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Grease fitting on a bearing A grease nipple on the driver's door of a 1956 VW Beetle. A grease fitting, grease nipple, Zerk fitting, grease zerk, Alemite fitting, or divit is a metal fitting used in mechanical systems to feed lubricants, usually lubricating grease, into a bearing under moderate to high pressure using a grease gun.
This edit by 75.131.110.5 removed every mention of the inventor of the grease fitting, Oscar Ulysses Zerk, and the word Zerk. This seems like vandalism. I've put back the fact that Zerk invented it, but the vandal did quite a job and I don't feel up to fixing every removal of "Zerk". Vaughan Pratt 04:59, 26 January 2018 (UTC)
A grease gun (pneumatic) A grease gun is a common workshop and garage tool used for lubrication. The purpose of the grease gun is to apply lubricant through an aperture to a specific point, usually from a grease cartridge to a grease fitting or 'nipple'. The channels behind the grease nipple lead to where the lubrication is needed.
With gooseneck couplers or offset shank couplers, the horizontal centerline of the coupler head is above the horizontal centerline of the coupler shank, or shaft, and the draw gear. This arrangement is designed for use with low-floor freight cars , to lift the coupler head high enough to match the couplers on other rolling stock. [ 18 ]
Two or more passenger or freight cars may be attached by means of a drawbar rather than a coupler. At each end of the permanently coupled vehicles there is a regular coupler, such as the North American Janney coupler or the Russian SA3 coupler. The use of a drawbar eliminates slack action.
In Germany all freight wagon have been built with a UIC automatic coupler option since 1976. [1] This mounting option can be used to deploy the C-Akv coupler when a conversion is implemented. A further advantage in such a scenario is, that the C-Akv coupler can also function like the hook and air connectors for a hook-and-chain coupler, ad long ...
In railroading, slack action is the amount of free movement of one car before it transmits its motion to an adjoining coupled car. This free movement results from the fact that in railroad practice cars are loosely coupled, and the coupling is often combined with a shock-absorbing device, a "draft gear", which, under stress, substantially increases the free movement as the train is started or ...