Patent ID: 12194647

DETAILED DESCRIPTION OF THE INVENTION

The invention will now be further described with reference to the accompanying drawings: a reciprocating razor blade cartridge as shown inFIGS.1-12comprises a fixed blade1and a fixed blade support2for supporting and fixing the fixed blade1, wherein the fixed blade1is a flexible metal sheet having flexibility, the fixed blade support2is a basin-shaped support, the fixed blade1is supported by an edge of a basin opening of the fixed blade support2, all sides of the fixed blade1are bent downwards to wrap around the fixed blade support2on the outside of a basin wall around the fixed blade support2and make a top surface of the fixed blade1and a side surface close to the top surface smoothly transition, an inner cutting cavity10is formed between the fixed blade1and the fixed blade support2, and hair inlet holes11is provided on the fixed blade1for feeding body hairs into the inner cutting cavity10; a side wall of the hair hole11forms a cutting edge, a movable blade3which can reciprocate back and forth relative to the fixed blade1so as to cut the body hair in the hair hole11is provided below the fixed blade1in the inner cutting cavity10, the movable blade3is provided with cutting teeth31corresponding to the hair inlet holes11and used for cutting body hair, and the reciprocating razor blade cartridge further comprises a transmission component4which passes through the bottom of the fixed blade support2and connects the movable blade3with a power device of the electric razor.

Since the fixed blade1is a flexible metal sheet, and by means of the support of the basin wall around the fixed blade support2, due to the flexibility and toughness of the flexible metal sheet itself, the fixed blade1can be stretched to the periphery, and under the action of a certain external force, the periphery of the fixed blade1is bent and tensioned downwards, and is adhered to the outside of the basin wall around the fixed blade support2, and the fixed blade1is tightly fixed on the basin wall of the fixed blade support2by welding or riveting, so that the top surface of the fixed blade1and the side surface close to the top surface are in a smooth transition, and the upper end of the fixed blade support2and the basin opening are wrapped from top to bottom to form a leather drum-like structure, the top surface and the side surface of the fixed blade1are the top surface and the side surface of the razor blade cartridge, smooth and in order and skin-fitting. When cutting hair, the razor blade cartridge moves against the skin with the top surface of the fixed blade1, the side surface close to the top surface, or both the top surface and the side surface at the same time, the cutting surface can be cut against the skin in all directions, with good cutting effect, and can conveniently cut some depressed pails of the body, and the contact surface with the skin is the top surface of the fixed blade1with a smooth transition, the side surface close to the top surface, or both the top surface and the side surface at the same time contact the skin, so that the razor blade cartridge can slide smoothly on the skin surface, with shaving comfort.

In addition, the fixed blade1and the fixed blade support2form a leather drum-like structure, wherein the fixed blade support2is a drum body, and the fixed blade1is a tensioned drum skin covered on the drum body, and due to the principle that the drum skin of the leather drum has a pre-tension, the fixed blade1is tightened on the fixed blade support2, so that the fixed blade1can obtain a very flat cutting working surface in contact with the movable blade3without requiring additional precision machining, and the process is simple, the machining is convenient and the part manufacturing cost is low; in addition, avoiding the rigidity requirement of the fixed blade1, the thickness of the fixed blade1can be made ultra-thin which cannot be realized by other technical structures, the thickness h of the fixed blade1can be made in the range of 0<h<0.08 mm, so that the influence of the thickness of the fixed blade1can be ignored when shaving, and the body hair can be removed once.

Rounded corners22are provided between the left and right basin walls and the front and rear basin walls of the fixed blade support2to enable the left and right basin walls and the front and rear basin walls to be connected in a smooth transition, so as to facilitate the downward bending and coating of the fixed blade1, and enable the circular arc of the periphery of the fixed blade1to transition, so as to improve the comfort of cutting.

The hair inlet holes11can be uniformly arranged on the left side of the fixed blade1, and can also be uniformly arranged on the right side of the fixed blade1, and can also be arranged on both the left and right sides of the fixed blade1, and fixed cutting teeth12are formed between two adjacent hair inlet holes11; the left and right basin walls of the fixed blade support2are provided with hair inlet grooves21corresponding to the hair inlet holes11, which can supply body discharging body hairs into and out of the inner cutting cavity10; and the hairs can be fed through the hair inlet grooves21, and after shaving is completed, the hairs can also be removed by a user. Of course, the fixed blade support2may be additionally provided with a hair removing hole23for removing the hair cut in the inner cutting cavity10, so that the hair can be more easily removed.

The top surface and the left and right side surfaces of the fixed blade1are respectively at an acute angle, and a chamfer R1with a smooth transition is formed between the top surface and the left and right side surfaces, wherein the height D of the chamfer R1is less than 1.0 mm, and the effect of guiding hair and passing hair is good and the cutting effect is improved.

The hair inlet holes11located on the left and right sides are an isthmus structure recessed inwardly from the outer side to the inner side in the left and right direction, as shown inFIG.12, the isthmus structure is composed of a continuous smooth curve, and is wide to narrow from the outer side to the middle part, and then narrow to wide from the middle part to the inner side, and the width of the outer side inlet is L1, the width of the narrowest part of the middle part is L2, and the corresponding cutting teeth31are located on the inner side of the narrowest part of the middle part; the initial position resulting from the cutting of the isthmus structure, i.e., the position of the isthmus structure corresponding to the outer edge of the cutting teeth31, and the width at the initial position resulting from the cutting is L3, satisfying the following relationship: L1>L3>L2, with 0.1 mm≤L2≤0.3 min, the entrance width is convenient for hair entry, the middle is narrow and the inner is wide, so that the hair can be prevented from coming out again after entering; at the same time, when moving to cut, the skin entering from the outer entrance can be squeezed out at the narrow position, so that the skin is prevented from contacting with the movable blade moving at a high speed at the initial position generated by cutting.

As shown inFIG.12, the depth of the isthmus structure from the narrowest part in the middle to the outer edge of the corresponding cutting teeth31is L4, and is 0.1 mm≤L4≤1 mm, so as to prevent the skin from deforming under compression, and when a part of the skin bulges to the inner side at the narrowest part in the middle, the cutting teeth31cuts the skin, preferably in the range of 0.2 mm≤L4≤0.4 mm, which not only plays a safety protection, but also can ensure that the hair is cut; the depth of the isthmus structure from the outer side entrance to the outer edge of the corresponding cutting teeth31is L5, L5≤1.2 mm, preferably in the range of L5≤1.0 mm, to ensure the depth of the hair entering to guide the hair into the cutting, while also facilitating the control of the depth of the isthmus structure to ensure the structural strength of the cutting teeth12.

The central portion of the fixed blade1may further have hair inlet holes11, and the movable blade3is correspondingly provided with cutting teeth31in the central portion so as to cut hairs in multiple directions.

The left and right basin walls and the front and rear basin walls of the fixed blade support2are of the same height at the basin opening, the top surface of the fixed blade1is a plane, and the top surface of the movable blade3is a plane cooperating with the bottom surface of the fixed blade1to achieve plane cutting, as shown inFIGS.10and11.

Of course, as shown inFIGS.8and9, the front and rear basin walls of the fixed blade support2may also be higher than the left and right basin walls, and the top portions of the front and rear basin walls are in an arc structure and smoothly transition with the left and right basin walls; the top surface of the fixed blade1is an arc surface corresponding to the front and rear basin walls; the top surface of the movable blade3is an arc surface cooperating with the bottom surface of the fixed blade1to achieve arc surface cutting; preferably, when the top surface of the fixed blade1is in an arc-shaped structure, the central portion of the fixed blade1has hair inlet holes11, and the central portion of the movable blade3has cutting teeth31correspondingly, so as to better cut the shaved hair at the depressed part of the body.

The transmission component4comprises a movable blade support41fixedly connected to the movable blade3and a driving seat42connected to the power device of the electric razor, an elastic pressing piece5capable of pressing the movable blade3against the fixed blade1is provided between the movable blade3and the fixed blade support2, and the movable blade3is pushed upwards by the elastic pressing piece5, so that the movable blade3and the fixed blade1abut and form a pre-pressure, ensuring the sharpness of the body hair removed by the reciprocating razor blade cartridge.

A sliding support block6for supporting the movable blade support41and guiding the movable blade support41to reciprocate back and forth is fixed at the bottom of the fixed blade support2, and the sliding support block6can be fixed on the fixed blade support2by means of integral injection moulding with the fixed blade support2, as shown inFIGS.8and11.

The fixed blade1and the fixed blade support2are made of a metal material capable of welding, so that the side surface of the fixed blade1bent downwards from the periphery is welded on the basin wall around the fixed blade support2.

The fixed blade support2is a basin-shaped structure with a large basin opening and a small basin bottom, and the basin walls around the fixed blade support2are retracted inwards from top to bottom with the basin opening as a base point, so that after the fixed blade1is fixed on the basin wall, the edge thereof is retracted inside under the top part of the razor blade cartridge, avoiding contact with the skin.

A method of making the reciprocating razor blade cartridge described above, which comprises the steps of:D. manufacturing a fixed blade1in an unfolded state and a fixed blade support2in a basin-shaped structure according to the design;E. connecting the movable blade3with the transmission component4and mounting same in the fixed blade support2, as shown inFIG.5, wherein the movable blade3and the movable blade support41are fixedly connected and then put into the fixed blade support2from the basin opening, and the driving seat42is connected with the movable blade support41from the through hole on the basin bottom of the fixed blade support2and then placed below the bottom of the fixed blade support2;F. stretching the fixed blade1to the periphery, taking the edge of the basin opening of the fixed blade support2as a support, bending and tensioning the periphery of the fixed blade1downwards under the action of a certain external force, sticking to the outer side of the basin wall around the fixed blade support2, and tightening and fixing the fixed blade1to the basin wall of the fixed blade support2by welding or riveting, so that the top surface of the fixed blade1and the side surface near the top surface are in a smooth transition, and wrapping the upper end of the fixed blade support2and the basin opening from top to bottom to form a leather drum structure.

In order to make the movable blade3and the fixed blade1abut and form a pre-pressure and improve the cutting sharpness, in the above-mentioned step B, an elastic pressing piece5can be installed in the fixed blade support2and arranged below the movable blade3, and the movable blade3is elastically lifted above the basin opening of the fixed blade support2by the elastic pressing piece5. Then, in step C, when the fixed blade1is wrapped around the basin opening of the fixed blade support2, when the fixed blade1is bent around, tensioned and tightened on the basin wall of the fixed blade support2, the inner side of the fixed blade1presses the movable blade3downwards against the movable blade3, and a pre-pressure is formed between the movable blade3and the fixed blade1.

The manufacturing method is simple in process and low in manufacturing cost; the top surface and the side surface near the top surface of the razor blade cartridge are formed by stretching an integral fixed blade1and then wrapping downward. The razor blade cartridge is smooth and in order and skin-fitting, and avoids the requirement for high rigidity of the fixed blade1, so that the thickness of the fixed blade1can be made ultra-thin which cannot be realized by other process structures, so that the influence of the thickness of the fixed blade1can be ignored when shaving, and the body hair can be removed once.