AU2011201638A1

AU2011201638A1 - Rechargeable callus remover

Info

Publication number: AU2011201638A1
Application number: AU2011201638A
Authority: AU
Inventors: Jae Hyun Song
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-09-10
Filing date: 2011-04-11
Publication date: 2012-03-29
Anticipated expiration: 2031-04-11
Also published as: TW201210561A; AU2011201638B2; KR20120026696A

Abstract

Disclosed herein is a rechargeable callus remover for removing calluses from a foot of a user. The callus remover includes a body, a battery, a gearbox, a motor, a head plate, a grinding plate, a guard ring and an end plate. The battery is provided in the body and charged by power supplied from a power supply jack. The gearbox includes an output shaft which is coupled to a collection plate. The collection plate collects calluses removed from the foot. The motor is connected to the gearbox and is controlled by manipulating a switch. The head plate is provided on the first end of the body and fastened to the gearbox. The grinding plate is fastened to a grinding plate support fitted to the collection plate. The grinding plate grinds calluses and removes the calluses from the foot. The guard ring prevents the removed calluses from scattering. [Fig. 21 39 3== 1000

Description

Australian Patents Act 1990 - Regulation 3.2 ORIGINAL COMPLETE SPECIFICATION STANDARD PATENT Invention Title Rechargeable callus remover The following statement is a full description of this invention, including the best method of performing it known to me/us: P/00/011 ; 1 fl) RECHARGEABLE CALLUS REMOVER BACKGROUND OF THE INVENTION 5 1. Field of the Invention The present invention relates generally to rechargeable callus removers for removing calluses which are mainly formed on the heels of users and, more particularly, to a rechargeable callus remover which smoothly grinds calluses which are formed 10 on the heel, the sole of the foot, the side portion of the foot or the toes of a user, and which remove the calluses without affecting other portions of the foot. 2. Description of the Related Art 15 Generally, when persons wear shoes and walk or stand, the feet come into contact with hard portions of the shoes for a long period of time. Thereby, the skin on portions of the feet becomes hard and callous layers are formed. Such callous layers become gradually thicker. In severe cases, the callous 20 layers may split. Splitting of the callous layers may cause pain. Furthermore, for example, when the feet are washed, water infiltrates the callous layers and remains therein, thus inducing infection due to their being permeated by bacteria. Manual callus removers have been mainly used to remove 25 such calluses from the feet of people. A user holds the handle of a manual callus remover using the hand and manually grinds calluses from the foot using a grinding plate which is provided on one or both sides of the main body of the remover. However, the manual callus remover forces the user to repeat the 5 grinding motion, thus causing physical fatigue of, for example, the wrist. Furthermore, because it is difficult to apply constant force to the remover, the operation of removing calluses may be ineffective. In addition, the manual callus remover is not provided with a separate guard. Hence, calluses 10 removed from the feet scatter in all directions which is unsanitary. Because the manual callus remover dose not have a separate cover, the appearance of the manual callus remover-is poor and as is the portability thereof. Meanwhile, as other callus removal methods, a razor has 15 been used, as has an electric callus remover which has on one end thereof a grindstone operated by a small battery. However, the razor is dangerous, and in addition, there is the probability of bacterial contamination, and the callus is not uniformly removed from the foot of a user. In the case of the 20 electric callus remover, the battery is rapidly consumed. Because a small motor is used, the output power is small. Moreover, the remnants of calluses removed from the foot scatter in all directions. The grindstone or grinding sand has poor grinding performance, so that calluses are removed from 25 the foot inefficiently. 2 SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping 5 in mind the above problems occurring in the prior art, and an object of the present invention is to provide a rechargeable callus remover which uses a rechargeable battery and a geared motor to increase the grinding force of a grinding plate, unlike, the conventional manual callus remover which removes 10 callus in such a way as to be reciprocated by only force of the hand of a user and unlike the conventional electric callus remover which uses a disposable battery of comparatively small power. Therefore, the grinding plate having grinding protrusions can cleanly remove calluses from the heel of the 15 foot of a user without causing pain to the user. Furthermore, the rechargeable callus remover can be washed with water. In order to accomplish the above object, in an aspect, the present invention provides a rechargeable callus remover for removing calluses from a foot of a user, including: a body 20 forming a grip of the callus remover; a battery provided in the body, the battery being charged by power supplied through electric wires from a power supply jack; a gearbox provided in a first end of the body, the gearbox comprising an output shaft having a semicircular cross-section, the output shaft 25 being coupled to a collection plate for collecting calluses 3 removed from the foot; a motor connected to the gearbox and supplied with power from the battery through electric wires, the motor being controlled by manipulating a motor control switch; a head plate provided on the first end of the body, the 5 head plate being fastened to the gearbox; a grinding plate fastened to a grinding plate support fitted into a hole of the collection plate, the grinding plate rotating in such a way as to remove calluses from the foot; a guard ring preventing the calluses removed from the foot by the grinding plate from being 10 scattered, the guard ring being provided with a guard ring support; and an end plate provided on a second end of the body, the end plate forming an end part of the callus remover. In another aspect, the present invention provides a rechargeable callus remover for removing calluses from a foot 15 of a user, including: a body forming a grip of the callus remover; a battery provided in the body, the battery being charged by power supplied through electric wires from a power supply jack; a gearbox provided in a first end of the body, the gearbox comprising an output shaft having a semicircular 20 cross-section, the output shaft being coupled to a collection plate for collecting calluses removed from the foot; a motor connected to the gearbox and supplied with power from the battery over electric wires, the motor being controlled by manipulating a motor control switch; a head plate provided on 25 the first end of the body, the head plate being fastened to the 4 gearbox; a grinding plate fastened to a grinding plate support fitted into a hole of the collection plate, the grinding plate rotating in such a way as to remove calluses from the foot; a guard ring preventing the calluses removed from the foot by the 5 grinding plate from scattering, the guard ring being provided with a guard ring support; a resistor provided adjacent to the battery to control a rotating speed of the motor; and an end plate provided on a second end of the body, the end plate forming an end part of the callus remover. 10 The rechargeable callus remover according to the present invention grinds calluses using the strong force and. rapid rotation of a geared motor, unlike the conventional manual callus remover which forces a user to conduct the grinding operation using his/her arm strength and thus causes physical 15 fatigue. Therefore, the time taken to remove calluses is markedly reduced. Moreover, the present invention is configured such that calluses removed from the foot of the user are collected in a collection plate, thus minimizing the scattering of calluses in all directions. In addition, the 20 body of the callus remover is covered with a cover, so that it has increased portability, and the grinding plate which comes into directly contact with the skin of the user can be prevented from becoming contaminated. Therefore, the present invention is very sanitary. Furthermore, the callus remover of 25 the present invention is rechargeable, thus being convenient. 5 Moreover, the callus remover has a waterproof structure, which can be easily washed using water. BRIEF DESCRIPTION OF THE DRAWINGS 5 The above and other objects, features and advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: 10 FIG. 1 is a front view of a rechargeable callus remover, according to an embodiment of the present invention; FIG. 2 is a sectional view taken along line A-A of FIG. 1; FIG. 3 is an exploded perspective view of a head part of the callus remover according to the present invention; 15 FIG. 4 is a perspective view of a body of the callus remover of the present invention; FIG. 5 is a perspective view of a motor and a head plate of the callus remover of the present invention; FIG. 6 is of side views showing the motor and the head 20 plate of the callus remover of the present invention; FIG. 7 is a rear perspective view of the head plate of the callus remover of the present invention; FIG. 8 is of views showing the coupling among the motor, a circuit board and the head plate of the callus remover of the 25 present invention; 6 FIG. 9 is a perspective view showing a second end of the body of the callus remover of the present invention; FIG. 10 is a perspective view showing an end plate of the callus remover of the present invention; 5 FIG. 11 is a perspective view showing a portion of the callus remover coupled with an end cover according to the present invention; FIG. 12 is of perspective views showing the assembly of the guard ring of the callus remover according to the present 10 invention; FIG. 13 is a perspective view of a head plate of a rechargeable callus remover, according to another embodiment of the present invention; FIG. 14 is of views showing the coupling of a collection 15 plate to an output shaft of a motor according to the present invention; FIG. 15 is of side views showing examples of grinding protrusions of the callus remover of the present invention; FIG. 16 is a side sectional view showing a portion of a 20 rechargeable callus remover, according to still another embodiment of the present invention; FIG. 17 is of views showing a battery and a resistor of the embodiment of FIG. 16; and FIG. 18 is a perspective view showing a portion of a 25 rechargeable callus remover, according to still another 7 embodiment of the present invention. DESCRIPTION OF THE PREFERRED EMBODIMENTS 5 Hereinafter, a rechargeable callus remover according to the present invention will be described in detail with reference to the attached drawings. FIG. 1 is a front view of a rechargeable callus remover, according to an embodiment of the present invention. As shown 10 in FIG. 1, the rechargeable callus remover 100 has a trumpet shape, the diameter of which is increased from one end to the other end thereof. Preferably, the shell of the callus remover 100 is made of a material such as plastic, etc. FIG. 2 is a sectional view taken along line A-A of FIG. 1. 15 The general construction of the rechargeable callus remover 100 of the present invention will be explained with reference to FIG. 2. As shown in FIG. 2, the rechargeable callus remover 100 includes a body 1, a head part 1000, a medial portion 2000 and 20 an end part 3000. The body 1 has a trumpet shape which allows a user to comfortably hold it. The head part 1000 includes a head plate 39 which is provided on a first end of the body 1. The medial portion 2000 includes a component board 16. The end part 3000 includes an end plate 9 which forms a second end of 25 the callus remover 100. 8 A gearbox 13 is located in the head part 1000. A motor 12 is integrally coupled to the gearbox 13. Terminals 15 having a positive pole and a negative pole extend from the motor 12. The terminals 15 are connected to the component board 16. A 5 plurality of components 18 are mounted to both sides of the component board 16. The components 18 include a resistor, a condenser, a microcomputer, an integrated circuit, a connector, . etc., which operate and control the rechargeable callus remover . 100 of the present invention. Furthermore, a control board 17 10' for controlling the motor 12 is provided on a right side of the motor 12. A switch 27 for turning on/off the motor 12 is mounted to the control board 17. The switch 27 is covered with a material, such as rubber or silicone, to provide insulation and waterproofness. The switch 27 has a contact terminal 28 15 and a contact point 29 which are made of conductive material, so that when the contact terminal 28 comes into contact with the contact point 29, the motor 12 runs. Furthermore, an LED (light emitting diode) 30 is mounted to the control board 17. The LED 30 indicates, by changing colors, the charging 20 condition of a battery 21, which will be explained later, and whether the motor 12 is running. Typically, when the battery 21 is being charged, it is indicated by green. A state in which the battery 21 is not being charged is indicated by red. In addition, a state in which the motor 12 is running is 25 indicated by blue. 9 The head part 1000 includes a head cover 2 which is coupled to the body 1 in such a way as to be locked to fastening protrusions 3 of the body 1, thus covering a grinding plate 5 of the callus remover 100. Spacing protrusions 31 are 5 provided on the head cover 2 to prevent the head cover 2 from becoming contaminated by coming into contact with the ground. The grinding plate 5 which is protected by the head cover 2 functions to grind calluses and remove them from the skin of the user. A plurality of passing holes 37 is formed in the 10 grinding plate 5 so that calluses removed from the skin by the grinding plate 5 pass through the passing holes 37. The grinding plate 5 is made of metal. As shown in FIG. 3, the grinding plate 5 has a circular metal net shape and is coupled to a grinding plate support 43. Therefore, a collection space 15 36 is formed by the grinding plate 5 and the grinding plate support 43. A collection plate 4 covers the collection space 36. A shaft hole 54 is formed through a central portion of the head plate 39. An output shaft 14 which protrudes from the gearbox 13 is inserted through the shaft hole 54. The 20 collection plate 4 is provided on the end of the output shaft 14. A magnet 38 is provided on the output shaft 14. Thus, the magnet 38 attracts the grinding plate 5 made of metal, so that when the callus remover is running, the grinding plate 5 is prevented from being removed from the callus remover. An angle 25 ring 35 is disposed in an angle ring depression (53; refer to 10 FIG. 7) to prevent water from entering the gearbox through a shaft flange (51; refer to FIG. 6) which is provided on the gearbox 13. The head plate 39 has motor fastening holes 44 into which 5 screws 33 for fastening the head plate 39 to the gearbox 13 are tightened, and plate holes 45 into which screws 33 for fastening the head plate 39 to the body 1 are tightened. Furthermore, the fastening protrusions 3 to which the head cover 2 is locked are provided on the head plate 3. A coupling 10 depression 40 into which a guard ring support 6 is coupled is formed in the head plate 3. In addition, an 0-ring seating groove (48; refer to FIG. 5) is formed around the circumferential outer surface of the head plate 39. An 0-ring 34 is seated into the 0-ring seating groove 48 to watertightly 15 seal space between the body 1 and the head plate 39. A guard ring 7 is made of flexible material, such as silicone or rubber. As shown in FIG. 5, a gearbox hole 49 is formed in the gearbox 13. Screws 32 are tightened into the respective gearbox holes 49 via the motor fastening holes 44 of the head 20 plate 39, thus fastening the head plate 39 to the gearbox 13. Furthermore, when the screws 33 are inserted into the head plate 39, a packing ring 84 is fitted over each screw 33 to ensure waterproof performance. Meanwhile, in the medial portion 2000 of the callus 25 remover 100, the component board 16 is electrically connected 11 to the control board 17 by a connector 19. The two terminals 15 of the motor 12 are fastened to the component board 16 by soldering 20. The battery 21 provides, over electric wires 22, power to the motor 12 connected to the component board 16. 5 Furthermore, in the end part 3000 of the callus remover 100, screw holes (83; refer to FIG. 10) are formed at predetermined positions through the end plate 9. Screws 24 pass through the respective screw holes 82 and are tightened into an end support 8, thus fastening a jack 10 to the end 10 support 8. An 0-ring groove 60 is formed around the circumferential outer surface of the end plate 9. An 0-ring 25 is inserted into the O-ring groove 60 to prevent water from entering the body 1. A jack hole (58; refer to FIG. 10) is formed through a central portion of the end plate 9 at a 15 position corresponding to the jack 10. An end cover 11 made of silicone or rubber covers the end plate 9. Particularly, a portion of the end cover 11 is inserted to a predetermined depth into the jack hole 58 to ensure waterproofness. A cover protrusion (61; refer to FIG. 11) protrudes from a portion of 20 the circumferential edge of the end cover 11 to the outside of the body 1, thus facilitating the operation of coupling the end cover 11 to the end part of the callus remover 100 or of removing it therefrom. When the screws 24 are tightened into the end plate 9, packing rings 83 are used to ensure 25 waterproofness. A sealing sticker 26 is attached to the 12 surface of the end plate 9 to form a double waterproof structure. FIG. 3 is an exploded perspective view of the head part 1000 of the callus remover according to the present invention. 5 The LED 30 enables the user to discern the operating condition of the callus remover with the naked eyes. As stated above, the spacing protrusions 31 are provided on the outer surface of the head cover 2 so that the head cover 2 is prevented from coming into direct contact with the ground, thus 10 preventing the head cover 2 from becoming contaminated. The guard ring 7 functions to prevent calluses removed from the skin by the grinding plate 5 from being scattered. The guard ring 7 is made of a flexible material, such as silicone or rubber. The guard ring 7 is fitted into a groove (not shown) 15 formed in the guard ring support 6. The guard ring support 6 is fastened to the coupling depression 40. As shown in the drawings, calluses which are removed by the grinding of the grinding plate 5 having the passing holes 37 are inserted into the collection space 36 of the collection plate 4 through the 20 passing holes 37. Thereby, calluses can be prevented from being scattered outside the callus remover. Referring to FIG. 3, collection plate 4, grinding plate support 43 coupled to the grinding plate 5, the guard ring support 6 coupled to the guard ring 7, and head cover 2 are coupled in order to the head plate 25 39 of the body 1. Stop protrusions 42 are provided at 13 predetermined positions on the grinding plate support 43. The stop protrusions 42 are inserted into corresponding holes 41 formed in the collection plate 4 to prevent the grinding plate support 43 from idling. 5 FIG. 4 is a perspective view of the body 1 of the callus remover 100 of the present invention. FIG. 5 is a perspective view of the motor 12 and the head plate 39 of the callus remover 100 of the present invention. FIG. 6 is of side views showing the motor 12 and the head plate 39 of the callus 10 remover 100 of the present invention. As shown in FIG. 4, a stepped portion 46 is formed in the first end of the body 1, so that the head plate 39 is seated onto the stepped portion 46 and is thus prevented from being excessively inserted into the body 1. Furthermore, body holes 15 47 are integrally formed in the body 1 when the body 1 is formed by injection molding. The screws 33 are tightened into the corresponding plate holes 45 and the corresponding body holes 47, thus fastening the head plate 39 to the body 1. A switch hole 85 and an LED hole 86 are formed in the body 1 so 20 that the switch 27 protrudes out of the body 1 through the switch hole 85 and the LED 30 is exposed through the LED hole 86. Gearbox holes 49 are formed in the gearbox 13 so that the screws 32 are tightened into the corresponding gearbox holes 25 via the motor fastening holes 44 of the head plate 39, thus 14 fastening the head plate 39 to the entire motor 12. The gearbox 13 is typically used to increase the torque of the motor 12. If high torque is not required, only the motor 12 may be directly connected to the head plate 39 without using 5 the gearbox 13. As such, although the gearbox 13 can be selectively used, it is desirable that the gearbox 13 be used. The coupling depression 40 is formed at a predetermined portion in the head plate 39. The guard ring support 6 is fastened to the coupling depression 40. The output shaft 14 which 10 protrudes from the central portion of the gearbox 13 passes through the shaft hole 54 which is formed through the central portion of the head plate 39. The collection plate 4 is coupled to the output shaft 14. As mentioned above, the collection plate 4 functions to store calluses that have been 15 removed from, for example, the heel of the user, etc. The grinding plate support 43 provided with the grinding plate 5 is coupled to the collection plate 4. Thus, calluses removed from the skin are collected in the collection space 36 of the collection plate 4 through the passing holes 37 formed through 20 the grinding plate 5. The grinding plate 5 is made of metal. Preferably, the grinding plate 5 is fastened to the grinding plate support 43 when the grinding plate support 43 is formed by an insert molding method. The head cover 2 is removably locked to the fastening protrusions 3 provided on the head 25 plate 39. When the screws 33 are tightened into the head plate 15 39, the packing ring 84 is fitted over each screw 33 to ensure waterproofness. In FIG. 5, the detailed construction of the motor 12 is not illustrated. The angle ring 35 is seated into the angle ring depression 53 to prevent water from entering the 5 gearbox 13 through the shaft flange 51 disposed in the gearbox 13. As shown in the sectional views of the head plate 39 of FIG. 6, an angle ring protrusion 50 may be provided on the angle ring 35 to make waterproof performance more reliable. The output shaft 14 has a semicircular cross-section such that 10 one side is planar. Hence, when the motor 12 rotates, the output shaft 14 which is coupled to the collection plate 4 and the grinding plate support 43 can be prevented from slipping relative to the grinding plate support 43. FIG. 7 is a rear perspective view of the head plate 39 of 15 the callus remover 100 of the present invention. As shown in FIG. 7, a plurality of positioning depressions 52 is formed in the head plate 39. The gearbox 13 is seated onto the positioning depressions 52 so that the gearbox 13 can be prevented from undesirably moving to the left or the right 20 of the correct installation position. Furthermore, the angle ring depression 53 into which the angle ring 35 is seated is formed in the head plate 39. The angle ring 35 which is seated into the angle ring depression 53 prevents water from entering the gearbox 13, for example, when washing the callus remover 25 using water. As shown in FIG. 6, a fine gap is formed between 16 the angle ring 35 and the output shaft 14 to prevent contact between the angle ring 35 and the output shaft 14 from causing noise when the output shaft 14 rotates under the influence of the running motor 12. In this case, even if a minute amount of 5 water should enter the gearbox 13 along the surface of the output shaft 14, because a large amount of lubricant is present in the gearbox 13 and the gearbox 13 is tightly coupled to the motor 12, water seldom enters the motor 12. Moreover, as mentioned above, it is desirable that the angle ring protrusion 10 50 be provided on the circumferential inner surface of the angle ring 35 to more reliably prevent water from entering the motor 12. However, in this case, when the motor 12 is running, contact between the output shaft 14 and the angle ring protrusion 50 may cause noise. 15 FIG. 8 is of views showing the coupling among the motor 12, the circuit board 17 and the head plate 39 of the callus remover 100 of the present invention. Referring to FIGS. 1 and 8, the control board 17 is disposed on the circumferential outer surface of the motor 12 20 and extends to a position adjacent to the gearbox 13. A slight space 55 is formed between the control board 17 and the gearbox 13. The end of the control board 17 is disposed inside an edge 80 of the switch 27. As shown in FIG. 1, the edge 80 of the switch 27 is inserted into the space 55 between the control 25 board 17 and the gearbox 13 so that the switch 27 is prevented 17 from moving to the left or the right. The switch 27 is fitted into the switch hole 85 and the LED hole 86 which are formed in the body 1. In addition, the switch 27 is covered with material, such as rubber or silicone, for waterproofness. 5 FIG. 9 is a perspective view showing the second end of the body 1 of the callus remover 100 of the present invention. Referring to FIG. 9, the end support 8 is integrally provided in the second end of the body 1. The end support 8 has a jack support block 56 and screw holes 81. Furthermore, a 10 notch 57 is formed in the end support 8 so that electric wires 23 which extends from the component board 16 is connected to the jack 10 through the notch 57. FIG. 10 is a perspective view showing the end plate 9 of the callus remover 100 of the present invention. FIG. 11 is a 15 perspective view showing a portion of the callus remover 100 coupled with the end cover 11 according to the present invention; Referring to FIGS. 10 and 11, the end plate 9 has the 0 ring groove 60 into which the O-ring 25 is inserted for 20 waterproofness, the screw holes 82 through which the screws 24 pass, and the jack hole 58. The end cover 11 made of silicone or rubber covers the end plate 9. Particularly, a portion of the end cover 11 is inserted into the jack hole 58 to a predetermined depth to ensure waterproof performance. In 25 addition, a semicircular notch 59 is formed in a predetermined 18 portion of the edge of the end plate 9. A coupling protrusion which is provided on the circumferential outer edge of the end cover 11 is fitted into the semicircular notch 59, thus preventing the end cover 11 from undesirably separating from 5 the end plate 9. Furthermore, as shown in FIG. 11, the end cover has on the edge thereof the cover protrusion 61 to facilitate the operation of coupling the end cover 11 to end plate 9 or removing it therefrom. FIG. 12 is of perspective views showing the assembly of 10 the guard ring of the callus remover according to the present invention. As shown in FIG. 12, protrusions 62 are provided around the outer surface of the guard ring support 6, and holes are formed in the guard ring 7 at positions corresponding to the 15 protrusions 62. The guard ring 7 is fastened to the guard ring support 6 in such a way as to insert the protrusions 62 into the holes of the guard ring 7. Thereafter, an annular retainer 63 is fitted over the protrusions 62 so that the guard ring 7 is more reliably prevented from separating from the guard ring 20 support 6. The guard ring 7 is made of flexible material, such as silicone or rubber. The guard ring support 6 is fitted into the coupling depression 40 of the head plate 39. The guard ring 7 may be coupled to the guard ring support 6 only by force-fitting. Furthermore, adhesive may be applied between 25 the guard ring support 6 and the guard ring 7, or, 19 alternatively, after the guard ring 7 is fitted over the guard ring support 6, these may be fixed to each other by ultrasonic fusion. FIG. 13 is a perspective view of a head plate 39 of a 5 rechargeable callus remover, according to another embodiment of the present invention, illustrating adjustment of the height of a guard ring 7. In this embodiment, an insert slot 64, circumferential slots 65 and locking holes 66 are formed in the circumferential outer surface of the head plate 39. A locking 10 protrusion 67 is provided on the circumferential inner surface of the guard ring support 6. Thus, the locking protrusion 67 of the guard ring support 6 is inserted into the insert slot 64 of the head plate 39, is moved to a desired distance, and then is turned along the selected circumferential slot 65 in the 15 circumferential direction such that the locking protrusion 67 is locked to the corresponding locking hole 66. Here, the guard ring 7 can be adjusted in various heights depending on the number of circumferential slots 65 and locking holes 66. FIG. 14 is of views showing the coupling of the collection 20 plate 4 to the output shaft 14. As shown in FIG. 14, a shaft hole 68 is formed in the rear surface of the collection plate 4 so that the output shaft 14 protruding from the gearbox 13 of the motor 12 can be fitted into the shaft hole 68. If the output shaft 14 is inserted too 25 deeply into the shaft hole 68, the magnet 38 may be separated 20 from the collection plate 4 by the output shaft 14 (refer to the middle views of FIG. 14). Therefore, a stopper 69 is integrally provided at a predetermined position in the collection plate 4 so that an appropriate space 70 is formed 5 between the output shaft 14 and the magnet 38. Thus, even if excessive force is applied to the output shaft 14 or/and the collection plate 4 when the output shaft 14 is fitted into the shaft hole 68, the magnet 38 can be prevented from separating away from the collection plate 4 due to the pushing force of 10 the output shaft 14. Referring to FIG. 15, the grinding plate 5 is made *of metal. Grinding protrusions 79 having triangular shapes are provided on the surface of the grinding plate 5 to enhance the callus removal effect. As the edge of the grinding protrusion 15 79 is sharper, the callus removal effect is increased. Therefore, it is preferable that the grinding protrusions 79 comprise grinding protrusions 79-2 or 79-4, the sidewalls of which are concave so that the edges thereof become sharper. FIG. 16 is a side sectional view showing a portion of a 20 rechargeable callus remover, according to still another embodiment of the present invention. FIG. 17 is of views showing a battery and a resistor of the embodiment of FIG. 16. The gearbox 13 is firmly fastened to the motor 12. The output shaft 14 protrudes from the central portion of the 25 gearbox 13. The component board 16 is connected to the control 21 board 17 by the connector 19. The electric wires 23 for supplying power of the battery 21 to the motor 12 are connected to the component board 16. The control board 17 includes the LED 30 and a slide switch 71. The circuit structure is simpler 5 than that of the above-mentioned embodiments. In this embodiment, power is directly supplied from the battery 21 to the motor 12. Turning the power on/off and the rpm of the motor 12 are controlled by manipulating the slide switch 71. The slide switch 71 includes a switch rod 72. The switch rod 10 72 is inserted into a connection part 74 of a slide button 73. The slide button 73 is made of flexible material, such as rubber or silicone. The switch rod 72 of the slide switch 71 is moved by pushing or pulling the connection part 74 of the slide button 73. Thereby, turning the motor on/off or the rpm 15 of the motor 12 are controlled. For example, the slide switch 71 has three contact points (not shown). One contact point is for a turn off state, and another contact point is for a low speed operating state. In the low speed operation state, power of the battery 21 is supplied to the motor 12 via a resistor 20 76. Preferably, the resistor 76 comprises a cement resistor which can withstand high power. However, the resistor 76 is not limited to this kind. That is, any resistor may be used as the resistor 76, so long as it can withstand high power. The final contact point is related to a high speed operating state. 25 In this state, power is directly supplied from the battery 21 22 to the motor 12 without passing through the resistor 76. The battery 21 is connected to a connector 77 so that the supply or interruption of power is determined using a circuit according to the operation of the slide switch 71. 5 Portions of the callus remover which are not shown in FIG. 16 are the same as those of the above-mentioned embodiments, therefore further explanations will be also omitted. The connectors 19 and 77, the electric wires 23, a capacitor 78, etc. are mounted to the component board 16. The slide switch 10 71, the slide button 73, the LED 30, etc. are connected to the control board 17. In this embodiment, although the slide switch 71 has been illustrated as being used as the switch, various kinds of switches, for example, a push switch, a toggle switch, a tact switch, an SMD switch, a rotary switch, etc., 15 can be used as the switch. As shown in FIG. 17, the battery 21 is enclosed by a protective layer 75 which prevents the battery 21 from being scratched or contaminated. The resistor 76 preferably comprises a cement resistor and has a semicircular shape such that it, along with the battery 21, can be installed 20 in the body 1 having a cylindrical shape. The third view of FIG. 17 shows a sectional view of the body 1 in which the battery 21 and the cement resistor 76 are installed. FIG. 18 is a perspective view showing a portion of a rechargeable callus remover, according to still another 25 embodiment of the present invention. In this embodiment, a 23 body 200 of the callus remover has an hourglass shape which is increased in diameter from the medial portion to both ends thereof. If the body 200 having the hourglass shape is formed by injection molding, thin putting lines are unavoidably formed 5 at opposite sides on the outer surface of the body 200 which is what happens when two injection-molded substances are attached to each other; this deteriorates the appearance. To improve this, at least two longitudinal slits 201 are formed in the opposite sides of the outer surface of the body 200, as shown 10 in FIG. 18. In the case of the body 200, because the diameter thereof is increased from the medial portion to both ends, the body 200 can be prevented from slipping from the hand of the user when it is being used. Furthermore, if a separate mount holder is used, the callus remover can be easily and stably 15 placed onto the mount holder. Each longitudinal slit 201 may have the same depth and width along the longitudinal direction of the body 200 or, alternatively, the depth and width thereof may vary depending on the position. Hereinafter, the operation of the rechargeable callus 20 remover according to the present invention will be described in detail. The motor 12 is operated by manipulating the switch 27 provided on the outer surface of the body 1. Then, the gearbox 13 integrated with the motor 12 is operated by the operation of 25 the motor 12. Thereby, the output shaft 14 connected to the 24 gearbox 13 rotates. Furthermore, the rotating speed of the output shaft 14 can be controlled by varying the rpm of the motor 12 by manipulating the switch 27. For this, the various components mounted to the component board 16 are configured 5 such that they are organically combined and are controllable based on a circuit. Depending on the circumference, only the motor 12 may be provided without the gearbox 13 being used. Typically, the motor 12 is provided with a rotating shaft. When the output shaft 14 is rotated when the motor 12 runs, the 10 collection plate 4 coupled to the output shaft 14 also rotates. Then, the grinding plate support 43 along with the collection plate 4 rotates, because the stop protrusions 42 of the grinding plate support 43 are fitted into the holes 41 of the collection plate 4. Ultimately, the grinding plate 5 rotates 15 because this has been coupled to the grinding plate support 43 by the insert molding process. The grinding protrusions 79 are provided on the entire surface of the grinding plate 5. Thus, when the grinding plate 5 rotates, the grinding protrusions 79 remove calluses from the skin of, for example, the foot, of the 20 user. The removed calluses are collected in the collection space 36 formed in the collection plate 4 via the passing holes 37 formed in the grinding plate 5. Furthermore, because the magnet 38 is provided in the collection plate 4 and attracts the metal grinding plate 5, the grinding plate support 43 25 provided with the grinding plate 5 is prevented from being 25 removed from the body 1 even when the grinding plate 5 rotates. Furthermore, because the output shaft 14 is made of metal, the collection plate 4 can be more reliably prevented from being removed from the output shaft 14 when it rotates. As stated 5 above with reference to FIG. 15, the grinding protrusion 79 has the triangular shape and, preferably, it comprises the grinding protrusion 79-2 or 79-4 that has sidewalls that are concave so that the edges thereof become sharper. This further enhances the callus removal effect. Meanwhile, the fastening 10 protrusions 3 and the coupling depression 40 are formed in the head plate 39 provided on the first end of the body 1. The guard ring support 6 provided with the guard ring 7 made of flexible material, such as silicone or rubber, is coupled to the coupling depression 40. The guard ring 7 functions to 15 prevent calluses removed from the skin by the grinding plate 5 from scattering in all directions. In other words, calluses removed from the skin of, for example, the foot, of the user are collected in the collection space 36 of the collection plate 4 or in the guard ring 7. As such, because removed 20 calluses can be collected in the predetermined space, the work of removing calluses can become sanitary. Furthermore, the rechargeable callus remover 100 of the present invention has the waterproof function, so that the surface of the head plate 39, the collection plate 4, the grinding plate support 43, the 25 grinding plate 5, the guard ring support 6 and the guard ring 7 26 can be easily washed using running water. In addition, after the callus remover 100 has finished being used, the head part is covered with the head cover 2 in such a way as to fit the head cover 2 to the fastening protrusions 3 provided on the 5 surface of the head plate 39. Meanwhile, when the switch 27 is pushed, the conductive contact terminal 28 provided in the switch 27 comes into contact with the contact point 29. At this time, power is transmitted to the motor 12 through the circuit. Thereby, the motor 12 is operated. The LED 30 10 provided on the control board 17 indicates the operating conditions of the callus remover 100 or the charging condition of the battery 21 by changing colors. To charge the battery 21, the plug of a battery charger (not shown) which is widely used in home is connected to the jack 10. Then, predetermined 15 currents go over the electric wires 23 and charge the battery 21. Depending on the charging conditions of the battery 21, the color of the LED 30 changes. Generally, the battery 21 being charged is indicated by green. A state in which the battery 21 is not being charged is indicated by red. In 20 addition, a state in which the motor 12 is being operated is indicated by blue. The circuit structure for this can be formed by combination of various components provided on the component board 16 and the control board 17, and those skilled in the art will easily realize this circuit structure. After 25 the battery 21 has finished charging, the body is tightly 27 closed using the end cover 11 to prevent dust or the like from entering the body 1. The operating method and charging method of the embodiment using the cement resistor are similar to those of the other 5 embodiments. It is desirable that the switch used in the present invention comprise the slide switch 71, but the present invention is not limited to this. For example, a push switch may be used. In addition, the operating method and charging method of the rechargeable callus remover including the body 10 200 having the longitudinal slit 201 are also almost the same as those of the other embodiments, therefore further explanation is deemed unnecessary. As described above, a rechargeable callus remover according to the present invention can solve the problems of 15 the conventional manual callus remover which forces a user to conduct the grinding operation using his/her arm strength and thus causes physical fatigue. Furthermore, because the rapid rotation and strong force of a motor are used, the time it takes to remove calluses from the skin of, for example, the 20 foot, is markedly shortened. Moreover, the present invention is configured such that calluses removed from the skin are collected in a collection plate, thus minimizing the scattering of calluses in all directions. In addition, the body of the callus remover is covered with a cover, so that portability is 25 increased, and the grinding plate which comes into direct 28 contact with the skin of the user can be prevented from being contaminated; therefore, the present invention is very sanitary. Furthermore, the callus remover of the present invention is rechargeable, thus being convenient. Moreover, 5 the callus remover has a waterproof structure, which can be easily washed using running water. Although the preferred embodiments of the rechargeable callus remover according to the present invention have been disclosed for illustrative purposes, those skilled in the art 10 will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, it must be understood that the above mentioned embodiments are only a representative example, and do 15 not limit the present invention. Furthermore, it is to be interpreted that various modifications, additions and substitutions, which can be derived from the meaning, scope and equivalent concepts of the accompanying claims, fall within the bounds of the present invention. 20 Throughout this specification and the claims which follow, unless the context requires otherwise, the word "comprise", and variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated integer or step or group of integers or steps but not the exclusion of any 25 other integer or step or group of integers or steps. 29 The reference in this specification to any prior publication (or information derived from it), or to any matter which is known, is not, and should not be taken as, an acknowledgement or admission or any form of suggestion that 5 that prior publication (or information derived from it) or known matter forms part of the common general knowledge in the field of endeavour to which this specification relates. 30

Claims

1. A rechargeable callus remover for removing calluses from a foot of a user, comprising: a body forming a grip of the callus remover; a battery provided in the body, the battery being charged by power supplied through electric wires from a power supply jack; a gearbox provided in a first end of the body, the gearbox comprising an output shaft having a semicircular cross section, the output shaft being coupled to a collection plate for collecting calluses removed from the foot; a motor connected to the gearbox and supplied with power from the battery through electric wires, the motor being controlled by manipulating a motor control switch; a head plate provided on the first end of the body, the head plate being fastened to the gearbox; a grinding plate fastened to a grinding plate support fitted into a hole of the collection plate, the grinding plate rotating in such a way as to remove calluses from the foot; a guard ring preventing the calluses removed from the foot by the grinding plate from being scattered, the guard ring being provided with a guard ring support; and an end plate provided on a second end of the body, the end plate forming an end part of the callus remover. 31

2. The rechargeable callus remover as set forth in claim 1, further comprising: an angle ring provided in an angle ring depression formed in a rear surface of the head plate to prevent water from entering the gearbox through a shaft flange formed on the gearbox, the angle ring surrounding a circumferential outer surface of the output shaft such that a gap is formed between the shaft and the angle ring.

3. The rechargeable callus remover as set forth in claim 2, wherein an angle ring protrusion is provided on a circumferential inner surface of the angle ring, the angle ring protrusion being in contact with the circumferential outer surface of the output shaft of the motor to prevent water from entering the gearbox.

4. The rechargeable callus remover as set forth in claim 1, further comprising: a component board connected to a base end of the motor; and a control board provided on a portion of a sidewall of the motor. 32

5. The rechargeable callus remover as set forth in claim 4, wherein the component board is connected to a positive terminal and a negative terminal of the motor.

6. The rechargeable callus remover as set forth in claim 1, further comprising: an end support supporting the power supply jack, the end support being open on one end thereof.

7. The rechargeable callus remover as set forth in claim 4, wherein the grinding plate has a plurality of passing holes so that the calluses removed from the foot by the grinding plate passes through the passing holes and then is collected in a collection space formed in the collection plate.

8. The rechargeable callus remover as set forth in claim 1, wherein a magnet is provided on an outer end of the output shaft, and the grinding plate is made of metal, so that the magnet attracts the grinding plate using attractive force, thus preventing the grinding plate provided with the grinding plate support from being removed from the callus remover.

9. The rechargeable callus remover as set forth in claim 1, wherein a shaft hole is formed in a rear surface of the collection plate so that the output shaft protruding from the 33 gearbox of the motor is fitted into the shaft hole, and a stopper is integrally provided at a predetermined position in the collection plate such that a predetermined space is formed between the output shaft and the magnet.

10. The rechargeable callus remover as set forth in claim 4, wherein the motor control switch is covered with rubber or silicone material and is mounted to the control board to turn on/of f the motor, the switch comprising a contact terminal and a contact point which are made of conductive material, so that when the contact terminal comes into contact with the contact point, the motor runs, and an LED (light emitting diode) is mounted to the control board, the LED indicating, using changing colors, a charging condition of the battery and whether the motor is running.

11. The rechargeable callus remover as set forth in claim 6, further comprising: a head cover coupled to the body in such a way as to be locked to fastening protrusions provided on a corresponding surface of the head plate, thus covering the grinding plate, wherein an 0-ring groove is formed around a circumferential outer surface of the end plate, and an 0-ring is inserted into the O-ring groove to prevent water from entering the body, and 34 a jack hole is formed in a central portion of the end plate, the jack hole having a shape corresponding to the power supply jack, and an end cover made of silicone or rubber covers the end plate such that a portion of the end cover is inserted into the jack hole to a predetermined depth to increase waterproof performance.

12. The rechargeable callus remover as set forth in claim 1, wherein an 0-ring seating groove is formed around a circumferential outer surface of the head plate, and an 0-ring is seated into the O-ring seating groove.

13. The rechargeable callus remover as set forth in claim 1, wherein an insert slot, circumferential slots and locking holes are formed in the circumferential outer surface of the head plate, and a locking protrusion is provided at a predetermined position on a circumferential inner surface of the guard ring support.

14. The rechargeable callus remover as set forth in claim 11, wherein a plurality of spacing protrusions is provided on a top surface of the cover.

15. The rechargeable callus remover as set forth in claim 1, wherein the grinding plate has a plurality of grinding 35 protrusions, an edge of each of the grinding protrusions being angled at 900 or less.

16. The rechargeable callus remover as set forth in claim 1, wherein the body has a trumpet shape which increases in diameter from one end to the other end thereof, or a shape which increases in diameter from a medial portion to the opposite ends thereof.

17. The rechargeable callus remover as set forth in claim 1, wherein the guard ring is made of flexible material, such as rubber or silicone.

18. The rechargeable callus remover as set forth in claim 1, wherein at least one longitudinal slit is formed in a portion of the circumferential outer surface of the body.

19. A rechargeable callus remover for removing calluses from a foot of a user, comprising: a body forming a grip of the callus remover; a battery provided in the body, the battery being charged by power supplied through electric wires from a power supply jack; a gearbox provided in a first end of the body, the gearbox comprising an output shaft having a semicircular cross 36 section, the output shaft being coupled to a collection plate for collecting calluses removed from the foot; a motor connected to the gearbox and supplied with power from the battery over electric wires, the motor being controlled by manipulating a motor control switch; a head plate provided on the first end of the body, the head plate being fastened to the gearbox; a grinding plate fastened to a grinding plate support fitted into a hole of the collection plate, the grinding plate rotating in such a way as to remove calluses from the foot; a guard ring preventing the calluses removed from the foot by the grinding plate from scattering, the guard ring being provided with a guard ring support; a resistor provided adjacent to the battery to control a rotating speed of the motor; and an end plate provided on a second end of the body, the end plate forming an end part of the callus remover.

20. The rechargeable callus remover as set forth in claim 19, wherein the resistor comprises a cement resistor or a resistor for high electric power.

21. The rechargeable callus remover as set forth in claim 19, wherein the resistor has a semicircular or semicircular like cross-section so that the resistor along with the battery 37 is installed in the body.

22. The rechargeable callus remover as set forth in claim 19, wherein the motor control switch comprises a slide switch, a push switch, a toggle switch, a tact switch, an SMD switch or a rotary switch, and the switch switches the motor between a turn-off state, a low speed operating state and a high speed operating state.

23. A rechargeable callus remover for removing calluses from a foot of a user, comprising: a body forming a grip of the callus remover; a battery to be charged by power supplied through electric wires from a power supply jack; a motor supplied with power from the battery by electric wires, the motor being controlled by manipulating a motor control switch; a head plate provided on a first end of the body, the head plate being coupled to the motor; a grinding plate fastened to a grinding plate support fitted into a hole of a collection plate, the grinding plate rotating in such a way as to remove calluses from the foot; a guard ring preventing the calluses removed from the foot by the grinding plate from scattering, the guard ring being provided with a guard ring support; and 38 an end plate forming an end part of the callus remover.

24. A rechargeable callus remover, substantially as described with reference to the drawings and/or examples. 39