Patent GB-793277-A (GB)
Title: Improvements in and relating to an apparatus for delivering different materials in predetermined proportions
IPC: A61M3/00
Filed: 1956-01-11
Abstract: 793,277. Mixing liquids &c. in predetermined proportions. MAILLARD, J. Jan. 11, 1956 [Jan. 14, 1955; June 3, 1955; June 29, 1955; June 29, 1955; Nov. 23, 1955], No. 1000/56. Class 86 [Also in Group XXVIII] Predetermined proportions of different liquid, viscous of pasty substances are supplied to a mixing cup 72, Fig. 16, from a container 1, Fig. 1, which includes at least two coaxial cylindrical compartments 3, 4 for the substances, respectively, provided with outlet pipes 5, 6 located sideby-side, means such as pistons 15, 16 being provided and adapted to act simultaneously on the several substances so that amounts of the latter proportional to the capacities of the compartments may be ejected through said pipes 5, 6. The pistons 15, 16 are integral and each is fitted at its lower end with a packing, namely an annular packing 20 and a disc-shaped packing 19 respectively; further the piston 16 is provided with an externally-threaded part 17, or the piston 15 with an internallythreaded part, for engagement with a tapped member 18 at the upper end of the wall 2 of the compartment 4. The pipes 5, 6 may be fitted with a cover 7 which is secured to the container by a strip 12 of yielding material and has an inner annular rib 13 adapted forcibly to engage a groove 14 around said pipes. Several modifications are described: For example. Fig. 6 shows a container with an axial and two concentric compartments 4, 3, 21, having outlets 6, 5, 22 with a common cover 23, and three pistons 16, 15, 30, the head 28 of the piston 16 being fitted with an annular packing 24 and the heads of the other pistons each with external and internal annular packings. In another example, Fig. 7, the heads of the pistons 15 16 are not integral with the latter, and each comprises a rigid disc 38 or 39 provided with perforations 40 and adapted to be depressed by the pistons; underneath the discs are disposed independent corrseponding yielding diaphragms 42, 43 provided with fluidtight packings 44, 45 and 46 adapted to contact the walls of the compartments 3. 4. The outlet pipes 5, 6 are surrounded by elastic sleeves 34 which are secured in place by rings 35 and cover the actual outlet ports 36 therefrom, and the container, adjacent the said pipes, is provided with a prop or rod 71 which locates the pipes within the mixing cup 72 and may be used subsequently as a stirrer. Instead of an elastic sleeve 34, which may have an associated spring blade, &c. for urging the sleeve against the outlet in the pipe 5 or 6, the pipes b, 6 are fitted with spring-pressed valves. Fig. 12 shows a 'further construction in which the piston heads are separate from the pistons 15, 16 and which comprises a cylindrical rigid member 54 for the compartment 4 and an annular rigid member 54<SP>1</SP> for the compartment 3, said members having a yielding diaphragm 48 of corresponding shape provided at the lower end of a surrounding reinforcing sleeve or sleeves 47; further, each reinforcing sleeve 47, which is itself surrounded by a sealing sleeve, has at least one tongue or boss 57 for engagement with a slot or groove 60 in the associated contacting surface of the rigid member 54, 54<SP>1</SP>. The outlets 5, 6 are closed by tapped caps 61, and they may be throttled as at 63 to prevent liquid running out prematurely when the caps are removed.