referring to the drawings in particular , fig1 shows a filling device 1 with a filler neck 2 for connecting a reservoir for liquid anesthetic , not shown specifically , and with a closing element 3 , which can be inserted into the filler neck 2 . the filler neck 2 has a cylindrical inner wall 4 with two recesses 5 , 51 ( thread parts ) arranged offset by 180 degrees for inserting two bayonet cams 6 , 61 ( complementary thread parts ), which have a design corresponding thereto and which are arranged at a cylindrical shaft 7 of the closing element 3 . bayonet cam 6 is not shown in fig1 , since it is located opposite the bayonet cam 61 . for greater clarity , the closing element 3 is shown in fig1 rotated by 90 degrees in relation to the position of the recesses 5 , 51 of the filler neck 2 . bayonet grooves 8 , 81 , which are provided with a thread pitch 9 , 91 and have dimensions corresponding to those of the bayonet cams 6 , 61 , are located on the underside of the recesses 5 , 51 . only one of the bayonet grooves , namely , bayonet groove 8 , is shown in fig1 for the sake of greater clarity . the closing element 3 is plugged in a first position 10 in the filler neck 2 by the bayonet cams 6 , 61 being inserted into the recesses 5 , 51 and being brought by a quarter turn , during which the bayonet cams 6 , 61 slide in the bayonet grooves 8 , 81 , into a second position 11 , in which the closing element 3 is blocked in the filler neck 2 . the closing element 3 has on the top side a toggle - like actuating knob 12 with two opposite grip surfaces 13 , as a result of which a rectangular surface 14 is formed on the top side of the actuating knob 12 . the rectangular surface 14 makes it possible for the user to recognize the angular position of the closing element 3 in relation to the filler neck 2 . when the grip surfaces 13 are located in the drawing plane , this corresponds to the first position 10 of the closing element 3 , in which the latter is plugged into the filler neck 2 . the surface is rotated by 90 degrees in relation to the starting position in the second position 11 of the closing element 3 . the thread pitch 9 , 91 of the bayonet grooves 8 , 81 causes the closing element 3 to be screwed into ( axial movement ) the filler neck 2 during the transition ( during rotation of closing element 3 ) from the first position 10 into the second position 11 . together with the bayonet grooves 8 , 81 at the filler neck 2 , the bayonet cams 6 , 61 at the closing element 3 form a bayonet catch 29 . in addition to the filler neck 2 , a sight glass 15 , from which the filling level of the liquid anesthetic in a reservoir , not shown specifically , can be read , is located at the filling device 1 . fig1 a shows as a first addition to fig1 a perspective view of the closing element 3 with the view towards the bayonet cams 6 , 61 . fig1 b shows as a second addition to fig1 a perspective view of the filling device 1 with view from the rear side of the sight glass towards recess 51 and the bayonet groove 81 with the thread pitch 91 . fig2 illustrates the filling device 1 according to fig1 in a longitudinal section . identical components are designated by the same reference numbers as in fig1 . a ring seal 18 , which consists of a sealing material 19 with a v - shaped spring element 20 located on the inside , is located between a front side 16 of the closing element 3 and a contact surface 17 on the underside of the filler neck 2 . fig2 a shows detail “ a ” according to fig2 with an enlarged view of the spring element 20 . when the closing element 3 is rotated from the first position 10 into the second position 11 , the legs 21 of the spring element 20 are pressed against each other and pressed axially due to the thread pitch 9 of the bayonet grooves 8 , as a result of which the closing element 3 is sealed against the filler neck 2 by means of the sealing material 19 . the free space 22 between the legs 21 decreases during the axial pressing of the ring seal 18 . fig3 shows a sectional view of the filling device 1 rotated by 180 degrees relative to fig2 . a contact element in the form of a pin 25 , which is prestressed by a compression spring 24 and is arranged within the bayonet groove 8 , is located in a hole 23 . fig4 shows a sectional view of the filling device 1 with a top view of the pin 25 and the bayonet cams 6 , 61 within the bayonet grooves 8 , 81 . the bayonet grooves 8 , 81 have stop faces 26 , with which the bayonet cams 6 are in contact in the second position 11 of the closing element 3 . step - like depressions 27 , which touch the pin 25 during the transition into the second position 11 , are located on the side of the bayonet cams 6 , 61 facing away from the stop faces 26 . a “ clicking sound ,” which indicates to the user that the blocked position has been reached , is generated by the cooperation of the pin 25 prestressed with the compression spring 24 with one of the depressions 27 , which together form an acoustic signal generator 28 that is a preferred signaling means for acoustic signal generation when the second position is reached . while specific embodiments of the invention have been shown and described in detail to illustrate the application of the principles of the invention , it will be understood that the invention may be embodied otherwise without departing from such principles .
a filling device for an anesthetic dispenser has a closing element that can be inserted into the filler neck and can again be removed from same in a simple manner . a bayonet catch is provided between the closing element and the filler neck combined with a ring seal . the a ring seal can be pressed in an axial direction by axial rotation and has an elastically deformable spring element .