Patent GB-436417-A (GB)
Title: Improvements in or relating to apparatus for mixing two fluids
IPC: F16K11/18
Filed: 1934-10-09
Abstract: 436,417. Mixing-valves. ETABLISSEMENTS JACOB-DELAFON COMPAGNIE CERAMIQUE DE POUILLYSUR - SAONE ET BELVOYE, 14, Quai de la RÔpÚe, Paris. Oct. 9, 1934, No. 28909. Convention date, Oct. 11, 1933. [Class 135] In apparatus for mixing two fluids, a single control member capable of two movements A, B, acts through an irreversible controlling mechanism such as a cam to control only two valves 4<1>, 4<2>, one of the movements A acting in the same direction on the valves so as to regulate the total flow of the fluids, and the other movement B acting in an inverse direction on the valves so as to regulate the proportions of the mixed fluids. The two movements may comprise two rotational or two translatory movements or a rotational and a translatory movement. In all cases a common outlet x is provided for the two valves. Fig. 1 diagrammatically shows a form in which the amplitudes of the two movements A, B are independent of one another. The regulating member R which is capable of rotary and sliding movement comprises an oblique cone having one generating line G coincident with the axis T. With this arrangement, the following operations can be performed. (a) The member R may be moved to the position R<0> by movement A after which the movement B fails to effect any flow of either fluid. (b) By movement B, the generating line G may be arranged opposite either of the valve stems so that the movement A subsequently changes the flow of one of the fluids from zero to some maximum value whilst the flow of the other fluid remains at zero throughout. (c) With the member R in the position shown in full lines, Fig. 1, the movement B increases the flow of one fluid from zero to a maximum value and simultaneously decreases that of the other fluid from a maximum value to zero, the total flow remaining the same throughout. (d) When the member R has been turned (movement B) to some position in which the generating line G is not in contact with either valve stem, movement A produces a change in the total flow without changing the proportions of the two fluids. In the practical embodiment shown in Fig. 3, a universally mounted lever 16 carries at its end a cam 15 engaging the levers 9<1>, 92 which operate the valves. Sections s<1>, s<2>, s<3>, Fig. 6, through the cam decrease in curvative outwardly from a to b or c. Its outer edges have zero curvature, i.e. they are straight lines. The movement A is about a horizontal axis through the pivot o in the plane of the figure. Another form, Fig. 10, has an oblique cone cam 24 on a rod 20 which can turn about its own axis (movement B) and bodily about pivots on which the bearing of the rod is mounted (movement A). In a similar form with an oblique cone cam, the rod has a sliding movement as in Fig. 1 but operates the valves through bell-cranks. The axis of the rod is in this case normal to the axial plane of the valves but by using obtuse-angled bell-cranks the rod may be arranged parallel to the valve stems. The invention is applicable to wash hand basins and shower installations, where a single fluid is used at two different temperatures. The regulating member may in all cases be operated by a hand knob 30. Movement amplifying devices such as gears, chains, &c. may be employed in the case of screw down valves and in one such device, one arm of the bell-crank 91 or 9<2> is formed as a segmental gear meshing with a spur gear on the screwed valve spindle which is returned to its initial position by a torsion spring. By using valve spindles with quick pitch threads, such amplifying devices may be dispensed with. The Specification as open to inspection under Sect. 91 comprises also the following subject-matter. Fig. 3 (Cancelled) shows diagrammatically a construction with a T-shaped control lever R in which the amplitudes of the two movements A, B are interdependent. Thus if the valves 4<1>, 4<2> are both closed by movement A, movement B cannot be accomplished. Another construction comprises a universally-mounted lever a cylindrical enlargement on which is gripped by bell-cranks in a manner similar to that in Fig. 10. This form is shown applied to a wash-hand basin and a shower installation and in it, the knob 30 may be replaced by a pedal capable of lateral as well as vertical movement. In a further construction, Fig. 23 (Cancelled), a universallymounted three arm regulating lever 7 operates the valves directly by means of cams 611, 61<2>. This subject-matter does not appear in the Specification as accepted.