Adjustable blade assembly with magnetic tension

Abstract

To provide an adjustable blade assembly having magnetic tensioning that reduces friction between the blades, which reduces load on a motor and improves overall efficiency of a system.SOLUTION: A hair clipper or cutter is provided with an adjustment slider that adjusts the gap between an inner and outer blade. A yoke is attached to the inner blade. The adjustment slider may be configured with preset gap lengths and may be adjustable before, after, or during a hair cutting operation. A T-guide couples the adjustment slider to the inner blade to slidably move the inner blade relative to the outer blade. The yoke, inner blade, outer blade and / or T-guide may be magnetized to create an attractive or repulsive force between the inner blade and the outer blade. In some embodiments, the yoke is not metallic. The magnetized yoke may be a non-conductive magnet carrier (e.g., plastic) or conductive material (e.g., ferromagnetic).SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED PATENT APPLICATIONS)

[0001] This application claims the benefit of and priority to Ser. No. 62 / 830,829, filed April 8, 2019, and Ser. No. 62 / 719,281, filed August 17, 2018, which are incorporated herein by reference in their entireties.

[0002] FIELD OF THE INVENTION The present invention relates generally to the field of hair clippers and hair cutting devices. [Background technology]

[0002] The present invention particularly relates to an adjustable tension assembly configured to adjust the blade gap between the reciprocating blade and the stationary blade of a blade assembly. The present invention also relates to a magnetic tension assembly configured to provide tension between the reciprocating blade and the stationary blade of a blade assembly. Summary of the Invention [Means for solving the problem]

[0003] One embodiment of the present invention relates to a magnetic blade assembly. The magnetic blade assembly includes a first blade, a second blade, and a blade guide assembly. The first blade has a first blade edge having a plurality of teeth. The second blade has a second blade edge having a plurality of teeth. The second blade edge is parallel to the first blade edge, and the blades oscillate relative to each other. The blade guide assembly is captured between the first and second blades and maintains the relative position of the first blade edge with respect to the second blade edge. The blade guide includes a guide member and a magnetic assembly. The guide member has a base and a cross-portion, and the cross-portion is captured between the first and second blades and has a first side adjacent to the first blade and a second side adjacent to the second blade. The magnetic assembly includes a plurality of magnets extending along the cross-portion of the guide member between the first and second blades to generate an attractive force between the blade guide assembly and the first blade.

[0004] Another embodiment of the present invention relates to a magnetic blade assembly. The magnetic blade assembly includes an outer cutter, an inner cutter, and a blade guide assembly. The outer cutter has an outer cutting edge with multiple teeth. The inner cutter has an inner cutting edge with multiple teeth. The inner cutting edge is parallel to the outer cutting edge, and the inner cutter oscillates over the outer cutter. The blade guide assembly is captured between the inner and outer cutters and maintains the relative position of the inner cutting edge with respect to the outer cutting edge as the inner cutter oscillates over the outer cutter. The blade guide assembly includes a T-shaped guide member and a magnetic assembly. The T-shaped guide assembly has a base and a cross portion. The cross portion is captured between the inner and outer cutters and has an inner section adjacent to the inner cutter and an outer section adjacent to the outer cutter. The magnetic assembly includes multiple magnets disposed in the inner section of the cross portion between the guide member and the inner cutter to generate a magnetic attractive force between the blade guide assembly and the inner cutter.

[0005] Another embodiment of the present invention relates to a blade assembly including an inner cutter, an outer cutter, and a blade guide assembly. The inner cutter has an inner cutting edge with a plurality of teeth. The outer cutter has an outer cutting edge with a plurality of teeth parallel to the inner cutting edge. The inner cutter oscillates over the outer cutter. The blade guide assembly is captured between the inner and outer cutters. The blade guide assembly has a guide member, an adjustable gap assembly, and a diagonal slot mechanism. The guide member has a base and a cross portion captured between the inner and outer cutters. The adjustable gap assembly is within the guide member and extends along the cross portion of the guide member between the inner and outer cutters. The adjustable gap assembly generates a force between the blade guide assembly and the inner cutter to maintain the relative position of the inner cutting edge with respect to the outer cutting edge. The diagonal slot mechanism is coupled to the base of the guide member and the adjustable gap assembly. Movement of the diagonal slot mechanism in a direction parallel to the inner and outer cutting edges moves the cross portion of the guide member perpendicular to the inner and outer cutting edges, and thus the gap between the inner and outer cutting edges increases or decreases based on the movement of the diagonal slot mechanism in a direction parallel to the inner and outer cutting edges.

[0006]

[0006] Alternative exemplary embodiments relate to other features and combinations of features as may be broadly set forth in the claims.

[0007]

[0007] This application will become more fully understood from the following detailed description taken in conjunction with the accompanying drawings, in which like reference numerals refer to like elements and in which: [Brief explanation of the drawings]

[0008] [Figure 1]

[0008] FIG. 1 is a perspective view of a hair cutting device according to an exemplary embodiment. [Figure 2]

[0009] FIG. 1 is a top perspective view of an assembled blade assembly according to an exemplary embodiment. [Figure 3]

[0010] FIG. 3 is an exploded view of the blade assembly of FIG. 2. [Figure 4]

[0011] 4 is a bottom perspective view of the spring retainer of FIG. 2 in an opposite position to the top view shown in FIG. 3. [Figure 5]

[0012] 1 is a diagram of a blade assembly with some components removed to show a switch, a T-blade, and inner and outer blades according to an exemplary embodiment. FIG. [Figure 6]

[0013] FIG. 6 is a top view of the blade assembly of FIG. 5 with the ridges of the spring retainer shown in cross section, according to an exemplary embodiment. [Figure 7]

[0014] 6 is a top view of the blade assembly of FIG. 5 in a first aligned position with the inner and outer cutters aligned, according to an exemplary embodiment. [Figure 8]

[0015] 6 is a top view of the blade assembly of FIG. 5 in an intermediate position where the inner cutter is partially extended and partially retracted along the outer cutter, according to an exemplary embodiment. [Figure 9]

[0016] 6 is a top view of the blade assembly of FIG. 5 in a retracted position where the inner cutter is fully retracted relative to the outer cutter, according to an exemplary embodiment. [Figure 10]

[0017] FIG. 1 is a plan view of one embodiment of a blade assembly with magnetic tension. [Figure 11]

[0018] FIG. 11 is a first side view of the blade assembly of FIG. 10. [Figure 12]

[0019] 12 is a second side view of the blade assembly of FIG. 10, in an opposite position from the side shown in FIG. 11. [Figure 13]

[0020] FIG. 11 is a perspective view of the rear and first side of the blade assembly of FIG. 10. [Figure 14]

[0021] FIG. 1 is a plan view of one embodiment of a blade assembly with magnetic tension. [Figure 15]

[0022] FIG. 15 is a first side view of the blade assembly of FIG. 14 illustrating a portion of the magnetic tension assembly. [Figure 16]

[0023] 16 is a second side view of the blade assembly of FIG. 14, in an opposite position from the side shown in FIG. 15. [Figure 17]

[0024] FIG. 15 is a front view of the blade assembly of FIG. 14. [Figure 18]

[0025] FIG. 10 is a first side view of another embodiment of a blade assembly having magnetic tension implemented in an embodiment of a hair-cutting device. [Figure 19]

[0026] 19 is a second side view of the blade assembly of FIG. 18, in an opposite position from the side shown in FIG. 18. [Figure 20]

[0027] FIG. 19 is a first side view of the blade assembly of FIG. 18, further illustrating the magnetic tension assembly. [Figure 21]

[0028] 21 is a second side view of the blade assembly of FIG. 18 in an opposite position to the side shown in FIG. 20, further illustrating the magnetic tension assembly. [Figure 22]

[0029] FIG. 10 is a first side view of another embodiment of a blade assembly having magnetic tension implemented in an embodiment of a hair-cutting device. [Figure 23]

[0030] 23 is a second side view of the blade assembly of FIG. 22, in an opposite position from the side shown in FIG. 22. [Figure 24]

[0031] FIG. 10 is a plan view of another embodiment of a blade assembly with magnetic tension. [Figure 25]

[0032] FIG. 25 is a first side view of the blade assembly of FIG. 24. [Figure 26]

[0033] 26 is a second side view of the blade assembly of FIG. 24, in an opposite position from the side shown in FIG. 25. [Figure 27]

[0034] FIG. 10 is a plan view of another embodiment of a blade assembly having magnetic tension, and more specifically, electromagnetic tension. [Figure 28]

[0035] FIG. 28 is a first side view of the blade assembly of FIG. 27. [Figure 29]

[0036] FIG. 28 is a first front side view of the blade assembly of FIG. 27. [Figure 30]

[0037] FIG. 28 is an exploded view of the blade assembly of FIG. 27. [Figure 31]

[0038] FIG. 10 is a plan view of a seventh embodiment of a blade assembly having an alternative embodiment of magnetic tension, more specifically, electromagnetic tension. [Figure 32]

[0039] FIG. 32 is a perspective view of the outer blade of the blade assembly of FIG. 31 coupled to an electromagnet. DETAILED DESCRIPTION OF THE INVENTION

[0009]

[0040] With general reference to the figures, various embodiments of hair clippers and hair clippers are shown. The cutters include a blade assembly with an upper or inner blade that oscillates over a lower or outer blade to cut or trim hair. The alignment or gap of the edge of the inner blade relative to the edge of the outer blade affects the cut hair length. For example, if the outer blade has a surface that decreases along its length, moving the inner blade relative to the outer blade will change the length of the hair cut. An adjustment slide or selector mechanism is coupled to the inner blade and moves the cutting edge of the inner blade relative to the outer blade to adjust the gap created between the cutting edges of the inner and outer blade teeth. This movement extends or retracts the blade, which increases or decreases the gap between the cutting edges of the inner and outer blades. Controlling the size of the gap allows the operator to adjust the desired cut length at which the hair clippers will cut hair.

[0010]

[0041] Proper tension between the blades reduces friction in the system, blade wear and tear, and increases the operating life of the motor. The inner and outer blades should be tensioned / pulled together so that the vibration of the inner and outer teeth does not interfere with the cutting edges of the blades. A guide member, such as a T-guide formed by including an arm on the inner blade, allows the inner and outer blades to oscillate while maintaining the desired tension (e.g., using a spring or other biasing mechanism).

[0011]

[0042] Applicant has discovered that using magnetic forces to generate tension between the inner and outer blades reduces friction between the blades, which reduces the load on the motor and improves overall system efficiency. For example, a guide member located between the upper and lower blades (e.g., the inner and outer blades) is magnetized, includes a magnet, or includes an electromagnetic system that creates an attractive force between the blades to reduce friction of the inner blade's vibration. In some embodiments, the system detects the load or speed of the motor or blades and increases or decreases the electromagnetic attractive force to minimize the load.

[0012]

[0043] Combining a T-guide with a guide rail or cross section and arm or body having a diagonal slot mechanism allows the operator to select the gap between the cutting edges of the inner and outer blades to cut hair at a desired length. This configuration allows the operator to selectively adjust the blade set before, during, or after operation. The operator can select the relative closeness of the cut without removing the blade set and manually realigning the blades. Preset detents in the diagonal slots or along the adjustment slide create a predetermined gap related to the desired cut length. The adjustment slide moves between the detents to a selected, fixed haircut length (e.g., a predetermined cut length).

[0013]

[0044] For ease of discussion and understanding, the detailed description that follows will be illustrated with reference to a blade assembly incorporating magnetic tension and / or blade set adjustment in connection with a hair-cutting apparatus or "cutter." It should be understood that "cutter" is provided for illustrative purposes and that the blade assemblies disclosed herein can be used in connection with any hair-cutting, hair-trimming, or hair-grooming device. Thus, the term "cutter" is inclusive and refers to any hair-grooming device, including, but not limited to, a hair trimmer, clippers, or any other hair-cutting or hair-grooming device. The cutter device can be suitable for humans, animals, or any other animate or inanimate object having hair.

[0014]

[0045] FIG. 1 illustrates an example embodiment of a hair-cutting device, trimmer, clippers, or cutter 100. The cutter 100 includes a body 102, a blade set or assembly 104, and a drive assembly 106. As illustrated in FIG. 1 , the body 102 is handheld and includes two parts in a clamshell configuration: a first or upper housing 108 and a second or lower housing 110 (e.g., at the top and bottom of the cutter 100). The body 102 of the cutter 100 can include other configurations. For example, the upper housing 108 and / or the lower housing 110 form a single, integrated body 102 or component parts. The body 102 can join the housings 108 and / or 110 (e.g., from one or more sides) in other clamshell configurations and can include additional parts on the top, bottom, sides, or ends of the body 102. The blade assembly 104 includes a translating upper or inner blade 112 and a stationary lower or outer blade 114. The body 102 and the housings 108 and / or 110 define a cutting edge 116 that includes the blade assembly 104. The body 102 further defines a cavity 118 for supporting a motor 120. As illustrated in FIG. 1 , the cavity 118 is formed from the upper and lower housings 108, 110 in a clamshell configuration such that the body 102 encloses the drive assembly 106 and motor 120 that are coupled to the blade assembly 104.

[0015]

[0046] The drive assembly 106 is positioned within the cavity 118 and couples the blade assembly 104 to a motor 120. As shown, the motor 120 is a rotary DC electric motor 120. In other embodiments, the motor 120 is a rotary or magnetic motor 120 that generates oscillating or reciprocating motion for the blade assembly 104. In other embodiments, the motor 120 is an AC electric motor or any other suitable motor for generating oscillating or reciprocating motion for the blade assembly 104, e.g., for the inner blade 112 and / or the outer blade 114. As shown, the motor 120 is configured to operate on battery power (e.g., cordless), but can be configured to operate on any suitable power source, e.g., electricity from a corded cutter 100 plugged into an electrical outlet.

[0016]

[0047] The motor 120 is coupled to a rotary motor output shaft 122 that rotates about a rotational axis. The eccentric drive 124 is coupled to the motor output shaft 122 and rotates eccentrically about the rotational axis. The eccentric drive 124 includes an eccentric shaft 126 that is offset from the motor output shaft 122. In other words, the eccentric shaft 126 is offset from the rotational axis of the motor 120 such that the eccentric shaft 126 rotates non-concentrically about the rotational axis to create an oscillatory rotational behavior. The eccentric shaft 126 is configured to engage a yoke 128 ( FIG. 2 ) of the blade assembly 104 to linearly translate or oscillate the inner blade 112. The blade assembly 104 is coupled to the cutting end 116 of the body 102. For example, the blade assembly 104 can be coupled to the body 102 using adhesives, rivets, welding, bolts, screws, or at least one fastener.

[0017]

[0048] 2 illustrates a perspective view of the blade assembly 104. The blade assembly 104 includes an inner cutter 112 and an outer cutter 114. In the illustrated embodiment, the outer cutter 114 does not oscillate, and is fixed relative to the body 102 such that the inner cutter 112 is configured to oscillate, reciprocate, or slide relative to the outer cutter 114 to facilitate cutting. The inner cutter 112 oscillates over the outer cutter 114 to create a cutting blade assembly 104 that is capable of cutting hair.

[0018]

[0049] The blade assembly 104 includes an adjustable gap assembly, mechanism, or slide 130 that translates the inner cutter 112 over the outer cutter 114 in a direction transverse to the oscillatory behavior of the inner cutter 112. This translation of the inner cutter 112 in the transverse direction varies the cutting length during operation of the cutter 100. A spring retainer 132 is coupled to the inner cutter 112 via a spring 134. The spring retainer 132 is fixedly attached to the outer cutter 114 (e.g., by a fastener 136). The spring 134 interconnects the spring retainer 132 to a yoke 128, allowing the yoke 128 to oscillate from the rotational output of the eccentric shaft 126.

[0019]

[0050] The yoke 128 is coupled to the inner cutters 112 and to an eccentric shaft 126 that is coupled to the motor 120. The yoke 128 oscillates the inner cutters 112 over the outer cutters 114 based on the rotational output of the motor 120 through the eccentric shaft 126. In other words, the spring retainer 132 is fixedly coupled to the outer cutters 114 and is coupled to the yoke 128 via a spring 134 to enable translation of the yoke 128 relative to the spring retainer 132. The yoke 128 is fixedly coupled to the inner cutters 112 and receives the output of the motor 120 through the eccentric shaft 126. Eccentric rotation of the eccentric shaft 126 oscillates the inner cutters 112 over the outer cutters 114. Referring to Figures 1 and 2, when the motor 120 rotates, the motor output shaft 122 rotates the eccentric drive 124 that is coupled to the eccentric shaft 126. As the eccentric shaft 126 rotates within the yoke 128, the inner cutter 112 oscillates above the outer cutter 114. As illustrated in FIG. 2 , a selector mechanism or adjustment slide 130 is slidably coupled along the trailing edge of the outer cutter 114. The operating slide 130 changes the orientation of the inner cutter 112 relative to the outer cutter 114 in a direction perpendicular to the oscillating behavior of the inner cutter 112. In various embodiments, the slide 130 is manually or electrically powered (e.g., by a motor).

[0020]

[0051] FIG. 3 is an exploded view of the blade assembly 104 illustrated in FIG. 2. A blade guide assembly, guide member, or T-guide 138 interconnects the inner cutter 112 to the slide 130. The T-guide 138 maintains the relative position of the inner cutting edge 166 with respect to the outer cutting edge 168. In other words, the T-guide 138 is coupled to both the inner cutter 112 and the slide 130. The T-guide 138 converts translation of the slide 130 along the trailing edge of the outer cutter 114 into translation of the inner cutter 112 in a direction transverse to the vibration behavior of the inner cutter 112. The T-guide 138 includes an angled edge 140 that fits within the slide 130. The angled edge 140 is angled so that movement of the slide 130 along the outer trailing edge of the outer cutter 114 causes the T-guide 138 to push or pull the inner cutter 112 along the top surface of the outer cutter 114. In this manner, the T-guide 138 extends or retracts the inner cutter 112 relative to the outer cutter 114 .

[0021]

[0052] In some embodiments, the outer cutter 114 includes a track, slot, or recess 142 for the T-guide 138. The recess 142 captures the T-guide between the inner cutter 112 and the outer cutter 114, orienting the T-guide 138 along the recess 142 and translating the inner cutter 112 relative to the outer cutter 114 in a direction transverse to the sliding behavior of the slider 130 along the trailing edge of the outer cutter 114.

[0022]

[0053] One or more fasteners 136 fixedly couple the outer cutter 114 to the spring retainer 132 and / or the body 102 ( FIG. 1 ). In the illustrated embodiment, two fasteners 136 on either side of the outer cutter 114 fixedly attach the outer cutter 114 to the spring retainer 132 such that the outer cutter 114 does not vibrate and / or is stationary relative to the vibration and lateral translation of the inner cutter 112. In this configuration, the outer cutter 114 is said to be fixed, stationary, or non-moving. In some embodiments, the inner cutter 112 moves relative to the outer cutter 114, and thus the inner cutter 112 and / or outer cutter 114 translate and / or vibrate. The inner cutter 112 vibrates in one direction relative to the outer cutter 114 to facilitate cutting hair and translates in an orthogonal or transverse direction to change the cutting length of the cutter 100 when the operator adjusts the slider 130.

[0023]

[0054] 3 shows the spring retainer 132 in a top perspective view. This view illustrates the linkage of the spring 134 coupled to the spring retainer 132 in the exemplary embodiment. Similarly, an end of the spring 134 is coupled to the yoke 128. Thus, the spring 134 biases the yoke 128 to a neutral rest position when the inner blade 112 oscillates in response to output from the motor 120.

[0024]

[0055] FIG. 4 is a bottom perspective view of the underside of the spring retainer 132 according to an exemplary embodiment. The spring retainer 132 includes a plurality of ridges 144 within a pair of pockets 146 at the rear (e.g., opposite cutting edges 116) of the spring retainer 132. The pockets 146 receive opposite ends (e.g., on either side) of the slide 130. The ridges 144 slidably attach to the ends of the slide 130 so that the slide 130 can slide or translate within the pockets 146. The ridges 144 within the pockets 146 releasably retain and / or lock the slide 130 within the detents formed by the ridges 144. In this manner, the ridges 144 allow translation and retention of the slide 130 along the trailing edge of the outer cutter 114. Thus, translation of the slide 130 along the trailing edge of the outer cutter 114 extends or retracts the inner cutter 112 to control the cut length. The spring retainer 132 includes fastener holes 148 for receiving fasteners 136 (FIG. 3) to fixedly couple the spring retainer 132 to the outer cutter 114 .

[0025]

[0056] 5 is an isolated top perspective view of the blade assembly 104, with structures of the blade assembly 104 removed to clearly illustrate the interaction of the inner cutter 112, outer cutter 114, slider 130, and T-guide 138. The inner cutter 112 includes inner cutter teeth 150. The outer cutter 114 includes outer cutter teeth 152. The shape of the outer cutter 114 can be convex so that translating the inner cutter 112 over the outer cutter increases the cutting length of the cutter 100. For example, the inner and / or outer cutter teeth 150 and / or 152 are thinner at the tips of the teeth 152 and thicker at the roots or bases of the teeth 152.

[0026]

[0057] The flanges 154 extend from either side of the slide 130 and include protrusions (detents) that fit within the detents of the ridges 144 (FIG. 4). As described above with reference to FIG. 3, the flanges 154 slide within the pockets 146 of the spring retainer 132. The flanges 154 are retained by the detents formed by the ridges 144, temporarily holding the slide 130. In this manner, the cutting length of the cutter 100 remains constant during operation. The slide 130 also includes gripping formations 156. The gripping formations 156 can be located on the top, bottom, and / or sides of the slide 130 to facilitate gripping and sliding of the slide 130 along the trailing edge of the outer cutter 114. The T-guide 138 includes a base, extension body, or arm 158 that couples the sliding translation of the cross section or guide rail 170 (FIG. 3) to the ridges below the inner cutter 112. The guide rails 170 of the T-guide 138 have a top side adjacent the inner cutter 112 and a bottom side adjacent the outer cutter 114. A pair of fastener holes 160 allow fasteners 136 to pass through the outer cutter 114 to fixedly couple the outer cutter 114 to the spring retainer 132 and / or body 102.

[0027]

[0058] Figure 6 is an isolated top view of the blade assembly 104 of Figure 5. The inner cutter 112 has inner teeth 150 that cooperatively oscillate over the outer teeth 152 of the outer cutter 114 to cut hair. As shown in Figures 5 and 6, the tips of the inner teeth 150 are recessed; that is, the tips of the inner teeth 150 are not aligned with the tips of the outer teeth 152. A T-guide 138 is shown in phantom below the inner cutter 112 and connects to the inner cutter 112 below the ridge.

[0028]

[0059] As the slider 130 translates in a first or vibration direction 162 (e.g., left and right), the inner cutter 112 translates in a second or transverse direction 164 (e.g., forward and backward). As shown, translation along the transverse direction 164 can be orthogonal to the vibration direction 162, but it can also include translation in other non-orthogonal directions. The elongate body or arm 158 ensures that translation of the slider 130 in the vibration direction 162 causes the inner cutter 112 and inner cutting edge 166 to translate in the transverse direction 164 to increase or decrease the distance (or gap) to the outer cutting edge 168.

[0029]

[0060] In some embodiments, the diagonal slot feature (e.g., arm 138 of slide 130) is coupled to the base or elongated arm 158 of T-guide 138 such that movement of slide 130 in a direction parallel to inner cutting edge 166 and / or outer cutting edge 168 moves guide rail 170 in a direction perpendicular to inner cutting edge 166 and / or outer cutting edge 168. In other words, slide 130 and channel 172 create a diagonal joint between arm 158 and guide rail 170.

[0030]

[0061] The elongated arm 158 interconnects a cross member or guide rail 170 (captured between the inner cutter 112 and outer cutter 114) of the T-guide 138 to the slide 130. The guide rail 170 is illustrated in phantom lines inside the slide 130 in FIG. 6. A channel 172 is disposed inside the slide 130 that pushes or pulls on the angled edge 140 as the slide 130 slides along the rear of the outer cutter 114. Because the channel 172 is located inside the slide 130, the channel 172 is also illustrated in phantom lines. The angled edge 140 and the channel 172 are slidably coupled, such that as the slide 130 translates in the first or vibration direction 162, the channel 172 pushes or pulls on the angled edge 140 inside the slide 130. Moving the slider 130 in the vibration direction 162 extends or retracts the guide rails 170 of the T-guide 138, which are coupled to the inner blade 112, in a second or transverse direction 164. This extends or retracts the inner blade 112 in the transverse direction 164 to control the cutting length of the cutter 100.

[0031]

[0062] In some embodiments, the guide rail 170 includes a magnetic tension assembly 174. For example, the guide rail 170 is a magnetized ferromagnetic material. In other embodiments, the guide rail 170 includes one or more magnets 176 and / or another electromagnetic device (e.g., a winding). The magnetic tension assembly 174 and / or magnets 176 generate an attractive (e.g., pulling) force between the blade guide assembly or T-guide 138 and the inner 112 and / or outer 114 blades. In some embodiments, the force is repulsive. In some embodiments, the magnetic pulling force between the guide rail 170 and the inner 112 and / or outer 114 blades is adjustable.

[0032]

[0063] In some embodiments, the inner cutters 112, outer cutters 114, yoke 128, and / or T-guide 138 are magnetized to create an attractive or repulsive force between the inner cutters 112 and outer cutters 114. In some embodiments, a magnetic assembly is located on at least one of the yoke 128, inner cutters 112, outer cutters 114, or T-guide 138. In other words, the inner cutters 112, outer cutters 114, yoke 128, T-guide 138, and / or any combination thereof create a magnetic field to adjust or control the pulling force (attraction or repulsion) between the inner cutters 112 and outer cutters 114. For example, the magnetized yoke 128 is a non-conductive magnetic carrier (e.g., a plastic yoke 128 carrying an iron magnet 176) or a conductive magnetic material. In some embodiments, a composite force is generated from multiple magnets 176 of relatively weak magnetic force to create a composite magnetic force from the multiple magnets 176. A variety of magnets can be used, reducing the overall cost of the magnetic assembly. Additionally, using magnetic forces to control the force between the blades 112 and 114 creates a reliable and efficient method for controlling the pulling force generated to maintain friction between the blades 112 and 114 while cutting hair.

[0033]

[0064] 6 shows the ridge 144 in cross section with the remainder of the spring retainer 132 removed. This view shows the interaction between the flange 154 of the slide 130 and the ridge 144 of the spring retainer 132. The flange 154 releasably locks within a detent formed in the ridge 144 to prevent unwanted movement of the slide 130 during operation. However, the interaction between the flange 154 and the ridge 144 is released when the operator slides the slide 130.

[0034]

[0065] 7-9 illustrate various configurations of the inner and outer cutters 112 and 114, illustrating how the slider 130 moves the inner cutter 112 relative to the outer cutter 114. The inner cutter 112 includes a plurality of inner cutting teeth 150. The inner cutting teeth 150 extend along an inner cutting edge 166. The inner cutting edge 166 is defined by an imaginary line connecting the tips of the inner cutting teeth 150. Similarly, the outer cutting edge 168 is defined by an imaginary line connecting the tips of the outer cutting teeth 152. The inner cutter 112 is positioned above (seated on) the outer cutter 114, and the inner cutting edge 166 is parallel to, and in some embodiments, offset from, the outer cutting edge 168. During operation, the inner cutting edge 166 and the outer cutting edge 168 oscillate relative to one another. The distance between an imaginary line formed along the inner cutting edge 166 and an imaginary line formed along the outer cutting edge 168 is defined as the blade gap 178 .

[0035]

[0066] Movement of the slider 130 translates the inner cutter 112 relative to the outer cutter 114, which changes the position of the eccentric shaft 126 within the yoke 128. The yoke 128 is configured to receive the eccentric shaft 126 of the drive assembly 106 to oscillate the inner cutter 112 at a desired blade gap 178. As illustrated in FIGS. 7-9 , three positions or configurations of the inner cutter 112 relative to the outer cutter 114 are shown: "fine," "medium," and "deep" configurations. For example, the three configurations represent a fine gap, a medium gap larger than the fine gap, and a long gap larger than either the fine gap or the medium gap between the inner cutting edge 166 and the outer cutting edge 168. Additional preset configurations can produce larger medium gaps and / or cutting lengths. The slider 130 can accommodate two or more predetermined blade gaps 178 between the inner cutting edge 166 and the outer cutting edge 168. For example, the slide 130 can include 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, or more steps or predetermined configurations.

[0036]

[0067] The slide 130 can include phrases or inscriptions (e.g., "deep" and "fine") as well as tactile and / or visual indicators to indicate which slide 130 configuration will result in a longer "deep" or shorter "fine" cut. For example, a single bump (e.g., "fine") on one side of the slide 130 and two or more bumps (e.g., "deep") on the other side provide both a visual and tactile indication of the blade gap 178 in either configuration. Similarly, a short line on one side of the slide 130 and a long line on the other side provide a visual and / or tactile indication of the cut length at the slide 130 position.

[0037]

[0068] 7 illustrates a first fully extended inner cutter 112 with the slider 130 in the "fine" cut configuration. This position is referred to as the aligned position because the inner cutting edge 166 and outer cutting edge 168 are collinear. In this configuration, the inner cutter 112 is aligned with the outer cutter 114 such that the inner cutting edge 166 of the inner cutting teeth 150 is aligned with the outer cutting edge 168 of the outer cutting teeth 152. Because of this alignment, no or a relatively small blade gap 178 exists between the inner cutting edge 166 and outer cutting edge 168.

[0038]

[0069] As shown, the slider 130 is not centered on the outer cutter 114, but is located closer to the first fastener hole 160 (left side) than to the second fastener hole 160 (right side). In other words, the slider 130 is located on a first side (e.g., left of center) along the edge of the outer cutter 114 to extend the T-guide 138 the greatest distance. This outer cutter edge 168 configuration places the outer cutter edge 168 close to the inner cutter edge 166 to create a small or non-existent blade gap 178. As a result, the inner cutter edge 166 is fully extended and / or aligned with the outer cutter edge 168 to create a short or "fine" cutting length.

[0039]

[0070] 7, the left flange 154 extends further along the ridge 144 than the opposite right flange 154. Stated differently, the left ridge 144 is almost completely within the left flange 154, and the right ridge 144 extends almost completely within the right flange 154 of the slide 130. In this configuration, the channel 172 pushes the guide rail 170 a maximum distance, resulting in full extension of the inner cutting teeth 150 and / or inner cutting edges 166.

[0040]

[0071] FIG. 8 shows a second or centered position of the inner cutter 112 relative to the outer cutter 114. In this configuration, the slide 130 is centered on either side of the ridge 144 so that the flanges 154 extend an equal distance above the ridges 144 on either side. The flanges 154 extend an equal distance above the ridges 144 on both sides of the slide 130. This configuration centers the channel 172 so that the T-guide 138 and guide rail 170 are centered and the arm 158 is centered within the slide 130. The inner cutting edge 166 is in an intermediate position, neither fully extended nor fully retracted. The inner cutting edge 166 of the inner cutter 112 is halfway between fully extended and fully retracted above the outer cutting edge 168 of the outer cutter 114, forming an intermediate-sized blade gap 178. This configuration produces an intermediate or "mid-length" cut.

[0041]

[0072] FIG. 9 shows the inner cutter 112 fully retracted. The slider 130 extends fully to the right. The slider 130 is closer to the second fastener hole 160 on the right side than the first fastener hole 160 on the left side, providing a visual indication to the operator of a longer cut. The right ridge 144 is almost completely within the right flange 154, and the left ridge 144 extends almost completely within the left flange 154. In this configuration, the inner cutter 112 is fully retracted along with the outer cutter 114, such that the inner cutting edge 166 is maximally displaced from the outer cutting edge 168. This configuration retracts or displaces the angled edge 140 the greatest distance from the outer cutting edge 168, maximizing the blade gap 178 length. Therefore, the cut hair length of the cutter 100 is maximized, creating a long or "deep" cut length.

[0042]

[0073] 10-13 illustrate another embodiment of a cutter 200 with a blade assembly 204. The blade assembly 204 includes an inner blade 212 with an upper body 213 and an outer blade 214 with a lower body 215. The embodiment of cutter 200 is substantially identical to or similar to the embodiment of cutter 100 illustrated in FIGS. 1-9, except for the differences described. In contrast to the embodiment of cutter 100, the embodiment of cutter 200 includes a U-shaped portion 280 that defines a guide channel 282 and a guide body 284 (FIGS. 11-12). Similar components of cutter 200 are assigned the same reference numerals as cutter 100, beginning with 200.

[0043]

[0074] 10 shows an inner cutter 212, an inner body 213, and a plurality of inner cutting teeth 250. The inner cutting teeth 250 extend along an inner cutting edge 266. The inner cutting edge 266 is defined by an imaginary line connecting the tips of the inner cutting teeth 250. The outer cutter 214 includes a body 215 and a plurality of outer cutting teeth 252. The outer cutting teeth 252 extend along an outer cutting edge 268. The outer cutting edge 268 is defined by an imaginary line connecting the tips of the outer cutting teeth 252. In some embodiments, the inner cutting edge 266 and the outer cutting edge 268 are defined as lines connecting the roots (rather than the tips) of the teeth 250 and / or 252. The upper blade 212 is positioned (seated) above the outer blade 214, and the inner cutting edge 266 is parallel to and offset from the outer cutting edge 268 by a blade gap 278. The distance between the inner cutting edge 266 and the outer cutting edge 268 is defined as the blade gap 278.

[0044]

[0075] In some embodiments, the inner blades 212, outer blades 214, yoke 228, and / or blade guide assembly 286 are magnetized to create an attractive or repulsive force between the inner blades 212 and outer blades 214. For example, a magnetic assembly is located on at least one of the yoke 228, inner blades 212, outer blades 214, or T-guide 238. In other words, the inner blades 212, outer blades 214, yoke 228, T-guide 238, and / or any combination thereof create a magnetic field to adjust or control the pulling force (attraction or repulsion) between the inner blades 212 and outer blades 214. For example, the magnetized yoke 228 is a non-conductive magnet carrier (e.g., a plastic yoke 228 carrying an iron magnet 276) or a conductive magnetic material. In some embodiments, a composite force is generated from multiple magnets 276 of relatively weak magnetic force to create a composite magnetic force from the multiple magnets 276. A variety of magnets can be used, reducing the overall cost of the magnetic assembly. Additionally, using magnetic forces to control the force between the blades 212 and 214 creates a reliable and efficient method for controlling the pulling force generated to maintain friction between the blades 212 and 214 while cutting hair.

[0045]

[0076] 11-13 , the blade guide assembly 286 includes a blade guide 288 and a protrusion 292 that is received in a slot 290 within the outer cutter 214. The blade guide assembly 286 maintains the relative position of the inner cutting edge 266 with respect to the outer cutting edge 268. The slot 290 is positioned within the body 215 and extends parallel to the outer cutting edge 268. In other embodiments, the slot 290 is oriented in any suitable direction with respect to the outer cutting edge 268. The blade guide 288 is also coupled to the outer cutter 214. For example, the blade guide 288 may be fastened by a friction fit (e.g., the protrusion 292 is frictionally received in the slot 290, etc.), adhesive, and / or any suitable fastener (e.g., a screw, etc.). Receiving the protrusion 292 orients the blade guide 288 with respect to the outer cutter 214 to facilitate guiding the inner cutter 212.

[0046]

[0077] 11-12 , the U-shaped portion 280 defines a guide channel 282 and a guide body 284. The guide channel 282 receives the end of the inner blade 212 opposite the inner cutting edge 266 (e.g., the trailing end or edge of the inner blade 212). The guide channel 282 is oriented parallel to the inner cutting edge 266 to facilitate reciprocating (or lateral) guiding of the inner blade 212 relative to the outer cutter 214 during vibration. The guide body 284 extends away from the guide channel 282 and is positioned between the inner cutter 212 and the outer cutter 214. The guide body 284 has a top side adjacent the inner cutter 212 and a bottom side adjacent the outer cutter 214.

[0047]

[0078] In some embodiments, the blade assembly 204 includes a magnetic tension assembly 274. The magnetic tension assembly 274 uses electromagnetic force to apply an attractive or tensioning force between the inner cutter 212 and the outer cutter 214, for example, between the blade assembly 204 and the inner cutter 212 and / or the outer cutter 214. In some embodiments, the magnetic tension assembly 274 replaces a conventional spring-based system that applies tension between the blades 212 and 214. The attractive tensioning force maintains the position (up and down) of the inner cutter 212 relative to the outer cutter 214 during oscillatory reciprocation (e.g., haircutting).

[0048]

[0079] As will be described in detail below, in some embodiments, the magnetic pulling force between the inner cutters 212 and / or outer cutters 214 is adjustable. In some embodiments, the magnetic polarity is reversed so that the magnetic force repels the inner cutters 212 and outer cutters 214 (e.g., creates a repulsive force on the cutters 212 and 214).

[0049]

[0080] The magnetic tension assembly 274 includes a magnetized ferromagnetic material and / or at least one magnet 276 positioned between the inner blades 212 and outer blades 214. The illustrated bar magnet 276 is sandwiched between the inner blades 212 and outer blades 214. In other embodiments, the magnet 276 includes any suitable electromagnetic force (e.g., permanent magnet, poly magnet, electric coil, etc.) or shape (e.g., circular, oblong, or magnetized cross member or guide rail 270). In some embodiments, the magnet 276 includes multiple magnets positioned between the inner blades 212 and outer blades 214. The magnet 276 is fastened (or otherwise coupled) to the outer blades 214. For example, the magnet 276 is fastened by adhesive, fasteners (e.g., screws, etc.), or any other suitable fastening device. The magnet 276 then applies an attractive magnetic force or pulling force to the inner blades 212 during vibration. Stated another way, the inner cutter 212 is drawn toward the outer cutter 214 by the magnet 276. The attractive pulling force applied by the magnet 276 allows the inner cutter 212 to reciprocate relative to the outer cutter 214 while maintaining the position of the inner cutting edge 266 relative to the outer cutting edge 268. The magnet 276 is captured between the blades 212 and 214 to apply a magnetic attractive (e.g., pulling) force to the inner cutter 212, which provides improved tension control of the inner cutter 212 during reciprocation.

[0050]

[0081] During operation, the motor 220, via the drive assembly 206 and / or transmission (not shown), drives the reciprocating movement of the inner cutter 212 relative to the outer cutter 214. During reciprocating movement of the inner cutter 212, the blade guide assembly 286 guides the reciprocating movement of the inner cutter 212 relative to the outer cutter 214 to maintain a constant blade gap 186. Additionally, the magnetic tension assembly 274 applies a magnetic pulling force to the inner cutter 212 to maintain the position of the inner cutting edge 266 relative to the outer cutting edge 268 to reduce friction and facilitate a uniform cut.

[0051]

[0082] 14-17 illustrate another embodiment of a cutter 300 including a blade assembly 304. The blade assembly 304 includes an inner blade 312 with an upper body 313 and an outer blade 314 with a lower body 315. The embodiment of cutter 300 is substantially identical to or similar to the embodiments of cutters 100 and 200, except for the differences described. In contrast to the embodiments of cutters 100 and 200, the embodiment of 300 includes an alternative fastener 336 for the blade guide assembly 306 for the outer blade 314. In addition, the blade assembly 304 of cutter 300 includes an alternative embodiment of a magnetic tension assembly 374. Similar components of cutter 300 are assigned the same reference numerals as cutters 100 and 200, beginning with 300.

[0052]

[0083] In some embodiments, the inner blades 312, outer blades 314, yoke 328, and / or blade guide assembly 386 are magnetized to create an attractive or repulsive force between the inner blades 312 and outer blades 314. For example, a magnetic assembly is located on at least one of the yoke 328, inner blades 312, outer blades 314, or T-guide 338. In other words, the inner blades 312, outer blades 314, yoke 328, blade guide assembly 386, and / or any combination thereof create a magnetic field to adjust or control the pulling force (attraction or repulsion) between the inner blades 312 and outer blades 314. For example, the magnetized yoke 328 is a non-conductive magnet carrier (e.g., a plastic yoke 328 carrying an iron magnet 376) or a conductive magnetic material. In some embodiments, a composite force is generated from multiple magnets 376 of relatively weak magnetic force to create a composite magnetic force from the multiple magnets 376. A variety of magnets can be used, reducing the overall cost of the magnetic assembly. Additionally, using magnetic forces to control the force between the blades 312 and 314 creates a reliable and efficient method for controlling the pulling force generated to maintain friction between the blades 312 and 314 while cutting hair.

[0053]

[0084] 15-16 illustrate the protrusion 392 of the blade guide 388 having a geometry configured to be received by a complementary geometry of the slot 390 of the outer cutter 314 of the body 315. Specifically, the protrusion 392 defines a trapezoidal cross-sectional shape that is received by the trapezoidal slot 390. This allows the protrusion 392 to be captured and slidably received by the slot 390 while simultaneously fastening (or otherwise retaining) the blade guide assembly 386 to the outer cutter 314. The blade guide assembly 386 maintains the relative position of the inner cutting edge 366 with respect to the outer cutting edge 368. In effect, the protrusion 392 and the slot 390 together form a dovetail joint (or dovetail joint) to provide resistance to separation. The protrusion 392 can have any suitable cross-sectional shape (e.g., geometric, triangular, etc.) that is received by the complementary cross-sectional shape defined by the slot 390 to fasten the blade guide assembly 386 to the outer cutter 314.

[0054]

[0085] 14-17 illustrate a blade assembly 304 with a magnetic tension assembly 374. The magnetic tension assembly 374 includes a first, upper, or top magnet holder 394 coupled to the outer blade 314 by a fastener 336 (e.g., as shown in FIG. 14). The top magnet holder 394 includes a pair of arms or extensions 396a, 396b that hold (or grip) a first, upper, or top magnet 376a. In other words, the top magnet 376a is fastened to the extensions 396a and 396b (e.g., by adhesive, fasteners such as screws or bolts, etc.). The top magnet 376a is illustrated as a bar magnet 376. However, in other embodiments, the top magnet 376a is any suitable magnet 376 or multiple magnets 376. The extensions 396a and 396b of the upper magnet holder 394 extend above the inner blade 312. The upper magnet holder 394 is positioned on the side of the inner blade 312 opposite the side facing the outer blade 314.

[0055]

[0086] 15-17, a second, bottom, or lower magnet 376b is fastened to the inner blade 312 (e.g., by adhesive, fasteners such as screws or bolts, etc.). The bottom magnet 376b is illustrated as a bar magnet 376b. However, in other embodiments, the bottom magnet 376b is any suitable magnet 376 or multiple magnets 376. The bottom magnet 376b is positioned on the side of the inner blade 312 opposite the side facing the outer blade 314. Thus, the top magnet 376a and the bottom magnet 376b are in an opposite, opposing, facing relationship or orientation to each other. In this configuration, the top magnet 376a is stationary (e.g., grasped by extensions 396a and 396b coupled to the outer blade 314), while the bottom magnet 376b is coupled to the inner blade 312 and configured to move or vibrate with the inner blade 312 during operation. Thus, the bottom magnet 376b reciprocates with the inner blade 312.

[0056]

[0087] In some embodiments, the top magnet 376 and the bottom magnet 376b are magnets with the same polarity such that the inner cutter 312 and the outer cutter 314 experience a repulsive force. In some embodiments, the top magnet 376 and the bottom magnet 376b have opposite polarities such that the inner cutter 312 and the outer cutter 314 experience an attractive force. Thus, the orientation of the magnets 376a and 376b is such that they magnetically repel each other. The magnets 376a and 376b push or repel each other, and the bottom magnet 376b pushes the inner cutter 312 toward the outer cutter 314. This generates a magnetic force that separates the blades 312 and 314, maintaining the position of the inner cutting edge 366 relative to the outer cutting edge 368 during operation and reducing frictional loads to facilitate cutting. As will be described in more detail below, in some embodiments, the magnetic force between the inner cutter 312 and / or the outer cutter 314 is adjustable.

[0057]

[0088] 18-21 illustrate another embodiment of a cutter 400 including a blade assembly 404. The blade assembly 401 includes an inner blade 412 coupled to an outer blade 414. The embodiment of cutter 400 is substantially identical to or similar to the embodiments of cutters 100, 200, and 300, except for the differences described. In contrast to the embodiments of cutters 100, 200, and 300, the embodiment of cutter 400 includes a blade assembly 404 with an alternative embodiment of a magnetic tension assembly 474 and a blade guide assembly 486. The blade assembly 404 is shown coupled to the embodiment of cutter 400. Similar components of cutter 400 are assigned the same reference numerals as cutter 100, beginning with 400.

[0058]

[0089] In some embodiments, the inner blades 412, outer blades 414, yoke 428, and / or blade guide assembly 486 are magnetized to create an attractive or repulsive force between the inner blades 412 and outer blades 414. For example, a magnetic assembly is located on at least one of the yoke 428, inner blades 412, outer blades 414, or blade guide assembly 438. In other words, the inner blades 412, outer blades 414, yoke 428, blade guide assembly 486, and / or any combination thereof create a magnetic field to adjust or control the pulling force (attraction or repulsion) between the inner blades 412 and outer blades 414. For example, the magnetized yoke 428 is a non-conductive magnet carrier (e.g., a plastic yoke 428 carrying an iron magnet 476) or a conductive magnetic material. In some embodiments, a composite force is generated from multiple magnets 476 of relatively weak magnetic force to create a composite magnetic force from the multiple magnets 476. A variety of magnets can be used, reducing the overall cost of the magnetic assembly. Additionally, using magnetic forces to control the force between blades 412 and 414 creates a reliable and efficient method for controlling the pulling force generated to maintain friction between blades 412 and 414 while cutting hair.

[0059]

[0090] 18-19 illustrate a blade guide assembly 486 including a guide member 480 defining a guide surface 482. The blade guide assembly 486 maintains the relative position of the inner cutting edge 466 with respect to the outer cutting edge 468. The guide surface 482 is an angled surface configured to engage a portion of the inner blade 412. More specifically, the guide surface 482 engages an end of the inner blade 412 opposite the inner cutting edge 466 (e.g., the rear end of the inner blade 412). The upper blade 412 is configured to slide along the guide surface 482 during reciprocation to guide the reciprocating motion of the inner blade 412 relative to the outer blade 414 and maintain a constant gap 478. In some embodiments, the guide assembly 486 is a guide rail 470 of the T-guide 438 and is the same as or similar to the T-guide 138 and / or the guide rail 170. In this configuration, the guide rail 470 of the T-guide 438 is captured between the inner and outer cutters and has a top side adjacent the inner cutter 412 and a bottom side adjacent the outer cutter 414 .

[0060]

[0091] 19 illustrates a blade guide assembly 486 with a blade gap adjustable lever 430. In some embodiments, the adjustable lever 430 is similar to the slide 130 and operates to change the length of the gap 478. For example, rotation of the adjustment lever 430 slides or translates the guide member 480 forward or backward transversely relative to the oscillatory behavior of the inner cutter 412. When the guide member 480 moves forward, the inner cutter 412 also moves forward, decreasing the blade gap 478. When the guide member 480 moves backward, the inner cutter 412 also moves backward, increasing the blade gap 478.

[0061]

[0092] 20-21 illustrate the magnetic tension assembly 474 of the cutter 400. The magnetic tension assembly 474 includes a magnet 476, illustrated as a disk magnet 476. The magnet 476 can be any suitable magnet 476 or multiple magnets 476. The magnet 476 is positioned on the side of the inner blade 412 opposite the side facing the outer blade 414. The magnet 476 provides a magnetic pulling force that attracts the inner blade 412 toward the outer blade 414. The magnetic pulling force is sufficient to pull the inner blade 412 toward the outer blade 414. This creates a magnetic tension that maintains the position of the inner cutting edge 466 relative to the outer cutting edge 468 during operation, facilitating cutting.

[0062]

[0093] In some embodiments, the magnetic pulling force between the inner cutters 412 and / or outer cutters 414 is adjustable. In some embodiments, the magnetic polarity is reversed so that the magnetic force repels the inner cutters 412 and / or outer cutters 414.

[0063]

[0094] 22-23 illustrate another embodiment of a cutter 500 including a blade assembly 504. The blade assembly 504 includes an inner cutter 512 and an outer cutter 514. The embodiment of the cutter 500 is substantially the same as or similar to the embodiment of FIGS. 1-21, except for the differences described. In contrast to the embodiment of FIGS. 1-21, the blade assembly 504 includes an alternative embodiment of a magnetic tension assembly 574 and a blade guide assembly 586. The blade guide assembly 586 maintains the relative position of the inner cutting edge 566 with respect to the outer cutting edge 568. The blade assembly 504 is shown coupled to the embodiment of the cutter 500. Similar components of the cutter 500 are assigned the same reference numerals as the cutter 100, beginning with 500.

[0064]

[0095] In some embodiments, the inner blades 512, outer blades 514, yoke 528, and / or blade guide assembly 586 are magnetized to create an attractive or repulsive force between the inner blades 512 and outer blades 514. For example, a magnetic assembly is located on at least one of the yoke 528, inner blades 512, outer blades 514, or blade guide assembly 586. In other words, the inner blades 512, outer blades 514, yoke 528, blade guide assembly 586, and / or any combination thereof create a magnetic field to adjust or control the pulling force (attraction or repulsion) between the inner blades 512 and outer blades 514. For example, the magnetized yoke 528 is a non-conductive magnet carrier (e.g., a plastic yoke 528 carrying an iron magnet 576) or a conductive magnetic material. In some embodiments, a composite force is generated from multiple magnets 576 of relatively weak magnetic force to create a composite magnetic force from the multiple magnets 576. A variety of magnets can be used, reducing the overall cost of the magnetic assembly. Additionally, using magnetic forces to control the force between blades 512 and 514 creates a reliable and efficient method for controlling the pulling force generated to maintain friction between blades 512 and 514 while cutting hair.

[0065]

[0096] In some embodiments, the guide assembly 586 includes a guide rail 570 of the T-guide 538, which is the same as or similar to the T-guide 138 and / or the guide rail 170. In this configuration, the guide rail 570 of the T-guide 538 is captured between the inner cutter 512 and the outer cutter 514 and has a top side adjacent the inner cutter 512 and a bottom side adjacent the outer cutter 514.

[0066]

[0097] The magnetic tension assembly 574 is substantially the same as the magnetic tension assembly 474, with like numbers identifying like components. The magnetic tension assembly 574 includes a metal member 598 coupled to the outer blade 514 (e.g., with an adhesive and / or fasteners). The metal member 598 is positioned on the outer blade 514 and sandwiched between the inner blade 512 and the outer blade 514. Stated another way, the metal member 598 is positioned on the inner side of the outer blade 514 facing the inner blade 512 and between the inner blade 512 and the outer blade 514. The metal member 598 provides an additional surface or material that attracts the magnet 576. In this manner, the metal member 598 engages the attractive magnetic force emanating from the magnet 576, which attracts the inner blade 512 toward the outer blade 514, thereby pulling the inner blade 512 toward the outer blade 514. The generated magnetic tension maintains the position of the inner cutting edge 178 relative to the outer cutting edge 568 during operation. In this embodiment, the blades 512 and / or 514 need not be metal components; for example, the blades 512 or 514 are plastic or composite parts.

[0067]

[0098] Metal member 598 can be any suitable ferromagnetic material or other suitable material that is attracted by magnetic force to magnet 576. In some embodiments, metal member 598 is magnetized with the same polarity as magnet 576 such that inner cutter 512 and outer cutter 514 are repelled. As will be explained in more detail below, in some embodiments, the magnetic force between inner cutter 512 and / or outer cutter 514 is adjustable or measurable.

[0068]

[0099] 24-26 illustrate another embodiment of a cutter 600 including a blade assembly 604. The blade assembly 604 includes an inner blade 612 and an outer blade 614. The embodiment of the cutter 600 is substantially the same as or similar to the embodiment of FIGS. 1-23, except for the differences described. In contrast to the embodiment of FIGS. 1-23, the cutter 600 includes an alternative blade guide assembly 686 including an alternative embodiment of a magnetic tension assembly 674. Similar components of the cutter 600 are assigned the same reference numerals as the cutter 100, beginning with 600. As will be described in detail below, in some embodiments, the magnetic tension force between the inner blade 612 and / or the outer blade 614 is adjustable.

[0069]

[0100] In some embodiments, the inner blades 612, outer blades 614, yoke 628, and / or T-guide 638 are magnetized to create an attractive or repulsive force between the inner blades 612 and outer blades 614. For example, a magnetic assembly is located on at least one of the yoke 628, inner blades 612, outer blades 614, or T-guide 638. In other words, the inner blades 612, outer blades 614, yoke 628, T-guide 638, and / or any combination thereof create a magnetic field to adjust or control the pulling force (attraction or repulsion) between the inner blades 612 and outer blades 614. For example, the magnetized yoke 628 is a non-conductive magnetic carrier (e.g., a plastic yoke 628 carrying an iron magnet 676) or a conductive magnetic material. In some embodiments, a composite force is generated from multiple magnets 676 with relatively weak magnetic forces to create a composite magnetic force from the multiple magnets 676. A variety of magnets can be used, reducing the overall cost of the magnetic assembly. Additionally, using magnetic forces to control the force between blades 612 and 614 creates a reliable and efficient method for controlling the pulling force generated to maintain friction between blades 612 and 614 while cutting hair.

[0070]

[0101] 24-26 show a blade guide assembly 686 with a guide member 680. The blade guide assembly 686 maintains the relative position of the inner cutting edge 666 with respect to the outer cutting edge 668. In some embodiments, the guide member 680 is the same as or similar to the T-guide 138. The guide member 680 is T-shaped and is mounted to the outer cutter 614 by an adjustment assembly 699 (shown in FIG. 24). In this configuration, the cross member 670 of the T-guide 638 is captured between the inner cutter 612 and the outer cutter 614 and has a top side adjacent to the inner cutter 612 and a bottom side adjacent to the outer cutter 614. In some embodiments, the adjustment assembly 699 includes the slider 130, the lever 430, and / or the lever 630. The adjustment assembly 699 operates to translate the inner cutter 612 over the outer cutter 614 to increase or decrease the gap 678. The T-shaped guide member 680 includes a guide base 658 (identical to or similar to the extension arm 158) and a cross member portion or guide rail 638 (identical to or similar to the guide rail 138). The outline of the guide rail 638 is shown in dashed lines in FIG. 24.

[0071]

[0102] The guide rail 638 is positioned between the inner cutter 612 and the outer cutter 614 (FIGS. 25-26). The adjustment assembly 699 includes a lever 630 (FIG. 24) that facilitates movement of the inner cutter 612 relative to the outer cutter 614 to adjust the blade gap 678. Specifically, movement of the lever 630 in a first direction occurs along a base opposite the lower cutting edge 668 of the outer cutter 614, providing a translational force to the guide base 658 in a direction transverse to the vibration direction. The translational force moves the guide member 680 in a translational direction (e.g., forward). The guide member 680 translates the inner cutter 612 in the same translational direction (e.g., forward) to increase / decrease the blade gap 678. For example, movement of the lever 630 in the opposite direction (e.g., rearward) generates a translational force on the guide base 658, translating the guide member 680 back to its original position. The guide members 680 couple to the inner blades 612 to translate the blades 612 in the same direction to increase or decrease the blade gap 678 .

[0072]

[0103] 25-26 illustrate a magnetic tension assembly 674. The magnetic tension assembly 674 includes magnets 676, illustrated as a plurality of disk magnets 676. The magnets 676 can be any suitable magnet 676 or plurality of magnets 676. The magnets 676 are positioned on or coupled to a guide member 680. In some embodiments, the guide member 680 is the same as or similar to the T-guide 638. The magnets 676 are fastened to the guide rail 638 and / or the guide rail 638 of the cross member 670. For example, the magnets 676 are disk magnets 676 configured to be received in associated apertures defined in the cross member 670 or the guide rail 638. The magnets 676 are slidably received by the associated apertures and have a geometry (e.g., a "top hat" geometry, etc.) that facilitates retention. In other embodiments, the magnet 676 is coupled (e.g., by adhesive, fasteners, etc.) to the guide rail 638 or cross member 670. The magnet 676 is positioned to face the underside of the inner blade 612 or the inside of the inner blade 612 that faces the guide member 680. The magnet 676 engages the inner blade 612 and provides an attractive magnetic force that pulls the inner blade 612 toward the guide member 680 (and thereby toward the outer blade 614). The magnetic force is sufficient to create an attractive magnetic tension between the blades 612 and 614, maintaining the position of the inner cutting edge 666 relative to the outer cutting edge 668 during operation, reducing the load on the motor 620 and making cutting easier.

[0073]

[0104] 27-30 illustrate another embodiment of a cutter 700 with a blade assembly 704. The blade assembly 704 includes an inner cutter 712 and an outer cutter 714. A blade guide assembly 786 maintains the relative position of the inner cutting edge 766 with respect to the outer cutting edge 768. In some embodiments, the guide assembly 786 includes a guide rail 770 of a T-guide 738, which is the same as or similar to the T-guide 138 and / or the guide rail 170. In this configuration, the guide rail 770 of the T-guide 738 is captured between the inner cutter 712 and the outer cutter 714 and has a top side adjacent the inner cutter 712 and a bottom side adjacent the outer cutter 714.

[0074]

[0105] The embodiment of cutter 700 is substantially the same as or similar to the embodiment of Figures 1-26, except for the differences described. In contrast to the embodiment of Figures 1-26, cutter 700 includes an alternative embodiment of a magnetic tension assembly 774 that includes an electromagnet 776.

[0075]

[0106] In some embodiments, the inner blades 712, outer blades 714, yoke 728, T-guide 738, and / or blade guide assembly 786 are magnetized to create an attractive or repulsive force between the inner blades 712 and outer blades 714. For example, a magnetic assembly is located on at least one of the yoke 728, inner blades 712, outer blades 714, T-guide 738, or blade guide assembly 786. In other words, the inner blades 712, outer blades 714, yoke 728, T-guide 738, blade guide assembly 786, and / or any combination thereof create a magnetic field to adjust or control the pulling force (attraction or repulsion) between the inner blades 712 and outer blades 714. For example, the magnetized yoke 728 is a non-conductive magnet carrier (e.g., a plastic yoke 728 carrying an iron magnet 776) or a conductive magnetic material. In some embodiments, the composite force is generated from multiple magnets 776 of relatively weak magnetic force to create a composite magnetic force from the multiple magnets 776. A variety of magnets can be used, reducing the overall cost of the magnetic assembly. Additionally, using magnetic force to control the force between the blades 712 and 714 creates a reliable and efficient method for controlling the pulling force generated to maintain friction between the blades 712 and 714 while cutting hair.

[0076]

[0107] 28-29, the electromagnet 776 includes a member 711 with a winding 733. The electromagnet 776 is coupled to the inner blade 712. More specifically, the member 711 includes a first end 755 and a second end 777 (shown in FIG. 29). The first and second ends 755 and 777 extend through the inner blade 712 and contact the outer blade 714. In operation, electricity (or a charge or current) is applied to the winding 733 to magnetize the member 711. A magnetic field extends through the first and second ends 755 and 777 to engage the outer blade 714. The ends 755 and 777 concentrate the magnetic flux to provide an attractive magnetic force (e.g., a tension or pulling force) that engages the outer blade 714 and draws the inner blade 712 toward the outer blade 714. The magnetic force is sufficient to create a magnetic tension that maintains the position of the inner cutting edge 766 relative to the outer cutting edge 768 during operation. Thus, ends 755 and 777 act as magnetic conduits (or electromagnets) to pull the inner cutting edge 712 toward the outer cutting edge 714.

[0077]

[0108] The current or voltage (or charge) supplied from the magnetic tension assembly 774 to the electromagnet 776 can be related to the operation of the cutter 700. Specifically, a load sensor 788 is incorporated into the cutter 700 to detect an increase and / or decrease in the load or speed on the motor 720. The change in the load or speed of the motor 720 is proportional to the friction load or speed between the blades 712 and 714. The sensor 788 sends a signal to the electromagnet 776 indicative of the load and / or speed change of the motor 720 to increase or decrease the magnetic force between the inner blades 712 and 714. The change in load on the motor 720 is indicative of and / or proportional to the friction load (and / or speed) between the blades 712 and 714 experienced during hair cutting. If the detected load increases or speed decreases, the voltage and / or power supplied to the electromagnet 776 is increased to improve the tension between the inner blades 712 and 714. For example, if the sensor 788 detects a changed load on the motor 720 or a change in speed between the motor 720, the inner blade 712 and / or the outer blade 714, the sensor 788 sends a signal to the electromagnet 776 to increase the current in the magnetic tension assembly 774, increasing the magnetic attractive or pulling force between the guide member 780 and the inner blade 712 and outer blade 714, reducing the frictional load and reducing the load on the motor 720.

[0078]

[0109] 31-32 illustrate another embodiment of a cutter 800 with a blade assembly 804. The blade assembly 804 includes an inner cutter 812 and an outer cutter 814. A blade guide assembly 886 maintains the relative position of the inner cutting edge 866 with respect to the outer cutting edge 868. In some embodiments, the guide assembly 886 includes a guide rail 870 of the T-guide 838, which is the same as or similar to the T-guide 138 and / or the guide rail 170. In this configuration, the guide rail 870 of the T-guide 838 is captured between the inner cutter 812 and the outer cutter 814 and has a top side adjacent the inner cutter 812 and a bottom side adjacent the outer cutter 814.

[0079]

[0110] The embodiment of cutter 800 is substantially identical to or similar to the embodiment of Figures 1-30, except for the differences described. In contrast to the embodiment of Figures 1-27, cutter 800 includes an alternative embodiment of magnetic tension assembly 874. Magnetic tension assembly 874 includes an electromagnet 876 coupled to outer blade 814. Magnetic tension assembly 874 is substantially identical to or similar to magnetic tension assembly 774 and electromagnet 776 (Figures 27-30), except for the differences described. In contrast to magnetic tension assembly 774, magnetic tension assembly 874 is coupled to the outer blade (Figures 31-32), while magnetic tension assembly 774 is coupled to the inner blade 712 (Figures 27-30).

[0080]

[0111] In some embodiments, the inner blades 812, outer blades 814, yoke 828, T-guide 838, and / or blade guide assembly 886 are magnetized to create an attractive or repulsive force between the inner blades 812 and outer blades 814. For example, a magnetic assembly is located on at least one of the yoke 828, inner blades 812, outer blades 814, T-guide 838, or blade guide assembly 886. In other words, the inner blades 812, outer blades 814, yoke 828, T-guide 838, blade guide assembly 886, and / or any combination thereof create a magnetic field to adjust or control the pulling force (attraction or repulsion) between the inner blades 812 and outer blades 814. For example, the magnetized yoke 828 is a non-conductive magnet carrier (e.g., a plastic yoke 828 carrying an iron magnet 876) or a conductive magnetic material. In some embodiments, the composite force is generated from multiple magnets 876 of relatively weak magnetic force to create a composite magnetic force from the multiple magnets 876. A variety of magnets can be used, reducing the overall cost of the magnetic assembly. Additionally, using magnetic force to control the force between the blades 812 and 814 creates a reliable and efficient method for controlling the pulling force generated to maintain friction between the blades 812 and 814 while cutting hair.

[0081]

[0112] The first and second ends 855 and 877 of the magnetic tension assembly 874 extend through the outer blade 814 and contact the inner blade 812. During operation, electricity (or a charge or current) is applied to the winding 833 to magnetize the member 811. A magnetic field extends through the first end 855 and the second end 877 to engage the inner blade 812. The ends 855 and 877 concentrate the magnetic flux to provide an attractive magnetic force (e.g., tension) that engages and draws the inner blade 812 toward the outer blade 814. The magnetic force is sufficient to generate a magnetic tension that maintains the position of the inner blade edge 866 relative to the outer blade edge 868 during operation, facilitating cutting. Thus, the ends 855 and 877 act as magnetic conduits (or electromagnets) that draw the inner blade 812 toward the outer blade 814.

[0082]

[0113] The current or voltage (or electricity or charge) supplied from the magnetic tension assembly 874 to the electromagnet 876 can be related to the operation of the cutter 800. Specifically, a load or speed sensor 888 is incorporated into the cutter 800 to detect increases and / or decreases in the load or speed on the motor 820. The changes in the load or speed of the motor 820 are proportional to the frictional load between the blades 812 and / or 814. The sensor 888 sends a signal to the electromagnet 876 indicative of the load and / or speed changes on the motor 820 to increase or decrease the magnetic force between the inner blades 812 and 814. The changes in the load on the motor 820 are indicative of and / or proportional to the frictional load between the blades 812 and 814 experienced during hair cutting. Similarly, changes in the speed of the motor 820, inner blade 812, and / or outer blade 814 are indicative of and / or proportional to the frictional load between the blades 812 and 814. As the detected load increases or speed decreases, the voltage and / or current supplied to the electromagnet 876 is increased to improve tension between the inner and outer cutters 812 and 814. For example, if the sensor 888 detects a changed load or speed on the motor 820, the sensor 888 sends a signal to the electromagnet 876 to increase the current in the magnetic tension assembly 874, increasing the magnetic attractive or pulling force between the guide member 880 and the inner and outer cutters 812 and 814, reducing the friction load and the load on the motor 720.

[0083]

[0114] In some embodiments, the electromagnet 876 is used in conjunction with other magnets 876 (e.g., 176, 276, 376, 476, 576, 676, and 776), such as those disclosed in conjunction with other embodiments of the magnetic tension assembly (e.g., 174, 274, 374, 474, 574, 674, and 774). Additionally, the electromagnet 876 (and / or magnets 176, 276, 376, 476, 576, 676, and 776) can be associated with at least one sensor 888 to facilitate selective engagement (or magnetization) of the electromagnet 876. For example, the electromagnet 876 is associated with a proximity sensor 888 configured to detect hair, a motion sensor 888 configured to detect movement of the clippers 800, and / or a sound sensor 888 configured to detect sound of clipper operation (or operation of the motor 820). In response to the associated detection by the sensor 888, the electromagnet 876 selectively engages the electromagnet 876 (e.g., sends a signal to increase or decrease the current to the electromagnet 876). Thus, the magnetic force between the inner blade 812 and the outer blade 814 is selectively variable. The selective application of the magnetic force reduces the friction load between the blades 812 and 814, the load on the motor 820, and the heat generated by the cutter 800, allowing the user to improve their experience during use. In other words, the sensor 888 communicates with the electromagnet 876 to enhance the overall performance and life cycle of the cutter 800.

[0084]

[0115] It is to be understood that the figures illustrate exemplary embodiments in detail, and it is to be understood that the application is not limited to the details and methodologies illustrated in the drawings or described in the description. It is also to be understood that the terminology is for the purpose of description only and should not be considered limiting.

[0085]

[0116] Further modified and alternative embodiments of various aspects of the invention will be apparent to those skilled in the art in view of this description. Accordingly, this description should be construed as merely illustrative. The construction and arrangements shown in the various exemplary embodiments are merely illustrative. While only a few embodiments have been described in detail in this disclosure, numerous modifications are possible without substantially departing from the novel teachings and advantages of the subject matter described herein (e.g., variations in the size, dimensions, structure, shape, and proportions of various elements, parameter values, mounting arrangements, materials, colors, orientations, etc.). Some elements shown as integrally formed may be comprised of multiple parts or elements, element positions may be reversed or otherwise changed, and the nature and number of separate elements or positions may be modified or changed. The sequence or order of any process, logic algorithm, or method steps may be changed or re-sequenced according to alternative embodiments. Other substitutions, modifications, variations, and omissions may also be made in the design, operating conditions, and arrangements of the various exemplary embodiments without departing from the scope of the present invention.

[0086]

[0117] For purposes of this disclosure, the term "coupled" means joining two components directly or indirectly to one another. Such joining may be static in nature or movable in nature. Such joining may be achieved using two members, with any additional intermediate members, integrally formed with one another as a single unit, or the two members, or the two members and any additional members, may be attached to one another. Such joining may be permanent in nature or, alternatively, removable or releasable in nature.

[0087]

[0118] Although this application describes particular combinations of features in the claims appended hereto, various embodiments of the present invention relate to, and any combination of, any of the features described herein may be claimed in this or a future application, whether or not such combination is currently claimed. Any feature, element, or component of any of the exemplary embodiments discussed above may be used alone or in combination with any feature, element, or component of any of the other embodiments discussed above.

[0088]

[0119] In various exemplary embodiments, relative dimensions, including angles, lengths, and radii, as shown in the figures are to scale. Actual measurements in the figures will disclose the relative dimensions, angles, and ratios of various exemplary embodiments. Various exemplary embodiments span a variety of ranges around the absolute and relative dimensions, angles, and ratios that may be determined from the figures. Various exemplary embodiments include any combination of one or more relative dimensions and / or angles that may be determined from the figures. Additionally, actual dimensions not expressly set forth in this description can be determined by using the ratios of the dimensions measured in the figures in combination with the express dimensions set forth in this description.

Claims

1. 1. A magnetic blade assembly comprising: a first blade having a plurality of teeth extending along a first cutting edge; a second blade having cutting teeth extending along a second cutting edge parallel to the first cutting edge, the cutting teeth being supported relative to the first blade for movement relative to the first blade to cut hair; A blade guide assembly, comprising: a guide member for maintaining a position of the first blade edge relative to the second blade edge, the guide member including a guide surface along which the second blade is configured to slide as the second blade moves relative to the first blade; a magnetic assembly including at least one magnet disposed on a surface of the second blade, the surface of the second blade extending from the second blade edge and facing away from the first blade; the magnetic assembly comprising: a blade guide assembly that generates tension between the first blade and the second blade.

2. The magnetic blade assembly of claim 1 , wherein the tension is an attractive force between the first blade and the second blade.

3. 3. The magnetic blade assembly of claim 2, wherein the at least one magnet generates an attractive force between the first blade and the second blade that orients and maintains the position of the second blade relative to the first blade.

4. The magnetic blade assembly of claim 1 , wherein the at least one magnet is a disk magnet.

5. 2. The magnetic blade assembly of claim 1, wherein a distance between the first blade edge and the second blade edge defines a blade gap, and a portion of the guide member engages a rear end of the second blade opposite the second blade edge to guide the second blade relative to the first blade and maintain the blade gap.

6. The magnetic blade assembly of claim 5 , wherein a portion of the guide member is an inclined surface.

7. The magnetic blade assembly of claim 5 , wherein the blade gap is adjusted by movement of a lever coupled to the blade guide assembly.

8. The magnetic blade assembly of claim 5 , wherein the at least one magnet is located between the second blade edge and a trailing end of the second blade.

9. The magnetic blade assembly of claim 1 , wherein the at least one magnet is a ferrous magnet.

10. 1. A magnetic blade assembly comprising: an outer cutter having a plurality of teeth extending along an outer cutter edge; an inner cutter having cutting teeth extending along an inner cutting edge parallel to the outer cutting edge, the inner cutter including a first side facing the outer cutting edge and a second side facing the first side, the second side being connected to and extending from the inner cutting edge; A blade guide assembly, comprising: a guide member configured to engage a portion of the inner cutting edge to maintain the position of the outer cutting edge relative to the inner cutting edge, the guide member having a guide surface along which the inner cutting edge slides as the inner cutting edge moves relative to the outer cutting edge; a magnetic assembly including at least one magnet disposed on a second side of the inner blade; The magnetic assembly includes a blade guide assembly that generates an adjustable tension between the outer blade and the inner blade.

11. 11. The magnetic blade assembly of claim 10, wherein the at least one magnet generates the adjustable tension, which is an attractive force between the outer blade and the inner blade that orients and maintains the position of the inner blade relative to the outer blade.

12. a metal member disposed on a first side of the inner cutter; The magnetic blade assembly of claim 10 , wherein the metallic member engages a magnetic force emitted by the at least one magnet.

13. The magnetic blade assembly of claim 12 , wherein the metallic member is constructed from a ferromagnetic material.

14. 13. The magnetic blade assembly of claim 12, wherein the metal member is magnetized with a polarity that is the same as a polarity of the at least one magnet such that the adjustable tension provides a repulsive force that orients and maintains the position of the inner blade relative to the outer blade.

15. A blade gap is defined as the distance between the outer cutting edge and the inner cutting edge; 11. The magnetic blade assembly of claim 10, wherein the guide surface of the guide member engages the inner blade at a location opposite the inner cutting edge to guide the inner blade relative to the outer blade and maintain a constant blade gap.

16. 1. A magnetic blade assembly comprising: an outer cutter having a plurality of teeth extending along the outer cutter; an inner cutter having cutting teeth extending along an inner cutting edge parallel to an outer cutting edge, the inner cutter being supported relative to the outer cutter so that the cutting teeth are movable relative to the outer cutter to cut hair, the inner cutter including a first side facing the outer cutter and a second side facing the first side and facing away from the outer cutter; a yoke coupled to the inner blade; A blade guide assembly, comprising: a guide member configured to engage a portion of the inner cutting edge to maintain the position of the outer cutting edge relative to the inner cutting edge; a magnetic assembly having a plurality of magnets disposed between the yoke and the second side of the inner blade; a blade guide assembly, wherein the magnetic assembly generates tension between the outer blade and the inner blade, the tension maintaining the relative position of the inner blade edge with respect to the outer blade edge as the inner blade moves relative to the outer blade to cut hair.

17. an inner portion of the guide member engages the inner cutter to translate the inner cutter relative to the outer cutter; The magnetic blade assembly of claim 16 , wherein translation of the inner blade adjusts a blade gap defined between the inner cutting edge and the outer cutting edge.

18. Further provided with an adjustment lever, 18. The magnetic blade assembly of claim 17, wherein rotation of the adjustment lever causes the guide member to translate relative to the outer blade in a direction transverse to the direction of translation of the inner blade.

19. The magnetic blade assembly of claim 16 , wherein the guide member includes a portion that is captured between the inner blade and the outer blade.

20. The magnetic blade assembly of claim 16 , wherein the yoke is constructed from a non-conductive material.

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