Sanitary lavatory seat system
BACKGROUND OF THE INVENTION 
     The present invention relates to a sanitary lavatory seat and more particularly to a structure for providing a right and a left paper or plastic roll for stretching to respectively cover the right and the left lavatory seat plates so as to keep the lavatory seat always in a sanitary condition. 
     A regular lavatory bowl comprises a lavatory seat and a lavatory cover that can be lifted. Any person who uses a lavatory bowl shall have to sit on the lavatory seat with one&#39;s thigh and hip. This is not sanitary, and furthermore a person who suffers from skin disease or infectious disease can easily to infect others. Although many people have noted this problem and tried to make improvements, there is still no product which has to be proven to be satisfactory. 
     In order to settle the above-mentioned problems, the present invention has finally been created with a main object of providing a sanitary lavatory seat which is always kept in a clean and sanitary condition for use. 
     The sanitary lavatory seat, according to the present invention, is mainly comprised of : a lavatory seat, the front end of said lavatory seat having bilaterally a transverse flat portion, and a casing fixedly allocated at the back of lavatory bowl; said casing comprising interiorly one set of paper roll wheel axles and one take-up wheel axle; said paper roll wheel axles are for allocation of paper rolls;the terminal end of each paper roll is pulled out of the casing from a bottom hole to cover the top surface of the lavatory seat and to be deflected at the front end of the lavatory seat to run under the bottom of the lavatory seat and finally to wind round the take-up wheel axle; said take-up wheel axle is connected with a driving mechanism; by means of the driving mechanism, the take-up wheel axle is rotated and to let the paper wind round the take-up wheel axle so as to let the papers that cover the right and left-hand surfaces of the lavatory seat make a synchronous movement for a fixed length, i.e. to let the seated paper move to conceal itself behind the lavatory seat around the take-up wheel axle, and at the same time, to let clean and new paper cover the lavatory seat 2 for next use. 
     Another object of the present invention is to provide a satitary lavatory seat wherein the casing is mainly comprised of a bottom holder, a middle holder and two side covers; said bottom holder comprises slots at the bottom for fixation of the bottom holder onto a lavatory bowl at the back, a connection hole at the front for connection of the bottom holder with the lavatory seat, and division walls around its periphery and the middle part to divide itself into three portions; said middle holder is fixed at the center and said side covers are bilaterally allocated at both ends; said middle holder comprises bilaterally one protruding wheel axle at each side for allocation of a paper roll, and a take-up wheel axle at the lower portion with both ends of the take-up wheel axle protruding beyond the side walls of the middle holder for the terminal end of the paper roll to wind thereabout; the present sanitary lavatory seat also comprises a driving mechanism which is to set a sector gear at the wheel axle for 2 paper roll, and to set a vertical axle at the top of the middle holder in the center with one hand wheel attached at the top end and with one sector gear attached at the lower end letting the sector gear engage the sector gear of the wheel axle, by means of manual operation whereby the take-up wheel axle is rotated. 
     Another object of the present invention is to provide a sanitary lavatory seat wherein the driving mechanism is motorized, i.e. to set a driving motor in the middle holder of the casing to connect with the take-up wheel axle by means a gear or belt through a pivot joint so as to drive the take-up wheel to rotate. 
     Another object of the present invention is to provide a sanitary lavatory seat wherein the take-up wheel axle is slipped with a wheel hub such that the waste paper of the paper roll can be easily removed for replacement. 
     Another object of the present invention is to provide a sanitary seat wherein the flat portion at the front of the lavatory seat comprises bilaterally a downward lug at both sides on the bottom to prohibit right or left displacement of the paper of each paper roll. 
     Yet a further object of the present invention is to provide a sanitary lavatory seat wherein the paper rolls or plastic rolls used are printed with marks to facilitate precise movement of the paper or the plastic. 
     Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art this detailed description. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus, are not limitative of the present invention, and wherein: 
     FIG. 1 is a fragmentary perspective view of a sanitary lavatory seat embodying the present invention; 
     FIG. 2 is a perspective view of one preferred embodiment according to the present invention; and 
     FIG. 3 is a fragmentary perspective view of the other preferred embodiment according to the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring to FIG. 1 and FIG. 2, the sanitary lavatory seat according to the present invention comprises a lavatory seat (10) and a casing (20) composed of a bottom holder (21), a middle holder (22) and two side covers (23) (24). The casing has two inside wheel axles (31) (32) for allocation of respective paper rolls, a take-up wheel axle (33), a vertical axle 34, a wheel hub (35), two paper or plastic rolls (36) (37), and two paper guide rods (38) (39). 
     The lavatory seat (10) comprises a protruding portion (11) at the rear end having a draft hole (12) for bolt (13) to penetrate and thereby pivotally connect the bottom holder (21) through the hole (211) of the bottom holder (21) such that the lavatory seat (10) can be lifted against the bottom holder (21). Said lavatory seat (10) is characterized by its two flat portions (14) (15) which are bilateral at the front, each of said flat portions (14) (15) comprising a respective lug (141) (151) at the bottom to prohibit the paper of the paper roll from right-handed or left-handed displacement. By means of the design of the draft hole of the protruding portion (11), the whole body of the lavatory seat (10) is arranged to be slightly inclined toward the front. 
     The bottom holder (21) of the casing (20) has two slots (212) (213) for fixation of the bottom holder (21) to the lavatory bowl (100) by means of respective bolts through the bolt holes of the lavatory bowl (100). The bottom holder (21) also has division walls around its periphery and the middle part to divide itself into three portions, wherein the hole (214) is for a bolt (215) to fix the middle holder (22) onto the bottom holder (21). Said middle holder (22) has two fixed wheel axles (31) (32) with two washers (311) (321) and two paper rolls (or plastic rolls) (36) (37) respectively attached thereto. A take-up wheel axle (33) extends transversely crossing through the side walls (221) (222) of the middle holder (22) with one driving wheel (331) fixedly attached at both ends. Each of said driving wheels (331) has a groove (332). When wheel hubs (35) are bilaterally slipped over the take-up axle (33) at both ends the protruding portion (351) of each wheel hub (35) engages with the groove (332) of each driving wheel (331) to let the wheel hub (35) rotate with the respective wheel axle (33). Said take-up wheel axle (33) comprises a sector gear (333) engaged with the sector gear (341) of the vertical axle (34). Said vertical axle (34) comprises a hand wheel (342) at the top for manual operation to turn the wheel hub (35) for rotation. Said middle holder (22) also comprises two fixed paper guide rods (38) (39) for guiding the paper rolls (36) (37) in a way that the end of each paper roll (36) (37) is pulled to run beneath the paper guide rod (38) to cover the top surface of the lavatory seat (10) and the flat portion (14) (15) and is deflected at the front end of respective flat portion (14) (15) to run under the bottom of the lavatory seat (10) and beneath the paper guide rod (39) to wind round the wheel hub (35). If paper rolls or plastic rolls (36) (37) are printed with marks at proper intervals, it will help the user to precisely replace the paper or plastic when manually operating the hand wheel (342). Further, the side walls (221) (222) of the middle holder (22) comprise respective projections (223) for connecting respective side covers (23) (24) by means of protecting joints. When the paper rolls (36) are to be replaced, both side covers (23) (24) should be moved away. 
     The driving mechanism of the sanitary lavatory seat according to the present invention can be a mechanical type as shown in FIG. 1 which consists of one vertical axle (34), two sector gears (333) (341), and one hand wheel (342), or the driving mechanism can also be a motor (40) for driving the take-up wheel axle (33) as shown in FIG. 3. Furthermore, the front end of the lavatory seat (10) can also be in a configuration as shown in FIG. 3 wherein the front end of the lavatory seat (10) comprises two circular ar portions (14) (15) for easy sliding of respective paper rolls (36) (37). When not in use, the lavatory seat (10) is slightly lifted by means of a spring (50) as shown in FIG. 3 such that the lavatory seat (10) is not in contact with the lavatory bowl (100) to facilitate circling of paper rolls (36) (37). 
     The preferred embodiment according to the present invention, as described above, has been proven to be practicable and can provide the effectiveness expected. However, the above described preferred embodiments are just examples for full understanding and any modification based on the concept of the present invention shall not be regarded as a departure from the spirit and scope of the invention, and al such modifications as would be obvious to one skilled in the art are intended to be included within the scope of the present application.