Toothbrush

• US 4,033,008 A
• Filed: 04/05/1976
• Issued: 07/05/1977
• Est. Priority Date: 04/05/1976
• Status: Expired due to Term

• Current Assignee: Colgate-Palmolive Company
• Original Assignee: Colgate-Palmolive Company
• Inventors: Rustogi, Kedar N., Volpe, Anthony R., Warren, William C.
• Primary Examiner(s): Feldman, Peter
• Application Number:
  US05/673,769
• Time in Patent Office: 456 Days
• Field of Search: 15/167 R, 15/167 A, 15/110, 15/106, 15/172, 15/176, 132/84
• US Class Current: 15/167.1
• CPC Class Codes: A46B 2200/1066 Toothbrush for cleaning the teeth or dentures A61C17/16 takes precedence; bristles arrangements for toothbrushes A46B9/04
• CPC Class Codes: A46B 9/04 Arranged like in or for toothbrushes

Abstract

A toothbrush head has two inner longitudinal rows of relatively soft bristle tufts, two outer longitudinal rows of shorter relatively hard bristle tufts, and a transverse end row of hard bristle tufts that are longer than any of the other tufts, and the end surfaces of the bristle tufts of the inner and outer rows are tapered laterally outwardly from an apex of the softer bristles that extends longitudinally medially of the head.

Claims

1. A toothbrush comprising a handle terminating at one end in a head and at least two distinct groups of bristle tufts projecting from the head, one of said groups comprising a plurality of rows of relatively soft bristle tufts extending longitudinally of the head and the other of said groups comprising rows of relatively hard bristle tufts extending longitudinally of the head alongside and laterally outwardly and on opposite sides of said one group, the tufts of said one group being longer and of smaller diameter bristles than the tufts of said other group, and a transverse row of bristle tufts on the end of the head remote from the handle and comprising bristle tufts that are longer than any of the other bristle tufts on the head the bristle tufts of said end row being harder and of larger diameter than the bristle tufts of said one group.

2. The toothbrush defined in claim 1, wherein the inner group consists of two longitudinal rows of bristle tufts, and the outer group consists of longitudinal rows of bristle tufts extending along opposite sides of the inner group.

3. The toothbrush defined in claim 2, wherein said rows are parallel and of the same number of equally spaced tufts.

4. The toothbrush defined in claim 1, wherein the free ends of a bristle in said remote end row lie in a plane above the other bristle end surfaces and substantially parallel to the head.

5. The toothbrush defined in claim 1, wherein the bristles of the inner group are fibers of nylon or the like about 0.007 inches in diameter, and the bristles of the outer group are fibers of nylon or the like about 0.009 inches in diameter.

6. The toothbrush defined in claim 1, wherein the free end surfaces of said groups lie in oppositely inclined intersecting planes defining an apex of softer bristles extending substantially medially longitudinally of the head.

7. The toothbrush defined in claim 1, wherein the free end surfaces of the bristle tufts of said groups are each tapered at an angle of about 45°

.

9. The toothbrush defined in claim 1, wherein the bristles in said transverse end row are of about the same diameter as the bristles in the outer of said groups.

8. A toothbrush comprising a relatively flat head, two longitudinal side by side inner rows of bristles tufts projecting from said head, two outer longitudinal rows of bristle tufts projecting from said head at opposite sides of said inner rows, the tufts of said inner rows being longer than those of the outer rows, a transverse end row of bristle tufts bridging two adjacent ends of said outer rows and comprising tufts that are longer than any of the other tufts on the head, the bristles of said outer rows and the transverse end rows being harder than those of the inner rows whereby said outer and end rows effectively confine an area of softer bristles, and the free surfaces of all the tufts of said inner and outer rows being tapered laterally outwardly and toward the plane of the head to define a longitudinally extending apex of longer softer bristles.