Front positioning rail for milking parlour

Abstract: A front positioning rail (22) for a diagonal milking parlour, in which cows stand alongside one another at an angle to the curb, moves between a milking position and a release position. In the milking position the rail (22) restrains the cows with their heads projecting over the rail (22) and with their briskets contacting the rail. In this rail assembly an elongated rail member (28) extends laterally, and has a proximal generally vertical side and a horizontal upper edge. A plurality of vertical positioning loops (30) rise above the upper edge and spaced at a predetermined interval to define head positions for the cows. The loops preferably have one vertical side (46) and one sloping side (44), to discourage cows from turning around in the parlour, but permitting them to slide down if they enter a position ahead of an unoccupied space. An air cylinder (36) or other mechanism moves the rail member between the milking position and the release position so that said cows can exit the parlour.The rail member can have an upper tapered portion (40) that slopes distally upwards to conform generally with the cow's brisket. The rail member can index to bring the hind ends of the cows against a back rail or splash shield (20).

Description: This invention relates in general to cattle stalls, e.g., milking parlours, and is more particularly directed to a front positioning rail for a diagonal milking parlour. The invention is more particularly concerned with an improved rail that assists the cows in self-positioning, and accommodates cows of various lengths. The invention is further concerned with a brisket rail which permits indexing, or bringing the rear legs of the cattle against the back wall or splash shield of the parlour, and which further moves or lifts away to permit the cows to exit the parlour after milking. A milking parlour generally consists of an array of individual stalls, each being designed to hold a single cow as she is being milked. The cows are walked into the parlour through an entry gate, and then each cow is directed to her respective stall. There an attendant washes her udders, attaches a milking unit, monitors and attends to the milking operation, disconnects the milking unit, and releases the cows so another group of cows can be milked. In parlours of this type, the cows proceed in single file through the entry gate into the parlour, and can exit, either in the same fashion through an exit gate at the far end, or in gang fashion out the side of the parlour. Various schemes for milking parlours are known, including herringbone, diagonal, and parallel or side-by-side. A parallel milking parlour operation is described in U.S. Patents Nos. 5,230,299 and 5,285,746. A relatively new "diagonal" design in milking parlours is a hybrid of the parallel and herringbone configurations. These parlours place the cows at an angle of 50 to 70 degrees relative to the curb line. In a conventional herringbone parlour, the cow is at 30 degrees to 45 degrees to the curb line, with a spacing of 90 cm to 112 cm between cows along the curb line. By contrast, the parallel or side-by-side parlour places the cows at 90 degrees, and at a spacing of 68 cm to 64 cm along the curb line, but requires the cows to be milked between their hind legs. In the hybrid diagonal design, the cows are placed at a typical angle of 50 to 60 degrees, with a spacing between cows of 67 cm. A steeper angle of 70 degrees and a spacing of only 68 cm along the curb can be achieved. An example of an existing diagonal parlour design is the ParaBone® parlour, sold by Germania Dairy Automation, Inc. An example of brisket bar apparatus for aligning cows in both a herringbone and a diagonal parlour, and for releasing them after milking, is described in U.S. Patent No. 4,951,608. Sequencing gates, which are required in parallel or side-by-side parlours, are omitted in the diagonal parlour. This simplifies installation, and also aids in cow entry, as it creates a wider lane for the cows. However, as the angle of the parlour increases towards 90 degrees, there is a problem of cows turning around. At 90 degrees or other high angle, the cows can move left or right where there are no sequencing gates. In the standard parallel parlour, the sequencing gates serve the purposes of restricting cows to right angle positioning, and act as a barrier to cows moving away from their positions. On the other extreme, in the herringbone design, i.e., at angles of 30 degrees, the cows do not have space to turn around. However, as the angle increases, e.g., at 55 degrees to 70 degrees, cows have enough space to turn around if they are disturbed or "spooked." Another shortcoming of the diagonal parlour -- when a conventional front rail is used -- is that of defining the proper milking or stall positioning for the cows. Where there is no definite position for the cow to take along the front positioning rail, overloading or underloading of the parlour frequently occurs. Cows can "bunch up" or fit loose along the rail. This is of course a problem because there are a given number of milking units, e.g., eight units, for a given parlour. Underloading means that the parlour is not used to capacity, and overloading means that at least one cow must be milked with a portable milking unit, which also decreases parlour efficiency. At the rear of the parlour, the splash or manure shield can be of a serpentine or S-shaped configuration, but this is on the side away from the cow's head. The cows cannot easily, and often do not follow the S configuration as to where they place their hind ends. Of course, where the parlour has a straight splash shield, there is nothing to define where the cow's hind end should be placed. Since the number of milking units and the automated equipment is fixed, and because these units are disposed at the rear of the stalls for a given number of cows and at a relatively fixcd position, cows placed erratically in the parlour -- or extra cows -- present a hindrance to efficient milking. A further shortcoming of the standard or conventional front rail is the manner that it indexes the cows, i.e., brings them to the proper milking position with their hind legs against the back rail or splash shield. Where the front rail is movable, the rail is in a forward position when the cows enter the parlour. After the cows have moved into the parlour, the front rail assembly can move back towards the cows, e.g., by air cylinder operation. This shortens the distance from the front rail to the rear splash shield. Cows can compensate for this in two ways, i.e., either by backing up against the splash shield (the desirable action) or by sliding forward along the front rail and changing angle (which is undesirable). When the cows only move along the front rail, the cows will be in a poorer milking position, that is, a worse position for access by the operator. In longer cows, some change of angle is acceptable as long as they have first moved their hind legs against the splash shield. This action actually provides the longer cow with more space and does not "trap" her in. Also, when the longer cows turn slightly, the front rail can continue to come back and index the shorter cows as well as the longer cows against the splash shield. In an ideal front positioning rail assembly, some limited sliding along the rail is desirable for the longer cows, but should be discouraged until the cows are all the way back against the splash shield. Accordingly, it is an object of this invention to provide a front positioning rail for a diagonal milking parlour in which the cattle are oriented at an angle of up to about 70 degrees, where the rail defines the front position for the cows, and where the rail discourages cows from turning around, even without sequencing gates. It is another object to provide a front positioning rail for a milking parlour which discourages the cows from changing angle, i.e., sliding down, as the rail moves back to index the cows, but which does permit some angling of the longer cows so that all cows will be lined up evenly (indexed) in the most rearward position against the splash shield. It is a further object to provide a milking parlour where the cows can be spaced closely (i.e., at spacing on the order of about 68 cm (27 inches) --) but without sequencing gates. In accordance with an aspect of the present invention, a front positioning rail is constructed for a milking parlour in which cows stand alongside one another. The front positioning rail moves between a milking position and a release position. In the milking position, the rail restrains the cows with their heads projecting over the rail and with the rail contacting briskets of the cows above their front legs and below their heads. The front positioning rail comprises an elongated rail member that extends laterally, across the front of the parlour and has a proximal generally vertical side and a generally horizontal upper edge. In order to achieve at least some of the above objects, a plurality of vertical positioning loops rise above the upper edge of the rail member and define head positions for the cows. The positioning loops have left and right edges, and are spaced from one another at a predetermined interval. In a preferred construction the rail member proximal side has an upper tapered portion that slopes distally upwards so as to conform generally with the shape of a cow's brisket. Another design could be a round or half-round tube of approximately 7.5 to 15 cm (three inches to six inches) in diameter. The positioning loops can have a generally triangular shape, so that one of its sides rises substantially vertically and the other side slopes diagonally. The loops preferably have a sheet metal gusset affixed inside the loops to prevent cows from placing their hooves through the loop. Preferably, the rail assembly swings up about an overhead pivot above the rail to release the cows after milking. In that case there are swing-up support members supporting the rail member. The rail is coupled by means of a journal member, e.g., a sleeve, on the overhead pivot. The journal member can include means permitting proximal-distal play of several inches when the rail is in the milking position, so as to achieve gravity indexing. The rail support members can comprise a plurality of U-shaped members connecting the journal member or members and the front rail member. The above and many other objects, features, and advantages of this invention will become apparent from the ensuing detailed description of a preferred embodiment, which should be read in connection with the accompanying drawings, in which: Fig. 1 is an end view showing a diagonal milking parlour which includes a front positioning rail according to an embodiment of this invention. Fig. 1A is a cross-sectional view taken at 1A-1A of Fig. 2. Fig. 2. is a perspective view of the diagonal milking according to this embodiment. Fig. 3 is a partial perspective view showing the front positioning rail in its elevated or release position. With reference now to the drawings, and initially to Fig. 1, a milking parlour 10 (only a portion of which is illustrated) includes a cow stand or platform 12 that is formed of poured concrete, with a curb 14 at one edge, here shown at the left. The curb 14 is disposed adjacent a milking pit, which is the work station for the milker or operator. Vertical metal beams or standards 16 rise from the platform 12 and support overhead support bars 18. A butt rail or splash shield 20 traverses the parlour 10 above the curb 14, and extends the length of the cow stand 12. This defines the back of the cow positions on the platform, i.e., with the cows standing with their rear or hind ends against the splash shield 20. A swing-up front rail assembly 22 is disposed distally, i.e., to the right in this Drawing, to define the front of the cow positions. Support members 24 are suspended from the overhead support bars 18 and these support an overhead transverse pivot bar 26. A rail member 28 for restraining the cows has a series of positioning loops 30 that project upwards from an upper edge of the rail member 28. A plurality of generally C-shaped support tubes 32 are affixed at their lower ends to the rail member 28 and at upper ends to the pivot bar 26. The upper ends are fitted into sleeves 34 that overfit the pivot bar 26, as generally shown in Fig. 1A. These sleeves 34 can permit a limited amount of play to permit gravity indexing, as will be discussed later. An air cylinder 36 is also fitted to the overhead support bars 18, and has its rod coupled to a swing arm 38 for rotating the front rail assembly 22. With the cylinder in the withdrawn position, as shown in solid lines, the front positioning rail assembly is in its descended or milking position. In this position, the rail 28 restrains the cows on the platform so that they can be milked. When the cylinder 36 is actuated to extend the rod, as shown in ghost, the positioning rail assembly 22 is raised to a release position, so that after milking the cows can leave the platform 12 and proceed out of the parlour 10. The front positioning rail assembly 22 is then lowered again before the next group of cows to be milked enters the parlour. In Fig. 1 a cow C is shown in ghost lines to illustrate the position of the cow for milking. The cow C stands at an angle to the curb 14 and to the rail 28, with her rear end against the butt rail 20 and with her head projecting over the top of the brisket rail 28. As shown here, the rail member 28 has a somewhat chamfered cross section, with a sloping surface 40 that meets the brisket of the cow C, that is, the portion of the front of the cow above her front legs and below her neck. This sloping surface 40 generally conforms to the shape of a cow's brisket. As shown in Fig. 2, the positioning loops 30 are somewhat triangular in shape, and are positioned so that there is a space 42 of about 15 cm (six inches) between the loops 30. Each loop has a sloping side 44 and a vertical side 46, the vertical side being on the side away from the cow entry. A sheet metal gusset 48 fills in the inside of each loop 30 to prevent cows from attempting to place their front hooves through the loops. In an alternative embodiment (not shown) the front positioning rail can employ non-tapered positioners or loops. This alternative will achieve similar benefits of positioning laterally, although the preferred embodiment also achieves indexing of cows of mixed length. As just mentioned, there is a 15 cm (six inch) spacing 42 between the loops 30. The cows C preferably place their heads in this position, that is, directly on top of the rail member 28, as this is the most comfortable position for the cow. In practice, this distance is about 86 cm (thirty-four inches) above the platform 12. As the cows move out of this position to forward, the forward-inclined loop sloping side 44 impacts the cow C in the throat area. This permits, but discourages, the cow from sliding forward. This causes some discomfort that intensifies as she slides down the rail. This feature encourages the cow first to back up against the splash shield 20, and then slide down the rail 28 only as necessary. The larger cows, and those that must move down the rail after they are backed up against the splash shield, are generally also taller. Thus, these cows will be less hindered by the inclining loop 30. On the other hand, the smaller cows are generally shorter, and subsequently are hampered more by the positioning loop 30 as they move forward. Hence the shorter cows will be urged back against the splash shield 20. For a given location of the rail member 28, the larger cows and the smaller cows will all be positioned rearward against the splash shield. The smaller, i.e., shorter cows will be positioned at the lower part of the sloping side 44 of the positioning loop, while the larger or longer cows will be in a more forward, or higher, location of the sloping side 44 of the respective positioning loop 30. This means that the longer and shorter cows will be at slightly different angles, but all cows will be in the most rearward position against the splash shield with optimum access for milking. Additionally, the triangular shape of the positioning loops 30 discourages the cows from turning around, because to do so means they would have to lift their heads up sharply approximately 30 cm (twelve inches), i.e., to a height of about 116 cm (forty-six inches). This tends to be uncomfortable for the cow and discourages her from turning around towards the entry direction. However, she can be coaxed forward, albeit with a slight amount of discomfort, if she drops her head down into a position before moving to the most forward available position when entering the parlour. When the cows are marched into the parlour 10, the rail member 28 can be moved gently back, as necessary, to index the cows and move their rear ends to the splash shield 20 for milking. This can be done employing a dual-action air cylinder, or employing a gravity indexing system, similar to what is described in my earlier U.S. Patent No. 5,285,746, issued February 15, 1994. The cows will space themselves generally evenly at the rear end in positions that correspond to the pre-positioned automatic milking equipment. The cows adjust their angles and head positions as just described. The attendant or operator can then clean the cows' udders and attach the milking equipment, accessing from the side or the rear of the cow. When the milking is complete, the attendant removes the milking equipment, and actuate the cylinder 36. This raises the front positioning rail assembly 22 to the raised or release position, as generally shown in Fig. 3, and the cows exit beneath the raised front rail member 28. After this, the assembly 22 is lowered to the descended position, and the next group of cows to be milked enters the parlour 10, where the milking sequence is repeated. For gravity indexing, the sleeves 34 can permit the rail assembly 22 to have a proximal-distal play of several inches when the rail is in the lowered or milking position. Gravity brings the rail gently back against the cows to urge them against the splash shield. In the embodiment described and illustrated here, the cows can be positioned at an angle of up to about 70 degrees. The cows are discouraged or prevented from turning around in the parlour, even in the absence of sequencing gates or similar devices. The front positioning rail member 28 defines the front position for the cows and the positioning loops 30 define the head positions for optimal and efficient spacing of the cows. At the same time, the shape of the loops 30 permits the larger cows to move up slightly so that both the long and short cows are properly indexed against the splash shield, for best access to the udders. The loops 30 discourage the cows from changing angle until the cows have been backed up against the splash shield.

Claims: A front positioning rail for a milking parlour in which cows stand alongside one another, said front positioning rail being movable between a milking position and a release position, wherein in the milking position the rail restrains said cows with their heads projecting over the rail and with the rail contacting briskets of said cows above their front legs and below their heads, wherein an elongated rail member (28) extends laterally, with a proximal generally vertical side and a generally horizontal upper edge, and the rail member (28) is movable between said milking position and said release position so that said cows can exit said parlour; characterized in that a plurality of vertical positioning loops (30) rise above the upper edge and define head positions for said cows between successive ones of said loops, wherein the positioning loops have left and right edges (44, 46), and are spaced from one another at a predetermined interval (42) with said intervals (42) between loops defining said head positions. The front positioning rail of Claim 1 further characterized in that the rail member proximal side has an upper tapered portion (40) that slopes distally upwards so as to conform generally to the shape of a cow's brisket. The front positioning rail of Claim 1 or 2 further characterized in that the loops (30) each have at least one of said left and right sides (44) sloping diagonally upward. The front positioning rail of Claim 1, 2, or 3 further characterized in that the loops each have one of said left and right sides (46) rising substantially vertically and the other of said left and right sides (44) sloping diagonally upward. The front positioning rail of any of the preceeding Claims, further characterized in that the loops (30) each include a gusset (48) affixed on an inside of the loop to prevent cows from placing their hooves through the loop. The front positioning rail of any of the preceeding Claims, further characterized in that an overhead pivot (34) for the rail is positioned above said rail and a swing-up support member (32) supports the rail member on said overhead pivot. The front positioning rail of Claim 6 further characterized in that said overhead pivot (34) permits proximal-distal play of several centimeters when the rail is in the milking position. The front positioning rail of Claim 6 further characterized in that said support member includes a plurality of U-shaped members (32) connecting the overhead pivot and the rail member. A milking parlour for milking dairy animals including a cow platform (12) on which said animals are positioned for milking between a splash shield (20) and a front positioning rail (22), said rail being movable between a milking position and a release position, wherein, in the milking position the rail restrains the animals with their heads projecting over the rail and with the rail contacting briskets of the animals above their front legs and below their heads, in which an elongated rail member (28) extends laterally, and the rail has a proximal generally vertical side and a generally horizontal upper edge, and in which the rail member (28) is movable between said milking position and said release position so that said animals can exit said cow stand; and characterized in that a plurality of vertical positioning loops (30) rise above said upper edge of said rail member (28) and define head positions for said cows between successive ones of said loops, said positioning loops having left and right edges, and being spaced from one another at a predetermined interval. The milking parlour of Claim 9 further characterized in that said loops (30) each have one of said left and right sides (46) rising substantially vertically and the other of said left and right sides (44) sloping diagonally upward. The milking parlour of Claim 9 or 10, further characterized in that said loops (30) are generally triangular in shape.

Inventors: MOREAU JOSEPH R, MOREAU, JOSEPH, R.
Applicants: NORBCO INC, NORBCO INC.
Application year: 1997
Main classification: A01K1
IPC codes: A01J5, A01K1, A01J7