JPH0233743Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to the blade body (movable blade or fixed blade) of an electric razor used for shaving hair, shaving edges, etc. It also allows for reliable shaving.

[Conventional technology]

FIGS. 3 and 4 illustrate a conventional electric razor for shaving downy hair, which is equipped with this seed blade. In this case, a blade unit 2 is removably provided at the front end of a main body case 1 containing a drive mechanism. The blade unit 2 includes a fixed blade 5 and a movable blade 6 interposed between a blade support 3 and a blade cover 4, which are stacked one above the other and integrally connected.

The fixed blade 5 is formed flat as a whole, and has flange portions 9 connected flush with the base 7 on both sides of the base 7 in the short side direction of a rectangular base 7 that is long in the front-rear direction in plan view. The mounting pins 12, 12 have comb-shaped incisors 10 arranged in a row in the front and back direction, two mounting holes 11 (front and rear) are provided in the base 7, and the mounting holes 11, 11 are protruded from the blade support 3. and are fixed on the blade support 3. This fixed blade 5 is set to have a thin plate thickness of about 0.4 mm.

The entire movable blade 6 is bent into a hat shape in cross section, and has upright portions 14 on both sides in the short side direction of a rectangular base portion 13 that is long in the front and back direction in plan view.
14 are arranged in series, and a flange portion 15 is extended outward from each rising portion 14, and each flange portion 15
The incisors 16 are arranged in rows in the front-back direction. The movable blade 6 can be mounted on the fixed blade 5 by inserting the mounting pins 12, 12 protruding from the fixed blade 5 through two longitudinally long mounting holes 17, 17 provided in the base 13 of the movable blade 6. Under the guidance of the mounting pin 12, they are slidably overlapped in the front-rear direction. An engaged portion 18 is provided at the rear end of the movable blade 6, and this engaged portion 18 is engaged with a drive rod 19 that reciprocates back and forth within the main body case 1. This movable blade 8 is made by pressing a thin plate material with a thickness of about 0.2 mm.

A plate spring 20 is attached to the top of the movable blade 6 by inserting the mounting pins 12, 12 protruding from the movable blade 6 through two mounting holes 21 provided in the front and back, respectively, and the spring pressure causes the movable blade 6 to The flange portion 15 of the fixed blade 5 is brought into pressing contact with the upper surface of the fixed blade 5 with an even force.

However, a thin movable blade 6 with a thickness of about 0.2 to 0.4 mm
Since the fixed blade 5 has low mechanical strength, a gap is created between the sliding surfaces of the movable blade 6 and the fixed blade 5 due to the following reasons, and hair is caught in this gap during use. This will impair sharpness. This is especially a problem when cutting extremely thin hair of about 0.005 mm, such as downy hair.

(1) For example, when press forming the movable blade 6,
A torsional moment T as shown in FIG. 6 is generated in the base 13, and this torsional moment T causes the base 1
The residual strain stored in the base 13 is released during heat treatment such as hardening of the incisors 16, causing the base 13 to undergo deformation such that its widthwise central portion bends downward, as shown in FIG. . As a result of this deformation, the flange portion 15 is warped upward, and
When the movable blade 6 and the fixed blade 5 are assembled, a gap is generated between the sliding surfaces of the flanges 15 and 9. Incidentally, the same problem also occurs when the fixed blade 5 is formed into a hat shape having the same cross-sectional shape as the movable blade 6, different from the flat shape shown in the illustrated example.

(2) Between the sliding surfaces of the flange portion 15 of the movable blade 6 and the flange portion 9 of the fixed blade 5, the smooth surface precision of these flange portions 15 and 9 is set to be as high as possible to minimize the gap between the two. In order to eliminate this, for example, a grinding process such as wrapping process is performed. (for example,
(Japanese Patent Application Laid-Open No. 1983-62736). However, when the flange portion 15 of the movable blade 6 bent into a hat shape is wrapped to give a smooth surface, a uniformly distributed load w will act on the base portion 13 as shown in FIG. The base portion 13 and the flange portion 15 undergo deformation similar to that described in (1) above, and since the wrapping process is performed in this state, the grinding allowance on the side edge of the rising portion 14 of the flange portion 15 is large, and as a result, the thickness of this portion is reduced. The thickness becomes thinner. After the wrapping process is completed, the movable blade 6 will return to its original shape, but since the wall thickness at the end of the rising portion 14 of the flange portion 15 is thinner, the movable blade 6 will return to its original shape.
When the fixed blade 5 and the fixed blade 5 overlap, a gap is generated between the sliding surfaces of the flange parts 15 and 9, as shown in FIG. Incidentally, the same problem can be said when the fixed blade 5 is formed in the same hat shape as the cross-sectional shape of the movable blade 6.

(3) When in use, the movable blade 6 is attached to the mounting pin 1.
2 and 12 while reciprocating, the base 1
The load point of the pressing spring 20 on the base 13 changes periodically in the reciprocating direction, and a fluctuating load acts on the base 13, and frictional force or the mounting pin 12,
A tensile force in the side direction of the base due to the reaction force from 12 acts. If this happens, the entire base 13 will be torsionally deformed, and its flatness will be impaired. As a result of this deviation in flatness being reflected on the flange portion 15, a gap is generated between the sliding surfaces of the movable blade 6 and the fixed blade 5.

In order to solve this problem, for example, the thickness of the movable blade 6 may be increased to improve its mechanical strength, but in this case, the weight of the movable blade 6 increases and the reciprocating mechanism This is not appropriate because the load will be large.

Therefore, conventionally, for example, Japanese Patent Laid-Open No. 54-6651 discloses an improved technique that attempts to solve the problems mentioned in (1), (2), and (3) without increasing the thickness of the movable blade 6. There is something like the one shown. In this case, as shown in FIG. 7, a plurality of elongated reinforcing ribs 23 are arranged in parallel in the short side direction of the base 13 to increase the strength thereof.

[Problem that the invention attempts to solve]

However, in the case of the conventional improved technique described above, there is a limit in increasing the strength of the movable blade 6, and the problems mentioned in (1), (2), and (3) cannot be sufficiently solved.

The present invention was devised to sufficiently solve these problems, and even if the rigidity of the movable blade or fixed blade with a hat-shaped cross section is increased and the plate thickness is reduced, the processing and use of the base of these blades will be difficult. It is an object of the present invention to improve sharpness by reducing deformation during cutting as much as possible, effectively and reliably preventing the formation of a gap between the sliding surfaces of a movable blade and a fixed blade.

[Means for solving problems]

In order to achieve the above object, the present invention assumes a movable blade 6 or a fixed blade 5 bent into a hat-shaped cross section as shown in FIGS. , is characterized in that it is provided on reinforcing ribs 22 that are continuous in the diagonal direction.

[Effect]

When the reinforcing ribs 22 are provided continuously in the diagonal direction of the base 13 or 7, the mechanical strength of the base 13 or 7 is improved compared to the conventional structure shown in FIG. The strength, that is, the bending rigidity is significantly improved, and as a result, the base 13 or 7
The bending deformation during the wrapping process in which a uniformly distributed load w is applied to the blade can be significantly reduced, and the thickness of the flange part 15 of the movable blade 6 or the flange part 9 of the fixed blade 5 after the wrapping process can be ensured to be uniform. Can be done. At the same time, the torsional rigidity of the base portion 13 or 7 can be significantly improved, so that torsional deformation during use can be significantly reduced.

In addition, since the flat surface of the base 13 or 7 is divided into a large number of divisional surfaces A by the reinforcing ribs 22 that continue in the diagonal direction, each divisional surface A is deformed independently. There is also no possibility that the bending deformation and torsional deformation of the screen A will be superimposed and cause a large deformation.

〔Example〕

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

The overall configuration of the electric shaver, fixed blade 5, and movable blade 6 is almost the same as the conventional one described above, so corresponding parts will be given the same reference numerals and explanations will be omitted, and different parts will be omitted. I will only explain.

Base 13 of movable blade 6 bent into a hat shape
The entire surface of the mounting hole 17, except for the mounting hole 17, is provided with reinforcing ribs 22 continuous in diagonal lines and directions parallel thereto, in the form of a mesh as a whole. It is opened so that it exists within section screen A.

[Another example]

Although the above embodiment describes the case where the reinforcing ribs 22 are provided on the movable blade 6, the invention can be similarly applied to the fixed blade 5. Although not shown, if the fixed blade 5 is also provided with reinforcing ribs 22, the fixed blade 5 shown in FIG.
The rising portions 14, 14 are provided in series on both sides in the short side direction, and each rising portion 14 is formed into a hat shape with a projecting flange portion 9.
A reinforcing rib 22 is provided which continues in the diagonal direction.

In addition, in each example, the movable blade 6 and the fixed blade 5
Incisor teeth 1 are provided on the flange portions 15 or 9 on both sides in the short side direction.
Although a double-edged type in which the incisors 6 or 10 are provided has been described, the present invention can be similarly applied to a single-edged type in which the incisors are provided only on the flange portion 15 or 9 on one side.

[Effect of idea]

As explained above, according to the present invention, the simple structure is that the base 13 or 7 of the movable blade 6 or the fixed blade 5 bent into a hat-shaped cross section is provided with reinforcing ribs 22 that continue in the diagonal direction. Movable blade 6
Alternatively, even if the rigidity of the fixed blade 5 can be significantly increased and the plate thickness can be reduced, deformation during heat treatment, lapping and use can be well suppressed, and there is no gap between the sliding surfaces of the movable blade 6 and the fixed blade 5. It can effectively and reliably prevent the occurrence of hair loss, and it can dramatically improve the sharpness of even thin hair such as downy hair.

[Brief explanation of the drawing]

1 and 2 show one embodiment of the present invention, FIG. 1 is a plan view of the movable blade, and FIG. 2 is a plan view of the movable blade.
It is a sectional view taken along the - line in the figure. Fig. 3 is an external perspective view of a conventional electric shaver, Fig. 4 is an exploded perspective view of its main parts, and Figs. 5 and 6 are side and perspective views for explaining the problems of the conventional electric shaver. , FIG. 7 is a perspective view showing a conventional example provided with reinforcing ribs. 5... fixed blade, 6... movable blade, 7... base of fixed blade, 9... flange part of fixed blade, 10... incisor of fixed blade, 13... base of movable blade, 14... rising Part, 15... Flange part of movable blade, 16...
Movable blade incisor, 22...Reinforcement rib.

Claims (1)

[Scope of utility model registration request] A base 13 or 7 that is rectangular in plan view, and rising portions 14, 14 connected to both ends of the base in the short side direction.
and flange portions 15, 15 or 9, 9 extending outward from each rising portion 14, and
In the blade body of an electric shaver having a hat-shaped cross section, in which incisors 16 or 10 are provided on both or one of the flange portions 15, 15 or 9, 9, a reinforcing rib 22 is provided at the base portion, which continues in the diagonal direction thereof. An electric razor blade characterized by: