The invention relates to a shaving unit comprising a housing and at least one cutting unit accommodated by the housing. Each cutting unit comprises an external cutting member and an internal cutting member which is rotatable relative to the external cutting member about an axis of rotation. A locking system is configured and arranged to prevent rotation of the external cutting member relative to the housing. Said locking system 5 comprises an annular array of N1 first arresting elements and N2 second arresting elements, wherein N1≥8 and 1≤N2≤N1. The N2 second arresting elements are configured and arranged to be each engageable with a respective one of the N1 first arresting elements in any of N1 angular positions of the external cutting member about the axis of rotation relative to the housing.

A rotary electric shaver includes a head connected to a blade setting base of a main body. The blade setting base has a setting part in which a plurality of blade units are disposed, and a blade frame that holds the setting part. An inner blade part of the blade unit has an inner blade member, and a base part joined to the inner blade member. An outer blade part of the blade unit has an annular outer blade member having a sliding contact surface and a plurality of slits formed in the circumferential direction, a disk-shaped cover, a ball, and a support. A part of the ball surrounded by the cover and the support protrudes from the cover.

A rotary electric shaver includes a main body in which a first transmission mechanism, and a connecting portion is disposed; a head unit in which a plurality of blade units each having an outer blade, an inner blade being in sliding contact with an inner surface of the outer blade, and a driven shaft rotating the inner blade are disposed, and a second transmission mechanism that transmits a driving power of the first transmission mechanism to rotate the driven shaft is built, and which is connected to the connecting portion; and a drive shaft for transmitting the driving power of the first transmission mechanism to the second transmission mechanism, wherein a first endless belt is disposed in the first transmission mechanism and a second endless belt is disposed in the second transmission mechanism.

The invention relates to a coupling structure (8, 9, 10) for coupling a drive shaft (6) of a main body (2) of a hand-held appliance (1) to a driven part (7) of a releasable functional attachment (3) of the hand-held appliance (1). The coupling structure comprises a coupling bush (8), a coupling head (9) and a coupling spring (10). The coupling head (9) is axially fixed within the functional attachment (3), the coupling bush (8) is axially displaceable within the main body (2). The coupling spring (10) is housed in the main body (2) and urges displacement of the coupling bush (8) towards the coupling head (9), when the functional attachment (3) is attached to the main body (2). The coupling structure is compact, especially in the axial direction of the coupling structure, and especially within the functional attachment.

A hair cutting appliance comprises an external cutting member and an internal cutting member arranged rotatable to the external cutting member for cutting hair. The internal cutting member is driven via a first coupling element by a drive spindle (24) rotatable about an axis of rotation (35) and having a first spindle part (26) arranged to be driven by a drive, and a second spindle part (30) arranged to be coupled to the internal cutting member, the first and second spindle parts (26, 30) being displaceable relative to each other in an axial direction parallel to the axis of rotation (35); wherein the second spindle part (30) comprises a second coupling element (34) which is coupled to the first coupling element for transmitting, during operation, a driving torque about the axis of rotation (35) from the drive spindle (24, 24a) to the internal cutting member; wherein one of the first and second spindle parts (26, 30) comprises an abutment element (36) and the other of the first and second spindle parts (26, 30) comprises an abutment surface (38) arranged to cooperate with the abutment element (36) for transmitting, during operation, the driving torque from the first spindle part (26) to the second spindle part (30); wherein the abutment surface (38) is arranged at an angle α relative to a tangential direction relative to the axis of rotation (35), wherein 0°<α<90° such that a transmission of the driving torque from the first spindle part (26) to the second spindle part (30) via the abutment element (36) and the abutment surface (38) results in a force exerted by the first spindle part (26) on the second spindle part (28) having a component parallel to the axis of rotation (35) and directed towards the internal cutting member, wherein the first and second coupling elements are configured to transmit the component from the second spindle part (30) to the second coupling element (34).

There is provided a method of providing feedback regarding motion of a rotary shaver performed by a user, the method comprising the steps of receiving, during at least one time interval, at least one motion type determined for the motion of the rotary shaver performed by the user, wherein the motion type is selected from a set of predefined motion types that comprises small rotational motion and one or more other predefined motion types; determining a degree of occurrence in the time interval of each of the motion types in the set of time interval; determining from the determined degree of occurrence of each of the motion types in the set of predefined motion types which motion type has a highest degree of occurrence in the time interval; and providing feedback to the user to increase a degree of occurrence of small rotational motion of the rotary shaver if the determined motion type having the highest degree of occurrence is one of the other predefined motion types.

The invention relates to a shaving unit for a shaving apparatus The apparatus including at least a first cutting unit and a second cutting unit, where each of the first and second cutting units respectively include external cutting members having a plurality of hair entry openings and further respectively include internal cutting members which are rotatable relative the respective external cutting members about respective axes of rotation. The first and second internal cutting members being connected to a transmission unit via, respective first and second drive spindles. Each of the first and second cutting units including a housing having a bottom wall including an opening in fluid communication with a hair collection chamber in the housing. In each cutting unit opposed sealing surfaces are provided between the opening and the hair collection chamber, arranged to prevent cut hairs from escaping from the hair collection chamber via the opening and to allow water to flush via the opening to the hair collection chamber.

A hair cutting appliance comprises an external cutting member and an internal cutting member arranged rotatable to the external cutting member for cutting hair. The internal cutting member is driven via a first coupling element by a drive spindle (24) rotatable about an axis of rotation (35) and having a first spindle part (26) arranged to be driven by a drive, and a second spindle part (30) arranged to be coupled to the internal cutting member, the first and second spindle parts (26, 30) being displaceable relative to each other in an axial direction parallel to the axis of rotation (35); wherein the second spindle part (30) comprises a second coupling element (34) which is coupled to the first coupling element for transmitting, during operation, a driving torque about the axis of rotation (35) from the drive spindle (24, 24a) to the internal cutting member; wherein one of the first and second spindle parts (26, 30) comprises an abutment element (36) and the other of the first and second spindle parts (26, 30) comprises an abutment surface (38) arranged to cooperate with the abutment element (36) for transmitting, during operation, the driving torque from the first spindle part (26) to the second spindle part (30); wherein the abutment surface (38) is arranged at an angle α relative to a tangential direction relative to the axis of rotation (35), wherein 0°<α<90° such that a transmission of the driving torque from the first spindle part (26) to the second spindle part (30) via the abutment element (36) and the abutment surface (38) results in a force exerted by the first spindle part (26) on the second spindle part (28) having a component parallel to the axis of rotation (35) and directed towards the internal cutting member, wherein the first and second coupling elements are configured to transmit the component from the second spindle part (30) to the second coupling element (34).

There is provided a rotary electric shaver which can easily prevent an outer blade which is undesirable to be brought into contact with a skin from coming into contact with the skin, by reducing the number of contact times of the outer blades in a head with the skin, even when the shaver is used in a state where the head is substantially parallel to the skin. A rotary electric shaver includes a main body having a drive shaft, and a head connected to the main body. At least one of a plurality of blade units has a fulcrum plate, a turning plate, a spring, and a fixing plate, and has a lock mechanism capable of changing a height position of at least one of outer blades corresponding one-to-one to the blade units.

The invention relates to a hair-cutting unit for a shaving device. The hair-cutting unit comprises a hair-cutting element and a telescopic drive-shaft mechanism (3). The drive-shaft mechanism comprises a first shaft-segment (21), which is in telescopic engagement with a co-rotating second shaft-segment (22), which is in telescopic engagement with a co-rotating third shaft-segment (23). A spring mechanism presses the first 5 telescopic shaft-segment and the third telescopic shaft-segment away from one another. In an embodiment, the first and second telescopic shaft-segments (21, 22) are in mutual tillable engagement and/or the second and third telescopic shaft-segments (22, 23) are in mutual tillable engagement. The invention provides improved skin-contour-following capacity of a shaving device, while at the same time the required installation space for the drive-shaft 10 mechanism remains restricted.