Slip joint

A slip joint is a mechanical construction allowing extension and compression in a linear structure.

General forms

Slip joints can be designed to allow continuous relative motion of two components or it can allow an adjustment from one temporarily fixed position to another. Examples of the latter are tripods, hiking poles, or similar telescoping device. The position is fixed using a clamping mechanism based on a cam, a set screw or similar locking mechanism. Slip joints can also be non-telescoping, such as the joints on some older wooden surveyor's levelling rods. These use a joint that keeps the sections offset from each other but able to be slid together for transport.

Examples of continuous slip joints are given below.

pecial purpose slip joints

Civil Engineering

Slip joints in large structures are used to allow independent motion of large components while enabling them to be joined in some way. For example, if two tall buildings are to be joined with a pedestrian skyway at some high level, there are two options in structural engineering. If the buildings are identical in mass and elasticity they will tend to respond similarly to ground motion induced by earthquakes. In this case it may be appropriate to construct a rigid connection between the buildings, although this may require additional supporting members within the structures. On the other hand, a lower cost connection may be made by using a lightweight structure that is not coupled rigidly but instead which is allowed to slide or "float" relative to one or both structures. This is especially suitable where the two structures may respond differently to ground motion. The structure will not be completely free to move but rather may use elastic materials to locate it near the center of its range of motion and viscous shock absorbers to absorb energy and to restrict the speed of relative motion. When a sliding connection is used it is extremely important that there be sufficient range of motion without failure to accommodate the maximum credible relative motion of the structures. Additional "fail safe" flexible connections may be added to ensure that the structure does not fall, although it may be damaged to a point of being unservicable or unrepairable

Slip joints are common under conditions where temperature changes can cause expansion and contraction that may overstress a structure. These are generally referred to as "expansion joints." Bridges and overpasses frequently have sliding joints that allow a deck to move relative to piers or abutments. The joints can be constructed with elastomeric pads that permit motion or can use rollers on flat surfaces to allow the ends to move smoothly. The exact details are limited by the imagination of the designer.

Mechanical Engineering

Slip joints are sometimes found in tubular structures such as piping, but are generally avoided for this application due to requirements for sealing against leakage, instead using either a large loop that is allowed to flex or a semi-rigid bellows. Pipe supports often are slip joints to allow for the thermal expansion or contraction or the pipe relative to the support.

ee also

*Slip critical joint
*Expansion joint


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Look at other dictionaries:

  • slip joint — [1] A joint that will transfer driving torque from one shaft to another while allowing longitudinal movement between the two shafts. A variable length connection that permits the driveshaft or axle shaft to change its length as the shaft moves up …   Dictionary of automotive terms

  • slip joint — noun Etymology: slip (III) 1. a. : a telescopic joint between two parts (as a piece of tubing and packing material in a stuffing box) that permits the parts to move in a lengthwise direction b. : a joint formed by slipping one part over another… …   Useful english dictionary

  • slip joint — a joint made between an older and a newer masonry wall to form a continuous surface, masonry at the end of the newer wall fitting into a vertical groove cut in the end of the older wall. [1875 80] * * * …   Universalium

  • slip-joint pliers — n. pliers with a joint adjustable to two positions in order to increase the opening of the jaws. [WordNet 1.5] …   The Collaborative International Dictionary of English

  • slip-joint pliers — slip′ joint pli ers n. (used with a sing. or pl. v.) bui pliers having a sliding joint, permitting the span of the jaws to be adjusted …   From formal English to slang

  • Slip joint pliers — Common, two position straight slip joint pliers Slip joint pliers are pliers whose pivot point or fulcrum can be moved to increase the size range of their jaws. Most slip joint pliers use a mechanism that allows sliding the pivot point into one… …   Wikipedia

  • slip joint pliers — See half moon slip joint pliers …   Dictionary of automotive terms

  • slip-joint pliers — /slip joynt /, (sometimes used with a sing. v.) pliers having a sliding joint, permitting the span of the jaws to be adjusted. See illus. under plier. * * * …   Universalium

  • slip-joint pliers — noun pliers with a joint adjustable to two positions in order to increase the opening of the jaws • Usage Domain: ↑plural, ↑plural form • Hypernyms: ↑pliers, ↑pair of pliers, ↑plyers …   Useful english dictionary

  • half-moon slip joint pliers — A multiple slip joint pliers with groove joint …   Dictionary of automotive terms


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