Patent GB-629746-A (GB)
Title: Milking machine pulsator
IPC: A01J5/10
Filed: 1947-11-14
Abstract: 629,746. Milking machine pulsators. RITE-WAY PRODUCTS CO. Nov. 14, 1947, No. 30352. Convention date, Jan. 17. '[Class 84] A milking machine pulsator comprises a pulsator body in the form of a block with a flat upper surface passageways therein terminating in ports at the said surface, a valve slidable on the block and adapted to interconnect selected ports in a desired sequence and means for moving the valve comprising cylinder bores formed in said valve with which bores coact pistons mounted on the block. Pulsator block 1, Fig. 2, is provided with nipple 7 which is connected to a source of vacuum. Nipples 12 and 13, Fig. 1, are connected to a milking machine claw in a known manner. Pulsation valve 60 and timing valve 61, Figs. 1, and 2, are positioned on the flat upper surface 5 of block 1. Each valve has a flat base in contact with surface 5 and is provided with two coaxial bores 82, 83, Fig. 1, in which act pistons 90 mounted rotatably on posts 55 which are erected perpen-, dicularly to surface 5. The block 1 is pro-, vided with drilled horizontal passages 21, 22, 23 and 24, Figs. 3 and 4, blocked by plugs 25 at the side of the block. These passages are connected with ports in the surface 5 and with recesses 63, 64, 65, 66, 67, 68 and 77, 78, 79, 80, 81 in the bases of valves 60 and 61 respectively, Figs. 6 and 10. With the parts in the position shown in Figs. 1 and 2. vacuum is applied via nipple 7 and chamber 3, Fig. 5, through passage 16 and recess 63 to passages 14 and nipple 12, Figs. 1 and 4. At this time passages 15 are overlaid by recess 64 in the pulsation valve, which, being open to atmosphere, applies atmospheric pressure to nipple 13. At the same time vacuum is applied from chamber 3 by bore 43, Fig. 5, through the space between the threads of regulating screw 45 and the threads of the bore 41, by passage 40 to port 39. This port is overlaid by recess 66 in the pulsation valve which extends to port 33, Fig. 1. Vacuum is thus applied by port 33 to passage 24 and port 34 which is in turn connected by recess 80 in the base of the timing valve to the interior of cylinder 83. At the same time the interconnecting ports, passages and recesses apply atmospheric pressure to opposite cylinder 82 of the timing valve. Timing valve is thus caused to move in a downward direction as seen in Fig. 1, its rate of movement being governed by the rate of extraction of air past the threads of regulating screw 45, Fig. 5. At the limit of movement of the timing valve, the interconnections of ports, passageways and recesses causes a movement of pulsation valve 60 to its uppermost position as seen in Fig. 1 and the vacuum and atmospheric pressure connections to nipples 12 and 13 are reversed. This movement causes the return of the timing valve to its original position: thus the period of movement of the valves and hence the period of alternation of supply of vacuum. and atmospheric pressure to nipples 12 and 13 is controlled by the resistance to air flow in the restricted spiral passage between the threads of screw 45 and bore 41 and this may be varied by manual adjustment of the position of the screw in the bore 41.