Patent Application
20090056139
This invention relates to hand-held personal care appliances and in particular to such appliances equipped with rechargeable batteries.
Various forms of hand-held personal care appliances with electrical devices powered from a rechargeable battery are known. When the battery charge is exhausted it is necessary to recharge the battery to enable further use of the appliance and different charging arrangements are also known. Some appliances are equipped with an electric socket into which a plug which is attached to a charging device by an electric cable, can be inserted. The electric socket is often located on a handle of the appliance. Charging devices are commonly powered from a mains supply, although only a low recharging voltage is connected to the appliance. With such an arrangement an appliance can be used while the battery is being recharged. From a safety point of view it is in some circumstances at least preferable that a battery-operated hand-held appliance can not be used when it is connected to equipment that is itself connected to a mains supply. Inductive charging devices are also in common use, in which case the appliance and the charging unit include induction coils so that charging can be carried out without need for a direct electrical connection between them. With an inductive charging arrangement an appliance can be completely sealed against water ingress, and can not be used whilst the battery is being recharged. However, the charging rate is generally slow and an induction coil can not be housed within a metal casing, such as a metal handle, which might be desirable from other design considerations. There is, therefore a need for an arrangement that allows the battery of a hand-held personal care appliance to be charged at high rate through a metal handle and which will ensure the appliance is not electrically connected to any equipment that may itself be connected to the mains supply, when the appliance is being used.
The present invention sets out to satisfy the need identified alone and in accordance with the invention there is provided a hand-held personal care appliance comprising: a handle including electrical contacts and accommodating a rechargeable power supply for supplying electric current to the electrical contacts; an operating head releasably engageable with the handle and including an electrical device to be operated by electric current supplied from the power supply, the operating head having electrical contacts for cooperation with the electrical contacts of the handle when the operating head is engaged with the handle; and a charging device for recharging the power supply, the charging device having electrical contacts engageable with the electrical contacts of the handle to deliver recharging current to the power supply.
In an appliance embodying the invention the electrical contacts on the handle employed for delivery of a charging current from the charging device to recharge the power supply are the same contacts as those which supply electric current to the operating head when the appliance is in use. As a consequence the operating head has to be disengaged from the handle before the handle can be connected to the charging device for recharging the power supply. Therefore, the appliance can not be used while the power supply is being recharged. In addition of a fast charging rate is possible because there is a direct electrical connection between the handle and the charging device, and there are no restrictions imposed on the material of the handle.
In a preferred construction the handle and the charging device have complementary coupling members, for example, complementary male and female coupling members of a bayonet coupling, for mechanically and electrically connecting the handle to the charging device for recharging the power supply. In a particular embodiment the female coupling member is provided at an end of the handle and includes a cylindrical sleeve portion with a bayonet slot therein, and a male member provided on the charging device includes a plug part that is engageable in the sleeve and has a projection for engagement with the bayonet slot.
A sealing arrangement can be provided for sealing the handle to the charging device externally of the electrical contacts. In particular the handle can be provided with an annular seal extending around the sleeve portion axially inwardly of the bayonet slot for cooperation with a cylindrical part surrounding the plug part on the charging device.
Conveniently the handle includes a switch arrangement for controlling the supply of electric current to the operating head in use of the appliance and/or for controlling supply of electric current to the power supply during recharging.
Various forms of operating head are possible. In one embodiment the operating head is a safety razor head and the electrical device is an electrically powered vibration generating device. Another operating head comprises a hair trimmer unit with a trimmer blade assembly, the electrical device comprising an electric motor for driving a blade of the blade assembly.
A full understanding of the invention will be gained from the detailed description which follows and in which reference is made to the accompanying drawings.
a, 4b, and 4c are front elevations showing respective appliances assembled from the components of the apparatus illustrated in
A personal care apparatus, in particular a personal grooming apparatus is illustrated in
The bayonet coupling provides a firm and secure mechanical connection between the handle and the hair trimming device while also ensuring a good electrical connection between them. Furthermore, the coupling can be easily opened to separate the trimming device from the handle, to enable the battery to be recharged and to allow a different form of operating head to be operatively connected to the handle, such as a safety razor head 4 which is adapted to receive a conventional shaving cartridge 56 and which includes a motor for driving a vibration generating device, such as a coin motor. As will be appreciated the coupling employed to connect the safety razor head 4 to the handle 2 may be exactly as described above with respect to the trimming device 3, with the shroud 25 being sealed to the handle so that water can not reach the electrical contacts even when the razor head is completely immersed in water for rinsing the shaving cartridge.
The trimming device includes a drive unit 30 and a trimmer unit 31. The male coupling member 16 and the shroud 26 are provided on a housing 32 of the drive unit in which is housed an electric rotary motor 33 and a transmission mechanism 34 for converting rotary motion of a motor shaft 35 into reciprocation of a drive output member 36 in the form of a drive pin. The electric terminals of the motor are connected to the electrical contacts 21 and 23 of the trimming device for supply of current from the battery 13 in the handle for driving the motor. Connected to the front of the drive unit is a mounting plate 40 for the trimmer unit 31, the mounting plate being guided for up and down translatory movement relative to the drive unit for purposes which will become clear. The trimmer unit is held to the mounting plate 40 so that the trimmer unit 31 is able to rotate relative to the mounting plate 40 and hence also the drive unit 30. The trimmer unit includes a first trimmer blade assembly 42 and a second trimmer blade assembly 43. The first blade assembly 42 is comparatively long and straight and includes a first trimmer blade 44 fixedly mounted to a face plate 45 of the trimmer unit, and a second trimmer blade 46 guided for reciprocation relative to the first trimmer blade and attached to a blade driving element 47. The second blade assembly 43 is relatively short with a convex profile and includes a first trimmer blade 48 fixedly mounted to the face plate 45 and a second trimmer blade 49 guided for reciprocation along a curved path relative to the first trimmer blade 48 and attached to a blade driving element 50 which is mounted to the face plate 45 by a pivot 51. Each of the blade driving elements 47, 50 includes a slot in which the drive output pin 36 is engageable for reciprocating the blade driving element and also reciprocating the trimmer blade attached to the blade driving element.
When the mounting plate 40 is displaced upwardly relative to the drive unit the trimmer unit 31 can be rotated relative to the mounting plate to selectively adjust either the first blade assembly 42 or the second blade assembly 43 to the operative position, as respectively illustrated in
Although just two forms of operating head have been described it will be appreciated that other additional or alternative forms of operating head mountable on the handle 2 are possible, such as to provide a nose hair trimmer, an exfoliator, an eyebrow trimmer, a skin cream applicator, liquid dispenser, and/or a massager. It is also within the scope of the invention for there to be just one operating head.
The battery recharger base 1 provides a useful storage unit for the components, but most importantly acts as a recharging station for the battery accommodated in the handle 2. In addition to the necessary electrical recharging circuitry as known per se and not illustrated in the drawings, the recharging device is equipped with the socket 6 for the handle to plug into as illustrated in
When the battery 13 has been sufficiently recharged the handle 2 can be unplugged from the recharging base 1 and a selected operating head 3, 4 can be engaged onto the handle for use of the appliance. However, use of an appliance while the battery is in the process of being recharged is precluded. Since there is a direct electrical connection between the handle and the recharging device a fast charging rate can be assured. Furthermore, the handle can be manufactured with a metal casing and the cast of additional connections for recharging purposes is avoided by use of the contacts that deliver electric current from the handle to the operating head also for connecting the handle to the recharging device.
The dimensions and values disclosed herein are not to be understood as being strictly limited to the exact numerical values recited. Instead, unless otherwise specified, each such dimension is intended to mean both the recited value and a functionally equivalent range surrounding that value. For example, a dimension disclosed as “40 mm” is intended to mean “about 40 mm”.
All documents cited in the Detailed Description of the Invention are, in relevant part, incorporated herein by reference; the citation of any document is not be construed as an admission that it is prior art with respect to the present invention. To the extent that any meaning or definition of a term in this written document conflicts with any meaning of definition of the term in a document incorporated by reference, the meaning or definition assigned to the term in this written document shall govern.
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the invention. It is therefore intended to cover in the appended claims all such changes and modifications that are within the scope of this invention.
