This invention relates to toothbrushes and more particularly to inexpensive battery-powered power toothbrushes.
Powered toothbrushes are becoming an increasingly desirable item for both adults and children. A variety of inexpensive semi-disposable and fully disposable powered toothbrushes are now available on the market. In order to interest children in developing good oral hygiene habits, many toothbrushes, including powered toothbrushes, are provided with decoration relevant to childrens' tastes. One of the more elaborate and desired forms of decoration is a sculpted feature applied to a portion of the brush handle. Such sculpted features can represent well-known cartoon characters or any other relevant three-dimensional subject matter including desirable toys.
Some important considerations in any disposable or semi-disposable power toothbrush design include appearance, reliability, and ease of manufacture. Thus, some designs may be easy to manufacture, but unreliable, and vice versa. The possibility of adding more-complex features, such as multiple moving brush heads is desirable, but may reduce cost ore reliability. A cost-effective design, with complex function (e.g. reciprocating motion, multiple heads, etc.), aesthetic appeal, reliability and ease of manufacture is an object of this invention.
This invention overcomes the disadvantages of the prior art by providing a power toothbrush with a drive train that is easy to manufacture, reliable in service and that enables multiple heads or other complex design or functional elements. In an illustrative embodiment, the power toothbrush includes a sealed case that encloses a motor with a pinion gear joined to a circular rack that drives an eccentric link that converts unidirectional rack rotation into bi-directional reciprocating linear motion. In one embodiment, the eccentric link is an eccentric pin mounted on the rack that rides in a slot on a drive plate. The plate is joined to a push rod, typically constructed of metal that passes up a hollow toothbrush shaft through an elastomeric seal to a head assembly. The head assembly includes one or more moving disks that are each connected to generally circular brush heads, which project outwardly from the head assembly. One disk receives a bent end of the drive shaft in a hole located eccentrically to the axis of rotation. When the circular rack rotates in a single direction, it drives the shaft in a reciprocating motion that, thereby, rotates the disk in a corresponding reciprocating circular motion about its axis. Additional disks can be linked by a short connecting link (a rod, gear train, etc.) to the first disk via eccentric holes—other linkages, such as mating gears between disks can be used to simultaneously drive further disks, thereby providing a multiple moving-head power toothbrush.
In an illustrative embodiment, the case comprises a pair of halves that hold the drive train motor and associated components in position and are sealed by welding or other adhesion techniques. The bottom of the case may be open to receive batteries. An outer cover sleeve is fitted over the lower portion of the case to seal the bottom and provide a decorative outer shell that also provides the handle. A sealing ring may be provided between the case and outer sleeve to prevent infiltration of moisture. Likewise, the toothbrush shaft and head assembly can include a plurality of slots or holes for draining moisture away from the regions outside the elastomeric shaft seal. A decorative, sculpted topper can be provided above the outer sleeve mounted along the toothbrush shaft with an apron that extends along the case toward the upper edge of the outer sleeve.
The invention description below refers to the accompanying drawings, of which:
The present application is related to commonly assigned U.S. patent application Ser. No. 10/237,902, filed Sep. 9, 2002, by Robert D. Banning entitled TOPPER FOR A POWER TOOTHBRUSH, the teachings of which are expressly incorporated by reference.
The case narrows to a pair of hollow half sections 250 and 252 of the toothbrush shaft 112. Within the shaft half sections 250, 252 are a series of shaft guides 260, 262 and 264. These reside in slots that are provided within the hollow toothbrush shaft to retain the guides in place. A reciprocating drive shaft 270 (described further below) is guided in a linear reciprocating motion by the guides 260, 262 and 264. The drive shaft 270 is generally straight along the majority of its length, extending along a linear axis of movement. Approximately half way along the length of the shaft 270 is provided a surrounding seal 272 constructed from an elastomeric material such as silicone. The seal is shaped generally as a cup having a cup section 333 that includes a relatively thin circumferential wall and hollowed interior with a hole sized closely to or slightly smaller than the diameter of the drive shaft 270. Note that the hollowed cup end faces toward the motor in this embodiment and abuts the adjacent retaining wall or abutment 334. The seal allows the shaft 270 to slide in a reciprocating motion, but prevents moisture from penetrating into the lower portion of the hollow toothbrush shaft or case. It is retained by the walls or abutments 334 and 335 (
Note that all walls or abutments along the toothbrush shaft 112 are sized to include appropriately sized cutouts (either circles or another appropriate shape). These cutouts are sized and arranged to enable the drive shaft and drive plate to move freely through the cutouts (in both axial and side-to-side motion as appropriate), but to adequately retain and/or seal the various guides and seals described herein.
Within the head assembly 114 are a pair of rotating disks, 290 and 292 in communication with the drive shaft 270. The disks are joined by a short connecting link 294 so that motion applied to the disk 290 by the shaft 270 is transmitted to the more-distal disk 292. Each disk is in turn connected by a snap fitting to a brush head 296 and 298. With further reference to
The motor 218 is connected via a pinion gear 310 to a rotary rack 312. As shown also in
Referring to
The end 373 of the drive shaft 270 is bent into a downward L-shape (see
As described generally above, the size and shape of the cup seal 272 and the relative diameters of the walls 334 and 335 accommodate the solid, unpivoted link between the disk 290 and end 373 of the drive shaft 270. The side-to-side motion (double arrow 386) generated as the disk 290 rotates and the shaft rides in its eccentric hole through a desired range of arcuate rotation. In other words, the hole will translate orthogonally to the axis of extension of the drive shaft 270 as the disk rotates about its axis.
Note that in one embodiment, the cup seal 272 can include, within it's cup a flush-fitting ring or washer 384 (shown in phantom), typically constructed of a lubricating plastic that prevents excessive side-to-side flexure that may otherwise undesirably kink or bend the seal and allow moisture to pass between the seal 272 and wall 334. Such undesirable bending tends to increase when the travel distance of the drive shaft 270 is increased to increase the rotational distance of the heads.
With further reference to the details of
With particular reference to
The drive plate 318 is retained against upward movement out of engagement with drive pin 314 by an opposing projection 319 (
Note also that the guide 260 comprises two halves that enable the drive plate 318 to be mounted therebetween during assembly. A cruciform projection 530 in at least one wall of the toothbrush shaft maintains proper rotational alignment of the guide half. A similar projection can be provided to the bottom half (not shown).
The motor makes contact with a switch contact plate 540, that extends forwardly to the rack base 542. A well is provided in the rack base 542 for receiving the end of the contact plate. An opposing contact plate 550 extends from the battery contacts 222 via a wire 552 to the switch assembly 104. The end of the plate 550 is sprung so as to bias the switch outwardly away from the opposing contact plate 540. By applying a downward force (arrow 556) the plates are brought into contact. The switch button is slideable forwardly (arrow 558) when it is depressed so that a shoulder 560 becomes engaged to the underside of the case, thus holding the button in place with the contact plates 540 and 550 in engagement (thereby making electrical contact). In this manner, both a momentary contact position is enabled (by a simple downward push) and a full-time on position is enabled (by a downward push followed by a forward slide). An elastomeric seal 570 is provided between the button and the contact plate to both cushion the button and prevent moisture infiltration.
It is further contemplated, in an alternate embodiment (not shown), that the drive plate and pin (318 and 314) can be replaced with a connecting rod that is pivotally mounted between the drive shaft (270) and the rack 312 with the rack's pivot offset from the rack's axis of rotation. Like the above-described slot and eccentric pin arrangement, this type of linkage provides the desired conversion of a unidirectional rotation (by the rack) into a linear reciprocating motion (for the drive shaft). Accordingly, the term “eccentric link” when used herein shall define any acceptable arrangement that converts unidirectional rotation of a rack or other rotating, driven disk into a linear reciprocating (bi-directional) motion of an operatively connected drive shaft.
In this embodiment, the drive train is structurally and/or functionally similar to that shown and described in the embodiments of
Where a solid case with no outer sleeve is provided, batteries 750 (shown in phantom) can be inserted and removed via a rear plate 752 having a screw 754 that engages the rear of the case 710 and that includes a battery contact plate 756. An O-ring or other seal can be provided around the plate to prevent water infiltration. In an alternate embodiment, the decorative handle (i.e., the car body) can be slid over a case such as the case 210 and 212 shown in
In the embodiment of
The foregoing has been a detailed description of various embodiments of the invention. A variety of modification and additions can be made without departing from the spirit and scope thereof. For example, it should be clear that a wide variety of shapes can be provided to both the topper and to the main handle of the toothbrush. The exact size and dimension of various drive train features is widely variable, as is the length of the toothbrush shaft. In general, the toothbrush shaft should be able to fit within the mouth of a small child or adult where applicable. Likewise, the handle and buttons should be sized so that they accommodate the chosen user. The size and shape of the on/off button are also widely variable, as is their method of operation. Accordingly, this description is meant only to be taken as way of example and not to otherwise limit the scope of the invention.
This application is a continuation of U.S. application Ser. No. 10/331,799, filed Dec. 30, 2002, now abandoned which is incorporated herein by reference.
Number | Name | Date | Kind |
---|---|---|---|
793587 | Johnson | Jun 1905 | A |
1212001 | Baxter | Jan 1917 | A |
1255028 | Leonard et al. | Jan 1918 | A |
1392623 | Cheatham | Oct 1921 | A |
1517320 | Stoddart | Dec 1924 | A |
1553456 | Metrakos | Sep 1925 | A |
1557244 | Dominque | Oct 1925 | A |
1896731 | Lippett | Feb 1933 | A |
1981688 | Conti | Nov 1934 | A |
1997352 | Fleet | Apr 1935 | A |
2044863 | Sticht | Jun 1936 | A |
2140307 | Belaschk et al. | Dec 1938 | A |
2172624 | Robert | Sep 1939 | A |
2215031 | Elmore | Sep 1940 | A |
2379049 | Tompkins | Jun 1945 | A |
2435421 | Blair | Feb 1948 | A |
2601567 | Steinberg | Jun 1952 | A |
3115652 | Zerbee | Dec 1963 | A |
3129449 | Cyzer | Apr 1964 | A |
3159859 | Rasmussen | Dec 1964 | A |
3160902 | Aymar | Dec 1964 | A |
3178754 | Cleverdon | Apr 1965 | A |
3195537 | Blasi | Jul 1965 | A |
3242516 | Cantor | Mar 1966 | A |
3379906 | Spohr | Apr 1968 | A |
3398421 | Rashbaum | Aug 1968 | A |
3509874 | Stillman | May 1970 | A |
3524088 | Ryckman | Aug 1970 | A |
3538530 | Stemme | Nov 1970 | A |
3588936 | Duve | Jun 1971 | A |
3592188 | Barnett | Jul 1971 | A |
3935869 | Reinsch | Feb 1976 | A |
3945076 | Sung | Mar 1976 | A |
3978852 | Annoni | Sep 1976 | A |
4027348 | Flowers et al. | Jun 1977 | A |
4156620 | Clemens | May 1979 | A |
4175299 | Teague, Jr. et al. | Nov 1979 | A |
4274173 | Cohen | Jun 1981 | A |
4281987 | Kleesattel | Aug 1981 | A |
4326314 | Moret et al. | Apr 1982 | A |
4346492 | Solow | Aug 1982 | A |
4397055 | Cuchiara | Aug 1983 | A |
4545087 | Nahum | Oct 1985 | A |
4603448 | Middleton et al. | Aug 1986 | A |
4791945 | Moriyama | Dec 1988 | A |
4795347 | Maurer | Jan 1989 | A |
4827550 | Graham et al. | May 1989 | A |
4845795 | Crawford | Jul 1989 | A |
4974278 | Hommann | Dec 1990 | A |
4989287 | Scherer | Feb 1991 | A |
4995131 | Takeda | Feb 1991 | A |
5033150 | Gross et al. | Jul 1991 | A |
5054149 | Si-Hoe et al. | Oct 1991 | A |
5068939 | Holland | Dec 1991 | A |
5070567 | Holland | Dec 1991 | A |
5077855 | Ambasz | Jan 1992 | A |
5088145 | Whitefield | Feb 1992 | A |
5120225 | Amit | Jun 1992 | A |
5138734 | Chung | Aug 1992 | A |
5148567 | Daub | Sep 1992 | A |
5170525 | Cataro | Dec 1992 | A |
5186627 | Amit et al. | Feb 1993 | A |
5226206 | Davidovitz et al. | Jul 1993 | A |
5253382 | Beny | Oct 1993 | A |
5259083 | Stansbury, Jr. | Nov 1993 | A |
5276932 | Byrd | Jan 1994 | A |
5301381 | Klupt | Apr 1994 | A |
5311633 | Herzog et al. | May 1994 | A |
5321866 | Klupt | Jun 1994 | A |
5353460 | Bauman | Oct 1994 | A |
5359747 | Amakasu | Nov 1994 | A |
5383242 | Bigler et al. | Jan 1995 | A |
5398366 | Bradley | Mar 1995 | A |
5404608 | Hommann | Apr 1995 | A |
5416942 | Baldacci et al. | May 1995 | A |
5448792 | Wiedemann et al. | Sep 1995 | A |
5465444 | Bigler et al. | Nov 1995 | A |
5493747 | Inakagata et al. | Feb 1996 | A |
5504958 | Herzog | Apr 1996 | A |
5504959 | Yukawa et al. | Apr 1996 | A |
5524312 | Tan et al. | Jun 1996 | A |
5528786 | Porat et al. | Jun 1996 | A |
5577285 | Drossler | Nov 1996 | A |
5617601 | McDougall | Apr 1997 | A |
5617603 | Mei | Apr 1997 | A |
5625916 | McDougall | May 1997 | A |
5679991 | Wolf | Oct 1997 | A |
5687442 | McLain | Nov 1997 | A |
5727273 | Pai | Mar 1998 | A |
5732432 | Hui | Mar 1998 | A |
5732433 | Droessler et al. | Mar 1998 | A |
5738575 | Bock | Apr 1998 | A |
5778474 | Shek | Jul 1998 | A |
5784743 | Shak | Jul 1998 | A |
RE35941 | Stansbury, Jr. | Nov 1998 | E |
5836030 | Hazeu et al. | Nov 1998 | A |
5842244 | Hilfinger | Dec 1998 | A |
5842245 | Pai | Dec 1998 | A |
5850655 | Göcking et al. | Dec 1998 | A |
5862558 | Hilfinger et al. | Jan 1999 | A |
5867856 | Herzog | Feb 1999 | A |
5956797 | Wilson | Sep 1999 | A |
5974613 | Herog | Nov 1999 | A |
5974615 | Schwarz-Hartmann et al. | Nov 1999 | A |
6000083 | Blaustein et al. | Dec 1999 | A |
6049936 | Holley | Apr 2000 | A |
6106290 | Weissman | Aug 2000 | A |
6138310 | Porper et al. | Oct 2000 | A |
6178579 | Blaustein et al. | Jan 2001 | B1 |
6189693 | Blaustein et al. | Feb 2001 | B1 |
6195828 | Fritsch | Mar 2001 | B1 |
6237178 | Krammer et al. | May 2001 | B1 |
6308359 | Fritsch et al. | Oct 2001 | B2 |
6311837 | Blaustein et al. | Nov 2001 | B1 |
6347425 | Fattori et al. | Feb 2002 | B1 |
6360395 | Blaustein et al. | Mar 2002 | B2 |
6371294 | Blaustein et al. | Apr 2002 | B1 |
6421865 | McDougall | Jul 2002 | B1 |
6421866 | McDougall | Jul 2002 | B1 |
6434773 | Kuo | Aug 2002 | B1 |
6446294 | Specht | Sep 2002 | B1 |
6453498 | Wu | Sep 2002 | B1 |
6463615 | Gruber et al. | Oct 2002 | B1 |
6510575 | Calabrese | Jan 2003 | B2 |
6536066 | Dickie | Mar 2003 | B2 |
6546585 | Blaustein et al. | Apr 2003 | B1 |
6564940 | Blaustein et al. | May 2003 | B2 |
6574820 | DePuydt et al. | Jun 2003 | B1 |
6623698 | Kuo | Sep 2003 | B2 |
6725490 | Blaustein et al. | Apr 2004 | B2 |
6751823 | Biro et al. | Jun 2004 | B2 |
6760945 | Ferber et al. | Jul 2004 | B2 |
6760946 | DePuydt | Jul 2004 | B2 |
6836917 | Blaustein et al. | Jan 2005 | B2 |
6889401 | Fattori et al. | May 2005 | B2 |
6892412 | Gatzemeyer et al. | May 2005 | B2 |
6892413 | Blaustein et al. | May 2005 | B2 |
6928685 | Blaustein et al. | Aug 2005 | B1 |
6944901 | Gatzemeyer et al. | Sep 2005 | B2 |
6952854 | Blaustein et al. | Oct 2005 | B2 |
6966093 | Eliav et al. | Nov 2005 | B2 |
6983507 | McDougall | Jan 2006 | B2 |
7124461 | Blaustein et al. | Oct 2006 | B2 |
7137163 | Gatzemeyer et al. | Nov 2006 | B2 |
7140058 | Gatzemeyer et al. | Nov 2006 | B2 |
7140059 | Scherl | Nov 2006 | B2 |
7150061 | Kwong | Dec 2006 | B2 |
7162764 | Drossler et al. | Jan 2007 | B2 |
7225494 | Chan et al. | Jun 2007 | B2 |
7258747 | Vago et al. | Aug 2007 | B2 |
7302726 | Braun | Dec 2007 | B2 |
7356866 | Chan | Apr 2008 | B2 |
7386904 | Fattori | Jun 2008 | B2 |
7392562 | Boland et al. | Jul 2008 | B2 |
7421753 | Chan et al. | Sep 2008 | B2 |
7430777 | Scherl | Oct 2008 | B2 |
7430778 | Gatzemeyer et al. | Oct 2008 | B2 |
7451514 | Blaustein et al. | Nov 2008 | B2 |
7520016 | Kressner | Apr 2009 | B2 |
7552497 | Gatzemeyer et al. | Jun 2009 | B2 |
20010022277 | Blaustein et al. | Sep 2001 | A1 |
20020017474 | Blaustein et al. | Feb 2002 | A1 |
20020020645 | Blaustein et al. | Feb 2002 | A1 |
20020029988 | Blaustein et al. | Mar 2002 | A1 |
20020032941 | Blaustein et al. | Mar 2002 | A1 |
20020038772 | Blaustein et al. | Apr 2002 | A1 |
20020059685 | Paffrath | May 2002 | A1 |
20020078514 | Blaustein et al. | Jun 2002 | A1 |
20020138926 | Brown, Jr. | Oct 2002 | A1 |
20020152564 | Blaustein et al. | Oct 2002 | A1 |
20030000033 | Lev et al. | Jan 2003 | A1 |
20030066145 | Prineppi | Apr 2003 | A1 |
20030074751 | Wu | Apr 2003 | A1 |
20030084525 | Blaustein et al. | May 2003 | A1 |
20030084526 | Brown et al. | May 2003 | A1 |
20030084527 | Brown et al. | May 2003 | A1 |
20030140435 | Eliav et al. | Jul 2003 | A1 |
20030140437 | Eliav et al. | Jul 2003 | A1 |
20030154567 | Drossler et al. | Aug 2003 | A1 |
20030163881 | Driesen et al. | Sep 2003 | A1 |
20030163882 | Blaustein et al. | Sep 2003 | A1 |
20030182746 | Fattori et al. | Oct 2003 | A1 |
20030196283 | Eliav et al. | Oct 2003 | A1 |
20030213075 | Hui et al. | Nov 2003 | A1 |
20030226223 | Chan et al. | Dec 2003 | A1 |
20040045105 | Eliav et al. | Mar 2004 | A1 |
20040060137 | Eliav et al. | Apr 2004 | A1 |
20040074026 | Blaustein et al. | Apr 2004 | A1 |
20040083566 | Blaustein | May 2004 | A1 |
20040088807 | Blaustein et al. | May 2004 | A1 |
20040143917 | Ek | Jul 2004 | A1 |
20040168272 | Prineppi | Sep 2004 | A1 |
20040177458 | Chan et al. | Sep 2004 | A1 |
20040177462 | Brown, Jr. | Sep 2004 | A1 |
20050000043 | Chan et al. | Jan 2005 | A1 |
20050000045 | Blaustein | Jan 2005 | A1 |
20050091771 | Blaustein et al. | May 2005 | A1 |
20050102776 | Mathur | May 2005 | A1 |
20050155167 | Gall | Jul 2005 | A1 |
20050268409 | Blaustein et al. | Dec 2005 | A1 |
20050278874 | Blaustein et al. | Dec 2005 | A1 |
20060032006 | Gall | Feb 2006 | A1 |
20060048314 | Kressner | Mar 2006 | A1 |
20060048315 | Chan et al. | Mar 2006 | A1 |
20060137118 | Blaustein | Jun 2006 | A1 |
20060254006 | Blaustein et al. | Nov 2006 | A1 |
20060254007 | Banning | Nov 2006 | A1 |
20070251033 | Gall | Nov 2007 | A1 |
20080010761 | Blaustein et al. | Jan 2008 | A1 |
20080016633 | Blaustein et al. | Jan 2008 | A1 |
20080078040 | Braun | Apr 2008 | A1 |
20090106923 | Boland | Apr 2009 | A1 |
Number | Date | Country |
---|---|---|
2271352 | Jul 1996 | CN |
2236827 | Oct 1996 | CN |
2271353 | Oct 1996 | CN |
2274947 | Feb 1998 | CN |
1187341 | Jul 1998 | CN |
2324987 | Jun 1999 | CN |
2324988 | Jun 1999 | CN |
2681701 | Mar 2005 | CN |
3406112 | Aug 1985 | DE |
3544256 | Aug 1987 | DE |
4003305 | Aug 1991 | DE |
29600236 | Apr 1996 | DE |
29613608 | Nov 1996 | DE |
29618755 | Mar 1997 | DE |
19701964 | Jul 1998 | DE |
298 09 977 | Feb 1999 | DE |
19802904 | Jul 1999 | DE |
19803311 | Aug 1999 | DE |
259648 | Mar 1988 | EP |
1053721 | Nov 2000 | EP |
1059049 | Dec 2000 | EP |
2247297 | Feb 1992 | GB |
2290224 | Dec 1995 | GB |
2319170 | May 1998 | GB |
40-8743 | Aug 1965 | JP |
57-89810 | Jun 1982 | JP |
2-19241 | Feb 1990 | JP |
02-218309 | Aug 1990 | JP |
05-146313 | Jun 1993 | JP |
05-146314 | Jun 1993 | JP |
7-116020 | May 1995 | JP |
7-116021 | May 1995 | JP |
7-116023 | May 1995 | JP |
07-116024 | May 1995 | JP |
7-93892 | Oct 1995 | JP |
8-322641 | Oct 1996 | JP |
10-066704 | Mar 1998 | JP |
2804940 | Jul 1998 | JP |
1984-0004668 | Sep 1984 | KR |
1986-0001137 | Jun 1986 | KR |
1994-0013418 | Jul 1994 | KR |
1995-0002814 | Feb 1995 | KR |
1995-0010820 | May 1995 | KR |
1997-0000408 | Jan 1997 | KR |
1997-0000409 | Jan 1997 | KR |
1995-0024551 | Apr 1998 | KR |
143460 | Apr 1998 | KR |
248031 | Dec 1982 | TW |
233472 | May 1983 | TW |
274724 | Apr 1984 | TW |
256049 | Jan 1993 | TW |
238504 | Jun 1993 | TW |
253174 | Jul 1994 | TW |
294031 | Nov 1994 | TW |
239964 | Feb 1995 | TW |
309753 | Jul 1997 | TW |
330411 | Apr 1998 | TW |
406557 | Sep 2000 | TW |
257968 | Jul 2006 | TW |
WO 9912492 | Mar 1999 | WO |
WO 0106946 | Feb 2001 | WO |
WO 0106947 | Feb 2001 | WO |
WO 0121094 | Mar 2001 | WO |
WO 0143586 | Jun 2001 | WO |
WO 02102187 | Dec 2002 | WO |
WO 03020159 | Mar 2003 | WO |
WO 2004045448 | Jun 2004 | WO |
Number | Date | Country | |
---|---|---|---|
20060254007 A1 | Nov 2006 | US |
Number | Date | Country | |
---|---|---|---|
Parent | 10331799 | Dec 2002 | US |
Child | 11489906 | US |