face of the cutting drill bit holder; and a cylindrical retainer sleeve having an outer wall, the cylindrical retainer sleeve having a longitudinal length, and a split located on the circumference of the outer wall, the split forming a groove on the cylindrical retainer sleeve. into an opening, and wherein the slit extends in the longitudinal direction along the longitudinal length of the cylindrical retainer sleeve, and wherein the cylindrical retainer sleeve has a longitudinal outer protrusion protruding radially outward on the outer wall, a first inner radial protrusion having a first convex portion, a second inner radial protrusion having a second convex portion, a third inner radial protrusion having a third convex portion, and a fourth inner radial protrusion having a fourth convex portion, and wherein the cylindrical retainer sleeve fits within the inner cylindrical hole of the cutting drill bit holder, and wherein the cylindrical shank fits within the cylindrical retainer sleeve, and wherein the longitudinal outer protrusion protruding outward fits into an inner concave radial groove of the inner cylindrical hole of the cutting drill bit holder, and wherein the first convex portion of the first inner radial protrusion, the second convex portion of the second inner radial protrusion, the third convex portion of the third inner radial protrusion, and the fourth convex portion of the fourth inner radial protrusion are biased against and fit into a concave groove located on the outer wall of the cylindrical shank.

[0014] In another embodiment of this cutting tool assembly, the retainer sleeve has a first internal radial protrusion which is positioned to be juxtaposed with and communicated with a second internal radial protrusion, wherein the second internal radial protrusion is positioned to be juxtaposed with and communicated with a third internal radial protrusion, and wherein the third internal radial protrusion is positioned to be juxtaposed with and communicated with a fourth internal radial protrusion.

[0015] The opening of the split of the cylindrical retainer sleeve is positioned opposite to the outwardly protruding longitudinal external protrusion of the cylindrical retainer sleeve, and wherein the opening of the split of the cylindrical retainer sleeve is located between the first inner radial protrusion and the fourth inner radial protrusion. The outwardly protruding longitudinal external protrusion of the cylindrical retainer sleeve fits into the inner concave radial groove of the inner cylindrical hole of the cutting drill holder to prevent the axial movement of the cylindrical retainer sleeve in the inner cylindrical hole of the cutting drill holder. The first convex portion of the first inner radial protrusion, the second convex portion of the second inner radial protrusion, the third convex portion of the third inner radial protrusion, and the fourth convex portion of the fourth inner radial protrusion are biased against the concave groove located on the outer wall of the cylindrical shank and fit into the concave groove to prevent the axial movement of the cutting drill. The cylindrical shank has a circumference smaller than the circumference of the shoulder. The inner cylindrical hole of the cutting drill holder has a circumference larger than the circumference of the cylindrical shank. The washer has a center hole circumference that is larger than the circumference of the cylindrical shank and has a center hole circumference that is smaller than the circumference of the shoulder. The outer wall of the cylindrical retainer sleeve has a circumference that is smaller than the circumference of the inner cylindrical hole of the cutting drill holder. The cylindrical retainer sleeve is made of a compressible material. The compressible material is, for example, but not limited to, one of 1070 or 65 Mn spring steel. In some embodiments, in an uncompressed state (i.e., a free state, see Figure 5 ), the width of the opening of the slit is about 8 mm, and wherein the slit is compressed to a width from less than about 8 mm to greater than about 1 mm (i.e., compressed state, see Figure 7 ).

[0016] These and other embodiments of the invention will be described in more detail herein and in the accompanying drawings that show certain embodiments of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Although various embodiments of the present invention are shown in the drawings, the specific embodiments shown should not be construed as limiting the claims. Various modifications and changes may be made without departing from the scope of the present invention.

[0018] Figure 1 A side cross-sectional view of the holder sleeve of the present invention is shown with the cylindrical shank of the cutting bit within the cylindrical holder sleeve.

[0019] Figure 2 A side view of the retainer sleeve of the present invention is shown with the longitudinal outer projection of the cylindrical retainer sleeve engaging the mouth of the inner cylindrical bore of the cutting bit holder.

[0020] Figure 3A side cross-sectional view of the retainer sleeve of the present invention is shown with the longitudinal outer projection of the cylindrical retainer sleeve engaging the inner concave radial groove of the cutting bit holder.

[0021] Figure 4 A bottom cross-sectional view of the retainer sleeve of the present invention is shown installed into a cutting bit holder.

[0022] Figure 5 A top cross-sectional view of a cylindrical retainer sleeve of the present invention is shown in its uncompressed form (ie, free state).

[0023] Figure 6 A cross-sectional view of the retainer sleeve is shown, illustrating the longitudinal outer projections.

[0024] Figure 7 A top view of a cylindrical retainer sleeve of the present invention is shown in a compressed form (compressed state).

[0025] Figure 8 A top cross-sectional view of a cylindrical retainer sleeve of the present invention is shown in its uncompressed form (ie, free state), depicting the angle of the inner radial projection of the retainer sleeve. DETAILED DESCRIPTION

[0026] Figure 1-8 A retainer sleeve (32) according to an embodiment of the present invention is shown, the retainer sleeve including a longitudinal external protrusion (34) to engage with an internal recessed groove (25) of a cylindrical bore (20) of a cutting drill bit holder (18), and wherein the retainer sleeve (32) has one or more internal radial protrusions, and in some embodiments has four internal radial protrusions, namely, a first internal radial protrusion (40) having a first convex portion (50), a second internal radial protrusion (41) having a second convex portion (51), a third internal radial protrusion (42) having a third convex portion (52), and a fourth internal radial protrusion (43) having a fourth convex portion (53), the internal radial protrusions engaging the recessed groove (36) in the shank (16) of a rotary tool.

[0027] There has been a need to design a holder sleeve (32) having at least one longitudinal external protrusion (34) which allows the tool to be mounted in a cutting bit holder (18) having an internal concave recess (25) of the cylindrical bore (20) of said cutting bit holder (18) and at the same time the spring pressure of the expanded holder sleeve (32) is applied to the internal cylindrical bore (20) of the cutting bit holder (18). In addition, the holder sleeve (32) should be retained on the tool by at least one internal radial protrusion (40, 41, 42 or 43) having two parallel flat surfaces perpendicular to the tool axis, respectively. In certain embodiments of the present invention, after assembly, the first convex portion (50) of the first inner radial protrusion (40), the second convex portion (51) of the second inner radial protrusion (41), the third convex portion (52) of the third inner radial protrusion (42), and the fourth convex portion (53) of the fourth inner radial protrusion (43) engage the recessed groove (36) on the shank (16) of the rotary tool to prevent the tool from being pulled out of the retainer during operation.

[0028] The longitudinal outer protrusion (34) is designed to collapse the retainer sleeve (32) when the retainer sleeve is installed to reduce friction between the retainer sleeve (32) and the hole (20) of the cutting drill holder (18). The longitudinal outer protrusion (34) is also angled to be introduced into the hole (20) to make it easier to install the tool, such as Figure 6. Angle α can be in the range of 10°-40°, or between 20°-30°. The angled design of the longitudinal external protrusion (34) also helps to make it easier to assemble a gasket (70) as an optional element onto the retainer sleeve (32) over the longitudinal external protrusion (34) during manufacturing. At least one longitudinal external protrusion (34) is required to engage the internal recessed radial groove (25) of the hole (20). The internal radial protrusions (40, 41, 42 and 43) limit axial movement of the tool, which helps prevent the tool from coming out of the retainer and bending / breaking. At least one internal radial protrusion (40, 41, 42 or 43) is required to allow space for the longitudinal external protrusion (34) and the longitudinal split (60), which allows the retainer sleeve (32) to collapse (compress) during installation. The first, second, third and fourth inner radial protrusions (40, 41, 42 and 43) respectively limit the axial movement of the tool so that the top of the retainer sleeve (32) does not contact the hub (73) at the upper portion of the shank (16) of the rotating tool. The first, second, third and fourth inner radial protrusions (40, 41, 42 and 43) of the retainer sleeve (32) will respectively contact both sides of the recessed groove (36) of the shank (16) of the tool. During installation, the top of the recessed groove (36) will respectively contact the top of the first, second, third and fourth inner radial protrusions (40, 41, 42 and 43), and during removal, the bottom of the recessed groove (36) will respectively contact the bottom of the first, second, third and fourth inner radial protrusions (40, 41, 42 and 43). Before the top of the retainer sleeve (32) contacts the hub (73) at the upper portion of the shank (16), the concave groove (36) of the shank (16) will contact the first, second, third and fourth convex portions (50, 51, 52 and 53) of the first, second, third and fourth inner radial protrusions (40, 41, 42 and 43) of the retainer sleeve (32), respectively.

[0029] refer to Figure 1-8 In an embodiment of the present invention, a tool (10) is provided, which includes a retainer sleeve (32), the retainer sleeve having a longitudinal external protrusion (34) to engage an internal recessed radial groove (25) of a tool holder (18), and wherein the retainer sleeve (32) has first, second, third and fourth internal radial protrusions (40, 41, 42 and 43) respectively engaging recessed grooves (36) in a rotating tool shank (16).

[0030] refer to Figure 1-8In another embodiment of the present invention, a cutting tool assembly (10) is provided, comprising: a cutting drill bit (12) having a cutting element (26) and a cylindrical shank (16); a cutting drill bit holder (18) having an inner cylindrical hole (20) having an inner recessed radial groove (25); an optional washer (70) located between the cutting drill bit (12) and the cutting drill bit holder (18); and a cylindrical retainer sleeve (32), wherein the cylindrical retainer sleeve (32) has a longitudinal outer protrusion (34) protruding radially outwardly on an outer wall (33) of the cylindrical retainer sleeve (32), a first inner radial protrusion (40) having a first convex portion (50), a second inner radial protrusion (41) having a second convex portion (51), a third inner radial protrusion (42) having a third convex portion (52), and a fourth inner radial protrusion (43) having a fourth convex portion (53). The invention relates to a fourth inner radial protrusion (43) of the cylindrical retainer sleeve (53), and wherein the cylindrical retainer sleeve (32) fits within the inner cylindrical bore (20) of the cutting drill bit holder (18), and wherein the cylindrical shank (16) fits within the cylindrical retainer sleeve (32), and wherein the outwardly protruding longitudinal outer protrusion (34) of the cylindrical retainer sleeve (32) fits into the inner recessed radial recess of the inner cylindrical bore (20) of the cutting drill bit holder (18). The cutting tool assembly (10) of the present invention is characterized in that the first convex portion (50) of the first inner radial protrusion (40), the second convex portion (51) of the second inner radial protrusion (41), the third convex portion (52) of the third inner radial protrusion (42), and the fourth convex portion (53) of the fourth inner radial protrusion (43) are biased against and fit into the concave groove (36) located on the outer wall (17) of the cylindrical shank (16). In another embodiment of the cutting tool assembly (10) of the present invention, the outer wall (33) of the cylindrical holder sleeve (32) has a split (60) that forms an opening (61) on the cylindrical holder sleeve (32). The cylindrical holder sleeve (32) is made of a compressible material.

[0031] refer to Figure 1-8, another embodiment of a cutting tool assembly (10) is provided, comprising: a cutting drill bit (12), the cutting drill bit having a head (14), the head including a body (24) longitudinally located below a cutting element (26), and a shoulder (28) located below the body (24), and a cylindrical shank (16), the cylindrical shank having an outer wall (17), the outer wall having a longitudinal length extending from below the shoulder (28) in a longitudinal direction, and a recessed groove (36) located on the outer wall (17) of the cylindrical shank (16); a cutting drill bit holder (18), the cutting drill bit holder having an inner cylindrical hole (20) and a front face (22), and wherein the inner cylindrical a cylindrical hole (20) having a mouth (30), and wherein the inner cylindrical hole (20) has a longitudinal length, the longitudinal length extending in the longitudinal direction of the cylindrical shank (16), and wherein the inner cylindrical hole (20) has an inner concave radial groove (25); a washer (70), which is an optional element, having a central hole (72), and wherein the washer is located between the shoulder (28) of the cutting drill bit (12) and the front face (22) of the cutting drill bit holder (18); and a cylindrical retainer sleeve (32) having an outer wall (33), the cylindrical retainer sleeve (32) having a longitudinal length, and a split (60) located on the circumference of the outer wall (33), the split being located at the cylindrical retainer sleeve (32) The split is located at the cylindrical retainer sleeve (3 2) is formed with an opening (61), and wherein the slit (60) extends in the longitudinal direction along the longitudinal length of the cylindrical retainer sleeve (32), and wherein the retainer sleeve (32) has a longitudinal outer protrusion (34) located on the outer wall (33) and protruding radially outward, a first inner radial protrusion (40) having a first convex portion (50), a second inner radial protrusion (41) having a second convex portion (51), a third inner radial protrusion (42) having a third convex portion (52), and a fourth inner radial protrusion (43) having a fourth convex portion (53), and wherein the cylindrical retainer sleeve (32) is fitted into the inner cylindrical hole ( 20), and wherein the cylindrical shank (16) fits within the cylindrical retainer sleeve (32), and wherein the outwardly projecting longitudinal outer protrusion (34) fits into the inner concave radial groove (25) of the inner cylindrical hole (20) of the cutting drill holder (18), and wherein the first convex portion (50) of the first inner radial protrusion (40), the second convex portion (51) of the second inner radial protrusion (41), the third convex portion (52) of the third inner radial protrusion (42), and the fourth convex portion (53) of the fourth inner radial protrusion (43) are biased against and fit into the concave groove (36) located on the outer wall (17) of the cylindrical shank (16).In another embodiment of the cutting tool assembly, the first inner radial protrusion (40) is positioned juxtaposed with and in communication with the second inner radial protrusion (41), and wherein the second inner radial protrusion (41) is positioned juxtaposed with and in communication with the third inner radial protrusion (42), and wherein the third inner radial protrusion (42) is juxtaposed with and in communication with the fourth inner radial protrusion (43). The opening (61) of the split (60) of the cylindrical retainer sleeve (32) is positioned opposite to the outwardly protruding longitudinal outer protrusion (34) of the cylindrical retainer sleeve (32), and wherein the opening (61) of the split (60) of the cylindrical retainer sleeve (32) is located between the first inner radial protrusion (40) and the fourth inner radial protrusion (43). The outwardly projecting longitudinal outer protrusion (34) of the cylindrical retainer sleeve (32) fits into the inner concave radial groove (25) of the inner cylindrical hole (20) of the cutting drill holder (18) to prevent axial movement of the cylindrical retainer sleeve (32) within the inner cylindrical hole (20) of the cutting drill holder (18). The first convex portion (50) of the first inner radial protrusion (40), the second convex portion (51) of the second inner radial protrusion (41), the third convex portion (52) of the third inner radial protrusion (42), and the fourth convex portion (53) of the fourth inner radial protrusion (43) are biased against the concave groove (36) located on the outer wall (17) of the cylindrical shank (16) and fit into the concave groove to prevent axial movement of the cylindrical shank (16). The cylindrical shank (16) has a circumference that is smaller than the circumference of the shoulder (28). The inner cylindrical hole (20) of the cutting drill bit holder (18) has a circumference that is larger than the circumference of the cylindrical shank (16). The washer, which is an optional element, has a center hole (72) circumference that is larger than the circumference of the cylindrical shank (16) and has a center hole (72) circumference that is smaller than the circumference of the shoulder (28). The outer wall (33) of the cylindrical retainer sleeve (32) has a circumference that is smaller than the circumference of the inner cylindrical hole (20) of the cutting drill bit holder (18). The cylindrical retainer sleeve (32) is made of a compressible material. The compressible material is, for example, but not limited to, one of 1070 or 65 Mn spring steel. In some embodiments, in an uncompressed state (i.e., free state,. Figure 5 ), the width of the opening (61) of the slit (60) is about 8 mm, and when the opening (61) of the slit (60) is compressed, the width of the compressed opening (61) is from less than about 8 mm to greater than about 1 mm (i.e., in the compressed state, Figure 7 ).

[0032] refer to Figure 1-8Another embodiment of the present invention provides a cylindrical retainer sleeve (32), comprising: a cylindrical outer wall (33) having a circumference and a longitudinal length, and a split (60) located on the circumference of the outer wall (33), wherein the split forms an opening (61) on the cylindrical retainer sleeve (32), and wherein the split (60) extends in the longitudinal direction along the longitudinal length of the cylindrical retainer sleeve (32), and wherein the cylindrical retainer sleeve (32) has a longitudinal outer protrusion (34) located on the outer wall (33) and protruding radially outward, a first inner radial protrusion (40) having a first convex portion (50), a second inner radial protrusion (41) having a second convex portion (51), a third inner radial protrusion (42) having a third convex portion (52), and a and a fourth inner radial protrusion (43) having a fourth convex portion (53), and wherein the cylindrical retainer sleeve (32) fits within the inner cylindrical hole (20) of the cutting drill bit holder (18), and wherein the cylindrical shank (16) fits within the cylindrical retainer sleeve (32), and wherein the outwardly protruding longitudinal outer protrusion (34) fits into an inner concave radial groove (25) of the inner cylindrical hole (20) of the cutting drill bit holder (18), and wherein the first inner radial protrusion (40), the second inner radial protrusion (41), the third inner radial protrusion (42) and the fourth inner radial protrusion (43) are biased against and fit into a concave groove (36) located on the outer wall (17) of the cylindrical shank (16). The cylindrical retainer sleeve (32) includes an opening (61) of a split (60) of the cylindrical retainer sleeve (32), wherein the opening of the split of the cylindrical retainer sleeve is positioned opposite to the outwardly protruding longitudinal outer protrusion (34) of the cylindrical retainer sleeve (32), and wherein the opening (61) of the split (60) of the cylindrical retainer sleeve (32) is located between the first inner radial protrusion (40) and the fourth inner radial protrusion (43). The cylindrical retainer sleeve (32) is made of a compressible material. The compressible material is, for example, but not limited to, one of 1070 or 65 Mn spring steel. In a particular embodiment of the present invention, in an uncompressed state (i.e., a free state, Figure 5 ), the width of the opening (61) of the slit (60) is about 8 mm, and when the opening (61) of the slit (60) is compressed, the width of the compressed opening (61) is from less than about 8 mm to greater than about 1 mm (i.e., in the compressed state, Figure 7 ).

[0033] Those skilled in the art will appreciate that one or more internal radial protrusions are provided in the present invention, each of which has a convex portion that is biased against and fits into a concave groove located on the outer wall of the cylindrical shank. In certain embodiments, the retainer sleeve has: a first internal radial protrusion having a first convex portion, a second internal radial protrusion having a second convex portion, a third internal radial protrusion having a third convex portion, and a fourth internal radial protrusion having a fourth convex portion, and wherein the first convex portion of the first internal radial protrusion, the second convex portion of the second internal radial protrusion, the third convex portion of the third internal radial protrusion, and the fourth convex portion of the fourth internal radial protrusion are biased against and fit into a concave groove located on the outer wall of the cylindrical shank. Those skilled in the art will appreciate that the number of internal radial protrusions provided will depend on the diameter of the retainer ring, so that a large diameter retainer ring may require, for example but not limited to, one or more internal radial protrusions or more than four internal radial protrusions in order to stabilize the retainer ring.

[0034] Those skilled in the art will appreciate that the cylindrical retainer sleeve of the present invention is non-depression. As used herein, the term "non-depression" means that there are no protruding outwardly directed protrusions or bumps. The cylindrical retainer sleeve of the present invention is compressible so that in the compressed state, the width of the opening of the split is maintained at least one millimeter or more millimeters. Figure 8 A top cross-sectional view of a cylindrical retainer sleeve of the present invention in an uncompressed form (i.e., free state) is shown, wherein an embodiment of the present invention shows that the first convex center portion of the first inner radial protrusion of the cylindrical retainer sleeve is positioned at approximately 58 degrees to approximately 62 degrees relative to the horizontal axis of the cylindrical retainer sleeve B-B', and the second inner radial protrusion of the cylindrical retainer sleeve is positioned at approximately 68 degrees to approximately 72 degrees relative to the first inner radial protrusion of the cylindrical retainer sleeve.

[0035] As used herein, the terms "including", "containing", etc., in the context of this application, shall be understood to be synonymous with "comprising", and are therefore open-ended and do not exclude the presence of additional undescribed or unlisted elements, materials, phases, or method steps. As used herein, "consisting of" in the context of this application shall be understood to exclude the presence of any unspecified elements, materials, phases, or method steps. As used herein, "consisting essentially of" in the context of this application shall be understood to include the specified elements, materials, phases, or method steps (if applicable), and also include any unspecified elements, materials, phases, or method steps that do not materially affect the basic or novel characteristics of the invention.

[0036] For the purpose of the above description, it should be understood that, except where expressly specified to the contrary, the present invention may employ various alternative variations and step sequences. In addition, all numerals expressing the quantity of components used in, for example, the specification and claims should be understood to be modified by the term "about" in all cases. Therefore, unless otherwise indicated, the numerical parameters set forth are approximate values, which may vary depending on the desired properties sought to be obtained by the present invention. At a minimum, and without attempting to limit the application of the doctrine of equivalents, each numerical parameter should be interpreted at least in view of the number of reported significant figures and by applying general rounding techniques.

[0037] It should be understood that any numerical range stated herein is intended to include all sub-ranges contained therein. For example, a range of "1 to 10" is intended to include all sub-ranges between (and including) the stated minimum value of 1 and the stated maximum value of 10, i.e., having a minimum value equal to or greater than 1 and a maximum value equal to or less than 10.

[0038] In this application, unless specifically stated otherwise, the use of the singular includes the plural and the plural includes the singular. In addition, in this application, the use of "or" means "and / or" unless explicitly stated otherwise, even though "and / or" may be explicitly used in certain circumstances. In this application, the articles "a", "an", and "the" include plural referents unless explicitly and obviously limited to one referent.

[0039] While specific embodiments of the present invention have been described above for purposes of illustration, it will be apparent to those skilled in the art that numerous changes in the details of the invention may be made without departing from the invention as defined in the appended claims.

Claims

1. A cutting tool assembly, comprising: a cutting drill bit having a cutting element and a cylindrical shank; 8. The urging means for urging the drill bit to rotate said tool holder forwardly and backwards through the cam face, said cam face being arranged in a line extending along the length of the tool holder's upper edge and extending along the length of the tool holder's lower edge.

2. The cutting tool assembly of claim 1, wherein the outer wall of the cylindrical holder sleeve has a split, the split forming an opening on the cylindrical holder sleeve.

3. The cutting tool assembly of claim 2, wherein the cylindrical retainer sleeve is made of a compressible material.

4. A cutting tool assembly according to claim 1, wherein the retainer sleeve has: a first inner radial protrusion having a first convex portion, a second inner radial protrusion having a second convex portion, a third inner radial protrusion having a third convex portion, and a fourth inner radial protrusion having a fourth convex portion, and wherein the first convex portion of the first inner radial protrusion, the second convex portion of the second inner radial protrusion, the third convex portion of the third inner radial protrusion, and the fourth convex portion of the fourth inner radial protrusion are biased against a recessed groove located on the outer wall of the cylindrical shank and fit into the recessed groove.

5. The cutting tool assembly of claim 1, comprising a washer located between the cutting bit and the cutting bit holder.

6. A cutting tool assembly comprising: A cutting drill bit having: a head including a body located longitudinally below the cutting element and a shoulder located below the body, and a cylindrical shank having an outer wall and a concave groove, the outer wall having a longitudinal length extending in a longitudinal direction below the shoulder, the concave groove being located on the outer wall of the cylindrical shank; a cutting drill bit holder having an inner cylindrical bore and a front face, and wherein the inner cylindrical bore has a mouth, and wherein the inner cylindrical bore has a longitudinal length extending in a longitudinal direction of the cylindrical shank, and wherein the inner cylindrical bore has an inner concave radial groove; a washer having a central hole and wherein the washer is located between the shoulder of the cutting bit and the front face of the cutting bit holder; and A cylindrical retainer sleeve having an outer wall, the cylindrical retainer sleeve having a longitudinal length, and a split located on the circumference of the outer wall, the split forming an opening on the cylindrical retainer sleeve, and wherein the split extends in the longitudinal direction along the longitudinal length of the cylindrical retainer sleeve, and wherein the retainer sleeve has a longitudinal outer protrusion located on the outer wall that protrudes radially outward, a first inner radial protrusion having a first convex portion, a second inner radial protrusion having a second convex portion, a third inner radial protrusion having a third convex portion, and a fourth inner radial protrusion having a fourth convex portion, and wherein the cylindrical retainer The sleeve fits within the inner cylindrical hole of the cutting drill bit holder, and wherein the cylindrical shank fits within the cylindrical retainer sleeve, and wherein the outwardly protruding longitudinal outer protrusion fits into the inner concave groove of the inner cylindrical hole of the cutting drill bit holder, and wherein the first convex portion of the first inner radial protrusion, the second convex portion of the second inner radial protrusion, the third convex portion of the third inner radial protrusion, and the fourth convex portion of the fourth inner radial protrusion are biased against the concave groove located on the outer wall of the cylindrical shank and fit into the concave groove.

7. A cutting tool assembly according to claim 6, wherein the opening of the split of the cylindrical retainer sleeve is positioned opposite to the outwardly protruding longitudinal external protrusion of the cylindrical retainer sleeve, and wherein the opening of the split of the cylindrical retainer sleeve is positioned between the first inner radial protrusion and the fourth inner radial protrusion.

8. A cutting tool assembly according to claim 6, wherein the outwardly protruding longitudinal external protrusion of the cylindrical retainer sleeve engages into the internal recessed groove of the inner cylindrical hole of the cutting drill bit holder to prevent axial movement of the cylindrical retainer sleeve within the inner cylindrical hole of the cutting drill bit holder.

9. A cutting tool assembly according to claim 6, wherein the first inner radial protrusion, the second inner radial protrusion, the third inner radial protrusion and the fourth inner radial protrusion are biased against the recessed groove located on the outer wall of the cylindrical shank and fit into the recessed groove to prevent axial movement of the cutting drill bit.

10. The cutting tool assembly of claim 6, wherein the cylindrical shank has a circumference that is smaller than a circumference of the shoulder.

11. The cutting tool assembly of claim 6, wherein the inner cylindrical bore of the cutting bit holder has a circumference that is larger than the circumference of the cylindrical shank.

12. The cutting tool assembly of claim 6, wherein the washer has a center hole circumference that is larger than a circumference of the cylindrical shank portion and has a center hole circumference that is smaller than a circumference of the shoulder portion.

13. The cutting tool assembly of claim 6, wherein the outer wall of the cylindrical retainer sleeve has a circumference that is smaller than the circumference of the inner cylindrical bore of the cutting bit holder.

14. The cutting tool assembly of claim 6, wherein the cylindrical retainer sleeve is made of a compressible material.

15. The cutting tool assembly of claim 14, wherein the opening of the split has a width of about 8 mm in an uncompressed state, and wherein the opening of the split is compressed to a width of less than about 8 mm to greater than about 1 mm.

16. A cylindrical retainer sleeve comprising: a cylindrical outer wall having a circumference and a longitudinal length; and a split located on the circumference of the outer wall, the split forming an opening on the cylindrical retainer sleeve, and wherein the split extends in the longitudinal direction along the longitudinal length of the cylindrical retainer sleeve, and wherein the cylindrical retainer sleeve has a longitudinal outer protrusion located on the outer wall protruding radially outward, one or more inner radial protrusions each having a convex portion, and wherein the cylindrical retainer sleeve fits within the inner cylindrical hole of the cutting drill bit holder, and wherein the cylindrical shank fits within the cylindrical retainer sleeve, and wherein the outwardly protruding longitudinal outer protrusion fits into an inner concave radial groove of the inner cylindrical hole of the cutting drill bit holder, and wherein the convex portion of each of the inner radial protrusions is biased against and fits into a concave groove located on the outer wall of the cylindrical shank.

17. A cylindrical retainer sleeve according to claim 16, wherein the retainer sleeve has: a first inner radial protrusion having a first convex portion, a second inner radial protrusion having a second convex portion, a third inner radial protrusion having a third convex portion, and a fourth inner radial protrusion having a fourth convex portion, and wherein the first convex portion of the first inner radial protrusion, the second convex portion of the second inner radial protrusion, the third convex portion of the third inner radial protrusion, and the fourth convex portion of the fourth inner radial protrusion are biased against a concave groove located on the outer wall of the cylindrical shank and fit into the concave groove.

18. A cylindrical retainer sleeve according to claim 17, including wherein the opening of the split of the cylindrical retainer sleeve is positioned opposite to the outwardly protruding longitudinal outer protrusion of the cylindrical retainer sleeve, and wherein the opening of the split of the cylindrical retainer sleeve is positioned between the first inner radial protrusion and the fourth inner radial protrusion.

19. The cylindrical retainer sleeve of claim 16, wherein the cylindrical retainer sleeve is made of a compressible material.

20. The cylindrical retainer sleeve of claim 16, wherein the opening of the split has a width of about 8 mm in an uncompressed state, and wherein the opening of the split is compressed to a width of less than about 8 mm to greater than about 1 mm.

21. A tool comprising a retainer sleeve having a longitudinal external protrusion to engage with an internal recessed radial groove of a tool holder, and wherein the retainer sleeve has one or more internal radial protrusions, each of which has a convex portion, and wherein each of the convex portions of each of the internal radial protrusions engages with a recessed groove in a shank of a rotating tool.

22. The tool of claim 21, wherein the longitudinal outer projection is angled to be introduced into the aperture of the tool holder to facilitate easier installation of the tool.

23. The tool of claim 22, wherein the angle of the longitudinal outer projection is in the range of 10° to 40°.

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