Cutting blade, and cutting set comprising a cutting blade
The cutting blade with slots between teeth addresses the issue of gaps in rigidly connected cutting sets by enhancing flexibility, ensuring even contact and improved cutting performance on uneven surfaces.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- WAHL GMBH
- Filing Date
- 2025-12-22
- Publication Date
- 2026-07-02
AI Technical Summary
Existing cutting sets with rigidly connected cutting teeth require high manufacturing standards for flatness and cutting pressure to minimize gaps, leading to issues like hair being pushed out or trapped, preventing cutting, especially on uneven surfaces.
A cutting blade with slots between teeth, allowing for increased flexibility and spring action, enabling better conformation to uneven surfaces and reducing gaps by individually or collectively connecting teeth to a stationary blade.
The solution minimizes shear gaps without increasing cutting pressure, ensuring even tooth contact and reducing defects like hair being pushed out or trapped, enhancing cutting performance on uneven surfaces.
Smart Images
Figure EP2025088671_02072026_PF_FP_ABST
Abstract
Description
[0001] Stolmär & Partner 1 22 December 2025 40604- WH LP- WO
[0002] Cutting blade and cutting set with cutting blade
[0003] Field of invention
[0004] The invention relates to a cutting blade with a slot between tooth elements and a cutting set with such a cutting blade.
[0005] State of the art
[0006] Currently known cutting sets feature cutting teeth of both the stationary cutting blade (shearing comb) and the movable cutting blade (shearing knife) that are rigidly connected. To achieve good cutting performance, all teeth of the cutting blades must be in close contact. This requires high standards of flatness during manufacturing. Furthermore, the two blades in the cutting set are pressed together with a cutting pressure to minimize any gap.
[0007] If the flatness of the clipper blade or comb is greater than the cutting pressure can compensate for, a gap will form. This can lead to the hair not being cut, but rather being pushed out of the cutting zone, or in the worst case, the hair being trapped between the clipper blade and comb. This can prevent any cutting from taking place at all.
[0008] Description of the invention
[0009] The object of the invention is to provide a cutting knife in which the shear gap is minimized without having to increase the cutting pressure.
[0010] This problem is solved by a cutting blade according to claim 1. Further features that elaborate the invention are contained in the dependent claims.
[0011] A movable cutting blade according to the invention for a cutting set for a hair clipper comprises a plate-shaped mounting section, which is designed for attaching the cutting blade to a cutting set carrier, and a cutting section on which a cutting edge with a plurality of teeth is formed, wherein two teeth each terminate at a, in particular rounded, tooth base, wherein at least between several groups of teeth or teeth a slot is provided which extends from the tooth base towards the mounting section, in particular such that the teeth adjacent to the slot have a cutting section and a spring section adjacent to the slot. A group of teeth can comprise 2, 3, 4, 5 or even more teeth. The slot allows the Stolmär & Partner 2 22 December 2025 40604- WH LP- WO
[0012] The spring stiffness of the teeth is reduced, or the flexibility of the teeth or tooth groups is increased, allowing the cutting blade to be pressed more firmly against the stationary cutting blade of the cutting set and reducing the gap between the overlapping cutting blades. In this way, the teeth of the shear blade can be individually or collectively connected by a spring mechanism, enabling them to conform to the uneven surface of the shear comb. This better compensates for depressions in the cutting area of the shear comb, resulting in more even tooth contact. The previously described defects can thus be reduced. To create individually spring-loaded cutting teeth, it is sufficient to introduce slots at the base of the teeth, creating spring arms.
[0013] The side walls of the slot are preferably parallel to each other up to the end of the slot. Preferably, the fastening section extends in a width and length direction and is spaced vertically from the cutting section, with at least several of the slots, in particular all slots, extending into the fastening section. This allows the spring action to extend into the raised fastening section and improves the clamping force.
[0014] For the invention to function, very narrow slots (e.g., by laser cutting) or even slots with a width of almost zero (e.g., by punching the teeth) are conceivable. However, the slots preferably have a width of at least 10 pm, preferably at least 20 pm, 50 pm, 90 pm or 100 pm and at most 500 pm, 200 pm, 150 pm, 110 pm or 100 pm.
[0015] Ideally, the ends of the slots are rounded or even circular, with the circle having a larger diameter than the slot width. This prevents the slot ends from being sharp-edged and reduces stress concentrations in the material, which are mainly caused by the lateral stress from cutting.
[0016] The slots are preferably formed between all adjacent teeth of the cutting edge. This optimizes the spring action for the entire cutting edge.
[0017] Preferably, the slots in an outer area of the cutting blade are longer than the slots in a central area. This applies particularly to a cutting blade that has a concave flatness towards the bottom.
[0018] The fastening section preferably includes a recess for receiving a motion transmission device, and the slots do not extend into Stolmär & Partner 3 22 December 2025 40604- WH LP- WO
[0019] This recess. Preferably, the slots end at a distance of at least 2 mm from the recess. This ensures the stability of the cutting blade and prevents damage to the cutting blade, e.g., from breakage.
[0020] The slots preferably extend at least 2 mm, more preferably at least 4, 6 or 8 mm, and at most 10 mm or 8 mm in the direction of the fastening section.
[0021] A moving cutting blade according to the invention can be used in a cutting set for a hair clipper, wherein the cutting set further comprises a stationary cutting blade which does not move relative to the hair clipper when the cutting set is in use, and a fastening mechanism which movably attaches the cutting blade to the stationary cutting blade.
[0022] In such a cutting set, the cutting blade is pre-tensioned at the cutting edge in the direction of the stationary cutting blade, specifically with a force of 2 to 30 Newtons. The 30 N value is advantageous, for example, in animal applications with a very wide cutting comb. Accordingly, the dimensions for large animal cutting sets are scaled up.
[0023] Brief description of the characters
[0024] Figure 1 shows a moving cutting blade according to the invention in an isometric perspective from below;
[0025] Figure 2 shows the cutting blade from Figure 1 in a side view;
[0026] Figure 3 shows the cutting blade from Figure 1 in a front view;
[0027] Figure 4a shows the cutting blade from Figure 1 in a top view; and
[0028] Figure 4b shows a section of Figure 4a in an enlarged view.
[0029] Description of preferred embodiments
[0030] Figure 1 shows a moving cutting blade 10 according to the invention in an isometric perspective. The moving cutting blade 10 is the cutting blade that is moved in a blade set with respect to the main body of a hair cutting device, while the stationary cutting blade is fixed to the hair cutting device.
[0031] Figure 1 shows the moving cutting blade 10 in an isometric view from below, facing the stationary cutting blade. At the front of the Stolmär & Partner 4 22 December 2025 40604- WH LP- WO
[0032] The cutting blade 10 is formed by a shearing comb 12, which has a plurality of teeth 20. Between individual or preferably all of these teeth, a slot 30 extends at the base 22 of the spaces away from the teeth in the direction of a fastening section 14.
[0033] The base 22 of the tooth 20 is typically located where the cutting edge of the individual teeth ends or where the imaginary extensions of the teeth meet. From this point, the slot 30, preferably equipped with parallel side walls, is provided in the moving cutting blade 10.
[0034] The cutting blade 10 further comprises a mounting section 16, which is preferably offset in the vertical direction z (see Figure 2) with respect to the shearing comb 12. The mounting section 16 has one or more bores 17 for attaching the moving cutting blade 10 to the stationary cutting blade. This is done via mounting pins. A recess 15 is also provided in the mounting section 16, which serves to receive a transmission element for transmitting the movement of a drive motor to the moving cutting blade 10.
[0035] At the rear end of the moving cutting blade 10, two support elements 18 are provided, which are arranged on both sides of a raised, rearwardly projecting section 19 of the mounting section 16 and which lie at the same height level as the shearing comb 12. The support elements 18 then rest on the stationary cutting blade and hold the moving cutting blade 10.
[0036] Figure 2 shows the moving cutting blade 10 from the side. The inclination 24 of the individual cutting blade teeth 20 is more clearly visible in Figure 2, as is the uniform height of the support elements 18 with a support section 21 behind the teeth 20 of the shearing comb 12. Figure 2 also shows a coordinate system in which X represents the width of the cutting blade 10, y the length, and z the height (thickness of the cutting blade). The cutting edge is formed at the edge between the side surface 26 and the underside of the tooth 20.
[0037] Figure 3 shows the moving cutting blade 10 from the front, where the shearing comb 12 is located. Here, the individual teeth 20 are arranged side by side. From the front, one can see the inclined front surface 24 and the slot 30 that separates the teeth 20.
[0038] Figure 4a shows a top view of the moving cutting blade 10. From above, it can be seen that the sides of a tooth 20 meet the inclined front face 24. Stolmär & Partner 5 22 December 2025 40604- WH LP- WO
[0039] The tooth 20 tapers towards the front (in the y-direction). Figure 4b shows an enlarged section of Figure 4a.
[0040] As already described, the slots 30 extend from the base between the teeth towards the fastening section 14. The slots 30 preferably extend into the raised area of the fastening section 14, in particular all slots 30. More preferably, the slots in the outer areas are longer than those in the middle, in particular by 1 to 6 mm. In a preferred embodiment, this means that on both sides, the outer 5 to 15 slots 30, and more preferably 7 to 11 slots 30, are longer than the middle slots 30.
[0041] The slots 30 are particularly parallel to each other and, in a top view, also have essentially parallel slot walls. The slots 30 are preferably closed with a radius, so that the base 32 is rounded. In Figure 4b, a dashed circular recess 34 is also indicated, which the base 32 can be. The figures show an embodiment in which a slot 30 is formed between each of the adjacent teeth 20. However, it is sufficient that the slots are formed only between groups of teeth, wherein the groups of teeth consist of, for example, 10, 5, or another number of teeth 20. A mixture of groups of teeth with a different number of teeth and / or with individual teeth is also possible. The groups of teeth or teeth 20 separated by the slots 30 have a lower spring stiffness and are therefore easier to bend.Therefore, they can be pressed against the stationary cutting blade with greater force without causing increased wear. The more slots are incorporated into the moving cutting blade, the more flexible the individual teeth and tooth groups become, and the better they can be pressed against the lower cutting blade to keep the gap as small as possible during cutting.
[0042] Reference symbol list
[0043] 10 moving cutting blades
[0044] 12 cutting edges
[0045] 15 recess
[0046] 16 Fastening section
[0047] 17 bore
[0048] 18 support elements
[0049] 19 rear section
[0050] 20 ZahnStolmär & Partner 6 22 December 2025
[0051] 40604- WH LP- WO
[0052] 22 Tooth base
[0053] 24 inclined front 26 tooth side
[0054] 30 slots
[0055] 32 slotted floor
[0056] 34 circular recesses
Claims
Stolmär & Partner 7 22 December 2025 40604- WH LP- WO Patent claims 1. Cutting blade (10) for a cutting set for a hair clipper, comprising a plate-shaped attachment section (16) designed for attaching the cutting blade (10) to a cutting set on a cutting set carrier, and a cutting edge (12) with a plurality of teeth (20), wherein a cutting edge of the teeth terminates at a tooth base, characterized by the fact that at least between several groups of teeth or teeth (20) a slot (30) is provided which extends from the tooth base (32) in the direction of the fastening section (16).
2. Cutting blade (10) according to claim 1, wherein the fastening section (16) extends in a width and length direction and is spaced apart in the height direction from the cutting section, wherein at least several of the slots extend into the fastening section.
3. Cutting blade (10) according to one of the preceding claims, wherein the slots (30) have a width of at least 10 m and at most 500 pm.
4. Cutting blade (10) according to one of the preceding claims, wherein the slots (30) are formed between each pair of teeth of the cutting edge.
5. Cutting blade (10) according to one of the preceding claims, wherein the slots (30) in an outer area of the cutting blade (10) are longer than the slots (30) in a central area.
6. Cutting blade (10) according to one of the preceding claims, wherein the slots (30) extend at least 1 mm and at most 6 mm in the direction of the fastening section.
7. Cutting set for a hair clipper with a cutting blade according to one of the preceding claims, further comprising a stationary cutting blade which does not move relative to the hair clipper during use of the cutting set, and a fastening mechanism which movably attaches the moving cutting blade (10) to the stationary cutting blade. Stolmär & Partner 8 22 December 2025 40604- WH LP- WO 8. Cutting set according to one of the preceding claims, wherein the cutting blade is biased at the cutting edge in the direction of the stationary cutting blade.