Piggyback (transportation)

Piggyback ( v. niederdt. Hucken wear back back ) generally carrying a person on the back or shoulders of another. This is used to transport or increase the position of the carried.

Two variants of the piggyback wearing are used:

• Wherein the one of the supported hanging with its breast at the back of the wearer; in order to obtain a better grip, it loops usually his arms around his shoulders and his legs around the waist of the wearer.
• Wherein the other of the supported sitting on the shoulders of the wearer and has a depending leg stretched on either side of the neck to the front, so that it hangs down on the breast. This variant requires a better sense of balance of the supported so - especially when small children are supported - the carrier for security often holds the legs of the supported.

Etymology

The word " piggyback " is used since the 18th century. Its etymological origin is not fully understood. During the first part of word in the late Middle High German Hucke, which refers to the bundle of the peddler, and derived from this verb hucken ( " bear a burden " ) is expected to decline, it is questionable whether the second part of word in the Low German back ( " back " ) or the Middle High German pack ( also " bundle " ) back.

Transferred meanings

The term is also used in piggyback fashion transmitted whenever an object on the " back " or the back of the other is being transported. From various technical concepts have emerged:

• As a piggyback transport a form of combined transport for members and articulated trucks is framed with ships ( Ro-Ro method ) or trains ( rolling road ) called.
• Piggyback towing called transportation of an aircraft on the back of the other aircraft ( for example, see the short Mayo composite). Spacecraft also be transported in this way. Falsely also the transport plane in tow mistletoe is sometimes referred to as the " piggybacked "; Here, however, the towed aircraft is not mounted on the rear, but at the abdominal side of the carrier aircraft.
• In politics, the piggyback method refers to a way to get around by exploiting the basic mandate clause a restrictive clause.
• The piggy-back system on contact lenses is a combination of a soft and a hard contact lens worn for example, to correct the eye disease keratoconus over each other.

The English term piggy -back for " piggyback " was acquired in specialized languages ​​of different areas in German:

• Microcontrollers are referred to as piggy-back version if the program memory is attached to the piggyback chip. This is mainly used during a development phase or for small series, for which a mask programming is not economical.
• Piggyback is the Mitfluggelegenheit a payload on a satellite or a launch vehicle (secondary payload ). A standard for this is the CubeSat.
• The Guitar Amp Fender Bassman model is referred to in the two-part version in stack design as Piggyback.
• For two-way data transfers receipts, which are attached directly to user data, piggybacked acknowledgments are called.