# Patent

## Title
Flossing device with internal floss feed

## Abstract

A flossing device having internal floss feed in which floss is advanced from a storage chamber inside the handle of the device, through feed gears, to a pair of spaced apart tines. Spent floss is returned through the return gears, the return drive gear having a greater diameter than the feed drive gear, thus ensuring the floss remains taut between the tines. An integral cutter allows the spent floss to be cut off and discarded. The cover over one or both sets of gears may be open at the top and bottom to allow cleaning of the gears. A flexible tile may be included over the aperture through which the floss exits the storage chamber to prevent water incursion therein. A floss advance lever advances the floss by a single action when pressed forward, which creates and maintains sufficient tension on the floss resulting in taut and snug floss between the tines. Optionally, the flossing head has a vibratory device to aid in the flossing action.

## Background
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a Continuation-In-Part of Ser. No. 11/858,232 filed on Sep. 20, 2007, now allowed.


BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to dental hygiene products. More particularly, the invention comprises a flossing device with internal storage of floss and an internal feed mechanism for progressing fresh floss through the flossing head.
2. Description of the Prior Art
Numerous flossing devices have been disclosed over the years, may with internal storage for the floss, and many of those with feed mechanisms for advancing the floss through the flossing tines.
Of particular note are U.S. Pat. No. 6,526,994 to Santoro on Mar. 4, 2003; U.S. Pat. No. 5,823,207 to Bushman on Oct. 20, 1998; U.S. Pat. No. 5,947,133 to Kossal, et al., on Sep. 7, 1999; U.S. Pat. No. 5,816,271 to Urso on Oct. 6, 1998; and U.S. Pat. No. 5,269,331 to Tanriverdi on Dec. 14, 1993.
In each case cited above, floss is fed from a supply spool through the tines and back to a take up spool, with all motivational forces being applied to the either the supply spool, the take up spool or both. In none of the above are the motivational forces applied directly to the floss, as in the present invention.
None of the above inventions and patents, taken either singly or in combination, is seen to describe the instant invention as claimed.
SUMMARY OF THE INVENTION
Dentists recommend regular flossing as one of the best ways to maintain dental hygiene and health. Many people, however, find the act of flossing clumsy and difficult. Flossing by hand requires stretching floss between the fingers of both hands and then working the fingers into the mouth, flossing a given area of the mouth, advancing the floss through the fingers and then flossing another area of the mouth. The advancing of the floss is important in order to prevent the spreading of germs and debris from one area of the mouth to another. By means of the internal mechanism provided by the present invention, the floss is easily refreshed by rotating the floss advance wheel.
The present invention provides flossing device which has a chamber within its hollow handle in which a spool of floss is stored. The free end of the floss is threaded through an array of feed gears to a pair of tines at the head of the device and back to the take up gears for take up. The floss is maintained taut between the tines of the head for effective flossing. In an alternative embodiment, an electrically operated vibrator is housed in the flossing head to aid in stimulating the gums and removal of dental debris.
Accordingly, it is a principal object of the invention to provide a flossing device that is easy to use.
It is another object of the invention to provide a flossing device which stores the floss internally.
It is a further object of the invention to provide a flossing device which is self cleaning.
Another object of the invention to provide a flossing device which can easily provide fresh floss for each tooth to be flossed.
It is, again, an object of the invention to provide a flossing device which maintains the floss in a taut state between the tines of the head for effective flossing.
Still another object of the invention to provide a flossing device which isolates clean floss from contaminated floss.
Still another object of the invention to provide a floss hollow chamber which is detachable for refilling purposes and water tight.
A further object of the invention to provide a flossing device which can easily be washed and cleaned after use without making the floss in the storage chamber wet or contaminated.
An additional object of the invention to provide a flossing device with vibratory action to aid in gum stimulation and removal of dental debris.
It is an object of the invention to provide improved elements and arrangements thereof in an apparatus for the purposes described which is inexpensive, dependable and fully effective in accomplishing its intended purposes.
These and other objects of the present invention will become readily apparent upon further review of the following specification and drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
Various other objects, features, and attendant advantages of the present invention will become more fully appreciated as the same becomes better understood when considered in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the several views, and wherein:
FIG. 1 is a top perspective view of the flosser of the present invention.
FIG. 2 is a bottom perspective view of the flosser of the present invention.
FIG. 3 is a top view of the flosser of the present invention.
FIG. 4 is a cross-sectional side view of the flosser of the present invention at line 4-4 of FIG. 3.
FIG. 5 is a partial top, partially cut-away view of the flosser of the present invention at 5 of FIG. 3.
FIG. 6 is a partial side, cut-away view of the left side of the flosser of the present invention at line 6-6 of FIG. 5
FIG. 7 is a partial side, cut-away view of the left side of the flosser of the present invention at line 7-7 of FIG. 5
FIG. 8 is an exploded top perspective view of the flosser of the present invention.
FIG. 9 is a side view of the threading tool of the flosser of the present invention.
FIG. 10 is a plan view of the flosser of the present invention with an oscillating head.
FIG. 11 is a side, cut-away view of the flosser of the present invention at line 11-11 of FIG. 10.
FIG. 12 is a top perspective view of an alternative embodiment of the flosser of the present invention.
FIG. 13 is an exploded top perspective view of the alternative embodiment of the flosser of the present invention.
FIG. 14 is a top view of the alternative embodiment of the flosser of the present invention.
FIG. 15 is a cross-sectional side view of the alternative embodiment of the flosser of the present invention at lines 15-15 of FIG. 14.
FIG. 16 is a perspective view of the preferred embodiment of the flosser of the present invention.
FIG. 17 is an exploded top perspective view of the preferred embodiment of the flosser of the present invention.
FIG. 18 is a top view of the preferred embodiment of the flosser of the present invention.
FIG. 19 is a cross-sectional side view of the preferred embodiment of the present invention at line 19-19 of FIG. 18.



DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The flosser 100 of the present invention, as shown in its assembled state at FIGS. 1 and 2, is depicted in further detail at FIGS. 3 through 8.
The flosser 100 has a body 102 having a hollow handle portion 104 at a first end, handle portion 104 having a threaded cap 106 at a first end of handle portion 104 and a threading aperture 108 at a second end of handle 104. Handle 104 is dimensioned and configured to comfortably fit into a human hand.
At a second end of body 102 is a head 110, head 110 extending longitudinally from the second end of handle 104. Head 110 is solid and substantially flat on its upper and lower surfaces, and is dimensioned and configured for the free end of head 110 to comfortably fit within a human mouth. At the free end of head 110 is a pair of tines 112f and 112r which are angled downwardly from the free end of head 110 at an angle which allows easy access to the teeth. (In the preceding and hereinafter, the designation “f” behind a number will refer to the feed side of the flosser 100 and the designation “r” the return side.) Each of tines 112f and 112r has a groove 114f and 114r, respectively, formed at the end thereof, the groups 114f and 114r being substantially in a plane with one another. Tines 112f and 112r each have a guide groove 124f and 124r′, respectively, formed proximate the edge thereof to aid in guiding floss 202f and 202r along the length thereof.
Proximate the juncture with handle 104, head 110 floss feed assembly 150 mounted within and on the two opposing sides of head 110 proximate its juncture with handle 104. Interior of head 110 is a floss feed lever well 151 formed along the longitudinal axis of head 110 proximate its juncture with handle 104. (While floss feed lever 151 could be closed at the bottom, as illustrated, it could likewise be formed passing fully through head 110). The floss feed assembly 150 consists of a floss feed gear 152 rotatably mounted at a first end of an axle pin 158, which is mounted through head 10 and floss feed lever well 151 and substantially normal thereto. A return gear 160 is, likewise, rotatably mounted at the second end of axle pin 158, feed gear 152, and return gear 160 being on opposite sides of head 110.
A feed drive gear 156 is rigidly mounted at a first end of a drive axle pin 162, which is mounted through head 110 and floss feed lever well 151, substantially normal thereto. A return drive gear 164 is, likewise, rigidly mounted at the second end of drive axle pin 162.
Axle pin 158 and drive axle pin 162 are positioned and feed gear 152 and return gear 160 and feed drive gear 156 and return drive gear 164 are dimensioned such that feed gear 152 engages feed drive gear 156 snugly, and the return drive gear 164 engages return gear 160 snugly.
A floss advance lever 166 has a first, free end and a second attachment end. An aperture 165 is formed through the floss advance lever 166 proximate the attachment end. Drive axle pin 162 passes through aperture 165 of floss advance lever 166, within floss advance lever well 151, thereby allowing floss advance lever 166 to rotatably engage drive axle pin 162. A ratchet gear 168 is fixedly attached to drive axle pin 162 at a point within floss advance lever well 151 at a point adjacent to floss advance lever 166, and a ratchet engagement member 167 is attached to the side of floss advance lever 166 such that an end of ratchet engagement member 167 engages ratchet gear 168. The engagement of ratchet gear 168 and ratchet engagement member 167 allows the floss advance lever 166 to rotate the drive axle pin 162 on a forward stroke of floss advance lever 166 and move freely on the back stroke of floss advance lever 166, thereby rotating feed drive gear 156 and return drive gear 164 in only one direction. A compression spring 170 returns the floss advance lever to the rearward position automatically.
A feed capstan 172 and a return capstan 176 are situated between feed drive gear 156 and return drive gear 164 and tines 112f and 112r, respectively, thereby aiding in guiding the floss 202 as it passes between the feed drive gear 156 and return gear 164 and the grooves 124f′ and 124r′ of tines 112f and 112r, respectively. Grooves 172a and 176a around the perimeters of capstans 172 and 176, respectively, retain the floss 202f and 202r on the capstans 172 and 176. Feed assembly housings 116f and 116r enclose the feed and return sides of feed assembly 150, respectively. It is preferable that feed assembly housing caps 116f and 116r leave the top and bottom of the feed assembly open to aid in the rinsing of the feed assembly 150 with running water.
A floss cutter 180, as is typically found on floss dispensers, is mounted on the lower surface of head 110.
A light weight, flexible tile 182, configured to conform to the face of the juncture wall between hollow handle 104 and head 110, aids in preventing water from infiltrating the interior of handle 104 through the threading aperture 108 during washing. Tile 182 has sufficient flexibility to allow the floss to easily pass through the threading aperture 108, while still conforming to the surface of the wall around threading aperture 108.
Referring now to FIGS. 3, 5, and 6, floss 202 from a spool 200 is fed through threaded aperture 108 to the floss feed assembly 150, using needle 300. The end of the floss 202 is then fed through feed gear 152 and feed drive gear 156, then into the groove 172a around feed capstan 172. The floss 202 is then fed along the guide groove 124f becoming floss 202f of a first tine 112f, through the tine groove 114f of the same tine 112f, and then through the tine groove 114r of the second tine 112r becoming 202r (In use, the floss 202f between the tines 112 becomes soiled with food debris, therefore, hereinafter, the soiled floss will be referred to as floss 202r, soiled floss being returned to the floss feed assembly 150.) The floss 202r is then fed through guide groove 124r and back to the floss feed assembly 150, where it passes between the return drive gear 164 and return gear 160 before passing to the floss cutter 180, where spent floss 202r may be cut off.
Return drive gear 164 has a larger diameter than does feed drive gear 156, thereby ensuring that the floss 202 is constantly under tension, preventing slack in the floss 202 between the tines 112. It should be noted that clean floss 202f and soiled floss 202r travel through different channels throughout the system. Floss is fed through the floss feed assembly 150 by ratcheting the floss advance lever 166 forward.
In use, the tines 112 of the flosser 100 should be placed within the mouth, with the floss 202 passing into the gap between two adjacent teeth. After flossing between the two teeth, the flosser 100 should be removed from the mouth and the floss 202 advanced between the tines 112 by ratcheting floss advance lever 166. This action should be repeated after flossing each pair of adjacent teeth. The used floss 202 may be periodically cut by cutter 180. After flossing, the floss feed assembly 150 should be cleaned by rinsing with running water, and the flosser 100 left to dry.
A threading needle 300 (FIG. 9) is provided to aid in the threading of floss through the threading aperture 108 of handle 104. Threading needle 300 has a shaft 302 which may be inserted through threading aperture 108 of head 110, and extended out the end of handle 104. A finger ring 304 is at a first end of the shaft 302 and an eye 306 at the second end. The end of a floss 202 form a spool 200 may be threaded through the eye 306 of needle 300 before withdrawing needle 300 from threading aperture 108. The floss 202 is then threaded through the flosser 100, as further defined hereinbelow.
In a second embodiment of the flosser 100A (FIGS. 10 and 11), a vibrator 400 may be added to the head 110 of flosser 100A. Vibrator 400 consists of a motor 402 with an eccentric head 404. Motor 402 is powered by an electrical cord (not shown) or battery (not shown) housed in the hollow handle 104. The vibration of vibrator 400 provides improved stimulation of the gums and cleaning of the teeth over the flosser 100, without the vibrator 400.
Following is a description of an alternative embodiment of the flosser of the invention. In FIGS. 12-15, which show this alternative embodiment, all elements having the same reference numerals used in the embodiment of FIGS. 1-11 should be understood to have the same function as they served in that embodiment. Numerals followed by (′) indicate cosmetic, minor modification or change in function. New numbers indicate a new part.
FIG. 12 shows a top perspective view of the alternative embodiment 100B of the flosser. As can be seen in FIGS. 13, 198 and 199 are male and female threads, respectively, which allow floss housing 195 and flosser body 148 to be releasably secured together by screw motion to enable refilling the floss 200 within housing 195. Tensioner 184 is a plastic or metal part which functions as a spring, pushing forward the axle pin 158′ within the oval axle pin apertures 178r′ and 178f′ resulting in tight engagement of feed drive gear 152 and feed gear 156 as well as return drive gear 164 and return gear 160, respectively. Axle pin drive apertures 174r and 174f and drive axle pin 162′ are circular in shape, with apertures 174r and 174f rotatably accommodating ends of the drive axle pin 162′ therein. Axle pin apertures 178r′ and 178f′ are oval shaped, leaving slack which allows tensioner 184 to press axle pin 158′ towards the axle drive pin 162′, thereby engaging said gears tightly. This snug arrangement thereby compensates for manufacturing deformities, eccentricness, and wear of the gears and also doesn't allow slipping of floss 200 routed along said gear engagements. A groove 186 is provided on the underside of tensioner 184, allowing the tensioner to compress when placed in position and expand consequently affecting spring action. The axle groove 190 function is retaining the tensioner 184 in the right position relative to the axle pin 158′. A feed capstan 172 and the feed groove 172a are used to guide the floss 202f from the feed drive gear 156 and feed gear 152 towards the groove 124f′. A return capstan 176 and return groove 176a are used to guide the floss 202r from the return groove 124r′ towards the return drive gear 164 and return gear 160. A threading aperture 108 allows floss 202f to pass between hollow handle 195 and flosser body 148.
A plastic flexible tile 182′, configured to cover and seal tightly the aperture 108, aids in preventing water from infiltrating the interior of handle 195 through the threading aperture 108 during washing. Flexible tile 182′ has sufficient flexibility to allow the floss 202f to easily pass through the threading aperture 108, while sealing tightly the end of aperture 108. Guiding capstan 154 grips floss as the floss is passing through its narrow and flexible slot and prevents the floss from becoming loose and disengaging from position between gears.
Advance lever 166′ fixedly and rigidly houses the outer surface of the outer casing of ratchet engagement member 168′ in aperture 165 of advance lever 166′. The ratchet engagement member 168′ is a clutch bearing, as known in the art, functioning in a manner that allows only a ratcheting rotation in one direction. The ratchet engagement member 168′ grips the drive axle 162′ ratchetably. By gripping the hollow handle 195 between the thumb and fingers of a human hand and pushing forward the advance lever 166′, the drive axle 162′ will rotate in a forward direction resulting in advancing the floss and creating tension in the floss between the feed drive gear 156 and return drive gear 164 simultaneously. The advance lever 166′ will return to its first position by force of the helical spring 170, as shown in FIG. 15, when released. The feed assembly housing cap 116f′, and return assembly housing cap 116r′ have been designed in order to protect the hands of the user and the feed and return assembly housing caps are easily removable for purposes of cleaning the gears and/or refilling the spool of floss 200. Feed assembly housing cap 116f′ is open at the bottom and the top allowing the user to rinse the soiled area of return drive gear 160 and 164 which contacts used portion of floss on return cycle. Return assembly housing cap 116r′ can also be opened at the top and bottom, if so desired. The push advance lever 166′ has been designed with an ergonomic shape. Flosser 100B further includes a cutter 180 to cut spent portions of the floss. The cutter is of similar nature and similar position to that shown in FIG. 8. The floss 202f and 202r are routed through the flosser 100B in a manner corresponding to that described above in reference to the first flosser embodiment 100. The flosser 100B alternatively can be equipped with vibrating mechanism corresponding to that described above in reference to the first flosser embodiment 100A.
Flosser 100C generally presented at FIGS. 16-19 represents the preferred embodiment of the present invention which utilizes the alternative floss feed assembly 500. Flexible tensioner 184 remains unchanged in the preferred embodiment.
All of the following description of the preferred embodiment will refer to FIGS. 16-19
Floss housing 195 and body connector 502 can be releasably secured together by screw motion to enable replacing the floss spool 200 within housing 195. Body connector 502 is fixedly attached to feed assembly housing 574 at the open end of feed assembly housing 574. Drive axle pin 558 is fixedly attached to return drive gear 552 at one end and to feed drive gear 560 at another end; drive axle pin 558 fixedly passes through the center of ratchet gear 572.
Extensions 504f and 504r which protrude from body connector 502, are placed between ratchet gear 572 and feed drive gear 560 and between ratchet gear 572 and return drive gear 552 respectively. Recesses 506f and 506r, which are located on the tip of extensions 504f and 504r respectively, allow extensions 504f and 504r to be placed in the right position relative to the drive axle pin 558, and push drive axle pin 558 forward against axle pin 562. Slots 576f and 576r are located at respective vertical sides of feed assembly housing 574, parallel to the longitudinal axis of the Flosser. Drive axle pin 558 and axle pin 562 are slidably and rotatably located inside slot 576f at one end and inside slot 576r at the opposite end. Return drive gear 552 and return gear 556 are positioned outside slot 576r, on the return side of feed assembly housing 574; and feed drive gear 560 and feed gear 564 are positioned outside slot 576f, on the feed side of feed assembly housing 574.
Flexible tensioner 184 is securely placed inside feed assembly housing 574 at the closed end of feed assembly housing 574. Groove 186 on the underside of tensioner 184, allows the tensioner to compress when placed in position and expand consequently effecting spring action. With axle groove 190 receiving axle pin 562, tensioner 184 is allowed to press axle pin 562 towards drive axle pin 558, thereby engaging said gears tightly. This snug arrangement thereby compensates for manufacturing deformities, eccentricness, and wear of the gears and also doesn't allow slipping of the floss routed along said gear engagements.
Pawl 570, a flat, spring-type material, is fixedly attached inside floss advance lever 566 beneath a thumb rest. The two sides of floss advance lever 566 extend downward from each side of the thumb rest; cavities 568f and 568r are located on floss advance lever 566 at the opposite end relative to the thumb rest. Floss advance lever 566 is inserted inside floss lever well 578 of feed assembly housing 574 and cavities 568f and 568r are placed between ratchet gear 572 and feed drive gear 560 and between ratchet gear 572 and return drive gear 552 respectively. Width of the opening of cavities 568f and 568r is smaller than the diameter of drive axle pin 558, such that when pressed against drive axle pin 158, the cavities' openings expand allowing drive axle pin 558 to enter inside the cavities and the openings return to their original sizes after the drive axle pin is entirely inside the cavities, thereby preventing floss advance lever 566 from detaching from drive axle pin 558.
Pawl 570 engages ratchet gear 572; when floss advance lever is pushed forward, pawl 570 forces ratchet gear 572 to rotate in the same direction only. Pawl 570 forces ratchet gear 572 and consequently drive axle pin 558, feed drive gear 560 and return drive gear 552 to rotate in the same forward direction, resulting in advancing the floss and creating tension in the floss between the feed gear 564 and return gear 556 simultaneously.
There are a pair of pins on each of the feed assembly caps 516f and 516r, allowing the feed assembly caps to be securely and removably attached to feed assembly housing 574 on feed and return sides of feed assembly housing 574 respectively.
It is to be understood that the present invention is not limited to the embodiments described above, but encompasses any and all embodiments within the scope of the following claims.

## Claims

1. A flossing device with internal floss feed comprising:
a flossing head adapted for insertion into the human mouth,
an assembly housing, said assembly housing having a longitudinal axis and supporting in side by side relation a drive axle pin and an axle pin, each pin having a longitudinal axis, whereby each of the pins is supported such that they can rotate about their respectively longitudinal axes and such that said axle pin can slide towards and away from said drive axle pin, said assembly housing being hollow and including two longitudinally extending slots in the housing, and opposite ends of each of said axle pin and said drive axle pin traversing a respective one of said slots and being supported thereby such that they can slide along the slots and rotate relative thereto,
a handle adapted for being gripped by the human hand and having structure for holding a spool of floss,
a body connector, said body connector having a first end and a second end, said handle being removably attached to said first end of said body connector, and said assembly housing being fixedly attached to said second end of said body connector,
a feed system for feeding said floss to said flossing head, said feed system comprising said drive axle pin, a feed drive gear having a diameter and being rigidly affixed to a first end of said drive axle pin and a feed gear rigidly affixed to a first end of said axle pin, said feed gear being in interconnecting, geared juxtaposition with said feed drive gear, whereby floss can pass between said feed drive gear and said feed gear only by rotating said feed drive gear and said feed gear, such that said floss is pulled from said spool and advanced beyond said feed drive gear and said feed gear,
spanning structure for spanning said floss between two points on said flossing head, said spanning structure sized for insertion of said floss between the teeth of a user, said spanning structure comprises a pair of tines at an end of said flossing head at a distance from said assembly housing,
a return system for returning a used portion of said floss from said flossing head, said return system comprises said axle pin, a return gear having a diameter and being rotatably affixed to a second end of said axle pin and a return drive gear fixedly affixed to a second end of said drive axle pin, and further comprises a flexible tensioner positioned to exert pressure against said axle pin to push it towards the drive axle pin, urging said return gear in interconnecting, geared juxtaposition with said return drive gear, whereby said floss can pass between said return gear and said return drive gear such that said floss is pulled from said tines and advanced beyond said return gear and said return drive gear, said flexible tensioner being located within said hollow assembly housing and including an axle groove which abuts and exerts pressure against said axle pin to push it towards said drive axle pin,
advancing structure for advancing said floss through said feed system and said return system.

2. A flossing device with internal floss feed, as defined in claim 1, wherein said diameter of said return drive gear is larger than the diameter of said feed drive gear, thereby ensuring that the floss remains taught between said tines.

3. A flossing device with internal floss feed, as defined in claim 1, wherein said body connector is attached to said handle by screw threads.

4. A flossing device with internal floss feed, as defined in claim 1, wherein said handle is hollow and has an internal compartment for containing said floss therein.

5. A flossing device with internal floss feed, as defined in claim 1, wherein said advance structure comprises:
a floss advance lever, a pawl fixedly attached to said floss advance lever, and said advance lever being rotatably affixed to said drive axle pin, a ratchet wheel fixedly mounted on said drive axle pin, said pawl ratchetingly engaged with said ratchet wheel, thereby allowing said floss advance lever to advance said feed drive gear and said return drive gear in only one direction, wherein said floss advance lever advancing said feed drive gear and said return drive gear causes said feed drive gear and said return drive gear, in turn, to drive said feed gear and said return gear respectively.

6. A flossing device with internal floss feed, as defined in claim 5, wherein said assembly housing further comprises:
a floss lever well allowing said floss advance lever to be rotatably attached to said drive axle pin inside said assembly housing,
a pair of slots, said slots being on two opposite sides of said assembly housing, wherein said drive axle pin and said axle pin are each rotatably supported at two points thereof within said pair of slots, said pair of slots oriented to allow said drive axle pin and said axle pin to slide within said pair of slots to the extent that tightness between said feed gear and said feed drive gear and between said return gear and said return drive gear is maintained.

7. A flossing device with internal floss feed, as defined in claim 1, wherein said feed gear, said feed drive gear, said return gear, and said return drive gear are each supported on the outside of said assembly housing.

8. A flossing device with internal floss feed, as defined in claim 1, wherein said body connector comprises at least one extension on said body connector, said at least one extension being received within the hollow assembly housing and including a recession which abuts said drive axle pin.