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Publication numberUS1932878 A
Publication typeGrant
Publication dateOct 31, 1933
Filing dateAug 27, 1932
Priority dateSep 5, 1931
Publication numberUS 1932878 A, US 1932878A, US-A-1932878, US1932878 A, US1932878A
InventorsKuniyoshi Akizawa
Original AssigneeKuniyoshi Akizawa
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Toothbrush
US 1932878 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

Oct. si, 1933. AKIZAWA 1,932,878

TOOTHBRUSH Filed Aug. 27, 1952 I'nre 77 fan- Patented Oct. 31, 1933 UNITED STATES PATENT OFFICE Application August 27, 1932, Serial No. 630,734, and in Japan September 5, 1931 1 Claim.

This invention relates to improvements in a tooth brush which comprises a shank and a detachable bristle back member. It has for its object to provide a rigid and reliable holding means for the bristle back member, which is rotatably held on a knob on the shank so that it rotates while it is in use, and the bristles are evenly wom all over the surtace.

Fig. 1 is a side elevation of the brush accordr ing to this invention, and

thereof.

Fig. 3 is a part sectional elevation of the shank. Fig. 4 is a sectional elevation of the bristle back member, and Fig. 5 is a plan view thereof.

The tooth brush of this invention consists of a shank and a bristle back member which is detachably held by the shank, the holding means being the characteristic feature of this invention.

Rererring to the drawing, an end of the shank 1 is somewhat flattened and widened so as to make a spoon-like shape. At the centre of the flattened end is fixed a knob 2 which may be made integral with the shank, or separately therei'rom and flrmly fixed thereto with a ce- 5 menting material. According to the example shown in Fig. 3, the knob 2 is made of a metal having a grooved flange za, the latter part being moulded in the body of the shank.

The bristle baekmember has a base plate 3 with bristle 4 set therein. On the back side of the plate is moulded therein in a spring member, which comprises a spring 5 and a case 6 therefor. The case has a central projection sa, and each end of the spring 5 fits into the slits 6b 5 on the opposite side of the central projection. The size of the central projection is such that the knob of the bristle back member can be loosely inscrted into the cavity of the projection.

Fig. 2 is a plan view When the knob fits into the cavity, the spring's ends flrmly hold the neck of the knob so that the bristle back member is connected to the shank although the former can freely rotate on the latter.

The shank and the base plate of the bristle back member can be made of any convenient material, but a plastic material such as celluloid and resinous compounds is preferable, because the knob and the spring member can be moulded in the bodies of the shank and the base plate without requiring any cementing material.

The tips of the bristles are cut so as to make a concentric wave form as shown in Fig. 2, thereiore the sectinal view of the bristle on any radial plane is the same as shown in Fig. 4.

When this tooth brush is in use, the bristle member rotates on the knob 2 by the triction on the teeth, so that each part of the bristle wears in the same manner and at the same speed, therefore a bristle member lasts longer. In case the bristle is wo-n off, it may be replaced by a new one, and the shank can be used for a long time.

What I claim is:-

A tooth brush which comprises a shank and a bristle back member detachably held by the former, the holding means consisting of a knob provided at an end of the shank and a spring member provided at the centre of the base plate of the bristle back member which base plate is made in a circular disc form. the knob being rotatably held by the spring member. and the tips of the bristles of the bristle back member being cut in concentric wave form.

KUNIYOBHI AKIZAWA.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2675573 *Oct 7, 1949Apr 20, 1954Harry A GoldbergToothbrush with removable head
US2959800 *Jul 2, 1958Nov 15, 1960Bischoff Edward SSnap-on brush
US2988764 *Feb 24, 1960Jun 20, 1961Light Steel Sectional Const LtHand utensils such as brushes or the like
US3008165 *May 1, 1959Nov 14, 1961Leidy G SchollRemovable brush shank
US3964120 *Oct 4, 1974Jun 22, 1976Lawrence Peska Associates, Inc.Comb cleaner
US4805870 *Mar 25, 1985Feb 21, 1989Emerson Electric Co.Coil retainer for solenoid
US5142724 *Feb 17, 1990Sep 1, 1992Park Sa RRotary toothbrush
US7805796Sep 8, 2004Oct 5, 2010Braun GmbhManual toothbrush
US8245348Jun 25, 2010Aug 21, 2012Braun GmbhManual toothbrush
US8448287Jul 14, 2011May 28, 2013Mcneil-Ppc, Inc.Replaceable toothbrush head
US20070169295 *Sep 8, 2004Jul 26, 2007Braun GmbhManual toothbrush
US20100257684 *Jun 25, 2010Oct 14, 2010Florina WinterManual toothbrush
EP0045356A1 *May 26, 1981Feb 10, 1982KARL PFISTERER ELEKTROTECHNISCHE SPEZIALARTIKEL GMBH & CO. KGHead for an operating rod
WO1992019125A1 *May 6, 1992Nov 12, 1992Geyter Pierre DeToothbrush and bristle holder therefor
WO2005063079A1 *Sep 8, 2004Jul 14, 2005Braun GmbhManual toothbrush
Classifications
U.S. Classification15/176.4, 315/209.00R, 403/326, 15/27
International ClassificationA46B7/04, A46B7/08, A46B7/00
Cooperative ClassificationA46B7/04, A46B7/08
European ClassificationA46B7/04, A46B7/08