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  2. Hinge - Wikipedia

    en.wikipedia.org/wiki/Hinge

    An ornate brass door hinge A barrel hinge. A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation, with all other translations or rotations prevented; thus a hinge has one degree of freedom.

  3. Disc harrow - Wikipedia

    en.wikipedia.org/wiki/Disc_harrow

    Primary heavy duty disc harrows of 265 to 1,000 pounds (120 to 454 kg) per disc are mainly used to break up virgin land, to chop material/residue, and to incorporate it into the top soil. Lighter secondary disc harrows help completely incorporate residue left by a primary disc harrow, eliminate clumps, and loosen the remaining packed soil.

  4. Cattle grid - Wikipedia

    en.wikipedia.org/wiki/Cattle_grid

    Cattle grid on country road. Cattle grids are usually installed on roads where they cross a fenceline, often at a boundary between public and private lands. [5] They are an alternative to the erection of gates that would need to be opened and closed when a vehicle passes, and are common where roads cross open moorland, rangeland or common land maintained by grazing, but where segregation of ...

  5. Bar gate - Wikipedia

    en.wikipedia.org/wiki/Bar_gate

    Bar gates, especially manually operated ones, are often counterweighted to allow easier manual control. [7] Bar gates are frequently paired end to end or closely offset to block traffic in both directions. Some bar gates also have a second arm which hangs 30 to 40 cm below the upper arm when lowered to increase approach visibility.

  6. Electric gate - Wikipedia

    en.wikipedia.org/wiki/Electric_gate

    Electric gates alone, however solid and imposing they may be, cannot guarantee a completely secure environment electric locks, are often needed to boost the locking effectiveness of the gate motors. Electric gates are recommended to be used in combination with other security features to install a full security system.

  7. Four-quadrant gate - Wikipedia

    en.wikipedia.org/wiki/Four-quadrant_gate

    Many people consider four-quadrant gates to be safer than two-quadrant gates because they prevent drivers from illegally and dangerously driving their vehicles around lowered gates, in an attempt to pass before the train does. However, these gates are only safer if there is a way of ensuring that the crossing is clear before clearing the train ...

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