The Parker Automatic Water Gate.
The accompanying illustrations represent an automatic sluiceway and flood gates for dams controlled by the Parker Automatic Water Gate Company of Menomonie, Wis.
The cut, figure No. 1, shows the gate elevated or closed, while in figure . No. 2 it is shown depressed or opened. In figure 1 A1 A1 is the bed of the sluiceway. A2 cribbing forming walls or sides, may be made of timber, stone or other material. Across the down stream end of the bed A1 a roller B1 is journaled in suitable bearings, B2, secured to bed A1, and to this roller the gate proper,
C1, is attached, which is constructed of plank or timbers bolted firmly to • gether, and further strengthened by cross timbers upon the ur.der side. B3 is another roller some distance in the rear of B1 and similarly journaled to the bed. The rollers may be made of either wood or iron. The free end, ib1 of the gate, C1, is connected to roller B3 by jointed sections Cs C3—
.the part C2 being joined to the gate C1 at b-j and the part C3, joined to the roller B3, while the two parts C2 C3 are joined at d1. When the gate is depressed, as shown in Fig. 2, C2 C3 will fold in beneath the gate, and when the gate is elevated, as in Fig. 1, the two sections will form the back or rear wall to the space beneath the gate.
A flume is formed in a space between the main walls, into which the water will freely flow from the upstream, and which is provided with a “ stop wall,” as shown by dotted lines As, to prevent the water flowing entirely through. D’ is the “feed port,” and D2 its valve or gate above the stop wall, shown open in Fig. 1, and closed in Fig 2. D3 is the “ Discharge port,” and D4 its valve below the stop wall, shown closed in P’ig. I, and open in Fig. 2. The flume is connected with the space beneath the gate by the feed port D1, above the stop wall, supplied with a valve D2, by which the flow of water is shut off as required. This feed port opens into the sluiceway beneath the gate Ci, and folding sec. tions C2 C3, and is not uncovered by change of position of the gate when being elevated or depressed. The flume may also be constructed of a separate conduit or tube, if desired, and the entrance will be guarded by a rack to prevent drift and foreign matter likely to clog the valves from entering. The valves D2 D4 are adapted to be opened and closed from the top of the cribbing by a gear movement, which runs one valve upward while it runs the other downward, thereby opening one while closing the other. These “ valves ” may be constructed in many different ways, and their lbcation, number and manner of manipulation Will be determined by the requirements of the dam in which they are placed.
In Fig: 2 the gate is shown depressed, with the feed port D1 closed, and discharge port D3 open, so that the water is free to flow out from beneath the gate through D3, below the stop wall, but cannot enter beneath it from the flume. When it is desired to elevate the gate the positions of the valves I)2 D4 are reversed by simply turning the hand wheel e,. which will open D2 and close DJ, permitting the water to flow beneath the gate, but not permitting it to escape therefrom. The difference in altitude between the water at the upstream end and at the point where it passes beneath the gate creates a pressure beneath the gate, and thus forces it upward and holds it elevated so long as the valve D4 is kept closed and the valve D2 kept open. It will be plain to persons versed in hydraulics, that the moment the space lieneath the gate is filled with water the pressure is changed from an outside pressure downward to an upward pressure beneath the gate. When the gate is to be lowered again, the position of the valves D2 Id4 are again reversed, the discharge valve I)4 being opened to permit the water beneath the gate to flow out and down stream, and the feed valve D2 being closed to prevent any more water flowing in beneath the gate ; the outflowing of the water removes the pressure of the water from beneath the gate and causes the pressure of the water through the port M to act upon the double sections C2 C3, forcing the gate into the position shown in Fig. 2, as fast as the water escapes by the port D„
The gate can be supported at any required point of elevation by adjusting the valves D2 D4 partially open or partially closed, so as to permit a greater or lesser quantity of water to pass through the ports. The position of the gate C1 may thus be perfectly and instantly determined by merely turning the hand wheel, an operation which is easily performed by a boy ten years of age. This is a very important feature of the invention; as it avoids entirely the necessity of employing any extra mechanism for supporting the gate at any point desired. The jointed sections C2 C* form an essential part of the gate proper, being the only means by which the main section C* can be depressed from a perpendicular, or from an angle above about thirty degrees from the horizontal, which is effected, ds before stated, by drawing the water front beneath the gale through port D* when the port D1 is closed, and thereby decreasing the pressure beneath the gate and allowing the pressure of the water entering through the port M to act upon the jointed section and fold them down into the position shown in Fig 2; The bed A1 of the sluiceway is formed with a depression where the gate C1 C1 C3 is placed, so that when the gate is lowered, as in Fig. 2, it covers this depression and forms a part of the bed of the sluiceway, By this means the presence of the gate does not materially affect the sluiceway or lessen its size.
G1 is an “idler section” jointed by one end to the free end b1 of the gate C1, and resting its lower end upon the bed of the sluiceway, or on straps attached to the bed. The idler section moves with the gate C‘ as it rises and falls, to cover the folding sections and prevent drift wood or other obstructions from getting between the folding sections when the gate is depressed, and also to assist logs, ice and drift wood in passing over the gate. The lower edge of the idler section is armed with a chiselpointed metal toe plate, which is at all times in close contact with the bed. Sand boxes K are attached to the idler near the toe plate to afford sufficient weight to keep the point on the bed. The idler section is also provided with a series of doors L, opening outward to provide a more ready means of exit for the water beneath the section, so that when the gate is lowered the water between it and the jointed sections can pass directly into the sluiceway and not be required to pass back into the flume against the pressure of the water therein. These doors will be of boiler iron or wood, with weights attached so they will remain dosed when the gate is elevated, or being elevated, and also when the gale is at rest at any point. M is a port or opening connecting the space beneath the idler section G1 with the flume, so that the water is free to flow beneath the idler section and preserve the equilibrium and prevent any variation in the pressure on the two sides of the section. The port M has no valve, but is left open at all times, so that the water is free to flow in and out, according as the gate attachments arc raised or lowered.
This makes a very simple and efficient sluiceway and floodgate and does not require any mechanism for elevating or depressing it, but is entirely automatic in its action. It is entirely submerged when depressed, and is exposed only when the water is lower than its upper end, i, which rarely occurs. The gate is thus protected by the water and is not exposed to the changes from wet to dry, or with a (wrtion above the water and a portion below the water, which always has a bad effect upon the durability of gates. The gate may be made of any width or height to adapt it to any size dam or to wide or narrow streams. The cribbing may be supplied with one or more of the flumes, if required ; but generally only one will be required, and one or more of the feed or discharge valves may be employed as required. The spaces between the gate O and the walls of the sluiceway are made tight by a flexible “stopwater, “which is made of rubber belting, or similar material, and applied between the gate and sluice walls, where it is accessible when repairs are necessary.
The Parker automatic gates are also made with a short idler, the toe of which strikes just below the joint in the folds. The lower section of the fold is made somewhat longer and the toe slides on strips on the lower section, and, when depressed, does not extend beyond it. This method of construction shortens the bed of the dam and is preferred by some and will, perhaps, be adopted in most cases in future. Since the recent floods much interest has been shown in the Parker gate, especially by the owners of dams which were carried away, who are seeking for some safe device to use when rebuilding these structures. The gates are in successful operation in a number of places.