Toothbrush employing resiliently buckling arch to indicate exces

Details Toothbrush employing resiliently buckling arch to indicate exces Toothbrush employing resiliently buckling arch to indicate exces

1991-03-01

1992-09-15

Coe, Philip R.

Brushing, scrubbing, and general cleaning

Implements

Brush or broom

151431, A46B 502, A46B 904

Patent

active

051466457

ABSTRACT:
A toothbrush 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 handle and the toothbrush head which includes a scrubbing or polishing medium, typically bristles. The twin beam structure is itself comprised of a back side beam and a face side beam. During normal use, the back side beam is subjected to compressive stress whereas the face side beam is subjected to tensile stress. 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 gripping the handle and bringing the bristles or other cleansing or scrubbing medium in contact with the teeth and gums. When a predetermined force is exceeded, the back side beam resiliently buckles and inverts to a downwardly convex arch configuration. In a preferred embodiment, the back side and face side beams are nonparallel with a convergent taper from the brush handle in the direction of the brush head. The disclosed twin beam structures resist deflection up to a predetermined force which is determined primarily by their material properties and their precise geometric configuration. Attempting to exceed the predetermined force which the toothbrush is capable of transmitting by applying additional manual force to the brush handle results in resilient buckling of the back side beam in the twin beam structure, followed by substantial deflection of the brush head relative to the brush handle without a corresponding increase in the force applied to the teeth and gum tissue via the bristles on the brush head.

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Co-pending commonly assigned U.S. Patent Application of R. S. Dirksing, Ser. No. 662,852, filed Mar, 1, 1991, entitled "Toothbrush Having Handle Joined To Brush Head by Non-Pinching Flexible Twin Beam Structure" (copy not included).
Co-pending commonly assigned U.S. Patent Application of R. Kirberger, Ser. No. 446,962 filed Dec. 6, 1989 entitled "Toothbrush" (copy not included).
Co-pending commonly assigned U.S. Patent Application of R. Kirberger, Ser. No. 429,741 filed Oct. 31, 1989 entitled "Toothbrush" (copy not included).
Co-pending commonly assigned U.S. Patent Application of K. Bartsch, Ser. No. 440,822 filed on Nov. 22, 1989 entitled "Toothbrush With A Deflecting Part Having A Deflection Profile" (copy not included).

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