JPH06502332A - safety razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Safety razor The present invention is configured such that the flexible razor blade unit can flex during use. It has a flexible razor blade unit secured to the handle by means of a Regarding safety razors.

The blade unit adjusts the blade plane and flatness depending on the forces encountered during normal use. easily deflectable about an axis extending parallel to the blade and substantially perpendicular to the cutting edge of the blade. It is flexible in the sense that it can be done. This type of safety razor is known, for example, from a British patent. It is described in Specifications Nos. 15119591 and 2119690.

One form of a blade unit for such a safety razor is a single flexible blade. These blades have two flexible blades with a flexible spacer between them. The blade or spacer consists of a comb-shaped guard part and a comb-shaped cap part. The teeth on the two combs are flexible and are attached to a molded plastic housing. interconnected by webs thin enough to be flexible. The blade unit is Razor handle with coupling means that allows the blade unit to flex during use is connected to.

The inventor has developed such an improvement to safety razors.

Improved safety razors use structural polymers such as polyethylene oxide and polystyrene. A comb-shaped molded product made of a mixture of The polyethylene oxide-containing molded product is The teeth are narrower than the spacing between the teeth on the cap.

According to the invention, depending on the forces encountered during normal use, the and can be easily deflected about an axis extending substantially perpendicular to the cutting edge of the blade. the razor blade unit, the handle, and the blade unit connected to the handle. and a connecting means that allows the blade unit to flex. is a molded plastic housing that constitutes the comb-shaped guard part and the comb-shaped cap part. and a two-blade blade with a blade or spacer between the comb-like parts. The teeth of the two comb-like parts are thin enough to allow the blade to be clamped and the teeth of the two comb-like parts to be flexible. Interconnected by webs, the blade units are made of polyethylene oxide and structural polymers It further has a comb-shaped molded product made of a mixture of The molded product containing polyethylene oxide has a blade unit with a concave shape. A safety razor that is narrower than the spacing between the teeth in the cap portion so that it can flex. is provided.

The teeth of the polyethylene oxide-containing molded product are at the same height as the teeth of the cap part, or protrudes above the teeth of the cap part.

Shave inserts made of structural polymers such as polyethylene oxide and polystyrene. Used on the cap and/or guard of swords and blade units to improve shaving properties. It is well known, for example, in British Patent Specification No. 2024082 Are listed. Such inserts are typically made of 80% by weight polyethylene oxide. and 20% by weight of structural polymer. This invention contains polyethylene oxide Provides a particularly convenient method of incorporating inserts into flexible blade units of the type described above do.

Preferred embodiments of the invention will be described by way of example below with reference to the accompanying drawings, in which: FIG.

FIG. 1 is an exploded perspective view of the razor; FIG. 2 is a perspective view of the assembled razor.

The illustrated razor includes a comb-shaped guard portion 12 and a comb-shaped cap portion 13, and includes a spacer. These parts consist of a combination of two single-edged razor blades 14 with a razor blade 15 in between. Molded plastic housing (e.g. made of polystyrene), clamped for minutes The flexible blade unit 10 has a flexible blade unit 10 having a rod 11. Blade 14 and spacer 15 engages a protrusion (not shown) in the housing and a slot 16 in the blade. It is held in the correct position by the protrusion (not shown) of the spacer 15. slot The slot 16 is used to allow relative movement of the blade and slot during deflection. It will be done. The comb portions 12 and 13 are such that the blade unit 10 is flexible. They are interconnected by webs 17 that are thin enough to do so.

The blade unit further includes a comb-shaped molded product 18 containing polyethylene oxide. The teeth 19 of the molding are positioned between the teeth of the cap portion 13, the width of one tooth being: In order for the blade unit to be able to flex in a concave shape (the blade unit is (when not) is less than the gap between the teeth of the cap part.

The teeth 19 of the polyethylene oxide-containing molded product 18 are fixed to the rear of the web 17 with adhesive. They are interconnected by webs 20 that are woven together. As shown in Figure 2, the assembly In the upright state, the teeth 19 of the polyethylene oxide-containing molded product 18 are located on the cap portion. It will be at the same height as tooth 13.

1 and 2 further illustrate the preferred method of assembling the blade unit. It is. That is, the molded product 18 containing polyethylene oxide is It is separated from the sprue 21 molded together with this molded product until it is joined to the sprue 11. First, this sprue 21 is cut out following connection to the housing 1 (see Fig. 2). reference).

The blade unit 10 is composed of three columnar parts that hang down integrally from the lower side of the housing 11. It is connected to the handle 22 by members 23,24. The columnar member is located at the bottom of the handle. slidingly engages a corresponding slot 25,26 in the pad.

The columnar members 23,24 extend perpendicularly to the parallel planes of the blade and are located directly at the edge of the blade. passing through the area positioned below, i.e. bounded by the edge of the blade. Ru. The central column member 24 is guided for straight sliding movement within the slot 26. Therefore, this columnar member can move the unit without interfering with the deflection of the unit. Center longitudinally. The outer columnar member 23 is aligned with the deflection axis of the blade unit. Each has a pivoting pin 27 projecting through these members in parallel; 7 is a blade that accompanies the movement of the ends of the unit toward or away from each other; An elongated slot formed in the wall of the slot 25 to accommodate the deflection of the unit. is received and guided by the port 28. Furthermore, the bin 27 has a blade unit. Avoid being pulled out of the handle.

The columnar member 23 is such that one end or both ends of the unit are subjected to a larger force than the middle portion during shaving. of the unit so that the blade unit can flex convexly when encountered. It is set at a predetermined location from the end.

Damage to the blade unit due to excessive deflection in both concave and convex conditions both in the center and at the ends of the cartridge to protect against It was found that it was necessary to limit the deflection.

In the concave state, the deflection from the undeflected plane will cause the bottom of the platform to limited by meeting the center of the head of the tile. In the convex state, the blade The deflection of the outer part of the unit is such that the lower part of the outer part of the platform is at the head of the handle. limited by abutting the outside portion.

In certain embodiments, the concave deflection is limited to 2.5nlIn at the center of the blade unit. convex deflection is limited to 3 mm at the end of the blade unit. outer columnar part The spacing between the members 23 is preferably 2/3 of the total length of the blade unit.

The main forces encountered during shaving are directed perpendicular to the plane of the blade and are through the area bounded by the cutting edge of the board unit. Column member 23.2 4 is consistent with these forces, resulting in large bending moments in these columnar members. is never added. If the columnar members 23.24 are not aligned with these forces. In this case, the columnar member is tilted due to the bending moment, and the bin 27 is inserted into the guide slot 28. pressed against.

A polyethylene oxide-containing molded product is formed separately from the housing 11, and the housing 11 Although we explained an example in which polyethylene oxide-containing molded products were bonded with adhesive, In particular, one material is first formed and then a second material is added to it. By forming different materials into a single component by in-situ forming. You can do it on the spot. This method consists of a housing and a polyethylene oxide-containing component. Can be used to form shaped articles as a single component. (cap teeth and poly Polyethylene oxide is used to create the desired gap between the teeth of the molded product containing ethylene oxide. A spacer part is inserted into the mold prior to injection of the resin-containing mixture. ) This allows you to The use of adhesive eliminates the need for adhesive bonding and increases the unit's performance. Flexibility decreases.

Claims (2)

[Claims] 1. parallel to the plane of the blade and depending on the forces encountered during normal use. A razor blade that can be easily deflected about an axis extending approximately perpendicular to the cutting edge of the blade. A blade unit, a handle, and a blade that connects the blade unit to the handle. The blade unit has a comb-shaped garter. It has a molded plastic housing that forms the front part and the comb-like cap part. A double-edged blade with a blade or spacer between the comb-like parts is clamped. and the teeth of the two combs are intertwined with a web thin enough to be delimitable. The connected blade units are made of a mixture of polyethylene oxide and structural polymers. It further has a comb-shaped molded part that is positioned between the teeth of the comb-shaped cap part. molded products containing polyethylene oxide, the blade unit can bend in a concave shape. A safety razor whose width is narrower than the gap between the teeth in the cap part so that it can be cut. 2. Are the teeth of the molded product containing polyethylene oxide the same height as the teeth of the cap part? 2. A safety razor according to claim 1, which alternatively projects over the teeth of the cap portion.