Distance-adjustable comb and hair cutting appliance

Abstract

The utility model relates to an adjustable pitch comb and a hair cutting appliance. An adjustable pitch comb includes a comb frame, a movable comb piece, and a movable control element. The movable comb member is arranged to move in an adjustment direction relative to the comb frame. A movable control element is mounted on the comb frame. The comb frame and the control element together form a slot and pin mechanism for converting an input movement of the control element into an adjustment movement of the movable comb member relative to the comb frame in an adjustment direction. The movable comb member and the control element together form a snap connection. The control element has a contact portion resting on the support portion of the comb frame. The contact portion and the support portion form a toothed indexing profile that includes a latch recess and opposing latch teeth. The control element and the comb frame together urge the contact portion and the support portion against each other to engage the latch teeth with the latch recesses.

Description

Technical Field

[0001] This disclosure relates to an adjustable-pitch comb for a hair cutting tool, and to a hair cutting tool provided with an adjustable-pitch comb. Background Technology

[0002] Hair cutting instruments, particularly electric hair cutting instruments, are generally known and can include trimmers, clippers, and razors. Electric hair cutting instruments may also be referred to as electric hair cutters. For example, electric hair cutting instruments can be powered by a power grid and / or an energy storage device such as a battery. Electric hair cutting instruments are commonly used to trim or remove (human) body hair, particularly facial and scalp hair, to allow for a more aesthetically pleasing appearance. Typically, electric hair cutting instruments are also used for cutting animal hair. The cutting unit of a hair cutting instrument generally comprises a pair of comb-like blades with cutting edges that slide rapidly back and forth relative to each other to cut the hair located between the teeth of the blades in a scissor-like motion.

[0003] To guide hair to the cutting unit, hair cutting instruments are typically equipped with a hair comb attached to the instrument and guiding the hair as it moves across the skin during the cutting instrument's journey through the hair. Combs used in hair cutting instruments, particularly spaced combs, can typically be arranged as attachable combs or integrally formed combs. Spaced combs generally space the blade assembly of the hair cutting instrument from the skin as the instrument moves relative to the skin in the direction of movement during operation. Therefore, spaced combs can process / cut hair to a desired length, i.e., the desired length of hair remaining at the point of processing / cutting. The advantage of using spaced combs is that uniform hair lengths, such as 1.0mm, 3.0mm, 6.0mm, 9.0mm, etc., can be obtained. Therefore, processes for particularly short haircuts, three-day beards, and similar procedures can be simplified.

[0004] US2023 / 226706A1 discloses a spacer assembly adapted to space the teeth of a support and an adjustable hair comb. The spacer assembly includes a support and a movable body housed in a first guide rail of the support. The first guide rail allows movement of the movable body in the spacer direction but restricts movement of the movable body laterally perpendicular to the spacer direction. An adjuster includes a first helical channel and a second helical channel arranged around a common point on the surface of the adjuster and respectively engaging a first tab of the support and a second tab of the movable body, such that the adjuster is rotatable about the common point. Rotation of the adjuster, under the lateral restriction of the first guide rail, drives movement of the movable body relative to the support in the spacer direction.

[0005] CN 218018630U discloses a self-locking adjustable comb cap for a hair trimmer. The adjustable comb cap includes a comb cap body and a drive assembly. The drive assembly includes an end cap for the user to apply external force. The end cap has a plurality of radial locking slots. A metal spring forming a resilient locking element is attached to the comb cap. The resilient locking spring can engage a locking slot to lock the comb cap. When the user applies external force perpendicular to the comb cap, the metal spring deforms under force and slides out of the locking slot, causing the comb cap to rotate to adjust the extension length of the comb sleeve body. Therefore, the length of the comb can be manually adjusted.

[0006] The adjustable comb design disclosed in CN 218018630U is still somewhat complex and requires a number of different parts that must fit together to ensure a range of functions. This increases manufacturing and assembly costs, while precise tolerances must be adhered to to ensure the correct operation of the adjustable comb. Utility Model Content

[0007] In view of the foregoing, the object of this disclosure is to provide an adjustable-pitch comb that is relatively easy to manufacture and assemble while still providing the necessary range of functions, including at least one of proper length adjustment, self-locking, and preferably at least one of tactile or acoustic feedback during operation. It is also desirable to provide an adjustable-pitch comb that is easy to operate and provides precise fine-tuning of the cutting length, while preferably being reliably repeatable in positioning. It is also desirable to provide a hair-cutting instrument that mates with or can mate with such an adjustable-pitch comb.

[0008] In a first aspect of this disclosure, an adjustable-pitch comb for a hair-cutting tool is provided, the adjustable-pitch comb comprising:

[0009] - Comb frame,

[0010] - The movable comb piece is arranged to move relative to the comb frame in the adjustment direction, and

[0011] -A movable control element is mounted on the comb frame.

[0012] The comb frame and the control element together form a slot and pin mechanism, which converts the input movement of the control element into an adjustable movement of the movable comb relative to the comb frame in the adjustment direction.

[0013] The comb frame and the control element are connected together by a snap-fit ​​mechanism.

[0014] The control element has a contact portion that rests on a support portion of the comb frame. The contact portion and the support portion form a toothed indexing profile, which includes a latch recess and opposing latch teeth.

[0015] The control element and the comb frame together push the contact portion and the support portion against each other so that the latch teeth engage with the latch recess.

[0016] This approach is based on the understanding that even with only three components—the comb frame, the movable comb piece, and the movable control element—the necessary functions of an adjustable-pitch comb can be reliably provided. Therefore, additional components are unnecessary. Instead, manufacturing costs and assembly workload can be reduced. When the number of components is limited, the number of contact / coupling points between them is also limited. This can have a positive impact on necessary tolerance settings, etc.

[0017] In some embodiments, the adjustable-pitch comb may provide a self-locking feature. This can be the case when the latch recess and latch teeth engage. The adjustable-pitch comb provides multiple stable relative positions between the control element and the comb frame. Therefore, there are multiple length settings corresponding to the respective positions of the movable comb members relative to the comb frame.

[0018] Adjustable movement is primarily provided by the cooperation between a control element and the comb, with the control element movably mounted to the comb frame. The locking feature is essentially provided through the cooperation between the control element and the comb frame. Furthermore, the comb and comb frame cooperate to guide the adjustable movement of the comb relative to the comb frame. Therefore, the three components—the comb frame, the comb, and the control element—can be directly coupled to each other to provide the necessary functionality of an adjustable-pitch comb. The comb is directly and functionally coupled to the comb frame (guide component) and the control element (adjustable component). The control element is directly and functionally coupled to the comb (adjustable feature) and the comb frame (locking feature).

[0019] The comb frame, comb members, and control element together form a mechanical linkage that converts an input operation (actuation of the control element relative to the comb frame) into an output movement (adjustable movement of the comb members relative to the comb frame). In some embodiments, rotary input movement is converted into linear output movement.

[0020] In some embodiments, the adjustable-pitch comb can provide useful feedback during operation, such as tactile and / or acoustic (sound) feedback, for example, by clicking when the user actuates the control element.

[0021] In some embodiments, the control element itself functions as a spring capable of storing and releasing energy. In some embodiments, the movable control element is disc-shaped. Self-locking is possible when the control element is mounted to the comb frame with a certain preload, and feedback can also be provided during operation due to the inherent elasticity / resilience of the control element.

[0022] An adjustable-pitch comb can also be called a comb assembly or comb device. An adjustable-pitch comb preferably consists of at most a comb frame, movable comb parts, and movable control elements.

[0023] In some embodiments, the adjustable-pitch comb is permanently mounted to / integrated into the hair cutting instrument. In some embodiments, the adjustable-pitch comb is an add-on unit that can be attached to a separate hair cutting instrument that is not equipped with an adjustable-pitch comb. In the latter case, the hair cutting instrument is also operable without an adjustable-pitch comb, for example, for cutting hair as short as possible.

[0024] In an exemplary embodiment, the snap-fit ​​connection between the control element and the comb frame includes a protruding snap-fit ​​post and a corresponding snap-fit ​​recess, wherein the protruding snap-fit ​​post is configured to engage in the snap-fit ​​recess to secure the control element to the comb frame.

[0025] In other words, the snap-fit ​​connection between the control element and the comb frame can be used for both installation and preloading purposes. In some embodiments, the control element must be pushed against the comb frame to engage the snap-fit ​​posts and snap-fit ​​recesses. With a forced lock between the snap-fit ​​posts and snap-fit ​​recesses, the control element can be securely mounted to the comb frame even with a certain preload force.

[0026] In some embodiments, the control element includes a convex snap-fit ​​element (e.g., a snap-fit ​​post) on its underside facing the comb frame, and the comb frame includes a concave snap-fit ​​element (e.g., a snap-fit ​​recess). In some embodiments, the snap-fit ​​post is a concentric integral part of the (rotational) control element.

[0027] In some embodiments, the snap-fit ​​connection between the control element and the comb frame is a permanent snap-fit ​​connection. This may involve the fact that separation is typically only possible by destructively removing the snap-fit ​​post from the snap-fit ​​recess. However, this should not be construed as limiting.

[0028] In another exemplary embodiment, the protruding snap-fit ​​post and snap-fit ​​recess together form a pivot support for the movement of the control element. In other words, in addition to mounting and securing features, the snap-fit ​​connection defines a control axis about which the control element can rotate relative to the comb frame.

[0029] In another exemplary embodiment, the snap-fit ​​post includes at least one protruding edge configured to engage the snap-fit ​​area of ​​the snap-fit ​​recess. This allows for form-fit / positive-fit anti-damage installation. In other words, the snap-fit ​​post may include one or more snap hooks that can engage the rear side of a collar or another undercut at the snap-fit ​​recess. Furthermore, due to the positive-fit engagement between the snap-fit ​​post and the snap-fit ​​recess, a pulling force can be applied to the control element to push it towards the snap-fit ​​recess. In this way, a preload force can be generated for the self-locking feature.

[0030] In another exemplary embodiment, the snap-fit ​​engagement between the protruding snap-fit ​​post and the corresponding snap-fit ​​recess includes preloading the control element and the comb frame to push the contact portions against the support portion. The snap-fit ​​post and the snap-fit ​​recess can be designed such that, without preloading, there will be interference (overlap in the axial direction) between at least one protruding edge of the snap-fit ​​post and the snap-fit ​​area of ​​the snap-fit ​​recess. To overcome this overlap, a certain preload must be applied to the control element in the axial direction, which is thus stored by the snap-fit ​​connection.

[0031] In another exemplary embodiment, the snap-fit ​​engagement between the protruding snap-fit ​​post and the corresponding snap-fit ​​recess includes flexing the flexure disc portion of the control element and / or flexing the flexible tabs of the comb frame. Making the coupling between the comb frame and the control element quite flexible helps to address tolerance issues during the assembly and operation of the pitch comb. Furthermore, providing tactile and / or acoustic (sound) feedback can be enhanced because a greater amount of energy can be stored and released due to the flexibility.

[0032] In the axial direction, an interference fit may exist between the control element and the comb frame. In some embodiments, the control element has a disc-shaped actuating portion that may exhibit some flexibility (e.g., spring washer or spring disc behavior), ultimately enabling a positive fit engagement between the snap-fit ​​post and the snap-fit ​​recess. Therefore, the energy stored in this way forces the contact portion of the control element and the support portion of the comb frame to abut against each other to lock the adjustable-pitch comb at a given (length) setting.

[0033] In another exemplary embodiment, the latch recess and latch teeth of the toothed indexing profile are axial locking features between the comb frame and the control element. In other words, there are no radial locking features in the circumferential region of the control element and / or the comb frame. Instead, the circumferential region of the control element can provide a gripping surface for actuating the control element. When the control element is disc-shaped, the axial locking features can be arranged on the bottom side of the control element facing the comb frame, at a distance from the control axis, where a relative locking feature is provided in the comb frame.

[0034] In another exemplary embodiment, when the contact portion and the support portion move relative to each other, the actuation control element generates at least one of tactile feedback and / or acoustic feedback. This specifically includes localized raising and lowering of the control element when the latch recess and latch teeth disengage and engage in a new relative orientation between the movable comb and the comb frame. In other words, the control element and the comb frame may together form a (mechanical) click generator that provides user feedback.

[0035] In some embodiments, the control element is preloaded and rests against the comb frame. When the adjustable-pitch comb enters a new length setting, moving (typically rotating) the control element causes the latch recess and the latch teeth to disengage and engage. The successive disengagement and engagement can generate click feedback, which can be perceived by the user as at least one of tactile or auditory feedback. In some embodiments, user feedback is generated without additional metal components such as leaf springs. Since the control element itself can be considered a spring element (spring disc), the indexed relative movement between the control element and the comb frame can be used to provide user feedback. In another exemplary embodiment, the control element is a control wheel that can rotate relative to the comb frame about a control axis, with the contact portion radially offset from the control axis. Therefore, the control element can have a fairly simple design and provide a variety of functions. The control element can also be a control disc resting on the comb frame and rotatable relative to the comb frame.

[0036] In another exemplary embodiment, the control element has a knurled outer gripping surface for actuation. The knurled outer gripping surface may be disposed on a circumferential surface to facilitate the operation of an adjustable-pitch comb. A given radius of the control element can provide an appropriate transmission ratio between the user input / actuation force and the adjustable movement, as well as locking and unlocking actions between the control element and the comb frame. The knurled outer gripping surface and the contact portion may be adjacent to each other, the contact portion being an axial (annular) feature and the knurled outer gripping surface being a radial feature.

[0037] On the top side of the control element, a length indicator for the comb with adjustable spacing can be provided. On the circumferential side of the control element, a gripping surface can be provided. A snap-fit ​​post can extend from the bottom side of the control element facing the comb frame. Furthermore, a curved groove can be formed on the bottom side of the control element, which is part of the slot and pin mechanism between the control element and the movable comb.

[0038] The control wheel can be a relatively flat control wheel, also referred to as a control disc. In some embodiments, the control element is a relatively flat portion, except for the snap-fit ​​post, which achieves a compact yet accessible design. The control element (at least its actuating portion) is easily accessible to the user.

[0039] In some embodiments, the movable comb has a base plate movably mounted to the comb frame and an inclined comb arm extending from the front end of the base plate. Furthermore, pins for a pin and slot mechanism between the movable comb and the control elements are formed at the base plate.

[0040] In some embodiments, the tilting comb arm is tilted relative to the substrate and the adjustment direction. This provides a gap between the comb arm and the substrate, which can be partially occupied by the control wheel. The tilting comb arm is arranged in such a way that it provides the minimum cutting length in the fully retracted position of the substrate relative to the comb frame and the maximum cutting length in the fully extended position of the substrate relative to the comb frame. Therefore, as the substrate is gradually withdrawn when actuated by the control element, the offset between the skin-facing side of the movable comb and the blade assembly of the cutting unit of the instrument gradually increases.

[0041] In another exemplary embodiment, a contact portion is formed in the peripheral region of the control element facing the comb frame. This spaces the contact portion sufficiently from the snap-fit ​​post, providing ample length for the desired resilient effect. In another exemplary embodiment, a support portion is formed on a raised shoulder of the comb frame. In this way, the comb frame can be relatively rigid compared to the control element, which can be disc-shaped and therefore relatively flexible. Since the necessary mechanical properties for the required preload between the control element and the comb frame are inherently provided by both elements, additional components such as metal springs, fastening components, etc., are not required.

[0042] In another exemplary embodiment, latching teeth are formed on the comb frame and evenly distributed along a support portion, forming a circular pattern extending along a circular segment. Therefore, the circular pattern can be a pattern extending along an arc (not a full circle). For example, the comb frame may have a raised shoulder comprising a circular segment of approximately 180° along which the latching teeth are distributed. Generally, the comb frame may be U-shaped in a top view, with the raised shoulder formed in the curved portion of the U-shape, and the two free ends of the legs of the U-shape pointing towards the front ends of the adjustable-pitch comb. At the opposite rear of the U-shape, a control element is supported on the raised shoulder forming the latching teeth. The movable comb frame is movably mounted between the two legs of the U-shape. In an exemplary embodiment, the comb frame is provided with a linear guide for the movable comb.

[0043] In an exemplary embodiment, three latching teeth are distributed along the support portion. For example, the three latching teeth are evenly distributed along a circular portion not exceeding 180°. A greater number of latching teeth may also be present. In an exemplary embodiment, four latching teeth are evenly distributed along a circular portion of approximately 90°. These latching teeth may also be evenly distributed along a circular portion of approximately 180° or even greater than 180°.

[0044] In another exemplary embodiment, latch recesses are formed on the control element and evenly distributed along the contact portion, forming a circular pattern extending along the entire circle. In some embodiments, the pitch (or angular offset) of the circular pattern of the latch recesses is adapted to the pitch (or angular offset) of the latch teeth.

[0045] In another exemplary embodiment, the number of latch teeth is less than the number of latch recesses, wherein the movable comb includes latch ribs extending parallel to the adjustment direction of the movable comb, and wherein the latch ribs are configured to engage the latch recesses of the control element, the latch recesses being arranged in an area outside the circular pattern of the latch teeth (of the comb frame).

[0046] When the support portion of the comb frame can support the control element only along a circular segment (i.e., the support for the control element at the comb frame may be less than 360° or even only approximately 180°), the movable comb itself can assist in supporting the control element. Because the movable comb can move along a linear guide, the latch rib has an extension greater than the width of the latch recess, thus engagement of the latch rib and latch recess is possible regardless of the current position of the movable comb. The latch rib accommodates adjustable movement of the movable comb. In some embodiments, the latch rib is formed on the base plate of the movable comb frame adjacent to the slot and pin mechanism. The pin may be formed adjacent to the rear end of the latch rib.

[0047] In one exemplary embodiment, the pitch of the latch teeth is an integer multiple of the pitch of the latch recess. In this way, precise adjustment and small increments in the cutting length can be achieved.

[0048] In another exemplary embodiment, the adjustable-pitch comb includes at most a comb frame, movable comb parts, and movable control elements. No additional components are required to provide the main functions of the adjustable-pitch comb, including length setting, self-visualization of the mechanism, tactile / audio feedback, and mounting and securing the three components in their installed states. This reduces manufacturing and assembly costs. In some embodiments, additional metal components (e.g., compression springs, leaf springs, metal washers, spring rings, etc.) are not required to form the movable comb parts.

[0049] In another exemplary embodiment, at least one of the comb frame, movable comb member, and movable control element is formed as an integrally formed injection-molded part. In some embodiments, each of the comb frame, movable comb member, and movable control element is formed as an integrally formed injection-molded part. This may, of course, include printing and / or surface coating. In some embodiments, one or more of the comb frame, movable comb member, and movable control element are formed as metal-free parts. In some embodiments, at least one of the comb frame, movable comb member, and movable control element is made of a fiber-reinforced plastic injection-molded material. Fiber-reinforced plastics may include glass fibers, carbon fibers, aramid fibers, etc.

[0050] In another exemplary embodiment, the slot and pin mechanism includes a curved slot, particularly a helical slot, formed at the control element, and a pin formed at the movable comb and engaging with the curved slot. The curved slot may be formed on the bottom side of the control element. In some embodiments, the curved slot is formed at the control element between the (central) snap-fit ​​post and the (external) contact portion. That is, the rear (bottom) side of the inaccessible control element can be used to form the necessary features as an integrated feature of the control element.

[0051] In another exemplary embodiment, the comb frame provides a linear guide for the adjustable movement of a movable comb member. The movable comb member can move relative to the comb frame along the linear guide in the adjustable direction. This movement is caused by the operation of a control element attached to the movable comb member via a slot and pin mechanism. In some embodiments, the comb frame, the movable comb member, and the control element together form a cam-gear mechanism, particularly a flat cam-gear mechanism, wherein the comb frame forms a base for linear output movement of the movable comb member and a base for rotary input movement of the control element rotatably mounted on the comb frame.

[0052] In another aspect of this disclosure, a hair cutting instrument, particularly a hair trimmer or clipper, is provided, comprising a housing, a cutting unit including a set of blades, a motor configured to actuate the set of blades, and an adjustable-pitch comb according to at least one embodiment disclosed herein.

[0053] In some embodiments, the adjustable-pitch comb is an integral (permanent) component of the hair cutting instrument. In some embodiments, the adjustable-pitch comb is an additional component of the hair cutting instrument. In some embodiments, the adjustable-pitch comb is configured to be attached to the cutting head. In some embodiments, the adjustable-pitch comb can be detachably attached to the hair cutting instrument. In this way, the hair cutting instrument can be operated without the adjustable-pitch comb attached to it, but can also be operated with the adjustable-pitch comb attached to it. Attached Figure Description

[0054] These and other aspects of this disclosure will become apparent and illustrated with reference to the embodiments described below. In the following figures...

[0055] Figure 1 A perspective view of a hair-cutting tool is shown, featuring an adjustable-pitch comb. Figure 1 (Not shown in the image) can be attached to this hair-cutting tool;

[0056] Figure 2 It shows Figure 1 A partial magnified view of a hair-cutting device, with an adjustable-pitch comb attached to the device.

[0057] Figure 3 It shows Figure 2 A partial side view of the device to explain the comb adjustment used to set the cutting length;

[0058] Figure 4 It shows Figure 2 and Figure 3 An exploded perspective view of the layout;

[0059] Figure 5 It shows Figures 2-4 A partial cross-sectional perspective view of an adjustable-pitch comb;

[0060] Figure 6 A perspective bottom view of the control elements of an adjustable-pitch comb is shown;

[0061] Figure 7 A bottom view shows the control elements and movable comb parts of an adjustable-pitch comb;

[0062] Figure 8 It shows Figures 2-5A top view of an adjustable-pitch comb;

[0063] Figure 9 The comb with adjustable spacing is shown. Figure 8 A side view of the cross section of line IX-IX in the middle;

[0064] Figure 10 The comb with adjustable spacing is shown. Figure 9 Rear view of the cross section of line XX in the diagram;

[0065] Figure 11 The comb with adjustable spacing is shown. Figure 9 The front view of the section of line XI-XI; and

[0066] Figure 12 A perspective bottom view showing the arrangement of the comb frame of an adjustable-pitch comb. Detailed Implementation

[0067] Figure 1 A hair-cutting device 10, arranged as a hair trimmer, is shown. The hair-cutting device 10 has a housing 12 including a processing section 14. The housing 12 has an elongated shape, having a first end and a second end. The processing section 14 is where the user typically grips the device 10 during operation. A cutting head 16 is provided at the first end of the housing 12. The first end may also be referred to as the top end. The second end, opposite to the cutting head 16, may also be referred to as the bottom end. This should not be construed as limiting. A cutting unit 18 is provided at the cutting head 16. Figure 1 In one embodiment, the cutting unit 18 includes a blade assembly 20.

[0068] In some embodiments, the blade assembly 20 includes a fixed blade 22 and a movable blade 24, see also Figure 3 In operation, the instrument 10 can move in the direction of movement 26 through the hair to cut it. For this purpose, the fixed blade 22 and the movable blade 24 can operate in a scissor-like motion to cut the hair therebetween. The fixed blade 22 and the movable blade 24 together form at least one cutting edge at the front of the blade assembly 20. The front end points towards the direction of movement 26 (the direction of travel during operation). This defines the front side of the cutting unit 18. The opposite side, pointing in the opposite direction of movement 26, can be referred to as the rear side. Thus, for illustrative purposes, the top side, bottom side, front side, and rear side are defined.

[0069] At the blade assembly 20, there is a cutting movement 28 when the instrument 10 is in operation. The cutting movement 28 typically includes relative movement between the two blades 22, 24 of the blade assembly 20. In an exemplary embodiment, the movable blade 24 is operated to reciprocate relative to the fixed blade 22. In some embodiments, the fixed blade 22 faces the skin when the instrument 10 is in operation. Therefore, when the instrument 10 is operated to cut hair, the fixed blade 22 is positioned between the skin and the movable blade 24.

[0070] The housing 12 of the appliance 10 typically houses the electric motor 34 and the transmission unit 32. In an exemplary embodiment, the transmission unit 32 converts the rotational output movement of the motor 34 into reciprocating movement of the movable blade 24 relative to the fixed blade 22, see again. Figure 3 An on / off switch and / or other control elements may also be provided at the housing 12. For the power supply, the device 10 may be battery powered and / or arranged to be connected to the power grid.

[0071] use Figure 1 The arrangement of the fixtures shown makes it impossible to adjust the cutting length at fixture 10 and maintain the cutting length during operation. (Utilizing...) Figure 1 The arrangement of the instrument 10, when moved close to the skin to cut the hair there, will produce a fairly short cut length.

[0072] Reference Figures 2-11 An adjustable-pitch comb 40 is shown and further described. The adjustable-pitch comb 40 can be attached to... Figure 1 The instrument 10, particularly its cutting head 16, provides a defined gap between the blade assembly 20 and the skin. In this way, the hair cutting length can be defined, for example, 1.5 mm, 3.0 mm, 6.0 mm, 9.0 mm, etc. This should not be construed as restrictive.

[0073] In some embodiments, the adjustable-pitch comb 40 is a device that can be attached to the appliance 10 as needed. Therefore, in these embodiments, the adjustable-pitch comb 40 can also be removed / detached from the appliance when the shortest possible hair length is required. In some alternative embodiments, the adjustable-pitch comb 40 is a device that is permanently attached to the appliance 10. In some embodiments, the adjustable-pitch comb 40 can be mounted to the appliance 10 as a whole via a snap-fit ​​coupling or the like. This should not be construed as limiting.

[0074] like Figures 2-5As shown, the adjustable-pitch comb 40 consists of three basic components: a comb frame 42, a movable comb member 44, and a control element 46. In some embodiments, the adjustable-pitch comb 40 consists only of the comb frame 42, the movable comb member 44, and the control element 46. In some embodiments, the adjustable-pitch comb 40 includes at most the comb frame 42, the movable comb member 44, and the control element 46. This means that the basic features of the adjustable-pitch comb 40 are provided by the three components 42, 44, 46 and their functional cooperation.

[0075] In some embodiments, each of the comb frame 42, the movable comb 44, and the control element 46 is an injection-molded plastic component. In some embodiments, the adjustable-pitch comb 40 is a metal-free device.

[0076] The comb frame 42 serves as a base for the movable comb 44 and the control element 46. The comb frame 42 may also be a mounting part of the adjustable-pitch comb 40 that engages with the housing 12 and / or the cutting head 16 of the appliance 10.

[0077] In an exemplary embodiment, the control element 46 is rotatably mounted to the comb frame 42. The control element 46 can be operated by a user with reference to a curved double arrow 50. The control element 46 can rotate (pivot) about a control axis 52. A gripping surface 54 is provided at the circumferential portion of the control element 46, which is accessible to the user for setting the length of the adjustable-pitch comb 40. The portion of the control element 46 that is visible and accessible to the user may also be referred to as a control disc.

[0078] Figure 3 The adjustable movement of the movable comb 44 relative to the comb frame 42 along the adjustment direction (double arrow 56) is shown. Figure 3 In the middle, the dashed lines indicate the retracted and extended positions of the movable comb 44.

[0079] Furthermore, a toothed indexing profile 60 is formed between the control element 46 and the comb frame 42. The toothed indexing profile 60 enables the adjustable-pitch comb 40 to self-lock within a selected length setting of the movable comb 44.

[0080] The distance between the skin-facing side 62 of the movable comb 44 and the blade assembly 20 of the instrument 10 can be adjusted by an actuation control element, wherein the actuation refers to an input movement 50 of the control element 46 relative to the comb frame 42 about a control axis 52. In an exemplary embodiment, the control element 46 and the movable comb 44 are mechanically coupled to form a linkage such that actuation of the control element 46 (arrow 50) causes the movable comb 44 to move relative to the comb frame 42 (arrow 56).

[0081] Figure 4The exploded view of the adjustable-pitch comb 40 is shown in a perspective top view. For illustrative purposes, Figure 5 It is a partially cut perspective view of the adjustable-pitch comb 40, with half of the control element 46 in cross section.

[0082] The comb frame 42 and the control element 46 together form a snap-fit ​​connection 66 including a snap-fit ​​post 68 and a corresponding snap-fit ​​recess 70. In some embodiments, the snap-fit ​​post 68 is formed on the bottom side of the control element 46, facing the comb frame 42 and / or the housing 12 of the appliance 10. In some embodiments, the snap-fit ​​recess 70 is formed in the comb frame 42 to be engaged by the snap-fit ​​post 68. Further embodiments are possible, wherein the snap-fit ​​post 68 is formed on the comb frame 42 and the snap-fit ​​recess 70 is formed in the control element 46.

[0083] The snap-fit ​​connection 66 secures the control element 46 to the comb frame 42, while also providing therein the degree of freedom for operation (rotational input movement 50 about the control axis 52).

[0084] In an exemplary embodiment, a slot and pin mechanism 76 is formed between the movable comb 44 and the control element 46 to convert the input movement 50 of the control element 46 into an adjusting movement of the movable comb 44. A curved groove 78, particularly a spiral groove 82, is formed on the bottom side of the control element 46; see also... Figure 6 , Figure 6 This is a perspective bottom view of control element 46.

[0085] At the movable comb 44, a pin 80 is formed that engages with the bending groove 78. In an exemplary embodiment, the bending groove 78 is a helical groove 82 extending about the control axis 52 (see...). Figure 6 In an exemplary embodiment, the curved groove 78 does not rotate fully about the control axis 52. Therefore, the range of movement of the rotational input movement 50 of the control element 46 is less than 360°. However, this should not be construed as limiting. As the control element 46 rotates, the distance between the pin 80 and the control axis 52 changes due to the form of the curved groove 78. Therefore, as the control element 46 rotates, the movable comb 44 can move relative to the comb frame 42 to be drawn out and retracted (see arrow 56 for adjustment direction).

[0086] exist Figure 5In the accompanying drawing, reference numeral 84 indicates preloading of the control element 46 toward the comb frame 42. Preloading 84 is caused by a snap-fit ​​connection 66 between the two components. In this way, the control element 46 can be used as a resilient element capable of storing energy due to its inherent bias. In other words, in some embodiments, the control element 46 functions as a spring element / spring washer. This can be achieved without requiring additional components such as metal spring elements. As an example, the snap-fit ​​connection 66 can only be achieved by pressing against the top side of the control element 46 (see Figure 1). Figure 5 The arrow 84 in the diagram is used to establish this. Therefore, a certain pretension can be induced in the control element 46, which stores mechanical energy and causes spring-like behavior.

[0087] To guide adjustment movement in the adjustment direction 56, a linear guide 90 is formed between the comb frame 42 and the movable comb member 44. The guiding direction of the linear guide 90 is parallel to the adjustment direction 56. In an exemplary embodiment, the linear guide 90 includes opposing guide recesses 92 at the comb frame 42 and two matching opposing guide ribs 94 at the movable comb member 44 (see Figure 4 and Figure 11 Alternatively, guide recesses can be formed on the comb piece 44, and corresponding guide ribs can be formed on the comb frame 42.

[0088] Considering the linear guide 90 between the comb frame 42 and the movable comb piece 44, the snap-fit ​​connection 66 providing the control element 46 with rotational freedom relative to the comb frame 42, and the slot and pin mechanism 76 formed between the control element 46 and the movable comb piece 44, these three components 42, 44, and 46 can together form a cam-gear mechanism that transmits rotational input into linear output movement. The transmission ratio of this cam-gear mechanism allows for fine adjustment of the cutting length under moderate operating force.

[0089] A support portion 98 is formed on the raised shoulder 100 of the comb frame 42. Overall, the comb frame 42 forms a U-shaped bracket 102 in a top view.

[0090] The control element 46 can be arranged as a control disc or control wheel 106. A contact portion 110 is formed in the peripheral region 108 of the control element 46, which contacts a support portion 98 when the control element 46 is mounted on the comb frame 42. A latching tooth 114 is formed at the support portion 98. See also... Figures 4-6 A latch recess 116 is formed at the contact portion 110. When the control element 46 is in a corresponding relative orientation with respect to the comb frame 42, the latch teeth 114 can engage the latch recess 116. Due to a certain preload 84 at the control element 46, the support portion 98 and the contact portion 110 can be pushed against each other to achieve stable rotational positioning of the control element 46.

[0091] Thus, when the latch teeth 114 align with the corresponding number of latch recesses 116, the preload 84 causes the latch teeth 114 and latch recesses 116 to engage. In this way, the adjustable-pitch comb 40 provides self-locking at a given length setting. In some embodiments, the self-locking of the adjustable-pitch comb 40 means that the cam gear mechanism cannot be operated by externally induced movement of the movable comb 44. Therefore, during hair cutting operations, the cutting length setting can be reliably maintained even when the instrument 10 with the adjustable-pitch comb 40 mounted thereon (moderately) presses against the skin.

[0092] The movable comb 44 includes a base plate 118 and inclined comb arms 120 extending therefrom. At the base plate 118, a slot and pin 80 for a pin mechanism 76 can be formed. Adjacent to the pin 80, a latch rib 122 is formed, the latch rib 122 being arranged to engage with a latch recess 116 of the control element 46. Figure 4 and Figure 5 As shown, the latch rib 122 has a length to accommodate the length adjustment movement of the movable comb 44 in the adjustment direction 56, and is also capable of engaging in the latch recess 116 when the movable comb 44 is in the fully extended position. The latch rib 122 extends substantially parallel to the adjustment direction 56 and parallel to the linear guide 90.

[0093] A length indicator 124 can be provided on the top side of the control element 46, see [reference]. Figure 4 Similarly, a length reference 126 can be formed at the comb frame 42 to provide visual information about the actual length setting when a length indicator 124 is aligned with the length reference 126.

[0094] The support portion 98 with latch teeth 114 and the contact portion 110 with latch recesses 116 together form a toothed indexing profile 60. Latch ribs 122 may also form part of the toothed indexing profile 60. Due to the preload 84 between the control element 46 and the comb frame 42, tactile and / or auditory feedback can be provided when the control element 46 rotates and the latch teeth 114 (and latch ribs 122, if present) and the opposing latch recesses 116 disengage and re-engage. Figure 5 and Figure 6 As shown, in at least some embodiments, the control element 46 has a flexible disc portion 128 that can flex due to a preload 84 between the control element 46 and the comb frame 42. In other words, the flexible disc portion 128 can act as a spring washer when the control element 46 and the comb frame 42 are pushed against each other.

[0095] Figure 6It is shown that the number of latch recesses 116 can be greater than the number of latch teeth 114 (see...). Figure 4 In some embodiments, the pitch of the latch teeth 114 at the support portion 98 may be greater than (e.g., multiple integers) the pitch of the latch recesses 116 at the contact portion 110 of the control element 46. In the assembled state, the control element 46 rests against the comb frame 42 only with a circular segment of the contact portion 110 (e.g., about 180° or even less than 180°). For further support, the contact portion 110 may also rest against the base plate 118 of the movable comb 44 in areas not supported by the support portion 98 of the comb frame 42. Similarly, not only the latch teeth 114 of the support portion 98, but also the latch ribs 122 at the base plate 118 may engage the latch recesses 116 to provide proper placement along the entire circumference of the control element 46. Needless to say, in other embodiments, the pitch of the latch recesses 116 and the pitch of the latch teeth 114 may be the same.

[0096] Figure 6 The rear perspective view of the control element 46 shown also shows that the snap-fit ​​post 68 provides a support surface 130. One or more snap hooks 132 are formed at the end of the snap-fit ​​post 68 opposite to the top side. One or more protruding edges 134 are provided that engage the corresponding contours of the snap-fit ​​recess 70. The snap-fit ​​post 68 also includes a necking 136 with reduced external dimensions. When the snap-fit ​​recess 70 engages with the snap-fit ​​post 68, the necking 136 facilitates the deformation of the one or more snap hooks 132.

[0097] Figure 7 (Bottom view) and Figure 8 (Top view) shows the rear end portion of the tilting comb arm 120 extending beyond the control element 46, see also Figure 9 The side view. Therefore, the control element 46 can extend into the gap 146 between the inclined comb arm 120 and the substrate 118 of the movable comb 44 (see side view). Figure 9 The gap 146 provides mounting space for the control element 46. Therefore, the external dimensions (diameter) of the control element 46 can be increased. Overall, the adjustable-pitch comb 40 can have a smaller volume design while still providing a favorable transmission ratio between the input movement 50 at the control element 46 and the resulting adjustable movement of the movable comb 44. Figure 9 In the cross-sectional side view, the inclined comb arm 120 is formed as a protruding top that partially extends beyond the control element 46. On the front side, the inclined comb arm 120 is coupled to the substrate 118. Figure 9 In the side view, the inclined comb arm 120 and the substrate 118 are inclined relative to each other towards the rear side, forming a V-shape with an opening towards the rear side.

[0098] Figure 7The design of the curved groove 78 on the bottom side of the control element 46 facing the comb frame 42 is also shown. Figure 7 In the arrangement shown, pin 80 engages the curved groove 78 very close to the control axis 52. Therefore, the movable comb 44 is in the fully retracted position. If the control element 46 is in Figure 7 If the arrangement is rotated clockwise, the movable comb 44 will be gradually pulled out.

[0099] Figure 8 It also indicated Figure 9 The location of the cross section in the side view is shown in line IX-IX. Figure 9 It also indicated Figure 10 Rear view (see line XX) and Figure 11 The cross-sectional position in the front view (see line XI-XI).

[0100] Figure 9 and Figure 10 The engagement state of the snap-fit ​​post 68 and the snap-fit ​​recess 70, which together form the snap-fit ​​connection 66, is shown. Figure 6 As shown, the snap-fit ​​post 68 has a support surface 130. The snap-fit ​​recess 70 serves as a corresponding support. Therefore, the snap-fit ​​post 68 and the snap-fit ​​recess 70 together form a pivot support 138 for controlling the rotational movement of the control element 46 relative to the comb frame 42 (see also...). Figure 10 Furthermore, the snap-fit ​​recess 70 provides a snap-fit ​​area 140 that can engage with at least one protruding edge 134 of at least one snap-fit ​​hook 132. In an exemplary embodiment, the snap-fit ​​area 140 is formed on the underside of the inner collar 142 within the snap-fit ​​recess. As discussed further above, the snap-fit ​​connection 66 between the comb frame 42 and the control element 46 can be designed such that a certain preload 84 must be applied to the control wheel 46 to insert the snap-fit ​​post 68 sufficiently deep into the snap-fit ​​recess 70 so that the protruding edge 134 can ultimately engage the snap-fit ​​area 140. In other words, the snap-fit ​​connection 66 may be referred to as an axial interference snap-fit ​​connection 66.

[0101] In this way, a certain amount of energy can be stored in the control element 46, which acts in a spring-like manner. This has the effect that, in the peripheral region 108 of the control element 46, the support portion 98 and the contact portion 110 can press against each other at least slightly to provide a self-locking feature. In other words, the control disc or control wheel 106 can be at least slightly flexible and elastic so as to be able to deform during operation of the control wheel 46. This can also produce a clicking feedback as the latch recess 116 and the latch teeth 114 engage and disengage during rotation.

[0102] Figure 11The cross-sectional design of the linear guide 90 is shown, wherein the guide recess 92 is formed at the comb frame 42 and the guide rib 94 is formed at the movable comb 44.

[0103] Figure 12 Another method for generating preload between control element 46 and comb frame 42 is shown. Figure 12 The comb frame 42, shown in a perspective bottom view, has a raised shoulder 100 in which a support portion 98 for the control element 46 is formed; see also [reference needed]. Figures 4-6 As part of the linear guide 90 of the adjustable-pitch comb 40, guide ribs 94 are formed on the comb frame 42. The guide ribs 94 can cooperate with corresponding guide recesses 92 at the correspondingly designed movable comb 44. It should be noted that the guide recesses 92 and guide ribs 94 of the linear guide 90 can be formed on either the comb frame 42 or the movable comb 44, see also [reference needed]. Figure 4 , Figure 5 and Figure 11 .therefore, Figure 12 The arrangement should not be interpreted as restrictive in this respect.

[0104] exist Figure 12 In one embodiment, the comb frame 42 provides a snap-fit ​​recess 70 in a snap-fit ​​socket 150 formed on the flexible tab 152 and extending along the control axis 52. The flexible tab 152 is connected to the raised shoulder 100 of the comb frame 42 via a connector 154 having a relatively small cross-section. That is, the flexible tab 152 is formed as a tongue-like portion, and therefore, when the control element 46 and the comb frame 42 are pushed together, the flexible tab 152 is responsive to the formation of a snap-fit ​​connection 66 (see [link to relevant documentation]). Figure 10 The force applied to it causes it to bend.

[0105] In some embodiments, when the snap-fit ​​connection 66 is formed, both the control element 46 and the comb frame 42 may exhibit some degree of flexure. In some embodiments, the control element 46 primarily exhibits some degree of flexure, for example at the flexure disc portion 128 (see...). Figure 5 and Figure 6 In some embodiments, the comb frame 42 exhibits a certain degree of flexure, for example, at the flexible tab 152 (see...). Figure 12 While the present invention has been described and illustrated in detail with reference to the accompanying drawings and the foregoing description, such description and illustration should be considered illustrative or exemplary rather than restrictive; the present invention is not limited to the disclosed embodiments. Other variations of the disclosed embodiments will be understood and implemented by those skilled in the art in practicing the claimed invention through study of the drawings, the disclosure, and the appended claims.

[0106] In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite articles "a" or "an" do not exclude multiple. A single element or other unit can perform the functions of several items described in the claims. The fact that certain measures are recited in mutually different dependent claims does not mean that combinations of these measures cannot be used advantageously.

[0107] Any reference numerals in the claims should not be construed as limiting the scope.

Claims

1. An adjustable spacing comb (40) for a hair cutting appliance (10), characterized in that, include: Comb frame (42). A movable comb (44) is arranged to move relative to the comb frame (42) in an adjustment direction (56), and A movable control element (46) is mounted on the comb frame (42). The comb frame (42) and the control element (46) together form a slot and pin mechanism (76), which converts the input movement (50) of the control element (46) into an adjustable movement of the movable comb (44) relative to the comb frame (42) in the adjustment direction (56). The comb frame (42) and the control element (46) together form a snap-fit ​​connection (66). The control element (46) has a contact portion (110) that rests on a support portion (98) of the comb frame (42); The contact portion (110) and the support portion (98) form a toothed indexing profile (60), the toothed indexing profile including a latch recess (116) and opposing latch teeth (114), and The control element (46) and the comb frame (42) together push the contact portion (110) and the support portion (98) against each other so that the latch teeth (114) engage with the latch recess (116).

2. The adjustable-pitch comb (40) according to claim 1, characterized in that, The snap-fit ​​connection (66) between the control element (46) and the comb frame (42) includes a protruding snap-fit ​​post (68) and a corresponding snap-fit ​​recess (70), and The protruding snap-fit ​​post (68) is configured to engage in the snap-fit ​​recess (70) to secure the control element (46) to the comb frame (42).

3. The adjustable-pitch comb (40) according to claim 2, characterized in that, The protruding snap-fit ​​post (68) and the snap-fit ​​recess (70) together form a pivot support (138) for the movement of the control element (46).

4. The adjustable-pitch comb (40) according to claim 2, characterized in that, The snap-fit ​​post (68) includes at least one protruding edge (134) configured to engage the snap-fit ​​area (140) of the snap-fit ​​recess (70).

5. The adjustable-pitch comb (40) according to claim 3, characterized in that, The snap-fit ​​post (68) includes at least one protruding edge (134) configured to engage the snap-fit ​​area (140) of the snap-fit ​​recess (70).

6. The adjustable-pitch comb (40) according to any one of claims 2-5, characterized in that, The snap-fit ​​engagement between the protruding snap-fit ​​post (68) and the corresponding snap-fit ​​recess (70) includes preloading the control element (46) and the comb frame (42) to push the contact portion (110) against the support portion (98).

7. The adjustable-pitch comb (40) according to claim 6, characterized in that, The snap-fit ​​engagement between the protruding snap-fit ​​post (68) and the corresponding snap-fit ​​recess (70) includes flexing the flexure disc portion (128) of the control element (46) and / or flexing the flexible tab (152) of the comb frame (42).

8. The adjustable-pitch comb (40) according to any one of claims 1-5 and 7, characterized in that, The latch recess (116) and latch teeth (114) of the toothed indexing profile (60) are axial locking features between the comb frame (42) and the control element (46).

9. The adjustable-pitch comb (40) according to claim 6, characterized in that, The latch recess (116) and latch teeth (114) of the toothed indexing profile (60) are axial locking features between the comb frame (42) and the control element (46).

10. The adjustable-pitch comb (40) according to any one of claims 1-5, 7 and 9, characterized in that, When the contact portion (110) and the support portion (98) move relative to each other, the control element (46) is actuated to generate at least one of tactile feedback and / or acoustic feedback.

11. The adjustable pitch comb (40) of claim 10, wherein, The actuation of the control element (46) to generate at least one of tactile feedback and / or acoustic feedback includes the partial lifting and lowering of the control element (46) when the latch recess (116) and the latch teeth (114) disengage and engage in a new relative orientation between the movable comb (44) and the comb frame (42).

12. The adjustable-pitch comb (40) according to any one of claims 1-5, 7 and 9, characterized in that, The control element (46) is a control wheel (106) that is rotatable relative to the comb frame (42) about a control axis (52). The contact portion (110) is radially offset from the control axis (52), and / or The control element (46) has a knurled external gripping surface (54) for actuation.

13. The adjustable-pitch comb (40) according to any one of claims 1-5, 7 and 9, characterized in that, The contact portion (110) is formed in the peripheral region (108) of the control element (46) facing the comb frame (42), and / or The support portion (98) is formed on the raised shoulder (100) of the comb frame (42).

14. The adjustable-pitch comb (40) according to any one of claims 1-5, 7 and 9, characterized in that, The latching teeth (114) are formed on the comb frame (42) and evenly distributed along the support portion (98), thereby forming a circular pattern extending along the circular section, and / or The latch recess (116) is formed on the control element (46) and is evenly distributed along the contact portion (110), thereby forming a circular pattern extending along the whole circle.

15. The adjustable-pitch comb (40) according to claim 14, characterized in that, The number of latch teeth (114) is less than the number of latch recesses (116). The movable comb (44) includes a latch rib (122) extending parallel to the adjustment direction (56) of the movable comb (44), and The latch rib (122) is configured to engage the latch recess (116) of the control element (46), the latch recess being located in the area outside the circular pattern of the latch teeth (114).

16. The adjustable-pitch comb (40) according to any one of claims 1-5, 7, 9 and 15, characterized in that, The adjustable-pitch comb (40) comprises at most the comb frame (42), the movable comb piece (44), and the movable control element (46), and / or At least one of the comb frame (42), the movable comb (44), and the movable control element (46) is formed as an integral injection molded part.

17. The adjustable-pitch comb (40) according to any one of claims 1-5, 7, 9 and 15, characterized in that, The slot and pin mechanism (76) includes a curved slot (78) formed at the control element (46), and a pin (80) formed at the movable comb (44) and engaging the curved slot (78), and / or The comb frame (42) provides a linear guide (90) for the adjustable movement of the movable comb (44).

18. The adjustable-pitch comb (40) according to any one of claims 1-5, 7, 9 and 15, characterized in that, The groove and pin mechanism (76) includes a spiral groove (82) formed at the control element (46), and a pin (80) formed at the movable comb (44) and engaging the spiral groove (82), and / or The comb frame (42) provides a linear guide (90) for the adjustable movement of the movable comb (44).

19. A hair cutting appliance (10) characterized in that, The device includes a housing (12), a cutting unit (18) including a blade assembly (20), a motor (34) configured to actuate the blade assembly (20), and an adjustable-pitch comb (40) according to any one of claims 1-18.

20. A hair cutting appliance (10) according to claim 19, characterized in that The hair cutting device (10) is a hair trimmer or clipper.

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