|Publication number||US1932878 A|
|Publication date||Oct 31, 1933|
|Filing date||Aug 27, 1932|
|Priority date||Sep 5, 1931|
|Publication number||US 1932878 A, US 1932878A, US-A-1932878, US1932878 A, US1932878A|
|Original Assignee||Kuniyoshi Akizawa|
|Export Citation||BiBTeX, EndNote, RefMan|
|Referenced by (15), Classifications (11)|
|External Links: USPTO, USPTO Assignment, Espacenet|
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
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.
|Citing Patent||Filing date||Publication date||Applicant||Title|
|US2675573 *||Oct 7, 1949||Apr 20, 1954||Harry A Goldberg||Toothbrush with removable head|
|US2959800 *||Jul 2, 1958||Nov 15, 1960||Bischoff Edward S||Snap-on brush|
|US2988764 *||Feb 24, 1960||Jun 20, 1961||Light Steel Sectional Const Lt||Hand utensils such as brushes or the like|
|US3008165 *||May 1, 1959||Nov 14, 1961||Leidy G Scholl||Removable brush shank|
|US3964120 *||Oct 4, 1974||Jun 22, 1976||Lawrence Peska Associates, Inc.||Comb cleaner|
|US4805870 *||Mar 25, 1985||Feb 21, 1989||Emerson Electric Co.||Coil retainer for solenoid|
|US5142724 *||Feb 17, 1990||Sep 1, 1992||Park Sa R||Rotary toothbrush|
|US7805796||Sep 8, 2004||Oct 5, 2010||Braun Gmbh||Manual toothbrush|
|US8245348||Jun 25, 2010||Aug 21, 2012||Braun Gmbh||Manual toothbrush|
|US8448287||Jul 14, 2011||May 28, 2013||Mcneil-Ppc, Inc.||Replaceable toothbrush head|
|US20070169295 *||Sep 8, 2004||Jul 26, 2007||Braun Gmbh||Manual toothbrush|
|US20100257684 *||Jun 25, 2010||Oct 14, 2010||Florina Winter||Manual toothbrush|
|EP0045356A1 *||May 26, 1981||Feb 10, 1982||KARL PFISTERER ELEKTROTECHNISCHE SPEZIALARTIKEL GMBH & CO. KG||Head for an operating rod|
|WO1992019125A1 *||May 6, 1992||Nov 12, 1992||Geyter Pierre De||Toothbrush and bristle holder therefor|
|WO2005063079A1 *||Sep 8, 2004||Jul 14, 2005||Braun Gmbh||Manual toothbrush|
|U.S. Classification||15/176.4, 315/209.00R, 403/326, 15/27|
|International Classification||A46B7/04, A46B7/08, A46B7/00|
|Cooperative Classification||A46B7/04, A46B7/08|
|European Classification||A46B7/04, A46B7/08|