A - Human Necessities – 46 – B
Patent
A - Human Necessities
46
B
A46B 5/00 (2006.01) A46B 17/08 (2006.01)
Patent
CA 2104448
A toothbrush (1) employing a force indicator which visually and tactually signals the user that a predetermined brushing force has been exceeded. The force indicator is comprised of a resilient twin beam structure located between the toothbrush han- dle (2) and the toothbrush head (5) which includes a scrubbing or polishing medium, typically bristles (13). The twin beam struc- ture is itself comprised of a back side beam (15) and a face side beam (14). During normal use, the back side beam (15) is subject- ed to compressive stress whereas the face side beam is subjected to tensile stress (14). The at rest configuration of the back side beam permits it to behave as an upwardly convex arch upon initial application of compressive force resulting from a user grip- ping the handle (2) and bringing the bristles (13) or other cleansing or scrubbing medium in contact with the teeth and gums. When a predetermined force is exceeded, the back side beam (15) resiliently buckles and inverts to a downwardly convex arch configuration. In a preferred embodiment, the general planes of the back side (15) and face side beams (14) are nonparallel with a convergent taper from the brush handle (2) in the direction of the brush head (5). The disclosed twin beam structures resist def- lection up to a predetermined force which is determined primarily by their material properties and their precise geometric confi- guration. Attempting to exceed the predetermined force which the toothbrush (1) is capable of transmitting by applying additional manual force to the brush handle (2) results in resilient buckling of the back side beam (15) in the twin beam structure, followed by substantial deflection of the brush head (5) relative to the brush handle (2) without a corresponding increase in the force appli- ed to the teeth and gum tissue via the bristles (13) on the brush head (5).
Gowling Lafleur Henderson Llp
The Procter & Gamble Company
LandOfFree
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