The above and other objects and features of the present invention will become apparent from the following description of embodiments given in conjunction with the accompanying drawings, in which:
Hereinafter, embodiments of the present invention will be disclosed with reference to the accompanying drawings. A hair clipper in accordance with an embodiment of the present invention has an elongated main body 1, which also functions as a grip, as shown in
Referring to
The output shaft 9 projects upward in the drawing from the housing 6 to be connected to a guide plate 17, which will be described later, provided on the blade block 4. A dial 13 for adjusting the cutting height is rotatably disposed above (in the drawing) the operating switch 10 on an outer surface of the housing 6. A transmitting mechanism 15 is provided in the main body housing 6, the transmitting mechanism 15 raising or tilting a later-described switch lever 19 of the blade block 4 in association with normal or reverse rotation of the dial 13.
The raising and tilting operation of the switch lever 19 is carried out through the transmitting mechanism. That is, if the dial 13 is rotated in a normal direction, the switch lever 19 is turned to be raised through the transmitting mechanism 15 against the biasing force of the push-up spring 18. As a result, the movable blade 3 slides such that the leading ends of the blade pieces 30 approach those of the blade piece 20 of the fixed blade 2. If the dial 13 is rotated in a reverse direction, the switch lever 19 turns to be tilted by the biasing force of the push-up spring 18, and the movable blade 3 slides such that the leading ends of the blade pieces 30 are separated away from those of the blade piece 20 of the fixed blade 2. Each blade piece 20 of the fixed blade 2 is tapered as viewed from side such that its thickness is varied along the projecting direction Y. Therefore, by changing the slide position of the movable blade 3 with respect to the fixed blade 2, the cutting height of the hair 40 can be adjusted.
As shown
Meanwhile, each blade piece 30 of the movable blade overlapped with the fixed blade 2 protrudes in a substantially same direction as the blade piece 20 of the fixed blade 2. The blade edges 31 provided at both sides of each of the blade piece 30 is formed along the projecting direction Y of each blade piece 30. Each blade piece 30 of the movable blades 3 includes an isosceles trapezoid-shaped leading part 33, as viewed from front, which becomes wider as it goes to the leading end, and an isosceles trapezoid-shaped basal part 34, as viewed from front, which becomes wider as it goes to the basal end. Accordingly, the blade edges 31 formed at both sides of each blade piece 30 at the fixed blade 2 side includes blade edges formed at both sides of the leading part 33 and both sides of the basal part 34. Blade edges formed at both sides of the leading part, i.e., leading rectilinear parts 35 are inclined in such a way that the distance between the adjacent blade pieces 30 (width of the blade groove 32) becomes greater as it goes from the leading end of the blade piece 30 to the basal end thereof. Blade edges formed at both sides of the basal part 34, i.e., basal rectilinear parts 36 are connected to a basal end of the rectilinear part 35 and inclined in such a way that the distance between the adjacent blade pieces 30 becomes smaller as it goes from the connected point to the basal end of the blade piece 30.
The overall shape of the leading rectilinear part 35 and the basal rectilinear part 36 of each blade edge 31 is “<” or “>” as viewed from front. The curved portion of the “<” or “>” shape in the blade edge 31 may be provided with a third surface, i.e., an inclined surface having a different angle from the leading rectilinear part 35 and the basal rectilinear part 36, or a surface parallel with the projecting direction Y.
The leading rectilinear parts 35 and the basal rectilinear parts 36 of the blade edges 31 of both sides of each blade piece 30 are inclined with respect to the linear shape blade edges 21 of the fixed blade 2, which is interposed between the blade pieces 30 and performs a cutting action, thereby forming an acute included angle α therebetween. The included angle α is the angle between the blade edge 21 of the fixed blade 2 and the blade edge 31 of the movable blade 3. The angle α is set in a range of 0°<α<40° both for the leading rectilinear part 35 and the basal rectilinear part 36. Further, the range of the included angle α is an optimum range which is experimentally derived from the relation between the included angle α and the number of the cut hair 40 as shown
Further, each blade edge 31 of the movable blade 3 is provided with a rake surface 37 facing an opposite side to the fixed blade 2 (noncontact surface) inclined with respect to the sliding direction of the movable blade 3 by a acute rake angle β, extending across the leading rectilinear part 35 and the basal rectilinear part 36. The rake surface 37 is made to be closer to the fixed blade 2 as it goes to the leading end of the blade edge 31. Both side surfaces of the blade edge 31 of each blade piece 30 of the movable blade 3 are substantially perpendicular to the sliding surface thereof with respect to the fixed blade 2. The cross-sectional shape of the blade piece 30 has a trapezoidal portion at the half thereof on the side of the fixed blade 2 (lower portion) and a rectangular portion at the other half thereof on the other side (upper portion).
In the hair clipper as disclosed above, the blade edges 31 of the blade piece 30 are formed in the “<” or “>” shape so that the hair 40 introduced into each blade groove 32 of the movable blade 3, when cutting the hair, can be guided to the center portion of the blade groove 32 having a larger groove width. As a result, the hair 40 introduced into the blade groove 32 can be prevented from escaping therefrom. Further, the blade edges 31 of the movable blade 3 are inclined to the blade edges 21 of the blade piece 20 of the fixed blade 2 through out the entire length thereof by the acute included angle α so that the hair 40 can be cut effectively along the entire projecting direction Y of the blade piece 30 of the movable blade 3.
Furthermore, for example, in case the blade edges 31 have no acute rake angle β and no rake surface 37 as shown
While the invention has been shown and described with respect to the embodiments, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the scope of the invention.
Number | Date | Country | Kind |
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2006-236539 | Aug 2006 | JP | national |