Surgery – Instruments – Means for removal of skin or material therefrom
Patent
1992-04-02
1993-10-19
Pellegrino, Stephen C.
Surgery
Instruments
Means for removal of skin or material therefrom
606131, A45D 2600
Patent
active
052541240
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an epilation head for motor-powered epilating appliances, comprising a hollow cylinder which is at least in part enclosed by the appliance casing and whose working surface to be placed in contact with the skin is defined by its end surface, with a gripping device mounted in the hollow cylinder and comprised of at least two diametrically opposed spring-loaded gripping members adapted to be urged into gripping engagement with the inner surface of the hollow cylinder and being operatively associated with a control element disposed equiaxially with the cylinder axis, with a transmission link being provided between the drive motor and the hollow cylinder and/or the control element.
An epilating appliance of the aforementioned type is described in German patent application No. DE 39 22 949. In the epilation head structure described therein in several variants, the gripping members are mounted on the free ends of leaf springs having their other ends attached to the inner surface of the hollow cylinder. The control element which effects the opening or closing movement of the gripping members is configured as a cam acting below the gripping members directly on the leaf springs.
These provisions of the invention assure a precise sequence of motion of the gripping members. Because of the possibility of varying the lever ratios, the energy balance can be favorably affected with regard to the forces to be generated for opening or closing the gripping members and the maintaining of the gripping force in the closed position, as well as with regard to the forces of friction and mass inertia.
The axle arrangement is especially advantageous if it is considered important to have a largely free choice regarding the lever lengths in the direction of the geometrical axis of the cylinder.
A particular axle arrangement affords the advantage of accomplishing a nearly uniform opening space as the gripping members open or, where necessary, an opening space enlarged in the form of a wedge by displacement of the fulcrum of the gripping members, thus facilitating the guiding of the hairs into the gripping space. In addition, it enables the length of the epilation head to be reduced appreciably in the direction of the cylinder axis.
When the gripping members are normally urged into their closed position, the opening movement occurring by the control element in opposition to the spring force. Accordingly, only this action requires energy to be expended. In particular the opening movement can be accelerated by suitably forming the control element (cam or cam disk).
A particular operating mechanism for the gripping members combines the advantages of a particularly straightforward construction with quiet running and energy savings. Conversely to the embodiments previously referred to, the supply of energy for operation of the gripping members in an appreciable amount is only necessary in the range of closed gripping members, while the functions "Open--Keep Open--Close" require forces of friction and mass inertia to be overcome which, however, can be maintained at a low level by technical means known in the art.
Another advantageous embodiment of an epilation head has a mechanism for movement of the gripping members which incorporates essential advantages of the variants previously described, including: Full closing force over the entire range of the closing angle of the control element at low levels of energy consumption. Energy for operation of the gripping members is needed only for the duration of the closing action, that is, the plucking action. It is proportional to the actual gripping force which, in turn, is directly dependent on the force of the spring in the gripping member-and-lever assembly and can be easily held within close limits. The additional spring travel made possible due to the restricted relative movability of the two components is only needed to compensate for manufacturing tolerances, being irrelevant in respect of a force increase.
Embodiments of the present invention are illustrated in the
REFERENCES:
patent: 4575902 (1986-03-01), Alazet
patent: 5057116 (1991-10-01), Zucker
patent: 5084046 (1992-01-01), Isack
patent: 5112342 (1992-05-01), Foerster
patent: 5116348 (1992-05-01), Gorter
Braun Gebhard
Heintke Hans-Eberhard
Schafer Walter
Braun Aktiengesellschaft
Dawson Glenn K.
Pellegrino Stephen C.
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