KNIFE SHARPENING TOOL The present innovation relates to a hand tool, and more particularly to a sharpening tool for grinding a blade of a cutting tool, such as a knife or the like. 5 A conventional grindstone is used to grind a blade of a cutting tool (such as a knife or the like) when the blade is worn or rusted. However, the grinding angle between the blade of the cutting tool and the grindstone cannot be controlled easily, thereby causing inconvenience to a user when grinding the blade of the cutting tool, and thereby decreasing the grinding effect of the 10 grindstone. A conventional knife sharpening tool comprises a support seat, and a grindstone mounted on the support seat to grind the blade of the cutting tool. However, the user has to hold the support seat by his one hand and to hold the cutting tool by his other hand when grinding the blade of the cutting tool, thereby causing inconvenience to the user when grinding the blade of the 15 cutting tool, and thereby easily causing danger to the user. In accordance with the present innovation, there is provided a knife sharpening tool, comprising a main base, a sucker mounted on the main base and attached to a surface to attach the main base to the surface, and a grinding unit mounted on the main base for grinding and finishing a blade of a cutting 20 tool. The main base has a first side and a second side. The main base has an opening defined between the first side and the second side of the main base.
The first side of the main base has a periphery formed with an outwardly extending press edge pressing a periphery of the sucker. The second side of the main base has a surface provided with a mounting seat. The mounting seat of the main base has an inner portion formed with an insertion hole. The grinding 5 unit is mounted on the mounting seat of the main base and is inserted into and partially protruded outward from the insertion hole of the mounting seat. The knife sharpening tool further comprises a cover mounted on the mounting seat of the main base to cover the opening of the main base. The cover has a surface provided with a ramp. The ramp of the cover has a side provided with an 10 auxiliary grindstone. The cover has an inner portion formed with a passage connected to the insertion hole of the mounting seat to allow passage of the grinding unit. The grinding unit is exposed and protruded outward from the passage of the cover. The first side of the main base has a surface formed with a 15 substantially hexagonal through hole connected to the opening of the main base. The sucker has a surface provided with a substantially hexagonal pull lever extended through the through hole of the main base into the opening of the main base. The pull lever of the sucker is movably mounted in the through hole of the main base. The knife sharpening tool further comprises a control 20 handle mounted on the sucker and abutting the main base to control movement of the sucker. The control handle is pivotally mounted in the opening of the main base and has a first portion formed with a pivot seat pivotally mounted on 2 the pull lever of the sucker and a second portion formed with a handlebar. The pivot seat of the control handle has a side formed with an eccentrically arranged press block pressing the first side of the main base. The grinding unit includes two laminating tapered grindstones. The 5 two grindstones of the grinding unit are juxtaposed to each other to form a grinding space to receive the blade of the cutting tool. The main base has a substantially L-shaped profile. The first side of the main base has an inner portion formed with a receiving space connected to the through hole of the main base to receive the sucker. The second side of the 10 main base is perpendicular to the first side of the main base. The knife sharpening tool further comprises an elastic member mounted on the pull lever of the sucker and biased between the main base and the sucker. The elastic member is received in the receiving space of the main base. The cover has a side provided with two opposite limit plates surrounding the passage of the 15 cover and the grinding unit to limit the grinding unit. The primary objective of the present innovation is to provide a knife sharpening tool that is operated easily and conveniently. According to the primary advantage of the present innovation, the knife sharpening tool is attached to a surface so that a user only needs to hold 20 the cutting tool to grind the blade, thereby facilitating the user grinding the blade of the cutting tool. 3 According to another advantage of the present innovation, the user only needs to hold the cutting tool by his one hand to grind the blade without having to hold the knife sharpening tool by his other hand, thereby preventing the user's hand from being injured by the blade of the cutting tool so as to 5 protect the user's safety. According to a further advantage of the present innovation, the knife sharpening tool can be directly attached to a horizontal surface or a vertical surface so that the knife sharpening tool is operated and stored easily and quickly, thereby facilitating the user operating the knife sharpening tool, and 10 thereby saving the space of storage of the knife sharpening tool. Further benefits and advantages of the present innovation will become apparent after a careful reading of the detailed description with appropriate reference to the accompanying drawings. In the drawings: 15 Fig. 1 is a perspective view of a knife sharpening tool in accordance with the preferred embodiment of the present innovation. Fig. 2 is an exploded perspective view of the knife sharpening tool as shown in Fig. 1. Fig. 3 is a front cross-sectional view of the knife sharpening tool as 20 shown in Fig. 1. Fig. 4 is a schematic operational view of the knife sharpening tool as shown in Fig. 3. 4 Fig. 5 is a schematic operational view of the knife sharpening tool as shown in Fig. 1. Fig. 6 is a schematic operational view of the knife sharpening tool as shown in Fig. 1. 5 Referring to the drawings and initially to Figs. 1-3, a knife sharpening tool in accordance with the preferred embodiment of the present innovation comprises a main base 30, a sucker 10 mounted on the main base 30 and attached to a surface 70 to attach the main base 30 to the surface 70, and a grinding unit 40 mounted on the main base 30 for grinding and finishing a 10 blade 74 (see Fig. 5) of a cutting tool 72, such as a knife or the like. The main base 30 has a substantially L-shaped profile and has a first side 36 and a second side 37. The main base 30 has an opening 32 defined between the first side 36 and the second side 37 of the main base 30. The first side 36 of the main base 30 has a surface formed with a substantially hexagonal 15 through hole 31 connected to the opening 32 of the main base 30. The first side 36 of the main base 30 has a periphery formed with an outwardly extending press edge 35 pressing a periphery of the sucker 10. The first side 36 of the main base 30 has an inner portion formed with a receiving space 38 connected to the through hole 31 of the main base 30 to receive the sucker 10. The second 20 side 37 of the main base 30 is perpendicular to the first side 36 of the main base 30 and has a surface provided with a mounting seat 33. The mounting seat 33 of the main base 30 has an inner portion formed with an insertion hole 34. 5 The grinding unit 40 is mounted on the mounting seat 33 of the main base 30 and is inserted into and partially protruded outward from the insertion hole 34 of the mounting seat 33. The grinding unit 40 includes two laminating tapered grindstones 42. The two grindstones 42 of the grinding unit 40 are 5 juxtaposed to each other to form a grinding space 43 to receive the blade 74 of the cutting tool 72. The sucker 10 has a vacuum suction force and has a surface provided with a substantially hexagonal pull lever 11 extended through the through hole 31 of the main base 30 into the opening 32 of the main base 30. The pull lever 10 11 of the sucker 10 is movably mounted in the through hole 31 of the main base 30. The knife sharpening tool further comprises an elastic member 20 mounted on the pull lever 11 of the sucker 10 and biased between the main base 30 and the sucker 10, a control handle 50 mounted on the sucker 10 and 15 abutting the main base 30 to control movement of the sucker 10, and a cover 60 mounted on the mounting seat 33 of the main base 30 to cover the opening 32 of the main base 30. The elastic member 20 is received in the receiving space 38 of the main base 30. The control handle 50 is pivotally mounted in the opening 32 of the 20 main base 30 and has a first portion formed with a pivot seat 51 pivotally mounted on the pull lever 11 of the sucker 10 and a second portion formed with a handlebar 53. The pivot seat 51 of the control handle 50 has a side formed 6 with an eccentrically arranged press block 52 pressing the first side 36 of the main base 30. The press block 52 of the control handle 50 is movable eccentrically relative to the main base 30 between a first position as shown in Fig. 3 where the press block 52 of the control handle 50 is spaced from the 5 main base 30 to release the sucker 10 and a second position as shown in Fig. 4 where the press block 52 of the control handle 50 presses the first side 36 of the main base 30 to lift the pull lever 11 of the sucker 10 so as to compress the sucker 10 by the press edge 35 of the main base 30. The cover 60 has an inner portion formed with a passage 61 10 connected to the insertion hole 34 of the mounting seat 33 to allow passage of the grinding unit 40, and the grinding unit 40 is exposed and protruded outward from the passage 61 of the cover 60. The cover 60 has a side provided with two opposite limit plates 62 surrounding the passage 61 of the cover 60 and the grinding unit 40 to limit the grinding unit 40. The cover 60 has a surface 15 provided with a ramp 63 abutting one of the two limit plates 62. The ramp 63 of the cover 60 has a side provided with an auxiliary grindstone 64. As shown in Fig. 3, the press block 52 of the control handle 50 is spaced from the main base 30 to release the sucker 10. As shown in Fig. 4, when the control handle 50 is pivoted on the pull 20 lever 11 of the sucker 10, the press block 52 of the control handle 50 is moved eccentrically to press the first side 36 of the main base 30 to lift the pull lever 11 of the sucker 10 so as to compress the sucker 10 by the press edge 35 of the 7 main base 30 to form a vacuum space between the sucker 10 and the surface 70 so as to attach the sucker 10 to the surface 70 so that the sucker 10 is bonded onto the surface 70 closely and exactly. As shown in Fig. 5, the sucker 10 is attached to a horizontal surface 5 (not shown), so that the blade 74 of the cutting tool 72 is ground by the grinding unit 40 in a horizontal manner. If the edge of the blade 74 produces burrs, the blade 74 of the cutting tool 72 can be placed on and ground by the auxiliary grindstone 64 of the cover 60 to remove the burrs on the edge of the blade 74. Then, the blade 74 of the cutting tool 72 can be placed on and ground 10 by the grinding unit 40. As shown in Fig. 6, the sucker 10 is attached to a vertical surface (not shown), so that the blade 74 of the cutting tool 72 is ground by the grinding unit 40 in a vertical manner. Accordingly, the knife sharpening tool is attached to a surface so that 15 a user only needs to hold the cutting tool 72 to grind the blade 74, thereby facilitating the user grinding the blade 74 of the cutting tool 72. In addition, the user only needs to hold the cutting tool 72 by his one hand to grind the blade 74 without having to hold the knife sharpening tool by his other hand, thereby preventing the user's hand from being injured by the blade 74 of the cutting 20 tool 72 so as to protect the user's safety. Further, the knife sharpening tool can be directly attached to a horizontal surface or a vertical surface so that the knife sharpening tool is operated and stored easily and quickly, thereby facilitating 8 the user operating the knife sharpening tool, and thereby saving the space of storage of the knife sharpening tool. The terms "comprise(s)" and "comprising" as used in the specification and claims mean "consisting at least in part of', that is to say 5 when interpreting statements in the specification and claims which include any of those terms, the features, prefaced by any of those terms in each statement, all need to be present but other features can also be present. Throughout the specification, unless the context requires otherwise, the word "comprise" or variations such as "comprises" or "comprising", will 10 be understood to imply the inclusion of a stated integer or group of integers but not the exclusion of any other integer or group of integers. Although the innovation has been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing 15 from the scope of the present innovation. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the innovation. 9