Cutting tool with hole saw mounting mandrel assembly

Abstract

A cutting tool may include a hole saw adapter configured to be coupled to a hole saw, the adapter comprising a first section, a second section opposite the first section, and a flange between the first and second sections, the first section comprising a threaded outer surface to receive the hole saw, and the second section comprising a polygonal outer surface.A cutting tool may comprise a receiving mandrel assembly comprising a coupling body defining a bore that receives the second section of the adapter, a shank extending from the coupling body and configured to be coupled to a power tool, a sleeve movable relative to the coupling body, and a retaining element positioned between the sleeve and the coupling body, the retaining element engaging with the second section of the adapter to detachably secure the adapter to the receiving mandrel assembly.

Description

Cross-reference to related registrations

[0001] This application claims priority over the simultaneously filed preliminary US patent application No. 63 / 722,688, which was filed on November 20, 2024, the entire contents of which are incorporated herein by reference. background

[0002] The present invention relates to mandrel assemblies and in particular to quick-release mandrel assemblies for hole saws.

[0003] A hole saw is typically coupled to a rotating power tool using a mandrel assembly. An opening defined by the hole saw is designed to receive a section of the mandrel assembly. Furthermore, the opening corresponds to the threads of this section of the mandrel assembly, allowing the hole saw to be rotatably coupled to the threads of this section. A quick release of the hole saw from the mandrel assembly is generally desirable. Summary

[0004] In some aspects, the techniques described herein relate to a cutting tool comprising: a hole saw adapter configured to be coupled to a hole saw, the adapter comprising a first section, a second section opposite the first section, and a flange between the first and second sections, the first section comprising a threaded outer surface to receive the hole saw, and the second section comprising a polygonal outer surface;and a receiving mandrel assembly comprising a coupling body defining a bore that receives the second section of the adapter, a shaft extending from the coupling body and configured to be coupled to a power tool, a sleeve movable relative to the coupling body, and a retaining element arranged between the sleeve and the coupling body, the retaining element engaging with the second section of the adapter to detachably secure the adapter to the receiving mandrel assembly.

[0005] In some aspects, the techniques described herein relate to a cutting tool comprising: a hole saw; a pilot drill; a receiving mandrel assembly with a coupling body defining a longitudinal axis, the coupling body comprising a central bore receiving the pilot drill and a first opening extending into the central bore, a shank extending from the coupling body and configured to couple with a power tool, and a sleeve held by the coupling body comprising a second opening, the sleeve being movable between a first position in which the hole saw is coupled to the receiving mandrel assembly and a second position in which the hole saw can be selectively detached from the receiving mandrel assembly; and a retaining element that can be received through the first and second openings to secure the pilot drill to the receiving mandrel assembly.

[0006] In some aspects, the techniques described herein relate to a cutting tool comprising: a hole saw; a pilot drill; a hole saw adapter coupled to the hole saw, the adapter comprising a main body with a first section, a second section opposite the first section and a flange between the first and second sections, and a collar comprising pins which are received by the hole saw, the collar being selectively secured to the main body and axially movable relative to the main body;and a receiving mandrel assembly comprising a coupling body defining a bore that receives the second section of the adapter, wherein the coupling body defines a longitudinal axis of the receiving mandrel assembly, a shaft extending from the coupling body and configured to be coupled to a power tool, a sleeve movable relative to the coupling body in a direction parallel to the longitudinal axis, and a retaining element arranged between the sleeve and the coupling body, wherein the retaining element engages with the second section of the adapter to detachably secure the adapter to the receiving mandrel assembly.

[0007] Further aspects of the invention become clear from the detailed description and the accompanying drawings. Brief description of the drawings Fig. Figure 1 is a perspective view of a hole saw and a mounting mandrel assembly. Fig. Figure 2 is a perspective exploded view of the receiving mandrel assembly. Fig. 1. Fig. Figure 3 is a partially exploded cross-sectional view of the receiving mandrel assembly made of Fig. Figure 1 shows the assembly of the receiving mandrel assembly. Fig. 4 is a cross-sectional view of the receiving mandrel assembly made of Fig. Figure 1 shows the disassembly of the receiving mandrel assembly. Fig. Figure 5 is a perspective view of an adapter of the mounting mandrel assembly. Fig. Figure 6 is a top view of an adapter of the receiving mandrel assembly according to a further embodiment. Fig. Figure 7 is a top view of an adapter of the receiving mandrel assembly according to a further embodiment. Fig. Figure 8 is a perspective exploded view of an adapter according to a further embodiment. Fig. Figure 9 is a perspective exploded view of an adapter according to a further embodiment. Fig. Figure 10 is a perspective exploded view of an adapter according to a further embodiment. Fig. Figure 11 is a perspective exploded view of a receiving mandrel assembly according to a further embodiment. Detailed description

[0008] Before any embodiments of the invention are explained in detail, it should be noted that the application of the invention is not limited to the design details and the arrangement of components listed in the following description or illustrated in the following drawings. The invention is also possible in other embodiments and can be carried out or implemented in various ways.

[0009] Out of Fig. Figure 1 shows a cutting tool 10 comprising a hole saw 14, a pilot drill 18, and a mandrel assembly 22. The mandrel assembly 22 allows different types and / or sizes of hole saws and pilot drills to be interchangeably coupled to it without the need for tools. In some embodiments, a tool is required to couple the pilot drill 18 to the mandrel. Furthermore, if one part fails first (for example, the mandrel assembly 22, the pilot drill 18, or the hole saw 14), the user can remove and replace that part instead of having to discard the entire cutting tool 10.

[0010] The hole saw 14 comprises a generally cylindrical body 26 with a first or closed end 30 and a second or open end 34. The closed end 30 is configured to be attached to the receiving mandrel assembly 22 to connect the hole saw 14 to a power tool (for example, a drill). The open end 34 comprises a toothed form 38 configured to cut through a workpiece. In the illustrated embodiment, the toothed form 38 is defined by a repeating pattern of cutting teeth and slots. In other embodiments, the toothed form 38 may have other configurations. At least one opening 42 is formed in the body 26 of the illustrated hole saw 14 between the closed and open ends 30, 34 to facilitate the removal of chips and plugs from the hole saw 14.

[0011] The closed end 30 of the hole saw 14 also includes an end cap 46 that is coupled to the cylindrical body 26. Although not shown, the end cap 46 defines an opening that receives a section of the receiving mandrel assembly 22 to couple the hole saw 14 to the receiving mandrel assembly 22. In some embodiments, the opening includes threads that align with threads on a section of the receiving mandrel assembly 22 to couple the hole saw 14 to the receiving mandrel assembly 22. In some embodiments, the end cap 46 may also include openings that receive pins of the receiving mandrel assembly 22, as explained in more detail below.

[0012] The guide drill 18 is coupled to the receiving mandrel assembly 22 and surrounded by the hole saw 14. The guide drill 18 comprises a cutting section 62 and a shank (not shown). The cutting section 62 projects beyond the open end 34 of the cylindrical body 26. The shank is generally hexagonal and corresponds to a section of the receiving mandrel assembly 22 that accommodates the guide drill 18. In other embodiments, the shank may be circular or have another configuration. In the embodiment shown, the guide drill 18 is a twist drill. In other embodiments, the guide drill 18 may be other types of drills, for example, a spade drill. The hole saw 14 and the guide drill 18 are both separately detachable from the receiving mandrel assembly 22.

[0013] With reference to Fig. The illustrated receiving mandrel assembly 22 comprises a coupling body 70, a shank 74, a sleeve 78, a collar 82, a preload element 86 (for example, a coil spring), and an adapter 90. The coupling body 70 includes a first end 94 and a second end 98 opposite the first end 94. The coupling body 70 defines a longitudinal axis 100 of the receiving mandrel assembly 22, which extends centrally through the coupling body 70 between the first and second ends 94, 98. The first end 94 of the coupling body 70 defines a first bore 102 with a first section 106, which serves to receive the shank of the guide drill 18, and a second section 110, which serves to receive a section of the adapter 90.

[0014] In the illustrated embodiment, the first section 106 and the second section 110 have hexagonal cross-sections. Thus, the first and second sections 106, 110 are similarly shaped. However, the cross-section of the first section 106 is smaller than the cross-section of the second section 110. In further embodiments, the first section 106 and the second section 110 can have differently shaped cross-sections. For example, the first section 106 can have a circular cross-section and the second section 110 a hexagonal cross-section. In still further embodiments, the first section 106 and / or the second section 110 can have other circular or non-circular cross-sectional shapes, such as square, D-shaped, oblong, and the like. A fastening opening 114 extends from an outer surface 130 of the coupling body 70 into the first section 106 of the first bore 102.

[0015] The second end 98 of the coupling body defines a projection 118 and a second bore 122. In some embodiments, the first and second bores 102, 122 can be connected, so that a single bore extends between the first and second ends 94, 98 of the coupling body 70. A spring seat 126 is defined between the projection 118 and the outer surface 130 of the coupling body 70. When the receiving mandrel assembly 22 is assembled, the preload element 86 is supported on the coupling body 70 adjacent to the spring seat 126. The outer surface 130 of the coupling body 70 is cylindrical. The outer surface 130 also defines a plurality of elongated slots 134 that extend into the first bore 102. The elongated slots 134 support retaining elements when the receiving mandrel assembly 22 is assembled. In the illustrated embodiment, the retaining elements are ball detents 138.In further embodiments, the retaining elements can be other types of retaining elements, such as retaining pins, springs, clips, and the like. The elongated slots 134 are dimensioned such that the ball detents 138 can move within the slots 134 in a direction parallel to the longitudinal axis 100, while a section of the ball detents 138 extends through the longitudinal slots 134 into the first bore 102. In the illustrated embodiment, the coupling body 70 comprises three elongated slots 134 arranged evenly around the cylindrical outer surface 130. In further embodiments, the coupling body 70 can comprise more than three elongated slots 134 or fewer than three elongated slots 134.

[0016] The shaft 74 comprises a first end 142 and a second end 146 opposite the first end 142. The first end 142 of the shaft 74 is hexagonally shaped and detachably coupled to the coupling body 70. In particular, the first end 142 of the shaft 74 is press-fitted into the second bore 122 of the coupling body 70 to couple the shaft 74 to the coupling body 70. In some embodiments, the first end 142 of the shaft 74 can be welded to the coupling body 70 and / or secured to the coupling body 70 with fasteners. In further embodiments, the first end 142 of the shaft 74 and the second bore 122 of the coupling body 70 can be shaped differently (for example, circular or non-circular). In further embodiments, the coupling body 70 and the shaft 74 can be designed as a single, integral part.The second end 146 of the shaft 74 comprises a hexagonal shank 150 with an annular groove 152 designed to be received by and engage with a chuck of the power tool. In further embodiments, the second end 146 may comprise other suitable shanks or coupling mechanisms for connection to a power tool. In the illustrated embodiment, the shaft 74 may be a 3 / 8" or a 7 / 16" shank. In further embodiments, the shaft 74 may have other dimensions.

[0017] The sleeve 78 is held on the coupling body 70 and is movable (e.g., displaceable) along the coupling body 70 in a direction parallel to the longitudinal axis 100. In some embodiments, the sleeve 78 can also or alternatively be rotated relative to the coupling body 70. The illustrated sleeve 78 is defined by a cylindrical wall 154 extending around the longitudinal axis 100. In some embodiments, the wall 154 defines an outer gripping surface with a knurled ring 162 ( Fig. 11), which extends circumferentially around the sleeve 78. The knurled ring 162 assists the user in gripping the receiving mandrel assembly 22 during use. A plurality of ball detent openings 166 extend through the wall 154 and into the interior of the sleeve 78. When the receiving mandrel assembly 22 is assembled, the ball detent openings 166 are arranged adjacent to the elongated slots 134 of the coupling body 70. In the embodiment shown, the sleeve 78 comprises three ball detent openings 166, corresponding to three elongated slots 134. In other embodiments, the sleeve 78 may comprise more or fewer than three ball detent openings 166. The sleeve 78 also includes a fastening opening 170 extending into the interior. When the receiving mandrel assembly 22 is assembled, the fastening opening 114 of the coupling body 70 and the fastening opening 170 of the sleeve 78 are aligned.An adjusting screw 174 or other retaining element can be inserted into the first section 106 of the first bore 102 through the fastener opening 170 of the sleeve 78 and the fastener opening 114 of the coupling body 70 to secure the guide drill 18 to the coupling body 70. The inner surface of the wall 154 defines a circumferential rib 176. The preload element 86 is positioned between the projection 118 of the coupling body 70 and the rib 176 when the receiving mandrel assembly 22 is assembled. The preload element 86 engages the rib (for example, pushes against it) to push the sleeve 78 away from the projection 118 of the coupling body 70.

[0018] The collar 82 rests on the first end 94 of the coupling body 70. In the illustrated embodiment, the collar 82 is fixed axially relative to the coupling body 70 by a coupling mechanism (for example, thread, adhesive, fasteners, press fit, welding, etc.). In further embodiments, the collar 82 can be axially movable relative to the coupling body 70. In further embodiments, the collar 82 and the coupling body 70 can be formed as a single integral part. The collar 82 is generally annular and comprises a conically shaped, inclined inner surface 178. During assembly of the receiving mandrel assembly 22, the ball detents 138 are positioned between the inner surface 178 and the elongated slots 134. The sleeve 78 presses the ball detents 138 into the inclined inner surface 178, so that a radially inward force is exerted on the ball detents 138.

[0019] With reference to Fig. 3 and Fig. In Figure 5, the adapter 90 comprises a first section 182, a second section 186, and a flange 190 separating the first section 182 from the second section 186. The first section 182 of the adapter 90 comprises a non-circular (e.g., polygonal) outer surface that includes multiple side faces 194. In particular, the first section 182 of the adapter 90 is hexagonal and includes six side faces 194. In other embodiments, the first section 182 may include more than or fewer than six side faces 194. Each side face 194 of the first section 182 is smooth and continuous or uninterrupted between the flange 190 and the end of the first section 182. In other words, there are no grooves, openings, projections, or other features on the side faces 194. In the embodiment shown, the first section 182 of the adapter 90 is a 9 / 16" shaft.In further embodiments, the first section 182 of the adapter can be a 7 / 16" shank, a 1 / 2" shank, or a shank of another size. The first section 182 is dimensioned to engage in the second section 110 of the first bore 102 of the coupling body 70. The second section 186 of the adapter 90 includes a threaded projection 198 that engages with the threaded opening on the hole saw 14. As shown in . Fig. 6 and Fig. As shown in Figure 7, the threaded projection 198 can be of different sizes to accommodate hole saws of varying sizes. The flange 190 has a larger diameter than both the first section 182 and the second section 186. A channel 202 extends centrally through the adapter 90 between the first and second sections 182 and 186. The channel 202 is designed to receive and retain the pilot drill 18. The adapter 90 is designed to be interchangeable with the receiving mandrel assembly 22. In other words, the receiving mandrel assembly 22 can comprise multiple adapters 90, each adapter 90 comprising a hole saw that differs from another hole saw (for example, different sizes). In further embodiments, the adapter 90 is a separate component of the cutting tool 10 from the receiving mandrel assembly 22.

[0020] To assemble the cutting tool 10, a user can first secure the hole saw 14 to the adapter 90 by coupling the threaded projection 198 with the threaded hole of the hole saw 14. As shown in Fig. As shown in Figure 3, to couple the adapter 90 and the hole saw 14 to the receiving mandrel assembly 22, a user can align the first section 182 of the adapter 90 with the second section 110 of the first bore 102 and move the adapter 90 axially into the first bore 102 until the flange 190 contacts the coupling body 70. When the first section 182 of the adapter 90 is received in the first bore 102, the ball detents 138 engage the side surfaces 194. As the sleeve 78 presses the ball detents 138 against the inclined inner surface 178, the ball detents 138 exert a force on the side surfaces 194 to secure the adapter 90 to the receiving mandrel assembly 22. In other words, the ball detents 138 form a wedge between the collar 82 and the adapter 90 to secure the adapter 90 to the mounting mandrel assembly 22.When the adapter 90 is secured to the receiving mandrel assembly 22, a user can selectively couple the pilot drill 18 to the receiving mandrel assembly 22. Specifically, a user can push the pilot drill 18 through the channel 202 of the adapter 90 so that the shank is received in the first section 106 of the first bore 102. The set screw 174 can then be inserted through the fastening opening 170 of the sleeve 78 and the fastening opening 114 of the coupling body 70, so that the set screw 174 engages a side face of the shank to secure the pilot drill 18 to the receiving mandrel assembly 22. In some embodiments, the pilot drill 18 can be coupled to the receiving mandrel assembly 22 before the adapter 90 is coupled to the coupling body 70.

[0021] Out of Fig. Figure 4 shows that, to decouple the adapter 90 from the receiving mandrel assembly 22, a user can axially displace the sleeve 78 against the preload of the preloading element 86 in the direction of the projection 118 of the coupling body 70. As the sleeve 78 is displaced, the ball detents 138 between the collar 82 and the side surfaces 194 are released and can move axially in the elongated slots 134. When the radially inward force is removed from the adapter 90, the user can push the adapter 90 axially away from the receiving mandrel assembly 22 and out of the first bore 102. As mentioned above, the user can then choose to couple another adapter and a hole saw to the receiving mandrel assembly 22.

[0022] In some embodiments, the hole saw 14 may include openings next to the threaded opening in the end cap 46, which receive locking pins from the receiving mandrel assembly 22, which help to secure and transmit the torque between the hole saw 14 and the receiving mandrel assembly 22. Fig. Figure 8 shows an adapter 310 for use with a hole saw with openings. The adapter 310 is similar to the adapter 90 described above, with identical features represented by the same reference numerals. The adapter 310 comprises a main body 314 and a collar 318, which is selectively movable relative to the main body 314. The main body 314 comprises the first section 182, the second section 186, and the flange 190. The flange 190 includes two semicircular recesses 320, and the first section 182 includes grooves 322 arranged between adjacent side surfaces 194. The collar 318 includes a central opening 326 and two pins 330 extending from a top surface. A retaining ring 334 (for example, an O-ring) extends around the circumference of the central opening 326. The retaining ring 334 is received in the grooves 322 to secure the collar 318 to the main body 314.To couple a hole saw to the adapter 310, a user first pulls back the collar 318 relative to the main body 314 and removes the retaining ring 334 from the grooves 322. The user can then screw a hole saw onto the second section 186 of the main body 314. Next, the user can move the collar 318 toward the flange 190, aligning the pins 330 with the semicircular recesses 320, until the collar 318 is flush with the flange 190.

[0023] Fig. Figure 9 shows an adapter 410 according to a further embodiment. The adapter 410 is similar to the adapter 310 described above, with identical features represented by the same reference numerals. The adapter 410 comprises a main body 414 and a collar 418, which is selectively secured to the main body 414 and axially movable relative to the main body 414. The main body 414 comprises a first section 422, a second section 426, and a flange 430 that separates the first section 422 from the second section 426. The second section 426 comprises a threaded projection 434 and a contoured outer surface 438 between the flange 430 and the threaded projection 434. The contoured outer surface 438 comprises two flat sections 438A, which correspond to two flat sections 418B on the collar 418, although only one of them is shown at any given time.The flat sections 438A and 418B enable a uniform transmission of torque from the main body 414 to the collar 418. The contoured outer surface 438 also includes a groove 442 on one side of the outer surface 438. The collar 418 includes a central bore 446, two pins 450 extending from a top surface, and a retaining mechanism 454 received in an opening 458. The retaining mechanism 454 includes a ball detent 462, a preload element 466 (for example, a compression spring), and a plug 470. The preload element 466 is located between the ball detent 462 and the plug 470 and presses the ball detent 462 into the central bore 446 to engage in the groove 442. To couple a hole saw with the adapter 410, the user first pulls the collar 418 towards the flange 430, thereby pushing the ball detent 462 out of engagement with the groove 442.A user can then thread the hole saw onto the second section 422 of the main body 414. Next, a user can move the collar 418 toward the hole saw while aligning the pins 450 with the openings on the end cap 46 until the ball detent 462 re-engages in the groove 442.

[0024] In Fig. Figure 10 shows an adapter 510 according to a further embodiment of the invention. The adapter 510 is similar to the adapter 410 described above, with identical features represented by the same reference numerals. The second section 426 of the main body 414 comprises a first threaded projection 514 and a second threaded projection 518 extending from the first threaded projection 514. The first threaded projection 514 is configured to receive hole saws with a threaded opening of a first size, and the second threaded projection 518 is configured to receive hole saws with a threaded opening of a second size. For example, the first threaded projection 514 may comprise a 5 / 8-18 thread, and the second threaded projection 518 may comprise a 1 / 2-20 thread. In further embodiments, the first threaded projection 514 and / or the second threaded projection 518 may have different thread sizes.

[0025] Fig.Figure 11 illustrates a receiving mandrel assembly 610 according to a further embodiment. The receiving mandrel assembly 610 is similar to the receiving mandrel assembly 22 discussed above, with identical features represented by the same reference numerals, and only the differences are described in detail below. In particular, the receiving mandrel assembly 610 comprises a shaft 614 that is integral with the coupling body 70. Furthermore, the collar 82 is axially fixed relative to the coupling body 70 by using a retaining ring 618 in addition to or instead of the coupling mechanism described above. The sleeve 78 also includes a band 622 that extends circumferentially around the sleeve 78. The band 622 can indicate to a user the best position for grasping the receiving mandrel assembly 610. The band 622 can also include markings (for example, branding) associated with the receiving mandrel assembly 610.

[0026] Although the invention has been described in detail with reference to certain preferred embodiments, there are variations and modifications within the scope and concept of one or more independent aspects of the invention as described.

[0027] Various features of the disclosure are set forth in the following claims. QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] US 63 / 722,688

[0001]

Claims

[1] Cutting tool, comprising: a hole saw adapter designed to be coupled to a hole saw, the adapter comprising a first section, a second section opposite the first section, and a flange between the first and second sections, the first section comprising a threaded outer surface for receiving the hole saw, and the second section comprising a polygonal outer surface; and a receiving mandrel assembly comprising: a coupling body that defines a bore which accommodates the second section of the adapter, a shaft extending from the coupling body and designed to be coupled to a power tool, a sleeve that is movable relative to the coupling body, and a retaining element arranged between the sleeve and the coupling body, wherein the retaining element engages with the second section of the adapter to detachably secure the adapter to the receiving mandrel assembly. [2] Cutting tool according to claim 1, wherein the polygonal outer surface comprises six sides. [3] Cutting tool according to claim 1, wherein the polygonal outer surface is continuous between the flange and an end of the second section. [4] Cutting tool according to claim 1, wherein the coupling body comprises an elongated slot which holds the retaining element. [5] Cutting tool according to claim 4, wherein the receiving mandrel assembly further comprises a collar coupled to the coupling body and the collar secures the retaining element in the elongated slot between the sleeve and the coupling body. [6] Cutting tool according to claim 5, wherein the collar comprises a conically shaped, inclined inner surface and the inner surface pre-tensions the retaining element to engage with the second section of the adapter. [7] Cutting tool according to claim 1, wherein the sleeve is movable relative to the coupling body between a first position in which the adapter is secured to the receiving mandrel assembly and a second position in which the adapter is detachable from the receiving mandrel assembly. [8] Cutting tool according to claim 7, wherein the receiving mandrel assembly further comprises a preloading element arranged between the coupling body and the sleeve, wherein the preloading element preloads the sleeve into the first position. [9] Cutting tool according to claim 1, wherein the bore comprises a first section and a second section adjacent to the first section, the first section being configured to receive a pilot drill and the second section receiving the second section of the adapter. [10] Cutting tool according to claim 1, wherein the hole saw adapter defines a main body and the hole saw adapter further comprises a collar comprising pins which are arranged to be received by the hole saw. [11] Cutting tool according to claim 10, wherein the collar is selectively secured to the main body and is axially movable relative to the main body. [12] Cutting tool according to claim 1, wherein the hole saw adapter is a first hole saw adapter configured to receive a hole saw of a first size, and the cutting tool further comprises a second hole saw adapter configured to receive a hole saw of a second size, wherein the first size is different from the second size. [13] Cutting tool according to claim 1, wherein the threaded outer surface is a first threaded projection and the first section of the hole saw adapter further comprises a second threaded projection extending from the first threaded projection. [14] Cutting tool according to claim 13, wherein the first threaded projection is configured to accommodate hole saws with a threaded opening of a first size, and the second threaded projection is configured to accommodate hole saws with a threaded opening of a second size which differs from the first size. [15] Cutting tool, comprising: a hole saw; a pilot drill; a receiving mandrel assembly comprising: a coupling body defining a longitudinal axis, wherein the coupling body comprises a central bore that accommodates the guide drill, and a first opening extending into the central bore, a shaft extending from the coupling body, which is designed for coupling with a power tool, and a sleeve mounted on the coupling body and comprising a second opening, wherein the sleeve is movable between a first position in which the hole saw is coupled to the receiving mandrel assembly and a second position in which the hole saw can be selectively detached from the receiving mandrel assembly; and a holding element that can be received through the first and second openings to secure the guide drill to the receiving mandrel assembly. [16] Cutting tool according to claim 15, wherein the bore comprises a first section which receives the guide drill and a second section which is configured to receive an adapter for the hole saw. [17] Cutting tool according to claim 16, wherein the first section and the second section have a similar shape. [18] Cutting tool according to claim 17, wherein the first section is smaller than the second section. [19] Cutting tool according to claim 15, wherein the retaining element is an adjusting screw. [20] Cutting tool, comprising: a hole saw; a pilot drill; a hole saw adapter coupled to the hole saw, wherein the adapter comprises: a main body comprising a first section, a second section opposite the first section, and a flange between the first and second sections, and a collar comprising pins received by the hole saw, wherein the collar is selectively secured to the main body and axially movable relative to the main body; and a receiving mandrel assembly comprising: a coupling body defining a bore that receives the second section of the adapter, wherein the coupling body defines a longitudinal axis of the receiving mandrel assembly, a shaft extending from the coupling body and designed to be coupled to a power tool, a sleeve which is movable relative to the coupling body in a direction parallel to the longitudinal axis, and a retaining element arranged between the sleeve and the coupling body, wherein the retaining element engages in the second section of the adapter to detachably secure the adapter to the receiving mandrel assembly.

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