TOOL AND TOOL HOLDERS FOR A ROTATING AGRICULTURAL IMPACT AND VEHICLE FOR IT

Abstract

An agricultural implement includes a rotating drum assembly, which in turn includes a tool assembly. The tool assembly includes a tool holder and a tool. The tool includes a variety of claws. The tool holder includes a variety of claw mounts. The claws and claw mounts work together to allow a detachable coupling of the tool to the tool holder.

Description

TECHNICAL AREA A tool and tool holder are provided for rotary agricultural implements, such as cutting, grinding, mulching, and / or shredding tools. The tool has a variety of claws, and the tool holder includes claw mounts that allow for detachable coupling between them. BACKGROUND Land cultivation and clearing machinery, such as forestry mulchers and land clearing equipment, can be used for vegetation management, land clearing, road construction, and the removal of debris, bushes, trees, vegetation, soil, concrete, asphalt, rocks, and / or other materials to prepare the land for further development or use. To perform these tasks, such machines may include a land cultivation attachment capable of mulching, cutting, shredding, and / or grinding vegetation, bushes, trees, tree stumps, soil, concrete, asphalt, rocks, and other materials. The agricultural implement can be permanently mounted or detachably attached to a vehicle, such as a tractor or compact loader, to provide, for example, a joint connection and movement of the implement relative to the vegetation. Often, the vehicle can be a multi-purpose vehicle that can be equipped with a variety of implements suitable for other tasks. BRIEF DESCRIPTION OF THE DRAWINGS Various embodiments are better understood with reference to the following descriptions, the attached claims, and the accompanying drawings, wherein: Fig. 1 is an isometric side view depicting a vehicle incorporating a rotating agricultural implement with a rotatable drum assembly; Fig. 2 is a front view of the vehicle from Fig. 1; Fig. 3 is a partial exploded view of the rotatable drum assembly from Fig. 1 with a tool assembly shown in association therewith; Fig. 4 is an isometric upper front view of the tool assembly from Fig. 3, which includes a tool holder and a tool according to one embodiment; Fig. 5 is an isometric upper exploded front view of the tool assembly from Fig. 4; Fig. 6 is an isometric upper rear view of the tool from Fig. 4; Fig. 7 is an isometric lower rear view of the tool from Fig. 6; Fig.Fig. 8 is a cross-sectional view along line 8-8 in Fig. 7; Fig. 9 is an isometric left upper front view of the tool holder from Fig. 4; Fig. 10 is an isometric left rear view of the tool holder from Fig. 4; Fig. 11 is an isometric right upper front view of the tool holder from Fig. 4; Fig. 12 is an isometric right rear view of the tool holder from Fig. 4; Fig. 13 is a partially isometric exploded view of the tool installed on the tool holder; Fig. 14 is a partially isometric exploded view of the tool further installed on the tool holder with reference to Fig. 13; Fig. 15 is a cross-sectional view along line 15-15 in Fig. 14; Fig. 16 is a cross-sectional view along line 16-16 in Fig. 14; Fig. 17 is a partially isometric exploded view of the tool, which is further installed on the tool holder with reference to Fig. 14; Fig.Fig. 18 is a cross-sectional view along line 18-18 in Fig. 17; Fig. 19 is a cross-sectional view along line 19-19 in Fig. 17; Fig. 20 is an isometric view of the tool installed on the tool holder; Fig. 21 is a cross-sectional view along line 21-21 in Fig. 20; Fig. 22 is a cross-sectional view along line 22-22 in Fig. 20; Fig. 23 is a cross-sectional view along line 23-23 in Fig. 4; Fig. 24 is an isometric upper front view of a tool assembly with a tool holder and a tool according to another embodiment; Fig. 25 is an isometric upper front view of the tool holder from Fig. 24; Fig. 26 is an isometric upper rear view of the tool from Fig. 24; Fig. 27 is an isometric upper front view of a tool assembly with a tool holder and a tool according to a further embodiment; Fig.Fig. 28 is an isometric upper front view of the tool holder from Fig. 27; Fig. 29 is an isometric upper rear view of the tool from Fig. 27; Fig. 30 is an isometric upper front view of a tool assembly with a tool holder and a tool according to a further embodiment; Fig. 31 is an isometric upper front view of a tool assembly with a tool holder and a tool according to a further embodiment; Fig. 32 is an isometric upper front view of a tool assembly with a tool holder and a tool according to a further embodiment; Fig. 33 is an isometric upper exploded front view of the tool assembly from Fig. 32; Fig. 34 is an isometric upper rear view of the tool from Fig. 32; Fig. 35 is an isometric lower rear view of the tool from Fig. 32; Fig. 36 is an isometric upper view of the tool from Fig. 32; Fig.Fig. 37 is a cross-sectional view along line 37-37 in Fig. 36; Fig. 38 is an isometric left upper front view of the tool holder from Fig. 32; Fig. 39 is an isometric left rear view of the tool holder from Fig. 32; Fig. 40 is another isometric upper front view of the tool assembly from Fig. 31; Fig. 41 is a cross-sectional view along line 41-41 in Fig. 40; Fig. 42 is a cross-sectional view along line 42-42 in Fig. 40; Fig. 43 is an isometric upper rear view of a tool according to a further embodiment; Fig. 44 is an isometric lower rear view of the tool from Fig. 43; Fig. 45 is an isometric upper rear view of a tool according to a further embodiment; Fig. 46 is an isometric lower rear view of the tool from Fig. 45; Fig. 47 is an isometric upper left front view of a tool holder according to a further embodiment; Fig.Fig. 48 is an isometric upper right front view of the tool holder from Fig. 47; and Fig. 49 is an isometric upper front view of a tool assembly according to a further embodiment. DETAILED DESCRIPTION This disclosure is generally directed to agricultural and clearing machinery (“Agricultural Machinery”) and its corresponding attachments, which are generally designed to cut, grind, mulch, shred, remove, grind, and / or mix trees, bushes, ground cover, vegetation, rubble, asphalt, concrete, and / or soil. The Agricultural Machinery and its corresponding attachments may comprise a variety of vehicles, including but not limited to skid steer loaders, forestry machinery and vehicles, power take-off tractors, agricultural tractors, and / or any other known vehicle, and may have corresponding attachments compatible with Agricultural and Clearing Machinery. Such Agricultural Machinery may prepare the soil surface and subsoil.As used herein, the terms "land cultivation and clearing" and "land cultivation" mean all land cultivation and clearing operations, including but not limited to forestry operations, such as cutting, grinding, mulching, shredding, removing, grinding, and / or mixing trees, shrubs, ground cover, vegetation, rubble, rocks, asphalt, concrete, and / or soil. As used herein, "source material" describes trees, shrubs, ground cover, vegetation, rubble, rocks, asphalt, concrete, and / or soil resulting from such land cultivation and clearing operations, including but not limited to forestry operations, such as clearing land, cutting and / or mulching trees, and / or working land surfaces (e.g., constructing roads). In conjunction with the views and examples from Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22, Fig. 23, Fig. 24, Fig. 25, Fig. 26, Fig. 27, Fig. 28, Fig. 29, Fig. 30, Fig. 31, Fig. 32, Fig. 33, Fig. 34, Fig. 35, Figs. 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48 to 49, where the same numbers indicate the same or corresponding element in all views, Figs. 1 and 2 show an agricultural machine 10 which may enclose a vehicle 12 (e.g. a forestry vehicle) and an agricultural implement 14 which is attached to the vehicle 12.In this illustrative embodiment, the vehicle 12 is a compact loader suitable for off-road driving and includes a vehicle body 15 that contains a passenger compartment 16 and a pair of track assemblies 18, each enclosing a track 20 that is guided around and driven by track drive sprockets 22 rotatably coupled to the vehicle body 15. In an alternative embodiment, the vehicle 12 may include tires that accommodate off-road tracks or not. The vehicle 12 may also include a lifting assembly 24 for vertically positioning the agricultural implement 14. The lifting assembly 24 may include one or more lifting arms 26 coupled to the agricultural implement 14 and may be hydraulically or electrically driven.Controls (not shown) can be provided to control the lifting arrangement 24, including the lifting arms 26, and to control the operation of the chain arrangement 18 and the tillage implement 14. While the illustrated vehicle 12 is a compact loader, other suitable vehicles capable of powering or utilizing a hydraulic motor attachment or tool (e.g., an agricultural implement 14) may also be considered, such as other forestry vehicles, mini track loaders, excavators, backhoe loaders, power take-off tractors, agricultural tractors, and / or any other known vehicles and their corresponding implements compatible with agricultural work and clearing. Further examples of suitable compact loader vehicles are illustrated and described in U.S. Patents Nos. 4,168,757 and 4,209,071, the entire disclosure of which is hereby incorporated by reference. In some embodiments, the vehicle 12 may be remotely controlled or operated by an autonomous control system. The agricultural implement 14 can be detachably connected to the lifting arms 26. The connection between the agricultural implement 14 (or any other attachment) and the lifting arms 26 can be achieved in a variety of ways. For example, mounting points (not shown) can be provided on a rear section of the agricultural implement 14 to allow connection to the lifting arms 26 of the vehicle 12. In particular, such flanges and / or other rear sections of the agricultural implement 14 can define one or more bolt holes for receiving the connecting bolts (not shown).In certain embodiments, the agricultural implement 14 may include a hydraulic supply port for receiving an operating supply of hydraulic fluid from a pump in the vehicle to drive the agricultural implement 14, and a hydraulic return port for returning hydraulic fluid to a tank in the vehicle 12. The hydraulic supply and return ports may include conventional quick-release couplings, as is known to anyone skilled in the art. In such embodiments, a hydraulic cooler may be provided to maintain the supply of hydraulic fluid at a desired temperature and viscosity. In such embodiments, the hydraulic cooler may be mounted on the vehicle 12. It is understood that in certain embodiments, the agricultural implement 14 may be permanently attached to the vehicle 12. It is also understood that in certain embodiments, an agricultural implement may be a standalone machine, such as a hand-held agricultural implement. It is also understood that other hydraulically operated rotary mower or cutting attachments may be used, based on principles according to one or more of the embodiments illustrated and described herein, which may be permanently attached to the vehicle 12 or detachable and / or separate from or in combination with the agricultural implement 14. Other configurations are also possible, for example, with the fluid pump and tank being located in different positions. The connection, drive, and movement of the agricultural implement 14 can be achieved with various configurations, such as that described in US Patent No.4,148,366 and 5,813,792, which are hereby incorporated herein by reference. With further reference to Figs. 1 and 2, the agricultural implement 14 can include a housing 28 with right and left end caps 32 and 34, respectively, but it is understood that other types of first and second ends can be provided. As shown in Fig. 2, the housing 28 can further include a frame 35 which extends between and is connected to the right and left end caps 32 and 34. The agricultural implement 14 can also include a rotatable drum assembly 36 which is movably (e.g., rotatably) connected in a chamber 30 to and between the right and left end caps 32 and 34. In some embodiments, the right and left end caps 32 and 34 can be fixedly attached to the housing 28. The rotatable drum assembly 36 can define a longitudinal axis and include a rotatable drum 38.It is understood that, although the rotatable drum 38 is shown to be essentially cylindrical, non-cylindrical rotatable drums can also be considered. The rotating drum assembly 36 can also include a variety of tool assemblies 40 responsible for removing the feed material upstream of the rotating drum assembly 36. The tool assemblies 40 can be arranged along an outer circumference of the rotating drum 38 and spaced longitudinally apart from one another. The tool assemblies 40 can be arranged in a helical pattern to optimize their performance in removing the feed material. The tool assemblies 40 can include any variety of suitable cutting, grinding, mixing devices and / or tools, and any combination thereof, for cutting, grinding, mulching, crushing, removing, milling, and / or mixing the feed material. Examples of various tool assemblies arranged on a rotating drum are illustrated in U.S. Publication No. 2009 / 0050341 A1, which is incorporated herein in full by reference. The rotatable drum assembly 36 can include a plurality of depth control rings 42 (Fig. 3) coupled to the rotatable drum 38 and extending radially outward from it. The depth control rings 42 can be spaced longitudinally apart from one another along the length of the rotatable drum 38. Each depth control ring 42 can be aligned with one of the tool assemblies 40 and have a height less than the overall height of the tool assembly 40 to which it is aligned. The height difference between the tool assembly 40 and the depth control ring 42 can define a depth of cut for the tool assembly 40. The height of the depth control rings 42 can be selected to achieve a desired depth of cut, which is typically between about 20% and about 80% of the overall height of the tool assembly 40, and more specifically between about 30% and about 60% of the overall height of the tool assembly 40.Several additional examples of depth control rings are disclosed in US Patent Publication No. 2017 / 0079219 A1, which is incorporated herein by reference in its entirety. When the tillage machine 10 and the tillage attachment 14 are in operation, the lifting arms 26 can be raised and lowered (via the controls) to raise or lower the tillage attachment 14 relative to the feed material to be removed by the tool assemblies 40. The housing 28 can also include a plurality of chains 44 held in position by a chain bar (not shown) extending substantially across the width of the housing 28 from the right end cap 32 to the left end cap 34, the chain bar being secured without welding or threading. The tillage implement 14 can include a protective assembly 46 extending upward from the frame 35 of the housing 28. In certain embodiments, the protective assembly 46 can include a measuring device (not shown) that enables visual measurements of width, for example, of trees and other vegetation. In one embodiment, for example, the center of the measuring device can have a zero reading, and distance markers can be provided in both directions extending laterally from it, the values ​​of these distance markers increasing as the distance from the center of the measuring device increases. By aligning, for example, trees or other vegetation with the center, a driver or operator can make real-time assessments to determine whether the trees or other vegetation are too large for the tillage implement 14.The measuring device can be attached to the protective assembly 46 in any suitable manner, such as by printing distance markings on it or by attaching a separately shaped measuring device to it, so that the measuring device is visible to the driver or operator of the agricultural machinery 10. Now, with reference to Fig. 3, the rotatable drum assembly 36 can include an axle hub 48 extending longitudinally from one end of the rotatable drum 38. The rotatable drum assembly 36 can include another axle hub (not shown) located at the opposite end of the rotatable drum 38 and similar to the axle hub 48 shown in Fig. 3. For illustrative purposes, the axle hub 48 in Fig. 3 is described here, but it is understood that this applies to both axle hubs (e.g., 48). The axle hub 48 can be detachably coupled to the rotatable drum 38 by a plurality of fasteners 50. A locking washer 52, a locking pin, or another suitable mechanism can be used together with one or more of the fasteners 50 to ensure secure attachment of the axle hub 48 to the rotatable drum 38. The rotatable drum assembly 36 can be coupled to a motor (not shown) in a ready-to-use configuration, enabling selective rotation of the rotatable drum 38. The motor can rotate the rotatable drum 38, and thus the plurality of tool assemblies 40, at a suitable speed to perform the field work (e.g., at speeds between approximately 100 rpm and approximately 3000 rpm). The motor can be coupled to the rotatable drum 38 in a ready-to-use configuration via a drive belt (not shown) or directly connected to the rotatable drum 38 or one of the axle hubs 48. In one embodiment, the motor can be a hydraulic motor, such as a hydraulic piston motor. In another embodiment, the motor can be an electrically driven motor. It is understood that the motor can be one of a plurality of suitable alternative motors that enable the operation of the rotatable drum 38.Several examples of hydraulically driven agricultural machinery are disclosed in US Patent Publication No. 2006 / 0032222, which is incorporated herein in full by reference. With further reference to Fig. 3, one of the depth control rings 42 is shown and will now be described. It is understood that it also represents the other depth control rings 42 of the rotatable drum assembly 36. The depth control rings 42 can include an inner circumference 54 and an outer circumference 56. The height of the depth control ring 42 can be defined as the distance between the inner and outer circumferences 54 and 56. The inner circumference 54 can be coupled to the rotatable drum 38 either by a fixed connection (e.g., welded, epoxy-bonded, tacked, or glued) or a detachable connection (e.g., with fasteners). The inner circumference 54 can be profiled similarly to the rotatable drum 38 to enable an effective connection between them when the depth control ring 42 is attached to the rotatable drum 38. The depth control ring 42 can define a groove 58 which can accommodate the tool assembly 40.In an alternative embodiment, the tool assembly 40 can be coupled to the depth control ring 42. Now, with reference to Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8, Fig. 9, Fig. 10, Fig. 11, Fig. 12, Fig. 13, Fig. 14, Fig. 15, Fig. 16, Fig. 17, Fig. 18, Fig. 19, Fig. 20, Fig. 21, Fig. 22 to Fig. 23, one of the tool assemblies 40 is shown and is now described here; it is understood that it also represents other tool assemblies 40 of the rotatable drum 38. As shown in Figs. 4 and 5, the tool assembly 40 can include a tool holder 60 and a tillage tool 62 (hereinafter referred to as "the tool 62"), which is detachably coupled to the tool holder 60, so that the tool 62 can be selectively attached to it. As shown in Fig. 5, the tool holder 60 can include a base flange 64 and a main housing 66, which extends upwards from the base flange 64.The main housing 66 can include a rear section 68 located at a rear end 70 of the tool holder 60 and a tool interface bar 72 located at a front end 74 of the tool holder 60 and extending from the rear section 68. The tool holder 60 can be attached to the rotatable drum 38 via the base flange 64. The base flange 64 can be welded, brazed, or attached by any of a variety of suitable alternative fastening methods. The base flange 64 can be profiled to fit the rotatable drum 38 appropriately for effective attachment. In one embodiment, the tool holder 60 can be formed from a single, one-piece structure, such as by a casting and machining process. The tool 62 can include a main housing 76 and a pair of cutting blades 78 extending from the main housing 76 and having a leading edge 79 that is essentially flat (e.g., an axis configuration). The cutting blades 78 can be positioned at a front end 80 of the tool 62 so that they are available to make contact with and cut the starting material during the rotation of the rotatable drum assembly 36. The cutting blades 78 can be vertically spaced apart, and the tool 62 can be positioned on the tool holder 60 such that one of the cutting blades 78 is higher than the other. The cutting blade 78 that is positioned higher on the tool holder 60 can be exposed above the depth control ring 42.During operation of the rotating drum assembly 36, the exposed cutting blade 78 can be primarily responsible for cutting the starting material, while the other cutting blade 78 is surrounded by the depth control ring 42 and effectively protected from the starting material. If the exposed cutting blade 78 becomes worn or otherwise ineffective for cutting, the tool 62 can be removed, reversed, and then reattached in the tool holder 60 in the reversed orientation to expose the other cutting blade 78 above the depth control ring 42.It is understood that, although a pair of cutting blades is shown and described, any of a variety of suitable alternative material engagement features for the tool 62 in agricultural and clearing applications may be considered, such as one or more cutters, blades, grinders, choppers, teeth, knives, hammer tools, milling tools, threshing tools or elements, carbide cutting edges, steel cutting edges, or composite cutting edges. It is also understood that the tool holder 60 and / or the tool 62 may be made of a variety of metals, composites, plastics, or combinations thereof. Referring again to Figures 4 and 5, the main housing 66 of the tool holder 60 can define a passage 82, and the main housing 76 of the tool 62 can define a passage 84. When the tool 62 is attached to the tool holder 60, the passages 82 and 84 can be substantially aligned to accommodate a fastener 86 that connects the tool holder 60 and the tool 62. In one embodiment, the passage 82 can be threaded so that the fastener 86 can be coupled to the tool holder 60 via a threaded connection. In another embodiment, a nut (not shown) can be screwed onto the fastener 86 to secure the tool holder 60 and the tool 62 together. Now, with reference to Figs. 6 and 7, the tool 62 can enclose a first side wall 90 and a second side wall 92 extending from the main housing 76 at a rear end 94 of the tool 62. The first and second side walls 90, 92 can be spaced apart from each other, and the main housing 76 can enclose a support surface 96 extending between the first and second side walls 90, 92. A pair of claws 98, 100 can extend from the first side wall 90 to the second side wall 92, such that the claws 98, 100 extend laterally inward from the first side wall 90. The claws 98, 100 can be spaced apart from each other and from the second side wall 92. The claws 98, 100 can cooperate with the first side wall 90 to define a passage 102 between them.A pair of claws 104, 106 can extend from the second side wall 92 to the first side wall 90, such that the claws 104, 106 extend laterally inwards from the second side wall 92. The claws 104, 106 can be spaced apart from each other and from the first side wall 90. The claws 104, 106 can interact with the second side wall 92 to define a passage 108 between them. The claws 98, 100 can be spaced apart from the claws 104, 106. As described in further detail below, the claws 98, 100, 104, 106 can be connected to the tool interface bar 72 of the tool holder 60 to hold the tool 62 on the tool holder 60. Referring again to Figs. 6 and 7, the claw 98 can include an inner stop surface 98a, an outer stop surface 98b, and an end face 98c, which is arranged at a distal end of the claw 98. The inner stop surface 98a and the outer stop surface 98b can be arranged on opposite sides of the claw 98 and extend between the first side wall 90 and the end face 98c. The claw 100 can include an inner stop surface 100a, an outer stop surface 100b (Fig. 7), and an end face 100c, which is arranged at a distal end of the claw 100. The inner stop surface 100a and the outer stop surface 100b can be arranged on opposite sides of the claw 100 and extend between the first side wall 90 and the end face 100c. A posterior surface 110 can be located at a distal end of the first side wall 90 and extend along the claws 98, 100.The first side wall 90 can enclose an inner surface 112 which extends to the support surface 96 next to the claws 98, 100. The claw 104 can include an inner stop surface 104a (Fig. 7), an outer stop surface 104b, and an end face 104c located at a distal end of the claw 104. The inner stop surface 104a and the outer stop surface 104b can be located on opposite sides of the claw 104 and extend between the second side wall 92 and the end face 104c. The claw 106 can include an inner stop surface 106a, an outer stop surface 106b (Fig. 7), and an end face 106c located at a distal end of the claw 106. The inner stop surface 106a and the outer stop surface 106b can be located on opposite sides of the claw 106 and extend between the second side wall 92 and the end face 106c. A posterior surface 114 can be located at a distal end of the second lateral wall 92 and extend along the claws 104, 106.The second side wall 92 can enclose an inner surface 116 which extends to the support surface 96 next to the claws 104, 106. As shown in Fig. 8, the claws 98, 100, 104, 106 can enclose the interface surfaces 98d, 100d, 104d, and 106d, respectively. The interface surface 98d of claw 98 can extend between the inner stop surface 98a, the outer stop surface 98b, the end face 98c, and the inner surface 112 of the first side wall 90. The interface surface 100d of claw 100 can extend between the inner stop surface 100a, the outer stop surface 100b, the end face 100c, and the inner surface 112 of the first side wall 90. The interface surface 104d of the claw 104 can extend between the inner stop surface 104a, the outer stop surface 104b, the end face 104c and the inner surface 116 of the second side wall 92. The interface surface 106d of the claw 106 can extend between the inner stop surface 106a, the outer stop surface 106b, the end face 106c and the inner surface 116 of the second side wall 92. Referring again to Figs. 6 and 7, the claws 98, 104 can be arranged at one end of the tool 62 (e.g., shown as an upper end) and the claws 100, 106 can be arranged at an opposite end of the tool 62 (e.g., shown as a lower end). Now, referring to Fig. 6, the interface surfaces 98d, 104d (Fig. 8) of the claws 98, 104 can be located next to and spaced apart from the main housing 76, such that a section of the first side wall 90 extends between the claw 98 and the main housing 76, and a section of the second side wall 92 extends between the claw 104 and the main housing 76. The interface surface 98d, the first side wall 90 and the main housing 76 can work together to define a receptacle 113 in between, and the interface surface 104d, the second side wall 92 and the main housing 76 can work together to define a receptacle 115 in between.Each of the receptacles 113, 115 can work together to provide an elongated groove between the claws 98, 104 and the main housing 76, extending through the top end of the tool 62 and enabling the top end to be installed on the tool holder 60. Now, with reference to Fig. 7, the interface surfaces 100d, 106d (Fig. 8) of the claws 100, 106 can be located adjacent to and spaced apart from the main housing 76, such that a section of the first side wall 90 extends between the claw 100 and the main housing 76, and a section of the second side wall 92 extends between the claw 106 and the main housing 76. The interface surface 100d, the first side wall 90, and the main housing 76 can interact to define a recess 117 between them, and the interface surface 106d, the second side wall 92, and the main housing 76 can interact to define a recess 119 between them. Each of the receptacles 117, 119 can work together to provide an elongated groove between the claws 100, 106 and the main housing 76, extending through the lower end of the tool 62 and enabling the lower end to be installed on the tool holder 60. Referring again to Fig. 6, the passage 82 can define a center line C1. The rear end 94 of the tool 62 can be vertically and horizontally symmetrical about the center line C1, so that the tool 62 can be installed on the tool holder 60 in two different orientations (e.g., optionally inverted). The center line C1 can, for example, be located on an imaginary vertical plane P1 and an imaginary horizontal plane P2. The imaginary vertical plane P1 and the imaginary horizontal plane P2 can be perpendicular to each other, so that the center line C1 is located on the imaginary vertical plane P1 and the imaginary horizontal plane P2 (e.g., at the intersection between them). The imaginary vertical plane P1 can divide the tool 62 vertically, and the imaginary horizontal plane P2 can divide the tool 62 horizontally.The rear end 94 of the tool 62 can be vertically symmetrical about the imaginary vertical plane P1, such that the arrangement and structure of the claws 98, 100 and the claws 104, 106 are effectively mirror images of each other. The rear end 94 of the tool 62 can be horizontally symmetrical about the imaginary horizontal plane P2, such that the arrangement and structure of the claws 98, 104 and the claws 100, 106 are effectively mirror images of each other. It is understood that, although each of the claws 98, 100, 104, 106 is depicted in a similar shape, in some embodiments one pair of diagonally opposite claws (e.g., claws 98, 106) may have the same shape and the other pair of diagonally opposite claws (e.g., claws 100, 104) may have the same shape, but the shapes of the corresponding diagonal pairs may be different. Claws 98, 106 could be cylindrical and claws 100, 104 could be triangular.In any case, in such embodiments, the tool 62 can still be installed in two different orientations, even if the corresponding shapes of the diagonal pairs are different. Now, with reference to Figs. 9, 10, 11 to 12, the tool interface beam 72 can include a left side 120 (Fig. 9), a right side 122 (Fig. 10), and a main section 124 that at least partially defines the passage 82. As shown in Fig. 9, the passage 82 can define a center line C2. The center line C2 can, for example, lie on an imaginary vertical plane P3 that extends along the main section and divides the tool interface beam 72 into the left and right sides 120 and 122. In order for the tool interface beam 72 to accommodate the mounting of the tool 62 in one of the orientations described above, the left and right sides 120 and 122 can be symmetrical about the imaginary vertical plane P3, so that they are essentially mirror images of each other. As shown in Figs. 9 and 10, the tool interface spar 72 can include a left upper claw support structure 126 and a left lower claw support structure 128, each extending laterally outward from the main section 124 on the left side 120 of the tool interface spar 72. The left upper and left lower claw support structures 126, 128 can be vertically spaced apart and interact with the main section 124 to define a left passage 130. As shown in Fig. 11 and Fig. 12, the tool interface spar 72 can include a right upper claw support structure 132 and a right lower claw support structure 134, which extend laterally outwards from the main section 124 on the right side 122 of the tool interface spar 72.The upper right and lower right claw support structures 132, 134 can be vertically spaced apart and interact with the main section 124 to define a right passage 136. The main section 124 can include a support surface 137 located at a front end 74 of the tool holder 60. As described in more detail below, the claw support structures 126, 128, 132, 134 can interact with the claws 98, 100, 104, 106 to enable the tool 62 to be attached to the tool holder 60. Referring again to Figs. 9 and 10, the left upper claw support structure 126 can include a left claw holder 140, a rear support 142, and a lower support 144. The left claw holder 140 can be arranged on a front side of the tool holder 60 and positioned in front of and spaced apart from the rear support 142, allowing the lower support 144 to extend between them. The left claw holder 140 and the rear and lower support 142, 144, can interact with the main section 124 to define a groove 146 for receiving one of the claws 100, 104. As shown in Fig. 9, the rear support 142 can include a rear surface 142a, and the lower holder 144 can include a lower surface 144a. As shown in Fig.As shown in Figure 10, the left claw support 140 can include an interface surface 140a extending upwards from the lower surface 144a in front of the rear and lower surfaces 142a, 144a. The interface surface 140a can be adjacent to and spaced apart from the rear surface 144a, and the lower surface 144a can extend between the interface surface and the rear surfaces 140a, 142a. The main section 124 can include an end surface 148 extending between the interface surface and the rear and lower surfaces 140a, 142a, 144a. The left lower claw support structure 128 can include a left claw holder 150, a rear support 152, and a lower support 154. The left claw holder 150 can be positioned on a front face of the tool holder 60 and arranged in front of and spaced apart from the rear support 152, allowing the lower support 154 to extend between them. The left claw holder 150 and the rear and lower support 152, 154 can interact with the main section 124 to define a groove 156 for receiving one of the claws 98, 106. As shown in Fig. 9, the rear support 152 can include a rear surface 152a, and the lower support 154 can include a lower surface 154a. As shown in Fig. 10, the left claw holder 150 can enclose an interface surface 150a extending upwards from the lower surface 154a in front of the rear and lower surfaces 152a, 154a.The interface surface 150a can be adjacent to and spaced apart from the rear surface 154a, and the lower surface 154a can extend between the interface surface and the rear surfaces 150a, 152a. The main section 124 can include an end surface 158 that extends between the interface surface, the rear surface, and the lower surface 150a, 152a, 154a. It is understood that the rear support parts 142, 152 are depicted as an integral part of the rear support part 152, so that any reference to the rear support parts 142, 152 or the rear surfaces 142a, 152a is also to be understood as referring generally to the rear section 68. The upper right and lower right claw support structures 132, 134 can be similar to the left and lower claw support structures 126, 128, except that they are provided on the right side 122 of the tool interface beam 72. Referring again to Figs. 11 and 12, the upper right claw support structure 132 can include a right claw holder 160, a rear support 162, and a lower support 164. The right claw holder 160 can be arranged on a front face of the tool holder 60 and positioned in front of and spaced apart from the rear support 162, allowing the lower support 164 to extend between them. The right claw holder 160 and the rear and lower support parts 162, 164 can interact with the main section 124 to define a groove 166 for receiving one of the claws 98, 106. As shown in Fig.As shown in Fig. 11, the rear support part 162 can enclose a rear surface 162a, and the lower support 164 can enclose a lower surface 164a. As shown in Fig. 10, the right claw support 160 can enclose an interface surface 160a extending upward from the lower surface 164a in front of the rear and lower surfaces 162a, 164a. The interface surface 160a can be adjacent to and spaced apart from the rear surface 164a, and the lower surface 164a can extend between the interface surface and the rear surfaces 160a, 162a. The main section 124 can enclose an end surface 168 extending between the interface surface and the rear and lower surfaces 160a, 162a, 164a. The right lower claw support structure 134 can include a right claw holder 170, a rear support 172, and a lower support 174. The right claw holder 170 can be arranged on a front face of the tool holder 60 and positioned in front of and spaced apart from the rear support 172, allowing the lower support 174 to extend between them. The right claw holder 170 and the rear and lower support 172, 174 can interact with the main section 124 to define a groove 176 for receiving one of the claws 100, 104. As shown in Fig. 11, the rear support 172 can include a rear surface 172a, and the lower support 174 can include a lower surface 174a. As shown in Fig. 12, the right claw holder 170 can enclose an interface surface 170a extending upwards from the lower surface 174a in front of the rear and lower surfaces 172a, 174a.The interface surface 170a can be adjacent to and spaced apart from the rear surface 174a, and the lower surface 174a can extend between the interface surface and the rear surfaces 170a, 172a. The main section 124 can include an end surface 178 that extends between the interface surface, the rear surface, and the lower surface 170a, 172a, 174a. It is understood that the rear support parts 162, 172 are depicted as an integral part of the rear section 68, so that any reference to the rear support parts 162, 172 or the rear surfaces 162a, 172a is also to be understood as referring generally to the rear section 68. Now, with reference to Figures 13, 14, 15 to 16, the installation of the tool 62 on the tool holder 60 is illustrated and will now be described. First, as shown in Figure 13, the tool 62 can be aligned with the claws 98, 104 over the claws 100, 106, so that the first and second side walls 90, 92 are arranged on the right and left sides 122, 120 of the tool interface bar 72, respectively, with the receptacles 117, 119 facing the right lower claw support structure 134 and the left lower claw support structure 128, respectively. Then, as shown in Figures 14, 15 to 16, the tool 62 can initially be mounted to the front of the tool interface bar 72. As shown in Fig. 15, the upper right claw support structure 132 can be arranged at least partially at the passage 102 of the tool 62 and the claw 100 can be arranged at least partially at the right passage 136 (Fig.11) and above the lower claw support structure 134 of the tool holder 60. As shown in Fig. 16, the upper left claw support structure 126 can be arranged at least partially at the passage 108 of the tool 62, and the claw 106 can be arranged at least partially at the left passage 130 (Fig. 9) and above the lower left claw support structure 128 of the tool holder 60. The passages 102, 108 of the tool 62 and the right and left passages 136, 130 of the tool holder 60 can allow the passage of the upper claw support structures 132, 126 and the claws 100, 106, respectively, to enable correct alignment of the tool 62 on the tool holder 60.When the tool 62 is aligned with the tool holder 60, the end faces 100c, 106c of the claws 100, 106 can run along the end faces 178, 158 of the main section 124, the front and lower support parts 150, 154 of the lower claw support structure 128 can run along the inner surface 116 of the second side wall 92, and the right claw support 170 and the lower support part 174 of the right lower claw support structure 134 can run along the inner surface 112 of the first side wall 90 to support correct alignment of the tool 62 with the tool holder 60. Then, as shown in Figs. 17, 18 to 19, the tool 62 can be pushed further onto the tool interface spar 72 until the support surfaces 96, 137 connect to each other. As shown in Figs. 18 and 19, the receptacles 117, 119 can be aligned on the right claw holder 170 and the left claw holder 150, respectively, the claws 98, 100 can be arranged over the grooves 166 and 176, respectively, and the claws 104, 106 can be arranged over the grooves 146, 156. Then, as shown in Fig. 20, Fig. 21 to Fig. 22, the tool 62 can be pushed downwards to insert the right claw holder 170 and the left claw holder 150 into the receptacles 117 and 119 respectively, until the claws 98, 100 are inserted into the upper and lower claw support structure 132, 134, and the claws 104, 106 are inserted into the upper and lower claw support structure 126, 128, so that the tool 62 is fully toothed with the tool interface spar 72.When the tool 62 is toothed with the tool holder 60, the interface surface, the rear and inner stop surfaces 104d, 114, 104a of the claw 104 can directly adjoin the interface surface, the rear and lower surfaces 140a, 142a, 144a of the left upper claw support structure 126 and, in some embodiments, touch it. The end face 104c of the claw 104 can directly adjoin and, in some embodiments, touch the end face 148 of the main section 124. The interface surface, the rear and inner stop surfaces 106d, 114, 106b of the claw 106 can lie directly against each other and, in some embodiments, touch the interface surface, the rear and lower surfaces 150a, 152a, 154a of the left lower claw support structure 128. The end face 106c of the claw 106 can directly adjoin and, in some embodiments, touch the end face 158 of the main section 124.The interface surface, the rear and the inner stop surface 98d, 110, 98a of the claw 98 can lie directly against each other and, in some embodiments, touch the interface surface, the rear and lower surfaces 160a, 162a and 164a respectively of the right upper claw support structure 132. The end face 98c of the claw 98 can be directly adjacent and, in some embodiments, touch the end face 168 of the main section 124. The interface surface, the rear and the inner stop surface 100d, 110, 100b of the claw 100 can lie directly against each other and, in some embodiments, touch the interface surface, the front, rear and lower surfaces 170a, 172a, 174a of the lower claw support structure 134. The end face 100c of the claw 100 can directly adjoin and, in some embodiments, touch the end face 178 of the main section 124.Once the tool 62 is toothed with the tool interface shank 72, the fastening element 86 can be installed through the passages 82, 84 to allow further fastening of the tool 62 to the tool holder 60 and thus complete the installation of the tool 62 on the tool holder 60. Now, with reference to Fig. 23, each support surface 96, 137 of the tool 62 and the tool holder 60 can be substantially arc-shaped between the upper and lower ends (viewed perpendicular to the imaginary vertical planes P1 and P3). The rear surfaces 110, 114 of the tool 62 and the rear surfaces 142a, 152a, 162a, 172a of the tool holder 60 can also be substantially arc-shaped. The arc-shaped surfaces can be complementary to each other and can have substantially similar radii of curvature. As such, the tool 62 can rotate easily when the claws 98, 100, 104, 106 are inserted into the upper and lower claw support structures 126, 128, 132, 134. In one embodiment, the radius of curvature of the tool 62 and the tool holder 60 can be between two inches and about six inches. When operating the rotatable drum assembly 36, the arc shape of the support surfaces 96, 137 allows the resulting force, which is passed from the starting material to the tool 62, to be distributed more evenly on the tool holder 60 than with conventional tool assembly arrangements. Additionally, the resulting force can be distributed more evenly from the starting material to the interface between the rear and inner stop surfaces 114, 104a of the claw 104 and the rear or lower surfaces 142a, 144a of the left upper claw support structure 126, between the rear and outer stop surfaces 114, 106b of the claw 106 and the rear or lower surfaces 152a, 154a of the left lower claw support structure 128, between the rear and inner stop surfaces 110, 98a of the claw 98 and the rear or lower surfaces 162a, 164a of the right upper claw support structure 132, and between the rear and outer stop surfaces 110, 100b of the claw 100 and the rear or lower surfaces 162a, 164a of the right upper claw support structure 132.The lower surfaces 172a, 174a of the right lower claw support structure 134 are distributed. As such, the tool assembly 40 can be less prone to damage and stronger than conventional arrangements, while using less material, which can be far more cost-effective and less time-consuming to manufacture. It is understood that the removal of the tool 62 from the tool holder 60 can be achieved by reversing the installation steps described above. In some embodiments, the tool 62 can be removed from the tool holder 60 and reinstalled in the tool holder 60 in an inverted orientation. In these embodiments, the tool 62 can be provided in an inverted orientation to allow the use of the other cutting blade 78 if the original cutting blade 78 is worn, damaged, or otherwise unsuitable for cutting. When the tool 62 is mounted on the tool holder 60 in an inverted orientation, the tool 62 can be aligned with the claws 100, 106 over the claws 98, 104, so that the first and second side walls 90, 92 must be arranged on the left and right sides 120, 122 of the tool interface bar 72, respectively.The installation of the tool 62 in this orientation can be similar to the installation procedure described above, except that the claws 98, 100 are connected to the left lower and upper claw support structures 128, 126 on the left side 120 of the tool interface spar 72, and the claws 104, 106 are connected to the right lower and upper claw support structures 134, 132 on the right side 122 of the tool interface spar 72. For example, if the tool 62 is initially mounted to the front of the tool interface spar 72, the upper left claw support structure 126 can be arranged at least partially at the passage 102 of the tool 62, and the claw 100 can be arranged at least partially at the left passage 130 (Fig.9) of the tool holder 60, the upper right claw support structure 132 can be arranged at least partially at the passage 108 of the tool 62 and the claw 106 can be arranged at least partially at the right passage 136 (Fig. 11). When the tool 62 is toothed with the tool interface shank 72, the front, rear, and inner stop surfaces 100d, 110, 100a of the claw 100 can lie directly against each other and, in some embodiments, contact the front, rear, and lower surfaces 140a, 142a, 144a of the left upper claw support structure 126, respectively. The end face 100c of the claw 100 can be directly adjacent and, in some embodiments, contact the end face 148 of the main section 124. The front, rear, and outer stop surfaces 98d, 110, 98b of the claw 98 can lie directly against each other and, in some embodiments, contact the front, rear, and outer surfaces 150a, 152a, and 154a of the left lower claw support structure 128, respectively. The end face 98c of the claw 98 can directly adjoin and, in some embodiments, touch the end face 158 of the main section 124.The front, rear, and inner stop surfaces 106d, 114, 106a of the claw 106 can lie directly against each other and, in some embodiments, touch the front, rear, and lower surfaces 160a, 162a, 164a of the right upper claw support structure 132, respectively. The end face 106c of the claw 106 can be directly adjacent and, in some embodiments, touch the end face 168 of the main section 124. The front, rear, and outer stop surfaces 104d, 114, 104b of the claw 104 can lie directly against each other and, in some embodiments, touch the front, rear, and lower surfaces 170a, 172a, 174a of the right lower claw support structure 134, respectively. The end face 104c of the claw 100 can directly adjoin and, in some embodiments, touch the end face 178 of the main section 124. Figures 24, 25 to 26 show an alternative embodiment of a tool assembly 1040, which is similar to or in many respects identical to the tool assembly 40 shown in Figures 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 to 23. For example, as shown in Figure 24, the tool assembly 1040 can include a tool holder 1060 and a tool 1062. As shown in Fig. 25, the tool holder 1060 can include a tool interface beam 1072, which includes a support surface 1137 and a plurality of rear surfaces 1142a, 1152a (two not shown). As shown in Fig. 26, the tool 1062 can include a first side wall 1090, a second side wall 1092, and a support surface 1096 extending between the first and second side walls 1090, 1092.Posterior surfaces 1110, 1114 can be located at the distal ends of the first and second side walls 1090, 1092, respectively. However, the support surfaces 1096, 1137 and the posterior surfaces 1110, 1114, 1142a, 1152a can be essentially flat (e.g., non-arc-shaped). Figures 27, 28 to 29 show an alternative embodiment of a tool assembly 2040, which is similar to or in many respects identical to the tool assembly 40 shown in Figures 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 to 23. For example, as shown in Figure 27, the tool assembly 2040 can include a tool holder 2060 and a tool 2062. As shown in Fig. 28, the tool holder 2060 can include an upper and lower claw support structure 2126, 2128 arranged on a left side 2120, and an upper and lower claw support structure 2132, 2134 arranged on a right side 2122. However, the claw support structures 2126, 2128, 2132, 2134 extend laterally inwards from the opposite side walls 2091, 2093. As shown in Fig.As shown in Figure 29, the tool 2062 can include claws 2098, 2100, 2104, 2106, which are connected to the claw support structures 2126, 2128, 2132, 2134 to enable the coupling of the tool 2062 to the tool holder 2060. The claws 2098, 2100, 2104, 2106 extend laterally outwards from a main section 2125 of the tool 2062. Fig. 30 shows another alternative embodiment of a tool assembly 3040, which is similar to or in many respects identical to the tool assembly 40 shown in Figs. 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 to 23. For example, the tool assembly 3040 can include a tool holder 3060 and a tool 3062. The tool 3062 can include a pair of cutting blades 3078, each having a leading edge 3079. However, the leading edges 3079 can be tapered (e.g. in a sword configuration). Fig. 31 shows yet another alternative embodiment of a tool assembly 4040, which is similar to or in many respects identical to the tool assembly 40 shown in Figs. 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 to 23. For example, the tool assembly 4040 can include a tool holder 4060 and a tool 4062. The tool 4062 can, however, include a carbide cutting edge 4081 attached to a main housing 4076. Figs. 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 to 42 show an alternative embodiment of a tool assembly 5040, which is similar or in many respects identical to the tool assembly 40 shown in Figs. 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22 to 23. For example, as shown in Figs. 32 and 33, the tool assembly 5040 can include a tool holder 5060 and a tool 5062. As shown in Fig. 33, the tool holder 5060 can include a base flange 5064 and a main housing 5066 extending upwards from the base flange 5064.The main housing 5066 can include a rear section 5068 located at a rear end 5070 of the tool holder 5060 and a tool interface spar 5072 located at a front end 5074 of the tool holder 5060 and extending from the rear section 5068. The tool 5062 can include a main housing 5076 and a pair of cutting blades 5078 located at a front end 5080 of the tool 5062. The main housings 5066 and 5076 can define corresponding passages 5082 and 5084 for receiving a fastener 5086. Now, with reference to Figs. 34 and 35, the tool 5062 can enclose a first side wall 5090 and a second side wall 5092, which are arranged at a rear end 5094 of the tool 5062. A pair of claws 5098, 5100 can extend from the first side wall 5090, and a pair of claws 5104, 5106 can extend from the second side wall 5092. The claws 5098, 5104 can be arranged at one end of the tool 5062 (e.g., shown as an upper end), and the claws 5100, 5106 can be arranged at an opposite end of the tool 5062 (e.g., shown as a lower end). As shown in Fig. 34, the claw 5098 can include an inner stop surface 5098a, an outer stop surface 5098b, an end face 5098c, and an interface surface 5098d. The claw 5100 can include an inner stop surface 5100a, an outer stop surface 5100b, an end face 5100c, and an interface surface 5100d. As shown in Fig.As shown in Figure 35, the claw 5104 can include an inner stop surface 5104a, an outer stop surface 5104b, an end surface 5104c, and an interface surface 5104d. The claw 5106 can include an inner stop surface 5106a, an outer stop surface 5106b, an end surface 5106c, and an interface surface 5106d. Now, with reference to Fig. 36, the interface surfaces 5098d, 5104d of the claws 5098, 5104 can be located next to and spaced apart from the main housing 5076, such that a section of the first side wall 5090 extends between the claw 5098 and the main housing 5076, and a section of the second side wall 5092 extends between the claw 5104 and the main housing 5076. An intermediate surface 5098e can extend between the interface surface 5098d and the main housing 5076 and can interact with the main housing 5076, the intermediate surface 5098d and the first side wall 5090 to define a receptacle 5113 next to the claw 5098. An intermediate surface 5104e can extend between the interface surface 5104d and the main housing 5076 and can interact with the main housing 5076, the intermediate surface 5104d and the second side wall 5092 to define a receptacle 5115 next to the claw 5104.Each of the receptacles 5113, 5115 can be arranged at the upper end of the tool 5062 to provide positions for receiving the claw holders from the tool holder 5060 when the tool 5062 is installed on the tool holder 5060, as described in further detail below. Referring again to Fig. 35, receptacles 5117, 5119 can be arranged at the lower end of the tool 5062 and be similar to the receptacles 5113, 5115 described above. For example, as shown in Fig. 35, receptacle 5117 can be located next to the claw 5100 and be defined by an intermediate surface 5100e, the interface surface 5100d, the main housing 5076, and the first side wall 5090. Receptacle 5119 can be located next to the claw 5106 and be defined by an intermediate surface 5106e, the interface surface 5106d, the main housing 5076, and the second side wall 5092. Referring again to Fig. 34, the passage 5082 can define a center line C1, which lies on an imaginary vertical plane P1 and an imaginary horizontal plane P2, both perpendicular to each other. The rear end 5094 of the tool 5062 can be vertically and horizontally symmetrical about the center line C1. The main housing 5076 can define an imaginary vertical plane P3, perpendicular to the center line C1 and extending through a section of a support surface 5096. Now, with reference to Fig. 37, the interface surface 5098d of the claw 5098 is shown angled away from the main housing 5076 towards the rear end 5070 and the upper end, such that the interface surface 5098d is at an oblique angle A1 relative to the imaginary vertical plane P3. The angle of the interface surface 5098d can effectively cause the receptacle 5113 to taper inwards as it extends away from the upper end of the tool 5062 (e.g., towards the center line C1). In one embodiment, the oblique angle A1 can be between approximately 40 degrees and 70 degrees, and in one example, approximately 55 degrees. As described in further detail below, adjusting the angle of the interface surface 5098d in this way can improve the distribution of the forces acting on the tool holder 5060 at the tool 5062. The interface surface 5098d is depicted as being essentially flat, making it relatively easy to measure the angle of the interface surface 5098d relative to the imaginary vertical plane P3. However, alternative embodiments are considered in which the interface surface 5098d need not be flat, for example, if the interface surface 5098d includes surface irregularities, contours, or other features that contribute to its non-flatness. In these embodiments, a representative flat surface for the non-planar interface surface 5098d can be approximated using a variety of suitable techniques. The representative flat surface can then be used to measure the angle of the non-planar interface surface 5098d relative to the imaginary vertical plane P3.In one example, the representative planar surface can be approximated using a regression plane modeling algorithm that samples various points along the non-planar interface surface 5098d and approximates the representative planar surface using regression analysis (e.g., least squares regression analysis) or other suitable analytical methods. It is understood that the measurement of the angle of any other surface described herein with respect to the imaginary vertical plane P3 (or any other imaginary plane or reference) can be understood as being obtained in a similar manner. The interface surface 5100d of the claw 5100 is shown angled away from the main housing 5076 and towards the rear end 5070 and the upper end, such that the interface surface 5100d is at an oblique angle A2 with respect to the imaginary vertical plane P3. The angle of the interface surface 5100d can effectively cause the receptacle 5117 to taper inwards as it extends away from the lower end of the tool 5062 (e.g., towards the centerline C1). In one embodiment, the oblique angle A2 can be between about 40 degrees and 70 degrees, and in one example, about 55 degrees. In another embodiment, the oblique angle of the interface surface 5100d can be essentially the same as the oblique angle of the interface surface 5098d. The respective claws 5098, 5100 are depicted extending towards the main housing 5076 and converging to form a monolithic structure projecting rearward from the main housing 5076 and inward from the first side wall 5090. The claws 5098, 5100, and more specifically the inner stop surfaces 5098a, 5100a, can interact to define a notch 5121 at the rear end 5070. The inner stop surfaces 5098a, 5100a can each be angled relative to each other and to the imaginary vertical plane P3, such that the notch 5121 is essentially V-shaped and tapers conically towards the front end 5080. In one embodiment, the oblique angle of the interface surfaces 5098a, 5100a can be essentially the same as the oblique angle of the interface surfaces 5098d and 5100d, respectively. It is understood that the claws 5106, 5104 can be configured similarly to the claws 5098 and 5100, respectively, but they can instead be positioned on the opposite side of the tool 5062 and as a mirror image of the claws 5098, 5100 (e.g., around the imaginary vertical plane P1 and / or the imaginary horizontal plane P2). As such, the corresponding angles of the interface surfaces 5106d, 5104d relative to the imaginary plane P3 can be similar to the angles of the interface surfaces 5098d, 5100d. The claws 5106, 5104 can also work together to define a notch 5123 (Fig. 35) via the inner stop surfaces 5106a, 5104a at the rear end 5070. Now, with reference to Figs. 38 and 39, the tool interface beam 5072 can include a left side 5120 (Fig. 38), a right side 5122 (Fig. 39), and a main section 5124 that at least partially defines the passage 5082. The main section 5124 can include a support surface 5137 located at a front end 5074 of the tool holder 5060. The passage 5082 can define a center line C2 that lies on an imaginary vertical plane P4 extending along the main section 5124 and dividing the tool interface beam 5072 into a left and a right side 5120, 5122. The left and right sides 5120, 5122 can be symmetrical about the imaginary vertical plane P4, so that they are essentially mirror images of each other about the imaginary vertical plane P4.The main section 5124 can define an imaginary vertical plane P5 that is perpendicular to the center line C2 and extends through a section of a support surface 5137. As shown in Fig. 38, the tool interface member 5072 can include a left lower claw support structure 5128, which includes a left claw holder 5150, a rear support 5152, and a lower support 5154. The left claw holder 5150 can be positioned in front of and spaced apart from the rear support 5152, allowing the lower support 5154 to extend between them. The left claw holder 5150 and the rear and lower support 5152 and 5154 can interact with the main section 5124 to define a groove 5156 for receiving one of the claws. The rear support 5152 can include a rear surface 5152a, and the lower support 5154 can include a lower surface 5154a. The left claw holder 5150 can include an interface surface 5150a extending upwards from the lower surface 5154a in front of the rear and lower surfaces 5152a, 5154a.The interface surface 5150a can be located next to and spaced away from the lower surface 5154a, and the lower surface 5154a can extend between the interface and the rear surface 5150a, 5152a. The interface surface 5150a of the left claw holder 5150 can be angled away from the main housing 5076 and towards a front end 5074 and an upper end, such that the interface surface 5150a has an oblique angle relative to the imaginary vertical plane P5. The oblique angle of the interface surface 5150a can effectively cause the groove 5156 to taper inwards as it runs towards a lower end of the tool holder 5060 (e.g., towards the base flange 5064 and away from the center line C2). The oblique angle of the interface surface 5150a can essentially coincide with the oblique angles of the interface surfaces 5098d, 5104d, so that when the tool 5062 is installed on the tool holder 5060 in any orientation, the interface surface 5150a can be perpendicular to each of the interface surfaces 5098d, 5104d (depending on the orientation of the tool 5062).As such, in one embodiment the oblique angle of the interface surface 5150a can be between about 40 degrees and 70 degrees, and in one example about 55 degrees. With further reference to Fig. 38, the tool interface member 5072 can include a left rear claw support 5125 extending forward from the rear section 5068 and laterally from the main section 5124, and located rearward on the left claw support 5150. The left rear claw support 5125 can have a similar shape to the notches 5121, 5123, so that when the tool 5062 is installed on the tool holder 5060 in any orientation, the left rear claw support 5125 can fit into one of the notches 5121, 5123 (depending on the orientation of the tool 5062). The left rear claw holder 5125 can include an upper interface surface 5125a and a lower interface surface 5125b which are angled relative to each other and to the imaginary vertical plane P5, such that the left rear claw holder 5125 is essentially V-shaped and tapers conically towards the front end 5080.The upper and lower interface surfaces 5125a, 5125b can have oblique angles relative to the imaginary vertical plane P5, which correspond to the oblique angles of the inner stop surfaces 5098a, 5100a of the notch 5121 and the oblique angles of the inner stop surfaces 5104a, 5106a of the notch 5123, so that when the tool 5062 is installed on the tool holder 5060 in any direction, the upper and lower interface surfaces 5125a, 5125b can be aligned with either of the inner stop surfaces 5098a, 5100a of the notch 5121 or the inner stop surfaces 5104a, 5106a of the notch 5123 (depending on the orientation of the tool 5062). As such, in one embodiment the oblique angle of the upper and lower interface surfaces 5125a, 5125b can be between about 40 degrees and 70 degrees and in one example about 55 degrees. As shown in Fig. 39, the tool interface member 5072 can include a right lower claw support structure 5134, which includes a right claw holder 5170, a rear support 5172, and a lower support 5174. The right claw holder 5170 can be positioned at and spaced apart from a front face of the rear support 5172, allowing the lower support 5174 to extend between them. The right claw holder 5170 and the rear and lower support 5172 and 5174 can interact with the main section 5124 to define a groove 5176 for receiving one of the claws. The rear support 5172 can include a rear surface 5172a, and the lower support 5174 can include a lower surface 5174a. The right claw holder 5170 can include an interface surface 5170a extending upwards from the lower surface 5174a in front of the rear and lower surfaces 5172a, 5174a.The interface surface 5170a can be located next to and spaced away from the rear surface 154a, and the lower surface 5174a can extend between the interface surface and the rear surface 5170a, 5172a. The interface surface 5170a of the right claw holder 5170 can be angled away from the main housing 5076 and towards a front end 5074 and an upper end, such that the interface surface 5170a has an oblique angle relative to the imaginary vertical plane P5. The oblique angle of the interface surface 5170a can effectively cause the groove 5176 to taper inwards as it runs towards the lower end of the tool holder 5060 (e.g., away from the center line C2). The oblique angle of the interface surface 5170a can essentially coincide with the oblique angles of the interface surfaces 5100d, 5106d, so that when the tool 5062 is installed on the tool holder 5060 in any orientation, the interface surface 5170a can be flush with each of the interface surfaces 5100d, 5106d (depending on the orientation of the tool 5062).As such, in one embodiment the oblique angle of the interface surface 5170a can be between about 40 degrees and 70 degrees, and in one example about 55 degrees. With further reference to Fig. 39, the tool interface member 5072 can include a right rear claw support 5127, which extends forward from the rear section 5068 and laterally from the main section 5124 and is located rearward on the right claw support 5170. The right rear claw support 5127 can have a similar shape to the notches 5121, 5123 (Fig. 34, Fig. 35) so that when the tool 5062 is installed on the tool holder 5060 in any orientation, the right rear claw support 5127 can fit into one of the notches 5121, 5123 (depending on the orientation of the tool 5062).The right rear claw holder 5127 can include an upper interface surface 5127a and a lower interface surface 5127b which are angled relative to each other and to the imaginary vertical plane P5, such that the right rear claw holder 5127 is essentially V-shaped and tapers conically towards the front end 5080.The upper and lower interface surfaces 5127a, 5127b can have oblique angles relative to the imaginary vertical plane P5, which correspond to the oblique angles of the inner stop surfaces 5098a, 5100a of the notch 5121 and the oblique angles of the inner stop surfaces 5104a, 5106a of the notch 5123, so that when the tool 5062 is installed on the tool holder 5060 in any direction, the upper and lower interface surfaces 5127a, 5127b can be aligned with each of the inner stop surfaces 5098a, 5100a of the notch 5121 or the inner stop surfaces 5104a, 5106a of the notch 5123 (depending on the orientation of the tool 5062). As such, in one embodiment the oblique angle of the upper and lower interface surfaces 5127a, 5127b can be between about 40 degrees and 70 degrees and in one example about 55 degrees. Now, with reference to Figs. 40, 41 to 42, the tool 5062 is shown such that it is installed on the tool holder 5060 in a first orientation to the jaws 5100, 5106 (not shown) or on the right and left lower jaw support structures 5134, 5128 (not shown). Figs. 41 and 42 are right and left cross-sectional views of Fig. 40, showing how the tool 5062 and the tool holder 5060 are connected to each other. As shown in Fig. 41, the claw 5100 can extend into the groove 5176, the right claw holder 5170 can extend into the receptacle 5117, and the right rear claw holder 5127 can extend into the notch 5121, so that the claw 5100 is effectively wedged between the right claw holder 5170 and the right rear claw holder 5127.Since the interface surface 5100d of the claw 5100 and the interface surface 5170a of the right claw support 5170 are provided at substantially the same oblique angle, the interface surface 5100d and the interface surface 5170a can be substantially perpendicular to each other. Similarly, since the inner stop surface 5100a of the claw 5100 and the lower interface surface 5127b of the right rear claw support 5127 are provided at substantially the same angle, the inner stop surface 5100a and the lower interface surface 5127b can be substantially perpendicular to each other. As shown in Fig. 42, the claw 5106 can extend into the groove 5156, the left claw holder 5150 can extend into the receptacle 5119, and the left rear claw holder 5125 can extend into the notch 5123, so that the claw 5106 is effectively wedged between the left claw holder 5150 and the left rear claw holder 5125. Since the interface surface 5106d of the claw 5106 and the interface surface 5150a of the left claw holder 5150 are provided at substantially the same oblique angle, the interface surfaces 5106d and 5150a can be substantially perpendicular to each other. Similarly, since the inner stop surface 5106a of the claw 5106 and the lower interface surface 5125b of the left rear claw holder 5125 are provided at essentially the same angle, the inner stop surface 5100a and the lower interface surface 5125b can be substantially perpendicular to each other.When the tool 5062 and the tool holder 5060 come into contact with material during the tillage operation (e.g. by rotation of the rotatable drum 38), a significant proportion of the force from the impact can be transmitted to the tool 5062 and the tool holder 5060 in general along the force curve F, as shown in Fig. 41 and Fig. 42. By providing the surfaces 5100d, 5100a, 5106d, 5106a of the claws 5100, 5106 in a straight line with the surfaces 5170a, 5127b, 5150a, 5125b of the tool holder 5060, the area of ​​the surface provided between the surfaces (e.g. 5100d and 5170a; 5100a and 5127b; 5106d and 5150a; 5106a and 5125b) can ensure that the force is distributed more evenly on the claws 5100, 5106 and the tool holder 5060 along the force curve F.The oblique angles of surfaces 5100d, 5170a, 5100a, 5127b, 5106d, 5150a, 5106a, 5125b can be selected to improve force distribution and, in some configurations, can be selected to be substantially perpendicular to the force distribution F. In one embodiment, the oblique angles of surfaces 5100d, 5170a, 5100a, 5127b, 5106d, 5150a, 5106a, 5125b can be between approximately 40 degrees and approximately 70 degrees, and in some examples, approximately 55 degrees. It is understood that in cases where surfaces 5100d, 5170a, 5100a, 5127b, 5106d, 5150a, 5106a, 5125b are not planar, adjacent surfaces that come into contact with each other (e.g., 5100d and 5170a) can be complementary to each other, so that the adjacent surfaces are still essentially perpendicular when they come into contact. It is also understood that the oblique angles of some of the adjacent pairs of surfaces (e.g.,5100d and 5170a; 5100a and 5127b; 5106d and 5150a; 5106a and 5125b) may differ from other adjacent pairs while maintaining the performance described herein. If the tool 5062 is no longer usable in the first orientation shown in Figs. 40, 41 to 42 (e.g., the upper cutting blade is worn), the tool 5062 can be removed from the tool holder 5060 and installed on the tool holder 5060 in a second (inverse) orientation. In the second orientation, the claws 5098, 5104 can be installed on the left and right lower claw support structures 5128, 5132, respectively, and can connect to the left and right lower claw support structures 5128, 5132 in a similar manner to that described above with regard to the claws 5100, 5106. Figures 43 to 44 show an alternative embodiment of a tool 6062, which is similar to or in many respects identical to the tool 5062 shown in Figures 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 to 42. For example, the tool 6062 can include first and second side walls 6090, 6092 extending from a main housing 6076. A pair of claws 6098, 6100 extends from the first side wall 6090 and a pair of claws 6104, 6106 extends from the second side wall 6092. The claws 6098, 6100, 6104, 6106 are spaced apart from the main housing 6076, so that a channel 6131 extends between the main housing 6076 and the claws 6098, 6100 (Fig. 43) and a channel 6133 extends between the main housing 6076 and the claws 6104, 6106 (Fig. 44). Figures 45 and 46 show an alternative embodiment of a tool 7062, which is similar to or in many respects identical to the tool 6040 shown in Figures 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 to 42. For example, the tool 7062 can include first and second side walls 7090, 7092 extending from a main housing 7076. A pair of claws 7098, 7100 extends from the first side wall 7090 and a pair of claws 7104, 7106 extends from the second side wall 7092. However, claws 7098, 7100 are spaced apart from the main body 7076 and claws 7104, 7106 are spaced apart from each other and from the main body 7076. Figures 47 and 48 show an alternative embodiment of a tool holder 7060, which is similar to or in many respects identical to the tool holder 5060 shown in Figures 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 to 42. The tool holder 7060 can, for example, include a left claw holder 7150 (Figure 47) and a right claw holder 7170 (Figure 48) extending laterally outwards from an interface beam 7072 on opposite sides. However, the tool holder 7060 can include an upper left claw holder 7140 (Fig. 47) and an upper right claw holder 7160 (Fig. 48) which extend laterally outwards from the interface spar 7072 on opposite sides, but which are vertically spaced from the left and right claw holders 7150 and 7170, respectively.The upper left and right claw holders 7140, 7160 can include interface surfaces 7140a, 7160a which are angled in a similar manner to the interface surfaces 7150a, 7170a of the left and right claw holders 7150, 7170. In this configuration, when the tool 7062, shown in Fig. 45 and Fig. 46, is installed on the tool holder 7060, the claw holders 7140, 7150, 7160, 7170 can be connected to the claws 7098, 7100, 7104, 7106 (depending on the positioning of the tool 7062) to hold the tool 7062 on the tool holder 7060. Fig. 49 shows yet another alternative embodiment of a tool assembly 8040, which is similar to or in many respects identical to the tool assembly 5040 shown in Figs. 32, 33, 34, 35, 36, 37, 38, 39, 40, 41 to 42. For example, the tool assembly 8040 can include a tool holder 8060 and a tool 8062. The tool 8062 can, however, include a carbide cutting edge 8081 attached to a main housing 8076. It should be noted that terms such as "specific," "preferably," "ordinarily," and "typically" are not used herein to limit the scope of the claimed invention or to imply that certain features are critical, essential, or even important to the structure or function of the claimed invention. On the contrary, these terms are intended only to highlight alternative or additional features that are or are not used in a particular embodiment of the invention. It should also be noted that terms such as "essentially" and "approximately" are used herein to represent the inherent degree of uncertainty associated with a quantitative comparison, value, measure, or other representation. The foregoing description of embodiments and examples is given for illustrative and descriptive purposes. It does not claim to be complete or limiting for the forms described. Numerous modifications are possible in light of the above teachings. Some of these modifications have been addressed, and others are easily understood by those skilled in the art. The embodiments have been chosen and described to illustrate various configurations. The scope is, of course, not limited to the examples or embodiments given herein, but can be applied by those skilled in the art to any number of applications and equivalent devices. On the contrary, it is hereby intended that the scope be defined by the claims attached herein.It is also understood for all claimed and / or described methods, regardless of whether the method is described in connection with a flowchart, that unless otherwise indicated or required by the context, any sequence of steps expressly or implicitly included that is followed in the execution of a method does not imply that these steps must be carried out in the order shown, but may be carried out in a different order or in parallel. QUOTES INCLUDED IN THE DESCRIPTION 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 US 4,168,757

[0007] US 4,209,071

[0007] US 4,148,366

[0009] US 5,813,792

[0009] US 2017 / 0079219 A1

[0012]

Claims

Tool for a rotating agricultural implement, the tool having a front end and a rear end and comprising: a main housing; at least one material engagement feature connected to the main housing and located at the front end; a first side wall extending from the main housing at the rear end; a second side wall extending from the main housing at the rear end and spaced apart from the first side wall; a first claw located at a lower end of the tool and extending from the first side wall to the second side wall, the first claw being spaced apart from the second side wall; and a second claw located at the lower end of the tool and extending from the second side wall to the first side wall, the second claw being spaced apart from the first side wall and the first claw;wherein: the first claw comprises a first interface surface adjacent to the main housing and interacts with the main housing to define at least a partial first receptacle extending through the lower end of the tool; the second claw comprises a second interface surface adjacent to the main housing and interacts with the main housing to define at least a partial second receptacle extending through the lower end of the tool; and the first receptacle and the second receptacle are configured to receive at least a section of a toolholder to enable the tool to be attached to the toolholder. Tool according to claim 1, further comprising: a first intermediate surface extending between the first interface surface and the main housing and further defining the first receptacle; and a second intermediate surface extending between the second interface surface and the main housing and further defining the second receptacle; and Tool according to claim 1, wherein: The first interface surface is angled away from the main surface, so that the first receptacle tapers conically away from the lower end; and the second interface surface is angled away from the main surface, so that the second receptacle tapers conically away from the lower end. Tool according to claim 3, wherein: The main housing defines a horizontal centerline extending between the front end and the rear end of the tool; the main housing defines an imaginary vertical plane perpendicular to the horizontal centerline; the first interface surface extends at a first oblique angle relative to the imaginary vertical plane; and the second interface surface extends at a second oblique angle relative to the imaginary vertical plane. Tool according to claim 4, wherein the first oblique angle and the second oblique angle are between about 40 degrees and about 70 degrees. Tool according to claim 5, wherein the first oblique angle and the second oblique angle are approximately 55 degrees. Tool according to claim 5, wherein the first oblique angle and the second oblique angle are essentially the same. Tool according to claim 4, wherein the main housing comprises a support surface arranged between the first side wall and the second side wall. Tool according to claim 8, wherein the support surface is arc-shaped in relation to the imaginary plane. The tool according to claim 1, further comprising: a third claw arranged at an upper end of the tool and extending from a third side wall to a fourth side wall, wherein the third claw is spaced apart from the fourth side wall; and a fourth claw arranged at the upper end of the tool and extending from the fourth side wall to the third side wall, wherein the fourth claw is spaced apart from the third side wall and the third claw; wherein: the third claw comprises a third interface surface adjacent to the main housing and interacts with the main housing to define at least a portion of a third receptacle extending through the upper end of the tool; the fourth claw comprises a fourth interface surface adjacent to the main housing and interacts with the main housing to define at least a portion of a fourth receptacle extending through the upper end of the tool;and the third and fourth receptacles are configured to accommodate at least one section of a tool holder to allow the tool to be attached to the tool holder. Tool according to claim 10, further comprising: A third intermediate surface extending between the third interface surface and the main housing and further defining the third receptacle; and a fourth intermediate surface extending between the third interface surface and the main housing and further defining the fourth receptacle. Tool according to claim 10, wherein: the first interface surface is angled away from the main surface, such that the first receptacle tapers conically away from the lower end; the second interface surface is angled away from the main surface, such that the second receptacle tapers conically away from the lower end; the third interface surface is angled away from the main surface, such that the third receptacle tapers conically away from the lower end; and the fourth interface surface is angled away from the main surface, such that the fourth receptacle tapers conically away from the lower end; Tool according to claim 12, wherein: The main housing defines a horizontal centerline extending between the front end and the rear end of the tool; the main housing defines an imaginary vertical plane perpendicular to the horizontal centerline; the first interface surface extends at a first oblique angle relative to the imaginary vertical plane; and the second interface surface extends at a second oblique angle relative to the imaginary vertical plane; the third interface surface extends at a third oblique angle relative to the imaginary vertical plane; and the fourth interface surface extends at a fourth oblique angle relative to the imaginary vertical plane. Tool according to claim 13, wherein the first, second, third and fourth oblique angles are between about 40 degrees and about 70 degrees. Tool according to claim 14, wherein the first, second, third and fourth oblique angles are approximately 55 degrees. Tool according to claim 14, wherein the first, second, third and fourth oblique angles are substantially the same. Tool according to claim 10, wherein: The center line is located on an imaginary horizontal plane that divides the main housing and is perpendicular to the imaginary vertical plane; and the first and second receptacles are arranged on one side of the imaginary horizontal plane and the third and fourth receptacles are arranged on an opposite side of the imaginary horizontal plane. Tool holder for a rotating agricultural implement, wherein the tool holder has a front end and a rear end, the tool holder comprising: a rear section at the rear end; and a tool interface spar located at the front end and extending from the rear section, the tool interface spar comprising: a main housing; a left claw support extending laterally outward from the main section on a left side of the tool interface spar; and a right claw support extending laterally outward from the main section on a right side of the tool interface spar, wherein: the left claw support comprises a left interface surface adjacent to the rear section and interacts with the rear section to define at least partially a left groove configured to receive the left claw of a tool;the right claw holder comprises a right interface surface adjacent to the rear section and interacts with the rear section to define at least partially a right groove configured to receive the right claw of a tool; and the rear section extends upwards in relation to the left claw holder and the right claw holder. Tool holder according to claim 18, further comprising: A left lower surface extending between the left interface surface and the rear section and further defining the left groove; and a right lower surface extending between the right interface surface and the rear section and further defining the right groove. Tool holder according to claim 18, wherein: The left interface surface is angled away from the rear section, so that the left groove tapers conically towards a lower end of the tool holder; and the right interface surface is angled away from the rear section, so that the right groove tapers conically towards the lower end of the tool holder. Tool holder according to claim 20, wherein: The rear section defines a horizontal center line extending between the front end and the rear end of the tool holder; the rear section defines an imaginary vertical plane perpendicular to the horizontal center line; the left interface surface extends at a first oblique angle relative to the imaginary vertical plane; and the right interface surface extends at a second oblique angle relative to the imaginary vertical plane. Tool holder according to claim 21, wherein the first oblique angle and the second oblique angle are between about 40 degrees and about 70 degrees. Tool holder according to claim 22, wherein the first oblique angle and the second oblique angle are approximately 55 degrees. Tool holder according to claim 22, wherein the first oblique angle and the second oblique angle are substantially the same. Tool holder according to claim 18, further comprising: a left rear claw holder extending laterally outwards from the main section on a left side of the tool interface spar rearward at the left claw holder; and a right rear claw holder extending laterally outwards from the main section on a right side of the tool interface spar rearward at the right claw holder. Tool holder according to claim 25, wherein: The left rear claw comprises an upper interface surface and a lower interface surface which are angled relative to each other; and the right rear claw comprises an upper interface surface and a lower interface surface which are angled relative to each other. Rotating agricultural implement comprising: A tool having a front end and a rear end, the tool comprising: Main housing; at least one material engagement feature connected to the main housing and located at the front end; a first side wall extending from the main housing at the rear end; a second side wall extending from the main housing at the rear end and spaced apart from the first side wall; a first claw located at a lower end of the tool and extending from the first side wall to the second side wall, the first claw being spaced apart from the second side wall; and a second claw located at the lower end of the tool and extending from the second side wall to the first side wall, the second claw being spaced apart from the first side wall and the first claw;a tool holder having a front end and a rear end, the tool holder comprising: a rear section at the rear end; and a tool interface shank located at the front end and extending from the rear section, the tool interface shank comprising: a main housing; a left claw support extending laterally outward from the main section on a left side of the tool interface shank; and a right claw support extending laterally outward from the main section on a right side of the tool interface shank, wherein: the first claw comprises a first interface surface adjacent to the main housing and interacts with the main housing to define at least partially a first receptacle extending through the lower end of the tool;the second claw comprises a second interface surface adjacent to the main body and interacts with the main body to define at least a partial second receptacle extending through the lower end of the tool; the left claw holder comprises a left interface surface adjacent to the rear section and interacts with the rear section to define at least a partial left groove configured to receive the left claw of a tool; the right claw holder comprises a right interface surface adjacent to the rear section and interacts with the rear section to define at least a partial right groove configured to receive the right claw of a tool; the rear section extends upward relative to the left claw holder and the right claw holder;and the first and second receptacles are configured to accommodate opposite left and right claw receptacles to allow the tool to be attached to the tool holder.

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