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VIBRATION-FREE VIBRATORY SHAVING HEAD

IP.com Disclosure Number: IPCOM000244770D
Publication Date: 2016-Jan-12
Document File: 2 page(s) / 338K

Publishing Venue

The IP.com Prior Art Database

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2015ID00456

Background

An electric foil shaver is generally constructed from a curved thin foil and a set of cutting blades that are moved reciprocally underneath to cut the hairs that protrude through the holes in the foil.

FOIL

CUTTER ASSEMBLY

The reciprocating motion of the cutter assembly causes significant vibrations in the shaver. Which are, at least partly, transmitted to the hand holding and handling the shaver. With the increase in effective power inputted to the cutter assembly and the increasing frequencies in modern foil shavers, these vibrations are becoming a detractor to the experience of shaving with such modern foil shavers.

Solution

The current concept cancels out the vibrations closest to the location where these occur. The cutter assembly itself is split in two separate sections that have a reciprocating motion which is synchronized and opposite in direction with the momentum vector of both sections on the same axis. This is somewhat similar to the principle underlying the 'Gegenkolben' class of vibration-free combustion engines notably developed and manufactured by Junkers.

FOIL

CUTTER ASSEMBLY SECTION

To do this both sections of the cutter are arranged to share the force vector of their momentum. As a mass oscillates, there is a line over which it moves in Cartesian space. The vibratory force that is experienced is also on that line, the vector of the momentum. Both sections have such a vector, these need to be aligned. The net momentum of both sections is summed to zero. With identical masses and motions over time, this can be done by inverting the motion direction of one section (opposite direction). With differences in motion, this can be done by adjusting the amplitude...