the flosser 100 of the present invention , as shown in its assembled state at fig1 and 2 , is depicted in further detail at fig3 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 112 f and 112 r 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 112 f and 112 r has a groove 114 f and 114 r , respectively , formed at the end thereof , the groups 114 f and 114 r being substantially in a plane with one another . tines 112 f and 112 r each have a guide groove 124 f and 124 r ′, respectively , formed proximate the edge thereof to aid in guiding floss 202 f and 202 r 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 112 f and 112 r , respectively , thereby aiding in guiding the floss 202 as it passes between the feed drive gear 156 and return gear 164 and the grooves 124 f and 124 r ′ of tines 112 f and 112 r , respectively . grooves 172 a and 176 a around the perimeters of capstans 172 and 176 , respectively , retain the floss 202 f and 202 r on the capstans 172 and 176 . feed assembly housings 116 f and 116 r enclose the feed and return sides of feed assembly 150 , respectively . it is preferable that feed assembly housing caps 116 f and 116 r 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 fig3 , 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 172 a around feed capstan 172 . the floss 202 is then fed along the guide groove 124 f becoming floss 202 f of a first tine 112 f , through the tine groove 114 f of the same tine 112 f , and then through the tine groove 114 r of the second tine 112 r becoming 202 r ( in use , the floss 202 f between the tines 112 becomes soiled with food debris , therefore , hereinafter , the soiled floss will be referred to as floss 202 r , soiled floss being returned to the floss feed assembly 150 .) the floss 202 r is then fed through guide groove 124 r 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 202 r 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 202 f and soiled floss 202 r 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 ( fig9 ) 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 100 a ( fig1 and 11 ), a vibrator 400 may be added to the head 110 of flosser 100 a . 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 fig1 - 15 , which show this alternative embodiment , all elements having the same reference numerals used in the embodiment of fig1 - 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 . fig1 shows a top perspective view of the alternative embodiment 100 b of the flosser . as can be seen in fig1 , 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 178 r ′ and 178 f 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 174 r and 174 f and drive axle pin 162 ′ are circular in shape , with apertures 174 r and 174 f rotatably accommodating ends of the drive axle pin 162 ′ therein . axle pin apertures 178 r ′ and 178 f 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 &# 39 ; 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 172 a are used to guide the floss 202 f from the feed drive gear 156 and feed gear 152 towards the groove 124 f . a return capstan 176 and return groove 176 a are used to guide the floss 202 r from the return groove 124 r ′ towards the return drive gear 164 and return gear 160 . a threading aperture 108 allows floss 202 f 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 202 f 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 fig1 , when released . the feed assembly housing cap 116 f ′, and return assembly housing cap 116 r ′ 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 116 f ′ 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 116 r ′ 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 100 b 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 fig8 . the floss 202 f and 202 r are routed through the flosser 100 b in a manner corresponding to that described above in reference to the first flosser embodiment 100 . the flosser 100 b alternatively can be equipped with vibrating mechanism corresponding to that described above in reference to the first flosser embodiment 100 a . flosser 100 c generally presented at fig1 - 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 fig1 - 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 504 f and 504 r 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 506 f and 506 r , which are located on the tip of extensions 504 f and 504 r respectively , allow extensions 504 f and 504 r 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 576 f and 576 r 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 576 f at one end and inside slot 576 r at the opposite end . return drive gear 552 and return gear 556 are positioned outside slot 576 r , on the return side of feed assembly housing 574 ; and feed drive gear 560 and feed gear 564 are positioned outside slot 576 f , 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 &# 39 ; 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 568 f and 568 r 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 568 f and 568 r 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 568 f and 568 r is smaller than the diameter of drive axle pin 558 , such that when pressed against drive axle pin 158 , the cavities &# 39 ; 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 516 f and 516 r , 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 .
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 .