RU2124982C1 - Cutting head of electric shaver - Google Patents

Abstract

FIELD: personal hygienic appliances. SUBSTANCE: this relates to appliances intended for dry shaving and can be used in electric shavers which are provided with floating blades. Cutting head has external blade made in the form of truncated cone with slots. Also provided is driving blade with rectangular slots made in its radial cross-links. Cutting members are made in the form of strips having bent cutting edge at one side and protrusions for fixing of strips at other side. Cutting members in the form of strips are inserted by their protrusions into slots in radial cross-links of driving blade. In this case, protrusion of cutting member interacts with flat spring. Limiting bar is provided with locking catch. Aforesaid embodiment of cutting head of electric dry shaver improves rigidity of external blade, also upgrades quality of shaving and ensures reliable centering of internal driving blade. EFFECT: higher efficiency. 1 cl, 7 dwg

Description

 The invention relates to cutting heads for dry shaving razors and can be used in electric shavers equipped with "floating" knives.

 Known cutting head electric razor containing mounted in the housing an external "floating" knife and an internal drive knife, and a restrictive bar with placed on it a supporting element for an internal knife made of elastic material. The inner knife is made in the form of a part with tabs that are bent in the direction of rotation at an angle to the plane of contact with the surface of the fixed knife and ground in the same plane (US 4077120 A, 03/07/78).

 Also known is a cutting head for an electric shaver containing an external “floating” knife mounted in the housing, an internal drive knife and a restrictive bar with supporting elements for an internal knife placed thereon, made of C-shaped elastic material with protrusions on one side. The inner knife is made in the form of a part with legs, which are bent in the direction of rotation at an angle to the plane of contact with the surface of the fixed knife and ground in the same plane. The outer knife is made in the form of a cap with a groove along the periphery of the bottom, which contains cutting elements in the form of radial grooves. The paws with cutting edges of the movable knife are placed in the groove of the fixed knife (cap) and are tightened using a spring-loaded drive leash (SU 821128 A, 04/15/81).

 The closest in technical essence and the achieved result is an electric shaver cutting head containing an external knife mounted in the housing, an internal drive knife made in the form of a disk with rectangular grooves for installing cutting elements in them in the form of plates with a bent cutting edge, and a limit bar for the inner knife, made in the form of a cage of a plain bearing for centering the internal drive knife (CH 554730 A, 15.10.74).

 A disadvantage of the known technical solutions is that the inner knives are a rigid part with many legs with cutting edges, which, due to the heterogeneity of the material, uneven heat treatment and machining, do not ideally lie in the same plane and are unevenly attached to the working surface of the fixed knife. During the operation of the electric razor during the running-in of the cutting edges to the surface of the fixed knife, uneven wear of the cutting edges occurs, which also leads to their loose fit to the working surface of the fixed knife. All this affects the quality and time of shaving and causes a more rapid blunting of knives.

 In addition, these are the heads of the multi-knife version of the electric shaver, since such a design does not allow the use of one large-diameter knife, which would increase the shaving area. Flat knives make shaving in the chin and neck difficult.

 The objective of the invention is the creation of a cutting head for electric shavers, providing a technical result, consisting in increasing the rigidity of the external knife and the quality of shaving, in ensuring reliable centering of the internal drive knife and simplifying the design of the cutting elements.

 This technical result is in the cutting head of an electric shaver containing an external knife mounted in the housing, an internal drive knife made in the form of a disk with rectangular grooves for installing cutting elements in the form of plates with a curved cutting edge, and a limit bar for the internal knife, made in the form sliding bearing cages for centering the inner drive knife, is achieved by the fact that the outer knife is made in the form of a truncated cone with grooves, and the rectangular grooves in the drive knife are made in its radial At the jumper, the cutting elements in the form of plates with a bent cutting edge on one side and the protrusions for their fixation on the other hand are inserted with protrusions into the grooves on the radial jumpers of the drive knife, the protrusion of the cutting element interacts with a flat spring, and the restrictive bar is made with a snap-lock.

 The cutting elements of the inner movable knife are in contact with the cutting path of the fixed knife along the generatrix of the truncated cone.

 The invention is illustrated by drawings, where in FIG. 1 is a sectional perspective view of a cutting head; in FIG. 2 is a view A in FIG. 1; in FIG. 3 0 case of the internal drive knife; in FIG. 4 - the body of the cutting head; in FIG. 5 - restrictive level; in FIG. 6 - cutting element; in FIG. 7 - a flat spring.

 In the housing 1 of the cutting head there is a fixed knife 2 in the form of a truncated cone and a movable drive knife 3. A restrictive plate 4 is fixed on the body, made in the form of a ring with radial jumpers and acting as a sleeve of a sliding bearing for centering the internal drive knife 3, which is made in the form disc with a hub. In the radial lintels of the drive knife, rectangular grooves 5 and 6 (Fig. 3) are made, into which the cutting elements 9 with bent cutting edges 10 are inserted by the protrusions 7 and 8 (Fig. 6). The protrusion 7 of the cutting element 9 interacts with a flat spring 11 installed on the hub of the movable knife 3. The spring 11 (Fig. 7) is made with petals according to the number of cutting elements. The housing 1, the movable knife 3 and the limit bar 4 can be made of plastic. The cutting elements are located radially on the jumpers of the movable knife and are in contact with the surface of the fixed knife along the generatrix of the truncated cone.

 The cutting head operates as follows.

 The movable knife 3 is driven in rotation from an electric motor (not shown in FIG.). The cutting elements 9, drawn to the fixed knife 2 by the spring 11, make circular movements along the generatrix of the truncated cone, which has cutting elements in its form in the form of grooves and a group of rectangular holes.

 The cutting head allows you to improve the quality of shaving, especially in areas in the chin and neck. This is ensured by the convex shape of the outer knife and the presence of grooves and rectangular holes on it, allowing you to cut long and short hair. Due to the convex shape of the outer knife, the cutting path of the head is increased, therefore, the shaving area is increased, and this reduces the time of shaving. Due to the centering of the movable knife, noise, braking torque and inrush current are reduced.

 This cutting head can be made industrially and used in electric shavers with individual power supply for the electric motor.

Claims (2)

 1. The cutting head of the electric shaver containing an external knife mounted in the housing, an internal drive knife, made in the form of a disk with rectangular grooves for installing cutting elements in them in the form of plates with a bent cutting edge, and a limit bar for the inner knife, made in the form of a bearing race sliding for centering the inner drive knife, characterized in that the outer knife is made in the form of a truncated cone with grooves, and the rectangular grooves in the drive knife are made in its radial jumpers, cutting ementy in the form of plates with bent cutting edge on one side and projections for their fixing projections on the other are inserted into the grooves on the radial webs of the drive blade, the projection of the cutting element interacts with a leaf spring, and restrictive strap formed with snap lock.  2. The cutting head according to claim 1, characterized in that the cutting elements of the inner movable knife are in contact with the cutting path of the fixed knife along the generatrix of the truncated cone.

Images