reference will first be made to fig1 to 3 , which show , by way of a non - limiting example , the application of the present invention to a standard toilet pan . fig1 shows the toilet pan 10 , which possesses , in the customary manner , two holes 11 provided , by construction , in its rear top area 12 . in accordance with the invention , a seat for the pan 10 consists of a disposable and frequently interchangeable annular member 13 . the member 13 is designed to be virtually undeformable and is made of a bulky , light , asepticised and thermally insulating plastics material , such as expanded polystyrene , which offers every assurance because it is accepted as packaging in the food industry . alternately , the seat can advantageously consist of an inflatable cushion , for example having an envelope made of a material of the rubber type or of plastics material or of impermeable gauze . this cushion is preferably stored deflated , and hence in a form having a low bulk , and can be inflated immediately by releasing a suitably precharged compressed - air pellet . the seat 13 is advantageously packed before use in a tamper - proof aseptic envelope e ( fig3 ). the interchangeable seat 13 comprises positioning members 14 . in the example shown in fig1 to 3 , these members consist of projecting studs 14 integral with the seat 13 . these studs 14 are designed to be immediately inserted in the holes 11 in the pan 10 . it will be appreciated that the studs 14 constitute positioning members which can immediately be inserted and removed and which are designed to co - operate with the holes 11 , which themselves constitute complementary members associated with the pan 10 . a seat of this type can be used without a lid , in particular in hotels and in hospitals ( for epidemics ) and other public places , and makes it possible to prevent a new user from sitting on a toilet contaminated by microbes or viruses against which he may not be immunised . it will be noted that the seat 13 makes it possible to avoid any permanent attachment to the pan 10 and that this pan can thus be easily maintained in a perfect state of cleanliness , using common cleaning products . the replacement of a seat by a new seat is effected immediately in a convenient manner , without requiring any fittings . the new user is assured of being the first user of the seat , by virtue of its plastic envelope which guarantees its sterility , and the user has only to remove this envelope before using the seat . it will moreover be noted that , by virtue of the material of which the seat 13 is made , there is no risk that the latter will damage the enamel of the pan 10 . reference will now be made to fig4 to 8 , which show a further embodiment provided with a lid . in this embodiment , the seat , designated by 13 &# 39 ; is analogous to the seat 13 which was described with reference to fig1 to 3 , and again possesses positioning members 14 &# 39 ; which can be immediately inserted and removed and which are designed to cooperate with complementary members 11 &# 39 ; associated with the pan . however , in this case , the members for positioning the seat 13 &# 39 ; consist of holes 14 &# 39 ; provided longitudinally in the seat , whilst the complementary members associated with the pan consist of pegs 11 &# 39 ;. the latter are mounted so as to pivot , at 15 , on a cross - piece 16 which is fixed to the rear top area 12 of the pan by means of screws 17 , which are inserted in the holes 11 and receive locking nuts . in the example shown in fig4 to 8 , the cross - piece 16 also receives a lid 18 mounted so as to pivot , at 19 , on this cross - piece . as in the preceding example , the seat 13 &# 39 ; is interchangeable . to take it off , it suffices to remove it immediately from the pegs 11 &# 39 ;, and to replace it , it suffices to insert the holes 14 &# 39 ; in the new seat over the pegs 11 &# 39 ;. as previously , the interchangeable seat 13 &# 39 ; offers every assurance of sterility and permits immediate positioning and easy maintenance . of course , the invention is not limited to the embodiments which have been described and shown , but encompasses all modified embodiments within the scope of the claims . the term annular member should be understood as meaning either a member forming a complete ring , as shown , or a member forming a partial ring , in the manner of a horseshoe .
a seat for a toilet pan comprises a disposable and interchangeable annular member arranged to be used in place of the customary flap - seat . the member has means for positioning it relative to the holes provided , in customary manner , in the rear top area of the pan . the positioning means are arranged such that the member can be rapidly and positioned simply and removed .