WO2005118235A1 - Cutting blade assembly of rotary drum type electric razor - Google Patents

Cutting blade assembly of rotary drum type electric razor Download PDF

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Publication number
WO2005118235A1
WO2005118235A1 PCT/KR2004/002184 KR2004002184W WO2005118235A1 WO 2005118235 A1 WO2005118235 A1 WO 2005118235A1 KR 2004002184 W KR2004002184 W KR 2004002184W WO 2005118235 A1 WO2005118235 A1 WO 2005118235A1
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WO
WIPO (PCT)
Prior art keywords
cutting
cutting blade
blades
members
cutting blades
Prior art date
Application number
PCT/KR2004/002184
Other languages
French (fr)
Inventor
Tae Jun Oh
Original Assignee
Tae Jun Oh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tae Jun Oh filed Critical Tae Jun Oh
Publication of WO2005118235A1 publication Critical patent/WO2005118235A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/14—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the rotary-cutter type; Cutting heads therefor; Cutters therefor
    • B26B19/16—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers of the rotary-cutter type; Cutting heads therefor; Cutters therefor involving a knife cylinder or a knife cone or separate cutting elements moved like a rotating cylinder or a rotating cone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26B—HAND-HELD CUTTING TOOLS NOT OTHERWISE PROVIDED FOR
    • B26B19/00—Clippers or shavers operating with a plurality of cutting edges, e.g. hair clippers, dry shavers
    • B26B19/38—Details of, or accessories for, hair clippers, or dry shavers, e.g. housings, casings, grips, guards
    • B26B19/3846—Blades; Cutters

Definitions

  • the present invention relates to a cutting blade assembly of a rotary drum type electric razor, and more particularly to a cutting blade assembly of a rotary drum type electric razor comprising a plurality of cutting blades rotatable in a safety cover of the rotary drum type electric razor wherein each of the cutting blades is made by means of a pressing process to obtain a plurality of cutting members bent from a blade body of each pressed cutting blade along bending lines formed at the cutting blade, respectively, and the cutting blades are securely fitted on a rotary shaft, whereby the manufacturing process of the cutting blade assembly is simplified, and thus the manufacturing cost of the cutting blade assembly is reduced.
  • a rotary drum type electric razor generally comprises: a razor body 1; a motor 2 mounted in the razor body 1, especially on a central axis of the razor body 1 ; a power transmission unit (not shown) to transmit a rotary force of the motor to a driving shaft 4 of a cutting blade assembly 3; and a safety cover 5 disposed above the blade assembly 3 for protecting the cutting blade assembly 3.
  • the cutting blade assembly 3 comprises a plurality of spiral cutting blades 7 formed on the outer circumference of a cylindrical body 6, which is made of metal. The cutting operation is performed between the spiral cutting blades 7 and the safety cover 5.
  • the driving shaft 4 is inserted through the center of the cylindrical body 6. To both ends of the driving shaft 4 are securely fixed driven gears (not shown), respectively, to which power is transmitted from the power transmission unit.
  • the cutting blades 7 are integrally formed at the outer circumference of the metal cylindrical body 6, which is made by means of insert injection. Also, additional SUS blades are securely attached to the outer circumference of the cylindrical body 6 so that the SUS blades can perform a cutting operation together with the cutting blades 7.
  • the cutting blades are integrally formed at the outer circumference of the cylindrical body made by means of the insert injection so that the cutting blades perform a cutting operation together with the above-mentioned additional SUS blades.
  • each of the cutting blades does not have a cutting angle with the result that the cutting efficiency is lowered.
  • each of the cutting blades has a short length with the result that hair is caught between the cutting blades after shaving.
  • the cutting blade assembly comprises: a rotary shaft made of a circular steel bar, the rotary shaft being provided at both ends thereof with driving gears, to which power is transmitted from a power transmission unit; and a plurality of cutting blades each formed in the shape of a polygon, each of the cutting blades being provided at the center thereof with a fitting hole, which is formed by means of a burring process such that the cutting blades are forcibly fitted on the rotary shaft, each of the cutting blades having a plurality of cutting members formed on the outer circumference thereof while being uniformly spaced apart from each other, each of the cutting members being twisted at a predetermined twist angle ⁇ each of the cutting members being provided at one edge thereof with a cutting part having a predetermined cutting angle ⁇ ,the cutting blades being securely fitted on the middle part of the rotary shaft.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide a cutting blade assembly of a rotary drum type electric razor comprising a plurality of cutting blades made by means of a pressing process to obtain a plurality of cutting members bent from a blade body of each pressed cutting blade along bending lines formed at the cutting blade, respectively, and the cutting blades are securely fitted on a rotary shaft, whereby the manufacturing process of the cutting blade assembly is simplified, and thus the manufacturing cost of the cutting blade assembly is reduced.
  • a cutting blade assembly of a rotary drum type electric razor the cutting blade assembly being rotatably mounted to the upper end of a razor body of the rotary drum type electric razor for performing a cutting operation through the use of a rotating force of a motor mounted in the razor body, the cutting operation being carried out between the cutting blade assembly and a safety cover
  • the cutting blade assembly comprising: a rotary shaft made of a circular steel bar, the rotary shaft being provided at both ends thereof with driving gears, to which power is transmitted from a power transmission unit; and a plurality of cutting blades each formed in the shape of a polygon, each of the cutting blades being provided at the center thereof with a fitting hole, which is formed by means of a burring process such that the cutting blades are forcibly fitted on the rotary shaft, the cutting blades being securely fitted on a middle part of the rotary shaft, wherein: each of the cutting blades has a plurality of cutting members integral
  • the cutting members formed at the outer circumference of the blade body of each of the cutting blades, are spaced approximately 30 to 45 degrees from each other about the fitting hole.
  • FIG. 1 is a view showing the structure of a general rotary drum type electric razor
  • FIG. 2 is a perspective view showing a cutting blade assembly of a conventional rotary drum type electric razor
  • FIG. 3 is a view showing a cutting blade of a rotary drum type electric razor according to a first preferred embodiment of the present invention, the cutting blade being made by means of a pressing process
  • FIG. 4 is a perspective view of the cutting blade according to the first preferred embodiment of the present invention shown in FIG. 3 illustrating a plurality of cutting members bent from a blade body of the pressed cutting blade along bending lines formed at the cutting blade, respectively
  • FIG. 5 is a perspective view of a cutting blade assembly according to a first preferred embodiment of the present invention, the cutting blade assembly comprising a plurality of cutting blades, each of which is shown in FIG.
  • FIG. 6 is a front view of the cutting blade according to the first preferred embodiment shown in FIG. 4;
  • FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6;
  • FIG. 8 is a perspective view showing a cutting blade of a rotary drum type electric razor according to a second preferred embodiment of the present invention
  • FIG. 9 is a front view of the cutting blade according to the second preferred emb odiment of the present invention shown in FIG. 8
  • FIG. 10 is a cross-sectional view taken along line B-B of FIG. 9;
  • FIG. 11 is a perspective view of a cutting blade assembly according to a second preferred embodiment of the present invention, the cutting blade assembly comprising a plurality of cutting blades, each of which is shown in FIG. 8, illustrating the cutting blade assembly securely fitted on a rotary shaft.
  • FIG. 3 is a view showing a cutting blade of a rotary drum type electric razor according to a first preferred embodiment of the present invention, the cutting blade being made by means of a pressing process;
  • FIG. 4 is a perspective view of the cutting blade according to the first preferred embodiment of the present invention shown in FIG. 3 illustrating a plurality of cutting members bent from a blade body of the pressed cutting blade along bending lines formed at the cutting blade, respectively;
  • FIG. 5 is a perspective view of a cutting blade assembly according to a first preferred embodiment of the present invention, the cutting blade assembly comprising a plurality of cutting blades, each of which is shown in FIG. 4, illustrating the cutting blade assembly securely fitted on a rotary shaft;
  • FIG. 6 is a front view of the cutting blade according to the first preferred embodiment shown in FIG. 4; and
  • FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6.
  • the present invention provides a cutting blade assembly of a rotary drum type electric razor wherein the cutting blade assembly is rotatably mounted to the upper end of a razor body of the rotary drum type electric razor for performing a cutting operation through the use of a rotating force of a motor mounted in the razor body, the cutting operation being carried out between the cutting blade assembly and a safety cover.
  • the cutting blade assembly comprises: a rotary shaft made of a circular steel bar, the rotary shaft being provided at both ends thereof with driving gears (not shown), to which power is transmitted from a power transmission unit; and a plurality of cutting blades each formed in the shape of a polygon, each of the cutting blades being provided at the center thereof with a fitting hole, which is formed by means of a burring process such that the cutting blades are forcibly fitted on the rotary shaft, the cutting blades being securely fitted on the middle part of the rotary shaft such that the cutting blades are rotated in the same direction as the rotary shaft to perform a cutting operation when the motor is operated.
  • a cutting blade 10 according to a first preferred embodiment of the present invention has a fitting hole 11 formed at the center of a blade body thereof and a plurality of cutting members 12 integrally formed with the blade body of the cutting blade 10 while being uniformly spaced apart from each other in the circum- ferential direction of the blade body of the cutting blade 10 about the fitting hole 11.
  • the cutting blade 10 is made by means of a pressing process.
  • Each of the cutting members 12 is provided at one edge thereof with a cutting part 122.
  • the cutting members 12 are bent from the blade body of the cutting blade 10 along bending lines 121 formed at the cutting blade 1Q respectively.
  • protrusions 124 which are disposed on the middle parts of the bending lines 121, respectively, as shown in FIG. 4.
  • grooves 125 which correspond to the protrusions 124, respectively.
  • the protrusions 124 are formed at the front lower ends of the cutting members 12, and the grooves 125 are formed at the rear lower ends of the cutting members 12 while the grooves 125 correspond to the protrusions 124. As a result, the strength of each of the cutting members 12 is increased.
  • the cutting members 12 are bent from the blade body of the cutting blade 10 along the bending lines 121 formed at the lower ends of the cutting members 12, respectively.
  • the cutting blades 10 each having the cutting members 12 bent from the blade body of the cutting blade 10 as shown in FIG. 4 are securely fitted in large numbers on a rotary shaft 2Q as shown in FIG. 5. In this way, a cutting blade assembly 100 is provided.
  • the cutting members 12 formed at the outer circumference of the blade body of the cutting blade 10 are spaced approximately 30 to 45 degrees from each other about the fitting hole 11. Consequently, hair is prevented from being caught between the cutting blades 10.
  • FIG. 6, which is a front view of the cutting blade
  • FIG. 7, which a cross-sectional view taken along line A-A of FIG. 6 the cutting members 12 formed at the outer circumference of the blade body of the cutting blade 10 are bent forwardly from the blade body of the cutting blade 10 along the bending lines 121.
  • FIGS. 8 to 11 A cutting blade assembly according to a second preferred embodiment of the present invention is shown in FIGS. 8 to 11.
  • FIG. 8 is a perspective view showing a cutting blade of a rotary drum type electric razor according to a second preferred embodiment of the present invention
  • FIG. 9 is a front view of the cutting blade according to the second preferred embodiment of the present invention shown in FIG. 8
  • FIG. 10 is a cross-sectional view taken along line B-B of FIG. 9
  • FIG. 11 is a perspective view of a cutting blade assembly according to a second preferred embodiment of the present invention, the cutting blade assembly comprising a plurality of cutting blades, each of which is shown in FIG. 8, illustrating the cutting blade assembly securely fitted on a rotary shaft.
  • the cutting blade assembly according to a second preferred embodiment of the present invention comprises a plurality of cutting blades 220 (Refer to FIG. 11).
  • each cutting blade 220 is formed in the shape of a decagon.
  • the cutting blade 220 is forcibly fitted on the rotary shaft 20 through the fitting hole 223.
  • each of the cutting members 221 is twisted such that each of the cutting members 221 has a twist angle ⁇ of approximately 14 to 18 degrees.
  • Each of the cutting members 221 is provided at one edge thereof with a cutting part 222 to perform a cutting operation between the cutting parts 222 and a safety cover when the rotary shaft 20 is rotated.
  • the cutting part 222 is formed such that the cutting part 222 has a cutting angle of approximately 10 to 15 degrees.
  • each of the cutting members 221 is twisted such that each of the cutting members 221 has the predetermined twist angle ⁇ and each of the cutting parts 222 is formed such that each of the cutting parts 222 has the predetermined cutting angle . Consequently, the cutting efficiency is increased. Also, the cutting members 221 are uniformly spaced apart from each other. Consequently, hair is prevented from being caught between the cutting blades 220.
  • the present invention provides a cutting blade assembly of a rotary drum type electric razor having a plurality of cutting blades wherein each of the cutting blades has a predetermined cutting angle. Consequently, the present invention has the effect of increasing the cutting efficiency. Also, hair is prevented from being caught in the space defined between the cylindrical body and the cutting blades due to the small length of each of the cutting blades after shaving.
  • each of the cutting blades is made by means of a pressing process to obtain a plurality of cutting members bent from a blade body of each pressed cutting blade along bending lines formed at the cutting blade, respectively, and the cutting blades are securely fitted on a rotary shaft, whereby the manufacturing process of the cutting blade assembly is simplified, and thus the manufacturing cost of the cutting blade assembly is reduced. Also, protrusions are formed on the middle parts of the bending lines at the front part of the cutting blade, specifically at the front lower ends of the cutting members. Consequently, the present invention has the effect of increasing a supporting force.
  • the cutting members are spaced approximately 30 to 45 degrees from each other about a fitting hole. Consequently, the present invention has the effect of preventing hair from being caught between the cutting blades.

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  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Dry Shavers And Clippers (AREA)

Abstract

A cutting blade assembly of a rotary drum type electric razor comprises a rotary shaft and a plurality of cutting blades (10). Each cutting blade (10) is provided at the center thereof with a fitting hole (11). Each cutting blade (10) has cutting members (12) integrally formed with a blade body of each cutting blade while being uniformly spaced apart from each other. Each cutting member (12) is provided at one edge thereof with a cutting part (122). The cutting members (12) are bent from the blade body of each cutting blade (10) along bending lines (121) formed at each cutting blade, respectively. Each cutting blade (10) is provided at the front part thereof with protrusions (124), which are disposed on the middle parts of the bending lines (121), respectively, and each cutting blade (10) is provided at the rear part thereof with grooves (125) corresponding to the respective protrusions.

Description

Description CUTTING BLADE ASSEMBLY OF ROTARY DRUM TYPE ELECTRIC RAZOR Technical Field
[1] The present invention relates to a cutting blade assembly of a rotary drum type electric razor, and more particularly to a cutting blade assembly of a rotary drum type electric razor comprising a plurality of cutting blades rotatable in a safety cover of the rotary drum type electric razor wherein each of the cutting blades is made by means of a pressing process to obtain a plurality of cutting members bent from a blade body of each pressed cutting blade along bending lines formed at the cutting blade, respectively, and the cutting blades are securely fitted on a rotary shaft, whereby the manufacturing process of the cutting blade assembly is simplified, and thus the manufacturing cost of the cutting blade assembly is reduced. Background Art
[2] As shown in FIG. 1, a rotary drum type electric razor generally comprises: a razor body 1; a motor 2 mounted in the razor body 1, especially on a central axis of the razor body 1 ; a power transmission unit (not shown) to transmit a rotary force of the motor to a driving shaft 4 of a cutting blade assembly 3; and a safety cover 5 disposed above the blade assembly 3 for protecting the cutting blade assembly 3.
[3] As shown in FIG. 2, the cutting blade assembly 3 comprises a plurality of spiral cutting blades 7 formed on the outer circumference of a cylindrical body 6, which is made of metal. The cutting operation is performed between the spiral cutting blades 7 and the safety cover 5.
[4] The driving shaft 4 is inserted through the center of the cylindrical body 6. To both ends of the driving shaft 4 are securely fixed driven gears (not shown), respectively, to which power is transmitted from the power transmission unit.
[5] The cutting blades 7 are integrally formed at the outer circumference of the metal cylindrical body 6, which is made by means of insert injection. Also, additional SUS blades are securely attached to the outer circumference of the cylindrical body 6 so that the SUS blades can perform a cutting operation together with the cutting blades 7.
[6] In the conventional cutting blade assembly of the rotary drum type electric razor with the above-stated construction, the cutting blades are integrally formed at the outer circumference of the cylindrical body made by means of the insert injection so that the cutting blades perform a cutting operation together with the above-mentioned additional SUS blades. However, each of the cutting blades does not have a cutting angle with the result that the cutting efficiency is lowered. Furthermore, each of the cutting blades has a short length with the result that hair is caught between the cutting blades after shaving.
[7] In order to solve the above-mentioned problems, there has been proposed a cutting blade assembly of a rotary drum type electric razor wherein the cutting blade assembly is rotatably mounted to the upper end of a razor body of the rotary drum type electric razor for performing a cutting operation through the use of a rotating force of a motor mounted in the razor body, the cutting operation being carried out between the cutting blade assembly and a safety cover. The cutting blade assembly is disclosed in Korean Utility Model Application No. 2003-0014439, which has been filed in the name of the applicant of the present application. The cutting blade assembly comprises: a rotary shaft made of a circular steel bar, the rotary shaft being provided at both ends thereof with driving gears, to which power is transmitted from a power transmission unit; and a plurality of cutting blades each formed in the shape of a polygon, each of the cutting blades being provided at the center thereof with a fitting hole, which is formed by means of a burring process such that the cutting blades are forcibly fitted on the rotary shaft, each of the cutting blades having a plurality of cutting members formed on the outer circumference thereof while being uniformly spaced apart from each other, each of the cutting members being twisted at a predetermined twist angle β each of the cutting members being provided at one edge thereof with a cutting part having a predetermined cutting angle α,the cutting blades being securely fitted on the middle part of the rotary shaft.
[8] With the cutting blade assembly disclosed in Korean Utility Model Application No. 2003-0014439, the cutting efficiency is improved since each of the cutting blades has the predetermined cutting angle, and hair is prevented from being caught in the space defined between the cylindrical body and the cutting blades due to the small length of each of the cutting blades after shaving. However, it is necessary to twist the cutting members such that each of the cutting members has the predetermined twist angle β and to shape the edge of each of the cutting members such that the cutting part has the predetermined cutting angle . As a result, the manufacturing process of the cutting blade assembly is complicated, and thus the manufacturing cost of the cutting blade assembly is increased.
[9] Disclosure of Invention Technical Solution
[10] Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide a cutting blade assembly of a rotary drum type electric razor comprising a plurality of cutting blades made by means of a pressing process to obtain a plurality of cutting members bent from a blade body of each pressed cutting blade along bending lines formed at the cutting blade, respectively, and the cutting blades are securely fitted on a rotary shaft, whereby the manufacturing process of the cutting blade assembly is simplified, and thus the manufacturing cost of the cutting blade assembly is reduced.
[11] In accordance with the present invention, the above and other objects can be accomplished by the provision of a cutting blade assembly of a rotary drum type electric razor, the cutting blade assembly being rotatably mounted to the upper end of a razor body of the rotary drum type electric razor for performing a cutting operation through the use of a rotating force of a motor mounted in the razor body, the cutting operation being carried out between the cutting blade assembly and a safety cover, the cutting blade assembly comprising: a rotary shaft made of a circular steel bar, the rotary shaft being provided at both ends thereof with driving gears, to which power is transmitted from a power transmission unit; and a plurality of cutting blades each formed in the shape of a polygon, each of the cutting blades being provided at the center thereof with a fitting hole, which is formed by means of a burring process such that the cutting blades are forcibly fitted on the rotary shaft, the cutting blades being securely fitted on a middle part of the rotary shaft, wherein: each of the cutting blades has a plurality of cutting members integrally formed with a blade body of each of the cutting blades while being uniformly spaced apart from each other in the circumferential direction of the blade body of each of the cutting blades, each of the cutting blades being made by means of a pressing process; each of the cutting members is provided at one edge thereof with a cutting part, the cutting members being bent from the blade body of each of the cutting blades along bending lines formed at each of the cutting blades, respectively; and each of the cutting blades is provided at the front part thereof with protrusions, which are disposed on the middle parts of the bending lines, respectively, and each of the cutting blades is provided at the rear part thereof with grooves corresponding to the respective protrusions.
[12] Preferably, the cutting members, formed at the outer circumference of the blade body of each of the cutting blades, are spaced approximately 30 to 45 degrees from each other about the fitting hole. Brief Description of the Drawings
[13] The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which: [14] FIG. 1 is a view showing the structure of a general rotary drum type electric razor;
[15] FIG. 2 is a perspective view showing a cutting blade assembly of a conventional rotary drum type electric razor; [16] FIG. 3 is a view showing a cutting blade of a rotary drum type electric razor according to a first preferred embodiment of the present invention, the cutting blade being made by means of a pressing process; [17] FIG. 4 is a perspective view of the cutting blade according to the first preferred embodiment of the present invention shown in FIG. 3 illustrating a plurality of cutting members bent from a blade body of the pressed cutting blade along bending lines formed at the cutting blade, respectively; [18] FIG. 5 is a perspective view of a cutting blade assembly according to a first preferred embodiment of the present invention, the cutting blade assembly comprising a plurality of cutting blades, each of which is shown in FIG. 4, illustrating the cutting blade assembly securely fitted on a rotary shaft; [19] FIG. 6 is a front view of the cutting blade according to the first preferred embodiment shown in FIG. 4; [20] FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6;
[21] FIG. 8 is a perspective view showing a cutting blade of a rotary drum type electric razor according to a second preferred embodiment of the present invention; [22] FIG. 9 is a front view of the cutting blade according to the second preferred emb odiment of the present invention shown in FIG. 8; [23] FIG. 10 is a cross-sectional view taken along line B-B of FIG. 9; and
[24] FIG. 11 is a perspective view of a cutting blade assembly according to a second preferred embodiment of the present invention, the cutting blade assembly comprising a plurality of cutting blades, each of which is shown in FIG. 8, illustrating the cutting blade assembly securely fitted on a rotary shaft. Best Mode for Carrying Out the Invention [25] Now, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.
[26]
[27] First embodiment
[28] A cutting blade assembly according to a first preferred embodiment of the present invention is shown in FIGS. 3 to 7.
[29] FIG. 3 is a view showing a cutting blade of a rotary drum type electric razor according to a first preferred embodiment of the present invention, the cutting blade being made by means of a pressing process; FIG. 4 is a perspective view of the cutting blade according to the first preferred embodiment of the present invention shown in FIG. 3 illustrating a plurality of cutting members bent from a blade body of the pressed cutting blade along bending lines formed at the cutting blade, respectively; FIG. 5 is a perspective view of a cutting blade assembly according to a first preferred embodiment of the present invention, the cutting blade assembly comprising a plurality of cutting blades, each of which is shown in FIG. 4, illustrating the cutting blade assembly securely fitted on a rotary shaft; FIG. 6 is a front view of the cutting blade according to the first preferred embodiment shown in FIG. 4; and FIG. 7 is a cross-sectional view taken along line A-A of FIG. 6.
[30] The present invention provides a cutting blade assembly of a rotary drum type electric razor wherein the cutting blade assembly is rotatably mounted to the upper end of a razor body of the rotary drum type electric razor for performing a cutting operation through the use of a rotating force of a motor mounted in the razor body, the cutting operation being carried out between the cutting blade assembly and a safety cover. The cutting blade assembly comprises: a rotary shaft made of a circular steel bar, the rotary shaft being provided at both ends thereof with driving gears (not shown), to which power is transmitted from a power transmission unit; and a plurality of cutting blades each formed in the shape of a polygon, each of the cutting blades being provided at the center thereof with a fitting hole, which is formed by means of a burring process such that the cutting blades are forcibly fitted on the rotary shaft, the cutting blades being securely fitted on the middle part of the rotary shaft such that the cutting blades are rotated in the same direction as the rotary shaft to perform a cutting operation when the motor is operated.
[31] Referring to FIG. 3, a cutting blade 10 according to a first preferred embodiment of the present invention has a fitting hole 11 formed at the center of a blade body thereof and a plurality of cutting members 12 integrally formed with the blade body of the cutting blade 10 while being uniformly spaced apart from each other in the circum- ferential direction of the blade body of the cutting blade 10 about the fitting hole 11. The cutting blade 10 is made by means of a pressing process. Each of the cutting members 12 is provided at one edge thereof with a cutting part 122. The cutting members 12 are bent from the blade body of the cutting blade 10 along bending lines 121 formed at the cutting blade 1Q respectively. [32] At the front part of the cutting blade 10 are formed protrusions 124, which are disposed on the middle parts of the bending lines 121, respectively, as shown in FIG. 4. At the rear part of the cutting blade 10 are also formed grooves 125, which correspond to the protrusions 124, respectively. [33] Specifically, the protrusions 124 are formed at the front lower ends of the cutting members 12, and the grooves 125 are formed at the rear lower ends of the cutting members 12 while the grooves 125 correspond to the protrusions 124. As a result, the strength of each of the cutting members 12 is increased. [34] As shown in FIG. 4, the cutting members 12 are bent from the blade body of the cutting blade 10 along the bending lines 121 formed at the lower ends of the cutting members 12, respectively. [35] The cutting blades 10 each having the cutting members 12 bent from the blade body of the cutting blade 10 as shown in FIG. 4 are securely fitted in large numbers on a rotary shaft 2Q as shown in FIG. 5. In this way, a cutting blade assembly 100 is provided. [36] The cutting members 12 formed at the outer circumference of the blade body of the cutting blade 10 are spaced approximately 30 to 45 degrees from each other about the fitting hole 11. Consequently, hair is prevented from being caught between the cutting blades 10. [37] As can be seen from FIG. 6, which is a front view of the cutting blade, and FIG. 7, which a cross-sectional view taken along line A-A of FIG. 6, the cutting members 12 formed at the outer circumference of the blade body of the cutting blade 10 are bent forwardly from the blade body of the cutting blade 10 along the bending lines 121. [38]
[39] Second embodiment
[40] A cutting blade assembly according to a second preferred embodiment of the present invention is shown in FIGS. 8 to 11. [41] FIG. 8 is a perspective view showing a cutting blade of a rotary drum type electric razor according to a second preferred embodiment of the present invention; FIG. 9 is a front view of the cutting blade according to the second preferred embodiment of the present invention shown in FIG. 8; FIG. 10 is a cross-sectional view taken along line B-B of FIG. 9; and FIG. 11 is a perspective view of a cutting blade assembly according to a second preferred embodiment of the present invention, the cutting blade assembly comprising a plurality of cutting blades, each of which is shown in FIG. 8, illustrating the cutting blade assembly securely fitted on a rotary shaft.
[42] The cutting blade assembly according to a second preferred embodiment of the present invention comprises a plurality of cutting blades 220 (Refer to FIG. 11).
[43] As shown in FIG. 8, each cutting blade 220 is formed in the shape of a decagon. At the center of a blade body of the cutting blade 220 is formed a fitting hole 223, which is formed by means of a burring process. The cutting blade 220 is forcibly fitted on the rotary shaft 20 through the fitting hole 223.
[44] At the outer circumference of the blade body of the cutting blade 220 are formed a plurality of cutting members 221 which are uniformly spaced apart from each other in the circumferential direction of the blade body of the cutting blade 220 about the fitting hole 223. Each of the cutting members 221 is twisted such that each of the cutting members 221 has a twist angle β of approximately 14 to 18 degrees.
[45] Each of the cutting members 221 is provided at one edge thereof with a cutting part 222 to perform a cutting operation between the cutting parts 222 and a safety cover when the rotary shaft 20 is rotated. The cutting part 222 is formed such that the cutting part 222 has a cutting angle of approximately 10 to 15 degrees.
[46] In the cutting blade assembly of the rotary drum type electric razor with the above- stated construction according to the second preferred embodiment of the present invention, each of the cutting members 221 is twisted such that each of the cutting members 221 has the predetermined twist angle β and each of the cutting parts 222 is formed such that each of the cutting parts 222 has the predetermined cutting angle . Consequently, the cutting efficiency is increased. Also, the cutting members 221 are uniformly spaced apart from each other. Consequently, hair is prevented from being caught between the cutting blades 220. Industrial Applicability
[47] As apparent from the above description, the present invention provides a cutting blade assembly of a rotary drum type electric razor having a plurality of cutting blades wherein each of the cutting blades has a predetermined cutting angle. Consequently, the present invention has the effect of increasing the cutting efficiency. Also, hair is prevented from being caught in the space defined between the cylindrical body and the cutting blades due to the small length of each of the cutting blades after shaving. [48] According to the present invention, each of the cutting blades is made by means of a pressing process to obtain a plurality of cutting members bent from a blade body of each pressed cutting blade along bending lines formed at the cutting blade, respectively, and the cutting blades are securely fitted on a rotary shaft, whereby the manufacturing process of the cutting blade assembly is simplified, and thus the manufacturing cost of the cutting blade assembly is reduced. Also, protrusions are formed on the middle parts of the bending lines at the front part of the cutting blade, specifically at the front lower ends of the cutting members. Consequently, the present invention has the effect of increasing a supporting force.
[49] Furthermore, the cutting members are spaced approximately 30 to 45 degrees from each other about a fitting hole. Consequently, the present invention has the effect of preventing hair from being caught between the cutting blades.
[50] Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art 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.
[51]
[52]

Claims

Claims
[1] A cutting blade assembly of a rotary drum type electric razor, the cutting blade assembly being rotatably mounted to the upper end of a razor body of the rotary drum type electric razor for performing a cutting operation through the use of a rotating force of a motor mounted in the razor body, the cutting operation being carried out between the cutting blade assembly and a safety cover, the cutting blade assembly comprising: a rotary shaft made of a circular steel bar, the rotary shaft being provided at both ends thereof with driving gears, to which power is transmitted from a power transmission unit; and a plurality of cutting blades each formed in the shape of a polygon, each of the cutting blades being provided at the center thereof with a fitting hole, which is formed by means of a burring process such that the cutting blades are forcibly fitted on the rotary shaft, the cutting blades being securely fitted on a middle part of the rotary shaft, wherein: each of the cutting blades has a plurality of cutting members integrally formed with a blade body of each of the cutting blades while being uniformly spaced apart from each other in the circumferential direction of the blade body of each of the cutting blades, each of the cutting blades being made by means of a pressing process; each of the cutting members is provided at one edge thereof with a cutting part, the cutting members being bent from the blade body of each of the cutting blades along bending lines formed at each of the cutting blades, respectively; and each of the cutting blades is provided at the front part thereof with protrusions, which are disposed on the middle parts of the bending lines, respectively, and each of the cutting blades is provided at the rear part thereof with grooves corresponding to the respective protrusions.
[2] The assembly as set forth in claim 1, wherein the cutting members, formed at the outer circumference of the blade body of each of the cutting blades, are spaced approximately 30 to 45 degrees from each other about the fitting hole.
[3] The assembly as set forth in claim 1, wherein each of the cutting members is twisted such that each of the cutting members has a predetermined twist angle, and each of the cutting members is provided at one edge thereof with a cutting part having a predetermined cutting angle.
[4] The assembly as set forth in claim 3, wherein each of the cutting members is twisted such that each of the cutting members has a twist angle of approximately 14 to 18 degrees. [5] The assembly as set forth in claim 3, wherein the cutting part is formed such that the cutting part has a cutting angle of approximately 10 to 15 degrees.
PCT/KR2004/002184 2004-06-01 2004-08-31 Cutting blade assembly of rotary drum type electric razor WO2005118235A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20-2004-0015253 2004-06-01
KR20-2004-0015253U KR200361435Y1 (en) 2004-06-01 2004-06-01 Cutting blade assembly of electric razor by rotating drum type

Publications (1)

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WO2005118235A1 true WO2005118235A1 (en) 2005-12-15

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1900487A1 (en) * 2006-09-12 2008-03-19 Tae-Jun Oh A cutting blade assembly of rotation drum type electric razor
US20100299929A1 (en) * 2009-05-28 2010-12-02 Tae-Jun Oh Insert Type Blade Assembly of Rotation Drum Type Electric Razor
CN106799751A (en) * 2017-02-20 2017-06-06 吴让攀 Blade of rotary electric shaver and processing method thereof
CN109202972A (en) * 2018-10-26 2019-01-15 浙江海顺电工有限公司 Piece-discharge type moving blade device and shaver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200462956Y1 (en) 2009-04-22 2012-10-11 오태준 Rotation drum type electric razor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343086A (en) * 1979-05-23 1982-08-10 U.S. Philips Corporation Shaving apparatus
JPH05317535A (en) * 1992-05-18 1993-12-03 Kyushu Hitachi Maxell Ltd Rotary electric razor
KR200323288Y1 (en) * 2003-05-10 2003-08-14 오태준 A blade assembly of Rotation drum type electric razor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4343086A (en) * 1979-05-23 1982-08-10 U.S. Philips Corporation Shaving apparatus
JPH05317535A (en) * 1992-05-18 1993-12-03 Kyushu Hitachi Maxell Ltd Rotary electric razor
KR200323288Y1 (en) * 2003-05-10 2003-08-14 오태준 A blade assembly of Rotation drum type electric razor

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1900487A1 (en) * 2006-09-12 2008-03-19 Tae-Jun Oh A cutting blade assembly of rotation drum type electric razor
US20100299929A1 (en) * 2009-05-28 2010-12-02 Tae-Jun Oh Insert Type Blade Assembly of Rotation Drum Type Electric Razor
US8316546B2 (en) * 2009-05-28 2012-11-27 Tae-Jun Oh Insert type blade assembly of rotation drum type electric razor
CN106799751A (en) * 2017-02-20 2017-06-06 吴让攀 Blade of rotary electric shaver and processing method thereof
CN109202972A (en) * 2018-10-26 2019-01-15 浙江海顺电工有限公司 Piece-discharge type moving blade device and shaver

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