A grapple is a hook or

claw A claw is a curved, pointed appendage found at the end of a toe or finger in most amniotes (mammals, reptiles, birds). Some invertebrates such as beetles and spiders have somewhat similar fine, hooked structures at the end of the leg or Arthro ...

used to catch or hold something. A ship's

anchor An anchor is a device, normally made of metal, used to secure a vessel to the bed of a body of water to prevent the craft from drifting due to wind or current. The word derives from Latin ', which itself comes from the Greek (). Anch ...

is a type of grapple, especially the "grapnel" anchor. MS812-3

A throwing grapple, kaginawa (or " grappling hook" ) is a multi-pronged hook that is tied to a rope and thrown/launched to catch a grip, as on a parapet or branch of a tree.War in the Streets by Michael Dewar (Author)Publisher. David & Charles; Publication date. 30 Jan. 1992; It may also be used in a boat to "drag" the bottom of a waterway to hook debris or to find missing objects. Skid steer grapple

logging Logging is the process of cutting, processing, and moving trees to a location for transport. It may include skidder, skidding, on-site processing, and loading of trees or trunk (botany), logs onto logging truck, trucksengineering vehicle Heavy equipment, heavy machinery, earthmovers, construction vehicles, or construction equipment, refers to heavy-duty vehicles specially designed to execute construction tasks, most frequently involving earthwork operations or other large con ...

s, a grapple is a hydraulically powered claw with two or more opposing

lever A lever is a simple machine consisting of a beam (structure), beam or rigid rod pivoted at a fixed hinge, or '':wikt:fulcrum, fulcrum''. A lever is a rigid body capable of rotating on a point on itself. On the basis of the locations of fulcrum, l ...

s that pinch a log or other materials, usually to

lift Lift or LIFT may refer to: Physical devices * Elevator, or lift, a device used for raising and lowering people or goods ** Paternoster lift, a type of lift using a continuous chain of cars which do not stop ** Patient lift, or Hoyer lift, mobile ...

or drag them. The logging grapple used in swing yarding is not moved by hydraulics but by cables. To open and close the tongs of the grapple, two cables are used. One is tensioned and the other is slacked off to move the tongs. A third cable goes back to the tail hold then to the yarder. This third cable is used to pull the grapple out into the setting and to create tension for lifting the grapple in the air. A grapple can be mounted to a

tractor A tractor is an engineering vehicle specifically designed to deliver a high tractive effort (or torque) at slow speeds, for the purposes of hauling a Trailer (vehicle), trailer or machinery such as that used in agriculture, mining or constructio ...

excavator Excavators are heavy equipment (construction), heavy construction equipment primarily consisting of a backhoe, boom, dipper (or stick), Bucket (machine part), bucket, and cab on a rotating platform known as the "house". The modern excavator's ...

with a movable arm that may lift, extend/retract, and move side-to-side (pivot or rotate). Some machines also have a separate control for rotating the grapple. Simpler grapple machines consist of a hydraulically liftable fork, rake ("grapple rake"), or bucket and a movable, opposing "thumb" (one or more hooks or levers) that enclose and grip materials for lifting or dragging. A "demolition bucket" or "multi-purpose bucket" on a loader may also operate as a grapple whereby the bottom and rear side of the bucket are hinged and can be forced apart or together with

hydraulic Hydraulics () is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counterpart of pneumatics, which concer ...

cylinders. A lifting grapple is a type of hardware that can be attached to most large, heavy, or bulky objects to provide a feature on the item to which material handling equipment can attach. Lifting grapples sometimes double as tie downs, allowing heavy items to be held firmly in place by providing a point to which ropes or chains can be attached to the item to hold it in place. The term ''grapple'' is also used in the

surfboard A surfboard is a narrow plank used in surfing. Surfboards are relatively light, but are strong enough to support an individual standing on them while riding an ocean wave. They were invented in ancient Hawaii, where they were known as ''papa hee ...

industry to refer to a leash connector.

References

{{DEFAULTSORT:Grapple (Tool) Log transport Tools fr:Grappin ml:പാതാളക്കരണ്ടി

See also

References