BACKGROUND OF THE INVENTION 0001 The present invention relates to a pepper grinding tool, which has an inner grinding part turnable relative to an outer grinding part to grind pepper in between, and particularly to one, of which the inner grinding part has one-way movement such that pepper can be ground relatively smoothly. 0002 Referring to FIGS. 7 and 8, a conventional pepper grinding tool, with British Patent No. 2256378, has a pressing block 10, a toothed bar 20, a gear wheel 30, a gear cluster 301, a shaft 40, an inner grinding part 50 and an outer grinding part 60. 0003 The pressing block 10 is depressable to move the toothed bar 20 downwards; when the pressing block 10 is released, the toothed bar 20 is biased up by an elastic member. The gear wheel 30 is connected to the toothed bar 20 and the gear cluster 301. The shaft 40 is connected to the gear cluster 301 and the inner grinding part 50 such that when the toothed bar 20 is moved up and down, the inner grinding part 50 can be turned by means of the gear wheel 30, the gear cluster 301 and the shaft 40. 0004 The inner grinding part 50 is disposed in the outer grinding part 60 which is fixedly disposed in the pepper grinding tool. 0005 Thus, the inner grinding part 50 can turn relative to the inner grinding part 60 to grind pepper in between. 0006 However, the pepper grinding tool is found to have a disadvantage that the inner grinding part 50 turns in one direction when the pressing block 10 is depressed, and the other direction when the pressing block is released, making the grinding movement not relatively smooth, especially when there are big pepper granule between the grinding parts 50, 60.

SUMMARY OF THE INVENTION 0007 Therefore, it is a main object of the present invention to provide a pepper grinding tool, of which the inner grinding part can turn relative to the outer grinding part in only one direction to make a relatively smooth grinding movement. 0008 The pepper grinding tool of the present invention includes a housing member, a grinding assembly and a one-way member. 0009 The housing member has an operation lever pivotably connected with it. 0010 The grinding assembly has an inner grinding part and an outer grinding part. The outer part is fixedly received in the housing member. The inner part is turnable relative to the outer part to grind pepper in between. 0011 The one-way member is received in the housing member, and has a tunable main body in the housing. The main body has a central round hole, and several curved slots around the central round hole; the curved slots each ha an engaging end portion in open communication with the central round hole. The curved slots each receives an engaging block biased towards the engaging end portion by a spring. 0012 When the main body of the one-way member is turned in a first direction by means of pressing the operation lever, the engaging blocks will be moved to the engaging end portions to engage a ring fitted in the central round hole, making the ring turn together with the main body. Thus, the inner grinding part associated with the ring can turn to grind pepper. 0013 The main body is turned back in an opposite direction by a torsional spring connected to it when the operation lever is released, not able to make the ring and the inner grinding part turn because the engaging blocks are moved away from the engaging end portions, and don't engage the ring any longer. Therefore, the inner grinding part can only be turned in the first direction to grind pepper.

BRIEF DESCRIPTION OF THE DRAWINGS 0014 This invention will be better understood by referring to the accompanying drawings, wherein: 0015 FIG. 1 is an exploded perspective view of a one-way pepper grinding tool of the present invention. 0016 FIG. 2 is a cross-sectional view of the one-way pepper grinding tool of the present invention. 0017 FIG. 3 is an exploded perspective view of the one-way member of the pepper grinding tool of the present invention. 0018 FIG. 4 is a top view of the one-way member of the pepper grinding tool according to the present invention. 0019 FIG. 5 is a view of the one-way pepper grinding tool of the present invention under operation. 0020 FIG. 6 is a top view of the one-way member of the pepper grinding tool being turned in a counterclockwise direction. 0021 FIG. 7 is a cross-sectional view of the conventional pepper grinding tool in the Background. 0022 FIG. 8 is a cross-sectional view of the conventional pepper grinding tool under operation.

DESCRIPTION OF THE PREFERRED EMBODIMENT 0023 Referring to FIGS. 1, 2, 3 and 4, a one-way pepper grinding tool of the present invention includes a housing member 1, a shaft 2, an inner grinding part 3, an outer grinding part 4, an one-way member 5, an operation lever 6, a string 61 and a torsional spring 612. 0024 The housing member 1 has a left part 11 and a right part 12 forming a receiving room for the grinding parts 3, 4, the one-way member 5, the torsional spring 612, etc when combined. 0025 The shaft 2 has a polygonal cross-section, and is connected to the inner grinding part 3 from a lower end portion. The inner grinding part 3 is turnably received in the outer grinding part 4 such that pepper can be ground in between when the inner grinding part 3 is turned. 0026 The one-way member 5 has a round main body 51, a ring 52, a central round hole 511 and several curved slots 53 on a recessed portion of the main body 51, and a covering part 54. The round main body 51 is turnably received in the housing member 1. An upper end portion of the shaft 2 is passed through the round hole 511 of the main body 5 1. 0027 The curved slots 53 each has an engaging end portion 531 and an engaging block 532 and a spring 533 received therein. The engaging end portions 531 each has an open inner portion in open communication with the central round hole 511 of the main body 51. Referring to FIG. 4, the engaging blocks 532 are each pushed into a respective one of the engaging end portions 531 by means of the spring 533. 0028 The ring 52 has a hole 521 having a polygonal shape same as the polygonal cross-section of the shaft 2. The ring 52 is turnably received in the central round hole 511 of the one-way member 5, and abuts the engaging blocks 532 located in the engaging end portions 531 of the curved slots 53. 0029 The covering part 54 has a central hole (not numbered) and a bottom protrusion 541. The covering part 54 is fitted onto the main body 51 with the bottom protrusion 541 secured in the recessed portion of the main body 51 to protect the engaging blocks 532 and the springs 533 from falling out. A nut 22 is connected to an upper threaded end portion 21 of the shaft 2. 0030 The torsional spring 612 is connected to both the main body 51 of the one-way member 5 and an inner side of the housing member 1 for permitting the spring 612 to bias the main body 51 back to an original position after same is turned. 0031 The operation lever 6 is pivoted to the housing member I from an intermediate position. Referring specifically to FIG. 5, the string 611 is connected to an upper end of the operation lever 6 from one end, and connected to a lower part 512 of the main body 51 from the other end such that the main body 51 of the one-way member can be turned clockwise and counterclockwise by means of pressing, and releasing a lower portion of the operation lever 6; the torsional spring 612 for forcing the main body 51 to turn in a direction opposite the other direction of the main body 51 when the operation lever 6 is depressed. 0032 In using the one-way pepper grinding tool to grinding pepper, referring to FIGS. 4, 5 and 6, when the operation lever 6 is depressed from the lower portion, the string 61 is pulled, forcing the main body 51 of the one-way member 5 to turn clockwise (FIG. 4); the engaging blocks 532, being received in the engaging end portions 531 of the curved slots 53, and abutting the ring 52, will make the ring 52 turn together with the main body 51. Thus, the shaft 2 connected to the ring 52 turns for permitting the inner grinding part 3 to turn relative to the outer grinding part to grind pepper in between 0033 When the operation lever 6 is released, the torsional spring 612 will force the main body 51 to turn counterclockwise, making the engaging blocks 532 separate from the engaging end portions 531, and the springs 533 compressed (FIG. 6). Thus, the engaging blocks 532 no longer engage the ring 52, i.e. the ring 52 won't turn when the main body 51 is turned counterclockwise. So, the inner grinding part 3 won't turn counterclockwise in the pepper grinding operation. 0034 When the operation lever 6 is depressed again, the engaging blocks 532 will move back to the engaging end portions 531 and engage the ring 52 for permitting the ring 52 and the inner grinding part 3 to turn. 0035 From the above description, the one-way pepper grinding tool of the present invention can be known to have desirable features as follows. 0036 1. Having one-way movement, the inner grinding part can have a relatively smooth movement in the pepper grinding operation. 0037 2. The one-way pepper grinding tool can provide a stepless movement for the inner grinding part, while the conventional pepper grinding tool in the Background.