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2. Air-line fitting - Wikipedia

   en.wikipedia.org/wiki/Air-line_fitting

   Nipples with mating safety couplings. ... A seal is effected using O-rings along the shaft of the nipple or by compression by the tip. ... US Industrial 1/4" 5.3/5.5 ...

3. Quick coupler - Wikipedia

   en.wikipedia.org/wiki/Quick_coupler

   There are many variations in the design of quick couplers. The initial divergence is between those that can pick up any of a range of buckets and attachments by clamping onto the mounting pins for the attachment (known as "pin grabbers" or "pin couplers") and those that work only with buckets and attachments designed to suit that quick coupler (known as "dedicated").

4. Four-bar linkage - Wikipedia

   en.wikipedia.org/wiki/Four-bar_linkage

   The cases of T 1 = 0, T 2 = 0, and T 3 = 0 are interesting because the linkages fold. If we distinguish folding quadrilateral linkage, then there are 27 different cases. [3] The figure shows examples of the various cases for a planar quadrilateral linkage. [4] Types of four-bar linkages, s: shortest link, l: longest link.

5. Coupling - Wikipedia

   en.wikipedia.org/wiki/Coupling

   A grid coupling is composed of two shaft hubs, a metallic grid spring, and a split cover kit. Torque is transmitted between the two coupling shaft hubs through the metallic grid spring element. Like metallic gear and disc couplings, grid couplings have a high torque density. A benefit of grid couplings, over either gear or disc couplings, is ...

6. Piping and plumbing fitting - Wikipedia

   en.wikipedia.org/wiki/Piping_and_plumbing_fitting

   A union also connects two pipes but is quite different from a coupling, as it allows future disconnection of the pipes for maintenance. In contrast to a coupling requiring solvent welding, soldering, or rotation (for threaded couplings), a union allows easy connection and disconnection multiple times if needed. It consists of three parts: a nut ...

7. C-clamp (stagecraft) - Wikipedia

   en.wikipedia.org/wiki/C-Clamp_(stagecraft)

   Spigot: a machined metal shaft that sits in the clamp and rotates freely through 360°. Used for attaching Stage lighting instrument or other fixture to the c-clamp. Pan Bolt: A small bolt through the side of the clamp, typically 1/4" or 3/8" which tightens down onto the spigot, preventing it from rotating (panning).