Stationary Clipper Blade with Skin-Guard Tooth Protrusions

The problem

When an electric hair clipper runs over the scalp, the stationary blade sits directly against the skin. If the cutting teeth are as thick as the base plate, they tend to push hair aside rather than catching it cleanly, and any burr or sharp point at the tooth tip can scratch or nick the skin. According to the patent, the goal is to provide a stationary blade that improves the hair-trimming effect while protecting the user’s skin from punctures and irritation.

The solution

1. A substrate (1) forms the main body of the blade. At least one side edge carries a cutter tooth group (2) made of multiple cutting teeth (21).
2. Material removing grooves (3) are machined into the upper face, the lower face, or both faces of the substrate. Because material is taken away at the teeth, the thickness of each cutting tooth (T3) becomes smaller than the substrate thickness (T2).
3. Where the groove meets the tip of each cutting tooth, a small tooth protrusion (4) remains on the upper face, the lower face, or both. These protrusions act as physical guards.
4. The patent describes the protrusions as designed to prevent the sharp tips from stabbing the skin, while also functioning like a comb during trimming.

Who it is for

• Professional clipper brands looking to upgrade their replacement blade lineup with a design that reduces scalp irritation for barbers working all day.
• Consumer grooming appliance makers who want a safer blade for home-use hair clippers, especially models marketed for children or sensitive skin.
• Pet grooming tool manufacturers needing a blade that cuts close to animal skin without nicking, where thin teeth and guard protrusions offer a clear advantage.
• Aftermarket blade suppliers selling replacement heads for popular clipper models, seeking a differentiated feature to justify a premium price point.

How it works

The main parts

Manufacturing and assembly steps

1. Stamping the outer groove - A punch press forms the material removing groove (3) on the outer surface of the substrate (1) in one stroke.
2. Grinding the inner groove - A grinding wheel removes material from the inner surface to further thin the cutting teeth (21) to the target thickness (T3).
3. Cutting the teeth - A tooth-cutting grinding wheel slices the edge of the substrate to separate individual cutting teeth (21), leaving the upper tooth protrusions (41) intact inside the stamped groove.
4. Smoothing transitions - The joints where the upper protrusions (41) and lower protrusions (42) meet the cutting teeth are finished with smooth, rounded transitions.
5. Assembly - The finished stationary blade is paired with a moving blade that oscillates back and forth across it inside the clipper housing.

Applications

Professional barber fades

Barbers run clippers over the same area repeatedly. The patent describes the upper tooth protrusions as designed to stimulate the scalp nerves and accelerate blood circulation, producing a more comfortable sensation during long fading sessions. Thinner teeth catch short hairs more easily.

Children’s home haircuts

Parents using clippers on young children worry about nicks. The upper protrusions sit between the sharp tooth tips and the scalp, acting as a physical barrier. This makes the blade forgiving even if the user presses too hard or moves at an awkward angle.

Pet grooming salons

Animal skin is loose and easily caught between standard clipper teeth. The lower tooth protrusions described in the patent prevent the moving blade from cutting the skin when it swings back and forth. The thinner teeth slice through dense undercoats with less pulling.

Sensitive-skin consumer trimmers

Users with eczema or easily irritated scalps often avoid close-cutting clippers. The combination of thin teeth for a clean cut and guard protrusions for skin protection addresses this specific pain point, allowing a close trim without direct blade-to-skin scraping.

Beard and body grooming attachments

While primarily designed for head hair, the geometry applies to body groomers where skin safety is paramount. The curved substrate option mentioned in the claims allows the blade to follow body contours better than a flat plate.

Where it is less suitable

• Heavy-duty livestock shearing - sheep and cattle shears require much thicker, wider-spaced teeth to handle dirty, matted wool; thin teeth would bend or break.
• Zero-gap balding clippers - some barbers file the guard off entirely to achieve a completely flush shave; this blade relies on the protrusions for its safety function, so removing them defeats the design.
• Ceramic-only blades - the patent specifies stamping and grinding, which are metalworking processes; ceramic blades require sintering and diamond grinding, making this specific groove-and-protrusion geometry harder to replicate in pure ceramic.