Cutlery – Cutting tools – Plural cooperating blades
Patent
1995-04-04
1997-05-13
Payer, Hwei-Siu
Cutlery
Cutting tools
Plural cooperating blades
30266, 384607, 384614, B26B 1328
Patent
active
056281161
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a bearing usable for scissors and scissors using the same.
BACKGROUND ART
Generally, a pair of scissors is required to have excellent rotatability and durability. Therefore, especially, a pair of scissors to be used in a barber-beautyparlor field has conventionally been known, in which groove parts are respectively formed on contacting surfaces of a moving blade and a stationary blade to mate with each other; and these groove parts are pivotally connected to each other by using a spindle pin and a set screw under a condition where a bearing, which holds a plurality of steel balls, is sandwiched therebetween. That is, according to the pair of scissors, an excellent rotational movement of the moving blade and the stationary blade can be maintained due to smooth rotational movement of the steel balls held by the bearing.
However, according to such a pair of scissors, chips of cut hair and dusts are likely to enter between the bearing and the steel ball through long use; and this disadvantageously hinders the smooth rotational movement of the steel balls.
In addition, once such chips enter, they become very hard to be removed, and consequently, the bearing is required to be replaced with a new one, thereby raising a problem of high maintenance cost or the like.
The present invention, which is made considering such disadvantages of prior art, has an object to provide a pair of scissors capable of maintaining the smooth rotational movement for a long time by means of preventing entrance of chips and/or dusts.
DISCLOSURE OF INVENTION
A bearing usable for scissors according to the present invention, including a disk-shaped holding plate and a plurality of steel balls, the holding plate having front and rear sides, and an aperture at the central thereof, through which a spindle pin of the scissors pierces. A plurality of steel ball holding apertures are annularly arranged around the above aperture, for rotatably holding the above steel balls under a condition where the spherical surface of each steel ball, is projected beyond either side of the holding plate. The steel balls are held in the steel ball holding apertures one by one. At a peripheral edge portion of each steel ball holding aperture on either side of the holding plate, and at an outer peripheral edge portion of the holding plate, a foreign material blocking barrier is formed taken along the respective entire peripheral edge portions so as to each have a height lower than the height of the projecting portion of each steel ball. Therefore, chips, dusts, and the like entering around the bearing will have difficulty to further enter the steel ball holding aperture of the holding plate due to the presence of the foreign material blocking barriers. Thus, the function of the bearing can be maintained for a long period. In addition, with such a simple structure, a working system such as an assembly or disassembly step for scissors would not become complicated, and the manufacturing cost can be held down, thereby making it possible to provide a pair of scissors easy to handle and economic.
Furthermore, according to a pair of scissors of the present invention, the thus constructed bearing is provided so as to be sandwiched by the contacting surfaces of the blades. Therefore, the pair of scissors can maintain excellent rotatability of a moving blade and a stationary blade for a long time. In addition, the pair of scissors need not be frequently cared, and inferiority of the bearing due to entrance of chips can be prevented, thereby reducing the maintenance cost.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is an exploded perspective view showing a bearing usable for scissors, and a pair of hair cutting scissors according to the present invention;
FIG. 2(a) is a front view showing a bearing usable for scissors according to the present invention;
FIG. 2(b) is a cross-sectional view taken along a line II to II of FIG. 2 (a);
FIG. 3(a) is a plan view illustrating another example of an arc-shaped plate spring to be use
REFERENCES:
patent: 672050 (1901-04-01), Williamson
patent: 2032281 (1936-02-01), Haywood
patent: 2307489 (1943-01-01), Coats
patent: 3611570 (1971-10-01), Laurenti
patent: 4120543 (1978-10-01), Greene, Jr. et al.
patent: 4541744 (1985-09-01), Lederman
patent: 5263779 (1993-11-01), Sakaguchi et al.
Kabushiki Kaisha Naruto
Payer Hwei-Siu
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