Foil Shaver Head with Arc-Shaped Stationary Knife and Spring-Clamped Moving Blade

The problem

Standard foil shaver heads often use separate frames or complex plastic cages to hold the outer screen and apply pressure to the inner cutter. This adds parts, increases assembly time, and can lead to uneven pressure if components wear or shift. When the moving blade does not sit flush against the stationary foil across its entire width, hair pulls instead of cutting cleanly. Furthermore, attaching and detaching the head for cleaning requires precise alignment, and users frequently struggle with mechanisms that bind or fail to seat properly. A simpler structure that maintains consistent blade pressure while allowing quick removal addresses these daily maintenance issues.

The solution

This razor head simplifies the assembly by integrating the mounting and tensioning functions directly into the stationary knife.

1. The stationary knife (1) has an arc-shaped upper surface that extends to both sides, forming a working edge. Downward-extending stationary knife supports (11) at both ends serve as the structural frame.
2. Two stage clips (3) are welded directly to these supports. These spring clips press the moving knife (2) upward against the stationary knife, eliminating the need for a separate plastic cage or external springs.
3. Evenly spaced stationary knife cutter teeth (12) form V-shaped grooves to catch hair, while matching moving knife cutter teeth (21) shear it as the blade oscillates.
4. A central fork slot (22) on the lower surface of the moving knife snaps directly onto an eccentric shaft (44) in the shaver body, transferring motor power without intermediate linkages.
5. Circular block button holes (111) on the supports engage a buckle (41) connected to a spring (42) in the fuselage (4), securing the head while allowing it to pivot and detach easily.

Who it is for

• Electric shaver brands looking for a straightforward foil-head mechanism that reduces part count and simplifies assembly lines.
• Private-label personal care companies sourcing replacement heads or complete shavers for retail channels, needing a reliable snap-on design.
• Hotel and hospitality amenity suppliers providing compact, easy-to-maintain grooming tools where users change heads infrequently but require simple operation.
• Contract manufacturers of small appliances seeking documented mechanical layouts for stamping and assembling foil shaver components.

How it works

The main parts

Operating steps

1. Attachment: The user aligns the razor head over the fuselage. The circular block button holes (111) on the supports slide over the buckle (41). The spring (42) pushes the buckle outward, locking the head in place while allowing it to pivot slightly.
2. Drive engagement: As the head seats, the fork slot (22) on the moving knife (2) slides over the eccentric shaft (44) protruding from the fuselage.
3. Cutting action: The motor (43) spins the eccentric shaft. The offset of the shaft (about 0.8-1.2 mm) forces the moving knife to swing back and forth rapidly within the V-shaped grooves of the stationary knife.
4. Blade pressure: The two welded stage clips (3) constantly push the moving knife upward against the inner surface of the stationary knife, ensuring the teeth mesh tightly to shear hair caught in the V-grooves.
5. Removal: Pressing the release mechanism compresses the spring, retracting the buckle from the button holes so the head lifts off for rinsing.

Applications

Daily facial shaving

Men shaving daily need a head that cuts close without pulling. The arc-shaped stationary knife follows facial contours, while the spring clips maintain constant pressure between the blades to shear hair cleanly at the working edge.

Travel grooming kits

Travelers benefit from the snap-on attachment. The circular block button holes and spring-loaded buckle allow the head to be removed and reattached without tools, making it easier to clean and pack in small toiletry bags.

Hospitality and hotel amenities

Hotels providing electric shavers need units that guests can operate intuitively. The simple snap-fit head and straightforward oscillating mechanism reduce the chance of user error or broken parts during short stays.

Replacement head sales

Brands selling consumable replacement heads require a design that consumers can swap quickly. The fork slot engaging the eccentric shaft and the button-hole latch make changing worn foils a single-step process.

Where it is less suitable

• Rotary shaver designs - this patent covers a reciprocating foil mechanism; it does not apply to multi-head rotary systems.
• Wet/dry fully sealed submersible shavers - the open fork slot and spring clip arrangement described here may require additional sealing engineering for full waterproof ratings.
• Heavy-duty beard trimmers - the tooth geometry and foil thickness are designed for close shaving rather than cutting long, thick bulk hair.