Shaver head assembly based on rear-grabbing and front-cutting principle and shaving device

Abstract

The invention discloses a shaver head assembly with high safety. The assembly includes at least one shaving unit, each having a fixed cutting blade located at a forward most side and a gripping member located at a rearward side. During use, the whole tool bit moves in the direction (V1) forming an obtuse angle with the direction of the cutting edge, so that the cutting blade safely slides over the skin in advance; the grabbing component then captures the beard from the rear and actively guides the beard forwards to the crossed blade cutting edge to complete cutting. According to the method, the working logic of'safety first operation, back grasping and front cutting 'is achieved, the risk that a cutting edge makes direct contact with the skin to cause cutting injury is eliminated in principle, and meanwhile the effect of face shaving is achieved.

Description

Technical Field

[0001] This invention relates to the field of personal care electrical appliances, specifically to a shaving head assembly for a shaving device, and more particularly to a shaving head assembly that combines high safety with high shaving performance. Background Technology

[0002] Currently, shaving products on the market are mainly divided into two categories: electric shavers and manual shavers. These two types of products usually cannot achieve the same balance in terms of safety, shaving cleanliness, and user experience.

[0003] Electric shavers (including rotary and reciprocating types) typically use a metal mesh (foil) to cover the high-speed moving blades. This mesh acts as a physical barrier, preventing direct skin contact with the blades and providing basic safety. However, this design also introduces some inherent limitations: First, hairs must pass through the holes in the mesh to be cut by the internal moving blades, which may make it difficult to effectively capture some hairs that are close to the skin or growing at an angle. Second, for safety reasons, a certain gap usually needs to be maintained between the mesh surface and the skin, resulting in a distance between the cutting plane and the skin surface, which may affect the close shave. Furthermore, when there are raised areas on the skin (such as pimples or moles), the moving blades may still come into contact with them through the mesh, posing a risk of pulling or injury. Therefore, there is a certain constraint between "safety protection" and "shaving efficiency" in the structure of electric shavers.

[0004] Manual razors (such as safety razors and straight razors) use exposed, sharp blades to directly shave the beard, achieving a very close shave. However, since the blades are in direct contact with the skin while cutting the beard, they require a high level of skill, angle control, and even pressure from the user, posing a higher risk of cuts and nicks. Furthermore, manual shaving usually requires the use of shaving cream or other lubricating products, and the blades are relatively inconvenient to maintain and carry.

[0005] In summary, current technologies have not yet effectively resolved the long-standing technical contradiction of achieving extremely high shaving closeness while ensuring zero risk of skin cutting. Therefore, it is necessary to innovate at the working principle level and propose a shaving solution that can balance inherent safety and shaving effect. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to overcome the shortcomings of existing shaving technology that cannot simultaneously achieve both safety (cut prevention) and shaving cleanliness (close shave effect), and to provide a razor head assembly with a completely different working principle that can simultaneously achieve zero risk of skin cuts and high close shave cleanliness.

[0007] The technical solution of the present invention is as follows: A razor head assembly is provided, including at least one shaving unit. Each shaving unit includes: • A fixed cutting blade: It has a sharp cutting edge and is fixedly installed at the front of the shaving direction.

[0008] • A gripping component: located on the rear side of the fixed cutting blade in the shaving direction. The working surface of the gripping component is configured with a blunt or adhesive structure sufficient to hook or adhere to the beard, but insufficient to cut the skin or beard.

[0009] The core working logic of the shaver head assembly is as follows: during use, the assembly moves along the shaving direction (V1), and this direction of movement (V1) forms an angle (α) greater than 90 degrees with the direction of the sharp edge of the fixed cutting blade. This causes the blade to first glide across the skin surface in a "sweeping" posture without performing a cutting action.

[0010] Following this, the rear-mounted grasping component begins its work, capturing and lifting (or adhering to) the beard hairs that have been crossed by the blade but not yet processed, from the root. Through its own movement (rotation or reciprocating), the grasping component actively guides and delivers the captured beard hairs to a crucial "cutting safety zone"—the location of the fixed cutting blade's edge, which has safely crossed the skin. Only then does the sharp blade complete the cut of the beard in a rear area completely free of skin contact risk.

[0011] The beneficial effects of this invention are as follows: (1) Intrinsic safety: Through the timing design of "passing through first, then cutting", the only sharp cutting action is completely separated from the time and space of contact with the skin. When the cutting occurs, the blade is already behind the skin, which completely eliminates any possibility of the blade cutting the skin from a physical principle.

[0012] (2) Extremely high shaving precision: The independent gripping component can effectively "lift" or "stick" the beard close to the skin or even lying flat from behind, overcoming the problem of low capture rate caused by the mesh obstruction and the distance between the skin in traditional mesh shavers. After the beard is lifted, it is precisely guided to the sharp fixed blade for cutting, achieving a close-to-the-root cutting effect similar to manual shaving.

[0013] (3) The unity of comfort and efficiency: Without relying on physical barriers that reduce efficiency (such as blade foil), safety protection and efficient cutting functions are seamlessly integrated in a single component through the precise coordination of mechanical timing and spatial position, providing users with a safe, painless and thorough shaving experience. Attached Figure Description Figure 1 This is a schematic diagram showing the angle (α) between the overall moving direction (V1) of the shaver head assembly of the present invention and the orientation of the cutting blade. Figure 2 This is a schematic cross-sectional view of the shaving unit in Embodiment 1 (rotary gripping wheel type) of the present invention; Figure 3 This is a schematic cross-sectional view of the shaving unit in Embodiment 2 (reciprocating adhesive adsorption plate type) of the present invention; Figure 4 This is a schematic diagram of the general working process of the shaver head assembly of the present invention (step AC). Detailed Implementation The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0014] Example 1: Rotary gripping wheel type like Figure 2 As shown, the shaving unit of this embodiment includes a fixed cutting blade 21 and a rotating gripping wheel 11.

[0015] The fixed cutting blade 21 is secured to the front end of the unit by a rigid bracket or blade housing, and its cutting edge is finely ground and extremely sharp. A rotating gripping wheel 11 is coaxially mounted slightly below and behind it. This gripping wheel 11 is connected to a micro motor (not shown in the figure) by a drive shaft 31. Its circumferential surface can be smooth, blunt metal or plastic, or it can be designed with tiny textured patterns or flexible protrusions to enhance its ability to hook onto the beard, but its surface does not possess cutting properties under any circumstances.

[0016] A precisely preset working gap d is maintained between the outermost edge of the gripping wheel 11 and the cutting edge area of ​​the fixed cutting blade 21. This gap d preferably ranges from 0.05 mm to 0.3 mm, for example, 0.15 mm or 0.2 mm. This gap needs to be small enough to ensure that the lifted beard can reliably enter and be cut by the blade; at the same time, it needs to be large enough to prevent interference or pinching of the skin.

[0017] During operation, the entire cutter head assembly moves along... Figure 1 The shaving direction V1 is shown, and the angle α between this direction and the forward-pointing blade is greater than 90 degrees (typically 100° to 170°). The high-speed rotating gripping wheel 11 contacts and hooks the beard from behind, using its rotational motion to "throw" the beard upward and forward, allowing it to precisely pass through the working gap d and meet the sharp edge of the fixed cutting blade 21, which has safely passed the skin at that point, thus being cleanly and neatly cut off.

[0018] Example 2: Reciprocating viscous adsorption plate like Figure 3 As shown, the shaving unit of this embodiment includes a fixed cutting blade 22 and an adhesive adsorption plate 12.

[0019] The fixed cutting blade 22 is mounted at the foremost position. Directly behind it, a parallel adhesive adsorption plate 12 is arranged. This adsorption plate 12 is connected to a high-frequency reciprocating drive mechanism 32, such as a piezoelectric ceramic actuator, a voice coil motor, or a cam-linkage mechanism driven by a micro motor.

[0020] The adhesive plate 12 has a skin-facing side coated or adhered with a layer of biocompatible adhesive material (such as hypoallergenic medical silicone pressure-sensitive adhesive) that is strong enough to hold the beard in place without causing discomfort or damage to the skin. This adhesive layer can be designed to be replaceable to maintain long-lasting adhesion.

[0021] Driven by the drive mechanism 32, the adhesive adsorption plate 12 performs high-frequency reciprocating linear motion between the working position (near the cutting blade) and the standby position (away from the cutting blade), and the preferred range of its stroke L is 0.5 mm to 3 mm, for example 1.0 mm or 1.5 mm.

[0022] The workflow is as follows: The blade moves along direction V1. When the adhesive adsorption plate 12 is in the rear "standby position," its adhesive surface contacts and adheres to the beard. Subsequently, the drive mechanism 32 quickly pushes it forward to the "working position." This forward movement delivers the adhered beard forward, allowing it to contact the sharp edge of the fixed cutting blade 22, which has already passed through this position, and complete the cut. After the cut is completed, the adsorption plate 12 quickly returns to the "standby position," and its adhesive surface can detach the beard remnants through slight vibration or material properties, preparing for the next gripping cycle.

[0023] General instructions for the work process like Figure 4 As shown, regardless of the gripping component used, the working process of this invention follows the following logical timing sequence: • Step A (Safe Pass): The blade moves, and the sharpest edge at the front first contacts and glides across the skin, but no cut is made at this time, and the beard remains intact.

[0024] • Step B (Capture and Lift): The rear gripping component (11 or 12) begins to work, hooking or sticking to the whiskers that have been passed by the blade from the root.

[0025] • Step C (Safe Cut): The gripping component guides the beard to the edge of the fixed cutting blade, which is already behind the skin, through its own movement, and the beard is cut off in this "safe zone".

[0026] Further improvements and variations Based on the principles of this invention, those skilled in the art can make several improvements and modifications: • The shaving head assembly may include multiple shaving units as described above, which may be arranged linearly, in an arc, or in a mesh matrix to adapt to different facial contours.

[0027] The power and control signals of the drive motor of the rotating gripping wheel 11 or the reciprocating drive mechanism 32 of the adhesive adsorption plate 12 can be provided by an independent power supply and control system, or they can be integrated into the shaver handle.

[0028] • The fixed cutting blade can be a single piece or a composite blade assembly composed of multiple ultra-thin blades to further improve cutting efficiency and comfort.

[0029] • The adhesive material of the adhesive adsorption plate 12 can be selected from materials with self-cleaning or oleophobic properties to reduce the influence of sebum and moisture.

[0030] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A shaving head assembly characterized by, The shaving head assembly comprises at least one shaving unit, which comprises: a fixed cutting blade with a sharp cutting edge, fixedly arranged at the most front side of the shaving unit in the shaving direction; a catching component arranged at the rear side of the fixed cutting blade in the shaving direction, configured to capture and lift the beard hair in a non-cutting manner; wherein the catching component and the fixed cutting blade are cooperatively configured such that, when the shaving head assembly as a whole moves in the shaving direction (V1), the fixed cutting blade first passes through the skin area, and then the catching component actively guides the captured beard hair to the sharp cutting edge of the fixed cutting blade that has passed through the skin area to complete the cutting; and the included angle (α) between the overall movement direction (V1) and the orientation of the sharp cutting edge is greater than 90 degrees.

2. The shaving head assembly of claim 1, wherein, The working surface of the catching component is blunt or adhesive, which is configured to have the ability to hook or adhere to the beard hair, but does not have the ability to cut the skin or the beard hair.

3. The shaving head assembly of claim 1, wherein, The catching component is configured to be able to reciprocate linearly or rotate relative to the fixed cutting blade.

4. The shaving head assembly of claim 3, wherein, When the catching component is a rotating catching wheel, its rotation axis is parallel to the skin surface, and a preset working gap (d) is provided between its circumferential surface and the edge area of the fixed cutting blade.

5. The shaving head assembly of claim 4, wherein, The working gap (d) is in the range of 0.05mm to 0.3mm.

6. The shaving head assembly of claim 3, wherein, When the catching component is an adhesive adsorption plate, it is driven by a reciprocating driving mechanism to reciprocate between a working position close to the fixed cutting blade and a standby position away from the fixed cutting blade.

7. The shaving head assembly of claim 6, wherein, The stroke (L) of the reciprocating motion is in the range of 0.5mm to 3mm.

8. The shaving head assembly of any of claims 1-7, wherein, The shaving head assembly comprises a plurality of shaving units arranged side by side.

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